Panel attaching alignment method and alignment target
By setting asymmetrical alignment targets in a color cholesterol liquid crystal display and manufacturing multiple panels using the same photomask, the problem of precise alignment of medium and large-sized panels is solved, achieving efficient and low-cost bonding.
Patent Information
- Application Number
- CN202411039732.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-05-19
- Filing Date
- 2024-07-31
- Publication Date
- 2025-11-21
AI Technical Summary
Existing technologies make it difficult to achieve precise bonding and avoid panel damage or contamination in the manufacturing of medium and large-sized color cholesteric liquid crystal displays, especially the alignment target interference problem of the middle panel, and the additional photomask manufacturing cost is high.
By setting asymmetrical alignment targets on the panel, multiple panels can be manufactured using the same photomask. Precise alignment and bonding can be achieved through symmetrical and asymmetrical combinations of specific corner targets and offset targets, avoiding the use of additional photomasks.
It achieves precise alignment and bonding of medium and large-sized panels, avoiding panel damage and contamination, reducing costs, and improving the accuracy of alignment and bonding.
Smart Images
Figure CN120993634A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a panel alignment method and alignment target, in particular, a panel alignment method and alignment target by the same mask. BACKGROUND
[0002] A color cholesteric liquid crystal display is composed of multiple single-color cholesteric liquid crystal panels. How to precisely align the single-color cholesteric liquid crystal panels is a very important issue in the manufacturing process of the color cholesteric liquid crystal display.
[0003] Specifically, a smaller panel can be thinned to facilitate the alignment target to be clearly captured by the camera of the aligning equipment. However, the panel strength is low after thinning the glass substrate, and the panel is easily damaged when being picked up or touched. Therefore, this method cannot be applied to medium or large-sized panels.
[0004] Furthermore, in the case of aligning and bonding medium or large-sized panels without thinning the panel thickness, the alignment target of the panel arranged in the middle easily interferes with the camera of the aligning equipment to capture the alignment target of the panel arranged in the bottom layer or the top layer. Therefore, two methods are used to solve the above problem in the prior art. One method is to remove the alignment target of the panel arranged in the middle by laser or chemical agent before bonding, but this method is easy to cause damage or contamination of the panel. The other method is to manufacture the panel arranged in the middle by an additional mask to cancel the alignment target, but this method needs to invest in an expensive additional mask.
[0005] Therefore, it is an important and urgent problem in the industry to develop a panel alignment method and alignment target that can achieve precise alignment and bonding of panels without additional processing and avoid contamination and damage to the panel. SUMMARY
[0006] The present disclosure provides a panel alignment method and alignment target, which achieves the effect of manufacturing multiple panels by the same mask and precise alignment and bonding by making one of the alignment targets asymmetric with the other three. The first and second regions on the alignment target are arranged to improve the precision of the alignment and bonding of the panel.
[0007] A method for aligning and bonding panels is provided. The method comprises the following steps: generating four alignment targets on each of a plurality of panels by a mask, wherein the panels comprise a first panel, a second panel, and a third panel, the alignment targets are located at four corners of each panel, the alignment targets are a first corner target, a second corner target, a third corner target, and an offset target, the first corner target and the second corner target are symmetrical, the second corner target and the third corner target are symmetrical, and the offset target is asymmetrical to the first corner target, the second corner target, and the third corner target; aligning and bonding the first panel and the second panel to form a double-layer panel, wherein the second panel is rotated 180 degrees compared to the first panel, the first corner target of the first panel is aligned with the third corner target of the second panel, and the third corner target of the first panel is aligned with the first corner target of the second panel; and aligning and bonding the double-layer panel and the third panel to form a triple-layer panel, wherein the second corner target of the first panel is aligned with the second corner target of the third panel, and the offset target of the first panel is aligned with the offset target of the third panel.
[0008] The method for aligning and bonding panels according to the preceding embodiment, wherein the panels can further comprise a fourth panel.
