Transfer device and preparation method of display panel

Abstract

The invention discloses a transfer device and a preparation method of a display panel. The transfer device comprises a carrier plate and a transfer head; the carrier plate comprises a central area and an edge area, and the edge area is arranged around the central area; the edge area comprises a plurality of filling positions and a plurality of vacant positions, and a vacant position is arranged between at least part of two adjacent filling positions; the transfer heads are arranged on the carrier plate, the arrangement density of the transfer heads at all positions in the center area is the same, the arrangement density of the transfer heads in the edge area is smaller than that of the transfer heads in the center area, and only filling positions in the edge area are provided with the transfer heads. Through the arrangement of the transfer device, the transfer device is used for transferring the light-emitting elements to the transfer areas of the display panel in batches, the splicing seam between every two adjacent transfer areas is weakened, the recognition degree of human eyes on the splicing seams is reduced, and the display consistency and the display effect of the display panel are improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a transfer device and a method for preparing a display panel. Background Art

[0002] Micro-LED is widely used in the display industry due to its excellent luminous efficiency, lifespan and display effect. Compared with other display technologies, the technical difficulty of Micro-LED is to transfer the LED on the wafer to the driving substrate.

[0003] At present, the most commonly used mass transfer method in Micro-LED technology is stamp transfer. When the screen size is large, multiple transfer areas are generally required for splicing transfer. When the uniformity of the optoelectronic characteristics of the LED wafer, such as brightness, wavelength, and light output angle, is poor, a visible splicing seam will be formed at the splicing boundary, affecting the display effect. Summary of the invention

[0004] The transfer device and the method for preparing the display panel provided in the present application are used to weaken the joint seams and improve the display effect.

[0005] In order to solve the above technical problems, the first technical solution provided in the present application is: providing a transfer device, including a carrier and a transfer head; the carrier includes a central area and an edge area, and the edge area is arranged around the central area; the edge area includes a plurality of filling positions and a plurality of vacant positions, and the vacant positions are provided between at least some adjacent two of the filling positions; the transfer head is provided on the carrier; the arrangement density of the transfer heads at various locations in the central area is the same, the arrangement density of the transfer heads in the edge area is less than the arrangement density of the transfer heads in the central area, and the transfer heads are only provided at the filling positions in the edge area.

[0006] In one embodiment, the shape of the central area is a rectangle; the edge area includes four adjacent side areas, each side of the rectangle away from the inner space of the rectangle forms an adjacent side area, and the length of the adjacent side area is the same as the length of the side of the rectangle corresponding to the adjacent side area; the arrangement modes of the transfer heads in the two adjacent side areas on opposite sides of the rectangle are complementary to each other;

[0007] Preferably, along the direction from the central area to the adjacent area, the arrangement density of the transfer heads in the adjacent area gradually decreases;

[0008] More preferably, the number of the transfer heads in the row direction and / or column direction in the adjacent edge region gradually decreases.

[0009] In one embodiment, the edge region further includes an adjacent corner region, and one adjacent corner region is formed between two adjacent edge regions;

[0010] The transfer heads in the two adjacent corner regions along the first side of the rectangle are arranged in a manner complementary to each other; or, along the second side of the rectangle, the second side is perpendicular to the first side, and the transfer heads in the two adjacent adjacent corner regions are arranged in a manner complementary to each other; or, the transfer heads in the four adjacent corner regions are arranged in a manner complementary to each other;

[0011] Preferably, along the direction from the geometric center of the central area to the adjacent corner area, the arrangement density of the transfer heads in the adjacent corner area gradually decreases;

[0012] More preferably, the number of the transfer heads in the row direction and / or column direction in the adjacent corner region gradually decreases.

[0013] In one embodiment, the arrangement density of the transfer heads in the adjacent area corresponding to the first side of the rectangle is the same as the arrangement density of the transfer heads in the adjacent area corresponding to the second side of the rectangle;

[0014] And / or, the transfer heads in a plurality of adjacent corner regions have the same arrangement density.

[0015] In one embodiment, the shape of the central area is a rectangle; the edge area includes two adjacent side areas, and two opposite sides of the rectangle away from the side of the inner space of the rectangle respectively form an adjacent side area, and the length of the adjacent side area is the same as the length of the side of the rectangle corresponding to the adjacent side area; the arrangement of the transfer heads in the two adjacent side areas complements each other.

[0016] In one embodiment, the shape of the central area is a rectangle; the edge area includes three adjacent side areas, and three of the four sides of the rectangle form an adjacent side area on one side away from the inner space of the rectangle, respectively, and the length of the adjacent side area is the same as the length of the side of the rectangle corresponding to the adjacent side area; the arrangement of the transfer heads in the two adjacent side areas located on opposite sides of the rectangle is complementary to each other.

[0017] In one embodiment, the spacing between two adjacent rows of transfer heads in the edge area is the same as the spacing between two adjacent rows of transfer heads in the central area, and the spacing between two adjacent columns of transfer heads in the edge area is the same as the spacing between two adjacent columns of transfer heads in the central area.

[0018] In order to solve the above technical problems, the second technical solution provided by the present application is: to provide a method for preparing a display panel, comprising: providing a driving substrate; using a first transfer device to transfer light-emitting elements to the driving substrate in batches, the first transfer device being the transfer device described in any one of the above items; wherein the driving substrate comprises a plurality of transfer areas arranged in an array, the transfer area comprises a first area and a second area surrounding the first area, the second area comprises a plurality of setting positions and a plurality of supplementary positions; the first area corresponds to the central area of ​​the transfer device, the setting position corresponds to the filling position of the transfer device, and the supplementary position corresponds to the vacant position of the transfer device; each transfer head of the first transfer device has the light-emitting element; in the nth transfer, the first transfer device is aligned with one of the transfer areas of the driving substrate, transfers a plurality of the light-emitting elements to one of the transfer areas, and a plurality of the supplementary positions are formed in the transfer area; in the n+1th transfer, the first transfer device is aligned with another of the transfer areas of the driving substrate, transfers a plurality of the light-emitting elements to another of the transfer areas, and the supplementary positions of one of the transfer areas adjacent to another of the transfer areas are filled with the light-emitting elements; n is a positive integer and is greater than or equal to 1.

[0019] In one embodiment, the method further includes: using a second transfer device to transfer the light emitting elements to the drive substrate in batches to fill the supplementary positions formed after the light emitting elements are transferred in batches by using the first transfer device.

[0020] In one embodiment, the method further includes: cutting the edge of the driving substrate, and filling the rows and / or columns of the cut edge of the driving substrate with the light emitting elements.

