Display module and display device

Abstract

The application provides a display module and a display device. The display panel of the display module comprises a first plane area, the first plane area comprises a display area and a non-display area surrounding the display area; a bending area is located at the end of the first plane area and a second plane area; the second plane area is bent to the back side of the display panel through the bending area; a back plate is located in the opposite space between the first plane area and the second plane area, comprising a first back plate and a second back plate which are arranged separately, and the first back plate is arranged on the first plane area. By arranging a first ink pattern on the side of the first back plate facing the bending area and away from the display panel, and locating the first ink pattern in the non-display area, on the one hand, the metal wiring on the back of the display panel can be prevented from affecting the device in grabbing the lower edge of the first back plate through the back plate; on the other hand, the black ink will form a clear contrast with the overflowed glue, thereby improving the accuracy of edge grabbing.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display module and display device. Background Technology

[0002] As flexible display technology matures, flexible display devices (such as foldable phones, foldable tablets, or foldable computers) will be a major trend in the future. To protect and support the display panel, segmented backplates are attached after the glass is laser-peeled off. A CCD (image sensor) is used to align the bottom edge of the first backplate with the alignment mark on the display panel, thereby detecting the attachment accuracy of the backplate.

[0003] However, because the substrate of the backplate is usually made of polyimide (PI) or polyethylene terephthalate (PET), which has high transmittance, the metal traces on the back of the display panel can be seen through the backplate under a microscope. In addition, the backplate substrate and adhesive are usually cut together and applied using rollers. After application, there is often noticeable adhesive overflow at the lower end of the first backplate. Both of these problems can cause mis-grabbing and out-of-range alarms when the equipment checks the backplate application accuracy, reducing the lamination efficiency of the production line.

[0004] In summary, to address the issues of false grabbing and out-of-specification alarms in the backplate attachment accuracy testing process of existing flexible display modules, this application provides a display module and display device to improve this problem from the source. Summary of the Invention

[0005] This application provides a display module and display device that can solve the problems of false grabbing and out-of-specification alarms in the process of detecting the back panel attachment accuracy of flexible display modules from the source.

[0006] This application provides a display module, including...

[0007] The display panel includes a first planar area, a bent area, and a second planar area. The first planar area includes a display area and a non-display area surrounding the display area. The bent area is located at the ends of the first planar area and the second planar area. The second planar area is bent to the back side of the display panel through the bent area.

[0008] The back panel, located in the opposing space between the first planar area and the second planar area, includes a first back panel and a second back panel that are disconnected from each other. The first back panel is disposed in the first planar area, and the second back panel is disposed in the second planar area.

[0009] The first back plate has a first ink pattern on the side facing the bending area and away from the display panel, and the first ink pattern is located in the non-display area.

[0010] According to one embodiment of this application, the display module includes a cover plate located on the light-emitting side of the display panel. A second ink pattern is disposed around the cover plate facing the display panel, and the second ink pattern is aligned with the non-display area of ​​the first planar area.

[0011] According to one embodiment of this application, the outer edge of the second ink pattern is flush with the edge of the cover plate, and the inner edge of the second ink is more than 0.25 mm away from the edge of the display area.

[0012] According to one embodiment of this application, the outer edge of the first ink pattern is flush with the edge of the first back plate, and the inner edge of the projection of the first ink pattern onto the second ink pattern is at least 0.2 mm away from the inner edge of the nearest second ink pattern.

[0013] According to one embodiment of this application, the display module includes a support layer located on the side of the first backplate away from the display panel.

[0014] According to one embodiment of this application, the support layer includes a support functional layer and auxiliary adhesive layers located on both sides of the support functional layer.

[0015] According to one embodiment of this application, the display module includes a reinforcing layer located on the side of the support layer away from the display panel.

[0016] According to one embodiment of this application, the display module includes an adhesive layer located between the reinforcing layer and the second backplate.

[0017] According to one embodiment of this application, the display module includes a polarizer located between the cover plate and the display panel.

[0018] A display device comprising the display module described in any of the above embodiments.

[0019] The beneficial effects of the embodiments of this application are as follows: This application provides a display module and a display device. The display panel of the display module includes a first planar area, which includes a display area and a non-display area surrounding the display area; a bending area located at the ends of the first and second planar areas; a second planar area bent to the back side of the display panel through the bending area; and a back plate located in the opposing space between the first and second planar areas, including a first back plate and a second back plate that are disconnected, with the first back plate disposed in the first planar area. By setting a first ink pattern on the side of the first back plate facing the bending area and away from the display panel, and placing the first ink pattern in the non-display area, on the one hand, it can prevent the metal traces on the back of the display panel from affecting the device's gripping of the lower edge of the first back plate through the back plate; on the other hand, the black ink will form a clear contrast with the overflowing adhesive, improving the gripping accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the display module provided in the embodiments of this application;

[0022] Figure 2 This is a planar schematic diagram of the back panel in the flattened state according to an embodiment of this application. Detailed Implementation

[0023] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. Directional terms used in this application, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side], etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative and understanding purposes and not for limiting the application. In the figures, structurally similar units are represented by the same reference numerals.

