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

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

Technical Field

[0001] The present invention relates to the technical field of liquid crystal displays, and in particular to a splicable large-size liquid crystal display and a process method thereof. Background Art

[0002] In recent years, LCD (Liquid Crystal Display) has been increasingly widely used in daily life, especially in the fields of instruments, household goods, and vehicle dashboards, with its advantages of high contrast, low power consumption, and small size (ultra-thin). We often see LCDs used for notifications in the waiting halls and platforms of many domestic and foreign railway and bus stations. However, due to the limited display area and small display content of a single LCD screen, the usual method in this field is to horizontally splice a series of large-size (about 300*400mm) LCDs and try to make them seamless as much as possible.

[0003] like Figure 1 As shown, the frame of the existing large-size LCD display is wide enough because the conductive side has a wiring design connecting the conductive step and the display area in the box, and the horizontal frame is generally designed with a larger width like the bottom frame. When used for splicing, the display effect of the spliced ​​part is not good. Summary of the invention

[0004] In order to solve the technical problems raised by the background technology, the present invention provides a large-size liquid crystal display that can be spliced ​​and a process method thereof. The width of the splicing side is very thin and can be used for horizontal seamless splicing. At the same time, the position of the injection port is redesigned to adapt to the width of the splicing side. 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.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A large-size liquid crystal display that can be spliced, the display comprising an upper frame, a lower frame and side frames, the side frames serving as splicing side frames of the display, used for horizontal splicing of multiple displays, the splicing side frames having a width of 0.6-0.8mm; the upper frame and the lower frame or one of them being a conductive side frame, the conductive side frame having a width of 1.5-2.0mm.

[0007] The liquid crystal injection port of the display is arranged at the edge of the spliced ​​side frame, 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.

[0008] The thickness of the liquid crystal box of the display is 5.0μm-6.0μm, and the spacers in the box are evenly distributed with a density range of 30-50 per square millimeter. The spacers in the liquid crystal box are composed of a mixture of 5.0-5.5μm white silicon ball hard powder and 5.5-6.0μm black plastic soft powder.

[0009] A liquid crystal injection process method for a splicable large-size liquid crystal display comprises the following steps:

[0010] 1) Design the size of the filling port to be 8-10mm, so as not to enter the product viewing area, and retain a depth of 6-8mm;

[0011] 2) Take the process of slow vacuuming and secondary buffering, that is, first vacuumize at a uniform speed for 2-3 hours, keep the pressure in the cavity unchanged for 20-30 minutes, and then continue vacuuming for 2-3 hours to make the pressure in the cavity less than 0.1Pa.

[0012] A manufacturing process for a splicable large-size liquid crystal display comprises the following steps:

[0013] 1) Use ITO conductive film glass as the upper ITO glass substrate and the lower ITO glass substrate, 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;

[0014] 2) Coating 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 type, and the pre-tilt angle is 3-4°; rubbing with a rubbing flannel at a specific angle, with appropriate rubbing conditions, so that grooves are formed in the PI orientation layer;

[0015] 3) Spraying a spacer with a diameter range of 5.0 μm to 6.0 μm on the upper ITO glass substrate coated with the PI orientation layer, uniformly distributed at a density range of 30 to 50 per square millimeter, the spacer being composed of a mixture of 5.0-5.5 μm hard powder and a slightly larger size of 5.5-6.0 μm black plastic soft powder;

[0016] 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;

[0017] 5) Pour liquid crystal around the spacer to fill the liquid crystal cell;

[0018] 6) An upper polarizer is attached to the upper ITO glass substrate surface of the liquid crystal box, and a lower polarizer is attached to the lower ITO glass substrate surface. 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.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) In order to achieve seamless connection between the two spliced ​​screens, we deliberately made the splicing side frame thinner so that the dot matrix display graphics of the two adjacent splicing screens are as close as possible, and the step side frame is thicker to ensure that the overall LCD large screen has sufficient reliability when the conductive side is crimped with the conductive material;

[0021] 2) If the width of the splicing side frame is 0.6-0.8mm, the display graphics on the splicing side will be only about 1.0mm away from the edge of the LCD screen. Then the shape and position of the conventional injection port will completely fail to meet the injection requirements of the liquid crystal box. Therefore, this product moves the injection port position to the edge of the conductive side frame, because the conductive side has a wiring design connecting the conductive step and the display area in the box, so the width is sufficient;

[0022] 3) In order to avoid the problem of dissatisfaction of the injected liquid crystal caused by the design of oversize and marginalization of the injection port, we adopt the following design and process methods: 1. The size of the injection port can be designed to be as large as possible, so as not to enter the product viewing area. It can usually be increased to 8-10mm and retain a depth of 6-8mm. 2. When evacuating before injecting the liquid crystal, the vacuum degree in the box must be small enough but not collapse the liquid crystal box. We can adopt a slow vacuuming and secondary buffering process, that is, first evacuate at a uniform speed for 2-3 hours, keep the pressure in the cavity unchanged for 20-30 minutes, and then continue to evacuate for 2-3 hours, so that the pressure in the cavity is less than 0.1Pa;