[0021] Beneficial effects of the present application: Different from the prior art, the present application discloses a transfer device and a method for preparing a display panel. The transfer device includes a carrier plate and a transfer head; the carrier plate includes a central area and an edge area, and the edge area is arranged around the central area; the edge area includes a plurality of filling positions and a plurality of vacant positions, and a vacant position is provided between at least some of two adjacent filling positions; the transfer head is provided on the carrier plate, the arrangement density of the transfer heads at various locations in the central area is the same, the arrangement density of the transfer heads in the edge area is less than the arrangement density of the transfer heads in the central area, and only the filling positions in the edge area are provided with transfer heads. By configuring the transfer device as described above, the light-emitting elements are transferred to the transfer area of ​​the display panel in batches using the transfer device as described above, the joint seam between two adjacent transfer areas is weakened, the recognition of the joint seam by the human eye is reduced, and the display consistency and display effect of the display panel are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a partial structural schematic diagram of the first embodiment of the transfer device provided by the present application;

[0024] Figure 2 yes Figure 1 The transfer device shown is a schematic diagram of a top view of the structure viewed from the side of the transfer head;

[0025] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of area A and area B shown;

[0026] Figure 4 yes Figure 2 Schematic diagram of the splicing of adjacent edge regions shown;

[0027] Figure 5 yes Figure 2 Schematic diagram of adjacent corner area splicing shown;

[0028] Figure 6 is a schematic diagram of the top view of the second embodiment of the transfer device provided by the present application as viewed from the transfer head side;

[0029] Figure 7 is a schematic diagram of the top view of the third embodiment of the transfer device provided by the present application as viewed from the side of the transfer head;

[0030] Figure 8 is a schematic structural diagram of a transfer region of a first embodiment of a display panel provided in the present application;

[0031] Fig. 9 yes Figure 8 A schematic diagram of the structure of the transfer area shown;

[0032] Fig.10 yes Figure 8 The schematic diagram of splicing multiple transfer area transfer light-emitting elements is shown;

[0033] Fig.11 is a schematic structural diagram of a transfer region of a second embodiment of a display panel provided by the present application;

[0034] Fig.12 yes Fig.11 The schematic diagram of splicing multiple transfer area transfer light-emitting elements is shown;

[0035] Fig.13is a schematic structural diagram of a transfer region of a third embodiment of a display panel provided in the present application;

[0036] Fig.14 yes Fig.13 The schematic diagram of the structure of the multiple transfer area transfer light-emitting elements spliced ​​together is shown;

[0037] Fig.15 is a schematic diagram of a process for preparing a display panel provided in an embodiment of the present application;

[0038] Fig.16 It is a schematic diagram of the flow structure of an implementation method of transfer processing provided in an embodiment of the present application;

[0039] Fig.17 It is a schematic diagram of the flow structure of another implementation method of the transfer process provided in the embodiment of the present application;

[0040] Fig.18 It is a schematic diagram of the process structure of display panel transfer provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Since a large screen needs to be transferred multiple times and spliced ​​to form a larger display area, the LEDs on the wafers taken by the transfer have regional differences in brightness, wavelength, luminous angle and other photoelectric characteristics; the LEDs on both sides of the border of the splicing area come from different positions on the wafer, and the difference in photoelectric characteristics is reflected in the visual effect as a sudden change of straight line boundaries. The human eye is more sensitive to straight edges and sudden changes, so the existence of splicing seams can be perceived, affecting the display uniformity and display effect. In view of this, the present application provides a transfer device and a method for preparing a display panel.

[0043] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0044] See also Figure 1-Figure 5 , Figure 1 is a partial structural diagram of the first embodiment of the transfer device provided by the present application, Figure 2 yes Figure 1 The transfer device shown is a top view of the structure as viewed from the transfer head side. Figure 3 yes Figure 2 The enlarged structural diagram of the A area and the B area is shown. Figure 4yes Figure 2 The schematic diagram of the adjacent edge region splicing is shown in FIG. Figure 5 yes Figure 2 Schematic diagram of adjacent corner area stitching shown.

[0045] The transfer device 1 provided in the embodiment of the present application includes a carrier 11 and a plurality of transfer heads 12, the transfer head 12 is arranged on the carrier 11, and the plurality of transfer heads 12 are arranged on the same side of the carrier 11. The transfer device 1 is used to transfer the light-emitting element 2. In one embodiment, the transfer head 12 is sticky to adhere to the light-emitting element 2; for example, the material of the transfer head 12 is polydimethylsiloxane (PDMS), and PDMS is sticky. In one embodiment, the transfer head 12 is magnetic and adsorbs the light-emitting element 2 by magnetism. In one embodiment, the light-emitting element 2 is a light-emitting diode (LED). It should be noted that the material of the carrier 11, the material of the transfer head 12, the connection method between the carrier 11 and the transfer head 12, and the principle of the transfer head 12 adsorbing the light-emitting element 2 can be referred to the prior art. The embodiment of the present application is to design the arrangement of the transfer head 12 on the carrier 11.

[0046] The carrier plate 11 includes a central area 111 and an edge area 112. The edge area 112 is disposed around the central area 111. The edge area 112 includes a plurality of filling positions 1121 and a plurality of vacant positions 1122, and a vacant position 1122 is disposed between at least some of two adjacent filling positions 1121.

[0047] A plurality of transfer heads 12 are arranged in the central region 111, and the arrangement density of the transfer heads 12 in each location of the central region 111 is the same. A plurality of transfer heads 12 are arranged in the edge region 112, and only the filling position 1121 in the edge region 112 is provided with a transfer head 12, one filling position 1121 is provided with a transfer head 12, and no transfer head 12 is provided at the vacant position 1122; the arrangement density of the transfer heads 12 in the edge region 112 is less than the arrangement density of the transfer heads in the central region 111. The arrangement density refers to the number of transfer heads 12 per unit area.

[0048] In the embodiment of the present application, the edge region 112 of the carrier 11 is designed to include a filling position 1121 and a vacant position 1122, and a vacant position 1122 is provided between at least two adjacent filling positions 1121, and only the filling position 1121 is designed to be provided with a transfer head 12, so that some positions of the edge region 112 of the carrier 11 are provided with a transfer head 12, and at least two adjacent transfer heads 12 are interspersed with a vacant position 1122, so that the arrangement of the transfer heads 12 in the edge region 112 of the carrier 11 is in a mosaic pattern. The mosaic pattern refers to that some positions (i.e., the filling positions 1121) in the edge region 112 are provided with a transfer head 12, and some positions (i.e., the vacant positions 1122) are not provided with a transfer head 12, and at least some adjacent transfer heads 12 are interspersed with a number of positions without a transfer head 12; the mosaic pattern hereinafter has the same meaning. Compared with the array arrangement of the transfer heads in the edge area, the embodiment of the present application arranges the transfer heads 12 in the edge area in a mosaic pattern. When the light-emitting elements 2 are transferred in batches to the transfer area 31 of the display panel 3 introduced in the subsequent content, the joint seam between two adjacent transfer areas 31 is weakened, thereby reducing the recognition of the joint seam by the human eye and improving the display consistency and display effect of the display panel.

[0049] In one embodiment, the multiple transfer heads 12 in the central area 111 are arranged in an array. The multiple transfer heads 12 are arranged in an array, which means that the multiple transfer heads 12 are arranged in multiple rows and columns, and the distance between any two adjacent rows of transfer heads 12 is the same, and the distance between any two adjacent columns of transfer heads 12 is the same.

[0050] In one embodiment, the transfer heads 12 in the edge region 112 are arranged in an irregular manner, and the transfer heads 12 in the edge region 112 may be arranged in a mosaic pattern.

