CN111142286B

CN111142286B - A splicable large-size liquid crystal display and its process method

Info

Publication number: CN111142286B
Application number: CN202010122254.6A
Authority: CN
Inventors: 刘威
Original assignee: Anshan Yes Optoelectronics Display Co ltd
Current assignee: Anshan Yes Optoelectronics Display Co ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2025-05-06
Anticipated expiration: 2040-02-27
Also published as: CN111142286A

Abstract

A large-size liquid crystal display that can be spliced, the display includes an upper frame, a lower frame and a side frame, the side frame is used as a splicing side frame of the display, and is used for horizontal splicing of multiple displays, and the width of the splicing side frame is 0.6-0.8mm; the upper frame and the lower frame or one of them is a conductive side frame, and the width of the conductive side frame is 1.5-2.0mm. The liquid crystal injection port of the display is arranged at the edge of the splicing side frame and adjacent to the conductive side frame. The gasket in the liquid crystal box of the display is evenly distributed in a density range of 30 to 50 per square millimeter, and the gasket in the liquid crystal box is composed of a mixture of 5.0-5.5μm white silicon ball hard powder and 5.5-6.0μm black plastic soft powder. The width of the splicing side is very thin, and can be used for horizontal seamless splicing; at the same time, in order to adapt to the width of the splicing side, the position of the injection port is redesigned. In addition, the large-size liquid crystal display also overcomes the problem of uneven background color caused by the overall change of the box thickness when the outdoor temperature changes.

Description

Spliced large-size liquid crystal display and process method thereof

Technical Field

The invention relates to the technical field of liquid crystal displays, in particular to a spliced large-size liquid crystal display and a process method thereof.

Background

In recent years, LCDs (Liquid CRYSTAL DISPLAY Liquid crystal displays) have been increasingly used in daily life, particularly in the fields of instruments, household products, vehicle instrument panels, and the like, by virtue of advantages such as high contrast, low power consumption, small volume (ultra-thin), and the like. We often see a liquid crystal display for notification at waiting halls and platforms at many train stations and bus stations at home and abroad. However, because the display area of a single liquid crystal display is limited and the display content is small, a common method in the field is to transversely splice a series of large-size (about 300 mm) liquid crystal displays, and seamless splicing is achieved as much as possible.

As shown in fig. 1, the width of the frame of the conventional large-sized lcd is enough because the conductive side has a wiring design for connecting the conductive steps and the display area in the box, and the width of the same design of the transverse frame and the bottom frame is generally larger, so that the display effect of the spliced portion is not good when the frame is used for splicing.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides a large-size liquid crystal display capable of being spliced and a process method thereof, wherein the width of a spliced side is very thin, the large-size liquid crystal display can be used in a transversely seamless splicing manner, and the position of a filling opening is redesigned in order to adapt to the width of the spliced side. And the large-size liquid crystal display also solves the problem of uneven ground color caused by overall thickness change of the box when outdoor temperature changes.

In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:

The large-size liquid crystal display capable of being spliced comprises an upper frame, a lower frame and side frames, wherein the side frames are used as splicing side frames of the display and used for transversely splicing a plurality of displays, the width of each splicing side frame is 0.6-0.8mm, one or the upper frame and the lower frame is a conductive side frame, and the width of each conductive side frame is 1.5-2.0mm.

The liquid crystal filling openings of the display are arranged at the edge of the spliced side frame and adjacent to the conductive side frame, the number of the filling openings is 1 when the display is conductive on one side, and the number of the filling openings is 2 when the display is conductive on two sides.

The thickness of the liquid crystal box of the display is 5.0-6.0 mu m, the packing materials in the box are uniformly distributed in a density range of 30-50 per square millimeter, and the packing materials in the liquid crystal box are formed by mixing white silicon ball hard powder with the thickness of 5.0-5.5 mu m and black plastic soft powder with the thickness of 5.5-6.0 mu m.

