Backlight module and display device

Abstract

The present disclosure provides a backlight module and a display device comprising the same. The backlight module comprises: a metal back plate comprising a support portion and a bent portion, the support portion being located in a first plane, the bent portion being at an angle with the first plane and surrounding a first opening; a first prism sheet arranged above the support portion of the metal back plate and comprising a second opening, the first prism sheet comprising an anti-hole light structure; a first light shielding layer arranged on a side of the first prism sheet away from the support portion; wherein the first prism sheet comprises a plurality of prism structures, each prism structure extending along a first direction, an angle between a line connecting a point on an edge of the second opening and a center of the second opening and a second direction being β, the anti-hole light structure being located on the edge of the second opening, a projection of the anti-hole light structure in the first plane covering at least a projection of the edge of the second opening in the first plane within an angle range of β.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a backlight module and a display device including the backlight module. Background Technology

[0002] With the development of full-screen displays, punch-hole displays have become a mainstream trend. Display products using punch-hole displays suffer from poor light efficiency around the hole due to size limitations (the distance between the metal backplate at the hole and the display area is restricted). Poor light efficiency around the hole includes aperture backlighting, under-hole brightness, and bright lines around the hole. Aperture backlighting refers to a beam of light emanating from the hole at wide viewing angles. In related technologies, plating the metal backplate of the optical module with black nickel can absorb the poor light and solve the aperture backlighting problem; however, this solution is costly and not optimal. More feasible solutions (improving quality or reducing cost) need to be explored. Utility Model Content

[0003] According to one aspect of this disclosure, a backlight module is provided. The backlight module includes: a metal backplate including a support portion and a bending portion, the support portion being located in a first plane, the bending portion forming an angle with the first plane and surrounding it to form a first opening; a first prism sheet disposed above the support portion of the metal backplate and including a second opening, the first prism sheet including an anti-aperture light-emitting structure; and a first light-shielding layer disposed on the side of the first prism sheet opposite to the support portion; wherein the orthographic projection of the first opening in the first plane is located inside the orthographic projection of the second opening in the first plane, the orthographic projection of the first light-shielding layer in the first plane covers the orthographic projection of the bending portion in the first plane, and the first light-shielding layer... The orthographic projection in the first plane at least partially overlaps with the orthographic projection of the first prism sheet in the first plane, wherein the first prism sheet includes a plurality of prism structures, each prism structure extending along a first direction, the line connecting a point on the edge of the second opening and the center of the second opening makes an angle β with the second direction, the anti-aperture light-emitting structure is located at the edge of the second opening, the orthographic projection of the anti-aperture light-emitting structure in the first plane at least covers the orthographic projection of the edge of the second opening in the first plane where the angle β is within 15°, the first direction and the second direction are both in the plane where the first prism sheet is located, and the first direction is perpendicular to the second direction.

[0004] In some embodiments, the first prism sheet includes a main body and a protrusion, the anti-aperture light-emitting structure includes the protrusion, the distance H1 between the sidewall of the protrusion facing the second opening and the bent portion of the metal back plate is less than the distance H2 between the sidewall of the main body facing the second opening and the bent portion of the metal back plate, and the angle between the line connecting one end of the protrusion and the center of the second opening and the second direction is in the range of 15°-30°.

[0005] In some embodiments, the distance H1 between the sidewall of the protrusion facing the second opening and the bent portion of the metal back plate is ≥0.12mm.

[0006] In some embodiments, the difference between the distance H2 between the sidewall of the main body facing the second opening and the bent portion of the metal back plate and the distance H1 between the sidewall of the protrusion facing the second opening and the bent portion of the metal back plate is d, where 0 mm < d ≤ (0.03 + H2 - 0.15) mm.

[0007] In some embodiments, the anti-aperture light-emitting structure includes a roughened sidewall of the first prism facing the second opening.

[0008] In some embodiments, the roughened sidewall of the first prism sheet facing the second opening includes a roughened surface formed by processing the material of the first prism sheet itself.

[0009] In some embodiments, the roughened sidewall of the first prism facing the second opening includes a roughened material layer disposed on the sidewall of the first prism facing the second opening.

[0010] In some embodiments, the orthographic projection of the anti-aperture light-emitting structure in the first plane covers the orthographic projection of the edge of the second opening in the first plane.

[0011] In some embodiments, the anti-aperture light-emitting structure includes a planarization structure of the first prism sheet near the second opening, the planarization structure being disposed on one side surface of the first prism sheet having a plurality of prism structures.

[0012] In some embodiments, each prism structure has a triangular cross-section in a plane perpendicular to the first direction, and the planarization structure has a cross-section including at least one trapezoidal shape.

[0013] In some embodiments, the planarization structure includes a smooth plane parallel to the first plane.

[0014] In some embodiments, the width of the planarization structure is 0.1-0.15 mm.

[0015] In some embodiments, the orthographic projection of the anti-aperture light-emitting structure in the first plane covers the orthographic projection of the edge of the second opening in the first plane.

[0016] In some embodiments, the backlight module further includes a second light-shielding layer disposed on the side of the first prism sheet facing the support portion; wherein the orthographic projection of the second light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the first prism sheet in the first plane, and the orthographic projection of the second light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the second opening in the first plane.