[0051] In one embodiment, the arrangement density of the transfer heads 12 in the edge area 112 gradually decreases along the direction from the center area 111 to the edge area 112, and the transfer device 1 is used to transfer the light-emitting elements 2 to the display panel 3 in batches, so that the pixel brightness, wavelength, photoelectric characteristics, etc. of the light-emitting elements 2 at the joint between two adjacent transfer areas 31 gradually transition, thereby reducing the human eye's perception of the boundary of the joint and weakening the visual boundary, that is, weakening the joint seam.

[0052] In one embodiment, the spacing between two adjacent rows of transfer heads 12 in the edge area 112 is the same as the spacing between two adjacent rows of transfer heads 12 in the center area 111 , and the spacing between two adjacent columns of transfer heads 12 in the edge area 112 is the same as the spacing between two adjacent columns of transfer heads 12 in the center area 111 .

[0053] In this embodiment, the shape of the central area 111 is a rectangle. The edge area 112 includes four adjacent edge areas 112a. Each side of the rectangle (ie, the central area 111) away from the inner space of the rectangle forms an adjacent edge area 112a, forming four adjacent edge areas 112a.

[0054] The length of the adjacent side region 112a is the same as the length of the side of the rectangle corresponding to the adjacent side region 112a. Specifically, the rectangle includes two mutually parallel first sides O1 and two mutually parallel second sides O2, and the second sides O2 are perpendicular to the first sides O1; the length of the adjacent side region 112a formed by the side of the first side O1 of the rectangle away from the inner space of the rectangle is the same as the length of the first side O1 of the rectangle, and the length of the adjacent side region 112a formed by the side of the second side O2 of the rectangle away from the inner space of the rectangle is the same as the length of the second side O2 of the rectangle.

[0055] The transfer heads 12 in the two adjacent side regions 112a on opposite sides of the rectangle are arranged in a complementary manner. Specifically, the transfer heads 12 in the two adjacent side regions 112a corresponding to the two first sides O1 of the rectangle are arranged in a complementary manner, and the transfer heads 12 in the two adjacent side regions 112a corresponding to the two second sides O2 of the rectangle are arranged in a complementary manner. Each adjacent side region 112a is provided with a plurality of filling positions 1121 and a plurality of vacant positions 1122.

[0056] For example, Figure 3 As shown, region A includes a partial region of the adjacent side region 112a corresponding to a first side O1 of the rectangle (i.e., the central region 111) and a partial center region 111 connected to the partial adjacent side region 112a, region B includes a partial region of the adjacent side region 112a corresponding to another first side O1 of the rectangle (i.e., the central region 111) and a partial center region 111 connected to the partial adjacent side region 112a, and region A and region B are symmetrically arranged along the central axis of the rectangle (i.e., the central region 111), and an arrangement of the transfer head 12 of the adjacent side region 112a in region A is complementary to an arrangement of the transfer head 12 of the adjacent side region 112a in region B.

[0057] In the process of sequentially transferring the light-emitting elements 2 along the row direction or the column direction using the same transfer device 1, during the nth transfer, the transfer device 1 is aligned with a transfer area 31 of the display panel 3, and while transferring multiple light-emitting elements 2 to the transfer area 31, multiple supplementary positions 3122 described in the subsequent content are formed, and the multiple supplementary positions 3122 correspond to multiple vacant positions 1122 of the transfer device 1; during the n+1th transfer, the transfer device 1 is aligned with another transfer area 31 of the display panel 3, and the other transfer area 31 is adjacent to the one transfer area 31, and the arrangement of the transfer heads 12 in the two adjacent side areas 112a located on the opposite sides of the rectangle is designed to complement each other, so that during the process of transferring the light-emitting elements 21 to the other transfer area 31, the supplementary positions 3122 of one transfer area 31 adjacent to another transfer area 31 can be filled with light-emitting elements 2, thereby reducing the differences in pixel brightness, wavelength, photoelectric characteristics, etc. of the light-emitting elements 2 at the joint between the two adjacent transfer areas 31, reducing the human eye's perception of the border of the joint, and weakening the visual border. Wherein, n is a positive integer and is greater than or equal to 1.

[0058] For example, Figure 4 As shown, Figure 4 , a schematic diagram of the structure before and after splicing is shown in which the same transfer device 1 is used to transfer to two adjacent transfer areas 31, and the pattern on the left is recorded as the first transfer, and the pattern on the right is recorded as the second transfer. The arrangement pattern of the light-emitting elements 2 on the right side of the first transfer is the same as the arrangement pattern of the transfer head 12 in the adjacent area 112a on the right side of the transfer device 1, and the arrangement pattern of the light-emitting elements 2 on the left side of the second transfer is the same as the arrangement pattern of the transfer head 12 in the adjacent area 112a on the left side of the transfer device 1. Since the same transfer device 1 is used for transfer, the arrangement modes of the transfer heads 12 in the two adjacent areas 112a on the opposite sides of the rectangle (i.e., the central area 111) are complementary to each other, so that the arrangement pattern of the light-emitting elements 2 on the right side of the first transfer is complementary to the arrangement pattern of the light-emitting elements 2 on the left side of the second transfer, so that the borders adjacent to each other between the first transfer and the second transfer are filled with light-emitting elements 2, weakening the splicing border and improving the display effect.

[0059] In one embodiment, the arrangement density of the transfer heads 12 in the adjacent area 112a of the first side O1 of the corresponding rectangle (ie, the central area 111) is the same as the arrangement density of the transfer heads 12 in the adjacent area 112a of the second side O2 of the corresponding rectangle (ie, the central area 111).

[0060] In one embodiment, the width of the adjacent side region 112a corresponding to the first side O1 of the rectangle (ie, the central region 111) is the same as the width of the adjacent side region 112a corresponding to the second side O2 of the rectangle (ie, the central region 111).

[0061] In one embodiment, the arrangement density of the transfer heads 12 in the adjacent area 112a gradually decreases along the direction from the central area 111 to the adjacent area 112a, so that the pixel brightness, wavelength, photoelectric characteristics, etc. of the light-emitting element 2 corresponding to the adjacent area 112a gradually transition after the transfer, thereby reducing the human eye's perception of the boundary of the splicing point, weakening the splicing seam, and improving the display effect.

[0062] Optionally, along the direction from the central area 111 to the adjacent area 112a, the number of transfer heads 12 in the row direction and / or column direction in the adjacent area 112a gradually decreases, thereby achieving a gradually reduced arrangement density of the transfer heads 12 in the adjacent area 112a. The row direction in the adjacent area 112a is the same as the row direction in the central area 111, and the column direction in the adjacent area 112a is the same as the column direction in the central area 111.