[0024] The present application will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1As shown, the display module includes a display panel 11 and a back panel 12. The display panel 11 includes a first planar area 31, a bending area 32, and a second planar area 33. The bending area 32 is located at the ends of the first planar area 31 and the second planar area 33. The second planar area 33 is bent to the back side of the display panel 11, i.e., the non-light-emitting side of the display panel 11, through the bending area 32, to reduce the bezel width of the display module and achieve a narrow bezel or bezel-less design. The first planar area 31 includes a display area AA and a non-display area surrounding the display area AA. The bending area 32 and the second planar area 33 are both non-display areas of the display panel 11.

[0026] It should be noted that the display area AA refers to the part of the display panel 11 used for displaying the image, while the non-display area AA is the part used for designing various traces, driving circuits, etc. The bending area 32 is designed with traces for connecting to the signal traces within the display area AA; the second planar area 33 is designed with a flexible printed circuit board and a bonding driver (not shown in the figure). The light-emitting side of the display panel 11 refers to the side of the display panel 11 where the image is displayed, and the non-light-emitting side of the display panel 11 refers to the side opposite to the light-emitting side of the display panel 11.

[0027] The back plate 12 is located in the opposing space between the first planar area 31 and the second planar area 33, and includes a first back plate 121 and a second back plate 122 that are disconnected. The first back plate 121 is disposed in the first planar area, and the second back plate 122 is disposed in the second planar area. The first back plate 121 and the second back plate 122 are flush with the ends of the bending area 32.

[0028] Furthermore, a first ink pattern 21 is provided on the side of the first back plate 121 facing the bending area 32 and away from the display panel 11, and the first ink pattern 21 is located in the non-display area. Figure 2 This is a plan view of the back panel in its flattened state, as shown below. Figure 2 The first back plate 121 and the second back plate 122 are disconnected in the area corresponding to the bending area 32. The first back plate 121 is provided with a first ink pattern 21 at one end facing the second back plate 122. In the direction perpendicular to the bending direction, the width of the first ink pattern 21 is equal to the width of the first back plate 121.

[0029] Typically, the adhesion accuracy of the backplate 12 on the display panel 11 is tested by using a CCD to capture the lower edge of the first backplate 121 and aligning it with the alignment mark on the display panel 11. However, since the substrate of the backplate 12 is generally PI or PET, which has high transmittance, the metal traces on the back of the display panel 11 can be seen through the backplate 12 under a microscope, making it impossible to accurately identify the lower edge of the first backplate 121. Furthermore, since the substrate and adhesive of the backplate 12 are usually cut together and applied using rollers, there is often significant adhesive overflow at the lower end of the first backplate 121 after application. All of these problems can cause mis-grabbing and out-of-range alarms when the equipment tests the adhesion accuracy of the backplate 12, reducing the bonding efficiency of the production line.

[0030] This application adds a black opaque ink design to the lower edge of the first back plate 121. On the one hand, it prevents the metal traces on the back of the display panel 11 from affecting the device's gripping of the lower edge of the first back plate 121 through the back plate 12. On the other hand, the black ink will form a clear contrast with the overflowing adhesive, improving the gripping accuracy.

[0031] In a preferred embodiment, the thickness of the first ink pattern 21 is 6 μm.

[0032] It should be noted that the alignment mark on the display panel 11 should avoid the first ink pattern 21, so as to prevent the first ink pattern 21 from obscuring the alignment mark. Optionally, the alignment mark is located below the second back plate 122.

[0033] Furthermore, the display module includes a cover plate 13 located on the light-emitting side of the display panel 11. A second ink pattern 22 is disposed around the perimeter of the cover plate 13 facing the display panel 11. The second ink pattern 22 avoids the display area AA and is aligned with the non-display area of ​​the first planar area 31. The second ink pattern 22 can cover the edge structure of the film layer, improving the appearance. Optionally, the substrate of the cover plate 13 is hardened PET, i.e., a hard coating is applied to the surface of the PET substrate. This application does not specifically limit the material of the cover plate 13.

[0034] It should be noted that the outer edge of the second ink pattern 22 is flush with the edge of the cover plate 13. The distance between the inner edge of the second ink pattern 22 and the edge of the display area AA is defined as b. There exists a relationship b ≥ 0.25 mm, meaning the inner edge of the second ink pattern 22 is at least 0.25 mm away from the edge of the display area AA, thus ensuring that the second ink pattern 22 does not affect the display area AA.

[0035] Furthermore, the outer edge of the first ink pattern 21 is flush with the edge of the first back plate 121. The distance between the inner edge of the projection of the first ink pattern 21 onto the second ink pattern 22 and the inner edge of the nearest second ink pattern 22 is defined as a. There exists a relationship a≥0.2mm, that is, the inner edge of the projection of the first ink pattern 21 onto the second ink pattern 22 is more than 0.2mm away from the inner edge of the nearest second ink pattern 22, thereby ensuring that the first ink pattern 21 will not enter the display area of ​​the module.

