CN114335072A

CN114335072A - Curved surface display panel and manufacturing method thereof, curved surface display device and electronic equipment

Info

Publication number: CN114335072A
Application number: CN202011069716.9A
Authority: CN
Inventors: 胡治晋; 许小杰; 袁琴; 谭纪风; 张译文; 唐涛
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-04-12

Abstract

The embodiment of the application provides a curved surface display panel, a manufacturing method thereof and a curved surface display device, relates to the technical field of display, and aims to improve the consistency of the light-emitting brightness of a curved surface display area and a flat surface display area under a normal viewing angle and improve the color cast of the curved surface display area. The curved surface display panel includes: the display area comprises a plane display area and a curved surface display area; the array substrate comprises a substrate base plate and a substrate, wherein the substrate base plate is provided with an array layer, the array layer is provided with pixels, and the pixels comprise sub-pixels; the grating layer is positioned on one side of the array layer, which is back to the substrate base plate, and comprises a grating structure positioned in the curved surface display area; the grating structure comprises first grating units, wherein one first grating unit covers one first color sub-pixel, and a first color light signal generated by the first color sub-pixel is emitted out through the first grating unit; the curved surface display area comprises a first curved surface area and a second curved surface area, the bending curvature of the first curved surface area is smaller than that of the second curved surface area, and the grating period of the first grating unit of the first curved surface area is larger than that of the first grating unit of the second curved surface area.

Description

Curved surface display panel and manufacturing method thereof, curved surface display device and electronic equipment

Technical Field

The invention relates to the technical field of display, in particular to a curved surface display panel, a manufacturing method of the curved surface display panel, a curved surface display device and electronic equipment.

Background

With the continuous development of display technologies, the application forms of display panels are also gradually increased, wherein curved display panels have become mainstream application forms in display devices such as mobile phones at present due to providing immersive and frameless visual experiences for users, and particularly, with the improvement of a 3D laminating process, a curved display area in a curved display panel can be bent by approximately 90 degrees, so that the curved display panel forms a 'waterfall screen' or a 'circular screen', thereby bringing more extreme use experiences to users.

Fig. 1 is a schematic structural diagram of a curved display panel in the prior art, and as shown in fig. 1, the curved display panel includes a flat display area 1 ' and a curved display area 2 ', where the flat display area 1 ' refers to a display area that is not curved, and when a user views or operates a display screen, a viewing angle of the user is generally perpendicular to a plane where the flat display area 1 ' is located, that is, in a front viewing angle direction PP '. Because the curved surface display area 2 'is curved compared with the flat surface display area 1', light rays emitted by sub-pixels 3 'in the curved surface display area 2' can deviate from the normal viewing angle direction PP 'to a greater extent and be obliquely emitted along with the increase of the degree of curvature of the curved surface display area 2', so that the light-emitting brightness in the normal viewing angle direction PP 'is reduced, a larger brightness difference exists between the curved surface display area 2' and the flat surface display area 1 'in the normal viewing angle direction PP', and further the color shift phenomenon occurs in the curved surface display area 2 ', for example, when a picture with white background color is displayed, the curved surface display area 2' can show a more obvious 'bluing' phenomenon. Particularly, in the case of the waterfall screen or the circular screen, the color cast phenomenon of the curved display area 2' is particularly serious, which seriously affects the user experience.

Therefore, how to effectively improve the color cast phenomenon in the curved surface display area 2' becomes a technical problem to be solved at present.

Disclosure of Invention

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 luminance of the curved display area and the luminance of the curved display area at a front viewing angle, and effectively improve the color shift phenomenon of the curved display area.

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

the display area comprises a plane display area and a curved surface display area;

the curved surface display panel comprises a substrate base plate, an array layer and a plurality of pixels, wherein the side, facing the light emergent direction of the curved surface display panel, of the substrate base plate is provided with the array layer, the array layer is internally provided with the plurality of pixels, and each pixel comprises a plurality of sub-pixels;

the grating layer is positioned on one side, back to the substrate, of the array layer and comprises a grating structure positioned in the curved surface display area;

the grating structure comprises a plurality of first grating units, one first grating unit covers one sub-pixel of a first color, the sub-pixel of the first color is used for generating a light signal of the first color, the first color is any one of 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 surface display area comprises a first curved surface area and a second curved surface area, the bending curvature of the first curved surface area is smaller than that of the second curved surface area, and the grating period of the first grating unit located in the first curved surface area is larger than that of the first grating unit located in the second curved surface area.

In some embodiments, the curved display region has an increasing curvature in a direction extending from an inner edge of the curved display region to an outer edge of the curved display region, and the grating period of the plurality of first grating units in the grating structure decreases;

the inner edge of the curved surface display area is close to the plane display area, and the outer edge of the curved surface display area is far away from the plane display area.

Further, the grating period of the first grating units in the grating structure decreases linearly.

In some embodiments, the diffraction efficiency of a plurality of the first grating elements in the grating structure increases.

In some embodiments, each of the pixels includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and 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, a 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, a 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 a 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, the grating period of the blue grating unit covering the blue sub-pixel is Pb, and Pr is more than Pg and is more than Pb.

In some embodiments, the grating structure includes 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 for refracting and/or scattering light emitted from the sub-pixels.

Further, along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, the bending curvature of the curved display area is increased, and the light scattering degree and/or the light refraction degree of the plurality of microstructures in the grating structure are increased;

In some embodiments, along an extending direction from an inner edge of the curved display region to an outer edge of the curved display region, heights of the plurality of microstructures are increased in a direction perpendicular to a tangent plane of the substrate base plate, where the tangent plane of the substrate base plate is a tangent plane of the substrate base plate at a position corresponding to a center point of the microstructure.

In some embodiments, the microstructure has a first cross section, the first cross section is parallel to a tangent plane of the substrate base plate, the tangent plane of the substrate base plate is a tangent plane of the substrate base plate at a position corresponding to a center point of the microstructure, and the first cross section has a shape of a rectangle, a triangle, an ellipse, a circle or a diamond.

In some embodiments, the microstructures are stripe structures, in the curved display area, a plurality of the microstructures are arranged along a first direction, and each of the microstructures extends along a second direction, the first direction is an extending direction from an inner edge of the curved display area to an 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 away from the flat display area, and the second direction intersects with the first direction.

In some embodiments, the curved display panel further comprises:

the curved surface display panel further comprises a packaging layer, a functional layer, a glue layer, a cover plate and a protective film which are stacked:

the packaging layer is used for packaging the array layer;

the functional layer is positioned on one side of the packaging layer, which faces away from the substrate base plate;

the adhesive layer is positioned on one side of the functional layer, which faces away from the substrate base plate;

the cover plate is positioned on one side of the adhesive layer, which is back to the substrate base plate;

the protective film is positioned on one side of the cover plate, which is back to the substrate base plate;

wherein the functional layer comprises the grating structure;

or, the glue layer comprises the grating structure;

or, the cover plate comprises the grating structure;

or, the protective film comprises the grating structure.

Further, the functional layer comprises a laminated touch layer and a polarizer;

the touch layer is arranged on one side, back to the substrate base plate, of the packaging layer and comprises a touch electrode layer and an insulating layer, and the insulating layer is located on one side, back to the substrate base plate, of the touch electrode layer;

the polaroid is arranged on one side of the insulating layer, which is opposite to the substrate base plate;

wherein the insulating layer includes the grating structure.

In some embodiments, the curved display panel further comprises a stacked encapsulation layer, a functional layer, a glue layer, a cover plate and a protective film;

the packaging layer is used for packaging the array layer;

the grating layer is located between the packaging layer and the glue layer, or the grating layer is located between the glue layer and the cover plate.

the grating layer is located between the touch layer and the polaroid, or the grating layer is located between the polaroid and the adhesive layer.

In some embodiments, the grating layer further comprises a substrate for supporting the microstructures, the microstructures being formed from a photosensitive glue material.

Based on the same inventive concept, the embodiment of the present application further provides a curved surface display device, which includes a middle frame and the curved surface display panel, wherein the curved surface display panel is located in an accommodating cavity formed by the middle frame.

Based on the same inventive concept, embodiments of the present application further provide an electronic device, which includes the curved display panel and an image processor, wherein the image processor is configured to process an image displayed on the curved display panel.

Based on the same inventive concept, the embodiment of the present application further provides a manufacturing method of the curved display panel, where the curved display panel includes a display area, the display area includes a planar 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 smaller than a bending curvature of the second curved area;

the manufacturing method comprises the following steps:

forming an array layer on a substrate, wherein a plurality of pixels are arranged in the array layer, and each pixel comprises a plurality of sub-pixels;

forming a grating layer on a side of the array layer opposite to the substrate, where the grating layer includes a grating structure located in the curved display area, where the grating structure includes a plurality of first grating units, one of the first grating units covers a first-color sub-pixel, the first-color sub-pixel is a sub-pixel for generating a first-color light signal, the first color is any one of colors of light signals generated by a plurality of sub-pixels in the array layer, and the first-color light signal generated by the first-color sub-pixel is emitted through the first grating unit; the grating period of the first grating unit located in the first curved surface region is larger than the grating period of the first grating unit located in the second curved surface region.

