Display devices

Abstract

A display device is provided. The display device includes: a display panel having a display portion (DP), a connecting portion (CP), and a bending portion (PBP); a polarizer (PL) located on a first side of the display portion; a cover window (CF) located on a first side (S1) of the display portion (DP) and on a side of the polarizer (PL) away from the display portion (DP); a coating (MCL) having a main portion (Pm) and an inclined portion (Pt) extending from the main portion (Pm) toward the polarizer (PL); and an optically transparent adhesive layer (OCA) located on the first side (S1) of the display portion (DP) and between the polarizer (PL) and the cover window (CF). The optically transparent adhesive layer (OCA) has a first adhesive surface (Sa1) at least partially attached to the cover window (CF), a second adhesive surface (Sa2) at least partially attached to the polarizer (PL), and an edge (Eoca) connecting the first adhesive surface (Sa1) and the second adhesive surface (Sa2) and adjacent to the inclined portion (Pt).

Description

Technical Field

[0001] The present invention relates to display technology, and in particular to a display device. Background Art

[0002] A flexible display device is a bendable or deformable display device having a flexible display panel. Examples of flexible display devices include flexible organic light-emitting diode (OLED) display devices, flexible electrophoretic display (EPD) devices, and flexible liquid crystal display (LCD) devices. As a new generation of display devices, flexible display devices are thinner and lighter, with high contrast, high responsiveness, and high brightness. They also provide full color and a wide viewing angle. Flexible display devices are widely used in mobile phones, personal digital assistants (PDAs), digital cameras, car displays, laptops, wall-mounted TVs, and various military applications. A flexible display device includes a flexible array substrate. The base substrate of the flexible array substrate can be made of a flexible material such as plastic. Summary of the Invention

[0003] In one aspect, the present disclosure provides a display device comprising: a display panel comprising a display portion, a connecting portion and a curved portion; a polarizer located on a first side of the display portion; a cover window located on the first side of the display portion and on a side of the polarizer away from the display portion; a coating comprising a main portion and an inclined portion extending from the main portion toward the polarizer, wherein the curved portion connects the display portion and the connecting portion, the curved portion is bent so that the connecting portion faces a second side of the display portion to form a curved cavity surrounded by the curved portion, the second side being opposite to the first side, the coating covering a back side of the curved portion opposite to a side directly surrounding the curved cavity; and an optically transparent adhesive layer located on the first side of the display portion and between the polarizer and the cover window, the optically transparent adhesive layer attaching the cover window to the polarizer, wherein the optically transparent adhesive layer has at least a first adhesive surface that is partially attached to the cover window, a second adhesive surface that is at least partially attached to the polarizer, and an edge connecting the first adhesive surface and the second adhesive surface and adjacent to the inclined portion; wherein the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion is between the orthographic projection of the edge of the cover window on the plane including the main surface of the display portion and the orthographic projection of the edge of the polarizer on the plane including the main surface of the display portion; and the orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on the plane including the main surface of the display portion is aligned with the orthographic projection of the edge of the polarizer adjacent to the inclined portion on the plane including the main surface of the display portion, or is between the orthographic projection of the edge of the polarizer adjacent to the inclined portion on the plane including the main surface of the display portion and the orthographic projection of the edge of the cover window adjacent to the inclined portion on the plane including the main surface of the display portion.

[0004] Optionally, the height of the inclined portion relative to the main surface of the display portion on the first side gradually increases from the edge of the inclined portion adjacent to the polarizer to the boundary between the inclined portion and the main portion; the first shortest distance between the orthographic projection of the edge of the polarizer adjacent to the inclined portion on the plane including the main surface of the display portion and the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion is equal to or greater than a first value.

[0005] Optionally, a fourth shortest distance between an orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on a plane including the main surface of the display portion and an orthographic projection of the edge of the cover window adjacent to the inclined portion on a plane including the main surface of the display portion is equal to or greater than a second value.

[0006] Optionally, the height of the inclined portion relative to the main surface of the display portion on the first side gradually increases from the edge of the inclined portion adjacent to the polarizer to the boundary between the inclined portion and the main portion; and the orthographic projection of the edge of the cover window on the plane including the main surface of the display portion is between the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on the plane including the main surface of the display portion.

[0007] Optionally, the second shortest distance between the orthographic projection of the edge of the covering window adjacent to the inclined portion on the plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on the plane including the main surface of the display portion is also equal to or greater than the first value.

[0008] Optionally, the orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on the plane including the main surface of the display part is aligned with the orthographic projection of the edge of the polarizer adjacent to the inclined portion on the plane including the main surface of the display part.

[0009] Optionally, a third shortest distance between an orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on a plane including the main surface of the display part and an orthographic projection of the virtual contour line on a plane including the main surface of the display part is also equal to or greater than the first value; the virtual contour line is on the surface of the inclined part; and a height of the virtual contour line relative to the main surface of the display part on the first side is equal to a height of the second adhesive surface relative to the main surface of the display part on the first side.

[0010] Optionally, the second value is equal to a bonding tolerance of the optically clear adhesive layer.

[0011] Optionally, the second value is in the range of 100 μm to 200 μm.

[0012] Optionally, the first value is equal to an engineering tolerance of the inclined portion.

[0013] Optionally, the first value is in the range of 150 μm to 250 μm.

[0014] Optionally, the display device further comprises a frame covering the coating layer and located on a side of the coating layer away from the bent portion, wherein the frame is connected to the cover window.

[0015] Optionally, the display device also includes a first back film, which covers the back surface of the display part on the second side; wherein the display part has a display area for displaying an image and a fan-out area between the display area and the curved part, and the display part includes a plurality of signal lines extending through the fan-out area; and the orthographic projection of the edge of the first back film adjacent to the curved part on the plane including the main surface of the display part is between the orthographic projection of the boundary between the fan-out area and the curved part on the plane including the main surface of the display part and the orthographic projection of the bending line along which the curved part is bent on the plane including the main surface of the display part.

[0016] Optionally, a fifth shortest distance between an orthographic projection of an edge of the first back film adjacent to the bent portion on a plane including the main surface of the display portion and an orthographic projection of the bent line on a plane including the main surface of the display portion is equal to or greater than a third value, the third value being equal to a is a bonding tolerance of the first backing film; and b is a bending tolerance of the bent portion.

[0017] Optionally, the third value is in the range of 100 μm to 200 μm.

[0018] Optionally, a sixth shortest distance between an orthographic projection of an edge of the first back film adjacent to the bent portion on a plane including the main surface of the display portion and an orthographic projection of a boundary between the fan-out area and the bent portion on a plane including the main surface of the display portion is equal to or greater than a fourth value, wherein the fourth value is a composite tolerance calculated based on the bonding tolerance of the first back film and the material tolerance of the first back film.

[0019] Optionally, the fourth value is in the range of 100 μm to 200 μm.

[0020] Optionally, the seventh shortest distance between the orthographic projection of the edge of the first back film adjacent to the bent portion on the plane including the main surface of the display portion and the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion is equal to or greater than a fifth value, which is the sum of the flow tolerance of the coating, the bonding tolerance of the first back film and the excess length of the neutral plane of the structure including the bent portion and the coating.

[0021] Optionally, the fifth value is in the range of 300 μm to 500 μm.

[0022] Optionally, a distance between an orthographic projection of an edge of the inclined portion adjacent to the polarizer on a plane including the main surface of the display portion and an orthographic projection of a boundary between the inclined portion and the main portion on a plane including the main surface of the display portion is less than 400 μm.

[0023] Optionally, the coating covering the back side of the bent portion extends a first spacing on the first side of the display portion and extends a second spacing on a side of the connecting portion opposite to the display portion; and the first spacing and the second spacing are respectively in the range of 150μm to 250μm.

[0024] Optionally, the connecting portion and the display portion are part of a stacked structure in the display device; wherein, on the first side of the display portion, the stacked structure includes one or more of the following: a polarizer on the display portion; an optically transparent adhesive layer, the optically transparent adhesive layer being located on a side of the polarizer away from the display portion; and a covering window, the covering window being located on a side of the optically transparent adhesive layer away from the polarizer, wherein the optically transparent adhesive layer attaches the covering window to the polarizer; wherein, on the second side of the display portion, the stacked structure includes one or more of the following: a first backing film, which is on the back surface of the display portion on the second side; a supporting layer, which is located on a side of the first backing film away from the display portion; a metal plate, which is located on a side of the supporting layer away from the first backing film; a second backing film, which is located on a side of the metal plate away from the supporting layer; and the connecting portion is located on a side of the second backing film away from the metal plate.

[0025] Optionally, the orthographic projection of an edge of the supporting layer on the display portion substantially overlaps with the orthographic projection of an edge of the first back film on the display portion; and the orthographic projection of the supporting layer on the display portion covers the orthographic projection of the metal plate on the display portion by up to a spacing.

[0026] Optionally, the display device also includes: a second optically transparent adhesive layer, which is between the first back film and the support layer, and the second optically transparent adhesive layer adheres the first back film and the support layer together; and an adhesive layer between the metal plate and the second back film, and the adhesive layer adheres the metal plate and the second back film together.

