Display panel and display device

Abstract

The invention relates to the technical field of display, particularly provides a display panel and a display device, and aims to solve the technical problem that the display brightness of an existing product is severely attenuated along with the increase of a visual angle. In order to achieve the purpose, the display panel comprises a back plate, a pixel defining layer, a light-emitting element, a thin film packaging layer and a light modulation layer, the light modulation layer comprises a first refractive index layer and a second refractive index layer which are different in refractive index, and the interface of the first refractive index layer and the second refractive index layer comprises a non-planar area. The non-planar area is formed such that a brightness difference between emergent light of a front view angle and emergent light of a non-front view angle within a preset view angle range of the display panel is reduced. By arranging the light modulation layer, the brightness difference of the emergent light between the front view angle and the non-front view angle in the preset view angle range is effectively reduced, so that the brightness of the screen is more uniform when the user watches from different angles, and the satisfaction degree of the user is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and specifically provides a display panel and a display device. Background Art

[0002] Organic light emitting diode display (OLED) as a new type of display device is gradually attracting more attention.

[0003] However, as the viewing angle increases, the display brightness of the product will decay with the increase of the viewing angle, especially at a viewing angle of 45 degrees, the brightness level drops significantly. This is an important challenge for products that require wide viewing angle applications, because the uneven brightness will affect the display quality and cause a poor user experience. Summary of the invention

[0004] In order to overcome the above defects, the present application is proposed to provide a solution or at least partially solve the technical problem that the display brightness of existing products will seriously decay with the increase of viewing angle. The present application provides a display panel and a display device.

[0005] In a first aspect, the present application provides a display panel, comprising:

[0006] Back panel;

[0007] A pixel defining layer disposed on the backplane, having a first opening;

[0008] a light emitting element defined in the first opening;

[0009] A thin film encapsulation layer, covering the pixel definition layer and the light emitting element;

[0010] A light modulation layer is arranged on the thin film encapsulation layer, wherein the light modulation layer includes a first refractive index layer and a second refractive index layer with different refractive indices, and the interface between the first refractive index layer and the second refractive index layer includes a non-planar area, wherein the non-planar area is formed so that the brightness difference between the output light of the normal viewing angle and the output light of the non-normal viewing angle within the preset viewing angle range of the display panel is reduced, and the output light of the non-normal viewing angle deviates at an angle relative to the output light of the normal viewing angle.

[0011] In one embodiment of the present application, the non-planar region includes a first non-planar region, wherein at least part of the emitted light of the light-emitting element at a normal viewing angle is incident from the first refractive index layer and is diverged and emitted into the second refractive index layer at the first non-planar region.

[0012] In one embodiment of the present application, the refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer, and a first groove is formed on the surface of the first refractive index layer away from the back plate, wherein the orthographic projection of the first groove on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the first groove constitutes the first non-planar area.

[0013] In one embodiment of the present application, the first groove is semi-ellipsoidal or inverted trapezoidal.

[0014] In one embodiment of the present application, the opening width of the first opening is equal to the width of the first groove.

[0015] In one embodiment of the present application, the refractive index of the first refractive index layer is smaller than the refractive index of the second refractive index layer, and the first refractive index layer is a right trapezoid, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the side of the right trapezoid constitutes the first non-planar area.

[0016] In one embodiment of the present application, the opening width of the first opening is equal to the lower base width of the regular trapezoid.

[0017] In one embodiment of the present application, the refractive index of the first refractive index layer is smaller than the refractive index of the second refractive index layer, and the first refractive index layer is semi-ellipsoidal, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the arc edge of the semi-ellipsoid constitutes the first non-planar area.

[0018] In one embodiment of the present application, the opening width of the first opening is equal to the bottom width of the semi-ellipsoid.

[0019] In one embodiment of the present application, the non-planar region includes a second non-planar region, and the emitted light of the light emitting element at a non-normal viewing angle is converged at the second non-planar region.

[0020] In one embodiment of the present application, the refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer, and the first refractive index layer is a regular trapezoid, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, the interface at the side of the regular trapezoid constitutes the second non-planar area, and the opening width of the first opening is smaller than the lower base width of the regular trapezoid.

[0021] In one embodiment of the present application, the non-planar region includes a first non-planar region and a second non-planar region.

[0022] Among them, at least part of the output light of the light-emitting element at a normal viewing angle is incident from the first refractive index layer, and is diverged and emitted into the second refractive index layer at the first non-planar area; the output light of the light-emitting element at a non-normal viewing angle is converged at the second non-planar area.

[0023] In one embodiment of the present application, the refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer.

[0024] The first refractive index layer is a regular trapezoid with a second groove as a whole, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, the interface at the side of the regular trapezoid constitutes the second non-planar area, and the opening width of the first opening is smaller than the lower base width of the regular trapezoid;

[0025] The orthographic projection of the second groove on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the first groove constitutes the first non-planar area.

[0026] In one embodiment of the present application, the second groove is semi-ellipsoidal or inverted trapezoidal.

[0027] In one embodiment of the present application, the second groove is in an inverted trapezoidal shape and the groove runs through the first refractive index layer.

[0028] In one embodiment of the present application, the opening width of the first opening is equal to the width of the second groove.

[0029] In one embodiment of the present application, the refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer.

[0030] The first refractive index layer is in the shape of a semi-ellipsoid with a third groove as a whole, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, the width of the bottom surface of the semi-ellipsoid is greater than the opening width of the first opening, and the interface at the arc edge of the semi-ellipsoid constitutes the second non-planar area;

[0031] The orthographic projection of the third groove on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the third groove constitutes the first non-planar area.

[0032] In one embodiment of the present application, the third groove is semi-ellipsoidal or inverted trapezoidal.

[0033] In one embodiment of the present application, the third groove is in an inverted trapezoidal shape and the third groove runs through the first refractive index layer; and / or

[0034] The opening width of the first opening is equal to the width of the third groove.

[0035] In a second aspect, a display device is provided, comprising the aforementioned display panel.

