WO2019114114A1

WO2019114114A1 - Liquid crystal display panel and display device

Info

Publication number: WO2019114114A1
Application number: PCT/CN2018/074612
Authority: WO
Inventors: 卞峰苓
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2017-12-13
Filing date: 2018-01-30
Publication date: 2019-06-20
Also published as: CN108037610A

Abstract

A liquid crystal display panel (100) and a display device. By means of forming a conductive layer (22) between a colour resist layer (23) and a first substrate (21) of a colour film substrate (20) of a liquid crystal display panel (100), an auxiliary capacitor (C3) is formed between the conductive layer (22) and a common electrode layer (24) of the liquid crystal display panel (100), thereby increasing the total capacitance (C2) of the common electrode layer (24) and reducing the amount of voltage change produced on the common electrode layer (24) as a result of the coupling action of coupled capacitance, and thereby decreasing the horizontal crosstalk of the liquid crystal display panel (100).

Description

Liquid crystal display panel and display device

Technical field

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

Background technique

Liquid crystal displays (TFT-LCDs) dominate the current flat panel display market due to their small size, low power consumption and no radiation.

Referring to FIG. 1 , a liquid crystal display panel generally includes an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate. The color filter substrate is opposite to the array substrate, and a common electrode (CF_Vcom) is disposed on a surface of the color filter substrate facing the array substrate. The array substrate includes an array of thin film transistors (TFTs), pixel electrodes electrically connected to the thin film transistors, data lines (Data Lines) and scan lines (Gate Lines). The scan line is used to turn on a thin film transistor (TFT) switch, and the data line is filled with a different data voltage for different brightness display through the turned-on TFT switch. A voltage difference is generated between the pixel electrode and the common electrode on the color filter substrate by the difference in the voltage charged in the pixel electrode, thereby controlling the rotation of the liquid crystal in the liquid crystal layer, thereby realizing the screen display. And, the pixel electrode of the array substrate and the common electrode (CF_Vcom) of the color filter substrate, and the liquid crystal layer between the pixel electrode and the common electrode form a liquid crystal capacitor Clc; and the array substrate A coupling capacitance Cp is also formed between the scanning line and the common electrode of the color filter substrate.

When the liquid crystal panel is driven, the data line (Data Line) outputs a driving voltage of a positive polarity and a negative polarity at intervals. When the positive polarity data voltage on the data line and the negative polarity data voltage are frequently switched, the common electrode Vcom_CF on the side of the color filter substrate is coupled via the coupling capacitor Cp, and the voltage of the common electrode CF_Vcom is changed, thereby causing horizontal crosstalk. phenomenon. For example, the display screen described in FIG. 2 is taken as an example, wherein the gray level of the intermediate white area S1 is 255 gray scales, the gray scale of the surrounding gray area S2 is 127 gray scales, and the liquid crystal display panel is a TN type liquid crystal display. The panel has a polarity inversion direction of a positive polarity frame inversion, and the scan line turns on a row of thin film transistors from top to bottom. When the first scanning line in the horizontal range of the white area S1 is turned on, the gray line of the intermediate white area S1 is higher than the gray level of the surrounding gray area S2 when the first line of thin film transistors in the horizontal range of the area is turned on. The data line voltages of all the data lines in the area S1 are simultaneously increased, and the voltage of the common electrode Vcom_CF is simultaneously pulled due to the capacitive coupling of the coupling capacitance Cp between the data line and the common electrode Vcom_CF. high. When the scan line turns off the thin film transistor of the row, the voltage of the common electrode Vcom_CF is still not restored to a set voltage, thereby causing a pixel electrode corresponding to the thin film transistor of the row and the common electrode The voltage difference is actually smaller than the set value, so that the actually displayed picture is darker than the actual brightness, so that a horizontal dark line a appears. Similarly, when the first scan line in the gray area S2 below the horizontal range of the white area S1 turns on the corresponding row of thin film transistors, the voltage of the common electrode Vcom_CF is simultaneously lowered due to the decrease of the voltage of the data line. When the scan line turns off the thin film transistor of the row, the voltage of the common electrode Vcom_CF is still not restored to a set voltage, thereby causing a pixel electrode corresponding to the thin film transistor of the row and the common electrode The voltage difference is actually larger than the set value, so that the actually displayed picture is brighter than the actual brightness, so that a horizontal bright line b appears. The appearance of the horizontal case a and the horizontal bright line b indicates that the liquid crystal display panel generates horizontal crosstalk, so that the display quality of the liquid crystal display panel is affected.

Summary of the invention

The present invention provides a liquid crystal display panel and a display device which reduce the amount of change in voltage variation of the common electrode layer due to the coupling action of the coupling capacitance Cp, thereby alleviating the horizontal crosstalk phenomenon.

