Display panel and display device

Abstract

The embodiments of the present application provide a display panel and a display device. The display panel includes a first light-emitting element, a first bonding layer, a second light-emitting element, a second light-emitting element, a second bonding layer, and a third light-emitting element and a grating pattern, wherein the grating pattern is at least arranged in the first bonding layer or the second bonding layer. The grating pattern includes two oppositely arranged sub-grating layers. By arranging the above-mentioned grating patterns in different bonding layers, when light passes through different sub-grating layers, it will be acted upon by different sub-grating layers in turn, thereby converging or gathering the light emitted by the light-emitting element, thereby reducing the problem of divergence of the emitted light, and effectively improving the light extraction rate and utilization efficiency of the light in the display area, while achieving the purpose of improving the display effect of the panel.

Description

Technical Field

[0001] The present invention relates to the technical field of design and manufacturing of display panels, and in particular to a display panel and a display device. Background Art

[0002] With the continuous development of display panel manufacturing technology, people have put forward higher requirements on the quality and display performance of display panels.

[0003] To further improve the luminous performance of display panels, silicon-based (Si) circuit substrate materials are currently used as substrates, and Si-uLED light-emitting devices are further formed thereon. Compared to traditional light-emitting devices, Si-uLEDs have attracted attention due to their smaller size and higher brightness. However, in the prior art, when preparing and forming such light-emitting devices, due to the small size of Si-uLEDs, when these smaller Si-uLEDs are vertically stacked to form a device structure with better full-color display performance, a size effect occurs. That is, as the pixel size decreases, the pixel side area and opening area increase, which in turn significantly reduces the luminous efficiency of the light-emitting device. For example, when preparing a vertically stacked full-color panel, the vertical stacking structure design results in a relatively thick film layer after stacking. With such a large thickness, the propagation path and direction of the light from the display panel during light display are relatively divergent. For example, light scattering is severe in the center of the light emission area, and light divergence and scattering angles are large at the edges, resulting in severe losses, which is not conducive to further improving the display effect of the display panel.

[0004] In summary, in the prior art, when preparing and forming a silicon-based display panel light-emitting device, the light in the silicon-based light-emitting device is severely divergent, and the light emission angle and light emission effect are not ideal. Summary of the Invention

[0005] Embodiments of the present invention provide a display panel and a display device to effectively improve the problem of relatively divergent light and low light utilization rate in conventional display panels during luminous display.

[0006] To solve the above technical problems, a first aspect of an embodiment of the present invention provides a display panel, comprising: a light-emitting device formed on a circuit substrate, the light-emitting device comprising at least:

[0007] A first light-emitting element is provided on the circuit substrate;

[0008] a first bonding layer, disposed on the first light-emitting element;

[0009] a second light-emitting element, disposed on the first bonding layer and electrically connected to the first light-emitting element;

[0010] a second bonding layer, disposed on the second light-emitting element;

[0011] a third light-emitting element, disposed on the second bonding layer; and

[0012] The grating pattern is at least arranged in the first bonding layer or the second bonding layer and on the light emitting path above the first light emitting element. The grating pattern includes two oppositely arranged sub-grating layers.

[0013] According to an embodiment of the present invention, the refractive indices of the two sub-grating layers corresponding to the grating pattern are different.

[0014] According to an embodiment of the present invention, the grating pattern includes a first grating group disposed in the first bonding layer, and a second grating group disposed in the second bonding layer;

[0015] The first grating group includes a first sub-grating layer arranged on a side close to the first light-emitting element, and a second sub-grating layer arranged on a side away from the first light-emitting element;

[0016] The second grating group includes a third sub-grating layer arranged on the second light-emitting element, and a fourth sub-grating layer arranged on a side away from the second light-emitting element.

[0017] According to an embodiment of the present invention, the patterned structure of the first sub-grating layer is the same as that of the third sub-grating layer, and the patterned structure of the second sub-grating layer is the same as that of the fourth sub-grating layer.

[0018] According to an embodiment of the present invention, the first sub-grating layer, the second sub-grating layer, the third sub-grating layer, and the fourth sub-grating layer are all configured as blazed gratings.

[0019] According to an embodiment of the present invention, the patterned structure of the first sub-grating layer and the patterned structure of the second sub-grating layer are arranged in a staggered manner, and the patterned structure of the third sub-grating layer and the patterned structure of the fourth sub-grating layer are arranged in a staggered manner.

[0020] According to an embodiment of the present invention, the grooves of the blazed grating corresponding to the first sub-grating layer correspond to the grating planes of the second sub-grating layer, and the grating planes of the blazed grating corresponding to the first sub-grating layer correspond to the grooves of the second sub-grating layer;

[0021] Furthermore, the grooves of the blazed grating corresponding to the third sub-grating layer correspond to the grating planes of the fourth sub-grating layer.

[0022] According to an embodiment of the present invention, the refractive index of the first sub-grating layer is greater than the refractive index of the second sub-grating layer, and the refractive index of the third sub-grating layer is less than the refractive index of the fourth sub-grating layer;

[0023] Alternatively, the refractive index of the first sub-grating layer is smaller than the refractive index of the second sub-grating layer, and the refractive index of the third sub-grating layer is larger than the refractive index of the fourth sub-grating layer.

[0024] According to an embodiment of the present invention, the grating structure corresponding to the grating pattern includes a blaze angle θ, a grating width d, a wavelength of light λ, and an interference level of the grating pattern m;

[0025] The above parameters satisfy the following relationship: 2dsinθ=mλ.