[0017] In some embodiments, the orthographic projection of the second light-shielding layer in the first plane is inside the orthographic projection of the first light-shielding layer in the first plane, and the distance B between the orthographic projection of the sidewall of the second light-shielding layer away from the bend and the sidewall of the first light-shielding layer away from the bend in the first plane is ≥0.05mm.

[0018] In some embodiments, the material of the first light-shielding layer is light-shielding adhesive, and the material of the second light-shielding layer is light-shielding adhesive or black PET.

[0019] In some embodiments, the angle between the bent portion and the first plane is 90°±1°.

[0020] According to another aspect of this disclosure, a backlight module is provided. The backlight module includes: a metal backplate including a support portion and a bending portion, the support portion being located in a first plane, the bending portion forming an angle with the first plane and surrounding it to form a first opening; a first prism sheet disposed above the support portion of the metal backplate and including a second opening; a second prism sheet disposed on the side of the first prism sheet facing the support portion; and a third light-shielding layer disposed between the first prism sheet and the second prism sheet; wherein the orthographic projection of the third light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the first prism sheet in the first plane, and the orthographic projection of the third light-shielding layer in the first plane covers the orthographic projection of the bending portion in the first plane.

[0021] According to another aspect of this disclosure, a display device is provided. The display device includes a display panel and a backlight module as described in any of the foregoing embodiments, the display panel including a functional hole, the center of which is aligned with the center of a first opening. Attached Figure Description

[0022] To more clearly describe the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1A A photograph of light emitted from a display device aperture in related technologies;

[0024] Figure 1B This is a cross-sectional schematic diagram of a display device in related technologies;

[0025] Figure 1C This is a cross-sectional schematic diagram of the backlight module of a display device in related technologies;

[0026] Figure 1D This is a schematic diagram of the optical path of light emitted through the aperture of a backlight module in related technologies;

[0027] Figure 1E This is a schematic diagram of the optical path in the prism of a backlight module in a related technology.

[0028] Figure 1F This is a diagram simulating the effect of light entering through the side wall of the first prism using the Light Tools software.

[0029] Figure 1G(a)-Figure 1G(d) This refers to light rays emanating from directions at different angles to the direction of the first prism, simulated using the light tools software.

[0030] Figure 2A This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure;

[0031] Figure 2B This is a top view of the first prism sheet of the backlight module according to an embodiment of the present disclosure;

[0032] Figure 3 This is a top view of the first prism sheet in the backlight module according to an embodiment of the present disclosure;

[0033] Figure 4 This is a partial top view of a backlight module according to an embodiment of the present disclosure;

[0034] Figure 5A This is a diagram simulating the light effect when the first prism sheet overlaps with the first light-shielding layer by 0.22mm using the Light Tools software.

[0035] Figure 5B This is a diagram simulating the light effect when the first prism sheet overlaps with the first light-shielding layer by 0.25mm using the Light Tools software.

[0036] Figure 6 A top view of a portion of a backlight module according to an embodiment of the present disclosure;

[0037] Figure 7 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure;

[0038] Figure 8 for Figure 7 A partial top view of a backlight module according to an embodiment of the present disclosure is shown;

[0039] Figure 9 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure;

[0040] Figure 10 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure;

[0041] Figure 11A An enlarged view of the smooth sidewall of a first prism sheet conventionally processed in related technologies;

[0042] Figure 11B To simulate using the Light Tools software Figure 11A The image shows the lighting effect of the backlight module of the first prism sheet.

[0043] Figure 12A This is an enlarged view of the rough sidewall of a first prism sheet punched with a sandblasting cutter head according to an embodiment of the present disclosure;

[0044] Figure 12B This is an enlarged view of the rough sidewall of a first prism sheet employing laser charring according to an embodiment of the present disclosure;

[0045] Figure 13 A diagram simulating the light effect of a backlight module with a first prism sheet featuring roughened sidewalls, created using the Light Tools software.

[0046] Figure 14 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure;

[0047] Figure 15 This is a schematic diagram of the manufacturing method of the first prism sheet in the related technology;

[0048] Figure 16 for Figure 14 A schematic diagram of a method for manufacturing a first prism sheet in a backlight module according to an embodiment of the present disclosure;

[0049] Figure 17 This is a cross-sectional schematic diagram of a display device according to an embodiment of the present disclosure;

[0050] Figure 18This is a photograph of the camera hole of a display device according to an embodiment of the present disclosure.

[0051] It should be understood that the accompanying drawings are merely schematic illustrations of exemplary embodiments of the present disclosure and are not intended to limit the scope of the disclosure, and need not be drawn strictly to scale. Furthermore, in the drawings, the same or similar reference numerals are used to refer to the same or similar parts. Detailed Implementation

[0052] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0053] With the development of full-screen displays, punch-hole displays have become one of the mainstream trends. In display devices using punch-hole displays, a beam of light in the shape of a sword can be seen emanating from the hole under wide viewing angles; this phenomenon is referred to in the art as aperture beam emission. Figure 1A This is a photograph of aperture light emission from a display device in a related technology. In this technology, black nickel is plated on the metal backplate of the backlight module. The black metal backplate absorbs poor light, which can solve the aperture light emission problem. However, this solution is costly and not the optimal solution. It is necessary to explore more feasible solutions (to improve quality or reduce costs).