[0036] The above one or more technical solutions of this application have at least one or more of the following Beneficial effects:

[0037] The display panel in the present application includes a backplane, a pixel defining layer, a light emitting element, a thin film encapsulation layer and a light modulation layer, wherein the pixel defining layer is arranged on the backplane and has a first opening, the light emitting element is defined in the first opening, and the thin film encapsulation layer covers the pixel defining layer and the light emitting element; the light modulation layer is arranged on the thin film encapsulation layer, and the light modulation layer includes a first refractive index layer and a second refractive index layer with different refractive indices, and the interface between the first refractive index layer and the second refractive index layer includes a non-planar region, wherein the non-planar region is formed so that the brightness difference between the outgoing light of the normal viewing angle and the outgoing light of the non-normal viewing angle within the preset viewing angle range of the display panel is reduced, wherein the outgoing light of the non-normal viewing angle deviates at an angle relative to the outgoing light of the normal viewing angle. By setting the light modulation layer, especially the design of the non-planar region, the brightness difference between the outgoing light of the normal viewing angle and the non-normal viewing angle within the preset viewing angle range is effectively reduced, so that when viewed from different angles, the brightness of the screen is more uniform, the consistency of the visual experience is improved, and the user's satisfaction is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The disclosure of the present application will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the drawings are used to represent similar components, among which:

[0039] Figure 1 is a schematic diagram of the structure of a display panel in one embodiment of the present application;

[0040] Figure 2 is a simulation schematic diagram of brightness attenuation in one embodiment of the present application;

[0041] Figure 3 is a structural schematic diagram of a display panel in another embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of a display panel in another embodiment of the present application;

[0043] Figure 5 is a structural schematic diagram of a display panel in another embodiment of the present application;

[0044] Figure 6is a schematic diagram of the structure of a display panel in another embodiment of the present application;

[0045] Figure 7 is a simulation schematic diagram of brightness attenuation in another embodiment of the present application;

[0046] Figure 8 is a schematic diagram of the structure of a display panel in another embodiment of the present application;

[0047] Fig. 9 is a schematic diagram of the structure of a display panel in another embodiment of the present application;

[0048] Fig.10 is a structural schematic diagram of a display panel in another embodiment of the present application;

[0049] Fig.11 is a schematic diagram of pixel arrangement of the AA' section in one embodiment of the present application;

[0050] Fig.12 is a structural schematic diagram of a display panel in another embodiment of the present application;

[0051] Fig.13 It is a schematic diagram of the main process of a method for manufacturing a display panel in one embodiment of the present application. DETAILED DESCRIPTION

[0052] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the protection scope of the present application.

[0053] In the description of the present application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, memory, and may also include software parts, such as program code, or a combination of software and hardware. The processor may be a central processing unit, a microprocessor, an image processor, a digital signal processor or any other suitable processor. The processor has data and / or signal processing functions. The processor may be implemented in software, hardware or a combination of the two. Non-temporary computer-readable storage media include any suitable medium that can store program code, such as a disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B or A and B. The singular terms "one" and "the" may also include plural forms.

[0054] At present, the display brightness of traditional display products will decrease as the viewing angle increases, especially at a 45-degree viewing angle, where the brightness level drops significantly. This is an important challenge for products that require wide viewing angle applications, because the uneven brightness will affect the display quality and cause a poor user experience.

[0055] To this end, the present application proposes a display panel and a display device.

[0056] The display panel in the embodiment of the present application mainly includes:

[0057] Back panel 100;

[0058] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0059] A light emitting element 300 defined in the first opening 210;

[0060] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0061] The light modulation layer 500 is arranged on the thin film encapsulation layer 400, wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 with different refractive indices, and the interface between the first refractive index layer 510 and the second refractive index layer 520 includes a non-planar area 502, wherein the non-planar area 502 is formed so that the brightness difference between the output light of the normal viewing angle and the output light of the non-normal viewing angle is reduced within a preset viewing angle range of the display panel, wherein the output light of the non-normal viewing angle deviates at an angle relative to the output light of the normal viewing angle.

[0062] The preset viewing angle range refers to a preset viewing angle range, and the viewing angle within this range is calculated from the front view angle perpendicular to the screen surface and extends to both sides until a certain angle. Exemplarily, [0,60°] can be used as an example of the preset viewing angle range, where 0 degrees refers to the front view angle perpendicular to the screen surface, and 60° refers to the non-front view angle that forms 60° with the front view angle perpendicular to the screen surface.

[0063] The normal viewing angle refers to the viewing angle when the user directly faces the center of the display panel, that is, the viewing angle when the user's line of sight is perpendicular to the surface of the display panel.

[0064] The non-orthopic viewing angle refers to any viewing angle that deviates from the orthopic viewing angle. There is an angle between the emitted light of the non-orthopic viewing angle and the orthopic viewing angle. Exemplarily, this angle may be within the range of (0°, 90°).

[0065] Specifically, by setting the light modulation layer on the thin film encapsulation layer, the light with a viewing angle of 0 to 30° can be diverged, so that the diverged light becomes the light within 30° to 60°, compensating for the problem that the light within 30° to 60° causes the brightness to decay as the viewing angle increases, thereby reducing the brightness difference of the light within the viewing angle range of 0 to 60° of the normal display panel (the brightness is more balanced). In addition, the light with an angle greater than 60° (for example, 60 to 90°) can be converged to an angle within the range of 30° to 60° to compensate for the problem that the light within 30° to 60° causes the brightness to decay as the viewing angle increases, thereby reducing the brightness difference of the light within the viewing angle range of 0 to 60° of the normal display panel (the brightness is more balanced).

[0066] The display panel in the present application includes a backplane, a pixel definition layer, a light emitting element, a thin film encapsulation layer and a light modulation layer, wherein the pixel definition layer is arranged on the backplane and has a first opening, the light emitting element is defined in the first opening, and the thin film encapsulation layer covers the pixel definition layer and the light emitting element; the light modulation layer is arranged on the thin film encapsulation layer, wherein the light modulation layer includes a first refractive index layer and a second refractive index layer with different refractive indices, and the interface between the first refractive index layer and the second refractive index layer includes a non-planar area, wherein the non-planar area is formed so that the brightness difference between the outgoing light of the normal viewing angle and the outgoing light of the non-normal viewing angle within the preset viewing angle range of the display panel is reduced. By setting the light modulation layer, especially the non-planar area, the brightness difference of the outgoing light between the normal viewing angle and the non-normal viewing angle within the preset viewing angle range is effectively reduced, so that when viewed from different angles, the brightness of the screen is more uniform, the consistency of the visual experience is improved, and the user's satisfaction is also improved. Embodiment 1

[0067] like Figure 1 As shown, the display panel includes a back panel 100;

[0068] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0069] A light emitting element 300 defined in the first opening 210;

[0070] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0071] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0072] The non-planar region 502 includes a first non-planar region 5021 , wherein at least part of the emitted light of the light emitting element 300 at a normal viewing angle is incident from the first refractive index layer 510 and is emitted from the first non-planar region 5021 to the second refractive index layer 520 .

[0073] In this embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and a first groove 801 is formed on the surface of the first refractive index layer 510 away from the back plate 100, wherein the orthographic projection of the first groove 801 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, and the interface at the first groove 801 constitutes a first non-planar area 5021.

[0074] In this embodiment, the first groove 801 is semi-ellipsoidal.

[0075] Specifically, if Figure 1 As shown, a semi-ellipsoidal first groove is formed on the first refractive index layer 510 directly above the first opening 210 by photolithography, and is leveled by the second refractive index layer 520. When the outgoing light of the normal viewing angle is incident on the non-planar area 5021, since the incident light enters the low refractive index layer from the high refractive index layer, the light will deviate from the normal direction, that is, a divergent light beam is formed, so that the outgoing light originally at the normal viewing angle is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the brightness of the light at other viewing angles.