A liquid crystal filling process method of a large-size liquid crystal display capable of being spliced comprises the following steps:

1) The size of the filling opening is designed to be 8-10mm, the filling opening is determined to be not advanced into a product visual area, and the depth of 6-8mm is reserved;

2) The process method of slow vacuumizing and secondary buffering is adopted, namely, the vacuum is firstly pumped at a constant speed for 2-3 hours, the pressure in the cavity is kept unchanged for 20-30 minutes, and then the vacuum is continuously pumped for 2-3 hours, so that the pressure in the cavity is less than 0.1Pa.

A manufacturing process method of a large-size liquid crystal display capable of being spliced comprises the following steps:

1) The method comprises the steps of adopting ITO conductive film glass as an upper ITO glass substrate and a lower ITO glass substrate, wherein the glass thickness range is 0.7 mm-1.1 mm, the sheet resistance range of the ITO conductive film is 15 omega/≡30 omega/≡, and etching the upper ITO and the lower ITO with special acid liquor according to a preset pattern respectively to enable the overlapping area to be a product display pixel;

2) Coating PI orientation agent on the ITO side of the upper ITO glass substrate and the lower ITO glass substrate, wherein the PI orientation agent is antistatic, the pretilt angle is 3-4 degrees, and friction is carried out by using friction flannelette at a specific angle, and proper friction conditions are matched to enable the PI orientation layer to form grooves;

3) Spraying spacer materials with the diameter range of 5.0-6.0 mu m on the ITO glass substrate coated with the PI alignment layer, wherein the spacer materials are uniformly distributed in the density range of 30-50 per square millimeter, and the spacer materials are formed by mixing hard powder with the diameter range of 5.0-5.5 mu m and black plastic soft powder with the slightly larger size of 5.5-6.0 mu m;

4) Coating frame glue, leaving a filling opening, and attaching an upper ITO glass substrate and a lower ITO glass substrate to form a liquid crystal box;

5) Filling liquid crystal around the spacer to fill the liquid crystal box;

6) An upper polaroid is attached to the surface of an upper ITO glass substrate of the liquid crystal box, a lower polaroid is attached to the surface of a lower ITO glass substrate, the upper polaroid and the lower polaroid both adopt high-contrast polaroids in industry, and transmission axes of the upper polaroid and the lower polaroid are parallel to each other.

Compared with the prior art, the invention has the beneficial effects that:

1) In order to realize seamless butt joint between two spliced screens, a spliced side frame is thinned, so that dot matrix display patterns of two adjacent spliced screens are as close as possible, and a step side frame is thickened, and the whole LCD large screen has enough reliability when a conductive side is in press connection with a conductive material;

2) If the width of the spliced side frame is 0.6-0.8mm, the display graph of the spliced side is about 1.0mm away from the edge of the LCD screen, the conventional filling opening shape and position can not meet the filling requirement of the liquid crystal box, so that the product moves the filling opening position to the edge of the conductive side frame, and the width is enough because the conductive side is provided with a wiring design for connecting the conductive step and the display area in the box;

3) In order to avoid the problems of insufficient filling liquid crystal possibly caused by oversized filling port and marginal filling port, the following design and process method are adopted, namely 1, the size of the filling port can be designed to be as large as possible, the filling port can be generally increased to 8-10mm and the depth of 6-8mm is reserved based on a product visual area, 2, when the liquid crystal is filled, the vacuum degree in the liquid crystal box is small enough and the liquid crystal box cannot be collapsed by vacuum pumping, the liquid crystal box can be slowly vacuumized and buffered for the second time, namely, the liquid crystal box is vacuumized at a constant speed for 2-3 hours, the pressure in the cavity is kept unchanged for 20-30 minutes, and then vacuumized for 2-3 hours, so that the pressure in the cavity is smaller than 0.1Pa;

4) In order to realize outdoor use or use under the condition of larger temperature change of a product, a conventional box lining padding proportioning scheme is abandoned, white hard powder and black soft powder play a supporting role together at normal temperature, when the temperature is increased, a liquid crystal box is expanded, white hard powder with smaller powder diameter is suspended, black soft powder with larger powder diameter plays a main supporting role, so that the liquid crystal box has a more uniform box thickness, when the temperature is reduced, the liquid crystal box is contracted, the whole box thickness of the liquid crystal box is reduced, the black soft powder with larger powder diameter is pressed and deformed, when the box thickness reaches the powder diameter of the white hard powder, the white hard powder is taken as the main material, thus the liquid crystal box can be better supported at no matter at high temperature or low temperature, and the influence on the use of the product due to the ground color change caused by uneven local supporting force is avoided.