[0054] Figure 1B This is a cross-sectional schematic diagram of a display device in related technologies. For example... Figure 1B As shown, the display device includes a backlight module 10 and a display panel 20. The backlight module 10 includes: a metal backplate 11, a reflective sheet 17, a light guide plate 16, a diffuser 15, a second prism sheet 14, a first prism sheet 12, and a light-shielding layer 13, sequentially arranged on the metal backplate 11. The display panel 20 includes: a lower polarizer 21, an array substrate 22, a black matrix 23, a color filter substrate 24, an upper polarizer 25, an optically transparent adhesive 26, and a glass cover plate 27. The backlight module 10 and the display panel 20 are bonded together by a first adhesive 31 and a second adhesive 32. Figure 1B The portion between the two dashed lines corresponds to the position of the hole in this disclosure, and the portion outside the two dashed lines corresponds to the position of the display area in this disclosure.

[0055] Figure 1C This is a cross-sectional schematic diagram of the backlight module of a display device in related technologies. For example... Figure 1CAs shown, the metal backplate 11 includes a support portion 111 and a bending portion 112. The bending portion 112 forms a first opening 110 around the support portion of the metal backplate. A first prism sheet 12 is arranged above the support portion of the metal backplate and includes a second opening 120. In related products, the distance H between the sidewall of the first prism sheet 12 facing the second opening 120 and the bending portion 112 of the metal backplate 11 is generally between 0.15mm and 0.2mm.

[0056] Figure 1D This is a schematic diagram of the optical path of light emitted from the aperture of a backlight module in related technologies. The backlight module has a symmetrical structure. Figure 1D Only a cross-section of one side of the backlight module's axis of symmetry is shown; the straight lines with arrows in the figure indicate the propagation path of light. Figure 1D As shown, some light rays emitted from the light guide plate 16 are incident on the bent portion 112 of the metal back plate 11. After being reflected by the bent portion 112, they pass through the side wall of the first prism sheet 12 and enter the first prism sheet 12. After being refracted by the first prism sheet 12, the light rays that cannot be blocked by the light shielding layer 13 enter the display area, resulting in the above-mentioned aperture light phenomenon.

[0057] Figure 1E This is a schematic diagram of the optical path in the prism of a backlight module in a related technology. For example... Figure 1E As shown, light rays incident on the sidewall of the prism at different angles are refracted in the prism. Some of the light rays can be blocked by the light-blocking adhesive, while some light rays (i.e., the large-angle light rays in the figure) cannot be blocked by the light-blocking adhesive. The large-angle light rays that cannot be blocked by the light-blocking adhesive cause the above-mentioned aperture light phenomenon.

[0058] The researchers who published this information... Figure 1D and Figure 1E The optical path design was verified through software simulation and tested with actual products. Figure 1F This is a diagram simulating the effect of light entering through the side wall of the first prism using the Light Tools software. Figure 1F As shown, light enters through the sidewall of the first prism, and some light that cannot be blocked by the light-shielding layer exits from the display area at a wide angle, causing aperture irradiation. In actual products, even when the lower wall of the first prism corresponding to the aperture is painted black, the aperture irradiation phenomenon still exists; however, when the sidewall of the first prism facing the second opening is painted black, the aperture irradiation phenomenon disappears. Software simulation and product experiments show that the bent portion of the metal backplate reflects light onto the sidewall of the first prism facing the second opening, and the portion of the light that cannot be blocked by the light-shielding layer after refraction in the prism causes aperture irradiation.

[0059] In addition, the researchers of this disclosure also analyzed the intensity of aperture light caused by light incident on the sidewall of the first prism sheet facing the second opening from different directions using software simulation. Figure 1G(a)-Figure 1G(d)Figure 1G(a) shows the aperture lighting simulation produced by light incident from different directions onto the sidewall of the first prism facing the second opening, using the Light Tools software. Figure 1G(b) shows the simulation of light incident at 0° to the direction of the first prism onto the sidewall facing the second opening, with no light escaping from the display area. Figure 1G(c) shows the simulation of light incident at 90° to the direction of the first prism onto the sidewall facing the second opening, with noticeable light escaping from the display area, i.e., aperture lighting. Figure 1G(d) shows the simulation of light incident at 135° to the direction of the first prism onto the sidewall facing the second opening, with no light escaping from the display area. As can be seen, when light is incident on the sidewall of the first prism facing the second opening at angles of 0°, 45°, and 135° to the direction of the first prism, no light escapes from the display area, resulting in no aperture refraction. Only when light is incident on the sidewall of the first prism facing the second opening at an angle of 90° to the direction of the first prism does light escape from the display area, resulting in aperture refraction. Simulation results show that the aperture refraction is most pronounced when light is incident on the sidewall of the first prism facing the second opening in a direction perpendicular to the direction of the first prism.

[0060] It should be noted that a prism sheet typically has multiple prism structures arranged on it, each extending in the same direction. The "direction of the first prism sheet" mentioned above refers to the direction in which each of the multiple prism structures on the first prism sheet extends. For example, in... Figure 2B In the top view of the first prism sheet shown, each diagonal line indicates the top edge of a prism structure, D1 indicates the "direction of the first prism sheet", and D2 indicates the "direction perpendicular to the direction of the first prism sheet".