The liquid crystal display panel includes an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate; the color filter substrate includes a first substrate, and is sequentially stacked on the first a conductive layer on the base substrate, a color photoresist layer, and a common electrode layer disposed on the color film photoresist layer, wherein the conductive layer, the common electrode layer and the color photoresist layer form an auxiliary capacitor, To increase the total capacitance of the common electrode.

Wherein, the conductive layer is a transparent thin film conductive layer.

Wherein, the conductive layer is the same material as the common electrode layer, and the conductive layer is formed of an ITO material.

Wherein the conductive layer covers the first substrate.

The color photoresist layer includes a black matrix and a plurality of color photoresist blocks arranged in an array, and the black matrix is located in a gap between any two adjacent color photoresist blocks. The conductive layer is opposite to the black matrix, and a projection of the conductive layer in the color photoresist layer is located in the black matrix.

Wherein, the conductive layer is a metal thin film conductive layer.

The array substrate includes a second substrate and a first metal layer, a semiconductor layer, a second metal layer, and a pixel electrode layer sequentially stacked on the second substrate, the conductive layer and the first layer The material of one metal layer or the second metal layer is the same.

Wherein, the conductive layer has a thickness of 500 nm to 1000 nm.

The conductive layer includes a metal thin film conductive portion and a transparent thin film conductive portion; the metal thin film conductive portion is opposite to the black matrix, and the transparent thin film conductive portion is opposite to the colored photoresist block.

The display device includes the liquid crystal display panel.

According to the liquid crystal display panel of the present invention, the conductive layer is formed between the first substrate of the color filter substrate and the color photoresist layer, so that the conductive layer and the common electrode layer are The color photoresist layer forms an auxiliary capacitance, thereby increasing a total capacitance of the common electrode, reducing a variation amount of a voltage change generated on the common electrode layer due to coupling of the coupling capacitance, thereby reducing the liquid crystal display Horizontal crosstalk of the panel.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a circuit configuration diagram of a pixel unit of the liquid crystal display panel in the prior art;

2 is a schematic view showing the display of the liquid crystal display panel in the prior art;

Figure 3 is a schematic cross-sectional view showing an embodiment of the present invention;

Figure 4 is a schematic cross-sectional view showing another embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 3, the present invention provides a liquid crystal display panel 100. The liquid crystal display panel 100 includes an array substrate 10, a color filter substrate 20, and a liquid crystal layer 30 disposed between the array substrate 20 and the color filter substrate. The liquid crystal display panel 100 performs different screen display by varying voltages applied to different regions on both sides of the liquid crystal layer 30.

The array substrate 10 includes a second substrate 11 and a first metal layer 12, a semiconductor layer 13, a second metal layer 14, a passivation layer 15, and a pixel electrode layer which are sequentially stacked on the second substrate 11. 16. The materials of the first metal layer 12 and the second metal layer 14 may be the same or different materials. In this embodiment, the first metal layer 12 and the second metal layer 14 are formed of the same material. The array substrate 10 includes an array of thin film transistors and data lines, scanning lines, and the like electrically connected to the thin film transistors. The first metal layer 12 includes a gate of the thin film transistor and the scan line, and a gate of the thin film transistor is formed by the same process as the scan line. The second metal layer 14 includes a source, a drain, and the data line of the thin film transistor, and a source, a drain, and the data line of the thin film transistor are formed by the same process. The pixel electrode layer 16 includes arrayed pixel electrodes, each of which is electrically connected to one of the thin film transistors through a via. The scan line controls opening and closing of the thin film transistor, and the data line inputs different data signals through the thin film transistor to the pixel electrode corresponding to the thin film transistor, thereby controlling the liquid crystal display panel to be different. The screen is displayed.

The color filter substrate 20 includes a first base substrate 21, a conductive layer 22 sequentially laminated on the first base substrate 21, a color photoresist layer 23, and a common electrode disposed on the color film photoresist layer. Layer 24.

The conductive layer 22 is deposited on the first base substrate 21 by a process such as vapor deposition, spin coating, inkjet printing, or sputtering. Specifically, different forming processes are selected according to different materials of the conductive layer 22. The conductive layer 22 may be a transparent conductive film layer or a non-transparent thin film conductive layer, and the conductive layer 22 may also cover the first substrate substrate 21 or partially cover the first liner. Base substrate 21. In this embodiment, the conductive layer 22 is a transparent indium tin oxide (ITO) thin film conductive layer formed on the first base substrate 21 by inkjet printing, and completely covers the first layer. A base substrate 21. In the present invention, the conductive layer 22 has a certain thickness, thereby preventing the conductive layer 22 from being too thin to be easily peeled off from the first substrate substrate 21. At the same time, it is necessary to prevent the thickness of the conductive layer 22 from being too thick, to ensure the thinning of the liquid crystal display panel 100, and to ensure that the liquid crystal display panel 100 of the conductive layer 22 has a high light transmittance. The display effect of the liquid crystal display panel 100 is ensured. In this embodiment, the conductive layer 22 has a thickness of 500 nm to 1000 nm.