[0027] Optionally, the display device also includes: an adhesive layer between the metal plate and the second back film, the adhesive layer adhering the metal plate and the second back film together; ultra-thin glass, which is located on the side of the cover window away from the display part; a second optically transparent adhesive layer, the second optically transparent adhesive layer is between the ultra-thin glass and the cover window, the second optically transparent adhesive layer adheres the ultra-thin glass and the cover window together; a second cover window, which is located on the side of the ultra-thin glass away from the cover window; and a third optically transparent adhesive layer, the third optically transparent adhesive layer is between the ultra-thin glass and the second cover window, the third optically transparent adhesive layer adheres the ultra-thin glass and the second cover window together. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings are examples for illustration purposes only, in accordance with various disclosed embodiments, and are not intended to limit the scope of the invention.

[0029] Figure 1 is a schematic diagram of a display device in some embodiments according to the present disclosure.

[0030] Figure 2 is a schematic diagram of a display device in some embodiments according to the present disclosure.

[0031] Figure 3 is a plan view of a display device in some embodiments according to the present disclosure.

[0032] Figure 4A is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0033] Figure 4B is a partial view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure.

[0034] Figure 4C is a partial plan view around an inclined portion of a coating layer in a display device in some embodiments according to the present disclosure.

[0035] Figure 4D is a plan view of a support layer, a first backing film, and a metal plate in some embodiments according to the present disclosure.

[0036] Figure 4E is a partial view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure.

[0037] Figure 5 is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0038] Figure 6 is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0039] Figure 7 is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0040] Figure 8A is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0041] Figure 8B is a partial view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure.

[0042] Figure 8C is a partial plan view around an inclined portion of a coating layer in a display device in some embodiments according to the present disclosure.

[0043] Figure 9A In some embodiments according to the present disclosure, Figure 3 Magnified view of the area outlined by the dashed circle.

[0044] Figure 9B In some embodiments according to the present disclosure, Figure 3 Magnified view of the area outlined by the dashed circle.

[0045] Figure 10 is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0046] Figure 11 is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0047] Figure 12 A partial stacked structure including a support layer in some embodiments according to the present disclosure is shown.

[0048] Figure 13A is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure.

[0049] Figure 13B is a plan view of a support layer, a first backing film, and a metal plate in some embodiments according to the present disclosure.

[0050] 14A to 14E A method of manufacturing a display device in some embodiments is shown. DETAILED DESCRIPTION

[0051] The present disclosure will now be described in more detail with reference to the following examples. It should be noted that the following description of some embodiments presented herein is for illustration and description purposes only. It is not intended to be exhaustive or limited to the precise forms disclosed.

[0052] The present disclosure provides, inter alia, a display device that substantially avoids one or more problems caused by limitations and shortcomings of the prior art. In one aspect, the present disclosure provides a display device. In some embodiments, the display device includes a display panel, the display panel including a display portion, a connecting portion and a curved portion, the curved portion connecting the display portion and the connecting portion, wherein the curved portion is bent so that the connecting portion faces the second side of the display portion to form a curved cavity surrounded by the curved portion, the second side being opposite to the first side; a polarizer on the first side of the display portion; a cover window, the cover window being located on the first side of the display portion and on the side of the polarizer away from the display portion; a coating covering the back side of the curved portion opposite to the side directly surrounding the curved cavity; and an optically transparent adhesive layer, the optically transparent adhesive layer being on the first side of the display portion and between the polarizer and the cover window, the optically transparent adhesive layer attaching the cover window to the polarizer, wherein the optically transparent adhesive layer has a first adhesive surface at least partially attached to the cover window, a second adhesive surface at least partially attached to the polarizer, and an edge connecting the first adhesive surface and the second adhesive surface and adjacent to the inclined portion. Optionally, the coating has a main portion and an inclined portion extending from the main portion toward the polarizer. Optionally, the height of the inclined portion relative to the main surface of the display portion on the first side gradually increases from the edge of the inclined portion adjacent to the polarizer to the boundary between the inclined portion and the main portion. Optionally, the orthographic projection of the edge of the cover window on the plane including the main surface of the display portion is between the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on the plane including the main surface of the display portion. Optionally, the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion is between the orthographic projection of the edge of the cover window on the plane including the main surface of the display portion and the orthographic projection of the edge of the polarizer on the plane including the main surface of the display portion. Optionally, the orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on the plane including the main surface of the display portion is aligned with the orthographic projection of the edge of the adjacent inclined portion of the polarizer on the plane including the main surface of the display portion, or is between the orthographic projection of the edge of the adjacent inclined portion of the polarizer on the plane including the main surface of the display portion and the orthographic projection of the edge of the adjacent inclined portion of the cover window on the plane including the main surface of the display portion.

[0053] Optionally, a first shortest distance between an orthographic projection of an edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion and an orthographic projection of an edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion is equal to or greater than a first value. Optionally, a second shortest distance between an orthographic projection of an edge of the cover window adjacent to the inclined portion on a plane including the main surface of the display portion and an orthographic projection of a boundary between the inclined portion and the main portion on a plane including the main surface of the display portion is also equal to or greater than the first value.

[0054] Figure 1 is a schematic diagram of a display device according to some embodiments of the present disclosure. Figure 1 The display device includes a display panel having a display portion in a display region DR, in which an image is displayed by a sub-pixel array in the display portion. The peripheral area of ​​the display device surrounds the display region DR. Although Figure 1 A rectangular display area is shown in FIG, but the display area DR can have any appropriate shape and size. Examples of appropriate shapes of the display area DR include circles, squares, hexagons, ellipses, and irregular polygons. Each sub-pixel in the display area DR can be electrically connected to a pixel drive circuit comprising one or more thin film transistors. The display device also includes gate lines and data lines for providing signals that drive the image display in the display area DR. These signal lines are electrically connected to one or more integrated circuits, such as a gate drive integrated circuit and a data drive integrated circuit. One or more integrated circuits can be integrated into the display panel (chip on glass) or mounted on a flexible printed circuit (chip on film). One or more integrated circuits are electrically connected to the flexible printed circuit. The display device also includes various other signal lines, such as a high voltage power line VDD, a low voltage power line VSS, and a start signal line.

[0055] The display device further includes a bending portion PBP and a connecting portion CP. The connecting portion CP is a portion where the flexible printed circuit can be joined to the display device. The bending portion PBP is flexible or bendable. Figure 1 As shown, the curved portion PBP can be along Figure 1 The connection portion CP is bent in the direction of the arrow shown in FIG. 8 , so that the connection portion CP can be bent toward the back side of the display portion DP. Figure 2 is a schematic diagram of a display device in some embodiments according to the present disclosure. Figure 2 The display device is shown in which the bending portion PBP is bent and the connection portion CP is bent toward the back side of the display portion DP.

[0056] Figure 3 is a plan view of a display device in some embodiments according to the present disclosure. Figure 3In some embodiments, the display portion DP is in the display region DR displaying an image and in the fan-out region FR between the display region DR and the bent portion PBP, and the display portion DP includes a plurality of signal lines SL extending through the fan-out region FR.

[0057] As used herein, the term "display area" refers to the area of ​​the display panel in the display device that actually displays the image. Optionally, the display area may include a sub-pixel area and an inter-sub-pixel area. The sub-pixel area refers to the light-emitting area of ​​the sub-pixel, for example, the area corresponding to the pixel electrode in the liquid crystal display or the area corresponding to the light-emitting layer in the organic light-emitting diode display panel. The inter-sub-pixel area refers to the area between adjacent sub-pixel areas, for example, the area corresponding to the black matrix in the liquid crystal display or the area corresponding to the pixel defining layer in the organic light-emitting diode display panel. Optionally, the inter-sub-pixel area is the area between adjacent sub-pixel areas in the same pixel. Optionally, the inter-sub-pixel area is the area between two adjacent sub-pixel areas in two adjacent pixels. Optionally, the display device is a flexible display device.

[0058] Figure 4A is a cross-sectional view around a curved portion of a display device according to some embodiments of the present disclosure. Figure 4A In some embodiments, the display device includes a display portion DP; a polarizer PL on a first side S1 of the display portion DP; a cover window CF on the first side S1 of the display portion DP and located on a side of the polarizer PL away from the display portion DP; a connection portion CP; and a curved portion PBP connecting the display portion DP and the connection portion CP. The curved portion PBP is curved so that the connection portion CP faces the second side S2 of the display portion DP, forming a curved cavity CPb surrounded by the curved portion PBP. Figure 4A As shown, the second side S2 is opposite to the first side S1.

[0059] In some embodiments, the display device further includes a coating layer MCL that covers a backside SDB of the curved portion PBP, opposite the side SDPS directly surrounding the curved cavity Cpb. In one example, the backside SDB of the curved portion PBP is the side of the curved portion PBP that is in direct contact with the coating layer MCL, and the side SDPS directly surrounding the curved cavity Cpb is the side of the curved portion PBP that is not in contact with the coating layer MCL. The coating layer MCL includes a main portion Pm and an inclined portion Pt extending from the main portion Pm toward the polarizer PL. For example, the inclined portion Pt extends from the main portion Pm to the first side S1 of the display portion DP, with the edge of the inclined portion Pt adjacent to the polarizer PL spaced apart from the polarizer PL. In one example, the inclined portion Pt covers a portion of the fan-out region FR in the display portion DP.

[0060] In some embodiments, the coating layer MCL further includes an additional inclined portion Pat extending from the main portion Pm to a side of the connection portion CP opposite to the display portion DP.