[0063] Exemplarily, the first column of the adjacent area 112a is filled with filling positions 1121, and there are no empty positions between the filling positions 1121, that is, the first column is full of transfer heads 12; there is one empty position 1122 interspersed between every four filling positions 1121 in the second column, that is, there is one empty position 1122 between every four transfer heads 12 in the second column; there is one empty position 1122 interspersed between every three filling positions 1121 in the third column, that is, there is one empty position 1122 between every three transfer heads 12 in the third column. There is one vacant position 1122 between every two filling positions 1121 in the 4th column; there is one vacant position 1122 between every two transfer heads 12 in the 4th column; there is one vacant position 1122 between two adjacent filling positions 1121 in the 5th column, that is, the filling positions 1121 and the vacant positions 1122 are alternately arranged, and each transfer head 12 in the 5th column is alternately arranged with one vacant position 1122; the adjacent There is one vacant position 1122 interspersed between two filling positions 1121, that is, the filling positions 1121 and the vacant positions 1122 are alternately arranged, each transfer head 12 in the 6th column is alternately arranged with one vacant position 1122, and the transfer heads 12 in the 6th column are staggered with the transfer heads 12 in the 5th column; there are two vacant positions 1122 interspersed between two adjacent filling positions 1121 in the 7th column, that is, there are two vacant positions 1122 interspersed between two adjacent transfer heads 12 in the 7th column. 22; there are three vacant positions 1122 between two adjacent filling positions 1121 in the 8th column, that is, there are three vacant positions 1122 between two adjacent transfer heads 12 in the 8th column; there are four vacant positions 1122 between two adjacent filling positions 1121 in the 9th column, that is, there are four vacant positions 1122 between two adjacent transfer heads 12 in the 9th column; the 10th column is all vacant positions 1122, that is, no transfer head 12 is set in the 10th column.

[0064] In one embodiment, the spacing between two adjacent rows of transfer heads 12 in the adjacent area 112a is the same as the spacing between two adjacent rows of transfer heads 12 in the central area 111, and the spacing between two adjacent columns of transfer heads 12 in the adjacent area 112a is the same as the spacing between two adjacent columns of transfer heads 12 in the central area 111.

[0065] Further reading Figure 2 In this embodiment, the edge region 112 also includes an adjacent corner region 112b. One adjacent corner region 112b is formed between two adjacent adjacent edge regions 112a, and four adjacent edge regions 112a cooperate to form a total of four adjacent corner regions 112b. Specifically, one adjacent corner region 112b is defined by an adjacent edge region 112a corresponding to the first side O1 of the rectangle (i.e., the central region 111) and an adjacent edge region 112a corresponding to the second side O2 of the rectangle (i.e., the central region 111).

[0066] The adjacent side region 112a corresponding to the first side O1 of the rectangle (i.e., the central region 111) is recorded as region M, and the adjacent side region 112a corresponding to the second side O2 of the rectangle (i.e., the central region 111) is recorded as region N. The size of the adjacent corner region 112b along the direction perpendicular to the long side of the rectangle is the same as the size of the region M along the direction perpendicular to the long side of the rectangle, and the size of the adjacent corner region 112b along the direction perpendicular to the short side of the rectangle is the same as the size of the region N along the direction perpendicular to the short side of the rectangle.

[0067] In one embodiment, the transfer heads 12 in the two adjacent corner regions 112b along the first side O1 of the rectangle (i.e., the central region 111) are arranged in a complementary manner. When the multiple transfer regions 31 of the display panel 3 are arranged in a row along a direction parallel to the first side O1, the transfer heads 12 in the two adjacent corner regions 112b along the first side O1 of the rectangle (i.e., the central region 111) are arranged in a complementary manner, and the same transfer device 1 is used to transfer the multiple transfer regions 31 arranged in the above manner, and the n+1th transfer is performed, so that the light-emitting element 2 can be filled in the supplementary position 3122 corresponding to the adjacent corner region 112b adjacent to the n+1th transfer. Wherein, n is a positive integer and is greater than or equal to 1.

[0068] In one embodiment, the transfer heads 12 in the two adjacent corner regions 112b along the second side O2 of the rectangle (i.e., the central region 111) are arranged in a complementary manner. When the multiple transfer regions 31 of the display panel 3 are arranged in a row along a direction parallel to the second side O2, the transfer heads 12 in the two adjacent corner regions 112b along the second side O2 of the rectangle (i.e., the central region 111) are arranged in a complementary manner, and the same transfer device 1 is used to transfer the multiple transfer regions 31 arranged in the above manner, and the n+1th transfer is performed, so that the light-emitting element 2 can be filled in the supplementary position 3122 corresponding to the adjacent corner region 112b adjacent to the n+1th transfer. Wherein, n is a positive integer and is greater than or equal to 1.

[0069] In one embodiment, the arrangement of the transfer heads 12 in the four adjacent corner regions 112b complements each other. When the multiple transfer regions 31 of the display panel 3 are arranged in multiple rows along a direction parallel to the first side O1, and in multiple columns along a direction parallel to the second side O2, by making the arrangement of the transfer heads 12 in the four adjacent corner regions 112b of the transfer device 1 complement each other, when the multiple transfer regions 31 arranged in the above manner are transferred using the same transfer device 1, the joints of the four adjacent transfer regions 31 are filled with the light-emitting elements 2, that is, 100% full pixels, thereby reducing the joint seams and improving the display effect.

[0070] For example, Figure 5 As shown, Figure 5, a schematic diagram of the structure before and after splicing is shown in which the same transfer device 1 is used to transfer to four adjacent transfer areas 31, and the pattern in the upper left corner is recorded as the first transfer, the pattern in the upper right corner is recorded as the second transfer, the pattern in the lower left corner is recorded as the third transfer, and the pattern in the lower right corner is recorded as the fourth transfer. The arrangement pattern of the light-emitting element 2 at the lower right corner of the first transfer is the same as the arrangement pattern of the transfer head 12 in the adjacent corner area 112b of the lower right corner of the transfer device 1; the arrangement pattern of the light-emitting element 2 at the lower left corner of the second transfer is the same as the arrangement pattern of the transfer head 12 in the adjacent corner area 112b of the lower left corner of the transfer device 1; the arrangement pattern of the light-emitting element 2 at the upper right corner of the third transfer is the same as the arrangement pattern of the transfer head 12 in the adjacent corner area 112b of the upper right corner of the transfer device 1; and the arrangement pattern of the light-emitting element 2 at the upper left corner of the fourth transfer is the same as the arrangement pattern of the transfer head 12 in the adjacent corner area 112b of the upper left corner of the transfer device 1. Since the same transfer device 1 is used for transfer, the arrangement of the transfer heads 12 in the four adjacent corner areas 112b of the transfer device 1 is designed to complement each other, so that the arrangement pattern of the light-emitting elements 2 at the lower right corner of the first transfer, the arrangement pattern of the light-emitting elements 2 at the lower left corner of the second transfer, the arrangement pattern of the light-emitting elements 2 at the upper right corner of the third transfer, and the arrangement pattern of the light-emitting elements 2 at the upper left corner of the fourth transfer complement each other, so that the adjacent corners of the first transfer, the second transfer, the third transfer and the fourth transfer are filled with light-emitting elements 2, thereby weakening the splicing boundary and improving the display effect.

[0071] In one embodiment, the arrangement density of the transfer heads 12 in the adjacent corner area 112b gradually decreases along the direction from the geometric center of the central area 111 to the adjacent corner area 112b, so that the pixel brightness, wavelength, photoelectric characteristics, etc. of the light-emitting element 2 corresponding to the adjacent corner area 112b gradually transition after the transfer, thereby reducing the human eye's perception of the boundary of the splicing point, weakening the splicing seam, and improving the display effect.

[0072] Optionally, along the direction from the geometric center of the central area 111 to the adjacent corner area 112b, the number of transfer heads 12 in the row direction and / or column direction in the adjacent corner area 112b gradually decreases, thereby achieving a gradually reduced arrangement density of the transfer heads 12 in the adjacent corner area 112b. The row direction in the adjacent corner area 112b is the same as the row direction in the central area 111, and the column direction in the adjacent corner area 112b is the same as the column direction in the central area 111.

