Display module, preparation method thereof, and display device

Abstract

An embodiment of the present disclosure provides a display module, including a display panel; a cover plate disposed on the light-emitting side of the display panel; a heat dissipation layer disposed on the back side of the display panel; the back side facing away from the light-emitting side; the four peripheral edge regions of the cover plate, the display panel, and the heat dissipation layer are bent toward the back side of the display panel to form arc surfaces with matching shapes; the display panel further includes a flat portion; the four peripheral edge regions of the display panel surround the periphery of the flat portion; at least part of the orthographic projection edge line of the display module on the plane where the flat portion of the display panel is located is an arc; the heat dissipation layer is provided with a telescopic structure in the arc surface region having the arc edge.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of display, and particularly relate to a display module, a preparation method thereof, and a display device. Background Art

[0002] At present, bendable, foldable, and stretchable OLED flexible display devices are being actively developed. In the disclosed technology, the edge area on the display side of the display screen is set as an arc surface, and each corner of the display screen is set as a rounded corner. A heat dissipation film is attached to the back side of the display screen to timely conduct and release the heat generated during the display of the display screen. When the heat dissipation film is attached to the curved surface at the four corners, the four corner positions are in a compressed state, and the heat dissipation film itself does not have stretchability, so the excess part of the heat dissipation film is likely to form wrinkles, resulting in bubbles between the heat dissipation film and the display screen, and the wrinkles during the attachment of the heat dissipation film are likely to cause defects such as cracks in the display screen. Summary of the Invention

[0003] The embodiments of the present disclosure provide a display module, a preparation method thereof, and a display device.

[0004] In a first aspect, the embodiments of the present disclosure provide a display module, including a display panel;

[0005] A cover plate disposed on the light-emitting side of the display panel;

[0006] A heat dissipation layer disposed on the back side of the display panel; the back side faces away from the light-emitting side;

[0007] The four peripheral edge regions of the cover plate, the display panel, and the heat dissipation layer are bent towards the back side of the display panel to form arc surfaces with matching shapes;

[0008] The display panel further includes a flat portion; the four peripheral edge regions of the display panel surround the periphery of the flat portion;

[0009] At least a part of the orthographic projection edge line of the display module on the plane where the flat portion of the display panel is located is an arc;

[0010] The heat dissipation layer is provided with a telescopic structure in the arc surface region having an arc edge.

[0011] In some embodiments, the heat dissipation layer includes a heat conduction film, and the telescopic structure includes through holes opened in the heat conduction film.

[0012] In some embodiments, the number of the through holes is multiple, and the multiple through holes are arranged in an array along the extending direction of the arc edge.

[0013] In some embodiments, within the arc surface region having the arc edge, the through holes are evenly distributed.

[0014] In some embodiments, within the arc-shaped region having the arc-shaped edge, the opening areas of the through holes are the same, and the spacing between the through holes closer to the center of the heat dissipation layer is greater than the spacing between the through holes farther from the center of the heat dissipation layer.

[0015] In some embodiments, within the arc-shaped region having the arc-shaped edge, the spacing between the through holes is the same, and the opening area of the through hole closer to the center of the heat dissipation layer is smaller than the opening area of the through hole farther from the center of the heat dissipation layer.

[0016] In some embodiments, the opening size of the through hole ranges from 0.5 to 1.5 mm.

[0017] In some embodiments, the shape of the orthographic projection of the through hole on the display panel includes any one or more of a circle, an ellipse, a rectangle, a rhombus, and a regular polygon.

[0018] In some embodiments, the heat-conducting film is made of any one of copper, aluminum, silver, and gold.

[0019] In some embodiments, the heat dissipation layer further includes an electromagnetic shielding film, the electromagnetic shielding film is disposed on a side of the heat-conducting film away from the display panel, and the electromagnetic shielding film at least covers the through holes on the heat-conducting film.

[0020] In some embodiments, the electromagnetic shielding film is made of any one of copper, aluminum, silver, and gold.

[0021] In some embodiments, the heat dissipation layer further includes a protective film, the protective film is disposed on a side of the electromagnetic shielding film away from the display panel, and the orthographic projection of the protective film on the display panel coincides with the orthographic projection of the electromagnetic shielding film on the display panel.

[0022] In some embodiments, for the arc-shaped region portion of the protective film having the arc-shaped edge, in a direction from one end away from the arc-shaped edge towards the arc-shaped edge, the thickness of the arc-shaped region portion gradually decreases.

[0023] In some embodiments, the thickness of the arc-shaped region portion of the protective film having the arc-shaped edge is smaller than the thickness of other portions of the protective film.

[0024] In some embodiments, the protective film is made of a polyolefin material.

[0025] In some embodiments, the heat dissipation layer further includes an adhesive film, the adhesive film is disposed on a side of the heat-conducting film close to the display panel, and the orthographic projection of the adhesive film on the display panel coincides with the orthographic projection of the electromagnetic shielding film on the display panel.

[0026] In some embodiments, for the arc surface region portion of the bonding film having the arc edge, in the direction from one end far away from the arc edge towards the arc edge, the thickness of the arc surface region portion gradually decreases.

[0027] In some embodiments, the thickness of the arc surface region portion of the bonding film having the arc edge is less than the thickness of other portions of the bonding film.

