CN114967313A - Display device, sound-emitting substrate, and projection screen - Google Patents

Abstract

The invention relates to a display device, a sound production substrate and a projection screen, and belongs to the technical field of flat panel display. The display device includes: a projection screen and a signal providing assembly; the projection screen includes: optical film, exciter group and sound production base plate, the sound production base plate includes: a honeycomb layer having a plurality of honeycomb cells, the honeycomb cells having a rigidity in a first direction greater than a rigidity in a second direction of the honeycomb cells; the optical diaphragm is arranged on one side of the sounding substrate, the exciter group is arranged on the other side of the sounding substrate, and the exciter group is used for transmitting vibration to the sounding substrate through the vibration output end so as to excite the sounding substrate to vibrate. The invention is used for image display of audiovisual playback.

Description

Display device, sound substrate, and projection screen

The scheme is based on a divisional application with the application date of 2019, 6, 17 and the application number of 201910523769.4 and the name of 'a display device, a sound production substrate and a projection screen'.

Technical Field

The invention relates to the technical field of flat panel display, in particular to a display device, a sound production substrate and a projection screen.

Background

With the development of flat panel display technology, display terminals such as laser televisions and projectors are configured with increasingly thinner and lighter projection screens. Because the projection screen is thin, it is generally not possible to mount speakers on the projection screen for audio playback.

The current projection screen generally includes a sound-emitting substrate and an exciter (also called a transducer) disposed on the sound-emitting substrate, where the exciter is capable of converting audio current into mechanical vibration under the driving of the audio current, and exciting the sound-emitting substrate to generate multi-modal vibration to form a DML (DML), which is also called bending vibration, and push air to generate sound, thereby playing audio.

However, the DML formed on the sound substrate generates modal resonance at different positions of the substrate, and when the modal resonance occurs, the vibration amplitudes of the antinodes of the resonance distributed at different positions are equal, so that the air volumes pushed by different positions of the sound substrate are equal, and the sound sizes are equal, therefore, the sound emitted from the left side and the right side of the projection screen cannot be distinguished, the left channel and the right channel of the projection screen cannot be distinguished, and the positioning of the sound is affected.

Disclosure of Invention

The invention provides a display device, a sounding substrate and a projection screen, which can solve the problem that the positioning of sound is influenced because a left sound channel and a right sound channel of the projection screen cannot be distinguished in the related technology. The technical scheme is as follows:

in a first aspect, there is provided a display device, comprising: the device comprises a projection screen and a signal providing component, wherein the signal providing component is used for providing audio current for the projection screen and projecting an image corresponding to the audio current to the projection screen;

the projection screen includes: the acoustic control device comprises an optical diaphragm, an exciter group and a sound production substrate;

the sound emission substrate includes: a honeycomb layer having a plurality of honeycomb holes, a depth direction of the honeycomb holes being parallel to a thickness direction of the honeycomb layer, rigidity of the honeycomb holes in a first direction being greater than rigidity of the honeycomb holes in a second direction; the optical diaphragm sets up one side of sound production base plate, exciter group sets up the opposite side of sound production base plate, exciter group is used for transmitting the vibration through the vibration output extremely sound production base plate, in order to encourage sound production base plate to take place the vibration.

In a second aspect, there is provided a sound emitting substrate comprising: the honeycomb structure comprises a honeycomb layer and skins arranged on two sides of the honeycomb layer;

the honeycomb layer is provided with a plurality of honeycomb holes, the depth direction of the honeycomb holes is parallel to the thickness direction of the honeycomb layer, and the rigidity of the honeycomb holes in a first direction is greater than that of the honeycomb holes in a second direction;

the skin is made of unidirectional fibers, and the extending direction of the unidirectional fibers is the first direction; or the skin is made of interwoven fibers formed by interweaving unidirectional fibers with different extending directions, and in the interwoven fibers, the number of the unidirectional fibers with the extending direction in the first direction is greater than that of the unidirectional fibers with the extending direction in the second direction.

In a third aspect, there is provided a projection screen comprising: an optical diaphragm, an actuator group and the sound production substrate of the second aspect, wherein the actuator group comprises at least one actuator;

the optical diaphragm is arranged on one side of the sounding substrate, the exciter group is arranged on the other side of the sounding substrate, and the vibration output end of the exciter is in contact with the sounding substrate;

the exciter is used for transmitting vibration to the sounding substrate through the vibration output end so as to excite the sounding substrate to vibrate.

The technical scheme provided by the invention can have the following beneficial effects:

according to the display device, the sound production substrate and the projection screen provided by the embodiment of the invention, the projection screen of the display device comprises the sound production substrate and the exciter group, and in the honeycomb layer of the sound production substrate, the rigidity of the honeycomb holes in the first direction is greater than that of the honeycomb holes in the second direction, so that when the exciter excites the sound production substrate to generate vibration, the attenuation degree of the vibration in the first direction is less than that in the second direction in the process of conducting the vibration in the sound production substrate, and the vibration amplitude of different position points of the sound production substrate in the second direction is equal, so that the difference of sound intensity cannot be distinguished, and the vibration is mutually superposed and influenced, therefore, the left sound channel and the right sound channel of the projection screen cannot be distinguished, and the influence on sound positioning is avoided. Because the sounding substrate can vibrate to sound under the excitation of the exciter, a loudspeaker does not need to be arranged on the projection screen, the volume of the projection screen is reduced, and the synchronous audio-visual effect of sound and picture in the same direction as the image is met.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.

