CN106896605A - Pixel array substrate and liquid crystal display device - Google Patents

Abstract

The invention provides a pixel array substrate and a liquid crystal display device. The pixel array substrate comprises at least one pixel, the pixel is provided with at least one pixel electrode unit, and the pixel electrode unit comprises: a main portion, a tapered portion and a branch portion. According to the configuration, the width of the main part is larger than the width of the metal wiring to avoid the leakage of the electric field of the data line, and the gradual design of the branch parts is utilized to avoid the alignment error between the liquid crystal display device and other upper and lower laminates during the assembly, so that the contrast of the liquid crystal display picture is improved.

Description

Pixel array substrate and liquid crystal display device

This application is a divisional application, its parent application number is 201310270011.7, the filing date is June 28, 2013, and the title of the invention is "pixel array substrate and liquid crystal display device".

technical field

The present invention relates to a pixel array substrate, in particular to a pixel array substrate for a liquid crystal display device.

Background technique

The rapid progress of the multimedia society is mostly due to the dramatic progress of semiconductor elements or display devices. As far as display devices are concerned, thin film transistor liquid crystal display devices (Thin Film Transistor Liquid Crystal Display, TFT-LCD) with superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of the market.

At present, the pixel electrodes of some liquid crystal display devices are designed to be in the shape of a zigzag. However, on the data line of the pixel electrode, because the electrode does not completely cover the data line, the electric field of the data line leaks out, resulting in light leakage and liquid crystal inversion instability. Often due to the phenomenon of light leakage, the contrast of the picture cannot be improved.

Contents of the invention

The invention provides a pixel array substrate, which can avoid the leakage of the electric field of the data line.

The invention provides a liquid crystal display device, and can provide a liquid crystal display device capable of improving picture contrast.

The pixel array substrate of the present invention includes at least one pixel, the pixel has at least one pixel electrode unit, and a metal wiring, and the pixel electrode unit includes a trunk portion, the trunk portion is substantially parallel to the metal wiring, and is connected to the metal wiring. The metal traces overlap and the width of the trunk portion is greater than the width of the metal traces; in a preferred embodiment of the present invention, the pixel electrode unit further includes a tapered portion and a branch portion, the tapered portion is formed from the metal The side surface of the trace extends along a long axis direction perpendicular to the metal trace and toward the long axis direction, and the branch portion has two branch units that are substantially symmetrical to each other with respect to the long axis direction, each The branch unit has a plurality of inclined branches obliquely extending from the tapered portion and the trunk portion toward a direction gradually away from the long axis and toward a direction gradually approaching the metal trace.

In a preferred embodiment of the present invention, the width of the trunk portion is wider than that of the metal trace, and is greater than 3 μm and less than 10 μm.

In a preferred embodiment of the present invention, the tapered part is parallel to the width presented by the metal traces (that is, the width generated in the direction of the symmetrical long axis of the tapered part), and gradually shorten.

In a preferred embodiment of the present invention, the pixel array substrate of the present invention further includes a connecting portion located at the intersection of the metal trace and the long axis direction, wherein the tapered portions of the two symmetrical pixel electrode units pass through the connecting portion time connected to each other.

In a preferred embodiment of the present invention, the inclined branches of each branch unit are substantially parallel to each other and separated from each other by the same predetermined distance, and the inclined branches of each branch unit have substantially the same inclined angle.

In a preferred embodiment of the present invention, the oblique branches of each branch unit can be divided into a plurality of oblique branches of the first type, a plurality of oblique branches of the second type and a plurality of oblique branches of the third type, each of the oblique branches of the first type each of the second type of inclined branches is connected to a tapered connection area of the tapered part at the same interval and parallel to each other, and each of the third The oblique-like branches are connected to the trunk at the same spacing distance and parallel to each other.

In a preferred embodiment of the present invention, the tapered portion further includes a first side and a second side, the first side and the second side form a gradual angle θ, and 0°<θ<150°.

In a preferred embodiment of the present invention, the metal wire is a data wire.

