CN203273503U - Direct type backlight module and liquid crystal display - Google Patents

Abstract

The utility model discloses a direct-type backlight module and a liquid crystal display. The direct-type backlight module includes a cavity composed of a backboard and a light source installed in the cavity. A light source is mounted on the side of the raised portion forming an acute angle with the bottom plate. The utility model proposes that in the direct-type backlight module, a light source is placed on the side of the raised part, so that the light coming out from the side of the light source can be reflected again by other raised parts set next to it, and the scattering of light is enhanced, thereby expanding the light output. Angle, thus reducing the light mixing distance.

Description

Direct type backlight module and liquid crystal display

technical field

The utility model relates to the technical field of liquid crystal display, in particular to a direct type backlight module and a liquid crystal display.

Background technique

The light mixing distance refers to the distance from the light-emitting point to the diffuser, that is, the thickness inside the display. Therefore, the size of the light mixing distance can reflect the thickness of the display to a certain extent. The size of the light mixing distance largely depends on the LED light emitting angle. The larger the light emitting angle, the smaller the light mixing distance. For example, the user's demand for a thin liquid crystal display requires a small light mixing distance to achieve the purpose of obtaining a thin liquid crystal display.

FIG. 1 is a schematic structural diagram of a direct-lit backlight module in the prior art. The direct type backlight module includes a backplane, LED2, reflective sheet 3, diffuser plate 4, first brightness enhancement sheet 5 and second brightness enhancement sheet 6. Wherein: the backboard includes a bottom board 1 and at least two side boards 7, and the angle between the bottom board 1 and the side boards 7 is 135 degrees. In this structure, the light emitting angle of the LED is relatively small, so the light mixing distance of the backlight module is relatively large. Due to the use of multiple point light sources in the backlight module of this structure, more light is emitted from the exit surface, so the light utilization rate is improved to a certain extent, but due to the large light-emitting angle and light mixing distance, this The thickness of the structural backlight module is relatively thick, and when the light mixing distance is reduced, the thickness of the backlight module will be correspondingly reduced.

Utility model content

The main purpose of the utility model is to provide a direct-lit backlight module and a liquid crystal display with reduced light mixing distance.

In order to achieve the above object, the utility model proposes a direct-type backlight module, the direct-type backlight module includes a cavity composed of a back plate and a light source installed in the cavity, the back plate includes a bottom plate, and the bottom plate A protruding part is provided on it, and at least one of the light sources is mounted on a side of the protruding part, and the side face forms an acute angle with the bottom plate.

Preferably, the raised portion is in the shape of a triangular prism, and one side of the triangular prism is attached to the bottom plate.

Preferably, there are two raised parts, and there are three light sources, one is arranged in the middle of the bottom plate and connects the two raised parts, and the other two are respectively installed on the two on the side faces of the raised portions facing away from each other.

Preferably, there is at least one raised portion, and the light sources are respectively arranged on two side surfaces of the raised portion.

Preferably, the angle between the side of the raised portion and the bottom plate is 5°-15°.

Preferably, the back plate further includes at least two side plates, and the angles formed between the at least two side plates and the bottom plate are both 135°-180°.

Preferably, the light source is an LED light bar.

Preferably, it further includes a reflective sheet arranged on the side of the raised portion, and the light source is attached to the reflective sheet through a PCB board.

Preferably, there are four side plates, and the four side plates and the bottom plate form a concave cavity with a reflective function.

The utility model further proposes a liquid crystal display, including the above-mentioned direct-lit backlight module.

The utility model proposes that in the direct-down type backlight module, a light source is placed on the side of the raised part, so that the light coming out from the side of the light source can be re-reflected by other raised parts set next to it, and the scattering of light is enhanced, thereby expanding the light output. angle, thereby reducing the light mixing distance.

Description of drawings

FIG. 1 is a schematic cross-sectional structural view of a direct-lit backlight module in the prior art;

2 is a schematic cross-sectional structure diagram of the first embodiment of the direct-lit backlight module of the present invention;

Fig. 3 is a top view of the backlight module shown in Fig. 2;

Fig. 4 is a schematic diagram of the optical path of the first embodiment of the direct type backlight module of the present invention;

Fig. 5 is a schematic cross-sectional structure diagram of the second embodiment of the direct type backlight module of the present invention;

FIG. 6 is a schematic diagram of the optical path of the second embodiment of the direct type backlight module of the present invention.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model provides a direct type backlight module.

Referring to Fig. 2 to Fig. 4, Fig. 2 is a schematic cross-sectional structure diagram of the first embodiment of the direct-type backlight module of the present invention; Fig. 3 is a top view of the backlight module shown in Fig. 2; Fig. 4 is a direct-type backlight module of the present utility model Schematic diagram of the optical path of the first embodiment of the backlight module.

