CN106019750A - Liquid crystal display panel and display device - Google Patents

Abstract

The invention relates to the technical field of display, in particular to a liquid crystal panel and a display device. The problem that in the prior art, a pixel structure corresponding to an improved FFS display mode leaks light in a dark state is solved. A bucking electrode is arranged between an opposite-side substrate and an array substrate, the orthographic projection of the bucking electrode on the array substrate at least covers data lines of the array substrate, meanwhile, voltage signals of the bucking electrode and voltage signals of a common electrode are the same, in this way, the bucking electrode can offset or shield electric fields generated by some pixel electrodes (and a common electrode) and the data lines, the data lines are shielded, and therefore the problem of light leakage is effectively improved.

Description

A liquid crystal display panel and display device

technical field

The invention relates to the field of display technology, in particular to a liquid crystal display panel and a display device.

Background technique

In fringe field switching FFS display mode, in order to improve Trace Mura, the pixel electrode is designed to have a certain angle, such as the corner structure in the dotted frame area A1 and A2 shown in Figure 1(a). However, this design will cause the liquid crystal to not be completely deflected when the pixel is normally displayed, and there will be a certain dark area in the dotted frame area, which will eventually affect the liquid crystal light efficiency of the entire pixel structure and have a negative impact on the increase in product transmittance.

In order to improve this defect of low light efficiency, the ordering of the pixel electrodes in the FFS display mode can be designed from horizontal to vertical, as shown in Figure 1(b), which is about to improve the extended area where the corner structure of Trace Mura is located from along the The direction of the data line is changed to be along the direction of the gate line, see the dotted frame areas B1 and B2 in Figure 1(b), thereby reducing the area of the extended area where the corner structure is located, and improving the liquid crystal light efficiency to a certain extent.

However, for the pixel structure corresponding to the improved FFS display mode shown in Figure 1(b), since the corner structure is located in the extension area, there is an electrode strip perpendicular to the pixel electrode between the signal line and the pixel electrode in the adjacent pixel unit. The electric field in the extension direction, and the initial direction of the liquid crystal is along the extension direction of the electrode strips in the pixel electrode. Therefore, in the dark state, the liquid crystals in the dotted frame areas B1 and B2 will deflect to a certain extent, and then cause light leakage.

Contents of the invention

Embodiments of the present invention provide a liquid crystal display panel and a display device, which are used to solve the problem of light leakage in the dark state of the pixel structure corresponding to the improved FFS display mode existing in the prior art.

Embodiments of the present invention adopt the following technical solutions:

A liquid crystal display panel, comprising: an array substrate, an opposite substrate facing the array substrate, and a liquid crystal layer sandwiched between the array substrate and the opposite substrate,

A shielding electrode is arranged between the opposite side substrate and the array substrate, and the orthographic projection of the shielding electrode on the array substrate at least covers the data line of the array substrate, wherein the shielding electrode is applied The voltage signal is the same as the voltage signal applied to the common electrode on the array substrate.

Optionally, the shielding electrode is located on a side close to the array substrate in the black matrix of the opposite substrate, wherein the black matrix is located between adjacent color photoresists.

Optionally, the shielding electrode and the pixel electrode of the array substrate are arranged in the same layer and are insulated from each other.

Optionally, the shielding electrode is electrically connected to the common electrode on the side of the array substrate through a via hole.

Optionally, the shielding electrode is made of transparent conductive oxide or metal.

Optionally, the shielding electrode is located between adjacent color photoresists, and the material of the shielding electrode is metal.

Optionally, the orthographic projection of the shielding electrode on the array substrate does not overlap with the orthographic projection of the pixel electrode on the array substrate.

Optionally, the orthographic projection of the shielding electrode on the array substrate is a mirror image along the central line of the data line.

Optionally, the distance between the orthographic projection of the boundary of the shielding electrode close to the pixel electrode on the array substrate and the orthographic projection of the corresponding boundary of the data line on the array substrate is greater than or equal to 3 μm, Less than or equal to 8 μm.

A display device includes the liquid crystal display panel.