In a preferred embodiment of the present invention, the liquid crystal display device of the present invention may include the aforementioned pixel array substrate, an opposite substrate, a liquid crystal layer and a backlight module, the liquid crystal layer is disposed between the pixel array substrate and the opposite substrate and the pixels The array substrate and the opposite substrate are arranged on the backlight module.

Through the above configuration, the pixel array substrate and the liquid crystal display device of the present invention can avoid electric field leakage of data lines, effectively suppress light leakage and dynamic afterimage caused by coupling of data lines, and further improve picture contrast.

In order to further understand the technology, method and effect adopted by the present invention, please refer to the following detailed description and drawings of the present invention, and believe that the purpose, characteristics and characteristics of the present invention can be deeply and specifically understood from this, but The accompanying drawings and appendices are provided for reference and illustration only, and are not intended to limit the present invention.

Description of drawings

FIG. 1 is a schematic plan view of a pixel array substrate according to an embodiment of the present invention;

Fig. 2 is a partially enlarged view of area A of Fig. 1; and

FIG. 3 is a partial cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

【Symbol Description】

trunk 11

Taper 12

branch 13

data line 14

connection part 15

Pixel Array Substrate 21

Pixel electrode 22

Color filter layer 23

Black Matrix 231

Color filter film 232

Liquid crystal layer 24

Common electrode 25

Counter substrate 26

Polarizer 271

Polarizer 272

Backlight module 28

Partial zoom area A

Data line width D

Progressive start length L

Pixel electrode P

Trunk Width T

X axis X

Y axis Y

Asymptotic angle θ

detailed description

A pixel array substrate and a liquid crystal display device of the present invention will be explained below through embodiments. It should be noted that the embodiments of the present invention are not intended to limit the present invention to be implemented in any specific environment, application or special method as described below. Therefore, the descriptions about the embodiments are only for the purpose of explaining the present invention rather than limiting the present invention.

It should be noted that, in order to facilitate the description of the implementation mode, the following Y-axis represents the direction of the parallel metal traces in the embodiment, but its position is not equal to the Y-axis, and the X-axis represents the long axis direction away from the metal traces. The data line 14 is a preferred embodiment of a metal wire, but is not limited thereto.

Please refer to FIG. 1 , which is a schematic layout diagram of a pixel array substrate according to an embodiment of the present invention. In this embodiment, the pixel array substrate (pixel array substrate) of the present invention may include a plurality of pixel electrodes P, and each pixel electrode P has pixel electrode units connected to each other and substantially symmetrical to each other with respect to the Y axis (ie, pixel electrodes P). The left half region or the right half region of the electrode P), each pixel electrode unit includes a trunk portion 11 and a tapered portion 12 . Wherein the trunk portion 11 is substantially parallel to the Y axis, and overlaps with a data line 14 (the trunk portion 11 is on top) and the width of the trunk portion 11 is greater than the width of the data line 14. In a preferred embodiment, the width of the trunk portion 11 It is wider than the width of the data line 14 by more than 3 μm; the tapered portion 12 starts from the side of the main body 11 and extends along the X-axis toward the Y-axis. In a preferred embodiment, the tapered portion 12 is parallel to the Y-axis. The width (that is, the width produced by the tapered part 12 symmetrical to the X axis) is gradually shortened from the side end of the trunk part 11 to the direction of the Y axis. The tapered part 12 also includes a branch part 13, and the branch part 13 has two opposite The branch units are substantially symmetrical to each other on the X-axis, and each branch unit has a plurality of inclined branches extending obliquely from the tapered portion 12 and the trunk portion 11 in a direction gradually away from the X-axis and gradually approaching the Y-axis.

More specifically, in a preferred embodiment of the present invention, there are four branch units in one pixel electrode P, and the first quadrant, the second quadrant, the third quadrant and the fourth quadrant are defined by the intersection of the X axis and the Y axis. In terms of quadrants, the four branch units are respectively located in the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, and in addition, the plurality of inclined branches of each of the branch units are substantially parallel to each other and equally separated from each other. The predetermined distance, and the multiple inclined branches of each branch unit have substantially the same inclined angle.

