Curved display panel, method for manufacturing the same, curved display device, and electronic device

Abstract

An embodiment of the present application provides a curved display panel, a manufacturing method thereof, and a curved display device, which relate to the field of display technologies, improve the consistency of the light emission brightness of the curved display area and the flat display area in the front view angle, and improve the color deviation of the curved display area. The curved display panel includes: a display area, including a flat display area and a curved display area; a substrate, provided with an array layer, the array layer is provided with pixels, and the pixels include sub-pixels; a grating layer, located on the side of the array layer facing away from the substrate, including a grating structure located in the curved display area; the grating structure includes a first grating unit, and one first grating unit covers a sub-pixel of a first color, and the first color light signal generated by the sub-pixel of the first color is emitted through the first grating unit; the curved display area includes a first curved area and a second curved area, the bending curvature of the first curved area is less than the bending curvature of the second curved area, and the grating period of the first grating unit in the first curved area is greater than the grating period of the first grating unit in the second curved area.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and more particularly to a curved display panel, a manufacturing method thereof, a curved display device, and an electronic device. Background Art

[0002] With the continuous development of display technologies, the application forms of display panels have gradually increased. Among them, curved display panels have become the mainstream application form in current display devices such as mobile phones because they can provide users with an immersive and borderless visual experience. In particular, with the improvement of the 3D lamination process, the curved display area in the curved display panel can achieve a curvature close to 90°, enabling the curved display panel to form a "waterfall screen" or a "wrap-around screen", bringing a more extreme user experience to users.

[0003] Figure 1 FIG. is a schematic structural diagram of a curved display panel in the prior art. As Figure 1 shown, the curved display panel includes a flat display area 1' and a curved display area 2'. Among them, the flat display area 1' refers to the non-curved display area. When a user views or operates the display screen, the user's viewing angle is usually perpendicular to the plane where the flat display area 1' is located, that is, in the positive viewing angle direction PP'. Since the curved display area 2' is curved relative to the flat display area 1', then, as the curvature of the curved display area 2' increases, the light emitted by the sub-pixels 3' in the curved display area 2' will deviate more from the positive viewing angle direction PP' and be emitted obliquely, resulting in a decrease in the light emission brightness in the positive viewing angle direction PP', leading to a large brightness difference between the curved display area 2' and the flat display area 1' in the positive viewing angle direction PP', and further causing a color shift phenomenon in the curved display area 2'. For example, when displaying a white background color picture, the curved display area 2' will show a more obvious "bluish" phenomenon. In particular, in a "waterfall screen" or a "wrap-around screen", the color shift phenomenon in the curved display area 2' is particularly serious, seriously affecting the user experience.

[0004] Therefore, how to effectively improve the color shift phenomenon in the curved display area 2' has become a technical problem to be urgently solved at present. Summary of the Invention

[0005] In view of this, the present application provides a curved display panel, a manufacturing method thereof, and a curved display device, which improve the consistency of the light emission brightness of the curved display area and the flat display area in the positive viewing angle, and effectively improve the color shift phenomenon in the curved display area.

[0006] In a first aspect, an embodiment of the present application provides a curved display panel, including:

[0007] a display area, the display area including a flat display area and a curved display area;

[0008] A substrate, on one side of the substrate facing the light-emitting direction of the curved display panel, an array layer is provided, and a plurality of pixels are provided in the array layer, and each pixel includes a plurality of sub-pixels;

[0009] A grating layer, the grating layer is located on the side of the array layer facing away from the substrate, and the grating layer includes a grating structure located in the curved display area;

[0010] Wherein, the grating structure includes a plurality of first grating units, one first grating unit covers a sub-pixel of a first color, and the sub-pixel of the first color refers to a sub-pixel for generating a first color light signal, and the first color is any one of the colors of the light signals generated by the plurality of sub-pixels in the array layer, and the first color light signal generated by the sub-pixel of the first color is emitted through the first grating unit;

[0011] The curved display area includes a first curved area and a second curved area, the bending curvature of the first curved area is smaller than the bending curvature of the second curved area, and the grating period of the first grating units located in the first curved area is greater than the grating period of the first grating units located in the second curved area.

[0012] In some embodiments, along the extending direction from the inner edge to the outer edge of the curved display area, the bending curvature of the curved display area increases, and the grating periods of the plurality of first grating units in the grating structure decrease;

[0013] Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far from the flat display area.

[0014] Furthermore, the grating periods of the plurality of first grating units in the grating structure decrease linearly.

[0015] In some embodiments, the diffraction efficiencies of the plurality of first grating units in the grating structure increase.

[0016] In some embodiments, each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, then the grating structure includes a red grating unit, a green grating unit, and a blue grating unit, wherein the red grating unit covers the red sub-pixel, and the red light signal generated by the red sub-pixel is emitted through the red grating unit, the green grating unit covers the green sub-pixel, and the green light signal generated by the green sub-pixel is emitted through the green grating unit, the blue grating unit covers the blue sub-pixel, and the blue light signal generated by the blue sub-pixel is emitted through the blue grating unit;

[0017] For the same pixel, the grating period of the red grating unit covering the red sub-pixel is Pr, the grating period of the green grating unit covering the green sub-pixel is Pg, and the grating period of the blue grating unit covering the blue sub-pixel is Pb, where Pr > Pg > Pb.

[0018] In some embodiments, the grating structure includes a plurality of microstructures and a plurality of slits. The plurality of microstructures are arranged at intervals in the curved display area, and the slits are located between two adjacent microstructures. The microstructures are configured to refract and / or scatter the light emitted by the sub-pixels.

[0019] Further, along the extending direction from the inner edge to the outer edge of the curved display area, the bending curvature of the curved display area increases, and the light scattering degree and / or the light refraction degree of the plurality of microstructures in the grating structure increase;

[0020] Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far from the flat display area.

[0021] In some embodiments, along the extending direction from the inner edge to the outer edge of the curved display area, the height of the plurality of microstructures in the direction of the cross-section perpendicular to the substrate increases, and the cross-section of the substrate is the cross-section at the position corresponding to the center point of the microstructure in the substrate.

[0022] In some embodiments, the microstructure has a first cross-section, the first cross-section is parallel to the cross-section of the substrate, the cross-section of the substrate is the cross-section at the position corresponding to the center point of the microstructure in the substrate, and the shape of the first cross-section is rectangular, triangular, elliptical, circular or rhombic.

[0023] In some embodiments, the microstructure is a strip structure. In the curved display area, the plurality of microstructures are arranged along the first direction, and each microstructure extends along the second direction. The first direction is the extending direction from the inner edge to the outer edge of the curved display area, the inner edge of the curved display area is close to the flat display area, the outer edge of the curved display area is far from the flat display area, and the second direction intersects with the first direction.

[0024] In some embodiments, the curved display panel further includes:

[0025] The curved display panel further includes a packaging layer, a functional layer, an adhesive layer, a cover plate and a protective film which are stacked:

[0026] The packaging layer is used to package the array layer;

[0027] The functional layer is located on the side of the encapsulation layer facing away from the substrate

[0028] The adhesive layer is located on the side of the functional layer facing away from the substrate

[0029] The cover plate is located on the side of the adhesive layer facing away from the substrate

[0030] The protective film is located on the side of the cover plate facing away from the substrate

[0031] Wherein, the functional layer includes the grating structure

[0032] Or, the adhesive layer includes the grating structure

[0033] Or, the cover plate includes the grating structure

[0034] Or, the protective film includes the grating structure

[0035] Further, the functional layer includes a stacked touch layer and a polarizer

[0036] The touch layer is provided on the side of the encapsulation layer facing away from the substrate. The touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on the side of the touch electrode layer facing away from the substrate

[0037] The polarizer is provided on the side of the insulating layer facing away from the substrate

[0038] Wherein, the insulating layer includes the grating structure

[0039] In some embodiments, the curved display panel further includes a stacked encapsulation layer, functional layer, adhesive layer, cover plate, and protective film

[0040] The encapsulation layer is used to encapsulate the array layer

[0041] The functional layer is located on the side of the encapsulation layer facing away from the substrate

[0042] The adhesive layer is located on the side of the functional layer facing away from the substrate

[0043] The cover plate is located on the side of the adhesive layer facing away from the substrate

[0044] The protective film is located on the side of the cover plate facing away from the substrate

[0045] The grating layer is located between the encapsulation layer and the adhesive layer, or, the grating layer is located between the adhesive layer and the cover plate

[0046] Further, the functional layer includes a stacked touch layer and a polarizer;

[0047] The touch layer is disposed on a side of the encapsulation layer facing away from the substrate, and the touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on a side of the touch electrode layer facing away from the substrate;

[0048] The polarizer is disposed on a side of the insulating layer facing away from the substrate;

[0049] The grating layer is located between the touch layer and the polarizer, or the grating layer is located between the polarizer and the adhesive layer.

[0050] In some embodiments, the grating layer further includes a substrate for carrying the microstructures, and the microstructures are formed of a photosensitive adhesive material.

[0051] Based on the same inventive concept, an embodiment of the present application further provides a curved display device, including a middle frame and the curved display panel as described above, wherein the curved display panel is located in a receiving cavity formed by the middle frame.

[0052] Based on the same inventive concept, an embodiment of the present application further provides an electronic device, including the above-mentioned curved display panel and an image processor, wherein the image processor is configured to process an image displayed on the curved display panel.

[0053] Based on the same inventive concept, an embodiment of the present application further provides a method for manufacturing a curved display panel, the curved display panel including a display area, the display area including a flat display area and a curved display area, the curved display area including a first curved area and a second curved area, and a bending curvature of the first curved area being smaller than a bending curvature of the second curved area;

[0054] The manufacturing method includes:

[0055] Forming an array layer on a substrate, where a plurality of pixels are provided in the array layer, and each of the pixels includes a plurality of sub-pixels;

[0056] Forming a grating layer on a side of the array layer facing away from the substrate, the grating layer including a grating structure located in the curved display area, where the grating structure includes a plurality of first grating units, and one of the first grating units covers a sub-pixel of a first color, the sub-pixel of the first color being a sub-pixel configured to generate a light signal of a first color, the first color being any one of colors of light signals generated by the plurality of sub-pixels in the array layer, and the light signal of the first color generated by the sub-pixel of the first color is emitted through the first grating unit; a grating period of the first grating units located in the first curved area is greater than a grating period of the first grating units located in the second curved area.

