WO2020062435A1

WO2020062435A1 - Liquid crystal display panel and manufacturing method thereof

Info

Publication number: WO2020062435A1
Application number: PCT/CN2018/113671
Authority: WO
Inventors: 白柏
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2018-09-28
Filing date: 2018-11-02
Publication date: 2020-04-02
Also published as: CN109143693A

Abstract

A liquid crystal display panel and a manufacturing method thereof. The manufacturing method comprises: providing a first substrate (31), applying an organic layer (32) to a display region (310) of the first substrate (31), and applying a first frame sealant (33) to the periphery of the organic layer (32); performing UV curing on the first frame sealant (33); applying a second frame sealant (34) to the periphery of the UV-cured first frame sealant (33); dispensing liquid crystals on the organic layer (32); and providing a second substrate (36), aligning the second substrate (36) with the first substrate (31) to form a cell, and performing UV curing on the second frame sealant (34). The invention enables full UV curing of a frame sealant, thereby mitigating the problem of liquid crystal contamination caused by insufficient UV curing of a frame sealant due to an increase in metal wires at the periphery of an array substrate, and accordingly mitigating the issues of non-uniform cell gaps at the periphery of a display device, and sealant collapse.

Description

Liquid crystal display panel and preparation method thereof

Technical field

The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display panel and a method for manufacturing the same.

Background technique

Thin Film Transistor-Liquid Crystal Display (TFT-LCD) has the advantages of thinness, shortness, low power consumption, and low heat. It stands out among many different types of display devices and is widely used, such as televisions, computers, Tablet computers and modern information devices such as mobile phones.

In TFT-LCD production, liquid crystal and frame sealant need to be dripped on the array substrate or color filter substrate, and then the two substrates are aligned to the box, and then the frame sealant is cured. Among them, the function of the frame sealant is to bond the array substrate and the color filter substrate, and protect the middle liquid crystal from the outside air and water. At present, the curing process of the frame sealant is mainly divided into two steps: firstly, it is cured by UV for exposure, and then further cured by heating to achieve the purpose of complete curing.

technical problem

Referring to FIGS. 1A-1C, a schematic diagram of a manufacturing process of a conventional thin film transistor liquid crystal display panel. First, as shown in FIG. 1A, an organic layer (PI) 12 and a seal 13 are coated on a substrate (assuming the substrate is a color filter substrate 11). Next, as shown in FIG. 1B, a liquid crystal (LC) 14 is dripped on the organic layer 12. Finally, as shown in FIG. 1C, after the two substrates are boxed, a liquid crystal 14 corresponding to the display area on the array substrate 15 is shielded by a UV mask 16, and then the ultraviolet light is irradiated on the substrate. The frame sealant 13 is UV-cured. The basic structure of the color filter substrate 11 is a color filter (CF) side glass substrate (Glass Substrate) 111, a black matrix (Black Matrix, BM for short), a color resist layer (R / G / B) 112, and a transparent conductive layer (ITO ) 113 and the like; the basic structure of the array substrate 15 is composed of an array-side glass substrate 151 and a metal wiring layer (Metal) 152 and the like.

With the increase of people's requirements for flat panel displays, narrow bezels have gradually become the mainstream of display. After the frame is narrowed, in order not to cause light leakage, the black matrix and the frame sealant generally overlap each other. Since ultraviolet light cannot pass through the black matrix, the UV of the frame sealant can only be irradiated from the array substrate. At the same time, the narrow bezel further requires the frame sealant to be thinned, so that the area of the metal wiring on the array substrate is small, resulting in a tighter metal line arrangement at the periphery of the array substrate. During the UV curing of the frame sealant, because the metal wires are very densely arranged, it is difficult for the part of the frame sealant blocked by the metal wires to be irradiated with ultraviolet light for curing, resulting in low curing degree and uneven curing of the frame sealant. Insufficient UV curing of the frame sealant will cause the liquid crystal to contact the incompletely cured frame sealant for a long period of time, which will cause liquid crystal pollution, and then cause problems such as uneven thickness of the peripheral box of the display (Mura) and puncture of the liquid crystal.

Therefore, how to fully UV-cure the frame sealant, improve the liquid crystal contamination caused by insufficient UV-curing of the frame sealant, and further improve the problems of uneven thickness (Mura) and LCD puncture of the peripheral boxes of the display are urgently needed to be solved during the development of narrow-frame LCD technology The problem.