[0073] In one embodiment, the spacing between two adjacent rows of transfer heads 12 in the adjacent corner area 112b is the same as the spacing between two adjacent rows of transfer heads 12 in the central area 111, and the spacing between two adjacent columns of transfer heads 12 in the adjacent corner area 112b is the same as the spacing between two adjacent columns of transfer heads 12 in the central area 111.

[0074] In one embodiment, the transfer heads 12 in the plurality of adjacent corner regions 112 b are arranged at the same density, that is, the transfer heads 12 in the four adjacent corner regions 112 b are arranged at the same density.

[0075] It should be noted that by making the arrangement of the transfer heads 12 in the two adjacent side areas 112a located on the opposite sides of the rectangle (i.e., the central area 111) complementary to each other, and the arrangement of the transfer heads 12 in the four adjacent corner areas 112b complementary to each other, when using the transfer device 1 to transfer the light-emitting elements 2 multiple times, the transfer device 1 can be used without distinguishing the direction during transfer, thereby reducing the error rate in the process; the alignment coordinates of the transfer device 1 can be shared without distinguishing the direction, the alignment requirements are lower, the seal transfer process is simpler, the transfer difficulty is reduced, and the transfer efficiency is improved.

[0076] The transfer device 1 provided in the embodiment of the present application is used for transfer, and the edges of the multiple light-emitting elements 2 transferred to the display panel 3 are arranged in a mosaic pattern. The arrangement of the light-emitting elements 2 at the edges and corners in each transfer area 31 is patterned. Specifically, the light-emitting elements 2 are selectively transferred or not transferred at the edges and corners in the transfer area 31, so that the edges form a "sawtooth / burr"-like intersection, that is, the edges are arranged in a mosaic pattern. The "sawtooth / burr" of the adjacent edges of two adjacent transfer areas 31 complement each other and are cross-spliced ​​to reduce the human eye's perception of the splicing seams, thereby eliminating the visual presence of the splicing seams and improving the overall uniformity and display effect.

[0077] See also Figure 6 , Figure 6 It is a schematic diagram of the top structure of the second embodiment of the transfer device provided in the present application as viewed from the transfer head side.

[0078] The structure of the second embodiment of the transfer device 1 is substantially the same as that of the first embodiment of the transfer device 1, except that the number of adjacent edge regions 112a and adjacent corner regions 112b is different. Specifically, in the first embodiment of the transfer device 1, the edge region 112 includes four adjacent edge regions 112a and four adjacent corner regions 112b; while in the second embodiment of the transfer device 1, the edge region 112 includes only two adjacent edge regions 112a.

[0079] In the second embodiment of the transfer device 1, the shape of the central area 111 is a rectangle; the edge area 112 includes two adjacent edge areas 112a. The two opposite sides of the rectangle (i.e., the central area 111) are away from the inner space of the rectangle to form an adjacent edge area 112a, that is, the two opposite sides of the rectangle are designed with "burrs". The length of the adjacent edge area 112a is the same as the length of the side of the rectangle corresponding to the adjacent edge area 112a. The arrangement of the transfer heads 12 in the two adjacent edge areas 112a complements each other. The other two sides of the rectangle are designed without "burrs".

[0080] When the light emitting elements 2 are sequentially transferred along the width direction parallel to the adjacent edge region 112a, the transfer heads 12 in the two adjacent edge regions 112a are designed to be arranged in a complementary manner, and the adjacent boundaries are filled with light emitting elements 2 twice in succession, which is similar to the above Figure 4 The stitching effect shown is similar, weakening the stitching boundary and improving the display effect.

[0081] See also Figure 7 , Figure 7 It is a schematic diagram of the top view of the third embodiment of the transfer device provided in the present application as viewed from the side of the transfer head.

[0082] The structure of the third embodiment of the transfer device 1 is substantially the same as that of the first embodiment of the transfer device 1, except that the number of adjacent edge regions 112a and adjacent corner regions 112b is different. Specifically, in the first embodiment of the transfer device 1, the edge region 112 includes four adjacent edge regions 112a and four adjacent corner regions 112b; while in the third embodiment of the transfer device 1, the edge region 112 includes three adjacent edge regions 112a and two adjacent corner regions 112b.

[0083] In the third embodiment of the transfer device, the shape of the central area 111 is a rectangle. The edge area 112 includes three adjacent edge areas 112a, and three of the four sides of the rectangle are away from the side of the inner space of the rectangle to form an adjacent edge area 112a respectively, and the length of the adjacent edge area 112a is the same as the length of the side of the rectangle corresponding to the adjacent edge area 112a. Three of the four sides of the rectangle are designed with "burrs", and the remaining one of the four sides of the rectangle is designed without "burrs". The arrangement of the transfer heads 12 in the two adjacent edge areas 112a located on opposite sides of the rectangle complements each other.

[0084] The arrangement direction of the two adjacent side regions 112a located on the opposite sides of the rectangle is the first direction. When the light emitting elements 2 are sequentially transferred along a direction parallel to the first direction, the arrangement modes of the transfer heads 12 in the two adjacent side regions 112a located on the opposite sides of the rectangle are designed to complement each other, and the adjacent boundaries are filled with light emitting elements 2 twice in succession, which is similar to the above Figure 4The stitching effect shown is similar, weakening the stitching boundary and improving the display effect.

[0085] See also Figure 8-Figure 14 , Figure 8 is a schematic structural diagram of the transfer area of ​​the first embodiment of the display panel provided by the present application, Fig. 9 yes Figure 8 The schematic diagram of the transfer area shown in FIG. Fig.10 yes Figure 8 The schematic diagram of splicing multiple transfer area transfer light-emitting elements is shown, Fig.11 is a schematic structural diagram of the transfer area of ​​the second embodiment of the display panel provided by the present application, Fig.12 yes Fig.11 The schematic diagram of splicing multiple transfer area transfer light-emitting elements is shown, Fig.13 is a schematic structural diagram of the transfer area of ​​the third embodiment of the display panel provided by the present application, Fig.14 yes Fig.13 The schematic diagram of the structure of multiple transfer area transfer light-emitting elements spliced ​​together is shown.

[0086] The display panel 3 includes a driving substrate 30, and the driving substrate 30 includes a plurality of transfer areas 31 arranged in an array. The specific arrangement of the driving substrate 30 can be referred to the prior art. The transfer area 31 includes a first area 311 and a second area 312 surrounding the first area 311, and the second area 312 includes a plurality of setting positions 3121 and a plurality of supplementary positions 3122. The first area 311 corresponds to the central area 111 of the transfer device 1, the setting position 3121 corresponds to the filling position 1121 of the transfer device 1, and the supplementary position 3122 corresponds to the vacant position 1122 of the transfer device 1.

[0087] In the process of transferring the light emitting element 2 to the transfer area 31 using the transfer device 1, each transfer head 12 of the transfer device 1 is provided with a light emitting element 2, and the light emitting element 2 on the transfer device 1 is transferred to the setting position 3121 in the first area 311 and the second area 312 of the transfer area 31. It should be noted that the setting method of the first area 311 and the second area 312 of the display panel 3 can refer to the first embodiment of the transfer device 1 described above (for example, Fig. 9 As shown in the figure), the arrangement of the central area 111 and the edge area 112 in the second embodiment and the third embodiment.