[0009] The method for aligning and bonding panels according to the preceding embodiment, further comprising the following steps: aligning and bonding the triple-layer panel and the fourth panel to form a quadruple-layer panel, wherein the fourth panel is rotated 180 degrees compared to the first panel and the third panel, the offset target of the second panel is aligned with the offset target of the fourth panel, and the second corner target of the second panel is aligned with the second corner target of the fourth panel.
[0010] The method for aligning and bonding panels according to the preceding embodiment, wherein aligning and bonding the first panel and the second panel to form the double-layer panel, aligning and bonding the double-layer panel and the third panel to form the triple-layer panel, and aligning and bonding the triple-layer panel and the fourth panel to form the quadruple-layer panel can all be performed by at least two cameras, and the cameras can be arranged above or below the double-layer panel, the triple-layer panel, and the quadruple-layer panel.
[0011] The method for aligning and bonding panels according to the preceding embodiment, wherein the number of the cameras can be four, two of the cameras are arranged above the double-layer panel, the triple-layer panel, and the quadruple-layer panel, and the other two of the cameras are arranged below the double-layer panel, the triple-layer panel, and the quadruple-layer panel.
[0012] The method for aligning and bonding panels according to the preceding embodiment, wherein the first panel, the second panel, the third panel, and the fourth panel can be cholesterol liquid crystal panels.
[0013] The panel assembly alignment method according to the previous embodiment, wherein the first panel, the second panel, the third panel and the fourth panel can be different color panels.
[0014] The panel assembly alignment method according to the previous embodiment, wherein the first panel, the second panel, the third panel and the fourth panel can each include a display area, and the alignment target is located in a region other than the display area.
[0015] An alignment target according to an embodiment of the present disclosure is provided, which is disposed on a panel and includes a first region and at least a second region. The first region is surrounded by a plurality of boundaries. The second region is located within the first region, wherein the second region allows light to penetrate, and other regions of the first region excluding the second region prohibit light from penetrating. The distance between the second region and a boundary of the first region is less than or equal to 0.02 mm.
[0016] The alignment target according to the previous embodiment, wherein the material of the first region can be metal.
[0017] The alignment target according to the previous embodiment, wherein the number of the second regions can be five, and the second regions are respectively located at four corners and a center position of the alignment target.
[0018] The alignment target according to the previous embodiment, wherein the shape of the first region can be cross-shaped, and the shape of the second region can be circular.
[0019] The alignment target according to the previous embodiment, wherein the diameter of the second region can be less than 0.18 mm.
[0020] The alignment target according to the previous embodiment, wherein the length of the boundary can be less than or equal to 0.18 mm. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 A flowchart of a panel assembly alignment method according to an embodiment of the present disclosure is shown;
[0022] Figure 2 A schematic diagram of a mask according to an embodiment of the present disclosure is shown; Figure 1
[0023] A schematic diagram of a first panel according to an embodiment of the present disclosure is shown; Figure 3 Figure 1 A schematic diagram of a second panel according to an embodiment of the present disclosure is shown;
[0024] Figure 4 Figure 1 A schematic diagram of a third panel according to an embodiment of the present disclosure is shown;
[0025] Figure 5 A schematic diagram of a fourth panel according to an embodiment of the present disclosure is shown; Figure 1 Schematic diagram of the third panel in the embodiment;
[0026] Figure 6 Schematic diagram of the alignment of the first panel and the second panel in the embodiment; Figure 1 Schematic diagram of the fourth panel in the embodiment;
[0027] Figure 7 Schematic diagram of the alignment of the double-layer panel and the third panel in the embodiment; Figure 1 Schematic diagram of the alignment of the triple-layer panel and the fourth panel in the embodiment;
