Printing plate, printing apparatus, liquid crystal display panel, and liquid crystal display device

Abstract

The present application relates to a kind of transfer printing plate, transfer printing device, liquid crystal display panel and liquid crystal display device, wherein the transfer printing plate is used to transfer alignment film on the substrate to be transferred, including the main body area consistent with the shape of the substrate to be transferred, at least one corner of the main body area is chamfered along the circumferential direction of the main body area.By setting at least one corner of the main body area as chamfered, the area at at least one corner of the main body area is reduced, thereby reducing the overlapping area of the alignment film formed by the transfer printing plate and the frame glue, and reducing the risk of occurrence of liquid crystal leakage and other problems.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display product manufacturing, and in particular to a transfer plate, a transfer device, a liquid crystal display panel and a liquid crystal display device. BACKGROUND

[0002] The working principle of a liquid crystal display panel is to control the different rotations of liquid crystal molecules by applying driving voltages on two substrates, so as to form different pictures by using the refraction of light energy of a backlight guided by a polarizing plate. However, the front guide of the ordered rotation of the liquid crystal molecules needs to be coated with a uniform PI (Polyimide) alignment film on the surface of the glass to provide a riveting force for the rotation of the liquid crystal molecules.

[0003] There are two ways to coat the PI alignment film on the substrate in the industry at present: a spraying type and a transfer type. Compared with the spraying type PI alignment film coating method, the transfer type PI alignment film coating method prints the PI on the substrate by means of a transfer plate (APR plate) wrapped on a transfer roller, which has the advantage of better control of PI precision, especially when the market trend is towards the demand for products without frames, and this method can also better help the design of narrow edge width products.

[0004] Under the current situation of rapid development of the display industry, the demand for narrow frame of TFT-LCD liquid crystal display is higher. A narrower frame will compress the margin of the peripheral design. In order to ensure the quality of PI liquid printing, the PI and the sealant (frame glue) overlap inevitably.

[0005] The polarity of the surface of the alignment film is quite different from that of the frame glue. When the frame glue and the alignment film are in contact, the surface adhesion will be reduced, and the product end will show problems such as liquid leakage, reliability failure, and falling bubbles. SUMMARY

[0006] In order to solve the above technical problems, the present application provides a transfer plate and a transfer device to solve the problem of liquid leakage caused by the overlap of the alignment film and the frame glue.

[0007] In order to achieve the above purpose, the technical solution adopted by the embodiments of the present application is: a transfer plate for transferring an alignment film on a substrate to be transferred, comprising a main body region corresponding to the shape of the substrate to be transferred, and at least one corner of the main body region is chamfered along the circumferential direction of the main body region.

[0008] Optionally, the main body region is a rectangular structure corresponding to the shape of the substrate to be transferred, and the four corners of the main body region are chamfered.

[0009] Optionally, the chamfer is a circular chamfer or a straight-line chamfer.

[0010] Optionally, the plurality of main regions are arranged along a first direction, and the first direction is a short side direction of the main regions or a long side direction of the main regions.

[0011] The embodiment of the present application also provides a transfer printing device.

[0012] The embodiment of the present application also provides a liquid crystal display panel, which comprises a first substrate and a second substrate arranged oppositely, a liquid crystal layer between the first substrate and the second substrate, and a sealant surrounding the liquid crystal layer, and the liquid crystal layer is sealed in a sealed space formed by the first substrate, the second substrate and the sealant.

[0013] The liquid crystal display device also comprises an alignment film formed by the transfer printing device, and the first substrate and / or the second substrate is provided with the alignment film close to the liquid crystal layer, and the orthographic projection of the alignment film on the first substrate partially overlaps the orthographic projection of the sealant on the first substrate.

[0014] Optionally, the first substrate and the second substrate are rectangular, the alignment film is rectangular and conforms to the shape of the first substrate, and the orthographic projection of the corner of the alignment film on the first substrate is located on one side of the orthographic projection of the sealant on the first substrate, or the orthographic projection of the corner of the alignment film on the first substrate partially overlaps the orthographic projection of the sealant on the first substrate.