[0057] In some embodiments, the process of forming the grating layer includes:

[0058] Forming a plurality of microstructures and a plurality of slits, the plurality of microstructures being spaced apart within the curved display area, the slits being located between two adjacent microstructures, and the microstructures being configured to refract and / or scatter light emitted by the sub-pixels.

[0059] In some embodiments, after forming the array layer on the substrate, the manufacturing method further includes:

[0060] Forming a packaging layer on a side of the array layer facing away from the substrate;

[0061] Forming a functional layer on a side of the packaging layer facing away from the substrate;

[0062] Forming an adhesive layer on a side of the functional layer facing away from the substrate;

[0063] Attaching a cover plate on a side of the adhesive layer facing away from the substrate;

[0064] Forming a protective film on a side of the cover plate facing away from the substrate;

[0065] Wherein, the functional layer includes the grating structure; or, the adhesive layer includes the grating structure; or, the cover plate includes the grating structure; or, the protective film includes the grating structure.

[0066] Further, when the functional layer includes the grating structure, the process of forming the functional layer includes:

[0067] Forming a touch electrode layer on a side of the packaging layer facing away from the substrate;

[0068] Forming an insulating layer on a side of the touch electrode layer facing away from the substrate, etching the insulating layer, and forming a plurality of the microstructures within the curved display area;

[0069] Providing a polarizer on a side of the insulating layer facing away from the substrate.

[0070] Further, when the cover plate includes the grating structure, the process of forming the cover plate includes:

[0071] Cutting out the slits on a side of the cover plate facing away from the substrate by a laser process, or forming the microstructures on a side of the cover plate facing the substrate by a thermoforming process.

[0072] In some embodiments, after forming the array layer on the substrate, the manufacturing method further includes:

[0073] Form a packaging layer on the side of the array layer facing away from the substrate

[0074] Form a functional layer on the side of the packaging layer facing away from the substrate

[0075] Form an adhesive layer on the side of the functional layer facing away from the substrate

[0076] Attach a cover plate on the side of the adhesive layer facing away from the substrate

[0077] Form a protective film on the side of the cover plate facing away from the substrate

[0078] Wherein, the grating layer is located between the packaging layer and the adhesive layer, or, the grating layer is located between the adhesive layer and the cover plate

[0079] Further, the process of forming the grating layer includes:

[0080] Bond the substrate to the transfer mold, and the transfer mold includes a groove for forming the micro-structure

[0081] Fill the gap between the substrate and the transfer mold with a photosensitive adhesive material

[0082] Cure the photosensitive adhesive material

[0083] Remove the transfer mold

[0084] The curved display panel, its manufacturing method, curved display device, and electronic device provided by this application have the following beneficial effects:

[0085] In the technical solution provided by the embodiments of the present invention, in the curved display area, by setting the grating layer, when the light emitted by the sub-pixels in the curved display area is incident on the grating layer, diffraction will occur in the grating structure, and the propagation direction of the diffracted light will change, causing some light to approach the positive viewing angle direction and emit. Further, in the first curved surface area with a smaller curvature, for the light emitted by the sub-pixels in this area, the diffracted light only needs to deviate from the normal by a small angle to approach the positive viewing angle direction and emit. That is to say, in this area, if you want to improve the light emission brightness at the positive viewing angle, you only need to control the diffracted light to have a small diffraction angle; while in the second curved surface area with a larger curvature, for the light emitted by the sub-pixels in this area, the diffracted light needs to deviate from the normal by a large angle to approach the positive viewing angle direction and emit. That is to say, in this area, if you want to improve the light emission brightness at the positive viewing angle, you need to control the diffracted light to have a large diffraction angle. And according to the grating formula Wherein, α is the incident angle of the incident light incident on the grating structure, β is the diffraction angle of the diffracted light after diffraction, n1 is the refractive index of the medium where the incident light is located, n2 is the refractive index of the medium where the diffracted light is located, λ is the wavelength of the incident light incident on the grating structure, P is the grating period, m is the diffraction order, m = 0, ±1, ±2, …, and when m is negative, the diffracted light deviates from one side of the normal line and sinβ is positive; when m is positive, the diffracted light deviates from the other side of the normal line and sinβ is negative. It can be seen that in the same-order diffraction, the diffraction angle β is inversely proportional to the grating period P. The smaller the grating period P, the larger the diffraction angle β of a certain non-zero-order diffraction. Therefore, in the first grating unit covering the sub-pixels of the first color, by making the grating period P2 of the first grating unit in the second curved surface area smaller than the grating period of the first grating unit in the first curved surface area, the diffracted light in the first curved surface area can have a smaller diffraction angle, while the diffracted light in the second curved surface area has a larger diffraction angle β2, so as to realize different degrees of adjustment of the diffraction angles of the diffracted light in the first curved surface area and the second curved surface area, and make the diffracted light in the first curved surface area and the second curved surface area both tend to be emitted in the positive viewing angle direction.

[0086] It can be seen that by adopting the technical solution provided by the embodiment of the present invention, in the first grating unit covering the sub-pixels of the first color, by making the grating period P2 of the first grating unit in the second curved surface area smaller than the grating period P2 of the first grating unit in the first curved surface area, the diffraction angles of the diffracted light in areas with different bending degrees can be adjusted to different degrees, so that the diffracted light in each area of the curved display area tends to be emitted in the positive viewing angle direction, effectively improving the consistency of the light emission brightness of different areas in the curved display area at the positive viewing angle, and further improving the consistency of the light emission brightness between the curved display area and the flat display area at the positive viewing angle, significantly improving the color deviation phenomenon in the curved display area, and optimizing the display performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

[0088] Figure 1 FIG. 12 is a schematic structural diagram of a curved display panel in the prior art;

[0089] Figure 2 FIG. 13 is another schematic structural diagram of a curved display panel in the prior art;

[0090] Figure 3 FIG. 14 is a schematic structural diagram of the curved display panel provided by the embodiment of the present invention;

[0091] Figure 4 is Figure 3 A cross-sectional view along the A1 - A2 direction;

[0092] Figure 5 A schematic structural diagram of the first grating unit provided by an embodiment of the present invention;

[0093] Figure 6 A schematic diagram of the grating period of the first grating unit in the first curved surface area and the second curved surface area provided by an embodiment of the present invention;

[0094] Figure 7 A schematic diagram of the grating period of the first grating unit corresponding to different color sub - pixels in the same pixel provided by an embodiment of the present invention;

[0095] Figure 8 A schematic structural diagram of the grating layer provided by an embodiment of the present invention;

[0096] Figure 9 A simulation schematic diagram of the light emission brightness of the curved surface display area at different viewing angles when the grating layer is not provided, provided by an embodiment of the present invention;

[0097] Figure 10 A simulation schematic diagram of the light emission brightness of the curved surface display area at different viewing angles after the grating layer is provided, provided by an embodiment of the present invention;

[0098] Figure 11 Another schematic structural diagram of the grating layer provided by an embodiment of the present invention;

[0099] Figure 12 A schematic diagram of the refraction of light in micro - structures with different heights provided by an embodiment of the present invention;

[0100] Figure 13 A schematic diagram of the first cross - section of the micro - structure provided by an embodiment of the present invention;

[0101] Figure 14 Another schematic diagram of the first cross - section of the micro - structure provided by an embodiment of the present invention;

[0102] Figure 15 Another schematic diagram of the first cross - section of the micro - structure provided by an embodiment of the present invention;

[0103] Figure 16 Another schematic diagram of the first cross - section of the micro - structure provided by an embodiment of the present invention;

[0104] Figure 17 Another schematic structural diagram of the micro - structure provided by an embodiment of the present invention;

[0105] Figure 18Schematic diagram when the functional layer provided by the embodiment of the present invention is multiplexed as a grating layer;

[0106] Figure 19 Schematic diagram when the adhesive layer provided by the embodiment of the present invention is multiplexed as a grating layer;

[0107] Figure 20 Schematic diagram when the cover plate provided by the embodiment of the present invention is multiplexed as a grating layer;

[0108] Figure 21 Schematic diagram when the protective film provided by the embodiment of the present invention is multiplexed as a grating layer;

[0109] Figure 22 Another schematic diagram when the protective film provided by the embodiment of the present invention is multiplexed as a grating layer;

[0110] Figure 23 Another schematic diagram when the functional layer provided by the embodiment of the present invention is multiplexed as a grating layer;

[0111] Figure 24 Yet another schematic diagram when the functional layer provided by the embodiment of the present invention is multiplexed as a grating layer;

[0112] Figure 25 Schematic diagram when the grating layer provided by the embodiment of the present invention is located between the encapsulation layer and the adhesive layer;

[0113] Figure 26 Schematic diagram when the grating layer provided by the embodiment of the present invention is located between the adhesive layer and the cover plate;

[0114] Figure 27 Another schematic diagram when the grating layer provided by the embodiment of the present invention is located between the adhesive layer and the cover plate;

[0115] Figure 28 Another schematic diagram when the grating layer provided by the embodiment of the present invention is located between the encapsulation layer and the adhesive layer;

[0116] Figure 29 Yet another schematic diagram when the grating layer provided by the embodiment of the present invention is located between the encapsulation layer and the adhesive layer;

[0117] Figure 30 Another structural schematic diagram of the grating layer provided by the embodiment of the present invention;

[0118] Figure 31 Structural schematic diagram of the curved surface display device provided by the embodiment of the present invention.

[0119] Figure 32 Is Figure 31 Cross-sectional view along the B1 - B2 direction;

[0120] Figure 33Schematic diagram of the structure of the electronic device provided by the embodiment of the present invention;

[0121] Figure 34 Flow chart of the manufacturing method provided by the embodiment of the present invention;

[0122] Figure 35 Schematic diagram of the manufacturing process of the cover plate when the cover plate is reused as the grating layer provided by the embodiment of the present invention;

[0123] Figure 36 Another schematic diagram of the manufacturing process of the cover plate when the cover plate is reused as the grating layer provided by the embodiment of the present invention;

[0124] Figure 37 Flow chart of the manufacturing process of the grating layer provided by the embodiment of the present invention;

[0125] Figure 38 For Figure 37 Corresponding structure flow chart;

[0126] Figure 39 For Figure 37 Another corresponding structure flow chart. Detailed implementation manners

[0127] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0128] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise.