FIG. 1 is a schematic diagram of a display device according to the present invention;

fig. 2 is a schematic front view of a sound substrate according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structural diagram of a honeycomb layer according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a sound substrate according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a sound substrate according to an embodiment of the present invention;

fig. 6 is a schematic front view of another sound substrate according to an embodiment of the present invention;

fig. 7 is a schematic front view of a sounding substrate according to another embodiment of the present invention;

fig. 8 is a schematic front view of another sound substrate according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a projection screen according to an embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view of the projection screen of FIG. 9 taken along line S0-S0 according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another projection screen according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a projection screen according to another embodiment of the present invention;

FIG. 13 is a schematic cross-sectional view of the projection screen of FIG. 9 taken along line S0-S0 in accordance with an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a position stabilizer according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of another position stabilizer provided in accordance with an embodiment of the present invention;

fig. 16 is a schematic rear view of a projection screen according to an embodiment of the present invention;

FIG. 17 is a schematic cross-sectional view of the projection screen of FIG. 16 taken along line S1-S1 according to an embodiment of the present invention;

FIG. 18 is a schematic cross-sectional view of the projection screen of FIG. 16 taken along line S2-S2 in accordance with an embodiment of the present invention;

FIG. 19 is a schematic cross-sectional view of the projection screen of FIG. 16 taken along line S3-S3 in accordance with an embodiment of the present invention;

fig. 20 is a schematic cross-sectional view of the projection screen shown in fig. 16 along the line S4-S4 according to an embodiment of the present invention.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With the development of flat panel display technology, display terminals such as laser televisions and projectors are configured with increasingly thinner and lighter projection screens. Because the projection screen is thin, it is generally impossible to mount speakers on the projection screen for audio playback. In order to realize the function of playing audio by the projection Screen, a flat panel sound emission technology has been derived, and the projection Screen sound emission technology similar to the flat panel sound emission technology is also called as an Excited sounding Screen (EVS) technology. The screen sounding of the EVS technology has the characteristics of micron-scale amplitude, small distortion and good transient response, so that the audio played by the technology has high definition, good strength and space depth. A projection screen using flat panel sound production technology can be regarded as a large-area stereo DML flat panel sound.

Referring to fig. 1, a schematic structural diagram of a display device according to the present invention is shown. The display device includes: the projection screen 01 and the signal providing component 02, the signal providing component 02 may be configured to provide an audio current to the projection screen 01 and project an image corresponding to the audio current to the projection screen 01. By way of example, the signal providing component 02 may be a laser television box. The projection screen 01 generally includes a sound substrate and an exciter disposed on the sound substrate, the exciter can receive the audio current from the signal providing assembly 02, generate mechanical vibration according to the audio current, excite the sound substrate to form a DML, and push air to generate sound (the waveform of the sound is a bending wave), so that the projection screen 01 can realize audio playing. However, the DML generates modal resonance at different positions of the sound substrate, and when the modal resonance occurs, the vibration amplitudes of the antinodes of the resonance distributed at different positions are equal, so that the air volumes pushed by different positions of the sound substrate are equal, and the sound magnitudes are the same, therefore, the left and right channels of the projection screen cannot be distinguished, and the positioning of the sound is affected.

The embodiment of the invention provides a display device, wherein a sounding substrate of the display device comprises a honeycomb layer with a plurality of honeycomb holes, the honeycomb holes have different rigidities in different directions, and in the same way, the honeycomb holes have different compliance (namely flexibility) in different directions, so that after the sounding substrate vibrates, the damping degrees in different directions are different in the process of conducting the vibration in the sounding substrate, so that the vibration amplitudes in different directions are different (namely, the sounding substrate has anisotropic mechanical response characteristics), and the sound generated by the sounding substrate in different directions is different in size. Therefore, the sound production range of the sound production substrate can be controlled, so that the sound produced by the left side and the right side of the projection screen can be distinguished, the left sound channel and the right sound channel of the projection screen are distinguished, and the influence on sound positioning is avoided. The present invention is described in detail with reference to the following examples.

Referring to fig. 2, fig. 2 is a schematic front view illustrating a sound substrate 1 according to an embodiment of the present invention, and as shown in fig. 2, the sound substrate 1 includes: a honeycomb layer 11, the honeycomb layer 11 having a plurality of honeycomb holes 111. Fig. 3 shows a schematic cross-sectional structure of a honeycomb layer 11 provided in an embodiment of the present invention, and referring to fig. 2 and 3, a depth direction z of a honeycomb cell 111 is parallel to a thickness direction (not labeled in fig. 2 and 3) of the honeycomb layer 11, a rigidity (also called strength) of the honeycomb cell 111 in a first direction y is greater than a rigidity (also called strength) of the honeycomb cell 111 in a second direction x, and similarly, a compliance (i.e. flexibility) of the honeycomb cell 111 in the first direction y is less than a compliance (i.e. flexibility) of the honeycomb cell 111 in the second direction x. Wherein the first direction y and the second direction x are perpendicular to the depth direction of the honeycomb holes 111, and the first direction y is different from the second direction x, illustratively, the first direction y is perpendicular to the second direction x, and the sounding substrate is an orthotropic mechanical structure having orthotropic conductive properties.

In which the sound emission substrate 1 has at least two vibration regions (two are shown in fig. 2). Each vibration region may have an excitation point (the point where the exciter contacts the sound emitting substrate is the excitation point). The modal resonance generated by the sound substrate (the vibration is bending wave vibration) is conducted from the excitation point to the surroundings.

For example, as shown in fig. 2, when the plate surface of the sound substrate is rectangular, the first direction y may be perpendicular to the long side of the rectangle, and the second direction x may be parallel to the long side of the rectangle. Here, the sound substrate 1 may have two vibration regions, that is, the first vibration region a1 and the second vibration region a2, which are arranged in the second direction x, and the two vibration regions may be regions near both ends of the sound substrate, and the first vibration region a1 may have the first excitation point a1 and the second vibration region a2 may have the second excitation point a 2.