[0088] In one embodiment, if Figure 8As shown, the multiple transfer regions 31 of the drive substrate 30 are arranged in multiple rows and multiple columns, wherein the number of rows of the multiple transfer regions 31 is greater than or equal to 2 and the number of columns is greater than 2, or the number of rows of the multiple transfer regions 31 is greater than or equal to 2 and the number of columns is greater than or equal to 2, and the structure of the first embodiment of the transfer device 1 can be used for transfer. After the structure of the first embodiment of the transfer device 1 is used for transfer in batches, the effect of splicing the adjacent edges of two adjacent transfer regions 31 in the row direction or column direction is as follows: Figure 4 The effect of the adjacent corners of the four adjacent transfer areas 31 after splicing is as shown; Figure 5 As shown. For example, the number of rows of the plurality of transfer regions 31 is 2 and the number of columns is 3; the arrangement of the plurality of transfer regions 31 adopts the schematic diagram of the transfer device 1 after the structure transfer of the first embodiment. Fig.10 As shown. In another exemplary embodiment, the number of rows of the plurality of transfer regions 31 is 3 and the number of columns is 2. In another exemplary embodiment, the number of rows of the plurality of transfer regions 31 is 3 and the number of columns is 3.

[0089] In one embodiment, if Fig.11 As shown, the multiple transfer regions 31 of the driving substrate 30 are arranged in a row or a column, and the transfer can be performed using the structure of the first embodiment of the transfer device 1, the structure of the second embodiment of the transfer device 1, or the structure of the third embodiment of the transfer device 1. When the transfer is performed using the structure of the second embodiment or the third embodiment of the transfer device 1, the transfer device 1 has two adjacent edge regions 112a located on opposite sides of the central region 111 in parallel with the arrangement direction of the multiple transfer regions 31. It should be noted that, regardless of whether the structure of the first embodiment of the transfer device 1, the structure of the second embodiment of the transfer device 1, or the structure of the third embodiment of the transfer device 1 is used, the effect of splicing the adjacent edges of two adjacent transfer regions 31 is the same as above. Figure 4 shown.

[0090] For example, the plurality of transfer regions 31 of the driving substrate 30 are arranged in a row, and the schematic diagram of the splicing after the structure transfer of the second embodiment of the transfer device 1 is as shown in FIG. Fig.12 As shown, after splicing, the row closest to the upper edge of the driving substrate 30 is full of light-emitting elements 2, and the row closest to the lower edge of the driving substrate 30 is full of light-emitting elements 2. The upper and lower sides of the driving substrate 30 do not need to undergo other transfer processing to meet the display requirements.

[0091] In one embodiment, if Fig.13 As shown, the multiple transfer areas 31 of the driving substrate 30 are arranged in two rows and two columns. The transfer can be performed using the structure of the first embodiment of the transfer device 1 or the structure of the third embodiment of the transfer device 1 .

[0092] For example, Fig.13 The multiple transfer areas 31 shown in the figure are transferred using the structure of the first embodiment of the transfer device 1. The effect of splicing the adjacent edges of two adjacent transfer areas 31 in the row direction is as follows: Figure 4 As shown, the effect of splicing the adjacent edges of two adjacent transfer areas 31 in the column direction is similar to Figure 4 Similar to the above, the effect of splicing the adjacent corners of the four transfer areas 31 is as follows: Figure 5 shown.

[0093] For example, Fig.13 The transfer area 31 shown in the figure adopts the structure of the third embodiment of the transfer device 1 for transfer, and the schematic diagram of splicing after transfer is as follows: Fig.14 Two transfer devices 1 are required in the transfer process, both of which are structures of the third embodiment of the transfer device 1 and are respectively denoted as the first device and the second device.

[0094] The first device is used to transfer the light-emitting element 2 to the two transfer areas 31 of the first row. The first device includes a central area 111 and an edge area 112. The central area 111 is a rectangle. The edge area 112 includes three adjacent side areas 112a and two adjacent corner areas 112b. Two adjacent side areas 112a are respectively corresponding to the two first sides O1 of the rectangle, and one adjacent side area 112a is corresponding to the second side O2 of the rectangle. The two adjacent side areas 112a corresponding to the two first sides O1 and the one adjacent side area 112a corresponding to the second side O2 cooperate to define and form two adjacent corner areas 112b. The arrangement of the transfer heads 12 in the two adjacent side areas 112a corresponding to the two first sides O1 of the first device complements each other.

[0095] The second device is used to transfer the light-emitting element 2 to the two transfer areas 31 of the second row. The second device includes a central area 111 and an edge area 112. The central area 111 is a rectangle. The edge area 112 includes three adjacent side areas 112a and two adjacent corner areas 112b. Two adjacent side areas 112a are respectively provided for two first sides O1 of the rectangle, and one adjacent side area 112a is provided for one second side O2 of the rectangle. The two adjacent side areas 112a corresponding to the two first sides O1 cooperate with one adjacent side area 112a corresponding to the second side O2 to define and form two adjacent corner areas 112b. The arrangement of the transfer heads 12 in the two adjacent side areas 112a corresponding to the two first sides O1 of the second device complements each other.

[0096] The arrangement of the transfer heads 12 in the adjacent area 112a corresponding to the second side O2 of the first device is complementary to the arrangement of the transfer heads 12 in the adjacent area 112a corresponding to the second side O2 of the second device. The arrangement of the transfer heads 12 in the two adjacent corner areas 112b of the first device and the two adjacent corner areas 112b of the second device is complementary to each other; that is, the arrangement of the transfer heads 12 in the four adjacent corner areas 112b formed by the cooperation of the first device and the second device is complementary to each other.

[0097] By designing the structures of the first device and the second device as above, and using the first device and the second device for transfer, the adjacent edge area 112a corresponding to the second side O2 of the first device is away from the upper edge of the drive substrate 30, and the adjacent edge area 112a corresponding to the second side O2 of the second device is away from the lower edge of the drive substrate 30, and finally splicing to form Fig.14 As shown in the schematic diagram, the row closest to the upper edge of the driving substrate 30 after splicing is full of light-emitting elements 2, and the row closest to the lower edge of the driving substrate 30 is full of light-emitting elements 2. The upper and lower sides of the driving substrate 30 do not need to undergo other transfer processing to meet the display requirements.

[0098] See also Fig.15 , Fig.15 It is a schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application.

[0099] The method for preparing a display panel provided in an embodiment of the present application uses the transfer device 1 provided in any of the above embodiments to transfer the light-emitting element 2 to the display panel, specifically comprising:

[0100] Step S01: providing a driving substrate 30 .

[0101] Specifically, the driving substrate 30 includes a plurality of transfer regions 31 arranged in an array. The transfer region 31 includes a first region 311 and a second region 312 surrounding the first region 311 , and the second region 312 includes a plurality of setting positions 3121 and a plurality of supplementary positions 3122 .

[0102] Step S02: using a first transfer device to transfer the light emitting elements 2 to the driving substrate 30 in batches.