[0028] In some embodiments, the bonding film uses a stretchable adhesive material.

[0029] In a second aspect, an embodiment of the present disclosure provides a display device, including the above-mentioned display module.

[0030] In a third aspect, an embodiment of the present disclosure further provides a method for manufacturing a display module, including: preparing a cover plate; bending the four peripheral edge regions of the cover plate towards one side of the cover plate surface to form an arc surface;

[0031] preparing a display panel;

[0032] preparing a heat dissipation layer;

[0033] arranging the display panel inside the cover plate, and the display panel is adapted to the shape of the cover plate; the inner side of the cover plate is the inner side of the arc surface opening; and the cover plate is located on the light-emitting side of the display panel; the display panel includes a flat portion and four peripheral edge regions surrounding the flat portion;

[0034] arranging the heat dissipation layer on the back side of the display panel, and the heat dissipation layer is adapted to the shape of the display panel; the back side of the display panel faces away from its light-emitting side;

[0035] At least part of the orthographic projection edge line of the display module on the plane where the flat portion of the display panel is located is an arc;

[0036] The preparation of the heat dissipation layer includes preparing a stretchable structure in the arc surface region of the heat dissipation layer having an arc edge.

[0037] In some embodiments, the preparation of the heat dissipation layer includes preparing a heat conduction film;

[0038] The preparation of the stretchable structure includes opening through holes in the heat conduction film by using an etching process or a punching process. Description of the Drawings

[0039] The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure, and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation to the present disclosure. By describing the detailed exemplary embodiments with reference to the accompanying drawings, the above and other features and advantages will become more apparent to those skilled in the art. In the accompanying drawings:

[0040] Figure 1 It is a schematic structural diagram of a display screen in the disclosed technology;

[0041] Figure 2 It is a schematic cross-sectional structural diagram of a heat dissipation layer in the disclosed technology;

[0042] Figure 3 It is a schematic top view of the structure of a display module in an embodiment of the present disclosure;

[0043] Figure 4 It is Figure 3 a schematic cross-sectional structural diagram of the display module along the AA cutting line in;

[0044] Figure 5 It is a schematic top view of the structure of another display module in an embodiment of the present disclosure;

[0045] Figure 6 It is a schematic top view of the structure of yet another display module in an embodiment of the present disclosure;

[0046] Figure 7 It is a schematic top view of the structure of a heat dissipation layer in an embodiment of the present disclosure;

[0047] Figure 8 It is Figure 7 a schematic cross-sectional structural diagram of the heat dissipation layer along the BB cutting line in;

[0048] Figure 9 It is Figure 7 a magnified top view of part C of the heat conduction film in the heat dissipation layer in;

[0049] Figure 10 It is Figure 7 another magnified top view of part C of the heat conduction film in the heat dissipation layer in;

[0050] Figure 11 It is Figure 7 yet another magnified top view of part C of the heat conduction film in the heat dissipation layer in;

[0051] Figure 12 It is Figure 3 a schematic cross-sectional structural diagram of the heat dissipation layer along the AA cutting line in;

[0052] Figure 13 It is Figure 3 another schematic cross-sectional structural diagram of the heat dissipation layer along the AA cutting line in;

[0053] Figure 14 For Figure 3 Figure 3 Another structural sectional view of the heat dissipation layer along the AA cutting line;

[0054] Figure 15 For Figure 3 Figure 3 Another structural sectional view of the heat dissipation layer along the AA cutting line;

[0055] Figure 16 For Figure 3 Figure 3 Structural sectional view of the display panel along the AA cutting line.

[0056] Wherein the reference numerals are:

[0057] 1. Display panel; 101. Light-emitting side; 102. Back side; 11. Flexible substrate; 12. Pixel circuit layer; 13. Light-emitting element; 14. Encapsulation layer; 15. Touch electrode layer; 16. Polarizer; 6. OCA optical adhesive; 2. Cover plate; 3. Heat dissipation layer; 103. Curved surface area with arc-shaped edge; 300. Stretchable structure; 31. Thermal conductive film; 301. Through hole; 32. Electromagnetic shielding film; 33. Protective film; 34. Adhesive film; 4. Display screen; 35. Copper foil; 36. Release film; 5. Fold. Detailed implementation manners

[0058] To enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the following further describes in detail a display module, a manufacturing method thereof, and a display device provided by the embodiments of the present disclosure with reference to the accompanying drawings and specific implementation manners.

[0059] Hereinafter, the embodiments of the present disclosure will be described more fully with reference to the accompanying drawings. However, the illustrated embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0060] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications to the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings have schematic attributes, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions, but are not intended to be restrictive.

[0061] Currently, in order to achieve borderless full-screen display, the four peripheral edge regions on the display side of the display screen are usually set as curved surfaces, and the four corners of the display screen are set as rounded corners. In this way, during display, the four peripheral corner positions of the entire display screen can all perform picture display, thereby achieving borderless full-screen display, and at the same time increasing the effective display area of the display screen.