As will be readily appreciated by those skilled in the art, in the embodiment of the present invention, as shown in fig. 4, which illustrates a schematic diagram of the sound emitting substrate provided by the embodiment of the present invention, the degree of attenuation of the vibration in the material with larger compliance is greater than that in the material with smaller compliance. Since the rigidity of the cell 111 in the first direction y is greater than the rigidity of the cell 111 in the second direction x, the compliance of the cell 111 in the first direction y is less than the compliance of the cell 111 in the second direction x, so that the degree of attenuation in the first direction y is less than the degree of attenuation in the second direction x during the conduction of the vibration in the cell layer. In fig. 4, it is assumed that the dashed line y1 represents that the vibration is conducted in the first direction y without attenuation, that is, the excitation response (referring to the intensity of the vibration conducted from the excitation point a to the periphery) of the honeycomb layer is 100%. It is assumed that the straight line of the dashed line x1 represents the undamped conduction of vibration in the second direction x, i.e. the excitation response of the honeycomb layer is 100%. The solid line y2 represents the actual excitation response of the vibration in the first direction y, and the distance between any point on the solid line y2 and the corresponding point on the broken line y1 is the attenuation degree (i.e. the reduction degree of the vibration amplitude of the bending wave) of the vibration at any point. The solid line x2 represents the actual excitation response of the vibration in the second direction x, and the distance (e.g., Δ x) between any point on the solid line x2 and the corresponding point on the dashed line x1 is the attenuation of the vibration at any point. As an example, as can be seen from fig. 4, the vibration conducted from the excitation point a to the periphery is attenuated by a much smaller degree in the first direction y than the vibration in the second direction x, and the vibration can be considered to be conducted to the entire screen width in the first direction y without attenuation. In the second direction x, the vibration is attenuated to an increasing extent in the direction x3 with the excitation point a as the origin, and the attenuation to the direction x4 is also increased, so that the energy transmission of the vibration generates a significant energy gradient in the second direction x. It is possible to facilitate control of the vibration range of the honeycomb layer, thereby localizing sound generated based on vibration.

Based on the principle of the above-described sound emission substrate, it can be understood that, with the sound emission substrate 1 as shown in fig. 2, when the vibration generated from the first excitation point a1 is conducted toward the second vibration region a2 in the second direction x, the more it is conducted in the negative x direction, the greater the attenuation of the vibration amplitude (i.e., the energy of the vibration), the vibration is prevented from having the same vibration amplitude in first vibration region a1 and second vibration region a2, so that the vibration intensities of first vibration region a1 and second vibration region a2 are different, so that the intensity of the sound generated from the first vibration region a1 is different from the intensity of the sound generated from the second vibration region a2, and since the vibration intensity of the vibration is large in the first vibration region a1, the sound generated based on the vibration is mainly concentrated on the first vibration region a1, that is, when the first excitation point a1 generates vibration, the sound sensation can be almost all considered to come from the first vibration region a 1.

Similarly, when the vibration generated by the second excitation point a2 is transmitted to the first vibration region a1 in the second direction x, the more it is transmitted to the positive direction x, the greater the attenuation of the vibration amplitude is, the vibration amplitude is prevented from being the same in the second vibration region a2 and the first vibration region a1, the vibration intensity of the first vibration region a1 is different from that of the second vibration region a2, the sound intensity generated by the first vibration region a1 is different from that generated by the second vibration region a2, and the sound generated by the vibration is mainly concentrated in the second vibration region a2 because the vibration intensity of the vibration is large in the second vibration region a2, that is, when the vibration is generated by the second excitation point a2, the sound auditory sensation can be almost considered to be from the second vibration region a 2.

In this way, it is possible to facilitate control of the range of vibrations generated by different excitation points of the sound-emitting substrate 1, thereby localizing the sound generated based on the vibrations.

In summary, in the sounding substrate provided in the embodiments of the present invention, in the honeycomb layer of the sounding substrate, the rigidity of the cell holes in the first direction is greater than the rigidity of the cell holes in the second direction, so that when the sounding substrate vibrates, in the process of conducting the vibration on the sounding substrate, the attenuation degree of the vibration in the first direction is less than the attenuation degree of the vibration in the second direction, and while the maximum vibration propagation range is obtained in the first direction, it is avoided that the vibration amplitudes of different position points of the sounding substrate in the second direction are equal, so that the sound intensity difference cannot be distinguished, and the vibrations are mutually superimposed and influenced, thereby reducing the influence on sound positioning.

Alternatively, as shown in fig. 2 and 3, the open shape of the honeycomb holes 111 is a convex hexagon. The convex hexagon has two parallel sides with equal length, and has a first symmetry axis L1 and a second symmetry axis L2, the first symmetry axis L1 and the two parallel sides are parallel to the first direction y, the second symmetry axis L2 is parallel to the second direction x, and the first symmetry axis L1 is perpendicular to the second symmetry axis L2. The stretching ratio of the convex hexagon ranges from 0.3 to 0.7, as shown in fig. 3, the stretching ratio is a ratio of a first distance D to a second distance L, the first distance D is a distance between the two parallel sides of the convex hexagon cell hole, the first distance can range from 3 to 10mm (millimeter), for example, the first distance can be 3mm, 6mm or 10mm, the second distance L is a sum of a length of a first diagonal line of the convex hexagon and a length of any one of the two parallel sides of the convex hexagon, the first diagonal line of the convex hexagon is parallel to a first symmetry axis L1 of the convex hexagon, and the second distance L can also be referred to as a cell vertex angle length. Illustratively, the convex hexagons have a stretch ratio of 0.3, 0.32, or 0.7. The range of the stretch ratio of the opening shape (i.e., the convex hexagon) of the honeycomb holes 111 is 0.3 to 0.7, and the rigidity of the honeycomb holes 111 in the first direction y can be ensured to be greater than the rigidity of the honeycomb holes 111 in the second direction x. The material of the honeycomb layer 11 in the embodiment of the present invention may be paper, aramid, metal or composite material.

Further, as shown in fig. 5, fig. 5 is a schematic cross-sectional structural diagram of a sound substrate 1 according to an embodiment of the present invention, please refer to fig. 5, where the sound substrate 1 further includes: the skin 12 is arranged on two sides of the honeycomb layer 11, and the rigidity of the skin 12 in the first direction y is greater than that of the skin 12 in the second direction x, namely the compliance of the skin 12 in the first direction y is smaller than that of the skin 12 in the second direction x. In this way, because the skins 12 are arranged on both sides of the honeycomb layer 11, and the direction with the larger rigidity on the skins 12 and the direction with the larger rigidity on the honeycomb layer 11 are both the first direction, the rigidity of the sound substrate in the first direction is increased, so that when the sound substrate vibrates, the damping degree of the vibration in the first direction is smaller than that in the second direction, and the anisotropic conduction performance of the sound substrate is enhanced.