[0015] Optionally, the first substrate comprises a central display area and a non-display area located at the periphery of the central display area, the first substrate is rectangular, and the shortest distance between the connecting point of two adjacent sides of the central display area and the corresponding corner of the alignment film is greater than or equal to 500 um.

[0016] Optionally, the transfer printing device comprises a plurality of main regions arranged along a first direction, and the first direction is a short side direction of the main regions or a long side direction of the main regions.

[0017] The sealant comprises two first side walls opposite in the first direction and two second side walls opposite in a second direction perpendicular to the first direction, the overlapping width of the first side wall and the alignment film in the first direction is a first width, the overlapping width of the second side wall and the alignment film in the second direction is a second width, and the first width is greater than the second width.

[0018] The embodiment of the present application also provides a liquid crystal display device comprising the liquid crystal display panel.

[0019] The present application has the beneficial effect that by setting at least one corner of the main area as a chamfer, the area at the at least one corner of the main area is reduced, thereby reducing the overlapping area of the alignment film formed by the transfer printing plate and the frame glue, and reducing the risk of occurrence of liquid crystal leakage and other problems. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic diagram showing the relative position of the alignment film and the frame glue in the related art;

[0021] Figure 2 A schematic diagram showing the main area of the transfer printing plate in the embodiment of the present application Figure 1 ;

[0022] Figure 3 A schematic diagram showing the local structure of the transfer printing plate in the embodiment of the present application Figure 1 ;

[0023] Figure 4 A schematic diagram showing the relative position of the alignment film and the frame glue in the embodiment of the present application Figure 1 ;

[0024] Figure 5 A schematic diagram showing the main area of the transfer printing plate in the embodiment of the present application Figure 2 ;

[0025] Figure 6 A schematic diagram showing the relative position of the alignment film and the frame glue in the embodiment of the present application Figure 2 ;

[0026] Figure 7 A schematic diagram showing the local structure of the transfer printing plate in the embodiment of the present application Figure 2 . DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] Reference Figures 2-6 The present embodiment provides a transfer plate for transferring a alignment film 1 on a substrate to be transferred, comprising a main body area 10 conforming to the shape of the substrate to be transferred, at least one corner of the main body area 10 is chamfered along the circumferential direction of the main body area 10.

[0030] The chamfered corner can reduce the area of the corner of the main body area 10, thereby reducing the area of the corner of the alignment film 1 formed by transfer, and further reducing the overlapping area of the alignment film 1 and the sealant 2, and reducing the risk of problems such as liquid leakage caused by the reduction of the adhesion of the sealant 2 due to the overlap of the alignment film 1 and the sealant 2.

[0031] It should be noted that the polarity of the surface of the alignment film 1 is greatly different from that of the sealant 2, and when the sealant 2 contacts the alignment film 1, the adhesion of the surface of the sealant 2 will be reduced, and the product will show problems such as liquid leakage, reliability failure, and drop Bubble, and the four corners of the product are the most concentrated positions, and improving the adhesion of the four corners can greatly improve the performance of the product, and reference Figure 1 In the present embodiment, by chamfering at least one corner of the main body area 10, Figure 4 and Figure 6 compared with Figure 1 In the present embodiment, the four corners of the main body area 10 are chamfered, Figure 4 and Figure 6 In the present embodiment, the overlapping area of the alignment film 1 and the sealant 2 is less than Figure 1 the overlapping area of the alignment film 1 and the sealant 2 in the present embodiment, thereby improving the problem of the reduction of the surface adhesion of the sealant 2 caused by the large overlapping area of the alignment film 1 and the sealant 2, thereby reducing the risk of liquid leakage.

[0032] It should be noted that the substrate to be transferred is generally rectangular and has four corners, and the main body area 10 is a rectangular structure conforming to the shape of the substrate to be transferred, in order to effectively improve the adhesion of the corners, in an embodiment, the four corners of the main body area 10 are chamfered.

[0033] In exemplary embodiments, the chamfer is a circular arc chamfer or a straight line chamfer. Figure 2 In exemplary embodiments, the corner of the body region 10 is a circular arc chamfer, Figure 5 In exemplary embodiments, the corner of the body region 10 is a straight line chamfer.