Drawings

FIG. 1 is a schematic diagram of a bezel and a perfusion opening of a conventional display;

FIG. 2 is a schematic diagram of a frame and a filling port (double-sided conduction) of an LCD liquid crystal display according to the present invention;

FIG. 3 is a schematic view of a frame and a filling port (single side conductive) of an LCD liquid crystal display according to the present invention;

FIG. 4 is a schematic diagram of a layered structure of a liquid crystal display according to the present invention;

FIG. 5 is a schematic diagram of a conventional liquid crystal cell liner arrangement;

FIG. 6 is a schematic illustration of the alignment of the liquid crystal cell liner gasket of the present invention.

In the figure, the upper frame 2-the lower frame 3-the side frame 4-the pouring opening 5-the upper polarizer 6-the upper ITO glass substrate 7-the upper TOP insulating layer 8-the upper PI alignment layer 9-the liquid crystal 10-the lower TOP insulating layer 11-the lower PI alignment layer 12-the lower ITO glass substrate 13-the lower polarizer 14-the conventional spacer 15-the white hard powder spacer 16-the black soft powder spacer 17-the conductive step.

Detailed Description

The following detailed description of the embodiments of the invention is provided with reference to the accompanying drawings.

As shown in FIG. 2, the display comprises an upper frame 1, a lower frame 2 and a side frame 3, wherein the side frame 3 is used as a splicing side frame of the display and used for transversely splicing a plurality of displays, and the width of the splicing side frame is 0.6-0.8mm;

As shown in fig. 2-3, the liquid crystal filling openings 4 of the display are arranged at the edge of the spliced side frame and adjacent to the conductive side frame, when the display is single-side conductive, the number of filling openings is 1 (fig. 3, one of the upper frame 1 and the lower frame 2 is provided with a conductive step 17, which is a conductive side frame, and fig. 3, the lower frame 2 is an example), and when the display is double-side conductive, the number of filling openings is2 (fig. 2, both the upper frame 1 and the lower frame 2 are provided with conductive steps 17, which are conductive side frames).

The size of the liquid crystal filling opening 4 of the display is 8-10mm.

As shown in fig. 4, the liquid crystal display device comprises an upper polarizer 5, a liquid crystal box and a lower polarizer 13 which are arranged from TOP to bottom, wherein the liquid crystal box is composed of an upper ITO glass substrate 6, an upper TOP protective layer 7, an upper PI alignment layer 8, a liquid crystal layer 9, a lower PI alignment layer 10, a lower TOP protective layer 11 and a lower ITO glass substrate 12 which are arranged from TOP to bottom, and the upper PI alignment layer 8, the liquid crystal layer 9 and the lower PI alignment layer 10 are sealed between the upper ITO glass substrate 6 and the lower ITO glass substrate 12 through frame glue.

The liquid crystal layer 9 is TN-mode liquid crystal, the thickness range is 5.0-6.0 mu m, the liquid crystal layer is composed of spacers and liquid crystal, the spacers are uniformly distributed in the density range of 30-50 spacers per square millimeter, as shown in figure 6, the spacers are composed of hard powder 15 with the thickness of 5.0-5.5 mu m and black plastic soft powder 16 with the slightly larger size of 5.5-6.0 mu m in a mixed mode, the periphery is filled with the liquid crystal, the upper polaroid 5 and the lower polaroid 13 are high-contrast polaroids in the industry, the upper ITO glass substrate 6 and the lower ITO glass substrate 12 are made of ITO conductive film glass, the thickness range is 0.7-1.1 mm, and the square resistance range is 15 omega/-30 omega/- (. Etching the upper ITO and the lower ITO with special acid liquor according to a preset pattern respectively to enable the overlapped area to be a product display pixel.