[0061] Figure 4B is a partial view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure. Figure 4C is a partial plan view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure. Figure 4B and Figure 4C In some embodiments, the height h of the inclined portion Pt relative to the main surface Sm of the display portion DP on the first side S1 gradually increases from the edge Ept of the inclined portion Pt adjacent to the polarizer PL to the boundary B1 between the inclined portion Pt and the main portion Pm. Optionally, boundary B1 is the boundary where the inclined portion Pt has a maximum height relative to the main surface Sm of the display portion DP on the first side S1. Optionally, boundary B1 is the boundary coplanar with the edge of the first back film BF1 facing the bending cavity Cpb.

[0062] Reference Figures 4A to 4C In some embodiments, the orthographic projection of the cover window CF on the plane including the main surface Sm of the display portion DP is between the orthographic projection of the edge Ept of the inclined portion Pt adjacent to the polarizer PL on the plane including the main surface Sm of the display portion DP and the orthographic projection of the boundary B1 between the inclined portion Pt and the main portion Pm on the plane including the main surface Sm of the display portion DP. Optionally, a first shortest distance Ds1 between the orthographic projection of the edge Epl of the polarizer PL adjacent to the inclined portion Pt on the plane including the main surface Sm of the display portion DP and the orthographic projection of the edge Ept of the polarizer PL adjacent to the inclined portion Pt on the plane including the main surface Sm of the display portion DP is equal to or greater than a first value. Optionally, a second shortest distance Ds2 between the orthographic projection of the edge Ecf of the cover window adjacent to the inclined portion Pt on the plane including the main surface Sm of the display portion DP and the orthographic projection of the boundary B1 between the inclined portion Pt and the main portion Pm on the plane including the main surface Sm of the display portion DP is also equal to or greater than the first value.

[0063] Optionally, the first value is equal to the engineering tolerance of the inclined portion Pt. Optionally, the engineering tolerance of the inclined portion Pt is in a range of 150 μm to 250 μm, for example, 150 μm to 175 μm, 175 μm to 200 μm, 200 μm to 225 μm, or 225 μm to 250 μm. Optionally, the first value is in a range of 150 μm to 250 μm, for example, 150 μm to 175 μm, 175 μm to 200 μm, 200 μm to 225 μm, or 225 μm to 250 μm. Optionally, the engineering tolerance of the inclined portion Pt is 200 μm. Optionally, the first value is 200 μm. Optionally, the first shortest distance Ds1 is equal to or greater than 200 μm. Optionally, the second shortest distance Ds2 is equal to or greater than 200 μm. As used herein, the term "engineering tolerance" refers to a tolerance of an error or an error range in forming a portion of a display device (eg, the tilted portion Pt).

[0064] In some embodiments, the display device further includes an optically transparent adhesive layer OCA on the first side S1 of the display portion DP. The optically transparent adhesive layer OCA is between the polarizer PL and the cover window CF. The optically transparent adhesive layer OCA attaches the cover window SF to the polarizer PL. Figure 4B In some embodiments, the optically transparent adhesive layer has a first adhesive surface Sa1 at least partially attached to the cover window SF, a second adhesive surface Sa2 at least partially attached to the polarizer PL, and an edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2. The edge Eoca is adjacent to the inclined portion Pt. Figures 4A to 4C , the orthographic projection of the edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on the plane including the main surface Sm of the display part DP is between the orthographic projection of the edge Epl of the adjacent inclined portion Pt of the polarizer PL on the plane including the main surface Sm of the display part DP and the orthographic projection of the edge Ecf of the adjacent inclined portion Pt of the cover window CF on the plane including the main surface Sm of the display part DP.

[0065] Optionally, the orthographic projection of the edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on the plane including the main surface Sm of the display part DP is between the orthographic projection of the edge Ept of the adjacent polarizer PL of the inclined part Pt on the plane including the main surface Sm of the display part DP and the orthographic projection of the boundary B1 between the inclined part Pt and the main part Pm on the plane including the main surface Sm of the display part DP.

[0066] In some embodiments, a third shortest distance Ds3 between an orthographic projection of an edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on a plane including the main surface Sm of the display portion DP and an orthographic projection of a virtual contour line Lvc on the surface of the inclined portion Pt on the plane including the main surface Sm of the display portion DP is also equal to or greater than the first value. Figure 4B In some embodiments, the virtual contour line Lvc is defined as follows: a height h1 of the virtual contour line Lvc relative to the main surface Sm of the display part DP on the first side S1 is equal to a height h2 of the second adhesive surface Sa2 relative to the main surface Sm of the display part DP on the first side S1.

[0067] Optionally, the first value is equal to the engineering tolerance Pt of the inclined portion. Optionally, the engineering tolerance of the inclined portion Pt is in a range of 150 μm to 250 μm, for example, 150 μm to 175 μm, 175 μm to 200 μm, 200 μm to 225 μm, or 225 μm to 250 μm. Optionally, the first value is in a range of 150 μm to 250 μm, for example, 150 μm to 175 μm, 175 μm to 200 μm, 200 μm to 225 μm, or 225 μm to 250 μm. Optionally, the engineering tolerance of the inclined portion Pt is 200 μm. Optionally, the first value is 200 μm. Optionally, the third shortest distance Ds3 is equal to or greater than 200 μm.

[0068] In some embodiments, a fourth shortest distance Ds4 between an orthographic projection of an edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on a plane including the main surface Sm of the display portion DP and an orthographic projection of an edge Ecf of the adjacent inclined portion Pt of the cover window CF on a plane including the main surface Sm of the display portion DP is equal to or greater than the second value.

[0069] Optionally, the second value is equal to the bonding tolerance of the optically transparent adhesive layer OCA. Optionally, the bonding tolerance of the optically transparent adhesive layer is in the range of 100 μm to 200 μm, for example, 100 μm to 125 μm, 125 μm to 150 μm, 150 μm to 175 μm, or 175 μm to 200 μm. Optionally, the second value is in the range of 100 μm to 200 μm, for example, 100 μm to 125 μm, 125 μm to 150 μm, 150 μm to 175 μm, or 175 μm to 200 μm. Optionally, the bonding tolerance of the optically transparent adhesive layer OCA is 150 μm. Optionally, the second value is 150 μm. Optionally, the fourth shortest distance Ds4 is equal to or greater than 150 μm. As used herein, the term "bonding tolerance" refers to the tolerance of an error or range of errors when bonding two components of a display device, for example, bonding an optically clear adhesive layer (OCA) to, for example, a cover window CF or a polarizer PL. This error may be caused by alignment errors when bonding the optically clear adhesive layer (OCA) to another component.

[0070] In some embodiments, reference Figures 4A to 4C , an orthographic projection of an edge Ept of the inclined portion Pt adjacent to the polarizer PL on the plane including the main surface Sm of the display portion DP is between an orthographic projection of an edge Epl of the polarizer PL adjacent to the inclined portion Pt on the plane including the main surface Sm of the display portion DP and an orthographic projection of an edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on the plane including the main surface Sm of the display portion DP. The orthographic projection of the edge Ept of the inclined portion Pt adjacent to the polarizer PL on the plane including the main surface Sm of the display portion DP is spaced apart from the orthographic projection of the edge Epl of the polarizer PL adjacent to the inclined portion Pt on the plane including the main surface Sm of the display portion DP by a first spacing distance d1 greater than zero, and is spaced apart from the orthographic projection of the edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on the plane including the main surface Sm of the display portion DP by a second spacing distance d2 greater than zero. An orthographic projection of an edge Epl of the polarizer PL adjacent to the inclined portion Pt on a plane including the main surface Sm of the display portion DP and an orthographic projection of an edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on a plane including the main surface Sm of the display portion DP are separated from each other by the sum of a first spacing distance d1 and a second spacing distance d2.

[0071] Furthermore, the position of the edge Epl of the polarizer PL adjacent to the inclined portion Pt may be carefully determined to prevent light leakage on the peripheral area of ​​the display device.

[0072] In some embodiments, the connection portion CP and the display portion DP are part of a stacked structure in a display device. Figure 4A , the display portion DP can be used as a reference for describing the structure of the stacked structure. On the first side S1 of the display portion DP (the side displaying the luminous image), in some embodiments, the stacked structure includes one or more of the following: a polarizer PL on the display portion DP; an optically transparent adhesive layer OCA located on a side of the polarizer PL away from the display portion DP; and a cover window CF located on a side of the optically transparent adhesive layer OCA away from the polarizer PL. The optically transparent adhesive layer OCA attaches the cover window CF to the polarizer. On the second side S2 (back side) of the display portion DP, in some embodiments, the stacked structure includes one or more of the following: a first back film BF1 on the back surface Sb of the second side S2 of the display portion DP, a supporting layer SL (e.g., a metal supporting layer) located on a side of the second back film BF1 away from the display portion DP; a metal plate MP located on a side of the supporting layer SL away from the second back film BF2; a second back film BF2 located on a side of the metal plate MP away from the supporting layer SL; and a connecting portion CP located on a side of the second back film BF2 away from the metal plate MP.

[0073] Figure 4D is a plan view of a support layer, a first backing film, and a metal plate in some embodiments according to the present disclosure. Figures 4A to 4D In some embodiments, the orthographic projection of the supporting layer SL on the display portion DP substantially overlaps with the orthographic projection of the first back film BF1 on the display portion DP. Optionally, the orthographic projection of the edge Esl of the supporting layer SL on the display portion DP substantially overlaps with the orthographic projection of the edge Ebf1 of the first back film BF1 on the display portion DP. Optionally, the orthographic projection of the first back film BF1 on the display portion DP covers the orthographic projection of the metal plate MP on the display portion DP by up to a spacing. Optionally, the orthographic projection of the supporting layer SL on the display portion DP covers the orthographic projection of the metal plate MP on the display portion DP by up to a spacing.