[0034] It should be noted that, Figure 2 In exemplary embodiments, the chamfer radius of the four corners of the body region 10 is the same, but it is not limited thereto. For example, the chamfer radius of the four corners of the body region 10 can be partially the same or completely different. Similarly, Figure 5 In exemplary embodiments, the chamfer angle of the four corners of the body region 10 is the same, but it is not limited thereto. For example, the chamfer angle of the four corners of the body region 10 can be partially the same or completely the same. The angle of the four corners can be set according to actual needs, for example, it can be 30-60 degrees, and specifically it can be 45 degrees, but it is not limited thereto.

[0035] In exemplary embodiments, the transfer plate includes a plurality of body regions 10 arranged along a first direction, and the first direction is the short side extension direction of the body region 10 or the long side extension direction of the body region 10, as shown in Figure 3 and Figure 7 .

[0036] In some embodiments, a plurality of substrates to be transferred are located on a mother board. If a plurality of one-to-one corresponding independent transfer plates are provided corresponding to the plurality of substrates to be transferred, a large number of transfer plates are required, which reduces the transfer efficiency. Therefore, in the present embodiment, a plurality of body regions 10 are provided on one transfer plate to simultaneously transfer a plurality of substrates to be transferred on one mother board, thereby improving the transfer efficiency.

[0037] The transfer plate includes a plurality of body regions 10 arranged along a first direction, and the transfer plate is a one-piece structure. Therefore, the chamfer of the corner in the circumferential direction of each body region 10 is provided, and a corresponding notch is formed at the joint of the adjacent two body regions 10.

[0038] In exemplary embodiments, one transfer plate corresponds to one row or one column of substrates to be transferred on one mother board, but it is not limited thereto.

[0039] In the case of an array substrate to be transferred, the first end of the array substrate is a bonding end (the right end in Figure 4 and Figure 6 is a bonding end), and the first direction is parallel to the length extension direction of the first end. In this way, the length of the body region 10 in the second direction perpendicular to the first direction can be shortened, thereby reducing the overlapping area of the part of the alignment film 1 formed by the transfer plate at the first end and the corresponding sealant 2.

[0040] In an exemplary embodiment, a plurality of substrates to be transferred are arranged on a mother board, the transfer plate comprises a plurality of main areas 10 arranged in an array, and the plurality of main areas 10 correspond to the plurality of substrates to be transferred one by one, that is, one transfer plate corresponds to one mother board, and the transfer efficiency is improved by transferring the plurality of substrates to be transferred on one mother board at one time. In this embodiment, the corners of each main area 10 are hollowed out to form a chamfer structure, so as to reduce the area of the corners of the main area 10, thereby reducing the area of the corners of the alignment film 1 formed by transfer, and further reducing the overlapping area of the alignment film 1 and the sealant 2, and reducing the risk of problems such as liquid leakage caused by the reduction of the adhesion of the sealant 2 due to the overlapping of the alignment film 1 and the sealant 2.

[0041] The present application also provides a transfer device comprising the transfer plate.

[0042] The transfer plate comprises a substrate and a transfer pattern arranged on the substrate, the transfer pattern is composed of a hollow part and an adhering part (for adhering PI liquid), and the transfer device further comprises a printing roller, the transfer plate is wound on the printing roller, the substrate to be transferred is arranged on a transmission platform and horizontally transmitted, when the substrate to be transferred is transmitted below the printing roller, one side edge of the transfer plate just contacts the substrate to be transferred, and then the PI liquid is coated on the substrate to be transferred by the rotation of the printing roller and the horizontal transmission of the transmission platform, so that the PI liquid forms a PI film on the substrate to be transferred.

[0043] The present application also provides a liquid crystal display panel comprising a first substrate and a second substrate arranged oppositely, a liquid crystal layer between the first substrate and the second substrate, and a sealant 2 encapsulating the periphery of the liquid crystal layer, and the liquid crystal layer is sealed in a sealed space formed by the first substrate, the second substrate and the sealant 2.