[0062] Such as Figure 1As shown, when manufacturing the display screen 4 that can be displayed at all four corner positions, a flexible display screen that can be bent and deformed is usually arranged inside a glass cover plate 2 whose periphery is bent into an arc surface. Then, a heat dissipation layer is attached to the side of the display screen 4 facing away from the glass cover plate 2 to conduct and release the heat generated during the display of the display screen in a timely manner. As Figure 2 shown, the heat dissipation layer 3 generally includes a whole piece of copper foil 35, a protective film 33 arranged on one side of the copper foil 35, and an adhesive film 34 arranged on the other side of the copper foil 35. A release film 36 is also attached to the side of the adhesive film 34 facing away from the copper foil 35. Among them, the copper foil 35 mainly plays a role in heat conduction and dissipation; the protective film 33 is used to protect the copper foil 35 to prevent the copper foil 35 from being exposed and corroded; the adhesive film 34 is used to bond and fit the heat dissipation layer 3 and the display screen 4; the release film 36 is used to protect the adhesive film 34 to prevent its adhesiveness from failing. When the heat dissipation layer 3 is attached to the display screen 4, the release film 36 is then peeled off.

[0063] When the heat dissipation layer 3 is curved and attached in the four-corner area, since the planar area of the film layer in the four-corner position area of the heat dissipation layer 3 is larger than the curved arc surface area of the four-corner position area of the glass cover plate, the four-corner positions of the heat dissipation layer 3 are in a compressed state. And the heat dissipation layer 3 itself does not have stretchability, and the excess part of the heat dissipation layer 3 generated when being compressed is prone to form wrinkles 5, resulting in air bubbles between the heat dissipation layer 3 and the display screen 4. At the same time, during the attachment process of the heat dissipation layer 3, the attachment process is likely to cause the wrinkles 5 of the heat dissipation layer to squeeze the display screen, and when the squeezing is severe, it is likely to cause defects such as cracks in the display screen 4, seriously affecting the display quality of the display screen 4.

[0064] In view of the above technical problems existing currently, the embodiments of the present disclosure provide a display module, as Figure 3 and Figure 4 shown, including a display panel 1; a cover plate 2 arranged on the light-emitting side 101 of the display panel 1; a heat dissipation layer 3 arranged on the back side 102 of the display panel 1; the back side 102 faces away from the light-emitting side 101; the four peripheral edge areas of the cover plate 2, the display panel 1, and the heat dissipation layer 3 are bent towards the back side 102 of the display panel 1 to form arc surfaces with matching shapes; the display panel 1 further includes a planar part; the four peripheral edge areas of the display panel surround the periphery of the planar part; at least part of the orthographic projection edge line of the display module on the plane where the planar part of the display panel 1 is located is an arc; the heat dissipation layer 3 is provided with a stretchable structure 300 in the arc surface area 103 with an arc edge.

[0065] Among them, the planar part of the display panel 1 refers to the planar area of the display panel 1. At least part of the orthographic projection edge line of the display module on the plane where the planar part of the display panel 1 is located is an arc, that is, the display module has at least one corner with an arc-shaped edge line. In this embodiment, as Figure 3As shown, the orthographic projection of the display module on the plane where the flat portion of the display panel 1 is located is a rounded rectangle shape with four rounded corners (the edge lines of the corners are arc lines). In some embodiments, as Figure 5 and Figure 6 shown, the orthographic projection of the display module on the plane where the flat portion of the display panel 1 is located may also be other irregular shapes such as a circle or an ellipse. For Figure 5 and Figure 6 the display module in which the entire orthographic projection edge line is an arc line, the telescopic structure 300 is disposed in the entire edge region of the heat dissipation layer 3.

[0066] By disposing the telescopic structure 300 in the arc surface region 103 of the heat dissipation layer 3 having an arc edge, during the process of disposing the heat dissipation layer 3 in the form of a film layer in the flat state on the back side 102 of the arc surface four edges of the display panel 1, the region of the heat dissipation layer 3 having an arc edge can be well adapted to the arc surface region 103 of the display panel 1 having an arc edge through expansion and contraction, so as to realize that the region of the heat dissipation layer 3 having an arc edge is smoothly bent and deformed from the flat state to an arc surface state adapted to the shape of the arc surface region 103 of the display panel 1 having an arc edge. During this state transformation process, the telescopic structure 300 can well absorb the excess area part generated after the heat dissipation layer 3 is compressed through compression, and can well increase the lacking area part after the heat dissipation layer 3 is stretched through stretching, avoid wrinkles from appearing after the heat dissipation layer 3 is compressed, and at the same time avoid breakage from appearing after the heat dissipation layer 3 is stretched, thereby avoiding the occurrence of bubble defects between the heat dissipation layer 3 and the display panel 1, and at the same time avoiding the occurrence of crack defects on the display panel 1, and improving the quality of the entire display module.

[0067] In some embodiments, as Figures 7 - 9 shown, the heat dissipation layer 3 includes a heat conductive film 31, and the telescopic structure 300 includes through holes 301 opened in the heat conductive film 31. The through holes 301 can well absorb the excess area part generated after the heat dissipation layer 3 is compressed through compression, and can well increase the lacking area part after the heat dissipation layer 3 is stretched through stretching, so as to avoid wrinkles from appearing after the heat conductive film 31 is compressed, and at the same time avoid breakage from appearing after the heat conductive film 31 is stretched, and further ensure good conduction and release of the heat generated by the heat conductive film 31 to the display panel 1.