[0076] In a specific embodiment, the opening width of the first opening 210 is equal to the width of the first groove 801 .

[0077] For example, Figure 1 As shown, the opening width of the first opening 210 can be defined as W, the refractive index of the first refractive index layer 510 in the optical modulation layer can be between 1.65 and 1.85, and the film thickness can be between 1.5um and 3um. The width of the semi-ellipsoidal first groove 801 formed is W1, wherein the difference between the width W1 of the first groove 801 and the width W of the first opening 210 can be between -2um and 8um, and the improvement effect is best when W1=W. At the same time, the depth of the first groove 801 can be defined as H1, H1 cannot exceed the thickness of the first refractive index layer 510, and the depth of the first groove 801 H1 can be between 1um and 2.5um.

[0078] The refractive index of the second refractive index layer 520 in the optical modulation layer can be between 1.45 and 1.55, and the thickness of the second refractive index layer 520 must be greater than the depth H1 of the first groove 801 to ensure that the second refractive index layer 520 can flow normally into the first groove 801. For example, the film thickness of the second refractive index layer 520 can be between 1.5um and 3um.

[0079] For example, taking green light as an example, the value of H1 is limited to 2um, and the improvement of brightness attenuation under different W1-W conditions is simulated under this structure. The simulation results are as follows: Figure 2 As shown, Figure 2 The horizontal axis is the viewing angle value, and the vertical axis is the brightness value. Under the optimal conditions, when the W1-W value is 0um, the degradation of the non-frontal viewing angle of 45° is reduced from 56.2% to 47.7%, an improvement of 8.5%. The degradation of the non-frontal viewing angle of 30° is reduced from 27.2% to 16.6%, an improvement of 10.6%. It can be seen that the display panel of the present application can effectively improve the problem of display brightness attenuation with the increase of viewing angle, achieve brightness balance within the preset viewing angle range, and improve user satisfaction. Embodiment 2

[0080] like Figure 3 As shown, the display panel includes a back panel 100;

[0081] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0082] A light emitting element 300 defined in the first opening 210;

[0083] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0084] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0085] The non-planar region 502 includes a first non-planar region 5021 , wherein at least part of the emitted light of the light emitting element 300 at a normal viewing angle is incident from the first refractive index layer 510 and is emitted from the first non-planar region 5021 to the second refractive index layer 520 .

[0086] In this embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and a first groove 801 is formed on the surface of the first refractive index layer 510 away from the back plate 100, wherein the orthographic projection of the first groove 801 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, and the interface at the first groove 801 constitutes a first non-planar region 5021.

[0087] In this embodiment, the first groove 801 is in an inverted trapezoidal shape, wherein the first groove 801 may penetrate the first refractive index layer 510 or may not penetrate the first refractive index layer 510 .

[0088] Specifically, if Figure 3 As shown, on the first refractive index layer 510, a first inverted trapezoidal groove 801 is formed by a photolithography process directly above the first opening 210, and is leveled by the second refractive index layer 520. When the outgoing light of the normal viewing angle is incident on the non-planar area 5021, since the incident light enters the low refractive index layer from the high refractive index layer, the light will deviate from the normal direction, that is, a divergent light beam is formed, so that the outgoing light originally at the normal viewing angle is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the brightness of the light at other viewing angles.

[0089] In a specific embodiment, the opening width of the first opening 210 is equal to the width of the first groove 801 .

[0090] For example, Figure 3 As shown, the opening width of the first opening 210 can be defined as W, the opening size of the first groove 801 can be defined as W1, the depth can be defined as H1, the slope angle can be defined as θ1, the thickness of the first refractive index layer can be defined as H, and the thickness of the first refractive index layer can be defined as greater than or equal to the depth H1 of the first groove 801. The refractive index of the first refractive index layer 510 can be between 1.65 and 1.85, and the thickness H of the film layer can be between 1.5um and 3um. The width of the upper base of the first groove 801 forming an inverted trapezoid is W1, and the difference between the width W1 and the opening width W of the first opening 210 can be between -4um and 4um. The closer W1 is to W, the more obvious the improvement effect is. The depth H1 of the first groove 801 can be between 1um and 3um. The refractive index Ln of the second refractive index layer 520 may be between 1.45 and 1.55, and the thickness of the second refractive index layer 520 must be greater than the depth H1 of the first inverted trapezoidal groove 801 to ensure that the second refractive index layer 520 can flow normally into the first groove 801. For example, the film thickness of the second refractive index layer 520 may be between 1.5um and 3.5um. The slope angle of the inverted trapezoid is θ1, and the smaller θ1 is, the longer the slope of the inverted trapezoid will be, so more light emitted from the front side of the light source will be incident on the slope and diverge to other viewing angles to improve the brightness degradation at other viewing angles, wherein θ1 may be between 30° and 60°. Embodiment 3

[0091] like Figure 4 As shown, the display panel includes a back panel 100;

[0092] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0093] A light emitting element 300 defined in the first opening 210;

[0094] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0095] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0096] The refractive index of the first refractive index layer 510 is smaller than that of the second refractive index layer 520 , and the first refractive index layer 510 is a right trapezoid, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100 , and the interface at the side of the right trapezoid constitutes a first non-planar region 5021 .

[0097] Specifically, if Figure 4 As shown, a regular trapezoidal pattern can be formed on the first refractive index layer 510 by a photolithography process, and is located directly above the first opening 210, and is leveled by the second refractive index layer 520. When the outgoing light of the normal viewing angle is incident on the first non-planar area 5021, since the incident light enters the high refractive index layer from the low refractive index layer, the light will move closer to the normal line after passing through the interface, that is, forming a divergent light beam, so that the outgoing light originally at the normal viewing angle is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the brightness of the light at other viewing angles.

[0098] In a specific embodiment, Figure 4 As shown, the opening width W of the first opening 210 is equal to the lower base width W1 of the regular trapezoid.

[0099] For example, the opening width of the first opening 210 can be defined as W, the thickness of the second refractive index layer 520 can be defined as H, the length of the lower side of the first refractive index layer can be defined as W1, the height can be defined as H1, and the slope angle can be defined as θ1. The refractive index of the first refractive index layer 510 can be between 1.45 and 1.55. The lower the refractive index, the stronger the light divergence ability, and the more obvious the improvement of brightness attenuation. The film thickness H1 of the first refractive index layer 510 can be between 1.5um and 3um.

[0100] The width of the bottom edge of the first refractive index layer 510 is W1, wherein the difference between the width W1 and the opening width W of the first opening 210 may be between -4um and 4um. When W1 is closer to W, the improvement effect of brightness attenuation is more obvious.