In some embodiments, forming the grating layer comprises:

and forming a plurality of microstructures and a plurality of slits, wherein the microstructures are arranged in the curved surface display area at intervals, the slits are positioned between two adjacent microstructures, and the microstructures are used for refracting and/or scattering light emitted by the sub-pixels.

In some embodiments, after forming the array layer on the substrate base plate, the fabrication method further comprises:

forming an encapsulation layer on one side of the array layer, which faces away from the substrate base plate;

forming a functional layer on one side of the packaging layer, which faces away from the substrate base plate;

forming a glue layer on one side of the functional layer, which faces away from the substrate base plate;

attaching a cover plate to one side of the adhesive layer, which is opposite to the substrate base plate;

forming a protective film on one side of the cover plate, which faces away from the substrate base plate;

wherein the functional layer comprises the grating structure; or, the glue layer comprises the grating structure; or, the cover plate comprises the grating structure; or, the protective film comprises the grating structure.

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

forming a touch electrode layer on one side of the packaging layer, which faces away from the substrate base plate;

forming an insulating layer on one side, back to the substrate, of the touch electrode layer, etching the insulating layer, and forming a plurality of microstructures in the curved surface display area;

and arranging a polaroid on one side of the insulating layer, which is opposite to the substrate base plate.

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

and cutting the slit on one side of the cover plate, which is back to the substrate base plate, through a laser process, or forming the microstructure on one side of the cover plate, which is facing to the substrate base plate, through a hot bending forming process.

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.

Further, the process of forming the grating layer includes:

attaching a substrate to a transfer mold, wherein the transfer mold comprises a groove for forming the microstructure;

filling a photosensitive adhesive material in a gap between the base material and the transfer printing mold;

curing the photosensitive adhesive material;

and removing the transfer printing mold.

The curved surface display panel, the manufacturing method thereof, the curved surface display device and the electronic equipment have the following beneficial effects:

in the technical scheme provided by the embodiment of the invention, the grating layer is arranged in the curved surface display area, when light rays emitted by sub-pixels in the curved surface display area are incident to the grating layer, diffraction can be generated in the grating structure, and the propagation direction of the diffracted light rays is changed, so that part of the light rays are emitted in the direction close to the normal viewing angle. Go toIn the first curved surface area with smaller bending degree, for the light emitted by the sub-pixels in the area, the diffracted light can be emitted close to the normal viewing angle direction only by deviating a small angle from the normal, that is, in the area, if the light emitting brightness under the normal viewing angle is to be improved, the diffracted light only needs to be controlled to have a small diffraction angle; in the second curved surface region with a large curvature, for the light emitted by the sub-pixels in the region, the diffracted light needs to deviate from the normal by a large angle to be emitted toward the normal viewing angle. According to the grating formula

Where α is an incident angle of incident light to the grating structure, β is a diffraction angle of diffracted light after diffraction, n1 is a refractive index of a medium in which the incident light is present, n2 is a refractive index of a medium in which the diffracted light is present, λ is a wavelength of the incident light to the grating structure, P is a grating period, m is a diffraction order, m is 0, ± 1, ± 2, …, and when m is a negative value, the diffracted light deviates from one side of the normal line, sin β is a positive value, when m is a positive value, the diffracted light deviates from the other side of the normal line, sin β is a negative value, it is known that the diffraction angle β in the same order of diffraction is inversely proportional to the grating period P, and the smaller the grating period P, the larger the diffraction angle β of a certain non-0 order of diffraction is, and therefore, in a first grating unit covering a sub-pixel of a first color, by making the grating period P2 of the first grating unit in a second curved surface region smaller than the grating period of the first grating unit in the first curved surface region, the diffraction angle of the diffracted light in the first curved surface region can be adjusted to different degrees by making the diffracted light in the first curved surface region have a smaller diffraction angle and making the diffracted light in the second curved surface region have a larger diffraction angle beta 2, so that the diffracted light in the first curved surface region and the second curved surface region can be emitted in the direction of the normal viewing angle.

Therefore, by adopting the technical scheme provided by the embodiment of the invention, in the first grating unit covering the sub-pixel of the first color, the diffraction angles of the diffracted lights in the areas with different bending degrees can be adjusted in different degrees 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, so that the diffracted lights in each area of the curved surface display area are emitted in the direction of the normal viewing angle, the consistency of the light brightness of different areas of the curved surface display area under the normal viewing angle is effectively improved, the consistency of the light brightness of the curved surface display area and the plane display area under the normal viewing angle is further improved, the color cast phenomenon of the curved surface display area is obviously improved, and the display performance is optimized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.

FIG. 1 is a schematic diagram of a curved display panel in the prior art;

FIG. 2 is a schematic diagram of another structure of a curved display panel in the prior art;

fig. 3 is a schematic structural diagram of a curved display panel according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view taken along line A1-A2 of FIG. 3;

fig. 5 is a schematic structural diagram of a first grating unit according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a grating period of the first grating unit in the first curved surface region and the second curved surface region according to the embodiment of the present invention;

fig. 7 is a schematic diagram of grating periods of first grating units corresponding to sub-pixels of different colors in the same pixel according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a grating layer according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating simulation of luminance of light emitted from a curved display area at different viewing angles when no grating layer is disposed according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating simulation of the brightness of light emitted from the curved surface display area at different viewing angles after the grating layer is disposed according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a grating layer according to an embodiment of the present invention;

FIG. 12 is a schematic view of refraction of light rays in microstructures of different heights provided by an embodiment of the present invention;

FIG. 13 is a schematic view of a first cross-section of a microstructure provided in an embodiment of the invention;

FIG. 14 is another schematic view of a first cross-section of a microstructure provided in an embodiment of the invention;

FIG. 15 is a schematic view of a first cross-section of a microstructure according to an embodiment of the present invention;

FIG. 16 is a schematic view of a first cross-section of a microstructure provided in an embodiment of the invention;

fig. 17 is a schematic structural diagram of a microstructure provided in an embodiment of the present invention;

fig. 18 is a schematic diagram of a functional layer multiplexed as a grating layer according to an embodiment of the present invention;

fig. 19 is a schematic diagram illustrating a glue layer multiplexed into a grating layer according to an embodiment of the present invention;

fig. 20 is a schematic diagram illustrating a cover plate multiplexed as a grating layer according to an embodiment of the present invention;

fig. 21 is a schematic diagram illustrating a case where the protective film provided by the embodiment of the present invention is reused as a grating layer;

fig. 22 is another schematic diagram illustrating the case where the protective film provided by the embodiment of the present invention is reused as a grating layer;

fig. 23 is another schematic diagram of a functional layer multiplexed as a grating layer according to an embodiment of the present invention;

fig. 24 is a further schematic diagram of a functional layer multiplexed as a grating layer according to an embodiment of the present invention;

fig. 25 is a schematic view illustrating a grating layer located between an encapsulation layer and an adhesive layer according to an embodiment of the present invention;

fig. 26 is a schematic view illustrating a grating layer located between a glue layer and a cover plate according to an embodiment of the present invention;

fig. 27 is another schematic view of a grating layer between a glue layer and a cover plate according to an embodiment of the present invention;

fig. 28 is another schematic view of a grating layer disposed on an encapsulation layer and an adhesive layer according to an embodiment of the present invention;

fig. 29 is a further schematic view of a grating layer located on an encapsulation layer and an adhesive layer according to an embodiment of the present invention;

fig. 30 is a schematic structural diagram of a grating layer according to an embodiment of the present invention;

fig. 31 is a schematic structural diagram of a curved display device according to an embodiment of the present invention.

FIG. 32 is a cross-sectional view taken along line B1-B2 of FIG. 31;

fig. 33 is a schematic structural diagram of an electronic device according to an embodiment of the invention;

FIG. 34 is a flow chart of a method of fabrication according to an embodiment of the present invention;

fig. 35 is a schematic view of a manufacturing process of the cover plate when the cover plate is reused as the grating layer according to the embodiment of the present invention;

fig. 36 is a schematic view illustrating another manufacturing process of the cover plate when the cover plate is reused as the grating layer according to the embodiment of the present invention;

FIG. 37 is a flowchart illustrating a grating layer fabrication process according to an embodiment of the present invention;

FIG. 38 is a flow chart of a structure corresponding to FIG. 37;

fig. 39 is a flow chart of another structure corresponding to fig. 37.