[0028] Figure 8 Schematic diagram of the alignment of the double-layer panel and the third panel in the embodiment; Figure 1 Schematic diagram of the alignment of the triple-layer panel and the fourth panel in the embodiment;
[0029] Figure 9 Schematic diagram of the alignment of the double-layer panel and the third panel in the embodiment; Figure 1 Schematic diagram of the alignment of the triple-layer panel and the fourth panel in the embodiment; and
[0030] Figure 10 Schematic diagram of the alignment of the double-layer panel and the third panel in the embodiment; Figure 1 Schematic diagram of the alignment of the triple-layer panel and the fourth panel in the embodiment; and
[0031] Wherein, the reference signs are explained as follows:
[0032] S100: panel alignment and bonding method
[0033] S101, S102, S103, S104: steps
[0034] 110: photomask
[0035] 111, 112, 113, 114: target
[0036] 121: first panel
[0037] 122: second panel
[0038] 123: third panel
[0039] 124: fourth panel
[0040] 131: first corner target
[0041] 132: second corner target
[0042] 133: third corner target
[0043] 134: offset target
[0044] 135: display area
[0045] 140: camera
[0046] 151: first area
[0047] 152: Second Region
[0048] 153: Boundary
[0049] DA: Diameter of the second region
[0050] DS: Distance between the boundary of the second region and the first region
[0051] PD: Length of the boundary Detailed Implementation
[0052] Please refer to Figure 1 The diagram illustrates a flowchart of a panel bonding and alignment method according to one embodiment of this disclosure. Figure 1 It can be seen that the panel bonding and alignment method S100 includes steps S101, S102, and S103.
[0053] Please refer to Figures 2 to 5 ,in Figure 2 Drawing according to Figure 1 A schematic diagram of the photomask in the embodiment. Figure 3 Drawing according to Figure 1 A schematic diagram of the first panel in the embodiment. Figure 4 Drawing according to Figure 1 A schematic diagram of the second panel in the embodiment. Figure 5 Drawing according to Figure 1 A schematic diagram of the third panel in the embodiment. Figures 1 to 5 It is known that step S101 includes generating four alignment targets on each of the multiple panels using photomask 110. The panels include a first panel 121, a second panel 122, and a third panel 123. The alignment targets are located at the four corners of each panel (i.e., the first panel 121, the second panel 122, and the third panel 123), and the alignment targets are a first corner target 131, a second corner target 132, a third corner target 133, and an offset target 134.
[0054] Furthermore, the first corner target 131 is symmetrical to the second corner target 132, and the second corner target 132 is symmetrical to the third corner target 133. However, the offset target 134 is asymmetrical to all three corner targets. In other words, the offset target 134 is offset from its original position symmetrical to the first corner target 131 and the third corner target 133.
[0055] Please refer to Figure 6 Its drawing is based on Figure 1 A schematic diagram of the fourth panel in the embodiment. Figure 6It is understood that the panel may further include a fourth panel 124, and the first corner target 131, the second corner target 132, the third corner target 133, and the offset target 134 are respectively located at the four corners of the fourth panel 124. Furthermore, the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124 may each be a cholesteric liquid crystal panel, and the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124 may be panels of different colors, wherein the first panel 121 may be a blue cholesteric liquid crystal panel, the second panel 122 may be a green cholesteric liquid crystal panel, the third panel 123 may be a red cholesteric liquid crystal panel, and the fourth panel 124 may be a black cholesteric liquid crystal panel. Figures 3 to 6 B, G, R, and K are used to represent blue, green, red, and black, respectively, but are not limited to these. Furthermore, the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124 can all be formed by photolithography.
[0056] Depend on Figure 2 It can be seen that multiple targets 111, 112, 113, and 114 are set on the photomask 110, and the target 114 is asymmetrical with the targets 111, 112, and 113. The individual positions of the targets 111, 112, 113, and 114 correspond to the individual positions of the first corner target 131, the second corner target 132, the third corner target 133, and the offset target 134 of the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124, respectively.