[0061] Based on the above analysis and verification, the researchers have determined the mechanism of light emission from the display device: light emitted from the light guide plate is reflected by the metal back plate, the reflected light passes through the sidewall of the first prism and enters the first prism. The portion of the light that cannot be blocked by the light-shielding layer after refraction in the first prism exits from the display area, causing aperture light emission. Therefore, to solve the aperture light emission problem, addressing any defective light path at any of the above locations will resolve the issue. If the solution has no reliability risks, achieves stable batch production, and is cost-controllable, it can be considered a mass-producible solution.

[0062] In view of this, the present disclosure proposes the following technical solution to solve the problem of aperture light emission.

[0063] According to a first aspect of this disclosure, a backlight module is provided. Figure 2A This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure. Figure 2B This is a top view of the first prism sheet of a backlight module according to an embodiment of the present disclosure. Figure 2A and Figure 2B As shown, the backlight module includes: a metal backplate 11, which includes a support portion 111 and a bending portion 112. The support portion 111 is located in a first plane, and the bending portion 112 forms an angle with the first plane and surrounds it to form a first opening 110; a first prism sheet 12, which is disposed above the support portion 111 of the metal backplate 11 and includes a second opening 120. The first prism sheet 12 includes an anti-aperture light-emitting structure 12'; and a first light-shielding layer 13, which is disposed on the side of the first prism sheet 12 away from the support portion 111. The orthographic projection of the first opening 110 in the first plane is located inside the orthographic projection of the second opening 120 in the first plane, and the orthographic projection of the first light-shielding layer 13 in the first plane covers the orthographic projection of the bending portion 112 in the first plane. The orthographic projection of the light-shielding layer 13 in the first plane at least partially overlaps with the orthographic projection of the first prism sheet 12 in the first plane, wherein the first prism sheet 12 includes a plurality of prism structures 123, each prism structure 123 extending along a first direction D1, the line connecting a point on the edge of the second opening 120 and the center O of the second opening makes an angle β with the second direction D2, the anti-aperture light-emitting structure 12' is located at the edge of the second opening 120, the orthographic projection of the anti-aperture light-emitting structure 12' in the first plane at least covers the orthographic projection of the edge of the second opening 120 in the first plane where the angle β is within 15°, the first direction D1 and the second direction D2 are both in the plane where the first prism sheet 12 is located, and the first direction D1 is perpendicular to the second direction D2.

[0064] Figure 3 This is a top view of the first prism sheet in a backlight module according to an embodiment of the present disclosure. Figure 4 This is a partial top view of a backlight module according to an embodiment of the present disclosure. Figure 6 This is a top view of a portion of a backlight module according to an embodiment of the present disclosure. In some embodiments, such as... Figure 3 , Figure 4 and Figure 6As shown, the first prism sheet 12 includes a main body 121 and a protrusion 122. The anti-aperture light-emitting structure includes the protrusion 122. The distance H1 between the sidewall of the protrusion 122 facing the second opening 120 and the bent portion 112 of the metal back plate is less than the distance H2 between the sidewall of the main body 121 facing the second opening 120 and the bent portion 112 of the metal back plate. The angle θ between the line connecting one end of the protrusion 122 and the center O of the second opening and the second direction D2 is in the range of 15°-30°.

[0065] By providing a protrusion 122 facing the second opening 120 on the first prism sheet 12, the distance H1 between the side wall of the protrusion 122 facing the second opening 120 and the bent portion 112 of the metal back plate 11 will be smaller than the distance H2 between the side wall of the main body 121 facing the second opening 120 and the bent portion 112 of the metal back plate 11. This increases the overlap area between the protrusion 122 of the first prism sheet 12 and the first light-shielding layer 13, and the light that might otherwise be emitted is blocked by the first light-shielding layer 13, which can effectively reduce aperture light.

[0066] It should be noted that "the center of the second opening" refers to the geometric center of the second opening. For example... Figure 6 The second opening 120 formed by the first prism sheet shown has two arcs on the edge of the main body 121 of the first prism sheet facing the second opening. These two arcs can be located on a circle. The protrusion 122 of the first prism sheet also has two arcs on the edge of the second opening. These two arcs can also be located on a circle. These two circles can be concentric circles. The center O of the two concentric circles is the center of the second opening.

[0067] The Lighttools software simulation also confirmed the above effect. Figure 5A This is a diagram simulating the light effect when the first prism sheet overlaps with the first light-shielding layer by 0.22mm using the LightTools software. Figure 5B This is a diagram simulating the light effect when the first prism sheet overlaps the first light-blocking layer by 0.25mm, as demonstrated by the Light Tools software. Figure 5A and Figure 5B As can be seen, compared with the case where the first prism sheet overlaps with the first light-shielding layer by 0.22mm, the light emitted from the display area is significantly reduced when the first prism sheet overlaps with the first light-shielding layer by 0.25mm. This indicates that increasing the overlap area between the first prism sheet and the first light-shielding layer can effectively reduce aperture light.

[0068] Since the aperture light is most pronounced when light strikes the sidewall of the first prism facing the second opening in a direction perpendicular to the direction of the first prism, the aperture light can be reduced more effectively by providing a protrusion in a direction perpendicular to the direction of the first prism. The angle θ between the line connecting one end of the protrusion and the center of the second opening and the second direction is set in the range of 15°-30°. This locally increases the overlap area between the first prism and the first light-shielding layer, which can effectively reduce aperture light and prevent the risk of wrinkles caused by increasing the overall overlap area between the first prism and the first light-shielding layer.

