WO2020186561A1 - Method for manufacturing liquid crystal display panel - Google Patents

Abstract

A method for manufacturing a liquid crystal display panel, comprising: providing a color film substrate (1), the color film substrate (1) comprising a display area (11) and a non-display area (12) surrounding the display area (11); coating the non-display area (12) with an inner frame adhesive (2) surrounding the display area (11), and curing the inner frame adhesive (2); dropping liquid crystals (3) into the display area (11); coating the non-display area (12) with an outer frame adhesive (4) surrounding the inner frame adhesive (2); providing an array substrate (5), and cell-assembling the array substrate (5) and the color film substrate (1); and curing the outer frame adhesive (4) to connect the array substrate (5) to the color film substrate (1) by means of the outer frame adhesive (4). By coating and curing the inner frame adhesive (2) before the dropping of the liquid crystals (3), the degree of curing of the frame adhesive can be improved to improve the quality of liquid crystal display panels, so as to avoid poor display.

Description

Manufacturing method of liquid crystal display panel Technical field

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

Background technique

With the development of display technology, flat-panel display devices such as Liquid Crystal Display (LCD) have been widely used in mobile phones, TVs, and personal computers due to their advantages of high image quality, power saving, thin body and wide application range. Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream of display devices.

Most of the liquid crystal display devices currently on the market are backlit liquid crystal displays, which include a liquid crystal display panel and a backlight module. The working principle of the liquid crystal display panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The liquid crystal molecules are controlled to change direction by powering on or not, and the light of the backlight module Refraction produces a picture. Usually a liquid crystal display panel consists of a color filter (CF, Color Filter) substrate, a thin film transistor (TFT, Thin Film Transistor) substrate, a liquid crystal (LC, Liquid Crystal) sandwiched between the color filter substrate and the thin film transistor substrate, and a seal sealant ( Sealant), and its molding process generally includes: front-end array (film, yellow, etching, and peeling), middle-end cell (TFT substrate and CF substrate bonding) and back-end module assembly Manufacturing process (drive IC and printed circuit board pressing). Among them, the front Array process is mainly to form TFT substrates to control the movement of liquid crystal molecules; the middle Cell process is mainly to add liquid crystal between the TFT substrate and the CF substrate; the back module assembly process is mainly to drive IC pressing and printed circuits The integration of the board drives the rotation of the liquid crystal molecules to display images. According to the current Cell manufacturing process, the CF substrate or TFT substrate is coated with sealant after the alignment film (PI) process, and then liquid crystal is dripped. After the upper and lower substrates of CF and TFT are assembled, the sealant is cured to form a seal Of the liquid crystal cell (LCD) Cell).

With the development of display technology, the narrowing of the frame has gradually become the mainstream of display. In the prior art, the frame is narrowed while preventing light leakage. As shown in FIG. 1, when the frame sealant 101 is coated on the color film substrate 100 , The frame sealant 101 will be set to overlap the black matrix 102. Correspondingly, due to the shielding of the black matrix 102, the step of irradiating the frame sealant 101 with UV light to cure it cannot be on the side of the color film substrate 100 It is done, and it needs to be adjusted to one side of the array substrate 200, and the area of the array substrate 200 opposite to the frame sealant 101 is generally provided with many densely arranged metal wires 201. During UV curing, the metal wires 201 is arranged very densely. It is difficult for the frame sealant 101 blocked by the metal wire 201 to be irradiated with ultraviolet light for curing, resulting in the frame sealant being wider on the metal wire 201, or the curing degree of the denser area is low, and the curing is uneven. This in turn causes problems such as uneven cell thickness (Mura) around the display and liquid crystal puncture; in addition, in the display panel using polymer-stabilized vertical alignment (PSVA) technology, due to the difference between the sealant and the liquid crystal The distance between them is very close. When the frame sealant is irradiated with UV light, it is easy to illuminate the liquid crystal layer, which causes the monomer in the liquid crystal layer to react in advance, and then causes poor display.

technical problem

The object of the present invention is to provide a method for manufacturing a liquid crystal display panel, which can increase the curing degree of the sealant, improve the quality of the liquid crystal display panel, and avoid display defects.

Technical solutions

To achieve the above objective, the present invention provides a method for manufacturing a liquid crystal display panel, which includes the following steps:

Step S1: Provide a color filter substrate, which includes a display area and a non-display area surrounding the display area;

Step S2, forming an inner sealant surrounding the display area by coating on the non-display area, and curing the inner sealant;

Step S3: Drop liquid crystal in the display area;

Step S4, forming an outer frame rubber surrounding the inner frame rubber by coating on the non-display area;

Step S5, providing an array substrate, and combining the array substrate and the color filter substrate into a box;

Step S6: curing the outer frame glue to connect the array substrate and the color filter substrate through the outer frame glue.

In the step S2, the inner sealant is cured by UV light.

The step of curing the outer frame glue in step S6 specifically includes:

Disposing a mask on the side of the array substrate away from the color filter substrate, the mask covering the display area;

Using the mask as a shield, UV light is irradiated to the outer frame glue from a side of the array substrate away from the color filter substrate, so that the outer frame glue is cured.