[0129] Before elaborating on the technical solutions of the present invention, the present invention specifically describes the problems existing in the prior art:

[0130] In the prior art, to improve the color shift phenomenon in the curved display area of the curved display panel, usually the setting method of the light-emitting layer in the curved display area is adjusted. Figure 2 Another schematic diagram of the structure of the curved display panel in the prior art, such as Figure 2As shown in the figure, the curved display panel includes a flat display area 1″ and a curved display area 2″. In the curved display area 2″, the light-emitting layer 3″ in the organic light-emitting diode is inclined with respect to the substrate 4″. It can be understood that most of the light emitted by the light-emitting layer 3″ is emitted in the direction perpendicular to its light-emitting surface 5″, and the remaining small part of the light is divergently emitted in other directions. After the light-emitting layer 3″ is inclined with respect to the substrate 4″, the light-emitting surface 5″ of the light-emitting layer 3″ is also inclined with respect to the substrate 4″. Then, the transmission direction of most of the light emitted by the light-emitting layer 3″ in the direction perpendicular to its light-emitting surface 5″ will also be inclined along the direction towards the front viewing direction PP″, thereby improving the light-emitting brightness of the curved display area 2″ at the front viewing angle.

[0131] However, with this structure, special design of the evaporation process of other film layers between the light-emitting layer 3″ and the substrate 4″ is required to make the light-emitting layer 3″ inclined with respect to the substrate 4″, which results in a relatively high manufacturing cost and a relatively large process difficulty of the curved display panel. Moreover, for different curved display panels, the curvature of the curved display area 2″ varies. If the above setting method is adopted, each curved display panel needs to be customized for the inclination degree of the light-emitting layer 3″, which is not conducive to the realization of mass production.

[0132] Based on this, an embodiment of the present invention provides a curved display panel. Figure 3 It is a schematic structural diagram of the curved display panel provided by the embodiment of the present invention. Figure 4 For Figure 3 a cross-sectional view taken along the A1-A2 direction, as Figure 3 and Figure 4 shown, the curved display panel includes: a display area 1, the display area 1 includes a flat display area 2 and a curved display area 3. Among them, the flat display area 2 refers to the area in the display area 1 that does not bend, and the curved display area 3 refers to the area in the display area 1 that bends. The curved display area 3 can be an arc-shaped display area. It should be noted that in combination with Figure 4 , when a user views or operates the display screen, the viewing direction of the user is usually perpendicular to the plane where the flat display area 2 is located. In the embodiment of the present invention, the viewing direction perpendicular to the plane where the flat display area 2 is located is defined as the front viewing direction PP, and the viewing direction having a certain included angle with the front viewing direction PP is defined as the oblique viewing direction OP; a substrate 4, an array layer 5 is provided on one side of the substrate 4 facing the light-emitting direction of the curved display panel, and a plurality of pixels 6 are provided in the array layer 5. Each pixel 6 includes a plurality of sub-pixels 7; a grating layer 8, the grating layer 8 is located on the side of the array layer 5 facing away from the substrate 4, and the grating layer 8 includes a grating structure 9 located in the curved display area 3.

[0133] Figure 5Schematic diagram of the structure of the first grating unit provided by an embodiment of the present invention, as Figure 5 shown, the grating structure includes a plurality of first grating units 91, and one first grating unit covers a sub-pixel 71 of a first color, where the sub-pixel 71 of the first color refers to a sub-pixel for generating a first color light signal, and the first color is any one of the colors of the light signals generated by the plurality of sub-pixels 7 in the array layer 5. For example, when the plurality of sub-pixels 7 include red sub-pixels, green sub-pixels, and blue sub-pixels, the above first color may be red, green, or blue, and the first color light signal generated by the sub-pixel 71 of the first color is emitted through the first grating unit. In Figure 5 this case, sub-pixels 7 filled with the same color can be regarded as sub-pixels of the same color.

[0134] Among them, combined with Figure 5 , Figure 6 Schematic diagram of the grating period of the first grating unit in the first curved surface area and the second curved surface area provided by an embodiment of the present invention, as Figure 6 shown, the curved display area 3 includes a first curved surface area 10 and a second curved surface area 11. The bending curvature of the first curved surface area 10 is smaller than the bending curvature of the second curved surface area 11. The grating period P1 of the first grating unit 91 located in the first curved surface area 10 is greater than the grating period P2 of the first grating unit 91 located in the second curved surface area 11.

[0135] It should be noted that the above first curved surface area 10 and second curved surface area 11 do not refer to specific limitations on two certain areas. In any two areas in the curved display area 3, as long as the bending curvature of one area is greater than that of the other area, then the area with a smaller bending curvature is regarded as the first curved surface area 10, and the area with a larger bending curvature is regarded as the second curved surface area 11.

[0136] In addition, it should also be noted that when the sub-pixels 7 include red sub-pixels, green sub-pixels, and blue sub-pixels, in the first grating unit 91 overlapping with the red sub-pixels, the grating period of the first grating unit 91 located in the first curved surface area 10 is greater than the grating period of the first grating unit 91 located in the second curved surface area 11; in the first grating unit 91 overlapping with the green sub-pixels, the grating period of the first grating unit 91 located in the first curved surface area 10 is greater than the grating period of the first grating unit 91 located in the second curved surface area 11; in the first grating unit 91 overlapping with the blue sub-pixels, the grating period of the first grating unit 91 located in the first curved surface area 10 is greater than the grating period of the first grating unit 91 located in the second curved surface area 11. Figure 6The change in the grating period of the grating structure 9 shown can be understood as the change in the grating period of the first grating unit 91 corresponding to the red sub-pixel, or, it can also be understood as the change in the grating period of the first grating unit 91 corresponding to the green sub-pixel, or, it can further be understood as the change in the grating period of the first grating unit 91 corresponding to the blue sub-pixel.

[0137] In addition, it should be noted that, please refer to again Figure 4 , each sub-pixel 7 includes a pixel driving circuit 12 and an organic light-emitting diode 13 which are electrically connected. Among them, the pixel driving circuit 12 includes a thin-film transistor 14, and the pixel driving circuit 12 is used to provide a driving current to the organic light-emitting diode 13 to drive it to emit light. Further, the thin-film transistor 14 includes an active layer 15, a gate layer 16, and a source-drain layer 17 which are sequentially arranged along the light-emitting direction of the curved display panel. The organic light-emitting diode 13 includes an anode layer 18, a light-emitting layer 19, and a cathode layer 20 which are sequentially arranged along the light-emitting direction of the curved display panel. In the embodiments of the present invention, the light emitted by the sub-pixel 7 all refers to the light emitted by the light-emitting layer 19 in the sub-pixel 7. The active layer 15, the gate layer 16, the source-drain layer 17, the anode layer 18, the light-emitting layer 19, the cathode layer 20, and the insulating layer between any two of these six film layers constitute the above-mentioned array layer 5. In addition, it should be noted that, Figure 4 the pixel driving circuit 12 shown only includes one thin-film transistor 14, which is only for illustrative purposes. In practical applications, the pixel driving circuit 12 may include multiple thin-film transistors 14.

[0138] In the curved display panel provided by the embodiments of the present invention, in the curved display area 3, by providing a grating layer 8, when the light emitted by the sub-pixel 7 in the curved display area 3 is incident on the grating layer 8, diffraction will occur in the grating structure 9, and the propagation direction of the diffracted light will change, causing part of the light to approach the positive viewing direction PP and emit. Further, please refer to again Figure 6 , in the first curved surface area 10 with a smaller degree of curvature, for the light emitted by the sub-pixel 7 in this area, the diffracted light DL1 only needs to deviate from the normal N1 by a small angle to approach the positive viewing direction PP and emit. That is to say, in this area, if you want to improve the light-emitting brightness at the positive viewing angle, only need to control the diffracted light to have a small diffraction angle β1; while in the second curved surface area 11 with a larger degree of curvature, for the light emitted by the sub-pixel 7 in this area, the diffracted light DL2 needs to deviate from the normal N2 by a large angle to approach the positive viewing direction PP and emit. That is to say, in this area, if you want to improve the light-emitting brightness at the positive viewing angle, you need to control the diffracted light to have a large diffraction angle β2. And according to the grating formula Among them, α is the incident angle of the incident light incident on the grating structure 9, β is the diffraction angle of the diffracted light after diffraction, n1 is the refractive index of the medium where the incident light is located, n2 is the refractive index of the medium where the diffracted light is located, λ is the wavelength of the incident light incident on the grating structure 9, P is the grating period, m is the diffraction order, m = 0, ±1, ±2, …, and when m is negative, the diffracted light deviates from one side of the normal line and sinβ is positive; when m is positive, the diffracted light deviates from the other side of the normal line and sinβ is negative. It can be seen that in the same-order diffraction, the diffraction angle β is inversely proportional to the grating period P. The smaller the grating period P, the larger the diffraction angle β of a certain non-0-order diffraction. Therefore, in the first grating unit 91 of the sub-pixel 71 covering the first color, by making the grating period P2 of the first grating unit 91 in the second curved surface area 11 smaller than the grating period P1 of the first grating unit 91 in the first curved surface area 10, the diffracted light in the first curved surface area 10 can have a smaller diffraction angle β1, while the diffracted light in the second curved surface area 11 can have a larger diffraction angle β2, so as to realize different degrees of adjustment of the diffraction angles of the diffracted light in the first curved surface area 10 and the second curved surface area 11, making the diffracted light in both the first curved surface area 10 and the second curved surface area 11 approach the positive viewing direction PP and emit light.

[0139] It can be seen that by using the curved display panel provided by the embodiment of the present invention, in the first grating unit 91 of the sub-pixel 71 covering the first color, by making the grating period P2 of the first grating unit 91 in the second curved surface area 11 smaller than the grating period P2 of the first grating unit 91 in the first curved surface area 10, the diffraction angles of the diffracted light in areas with different bending degrees can be adjusted to different degrees, so that the diffracted light in each area of the curved display area 3 approaches the positive viewing direction PP and emits light, effectively improving the consistency of the light-emitting brightness of different areas of the curved display area 3 in the positive viewing angle, and further improving the consistency of the light-emitting brightness of the curved display area 3 and the flat display area 2 in the positive viewing angle, significantly improving the color deviation phenomenon of the curved display area 3, and optimizing the display performance.