In a preferred embodiment, the pixel array substrate of the present invention may further include a connection portion 15 located at the intersection of the X axis and the Y axis, and the tapered portions 12 of the two pixel electrode units are connected to each other through the connection portion 15 .

Please refer to FIG. 2 , which is a partially enlarged view of area A in FIG. 1 . It can be seen that in one embodiment, the inclined branches of the branch portion 13 of the pixel array substrate of the present invention can be divided into multiple first-type inclined branches and multiple second-type inclined branches. Inclined branches and a plurality of third-type inclined branches, each of the first-type inclined branches is connected to a basic connection area of the tapered part 12 at the same interval distance and parallel to each other (the left side of Fig. 2 is connected to the inclined part of the tapered part 12 branch, which can be regarded as the first side described in the claim), each second type of inclined branch is connected to a tapered connection area of the tapered part 12 at the same interval distance and parallel to each other (the middle section of Fig. 2 is connected to the tapered The oblique branches of the part 12 can be regarded as the second side described in the claims), each of the third type of oblique branches is connected to the main body 11 at the same distance and parallel to each other, wherein the basic connection area and the tapered connection area form A progressive angle θ, and the initial position of the tapered connection region and the defined boundary of the pixel form a progressive initial length L. In a preferred embodiment, the progressive angle θ<150° and L<3 μm. Such a configuration can not only avoid alignment errors between the pixel electrode of the present invention and other upper and lower laminates during assembly, but also effectively suppress the occurrence of edge dark lines.

Continuing to refer to FIG. 2 , it can be seen that in one embodiment, the trunk portion 11 of the pixel array substrate of the present invention has a width T, and the data line 14 has a width D, and T>D, in a preferred embodiment, T-D>3 μm. With such configuration, the trunk portion 11 (ie, the ITO layer of the thin film transistor) can fully cover the data line 14, effectively suppressing the phenomenon of light leakage and dynamic afterimage caused by the electric field breach of the data line.

Next, please refer to FIG. 3 , which is a partial cross-sectional view of a liquid crystal display device according to an embodiment of the present invention. In a preferred embodiment, the liquid crystal display device of the present invention may include the pixel array substrate 21 of the present invention, a counter substrate 26 and a liquid crystal layer 24 . The pixel array substrate 21 has a plurality of pixel electrodes 22 , which are shown as a single layer in FIG. 3 . The opposite substrate 26 has a common electrode 25 facing the pixel array substrate 21 . In addition, a common electrode 25 may be disposed on the pixel array substrate 21 of this embodiment, and the liquid crystal layer 24 is disposed between the pixel electrode 22 of the pixel array substrate 21 and the common electrode 25 of the counter substrate 26 . If the liquid crystal display device of the present invention adopts a transmissive or transflective design, it may further include a backlight module 28 to provide a surface light source, and the pixel array substrate 21 and the opposite substrate 26 are disposed on the backlight module 28 . The detailed operation method is the same as the generally known liquid crystal display device, and will not be repeated here.

Continuing to refer to FIG. 3 , in a preferred embodiment, the liquid crystal display device of the present invention may further include a color filter layer 23 . The color filter layer 23 may include a plurality of black matrices 231 and a plurality of color filter films 232 , wherein adjacent black matrices 231 have openings for accommodating the color filter films 232 . In this embodiment, the color filter layer 23 is disposed on the pixel array substrate 21 as an example, but the color filter layer 23 may also be disposed between the opposite substrate 26 and the common electrode 25 .

Continuing to refer to FIG. 3 , in a preferred embodiment, the liquid crystal display device of the present invention may further include two polarizers 271 and 272 . The polarizing plate 271 is disposed on the surface of the pixel array substrate 21 away from the liquid crystal layer 24, that is, the polarizing plate 271 and the liquid crystal layer 24 are respectively located on two opposite surfaces of the pixel array substrate 21; the polarizing plate 272 is disposed on the opposite substrate 26 away from the liquid crystal layer. On the surface of the layer 24 , that is, the polarizer 272 and the liquid crystal layer 24 are respectively located on two opposite surfaces of the opposite substrate 26 . In this embodiment, the polarizers 271 and 272 can be both linear polarizers, each has a transmission axis and can selectively allow light to pass through, and the configuration is such that the transmission axes of the two are orthogonal to each other, or the polarization The plates 271 and 272 may both be circular polarizing plates.

