WO2020124705A1

WO2020124705A1 - Preparation method for display panel, display panel, and display device

Info

Publication number: WO2020124705A1
Application number: PCT/CN2019/070931
Authority: WO
Inventors: 陈珍霞; 陈黎暄
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2018-12-20
Filing date: 2019-01-09
Publication date: 2020-06-25
Also published as: CN109375413A

Abstract

A preparation method for a display panel, the display panel, and a display device. The preparation method comprises: providing a first substrate (801); coating a black matrix thin film on the first substrate (801), patterning the black matrix thin film, and forming a black matrix on the first substrate (801); disposing a second substrate (802) opposite to the first substrate (801); providing a liquid crystal layer (804) between the first substrate (801) and the second substrate (802).

Description

Preparation method of display panel, display panel and display device

Technical field

The present invention relates to the field of semiconductor technology, and in particular to a method for manufacturing a display panel, a display panel, and a display device.

Background technique

With the development of science and technology and the progress of society, people are increasingly dependent on information exchange and transmission. As the main carrier and material basis for information exchange and transmission, display devices have become a hot spot and high ground for many scientists engaged in information optoelectronic research. The quality requirements for real pictures are gradually improving, and the demand for high contrast has become an important trend.

Contrast is defined as the ratio of white state to black state. So for the improvement of contrast, there are two key points, one is the brightness of the white state, and the other is the brightness of the black state.

technical problem

The brightness of the white state can be improved by simple methods, such as increasing the brightness of the backlight, but this will increase energy consumption, increase the operating temperature, increase the problem of heat dissipation, and the cost will also rise. It can be seen that this method has many drawbacks ; On the other hand, by reducing the brightness of the black state to achieve the purpose of high contrast, reduce the brightness of the black state, but there is currently no effective implementation.

Technical solution

Embodiments of the present invention provide a preparation method of a display panel, a display panel, and a display device. While the cost and energy consumption are not increased, the contrast of the display panel is effectively improved.

To solve the above problem, in a first aspect, the present application provides a method for manufacturing a display panel, the method including:

Provide the first substrate;

Coating a black matrix film on the first substrate, patterning the black matrix film, and forming a black matrix light-shielding layer pattern on the first substrate;

A second substrate is provided opposite to the first substrate;

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

The step of patterning the black matrix film and forming a black matrix light-shielding layer pattern on the first substrate includes:

Patterning the black matrix film using a preset simulated light intensity mask to form a black matrix shading layer pattern on the first substrate;

The line width of the black matrix light-shielding layer pattern is 3 μm.

Further, the line width of the preset simulated intensity light mask is 1 to 4 μm.

Further, the preset simulated light intensity mask is a combined mask formed by 1 to 3 masks.

Further, the simulated light intensity mask includes a first mask, a second mask and a third mask arranged in order from left to right, and a first mask is arranged between the first mask and the second mask There is a gap, and a second gap is set between the second mask and the third mask.

Further, the third photomask is rectangular, or the right side of the third photomask is zigzag, and the left side is linear.

Further, the left side of the first photomask is zigzag, the right side is linear, or the first photomask is rectangular.

Further, the distance between the first pitch and the second pitch is equal.

In a second aspect, the present application provides a method for manufacturing a display panel, the method including:

Provide the first substrate;

A second substrate is provided opposite to the first substrate;

A liquid crystal layer is provided between the first substrate and the second substrate.

Further, the step of patterning the black matrix film and forming a black matrix light-shielding layer pattern on the first substrate includes:

Using a preset simulated light intensity mask, the black matrix film is patterned to form a black matrix light-shielding layer pattern on the first substrate.

Further, the distance between the first pitch and the second pitch is equal.

Further, the preset simulated light intensity mask is an independent mask, and both sides of the preset simulated light intensity mask are serrated.

Further, the preset simulated light intensity mask is symmetrical on both sides.

Further, the line width of the black matrix light-shielding layer pattern is 3 μm.

In a third aspect, the present application provides a display panel, which is manufactured by using the method for manufacturing a display panel according to any one of the first aspects.

According to a fourth aspect, the present application provides a display device, which includes the display panel described in the second aspect.