[0068] In some embodiments, the heat conductive film 31 is made of any one of copper, aluminum, silver, and gold. In some embodiments, the heat conductive film 31 may also be made of other heat conductive materials. In this embodiment, the heat conductive film 31 is made of copper. Copper has good heat conduction and heat release performance, and the copper foil also has good ductility performance, which is beneficial to the flexible setting of the heat dissipation layer 3.

[0069] In some embodiments, the number of the through holes 301 is multiple, and the multiple through holes 301 are arranged in an array along the extending direction L of the arc-shaped edge. That is, the through holes 301 are arranged in multiple rows along the extending direction L of the arc-shaped edge of the display module. Such a setting is beneficial to the stretching and compression of the through holes 301 along the extending direction L of the arc-shaped edge of the display module, so as to avoid wrinkles or fractures of the heat-conducting film 31 along the extending direction L of the arc-shaped edge of the display module during the process of setting the heat-conducting film 31 on the back side of the display panel.

[0070] In some embodiments, the shape of the orthographic projection of the through hole 301 on the display panel 1 includes any one or more of a circle, an ellipse, a rectangle, a rhombus, and a regular polygon. Of course, the shape of the orthographic projection of the through hole 301 on the display panel 1 is not limited to the above shapes and can be any shape. In this embodiment, the shape of the orthographic projection of the through hole 301 on the display panel 1 is a circle.

[0071] In some embodiments, as Figure 9 shown, within the arc-shaped region 103 having an arc-shaped edge, the through holes 301 are evenly distributed. Among them, within the arc-shaped region 103 having an arc-shaped edge, the shapes and opening areas of the through holes 301 are the same.

[0072] In some embodiments, as Figure 10 shown, within the arc-shaped region 103 having an arc-shaped edge, the opening areas of the through holes 301 are the same, and the spacing between the through holes 301 close to the center P of the heat dissipation layer 3 is greater than the spacing between the through holes 301 far from the center P of the heat dissipation layer 3. For example, within the arc-shaped region 103 having an arc-shaped edge, along the direction away from the center P of the heat dissipation layer 3, there are three rows of through holes 301. The spacing s1 between the through holes 301 in the first row is equal, the spacing s2 between the through holes 301 in the second row is equal, and the spacing s3 between the through holes 301 in the third row is equal. The spacing s1 between the through holes 301 in the first row is greater than the spacing s2 between the through holes 301 in the second row, and the spacing s2 between the through holes 301 in the second row is greater than the spacing s3 between the through holes 301 in the third row. During the process of setting the heat dissipation layer 3 on the back side 102 of the display panel 1, since within the arc-shaped region 103 having an arc-shaped edge, along the direction away from the center P of the heat dissipation layer 3, the through holes 301 in the first row and the second row are subjected to compressive stress, and the through holes 301 in the third row are subjected to tensile stress, and the stress received by the through holes 301 from the first row to the third row gradually increases, so through the above setting of the spacing between the through holes 301, the different stresses received by the through holes 301 in different rows can be effectively released through the setting of the density of the through holes 301, thereby avoiding wrinkles caused by the compression of the heat dissipation layer 3 or fractures caused by the stretching of the heat dissipation layer 3.

[0073] In some embodiments, as Figure 11As shown, within the arc surface region 103 with arc-shaped edges, the spacing of the through-holes 301 is the same. The opening area of the through-holes 301 near the center P of the heat dissipation layer 3 is smaller than that of the through-holes 301 far from the center P of the heat dissipation layer 3. For example, within the arc surface region 103 with arc-shaped edges, along the direction away from the center P of the heat dissipation layer 3, three rows of through-holes 301 are arranged. The opening areas m1 of the first row of through-holes 301 are equal, the opening areas m2 of the second row of through-holes 301 are equal, and the opening areas m3 of the third row of through-holes 301 are equal. The opening area m1 of the first row of through-holes 301 is smaller than the opening area m2 of the second row of through-holes 301, and the opening area m2 of the second row of through-holes 301 is smaller than the opening area m3 of the third row of through-holes 301. During the process of setting the heat dissipation layer 3 on the back side 102 of the display panel 1, within the arc surface region 103 with arc-shaped edges, along the direction away from the center P of the heat dissipation layer 3, the first row of through-holes 301 and the second row of through-holes 301 are subjected to compressive stress, and the third row of through-holes 301 is subjected to tensile stress. The stress on the first row of through-holes 301 to the third row of through-holes 301 gradually increases. Therefore, through the above setting of the opening areas of the through-holes 301, different magnitudes of stress on different rows of through-holes 301 can be effectively released through the setting of the density of the through-holes 301, thus avoiding the heat dissipation layer 3 from being compressed to form wrinkles or being stretched to break.

[0074] In some embodiments, the opening size range of the through-holes 301 is 0.5 - 1.5 mm. Among them, for the circular opening of the through-hole 301, the opening size of the through-hole 301 is the diameter of the circle; for the opening of the through-hole 301 with other shapes, the opening size of the through-hole 301 is the minimum radial size of the opening. This opening size range of the through-holes 301 can be achieved by traditional manufacturing processes.