Technical solutions

The object of the present invention is to provide a liquid crystal display panel and a method for preparing the same, which can sufficiently cure the frame sealant by ultraviolet, improve the liquid crystal pollution caused by insufficient UV curing of the frame sealant, and further improve the unevenness of the peripheral box of the display (Mura) and the liquid crystal. Puncture and other issues.

In order to achieve the above object, the present invention provides a method for preparing a liquid crystal display panel. The method includes the following steps: providing a first substrate, coating an organic layer on a display area of the first substrate, and applying an organic layer on the organic layer; The first frame sealant is coated on the periphery; the organic layer is masked by a first ultraviolet photomask, and the first frame sealant is irradiated with ultraviolet rays to ultraviolet cure the first frame sealant; Coating a second frame sealant on the periphery of the first frame sealant after ultraviolet curing; dripping liquid crystal on the organic layer; providing a second substrate, and pairing the second substrate with the first substrate The cell is covered with a second ultraviolet photomask, and the second frame sealant is irradiated with ultraviolet rays to ultraviolet cure the second frame sealant.

To achieve the above object, the present invention also provides a method for preparing a liquid crystal display panel, which includes the following steps: providing a first substrate, coating an organic layer on a display area of the first substrate, and coating a periphery of the organic layer; Cloth first frame sealant; UV curing the first frame sealant; coating a second frame sealant on the periphery of the first frame sealant after ultraviolet curing; dripping liquid crystal on the organic layer Providing a second substrate, placing the second substrate and the first substrate in a box, and performing ultraviolet curing on the second frame sealant.

In order to achieve the above object, the present invention also provides a liquid crystal display panel. The liquid crystal display panel includes: a first substrate having a display area; an organic layer corresponding to the display area on the first substrate; A first frame sealant on the periphery of the organic layer; a second frame sealer on the periphery of the first frame seal; a liquid crystal on the organic layer; The second frame sealant covers the second substrate of the liquid crystal.

Beneficial effect

By adjusting the production process and process, the present invention first applies an inner ring frame sealant, and after the organic layer coating is completed, before the two substrates face the box, the inner ring frame sealant is UV irradiated to make the inner ring frame sealant completely After UV curing, the outer sealant is coated on the periphery of the inner sealant, followed by liquid crystal dripping and subsequent processes, which can fully UV cure the sealant and improve the situation due to the increase of metal lines around the array substrate. Next, the liquid crystal pollution caused by insufficient UV curing of the frame sealant further improves the problems of uneven thickness of the peripheral boxes of the display and puncture of the liquid crystal.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present invention more clearly, the drawings used in the description of the embodiments are briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative labor.

1A-1C, a schematic diagram of a manufacturing process of an existing thin film transistor liquid crystal display panel;

2 is a schematic flowchart of a method for manufacturing a liquid crystal display panel according to the present invention;

3A-3E, production process schematic diagrams of a liquid crystal display panel manufacturing method of the present invention;

FIG. 4 is a cross-sectional view of a liquid crystal display panel of the present invention.

Embodiments of the invention

Hereinafter, embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, but should not be construed as limiting the present invention.

In the present invention, unless specifically stated and defined otherwise, the "first" or "down" of the second feature may include the first and second features in direct contact, and may also include the first and second features. Not directly, but through another characteristic contact between them. Moreover, the first feature is "above", "above", and "above" the second feature, including that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is higher in level than the second feature. The first feature is “below”, “below”, and “below” of the second feature, including the fact that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is less horizontal than the second feature.

The following disclosure provides many different implementations or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

Referring to FIGS. 2 and 3A-3E, FIG. 2 is a schematic flowchart of a method for manufacturing a liquid crystal display panel according to the present invention, and FIGS. 3A-3E are schematic views of a manufacturing process of a method for manufacturing a liquid crystal display panel according to the present invention. The preparation method includes the following steps: S21: providing a first substrate, coating an organic layer on a display area of the first substrate, and coating a first frame sealant on the periphery of the organic layer; S22: The first frame sealant is UV-cured; S23: the periphery of the first frame sealant is coated with a second frame sealant; S24: a liquid crystal is dripped on the organic layer; S25: a first Two substrates, the second substrate and the first substrate are placed in a box, and then the second frame sealant is UV-cured. The preparation method according to the present invention is described in detail below.