Beneficial effect

The method of the embodiment of the present invention provides a first substrate; coats a black matrix film on the first substrate, and patterns the black matrix film to form a black matrix on the first substrate; A second substrate; a liquid crystal layer is provided between the first substrate and the second substrate. In the embodiment of the present invention, a black matrix is used to form a light-shielding layer pattern to block light leakage in pixels, which can avoid the disadvantages of reflection and depolarization when the metal light-shielding layer is blocked, and effectively improve the contrast of the display panel while the cost and energy consumption are not increased.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings required 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 skilled in the art, without paying any creative work, other drawings can also be obtained based on these drawings.

FIG. 1 is a schematic structural view of using a metal light-shielding layer to block light leakage in pixels in the prior art;

2 is a schematic flowchart of an embodiment of a method for manufacturing a display panel provided by an embodiment of the present invention;

3 is a schematic structural view of an embodiment of a simulated light intensity mask in a method for manufacturing a display panel provided by an embodiment of the present invention;

4 is a schematic structural view of another embodiment of a method for manufacturing a display panel to provide a simulated light intensity mask according to an embodiment of the present invention

5 is a schematic structural view of another embodiment of a method for preparing a display panel to simulate a light intensity mask provided by an embodiment of the present invention;

6 is a light intensity distribution diagram corresponding to the photomask shown in FIG. 3 in an embodiment of the present invention;

7 is a light intensity distribution diagram corresponding to the photomask shown in FIG. 4 in an embodiment of the present invention;

8 is a schematic structural diagram of an embodiment of a display panel in an embodiment of the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation shown in the drawings Or the positional relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention. In addition, the terms "first" and "second" are used for description purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise specifically limited.

As shown in FIG. 1, it is a schematic diagram of the structure of using a metal light-shielding layer to block light leakage in pixels in the prior art. In the prior art, a metal pattern is generally used as shown in FIG. 1. The metal light-shielding layer 10 is used in liquid crystal (LC). ) The chaotic light leakage area 20 is blocked, but the disadvantages caused by the metal shading layer include metal reflection, which makes the liquid crystal display (LCD) reflection serious and reduces the image quality of the LCD; second, the edge of the metal shading layer has a depolarizing effect , Causing light leakage at its edges, causing black light leakage, but lowering the contrast.

Based on this, an embodiment of the present invention provides a method for manufacturing a display panel, a display panel, and a display device, wherein the method for manufacturing a display panel may include: providing a first substrate; and coating a black matrix on the first substrate A thin film, and patterning the black matrix film to form a black matrix light-shielding layer pattern on the first substrate; a second substrate is disposed opposite to the first substrate; between the first substrate and the second substrate Provides a liquid crystal layer.

As shown in FIG. 2, it is a schematic diagram of an embodiment of a method for manufacturing a display panel in an embodiment of the present invention,

S201. Provide a first substrate.

In general, a display panel usually includes an array substrate, a color filter substrate, and a liquid crystal material between the array substrate and the color filter substrate. The display area of the display panel includes pixel units distributed in an array, and each pixel unit includes a plurality of sub-pixel units, and each sub-pixel unit can be used to display different colors. For example, when one pixel unit includes three sub-pixel units, the three sub-pixel units can be used to display three colors of red, green, and blue, respectively. The embodiment of the present invention does not specifically limit the number of sub-pixel units of the same pixel unit, for example, it may be three, four or more.

In the embodiments of the present invention, the material of the first substrate may be a glass substrate, a quartz substrate, a plastic substrate, or a substrate of other suitable materials. For example, in this embodiment, the first substrate may be a color filter substrate, on which RGB color filters distributed in an array may be formed, and each color filter is provided in a one-to-one correspondence with the sub-pixel units.

S202. Apply a black matrix film on the first substrate, pattern the black matrix film, and form a black matrix light-shielding layer pattern on the first substrate.

In the embodiment of the present invention, the step of patterning the black matrix film and forming a black matrix light-shielding layer pattern on the first substrate may further include: patterning the black matrix using a preset simulated light intensity mask A thin film, forming a black matrix light-shielding layer pattern on the first substrate. In the embodiment of the present invention, the simulated light intensity reticle is a reticle structure provided by the simulated light intensity, and specifically refer to the following detailed structure description.

In the embodiment of the present invention, the light-shielding light-shielding layer structure uses a black matrix (BM) material that absorbs light well. Compared with metal materials, it has no light emission and no light depolarization, which can effectively reduce black light leakage and improve display. Panel contrast.