Detailed Description

In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Before explaining the technical scheme of the invention, the invention specifically explains the problems in the prior art:

in the prior art, in order to improve the color shift phenomenon of the curved display area of the curved display panel, the arrangement of the light-emitting layer in the curved display area is usually adjusted, and fig. 2 is another schematic structural diagram of the curved display panel in the prior art, as shown in fig. 2, the curved display panel includes a flat display area 1 "and a curved display area 2", and in the curved display area 2 ", the light-emitting layer 3" in the organic light-emitting diode is obliquely arranged relative 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 the light-emitting surface 5", and the rest of the light is emitted in other directions, and after the light-emitting layer 3 "is disposed obliquely with respect to the substrate 4", the light-emitting surface 5 "of the light-emitting layer 3" is also tilted with respect to the substrate 4 ", so that the transmission direction of the most of the light emitted by the light-emitting layer 3" in the direction perpendicular to the light-emitting surface 5 "is also tilted in the direction PP" toward the front viewing angle, thereby increasing the light-emitting brightness of the curved display area 2 "at the front viewing angle.

However, with this structure, the light-emitting layer 3 ″ can be tilted with respect to the substrate 4 ″ only by specially designing the evaporation process of other film layers between the light-emitting layer 3 ″ and the substrate 4 ″, which results in higher manufacturing cost and greater process difficulty of the curved display panel. Moreover, for different curved display panels, the curved display regions 2 ″ have different degrees of curvature, and if the above-mentioned arrangement is adopted, the degree of inclination of the light-emitting layer 3 ″ needs to be customized for each curved display panel, which is not conducive to mass production.

Based on this, an embodiment of the present invention provides a curved display panel, fig. 3 is a schematic structural diagram of the curved display panel provided in the embodiment of the present invention, fig. 4 is a cross-sectional view taken along a direction a1-a2 in fig. 3, and as shown in fig. 3 and fig. 4, the curved display panel includes: the display device comprises a display area 1, wherein the display area 1 comprises a plane display area 2 and a curved surface display area 3, the plane display area 2 refers to an area which is not bent in the display area 1, the curved surface display area 3 refers to an area which is bent in the display area 1, the curved surface display area 3 can be an arc surface display area, and it needs to be noted that, with reference to fig. 4, when a user watches or operates a display screen, the visual angle direction of the user is generally perpendicular to the plane where the plane display area 2 is located, in the embodiment of the invention, the visual angle direction perpendicular to the plane where the plane display area 2 is located is defined as a normal visual angle direction PP, and the visual angle direction having a certain included angle with the normal visual angle direction PP is defined as an oblique visual angle direction OP; the display panel comprises a substrate base plate 4, wherein an array layer 5 is arranged on one side, facing the light emitting direction of the curved surface display panel, of the substrate base plate 4, a plurality of pixels 6 are arranged in the array layer 5, and each pixel 6 comprises a plurality of sub-pixels 7; and the grating layer 8 is positioned on one side of the array layer 5, which faces away from the substrate base plate 4, and the grating layer 8 comprises a grating structure 9 positioned in the curved surface display area 3.

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

Fig. 6, with reference to fig. 5, is a schematic diagram of a grating period of the first grating unit in the first curved surface region and the second curved surface region provided in the embodiment of the present invention, as shown in fig. 6, the curved surface display region 3 includes a first curved surface region 10 and a second curved surface region 11, a curvature of the first curved surface region 10 is smaller than a curvature of the second curved surface region 11, and a grating period P1 of the first grating unit 91 located in the first curved surface region 10 is larger than a grating period P2 of the first grating unit 91 located in the second curved surface region 11.

It should be noted that the first curved surface region 10 and the second curved surface region 11 are not meant to be specific limitations on any two regions, and in any two regions in the curved surface display region 3, as long as the bending curvature of one region is larger than that of the other region, the region with the smaller bending curvature is regarded as the first curved surface region 10, and the region with the larger bending curvature is regarded as the second curved surface region 11.

In addition, it should be further noted that, when the sub-pixel 7 includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, in the first grating unit 91 overlapping the red sub-pixel, the grating period of the first grating unit 91 located in the first curved surface region 10 is greater than the grating period of the first grating unit 91 located in the second curved surface region 11; in the first grating unit 91 overlapping the green sub-pixel, the grating period of the first grating unit 91 located at the first curved surface region 10 is greater than the grating period of the first grating unit 91 located at the second curved surface region 11; in the first grating unit 91 overlapping the blue sub-pixel, the grating period of the first grating unit 91 located at the first curved surface region 10 is greater than the grating period of the first grating unit 91 located at the second curved surface region 11. The change in the grating period of the grating structure 9 shown in fig. 6 can be understood as a change in the grating period of the first grating unit 91 corresponding to the red sub-pixel, a change in the grating period of the first grating unit 91 corresponding to the green sub-pixel, or a change in the grating period of the first grating unit 91 corresponding to the blue sub-pixel.

In addition, it should be noted that, referring to fig. 4 again, each sub-pixel 7 includes a pixel driving circuit 12 and an organic light emitting diode 13 which are electrically connected. The pixel driving circuit 12 includes a thin film transistor 14, and the pixel driving circuit 12 is configured to provide a driving current to the organic light emitting diode 13 to drive the organic light emitting diode to emit light. Further, the thin film transistor 14 includes an active layer 15, a gate layer 16, and a source drain layer 17 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 sequentially arranged along the light emitting direction of the curved display panel. The light emitted from the sub-pixel 7 in the embodiment of the present invention refers to the light emitted from 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 an insulating layer between any two of these six layers constitute the array layer 5. In addition, it should be noted that the pixel driving circuit 12 shown in fig. 4 includes only one thin film transistor 14, which is for illustrative purposes only, and in practical applications, the pixel driving circuit 12 may include a plurality of thin film transistors 14.

In the curved display panel provided in the embodiment of the present invention, by providing the grating layer 8 in the curved display area 3, when light emitted from the sub-pixels 7 in the curved display area 3 enters the grating layer 8, diffraction occurs in the grating structure 9, and the propagation direction of the diffracted light changes, so that a part of the light approaches the normal viewing angle direction PP and is emitted. Further, referring to fig. 6 again, in the first curved region 10 with a small degree of curvature, for the light emitted by the sub-pixel 7 in the region, the diffracted light DL1 only needs to deviate from the normal N1 by a small angle to be emitted close to the normal viewing angle direction PP, that is, in the region, if the brightness of the emitted light at the normal viewing angle is to be improved, only the diffracted light needs to be controlled to have a small diffraction angle β 1; on the other hand, in the second curved surface region 11 with a large degree of curvature, the diffracted light DL2 needs to be deviated from the normal N2 by a large angle in the region of the light emitted from the sub-pixel 7 to be emitted toward the normal viewing angle direction PP, that is, in the region, in order to increase the brightness of the emitted light at the normal viewing angle, it is necessary to control the diffracted light to have a large diffraction angle β 2. According to the grating formula

Where α is an incident angle of incident light to the grating structure 9, β is a diffraction angle of diffracted light after diffraction, and n1 is a medium in which the incident light is presentN2 is a refractive index of a medium in which diffracted light is located, λ is a wavelength of incident light to the grating structure 9, P is a grating period, m is a diffraction order, m is 0, ± 1, ± 2, …, and when m is a negative value, diffracted light deviates from one side of a normal line, sin β is a positive value, when m is a positive value, diffracted light deviates from the other side of the normal line, and sin β is a negative value, it is known that a diffraction angle β in the same order of diffraction 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 is, and therefore, in the first grating unit 91 covering the sub-pixel 71 of the first color, by making the grating period P2 of the first grating unit 91 in the second curved surface region 11 smaller than the grating period P1 of the first grating unit 91 in the first curved surface region 10, the diffracted light in the first curved surface region 10 can be made to have a smaller diffraction angle β 1, and the diffracted light in the second curved surface region 11 has a larger diffraction angle β 2, thus, the diffraction angles of the diffracted lights in the first curved surface region 10 and the second curved surface region 11 are adjusted to different degrees, so that the diffracted lights in the first curved surface region 10 and the second curved surface region 11 are both emitted from the normal viewing angle direction PP.

It can be seen that, with the curved display panel provided in the embodiment of the present invention, in the first grating unit 91 covering the sub-pixel 71 of the first color, the grating period P2 of the first grating unit 91 in the second curved surface region 11 is smaller than the grating period P2 of the first grating unit 91 in the first curved surface region 10, so that the diffraction angles of the diffracted lights in the regions with different degrees of curvature can be adjusted to different degrees, and thus the diffracted lights in each region of the curved display region 3 are all emitted towards the normal viewing angle direction PP, and the uniformity of the luminance of the different regions of the curved display region 3 at the normal viewing angle is effectively improved, and further the uniformity of the luminance of the curved display region 3 and the luminance of the flat display region 2 at the normal viewing angle is improved, the color cast phenomenon of the curved display region 3 is significantly improved, and the display performance is optimized.