Wherein, the thickness range of the covering 12 can be 0.1-0.5 mm. By way of example, the skin 12 may have a thickness of 0.1mm, 0.25mm, or 0.5 mm. The material of the skin 12 may be unidirectional fibers or interwoven fibers formed by interweaving unidirectional fibers extending in different directions. Both the unidirectional fibers and the interwoven fibers include, but are not limited to, glass fibers, carbon fibers, glass-carbon hybrid fibers, plastic fibers, aluminum skins, and the like. When the material of the skin 12 is a unidirectional fiber, the extending direction of the unidirectional fiber is the first direction y, so that the rigidity of the skin 12 in the first direction y is greater than the rigidity of the skin 12 in the second direction x. When the material of the skin 12 is interwoven fibers, the number of unidirectional fibers extending in the first direction y is greater than the number of unidirectional fibers extending in the second direction x in the interwoven fibers, so that the rigidity of the skin 12 in the first direction y is greater than the rigidity of the skin 12 in the second direction x.

Optionally, as shown in fig. 6, which shows a schematic front view structure diagram of another sound substrate 1 provided in an embodiment of the present invention, please refer to fig. 6, where the sound substrate 1 may have a plurality of vibration regions (only two are shown in fig. 6) and an isolation region b located between every two adjacent vibration regions, and the isolation region b may block vibration conduction between the vibration regions, further avoid mutual vibration conduction between the vibration regions, and facilitate controlling a sound emission range of the sound substrate.

In the embodiment of the present invention, the isolation region may have a plurality of possible implementation manners, and the isolation region is described in the embodiment of the present invention by taking the following three implementation manners as examples.

The first implementation mode comprises the following steps: the sounding substrate of the isolation region is of a low-rigidity anisotropic mechanical structure compared with the vibration region, the stretch ratio of the honeycomb holes in the isolation region is smaller than that of the honeycomb holes in the vibration region, so that the rigidity of the isolation region in the second direction is smaller than that of the vibration region in the second direction, the compliance of the isolation region in the second direction is larger than that of the vibration region in the second direction, and the isolation region has larger compliance in the second direction. Alternatively, as shown in fig. 6, the tensile ratio of the honeycomb holes in the vibration region may range from 0.3 to 0.7, and the tensile ratio of the honeycomb holes in the isolation region b is smaller than that of the honeycomb holes in the vibration region. For example, the tensile ratio of the honeycomb holes in the vibration region may be 0.4, and the tensile ratio of the honeycomb holes in the isolation region b may be 0.3. Alternatively, the cell holes in the vibration region may have a stretching ratio of 0.58, and the cell holes in the isolation region b may have a stretching ratio of 0.5. If the change of the second distances of the honeycomb holes in the vibration area and the isolation area b is neglected, the first distance of the honeycomb holes in the isolation area b is smaller than the first distance of the honeycomb holes in the vibration area; ignoring the variation of the first distance of the cells in the vibrating region and in isolation region b, the second distance of the cells in isolation region b is greater than the second distance of the cells in the vibrating region.

In the embodiment of the invention, because the compliance of the isolation region in the second direction is greater than that of the vibration region in the second direction, the attenuation degree of the vibration in the second direction when the vibration is conducted in the isolation region is greater than that of the vibration region when the vibration is conducted in the second direction, so that the vibration is more attenuated when passing through the isolation region, and the isolation region can increase the blocking effect on the vibration conduction between the vibration regions.

The second implementation mode comprises the following steps: in the sounding substrate, the sound-absorbing material with a certain width is filled in the honeycomb holes at the specific position of the sounding substrate to form the strip-shaped separation area according to the sounding requirement of the sounding substrate so as to separate the sounding area of the sounding substrate. The specific position refers to a position on the sound emission substrate where conduction of sound vibration needs to be blocked. For example, the sound absorbing material may be filled in the honeycomb holes in the isolation region, so that the isolation region can absorb the sound generated by the vibration conducted to the isolation region by absorbing the vibration conducted to the isolation region by the sound-emitting substrate. Alternatively, as shown in fig. 7, which shows a schematic front view of another sound-emitting substrate 1 provided by the embodiment of the present invention, the honeycomb holes in the isolation region b are filled with a sound-absorbing material (not shown in fig. 7) to form a strip-shaped partition, and the sound-absorbing material may be a foam damping sound-absorbing material. In the sound emission substrate 1 shown in fig. 7, the cell holes 111 in the vibration region and the cell holes 111 in the isolation region b may be equal to each other in terms of the stretch ratio. For example, the stretch ratios of the honeycomb holes 111 in the vibration region and the isolation region b may each range from 0.3 to 0.7.

In the embodiment of the present invention, since the sound-absorbing material in the isolation region can absorb the sound generated by the vibration conducted to the isolation region by absorbing the vibration conducted to the isolation region, the conduction of the sound between the vibration regions can be blocked.

The third implementation mode comprises the following steps: on the basis of fig. 6, the honeycomb holes in the isolation region b may be filled with sound absorbing material. Therefore, the tensile ratio of the honeycomb holes in the isolation area is smaller than that of the honeycomb holes in the vibration area, and the isolation area is filled with the sound-absorbing material, so that the isolation area can more effectively block vibration conduction between the vibration areas.

Optionally, the shape, number, and position of the isolation region in the sound substrate may be set according to an actual sound requirement (for example, a requirement that a sound channel of a projection screen to which the sound substrate belongs is not interfered), and the shape, number, and position of the isolation region are described in the following two possible implementation manners in the embodiment of the present invention.

The first implementation mode comprises the following steps: with continued reference to fig. 6 and 7, the surface and the isolation area b of the sound substrate 1 are rectangular, the sound substrate 1 may include an isolation area b, and two vibration areas a including a first vibration area a1 and a second vibration area a2 sequentially arranged along the second direction x, the first vibration area a1 has a first excitation point a1, and the second vibration area a2 has a second excitation point a 2. Two symmetry axes of the face of the sounding substrate 1 are the same as those of the isolation region b, the long edge of the isolation region b is equal to the short edge of the face of the sounding substrate 1, and the short edge of the isolation region b is collinear with the long edge of the face of the sounding substrate 1. Illustratively, the isolation region b is an elongated region parallel to the first direction and extending through the entire sound substrate.