Regarding step S21: providing a first substrate, coating an organic layer on a display area of the first substrate, and coating a first frame sealant on the periphery of the organic layer, please refer to FIG. 2 and FIG. 3A together, where 3A is a schematic diagram of applying an organic layer and a first frame sealant on a first substrate according to an embodiment of the present invention. The organic layer 32 is coated on a region of the display area 310 of the first substrate 31; the first frame sealant 33 is coated on the periphery of the organic layer 32. The organic layer 32 is made of an organic material. The organic material may be, for example, polyimide (PI). PI has the characteristics of high temperature resistance, wide use temperature range, no obvious melting point, high insulation performance, and stable dielectric constant. The coating of the organic layer and the first frame sealant can refer to the prior art, and is not limited herein.

Regarding step S22: performing UV curing on the first frame sealant, please refer to FIG. 2 and FIG. 3B together, where FIG. 3B is a schematic diagram of the first frame sealant according to an embodiment of the present invention. Specifically, the organic layer 32 of the display area 310 may be shielded by a first UV mask 39, and the first frame sealant 33 may be irradiated with ultraviolet (UV) to perform ultraviolet irradiation on the first frame sealant 33. Curing.

Regarding step S23: coating the periphery of the first frame sealant with a second frame sealant after UV curing, please refer to FIG. 2 and FIG. 3C together, where FIG. 3C is a second example of applying a second seal Schematic diagram of the frame glue. Specifically, the second frame sealant 34 is coated on the periphery of the first frame sealant 33 after UV curing. Optionally, there is a gap between the second frame sealant 34 and the first frame sealant 33, that is, the two are not in contact. Optionally, the width of the second frame sealant 34 is greater than the width of the first frame sealant 33. In other embodiments, the width of the second frame sealant 34 may be equal to or smaller than the width of the first frame sealant 33. The coating of the second frame sealant can refer to the prior art, and is not limited herein.

Regarding step S24: dripping liquid crystal on the organic layer, please refer to FIG. 2 and FIG. 3D together, wherein FIG. 3D is a schematic diagram of liquid crystal dripping according to an embodiment of the present invention. Specifically, the liquid crystal 35 is dripped on the organic layer 32 corresponding to the display area on the first substrate 31. The liquid crystal dropping method can refer to the prior art, which is not limited herein.

Regarding step S25: providing a second substrate, aligning the second substrate with the first substrate, and then ultraviolet curing the second frame sealant, please refer to FIG. 2 and FIG. 3E together, FIG. 3E is a schematic diagram of two substrate-to-box and UV-curable second frame sealant according to an embodiment of the present invention. Specifically, after the second substrate 36 and the first substrate 31 face each other, the liquid crystal 35 in the display area 310 is blocked by a second UV mask 38, and then the second seal is irradiated with ultraviolet (UV). The frame sealant 34 performs UV curing on the second frame sealant 34. The two substrate-to-box process can refer to the prior art, which is not limited herein. The first ultraviolet photomask 39 and the second ultraviolet photomask 38 may be the same ultraviolet photomask.

In this embodiment, the first substrate 31 may be a color filter substrate. The color filter substrate includes a color filter-side glass substrate 311, a black matrix (BM), a color resist layer (R / G / B) 312, and a transparent substrate. The conductive layer 313 and the like. The second substrate 36 may be an array substrate. The array substrate includes an array-side glass substrate 361 and a metal wiring layer 362.

In the method for preparing a liquid crystal display panel of the present invention, by adjusting the production process and process, an inner ring frame sealant (that is, the first frame sealant) is first coated; after the organic layer is coated, the two substrates are aligned with the box, and the inner ring is aligned with the inner ring. The frame sealant is irradiated with UV to completely cure the inner ring frame sealant. After that, the outer frame sealant is coated with a peripheral circle sealant (ie, the second frame sealant), and then the liquid crystal is applied. Infusion and subsequent processes. The invention can sufficiently cure the frame sealant with ultraviolet light, improve the liquid crystal pollution caused by insufficient ultraviolet curing of the frame sealant due to the increase of metal lines around the array substrate, and further improve the problems of uneven thickness of the peripheral box of the display and puncture of the liquid crystal.