The mask also shields at least part of the inner sealant.

In the step S2, the coating of the inner sealant is completed by a coating machine platform, and the curing of the inner sealant is completed by setting a curing unit on the coating machine platform.

The curing unit is a UV lamp tube.

The width of the inner frame rubber is smaller than the width of the outer frame rubber.

The inner frame glue and the outer frame glue are arranged at intervals.

The non-display area of the color filter substrate is covered with a black matrix, and the inner frame glue and the outer frame glue are opposite to the black matrix.

The step S2 further includes coating an alignment film in the display area, and the liquid crystal is dropped on the alignment film in the step S3.

Beneficial effect

Beneficial effects of the present invention: the present invention provides a method for manufacturing a liquid crystal display panel, including the following steps: step S1, providing a color filter substrate, the color filter substrate including a display area and a non-display area surrounding the display area Step S2, coating the inner sealant surrounding the display area on the non-display area, and curing the inner sealant; step S3, dripping liquid crystal in the display area; step S4, in the non-display area Coat the outer frame glue surrounding the inner frame glue on the display area; step S5, provide an array substrate, and combine the array substrate and the color filter substrate into a box; step S6, cure the outer frame glue to The outer frame glue connects the array substrate and the color filter substrate, and by coating and curing the inner frame glue before the liquid crystal is dropped, the degree of curing of the frame glue can be improved, the quality of the liquid crystal display panel can be improved, and poor display can be avoided.

Description of the drawings

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. However, the accompanying drawings are only provided for reference and illustration and are not used to limit the present invention.

In the attached picture,

FIG. 1 is a schematic diagram of a conventional liquid crystal display panel;

2 is a schematic diagram of step S1 of the manufacturing method of the liquid crystal display panel of the present invention;

3 is a schematic diagram of step S2 of the manufacturing method of the liquid crystal display panel of the present invention;

4 is a schematic diagram of step S3 of the manufacturing method of the liquid crystal display panel of the present invention;

5 is a schematic diagram of step S4 of the manufacturing method of the liquid crystal display panel of the present invention;

6 is a schematic diagram of step S5 to step S6 of the manufacturing method of the liquid crystal display panel of the present invention;

FIG. 7 is a flow chart of the manufacturing method of the liquid crystal display panel of the present invention;

FIG. 8 is a schematic diagram of a coating machine in the manufacturing method of the liquid crystal display panel of the present invention.

Embodiments of the invention

In order to further explain the technical means adopted by the present invention and its effects, the following describes in detail the preferred embodiments of the present invention and the accompanying drawings.

Please refer to the figure 8 , The present invention provides a method for manufacturing a liquid crystal display panel, including the following steps:

step S1 , Provide a color film substrate 1 , The color film substrate 1 Including display area 11 And surround the display area 11 Non-display area 12 .

Specifically, the color filter substrate 1 Including base plate 15 , Located on the base substrate 15 Color filter layer 14 And black matrix 9 , And arranged on the color filter layer 14 And black matrix 9 Common electrode 10 , Where the color filter layer 14 Set in the display area 11 , The black matrix 9 Set in the non-display area 12 And display area 11 Color filter layer 14 The area between the different color resistances.

step S2 , In the non-display area 12 Surround the display area by coating 11 Inner frame glue 2 , And curing the inner frame glue 2 .

Specifically, the inner frame glue 2 At the common electrode 10 On, and with the non-display area 12 Black matrix 9 Right.

Optionally, in some embodiments of the present invention, the steps S2 Is also included in the display area 11 Alignment film formed by coating inside 8 Of course, this is not a limitation to the present invention. In other embodiments of the present invention, the liquid crystal display panel may also adopt optical alignment, and there is no need to provide an alignment film. 8 .

Specifically, the steps S2 Pass UV Light curing the inner frame glue 2 .

Specifically, as shown 8 Shown, the steps S2 Pass a coating machine 900 Finish the inner frame glue 2 The coating and pass in the coating machine 900 Set curing unit on 901 , Complete the inner frame glue 2 The curing, preferably, the curing unit 901 for UV Light tube.

That is, the present invention is adopted in the existing coating machine 900 Add on UV Lamp tube, so as to realize the inner frame glue 2 Finish the inner frame glue while coating 2 The curing.

step S3 , In the display area 11 Drop liquid crystal inside 3 .

Specifically, when the display area 11 Alignment film coated inside 8 When the liquid crystal 3 On the alignment film 8 on.

step S4 , In the non-display area 12 The inner frame glue is formed by coating 2 Frame glue 4 .

Preferably, the inner frame glue 2 With the outer frame glue 4 Interval settings.

Preferably, the inner frame glue 2 The width is smaller than the outer frame glue 4 The width.

step S5 , Provide an array substrate 5 ，The array substrate 5 With the color film substrate 1 To make up the box.