[0023] 4) In order to enable the product to be used outdoors or under conditions of large temperature changes, we abandoned the conventional box lining material ratio scheme. At room temperature, the white hard powder and the black soft powder play a supporting role together; when the temperature rises, the liquid crystal box expands, the white hard powder with a smaller powder diameter is suspended in the air, and the black soft powder with a larger powder diameter plays a major supporting role, so that the liquid crystal box will have a more uniform box thickness; when the temperature drops, the liquid crystal box shrinks, the overall box thickness of the liquid crystal box becomes smaller, and the black soft powder with a larger powder diameter is compressed and deformed. When the box thickness reaches the powder diameter of the white hard powder, the two play a supporting role together, with the white hard powder as the main one; in this way, regardless of high or low temperatures, the back of the liquid crystal box will get a better support, thus avoiding the change of background color caused by uneven local support force, which affects the use of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the frame and injection port of a conventional display;

[0025] Figure 2 It is a schematic diagram of the frame and injection port of the LCD liquid crystal display of the present invention (double-sided conductive);

[0026] Figure 3It is a schematic diagram of the frame and injection port of the LCD liquid crystal display of the present invention (single-sided conductive);

[0027] Figure 4 is a schematic diagram of the layered structure of the liquid crystal display of the present invention;

[0028] Figure 5 This is a schematic diagram of the matching of the lining gaskets in a conventional liquid crystal box;

[0029] Figure 6 It is a schematic diagram of the arrangement of the lining gaskets in the liquid crystal box of the present invention.

[0030] In the figure: 1-upper frame 2-lower frame 3-side frame 4-injection port 5-upper polarizer 6-upper ITO glass substrate 7-upper TOP insulating layer 8-upper PI orientation layer 9-liquid crystal 10-lower TOP insulating layer 11-lower PI orientation layer 12-lower ITO glass substrate 13-lower polarizer 14-conventional gasket 15-white hard powder gasket 16-black soft powder gasket 17-conductive step. DETAILED DESCRIPTION

[0031] The specific implementation modes provided by the present invention are described in detail below with reference to the accompanying drawings.

[0032] like Figure 2 As shown, a large-size liquid crystal display that can be spliced ​​includes an upper frame 1, a lower frame 2 and a side frame 3. The side frame 3 is used as a splicing side frame of the display and is used for horizontal splicing of multiple displays. The width of the splicing side frame is 0.6-0.8mm; the upper frame 1 and the lower frame 2 or one of them is a conductive side frame, and the width of the conductive side frame is 1.5-2.0mm;

[0033] like Figure 2-3 As shown, the liquid crystal injection port 4 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 ( Figure 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, Figure 3 Take the lower frame 2 as an example), when the display is conductive on both sides, the number of injection ports is 2 ( Figure 2 , both the upper frame 1 and the lower frame 2 are provided with a conductive step 17, both are conductive side frames).

[0034] The size of the liquid crystal injection port 4 of the display is 8-10 mm.

[0035] like Figure 4As shown, it includes an upper polarizer 5, a liquid crystal box and a lower polarizer 13 arranged from top to bottom. The liquid crystal box is composed of an upper ITO glass substrate 6, an upper TOP protective layer 7, an upper PI orientation layer 8, a liquid crystal layer 9, a lower PI orientation layer 10, a lower TOP protective layer 11, and a lower ITO glass substrate 12 arranged from top to bottom. The upper PI orientation layer 8, the liquid crystal layer 9, and the lower PI orientation layer 10 are sealed between the upper ITO glass substrate 6 and the lower ITO glass substrate 12 by frame glue.

[0036] The liquid crystal layer 9 is a TN mode liquid crystal with a thickness ranging from 5.0 μm to 6.0 μm, and is composed of a spacer and liquid crystal. The spacer is evenly distributed with a density ranging from 30 to 50 per square millimeter. Figure 6 As shown, the spacer is composed of a mixture of 5.0-5.5μm hard powder 15 and a slightly larger black plastic soft powder 16 of 5.5-6.0μm, and is surrounded by liquid crystal; the upper polarizer 5 and the lower polarizer 13 are high-contrast polarizers in the industry; the upper ITO glass substrate 6 and the lower ITO glass substrate 12 are made of ITO conductive film glass, with a thickness range of 0.7mm to 1.1mm and a square resistance range of 15Ω / □ to 30Ω / □. The upper and lower ITO are etched with a special acid solution according to the predetermined pattern, so that the overlapping area is the product display pixel.

[0037] The optical path difference of the liquid crystal cell is Δn*d=500-600nm.

[0038] The transmission axes of the upper polarizer 5 and the lower polarizer 13 are parallel to each other so that the product is in negative display mode when not in use, thus having a higher contrast.