[0074] Figure 4E is a partial view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure. Figure 4EIn some embodiments, the edge Eoca connecting the first adhesion surface Sa1 and the second adhesion surface Sa2 is not a vertical edge (e.g., not perpendicular to the first adhesion surface Sa1 or the second adhesion surface Sa2), but rather an edge having an acute inclination angle relative to the first adhesion surface Sa1. Therefore, the edge Eoca includes a first edge Eo1 at the junction with the first adhesion surface Sa1 and a second edge Eo2 at the junction with the second adhesion surface Sa2. Optionally, the "orthographic projection of the edge Eoca connecting the first adhesion surface Sa1 and the second adhesion surface Sa2" refers to the orthographic projection of the second edge Eo2.

[0075] Figure 5 is a cross-sectional view around a curved portion of a display device according to some embodiments of the present disclosure. Figure 5 In some embodiments, the display device further includes a bezel BZ covering the coating MCL. The bezel BZ is located on a side of the coating MCL away from the curved portion PBP. Optionally, the bezel BZ is connected to the cover window CF. Optionally, the bezel BZ is made of a relatively rigid material.

[0076] Figure 6 is a cross-sectional view around a curved portion of a display device according to some embodiments of the present disclosure. Figure 6 In some embodiments, a display device includes a display portion DP; a connection portion CP; a curved portion PBP connecting the display portion DP and the connection portion CP; a first backing film BF1 covering the surface of the display portion DP facing the connection portion CP; a second backing film BF2 covering the surface of the connection portion CP facing the display portion DP; and a supporting layer SL and a metal plate MP between the first backing film BF1 and the second backing film BF2. The supporting layer SL is between the metal plate MP and the first backing film BF1. The metal plate MP is between the supporting layer SL and the second backing film BF2. As discussed above, in some embodiments, the display device includes a curved cavity CPb surrounded by the curved portion PBP. The curved portion PBP is devoid of any backing films; for example, the first and second backing films BF1 and BF2 are absent in the area containing the curved portion PBP. In one example, the cover window CF has a thickness of 83±5 μm, the optically clear adhesive layer OCA has a thickness of 50±5 μm, the polarizer PL has a thickness of 55±5 μm, and the coating MCL has a thickness of 90±30 μm. In principle, the sum of the thickness of the optically transparent adhesive layer OCA and the thickness of the polarizer PL is equal to or greater than the thickness of the coating layer MCL. The inventors of the present disclosure have found that when the thickness of the coating layer MCL reaches a maximum value (e.g., 120 μm), the thickness of the coating layer MCL becomes greater than the sum of the thickness of the optically transparent adhesive layer OCA and the thickness of the polarizer PL. Figure 6As shown, a first interference region Ri1 is formed in which the cover window CF and the coating layer MCL interfere with each other, resulting in an excessive force on the protruding or bent portion PBP in the cover window CF.

[0077] Therefore, the inventors of the present invention have developed a complex structure to eliminate the following problems by defining key parameters including at least one of the first shortest distance Ds1, the second shortest distance Ds2, the third shortest distance Ds3 or the fourth shortest distance Ds4. Figures 4A to 4C In the present display device, not only the interference between the cover window CF and the coating MCL can be eliminated, but also other defects such as cover window depression, curved portion cracking and light leakage can be effectively prevented or completely eliminated.

[0078] Figure 7 is a cross-sectional view around a curved portion of a display device according to some embodiments of the present disclosure. Figure 7 , in order to ensure that the signal lines in the bent portion PBP are not subjected to stress or reduced stress, a coating MCL is formed on the outer surface of the bent portion PBP to change the position of the neutral plane NP in the bent area. On the other hand, in order to improve the flexibility of the bent portion PBP, the back film is removed from the bent portion. For example, the bent portion PBP does not have any back film, for example, the first back film BF1 and the second back film BF2 do not exist in the area with the bent portion PBP. However, in the fan-out area FR, the first back film BF1 is retained to protect the signal lines therein. The inventors of the present disclosure have found that due to various engineering tolerances (for example, the material tolerance of the first back film BF1, the bonding tolerance of the first back film BF1, the bending tolerance of the bent portion PBP, the flow tolerance of the coating MCL, and the overlength of the neutral plane NP), the back film (such as the first back film BF1) and the bent portion PBP may interfere with each other. As Figure 7As shown, a second interference region Ri2 is formed, in which the first back film BF1 and the curved portion PBP interfere with each other, resulting in excessive force on the curved portion PBP. As used herein, the term "material tolerance" refers to the tolerance for the error or error range introduced by the material forming a part of the display device (such as the material forming the first back film BF1). As used herein, the term "bonding tolerance" refers to the tolerance for the error or error range when bonding two components of the display device (for example, when bonding the first back film BF1 to, for example, the display portion DP). This error may be caused by alignment errors when bonding the first back film BF1 to another component. As used herein, the term "bending tolerance" refers to the tolerance for the error or error range when bending one or more components of the display device (for example, when bending the curved portion PBP). As used herein, the term "flow tolerance" refers to the tolerance for the error or error range when forming the component due to the fact that the material forming the component of the display device is not completely solidified and is easy to flow. As used herein, the term "excess length of the neutral plane" refers to the excess length of the neutral plane.

[0079] In order to prevent this problem, the inventors of the present disclosure further improved the structure of the display device. Figure 8A is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure. Figure 8B is a partial view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure. Figure 8C is a partial plan view around an inclined portion of a coating in a display device according to some embodiments of the present disclosure. Figures 8A to 8C In some embodiments, the orthographic projection of an edge Ebf1 of the first back film BF1 adjacent to the bent portion PBP on the plane including the main surface Sm of the display portion DP is between the orthographic projection of a boundary B2 between the fan-out region FR and the bent portion PBP on the plane including the main surface Sm of the display portion DP and the orthographic projection of a bending line BL along which the bent portion PBP bends on the plane including the main surface Sm of the display portion DP. Furthermore, the orthographic projection of an edge Ebf1 of the first back film BF1 adjacent to the bent portion PBP on the plane including the main surface Sm of the display portion DP is also between the orthographic projection of a boundary B1 between the inclined portion Pt and the main portion Pm on the plane including the main surface Sm of the display portion DP and the orthographic projection of a bending line BL along which the bent portion PBP bends on the plane including the main surface Sm of the display portion DP.

[0080] In some embodiments, reference Figures 8A to 8C, a fifth shortest distance Ds5 between the orthographic projection of the edge Ebf1 of the first back film BF1 adjacent to the bent portion PBP on the plane including the main surface Sm of the display portion DP and the orthographic projection of the bending line BL on the plane including the main surface Sm of the display portion DP is equal to or greater than the third value.

[0081] In some embodiments, the third value may be represented as: Wherein, a is the bonding tolerance of the first backing film BF1; b is the bending tolerance of the curved portion PBP. Optionally, the bonding tolerance of the first backing film BF1 is in a range of 50 μm to 150 μm, for example, 50 μm to 75 μm, 75 μm to 100 μm, 100 μm to 125 μm, or 125 μm to 150 μm. Optionally, the bonding tolerance of the first backing film BF1 is 100 μm. Optionally, the bending tolerance of the curved portion PBP is in a range of 50 μm to 150 μm, for example, 50 μm to 75 μm, 75 μm to 100 μm, 100 μm to 125 μm, or 125 μm to 150 μm. Optionally, the bending tolerance of the curved portion PBP is 100 μm. Optionally, the third value is in a range of 150 μm to 200 μm, for example, 100 μm to 125 μm, 125 μm to 150 μm, 150 μm to 175 μm, or 175 μm to 200 μm. Optionally, the engineering tolerance of the inclined portion Pt is 200 μm. Optionally, the third value is 150 μm. Optionally, the fifth shortest distance Ds5 is equal to or greater than 150 μm.

[0082] In some embodiments, reference Figures 8A to 8C A sixth shortest distance Ds6 between an orthographic projection of an edge Ebf1 of the first back film BF1 adjacent to the bent portion PBP on a plane including the main surface Sm of the display portion DP and an orthographic projection of a boundary B2 between the fan-out region FR and the bent portion PBP on a plane including the main surface Sm of the display portion DP is equal to or greater than a fourth value, which is a composite tolerance calculated based on a bonding tolerance of the first back film BF1 and a material tolerance of the first back film BF1. Alternatively, the fourth value is in a range of 100 μm to 200 μm, for example, 100 μm to 125 μm, 125 μm to 150 μm, 150 μm to 175 μm, or 175 μm to 200 μm. Alternatively, the fourth value is 150 μm. Alternatively, the sixth shortest distance Ds6 is equal to or greater than 150 μm.