When the vibration generated by the first excitation point a1 is conducted to the isolation region b, the vibration is more attenuated in the second direction x during the conduction process of the isolation region b, so that the vibration is more attenuated when passing through the isolation region, the conduction of the vibration to the second vibration region a2 is blocked, and therefore the second vibration region a2 and the first vibration region a1 have the same vibration amplitude, so that the vibration intensities of the first vibration region a1 and the second vibration region a2 are different, and further the sound intensities generated in the first vibration region a1 and the second vibration region a2 are different, and since the vibration intensity of the first vibration region a1 is large, the sound generated based on the vibration is mainly concentrated in the first vibration region a1, that is, when the first excitation point a1 generates the vibration, the auditory sensation can be almost considered to be from the first vibration region a 1. Similarly, when the second excitation point a2 generates vibration, the sound sensation can be almost all considered to come from the second vibration region a 2. The range of vibration generated by different excitation points of the sounding substrate 1 is effectively controlled, and the influence on sound positioning is more effectively reduced.

The second implementation mode comprises the following steps: fig. 8 is a schematic front view illustrating a sound substrate 1 according to another embodiment of the present invention. The surface of the sound substrate 1 is rectangular, the sound substrate 1 may include two isolation regions, namely a first isolation region b1 and a second isolation region b2, and three vibration regions, namely a first vibration region a1, a third vibration region A3 and a second vibration region a2, which are sequentially arranged along the second direction x, wherein the first vibration region a1 has a first excitation point a1, the second vibration region a2 has a second excitation point a2, and the third vibration region A3 has a third excitation point A3. The figure that two isolation regions are connected and are formed is the V font, and the opening place straight line of V font is on the same line with a long limit of the face of sound production base plate 1, and the summit of V font is located another long edge of the face of sound production base plate 1, and the isolation region is symmetrical about first symmetry axis L3 of the face of sound production base plate 1, and first symmetry axis L3 of the face of sound production base plate 1 is on a parallel with the minor face of the face of sound production base plate 1. The first axis of symmetry L3 of the plate surface of the sound substrate 1 is parallel to the first axis of symmetry L1 of the convex hexagon.

Like the first and second vibration regions in the first implementation described above, when the first excitation point a1 shown in fig. 8 generates vibration, the sound sensation can be almost all considered to come from the first vibration region a 1. When the second excitation point a2 shown in fig. 8 generates vibration, the sound sensation can be almost all considered to come from the second vibration region a 2.

When the vibration generated by the third excitation point a3 shown in fig. 8 is conducted to the first isolation region b1 in the second direction x, the vibration is more attenuated in the second direction x during the conduction of the first isolation region b1, so that the vibration is more attenuated when passing through the first isolation region b1, blocking the conduction of the vibration to the first vibration region a 1. Meanwhile, when the vibration is conducted to the second isolation region b2 in the second direction x, the vibration is more attenuated in the second direction x during the conduction of the second isolation region b2, so that the vibration is more attenuated while passing through the second isolation region b2, blocking the conduction of the vibration to the second vibration region a 2. Therefore, it is more effectively avoided that the vibrations have the same vibration amplitude in first vibration region a1, second vibration region a2, and third vibration region a3, so that the vibration intensities of first vibration region a1, second vibration region a2, and third vibration region a3 are all different, and further, the sound intensities generated in first vibration region a1, second vibration region a2, and third vibration region a3 are all different, and since the vibration intensity of the vibrations is large in third vibration region a3, the sound generated based on the vibrations is mainly concentrated in third vibration region a3, and the sound auditory sensation can be almost all considered to be from third vibration region a 3. The range of vibration generated by different excitation points of the sounding substrate 1 is effectively controlled, and the influence on sound positioning is more effectively reduced.

In summary, in the sounding substrate provided in the embodiments of the present invention, in the honeycomb layer of the sounding substrate, the rigidity of the honeycomb holes in the first direction is greater than the rigidity of the honeycomb holes in the second direction, so that when the sounding substrate vibrates, in the process of conducting the vibration on the sounding substrate, the attenuation degree of the vibration in the first direction is smaller than the attenuation degree of the vibration in the second direction, and while the maximum vibration propagation range is obtained in the first direction, it is avoided that the vibration amplitudes of different position points of the sounding substrate in the second direction are equal, so that the difference of sound intensities cannot be distinguished, and the vibrations are mutually superimposed and influenced, thereby reducing the influence on sound localization.

Referring to fig. 9 and 10, fig. 9 is a schematic structural diagram of a projection screen according to an embodiment of the present invention, and fig. 10 is a schematic cross-sectional structural diagram of the projection screen shown in fig. 9 along a line S0-S0 according to an embodiment of the present invention. As shown in fig. 9 and 10, the projection screen includes: a sound substrate 1, an optical diaphragm 2 and actuator groups 3 (only two are shown in fig. 9), the sound substrate 1 may be the sound substrate 1 provided in the above embodiment, and each actuator group 3 includes at least one actuator 31.

The optical diaphragm 2 is arranged on one side of the sounding substrate 1, the exciter group 3 is arranged on the other side of the sounding substrate 1, and a vibration output end (also called an actuating output end) of the exciter 31 is in contact with the sounding substrate 1. The exciter 31 is used to transmit vibration to the sound emission substrate 1 through the vibration output end to excite the sound emission substrate 1 to vibrate, thereby emitting sound (e.g., stereo sound). Wherein, the exciter group 3 can be arranged in the vibration area corresponding area of the sounding substrate 1.

In the embodiment of the invention, the rigidity of the sounding substrate in the first direction y is greater than that of the honeycomb holes 111 in the second direction x, and the compliance in the first direction y is smaller than that of the honeycomb holes 111 in the second direction x. The first direction may be perpendicular to a line connecting the left channel and the right channel of the projection screen, and the second direction may be parallel to the line connecting the left channel and the right channel of the projection screen.

