CN105739191B - Display panel and display device - Google Patents

Abstract

The invention provides ase:Sub>A display panel and ase:Sub>A display device, wherein an electrode layer of the display panel comprises ase:Sub>A first main electrode extending along ase:Sub>A first direction, ase:Sub>A plurality of first branch electrodes and ase:Sub>A plurality of second branch electrodes which are positioned at two sides of the first main electrode, the first branch electrodes are separated by ase:Sub>A distance T, the first branch electrodes and the second branch electrodes are provided with ase:Sub>A first arc side edge and ase:Sub>A second arc side edge, the first arc side edge and the second arc side edge are provided with ase:Sub>A first shortest distance A along ase:Sub>A second direction, ase:Sub>A first peak is the highest point or the lowest point of the first arc side edge in the first direction, ase:Sub>A second peak is the highest point or the lowest point of the second arc side edge in the first direction, the first peak and the second peak are provided with ase:Sub>A second shortest distance B along the second direction, and T is more than or equal to 0.5T (B-A). The invention can improve the abnormal liquid crystal arrangement phenomenon caused by the discontinuous electric field at the turning part of the branch electrode of the electrode layer, thereby reducing the process time and improving the competitiveness of the product.

Description

Display panel and display device

technical field

The present invention relates to a display panel and a display device, in particular to a flat display panel and a flat display device.

Background technique

With the advancement of technology, flat panel display devices have been widely used in various fields, especially liquid crystal display devices, which have gradually replaced traditional cathode ray tube display devices due to their superior characteristics such as light and thin body, low power consumption and no radiation. , and applied to many types of electronic products, such as mobile phones, portable multimedia devices, notebook computers, LCD TVs and LCD screens, and so on.

At present, manufacturers of liquid crystal display devices are improving the wide viewing angle technology (Multi-domain Vertical Alignment, MVA) of thin-film transistor liquid crystal display devices (TFT LCD), polymer stable alignment (or polymer sustained alignment, Polymer Sustained Alignment, PSA) is a mature and mass-produced technology for improving optical properties such as aperture ratio and contrast. Among them, the PSA technology is to mix a photoreactive monomer (monomer) in the liquid crystal drop (One Drop Filling, ODF) process of the panel, then energize it, and perform ultraviolet light exposure to make the photoreactive monomer produce a chemical reaction. , and arrange the chemically reacted monomers according to the pattern of the transparent conductive layer on the thin film transistor substrate, so as to achieve the purpose of aligning the liquid crystal through the chemically reacted monomers.

In the prior art, the transparent conductive layer on the thin film transistor substrate generally includes a combination of main electrodes and branch electrodes. ) is generally designed with a sharp angle, so that there is an included angle between the branch electrode and the main electrode (the included angle is, for example, 45 degrees or 135 degrees). However, due to the design of the sharp corner at the turning point, during the electrification step, the liquid crystal molecules will be abnormally arranged due to the discontinuity of the electric field at the turning point. Therefore, it is necessary to increase the monomer chemical reaction time (curing time) to make the turning point The liquid crystal molecules at the position can be stably pre-tilted at an angle, so that the process time will be increased and the competitiveness of the product will be reduced.

Contents of the invention

The purpose of the present invention is to provide a display panel and a display device, which can improve the abnormal liquid crystal alignment caused by the discontinuity of the electric field at the turning point of the branch electrodes of the electrode layer, thereby reducing the process time and improving the competitiveness of the product.

To achieve the above purpose, a display panel according to the present invention includes a first substrate, a second substrate and an electrode layer opposite to the first substrate. The electrode layer is disposed on the first substrate and faces the second substrate, and includes a first stem electrode extending along a first direction and a plurality of first branch electrodes and a plurality of second branch electrodes located on both sides of the first stem electrode , the first branch electrodes or the second branch electrodes are separated by a distance T from each other, and there is a distance between one of the first branch electrodes and one of the second branch electrodes adjacent to the first trunk electrode. The first arc-shaped side and a second arc-shaped side, the first arc-shaped side and the second arc-shaped side have a first shortest distance A along a second direction perpendicular to the first direction, the first arc-shaped side has a first The vertex, the second arc-shaped side has a second vertex, the first vertex is the highest point or the lowest point of the first arc-shaped side in the first direction, and the second vertex is the highest point of the second arc-shaped side in the first direction point or the lowest point, and the first vertex and the second vertex have a second shortest distance B along the second direction, wherein A, B and T satisfy the following equation: 0.5T≤(B-A)≤T, and A, B and The unit of T is micron.