[0140] In addition, it should be noted that according to the grating diffraction principle, after the mixed light with different wavelengths passes through the grating structure 9 and is diffracted, an m-order diffraction spectrum will be obtained, m = 0, ±1, ±2, … In the same-order diffraction, the lights with different wavelengths in the mixed light will be dispersed after diffraction, and the dispersed lights are arranged in the order of wavelength to form a series of discrete spectral lines. In the m-order diffraction, the intensity of the 0-order diffraction is the strongest, and as |m| increases, the intensity of the m-order diffraction gradually decreases. In the embodiment of the present invention, the diffraction angle corresponding to the non-0-order diffraction can be adjusted by adjusting the grating period, so that the first-order diffraction light with greater intensity approaches the positive viewing direction PP and emits light, compensating the light-emitting brightness of the curved display area 3 in the positive viewing angle to a greater extent.

[0141] Exemplarily, it is assumed that the second curved surface area 11 is bent by 90° compared to the planar area 2, and the refractive index n1 of the medium where the incident light is located and the refractive index n2 of the medium where the diffracted light is located are both 1.5. For the green light with a central wavelength of 550 nm emitted by the green sub-pixel, taking the light ray emitted in the direction parallel to the normal direction, that is, the incident angle α is 0 as an example, if it is desired to adjust the diffraction angle β of the light ray after the first-order diffraction of this part of the light ray to 45°, according to the grating formula, the grating period P can be obtained as 519 nm. Since the wavelength range of green light is 500 nm to 600 nm, considering the change in the wavelength of green light, based on the grating period of 519 nm corresponding to the green light of 550 nm, the value of the grating period can also be fluctuated up and down by 50 nm to match green lights of different wavelengths. At this time, the grating period of the first grating unit 91 corresponding to the green sub-pixel can be adjusted within the range of 569 nm to 469 nm.

[0142] In one embodiment, please refer to Figure 5 and Figure 6 , along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, (such as Figure 5 and Figure 6 the direction indicated by the dashed arrow in), the bending curvature of the curved display area 3 increases, and the grating periods of the multiple first grating units 91 in the grating structure 9 decrease, where the inner edge 211 of the curved display area 3 is close to the planar display area 2, and the outer edge 212 of the curved display area 3 is far from the planar display area 2.

[0143] For example, in the first grating unit 91 corresponding to the red sub-pixel, the grating periods of this part of the first grating units 91 decrease along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3. In the first grating unit 91 corresponding to the green sub-pixel, the grating periods of this part of the first grating units 91 decrease along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3. In the first grating unit 91 corresponding to the blue sub-pixel, the grating periods of this part of the first grating units 91 decrease along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3.

[0144] It should be noted that the limitation of the inner edge 211 of the curved display area 3 in the embodiment of the present invention is only for clearly indicating the increasing direction of the bending curvature of the curved display area 3. In the actual product structure, the planar display area 2 and the curved display area 3 are connected, and there is no such entity structure as the inner edge 211 of the curved display area 3.

[0145] As can be seen from the above analysis, the closer to the outer edge 212 of the curved display area 3, the greater the degree of curvature of the curved display area 3. In this area, it is necessary to make the first grating unit 91 have a smaller grating period, so that the diffracted light has a larger diffraction angle β, and further make the diffracted light tend to be emitted in the positive viewing direction PP. Therefore, in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3, by making the grating period of the first grating unit 91 corresponding to the sub-pixels 71 covering the first color decrease, the diffraction angle of the diffracted light in this direction can be increased, so that the diffracted light in each area of the curved display area 3 tends to be emitted in the positive viewing direction PP, and further the color shift in each area of the curved display area 3 can be effectively improved.

[0146] Furthermore, along the extension direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the grating periods of the multiple first grating units 91 in the grating structure 9 decrease linearly, so that the grating periods change gradually in a regular pattern, and further the diffraction angles of the diffracted light are adjusted regularly.

[0147] In one embodiment, along the extension direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the diffraction efficiencies of the multiple first grating units 91 in the grating structure 9 increase. For example, in the first grating unit 91 corresponding to the red sub-pixels, the diffraction efficiency of this part of the first grating unit 91 increases in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3. In the first grating unit 91 corresponding to the green sub-pixels, the diffraction efficiency of this part of the first grating unit 91 increases in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3. In the first grating unit 91 corresponding to the blue sub-pixels, the diffraction efficiency of this part of the first grating unit 91 increases in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3. Specifically, the diffraction efficiency of the first grating unit 91 can be adjusted by adjusting the duty cycle, height of the first grating unit 91, and the refractive index difference between the first grating unit 91 and the external medium.

[0148] As can be seen from the above analysis, the greater the bending curvature of the curved display area 3, the greater the deviation between the propagation direction of the light emitted by the sub-pixel 7 and the positive viewing direction PP, and the more difficult it is to adjust the diffracted light to be emitted in the positive viewing direction PP. As a result, the number of diffracted lights that meet the requirement of being emitted in the positive viewing direction PP is small, and the light emission brightness in the positive viewing angle is correspondingly low. Therefore, along the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, by increasing the diffraction efficiency of the multiple first grating units 91 in the grating structure 9, the light emission intensity of the diffracted light in the area with a larger bending degree can be increased, so that the number of diffracted lights tending to be emitted in the positive viewing direction PP increases, and further increases the light emission brightness of this part of the area in the positive viewing angle, and improves the uniformity of the light emission brightness of different areas of the curved display area 3 in the positive viewing angle.

[0149] It should be noted that in the embodiment of the present invention, the diffraction efficiency of the first-order diffraction with greater intensity can be adjusted to make the first-order diffracted light with greater intensity more tend to be emitted in the positive viewing direction PP, so as to compensate the light emission brightness of the curved display area 3 in the positive viewing angle to a greater extent.

[0150] In one implementation manner, Figure 7 is a schematic diagram of the grating periods of the first grating units corresponding to different color sub-pixels in the same pixel provided by the embodiment of the present invention. As Figure 7 shown, each pixel 6 includes a red sub-pixel 22, a green sub-pixel 23, and a blue sub-pixel 24; the grating structure 9 includes a red grating unit 25, a green grating unit 26, and a blue grating unit 27. Among them, the red grating unit 25 covers the red sub-pixel 22, and the red light signal generated by the red sub-pixel 22 is emitted through the red grating unit 25. The green grating unit 26 covers the green sub-pixel 23, and the green light signal generated by the green sub-pixel 23 is emitted through the green grating unit 26. The blue grating unit 27 covers the blue sub-pixel 24, and the blue light signal generated by the blue sub-pixel 24 is emitted through the blue grating unit 27. For the same pixel 6, the grating period of the red grating unit 25 covering the red sub-pixel 22 is Pr, the grating period of the green grating unit 26 covering the green sub-pixel 23 is Pg, and the grating period of the blue grating unit 27 covering the blue sub-pixel 24 is Pb. Pr, Pg, and Pb satisfy: Pr > Pg > Pb.

[0151] It can be understood that the positions of the red sub-pixel 22, the green sub-pixel 23, and the blue sub-pixel 24 in the same pixel 6 are close. Therefore, the degree of bending of the regions where these red sub-pixels 22, green sub-pixels 23, and blue sub-pixels 24 are located in the curved display area 3 can be regarded as the same. However, due to the different wavelengths of red light, green light, and blue light, with the wavelength of red light being the largest and the wavelength of blue light being the smallest, according to the grating formula, when the incident angle α is the same, by making Pr, Pg, and Pb satisfy: Pr > Pg > Pb, the diffraction angles of red light, green light, and blue light in the same pixel 6 can tend to be the same. Then, after diffraction, the light rays of different colors emitted from the same pixel 6 can tend to be transmitted in the same direction, thereby ensuring the accuracy of the color presented by the pixel 6 and further improving the color deviation phenomenon.

[0152] In one embodiment, Figure 8 is a schematic structural diagram of the grating layer provided by the embodiment of the present invention. As Figure 8 shown, the grating structure 9 includes a plurality of microstructures 28 and a plurality of slits 29. The plurality of microstructures 28 are arranged at intervals in the curved display area 3. The slit 29 is located between two adjacent microstructures 28. The incident light incident on the grating structure 9 diffracts in the slit 29. At the same time, the microstructure 28 is also used to refract and / or scatter the light emitted from the sub-pixel 7. At this time, the width of the slit 29 is on the order of dozens of micrometers, and the microstructure 28 can be a light-transmitting prism structure.

[0153] In this structure, the grating structure 9 can not only utilize the slit 29 to achieve diffraction, but when part of the light is incident on the microstructure 28, it can further utilize the microstructure 28 to refract and / or scatter this part of the light to adjust the propagation direction of this part of the light to make it tend to be transmitted in the positive viewing angle direction PP, so as to more greatly improve the light output brightness of the curved display area 3 at the positive viewing angle.

[0154] Therefore, the applicant also conducted simulation tests on the light output brightness of the curved display area 3 when the grating layer 8 is not provided in the curved display panel and the light output brightness of the curved display area 3 when the grating layer 8 is provided in the curved display panel. Under the condition that the curved display area 3 is bent by 90° compared with the flat display area 2, Figure 9 is a schematic simulation diagram of the light output brightness of the curved display area without the grating layer provided by the embodiment of the present invention. As Figure 9 shown, if the grating layer 8 is not used to diffract, refract, and / or scatter the light, as shown by the actual simulation curve in the figure, the light intensity of the curved display area 3 reaches the maximum at an oblique viewing angle of about +60°, and the light intensity at the positive viewing angle (viewing angle is 0°) is almost zero. Figure 10 is a schematic simulation diagram of the light output brightness of the curved display area after the grating layer is provided by the embodiment of the present invention. As Figure 10As shown, after the light is diffracted, refracted, and / or scattered by the grating layer 8, as shown by the actual simulation curve in the figure, the light intensity in the curved display area 3 decreases at an oblique viewing angle, while the light intensity at the normal viewing angle (viewing angle is 0°) increases to about 35% of the peak intensity. It can be seen that by using the grating layer provided in the embodiment of the present invention, the light output brightness in the curved display area 3 at the normal viewing angle can be effectively increased, and the color shift phenomenon in the curved display area 3 can be improved.

[0155] It should be noted that when the applicant conducted the above simulation test, it was based on Figure 3 the curved display panel with the structure as shown for the test. In the Figure 3 structure of the curved display panel as shown, the curved display panel has a major axis K1 and a minor axis K2. On both sides of the curved display panel in the direction of the minor axis K2, a curved display area 3 is respectively provided, and no curved display area 3 is provided on both sides of the curved display panel in the direction of the major axis K1. Among them, Figure 9 and Figure 10 the actual simulation curves shown in represent the brightness distribution of the curved display panel at different viewing angles in the direction of the minor axis K2, Figure 9 and Figure 10 the reference curves shown in represent the brightness distribution of the curved display panel at different viewing angles in the direction of the major axis K1. Since no curved display area 3 is provided on both sides of the curved display panel in the direction of the major axis K1, there is no brightness distribution situation of the curved display area 3 at different viewing angles. Therefore, the above analysis is all based on the actual simulation curves.