Referring to FIG. 4, a cross-sectional view of a liquid crystal display panel of the present invention. The liquid crystal display panel of the present invention includes a first substrate 31 having a display area 310, an organic layer 32 provided on the first substrate 31 corresponding to the display area 310, a first frame sealant 33 provided on the periphery of the organic layer 32, and A second frame sealant 34 on the periphery of the first frame seal 33, a liquid crystal 35 provided on the organic layer 32, a second substrate provided on the first frame seal 33 and the second frame seal 34 and covering the liquid crystal 35 36.

Preferably, the first frame sealant 33 and the second frame sealant 34 are both UV-curable frame sealants.

Optionally, there is a gap between the second frame sealant 34 and the first frame sealant 33, that is, the two are not in contact.

Optionally, the width of the second frame sealant 34 is greater than the width of the first frame sealant 33. In other embodiments, the width of the second frame sealant 34 may be equal to or smaller than the width of the first frame sealant 33.

Specifically, the first substrate 31 is a color filter substrate, and the second substrate 36 is an array substrate. The color filter substrate includes a color filter side glass substrate 311, a black matrix 312, a transparent conductive layer 313, and the like. The array substrate includes an array-side glass substrate 361, a metal wiring layer 362, and the like.

The liquid crystal display panel of the present invention improves the liquid crystal pollution caused by insufficient UV curing of the frame sealant due to the increase of metal lines around the array substrate, and further improves the problems of uneven thickness of the peripheral box of the display and puncture of the liquid crystal.

Industrial applicability

The subject matter of this application can be manufactured and used in industry with industrial applicability.

Claims

A method for manufacturing a liquid crystal display panel, wherein the method includes the steps of: providing a first substrate, coating an organic layer on a display area of the first substrate, and coating a first seal on the periphery of the organic layer; Frame adhesive; covering the organic layer with a first ultraviolet photomask; irradiating the first frame sealing adhesive with ultraviolet rays to perform ultraviolet curing on the first frame sealing adhesive; A second sealant is coated on the periphery of one sealant; a liquid crystal is dripped on the organic layer; a second substrate is provided, and the second substrate and the first substrate are aligned to a box, and then a second An ultraviolet photomask covers the liquid crystal, and the second frame sealant is irradiated with ultraviolet rays to ultraviolet cure the second frame sealant.
The method of claim 1, wherein a gap is formed between the second frame sealant and the first frame sealant.
The method of claim 1, wherein a width of the second frame sealant is greater than a width of the first frame sealant.
A method for preparing a liquid crystal display panel includes the following steps: providing a first substrate, coating an organic layer on a display area of the first substrate, and coating a first frame sealant on the periphery of the organic layer; The first frame sealant is UV-cured; the periphery of the first frame sealant is coated with a second frame sealant; the liquid crystal is dripped on the organic layer; a second substrate is provided, and The second substrate is box-to-box with the first substrate, and the second frame sealant is UV-cured.
The method according to claim 4, wherein the step of performing UV curing on the first frame sealant further comprises: covering the organic layer with a first UV photomask, and irradiating with UV light. The first frame sealant performs ultraviolet curing on the first frame sealant.
The method of claim 4, wherein the step of UV curing the second frame sealant further comprises: covering the liquid crystal with a second UV mask, and irradiating the liquid crystal with UV light. The second frame sealant is UV-cured.
The method of claim 4, wherein a gap is formed between the second frame sealant and the first frame sealant.
The method of claim 4, wherein a width of the second frame sealant is greater than a width of the first frame sealant.
A liquid crystal display panel, wherein the liquid crystal display panel includes: a first substrate having a display area; an organic layer corresponding to the display area on the first substrate; and a first seal provided on the periphery of the organic layer. A frame seal; a second frame seal provided on the periphery of the first frame seal; a liquid crystal provided on the organic layer; a frame seal provided on the first frame seal and the second frame seal and A second substrate covering the liquid crystal.
The liquid crystal display panel of claim 9, wherein the first frame sealant and the second frame sealant are both UV-curable frame sealants.
The liquid crystal display panel according to claim 9, wherein there is a gap between the second frame sealant and the first frame sealant.
The liquid crystal display panel of claim 9, wherein a width of the second frame sealant is greater than a width of the first frame sealant.
The liquid crystal display panel according to claim 9, wherein the first substrate is a color filter substrate, and the second substrate is an array substrate.