[0036] Continue to refer to Figure 1 The display panel 11 further includes a support layer 14, which is located on the side of the first backplate 121 away from the display panel 11. It should be noted that the support layer 14 includes a support functional layer and auxiliary adhesive layers (not shown in the figure) on both sides of the support functional layer. Optionally, the support functional layer includes foam with a thickness of 100 μm, and the auxiliary adhesive layers can be adhesive materials with a thickness of 25 μm. It should be noted that the support layer 14 can absorb the step difference caused by the thickness of the first ink pattern 21, thereby preventing the formation of air bubbles. Furthermore, the foam has good heat insulation properties, which can prevent the heat generated by the display module during operation from affecting the display area AA.

[0037] Furthermore, the display module also includes a reinforcing layer 15 located on the side of the support layer 14 away from the display panel 11. The reinforcing layer 15 includes, but is not limited to, one of SUS (stainless steel) or an alloy.

[0038] Furthermore, an adhesive layer 16 is provided between the reinforcing layer 15 and the second back plate 122. The adhesive layer 16 includes double-sided adhesive tapes such as composite tapes, and the composite tape can be a double-sided adhesive fixing support tape (Stiffener).

[0039] Furthermore, the display module includes a polarizer 17 located between the cover plate 13 and the display panel 11. In one embodiment, the polarizer 17 is bonded to the cover plate 13 with an optical adhesive, which includes, but is not limited to, OCA (Optically Clear Adhesive). The optical adhesive is a flexible material that can accommodate the second ink pattern 22, preventing step differences caused by the thickness of the second ink pattern, thereby preventing the formation of bubbles. The polarizer 17 is positioned facing the light-emitting surface of the display panel 11. When ambient light is incident on the display module, the polarizer 17 can absorb some of the ambient light, preventing it from being reflected by the metal traces inside the display panel 11, thereby reducing reflectivity and improving the contrast of the display module.

[0040] This invention also provides a display device, which includes the display module described in any of the foregoing embodiments.

[0041] The beneficial effects of the embodiments of this application are as follows: This application provides a display module and a display device. The display panel of the display module includes a first planar area, which includes a display area and a non-display area surrounding the display area; a bending area located at the ends of the first and second planar areas; a second planar area bent to the back side of the display panel through the bending area; and a back plate located in the opposing space between the first and second planar areas, including a first back plate and a second back plate that are disconnected, with the first back plate disposed in the first planar area. By setting a first ink pattern on the side of the first back plate facing the bending area and away from the display panel, and placing the first ink pattern in the non-display area, on the one hand, it can prevent the metal traces on the back of the display panel from affecting the device's gripping of the lower edge of the first back plate through the back plate; on the other hand, the black ink will form a clear contrast with the overflowing adhesive, improving the gripping accuracy.

[0042] In summary, although the present application discloses the preferred embodiments as described above, the above preferred embodiments are not intended to limit the present application. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application is based on the scope defined by the claims.

Claims

1. A display module, characterized in that, include: The display panel includes a first planar area, a bent area, and a second planar area. The first planar area includes a display area and a non-display area surrounding the display area. The bent area is located at the ends of the first planar area and the second planar area. The second planar area is bent to the back side of the display panel through the bent area. The back panel, located in the opposing space between the first planar area and the second planar area, includes a first back panel and a second back panel that are disconnected from each other. The first back panel is disposed in the first planar area, and the second back panel is disposed in the second planar area. The first back plate has a first ink pattern on the side facing the bending area and away from the display panel, and the first ink pattern is located in the non-display area. The display module further includes a cover plate located on the light-emitting side of the display panel. A second ink pattern is disposed around the cover plate facing the display panel. The second ink pattern is aligned with the non-display area of ​​the first planar area. The outer edge of the first ink pattern is flush with the edge of the first back plate. The projection of the first ink pattern onto the second ink pattern falls within the second ink pattern. The inner edge of the projection of the first ink pattern onto the second ink pattern is at least 0.2 mm away from the inner edge of the nearest second ink pattern.

2. The display module as described in claim 1, characterized in that, The outer edge of the second ink pattern is flush with the edge of the cover plate, and the inner edge of the second ink pattern is more than 0.25 mm away from the edge of the display area.

3. The display module as described in claim 1, characterized in that, The display module includes a support layer located on the side of the first backplate away from the display panel.

4. The display module as described in claim 3, characterized in that, The support layer includes a support functional layer and auxiliary adhesive layers located on both sides of the support functional layer.

5. The display module as described in claim 3, characterized in that, The display module includes a reinforcing layer located on the side of the support layer away from the display panel.

6. The display module as described in claim 5, characterized in that, The display module includes an adhesive layer located between the reinforcing layer and the second backplate.

7. The display module as described in claim 1, characterized in that, The display module includes a polarizer located between the cover plate and the display panel.

8. A display device, characterized in that, Includes the display module as described in any one of claims 1 to 7.

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