It should be noted that, as can be seen from the principle of grating diffraction, a spectrum of m-order diffraction is obtained when a mixed light beam having different wavelengths is diffracted by the grating structure 9, where m is 0, ± 1, ± 2, and …, and in the same-order diffraction, the light beams having different wavelengths in the mixed light beam are dispersed after diffraction, and the dispersed light beams are sequentially arranged in the order of wavelength to form a series of discrete spectral lines. Of the m-order diffraction, the intensity of the 0-order diffraction is strongest, and gradually decreases as | m |. In the embodiment of the invention, the diffraction angle corresponding to non-0-order diffraction can be adjusted by adjusting the grating period, so that the first-order diffraction light with higher intensity is emitted towards the normal viewing angle direction PP, and the emergent brightness of the curved surface display area 3 under the normal viewing angle is compensated to a greater extent.

For example, assuming that the second curved surface region 11 is bent by 90 ° compared to the planar region 2, the refractive index n1 of the medium in which the incident light is located and the refractive index n2 of the medium in which the diffracted light is located are both 1.5, for green light emitted by the green sub-pixel and having a central wavelength of 550nm, the light emitted in a direction parallel to the normal, that is, the light having the incident angle α of 0 is taken as an example, if the diffraction angle β of the light after the first-order diffraction of the light is adjusted to 45 °, according to the grating formula, the grating period P of 519nm can be obtained. Because the wavelength range of the green light is 500nm to 600nm, the value of the grating period can be floated by 50nm up and down on the basis of 519nm grating period corresponding to 550nm green light in consideration of the change of the wavelength of the green light, so that the grating period is matched with green light with different wavelengths, and at the moment, the grating period of the first grating unit 91 corresponding to the green sub-pixel can be adjusted within the range of 569nm to 469 nm.

In one embodiment, referring to fig. 5 and 6 again, in the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3 (the direction indicated by the dotted arrow in fig. 5 and 6), the curvature of the curved display area 3 increases and the grating period of the plurality of first grating units 91 in the grating structure 9 decreases, wherein 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 away from the flat display area 2.

For example, in the first grating unit 91 corresponding to the red sub-pixel, the grating period of the portion of the first grating unit 91 decreases in 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 period of the portion of the first grating unit 91 decreases in the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, and in the first grating unit 91 corresponding to the blue sub-pixel, the grating period of the portion of the first grating unit 91 decreases in the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3.

It should be noted that, in the embodiment of the present invention, the inner edge 211 of the curved display area 3 is defined only to clearly illustrate the increasing direction of the curvature of the curved display area 3, and in an actual product structure, the flat display area 2 and the curved display area 3 are disposed in communication, and there is no solid structure of the inner edge 211 of the curved display area 3.

As can be seen from the above analysis, the curved display area 3 is curved more toward the outer edge 212 of the curved display area 3, and in this area, the first grating unit 91 needs to have a smaller grating period so that the diffracted light has a larger diffraction angle β, and the diffracted light tends to be emitted in the normal viewing angle direction PP. Therefore, by decreasing the grating period of the first grating unit 91 of the sub-pixel 71 covering the first color in the direction from the inner edge 211 to the outer edge 212 of the curved surface display area 3, the diffraction angle of the diffracted light in the direction can be increased, and the diffracted light in each area of the curved surface display area 3 can be emitted in the normal viewing angle direction PP, thereby effectively improving the color shift of each area of the curved surface display area 3.

Further, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, the grating periods of the plurality of first grating units 91 in the grating structure 9 decrease linearly, so that the grating periods gradually change regularly, and the diffraction angle of the diffracted light is adjusted regularly.

In one embodiment, the diffraction efficiency of the plurality of first grating elements 91 in the grating structure 9 increases in the direction of extension of the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3. For example, in the first grating unit 91 corresponding to the red sub-pixel, the diffraction efficiency of the portion of the first grating unit 91 increases in a direction toward the outer edge 212 along the inner edge 211 of the curved display area 3, in the first grating unit 91 corresponding to the green sub-pixel, the diffraction efficiency of the portion of the first grating unit 91 increases in a direction toward the outer edge 212 along the inner edge 211 of the curved display area 3, and in the first grating unit 91 corresponding to the blue sub-pixel, the diffraction efficiency of the portion of the first grating unit 91 increases in a direction toward the outer edge 212 along the inner edge 211 of the curved display area 3. Specifically, the diffraction efficiency of the first grating unit 91 may be adjusted by adjusting the duty ratio and height of the first grating unit 91, the refractive index difference between the first grating unit 91 and the external medium, and the like.

As can be seen from the above analysis, the larger the curvature of the curved display area 3 is, the larger the deviation between the propagation direction of the light emitted from the sub-pixel 7 and the normal viewing angle direction PP is, the more difficult the diffracted light is to be adjusted to the normal viewing angle direction PP for emission, so that the number of diffracted lights satisfying the normal viewing angle direction PP for emission is small, and the luminance of the emitted light at the normal viewing angle is correspondingly low. Therefore, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, the diffraction efficiency of the plurality of first grating units 91 in the grating structure 9 is increased, so that the light emitting intensity of the diffracted light in the area with larger bending degree can be increased, the quantity of the diffracted light emitted in the direction PP tending to the normal viewing angle is increased, the light emitting brightness of the part of the area under the normal viewing angle is increased, and the consistency of the light emitting brightness of different areas of the curved display area 3 under the normal viewing angle is improved.

It should be noted that, in the embodiment of the present invention, the diffraction efficiency of the first-order diffraction with greater intensity may be adjusted, so that the first-order diffraction with greater intensity is emitted more toward the normal viewing angle direction PP, so as to compensate the light-emitting brightness of the curved display area 3 at the normal viewing angle to a greater extent.

In an implementation manner, fig. 7 is a schematic diagram of a grating period of a first grating unit corresponding to different color sub-pixels in the same pixel according to an embodiment of the present invention, as shown in fig. 7, 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, wherein the red grating unit 25 covers the red sub-pixel 22, a 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, a 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 a 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, the grating period of the blue grating unit 27 covering the blue sub-pixel 24 is Pb, and the Pr, Pg and Pb satisfy: pr > Pg > Pb.

It is understood that the red sub-pixel 22, the green sub-pixel 23 and the blue sub-pixel 24 of the same pixel 6 are located at similar positions, and therefore, the bending degree of the region of the curved display area 3 where the red sub-pixel 22, the green sub-pixel 23 and the blue sub-pixel 24 are located can be considered to be the same. However, since the wavelengths of red light, green light, and blue light are different, the wavelength of red light is the largest, and the wavelength of blue light is the smallest, it can be seen from the grating formula that, in the case where the incident angles α are the same, by making Pr, Pg, and Pb satisfy: pr is more than Pg and more than Pb, so that the diffraction angles of red light, green light and blue light in the same pixel 6 tend to be the same, and light rays with different colors emitted by the same pixel 6 can tend to be transmitted in the same direction after being diffracted, thereby ensuring the accuracy of the color presented by the pixel 6 and further improving the color cast phenomenon.

In an implementation manner, fig. 8 is a schematic structural diagram of a grating layer provided in an embodiment of the present invention, as shown in fig. 8, a grating structure 9 includes a plurality of microstructures 28 and a plurality of slits 29, the plurality of microstructures 28 are disposed at intervals in the curved display area 3, the slits 29 are located between two adjacent microstructures 28, incident light entering the grating structure 9 is diffracted in the slits 29, and meanwhile, the microstructures 28 are further configured to refract and/or scatter light emitted by the sub-pixel 7, at this time, the width of the slits 29 is on the order of tens of micrometers, and the microstructures 28 may be light-transmissive prism structures.

Under the structure, the grating structure 9 can not only utilize the slit 29 to realize diffraction, but also further utilize the microstructure 28 to refract and/or scatter part of light when the part of light enters the microstructure 28, so as to realize adjustment of the propagation direction of the part of light, so that the part of light tends to be transmitted in the normal viewing angle direction PP, and the light-emitting brightness of the curved surface display area 3 under the normal viewing angle is improved to a greater extent.

Therefore, the applicant also performs simulation tests on the light-emitting brightness of the curved surface display area 3 when the grating layer 8 is not arranged in the curved surface display panel and the light-emitting brightness of the curved surface display area 3 when the grating layer 8 is arranged in the curved surface display panel, and under the condition that the curved surface display area 3 is bent by 90 degrees compared with the planar display area 2, fig. 9 is a simulation schematic diagram of the light-emitting brightness of the curved surface display area at different viewing angles when the grating layer is not arranged in the embodiment of the present invention, as shown in fig. 9, if the grating layer 8 is not used for diffracting, refracting and/or scattering light, as shown by an actual simulation curve in the diagram, the light intensity of the curved surface display area 3 reaches the maximum at an oblique viewing angle of about +60 degrees, and the light intensity at a positive viewing angle (viewing angle of 0 degree) is almost zero. Fig. 10 is a simulation diagram of the light brightness of the curved surface display area at different viewing angles after the grating layer is disposed according to the embodiment of the present invention, as shown in fig. 10, after the grating layer 8 is used to diffract, refract and/or scatter light, as shown by an actual simulation curve in the drawing, the light intensity of the curved surface display area 3 at an oblique viewing angle is reduced, and the light intensity at a positive viewing angle (viewing angle is 0 °) is increased to about 35% of the peak intensity. Therefore, the light-emitting brightness of the curved surface display area 3 under the normal viewing angle can be effectively improved by adopting the grating layer provided by the embodiment of the invention, and the color cast phenomenon of the curved surface display area 3 is improved.