However, using BM to block the light leakage in the pixels, the biggest difficulty is to make the BM size thin, the pixel size is very small, as the resolution increases, the pixel size will become smaller and smaller, and the light leakage in it is blocked The structure of the shading layer will also be a very small size. As we all know, BM materials are difficult to make fine under normal manufacturing process. Therefore, further, in the embodiment of the present invention, the step of patterning the black matrix film and forming a black matrix light-shielding layer pattern on the first substrate includes: using a preset simulated light intensity mask to pattern In the black matrix film, a black matrix light-shielding layer pattern is formed on the first substrate.

Wherein, the preset simulated light intensity mask may be a combined mask formed by 1 to 3 masks. Specifically, as shown in FIGS. 3 and 4, the simulated light intensity mask may include a first mask 301, a second mask 302 and a third mask 303 which are arranged in order from left to right. The first mask 301 and A first distance is set between the second photomask 302, and a second distance is set between the second photomask 302 and the third photomask 303. The second photomask 302 may be rectangular. In one embodiment of the present invention, as shown in FIG. 3, the third photomask 303 may also be rectangular. In another embodiment of the present invention, as shown in FIG. 4, The right side of the third photomask 303 is zigzag, and the left side is linear. Similarly, as shown in FIG. 4, the left side of the first photomask 301 may be zigzag and the right side is linear. As shown in FIG. 3, the first photomask 301 may also be rectangular. In addition, in the embodiment of the present invention, the distance between the first pitch and the second pitch may be set to be equal.

In some other embodiments of the present invention, the preset simulated light intensity mask is an independent mask. Specifically, as shown in FIG. 5, both sides of the preset simulated light intensity mask are serrated. Further, the preset simulated light intensity hood is symmetrical on both sides, that is, the preset simulated light intensity hood is symmetrical on both sides.

In Figures 3, 4, and 5, the light intensity distribution of the simulated light intensity mask is preset, and the critical value of the light intensity required for BM exposure development is about 10 candela, as shown in Figure 6, which is the corresponding light of the mask of Figure 3 Strong distribution diagram, Figure 7 is the corresponding distribution diagram of the photomask of Figure 4. In the embodiment of the present invention, the preset simulated light intensity mask can achieve BM CD The width of 2.5-3.5 μm, that is, the line width of the black matrix light-shielding layer pattern is 2.5-3.5 μm, preferably, the line width of the black matrix light-shielding layer pattern is 3 μm. Among them, macro (Critical Dimension (CD) generally refers to the line width of the mask pattern.

S203. Set a second substrate opposite to the first substrate.

The second substrate may be made of the same material as the first substrate, or it may be different, which is not specifically limited here.

S204. Provide a liquid crystal layer between the first substrate and the second substrate.

In the embodiment of the present invention, in addition to the liquid crystal layer, other necessary structures may be provided in the space between the first substrate and the second substrate, for example, to ensure that the liquid crystal cell is thick between the first substrate and the second substrate The spacer (specifically, such as a columnar spacer or a spherical spacer), since the present invention does not involve the improvement of these structures, it will not be repeated here.

In order to better implement the manufacturing method of the display panel in the embodiments of the present invention, a display panel is also provided in the embodiments of the present invention. Prepared by the examples.

Specifically, as shown in FIG. 8, it is a schematic diagram of an embodiment of a display panel according to an embodiment of the present invention. The display panel includes:

The first substrate 801 is provided with a black matrix light-shielding layer pattern 803;

The second substrate 802 is disposed opposite to the first substrate 801;

The liquid crystal layer 804 is between the first substrate 801 and the second substrate 802.

When external light (for example, a backlight used for the display panel) is incident on the black matrix light-shielding layer pattern 803 through the first substrate 801, the light is specularly reflected or diffusely reflected on the lower surface of the black matrix light-shielding layer pattern 803. Return to the backlight, and then reflect it to the light emission direction by the reflective layer of the backlight, for example, these lights can be specularly reflected by the surface of the black matrix light-shielding layer pattern 803 multiple times, and finally pass through the pixel opening position, thereby reflecting the light The light loss of the invalid area of the display panel can be reduced, which in turn can improve contrast and reduce power consumption.

In the embodiments of the present invention, the display panel may be various types of display panels, such as a vertical electric field type, a horizontal electric field type, and the like. The embodiments of the present invention are not limited to specific types of display panels.