In summary, according to the projection screen provided in the embodiment of the present invention, because the projection screen includes the sound-emitting substrate and the exciter group, in the honeycomb layer of the sound-emitting substrate, the rigidity of the honeycomb holes in the first direction is greater than the rigidity of the honeycomb holes in the second direction, when the exciter excites the sound-emitting substrate to generate vibration, in the process of conducting the vibration in the sound-emitting substrate, the degree of attenuation in the first direction is less than the degree of attenuation in the second direction, so that it can be avoided that the difference in sound intensity and the mutual overlapping influence of the vibration due to the equal vibration amplitudes of different position points of the sound-emitting substrate in the second direction cannot be distinguished, thereby avoiding the inability to distinguish the left channel and the right channel of the projection screen, and avoiding the influence on the positioning of the sound. Because the sounding substrate can generate modal resonance to sound under the excitation of the exciter, a loudspeaker does not need to be installed on the projection screen, the volume of the projection screen is reduced, and the synchronous audio-visual effect of sound and image in the same direction is met.

Alternatively, the optical film 2 may be a display film or a film having a touch function. Alternatively, a display panel may be used instead of the optical film 2 as long as the optical film 2 can perform a display function or a touch function. By way of example, the display film 2 may be a fresnel, a bar grating, or a microlens array, etc., having an optical microstructure. Optionally, the optical film layer 2 may be bonded to the sound substrate 1, as shown in fig. 10, the projection screen may further include an adhesive layer 4, the adhesive layer 4 is disposed between the optical film layer 2 and the sound substrate 1, and the adhesive layer 4 is used for bonding the optical film layer 2 and the sound substrate 1.

In the embodiment of the invention, each exciter group can comprise p exciters, and p is more than or equal to 1. Exemplary 1 ≦ p ≦ 4. The vibration frequency ranges of the p exciters can be different, when the p exciters vibrate simultaneously, the vibrations of the p exciters in different frequency ranges can be superposed with each other, and the exciter group consisting of the p exciters has a wider vibration frequency range to widen the frequency response. The exciter can be an electromagnetic exciter, a piezoelectric exciter or a Magnetostrictive exciter, the electromagnetic exciter can comprise a driving coil pipe, the driving coil pipe can be a vibration output end of the electromagnetic exciter, the piezoelectric exciter is also called a piezoelectric driver, the Magnetostrictive exciter is also called a Magnetostrictive driver, and the Magnetostrictive exciter can be made of Giant Magnetostrictive Material (GMM). The piezoelectric actuator and the magnetostrictive actuator both comprise a driving end, and the driving end can be a vibration output end. When the exciter is an electromagnetic exciter, a driving coil tube of the exciter can be directly contacted with the sounding substrate; when the actuator is a piezoelectric type actuator or a magnetostrictive type actuator, the driving end of the actuator may be brought into direct contact with the sound emission substrate.

In the related art, the braking output end of the exciter is usually connected with the sounding substrate through a transmission member, and the use of the transmission member may result in an increase in the additional mass of the projection screen, which may easily affect the vibration sounding effect of the projection screen. In the embodiment of the invention, the vibration output end of the exciter is directly contacted with the sounding substrate, so that the use of a transmission part can be avoided, the additional mass of the projection screen is reduced, and the vibration sounding effect of the projection screen is improved.

Optionally, with continued reference to fig. 9 and 10, the surface of the sounding substrate 1 is rectangular, the projection screen includes at least two exciter sets, the at least two exciter sets 3 are symmetrical with respect to a first axial cross section e of the sounding substrate 1, the first axial cross section e is parallel to a first side surface d of the sounding substrate 1, and the first side surface d is a smaller side surface of the side surfaces of the sounding substrate 1. Each exciter group 3 comprises at least two exciters 31, and the connecting line of the at least two exciters 31 forms an angle smaller than or equal to 90 degrees with the first axial section e.

Illustratively, taking the case where each actuator group includes two actuators, as shown in fig. 11, each actuator group 3 includes an actuator 31a and an actuator 31 b. The line L4 between exciter 31a and exciter 31b is at an angle (not shown in fig. 11) equal to 0 degrees to the first axial section e. Alternatively, as shown in fig. 12, each of the exciter groups 3 includes an exciter 31a and an exciter 31 b. The line L4 connecting the exciter 31a and the exciter 31b makes an angle with the first axial section e (not shown in fig. 11) smaller than 90 degrees.

As another example, each exciter group includes three exciters. As shown in fig. 9, each of the exciter groups 3 includes three exciters, which may be an exciter 31a, an exciter 31b, and an exciter 31 c. The line L5 between the exciter 31a and the exciter 31b is perpendicular to the first axial section e, and the line L4 between the exciter 31c and the exciter 31b forms an angle (not shown in fig. 9) smaller than 90 degrees with the first axial section e. Alternatively, exciter 31a and exciter 31b may be high frequency exciters and exciter 31c may be low frequency exciters. Thus, the high-frequency exciter is arranged at the upper position on the projection screen and is close to the two ends of the projection screen, so that when the exciter group excites the sound generated by the sound production substrate, the sound field of the sound is wider, and the positioning is better.

Further, fig. 13 is a schematic cross-sectional view of another projection screen shown in fig. 9 along the line S0-S0 according to an embodiment of the present invention. As shown in fig. 13, on the basis of fig. 10, the projection screen further includes: a position stabilizer 5. Fig. 14 shows a schematic structural diagram of a position stabilizer 5 provided by an embodiment of the present invention, and referring to fig. 13 and 14, the position stabilizer 5 includes a stabilizer main body 51, a plurality of legs 52, and a plurality of damping blocks 53. The damping blocks 53 are disposed at one end of the supporting legs 52 in a one-to-one correspondence, the other end of the supporting legs 52 is fixedly connected to the stabilizer body 51, and the supporting legs 52 are distributed on a circumference of a first circle (not shown in fig. 13 and 14) having a center located on an axis of the stabilizer body 51 (not shown in fig. 13 and 14), which may be any circle having a center located on the axis of the stabilizer body 51. The stabilizer body 51 has a first fixing position (not shown in fig. 13) whose axis may be collinear with the axis of the stabilizer body 51, as shown in fig. 13, the vibration output end of the exciter 31 passes through the first fixing position of the stabilizer body 51 to abut against the sound-emitting substrate 1, and the damper block 53 is fixedly connected to the sound-emitting substrate 1.