[0083] In some embodiments, reference Figures 8A to 8CA seventh shortest distance Ds7 between an orthographic projection of an edge Ebf1 of the first back film BF1 adjacent to the bent portion PBP on a plane including the main surface Sm of the display portion DP and an orthographic projection of an edge Ept of the polarizer PL adjacent to the inclined portion on a plane including the main surface Sm of the display portion DP is equal to or greater than a fifth value, which is the sum of a flow tolerance of the coating layer MCL, a bonding tolerance of the first back film BF1, and an excess length of a neutral plane NP of the structure including the bent portion PBP and the coating layer MCL. Optionally, the flow tolerance of the coating layer MCL is in a range of 150 μm to 250 μm, for example, 150 μm to 175 μm, 175 μm to 200 μm, 200 μm to 225 μm, or 225 μm to 250 μm. Optionally, the flow tolerance of the coating layer MCL is 200 μm. Optionally, the bonding tolerance of the first backing film BF1 is in the range of 50 μm to 150 μm, for example, 50 μm to 75 μm, 75 μm to 100 μm, 100 μm to 125 μm, or 125 μm to 150 μm. Optionally, the bonding tolerance of the first backing film BF1 is 100 μm. Optionally, the overhang length of the neutral plane NP is in the range of 50 μm to 150 μm, for example, 50 μm to 75 μm, 75 μm to 100 μm, 100 μm to 125 μm, or 125 μm to 150 μm. Optionally, the overhang length of the neutral plane NP is 100 μm. Optionally, the fifth value is in the range of 300 μm to 500 μm, for example, 300 μm to 350 μm, 350 μm to 400 μm, 400 μm to 450 μm, or 450 μm to 500 μm. Optionally, the fifth value is 400 μm. Optionally, the seventh shortest distance Ds7 is equal to or greater than 400 μm.

[0084] In some embodiments, reference Figures 8A to 8C , a distance d3 between an orthographic projection of an edge Ept of the inclined portion Pt adjacent to the polarizer PL on a plane including the main surface Sm of the display portion DP and an orthographic projection of a boundary B1 between the inclined portion Pt and the main portion on a plane including the main surface Sm of the display portion DP is less than 400 μm, for example, less than 390 μm, less than 380 μm, less than 370 μm, less than 360 μm or less than 350 μm.

[0085] Figure 9A In some embodiments according to the present disclosure, Figure 3 Magnified view of the area outlined by the dashed circle in . Figure 8A and Figure 9AIn some embodiments, the coating layer MCL covering the back side of the bent portion PBP extends a first spacing m1 on the first side S1 of the display portion DP and extends a second spacing m2 on the side of the connection portion CP opposite to the display portion DP. Optionally, the first spacing m1 and the second spacing m2 are respectively in the range of 150 μm to 250 μm, for example, 150 μm to 175 μm, 175 μm to 200 μm, 200 μm to 225 μm, or 225 μm to 250 μm. Optionally, the first spacing m1 is 200 μm and the second spacing m2 is 200 μm (see also FIG. Figure 4A ).

[0086] Figure 9B In some embodiments according to the present disclosure, Figure 3 Magnified view of the area outlined by the dashed circle in . Figure 8A and Figure 9B In some embodiments, the coating layer MCL covering the back side of the bent portion PBP extends a first distance m1 on the first side S1 of the display portion DP and extends a second distance m2 on the side of the connection portion CP opposite to the display portion DP. Optionally, the second distance m2 is greater than the first distance m1 (see also Figure 11 ).

[0087] Figure 10 is a cross-sectional view around a curved portion of a display device according to some embodiments of the present disclosure. Figure 10In some embodiments, the display device further includes a second optically transparent adhesive layer OCA2 between the first back film BF1 and the support layer SL (e.g., a metal support layer), the second optically transparent adhesive layer OCA2 adhering the first back film BF1 and the support layer SL together. Optionally, the display device further includes an adhesive layer AL between the metal plate MP and the second back film BF2, the adhesive layer AL adhering the metal plate MP and the second back film BF2 together. Optionally, the support layer SL has a thickness in the range of 30 μm to 50 μm, for example, 30 μm to 35 μm, 35 μm to 40 μm, 40 μm to 45 μm, or 45 μm to 50 μm. Optionally, the thickness of the metal plate MP is in the range of 0.5 mm to 2.5 mm, for example, 0.5 mm to 1.0 mm, 1.0 mm to 1.5 mm, 1.5 mm to 2.0 mm, 2.0 mm to 2.5 mm, 2.5 mm to 3.0 mm, 3.0 mm to 3.5 mm, 3.5 mm to 4.0 mm, 4.0 mm to 4.5 mm, or 4.5 mm to 5.0 mm. Optionally, the display device further includes an Embo-type adhesive layer EMBO between the support layer SL and the metal plate MP. The Embo-type adhesive layer EMBO attaches the support layer SL and the metal plate MP together. The Embo-type adhesive layer EMBO has a mesh pattern structure that facilitates the release of air between the support layer SL and the metal plate MP when the support layer SL and the metal plate MP are attached together. Optionally, the Embo-type adhesive layer EMBO has a thickness that is 1.5 to 2.5 times the thickness of the support layer SL.

[0088] Figure 11 is a cross-sectional view around a curved portion of a display device according to some embodiments of the present disclosure. Figure 11 In some embodiments, the display device further includes an adhesive layer AL between the metal plate MP and the second backing film BF2, the adhesive layer AL adhering the metal plate MP and the second backing film BF2 together. Optionally, the display device further includes a support layer SL between the metal plate MP and the first backing film BF1. Optionally, the support layer SL includes a double-layer structure. Optionally, the support layer SL includes a metal support layer MS and a foam layer FM. Optionally, the display device further includes an Embo-type adhesive layer EMBO between the metal support layer MS and the metal plate MP.

[0089] In some embodiments, the cover window CF of the display device has a multi-layer structure. Optionally, the multi-layer structure includes a first cover sublayer CF1 located on the side of the optically transparent adhesive layer OCA away from the polarizer PL, an ultra-thin glass UTG located on the side of the first cover sublayer CF1 away from the optically transparent adhesive layer OCA, and a second optically transparent adhesive layer OCA2 between the ultra-thin glass UTG and the first cover sublayer CF1, the second optically transparent adhesive layer OCA2 adhering the ultra-thin glass UTG and the first cover sublayer CF1 together. Optionally, the multi-layer structure also includes a second cover sublayer CF2 located on the side of the ultra-thin glass UTG away from the first cover sublayer CF1, and a third optically transparent adhesive layer OCA3 between the ultra-thin glass UTG and the second cover sublayer CF2, the third optically transparent adhesive layer OCA3 adhering the ultra-thin glass UTG and the second cover sublayer CF2 together. Optionally, the first cover sublayer CF1 and the second cover sublayer CF2 are made of an organic polymer (such as polyamine or polyethylene terephthalate). Optionally, the second cover sublayer CF2 further comprises a hard coating layer thereon. Optionally, the second cover sublayer CF2 further comprises a protective film.

[0090] like Figure 11 As shown, the orthographic projection of the second cover sublayer CF2 on the display portion DP covers the orthographic projection of the ultra-thin glass UTG on the display portion DP by up to a spacing. The orthographic projection of the third optically transparent adhesive layer OCA3 on the display portion DP and the orthographic projection of the ultra-thin glass UTG on the display portion DP substantially overlap with each other, for example, the edges of the third optically transparent adhesive layer OCA3 and the ultra-thin glass UTG near the coating MCL are flush with each other. The orthographic projection of the ultra-thin glass UTG on the display portion DP covers the orthographic projection of the second optically transparent adhesive layer OCA2 on the display portion DP by up to a spacing. The orthographic projection of the optically transparent adhesive layer OCA on the display portion DP and the orthographic projection of the polarizer PL on the display portion DP substantially overlap with each other, for example, the edges of the optically transparent adhesive layer OCA and the polarizer PL adjacent to the coating MCL are flush with each other.

[0091] Optionally, the orthographic projection of the first cover sublayer CF1 and the orthographic projection of the second cover sublayer CF2 on the display portion DP substantially overlap each other, and they cover the orthographic projection of the ultra-thin glass UTG on the display portion DP by up to a spacing.

[0092] Optionally, the optically transparent adhesive layer OCA has a thickness in the range of 10 μm to 50 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, or 40 μm to 50 μm. Optionally, the second optically transparent adhesive layer OCA2 has a thickness in the range of 10 μm to 50 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, or 40 μm to 50 μm. Optionally, the third optically transparent adhesive layer OCA3 has a thickness in the range of 10 μm to 50 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, or 40 μm to 50 μm. Optionally, the optically transparent adhesive layer OCA has a thickness of 25 μm. Optionally, the thickness of the second optically transparent adhesive layer OCA2 is 25 μm. Optionally, the thickness of the third optically transparent adhesive layer OCA3 is 25 μm.

[0093] Optionally, the ultra-thin glass UTG has a thickness in the range of 20 μm to 40 μm, for example, 20 μm to 25 μm, 25 μm to 30 μm, 30 μm to 35 μm, or 35 μm to 40 μm. Optionally, the ultra-thin glass UTG has a thickness of 30 μm.

[0094] Optionally, the first cover sublayer CF1 has a thickness in the range of 10 μm to 100 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, or 90 μm to 100 μm. Optionally, the first cover sublayer CF1 has a thickness of 50 μm. Optionally, the first cover sublayer CF1 has a thickness of 55 μm. Optionally, the second cover sublayer CF2 has a thickness in the range of 10 μm to 100 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, or 90 μm to 100 μm. Optionally, the second cover sublayer CF2 has a thickness of 50 μm. Optionally, the second cover sublayer CF2 has a thickness of 55 μm.

[0095] Optionally, the polarizer PL has a thickness ranging from 20 μm to 40 μm, for example, 20 μm to 25 μm, 25 μm to 30 μm, 30 μm to 35 μm, or 35 μm to 40 μm. Optionally, the polarizer PL has a thickness of 31 μm.