In the embodiment of the present invention, a shielding electrode is provided on the side of the opposite substrate close to the array substrate or on the side of the array substrate close to the opposite substrate, and the orthographic projection of the shielding electrode on the array substrate covers at least The data line, and the voltage signal of the shielding electrode is the same as the voltage signal of the common electrode, so that the shielding electrode can offset or shield part of the electric field generated by the pixel electrode (and the common electrode) and the data line, and shield the data line. Therefore, the problem of light leakage is effectively improved.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1(a) is a pixel structure corresponding to the fringe field switch FFS display mode in the prior art;

Fig. 1(b) is the pixel structure corresponding to the improved fringe field switch FFS display mode in the prior art;

2 is a schematic cross-sectional structure diagram of a liquid crystal display panel provided by an embodiment of the present invention;

Fig. 3 (a) is one of the schematic diagrams of the display panel provided in the example of the present invention;

Fig. 3 (b) is the second schematic diagram of the display panel provided in the example of the present invention;

Figure 3(c) is the third schematic diagram of the display panel provided in the example of the present invention;

FIG. 4( a )- FIG. 4( b ) are exemplary diagrams of the size of the shielding electrode in the embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The technical solution involved in the present invention will be described in detail through specific examples below, and the present invention includes but is not limited to the following examples.

As shown in FIG. 2 , it is a schematic cross-sectional structure diagram of a liquid crystal display panel provided by an embodiment of the present invention. It should be noted that, since the top view of the liquid crystal display panel in the present invention cannot well reflect the improvements, therefore, It is not specifically shown, and the cross-sectional view is explained by taking FIG. 1(b) as an example. The cross-sectional view is a schematic diagram of cutting the pixel area along the direction perpendicular to the data line; specifically, the panel mainly includes: an array substrate 21, and The opposite side substrate 22 facing the array substrate 21, and the liquid crystal layer (not shown) interposed between the array substrate 21 and the opposite side substrate 22, a shielding layer is arranged between the opposite side substrate 22 and the array substrate 21 electrode 23, and the orthographic projection of the shielding electrode 23 on the array substrate 21 covers at least the data line 211 of the array substrate 21, wherein the voltage signal applied to the shielding electrode 221 is the same as the voltage signal applied to the common electrode 212 on the array substrate 21 .

In addition, the opposite substrate 22 in the panel also includes: a first base 221, and a color photoresist 222 located on the side of the first base 221 close to the array substrate 21; the array substrate 21 also includes: a second base 213 located on the second base The first insulating layer 214 on the side close to the opposite substrate 22 in the second base 213, wherein the common electrode 212 and the data line 211 are located on the first insulating layer 214, and the second insulating layer located on the common electrode 212 and the data line 211 An insulating layer 215, on which the second insulating layer 215 is a pixel electrode 216; the shielding electrode 23 is located on the outermost layer of the opposite substrate 22 on the side close to the array substrate 21 or on the side of the array substrate 21 close to the opposite substrate 22 the outermost layer.

Through the above technical solution, the problem of light leakage in the dark state of the pixel structure corresponding to the current FFS display mode (hereinafter specifically referred to as the improved FFS display mode shown in Figure 1(b)) can be effectively improved, because the current FFS In the display mode, in the dark state, there is no voltage difference between the pixel electrode and the common electrode, but the voltage on the data line changes periodically, therefore, both the pixel electrode and the common electrode must generate an electric field with the data line, and The direction of the electric field is perpendicular to the direction of the data lines, and the initial arrangement direction of the liquid crystal molecules in the liquid crystal layer is along the direction of the data lines. Therefore, the electric field generated by the pixel electrode, the common electrode and the data lines will inevitably affect the liquid crystal molecules, resulting in The liquid crystal molecules are deflected, and thus, light leakage occurs. In the present invention, referring to FIG. 2 , the orthographic projection of the shielding electrode 23 on the array substrate 21 covers at least the data line 211 of the array substrate 21, and the voltage signal of the shielding electrode 23 is the same as the voltage signal of the common electrode 212, In this way, the shielding electrode 23 can offset or shield the electric field generated by part of the pixel electrode 216 (and the common electrode 212 ) and the data line 211 , and shield the data line 211 , thereby effectively improving the light leakage problem.

The display panel provided with the shielding electrode will be introduced below through specific examples.