Illustratively, the stabilizer body 51 has a cylindrical shape, and the legs may be formed in an arc shape and the legs may be sheet-like elastic legs having a low elastic coefficient. The legs 52 may extend circumferentially of the stabilizer body 51 (i.e., extend back and forth away from the center of the stabilizer body 51 as shown in fig. 14), or the legs 52 may extend in a direction away from the axis of the stabilizer body 51 (i.e., the legs may extend radially) as shown in fig. 15. Thus, the position stabilizer 5 can be regarded as a Spider (Spider) structure.

In the embodiment of the present invention, as shown in fig. 13, since the vibration output end of the exciter 31 passes through the first fixing position of the stabilizer body 51 and abuts against the sound substrate 1, and the damping block 53 is fixedly connected to the sound substrate 1, the position stabilizer 5 can keep the exciter 31 and the sound substrate 1 in a relatively stable state, and ensure that the exciter 31 does not axially rotate. Further, the structure of the position stabilizer 5 is such that the position stabilizer has a function of a mechanical low-pass filter (similar to a shock absorber), so that the vibration is transmitted to the leg 52 of the position stabilizer 5 and then filtered, and the vibration of the exciter 31 itself is not affected. If the exciter 31 is an electromagnetic exciter having a driving coil form and a magnetic pole piece, the magnetic pole piece can generate a magnetic field, and the driving coil form can generate a large electromotive force at the center of the magnetic field to drive the coil form to actuate. This position stabilizer 5 can prevent that the drive coil pipe of electromagnetic type exciter deviates from the magnetic field center because of the vibration influence of sound production base plate to guarantee that this electromagnetic type exciter is in best operating condition, and this position stabilizer 5 can guarantee that the electromagnetic type exciter can not produce the axial and turn round the pendulum, thereby reduce the sound distortion of sound production base plate by a wide margin.

Optionally, please refer to fig. 16, which shows a rear view structural diagram of a projection screen according to an embodiment of the present invention. As shown in fig. 16, the projection screen further includes: a fixed assembly 6, the fixed assembly 6 comprising a screen frame 61 and a fixed structure 62. The screen frame 61 is disposed around the sounding substrate 1, and a fixing structure is used to fix the exciter group 3 to the sounding substrate 1.

Alternatively, as shown in fig. 16, the fixing structure 62 includes a first fixing element 62a, as shown in fig. 17, which illustrates a schematic cross-sectional structure of the projection screen shown in fig. 16 along the line S1-S1 according to an embodiment of the present invention. Referring to fig. 16 and 17, the first mount 62a includes: fixed plate 621a and cushion pad 622a, fixed plate 621a sets up the opposite side (i.e. keep away from the one side of optical film piece 2) at sound production substrate 1, and the both ends of fixed plate 621a and screen frame 61 joint, and first exciter sets up between sound production substrate 1 and fixed plate 621a, and cushion pad 621a sets up between first exciter and fixed plate 621a, and first exciter abuts with sound production substrate 1 and cushion pad 621a respectively. Wherein the first exciter means the exciter 31 fixed by the first fixing member 62 a.

Optionally, as shown in fig. 16, the fixing structure 62 further includes a second fixing member 62b, as shown in fig. 18, which is a schematic partial sectional view of the projection screen shown in fig. 16 along the line S2-S2 according to an embodiment of the present invention. Referring to fig. 16 and 18, the second mount 62b includes: the sound insulation member 622b is annular, the sound insulation member 622b is fixedly connected with the rear cover 621b and the sound-emitting substrate 1, at least one second exciter is arranged in the sound insulation member 622b, the rear cover 621b is provided with a second fixing position (not marked in fig. 18), the second exciter is clamped in the second fixing position of the rear cover 621b, and the sealing gasket 623b is arranged between the second fixing position of the rear cover 621b and the second exciter. As an example, the sound-insulating member 622b may be a sound-insulating buffer member, such as a sound-damping spacer, and the material of the sound-insulating buffer member may be an Ethylene Vinyl Acetate (EVA) foam material. Wherein the second exciter refers to the exciter 31 fixed by the second fixing member 62 b. Since the rear cover, the soundproof member and the gasket constitute a closed space surrounding the exciter, the second fixing member 62b not only fixes the second exciter to the sound-emitting substrate, but also insulates sound generated by the actuation of the second exciter to reduce noise.

It should be noted that, in the embodiment of the present invention, each first fixing member 62a may fix one first exciter, or fix a plurality of first exciters at the same time, and each second fixing member 62b may fix one second exciter, or fix a plurality of second exciters at the same time, and the above-mentioned fig. 16 does not limit the number of the exciters fixed by the first fixing member 62a and the second fixing member 62 b. In addition, in the embodiment of the present invention, the fixing assembly 6 of the projection screen includes both the first fixing element 62a and the second fixing element 62b, and in an actual projection screen, the fixing assembly 6 may include only the first fixing element 62a or only the second fixing element 62b, which is not limited in the embodiment of the present invention.

Further, as shown in fig. 16 and 19, fig. 19 is a schematic partial sectional view of the projection screen shown in fig. 16 along the line S3-S3 according to an embodiment of the present invention. The fixing assembly 6 further comprises: a hanger 63 and a shock-absorbing pad (not shown in fig. 16 and 19), the hanger 63 being connected to the screen frame 61, the shock-absorbing pad being disposed at a contact position of the hanger 63 with the screen frame 61 and between the hanger 63 and the screen frame 61, the hanger 63 being for hanging the projection screen. For example, the hanging member 63 may hang the projection screen on a supporting wall (e.g., a wall, etc.) by a screw 7.

Further, as shown in fig. 19, a foaming double-sided adhesive tape 8 is arranged between the screen frame 61 and the sound-emitting substrate 1 and between the screen frame 61 and the optical film 2, the foaming double-sided adhesive tape 8 can be used for bonding the screen frame 61 and the sound-emitting substrate 1 and between the screen frame 61 and the optical film 2, the influence of the vibration of the sound-emitting substrate 1 on the screen frame 61 can be reduced, and the service life of the projection screen is prolonged.