[0096] Optionally, the metal support layer MS has a thickness in the range of 20 μm to 250 μm, for example, 20 μm to 35 μm, 35 μm to 50 μm, 50 μm to 100 μm, 100 μm to 150 μm, 150 μm to 200 μm, or 200 μm to 250 μm. Optionally, the metal support layer MS has a thickness of 150 μm. Optionally, the metal support layer MS has a thickness of 40 μm.

[0097] Optionally, the foam layer FM has a thickness in the range of 50 μm to 210 μm, for example, 50 μm to 70 μm, 70 μm to 90 μm, 90 μm to 110 μm, 110 μm to 130 μm, 130 μm to 150 μm, 150 μm to 170 μm, 170 μm to 190 μm, or 190 μm to 210 μm. Optionally, the foam layer FM has a thickness of 150 μm. Optionally, the foam layer FM has a thickness of 120 μm.

[0098] Alternatively, the first backing film BF1 has a thickness in the range of 10 μm to 100 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, or 90 μm to 100 μm. Alternatively, the first backing film BF1 has a thickness of 50 μm. Optionally, the second backing film BF2 has a thickness in the range of 10 μm to 100 μm, for example, 10 μm to 20 μm, 20 μm to 30 μm, 30 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, or 90 μm to 100 μm. Optionally, the second backing film BF2 has a thickness of 50 μm.

[0099] Optionally, the display device further includes an ink layer between the first cover sublayer CF1 and the second optically transparent adhesive layer OCA2. Optionally, the display device further includes a second ink layer between the second cover sublayer CF2 and the third optically transparent adhesive layer OCA3. Optionally, the display device further includes a third ink layer between the ultra-thin glass UTG and the second optically transparent adhesive layer OCA3.

[0100] Optionally, the support layer SL includes a buffer material having a buffer function, for example, an organic material such as foam (for example, Figure 11 Optionally, the support layer SL comprises a silicone resin. Optionally, the support layer SL comprises a double-sided adhesive layer. Optionally, the support layer SL comprises a metal material, such as stainless steel. Optionally, the support layer SL comprises a foam layer and a polyethylene terephthalate layer. Figure 12FIG. 2 shows a partial stacking structure including a support layer in some embodiments according to the present disclosure. Figure 12 The support layer SL includes a foam layer FL and a polyethylene terephthalate layer PET. The display device further includes a second adhesive layer AL2 between the support layer SL and the metal support layer MS, and the second adhesive layer SL2 includes a pressure-sensitive adhesive material.

[0101] In some embodiments, the display device further includes a camera aperture. Optionally, the first cover sublayer CF1 (and optionally, the second cover sublayer CF2) covers the camera aperture. The camera aperture is below the first cover sublayer CF1 (and optionally, the second cover sublayer CF2). The camera aperture does not extend into the first cover sublayer CF1 (and optionally, the second cover sublayer CF2).

[0102] In some embodiments, the coating MCL covers the first portion of the first backing film BF1 up to a first spacing, and covers the second portion of the second backing film BF2 up to a second spacing. Optionally, the first spacing and the second spacing are different. Optionally, the first spacing is greater than the second spacing. Optionally, the second spacing is greater than the first spacing.

[0103] Reference Figure 4A 、 Figure 4B and Figure 11 In some embodiments, the orthographic projection of the edge Ecf of the cover window CF on the plane including the main surface Sm of the display portion DP is between the orthographic projection of the edge Ept of the adjacent polarizer PL of the inclined portion Pt on the plane including the main surface Sm of the display portion DP and the orthographic projection of the boundary B1 between the inclined portion Pt and the main portion Pm on the plane including the main surface Sm of the display portion DP. Alternatively, the orthographic projection of the edge Ept of the adjacent polarizer PL of the inclined portion Pt on the plane including the main surface Sm of the display portion DP is between the orthographic projection of the edge Ecf of the cover window CF on the plane including the main surface Sm of the display portion DP and the orthographic projection of the edge of the polarizer PL on the plane including the main surface Sm of the display portion DP. Optionally, the orthographic projection of the edge Eoca connecting the first adhesive surface Sa1 and the second adhesive surface Sa2 on the plane including the main surface Sm of the display part DP is aligned with the orthographic projection of the edge of the adjacent inclined portion Pt of the polarizer PL on the plane including the main surface Sm of the display part DP, or is between the orthographic projection of the edge of the adjacent inclined portion Pt of the polarizer PL on the plane including the main surface Sm of the display part DP and the orthographic projection of the edge Ecf of the adjacent inclined portion Pt of the cover window Cf on the plane including the main surface Sm of the display part DP.

[0104] Figure 13A is a cross-sectional view around a curved portion of a display device in some embodiments according to the present disclosure. Figure 13AThe structure of the display device Figure 11 The structure of the display device is similar to that of the display device, except that the layer between the first back film BF1 and the second back film BF2 is different. Referring to Figure 13, in some embodiments, the display device includes a support layer SL located on the side of the first back film BF1 away from the display portion DP; a metal plate MP located on the side of the support layer SL away from the first back film BF1; and a double-sided adhesive layer DAL between the metal plate MP and the second back film BF2. The double-sided adhesive layer DAL adheres the metal plate MP to the second back film BF2. Optionally, the support layer SL includes a buffer material having a buffering function, for example, an organic material such as foam (e.g., a foam layer).

[0105] Figure 13B is a plan view of the support layer, the first backing film and the metal plate in some embodiments according to the present disclosure. Figure 13A and Figure 13B In some embodiments, the orthographic projection of the metal plate MP on the display portion DP covers the orthographic projection of the support layer SL on the display portion DP by up to a distance. Alternatively, the orthographic projection of the first back film BF1 on the display portion DP covers the orthographic projection of the metal plate MP on the display portion DP by up to a distance.

[0106] On the other hand, the present disclosure provides a method for manufacturing a display device. In some embodiments, the method includes forming a structure including a display panel, the display panel having a display portion in a display area, a connecting portion, and a curved portion connecting the display portion and the connecting portion, wherein the flexible base substrate extends through the display portion, the curved portion, and the connecting portion as a substantially flat integral structure; forming a polarizer on a first side of the display portion; forming a cover window on a first side of the display portion and on a side of the polarizer away from the display portion; forming a back film covering the surface of the flexible base substrate; removing a portion of the back film in an area having a curved portion, thereby forming a first back film covering the surface of the display portion and a second back film covering the surface of the connecting portion; bending the curved portion so that the first back film faces the second back film, thereby forming a curved cavity surrounded by the curved portion; providing a metal plate between the display portion and the connecting portion; providing a support layer (e.g., a metal support layer) between the display portion and the connecting portion; forming a coating covering the back side of the curved portion opposite to the side directly surrounding the curved cavity. Optionally, the coating is formed to have a main portion and an inclined portion extending from the main portion toward the polarizer. Optionally, the height of the inclined portion relative to the main surface of the display portion on the first side gradually increases from an edge of the inclined portion adjacent to the polarizer to a boundary between the inclined portion and the main portion. Optionally, the boundary is the boundary at which the inclined portion reaches its maximum height relative to the main surface of the display portion on the first side. Optionally, the boundary is a boundary coplanar with the edge of the first backing film facing the curved cavity. Optionally, the orthographic projection of the cover window onto a plane including the main surface of the display portion is between the orthographic projection of the edge of the inclined portion adjacent to the polarizer on a plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on a plane including the main surface of the display portion. Optionally, a first shortest distance between the orthographic projection of the edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion and the orthographic projection of the edge of the inclined portion adjacent to the polarizer on a plane including the main surface of the display portion is equal to or greater than a first value. Optionally, a second shortest distance between the orthographic projection of the edge of the cover window adjacent to the inclined portion on a plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on a plane including the main surface of the display portion is also equal to or greater than the first value. As used herein, the term "substantially planar" may include small deviations from a planar surface geometry, such as deviations due to manufacturing processes.

[0107] 14A to 14D A method of manufacturing a display device in some embodiments is shown. Figure 14A, forming a structure having a display portion DP, a connection portion CP, and a curved portion PBP connecting the display portion DP and the connection portion CP in the display region DR. In this structure, the flexible base substrate FBS extends as a substantially flat, integral structure through the display portion DP, the curved portion PBP, and the connection portion CP. A back film BF is formed to cover a surface of the flexible base substrate FBS, for example, the surface of the flexible base substrate FBS located on the side away from the cover window CF. A polarizer PL is formed on the first side S1 of the display portion DP. An optically transparent adhesive layer OCA is formed on the first side S1 of the display portion DP and on the side of the polarizer PL away from the display portion DP. The cover window CF is located on the first side S1 of the display portion DP and on the side of the optically transparent adhesive layer OCA away from the polarizer PL. The optically transparent adhesive layer OCA is formed between the polarizer PL and the cover window CF, adhering the cover window CF to the polarizer PL.

[0108] Reference Figure 14B A portion of the back film in the region having the bent portion PBP is then removed, thereby forming a first back film BF1 covering the surface of the display portion DP and a second back film BF2 covering the surface of the connection portion CP.

[0109] Reference Figure 14C , and then the bent portion PBP is bent so that the first back film BF1 faces the second back film BF2, thereby forming a bent cavity CPb surrounded by the bent portion PBP.

[0110] Reference Figure 14D , a metal plate MP is between the display part DP and the connection part CP; and a support layer SL (eg, a metal support layer) is between the display part DP and the connection part CP.