In order to better implement the method for manufacturing the display panel in the embodiments of the present invention, this embodiment provides a display device including the display panel structure of any of the embodiments disclosed in the embodiments of the present invention.

For example, the display device may be a display device such as a liquid crystal display, an electronic paper display, and any product or component having a display function, such as a TV, a digital camera, a mobile phone, a watch, a tablet computer, a notebook computer, a navigator, and the like.

During specific implementation, the above units or structures can be implemented as independent entities, or they can be combined in any combination as one or several entities. For the specific implementation of the above units or structures, please refer to the previous method embodiments. No longer.

The preparation method of the display panel, the display panel and the display device provided by the embodiments of the present invention have been described in detail above. Specific examples are used in this article to explain the principle and implementation of the present invention. The descriptions of the above embodiments are only It is used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, this specification The content should not be construed as limiting the invention.

Claims

A method for manufacturing a display panel, wherein the method includes:

Provide the first substrate;

Coating a black matrix film on the first substrate, patterning the black matrix film, and forming a black matrix light-shielding layer pattern on the first substrate;

A second substrate is provided opposite to the first substrate;

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

The step of patterning the black matrix film and forming a black matrix light-shielding layer pattern on the first substrate includes:

Patterning the black matrix film using a preset simulated light intensity mask to form a black matrix shading layer pattern on the first substrate;

The line width of the black matrix light-shielding layer pattern is 3 μm.
The method for manufacturing a display panel according to claim 1, wherein a line width of the preset simulated light intensity mask is 1 to 4 μm.
The method for manufacturing a display panel according to claim 1, wherein the preset simulated light intensity mask is a combined mask formed by 1 to 3 masks.
The method for manufacturing a display panel according to claim 3, wherein the simulated light intensity mask includes a first mask, a second mask, and a third mask arranged in order from left to right, the first light A first distance is set between the mask and the second reticle, and a second distance is set between the second reticle and the third reticle.
The method for manufacturing a display panel according to claim 4, wherein the third photomask is rectangular, or the right side of the third photomask is zigzag, and the left side is linear.
The method for manufacturing a display panel according to claim 4, wherein the left side of the first photomask is zigzag, the right side is linear, or the first photomask is rectangular.
The method for manufacturing a display panel according to claim 4, wherein the distance between the first pitch and the second pitch is equal.
A method for manufacturing a display panel, wherein the method includes:

Provide the first substrate;

Coating a black matrix film on the first substrate, patterning the black matrix film, and forming a black matrix light-shielding layer pattern on the first substrate;

A second substrate is provided opposite to the first substrate;

A liquid crystal layer is provided between the first substrate and the second substrate.
The method for manufacturing a display panel according to claim 8, wherein the step of patterning the black matrix film and forming a black matrix light-shielding layer pattern on the first substrate includes:

Using a preset simulated light intensity mask, the black matrix film is patterned to form a black matrix light-shielding layer pattern on the first substrate.
The method for manufacturing a display panel according to claim 9, wherein the line width of the preset simulated light intensity mask is 1 to 4 μm.
The method for manufacturing a display panel according to claim 9, wherein the preset simulated light intensity mask is a combined mask formed by 1 to 3 masks.
The method for manufacturing a display panel according to claim 11, wherein the simulated light intensity mask includes a first mask, a second mask, and a third mask arranged in order from left to right, the first light A first distance is set between the mask and the second reticle, and a second distance is set between the second reticle and the third reticle.
The method for manufacturing a display panel according to claim 12, wherein the third photomask is rectangular, or the right side of the third photomask is zigzag, and the left side is linear.
The method for manufacturing a display panel according to claim 12, wherein the left side of the first photomask is zigzag, the right side is linear, or the first photomask is rectangular.
The method for manufacturing a display panel according to claim 12, wherein the distance between the first pitch and the second pitch is equal.
The method for manufacturing a display panel according to claim 9, wherein the preset simulated light intensity mask is an independent mask, and both sides of the preset simulated light intensity mask are serrated.
The method for manufacturing a display panel according to claim 16, wherein the preset simulated light intensity mask is symmetrical on both sides.
The method for manufacturing a display panel according to claim 8, wherein the line width of the black matrix light-shielding layer pattern is 3 μm.
A display panel, wherein the display panel is prepared using the method for preparing a display panel as claimed in claim 8.
A display device comprising the display panel according to claim 12.