[0156] In addition, it should be noted that Figure 3 the structure of the curved display panel as shown is only for illustrative purposes. In other alternative embodiments of the present invention, a curved display area 3 can be respectively provided on both sides of the curved display panel in the direction of the minor axis K2 and on both sides of the curved display panel in the direction of the major axis K1.

[0157] In one embodiment, please refer to again Figure 8 , along the extension direction from the inner edge 211 to the outer edge 212 of the curved display area 3 ( Figure 8 the direction indicated by the dashed arrow in), the bending curvature of the curved display area 3 increases, and the light scattering degree and / or light refraction degree of the multiple microstructures 28 in the grating structure 9 increase. Among them, the inner edge 211 of the curved display area 3 is close to the flat display area 2, and the outer edge 212 of the curved display area 3 is far from the flat display area 2.

[0158] As can be seen from the above analysis, the greater the bending curvature of the curved display area 3, the more serious the color shift phenomenon. Therefore, along the extension direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the light scattering degree and / or light refraction degree of the microstructures 28 increase. In the areas with greater bending degree, a greater number of light rays will undergo refraction and / or scattering, so that a greater number of refracted light rays can tend to be emitted in the positive viewing angle direction PP, achieving different degrees of improvement in the light emission brightness at the positive viewing angle of different areas, and further improving the uniformity of the light emission brightness between the curved display area 3 and the flat display area 2 at the positive viewing angle.

[0159] Furthermore, the light scattering degree and / or light refraction degree of the microstructures 28 can be adjusted by adjusting the height of the microstructures 28. Figure 11 Another schematic structural diagram of the grating layer provided by the embodiment of the present invention is shown in Figure 11 As shown, along the extension direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the height h of the multiple microstructures 28 increases in the direction of their respective cross-sections perpendicular to the substrate 4. Here, the cross-section of the substrate 4 refers to the cross-section at the position corresponding to the center point of the microstructures 28 in the substrate 4. The height of the microstructures 28 can vary within the range of 5 μm to 20 μm, so as to avoid an excessive thickness of the grating layer 8 while ensuring a good refraction effect, thereby avoiding an adverse impact on the overall module thickness of the curved display panel.

[0160] Taking refraction as an example, Figure 12 A schematic diagram of the refraction of light rays in the microstructures with different heights provided by the embodiment of the present invention is shown in Figure 12As shown, the height of the microstructure 28 determines the angle θ between the side surface and the bottom surface of the microstructure 28. Herein, the bottom surface of the microstructure 28 refers to the surface of the microstructure 28 close to the substrate 4, and the side surface of the microstructure 28 refers to the surface intersecting with the bottom surface. The larger the height of the microstructure 28, the larger the value of θ. When light is incident on the microstructure 28 in a certain direction, the larger θ is, the smaller the angle between the positive viewing direction PP and the normal, that is, 90 - θ. When the refraction angle of the refracted light is δ and 90 - θ + δ approaches 0°, the angle between the refracted light and the positive viewing direction PP tends to 0, and the refracted light will tend to emit in the positive viewing direction PP. Since the color deviation phenomenon in the region with a larger bending degree is more serious, therefore, a greater degree of compensation for the light emission brightness in the positive viewing angle is required in this region. In the embodiment of the present invention, by making the height of the microstructure 28 increase in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3, it can be made that in the region with a larger bending degree, the θ of the microstructure 28 is larger, and then 90 - θ is smaller, so that the refraction angles δ corresponding to more refracted lights can satisfy 90 - θ + δ approaching 0°, and then more refracted lights can tend to emit in the positive viewing direction PP, and a greater degree of compensation for the light emission brightness in the positive viewing angle is performed. Specifically, taking the microstructure 28 located in the region of the curved display area 3 bent by 90° compared with the flat display area 2 as an example, please refer to again Figure 12 , in the microstructure 28 with a smaller height, since θ1 is smaller, therefore, 90 - θ1 is larger. Then, only the refracted light with a smaller refraction angle δ1 can satisfy 90 - θ1 + δ1 approaching 0°. Therefore, only a small amount of refracted light can tend to emit in the positive viewing direction PP; while in the microstructure 28 with a larger height, since θ2 is larger, therefore, 90 - θ2 is smaller. At this time, a slightly larger refraction angle δ2 can also satisfy 90 - θ2 + δ2 approaching 0°, so that a larger number of refracted lights can tend to emit in the positive viewing direction PP, and the light emission brightness in the positive viewing angle of this region is increased to a greater extent.

[0161] In addition, it should be noted that according to the refraction formula n1sinμ = n2sinδ, where n1 is the refractive index of the medium where the incident light is located and n2 is the refractive index of the medium where the refracted light is located, it can be seen that by adjusting n1 and n2, the incident light with a determined incident angle can have a smaller refraction angle δ, so that 90 - θ + δ is more likely to approach 0°.

[0162] In one implementation, in combination with Figures 13 - 16, the microstructure 28 has a first cross-section 30, and the first cross-section 30 is parallel to the cut surface of the substrate 4, where the cut surface of the substrate 4 refers to the cut surface at the position corresponding to the center point of the microstructure 28 in the substrate 4. The shape of the first cross-section 30 is rectangular, triangular, elliptical, circular or rhombic. At this time, the microstructures 28 can be distributed in a dot pattern. Of course, in other embodiments of the present invention, the first cross-section 30 can also be other irregular shapes.

[0163] It should be noted that in the curved surface display area 3, the first cross-sections 30 of different microstructures 28 can be of the same shape. For example, in combination with Figure 8 , Figure 13 is a schematic diagram of the first cross-section of the microstructure provided by the embodiment of the present invention. As Figure 13 shown, the first cross-sections 30 of the microstructures 28 in the curved surface display area 3 are all triangular. At this time, the microstructures 28 are all pyramid structures. Or, in combination with Figure 4 , Figure 14 is another schematic diagram of the first cross-section of the microstructure provided by the embodiment of the present invention. As Figure 14 shown, the first cross-sections 30 of the microstructures 28 in the curved surface display area 3 are all circular. At this time, the microstructures 28 are all cylindrical structures. Or, Figure 15 is still another schematic diagram of the first cross-section of the microstructure provided by the embodiment of the present invention. As Figure 15 shown, the first cross-sections 30 of the microstructures 28 in the curved surface display area 3 are all rhombic. Or, in the curved surface display area 3, the first cross-sections 30 of different microstructures 28 can also have the same shape. For example, Figure 16 is yet another schematic diagram of the first cross-section of the microstructure provided by the embodiment of the present invention. As Figure 16 shown, the shape of the first cross-section 30 of some microstructures 28 in the curved surface display area 3 is triangular, the shape of the first cross-section 30 of some microstructures 28 is circular, and the shape of the first cross-section 30 of other microstructures 28 is rhombic. By adopting the above setting method, the setting flexibility of the shape of the microstructure 28 can be improved. Moreover, setting the first cross-section 30 of the microstructure 28 to the above conventional shapes can also reduce the structural complexity of the microstructure 28 and simplify the process difficulty.

[0164] Or, Figure 17 is another structural schematic diagram of the microstructure provided by the embodiment of the present invention. As Figure 17As shown, the microstructure 28 is a strip structure. In the curved display area 3, multiple microstructures 28 are arranged in the first direction, and a single microstructure 28 extends in the second direction. The first direction is the extension direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3. The inner edge 211 of the curved display area 3 is close to the flat display area 2, and the outer edge 212 of the curved display area 3 is far from the flat display area 2. The second direction intersects the first direction. At this time, the slit 29 formed between the microstructures 28 is a strip slit, so that the grating structure 9 has better diffraction performance.

[0165] In one embodiment, in combination with Figures 18 - 21 , the curved display panel further includes an encapsulation layer 31, a functional layer 32, an adhesive layer 33, a cover plate 34, and a protective film 35. Among them, the encapsulation layer 31 is used to cover the array layer 5 and encapsulate the array layer 5 to prevent external water and oxygen from penetrating into the array layer 5. The functional layer 32 is located on the side of the encapsulation layer 31 facing away from the substrate 4 and is used to implement functions such as touch control and polarization. The adhesive layer 33 is located on the side of the functional layer 32 facing away from the substrate 4 and can be specifically formed of a transparent optical adhesive material. The cover plate 34 is located on the side of the adhesive layer 33 facing away from the substrate 4 and can be specifically made of glass material and is bonded and fixed to the functional layer 32 through the adhesive layer 33. The protective film 35 is located on the side of the cover plate 34 facing away from the substrate 4 and can be specifically formed of a polyester resin material to cover the cover plate 34 and protect the display module.

[0166] Based on the above structure, Figure 18 is a schematic diagram when the functional layer in the embodiment of the present invention is multiplexed as a grating layer. As Figure 18 shown, the functional layer 32 includes a grating structure 9. At this time, the functional layer 32 is multiplexed as a grating layer 8, and the functional layer 32 has functions such as touch control, polarization, and diffraction of light. Figure 19 is a schematic diagram when the adhesive layer in the embodiment of the present invention is multiplexed as a grating layer. As Figure 19 shown, the adhesive layer 33 includes a grating structure 9. At this time, the adhesive layer 33 is multiplexed as a grating layer 8, and the adhesive layer 33 has functions such as adhesion and diffraction of light. Figure 20 is a schematic diagram when the cover plate in the embodiment of the present invention is multiplexed as a grating layer. As Figure 20 shown, the cover plate 34 includes a grating structure 9. At this time, the cover plate 34 is multiplexed as a grating layer 8, and the cover plate 34 has the function of diffracting light. Figure 21 is a schematic diagram when the protective film in the embodiment of the present invention is multiplexed as a grating layer. As Figure 21As shown, the protective film 35 includes a grating structure 9. At this time, the protective film 35 is reused as the grating layer 8, and the protective film 35 has both the functions of protection and light diffraction. With the above arrangement, the grating layer 8 can be formed by reusing the original film layer in the curved display panel, without the need to additionally add a film layer, so that the grating layer 8 does not need to additionally occupy the film layer space, which is more conducive to the thinning design of the curved display panel.