[0111] Reference Figure 14E , forming a coating MCL that covers the back side SDB of the curved portion PBP opposite to the side SDPs directly surrounding the curved cavity cpb. Figure 14E As shown, the coating MCL is formed to have a main portion Pm and an inclined portion Pt extending from the main portion Pm toward the polarizer PL. Figure 14E 、 Figure 4A 、 Figure 4B and Figure 4C, the height of the inclined portion Pt relative to the main surface Sm of the display portion DP on the first side S1 gradually increases from the edge Ept of the inclined portion Pt adjacent to the polarizer PL to the boundary B1 between the inclined portion Pt and the main portion Pm. Optionally, the boundary B1 is the boundary at which the inclined portion Pt has the maximum height relative to the main surface Sm of the display portion DP on the first side S1. Optionally, the boundary B1 is a boundary coplanar with the edge of the first back film BF1 facing the curved cavity Cpb. The orthographic projection of the cover window CF on the plane including the main surface Sm of the display portion DP is between the orthographic projection of the edge Ept of the adjacent polarizer PL of the inclined portion Pt on the plane including the main surface Sm of the display portion SP and the orthographic projection of the boundary B1 between the inclined portion Pt and the main portion Pm on the plane including the main surface Sm of the display portion DP.

[0112] Optionally, a first shortest distance Ds1 between an orthographic projection of an edge Epl of the polarizer PL adjacent to the inclined portion Pt on a plane including the main surface Sm of the display portion DP and an orthographic projection of an edge Ept of the polarizer PL adjacent to the inclined portion Pt on a plane including the main surface Sm of the display portion DP is equal to or greater than a first value. Optionally, a second shortest distance Ds2 between an orthographic projection of an edge Ecf of the cover window adjacent to the inclined portion Pt on a plane including the main surface Sm of the display portion DP and an orthographic projection of a boundary B1 between the inclined portion Pt and the main portion Pm on a plane including the main surface Sm of the display portion DP is also equal to or greater than the first value.

[0113] In some embodiments, the method further comprises forming a stacked structure, wherein the connection portion CP and the display portion DP are part of the stacked structure in the display device. Figure 14E , the display portion DP can be used as a reference for describing the structure of the stacked structure. On the first side S1 of the display portion DP (the side displaying the luminous image), in some embodiments, forming the stacked structure includes one or more of the following steps: forming a polarizer PL on the display portion DP; forming an optically transparent adhesive layer OCA on the side of the polarizer PL away from the display portion DP; and forming a cover window CF on the side of the optically transparent adhesive layer OCA away from the polarizer PL. An optically transparent adhesive layer OCA is formed to attach the cover window CF to the polarizer. On the second side S2 (back side) of the display portion DP, in some embodiments, forming the stacked structure includes one or more of the following steps: forming a first back film BF1 on the back side Sb of the second side S2 of the display portion DP, disposing a supporting layer SL on the side of the first back film BF1 away from the display portion DP; disposing a metal plate MP on the side of the supporting layer SL away from the first back film BF1; forming a second back film BF2 on the side of the metal plate MP away from the supporting layer SL; and forming a connecting portion CP on the side of the second back film BF2 away from the metal plate MP.

[0114] The first and second backing films can be made using various suitable materials and various suitable manufacturing methods. For example, a flexible organic polymer material can be used to form the first and second backing films. Examples of suitable flexible organic polymer materials include, but are not limited to, polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, and fiber-reinforced plastic.

[0115] The flexible base substrate can be manufactured using various suitable materials and various suitable manufacturing methods. For example, a flexible organic polymer material can be used to form the flexible base substrate. Examples of suitable flexible organic polymer materials include, but are not limited to, polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, and fiber-reinforced plastic.

[0116] Various suitable materials and various suitable manufacturing methods can be used to manufacture the coating. For example, UV curable adhesive materials can be used to form the coating. The example of UV curable adhesive includes UV curable adhesive materials, which include a photoinitiator that generates free radicals and a compound with multiple unsaturated groups (such as acrylate, methacrylate or vinyl group), such as an oligomer with multiple unsaturated groups, and optionally, a monomer with multiple unsaturated groups. The specific example of the photoinitiator that generates free radicals includes, for example, Type I or Type II photoinitiators, such as benzoin ether, 1-hydroxy-cyclohexylphenyl-ketone or benzophenone. The specific example of the oligomer with multiple unsaturated groups includes acrylate oligomers, such as epoxy acrylate (for example, bisphenol-A-epoxy acrylate), aliphatic urethane acrylate (for example IPDI-based aliphatic urethane acrylate), aromatic urethane acrylate, polyether acrylate, polyester acrylate, aminated acrylate and acrylic acrylate. Specific examples of monomers include monofunctional, difunctional, and trifunctional monomers, such as trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, tripropylene glycol diacrylate, hexylene glycol diacrylate, isobornyl acrylate, isodecyl acrylate, ethoxylated acrylates, and phenoxyethyl acrylate. Other examples of UV-curable adhesives include UV-curable adhesive materials containing cationic photoinitiators and epoxides. Specific examples of cationic photoinitiators include onium salts, such as arylsulfonium and aryliodonium salts. Specific examples of epoxy compounds include alicyclic epoxy compounds and aromatic epoxy compounds, such as 3,4-epoxy-cyclohexylmethyl-3,4-epoxy-cyclohexane-carboxylate and bisphenol A diglycidyl ether, as well as polysiloxanes having epoxy groups.

[0117] The optically clear adhesive layer OCA can be manufactured using various suitable materials and various suitable manufacturing methods. Examples of suitable optically clear adhesive materials include, but are not limited to, polypropylene, such as polymethyl methacrylate (PMMA); olefin copolymers; polycarbonate; epoxy resin; silicone-based optically clear adhesive materials; or combinations thereof.

[0118] The Embo-type adhesive layer EMBO can be manufactured using various suitable materials and various suitable manufacturing methods. Examples of suitable Embo-type adhesive materials include, but are not limited to, polypropylene, such as polymethyl methacrylate (PMMA); olefin copolymers; polycarbonate; epoxy resin; optically transparent adhesive materials based on silicone; or combinations thereof.

[0119] The cover window CF and the second cover window CF2 can be manufactured using various appropriate materials and various appropriate manufacturing methods. Examples of appropriate materials for manufacturing the cover window CF and the second cover window CF2 include, but are not limited to, polyamine (e.g., colorless polyamine), thin glass, ultrathin glass, polyethylene terephthalate, polyacrylate, polymethyl methacrylate, polycarbonate, polyethylene naphthalate, polyvinylidene chloride, polyvinylidene fluoride, polystyrene, vinyl alcohol copolymer and / or combinations thereof. Optionally, the cover window CF or the second cover window CF2 has a double-layer structure, including a first sublayer, a second sublayer, and an adhesive sublayer for adhering the first sublayer and the second sublayer together. Optionally, the first sublayer and the second sublayer are made of colorless polyamine, and the adhesive sublayer is an optically transparent adhesive sublayer. Optionally, the cover window CF or the second cover window CF2 also includes a hard coating sublayer. Optionally, the cover window CF or the second cover window CF2 also includes a protective film. Optionally, the first sublayer has a thickness in the range of 60 μm to 120 μm, for example, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, 90 μm to 100 μm, 100 μm to 110 μm, or 110 μm to 120 μm. Optionally, the second sublayer has a thickness in the range of 60 μm to 120 μm, for example, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, 90 μm to 100 μm, 100 μm to 110 μm, or 110 μm to 120 μm. Optionally, the adhesive sublayer has a thickness in the range of 30 μm to 70 μm, for example, 30 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, or 60 μm to 70 μm. Optionally, the hard coat sub-layer has a thickness in the range of 5 μm to 15 μm, for example 5 μm to 10 μm, or 10 μm to 15 μm.

[0120] The adhesive layer AL and the second adhesive layer AL2 can be manufactured using various suitable materials and various suitable manufacturing methods. For example, a pressure-sensitive adhesive material can be used to form the adhesive layer AL and the second adhesive layer AL2. Examples of suitable pressure-sensitive adhesive materials include, but are not limited to, acrylate-based adhesive materials, such as homopolymers and copolymers of acrylic acid, methacrylic acid, isooctyl acrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, isoamyl methacrylate, 2-ethyl hexylacrylate, and butyl acrylate.

[0121] The support layer can be made of various suitable materials and various suitable manufacturing methods. Optionally, the support layer includes an organic material layer (e.g., Figure 11 The support layer may include a foam layer FM in the foam layer FM). For example, an organic polymer material may be used to form the organic material layer (e.g., the foam layer FM). Examples of suitable organic polymer materials include, but are not limited to, polyethylene terephthalate. Alternatively, the support layer includes a metal support layer. The metal support layer may be manufactured using various suitable materials and various suitable manufacturing methods. For example, a metal material may be used to form the metal support layer. Examples of suitable metal materials include, but are not limited to, aluminum and copper, as well as various suitable alloys or laminates.

[0122] The metal plate can be made using various suitable materials and various suitable manufacturing methods. For example, a metal material can be used to form the metal plate. Examples of suitable metal materials include, but are not limited to, aluminum and copper, as well as various suitable alloys or laminates.