[0075] In some embodiments, as Figure 8 shown, the heat dissipation layer 3 further includes an electromagnetic shielding film 32. The electromagnetic shielding film 32 is disposed on the side of the heat conduction film 31 facing away from the display panel 1, and the electromagnetic shielding film 32 at least covers the through-holes 301 on the heat conduction film 31. Among them, since the heat conduction film 31 is made of a metal heat conduction material with certain extensibility, the heat conduction film 31 can play a certain electromagnetic shielding role to protect the display panel 1 from external electromagnetic interference; however, through-holes 301 are provided in the heat conduction film 31. At the through-holes 301, since the heat conduction film 31 penetrates through the entire thickness of the heat conduction film 31, the heat conduction film 31 cannot play an electromagnetic shielding role at the through-holes 301, and external electromagnetic waves are likely to interfere with the display panel 1 through the through-holes 301. By covering at least the electromagnetic shielding film 32 at the through-holes 301, it is possible to prevent external electromagnetic waves from interfering with the display panel 1 through the through-holes 301, thereby ensuring the normal display of the display panel 1.

[0076] In this embodiment, the electromagnetic shielding film 32 covers the entire heat-conducting film 31. With this arrangement, on the one hand, the preparation process of the electromagnetic shielding film 32 is simplified. On the other hand, compared with the scheme where the electromagnetic shielding film 32 only covers the through hole 301, when the electromagnetic shielding film 32 is disposed on one side of the heat-conducting film 31, no step is formed on one side of the heat-conducting film 31, thus ensuring that the surface of the heat dissipation layer 3 remains flat after the electromagnetic shielding film 32 is provided.

[0077] In some embodiments, the electromagnetic shielding film 32 is made of any one of copper, aluminum, silver, and gold. In some embodiments, the thickness range of the electromagnetic shielding film 32 is 15 - 30 μm. The electromagnetic shielding film 32 with the above materials and thickness has certain stretchable properties, and it can stretch and contract with the heat-conducting film 31, so that the entire heat dissipation layer 3 is not prone to wrinkles or fractures during the process of being disposed on the back side 102 of the display panel 1. It should be noted that the electromagnetic shielding film 32 can also be made of other materials that can play an electromagnetic shielding role and have certain stretchable properties.

[0078] In some embodiments, as Figure 8 shown, the heat dissipation layer 3 further includes a protective film 33. The protective film 33 is disposed on the side of the electromagnetic shielding film 32 away from the display panel 1, and the orthographic projection of the protective film 33 on the display panel 1 coincides with the orthographic projection of the electromagnetic shielding film 32 on the display panel 1. The protective film 33 can protect the electromagnetic shielding film 32 and prevent the electromagnetic shielding film 32 from being corroded and damaged when exposed.

[0079] In some embodiments, the protective film 33 is made of polyolefin material. The protective film 33 made of polyolefin material has certain stretchable properties and can stretch and contract correspondingly with the heat-conducting film 31 and the electromagnetic shielding film 32, so that the entire heat dissipation layer 3 is not prone to wrinkles or fractures during the process of being disposed on the back side 102 of the display panel 1. Of course, the protective film 33 can also be made of other materials with certain stretchable properties.

[0080] In some embodiments, as Figure 12 shown, for the arc surface area 103 of the protective film 33 having an arc edge, from one end far away from the arc edge towards the direction L1 approaching the arc edge, the thickness of the arc surface area gradually thins. With this arrangement, the stretchable properties of the arc surface area 103 of the protective film 33 having an arc edge can be further improved, enabling the arc surface area 103 of the protective film 33 to stretch and contract correspondingly with the heat-conducting film 31 and the electromagnetic shielding film 32, so that the entire heat dissipation layer 3 is not prone to wrinkles or fractures during the process of being disposed on the back side of the display panel.

[0081] In some embodiments, as Figure 13As shown, the thickness of the arc surface area 103 with an arc edge of the protective film 33 is less than that of other parts of the protective film 33. That is, the arc surface area 103 with an arc edge of the protective film 33 has the same thickness and a smaller thickness, and the parts of the protective film 33 other than the arc surface area 103 with an arc edge have the same thickness and a larger thickness. With such a setting, the stretchability of the arc surface area 103 part of the protective film 33 with an arc edge is better than that of other parts of the protective film 33, so that the arc surface area 103 part of the protective film 33 with an arc edge can stretch better with the stretching of the heat conducting film 31 and the electromagnetic shielding film 32, and further, it is not easy to have wrinkles or fractures during the process of setting the entire heat dissipation layer 3 on the back side of the display panel.

[0082] In some embodiments, as Figure 8 shown, the heat dissipation layer 3 further includes an adhesive film 34. The adhesive film 34 is disposed on the side of the heat conducting film 31 close to the display panel 1, and the orthographic projection of the adhesive film 34 on the display panel 1 coincides with the orthographic projection of the electromagnetic shielding film 32 on the display panel 1. The setting of the adhesive film 34, on the one hand, can make the heat dissipation layer 3 firmly adhere to the back side 102 of the display panel 1, thus simplifying the setting process of the heat dissipation layer 3 on the back side 102 of the display panel 1; on the other hand, the setting of the adhesive film 34 can also play a certain buffering role for the acting force during the pasting when the heat dissipation layer 3 is pasted on the back side 102 of the display panel 1, preventing the acting force of pasting the heat dissipation layer 3 from damaging the display panel 1.