[0069] In some embodiments, due to manufacturing limitations, the distance between the sidewall of the protrusion of the first prism facing the second opening and the bent portion of the metal back plate cannot be reduced indefinitely. For example... Figure 4 As shown, the distance H1 between the sidewall of the protrusion 122 facing the second opening and the bent portion 112 of the metal back plate is ≥0.12mm, for example, H1 = 0.12mm, H1 = 0.13mm or H1 = 0.14mm.

[0070] In some implementations, such as Figure 4 and Figure 6 As shown, the difference between the distance H2 between the sidewall of the main body 121 facing the second opening 120 and the bent portion 112 of the metal back plate and the distance H1 between the sidewall of the protruding portion 121 facing the second opening and the bent portion 112 of the metal back plate is d. The value of d can be in the range of: 0mm < d ≤ (0.03 + H2 - 0.15)mm. For example, when H2 = 0.15mm, 0mm < d ≤ 0.03; when H2 = 0.17mm, 0mm < d ≤ 0.05; when H2 = 0.2mm, 0mm < d ≤ 0.08.

[0071] Figure 10 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure. In some embodiments, such as Figure 10As shown, the backlight module includes: a metal backplate 11, which includes a support portion 111 and a bending portion 112, the support portion 111 being located in a first plane, the bending portion 112 forming an angle with the first plane and surrounding to form a first opening 110; a first prism sheet 12, which is disposed above the support portion 111 of the metal backplate 11 and includes a second opening 120; a first light-shielding layer 13, which is disposed on the side of the first prism sheet 12 facing away from the support portion 111; wherein, the orthographic projection of the first opening 110 in the first plane is located inside the orthographic projection of the second opening 120 in the first plane, the orthographic projection of the first light-shielding layer 13 in the first plane covers the orthographic projection of the bending portion 112 in the first plane, and the orthographic projection of the first light-shielding layer 13 in the first plane at least partially overlaps with the orthographic projection of the first prism sheet 12 in the first plane; and wherein, the anti-aperture light-emitting structure includes a roughened sidewall 1200 of the first prism sheet 12 facing the second opening 120.

[0072] In some embodiments, the roughened sidewall of the first prism sheet facing the second opening includes a roughened surface formed by processing the material of the first prism sheet itself.

[0073] Figure 11A This is an enlarged view of the smooth sidewall of a first prism sheet, which is conventionally processed in related technologies. Figure 11B To simulate using the Light Tools software Figure 11A The diagram shows the light effect of the backlight module of the first prism. As can be seen, the sidewall of the first prism, which is processed using conventional technology, is smooth. A large amount of light reflected from the bent part of the metal back plate can enter through the sidewall of the first prism, and thus a large amount of light that cannot be effectively blocked by the light-shielding layer will be emitted into the display area, resulting in severe aperture light scattering.

[0074] In this embodiment, the sidewall of the first prism sheet has a roughened surface. In one embodiment, the first prism sheet can be punched with a sandblasted cutting head to change the original smooth sidewall into a broken design, thereby increasing the roughness of the sidewall of the first prism sheet. Figure 12A This is an enlarged view of the rough sidewall of a first prism sheet punched with a sandblasting head according to an embodiment of the present disclosure. In another embodiment, a high-power (e.g., 80W) laser can be used to process the sidewall of the first prism sheet, and the surface of the sidewall of the first prism sheet is charred. The charred size can be up to 0.05mm (e.g., the charred size can be 0.01mm, 0.02mm, 0.03mm, etc.). Laser charring can significantly increase the roughness of the sidewall of the first prism sheet. Figure 12BThis is an enlarged view of the rough sidewall of the first prism sheet using laser charring according to an embodiment of the present disclosure. In another embodiment, the first prism sheet can be stamped using a heated punch, for example, by heating the punch to 200-300°C. When stamping the second opening of the first prism sheet, the heated punch will char the first prism sheet, and the charring size can be 0-0.1 mm, for example, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, etc.

[0075] In some embodiments, the roughened sidewall of the first prism facing the second opening includes a roughened material layer disposed on the sidewall of the first prism facing the second opening.

[0076] In embodiments where the anti-aperture light-emitting structure includes a roughened sidewall of the first prism sheet facing the second opening, the orthographic projection of the anti-aperture light-emitting structure in the first plane can cover the orthographic projection of the edge of the second opening in the first plane; that is, the roughened sidewall can be arranged around the entire edge of the first prism sheet surrounding the second opening. In other embodiments, the roughened sidewall may also be arranged only on a portion of the edge of the first prism sheet surrounding the second opening; for example, the angle between the line connecting one end of the roughened sidewall to the center of the second opening and the second direction is in the range of 15°-30°. Figure 13 This is a simulation of the light effect of a backlight module with a roughened sidewall first prism using LightTools software. It can be seen that when light reflected from the bent portion of the metal backplate strikes the roughened sidewall first prism, it is dispersed, resulting in less light entering the first prism and ultimately only a small amount escaping from the display area, effectively mitigating aperture glare.