[0101] When θ1 is smaller or H1 is larger, the slope of the right trapezoid will be longer, so more light emitted from the light source at a normal viewing angle will be incident on the slope and diverge to other viewing angles to improve the brightness degradation at other viewing angles, wherein θ1 can be between 30° and 60°, and the thickness of H1 can be less than or equal to the thickness H of the second refractive index layer 520. The second refractive index layer 520 needs to level the first refractive index layer 510, so the thickness H of the second refractive index layer 520 can be between 2um and 5um. The refractive index of the second refractive index layer 520 can be between 1.65 and 1.85, and the larger its refractive index, the stronger the light divergence ability, and the more obvious the improvement of brightness attenuation will be. Embodiment 4

[0102] like Figure 5 As shown, the display panel includes a back panel 100;

[0103] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0104] A light emitting element 300 defined in the first opening 210;

[0105] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0106] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 with different refractive indices, and the interface between the first refractive index layer 510 and the second refractive index layer 520 includes a non-planar region 502 .

[0107] The refractive index of the first refractive index layer 510 is smaller than that of the second refractive index layer 520 , and the first refractive index layer 510 is semi-ellipsoidal, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100 , and the interface at the arc edge of the semi-ellipsoid constitutes a first non-planar region 5021 .

[0108] Specifically, if Figure 5 As shown, an upper semi-ellipsoidal pattern can be formed on the first refractive index layer 510 by a photolithography process, and is located directly above the first opening 210, and is leveled by the second refractive index layer 520. When the outgoing light of the normal viewing angle is incident on the first non-planar area 5021, since the incident light enters the high refractive index layer from the low refractive index layer, the light will move closer to the normal line after passing through the interface, that is, a divergent light beam is formed, so that the outgoing light originally at the normal viewing angle is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the brightness of the light at other viewing angles.

[0109] In a specific embodiment, Figure 5As shown, the opening width W of the first opening 210 is equal to the bottom width W1 of the semi-ellipsoid.

[0110] Exemplarily, the opening width of the first opening 210 can be defined as W, the thickness of the second refractive index layer 520 can be defined as H, and the height of the first refractive index layer can be defined as H1. The refractive index of the first refractive index layer 510 can be between 1.45 and 1.55. The lower the refractive index, the stronger the light divergence ability, and the more obvious the improvement in brightness attenuation will be. The film thickness H1 of the first refractive index layer 510 can be between 1.5um and 3um. The thickness H1 of the first refractive index layer 510 is not greater than the thickness H of the second refractive index layer 520, and the thicker the H1 film layer thickness, the stronger the divergence ability of the outgoing light at the normal viewing angle will be, and the stronger the ability to improve the brightness degradation at other viewing angles will be.

[0111] The bottom width of the upper semi-ellipsoid is W1. When W1 is equal to the opening size W of the first opening 210, the improvement effect on brightness attenuation is more obvious. When the difference between the width W1 and the opening width W of the first opening 210 is between -4um and 4um, the brightness degradation at other viewing angles is significantly improved.

[0112] The upper semi-ellipsoidal shape formed by the first refractive index layer 510 is leveled by the second refractive index layer 520, so the thickness H of the second refractive index layer 520 must be greater than the thickness of the first refractive index layer 510, the thickness of the second refractive index layer 520 can be between 2um and 5um, and the refractive index of the second refractive index layer 520 can be between 1.65 and 1.85, and the larger the refractive index of the second refractive index layer 520, the stronger the light divergence ability, and the more obvious the improvement of brightness attenuation. Embodiment 5

[0113] like Figure 6 As shown, the display panel includes a back panel 100;

[0114] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0115] A light emitting element 300 defined in the first opening 210;

[0116] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0117] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0118] In a specific embodiment, the non-planar region 502 includes a second non-planar region 5022 , and the emitted light of the light emitting element 300 at a non-normal viewing angle is converged at the second non-planar region 5022 .

[0119] The non-normal viewing angle output light refers to light that deviates from the normal viewing angle output light of the light emitting element 300 at an angle. For example, the output light at 60° to 90° can be used as an example of the non-normal viewing angle output light.

[0120] In a specific embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and the first refractive index layer 510 is a right trapezoid, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, the interface at the side of the right trapezoid constitutes a second non-planar area 5022, and the opening width of the first opening 201 is smaller than the lower base width of the right trapezoid.

[0121] like Figure 6 As shown, the light emitted from the front side can still be emitted vertically through the positive trapezoid formed by the high refractive index photolithography layer. When the emitted light at a non-normal viewing angle is incident on the second non-planar area 5022, the light enters the low folding layer from the high folding layer and deviates from the normal line, that is, deflects to a smaller angle.

[0122] For example, in order to optimize the brightness attenuation at 45°, more light at a larger angle (for example, 60° to 90°) must be allowed to be incident on the interface. The wider the width of W2, the easier it is for the light at a larger angle to be incident on the second non-planar area 5022. Therefore, the lower base W2 of the right trapezoid must be as wide as possible, while also ensuring that the light emitted from the front can directly penetrate the right trapezoid and be emitted.

[0123] If the width of W2 is not enough, more light with small angles (for example, 0° to 30°) will be incident on this interface and deflected to a smaller angle, thereby accelerating the attenuation of the brightness of small-angle light. Therefore, the difference W2-W between the width of W2 and the opening width W of the first opening 210 can be between 14um and 20um, the height H1 of the first refractive index layer 510 can be between 1.5um and 3um, the refractive index Hn of the first refractive index layer 510 can be between 1.65 and 1.85, and the height H1 of the first refractive index layer 510 is not higher than the thickness H2 of the second refractive index layer. Generally, the thickness H2 of the second refractive index layer can be proportional to the width difference of W2-W, that is, the larger the width difference, the thicker H2 can be made.

[0124] The slope angle θ2 can be between 65° and 85°. If the slope angle θ2 is smaller, more small-angle light will be incident on the slope and deflected to a smaller angle. Therefore, in order to prevent 45° light from being incident on the second non-planar area 5022, the slope angle θ2 should not be too small. The second refractive index layer 520 must level the formed positive trapezoid, so the thickness of the second refractive index layer 520 can be between 3um and 5um, and the refractive index of the second refractive index layer 520 can be between 1.45 and 1.55.