To achieve the above purpose, a display device according to the present invention includes a display panel and a backlight module. The backlight module is arranged opposite to the display panel. The display panel has a first substrate, a second substrate opposite to the first substrate, and an electrode layer. The electrode layer is arranged on the first substrate and faces the second substrate, and includes a first substrate extending along a first direction. A trunk electrode and a plurality of first branch electrodes and a plurality of second branch electrodes located on both sides of the first trunk electrode, the first branch electrodes or the second branch electrodes are separated by a distance T from each other, the first branch electrodes One of the electrodes and one of the second branch electrodes adjacent to the first trunk electrode have a first arc-shaped side and a second arc-shaped side, and the first arc-shaped side is perpendicular to the second arc-shaped side A second direction of the first direction has a first shortest distance A, the first arc-shaped side has a first apex, the second arc-shaped side has a second apex, the first apex is the first arc-shaped side on the first The highest point or the lowest point in the direction, the second vertex is the highest point or the lowest point of the second arc-shaped side in the first direction, and the first vertex and the second vertex have a second shortest distance B along the second direction, A, B and T satisfy the following equation: 0.5T≤(B-A)≤T, and the units of A, B and T are microns.

In an embodiment, A, B and T also satisfy the following equation: 0.6T≦(B−A)≦0.9T.

In one embodiment, two adjacent first branch electrodes are separated from each other by the distance along a third direction, two adjacent second branch electrodes are separated from each other by the distance along a fourth direction, and the third direction is the same as the first branch electrode. The four directions are substantially vertical.

In one embodiment, the first arc-shaped side is opposite to the second arc-shaped side.

In one embodiment, the first arc-shaped side and the second arc-shaped side are offset.

In one embodiment, the electrode layer further includes a second stem electrode alternately connected to the first stem electrode, and an included angle between the first stem electrode and the second stem electrode is between 80 degrees and 100 degrees.

In one embodiment, one of the first branch electrodes or the second branch electrodes further has a straight side, and the extension of the straight side and the included angle between the first stem electrode or the second stem electrode are between Between 5 degrees and 85 degrees.

Based on the above, in the display panel and display device of the present invention, the electrode layer includes a first trunk electrode extending along the first direction and a plurality of first branch electrodes and a plurality of second branches located on both sides of the first trunk electrode. electrodes, and the first branch electrodes or the second branch electrodes are separated by a distance T from each other. In addition, the first arc-shaped side and the second arc-shaped side have a first shortest distance A along the second direction perpendicular to the first direction, and the first vertex of the first arc-shaped side is the distance between the first arc-shaped side and the first direction. The highest point or the lowest point, the second vertex of the second arc-shaped side is the highest point or the lowest point of the second arc-shaped side in the first direction, and the first vertex and the second vertex have a second shortest point along the second direction. distance b. Among them, when A, B and T satisfy the equation: 0.5T≤(B-A)≤T, compared with the prior art, it can improve the abnormal phenomenon of liquid crystal alignment caused by the discontinuity of the electric field at the turning point of the branch electrode of the electrode layer, and then Reduce process time and improve product competitiveness.

Description of drawings

FIG. 1 is a schematic diagram of a display panel according to a preferred embodiment of the present invention.

FIG. 2A is a schematic diagram of an electrode pattern of an electrode layer in the display panel of FIG. 1 .

FIG. 2B is an enlarged schematic view of a region in FIG. 2A .

FIG. 3 is a schematic diagram of an electrode pattern of an electrode layer in another embodiment.

FIG. 4 is a schematic diagram of a display device according to a preferred embodiment of the present invention.

Detailed ways

A display panel and a display device according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same elements will be described with the same reference symbols.