[0077] Figure 14 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure. Figure 16 for Figure 14 A schematic diagram illustrating a method for manufacturing a first prism sheet in a backlight module according to an embodiment of the present disclosure. Figure 14 and Figure 16As shown, the backlight module includes: a metal backplate 11, which includes a support portion 111 and a bending portion 112, wherein the support portion 111 is located in a first plane, and the bending portion 112 forms an angle with the first plane and surrounds to form a first opening 110; a first prism sheet 12, which is disposed above the support portion 111 of the metal backplate 11 and includes a second opening 120; and a first light-shielding layer 13, which is disposed on the side of the first prism sheet 12 away from the support portion 111; wherein the orthographic projection of the first opening 110 in the first plane is located at the second opening 120. Inside the orthographic projection in the first plane, the orthographic projection of the first light-shielding layer 130 in the first plane covers the orthographic projection of the bent portion 110 in the first plane, and the orthographic projection of the first light-shielding layer 13 in the first plane at least partially overlaps with the orthographic projection of the first prism sheet 12 in the first plane; and wherein the anti-aperture light-emitting structure includes a planarization structure 124 of the first prism sheet 12 near the second opening 120, the planarization structure 124 being arranged on one side surface of the first prism sheet 12 on which a plurality of prism structures 123 are provided.

[0078] In some embodiments, such as Figure 16 As shown, in a plane perpendicular to the first direction, each prism structure 123 has a triangular cross-section, and the planarization structure 124 has a cross-section including at least one trapezoidal shape.

[0079] In some embodiments, the planarization structure may include a smooth plane parallel to the first plane.

[0080] Figure 15 This is a schematic diagram illustrating the manufacturing method of the first prism sheet in related technologies. For example... Figure 15 As shown, in related technologies, a punch is used to cut the first prism sheet 12 to form the second opening 120.

[0081] Figure 16 for Figure 14 A schematic diagram illustrating a method for manufacturing a first prism sheet in a backlight module according to an embodiment of the present disclosure. Figure 16 As shown, firstly, the portion of the first prism sheet around the hole to be punched is crushed using a pressure head 19, that is, the prism structure 123 in this portion is flattened; then, a punch head 18 is used to punch and cut to form a second opening 120, obtaining a planarized structure 124 surrounding the second opening 120 of the first prism sheet 12. By destroying the prism structure around the second opening to form a planarized structure, the refraction of light in the planarized structure of the prism is reduced, which can effectively reduce the aperture light phenomenon.

[0082] In some embodiments, such as Figure 16As shown, the width W of the flattening structure 124 can be 0.1-0.15mm, for example 0.2mm, 0.5mm, 0.8mm, 1.0mm, 1.3mm, etc.

[0083] In embodiments where the anti-aperture light-emitting structure includes the planarization structure, the orthographic projection of the anti-aperture light-emitting structure in the first plane can cover the orthographic projection of the edge of the second opening in the first plane; that is, the planarization structure can be arranged around the entire edge of the first prism sheet surrounding the second opening. In other embodiments, the planarization structure may also be arranged only on a portion of the edge of the first prism sheet surrounding the second opening; for example, the angle between the line connecting one end of the planarization structure and the center of the second opening and the second direction is in the range of 15°-30°.

[0084] Figure 7 This is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present disclosure. Figure 8 for Figure 7 The image shows a partial top view of a backlight module according to an embodiment of the present disclosure. In some embodiments, such as... Figure 7 and Figure 8 As shown, the backlight module further includes a second light-shielding layer 131, which is disposed on the side of the first prism sheet 12 facing the support portion 111; wherein, the orthographic projection of the second light-shielding layer 131 in the first plane at least partially overlaps with the orthographic projection of the first prism sheet 12 in the first plane, and the orthographic projection of the second light-shielding layer 131 in the first plane at least partially overlaps with the orthographic projection of the second opening 120 in the first plane. The orthographic projection of the second light-shielding layer 131 in the first plane is inside the orthographic projection of the first light-shielding layer 13 in the first plane.

[0085] Figure 7 The straight lines with arrows in the diagram schematically show the path of light propagation in the backlight module. By setting a second light-shielding sheet 131 between the first prism sheet 12 and the second prism sheet 14, the light reflected by the bent portion 112 of the metal back plate is absorbed by the second light-shielding layer 131 before entering the first prism sheet 12, and no aperture light appears.

[0086] In some embodiments, such as Figure 7As shown, the orthographic projection of the second light-shielding layer 131 in the first plane lies within the orthographic projection of the first light-shielding layer 13 in the first plane. Due to manufacturing limitations, the distance A between the sidewall of the second light-shielding layer 131 facing the bent portion 112 and the bent portion 112 is ≥ 0.08 mm, for example, A = 0.08 mm, A = 0.09 mm, or A = 0.1 mm; the distance B between the orthographic projections of the sidewall of the second light-shielding layer 131 away from the bent portion 112 and the sidewall of the first light-shielding layer 13 away from the bent portion 112 in the first plane is ≥ 0.05 mm, for example, B = 0.05 mm, B = 0.06 mm, or B = 0.07 mm. Figure 7 The second light-shielding layer can replace the ink on the underside of the original diffuser sheet 15, so the cost is comparable to adding diffuser screen printing.

[0087] In some embodiments, the material of the first light-shielding layer 12 may be light-shielding adhesive, and the material of the second light-shielding layer 131 may be light-shielding adhesive or black PET.