In the simulation test, the applicant performed a test based on the curved display panel having the structure shown in fig. 3, in the structure of the curved display panel shown in fig. 3, the curved display panel has a major axis K1 and a minor axis K2, two curved display regions 3 are respectively provided on both sides of the curved display panel in the direction of the minor axis K2, and the curved display regions 3 are not provided on both sides of the curved display panel in the direction of the major axis K1. The actual simulation curves shown in fig. 9 and 10 represent the luminance distributions of the curved display panel at different viewing angles in the direction of the short axis K2, the reference curves shown in fig. 9 and 10 represent the luminance distributions of the curved display panel at different viewing angles in the direction of the long axis K1, and since the curved display regions 3 are not disposed on both sides of the curved display panel in the direction of the long axis K1, the luminance distributions of the curved display regions 3 at different viewing angles do not exist, and therefore, the above analysis is performed based on the actual simulation curves.

It should be noted that the structure of the curved display panel illustrated in fig. 3 is only an exemplary structure, and in other alternative embodiments of the present invention, two curved display regions 3 may be respectively disposed on two sides of the curved display panel in the direction of the short axis K2 and on two sides of the curved display panel in the direction of the long axis K1.

In one embodiment, referring to fig. 8 again, along the extending direction (the direction shown by the dotted arrow in fig. 8) from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, the curvature of the curved display area 3 increases, and the degree of light scattering and/or refraction of the plurality of microstructures 28 in the grating structure 9 increases, wherein 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 away from the flat display area 2.

It can be known from the above analysis that the larger the curvature of the curved display area 3 is, the more serious the color shift phenomenon is, therefore, in the extending direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the light scattering degree and/or the light refraction degree of the microstructures 28 are increased progressively, and a greater number of light rays are refracted and/or scattered in the area with the larger curvature degree, so that a greater number of refracted light rays can be emitted towards the normal viewing angle direction PP, thereby improving the light emitting brightness of different areas under the normal viewing angles to different degrees, and further improving the uniformity of the light emitting brightness of the curved display area 3 and the flat display area 2 under the normal viewing angles.

Further, the adjustment of the light scattering degree and/or the light refraction degree of the microstructures 28 can be realized by adjusting the height of the microstructures 28, fig. 11 is another structural schematic diagram of the grating layer provided in the embodiment of the present invention, as shown in fig. 11, along the extending direction from the inner edge 211 of the curved display area 3 to the outer edge 212 of the curved display area 3, the heights h of the plurality of microstructures 28 in the direction perpendicular to the tangent plane of the substrate 4 are increased gradually, wherein the tangent plane of the substrate 4 refers to the tangent plane of the substrate 4 at the position corresponding to the center point of the microstructures 28, and the height of the microstructures 28 can be changed within the range of 5 μm to 20 μm, so as to avoid the thickness of the grating layer 8 from being too large on the premise of ensuring a good refraction effect, thereby avoiding the adverse effect on the overall module thickness of the curved display panel.

Taking refraction as an example, fig. 12 is a schematic view of refraction of light rays in microstructures with different heights provided by the embodiment of the present invention, as shown in fig. 12, the height of the microstructure 28 determines an included angle θ between a side surface and a bottom surface of the microstructure 28, where the bottom surface of the microstructure 28 refers to a surface of the microstructure 28 close to the substrate 4, the side surface of the microstructure 28 refers to a surface intersecting the bottom surface, and the larger the height of the microstructure 28 is, the larger the value of θ is. When light is incident on the microstructure 28 in a certain direction, the larger θ is, the smaller 90- θ is, the included angle between the normal viewing angle direction PP and the normal line, and when the refraction angle of the refracted light is δ and 90- θ + δ approaches 0 °, the included angle between the refracted light and the normal viewing angle direction PP approaches 0, and the refracted light tends to be emitted from the normal viewing angle direction PP. Since the color shift phenomenon is more serious in the region with a larger bending degree, the region needs to compensate the brightness of the emergent light under the positive viewing angle to a greater extent. In the embodiment of the present invention, by increasing the height of the microstructure 28 in the direction from the inner edge 211 to the outer edge 212 of the curved display area 3, the larger θ of the microstructure 28 in the region with the larger bending degree can be, and further the smaller 90- θ is, so that the refraction angle δ corresponding to more refracted light can satisfy that 90- θ + δ approaches to 0 °, and further more refracted light can tend to exit in the front viewing angle direction PP, and the light-exiting brightness under the front viewing angle is compensated to a greater extent. Specifically, for example, the microstructure 28 is located in the region of the curved display area 3 bent by 90 ° compared to the flat display area 2, please refer to fig. 12 again, in the microstructure 28 with a smaller height, since θ 1 is smaller, 90- θ 1 is larger, only the refracted light with a smaller refraction angle δ 1 can satisfy that 90- θ 1+ δ 1 approaches to 0 °, and therefore, only a small amount of refracted light can be emitted toward the front viewing angle direction PP; in the microstructure 28 with a larger height, because θ 2 is larger, 90- θ 2 is smaller, and at this time, the refraction angle δ 2 is slightly larger, which also satisfies that 90- θ 2+ δ 2 approaches to 0 °, so that a larger amount of refracted light can tend to exit in the normal viewing angle direction PP, and the light-emitting brightness of the region under the normal viewing angle is increased to a greater extent.

In addition, according to the refraction formula n1sin μ ═ n2sin δ, where n1 is the refractive index of the medium in which the incident light is incident and n2 is the refractive index of the medium in which the refracted light is incident, it can be understood that n1 and n2 can be adjusted to make the incident light with a smaller refraction angle δ, so that 90- θ + δ can more easily approach 0 °.

In one embodiment, with reference to fig. 13 to 16, the microstructure 28 has a first cross section 30, and the first cross section 30 is parallel to a cross section of the substrate 4, wherein the cross section of the substrate 4 is a cross section of the substrate 4 at a position corresponding to a center point of the microstructure 28, and the first cross section 30 is rectangular, triangular, elliptical, circular, or diamond, and in this case, the microstructures 28 may be distributed in a point shape. Of course, in other embodiments of the present invention, the first cross-section 30 may have other irregular shapes.

It should be noted that, in the curved surface display area 3, the first cross sections 30 of different microstructures 28 may have the same shape, for example, with reference to fig. 8, fig. 13 is a schematic diagram of the first cross sections in the microstructures provided in the embodiment of the present invention, as shown in fig. 13, the first cross sections 30 of the microstructures 28 in the curved surface display area 3 are all triangular, and at this time, the microstructures 28 are all cone-shaped structures, or, with reference to fig. 4, fig. 14 is another schematic diagram of the first cross sections in the microstructures provided in the embodiment of the present invention, as shown in fig. 14, the first cross sections 30 of the microstructures 28 in the curved surface display area 3 are all circular, and at this time, the microstructures 28 are all cylindrical structures, or fig. 15 is another schematic diagram of the first cross sections in the microstructures provided in the embodiment of the present invention, as shown in fig. 15, and the first cross sections 30 of the microstructures 28 in the curved surface display area 3 are all diamond-shaped structures. Still alternatively, in the curved surface display area 3, the first cross sections 30 of different microstructures 28 may have the same shape, for example, fig. 16 is another schematic diagram of the first cross section of the microstructure provided in the embodiment of the present invention, as shown in fig. 16, the shape of the first cross section 30 of a part of microstructures 28 in the curved surface display area 3 is a triangle, the shape of the first cross section 30 of a part of microstructures 28 is a circle, and the shape of the first cross section 30 of another part of microstructures 28 is a diamond. By adopting the arrangement mode, the arrangement flexibility of the shape of the microstructure 28 can be improved, and the first section 30 of the microstructure 28 is arranged in the conventional shape, so that the structural complexity of the microstructure 28 can be reduced, and the process difficulty can be simplified.

Alternatively, fig. 17 is another schematic structural diagram of a microstructure provided in the embodiment of the present invention, as shown in fig. 17, the microstructure 28 is a strip-shaped structure, in the curved display area 3, the plurality of microstructures 28 are arranged along a first direction, and a single microstructure 28 extends along a second direction, the first direction is an extending direction from an inner edge 211 of the curved display area 3 to an 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, the outer edge 212 of the curved display area 3 is far from the flat display area 2, and the second direction intersects with the first direction, at this time, the slits 29 formed between the microstructures 28 are strip-shaped slits, so that the grating structure 9 has better diffraction performance.