[0167] In addition, it should be noted that when the grating layer 8 is reused with the above film layer, the micro-structure 28 can be located on the side of the film layer facing the substrate 4 or on the side of the film layer facing away from the substrate 4. For example, please refer to again Figure 21 , when the protective film 35 is reused as the grating layer 8, the micro-structure 28 can be located on the side of the protective film 35 facing away from the substrate 4, or Figure 22 FIG. is another schematic diagram when the protective film provided by the embodiment of the present invention is reused as the grating layer. As Figure 22 shown, the micro-structure 28 can also be located on the side of the protective film 35 facing the substrate 4. In addition, it should be noted that when the protective film 35 is reused as the grating layer 8, the grating layer 8 and the protective film 35 can be reused by forming the micro-structure 28 and the slit 29 on the polyester resin substrate, so that the film layer has both a protective function and an optical function.

[0168] Furthermore, Figure 23 FIG. is another schematic diagram when the functional layer provided by the embodiment of the present invention is reused as the grating layer. As Figure 23 shown, the functional layer 32 includes a touch layer 36 and a polarizer 37. Among them, the touch layer 36 is provided on the side of the encapsulation layer 31 facing away from the substrate 4. The touch layer 36 includes a touch electrode layer 38 and an insulating layer 39. The insulating layer 39 is located on the side of the touch electrode layer 38 facing away from the substrate 4; the polarizer 37 is provided on the side of the insulating layer 39 facing away from the substrate 4; the insulating layer 39 in the touch layer 36 includes a grating structure 9. At this time, the insulating layer 39 is reused as the grating layer 8.

[0169] It should be noted that in the manufacturing process of the curved display panel, the multiple film layers included in the array layer 5 can be formed by semiconductor processes such as coating and photolithography. Please refer to again Figure 23, the encapsulation layer 31 includes a plurality of overlapping organic encapsulation layers 61 and inorganic encapsulation layers 62. The organic encapsulation layer 61 and the inorganic encapsulation layer 62 can be specifically formed by semiconductor processes such as chemical vapor deposition and inkjet printing. The touch electrode layer 38 can specifically include a buffer layer 63, a first electrode layer 64, an electrode insulating layer 65, and a second electrode layer 66 sequentially arranged along the light-emitting direction of the curved display panel. These film layers can also be formed by semiconductor processes such as coating and photolithography. Therefore, during the manufacturing process of the curved display panel, the array layer 5, the encapsulation layer 31, and the touch layer 36 can be continuously formed on the same production line using semiconductor processes, and then structures such as the polarizer 37, the adhesive layer 33, the cover plate 34, and the protective film 35 are placed on the side of the touch layer 36 facing away from the array layer 5.

[0170] Therefore, in the embodiments of the present invention, when the functional layer 32 is reused as the grating layer 8, by reusing the grating layer 8 and the insulating layer 39 in the touch layer 36, after the process flows of the array layer 5, the encapsulation layer 31, and the touch layer 36 are completed, microstructures 28 and slits 29 can be formed on the insulating layer 39 by semiconductor processes such as photolithography. This setting method does not require adjusting the original process flows of the array layer 5, the encapsulation layer 31, and the touch layer 36, and only needs to add a photolithography process in the last process of forming the insulating layer 39. The process complexity is relatively low and it is easier to implement.

[0171] In addition, it should be noted that generally, the thickness of the insulating layer 39 is in the range of 1 - 10 μm. When etching the insulating layer 39 using photolithography, please refer to Figure 23 again, and it is possible to etch a part of the insulating layer 39 in the area where the slit 29 is located. For example, only etch a thickness of 5 μm at the slit 29, or Figure 24 is another schematic diagram when the functional layer provided by the embodiments of the present invention is reused as the grating layer. As Figure 24 shown, it is also possible to etch away all of the insulating layer 39 in the area where the slit 29 is located.

[0172] In one implementation, in combination with Figure 25 and Figure 26, the curved display panel further includes a packaging layer 31, a functional layer 32, an adhesive layer 33, a cover plate 34, and a protective film 35. Among them, the packaging layer 31 is used to cover the array layer 5 and package the array layer 5 to prevent external water and oxygen from penetrating into the array layer 5. The functional layer 32 is located on the side of the packaging layer 31 facing away from the substrate 4 and is used to implement functions such as touch control and polarization. The adhesive layer 33 is located on the side of the functional layer 32 facing away from the substrate 4 and can be specifically formed of a transparent optical adhesive material. The cover plate 34 is located on the side of the adhesive layer 33 facing away from the substrate 4 and can be specifically made of glass, and is bonded and fixed to the functional layer 32 through the adhesive layer 33. The protective film 35 is located on the side of the cover plate 34 facing away from the substrate 4 and can be specifically formed of a polyester resin material, and is used to cover the cover plate 34 to protect the display module.

[0173] Based on the above structure, Figure 25 is a schematic diagram of the grating layer provided by the embodiment of the present invention when it is located between the packaging layer and the adhesive layer, as Figure 25 shown, the grating layer 8 is located between the packaging layer 31 and the adhesive layer 33, or, Figure 26 is a schematic diagram of the grating layer provided by the embodiment of the present invention when it is located between the adhesive layer and the cover plate, as Figure 26 shown, the grating layer 8 is located between the adhesive layer 33 and the cover plate 34. At this time, the grating layer 8 is an independently provided film layer and is not multiplexed with the original film layers in the curved display panel, so there is no need to adjust the process of the original film layers, reducing the manufacturing complexity of the curved display panel.

[0174] It should be noted that when the grating layer 8 is an independently provided film layer, the microstructures 28 can be located on the side of the grating layer 8 facing the substrate 4 or on the side of the grating layer 8 facing away from the substrate 4. For example, please refer to Figure 26 again. When the grating layer 8 is located between the adhesive layer 33 and the cover plate 34, the microstructures 28 can be located on the side of the grating layer 8 facing away from the substrate 4, or, Figure 27 is another schematic diagram of the grating layer provided by the embodiment of the present invention when it is located between the adhesive layer and the cover plate, as Figure 27 shown, the microstructures 28 can also be located on the side of the grating layer 8 facing the substrate 4.

[0175] Furthermore, in combination with Figure 28 and Figure 29 , the functional layer 32 includes a touch control layer 36 and a polarizer 37. Among them, the touch control layer 36 is provided on the side of the packaging layer 31 facing away from the substrate 4, and the touch control layer 36 includes a touch control electrode layer 38 and an insulating layer 39. At this time, Figure 28 is another schematic diagram of the grating layer provided by the embodiment of the present invention when it is located between the packaging layer and the adhesive layer, as Figure 28 shown, the grating layer 8 is located between the touch control layer 36 and the polarizer 37, or, Figure 29Another schematic diagram of the grating layer provided in the embodiment of the present invention when it is located between the encapsulation layer and the adhesive layer, as Figure 29 shown, the grating layer 8 is located between the polarizer 37 and the adhesive layer 33.

[0176] During the manufacturing process of the curved display panel, since the array layer 5, the encapsulation layer 31, and the touch layer 36 are formed by semiconductor processes on the same production line, therefore, by disposing the grating layer 8 on the side of the touch layer 36 facing away from the substrate 4, there is no need to adjust the original process flow of the encapsulation layer 31 and the touch layer 36, reducing the process complexity.

[0177] In one embodiment, Figure 30 Another structural schematic diagram of the grating layer provided in the embodiment of the present invention, as Figure 30 shown, the grating layer 8 further includes a substrate 40 for carrying the microstructures 28, and the microstructures 28 are formed of a photosensitive adhesive material. Specifically, the grating layer 8 of this structure can be formed by using a UV transfer method: the substrate 40 is attached to the transfer mold, the transfer mold includes grooves for forming the microstructures 28, after attachment, a photosensitive adhesive material is filled in the gap between the substrate 40 and the transfer mold, and then the photosensitive adhesive material is cured and the transfer mold is removed, so that the cured photosensitive adhesive material forms the microstructures 28.

[0178] Furthermore, when the grating layer 8 is disposed as an independent film layer in the curved display panel, a layer of adhesive layer can be further provided on the outer side of the grating layer 8 to improve the adhesion between the grating layer 8 and other film layers, thereby improving the stability of the setting of the grating layer 8. At this time, after curing the photosensitive adhesive material and removing the transfer mold, a layer of adhesive layer, such as a transparent optical adhesive, can be attached to the side of the substrate 40 facing away from the microstructures 28, and / or on the side of the microstructures 28 facing away from the substrate 40. In addition, to protect the formed grating layer 8 from damage, a grating protection film can be provided on the side of the substrate 40 facing away from the microstructures 28 or on the side of the adhesive layer attached to the substrate 40 facing away from the microstructures 28, and it can be removed when the grating layer 8 is subsequently placed in the curved display panel.

[0179] In addition, it should be noted that whether the grating layer 8 is reused as an original film layer in the curved display panel or is realized as an independent film layer, the formation of the pattern of the microstructures 28 can be achieved through a customized mold, such as the above-mentioned transfer mold, and can be flexibly designed for curved display panels with different bending conditions.

[0180] Based on the same inventive concept, the embodiment of the present invention provides a curved display device, Figure 31 which is a structural schematic diagram of the curved display device provided in the embodiment of the present invention, Figure 32 is Figure 31 a cross-sectional view along the B1 - B2 direction, as Figure 31 andFigure 32 As shown in the figure, the curved surface display device includes the above-mentioned curved surface display panel 100 and the middle frame 200. Among them, the curved surface display panel 100 is located in the accommodation space formed by the middle frame 200. The curved surface display device can be any display device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an e-reader, or a television.

[0181] Based on the same inventive concept, an embodiment of the present invention provides an electronic device. Figure 33 As a schematic structural diagram of the electronic device provided by the embodiment of the present invention, the electronic device includes the above-mentioned curved surface display panel 100 and an image processor 300 (Graphics Processing Unit, GPU). Among them, the image processor 300 is used to process the images displayed on the curved surface display panel 100. The electronic device can be any device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an e-reader, or a television.