[0103] Specifically, the first transfer device is the transfer device 1 provided in any of the above embodiments, and the structural design can refer to the above description. The first area 311 of the drive substrate 30 corresponds to the central area 111 of the first transfer device, the setting position 3121 of the drive substrate 30 corresponds to the filling position 1121 of the first transfer device, and the supplementary position 3122 of the drive substrate 30 corresponds to the vacant position 1122 of the first transfer device.

[0104] In the process of transferring the light-emitting element 2 using the first transfer device, each transfer head 12 on the first transfer device is provided with a light-emitting element 2. During the nth transfer, the first transfer device is aligned with a transfer area 31 of the driving substrate 30, and multiple light-emitting elements 2 are transferred to the transfer area 31, and multiple supplementary positions 3122 are formed in the transfer area 31; during the n+1th transfer, the first transfer device is aligned with another transfer area 31 of the driving substrate 30, and multiple light-emitting elements 2 are transferred to the other transfer area 31, and the supplementary positions 3122 of one transfer area 31 adjacent to another transfer area 31 are filled with light-emitting elements 2, and n is a positive integer and is greater than or equal to 1. The schematic diagram of the splicing formed after the first transfer device is used for the transfer in batches is shown in FIG. Fig.10 , Fig.12 or Fig.14 For details, please refer to the above related content. It should be noted that the above splicing method is edge fuzzy cross splicing. Fig.10 , Fig.12 or Fig.14 These examples are provided for illustration only and are not intended to be limiting.

[0105] By specially designing the arrangement of the transfer heads 12 in the edges and corners of the first transfer device (i.e., the transfer device 1 described in the above embodiment), the arrangement of the light-emitting elements 2 on the driving substrate 30 after the transfer corresponds to the arrangement of the transfer heads 12 on the first transfer device. The edges and corners of the first transfer device are selectively designed with transfer heads 12 (to pick up the light-emitting elements 2) or selectively not designed with transfer heads 12 (not to pick up the light-emitting elements 2), so as to achieve selective picking up of the light-emitting elements 2, and then achieve selective transfer during the stamp transfer process. The light-emitting elements 2 in two adjacent transfer areas 31 are cross-spliced ​​during the transfer process, and can be self-spliced ​​in situ, simplifying the process flow; that is, the structural design of the first transfer device (i.e., the transfer device 1 described in the above embodiment), combined with the stamp transfer process, achieves selective transfer + cross-splicing. The light-emitting elements 2 at the edges or corners of two adjacent transfer areas 31 intersect and complement each other, and the light-emitting elements 2 with different optical parameters are confused, so that the light-emitting elements 2 in the boundary area gradually transition instead of the abrupt straight line boundary; and because the human eye is most sensitive to straight and differentiated boundaries, this weakened non-straight line boundary becomes weaker or disappears in the human eye's perception, eliminating the visual boundary / seam.

[0106] By gradually reducing the arrangement density of the transfer heads 12 in the edge area 112 of the first transfer device (i.e., the transfer device 1 described in the above embodiment) from the center area 111 to the edge area 112, the light-emitting elements 2 in two adjacent transfer areas 31 gradually transition from the light-emitting elements 2 in one transfer area 31 to the light-emitting elements 2 in another transfer area 31, and then the pixel brightness, wavelength, photoelectric characteristics, etc. of one light-emitting element 2 gradually transition to the other light-emitting element 2, forming a weakened non-straight boundary, replacing the abrupt straight boundary. Since the human eye is most sensitive to straight and different boundaries, this weakened non-straight boundary becomes weaker or disappears in the human eye's perception, reducing or eliminating the human eye's perception of the boundary of the seam area, and weakening or eliminating the visual boundary / seam.

[0107] like Fig.10 , Fig.12 or Fig.14 As shown, after the transfer and splicing, at least one row or one column of light-emitting elements 2 among a row of light-emitting elements 2 closest to the upper edge of the driving substrate 30, a row of light-emitting elements 2 closest to the lower edge of the driving substrate 30, a column of light-emitting elements 2 closest to the left edge of the driving substrate 30, and a column of light-emitting elements 2 closest to the right edge of the driving substrate 30 is not fully arranged. In other embodiments, the area on the edge of the driving substrate 30 that is not fully arranged with light-emitting elements 2 needs to be transferred to meet display requirements.

[0108] This application is Fig.10 The schematic diagram after splicing shown is used as an example to introduce the transfer processing steps after splicing.

[0109] See also Fig.16 , Fig.16 It is a flow chart of a transfer process provided in an embodiment of the present application.

[0110] In one embodiment, the edge of the driving substrate 30 is cut, and the rows and / or columns of the edge of the cutting driving substrate 30 are filled with light emitting elements 2 .

[0111] For example, Fig.10 The driving substrate 30 shown includes six transfer regions 31, and the six transfer regions 31 are arranged in two rows and three columns; each transfer region 31 is in the shape of a rectangle, which is defined as a first rectangle; the shape formed by the six transfer regions 31 is in the shape of a rectangle, which is defined as a second rectangle. After all six transfer regions 31 transfer the light-emitting elements 2, the light-emitting elements 2 adjacent to each side of the second rectangle are arranged in a mosaic. The edge of the driving substrate 30 is cut, specifically, the light-emitting elements 2 arranged in a mosaic on each side are cut off, so that the rows and / or columns of the edges of the cut driving substrate 30 are filled with light-emitting elements 2.

[0112] See also Fig.17 , Fig.17 It is a flow chart of another implementation method of the transfer process provided in the embodiment of the present application.

[0113] In one embodiment, the second transfer device is used to transfer the light emitting elements 2 to the driving substrate 30 in batches to fill the supplementary positions 3122 formed after the light emitting elements 2 are transferred in batches by the first transfer device.

[0114] For example, Fig.10 The driving substrate 30 shown includes six transfer areas 31, and the six transfer areas 31 are arranged in two rows and three columns; each transfer area 31 is in the shape of a rectangle, which is defined as a first rectangle; the shape formed by the six transfer areas 31 is in the shape of a rectangle, which is defined as a second rectangle. After all six transfer areas 31 transfer the light-emitting elements 2, the light-emitting elements 2 adjacent to each side of the second rectangle are arranged in a mosaic pattern. The second transfer device is used to transfer the light-emitting elements 2 to the driving substrate 30 in batches to fill the vacant positions in the mosaic pattern at the edge of each side with the light-emitting elements 2, that is, to fill the supplementary positions 3122 formed at the edge after the light-emitting elements 2 are transferred in batches by the first transfer device, so that the rows and / or columns at the edge of the driving substrate 30 are finally filled with light-emitting elements 2. Among them, the specific arrangement of the transfer heads on the second transfer device can be designed according to the arrangement of the transfer heads 12 in the adjacent edge area 112a on the first transfer device; specifically, the arrangement of the transfer heads on the second transfer device is complementary to the arrangement of the transfer heads 12 in the adjacent edge area 112a on the first transfer device, so that when the second transfer device is used for transfer, the light-emitting elements 2 can be filled in the mosaic pattern formed at the edge after transfer by the first transfer device.

[0115] See also Fig.18 , Fig.18 It is a schematic diagram of the process structure of display panel transfer provided in an embodiment of the present application.