[0088] This disclosure also provides a backlight module, such as... Figure 9 As shown, the backlight module includes a metal backplate 11, which includes a support portion 111 and a bending portion 112. The support portion 11 is located in a first plane, and the bending portion 112 forms an angle with the first plane and surrounds it to form a first opening 110. A first prism sheet 12 is disposed above the support portion 111 of the metal backplate 11 and includes a second opening 120. A second prism sheet 14 is disposed on the side of the first prism sheet 12 facing the support portion 111. A third light-shielding layer 132 is disposed between the first prism sheet 12 and the second prism sheet 14. The orthographic projection of the third light-shielding layer 132 in the first plane at least partially overlaps with the orthographic projection of the first prism sheet 12 in the first plane, and the orthographic projection of the third light-shielding layer 132 in the first plane covers the orthographic projection of the bending portion 112 in the first plane.

[0089] Figure 9 The straight lines with arrows in the diagram schematically show the path of light propagation in the backlight module. By setting a third light-shielding layer 132 between the first prism sheet 12 and the second prism sheet 14, the light reflected by the bent portion 112 of the metal back plate is absorbed by the third light-shielding layer 132 before entering the first prism sheet 12, and no aperture light appears.

[0090] In embodiments of this disclosure, the bent portion of the metal back plate is typically perpendicular to the support portion. Considering manufacturing errors, the angle between the bent portion of the metal back plate and the first plane can be 90°±1°.

[0091] It should be noted that the backlight module has a symmetrical structure. Figure 7 , Figure 9 , Figure 10 and Figure 14 Only a cross-sectional view of one side of the backlight module's axis of symmetry is shown.

[0092] According to another aspect of this disclosure, a display device is also provided. Figure 17 This is a cross-sectional schematic diagram of a display device according to an embodiment of the present disclosure. Figure 17 As shown, the display device 100 includes a display panel 20 and a backlight module 10 as described in any of the foregoing embodiments. The display panel 20 includes a functional hole 200, the center of which is aligned with the center of the first opening 110. The display device can be, for example, any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. The functional hole can be, for example, a camera hole.

[0093] Figure 18 This is a photograph of the camera hole of a display device according to an embodiment of the present disclosure. Using the backlight module provided in the above embodiments of the present disclosure, the problem of light emanating from the hole can be effectively solved, such as... Figure 18 As shown, no light is emitted around the camera aperture of the display device.

[0094] In the description of this specification, references to terms such as "one embodiment," "another embodiment," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, without contradiction.

[0095] In the accompanying drawings, the thickness of certain areas and layers may be exaggerated for clarity. The same reference numerals in the figures denote the same or similar structures, and therefore their detailed descriptions are omitted. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the description of this disclosure to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical concept of this disclosure.

[0096] It will be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, areas, layers, and / or parts, these elements, components, areas, layers, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, area, layer, or part from another. Therefore, the first element, component, area, layer, or part discussed above may be referred to as the second element, component, area, layer, or part without departing from the teachings of this disclosure.

[0097] Spatial relative terms such as “row,” “column,” “below,” “above,” “left,” “right,” etc., may be used herein for ease of description to describe the relationship between one element or feature illustrated in the figures and another element(s). It will be understood that these spatial relative terms are intended to cover different orientations of the device in use or operation other than those depicted in the figures. For example, if the device in the figure is flipped, then an element described as “below other elements or features” will be oriented “above other elements or features.” Thus, the exemplary term “below” can cover both orientations above and below. Devices may be oriented in other ways (rotated 90 degrees or otherwise) and the spatial relative descriptors used herein will be interpreted accordingly. Additionally, it will be understood that when a layer is referred to as “between two layers,” it may be the only layer between those two layers, or there may be one or more intermediate layers.

[0098] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprising” and / or “including” as used in this specification designate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0099] It will be understood that when a component or layer is referred to as "on another component or layer," "connected to another component or layer," "coupled to another component or layer," or "adjacent to another component or layer," it may be directly on another component or layer, directly connected to another component or layer, directly coupled to another component or layer, or directly adjacent to another component or layer, or there may be intermediate components or layers. Conversely, when a component is referred to as "directly on another component or layer," "directly connected to another component or layer," "directly coupled to another component or layer," or "directly adjacent to another component or layer," no intermediate components or layers exist. However, in any case, "on" or "directly on" should not be interpreted as requiring a layer to completely cover the layer below.

[0100] Embodiments of this disclosure are described herein with reference to illustrative illustrations (and intermediate structures) of idealized embodiments. Therefore, variations in the illustrated shapes should be expected, for example, as a result of manufacturing techniques and / or tolerances. Consequently, embodiments of this disclosure should not be construed as limited to the specific shapes of the regions illustrated herein, but should include, for example, shape deviations due to manufacturing processes. Thus, the regions illustrated are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of a device and are not intended to limit the scope of this disclosure.

[0101] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the relevant field and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0102] As those skilled in the art will understand, although the steps of the methods in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order unless the context clearly indicates otherwise. Additional or alternatively, multiple steps may be combined into a single step, and / or a single step may be broken down into multiple steps. Furthermore, other method steps may be inserted between steps. Inserted steps may represent improvements to the method described herein, or may be unrelated to the method. Moreover, a given step may not be fully completed before the next step begins.