Referring to FIG. 3( a ), which is a schematic diagram of a type of display panel provided in an example of the present invention, the shielding electrode 23 and the pixel electrode 216 of the array substrate 21 are arranged on the same layer and are insulated from each other. Since the voltage signal of the shielding electrode 23 is the same as the voltage signal of the common electrode 212, when the display panel works in a dark state, the shielding electrode 23 can block and cancel the voltage between the data line 211 and the pixel electrode 216 or the common electrode 212. The fringe field, therefore, reduces the deflection phenomenon of liquid crystal molecules near the data line (that is, at the boundary of the pixel unit), and improves the light leakage problem caused in the dark state.

Specifically, in the schematic structural diagram of the display panel shown in FIG. 3( a), the voltage signal of the shielding electrode 23 can be provided in various ways, for example, an additional signal line that is the same as the voltage signal of the common electrode 212 is introduced; and then , in order to avoid signal interference problems that may be caused by laying additional signal lines, preferably, the shielding electrode 23 can be electrically connected to the common electrode on the side of the array substrate through a via hole. For example, in the non-display area, a via hole is provided above the common electrode line parallel to the gate line to expose the common electrode line, and the shielding electrode 23 communicates with the common electrode line through the via hole.

Referring to 3(b), it is a schematic diagram of another type of display panel provided in the examples of the present invention. This schematic diagram is a schematic cross-sectional diagram of any pixel unit in the display area cut along the direction of the gate line. It can be seen from the diagram that the shielding The electrodes 23 are located on the side of the black matrix 223 of the opposite substrate 22 close to the array substrate 21 , wherein the black matrix 223 is located between adjacent color photoresists 222 . In this structure, on the one hand, the shielding electrode 23 can effectively improve the light leakage problem of the display panel; Reduce the capacitance generated by the overlapping of the shielding electrode 23 and the data line 211, thereby reducing the load power consumption of the panel and ensuring the charging performance. Especially for large-sized panels, the load requirements are more stringent, therefore, it is necessary to use as low an AC as possible. Stack capacitors to ensure panel performance.

In the display panel shown in FIG. 3( a ) and FIG. 3( b ), the shielding electrode is made of transparent conductive oxide or metal. For example: indium tin oxide TIO, or thinner metal silver, etc.

Referring to FIG. 3( c ), which is a schematic diagram of another type of display panel provided in the example of the present invention, it can be seen from the figure that the shielding electrode 23 is located between adjacent color photoresists 222 , and the material of the shielding electrode 23 is metal. Here, on the one hand, the shielding electrode 23 achieves the purpose of improving the light leakage problem in the dark state in the above examples, and on the other hand, since the shielding electrode 23 is made of metal, it can be used as a black matrix and have a light-shielding effect. In this way, the process for making the black matrix can be omitted, the process can be simplified, and the thickness of the display panel can be reduced to improve the quality of the display panel.

In fact, in the embodiment of the present invention, the orthographic projection of the shielding electrode on the array substrate does not overlap with the orthographic projection of the pixel electrode on the array substrate. Specifically, the first boundary of the shielding electrode in the direction perpendicular to the extending direction of the data line The orthographic projection on the array substrate is between the orthographic projection of the second boundary of the first pixel electrode on the array substrate and the orthographic projection of the first boundary of the data line on the array substrate; the shielding electrode is perpendicular to where the data line extends The orthographic projection of the second boundary in the direction on the array substrate is between the orthographic projection of the first boundary of the second pixel electrode on the array substrate and the orthographic projection of the second boundary of the data line on the array substrate; wherein, A pixel electrode and a second pixel electrode are respectively arranged on both sides of the data line, the first boundary of the shielding electrode and the first boundary of the data line are adjacent to the second boundary of the first pixel electrode, and the second boundary of the shielding electrode is adjacent to the second boundary of the data line. The second boundaries of the data lines are all adjacent to the first boundaries of the second pixel electrodes.