The color photoresist layer 23 includes a black matrix 231 and a plurality of color photoresist blocks 232 arranged in an array, and the black matrix 231 is located in a gap between any two adjacent color photoresist blocks 232. in. The color photoresist layer 23 is specifically formed by forming a black matrix material layer on the conductive layer 22, and patterning the black matrix material layer to obtain a black matrix 231 having a plurality of openings arranged in an array. Further, colored photoresist materials of different colors are deposited in the openings of the black matrix 231 to form a plurality of colored photoresist blocks 232, thereby obtaining the color photoresist layer 23.

The common electrode layer 24 is laminated on the color photoresist layer 23 and covers the color photoresist layer 23. Moreover, the common electrode layer 24 is formed of a transparent conductive material to avoid the influence of the common electrode layer 24 on the light transmittance of the liquid crystal display panel 100. In this embodiment, the common electrode layer 24 is formed of the same indium tin oxide (ITO) material as the conductive layer 22, thereby reducing the kinds of materials used in the preparation process of the liquid crystal display panel 100, thereby simplifying the liquid crystal. The manufacturing process and manufacturing cost of the display panel 100. The conductive layer 22, the common electrode layer 24 and the color photoresist layer 23 form an auxiliary capacitor C3. The auxiliary capacitor C3 has the conductive layer 22 and the common electrode layer 24 as electrode plates of the auxiliary capacitor C3, and the color resist layer 23 between the conductive layer 22 and the common electrode layer 24 is used as the electrode plate. medium. Since the auxiliary capacitance C3 is formed between the conductive layer 22 and the common electrode layer 24, the total capacitance C2 of the common electrode layer 24 is increased. The total capacitance C2 of the common electrode layer 24 is the sum of all the capacitances of the common electrode layer 24 as one electrode plate, and includes the liquid crystal capacitor Clc with the common electrode layer 24 and the pixel electrode as an electrode plate. And the common electrode layer 24 and the data line are used as the coupling capacitance Cp of the electrode plate and the like. In the present invention, the total capacitance of the common electrode layer 24 is increased by adding one of the subsidiary capacitors C3. An empirical formula based on the amount of voltage change across the common electrode layer 24:

ΔU=ΔV×Clc/C2

Wherein, ΔU is a voltage change amount on the common electrode layer 24, ΔV is a voltage change amount of a data signal input to the pixel electrode, and Clc is a size of a coupling capacitance formed by the data line and the common electrode layer 24, and C2 is The total capacitance of the common electrode layer 24. In the present invention, the voltage change amount ΔV of the data signal input to the pixel electrode is input according to a set value; the size C1 of the coupling capacitance formed by the data line and the common electrode layer 24 is in the data line structure and In the case where the structure of the common electrode layer 24 is constant, the size of the C1 does not change. In the present application, by increasing the total capacitance C2 of the common electrode layer 24, the amount of change in the voltage change generated on the common electrode layer 24 due to the coupling action of the coupling capacitance Cp can be reduced, thereby The horizontal crosstalk phenomenon is alleviated, so that the liquid crystal display panel 100 has a good display effect.

Referring to FIG. 4 , the present invention further provides another liquid crystal display panel 200. The liquid crystal display panel 200 is different from the liquid crystal display panel 100 in that the conductive layer 22 is an opaque metal conductive material, including but not limited to A metal copper thin film layer, a metallic silver thin film layer or a metal aluminum thin film layer. Since the conductive layer 22 is an opaque metal conductive material, the conductive layer 22 needs to be patterned such that the conductive layer 22 only partially covers the first substrate substrate 21, thereby avoiding the conductive layer 22 The effect of the light output of the liquid crystal display panel 100. Specifically, in this embodiment, by patterning the conductive layer 22, the conductive layer 22 is opposite to the black matrix 231 of the color photoresist layer, so that the conductive layer 22 is in the color photoresist The projection in the layer 23 is located in the black matrix 231, so that the conductive layer 22 that does not transmit light is prevented from affecting the light output of the liquid crystal display panel 100. Further, in this embodiment, the material of the conductive layer 22 is the same as the material of the first metal layer 12 or the second metal layer 14 of the array substrate 10, thereby reducing materials used when fabricating the array substrate 10. The type of the array substrate 10 further reduces the manufacturing cost of the array substrate 10. Further, the patterned region of the conductive layer 22, that is, the region corresponding to the color photoresist block, is filled with the color photoresist material or filled with a transparent material to avoid the thickness of the color light block. Too thick, the liquid crystal display panel has a better display effect. It can be understood that, in some embodiments of the present invention, the transparent material may be a transparent conductive material, that is, the conductive layer includes a metal thin film conductive portion and a transparent thin film conductive portion. The conductive portion of the metal thin film is opposite to the black matrix, and the conductive portion of the transparent thin film is opposite to the colored photoresist block. In other words, the projection of the conductive portion of the metal thin film on the color photoresist layer is located in the black matrix, and the projection of the color photoresist block on the conductive layer 22 is located in the conductive portion of the transparent film. . Therefore, while ensuring the display effect of the liquid crystal display panel 100, the size of the auxiliary capacitor C3 is increased, thereby increasing the total capacitance C2 of the common electrode layer 24, and reducing the generation of horizontal crosstalk.