Please refer to FIG. 1, FIG. 2A and FIG. 2B, wherein FIG. 1 is a schematic diagram of a display panel 1 according to a preferred embodiment of the present invention, and FIG. 2A is an electrode pattern of the electrode layer 13 in the display panel 1 of FIG. 1 2B is an enlarged schematic view of the region P of FIG. 2A .

The display panel 1 of this embodiment is, for example but not limited to, an in-plane switch (IPS) type liquid crystal display panel, a fringe field switching (fringe field switching, FFS) type liquid crystal display panel, a vertical alignment mode (vertical alignment mode) , VA mode) liquid crystal display panel or 3D liquid crystal display panel is not limited.

As shown in FIG. 1 , the display panel 1 includes a first substrate 11 , a second substrate 12 and an electrode layer 13 . In addition, the display panel 1 may further include a liquid crystal layer 14 (liquid crystal molecules are not shown). The display panel 1 is, for example but not limited to, applied on smart phones or tablet computers, or other electronic devices, and when light passes through the display panel 1 , each (sub)pixel of the display panel 1 can display colors to form an image.

The first substrate 11 is opposite to the second substrate 12 , and the liquid crystal layer 14 is sandwiched between the first substrate 11 and the second substrate 12 . Wherein, the first substrate 11 and the second substrate 12 can be made of light-transmitting materials, such as a glass substrate, a quartz substrate or a plastic substrate, but not limited thereto.

The electrode layer 13 is disposed on the first substrate 11 and faces the second substrate 12 . The electrode layer 13 is a transparent conductive layer, and its material is, for example but not limited to, indium-tin oxide (ITO) or indium-zinc oxide (IZO). In this embodiment, the electrode layer 13 is a pixel electrode layer of the display panel 1 and is electrically connected to a data line (not shown). Here, FIG. 2A only shows a part of the electrode layer 13 (still marked as 13 ) in FIG. 1 , and what is shown is a pattern of a pixel electrode of a sub-pixel of the display panel 1 .

In addition, the display panel 1 can also include a thin film transistor array, a color filter array and a black matrix layer (not shown), the thin film transistor array is arranged on the first substrate 11, and the color filter array or black matrix layer The layers may be disposed on the first substrate 11 or the second substrate 12 . Wherein, the thin film transistor array, the color filter array and the liquid crystal layer 14 can form a pixel array. In one embodiment, the black matrix layer and the color filter array can be respectively disposed on the second substrate 12, however, in another embodiment, the black matrix layer or the color filter array can also be respectively disposed on the first substrate 11 In addition, it is not limited to make it a BOA (BM on array) substrate or a COA (color filter on array) substrate. In addition, the display panel 1 may further include a plurality of scan lines and a plurality of data lines (not shown in the figure), the scan lines and the data lines are arranged alternately, for example, perpendicular to each other to define the region of the pixel array. Wherein, the pixel array includes a plurality of (sub)pixels, and the (sub)pixels are arranged in a matrix.

As shown in FIGS. 2A and 2B , the electrode layer 13 includes a first trunk electrode 131, a second trunk electrode 132 and a plurality of first branch electrodes 133 and 133 on both sides of the first trunk electrode 131. A plurality of second branch electrodes 134 . Wherein, the first main electrode 131 extends along a first direction D1, and the second main electrode 132 extends along a second direction D2, and the first direction D1 is substantially perpendicular to the second direction D2. In this embodiment, the first direction D1 is the up-down direction in FIG. 2A , and the second direction D2 is the left-right direction in FIG. 2A . However, in different embodiments, the first direction D1 can also be the left and right directions in FIG. 2A , and the second direction D2 can also be the up and down directions in FIG. 2A , which is not limited in the present invention.