[0039] A liquid crystal injection process method for a splicable large-size liquid crystal display comprises the following steps:

[0040] 1) The size of the filling port 4 is designed to be 8-10 mm, so as not to enter the product viewing area, and a depth of 6-8 mm is reserved;

[0041] 2) Take the process of slow vacuuming and secondary buffering, that is, first vacuumize at a uniform speed for 2-3 hours, keep the pressure in the cavity unchanged for 20-30 minutes, and then continue vacuuming for 2-3 hours to make the pressure in the cavity less than 0.1Pa.

[0042] A manufacturing process for a splicable large-size liquid crystal display comprises the following steps:

[0043] 1) Using ITO conductive film glass as the upper ITO glass substrate 6 and the lower ITO glass substrate 12, 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 a special acid solution according to a predetermined pattern, so that the overlapping area is the product display pixel;

[0044] 2) coating the ITO side of the upper ITO glass substrate 6 and the lower ITO glass substrate 12 with a PI orientation agent, the PI orientation agent being an antistatic type with a pretilt angle of 3-4°; rubbing with a rubbing flannel at a specific angle and matching appropriate rubbing conditions to form grooves in the PI orientation layer;

[0045] 3) Spray a spacer material with a diameter of 5.0 μm to 6.0 μm on the upper ITO glass substrate 6 coated with the PI orientation layer, and evenly distribute it at a density of 30 to 50 per square millimeter. Figure 6 As shown, the liner material is composed of a mixture of a hard powder 15 of 5.0-5.5 μm and a black plastic soft powder 16 of slightly larger size of 5.5-6.0 μm;

[0046] 4) Apply frame glue and leave a filling port 4, and attach the upper ITO glass substrate 6 and the lower ITO glass substrate 12 to form a liquid crystal box;

[0047] 5) Pour liquid crystal around the spacer to fill the liquid crystal cell;

[0048] 6) An upper polarizer 5 is attached to the surface of the upper ITO glass substrate 6 of the liquid crystal box, and a lower polarizer 13 is attached to the surface of the lower ITO glass substrate 12. Both the upper and lower polarizers 13 are high-contrast polarizers in the industry, and the transmission axes of the upper and lower polarizers are parallel to each other.

[0049] In order to achieve seamless connection between two spliced ​​screens, the present invention abandons the design of the frame. Figure 1 Conventional designs such as Figure 2 As shown, we deliberately make the splicing side frame (side frame 3) thinner, with a width of 0.6-0.8mm so that the dot matrix display graphics of two adjacent splicing screens can be as close as possible, and the conductive side frame (upper frame 1 or lower frame 2) is thicker, and the width can be widened to 1.5mm-2.0mm to ensure that the overall LCD large screen has sufficient reliability when the conductive step 17 is crimped with the conductive material.

[0050] In addition, if the width of the splicing side frame 3 is 0.6-0.8mm, the splicing side display graphics will be only about 1.0mm away from the edge of the LCD screen. Figure 1 The shape and position of the conventional filling port 4 shown will completely fail to meet the filling requirements of the liquid crystal box, so the present invention moves the filling port 4 to the edge of the product step.

[0051] In order to avoid the problem of dissatisfaction of the injected liquid crystal caused by the design of oversize and marginalization of the injection port, we adopt the following design and process methods: 1. The size of the injection port can be designed to be as large as possible, so as not to enter the product viewing area. It can usually be increased to 8-10mm and retain a depth of 6-8mm. 2. When evacuating before injecting the liquid crystal, the vacuum degree in the box must be small enough but not collapse the liquid crystal box. We can adopt a slow vacuuming and secondary buffering process, that is, first evacuate at a uniform speed for 2-3 hours, keep the pressure in the cavity unchanged for 20-30 minutes, and then continue to evacuate for 2-3 hours, so that the pressure in the cavity is less than 0.1Pa;

[0052] In order to use the product outdoors or under conditions with large temperature changes, we gave up Figure 5 The conventional box liner 14 ratio scheme shown in the figure adopts Figure 6 In the mixed gasket solution shown, the white hard powder 15 and the black soft powder 16 play a supporting role together at room temperature; when the temperature rises, the liquid crystal box expands, the white hard powder 15 with a smaller powder diameter is suspended, and the black soft powder 16 with a larger powder diameter plays a major supporting role, so that the liquid crystal box has a more uniform box thickness; when the temperature drops, the liquid crystal box shrinks, the overall box thickness of the liquid crystal box becomes smaller, and the black soft powder 16 with a larger powder diameter is compressed and deformed. When the box thickness reaches the powder diameter of the white hard powder 15, the two play a supporting role together, with the white hard powder 15 as the main one. In this way, regardless of high or low temperatures, the liquid crystal box will get a better support, avoiding the change of the background color caused by the uneven local support force, which affects the use of the product.

[0053] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments 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, wherein 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.

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