[0125] For example, taking green light as an example, the thickness H1 of the first refractive index layer is 2um, θ2 is 70°, and W2-W is a variable for simulation. The simulation results are as follows: Figure 7 As shown, Figure 7 The horizontal axis is the viewing angle value, and the vertical axis is the brightness value. When W2-W is 14um, the brightness attenuation at 30° is improved from 27.2% degradation to 20.2%, an optimization of 7%; the brightness attenuation at 45° is improved from 56.2% degradation to 55%, an optimization of 1.2%. When W2-W is 18um, the brightness attenuation at 30° is improved from 27.2% degradation to 24.8%, an optimization of 2.4%; the brightness attenuation at 45° is improved from 56.2% degradation to 50.7%, an optimization of 5.5%. It can also be seen from the simulation results that when the opening of W2 becomes smaller, the brightness degradation at a smaller viewing angle will be optimized. When W2 is further reduced, the brightness at 45° will be degraded to further improve the brightness of the front. Embodiment 6

[0126] like Figure 8 As shown, the display panel includes a back panel 100;

[0127] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0128] A light emitting element 300 defined in the first opening 210;

[0129] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0130] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0131] In a specific embodiment, the non-planar region 502 includes a first non-planar region 5021 and a second non-planar region 5022, wherein at least part of the outgoing light of the light-emitting element 300 at a normal viewing angle is incident from the first refractive index layer 510, and is diverged at the first non-planar region 5021 and emitted into the second refractive index layer 520; and the outgoing light of the light-emitting element 300 at a non-normal viewing angle is converged at the second non-planar region 5022.

[0132] The outgoing light at the normal viewing angle refers to the light that emerges at the normal viewing angle.

[0133] The non-normal viewing angle output light refers to light that deviates at an angle from the normal viewing angle light of the light emitting element 300. For example, the output light of 60° to 90° can be used as an example of the non-normal viewing angle output light.

[0134] In a specific embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and the first refractive index layer 510 is a right trapezoid having a second groove 802, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 201 on the back plate 100, and the interface at the side of the right trapezoid constitutes a second non-planar area 5022, and the opening width of the first opening 201 is smaller than the lower base width of the right trapezoid; the orthographic projection of the second groove 802 on the back plate 100 is aligned with the orthographic projection of the first opening 201 on the back plate 100, and the interface at the second groove 802 constitutes the first non-planar area 5021.

[0135] In a specific embodiment, the second groove 802 is semi-ellipsoidal.

[0136] In a specific embodiment, the opening width of the first opening 201 is equal to the width of the second groove 802 .

[0137] Specifically, when the light emitted from the front enters the first non-planar region 5021, since the incident light enters the low refractive index layer from the high refractive index layer, the light will deviate from the normal direction, that is, form a divergent beam, so that the light originally emitted from the front is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the brightness of the light emitted at other viewing angles. For the light emitted at a large viewing angle (for example, 60° to 90°), when it enters the second non-planar region 5022, the light enters the low refractive index layer from the high refractive index layer and deviates from the normal, that is, deflects to a smaller angle, forming the original light emitted from the front and the light emitted from the large viewing angle under this structure, both of which are deflected to the intermediate viewing angle (for example, 30° to 60°), which can effectively improve the brightness attenuation at the intermediate viewing angle.

[0138] Specific as Figure 8As shown, a second groove in a lower semi-ellipsoidal shape is formed on the upper surface of the regular trapezoid by photolithography, and the second groove 802 is also located directly above the first opening 201 . Finally, the first refractive index layer 501 is leveled by the second refractive index layer 502 .

[0139] Exemplarily, the opening width of the first opening 210 can be defined as W, the lower surface width of the regular trapezoid is W2, the height is H2, the slope angle is θ2, the length of the semi-ellipsoidal groove is W1, and the depth is H1. In order to allow more large-angle light to be incident on the second non-planar area 5022, the width of the lower base W2 of the regular trapezoid must be as large as possible. If the width of W2 is small, the angle of the light incident on the second non-planar area 5022 is small, which will accelerate the attenuation of the brightness of the small angle light, which is not conducive to the optimization of the brightness attenuation of the small angle viewing angle. Therefore, the difference W2-W between the width of W2 and the opening width W of the first opening 210 can be between 14um and 20um, the height H2 of the first refractive index layer 510 can be between 1.5um and 3um, the thickness H of the second refractive index layer can be between 1.5um and 3um, the thickness of H2 is not higher than the thickness of H, and the larger H2 is, the more light can be incident on the second non-planar area 5022. Generally, the thickness of H2 may be proportional to the width difference of W2-W, that is, the greater the width difference, the thicker H2 may be.

[0140] The slope angle θ2 can be between 65° and 85°, and the slope angle θ2 cannot be too small. The smaller the slope angle, the more small-angle light will be incident on the slope and deflected to a smaller angle. Therefore, to avoid 45° light from being incident on the interface, θ2 should not be too small.

[0141] The width of the formed semi-ellipsoidal groove is W1, and the difference between the width W1 and the opening width W of the first opening 210 can be between -2um and 8um, and the improvement effect of brightness attenuation is best when W1=W. The depth H1 of the semi-ellipsoidal groove should be less than or equal to the thickness H2 of the first refractive index layer 510, and the depth H1 of the semi-ellipsoidal groove can be between 1um and 2.5um. The refractive index Hn of the first refractive index layer 510 can be between 1.65 and 1.85, and the refractive index Ln of the second refractive index layer 520 can be between 1.45 and 1.55. The thickness of the second refractive index layer 520 must be greater than the thickness H2 of the regular trapezoid to ensure that the first refractive index layer 510 can be leveled normally, and the film thickness of the second refractive index layer 520 can be between 3um and 5um. Embodiment 7

[0142] like Fig. 9 As shown, the display panel includes a back panel 100;

[0143] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0144] A light emitting element 300 defined in the first opening 210;

[0145] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0146] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0147] In a specific embodiment, the non-planar region 502 includes a first non-planar region 5021 and a second non-planar region 5022, wherein at least part of the outgoing light of the light-emitting element 300 at a normal viewing angle is incident from the first refractive index layer 510, and is diverged at the first non-planar region 5021 and emitted into the second refractive index layer 520; and the outgoing light of the light-emitting element 300 at a non-normal viewing angle is converged at the second non-planar region 5022.

[0148] The outgoing light at the normal viewing angle refers to the light that emerges at the normal viewing angle.

[0149] The non-normal viewing angle output light refers to light that deviates at an angle from the normal viewing angle light of the light emitting element 300. For example, the output light of 60° to 90° can be used as an example of the non-normal viewing angle output light.

[0150] In a specific embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and the first refractive index layer 510 is a right trapezoid having a second groove 802, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 201 on the back plate 100, and the interface at the side of the right trapezoid constitutes a second non-planar area 5022, and the opening width of the first opening 201 is smaller than the lower base width of the right trapezoid; the orthographic projection of the second groove 802 on the back plate 100 is aligned with the orthographic projection of the first opening 201 on the back plate 100, and the interface at the second groove 802 constitutes the first non-planar area 5021.

[0151] In a specific embodiment, the second groove 802 is in an inverted trapezoidal shape.

[0152] In a specific implementation, the second groove 802 is in an inverted trapezoidal shape and the second groove 802 penetrates the first refractive index layer 510 .

[0153] In a specific embodiment, the opening width of the first opening 201 is equal to the width of the second groove 802 .