[0182] Based on the same inventive concept, an embodiment of the present invention provides a manufacturing method for a curved surface display panel. The manufacturing method is used to manufacture the above-mentioned curved surface display panel. In combination with Figures 3 - 6 , the curved surface display panel includes a display area 1. The display area 1 includes a flat display area 2 and a curved surface display area 3. The curved surface display area 3 includes a first curved surface area 10 and a second curved surface area 11. The bending curvature of the first curved surface area 10 is smaller than the bending curvature of the second curved surface area 11. Figure 34 As a flowchart of the manufacturing method provided by the embodiment of the present invention, as Figure 34 shown, the manufacturing method includes:

[0183] Step S1: Form an array layer 5 on a substrate 4. A plurality of pixels 6 are provided in the array layer 5. Each pixel 6 includes a plurality of sub-pixels 7. Among them, the specific film layer structure of the array layer 5 has been described in detail in the above embodiment and will not be elaborated here.

[0184] Step S2: Form a grating layer 8 on the side of the array layer 5 facing away from the substrate 4. The grating layer 8 includes a grating structure 9 located in the curved surface display area 3. The grating structure 9 includes a plurality of first grating units 91. One first grating unit 91 covers a sub-pixel 71 of a first color. The sub-pixel 71 of the first color refers to a sub-pixel used to generate a first color light signal. The first color is any one of the colors of the light signals generated by the plurality of sub-pixels 7 in the array layer. The first color light signal generated by the sub-pixel 71 of the first color is emitted through the first grating unit 91.

[0185] Using the manufacturing method provided by the embodiments of the present invention, when forming the grating layer 8, for the first grating unit 91 covering the sub-pixel 71 of the first color, by making the grating period of the first grating unit 91 in the second curved surface area 11 smaller than the grating period of the first grating unit 91 in the first curved surface area 10, the diffraction angles of the diffracted light in the first curved surface area 10 and the second curved surface area 11 can be adjusted to different degrees, so that the diffracted light in the first curved surface area 10 and the second curved surface area 11 both tend to be emitted in the positive viewing direction PP, effectively improving the consistency of the light-emitting brightness of different regions in the curved display area 3 at the positive viewing angle, and further improving the consistency of the light-emitting brightness between the curved display area 3 and the flat display area 2 at the positive viewing angle, significantly improving the color shift phenomenon in the curved display area 3, and optimizing the display performance.

[0186] Further, in combination with Figure 8 , the process of forming the grating layer 8 includes: forming a plurality of microstructures 28 and a plurality of slits 29. The plurality of microstructures 28 are arranged at intervals in the curved display area 3. The slit 29 is located between two adjacent microstructures 28. The width of the slit 29 is on the order of dozens of micrometers and is used to achieve diffraction. The microstructure 28 can be a light-transmitting prism and is used to refract and / or scatter the light emitted by the sub-pixel 7. At this time, the grating structure 9 can not only use the slit 29 to achieve diffraction, but also further refract and / or scatter the part of the light when part of the light is incident on the microstructure 28, so as to adjust the propagation directions of more incident light and improve the light-emitting brightness of the curved display area 3 at the positive viewing angle to a greater extent.

[0187] In one embodiment, in combination with Figures 18 - 21 , after forming the array layer 5 on the substrate 4, the manufacturing method further includes: forming a coating layer 31 on the side of the array layer 5 facing away from the substrate 4 to encapsulate the array layer 5, where the encapsulation layer 31 may include a plurality of alternately stacked organic encapsulation layers and inorganic encapsulation layers; forming a functional layer 32 for realizing functions such as touch control and polarization on the side of the encapsulation layer 31 facing away from the substrate 4; forming an adhesive layer 33 on the side of the functional layer 32 facing away from the substrate 4; attaching a cover plate 34 on the side of the adhesive layer 33 facing away from the substrate 4; and forming a protective film 35 on the side of the cover plate 34 facing away from the substrate 4.

[0188] Among them, please refer to Figure 18 again. The functional layer 32 includes a grating structure 9. At this time, the functional layer 32 is reused as the grating layer 8, and the functional layer 32 has functions such as touch control, polarization, and diffraction of light. Or, please refer to Figure 19 again. The adhesive layer 33 has a grating structure 9. At this time, the adhesive layer 33 is reused as the grating layer 8, and the adhesive layer 33 has functions such as adhesion and diffraction of light. Or, please refer to Figure 20, the cover plate 34 includes a grating structure 9. At this time, the cover plate 34 is reused as the grating layer 8, and the cover plate 34 has the function of diffracting light. Or, please refer to again Figure 21 , the protective film 35 includes a grating structure 9. At this time, the protective film 35 is reused as the grating layer 8, and the protective film 35 has the functions of protection and light diffraction. By adopting this manufacturing method, the grating layer 8 can be formed by reusing the original film layer in the curved display panel, without the need to additionally add a film layer. Therefore, the grating layer 8 does not need to additionally occupy the film layer space, which is more conducive to the thinning design of the curved display panel.

[0189] Furthermore, in combination with Figure 23 , when the functional layer 32 includes a grating structure 9, the process of forming the functional layer 32 includes: forming a touch electrode layer 38 on the side of the encapsulation layer 31 facing away from the substrate 4; forming an insulating layer 39 on the side of the touch electrode layer 38 facing away from the substrate 4, etching the insulating layer 39, and forming a plurality of microstructures 28 in the curved display area 3; and disposing a polarizer 37 on the side of the insulating layer 39 facing away from the substrate 4. That is to say, in this manufacturing method, the grating layer 8 and the insulating layer 39 in the functional layer 32 are reused.

[0190] During the manufacturing process of the curved display panel, the array layer 5, the encapsulation layer 31, and the touch layer 36 are formed by using semiconductor processes on the same production line. After forming the touch layer 36, structures such as the polarizer 37, the adhesive layer 33, the cover plate 34, and the protective film 35 are disposed on the side of the touch layer 36 facing away from the array layer 5. When the grating layer 8 is reused as the insulating layer 39 in the functional layer 32, there is no need to adjust the original process flow of the encapsulation layer 31 and the touch electrode layer 38, and only a photolithography process needs to be added in the last process of forming the insulating layer 39, and the process complexity is relatively low.

[0191] Or, when the grating layer 8 is reused as the cover plate 34, in combination with Figure 20 , Figure 35 is a schematic diagram of the manufacturing process of the cover plate when the grating layer and the cover plate are reused according to an embodiment of the present invention. As Figure 35 shown, the process of forming the cover plate 34 includes: cutting out slits 29 on the side of the cover plate 34 facing away from the substrate 4 through a laser process, such as a laser close machining process. At this time, the slits 29 and the microstructures 28 are located on the side of the cover plate 34 away from the substrate 4; or, Figure 36 is another schematic diagram of the manufacturing process of the cover plate when the grating layer and the cover plate are reused according to an embodiment of the present invention. As Figure 36As shown, the process of forming the cover plate 34 includes: using a hot bending process to form a microstructure 28 on the side of the cover plate 34 facing the base substrate 4. Specifically, a recessed groove complementary to the microstructure 28 is formed in the area corresponding to the curved display area 3 in the 3D hot bending mold 41 by a laser process or the like. During the hot bending process, the microstructure 28 is formed on the inner side of the cover plate 34 by using the 3D hot bending mold 41. At this time, the slit 29 and the microstructure 28 are located on the side of the cover plate 34 close to the base substrate 4. When the slit 29 and the microstructure 28 are located on different sides of the cover plate 34, the slit 29 and the microstructure 28 are formed in the cover plate 34 by selecting different manufacturing processes, so as to improve the feasibility of the process and simplify the process difficulty.

[0192] In one embodiment, in combination Figure 25 and Figure 26 After forming the array layer 5 on the base substrate 4, the manufacturing method further includes: forming an encapsulation layer 31 on the side of the array layer 5 facing away from the base substrate 4 to cover the array layer 5 and encapsulate the array layer 5, wherein the encapsulation layer 31 may include a plurality of organic encapsulation layers and stepless encapsulation layers alternately stacked; forming a functional layer 32 for realizing touch control, polarization and other functions on the side of the encapsulation layer 31 facing away from the base substrate 4; forming an adhesive layer 33 on the side of the functional layer 32 facing away from the base substrate 4; attaching a cover plate 34 on the side of the adhesive layer 33 facing away from the base substrate 4; and forming a protective film 35 on the side of the cover plate 34 facing away from the base substrate 4. Please refer again to Figure 25 , the grating layer 8 is located between the encapsulation layer 31 and the glue layer 33, or, please refer to Figure 26 , the grating layer 8 is located between the glue layer 33 and the cover plate 34. With this manufacturing method, the grating layer 8 is an independently arranged film layer, and is not reused with the original film layer in the curved display panel, so there is no need to adjust the process of the original film layer, thereby reducing the manufacturing complexity of the curved display panel.

[0193] Furthermore, when the grating layer 8 is an independently arranged film layer, Figure 30 , Figure 37 The process flow chart of manufacturing the grating layer provided in the embodiment of the present invention is as follows: Figure 38 for Figure 37 The corresponding structural flow chart is as follows: Figure 37 and Figure 38 As shown, the process of forming the grating layer 8 includes:

[0194] Step K1: Laminating the substrate 40 with the transfer mold 42 , wherein the transfer mold 42 includes a groove 43 for forming the microstructure 28 , and the groove 43 is located in a region of the transfer mold 42 corresponding to the curved display region 3 .

[0195] Step K2: Filling the gap between the substrate 40 and the transfer mold 42 with a photosensitive adhesive material 44 .

[0196] Step K3: Irradiate the photosensitive adhesive material 44 with an ultraviolet lamp to cure the photosensitive adhesive material 44.

[0197] Step K4: Remove the transfer mold 42.

[0198] Specifically, in different curved display panels, if the shapes and heights of the microstructures 28 in the grating layer 8 are different, only the grooves 43 of the transfer mold 42 need to be adjusted adaptively, without affecting the manufacturing process flow, which improves the mass producibility.

[0199] It should be noted that the transfer mold 42 may be provided with an area for accommodating the photosensitive adhesive material 44 at the position corresponding to the flat display area 2, or may not be provided with an area for accommodating the photosensitive adhesive material 44. Depending on the structure of the transfer mold 42, please refer to Figure 38 again. The area where the flat display area 2 is located may also be filled with the photosensitive adhesive material 44, but the photosensitive adhesive material 44 in this area has a flat surface structure and does not have the slit 29 either. Or, Figure 39 For Figure 37 another corresponding structural flowchart, as Figure 39 shown, the area where the flat display area 2 is located may not be filled with the photosensitive adhesive material 44 either.