The optical path difference of the liquid crystal box is delta n x d=500-600 nm.

The transmission axes of the upper polarizer 5 and the lower polarizer 13 are parallel to each other, so that the product is in a negative display mode when not in use, and thus, the contrast ratio is higher.

1) The size of the pouring opening 4 is designed to be 8-10mm, the product is not entered into the product visual area, and the depth of 6-8mm is reserved;

1) An ITO conductive film glass is adopted as an upper ITO glass substrate 6 and a lower ITO glass substrate 12, the glass thickness range is 0.7 mm-1.1 mm, the sheet resistance range of the ITO conductive film is 15 omega/≡to 30 omega/≡, and the upper ITO and the lower ITO are respectively etched by special acid liquor according to a preset pattern, so that the overlapping area is a product display pixel;

2) Coating PI orientation agent on the ITO side of the upper ITO glass substrate 6 and the lower ITO glass substrate 12, wherein the PI orientation agent is antistatic, the pretilt angle is 3-4 degrees, and friction flannelette is used for friction at a specific angle, and proper friction conditions are matched to enable the PI orientation layer to form grooves;

3) Spraying spacers with the diameter range of 5.0-6.0 mu m on the upper ITO glass substrate 6 coated with the PI alignment layer, wherein the spacers are uniformly distributed in the density range of 30-50 per square millimeter, and the spacers are formed by mixing hard powder 15 with the diameter range of 5.0-5.5 mu m and black plastic soft powder 16 with the slightly larger size of 5.5-6.0 mu m as shown in figure 6;

4) Coating frame glue, leaving a filling opening 4, and attaching an upper ITO glass substrate 6 and a lower ITO glass substrate 12 to form a liquid crystal box;

5) Filling liquid crystal around the spacer to fill the liquid crystal box;

6) An upper polaroid 5 is attached to the surface of an upper ITO glass substrate 6 of the liquid crystal box, a lower polaroid 13 is attached to the surface of a lower ITO glass substrate 12, the upper polaroid 13 and the lower polaroid 13 are high-contrast polaroids in industry, and transmission axes of the upper polaroid and the lower polaroid are parallel to each other.

In the invention, in order to realize seamless joint between two spliced screens, the conventional design of FIG. 1 is abandoned, as shown in FIG. 2, the spliced side frames (side frames 3) are thinned, the width is 0.6-0.8mm, so that dot matrix display patterns of two adjacent spliced screens are as close as possible, the conductive side frames (upper frames 1 or lower frames 2) are thickened, the width can be widened to 1.5-2.0 mm, and the whole LCD large screen has enough reliability when the conductive step 17 is crimped with conductive materials.

In addition, if the width of the splicing side frame 3 is 0.6-0.8mm, the distance between the splicing side display graph and the edge of the LCD screen is only about 1.0mm, and then the shape and the position of the conventional filling opening 4 as shown in fig. 1 can not meet the filling requirement of the liquid crystal box, so that the position of the filling opening 4 is moved to the edge of a product step.

In order to avoid the problems of insufficient filling liquid crystal possibly caused by oversized filling port and marginal filling port, the following design and process method are adopted, namely 1, the size of the filling port can be designed to be as large as possible, the filling port can be generally increased to 8-10mm and the depth of 6-8mm is reserved based on a product visual area, 2, when the liquid crystal is filled, the vacuum degree in the liquid crystal box is small enough and the liquid crystal box cannot be collapsed by vacuum pumping, the liquid crystal box can be slowly vacuumized and buffered for the second time, namely, the liquid crystal box is vacuumized at a constant speed for 2-3 hours, the pressure in the cavity is kept unchanged for 20-30 minutes, and then vacuumized for 2-3 hours, so that the pressure in the cavity is smaller than 0.1Pa;