[0154] Specifically, when the light emitted from the front enters the first non-planar region 5021, since the incident light enters the low refractive index layer from the high refractive index layer, the light will deviate from the normal direction, that is, form a divergent beam, so that the light originally emitted from the front is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the brightness of the light emitted at other viewing angles. For the light emitted at a large viewing angle (for example, 60° to 90°), when it enters the second non-planar region 5022, the light enters the low refractive index layer from the high refractive index layer and deviates from the normal, that is, deflects to a smaller angle, forming the original light emitted from the front and the light emitted from the large viewing angle under this structure, both of which are deflected to the intermediate viewing angle (for example, 30° to 60°), which can effectively improve the brightness attenuation at the intermediate viewing angle.

[0155] Specific as Fig. 9 As shown, a second inverted trapezoidal groove 802 is formed on the upper surface of the regular trapezoid by photolithography, and the second groove 802 is also located directly above the first opening 201 . Finally, the first refractive index layer 501 is leveled by the second refractive index layer 502 .

[0156] Exemplarily, the opening width of the first opening 210 may be defined as W, the lower surface width of the regular trapezoid may be defined as W2, the height may be defined as H, and the slope angle may be defined as θ2, and the length of the inverted trapezoidal groove may be defined as W1, the depth may be defined as H1, and the slope angle may be defined as θ1. In order to allow more light at large angles to be incident on the second non-planar region 5022, the width of the lower base W2 of the regular trapezoid must be as large as possible. If the width of W2 is small, the angle of the light incident on the second non-planar region 5022 is small, which will accelerate the attenuation of the brightness of the small angle, which is not conducive to the optimization of the brightness attenuation of the small angle viewing angle. Therefore, the difference W2-W between the width of W2 and the opening width W of the first opening 210 can be between 14um and 20um, the height H2 of the inverted trapezoidal groove can be between 1.5um and 3um, the thickness H of the first refractive index layer 510 can be between 2um and 3.5um, the thickness H of the first refractive index layer is not less than the height H2 of the inverted trapezoidal groove, and the larger H2 is, the more light can be incident on the second non-planar region 5022. Generally, the thickness of H2 can be proportional to the width difference of W2-W, that is, the larger the width difference is, the thicker H2 can be.

[0157] The slope angle θ2 can be between 65° and 85°, and the slope angle θ2 cannot be too small. The smaller the slope angle, the more small-angle light will be incident on the slope and deflected to a smaller angle. Therefore, to avoid 45° light from being incident on the interface, θ2 should not be too small.

[0158] The width of the upper bottom side of the formed inverted trapezoidal groove is W1, and the difference between the width W1 and the opening width W of the first opening 210 can be between -4um and 4um, and the improvement effect of brightness attenuation is best when W1=W. The refractive index Ln of the second refractive index layer 520 can be between 1.45 and 1.55, and the thickness of the second refractive index layer 520 must be greater than the depth H1 of the inverted trapezoidal groove to ensure that the layer can be leveled normally. The film thickness of the second refractive index layer 520 can be between 3um and 5um. The slope angle of the inverted trapezoid is θ1. When θ1 is larger, the slope of the inverted trapezoid will be longer, so there will be more light emitted from the front of the light source incident on the slope and diverging to other viewing angles to improve the brightness degradation at other viewing angles, where θ1 can be between 120° and 150°. Embodiment 8

[0159] like Fig.10 As shown, the display panel includes a back panel 100;

[0160] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0161] A light emitting element 300 defined in the first opening 210;

[0162] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0163] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0164] In a specific embodiment, the non-planar region 502 includes a first non-planar region 5021 and a second non-planar region 5022, wherein at least part of the outgoing light of the light-emitting element 300 at a normal viewing angle is incident from the first refractive index layer 510, and is diverged at the first non-planar region 5021 and emitted into the second refractive index layer 520; and the outgoing light of the light-emitting element 300 at a non-normal viewing angle is converged at the second non-planar region 5022.

[0165] The outgoing light at the normal viewing angle refers to the light that emerges at the normal viewing angle.

[0166] The non-normal viewing angle output light refers to light that deviates at an angle from the normal viewing angle light of the light emitting element 300. For example, the output light of 60° to 90° can be used as an example of the non-normal viewing angle output light.

[0167] In a specific embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and the first refractive index layer 510 as a whole is a semi-ellipsoid with a third groove 803, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, the width of the bottom surface of the semi-ellipsoid is greater than the opening width of the first opening 210, and the interface at the arc edge of the semi-ellipsoid constitutes the second non-planar area 5022; the orthographic projection of the third groove 803 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, and the interface at the third groove 803 constitutes the first non-planar area 5021.

[0168] In a specific embodiment, the third groove is semi-ellipsoidal.

[0169] In a specific embodiment, the opening width of the first opening 210 is equal to the width of the third groove 803 .

[0170] Specifically, if Fig.10 As shown, the first refractive index layer 510 is first formed into an upper semi-ellipsoidal pattern located directly above the first opening 210 by a photolithography process, and then a lower semi-ellipsoidal third groove 803 is formed on the upper semi-ellipsoidal pattern by a photolithography process, and the third groove 803 is located directly above the first opening 210, and finally leveled by the second refractive index layer 520. When the light emitted from the front is incident on the first non-planar area 5021, since the incident light enters the low refractive index layer from the high refractive index layer, the light will deviate from the normal direction, that is, a divergent light beam is formed, so that the light originally emitted from the front is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the light brightness at other viewing angles. For light emitted at a large viewing angle (for example, 60° to 90°), when it enters the second non-planar area 5022, the light will deviate from the normal when entering the low refractive index layer from the high refractive index layer, that is, it will be deflected to a smaller angle, resulting in the original front-emitting light and the light emitted at a large viewing angle being deflected to an intermediate viewing angle (for example, 30° to 60°) under this structure, which can effectively improve the brightness attenuation at the intermediate viewing angle.

[0171] like Fig.11 It can be used as a schematic diagram of pixel arrangement of the display panel along the AA′ cross section of this embodiment.

[0172] The opening width of the first opening 210 is defined as W, the lower surface width of the first refractive index layer 510 is defined as W2, the height is defined as H2, and the width of the third groove 803 is defined as W1, and the depth is defined as H1. The difference between the width W1 of the third groove 803 and the width W of the first opening 201 can be between -2um and 8um, and the improvement effect on brightness attenuation is best when W1=W. The depth of the third groove 803 can be between 1um and 2.5um.