[0116] The transfer process of forming multiple light-emitting elements 2 on the display panel is: multiple small areas (bins) are cross-joined at the boundary to form a transfer area (shot), multiple transfer areas (shots) are cross-joined at the boundary to form a screen unit (panel), and multiple screen units (panels) are cross-joined at the boundary to form the final display area (display). In other words, the levels from small to large in the transfer process are: bin, shot, panel, display.

[0117] Each small area (bin) can select multiple areas on multiple wafers (wafer) in areas with closer optical parameters such as LED brightness, wavelength, and emission angle to form a transfer area (shot), and then form a screen unit (panel), and then spliced ​​into the final display area, so that the optical parameters of all LED pixels in the display area are closer, and cross-stitching weakens or eliminates the perception of the boundaries of each level of splicing to the human eye, further improving the display effect.

[0118] When splicing at each level, a blurred edge arrangement can be performed, that is, the transfer device 1 introduced in any of the above embodiments is used for transfer, so that the edge of the light-emitting element 2 is arranged in a mosaic pattern after the transfer. At the bin level, each bin partition comes from a certain area of ​​a wafer, and multiple bins form a shot after splicing; after the shot splicing completes the panel, the mosaic pattern part of the panel edge can be processed by the transfer processing method introduced above to form a straight edge. Although the panel edge is a straight edge, after the above-mentioned cross-stitching transfer, the panel edge and the adjacent panel edge can also form a similar gradual transition, weakening or eliminating the visual splicing seam on the panel edge.

[0119] It should be noted that, when transferring the various levels from small to large, the above-mentioned fuzzy cross stitching can be adopted in a certain level, or in each level, as long as the display effect can be improved to a certain extent.

[0120] At the splicing position of the panel edge, because there are no more shots to complement its edge, a "burr"-like missing edge will be left, that is, the edge is a mosaic pattern. In one embodiment, the outline of the light-emitting element 2 picked up by the transfer device is slightly larger than the shot area, so that the "burr" falls outside the display area during binding. If the "burr" is bound to the process edge of the driving substrate 30, the "burr" will eventually be cut off as the edge of the driving substrate 30 is cut; if the "burr" is not bound to the driving substrate 30, it will remain on the transfer head 12 and be cleaned (after the transfer device 1 is transferred, the light-emitting element 2 left on the transfer head 12 is cleaned before the next transfer).

[0121] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A transfer device, characterized in that: include: The carrier plate comprises a central area and an edge area, wherein the edge area is arranged around the central area; the edge area comprises a plurality of filling positions and a plurality of vacant positions, and the vacant position is arranged between at least two adjacent filling positions; The transfer head is arranged on the carrier; the arrangement density of the transfer heads at various locations in the central area is the same, the arrangement density of the transfer heads in the edge area is less than the arrangement density of the transfer heads in the central area, and the transfer heads are only arranged at the filling positions in the edge area.

2. The transfer device according to claim 1, characterized in that The shape of the central area is a rectangle; the edge area includes four adjacent side areas, each side of the rectangle away from the inner space of the rectangle forms an adjacent side area, and the length of the adjacent side area is the same as the length of the side of the rectangle corresponding to the adjacent side area; the arrangement modes of the transfer heads in the two adjacent side areas on opposite sides of the rectangle are complementary to each other; Preferably, along the direction from the central area to the adjacent area, the arrangement density of the transfer heads in the adjacent area gradually decreases; More preferably, the number of the transfer heads in the row direction and / or column direction in the adjacent edge region gradually decreases.

3. The transfer device according to claim 2, characterized in that The edge region also includes an adjacent corner region, and one adjacent corner region is formed between two adjacent edge regions; The transfer heads in the two adjacent corner regions along the first side of the rectangle are arranged in a manner complementary to each other; or, along the second side of the rectangle, the second side is perpendicular to the first side, and the transfer heads in the two adjacent adjacent corner regions are arranged in a manner complementary to each other; or, the transfer heads in the four adjacent corner regions are arranged in a manner complementary to each other; Preferably, along the direction from the geometric center of the central area to the adjacent corner area, the arrangement density of the transfer heads in the adjacent corner area gradually decreases; More preferably, the number of the transfer heads in the row direction and / or column direction in the adjacent corner region gradually decreases.

4. The transfer device according to claim 3, characterized in that: The arrangement density of the transfer heads in the adjacent side region corresponding to the first side of the rectangle is the same as the arrangement density of the transfer heads in the adjacent side region corresponding to the second side of the rectangle; And / or, the transfer heads in a plurality of adjacent corner regions have the same arrangement density.

5. The transfer device according to claim 1, characterized in that: The shape of the central area is a rectangle; the edge area includes two adjacent side areas, and two opposite sides of the rectangle away from the side of the inner space of the rectangle respectively form an adjacent side area, and the length of the adjacent side area is the same as the length of the side of the rectangle corresponding to the adjacent side area; the arrangement of the transfer heads in the two adjacent side areas complements each other.

6. The transfer device according to claim 1, characterized in that The shape of the central area is a rectangle; the edge area includes three adjacent side areas, and three of the four sides of the rectangle form an adjacent side area on one side away from the inner space of the rectangle, and the length of the adjacent side area is the same as the length of the side of the rectangle corresponding to the adjacent side area; the arrangement of the transfer heads in the two adjacent side areas on opposite sides of the rectangle complements each other.

7. The transfer device according to any one of claims 1 to 6, characterized in that: The spacing between two adjacent rows of transfer heads in the edge region is the same as the spacing between two adjacent rows of transfer heads in the central region, and the spacing between two adjacent columns of transfer heads in the edge region is the same as the spacing between two adjacent columns of transfer heads in the central region.

8. A method for preparing a display panel, characterized in that: include: Providing a drive substrate; Using a first transfer device to transfer the light-emitting elements to the driving substrate in batches, the first transfer device being the transfer device according to any one of claims 1 to 7; The driving substrate includes a plurality of transfer areas arranged in an array, the transfer area includes a first area and a second area surrounding the first area, the second area includes a plurality of setting positions and a plurality of supplementary positions; the first area corresponds to the central area of ​​the transfer device, the setting position corresponds to the filling position of the transfer device, and the supplementary position corresponds to the vacant position of the transfer device; Each transfer head of the first transfer device has the light-emitting element; during the nth transfer, the first transfer device is aligned with a transfer area of ​​the drive substrate, transfers a plurality of the light-emitting elements to the transfer area, and a plurality of the supplementary positions are formed in the transfer area; during the n+1th transfer, the first transfer device is aligned with another transfer area of ​​the drive substrate, transfers a plurality of the light-emitting elements to the other transfer area, and the supplementary positions of one transfer area adjacent to another transfer area are filled with the light-emitting elements; n is a positive integer and is greater than or equal to 1.

9. The method for preparing a display panel according to claim 8, characterized in that: Also includes: The light emitting elements are transferred to the driving substrate in batches by using a second transfer device, so as to fill the supplementary positions formed after the light emitting elements are transferred in batches by using the first transfer device.

10. The method for preparing a display panel according to claim 8, characterized in that: Also includes: The edge of the driving substrate is cut, and the rows and / or columns of the cut edge of the driving substrate are filled with the light emitting elements.

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