[0123] The foregoing description of the embodiments of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms or exemplary embodiments disclosed. Therefore, the foregoing description should be considered illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to those skilled in the art. The embodiments have been chosen and described to explain the principles of the invention and its best mode practical application, thereby enabling those skilled in the art to understand the various embodiments of the invention and various modifications as are suited to the particular use or implementation contemplated. The scope of the present invention is intended to be defined by the appended claims and their equivalents, in which all terms are to be used in their broadest reasonable sense unless otherwise indicated. Therefore, the terms "the invention," "the present invention," etc. do not necessarily limit the scope of the claims to the specific embodiments, and reference to exemplary embodiments of the present invention is not intended to limit the invention, and no such limitation should be inferred. The present invention is limited solely by the spirit and scope of the appended claims. Furthermore, the claims may use terms such as "first," "second," etc. followed by a noun or element. These terms should be understood as nomenclature and should not be construed to limit the number of elements modified by such nomenclature unless a specific number is provided. Any advantages and benefits described may not apply to all embodiments of the present invention. It should be understood that those skilled in the art may make changes to the described embodiments without departing from the scope of the invention as defined by the appended claims. In addition, elements and assemblies in this disclosure are not intended to be contributed to the public, regardless of whether these elements or assemblies are clearly stated in the appended claims.

Claims

1. A display device comprising: A display panel comprising a display portion, a connecting portion, and a curved portion; a polarizer located on a first side of the display portion; a cover window, the cover window being located on the first side of the display portion and on a side of the polarizer away from the display portion; a coating comprising a main portion and an inclined portion extending from the main portion toward the polarizer, wherein the curved portion connects the display portion and the connecting portion, the curved portion being bent so that the connecting portion faces a second side of the display portion, forming a curved cavity surrounded by the curved portion, the second side being opposite to the first side, the coating covering a back side of the curved portion opposite to a side directly surrounding the curved cavity; the height of the inclined portion relative to the main surface of the display portion on the first side gradually increases from an edge of the inclined portion adjacent to the polarizer to a boundary between the inclined portion and the main portion; and an optically transparent adhesive layer located on the first side of the display portion and between the polarizer and the cover window, the optically transparent adhesive layer attaching the cover window to the polarizer, wherein the optically transparent adhesive layer has a first adhesive surface at least partially attached to the cover window, a second adhesive surface at least partially attached to the polarizer, and an edge connecting the first adhesive surface and the second adhesive surface and adjacent to the inclined portion; The sum of the thickness of the optically clear adhesive layer and the thickness of the polarizer is greater than or equal to the maximum thickness of the coating layer; the orthographic projection of the edge of the cover window on the plane including the main surface of the display portion is located between the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on the plane including the main surface of the display portion; wherein an orthographic projection of an edge of the inclined portion adjacent to the polarizer on a plane including the main surface of the display portion is between an orthographic projection of an edge of the cover window on a plane including the main surface of the display portion and an orthographic projection of an edge of the polarizer on a plane including the main surface of the display portion; as well as An orthographic projection of an edge connecting the first adhesive surface and the second adhesive surface on a plane including the main surface of the display portion is aligned with an orthographic projection of an edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion, or is between an orthographic projection of the edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion and an orthographic projection of an edge of the cover window adjacent to the inclined portion on a plane including the main surface of the display portion.

2. The display device according to claim 1, wherein A first shortest distance between an orthographic projection of an edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion and an orthographic projection of an edge of the polarizer adjacent to the inclined portion on a plane including the main surface of the display portion is equal to or greater than a first value.

3. The display device according to claim 1 , wherein a fourth shortest distance between an orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on a plane including the main surface of the display portion and an orthographic projection of the edge of the cover window adjacent to the inclined portion on a plane including the main surface of the display portion is equal to or greater than a second value.

4. The display device according to claim 1 , wherein a second shortest distance between an orthographic projection of an edge of the cover window adjacent to the inclined portion on a plane including the main surface of the display portion and an orthographic projection of a boundary between the inclined portion and the main portion on a plane including the main surface of the display portion is also equal to or greater than the first value.

5. The display device according to claim 1 , wherein a third shortest distance between an orthographic projection of the edge connecting the first adhesive surface and the second adhesive surface on a plane including the main surface of the display portion and an orthographic projection of the virtual contour line on the plane including the main surface of the display portion is also equal to or greater than a first value; The virtual contour line is on the surface of the inclined portion; and A height of the virtual outline relative to the main surface of the display portion on the first side is equal to a height of the second adhesive surface relative to the main surface of the display portion on the first side. The display device of claim 3 , wherein the second value is equal to a bonding tolerance of the optically transparent adhesive layer. 7 . The display device according to claim 3 , wherein the second value is in the range of 100 μm to 200 μm.

8. The display device according to claim 2, 4 or 5, wherein the first value is equal to an engineering tolerance of the inclined portion. 9 . The display device according to claim 8 , wherein the first value is in the range of 150 μm to 250 μm. 10 . The display device according to claim 1 , further comprising a bezel covering the coating layer and located on a side of the coating layer away from the bent portion, the bezel being connected to the cover window.

11. The display device according to claim 1 , further comprising a first backing film covering a back surface of the display portion on the second side; in, The display portion has a display area that displays an image and a fan-out area between the display area and the bending portion, the display portion including a plurality of signal lines extending through the fan-out area; and The orthographic projection of the edge of the first back film adjacent to the curved portion on the plane including the main surface of the display portion is between the orthographic projection of the boundary between the fan-out area and the curved portion on the plane including the main surface of the display portion and the orthographic projection of the bending line along which the curved portion is bent on the plane including the main surface of the display portion.

12. The display device according to claim 11, wherein The fifth shortest distance between the orthographic projection of the edge of the first back film adjacent to the bent portion on the plane including the main surface of the display portion and the orthographic projection of the bending line on the plane including the main surface of the display portion is equal to or greater than a third value, the third value being equal to a is the bonding tolerance of the first backing film; as well as b is the bending tolerance of the bent portion. 13 . The display device according to claim 12 , wherein the third value is in the range of 100 μm to 200 μm.

14. The display device according to any one of claims 11 to 13, wherein: A sixth shortest distance between an orthographic projection of an edge of the first back film adjacent to the bent portion on a plane including the main surface of the display portion and an orthographic projection of a boundary between the fan-out area and the bent portion on a plane including the main surface of the display portion is equal to or greater than a fourth value, wherein the fourth value is a composite tolerance calculated based on the bonding tolerance of the first back film and the material tolerance of the first back film. 15 . The display device according to claim 14 , wherein the fourth value is in the range of 100 μm to 200 μm.

16. A display device according to any one of claims 11 to 13, wherein the seventh shortest distance between the orthographic projection of the edge of the first back film adjacent to the curved portion on the plane including the main surface of the display portion and the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion is equal to or greater than a fifth value, and the fifth value is the sum of the flow tolerance of the coating, the bonding tolerance of the first back film and the excess length of the neutral plane of the structure including the curved portion and the coating. 17 . The display device according to claim 16 , wherein the fifth value is in the range of 300 μm to 500 μm.

18. A display device according to claim 1, wherein the distance between the orthographic projection of the edge of the inclined portion adjacent to the polarizer on the plane including the main surface of the display portion and the orthographic projection of the boundary between the inclined portion and the main portion on the plane including the main surface of the display portion is less than 400 μm.

19. The display device according to claim 1 , wherein the coating covering the back side of the bent portion extends a first distance on the first side of the display portion and extends a second distance on a side of the connecting portion opposite to the display portion; and The first pitch and the second pitch are respectively in the range of 150 μm to 250 μm.

20. The display device according to claim 1, wherein The connecting portion and the display portion are part of a stacked structure in the display device; Wherein, on the first side of the display portion, the stacked structure includes one or more of the following: a polarizer on the display portion; an optically transparent adhesive layer, the optically transparent adhesive layer being located on a side of the polarizer away from the display portion; and a cover window located on a side of the optically clear adhesive layer away from the polarizer, wherein the optically clear adhesive layer adheres the cover window to the polarizer; Wherein, on the second side of the display portion, the stacked structure includes one or more of the following: a first back film on a back surface of the display portion on the second side; a supporting layer, located on a side of the first backing film away from the display portion; a metal plate located on a side of the support layer away from the first backing film; a second backing film located on a side of the metal plate away from the supporting layer; and The connecting portion is located on a side of the second backing film away from the metal plate.

21. The display device according to claim 20, wherein an orthographic projection of an edge of the supporting layer on the display portion substantially overlaps with an orthographic projection of an edge of the first backing film on the display portion; and The orthographic projection of the supporting layer on the display portion covers the orthographic projection of the metal plate on the display portion by a distance.

22. The display device according to claim 20, further comprising: a second optically clear adhesive layer, the second optically clear adhesive layer being between the first backing film and the support layer, the second optically clear adhesive layer adhering the first backing film and the support layer together; as well as An adhesive layer is provided between the metal plate and the second backing film, and the adhesive layer adheres the metal plate and the second backing film together.

23. The display device according to claim 20, further comprising: an adhesive layer between the metal plate and the second backing film, the adhesive layer adhering the metal plate and the second backing film together; Ultra-thin glass, located on a side of the cover window away from the display portion; a second optically clear adhesive layer, the second optically clear adhesive layer being between the ultra-thin glass and the cover window, the second optically clear adhesive layer adhering the ultra-thin glass and the cover window together; a second cover window, located on a side of the ultra-thin glass away from the cover window; as well as A third optically transparent adhesive layer is disposed between the ultra-thin glass and the second cover window, and the third optically transparent adhesive layer adheres the ultra-thin glass and the second cover window together.

Images