[0044] The liquid crystal display device further comprises an alignment film 1 formed by the transfer device, the first substrate and / or the second substrate arranged close to the liquid crystal layer is provided with the alignment film 1, and the orthographic projection of the alignment film 1 on the first substrate partially overlaps the orthographic projection of the sealant 2 on the first substrate.

[0045] By setting at least one corner of the main area 10 of the transfer plate as a chamfer, the area of the corner of the alignment film 1 is reduced, the overlapping area of the alignment film 1 and the sealant 2 at the corner is reduced, and the adhesion of the sealant 2 at the corner is improved, thereby preventing the occurrence of problems such as liquid leakage.

[0046] In an exemplary embodiment, the first substrate and the second substrate are rectangular, the alignment film 1 is rectangular in shape corresponding to the first substrate, and a projection of a corner of the alignment film 1 on the first substrate is located on one side of a projection of the sealant 2 on the first substrate, or the projection of the corner of the alignment film 1 on the first substrate partially overlaps the projection of the sealant 2 on the first substrate.

[0047] In an exemplary embodiment, the first substrate includes a central display area 3 and a non-display area located at a periphery of the central display area 3, and the first substrate is rectangular in structure, and a shortest distance between a connection point of two adjacent sides of the central display area 3 and a corresponding corner of the alignment film 1 is greater than or equal to 500 um.

[0048] The above scheme prevents misprinting even if the area of the alignment film 1 is greater than the area of the central display area 3.

[0049] In an exemplary embodiment, the transfer plate includes a plurality of the main areas 10 arranged in a first direction, and the first direction is a short side extension direction of the main area 10 or a long side extension direction of the main area 10.

[0050] The sealant 2 includes two first side walls opposite in the first direction and two second side walls opposite in a second direction perpendicular to the first direction, an overlapping width of the first side wall and the alignment film 1 in the first direction is a first width, and an overlapping width of the second side wall and the alignment film 1 in the second direction is a second width, and the first width is greater than the second width.

[0051] The plurality of the main areas 10 are arranged in the first direction, and in the first direction, two opposite sides of the main area 10 located in a middle area are connected to adjacent main areas 10, and the length of the alignment film 1 formed by transfer in the first direction cannot be changed. In the second direction, the two opposite sides of the main area 10 are exposed and can be appropriately retracted to reduce the length of the alignment film 1 formed by transfer in the second direction, thereby reducing the overlapping area of the alignment film 1 and the sealant 2 in the second direction.

[0052] Before chamfering the corners of the main area 10, the overlapping state of the alignment film 1 formed by transfer and the sealant 2 is shown in the following table, the first substrate is an array substrate, the width of the frame of the first substrate is 0.9 mm, and the width (in the long side extension direction and the short side extension direction) of the part of the alignment film 1 exposed to the central display area 3 of the array substrate is 1.0 mm.

[0053]

[0054] The first substrate is rectangular, comprising a binding end, a first end opposite to the binding end, a second end and a third end adjacent to the binding end, for the binding end, the distance from the edge of the central display area 3 to the sealant 2 is 0.86mm, the width of the sealant 2 is 0.65mm, for the first end, the distance from the edge of the central display area 3 to the sealant 2 is 0.45mm, the width of the sealant 2 is 0.55mm, for the second end or the third end, the distance from the edge of the central display area 3 to the sealant 2 is 0.35mm, the width of the sealant 2 is 0.55mm, from the above table, it can be obtained that for the binding end, the overlapping ratio of the alignment film 1 and the sealant 2 is 14%, while the rest of the ends is 100% overlapping.

[0055] After chamfering at least one corner of the main area 10 of the transfer plate, the overlapping area of the alignment film 1 and the sealant 2 at the corner of the first substrate is effectively reduced, and even zero overlapping of the alignment film 1 and the sealant 2 at the corner of the first substrate can be achieved.