[0083] In some embodiments, the adhesive film 34 is made of a stretchable adhesive material. For example, the adhesive film 34 is made of an adhesive material composed of a mixture of foam rubber and soft silicone (or latex, or silica gel). The adhesive film 34 made of the above materials has a certain stretchability and can stretch correspondingly with the stretching of the heat conducting film 31 and the electromagnetic shielding film 32, so that it is not easy to have wrinkles or fractures during the process of setting the entire heat dissipation layer 3 on the back side 102 of the display panel 1. Of course, the adhesive film 34 can also be made of other adhesive materials with a certain stretchability.

[0084] In some embodiments, as Figure 14 shown, in the direction L1 from the end far away from the arc edge to the arc edge of the arc surface area 103 part of the adhesive film 34, the thickness of the arc surface area part gradually thins. With such a setting, the stretchability of the arc surface area 103 part of the adhesive film 34 with an arc edge can be further improved, so that the arc surface area 103 of the adhesive film 34 can stretch correspondingly with the stretching of the heat conducting film 31 and the electromagnetic shielding film 32, so that it is not easy to have wrinkles or fractures during the process of setting the entire heat dissipation layer 3 on the back side of the display panel.

[0085] In some embodiments, as Figure 15As shown, the thickness of the arc surface region 103 of the bonding film 34 with an arc-shaped edge is less than that of other parts of the bonding film 34. That is, the arc surface region 103 of the bonding film 34 with an arc-shaped edge has the same thickness and a smaller thickness, and the parts of the bonding film 34 other than the arc surface region 103 with an arc-shaped edge have the same thickness and a larger thickness. With such a setting, the stretchability of the arc surface region 103 of the bonding film 34 is better than that of other parts of the bonding film 34, so that the arc surface region 103 of the bonding film 34 can stretch better with the stretching of the heat-conducting film 31 and the electromagnetic shielding film 32, and thus it is not easy to appear wrinkles or fractures during the process of setting the entire heat dissipation layer 3 on the back side of the display panel.

[0086] In some embodiments, as Figure 16 shown, the display panel 1 includes a flexible substrate 11, a pixel circuit layer 12 and a light-emitting element 13 provided on the flexible substrate 11. Among them, the pixel circuit layer 12 includes a pixel circuit and an insulating film layer provided between different electrode layers in the pixel circuit. The pixel circuit can adopt driving circuits such as 7T1C or 5T1C. The light-emitting element 13 includes an organic electroluminescent element, a light-emitting diode or a micro light-emitting diode, etc. The display panel 1 can be flexibly bent to adapt to the overall configuration shape of the cover plate 2.

[0087] In some embodiments, not only can the flat display area on the display side 101 of the display panel 1 display an image, but also the arc surface region 103 of the display panel 1 with an arc-shaped edge and the arc surface part formed by bending the four peripheral regions toward its back side 102 can display an image, so that borderless display of the display module can be achieved.

[0088] In some embodiments, it is also possible that only the flat display area on the display side 101 of the display panel 1 can display an image, while the arc surface region 103 of the display panel 1 with an arc-shaped edge and the arc surface part formed by bending the four peripheral regions toward its back side 102 are not used for displaying an image, so that narrow border display of the display module can be achieved.

[0089] In some embodiments, the display panel 1 further includes a packaging layer 14 and a touch electrode layer 15. The packaging layer 14 is provided on the side of the pixel circuit layer 12 and the light-emitting element 13 facing away from the flexible substrate 11, and the orthographic projection of the packaging layer 14 on the flexible substrate 11 covers the entire pixel circuit layer 12 and the light-emitting element 13; thus, the pixel circuit layer 12 and the light-emitting element 13 on the flexible substrate 11 are encapsulated to protect the light-emitting element 13 and the pixel circuit layer 12 from being damaged by the intrusion of external moisture and oxygen. The packaging layer 14 is formed by alternately stacking a plurality of organic film layers and a plurality of inorganic film layers.

[0090] The display panel 1 further includes a touch electrode layer 15, which is disposed on the side of the encapsulation layer 14 close to the light-emitting element 13, and an insulating layer is provided between the touch electrode layer 15 and the conductive electrode layer in the pixel circuit layer 12, so that the touch electrode layer 15 and the conductive electrode layer in the pixel circuit layer 12 are insulated from each other. That is, the display panel 1 adopts the FMLOC (Flexible Multi-Layer On Cell) process to design the touch structure. The FMLOC process means that a metal mesh touch electrode layer 15 is fabricated on the encapsulation structure of the display panel 1, so as to perform touch control on the display panel 1 without an external touch panel. The FMLOC process can reduce the thickness of the touch display panel 1, which is beneficial to the bending and folding of the display panel 1; at the same time, it avoids the fitting tolerance between the touch structure and the display panel 1, and can reduce the frame width of the display panel 1.

[0091] In some embodiments, the touch electrode layer may also be disposed on the side of the encapsulation layer facing away from the light-emitting element. That is, the display panel adopts an external touch panel.