According to the liquid crystal display panel of the present invention, the conductive layer is formed between the first substrate and the color photoresist layer of the color filter substrate such that the conductive layer and the common electrode layer Forming an auxiliary capacitor to increase the total capacitance of the common electrode, thereby reducing the amount of change in the voltage variation generated on the common electrode layer due to the coupling effect of the coupling capacitor Cp, reducing the horizontal crosstalk phenomenon, and improving the The display effect of the liquid crystal display panel.

The invention also provides a display device comprising the liquid crystal display panel. The display device may be various display devices such as a mobile phone, a tablet, a computer, a smart watch, an e-book, an electronic newspaper, and the like.

The above disclosure is only a preferred embodiment of the present invention, and of course, the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the present invention. The equivalent changes required are still within the scope of the invention.

Claims

A liquid crystal display panel includes an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate; the color filter substrate includes a first substrate, and is sequentially stacked on the substrate a conductive layer on the first substrate, a color photoresist layer, and a common electrode layer disposed on the color filter layer, wherein the conductive layer, the common electrode layer and the color photoresist layer are attached A capacitor to increase the total capacitance of the common electrode.
The liquid crystal display panel of claim 1, wherein the conductive layer is a transparent thin film conductive layer.
The liquid crystal display panel according to claim 2, wherein the conductive layer is made of the same material as the common electrode layer, and the conductive layer is formed of an ITO material.
The liquid crystal display panel of claim 2, wherein the conductive layer covers the first substrate.
The liquid crystal display panel of claim 1, wherein the color photoresist layer comprises a black matrix and a plurality of color photoresist blocks arranged in an array, the black matrix being located in any two adjacent colors In the gap between the photoresist blocks, the conductive layer is opposite to the black matrix, and a projection of the conductive layer in the color photoresist layer is located in the black matrix.
The liquid crystal display panel according to claim 5, wherein the conductive layer is a metal thin film conductive layer.
The liquid crystal display panel of claim 6, wherein the array substrate comprises a second substrate and a first metal layer, a semiconductor layer, a second metal layer, and a pixel sequentially stacked on the second substrate An electrode layer, the conductive layer being the same material as the first metal layer or the second metal layer.
The liquid crystal display panel according to claim 1, wherein the conductive layer has a thickness of 500 nm to 1000 nm.
The liquid crystal display panel according to claim 1, wherein the conductive layer comprises a metal thin film conductive portion and a transparent thin film conductive portion; the metal thin film conductive portion is opposite to the black matrix, and the transparent thin film conductive portion is The color resist block is opposite.
A display device, comprising: a liquid crystal display panel; the liquid crystal display panel includes an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate; a base substrate, a conductive layer sequentially laminated on the first base substrate, a color photoresist layer, and a common electrode layer disposed on the color filter layer, the conductive layer and the common electrode layer An auxiliary capacitance is formed with the color photoresist layer to increase the total capacitance of the common electrode.
The display device of claim 10, wherein the conductive layer is a transparent thin film conductive layer.
The display device according to claim 11, wherein the conductive layer is made of the same material as the common electrode layer, and the conductive layer is formed of an ITO material.
The display device of claim 11, wherein the conductive layer covers the first base substrate.
The display device according to claim 10, wherein said color photoresist layer comprises a black matrix and an array of a plurality of color photoresist blocks spaced apart from each other, said black matrix being located in any two adjacent said colored lights In the gap between the blocking blocks, the conductive layer is opposite to the black matrix, and a projection of the conductive layer in the colored photoresist layer is located in the black matrix.
The display device of claim 14, wherein the conductive layer is a metal thin film conductive layer.
The display device according to claim 15, wherein the array substrate comprises a second substrate and a first metal layer, a semiconductor layer, a second metal layer and a pixel electrode which are sequentially stacked on the second substrate a layer, the conductive layer being the same material as the first metal layer or the second metal layer.
The display device according to claim 10, wherein the conductive layer has a thickness of 500 nm to 1000 nm.
The display device according to claim 10, wherein the conductive layer comprises a metal thin film conductive portion and a transparent thin film conductive portion; the metal thin film conductive portion is opposite to the black matrix, the transparent thin film conductive portion and the color The photoresist block is opposite.