[0173] In order to allow more light at a large angle to be incident on the non-planar region 502, the lower surface width W2 of the first refractive index layer 510 should be as large as possible, W2 is greater than the width W1 of the third groove 803, the difference W2-W between the lower surface width W2 of the first refractive index layer 510 and the opening width W of the first opening 201 can be between 14um and 20um, the height H2 of the first refractive index layer 510 can be between 1.5um and 3um, and the height H2 of the first refractive index layer 510 is greater than the depth H1 of the third groove 803. The refractive index Hn of the first refractive index layer 510 can be between 1.65 and 1.85, the refractive index Ln of the second refractive index layer 520 can be between 1.45 and 1.55, and the thickness of the second refractive index layer 520 can be between 3um and 5um, so as to ensure that the first refractive index layer 510 can be leveled normally. Embodiment 9

[0174] like Fig.12 As shown, the display panel includes a back panel 100;

[0175] The pixel definition layer 200 disposed on the back plate 100 has a first opening 210;

[0176] A light emitting element 300 defined in the first opening 210;

[0177] A thin film encapsulation layer 400 covering the pixel definition layer 200 and the light emitting element 300;

[0178] The light modulation layer 500 is disposed on the thin film encapsulation layer 400 , wherein the light modulation layer 500 includes a first refractive index layer 510 and a second refractive index layer 520 having different refractive indices, and an interface between the first refractive index layer 510 and the second refractive index layer 520 includes a planar region 501 and a non-planar region 502 .

[0179] In a specific embodiment, the non-planar region 502 includes a first non-planar region 5021 and a second non-planar region 5022, wherein at least part of the outgoing light of the light-emitting element 300 at a normal viewing angle is incident from the first refractive index layer 510, and is diverged at the first non-planar region 5021 and emitted into the second refractive index layer 520; and the outgoing light of the light-emitting element 300 at a non-normal viewing angle is converged at the second non-planar region 5022.

[0180] The outgoing light at the normal viewing angle refers to the light that emerges at the normal viewing angle.

[0181] The non-normal viewing angle output light refers to light that deviates at an angle from the normal viewing angle light of the light emitting element 300. For example, the output light of 60° to 90° can be used as an example of the non-normal viewing angle output light.

[0182] In a specific embodiment, the refractive index of the first refractive index layer 510 is greater than the refractive index of the second refractive index layer 520, and the first refractive index layer 510 as a whole is a semi-ellipsoid with a third groove 803, wherein the orthographic projection of the first refractive index layer 510 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, the width of the bottom surface of the semi-ellipsoid is greater than the opening width of the first opening 210, and the interface at the arc edge of the semi-ellipsoid constitutes the second non-planar area 5022; the orthographic projection of the third groove 803 on the back plate 100 is aligned with the orthographic projection of the first opening 210 on the back plate 100, and the interface at the third groove 803 constitutes the first non-planar area 5021.

[0183] In a specific embodiment, the third groove 803 is in an inverted trapezoidal shape.

[0184] In a specific implementation, the third groove 803 is in an inverted trapezoidal shape and the third groove 803 penetrates the first refractive index layer 510 .

[0185] In a specific embodiment, the opening width of the first opening 210 is equal to the width of the third groove 803 .

[0186] Specifically, if Fig.12 As shown, the first refractive index layer 510 is first formed into an upper semi-ellipsoidal pattern located directly above the first opening 210 by a photolithography process, and then a third inverted trapezoidal groove 803 is formed on the upper semi-ellipsoidal pattern by a photolithography process, and the third groove 803 is located directly above the first opening 210, and finally leveled by the second refractive index layer 520. When the light emitted from the front is incident on the first non-planar area 5021, since the incident light enters the low refractive index layer from the high refractive index layer, the light will deviate from the normal direction, that is, a divergent light beam is formed, so that the light originally emitted from the front is dispersed to other viewing angles (for example, 30° to 60°), thereby improving the attenuation of the light brightness at other viewing angles. For light emitted at a large viewing angle (for example, 60° to 90°), when it enters the second non-planar area 5022, the light will deviate from the normal when entering the low refractive index layer from the high refractive index layer, that is, it will be deflected to a smaller angle, resulting in the original front-emitting light and the light emitted at a large viewing angle being deflected to an intermediate viewing angle (for example, 30° to 60°) under this structure, which can effectively improve the brightness attenuation at the intermediate viewing angle.

[0187] The opening width of the first opening 210 is defined as W, the lower surface width of the first refractive index layer 510 is defined as W2, the height is defined as H2, the long side opening of the third groove 803 is defined as W1, the depth is defined as H1, and the slope angle is defined as θ1. The difference between the width W1 of the third groove 803 and the width W of the first opening 201 can be between -2um and 8um, and the improvement effect on brightness attenuation is best when W1=W. The depth of the third groove 803 can be between 1um and 2.5um.

[0188] In order to allow more light at a large angle to be incident on the non-planar region 502, the lower surface width W2 of the first refractive index layer 510 should be as large as possible, W2 is greater than the width W1 of the third groove 803, the difference W2-W between the lower surface width W2 of the first refractive index layer 510 and the opening width W of the first opening 201 can be between 14um and 20um, the height H2 of the first refractive index layer 510 can be between 1um and 2.5um, and the height H2 of the first refractive index layer 510 can be greater than or equal to the depth H1 of the third groove 803. The refractive index Hn of the first refractive index layer 510 can be between 1.65 and 1.85, the refractive index Ln of the second refractive index layer 520 can be between 1.45 and 1.55, and the thickness of the second refractive index layer 520 can be between 3um and 5um, so as to ensure that the first refractive index layer 510 can be leveled normally.

[0189] In addition, if Figure 1 , Figure 3 to Figure 6 , Figure 8 to Figure 10 and Fig.12 As shown, the thin film encapsulation layer 400 may include a first inorganic encapsulation layer 410, an organic encapsulation layer 420 and a second inorganic encapsulation layer 430. The first inorganic encapsulation layer 410 is the first layer in the encapsulation structure, located above the pixel defining layer 200 and away from the backplane 100. Its main function is to provide mechanical strength and barrier function to prevent harmful substances such as moisture and oxygen from invading the display area, thereby extending the life of the display element. The inorganic encapsulation layer is usually made of silicate, silicon nitride or other inorganic materials, and has excellent barrier properties and chemical stability.

[0190] The organic encapsulation layer 420 covers the first inorganic encapsulation layer 410 and is the middle layer in the encapsulation structure. Compared with the inorganic encapsulation layer, the organic encapsulation layer 420 generally has better flexibility and lower stress, and can adapt to more complex curved surfaces and flexible display requirements. The organic encapsulation layer 420 is generally made of polymer materials, such as epoxy resin, polyimide, etc.

[0191] The second inorganic encapsulation layer 430 is the last layer in the encapsulation structure and is located above the organic encapsulation layer 420. Similar to the first inorganic encapsulation layer 410, the second inorganic encapsulation layer 430 also provides mechanical strength and barrier function, further protecting the display area from harmful substances. The combination of two inorganic encapsulation layers and an organic encapsulation layer can significantly improve the barrier performance and reliability of the encapsulation structure.

[0192] like Figure 1 , Figure 3 to Figure 6 , Figure 8 to Figure 10 and Fig.12 As shown, the display panel further includes a touch layer 600 disposed between the thin film encapsulation layer 400 and the light modulation layer 500 . Specifically, the touch layer 600 may be disposed between the second inorganic encapsulation layer 430 and the first refractive index layer 510 .