In one embodiment, with reference to fig. 18 to 21, the curved display panel further includes an encapsulation layer 31, a functional layer 32, a glue layer 33, a cover 34, and a protection film 35. The encapsulation layer 31 is used to encapsulate the array layer 5, and encapsulates the array layer 5 to prevent external water and oxygen from permeating into the array layer 5. The functional layer 32 is located on a side of the encapsulation layer 31 opposite to the substrate 4, and is used for implementing functions such as touch control and polarization. The glue layer 33 is located on a side of the functional layer 32 facing away from the base substrate 4, and may be formed of a transparent optical glue material. The cover plate 34 is located on a side of the glue layer 33 opposite to the substrate 4, and is specifically made of glass, and is bonded and fixed with the functional layer 32 through the glue layer 33. The protective film 35 is located on a side of the cover plate 34 opposite to the substrate base plate 4, and may be formed of a polyester resin material, and is used for covering the cover plate 34 and protecting the display module.

Based on the above structure, fig. 18 is a schematic diagram of the functional layer provided in the embodiment of the present invention when the functional layer is reused as a grating layer, as shown in fig. 18, the functional layer 32 includes a grating structure 9, at this time, the functional layer 32 is reused as a grating layer 8, and the functional layer 32 has functions of touch control, polarization, diffraction of light, and the like. Fig. 19 is a schematic view of the adhesive layer multiplexing as a grating layer according to the embodiment of the present invention, and as shown in fig. 19, the adhesive layer 33 includes a grating structure 9, in this case, the adhesive layer 33 multiplexing as a grating layer 8, and the adhesive layer 33 has functions of adhering and diffracting light. Fig. 20 is a schematic view of the cover plate according to the embodiment of the present invention multiplexed into a grating layer, and as shown in fig. 20, the cover plate 34 includes the grating structure 9, at this time, the cover plate 34 is multiplexed into the grating layer 8, and the cover plate 34 has a function of diffracting light. Fig. 21 is a schematic diagram of the protective film according to the embodiment of the present invention when multiplexed into a grating layer, and as shown in fig. 21, the protective film 35 includes a grating structure 9, in this case, the protective film 35 is multiplexed into a grating layer 8, and the protective film 35 has functions of protecting and diffracting light. By adopting the above arrangement mode, the grating layer 8 can be formed by multiplexing the original film layers in the curved surface display panel without additionally arranging a film layer, so that the grating layer 8 does not need to additionally occupy the film layer space, and the light and thin design of the curved surface display panel is more facilitated.

In addition, when the grating layer 8 is used with the above film layers, the microstructure 28 may be located on a side of the film layer facing the substrate 4, or on a side of the film layer facing away from the substrate 4. For example, referring to fig. 21 again, when the protective film 35 is reused as the grating layer 8, the microstructure 28 may be located on a side of the protective film 35 facing away from the substrate 4, or fig. 22 is another schematic diagram of the protective film provided by the embodiment of the present invention when reused as the grating layer, as shown in fig. 22, the microstructure 28 may also be located on a side of the protective film 35 facing the substrate 4. In addition, 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 microstructures 28 and the slits 29 on the polyester resin substrate, so that the film layer has both protective and optical functions.

Further, fig. 23 is another schematic diagram of the functional layer provided in the embodiment of the present invention when the functional layer is reused as a grating layer, as shown in fig. 23, the functional layer 32 includes a touch layer 36 and a polarizer 37, wherein the touch layer 36 is disposed on a 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, and the insulating layer 39 is disposed on a side of the touch electrode layer 38 facing away from the substrate 4; the polarizer 37 is arranged on the side of the insulating layer 39 opposite to the substrate base plate 4; the insulating layer 39 in the touch layer 36 includes the grating structure 9, and at this time, the insulating layer 39 is multiplexed as the grating layer 8.

It should be noted that, in the manufacturing process of the curved display panel, a plurality of film layers included in the array layer 5 may be formed by using semiconductor processes such as coating and photolithography, please refer to fig. 23 again, the encapsulation layer 31 includes a plurality of overlapped organic encapsulation layers 61 and inorganic encapsulation layers 62, the organic encapsulation layers 61 and the inorganic encapsulation layers 62 may be formed by using semiconductor processes such as chemical vapor deposition and inkjet printing, the touch electrode layer 38 may specifically include a buffer layer 63, a first electrode layer 64, an electrode insulation layer 65 and a second electrode layer 66 that are sequentially disposed along the light emitting direction of the curved display panel, and the film layers may also be formed by using semiconductor processes such as coating and photolithography. Therefore, in the manufacturing process of the curved display panel, the array layer 5, the encapsulation layer 31 and the touch layer 36 may be formed continuously on a production line by using a semiconductor process, and then the polarizer 37, the adhesive layer 33, the cover plate 34 and the protection film 35 are disposed on the side of the touch layer 36 opposite to the array layer 5.

Therefore, in the embodiment 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 flow of the array layer 5, the encapsulation layer 31, and the touch layer 36 is finished, the microstructure 28 and the slit 29 may be formed on the insulating layer 39 by using a semiconductor process such as photolithography, and this setting manner does not need to adjust the original process flow 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, and the process complexity is low and is easier to implement.

In addition, it should be noted that, the thickness of the insulating layer 39 is usually in the range of 1 to 10 μm, and when the insulating layer 39 is etched by using the photolithography process, please refer to fig. 23 again, the insulating layer 39 in the region where the slit 29 is located may be partially etched, for example, only the slit 29 is etched by 5 μm, or fig. 24 is another schematic diagram when the functional layer provided by the embodiment of the present invention is reused as a grating layer, as shown in fig. 24, the insulating layer 39 in the region where the slit 29 is located may also be completely etched away.

In one embodiment, with reference to fig. 25 and 26, the curved display panel further includes an encapsulation layer 31, a functional layer 32, a glue layer 33, a cover 34, and a protective film 35. The encapsulation layer 31 is used to encapsulate the array layer 5, and encapsulates the array layer 5 to prevent external water and oxygen from permeating into the array layer 5. The functional layer 32 is located on a side of the encapsulation layer 31 opposite to the substrate 4, and is used for implementing functions such as touch control and polarization. The glue layer 33 is located on a side of the functional layer 32 facing away from the base substrate 4, and may be formed of a transparent optical glue material. The cover plate 34 is located on a side of the glue layer 33 opposite to the substrate 4, and is specifically made of glass, and is bonded and fixed with the functional layer 32 through the glue layer 33. The protective film 35 is located on a side of the cover plate 34 opposite to the substrate base plate 4, and may be formed of a polyester resin material, and is used for covering the cover plate 34 and protecting the display module.

Based on the above structure, fig. 25 is a schematic view of the grating layer provided in the embodiment of the present invention when the grating layer is located between the package layer and the adhesive layer, as shown in fig. 25, the grating layer 8 is located between the package layer 31 and the adhesive layer 33, or fig. 26 is a schematic view of the grating layer provided in the embodiment of the present invention when the grating layer is located between the adhesive layer and the cover plate, as shown in fig. 26, 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 arranged film layer, and is not multiplexed with the original film layer in the curved surface display panel, so that the process of the original film layer is not required to be adjusted, and the manufacturing complexity of the curved surface display panel is reduced.

It should be noted that, when the grating layer 8 is a film layer that is disposed independently, the microstructure 28 may be located on a side of the grating layer 8 facing the substrate 4, or on a side of the grating layer 8 facing away from the substrate 4. For example, referring to fig. 26 again, when the grating layer 8 is located between the glue layer 33 and the cover plate 34, the microstructure 28 may be located on a side of the grating layer 8 facing away from the substrate 4, or fig. 27 is another schematic view of the grating layer provided in the embodiment of the present invention located between the glue layer and the cover plate, as shown in fig. 27, the microstructure 28 may also be located on a side of the grating layer 8 facing toward the substrate 4.

Further, referring to fig. 28 and fig. 29, the functional layer 32 includes a touch layer 36 and a polarizer 37, where the touch layer 36 is disposed on a side of the package layer 31 opposite to the substrate 4, and the touch layer 36 includes a touch electrode layer 38 and an insulating layer 39, at this time, fig. 28 is another schematic diagram of the grating layer provided in the embodiment of the present invention when the grating layer is disposed between the package layer and the adhesive layer, as shown in fig. 28, the grating layer 8 is disposed between the touch layer 36 and the polarizer 37, or fig. 29 is another schematic diagram of the grating layer provided in the embodiment of the present invention when the grating layer is disposed between the package layer and the adhesive layer, as shown in fig. 29, the grating layer 8 is disposed between the polarizer 37 and the adhesive layer 33.

In the manufacturing process of the curved-surface display panel, the array layer 5, the encapsulation layer 31 and the touch layer 36 are formed by a semiconductor process on one production line, so that the grating layer 8 is arranged on the side of the touch layer 36, which is opposite to the substrate 4, and the original process flows of the encapsulation layer 31 and the touch layer 36 do not need to be adjusted, thereby reducing the process complexity.