The first stem electrodes 131 and the second stem electrodes 132 are connected in a staggered manner, and the included angle between the first stem electrodes 131 and the second stem electrodes 132 may be between 80 degrees and 100 degrees. Here, the connecting portion between the first main electrode 131 and the second main electrode 132 is located in the middle region of the electrode layer 13, and the angle between the first main electrode 131 and the second main electrode 132 is substantially 90 degrees (that is, The first direction D1 and the second direction D2 are substantially perpendicular) as an example. Since the first main electrode 131 and the second main electrode 132 are interlacedly connected, and the connection part thereof is located in the middle area, the electrode layer 13 can be divided into four electrode areas (with the first main electrode 131 and the second main electrode 132) 4 domains). In addition, there is a surrounding electrode 135 around the electrode layer 13 in this embodiment, and the surrounding electrode 135 has four surrounding parts 135a, 135b, 135c, 135d. The two main electrodes 132 are connected to the second branch electrodes 134, and the surrounding parts 135c, 135d are respectively connected to the first main electrode 131, the second main electrode 132 and the first branch electrodes 133 to form a closed electrode. Layer 13.

As shown in FIG. 2B , the first branch electrodes 133 or the second branch electrodes 134 are separated by a distance T from each other. Here, the distance between two adjacent first branch electrodes 133 along a third direction D3 is a distance T, and the distance between two adjacent second branch electrodes 134 along a fourth direction D4 is also a distance T. , and the third direction D3 and the fourth direction D4 are substantially perpendicular to each other. Among them, the first branch electrodes 133 are connected to the first stem electrodes 131 or the second stem electrodes 132, and the second branch electrodes 134 are connected to the first stem electrodes. The electrode 131 or the second stem electrode 132 is connected. Here, a part of the first branch electrodes 133 is connected to the first main electrode 131, a part of the first branch electrodes 133 is connected to the second main electrode 132, a part of the second branch electrodes 134 is connected to the first main electrode 131, and a part of the first branch electrodes 133 is connected to the second main electrode 132. The second branch electrode 134 is connected to the second main electrode 132 .

In addition, one of the first branch electrodes 133 and one of the second branch electrodes 134 have a first arc-shaped side C1 and a second arc-shaped side C2 adjacent to the first trunk electrode 131 . In this embodiment, the first branch electrodes 133 have first arc-shaped sides C1 adjacent to the first main electrode 131, and the second branch electrodes 134 have second arc-shaped sides adjacent to the first main electrode 131. Edge C2. Wherein, the first arc-shaped side C1 is opposite to the second arc-shaped side C2. However, in different embodiments, the first arc-shaped side C1 and the second arc-shaped side C2 can also be arranged in a misaligned position in the first direction D1 (that is, staggered up and down, not facing each other), which is not limited by the present invention. In addition, in addition to the first arc-shaped side C1 and the second arc-shaped side C2, the first branch electrode 133 and the second branch electrode 134 also have at least one straight side L, and the extension of the straight side L is the same as the first arc-shaped side L. The included angle θ of the main electrode 131 or the second main electrode 132 may be between 5 degrees and 85 degrees. Here, the included angle θ between the extension of the straight side L of the first branch electrode 133 (and the second branch electrode 134 ) and the first main electrode 131 is 45 degrees as an example.

In addition, the first arc-shaped side C1 and the second arc-shaped side C2 have a first shortest distance A along the second direction D2. In this embodiment, as shown in FIG. 2B , since the first arc-shaped side C1 and the second arc-shaped side C2 are disposed opposite to each other, the shortest distance between them along the second direction D2 is defined as A. However, in other embodiments, if other conditions remain unchanged, since it has been limited to be along the second direction D2, when the first arc-shaped side C1 and the second arc-shaped side C2 are misaligned, both The first shortest distance A along the second direction D2 is still the same as the relative arrangement in FIG. 2B . In addition, in some embodiments, the first shortest distance A can also be defined as follows: the first shortest distance A can also be the width of the first trunk electrode 131 along the second direction D2; or, it can also be two-phase There is a first gap adjacent to the first branch electrodes 133, and a second gap between the two adjacent second branch electrodes 134, and the first shortest distance A is the distance between the first gap and the second gap along the second direction D2. The shortest distance, the present invention does not limit the definition of the first shortest distance A.