[0092] In some embodiments, the display panel 1 further includes a polarizer 16, which is disposed on the side of the encapsulation layer 14 facing away from the touch electrode layer 15. The polarizer 16 is a circular polarizer. The polarizer 16 can not only eliminate the reflection of external light by each conductive metal film layer in the pixel circuit layer 12, but also eliminate the reflection of external light by the touch electrode layer 15. The principle of the polarizer 16 to eliminate reflection is as follows: the incident external light passes through the circular polarizer and becomes circularly polarized light. After the circularly polarized light is reflected by the metal electrode, the rotation direction thereof changes. When the reflected light passes through the circular polarizer again, it cannot exit from the circular polarizer, thereby eliminating the reflected light; at the same time, it also improves the contrast of the display panel 1 in a bright environment.

[0093] In some embodiments, as Figure 4 shown, the display panel 1 and the cover plate 2 are fixed to each other by providing an OCA optical adhesive 6. The OCA optical adhesive 6 has the characteristics of being colorless and transparent, having a light transmittance of more than 90%, good bonding strength, being curable at room temperature or medium temperature, having a small curing shrinkage, etc., and also having high weather resistance, water resistance, high temperature resistance, ultraviolet resistance, easy thickness control, providing a uniform spacing, and not yellowing (yellowing), peeling or deteriorating after long-term use.

[0094] Based on the above structure of the display module, the embodiments of the present disclosure further provide a method for manufacturing the display module, including: preparing a cover plate; bending the four peripheral edge regions of the cover plate toward one side of the cover plate surface to form an arc surface.

[0095] Preparing a display panel.

[0096] Preparing a heat dissipation layer.

[0097] The display panel is disposed inside the cover plate, and the display panel is adapted to the shape of the cover plate. The inner side of the cover plate is the inner side of the arc-shaped opening; and the cover plate is located on the light-emitting side of the display panel. The display panel includes a flat portion and a four-sided edge region surrounding the periphery of the flat portion.

[0098] The heat dissipation layer is disposed on the back side of the display panel, and the heat dissipation layer is adapted to the shape of the display panel. The back side of the display panel faces away from its light-emitting side.

[0099] At least part of the orthographic projection edge line of the display module on the plane where the flat portion of the display panel is located is an arc; preparing the heat dissipation layer includes preparing a retractable structure in the arc-shaped region of the heat dissipation layer having an arc edge.

[0100] In some embodiments, the cover plate can be a glass cover plate. Of course, the cover plate can also be a cover plate of other materials. A sticking fixture is used to stick the flexible display panel to the inside of the cover plate. After the display panel is stuck to the inside of the cover plate, the shape of the display panel is adapted to the shape of the cover plate. The cover plate completely covers the light-emitting side of the display panel to protect the light-emitting side of the display panel, and at the same time can ensure that the display light of the display panel can normally pass through the cover plate and be emitted, realizing the normal display of the display panel.

[0101] In some embodiments, a sticking fixture is used to stick the heat dissipation layer to the back side of the display panel. In the arc-shaped region of the heat dissipation layer having an arc edge, by appropriately compressing the part of the retractable structure in this arc-shaped region close to the center of the heat dissipation layer and appropriately stretching the part of the retractable structure in this arc-shaped region away from the center of the heat dissipation layer during the sticking process, the arc-shaped region of the heat dissipation layer having an arc edge can be made to be adapted to the shape of the arc-shaped region of the display panel having an arc edge and closely fit. There will be no wrinkles in the arc-shaped region of the heat dissipation layer, and there will be no defects such as sticking bubbles between the heat dissipation layer and the display panel. The specific sticking process is a traditional process and will not be elaborated here.

[0102] In some embodiments, preparing the heat dissipation layer includes preparing a heat-conducting film; preparing the retractable structure includes opening through holes in the heat-conducting film by using an etching process or a punching process.

[0103] Among them, the etching process includes coating a photoresist on the prepared heat-conducting film, and then forming the pattern of the through hole by means of exposure, development, and wet etching. This etching process is a traditional process and will not be elaborated specifically. The punching process is to punch the heat-conducting film in the through-hole region according to the punching pattern to remove the heat-conducting film in the through-hole region, thereby forming a through hole. Of course, in the punching process, a mask plate can also be used to define the pattern of the through hole, and then a punching device is used to punch and remove the through-hole pattern defined by the mask plate to form the pattern of the through hole. The punching process is also a relatively mature traditional process and will not be elaborated here.

[0104] In the display module provided in the embodiments of the present disclosure, by providing a telescopic structure in the arc-shaped surface area of the heat dissipation layer with an arc-shaped edge, during the process of setting the heat dissipation layer in the form of a flat film layer on the back side of the arc-shaped edge of the display panel, the area of the heat dissipation layer with an arc-shaped edge can be well adapted to the arc-shaped surface area of the display panel with an arc-shaped edge through telescoping. Thus, the area of the heat dissipation layer with an arc-shaped edge can be smoothly bent and deformed from a flat state to an arc-shaped state adapted to the shape of the arc-shaped surface area of the display panel with an arc-shaped edge. During this state transformation process, the telescopic structure can well absorb the excess area generated after the heat dissipation layer is compressed through compression, and can well increase the lacking area after the heat dissipation layer is stretched through stretching, avoiding wrinkles from appearing after the heat dissipation layer is compressed, and at the same time avoiding fractures from appearing after the heat dissipation layer is stretched, thereby avoiding bubble defects between the heat dissipation layer and the display panel, and at the same time also avoiding crack defects on the display panel, improving the quality of the entire display module.