[0057] Depend on Figures 3 to 6 It is known that the first panel 121, the second panel 122, the third panel 123 and the fourth panel 124 may each include a display area 135, and the alignment targets (i.e. the first corner target 131, the second corner target 132, the third corner target 133 and the offset target 134) are located in areas outside the display area 135.
[0058] Please refer to Figure 7 Its drawing is based on Figure 1 A schematic diagram illustrating the alignment and bonding of the first and second panels in this embodiment. Figure 1 and Figure 7 It is understood that step S102 includes aligning and bonding the first panel 121 and the second panel 122 to form a double-layer panel, wherein the second panel 122 is rotated 180 degrees relative to the first panel 121, the first corner target 131 of the first panel 121 is aligned with the third corner target 133 of the second panel 122, and the third corner target 133 of the first panel 121 is aligned with the first corner target 131 of the second panel 122, and a double-layer panel is formed after bonding.
[0059] Please refer toFigure 8 Fig. 2 illustrates a schematic diagram of aligning and bonding a double-layer panel with a third panel according to an embodiment of the present application. Figure 1 Fig. 3 illustrates a schematic diagram of aligning and bonding a three-layer panel with a fourth panel according to an embodiment of the present application. Figure 1 Fig. 4 illustrates a schematic diagram of aligning and bonding a four-layer panel with a fifth panel according to an embodiment of the present application. Figure 8 It is known that the panel bonding alignment method S100 can further comprise step S103, and step S103 comprises aligning and bonding the double-layer panel with the third panel 123 to form a three-layer panel, wherein the second corner target 132 of the first panel 121 is aligned with the second corner target 132 of the third panel 123, the offset target 134 of the first panel 121 is aligned with the offset target 134 of the third panel 123, and the three-layer panel is formed after bonding. It must be pointed out that the offset target 134 of the second panel 122 does not affect and interfere with the alignment of the second corner target 132 of the first panel 121 and the second corner target 132 of the third panel 123, and the second corner target 132 of the second panel 122 does not affect and interfere with the alignment of the offset target 134 of the first panel 121 and the offset target 134 of the third panel 123.
[0060] Please refer to Figure 9 Fig. 2 illustrates a schematic diagram of aligning and bonding a double-layer panel with a third panel according to an embodiment of the present application. Figure 1 Fig. 3 illustrates a schematic diagram of aligning and bonding a three-layer panel with a fourth panel according to an embodiment of the present application. Figure 1 Fig. 4 illustrates a schematic diagram of aligning and bonding a four-layer panel with a fifth panel according to an embodiment of the present application. Figure 9 It is known that the panel bonding alignment method S100 can further comprise step S103, and step S103 comprises aligning and bonding the double-layer panel with the third panel 123 to form a three-layer panel, wherein the second corner target 132 of the first panel 121 is aligned with the second corner target 132 of the third panel 123, the offset target 134 of the first panel 121 is aligned with the offset target 134 of the third panel 123, and the three-layer panel is formed after bonding. It must be pointed out that the offset target 134 of the second panel 122 does not affect and interfere with the alignment of the second corner target 132 of the first panel 121 and the second corner target 132 of the third panel 123, and the second corner target 132 of the second panel 122 does not affect and interfere with the alignment of the offset target 134 of the first panel 121 and the offset target 134 of the third panel 123.
[0061] Fig. 4 illustrates a schematic diagram of aligning and bonding a four-layer panel with a fifth panel according to an embodiment of the present application. Figures 7 to 9It is known that the first panel 121 and the second panel 122 are aligned and attached to form a double-layer panel, the double-layer panel and the third panel 123 are aligned and attached to form a triple-layer panel, and the triple-layer panel and the fourth panel 124 are aligned and attached to form a quadruple-layer panel, which can be photographed by at least two cameras 140, and the cameras 140 are arranged above or below the double-layer panel, the triple-layer panel, and the quadruple-layer panel. Further, the number of cameras 140 can be four, two of the cameras 140 are arranged above the double-layer panel, the triple-layer panel, and the quadruple-layer panel, and the other two of the cameras 140 are arranged below the double-layer panel, the triple-layer panel, and the quadruple-layer panel. The number of cameras 140 depends on the process requirements and is not limited thereto.