In this embodiment, a direct-type backlight module includes a cavity 20 composed of a backplane 10 and a light source 30 installed in the cavity, wherein the backplane 10 includes a bottom plate 11 and at least two side plates 12, and in addition, On the bottom plate 11 and on the inner wall of the cavity, a raised portion 40 is provided, at least one light source 30 is installed on the side of the raised portion 40, and the side on which the light source 30 is installed forms an acute angle with the upper surface of the bottom plate 11 (taken here The angle between the side surface and the upper surface of the bottom plate 11 is an acute angle). The protruding part 40 can be provided with various shapes, as long as the angle between the side where the light source 30 is installed and the bottom plate 11 is guaranteed to be an acute angle, this angle refers to the acute angle formed by the side surface and the bottom plate 11, and the acute angle is preferably 5-15° . The utility model does not limit the shape of the protruding portion 40 . For example, the protruding portion 40 can be set as a protruding portion with a quadrangular cross-section, and at this time, it must be ensured that the side faces are inclined on the bottom plate 11 . The utility model proposes a preferred solution, the raised portion 40 is a conical protrusion, such as the raised portion 40 can be set as a triangular prism, the bottom surface of the triangular prism is perpendicular to the bottom plate 11, that is, one side of the triangular prism is attached to the on the bottom plate 11.

The side plate 12 and the bottom plate 11 of the cavity 20 form an obtuse angle, and at the same time, the light source 30 is placed on the side of the raised portion 40, so that the light coming out from the side of the light source 30 can be re-reflected by other raised portions 40 provided next to enhance the The scattering of light is improved, so that more light can be emitted from the light emitting surface, and at the same time, the light emitted to the side plate 12 of the cavity 20 is directly reflected and emitted from the front, which increases the light emitting angle and solves the problem caused by placing the light source 30 horizontally. The defect of narrow light exit angle caused by it reduces the light mixing distance. Simultaneously, the structure is simple and easy to realize. In the direct type backlight module, the light mixing distance can be adjusted within an appropriate range by adjusting the number of light sources 30 and the angle formed by the side where the light sources 30 are installed and the bottom plate 11 as required.

In the present invention, in order to achieve the purpose of increasing the luminous angle, it is sufficient to ensure that the sides of the raised portion 40 form an acute angle with the upper surface of the bottom plate 11 . And the installation of light source 30 has multiple ways, and the utility model proposes two kinds of implementation modes, as long as other implementation modes ensure that the sides of the raised portion 40 where the light source 30 is installed form an acute angle with the bottom plate 11, the utility model does not make any limitation on this. limited.

This embodiment proposes that in the first embodiment, the direct type backlight module includes a diffusion plate 50 fixed on the upper surface of the backplane 10 and arranged parallel to the bottom plate 11, a first brightness enhancement sheet 60, a second brightness enhancement sheet 70 and a glass 80. , the diffuser plate 50 , the first brightness enhancement sheet 60 , the second brightness enhancement sheet 70 and the glass 80 are fixed on the backplane 10 through the glue frame 90 . The light emitted by the light source 30 is reflected by the cavity 20 and the raised portion 40, and then further diffused by the diffusion plate 50 and strengthened by the first brightness enhancement sheet 60 and the second brightness enhancement sheet 70, thereby further improving the performance of the direct type backlight module. The light intensity of the group. In this embodiment, preferably, there are two raised portions 40 of the direct-lit backlight module, the light source 30 is an LED light bar, and there are three LED light bars, one LED light bar is set in the middle of the bottom plate 11 and The two bosses 40 are connected. The other two LED light bars are respectively installed on the sides of the two protrusions 40 facing away from each other. In this embodiment, preferably, the LEDs on the LED light bar are LEDs with lenses. The LED light bar at the middle position of the two protrusions 40 adopts a flat design, which can supplement the brightness of the middle part of the cavity 20 of the direct type backlight module. Specifically, the angle formed by the two sides of the raised portion 40 and the bottom plate 11 can be adjusted to obtain the required light output angle, so as to achieve the effect of reducing the light mixing distance of the direct-type backlight module and having no light shadow. Since the two LED light bars are placed on the side, the light output angle is increased compared with the flat-laying LED light bar, thereby providing technical support for realizing an ultra-thin direct-lit backlight module.

Further, the obtuse angle formed between the at least two side panels 12 and the bottom panel 11 is between 135° and 180°. The utilization rate of light can be maximized through the design of the large inclination angle, so the use of the light source 30 can be reduced.