[0200] Further, after step K4, the process of forming the grating layer 8 may further include:

[0201] Step K5: Attach a first adhesive layer 45 and a grating protective film 46 to the side of the substrate 40 facing away from the microstructures 28, and / or attach a second adhesive layer 47 to the side of the microstructures 28 facing away from the substrate 40; wherein, the first adhesive layer 45 and the second adhesive layer 47 may be transparent optical adhesives to improve the adhesion between the grating layer 8 and other film layers in the curved display panel, and to prevent the position of the grating layer 8 from shifting under the action of external force factors. The grating protective film 46 is used to protect the formed grating layer 8 from damage, and it can be removed when the grating layer 8 is placed in the curved display panel later.

[0202] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

[0203] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A curved display panel, characterized in that, Comprising: A display area, which includes a flat display area and a curved display area; A substrate, on one side of the substrate facing the light-emitting direction of the curved display panel, an array layer is provided, and a plurality of pixels are provided in the array layer, and each pixel includes a plurality of sub-pixels; A grating layer, the grating layer is located on the side of the array layer facing away from the substrate, and the grating layer includes a grating structure located in the curved display area; Wherein, the grating structure includes a plurality of first grating units, and one first grating unit covers a sub-pixel of a first color. The sub-pixel of the first color refers to a sub-pixel for generating a light signal of the first color. The first color is any one of the colors of the light signals generated by the plurality of sub-pixels in the array layer, and the light signal of the first color generated by the sub-pixel of the first color is emitted through the first grating unit; The curved display area includes a first curved area and a second curved area. The bending curvature of the first curved area is less than the bending curvature of the second curved area. The grating period of the first grating unit located in the first curved area is greater than the grating period of the first grating unit located in the second curved area.

2. The curved display panel according to claim 1, characterized in that Along the extending direction from the inner edge to the outer edge of the curved display area, the bending curvature of the curved display area increases, and the grating periods of the plurality of first grating units in the grating structure decrease; Wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far from the flat display area.

3. The curved display panel according to claim 2, characterized in that The grating periods of the plurality of first grating units in the grating structure decrease linearly.

4. The curved display panel according to claim 2 or 3, characterized in that, Further comprising: The diffraction efficiencies of the plurality of first grating units in the grating structure increase.

5. The curved display panel according to claim 1, characterized in that Each pixel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, then the grating structure includes a red grating unit, a green grating unit and a blue grating unit. Wherein, the red grating unit covers the red sub-pixel, and the red light signal generated by the red sub-pixel is emitted through the red grating unit. The green grating unit covers the green sub-pixel, and the green light signal generated by the green sub-pixel is emitted through the green grating unit. The blue grating unit covers the blue sub-pixel, and the blue light signal generated by the blue sub-pixel is emitted through the blue grating unit; For the same pixel, the grating period of the red grating unit covering the red sub-pixel is Pr, the grating period of the green grating unit covering the green sub-pixel is Pg, and the grating period of the blue grating unit covering the blue sub-pixel is Pb, and Pr > Pg > Pb.

6. The curved display panel according to claim 1, characterized in that The grating structure includes a plurality of microstructures and a plurality of slits. The plurality of microstructures are arranged at intervals within the curved display area. The slits are located between two adjacent microstructures. The microstructures are configured to refract and / or scatter the light emitted by the sub-pixels.

7. The curved display panel according to claim 6, wherein along the extending direction from the inner edge to the outer edge of the curved display area, the bending curvature of the curved display area increases, and the light scattering degree and / or the light refraction degree of the plurality of microstructures in the grating structure increase; wherein, the inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far from the flat display area.

8. The curved display panel according to claim 7, wherein along the extending direction from the inner edge to the outer edge of the curved display area, the heights of the plurality of microstructures in the respective cutting plane directions perpendicular to the substrate increase. The cutting plane of the substrate is the cutting plane at the position corresponding to the center point of the microstructure in the substrate.

9. The curved display panel according to claim 6, wherein the microstructure has a first cross-section, the first cross-section is parallel to the cutting plane of the substrate, the cutting plane of the substrate is the cutting plane at the position corresponding to the center point of the microstructure in the substrate, and the shape of the first cross-section is rectangular, triangular, elliptical, circular or rhombic.

10. The curved display panel according to claim 6, wherein the microstructure is a strip structure. In the curved display area, the plurality of microstructures are arranged along a first direction, and each microstructure extends along a second direction. The first direction is the extending direction from the inner edge to the outer edge of the curved display area. The inner edge of the curved display area is close to the flat display area, and the outer edge of the curved display area is far from the flat display area. The second direction intersects with the first direction.

11. The curved display panel according to claim 6, characterized in that, The curved display panel further includes a stacked encapsulation layer, a functional layer, an adhesive layer, a cover plate and a protective film: The encapsulation layer is configured to encapsulate the array layer; The functional layer is located on the side of the encapsulation layer facing away from the substrate; The adhesive layer is located on the side of the functional layer facing away from the substrate; The cover plate is located on the side of the adhesive layer facing away from the substrate; The protective film is located on the side of the cover plate facing away from the substrate; wherein, the functional layer includes the grating structure; or, the adhesive layer includes the grating structure; or, the cover plate includes the grating structure; or, the protective film includes the grating structure.

12. The curved display panel according to claim 11, wherein The functional layer includes a stacked touch layer and a polarizer; The touch layer is disposed on the side of the encapsulation layer facing away from the substrate. The touch layer includes a touch electrode layer and an insulating layer. The insulating layer is located on the side of the touch electrode layer facing away from the substrate; The polarizer is disposed on the side of the insulating layer facing away from the substrate; wherein, the insulating layer includes the grating structure.

13. The curved display panel according to claim 6, wherein The curved display panel further includes a stacked encapsulation layer, a functional layer, an adhesive layer, a cover plate, and a protective film; The encapsulation layer is used to encapsulate the array layer; The functional layer is located on a side of the encapsulation layer facing away from the substrate; The adhesive layer is located on a side of the functional layer facing away from the substrate; The cover plate is located on a side of the adhesive layer facing away from the substrate; The protective film is located on a side of the cover plate facing away from the substrate; The grating layer is located between the encapsulation layer and the adhesive layer, or the grating layer is located between the adhesive layer and the cover plate.

14. The curved display panel according to claim 13, wherein, The functional layer includes a stacked touch layer and a polarizer; The touch layer is disposed on a side of the encapsulation layer facing away from the substrate. The touch layer includes a touch electrode layer and an insulating layer, and the insulating layer is located on a side of the touch electrode layer facing away from the substrate; The polarizer is disposed on a side of the insulating layer facing away from the substrate; The grating layer is located between the touch layer and the polarizer, or the grating layer is located between the polarizer and the adhesive layer.

15. The curved display panel according to claim 6, wherein The grating layer further includes a substrate for carrying the microstructures, and the microstructures are formed of a photosensitive adhesive material.

16. A curved surface display device, characterized in that, It includes a middle frame and the curved display panel according to any one of claims 1 to 15, wherein the curved display panel is located in a receiving cavity formed by the middle frame.

17. An electronic device, characterized in that, It includes the curved display panel according to any one of claims 1 to 15 and an image processor, wherein the image processor is used to process an image displayed on the curved display panel.

18. A method for manufacturing a curved display panel, characterized in that, The curved display panel includes a display area, the display area includes a flat display area and a curved display area, the curved display area includes a first curved area and a second curved area, and a bending curvature of the first curved area is less than a bending curvature of the second curved area; The manufacturing method includes: Forming an array layer on a substrate, wherein a plurality of pixels are provided in the array layer, and each pixel includes a plurality of sub-pixels; Forming a grating layer on a side of the array layer facing away from the substrate, the grating layer includes a grating structure located in the curved display area, wherein the grating structure includes a plurality of first grating units, one first grating unit covers a sub-pixel of a first color, the sub-pixel of the first color refers to a sub-pixel for generating a first color light signal, the first color is any one of the colors of the light signals generated by the plurality of sub-pixels in the array layer, and the first color light signal generated by the sub-pixel of the first color is emitted through the first grating unit; a grating period of the first grating unit located in the first curved area is greater than a grating period of the first grating unit located in the second curved area.

19. The manufacturing method according to claim 18, wherein The process of forming the grating layer includes: Forming a plurality of microstructures and a plurality of slits, the plurality of microstructures are spaced apart in the curved display area, the slits are located between two adjacent microstructures, and the microstructures are used to refract and / or scatter the light emitted by the sub-pixels.

20. The manufacturing method according to claim 19, wherein After forming the array layer on the substrate, the manufacturing method further includes: A packaging layer is formed on the side of the array layer facing away from the substrate; A functional layer is formed on the side of the packaging layer facing away from the substrate; An adhesive layer is formed on the side of the functional layer facing away from the substrate; A cover plate is attached to the side of the adhesive layer facing away from the substrate; A protective film is formed on the side of the cover plate facing away from the substrate; Wherein, the functional layer includes the grating structure; or, the adhesive layer includes the grating structure; or, the cover plate includes the grating structure; or, the protective film includes the grating structure.

21. The manufacturing method according to claim 20, characterized in that, When the functional layer includes the grating, the process of forming the functional layer includes: A touch electrode layer is formed on the side of the packaging layer facing away from the substrate; An insulating layer is formed on the side of the touch electrode layer facing away from the substrate, and the insulating layer is etched to form a plurality of the microstructures in the curved display area; A polarizer is disposed on the side of the insulating layer facing away from the substrate.

22. The manufacturing method according to claim 20, characterized in that, When the cover plate includes the grating structure, the process of forming the cover plate includes: The slit is cut out on the side of the cover plate facing away from the substrate by a laser process, or the microstructures are formed on the side of the cover plate facing the substrate by a thermoforming process.

23. The manufacturing method according to claim 18, characterized in that, After the array layer is formed on the substrate, the manufacturing method further includes: A packaging layer is formed on the side of the array layer facing away from the substrate; A functional layer is formed on the side of the packaging layer facing away from the substrate; An adhesive layer is formed on the side of the functional layer facing away from the substrate; A cover plate is attached to the side of the adhesive layer facing away from the substrate; A protective film is formed on the side of the cover plate facing away from the substrate; Wherein, the grating layer is located between the packaging layer and the adhesive layer, or the grating layer is located between the adhesive layer and the cover plate.

24. The manufacturing method according to claim 19, wherein, The process of forming the grating layer includes: The substrate is bonded to the transfer mold, and the transfer mold includes a groove for forming the microstructures; A photosensitive adhesive material is filled in the gap between the substrate and the transfer mold; The photosensitive adhesive material is cured; The transfer mold is removed.

Images