In the example of the present invention, the size of the shielding electrode is mainly related to the pixel electrode and the data line. Specifically, as shown in FIG. The pixel electrodes 32 are respectively arranged on both sides of the data line 33, the first boundary a1 of the shielding electrode 34 and the first boundary b1 of the data line 33 are both adjacent to the second boundary c2 of the first pixel electrode 31, and the second boundary c2 of the shielding electrode 34 Both the second boundary a2 and the second boundary b2 of the data line 33 are adjacent to the first boundary d1 of the second pixel electrode 32 . Only considering the position size of each film layer structure in the horizontal direction, the first boundary a1 of the shielding electrode 34 is between c2 and b1, and the second boundary a2 of the shielding electrode 34 is between d1 and b2, that is, the shielding electrode 34 The smallest size is the horizontal distance between b1-b2, and the largest is the horizontal distance between c2-d1, so that the shielding or shielding of the fringe field between the data line 33 and the pixel electrodes on both sides can be realized.

Optionally, in this embodiment of the present invention, considering that there may be pixel electrodes on both sides of the data line, in order to ensure the uniformity of the improvement effect, the orthographic projection of the shielding electrode on the array substrate along the center line of the data line is Mirror image, specifically, the orthographic projection of the first boundary of the shielding electrode on the array substrate in the direction perpendicular to the extension direction of the data line and the orthographic projection of the second boundary of the shielding electrode on the array substrate in the direction perpendicular to the extension direction of the data line Mirrored along the centerline L of the data line. Specifically, as shown in FIG. 4( b), the orthographic projection of the first boundary a1 of the shielding electrode 34 on the array substrate and the orthographic projection of the second boundary a2 on the array substrate are mirror images along the data line, that is, the shielding electrode 34 blocks the data. The extent of the fringing fields on both sides of the line 33 is the same, so the improvement is almost the same.

In fact, after many experiments, it is obtained that the distance between the orthographic projection of the boundary of the shielding electrode close to the pixel electrode on the array substrate and the orthographic projection of the corresponding boundary of the data line on the array substrate is greater than or equal to 3μm, less than or equal to 8μm. In a word, the shielding electrode satisfying the above pitch range has a better shielding effect, which can not only effectively improve the light leakage problem in the dark state, but also prevent the shielding electrode from being too large to affect the pixel electrode.

An embodiment of the present invention provides a display device, including any liquid crystal display panel provided by the embodiment of the present invention, wherein the display device can be a mobile phone, a tablet computer, a TV, a monitor, a notebook computer, or a digital photo frame , navigator and any other product or component with display function. The other essential components of the display device should be understood by those of ordinary skill in the art, and will not be repeated here, nor should they be regarded as limitations on the present invention.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (10)

1. A liquid crystal display panel, comprising: an array substrate, an opposite substrate opposite to the array substrate, and a liquid crystal layer sandwiched between the array substrate and the opposite substrate, characterized in that, A shielding electrode is arranged between the opposite side substrate and the array substrate, and the orthographic projection of the shielding electrode on the array substrate at least covers the data line of the array substrate, wherein the shielding electrode is applied The voltage signal is the same as the voltage signal applied to the common electrode on the array substrate. 2. The panel according to claim 1, wherein the shielding electrode is located on the side of the black matrix of the opposite substrate close to the array substrate, wherein the black matrix is located between adjacent color photoresists between. 3. The panel according to claim 1, wherein the shielding electrode and the pixel electrode of the array substrate are arranged in the same layer and are insulated from each other. 4. The panel according to claim 3, wherein the shielding electrode is electrically connected to the common electrode on the side of the array substrate through a via hole. 5. The panel according to any one of claims 2-4, wherein the shielding electrode is made of transparent conductive oxide or metal. 6. The panel according to claim 1, wherein the shielding electrode is located between adjacent color photoresists, and the material of the shielding electrode is metal. 7. The panel of claim 1 wherein, The orthographic projection of the shielding electrode on the array substrate does not overlap with the orthographic projection of the pixel electrode on the array substrate. 8 . The panel according to claim 7 , wherein the orthographic projection of the shielding electrode on the array substrate is a mirror image along the central line of the data line. 9. The panel according to claim 1-4, 6-8, wherein the orthographic projection of the boundary of the shielding electrode close to the pixel electrode on the array substrate and the corresponding boundary of the data line The distance between the orthographic projections on the array substrate is greater than or equal to 3 μm and less than or equal to 8 μm. 10. A display device, comprising the liquid crystal display panel according to any one of claims 1-9.