Further, four side plates 12 may be provided, and the four side plates 12 and the bottom plate 11 form a concave cavity with a reflective function. By arranging four side plates 12 , the light source 30 can be scattered more to obtain a better scattering effect, so as to further enhance the uniformity of light.

Further, a reflection sheet (not shown in the figure) attached to the slope of the raised portion 40 is also included, and the LED light bar is arranged on the slope through the PCB board, so as to further increase light reflection. In addition, specifically, the cavity 20 has a reflective function, and the reflective sheet can be saved by introducing the cavity 20 with the reflective function.

Referring to Fig. 5 and Fig. 6, Fig. 5 is a schematic cross-sectional structural diagram of the second embodiment of the direct-type backlight module of the present invention; Fig. 6 is a schematic diagram of the optical path of the second embodiment of the direct-type backlight module of the present invention.

The utility model proposes that in the second embodiment, different from the above-mentioned first embodiment, the installation positions and numbers of the light sources 30 and the protrusions 40 of the backlight module in this embodiment are different. In this embodiment, at least one protruding part 40 is provided, and the light source 30 is provided on two side surfaces of the protruding part 40, and the protruding part 40 is preferably a triangular prism. The light source 30 is specifically an LED light bar, and the LED light bar is installed on two sides of the triangular prism. In this embodiment, there are three protrusions 40 and six LED light bars. Specifically, in production, the number of LED light bars and raised portions 40 can be set according to the size requirements of the backlight module, which is not limited by the present invention. The angles formed by the two sides of the raised portion 40 and the bottom surface are respectively α and β, both of which are acute angles. α and β can be set to be equal or unequal, and when α and β are equal, the raised portion 40 has a symmetrical structure. The light output angle of the mixed light of the LED can be adjusted according to the needs of α and β angles to obtain a suitable light output angle, thereby reducing the light mixing distance.

The utility model further provides a liquid crystal display.

In this embodiment, a liquid crystal display includes a direct-type backlight module. The specific structure of the direct-type backlight module refers to the above-mentioned embodiments, and will not be repeated here.

The utility model proposes a liquid crystal display, which can greatly enhance the uniformity of the backlight of the direct-lit backlight module. The obtuse angle is formed between the side plate and the bottom plate of the cavity, and the light source is placed on the side of the raised part, so that the light coming out from the side of the light source can be re-reflected by other raised parts set next to it, which enhances the scattering of light and makes it more stable. More light can be emitted from the light-emitting surface, which increases the light-emitting angle, solves the defect of narrow light angle caused by the flat light source, and thus reduces the light mixing distance. Simultaneously, the structure is simple and easy to implement. In the direct-type backlight module, by adjusting the number of light sources and the angle formed by the side where the light sources are installed and the bottom plate, the light mixing distance can be adjusted within an appropriate range.

The above are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. All equivalent structural transformations made by using the utility model specification and accompanying drawings are directly or indirectly used in other related technologies. Fields are all included in the scope of patent protection of the utility model in the same way.

Claims (10)

1. A direct-type backlight module, comprising a cavity composed of a back plate and a light source installed in the cavity, characterized in that, the back plate includes a bottom plate, and the bottom plate is provided with a raised portion, at least one The light source is installed on the side of the raised part, and the side is at an acute angle with the bottom plate. the 2 . The direct-lit backlight module according to claim 1 , wherein the raised portion is in the shape of a triangular prism, and one side of the triangular prism is attached to the bottom plate. 3 . the 3. The direct type backlight module according to claim 2, characterized in that, there are two protrusions, three light sources, one is arranged in the middle of the bottom plate, and the two The two raised parts are connected together, and the other two are respectively installed on the sides of the two raised parts facing away from each other. the 4 . The direct-lit backlight module according to claim 2 , wherein there is at least one raised portion, and the light sources are respectively arranged on two side surfaces of the raised portion. the 5. The direct-lit backlight module according to claim 3 or 4, wherein the angle between the side of the raised portion and the bottom plate is 5°˜15°. the 6 . The direct type backlight module according to claim 5 , wherein the back plate further comprises at least two side plates, and the angles formed between the at least two side plates and the bottom plate are both 135°˜180°. the 7. The direct type backlight module according to claim 6, wherein the light source is an LED light bar. the 8 . The direct type backlight module according to claim 1 , further comprising a reflective sheet disposed on a side of the raised portion, and the light source is attached to the reflective sheet through a PCB. the 9 . The direct-lit backlight module according to claim 6 , wherein there are four side plates, and the four side plates and the bottom plate form a concave cavity with a reflective function. the 10. A liquid crystal display, characterized by comprising the direct-lit backlight module according to any one of claims 1-9. the

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