In order to realize outdoor use or use under the condition of larger temperature change of the product, the conventional scheme of proportioning the box lining pad 14 shown in fig. 5 is abandoned, the mixed lining pad scheme shown in fig. 6 is adopted, the white hard powder 15 and the black soft powder 16 jointly play a supporting role at normal temperature, when the temperature is increased, the liquid crystal box is expanded, the white hard powder 15 with smaller powder diameter is suspended, the black soft powder 16 with larger powder diameter plays a main supporting role, so that the liquid crystal box has a more uniform box thickness, when the temperature is reduced, the liquid crystal box is contracted, the whole box thickness of the liquid crystal box is reduced, the black soft powder 16 with larger powder diameter is deformed by pressing, and when the box thickness reaches the powder diameter of the white hard powder 15, the two jointly play a supporting role, and the white hard powder 15 is taken as the main role. Therefore, no matter the temperature is high or low, the liquid crystal box can be well supported, and the influence on the use of products due to the change of the ground color caused by uneven local supporting force is avoided.

The above examples are implemented on the premise of the technical scheme of the present invention, and detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the above examples. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. A large-size liquid crystal display that can be spliced, characterized in that the display comprises an upper frame, a lower frame and a side frame, the side frame is used as a splicing side frame of the display, and is used for horizontal splicing of multiple displays, and the width of the splicing side frame is 0.6-0.8mm; the upper frame and the lower frame or one of them is a conductive side frame, and the width of the conductive side frame is 1.5-2.0mm;

The liquid crystal injection port of the display is arranged at the edge of the spliced side frame and adjacent to the conductive side frame. When the display is unilaterally conductive, the number of injection ports is 1, and when the display is bilaterally conductive, the number of injection ports is 2;

The thickness of the liquid crystal box of the display is 5.0 μm-6.0 μm, and the spacers in the box are evenly distributed in a density range of 30 to 50 per square millimeter. The spacers in the liquid crystal box are composed of a mixture of 5.0-5.5 μm white silicon ball hard powder and 5.5-6.0 μm black plastic soft powder;

In order to achieve seamless connection between two spliced screens, the spliced side frame is made thinner so that the dot matrix display graphics of the two adjacent spliced screens are as close as possible, and the step side frame is made thicker to ensure that the overall LCD large screen has sufficient reliability when the conductive side is crimped with the conductive material;

The size of the filling port is designed to be 8-10mm, so as not to enter the product viewing area, and retain a depth of 6-8mm.

2. A large-size liquid crystal display that can be spliced according to claim 1, characterized in that the manufacturing process of the display comprises the following steps:

1) Use ITO conductive film glass as the upper and lower ITO glass substrates, the glass thickness range is 0.7mm~1.1mm, the ITO conductive film square resistance range is 15Ω/□~30Ω/□, and the upper and lower ITO are etched with special acid solution according to the predetermined pattern, so that the overlapping area is the product display pixel;

2) Apply PI orientation agent on the ITO side of the upper ITO glass substrate and the lower ITO glass substrate. The PI orientation agent is antistatic and has a pretilt angle of 3-4°. Rub with a rubbing flannel to form grooves in the PI orientation layer.

3) Spray a spacer with a diameter range of 5.0μm to 6.0μm on the upper ITO glass substrate coated with the PI orientation layer, evenly distributed at a density range of 30 to 50 per square millimeter. The spacer is composed of a mixture of 5.0-5.5μm hard powder and a slightly larger size of 5.5-6.0μm black plastic soft powder;

4) Apply frame glue and leave a filling port, and bond the upper ITO glass substrate and the lower ITO glass substrate to form a liquid crystal box;

5) Pour liquid crystal around the gasket to fill the liquid crystal box;

6) An upper polarizer is attached to the surface of the upper ITO glass substrate of the liquid crystal box, and a lower polarizer is attached to the surface of the lower ITO glass substrate. Both the upper and lower polarizers are high-contrast polarizers in the industry, and the transmission axes of the upper and lower polarizers are parallel to each other.