Alternatively, as shown in fig. 20, fig. 20 is a schematic partial sectional view of the projection screen shown in fig. 16 along the line S4-S4, and based on fig. 18, the projection screen further includes: isolation rod 9 and damping structure 10, the both ends and the screen frame 61 fixed connection of isolation rod 9, and the orthographic projection of isolation rod 9 on sound production base plate 1 is located the isolation region (not marked in fig. 20) of sound production base plate 1, and damping structure 10 is located between isolation rod 9 and sound production base plate 1, and just contacts with isolation rod 9 and sound production base plate 1. The damping structure 10 is made of a material having damping characteristics, so that the damping structure can damp the vibration generated from the sound-emitting substrate 1 to control the conduction range of the vibration from the outside of the sound-emitting substrate.

In summary, according to the projection screen provided in the embodiment of the present invention, because the projection screen includes the sound-emitting substrate and the exciter group, in the honeycomb layer of the sound-emitting substrate, the rigidity of the honeycomb holes in the first direction is greater than the rigidity of the honeycomb holes in the second direction, when the exciter excites the sound-emitting substrate to generate vibration, in the process of conducting the vibration in the sound-emitting substrate, the degree of attenuation in the first direction is less than the degree of attenuation in the second direction, so that it can be avoided that the difference of sound intensity and the mutual overlapping influence of the vibration due to the equal vibration amplitudes of different position points of the sound-emitting substrate in the second direction cannot be distinguished, thereby avoiding the inability to distinguish the left channel and the right channel of the projection screen, and avoiding the positioning influence on the sound. Because the sounding substrate can vibrate to sound under the excitation of the exciter, a loudspeaker does not need to be arranged on the projection screen, the volume of the projection screen is reduced, and the synchronous audio-visual effect of sound and picture in the same direction as the image is met.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, which may be configured as shown in fig. 1, and includes: a projection screen, which may be the projection screen provided in the above embodiments, and a signal providing assembly. The signal providing component can be used for providing audio current for the projection screen and projecting an image corresponding to the audio current to the projection screen, and the projection screen can be used for displaying the image and playing audio according to the audio current provided by the signal providing component. Illustratively, the signal providing component may be a laser television box. The display device may be a laser television or a projector, etc.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (10)

1. A display device, characterized in that, comprising: a projection screen, the projection screen includes: an exciter and a sound-emitting substrate, the exciter is arranged on one side of the sound-emitting substrate, and is used to drive the sound-emitting substrate to emit sound; The sound-emitting substrate includes: a honeycomb layer and a skin disposed on both sides of the honeycomb layer; The honeycomb layer has a plurality of honeycomb holes, and the compliance of the honeycomb holes in the first direction is smaller than the compliance of the honeycomb holes in the second direction; the compliance of the skin in the first direction is less than the compliance of the skin in the second direction; Wherein, the first direction and the second direction are both perpendicular to the depth direction of the honeycomb holes, and the first direction and the second direction are perpendicular. 2. The display device according to claim 1, wherein, The opening shape of the honeycomb hole is a convex hexagon, and the convex hexagon has two parallel sides of equal length, and has a first axis of symmetry and a second axis of symmetry, the first axis of symmetry and the two The parallel sides are all parallel to the first direction, the second axis of symmetry is parallel to the second direction, and the first axis of symmetry is perpendicular to the second axis of symmetry. 3. The display device according to claim 2, wherein, The stretch ratio of the convex hexagon ranges from 0.3 to 0.7, the stretch ratio is the ratio of the first distance to the second distance, and the first distance is the distance between the two parallel sides, The second distance is the sum of the length of the first diagonal of the convex hexagon and the length of any one of the two parallel sides, the first diagonal and the first axis of symmetry parallel. 4 . The display device according to claim 1 , wherein the material of the skin is unidirectional fibers, and the extending direction of the unidirectional fibers is the first direction; 5 . Alternatively, the material of the skin is an interwoven fiber formed by interlacing unidirectional fibers with different extension directions. Among the interwoven fibers, the number of unidirectional fibers whose extension direction is the first direction is greater than the number of unidirectional fibers whose extension direction is the first direction. The number of unidirectional fibers in the second direction. 5 . The display device according to claim 3 , wherein the value range of the first distance can be 3˜10 mm. 6 . 6 . The display device according to claim 1 , wherein the thickness of the skin can range from 0.1 to 0.5 mm. 7 . 7. The display device according to any one of claims 1 to 6, wherein the sound-emitting substrate comprises at least a first vibration region and a second vibration region, the first exciter is arranged in the first vibration region, and the first vibration region is disposed in the first vibration region. Two exciters are arranged in the second vibration zone; When the vibration generated by the first exciter is conducted to the second vibration region along the second direction, the vibration amplitude of the first exciter is attenuated and increased; When the vibration generated by the second exciter is conducted to the first vibration region along the second direction, the vibration amplitude of the second exciter is attenuated and increased. 8. The display device according to any one of claims 1 to 6, wherein the sound-emitting substrate has a plurality of vibration areas and an isolation area located between every two adjacent vibration areas, and the isolation area is located between two adjacent vibration areas. The stiffness in the second direction is smaller than the stiffness of the vibration region in the second direction, and the compliance of the isolation region in the second direction is greater than the compliance of the vibration region in the second direction. 9. The display device according to claim 8, wherein, The honeycomb pores in the isolation area are filled with sound-absorbing material, so that the isolation area can transmit vibrations to the isolation area by absorbing. 10. A sound-emitting substrate, characterized in that the sound-emitting substrate comprises: a honeycomb layer and a skin disposed on both sides of the honeycomb layer; The honeycomb layer has a plurality of honeycomb holes, the depth direction of the honeycomb holes is parallel to the thickness direction of the honeycomb layer, and the rigidity of the honeycomb holes in the first direction is greater than the rigidity of the honeycomb holes in the second direction ; the compliance of the skin in the first direction is less than the compliance of the skin in the second direction; Wherein, the first direction and the second direction are both perpendicular to the depth direction of the honeycomb holes, and the first direction and the second direction are perpendicular.

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