In addition, the first arc-shaped side C1 has a first vertex V1, and the second arc-shaped side C2 has a second vertex V2. Wherein, the first vertex V1 is the highest or lowest point of the first arc-shaped side C1 in the first direction D1, and the second vertex V2 is the highest or lowest point of the second arc-shaped side C2 in the first direction D1 , and the first vertex V1 and the second vertex V2 have a second shortest distance B along the second direction D2. Here, the first vertex V1 is the highest point of the first arc-shaped side C1 in the first direction D1, and the second vertex V2 is also the highest point of the second arc-shaped side C2 in the first direction D1. It should be noted that the first direction D1 in this embodiment is the vertical direction in FIG. 2B , but in different embodiments, if the first direction D1 is the horizontal direction, the viewing angle of the electrode layer 13 is only rotated by 90 degrees, the same The first vertex V1 can be regarded as the highest or lowest point of the first arc-shaped side C1 in the first direction D1, and the second vertex V2 can also be regarded as the highest point of the second arc-shaped side C2 in the first direction D1 or nadir.

Through the actual experimental data, it is found that in the prior art, when the turning point connecting the branch electrode and the main electrode is designed as a sharp corner (that is, (B-A)=0), the penetration rate of the display panel 1 is relatively high, but There are many cases of abnormal arrangement of liquid crystal molecules; if the turning point is designed with an arc-shaped side, the value of (B-A)/T will increase, and the abnormal arrangement of liquid crystal molecules can be improved; but when (B-A)/T When the value of increases to 1 or more than 1, although the abnormal arrangement of liquid crystal molecules can be further improved, relatively, the transmittance tends to decrease significantly. Therefore, by changing the relative size of A and B (that is, the design of different arc-shaped sides), the best effect can be achieved between the transmittance and the abnormal arrangement of liquid crystal molecules.

Therefore, in the display panel 1 of this embodiment, the distance T between the first shortest distance A, the second shortest distance B and the first branch electrodes 133 (or the second branch electrodes 134) satisfies the following equation: 0.5T≤(B-A)≤T, the unit of A, B and T is micron. At this time, a better effect can be achieved between the transmittance and the abnormal alignment of liquid crystal molecules. Therefore, in the prior art, the alignment of liquid crystal molecules due to the discontinuity of the electric field at the turning point where the branch electrodes are connected to the main electrodes can be improved. The abnormal phenomenon, which can reduce the chemical reaction time of the monomer and improve the competitiveness of the product, and the benefit of this improvement is more obvious as the resolution (ppi) is higher. Preferably, if A, B and T also satisfy the following equation: 0.6T≦(B-A)≦0.9T, it will have a better improvement effect.

In addition, please refer to FIG. 3 , which is a schematic diagram of an electrode pattern of an electrode layer 13 a according to another embodiment.

The main difference between the electrode layer 13 a and the electrode layer 13 of FIG. 2A is that the electrode layer 13 a does not have the surrounding electrode 135 of the electrode layer 13 . Therefore, the electrode layer 13 a is an open electrode layer.

In addition, other technical features of the electrode layer 13 a can refer to the above-mentioned electrode layer 13 , which will not be repeated here.

In addition, please refer to FIG. 4 , which is a schematic diagram of a display device 2 according to a preferred embodiment of the present invention.

The display device 2 includes a display panel 3 and a backlight module 4 (Backlight Module). The display panel 3 and the backlight module 4 are disposed opposite to each other. Wherein, the display panel 3 has all the features of the above-mentioned display panel 1 and its variants, which will not be further described here. When the light E emitted by the backlight module 4 passes through the display panel 3 , each (sub)pixel of the display panel 3 can display colors to form an image.

To sum up, in the display panel and display device of the present invention, the electrode layer includes a first trunk electrode extending along the first direction and a plurality of first branch electrodes and a plurality of second branches located on both sides of the first trunk electrode. electrodes, and the distance T between the first branch electrodes or the second branch electrodes. In addition, the first arc-shaped side and the second arc-shaped side have a first shortest distance A along the second direction perpendicular to the first direction, and the first vertex of the first arc-shaped side is the distance between the first arc-shaped side and the first direction. The highest point or the lowest point, the second vertex of the second arc-shaped side is the highest point or the lowest point of the second arc-shaped side in the first direction, and the first vertex and the second vertex have a second shortest point along the second direction. distance b. Among them, when A, B and T satisfy the equation: 0.5T≤(B-A)≤T, compared with the prior art, it can improve the abnormal phenomenon of liquid crystal alignment caused by the discontinuity of the electric field at the turning point of the branch electrode of the electrode layer, and then Reduce process time and improve product competitiveness.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the patent application.