[0105] The embodiments of the present disclosure further provide a display device, including the display module in the above embodiments.

[0106] By adopting the display module in the above embodiments, the manufacturing quality and display quality of the display device are improved.

[0107] The display panel provided in the embodiments of the present disclosure can be any product or component with a display function, such as an OLED panel, an OLED TV, an LED panel, an LED TV, a Mini LED panel, a Mini LED TV, a monitor, a mobile phone, a navigator, etc.

[0108] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.

Claims

1. A display module, characterized in that, it includes a display panel; the display panel includes a flexible substrate, a pixel circuit layer and a light-emitting element stacked in sequence on one side of the flexible substrate; a cover plate disposed on the light-emitting side of the display panel; a heat dissipation layer disposed on the back side of the display panel; the back side faces away from the light-emitting side; the four peripheral edge regions of the cover plate, the display panel and the heat dissipation layer are bent towards the back side of the display panel to form arc surfaces with matching shapes; the display panel further includes a flat portion; the four peripheral edge regions of the display panel surround the periphery of the flat portion; at least part of the orthographic projection edge line of the display module on the plane where the flat portion of the display panel is located is an arc; the heat dissipation layer is provided with a telescopic structure in the arc surface region having an arc edge; the heat dissipation layer includes a heat conduction film, and the telescopic structure includes through holes opened in the heat conduction film; the number of the through holes is multiple, and the multiple through holes are arranged in an array along the extending direction of the arc edge; within the arc surface region having the arc edge, the opening areas of the through holes are the same, and the distance between the through holes close to the center of the heat dissipation layer is greater than the distance between the through holes far from the center of the heat dissipation layer.

2. The display module according to claim 1, characterized in that, within the arc surface region having the arc edge, the distances between the through holes are the same, and the opening area of the through hole close to the center of the heat dissipation layer is smaller than the opening area of the through hole far from the center of the heat dissipation layer.

3. The display module according to any one of claims 1-2, characterized in that, the opening size range of the through holes is 0.5-1.5 mm.

4. The display module according to claim 3, characterized in that, the orthographic projection shape of the through holes on the display panel includes any one or more of a circle, an ellipse, a rectangle, a rhombus, and a regular polygon.

5. The display module according to claim 1, characterized in that, the heat conduction film is made of any one of copper, aluminum, silver, and gold.

6. The display module according to any one of claims 1-2, characterized in that, the heat dissipation layer further includes an electromagnetic shielding film, the electromagnetic shielding film is disposed on the side of the heat conduction film facing away from the display panel, and the electromagnetic shielding film at least covers the through holes on the heat conduction film.

7. The display module according to claim 6, characterized in that, the electromagnetic shielding film is made of any one of copper, aluminum, silver, and gold.

8. The display module according to claim 6, characterized in that, the heat dissipation layer further includes a protective film, the protective film is disposed on the side of the electromagnetic shielding film facing away from the display panel, and the orthographic projection of the protective film on the display panel coincides with the orthographic projection of the electromagnetic shielding film on the display panel.

9. The display module according to claim 8, characterized in that, in the arc surface region of the protective film having the arc edge, from one end far from the arc edge to the direction close to the arc edge, the thickness of the arc surface region part gradually thins.

10. The display module according to claim 8, wherein, the thickness of the arc surface area part of the protective film having the arc edge is less than the thickness of other parts of the protective film.

11. The display module according to claim 8, wherein, the protective film is made of polyolefin material.

12. The display module according to claim 8, wherein, the heat dissipation layer further includes an adhesive film, the adhesive film is disposed on a side of the heat conductive film close to the display panel, and the orthographic projection of the adhesive film on the display panel coincides with the orthographic projection of the electromagnetic shielding film on the display panel.

13. The display module according to claim 12, wherein, in a direction from one end far from the arc edge to the arc edge of the arc surface area part of the adhesive film having the arc edge, the thickness of the arc surface area part gradually thins.

14. The display module according to claim 12, wherein, the thickness of the arc surface area part of the adhesive film having the arc edge is less than the thickness of other parts of the adhesive film.

15. The display module according to claim 12, wherein, the adhesive film is made of a stretchable adhesive material.

16. A display device, wherein, it includes the display module according to any one of claims 1-15.

17. A method for manufacturing a display module, wherein, it includes: preparing a cover plate; the four peripheral edge regions of the cover plate are bent towards one side of the cover plate surface to form an arc surface; preparing a display panel; preparing a heat dissipation layer; disposing the display panel inside the cover plate, and the display panel is adapted to the shape of the cover plate; the inner side of the cover plate is the inner side of the arc surface opening; and the cover plate is located on the light-emitting side of the display panel; the display panel includes a flat part and four peripheral edge regions surrounding the periphery of the flat part; disposing the heat dissipation layer on the back side of the display panel, and the heat dissipation layer is adapted to the shape of the display panel; the back side of the display panel faces away from its light-emitting side; at least part of the orthographic projection edge line of the display module on the plane where the flat part of the display panel is located is an arc; the step of preparing the heat dissipation layer includes preparing a stretchable structure in the arc surface area of the heat dissipation layer having an arc edge; the step of preparing the heat dissipation layer includes preparing a heat conductive film; the step of preparing the stretchable structure includes opening through holes in the heat conductive film by using an etching process or a punching process.

Images