To sum up, the present invention can provide a pixel array substrate and a liquid crystal display device, which can avoid the leakage of the electric field of the data line 14 by utilizing the overlapping of the trunk portion 11 and the data line 14 and the width T of the trunk portion being greater than the width D of the data line, effectively suppressing Light leakage and dynamic afterimages caused by data line coupling, and at the same time use the progressive design of the inclined branch (gradual angle θ and progressive initial length L) to avoid alignment errors between the pixel electrode and the upper and lower layers during assembly, effectively suppressing The occurrence of edge dark lines inwardly improves the contrast of the LCD screen.

The above descriptions are only preferred feasible embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (10)

1. a kind of image element array substrates, it is characterised in that the image element array substrates include an at least pixel and an at least metal Cabling, and the pixel includes an at least pixel electrode, the pixel electrode is included：

One stem portion, parallel to the metal routing, in the range of the pixel electrode, the stem portion is complete for the stem portion Face covers the metal routing, and the stem portion width of the width more than the metal routing.

2. image element array substrates according to claim 1, it is characterised in that the width of the stem portion is walked with the metal Width differential between the width of line is less than 10 μm more than 3 μm.

3. image element array substrates according to claim 1, it is characterised in that the pixel electrode is also tapered comprising at least Portion and at least a branch, the tapered portion is from the edge of the stem portion with along the extension perpendicular to the metal routing Direction extends, and the branch is connected to the edge of the tapered portion, and the branch has multiple inclination branches.

4. image element array substrates according to claim 3, it is characterised in that the tapered portion is walked parallel to the metal The width of the bearing of trend of line is from the edge of the tapered portion for being connected to the stem portion toward the side away from the metal routing To being gradually shortened.

5. image element array substrates according to claim 3, it is characterised in that the multiple of each branch is inclined Oblique branch is parallel to each other and the identical preset distance that is separated, and each branch the multiple inclination branch tool There is identical squint angle.

6. image element array substrates according to claim 3, it is characterised in that the tapered portion also comprising one first side and One second side, perpendicular to the bearing of trend of the metal routing, and described first form while with described second on first side One progressive angle, θ, and 0 ° of 150 ° of ＜ θ ＜.

7. image element array substrates according to claim 3, it is characterised in that the metal routing is a data wire.

8. a kind of liquid crystal display device, it is characterised in that the liquid crystal display device includes：

One image element array substrates, the image element array substrates include an at least pixel and an at least metal routing, and the pixel Comprising an at least pixel electrode, the pixel electrode is included：

One stem portion, parallel to the metal routing, in the range of the pixel electrode, the stem portion is complete for the stem portion Face covers the width of the width more than the metal routing of the metal routing and the stem portion；

One opposite substrate；

One liquid crystal layer, the liquid crystal layer is configured between the image element array substrates and the opposite substrate；And

One backlight module, the image element array substrates are configured on the backlight module with the opposite substrate.

9. a kind of image element array substrates, it is characterised in that the image element array substrates include an at least pixel and an at least metal Cabling, and the pixel includes an at least pixel electrode, the pixel electrode is included：

One stem portion, the stem portion parallel to the metal routing, in the range of the pixel electrode, cover by the stem portion The metal routing is covered,

One tapered portion, is connected with the stem portion, and the tapered portion is from the edge of the stem portion with along perpendicular to the gold Belong to cabling bearing of trend extend, and the bearing of trend parallel to the metal routing of the tapered portion width further away from institute State stem portion smaller.

10. image element array substrates according to claim 9, it is characterised in that the pixel electrode also includes at least a point Branch, the branch is connected to the edge of the tapered portion, and the branch has multiple inclination branches.