[0193] like Figure 1 , Figure 3 to Figure 6 , Figure 8 to Figure 10 and Fig.12 As shown, the display panel further includes a cover plate 700 disposed on the light modulation layer 500 . Specifically, the cover plate 700 may be disposed on the second refractive index layer 520 .

[0194] The present application is applicable to display panels with any pixel arrangement, for example, including but not limited to any RGB pixel arrangement such as Diamond-like pixel arrangement, GGRB pixel arrangement, Real RGB pixel arrangement, etc.

[0195] In addition, the present application also provides a display device, which includes the display panel in the aforementioned embodiment.

[0196] In addition, if Fig.13 As shown, the present application also provides a method for manufacturing a display panel.

[0197] The method for manufacturing the display panel in the embodiment of the present application can be implemented through the following steps S101 to S104.

[0198] Step S101: forming a pixel definition layer on a backplane, wherein the pixel definition layer has a first opening.

[0199] Step S102: forming a light-emitting element in the first opening.

[0200] Step S103: forming a thin film encapsulation layer to cover the pixel definition layer and the light emitting element.

[0201] Step S104: forming a light modulation layer on the thin film encapsulation layer, wherein the light modulation layer comprises a first refractive index layer and a second refractive index layer having different refractive indices, and an interface between the first refractive index layer and the second refractive index layer comprises a planar area and a non-planar area, wherein the non-planar area is formed so that a brightness difference between an outgoing light at a normal viewing angle and an outgoing light at a non-normal viewing angle is reduced within a preset viewing angle range of the display panel, wherein the outgoing light at the non-normal viewing angle deviates at an angle relative to the outgoing light at the normal viewing angle.

[0202] Based on the above steps S101 to S104, by setting a light modulation layer, the brightness difference of the emitted light between the normal viewing angle and the non-normal viewing angle within the preset viewing angle range is effectively reduced, so that the brightness of the screen is more uniform when viewed from different angles, thereby improving the consistency of the visual experience and user satisfaction.

[0203] So far, the technical solutions of the present application have been described in conjunction with the specific implementations shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific implementations. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A display panel, comprising: Back panel; A pixel defining layer disposed on the backplane, having a first opening; a light emitting element defined in the first opening; A thin film encapsulation layer, covering the pixel definition layer and the light emitting element; A light modulation layer is arranged on the thin film encapsulation layer, wherein the light modulation layer includes a first refractive index layer and a second refractive index layer with different refractive indices, and the interface between the first refractive index layer and the second refractive index layer includes a non-planar area, wherein the non-planar area is formed so that the brightness difference between the output light of the normal viewing angle and the output light of the non-normal viewing angle within the preset viewing angle range of the display panel is reduced, and the output light of the non-normal viewing angle deviates at an angle relative to the output light of the normal viewing angle.

2. The display panel according to claim 1, characterized in that: The non-planar region includes a first non-planar region, wherein at least part of the emitted light of the light emitting element at a normal viewing angle is incident from the first refractive index layer and is diverged and emitted into the second refractive index layer at the first non-planar region.

3. The display panel according to claim 2, characterized in that: The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer, and a first groove is formed on the surface of the first refractive index layer away from the back plate, wherein the orthographic projection of the first groove on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the first groove constitutes the first non-planar area.

4. The display panel according to claim 3, characterized in that: The first groove is in a semi-ellipsoidal shape or an inverted trapezoidal shape.

5. The display panel according to claim 4, characterized in that: The opening width of the first opening is equal to the width of the first groove.

6. The display panel according to claim 2, characterized in that: The refractive index of the first refractive index layer is smaller than the refractive index of the second refractive index layer, and the first refractive index layer is a regular trapezoid, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the side of the regular trapezoid constitutes the first non-planar area.

7. The display panel according to claim 6, characterized in that: The opening width of the first opening is equal to the lower base width of the regular trapezoid.

8. The display panel according to claim 2, characterized in that: The refractive index of the first refractive index layer is smaller than that of the second refractive index layer, and the first refractive index layer is semi-ellipsoidal, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the arc edge of the semi-ellipsoid constitutes the first non-planar area.

9. The display panel according to claim 8, characterized in that: The opening width of the first opening is equal to the bottom width of the semi-ellipsoid.

10. The display panel according to claim 1, characterized in that: The non-planar region includes a second non-planar region, and the emitted light of the light emitting element at a non-normal viewing angle is converged at the second non-planar region.

11. The display panel according to claim 10, characterized in that: The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer, and the first refractive index layer is a regular trapezoid, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, the interface at the side of the regular trapezoid constitutes the second non-planar area, and the opening width of the first opening is smaller than the width of the lower base of the regular trapezoid.

12. The display panel according to claim 1, characterized in that: The non-planar region includes a first non-planar region and a second non-planar region, Among them, at least part of the output light of the light-emitting element at a normal viewing angle is incident from the first refractive index layer, and is diverged and emitted into the second refractive index layer at the first non-planar area; the output light of the light-emitting element at a non-normal viewing angle is converged at the second non-planar area.

13. The display panel according to claim 12, characterized in that: The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer, The first refractive index layer is a regular trapezoid with a second groove as a whole, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, the interface at the side of the regular trapezoid constitutes the second non-planar area, and the opening width of the first opening is smaller than the lower base width of the regular trapezoid; The orthographic projection of the second groove on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the second groove constitutes the first non-planar area.

14. The display panel according to claim 13, characterized in that: The second groove is in a semi-ellipsoidal shape or an inverted trapezoidal shape.

15. The display panel according to claim 14, characterized in that: The second groove is in an inverted trapezoidal shape and penetrates the first refractive index layer.

16. The display panel according to any one of claims 13 to 15, characterized in that: An opening width of the first opening is equal to a width of the second groove.

17. The display panel according to claim 12, characterized in that: The refractive index of the first refractive index layer is greater than the refractive index of the second refractive index layer, The first refractive index layer is in the shape of a semi-ellipsoid with a third groove as a whole, wherein the orthographic projection of the first refractive index layer on the back plate is aligned with the orthographic projection of the first opening on the back plate, the width of the bottom surface of the semi-ellipsoid is greater than the opening width of the first opening, and the interface at the arc edge of the semi-ellipsoid constitutes the second non-planar area; The orthographic projection of the third groove on the back plate is aligned with the orthographic projection of the first opening on the back plate, and the interface at the third groove constitutes the first non-planar area.

18. The display panel according to claim 17, characterized in that: The third groove is in a semi-ellipsoidal shape or an inverted trapezoidal shape.

19. The display panel according to claim 18, characterized in that: The third groove is in an inverted trapezoidal shape and passes through the first refractive index layer; and / or The opening width of the first opening is equal to the width of the third groove.

20. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1-19.

Images