[0103] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A backlight module, comprising: A metal backplate includes a support portion and a bending portion, the support portion being located in a first plane, and the bending portion forming an angle with the first plane and surrounding a first opening; A first prism sheet is disposed above the support portion of the metal back plate and includes a second opening. The first prism sheet includes an anti-light-reflection structure. A first light-shielding layer is disposed on the side of the first prism sheet opposite to the support portion; Wherein, the orthographic projection of the first opening in the first plane lies within the orthographic projection of the second opening in the first plane; the orthographic projection of the first light-shielding layer in the first plane covers the orthographic projection of the bent portion in the first plane; the orthographic projection of the first light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the first prism sheet in the first plane; and The first prism sheet includes multiple prism structures, each extending along a first direction. The line connecting the point on the edge of the second opening and the center of the second opening forms an angle β with the second direction. The anti-aperture light-emitting structure is located at the edge of the second opening. The orthographic projection of the anti-aperture light-emitting structure in the first plane at least covers the orthographic projection of the edge of the second opening within the first plane when the angle β is within 15°. Both the first direction and the second direction are within the plane containing the first prism sheet, and the first direction is perpendicular to the second direction.

2. The backlight module according to claim 1, wherein, The first prism sheet includes a main body and a protrusion. The anti-aperture light-emitting structure includes the protrusion. The distance H1 between the sidewall of the protrusion facing the second opening and the bent portion of the metal back plate is less than the distance H2 between the sidewall of the main body facing the second opening and the bent portion of the metal back plate. The angle between the line connecting one end of the protrusion and the center of the second opening and the second direction is in the range of 15°-30°.

3. The backlight module according to claim 2, wherein, The distance H1 between the sidewall of the protrusion facing the second opening and the bent portion of the metal back plate is ≥0.12mm.

4. The backlight module according to claim 2, wherein, The difference between the distance H2 between the sidewall of the main body facing the second opening and the bent portion of the metal back plate and the distance H1 between the sidewall of the protrusion facing the second opening and the bent portion of the metal back plate is d, where 0 mm < d ≤ (0.03 + H2 - 0.15) mm.

5. The backlight module according to claim 1, wherein, The anti-aperture light-emitting structure includes a roughened sidewall of the first prism facing the second opening.

6. The backlight module according to claim 5, wherein, The roughened sidewall of the first prism sheet facing the second opening includes a roughened surface formed by processing the material of the first prism sheet itself.

7. The backlight module according to claim 5, wherein, The roughened sidewall of the first prism facing the second opening includes a roughened material layer disposed on the sidewall of the first prism facing the second opening.

8. The backlight module according to any one of claims 5-7, wherein, The orthographic projection of the anti-aperture light-emitting structure in the first plane covers the orthographic projection of the edge of the second opening in the first plane.

9. The backlight module according to claim 1, wherein, The anti-aperture light-emitting structure includes a planarization structure of the first prism sheet near the second opening, the planarization structure being arranged on one side surface of the first prism sheet where multiple prism structures are provided.

10. The backlight module according to claim 9, wherein, In a plane perpendicular to the first direction, each prism structure has a triangular cross-section, and the planarization structure has a cross-section including at least one trapezoidal shape.

11. The backlight module according to claim 9, wherein, The planarization structure includes a smooth plane parallel to the first plane.

12. The backlight module according to claim 9, wherein, The width of the planarization structure is 0.1-0.15 mm.

13. The backlight module according to any one of claims 9-12, wherein, The orthographic projection of the anti-aperture light-emitting structure in the first plane covers the orthographic projection of the edge of the second opening in the first plane.

14. The backlight module according to claim 1, further comprising: A second light-shielding layer is disposed on the side of the first prism facing the support portion; Wherein, the orthographic projection of the second light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the first prism sheet in the first plane, and the orthographic projection of the second light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the second opening in the first plane.

15. The backlight module according to claim 14, wherein, The orthographic projection of the second light-shielding layer in the first plane is inside the orthographic projection of the first light-shielding layer in the first plane, and the distance B between the orthographic projection of the side wall of the second light-shielding layer away from the bend and the side wall of the first light-shielding layer away from the bend in the first plane is ≥0.05mm.

16. The backlight module according to any one of claims 14-15, wherein, The material of the first light-shielding layer is light-shielding adhesive, and the material of the second light-shielding layer is light-shielding adhesive or black PET.

17. The backlight module according to claim 1, wherein, The angle between the bent portion and the first plane is 90°±1°.

18. A backlight module, comprising: A metal backplate includes a support portion and a bending portion, the support portion being located in a first plane, and the bending portion forming an angle with the first plane and surrounding a first opening; A first prism sheet is arranged above the support portion of the metal back plate and includes a second opening; The second prism sheet is arranged on the side of the first prism sheet facing the support portion; A third light-shielding layer is disposed between the first prism sheet and the second prism sheet; Wherein, the orthographic projection of the third light-shielding layer in the first plane at least partially overlaps with the orthographic projection of the first prism sheet in the first plane, and the orthographic projection of the third light-shielding layer in the first plane covers the orthographic projection of the bent portion in the first plane.

19. A display device comprising a display panel and a backlight module according to any one of claims 1-18, the display panel comprising a functional hole, the center of the functional hole being aligned with the center of the first opening.

Images