Specifically, the array substrate 5 The above also includes a display area and a non-display area, and the array substrate 5 The display area and the non-display area and the color film substrate 1 The display area and the non-display area are opposite, the array substrate 5 In the display area TFT Array, with peripheral driving circuit in non-display area 13 .

step S6 , Curing the outer frame glue 4 To pass the outer frame glue 4 Connect the array substrate 5 With the color film substrate 1 .

Specifically, the steps S6 In the curing of the outer frame glue 4 The specific steps include:

On the array substrate 5 Keep away from the color film substrate 1 Mask on one side 6 , The mask 6 Block the display area 11 ；

With the mask 6 To shield, from the array substrate 5 Keep away from the color film substrate 1 Side of the outer frame glue 4 Irradiate UV Light so that the outer frame glue 4 Curing.

Specifically, the UV Light passes through the peripheral driving circuit 13 The gap between illuminates the outer plastic frame 4 , So that the outer plastic frame 4 Curing.

Specifically, the mask 6 Also shield at least part of the inner frame glue 2 , Due to the inner frame glue 2 The curing has been completed, so the present invention can also increase the mask 6 Occlusion area, making the mask 6 The occlusion area exceeds the display area 11 , Shield to at least part of the inner frame glue 2 On, thus passing UV Light curing outer plastic frame 4 Time, effectively avoid UV Light leaks into the display area 11 In the liquid crystal 3 Produce defects, especially avoid causing premature reaction of reactive monomers in the photo-aligned liquid crystal.

It should be noted that the present invention is provided with inner frame glue 2 And frame glue 4 , Where the inner frame glue 2 Curing is completed after coating, the outer frame 4 Curing after the assembly can effectively avoid the frame glue 2 Insufficient curing degree can cause problems such as uneven cell thickness around the display and liquid crystal puncture.

In summary, the present invention provides a method for manufacturing a liquid crystal display panel, which includes the following steps: S1 Providing a color filter substrate, the color filter substrate including a display area and a non-display area surrounding the display area; step S2 , Coating the inner sealant surrounding the display area on the non-display area, and curing the inner sealant; step S3 、Drop liquid crystal in the display area; step S4 , Coating the outer frame glue surrounding the inner frame glue on the non-display area; step S5 , Providing an array substrate, and combining the array substrate and the color filter substrate into a box; step S6 , Curing the outer frame glue to connect the array substrate and the color film substrate through the outer frame glue, and by coating and curing the inner frame glue before the liquid crystal is dropped, the curing degree of the frame glue can be improved and the liquid crystal can be improved The quality of the display panel to avoid poor display.

As mentioned above, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical solutions and technical ideas of the present invention, and all these changes and modifications shall fall within the protection scope of the claims of the present invention. .

Claims (10)

1. A method for manufacturing a liquid crystal display panel includes the following steps:

   Step S1: Provide a color filter substrate, which includes a display area and a non-display area surrounding the display area;

   Step S2, forming an inner sealant surrounding the display area by coating on the non-display area, and curing the inner sealant;

   Step S3: Drop liquid crystal in the display area;

   Step S4, forming an outer frame rubber surrounding the inner frame rubber by coating on the non-display area;

   Step S5, providing an array substrate, and combining the array substrate and the color filter substrate into a box;

   Step S6: curing the outer frame glue to connect the array substrate and the color filter substrate through the outer frame glue.
2. 8. The method for manufacturing a liquid crystal display panel according to claim 1, wherein in the step S2, the inner sealant is cured by UV light.
3. 5. The method for manufacturing a liquid crystal display panel according to claim 1, wherein the step of curing the outer frame glue in step S6 specifically comprises:

   Disposing a mask on the side of the array substrate away from the color filter substrate, the mask covering the display area;

   Using the mask as a shield, UV light is irradiated to the outer frame glue from a side of the array substrate away from the color filter substrate, so that the outer frame glue is cured.
4. 8. The method of manufacturing a liquid crystal display panel according to claim 3, wherein the mask also shields at least part of the inner sealant.
5. 8. The method of manufacturing a liquid crystal display panel according to claim 1, wherein in step S2, the coating of the inner sealant is completed by a coating machine, and by setting a curing unit on the coating machine, The curing of the inner frame glue is completed.
6. 8. The method for manufacturing a liquid crystal display panel according to claim 5, wherein the curing unit is a UV lamp tube.
7. 8. The method of manufacturing a liquid crystal display panel according to claim 1, wherein the width of the inner frame rubber is smaller than the width of the outer frame rubber.
8. 5. The method for manufacturing a liquid crystal display panel according to claim 1, wherein the inner frame glue and the outer frame glue are arranged at intervals.
9. 8. The method of manufacturing a liquid crystal display panel according to claim 1, wherein the non-display area of the color filter substrate is covered with a black matrix, and the inner frame glue and the outer frame glue are opposite to the black matrix.
10. 8. The method for manufacturing a liquid crystal display panel according to claim 1, wherein the step S2 further comprises coating an alignment film in the display area, and the liquid crystal is dropped on the alignment film in the step S3.