[0062] Furthermore, the attachment order of the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124 can be from top to bottom or from bottom to top, and the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124 can all have a thickness of 0.2mm to 0.5mm and an area of 13.3 inches to 27.6 inches, but are not limited thereto.
[0063] It must be pointed out that Figures 7 to 9 The offset target 134 in the X-shaped and more prominent offset position is presented to emphasize that the alignment and attachment will not be interfered or interfere with other alignment targets, and the actual offset target 134 and the first corner target 131, the second corner target 132, and the third corner target 133 are also cross-shaped on the panel, as shown in the schematic of Figures 3 to 6 Furthermore, the offset target 134 can also be X-shaped or other shapes different from the first corner target 131, the second corner target 132, and the third corner target 133 in Figures 7 to 9 , so as to achieve the effect of avoiding interference or interference with other alignment targets during alignment.
[0064] Please refer to Figure 10 , which shows a schematic diagram of alignment targets in accordance with Figure 1 an embodiment. From Figure 10It is known that the alignment target (not labeled in the figure) includes a first region 151 and a plurality of second regions 152. The first region 151 is surrounded by a plurality of boundaries 153, and the second regions 152 are located in the first region 151. The second regions 152 allow light to pass through, and the other regions of the first region 151 excluding the second regions 152 prohibit light from passing through. In addition, the distance DS between the second regions 152 and the boundaries 153 of the first region 151 is less than or equal to 0.02 mm. The distance DS between the second regions 152 and the boundaries 153 of the first region 151 can be further between 0.01 mm and 0.02 mm. In addition, the alignment target is arranged on a panel. Specifically, by the second regions 152, the alignment target can avoid completely shielding the passing of the coaxial light source.
[0065] Figure 10 The alignment target can be the first corner target 131, the second corner target 132, the third corner target 133, and the offset target 134 of the first panel 121, the second panel 122, the third panel 123, and the fourth panel 124, and the targets 111, 112, 113, and 114 arranged on the mask 110.
[0066] The material of the first region 151 can be metal, and the length PD of the boundary 153 can be less than or equal to 0.18 mm. The number of boundaries 153 of the first region 151 can be a plurality, and the lengths of the respective boundaries 153 can be the same. Specifically, the above-mentioned values are determined according to the exposure, development, and etching processes of the lithography process, and are also related to the lens magnification of the camera 140 and the field of view that can be provided.
[0067] The number of second regions 152 can be five, wherein the second regions 152 are respectively located at the four corners and a center position of the alignment target. In addition, the shape of the first region 151 can be a cross shape, and the shape of the second regions 152 can be a circular shape, and the diameter DA of the second regions 152 can be less than 0.18 mm, but the number and shape are not limited to the above.
[0068] In detail, Figure 10 In the above-mentioned embodiment, the distance DS between the second regions 152 and the boundaries 153 of the first region 151 is 0.015 mm, the diameter DA of the second regions 152 is 0.15 mm, and the length PD of the boundaries 153 is 0.18 mm.
[0069] In summary, the panel alignment method of the present disclosure can achieve the effect of forming four panels by the same mask and realizing precise alignment, wherein the alignment targets on the diagonal lines of the panels do not cause interference problems during the alignment process, and the panel alignment method can be further applied to panels of different sizes. In this way, not only can the process and cost be saved, but also the problem of causing mask damage or contaminating the panel can be solved. Furthermore, the alignment targets of the present disclosure can further improve the alignment effect, and during the alignment and bonding process, the camera can receive clearer alignment mark images, thereby improving the precision of the aligned and bonded panels.
[0070] Although the present application has been disclosed with examples as above, it is not intended to limit the present application, and anyone with ordinary knowledge in the art can make some changes and modifications without departing from the spirit and scope of the present application, so the protection scope of the present application shall be subject to the appended claims.