In an implementation manner, fig. 30 is a schematic structural diagram of a grating layer provided in an embodiment of the present invention, and as shown in fig. 30, the grating layer 8 further includes a substrate 40 for supporting the microstructures 28, and the microstructures 28 are formed of a photosensitive adhesive material. Specifically, the grating layer 8 of such a structure may be formed by using a UV transfer method: the base material 40 is attached to a transfer printing mold, the transfer printing mold comprises a groove for forming the microstructure 28, after attachment, a photosensitive adhesive material is filled in a gap between the base material 40 and the transfer printing mold, and then the photosensitive adhesive material is cured and the transfer printing mold is removed, so that the cured photosensitive adhesive material forms the microstructure 28.

Further, when grating layer 8 locates curved surface display panel as independent rete in, grating layer 8's the outside still can set up the one deck glue film to improve the adhesion between grating layer 8 and other retes, and then improve the steadiness that grating layer 8 set up. At this time, after curing the photoresist material and removing the transfer mold, a glue layer, such as a transparent optical glue, may be attached to the side of the substrate 40 opposite to the microstructures 28 and/or to the side of the microstructures 28 opposite to the substrate 40. In addition, in order to protect the formed grating layer 8 from being damaged, a grating protection film may be further disposed on a side of the substrate 40 facing away from the microstructure 28 or a side of the adhesive layer attached to the substrate 40 facing away from the microstructure 28, and the grating layer 8 may be removed when being subsequently placed in a curved display panel.

In addition, it should be noted that, no matter the grating layer 8 is multiplexed as an original film layer in the curved display panel or is implemented as an independent film layer, the formation of the patterns of the microstructure 28 can be implemented by a customized mold, such as the above transfer mold, and the curved display panel can be flexibly designed for different curved conditions.

Based on the same inventive concept, an embodiment of the present invention provides a curved display device, fig. 31 is a schematic structural view of the curved display device provided in the embodiment of the present invention, fig. 32 is a sectional view of fig. 31 taken along a direction B1-B2, as shown in fig. 31 and fig. 32, the curved display device includes the curved display panel 100 and a middle frame 200, wherein the curved display panel 100 is located in an accommodating space formed by the middle frame 200. The curved display device can be any display device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic paper book or a television.

Based on the same inventive concept, an embodiment of the present invention provides an electronic device, and fig. 33 is a schematic structural diagram of the electronic device according to the embodiment of the present invention, where the electronic device includes the curved display panel 100 and an image processor 300 (GPU), where the image processor 300 is configured to process an image displayed on the curved 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 electronic paper book or a television.

Based on the same inventive concept, an embodiment of the present invention provides a manufacturing method of a curved display panel, the manufacturing method is used for manufacturing the curved display panel, and with reference to fig. 3 to 6, 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, the curved display area 3 includes a first curved area 10 and a second curved area 11, and a curvature of the first curved area 10 is smaller than a curvature of the second curved area 11. Fig. 34 is a flowchart of a manufacturing method according to an embodiment of the present invention, and as shown in fig. 34, the manufacturing method includes:

step S1: an array layer 5 is formed on the substrate base plate 4, a plurality of pixels 6 are arranged in the array layer 5, each pixel 6 includes a plurality of sub-pixels 7, wherein the specific film structure of the array layer 5 has been described in detail in the above embodiments, and is not described again here.

Step S2: a grating layer 8 is formed on a side of the array layer 5 opposite to the substrate 4, the grating layer 8 includes a grating structure 9 located in the curved display area 3, the grating structure 9 includes a plurality of first grating units 91, one first grating unit 91 covers one first color sub-pixel 71, the first color sub-pixel 71 refers to a sub-pixel for generating a first color light signal, the first color is any one of colors of light signals generated by a plurality of sub-pixels 7 in the array layer, and the first color light signal generated by the first color sub-pixel 71 is emitted through the first grating unit 91.

By adopting the manufacturing method provided by the embodiment of the invention, when the grating layer 8 is formed, for the first grating unit 91 covering the sub-pixel 71 with the first color, the diffraction angles of the diffracted lights in the first curved surface region 10 and the second curved surface region 11 can be adjusted to different degrees by making the grating period of the first grating unit 91 in the second curved surface region 11 smaller than the grating period of the first grating unit 91 in the first curved surface region 10, so that the diffracted lights in the first curved surface region 10 and the second curved surface region 11 are both emitted towards the normal viewing angle direction PP, the consistency of the light emitting brightness of different regions of the curved surface display region 3 under the normal viewing angle is effectively improved, the consistency of the light emitting brightness of the curved surface display region 3 and the plane display region 2 under the normal viewing angle is further improved, the color cast phenomenon of the curved surface display region 3 is remarkably improved, and the display performance is optimized.

Further, in conjunction with fig. 8, the process of forming the grating layer 8 includes: a plurality of microstructures 28 and a plurality of slits 29 are formed, the plurality of microstructures 28 are spaced apart in the curved display area 3, the slits 29 are located between two adjacent microstructures 28, the width of the slits 29 is in the order of tens of micrometers for diffraction, and the microstructures 28 may be light-transmissive prisms for refraction and/or scattering of light emitted from the sub-pixels 7. At this time, the grating structure 9 not only can implement diffraction by using the slits 29, but also can further use the microstructures 28 to refract and/or scatter a part of light when the part of light enters the microstructures 28, so as to adjust the propagation direction of a larger amount of incident light, and to improve the light-emitting brightness of the curved display area 3 under the front viewing angle to a greater extent.

In one embodiment, with reference to fig. 18 to 21, after the array layer 5 is formed on the substrate base plate 4, the manufacturing method further includes: forming a packaging layer 31 for wrapping the array layer 5 and packaging the array layer 5 on one side of the array layer 5, which is opposite to the substrate base plate 4, wherein the packaging layer 31 can comprise a plurality of organic packaging layers and stepless packaging layers which are alternately stacked; a functional layer 32 for realizing functions of touch control, polarization and the like is formed on one side of the packaging layer 31, which is opposite to the substrate base plate 4; forming a glue layer 33 on the side of the functional layer 32 opposite to the base substrate 4; attaching a cover plate 34 on one side of the glue layer 33 opposite to the substrate base plate 4; a protective film 35 is formed on the side of the cover plate 34 facing away from the base plate 4.

Please refer to fig. 18 again, the functional layer 32 includes the grating structure 9, at this time, the functional layer 32 is reused as the grating layer 8, and the functional layer 32 has functions of touch control, polarization, diffraction to light, and the like, or, please refer to fig. 19 again, the adhesive layer 33 has the grating structure 9, at this time, the adhesive layer 33 is reused as the grating layer 8, and the adhesive layer 33 has functions of adhesion and diffraction to light, or, please refer to fig. 20 again, the cover plate 34 includes the grating structure 9, at this time, the cover plate 34 is reused as the grating layer 8, and the cover plate 34 has functions of diffraction to light, or, please refer to fig. 21 again, and the protection film 35 includes the grating structure 9, at this time, the protection film 35 is reused as the grating layer 8, and the protection film 35 has functions of protection and diffraction to light. By adopting the manufacturing method, the grating layer 8 can be formed by multiplexing the original film layers in the curved surface display panel without additionally arranging a film layer, so that the grating layer 8 does not need to additionally occupy the film layer space, and the light and thin design of the curved surface display panel is more facilitated.

Further, in conjunction with fig. 23, when the functional layer 32 includes the grating structure 9, the process of forming the functional layer 32 includes: forming a touch electrode layer 38 on the side of the packaging layer 31 opposite to the substrate base plate 4; forming an insulating layer 39 on one side of the touch electrode layer 38, which is opposite to the substrate base plate 4, etching the insulating layer 39, and forming a plurality of microstructures 28 in the curved display area 3; a polarizer 37 is arranged on the side of the insulating layer 39 facing away from the base substrate 4. That is, in this fabrication mode, the grating layer 8 is multiplexed with the insulating layer 39 in the functional layer 32.

In the manufacturing process of the curved display panel, the array layer 5, the encapsulation layer 31 and the touch layer 36 are formed by a semiconductor process on a production line, and after the touch layer 36 is formed, the polarizer 37, the adhesive layer 33, the cover plate 34, the protective film 35 and other structures are arranged on one side of the touch layer 36, which is opposite to the array layer 5. When the grating layer 8 is reused as the insulating layer 39 in the functional layer 32, the original process flows of the encapsulation layer 31 and the touch electrode layer 38 do not need to be adjusted, only the photolithography process needs to be added in the last process for forming the insulating layer 39, and the process complexity is low.