Claims (10)

1. A display panel, the display panel comprising:

a first substrate and a second substrate opposite to the first substrate;

a liquid crystal layer arranged between the first substrate and the second substrate; and

an electrode layer disposed on the first substrate and facing the second substrate, and comprising a first main electrode extending along a first direction, a plurality of first branch electrodes and a plurality of second branch electrodes disposed on both sides of the first main electrode, and a second main electrode, wherein the second main electrode is connected with the first main electrode in a staggered manner, an included angle between the first main electrode and the second main electrode is between 80 degrees and 100 degrees, one of the first branch electrodes and one of the second branch electrodes is provided with a first arc side and a second arc side adjacent to the first main electrode, the first arc side and the second arc side are provided with a first shortest distance A along a second direction perpendicular to the first direction, the second arc side is provided with a second vertex, the first vertex is a highest point of the first arc side in the first direction or a lowest point of the first arc side, the second vertex is a highest point of the first arc side in the first direction or a highest point of the second arc side in the first direction, the first arc side is a highest point of the first arc side in the first direction or a highest point of the second arc side in the first direction,

wherein A, B and T satisfy the following equation: the T is more than or equal to 0.6T and less than or equal to 0.9T, and the units of A, B and T are micrometers.

2. The display panel of claim 1, wherein two adjacent first branch electrodes are spaced apart from each other by the distance along a third direction, two adjacent second branch electrodes are spaced apart from each other by the distance along a fourth direction, and the third direction is substantially perpendicular to the fourth direction.

3. The display panel of claim 1, wherein the first arcuate side and the second arcuate side are disposed opposite to each other.

4. The display panel of claim 1, wherein the first arcuate side and the second arcuate side are offset.

5. The display panel of claim 1, wherein one of the first branch electrodes or the second branch electrodes further has a linear side, and an angle between the linear side and the first main electrode or the second main electrode is between 5 degrees and 85 degrees.

6. A display device, characterized in that the display device comprises:

a display panel having a first substrate, a second substrate opposite to the first substrate, a liquid crystal layer and an electrode layer, wherein the liquid crystal layer is disposed between the first substrate and the second substrate, the electrode layer is disposed on the first substrate and faces the second substrate, and comprises a first main electrode extending along a first direction, a plurality of first branch electrodes and a plurality of second branch electrodes disposed on both sides of the first main electrode, and a second main electrode, wherein the second main electrode is connected with the first main electrode in a staggered manner, the included angle between the first main electrode and the second main electrode is between 80 DEG and 100 DEG, the first branch electrodes or the second branch electrodes are separated from each other by a distance T, one of the first branch electrodes and one of the second branch electrodes adjacent to the first main electrode are respectively provided with a first arc side and a second arc side, the first arc side and the second arc side are provided with a first shortest distance A along a second direction perpendicular to the first direction, the first arc side is provided with a first peak, the second arc side is provided with a second peak, the first peak is the highest point or the lowest point of the first arc side along the first direction, the second peak is the highest point or the lowest point of the second arc side along the first direction, and the first peak and the second peak are provided with a second shortest distance B, A, B and T along the second direction, so that the following equation is satisfied: the T is more than or equal to 0.6T and less than or equal to 0.9T (B-A), and the units of A, B and T are micrometers; and

a backlight module set opposite to the display panel.

7. The display device of claim 6, wherein two adjacent first branch electrodes are spaced apart from each other by the distance along a third direction, two adjacent second branch electrodes are spaced apart from each other by the distance along a fourth direction, and the third direction is substantially perpendicular to the fourth direction.

8. The display device of claim 6, wherein the first arcuate side and the second arcuate side are disposed opposite each other.

9. The display device of claim 6, wherein the first arcuate side and the second arcuate side are offset.

10. The display device of claim 6, wherein one of the first branch electrodes or the second branch electrodes further has a linear side extending at an angle of between 5 degrees and 85 degrees to the first trunk electrode or the second trunk electrode.

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