[0056] The adhesion force test of the sealant 2 of 25 liquid crystal display panels is carried out, and the test results of the sealant 2 after chamfering and without chamfering are as follows

[0057] Sealant 2 strength test No chamfer Chamfer design Defect rate 7 / 25 NG (not good) 25 / 25 OK (good) Max (maximum) 187N 200N Ave (average) 147N 183N Min (minimum) 64N 156N

[0058] It should be noted that the above test results are obtained by needle test, the first substrate is an array substrate, the second substrate is a color film substrate, the area of the color film substrate is smaller than that of the array substrate, the part of the array substrate exposed to the color film substrate is tested by needle force, for the display panel comprising the alignment film 1 formed by the transfer of the transfer plate without chamfering, the maximum bearing force is 187N (i.e. more than 187N, the first array substrate and the color film substrate will be peeled off), while the display panel comprising the alignment film 1 formed by the transfer of the transfer plate with chamfering, the maximum bearing force is 200N, obviously, after chamfering, the overlapping area of the alignment film 1 formed by transfer and the sealant 2 is reduced, and the adhesion force is obviously increased.

[0059] The embodiment of the present application also provides a liquid crystal display device comprising the above-mentioned liquid crystal display panel.

[0060] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. A transfer plate for transferring an alignment film onto a substrate to be transferred, wherein the substrate to be transferred is a first substrate in a liquid crystal display panel, the liquid crystal display panel further includes a second substrate disposed opposite to the first substrate, the liquid crystal display panel further includes a liquid crystal layer located between the first substrate and the second substrate, and an encapsulating adhesive surrounding the liquid crystal layer, characterized in that... The main body region includes a shape that conforms to the substrate to be transferred. Along the circumferential direction of the main body region, at least one corner of the main body region is chamfered, such that the corner of the alignment film formed by the transfer plate is located on the side of the orthogonal projection of the sealant on the first substrate, thereby reducing the overlap area between the alignment film formed by the transfer plate and the sealant.

2. The transfer plate according to claim 1, characterized in that, The main body area is a rectangular structure that matches the shape of the substrate to be transferred, and all four corners of the main body area are chamfered.

3. The transfer plate according to claim 1, characterized in that, The chamfer can be a rounded chamfer or a straight chamfer.

4. The transfer plate according to claim 1, characterized in that, It includes a plurality of main body regions arranged along a first direction, wherein the first direction is either the direction in which the short side of the main body region extends or the direction in which the long side of the main body region extends.

5. A transfer device, characterized in that, Includes the transfer plate as described in any one of claims 1-4.

6. A liquid crystal display panel, characterized in that, It includes a first substrate and a second substrate disposed opposite to each other, a liquid crystal layer between the first substrate and the second substrate, and a sealant encapsulating the liquid crystal layer around the liquid crystal layer, wherein the liquid crystal layer is sealed within a sealed space formed by the first substrate, the second substrate and the sealant. The liquid crystal display device further includes an alignment film formed by the transfer device according to claim 5. The alignment film is disposed on the side of the first substrate and / or the second substrate near the liquid crystal layer. The orthographic projection of the corner of the alignment film on the first substrate is located on the side of the orthographic projection of the sealant on the first substrate.

7. The liquid crystal display panel according to claim 6, characterized in that, Both the first substrate and the second substrate are rectangular, and the alignment film is a rectangle that matches the shape of the first substrate. The orthographic projection of the corner of the alignment film onto the first substrate is located on one side of the orthographic projection of the sealant onto the first substrate.

8. The liquid crystal display panel according to claim 6, characterized in that, The first substrate includes a central display area and a non-display area located around the central display area. The first substrate has a rectangular structure, and the shortest distance between the connection point of two adjacent sides of the central display area and the corresponding corner of the alignment film is greater than or equal to 500 μm.

9. The liquid crystal display panel according to claim 6, characterized in that, The transfer plate includes a plurality of main body regions arranged along a first direction, wherein the first direction is either the direction in which the short side of the main body region extends or the direction in which the long side of the main body region extends. The sealing adhesive includes two first sidewalls opposite each other in the first direction and two second sidewalls opposite each other in a second direction perpendicular to the first direction. In the first direction, the overlap width between the first sidewalls and the alignment film is a first width, and in the second direction, the overlap width between the second sidewalls and the alignment film is a second width. The first width is greater than the second width.

10. A liquid crystal display device, characterized in that, Includes the liquid crystal display panel according to any one of claims 6-9.

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