Or, when the grating layer 8 is multiplexed as the cover plate 34, with reference to fig. 20, fig. 35 is a schematic diagram of a manufacturing process of the cover plate when the grating layer and the cover plate are multiplexed, as shown in fig. 35, a process of forming the cover plate 34 includes: the slits 29 are cut out by means of a laser process, for example a laser compaction process, on the side of the cover plate 34 facing away from the substrate base plate 4, the slits 29 and the microstructures 28 now being located on the side of the cover plate 34 facing away from the substrate base plate 4; or, fig. 36 is a schematic view of another manufacturing process of the cover plate when the grating layer and the cover plate are multiplexed, and as shown in fig. 36, the process of forming the cover plate 34 includes: the microstructure 28 is formed on the side of the cover plate 34 facing the substrate base plate 4 by using a hot bending forming process, specifically, a recessed groove complementary to the microstructure 28 is formed in a region corresponding to the curved surface display region 3 in the 3D hot bending die 41 by using a laser process or the like, and the microstructure 28 is formed on the inner side of the cover plate 34 by using the 3D hot bending die 41 in the hot bending forming process, at this time, the slit 29 and the microstructure 28 are located on the side of the cover plate 34 close to the substrate base plate 4. When the slits 29 and the microstructures 28 are located on different sides of the cover plate 34, the slits 29 and the microstructures 28 are formed in the cover plate 34 by selecting different manufacturing processes, so that the process feasibility can be improved, and the process difficulty can be simplified.

In one embodiment, with reference to fig. 25 and 26, after the array layer 5 is formed on the substrate base plate 4, the manufacturing method further includes: forming a packaging layer 31 for wrapping the array layer 5 and packaging the array layer 5 on one side of the array layer 5, which is opposite to the substrate base plate 4, wherein the packaging layer 31 can comprise a plurality of organic packaging layers and stepless packaging layers which are alternately stacked; a functional layer 32 for realizing functions of touch control, polarization and the like is formed on one side of the packaging layer 31, which is opposite to the substrate base plate 4; forming a glue layer 33 on the side of the functional layer 32 opposite to the base substrate 4; attaching a cover plate 34 on one side of the glue layer 33 opposite to the substrate base plate 4; a protective film 35 is formed on the side of the cover plate 34 facing away from the base plate 4. Referring to fig. 25 again, the grating layer 8 is located between the encapsulation layer 31 and the adhesive layer 33, or referring to fig. 26 again, the grating layer 8 is located between the adhesive layer 33 and the cover plate 34. By adopting the manufacturing method, the grating layer 8 is an independently arranged film layer and is not multiplexed with the original film layer in the curved surface display panel, so that the process of the original film layer is not required to be adjusted, and the manufacturing complexity of the curved surface display panel is reduced.

Further, when the grating layer 8 is an independently disposed film layer, with reference to fig. 30, fig. 37 is a flowchart of a manufacturing process of the grating layer according to an embodiment of the present invention, and fig. 38 is a flowchart of a structure corresponding to fig. 37, as shown in fig. 37 and fig. 38, a process of forming the grating layer 8 includes:

step K1: the substrate 40 is attached to a transfer mold 42, the transfer mold 42 including a groove 43 for forming the microstructure 28, the groove 43 being located in a region of the transfer mold 42 corresponding to the curved display region 3.

Step K2: the gap between the substrate 40 and the transfer mold 42 is filled with a photosensitive adhesive material 44.

Step K3: the photosensitive adhesive material 44 is irradiated with an ultraviolet lamp to cure the photosensitive adhesive material 44.

Step K4: the transfer mold 42 is removed.

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 adaptively adjusted, and the manufacturing process flow does not need to be affected, so that the mass-producibility is improved.

It should be noted that, the transfer mold 42 may be provided with or without an area for accommodating the photosensitive adhesive material 44 at a position corresponding to the flat display area 2, and according to the structure of the transfer mold 42, please refer to fig. 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 the area is of a structure with a flat surface and no slits 29, or fig. 39 is another structural flow chart corresponding to fig. 37, as shown in fig. 39, the area where the flat display area 2 is located may also not be filled with the photosensitive adhesive material 44.

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

step K5: attaching a first adhesive layer 45 and a grating protection film 46 to the side of the substrate 40 opposite to the microstructure 28, and/or attaching a second adhesive layer 47 to the side of the microstructure 28 opposite to the substrate 40; the first adhesive layer 45 and the second adhesive layer 47 may be transparent optical adhesive, so as to improve adhesion between the grating layer 8 and other film layers in the curved display panel, avoid causing a position deviation of the grating layer 8 under the action of an external force factor, protect the formed grating layer 8 from being damaged by the grating protection film 46, and remove the grating layer 8 when the grating layer 8 is subsequently placed in the curved display panel.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A curved display panel, comprising:

2. The curved display panel of claim 1,

the curved display area has an increasing curvature of curvature along an extending direction from an inner edge of the curved display area to an outer edge of the curved display area, and the grating period of the plurality of first grating units in the grating structure decreases;

3. The curved display panel of claim 2,

the grating period of the first grating units in the grating structure is linearly decreased progressively.

4. The curved display panel according to claim 2 or 3, further comprising:

the diffraction efficiency of a plurality of the first grating units in the grating structure increases.

5. The curved display panel of claim 1,

each pixel comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the grating structure comprises a red grating unit, a green grating unit and a blue grating unit, wherein the red grating unit covers the red sub-pixel, a 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, a 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 a blue light signal generated by the blue sub-pixel is emitted through the blue grating unit;

6. The curved display panel of claim 1,

the grating structure comprises a plurality of microstructures and a plurality of slits, the microstructures are arranged in the curved surface display area at intervals, the slits are located between every two adjacent microstructures, and the microstructures are used for refracting and/or scattering light emitted by the sub-pixels.

7. The curved display panel of claim 6,

the curved display area has gradually increased bending curvature along the extending direction from the inner edge of the curved display area to the outer edge of the curved display area, and the light scattering degree and/or the light refraction degree of the plurality of microstructures in the grating structure are gradually increased;

8. The curved display panel of claim 7,

the height of each of the plurality of microstructures increases progressively in a direction perpendicular to the tangent plane of the substrate base plate along the extending direction from the inner edge of the curved surface display area to the outer edge of the curved surface display area, and the tangent plane of the substrate base plate is the tangent plane of the substrate base plate at the position corresponding to the center point of the microstructure.

9. The curved display panel of claim 6,

the microstructure is provided with a first section, the first section is parallel to a section of the substrate base plate, the section of the substrate base plate is a section of the substrate base plate corresponding to the center point of the microstructure, and the first section is rectangular, triangular, elliptical, circular or rhombic.

10. The curved display panel of claim 6,

the microstructures are strip-shaped structures, the microstructures are arranged in the curved surface display area along a first direction, each microstructure extends along a second direction, the first direction is the extending direction from the inner edge of the curved surface display area to the outer edge of the curved surface display area, the inner edge of the curved surface display area is close to the plane display area, the outer edge of the curved surface display area is far away from the plane display area, and the second direction is intersected with the first direction.

11. The curved display panel of claim 6, further comprising a packaging layer, a functional layer, a glue layer, a cover plate, and a protective film, which are stacked:

the packaging layer is used for packaging the array layer;

wherein the functional layer comprises the grating structure;

or, the glue layer comprises the grating structure;

or, the cover plate comprises the grating structure;

or, the protective film comprises the grating structure.

12. The curved display panel of claim 11, wherein the functional layer comprises a touch layer and a polarizer that are laminated;

wherein the insulating layer includes the grating structure.

13. The curved display panel of claim 6, further comprising a stack of encapsulation layers, functional layers, glue layers, cover sheets, and protective films;

the packaging layer is used for packaging the array layer;

14. The curved display panel of claim 13, wherein the functional layer comprises a touch layer and a polarizer that are laminated;

15. The curved display panel of claim 6,

the grating layer also includes a substrate for carrying the microstructures, which are formed from a photosensitive adhesive material.

16. The curved display device is characterized by comprising a middle frame and the curved display panel according to any one of claims 1 to 15, wherein the curved display panel is positioned in a containing cavity formed by the middle frame.

17. An electronic device comprising the curved display panel according to any one of claims 1 to 15 and an image processor, wherein the image processor is configured to process an image displayed on the curved display panel.

18. The manufacturing method of the curved surface display panel is characterized in that the curved surface display panel comprises a display area, the display area comprises a plane display area and a curved surface display area, the curved surface display area comprises a first curved surface area and a second curved surface area, and the bending curvature of the first curved surface area is smaller than that of the second curved surface area;

the manufacturing method comprises the following steps:

19. The method of claim 18, wherein forming the grating layer comprises:

20. The method of claim 19, wherein after forming the array layer on the substrate base plate, the method further comprises:

21. The method of claim 20, wherein when the functional layer comprises the grating, forming the functional layer comprises:

22. The method of claim 20, wherein when the cover plate includes the grating structure, forming the cover plate comprises:

23. The method of manufacturing of claim 18, wherein after forming the array layer on the substrate base plate, the method further comprises:

24. The method of claim 18, wherein forming the grating layer comprises:

curing the photosensitive adhesive material;

and removing the transfer printing mold.