Claims
1. A panel fit alignment method, characterized by, Comprising: generating four pairs of alignment targets on each of a plurality of panels by a mask, wherein the plurality of panels comprises a first panel, a second panel and a third panel, the four pairs of alignment targets are located at four corners of each of the panels respectively, the four pairs of alignment targets are a first corner target, a second corner target, a third corner target and an offset target respectively, the first corner target and the second corner target are symmetrical, the second corner target and the third corner target are symmetrical, wherein the offset target is asymmetrical to the first corner target, the second corner target and the third corner target; aligning and bonding the first panel and the second panel to form a double-layer panel, wherein the second panel is rotated 180 degrees compared to the first panel, the first corner target of the first panel is aligned with the third corner target of the second panel, the third corner target of the first panel is aligned with the first corner target of the second panel, to form the double-layer panel after bonding; and aligning and bonding the double-layer panel and the third panel to form a triple-layer panel, wherein the second corner target of the first panel is aligned with the second corner target of the third panel, the offset target of the first panel is aligned with the offset target of the third panel, to form the triple-layer panel after bonding.
2. The panel attach alignment method of claim 1, wherein, The four pairs of alignment targets are generated on each of the plurality of panels by the mask, the plurality of panels further comprises a fourth panel.
3. The panel attach alignment method of claim 2, wherein, Further comprising: aligning and bonding the triple-layer panel and the fourth panel to form a quadruple-layer panel, wherein the fourth panel is rotated 180 degrees compared to the first panel and the third panel, the offset target of the second panel is aligned with the offset target of the fourth panel, the second corner target of the second panel is aligned with the second corner target of the fourth panel, to form the quadruple-layer panel after bonding.
4. The panel attach alignment method of claim 3, wherein, The aligning and bonding of the first panel and the second panel to form the double-layer panel, the aligning and bonding of the double-layer panel and the third panel to form the triple-layer panel, and the aligning and bonding of the triple-layer panel and the fourth panel to form the quadruple-layer panel are all performed by at least two cameras, and the at least two cameras are arranged above or below the double-layer panel, the triple-layer panel and the quadruple-layer panel simultaneously.
5. The panel attach alignment method of claim 4, wherein, The number of the at least two cameras is four, two of the four cameras are arranged above the double-layer panel, the triple-layer panel and the quadruple-layer panel, and the other two of the four cameras are arranged below the double-layer panel, the triple-layer panel and the quadruple-layer panel.
6. The panel attach alignment method of claim 2, wherein, The first panel, the second panel, the third panel and the fourth panel are cholesteric liquid crystal panels respectively.
7. The panel attach alignment method of claim 2, wherein, The first panel, the second panel, the third panel and the fourth panel are panels of different colors.
8. The panel attach alignment method of claim 2, wherein, The first panel, the second panel, the third panel and the fourth panel each comprise a display area, and the four pairs of alignment targets are located in areas outside the display areas respectively.
9. An alignment target, characterized in that Arranged on a panel, and comprising: a first area surrounded by a plurality of boundaries; and at least one second area located in the first area, wherein the at least one second area allows light to penetrate, and other areas of the first area excluding the at least one second area prohibit light from penetrating; The distance between the at least one second region and a border of the first region is less than or equal to 0.02 mm.
10. The alignment target of claim 9, wherein, The material of the first region is metal.
11. The alignment target of claim 9, wherein, The number of the at least one second region is five, and the plurality of second regions are respectively located at four corners and a center position of the alignment target.
12. The alignment target of claim 9, wherein, The shape of the first region is cross-shaped, and the shape of the at least one second region is circular.
13. The alignment target of claim 12, wherein, The diameter of the at least one second region is less than 0.18 mm.
14. The alignment target of claim 9, wherein, The length of the border is less than or equal to 0.18 mm.