[0026] According to a second aspect of the embodiments of the present invention, a display device is further provided. The display device includes the display panel provided in the embodiments of the present application.

[0027] Beneficial effects of the embodiments of the present invention: Compared with the prior art, the embodiments of the present application provide a display panel and a display device. The display panel includes a first light-emitting component, a first bonding layer, a second light-emitting component, a second light-emitting component, a second bonding layer, and a third light-emitting component and a grating pattern, and the grating pattern is at least arranged in the first bonding layer or the second bonding layer. And the grating pattern includes two oppositely arranged sub-grating layers. By arranging the above-mentioned grating patterns in different bonding layers, when the light passes through different sub-grating layers, it will be acted upon by different sub-grating layers in turn, and then the light emitted by the light-emitting component will be gathered or gathered, thereby reducing the problem of divergence of the emitted light, and effectively improving the light output rate and utilization efficiency of the light in the display area, while achieving the purpose of improving the display effect of the panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the structure of a vertically stacked full-color display panel provided in the prior art;

[0030] Figure 2 A schematic diagram of a film structure of a display panel provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the propagation effect of light in a grating pattern provided in an embodiment of the present application;

[0032] Figure 4 A diagram illustrating the principle of light acting in a blazed grating provided in an embodiment of the present application;

[0033] Figure 5-Figure 8 Schematic diagram of the film structure corresponding to the preparation process of the grating pattern provided in the embodiment of the present application. DETAILED DESCRIPTION

[0034] In the following detailed description, only certain embodiments of the present invention are shown and described simply by way of illustration. As those skilled in the art will appreciate, the embodiments described herein may be modified in various ways without departing from the spirit or scope of the present invention.

[0035] In the drawings, the thickness of layers, films, panels, regions, etc. may be exaggerated for clarity, better understanding, and ease of description. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present.

[0036] In addition, unless explicitly described to the contrary, the word "comprise" and its variations such as "comprising" or "containing" will be understood to imply the inclusion of the elements discussed but not necessarily the exclusion of other elements. Further, in the specification, the word "on..." refers to placement above or below an object part, and does not necessarily mean placement on the upper side of the object part based on the direction of gravity.

[0037] It will be understood that although the terms "first", "second", etc. may be used herein to describe various components, these components should not be limited by these terms. These components are only used to distinguish one component from another.

[0038] As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0039] It will also be understood that the terms “comprises” and / or “comprising” used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

[0040] It will be understood that when a layer, region or component is referred to as being “formed on” another layer, region or component, it can be directly or indirectly formed on the other layer, region or component. For example, intervening layers, regions or components may be present.

[0041] In the following examples, the x-axis, y-axis, and z-axis are not limited to the three axes of the rectangular coordinate system and can be interpreted in a broader sense. For example, the x-axis, y-axis, and z-axis can be perpendicular to each other or can represent different directions that are not perpendicular to each other.

[0042] like Figure 1 As shown, Figure 1The schematic diagram of the structure of the vertically stacked full-color display panel provided in the prior art. When preparing the above-mentioned display panel, the display panel may be a silicon-based display panel. The display panel 100 includes a plurality of pixel units 20, and each pixel unit 20 also includes a red light-emitting element 102 arranged on a silicon base 101, a green light-emitting element 103 arranged above the red light-emitting element 102, and a blue light-emitting element 104 arranged above the green light-emitting element 103. By stacking the above-mentioned organic red light-emitting element 102, green light-emitting element 103 and blue light-emitting element 104 in sequence, a vertical stacking structure is formed to improve its display effect. However, due to the small size of the display panel and after the above-mentioned stacking structure is set up, the light emitted by the light-emitting element has a large divergence angle, the emitted light is not concentrated, the display effect is not ideal, and the overall performance of the display panel is reduced.

[0043] In the embodiments of the present application, a display panel and a display device are provided. The display panel is a silicon-based full-color display panel. Optionally, the film structure provided in the embodiments of the present application can also be applied to general display panels, which will not be described in detail here. In the embodiments of the present application, a grating pattern is provided to effectively improve the light emission effect, reduce the divergence problem of light, and improve the overall performance of the device.

[0044] like Figure 2 As shown, Figure 2 This is a schematic diagram of the film structure of a display panel provided in an embodiment of the present application. When configuring this display panel, the selected substrate is a silicon-based circuit substrate 301. By directly fabricating various light-emitting devices on the silicon-based circuit substrate 301, a silicon-based display panel is formed, thereby improving its overall performance.

[0045] Specifically, when preparing the silicon-based circuit substrate 301, multiple control transistors are also formed in the silicon-based circuit substrate 301, which are not specifically drawn in the figure. Multiple control transistors can provide different control signals to ensure the normal operation of the display panel. When preparing the silicon-based circuit substrate, its preparation process and corresponding structure can be prepared according to the general silicon-based circuit substrate or circuit substrate preparation process.

[0046] Furthermore, the display panel further comprises a plurality of light emitting devices arranged in an array on the silicon-based circuit substrate, each light emitting device being provided with a pixel unit 20. In the embodiment of the present application, when the light emitting device and the corresponding pixel unit 20 are provided, see Figure 2 Each light emitting device further includes a plurality of stacked light emitting elements 40 and a bonding layer 50 correspondingly arranged between the light emitting elements 40. In the embodiment of the present application, each light emitting element 40 is arranged on the light emitting path of the light emitting device, and the specific setting can be made according to different products.

[0047] In the following embodiments, when multiple layers of light-emitting elements 40 are provided, the light-emitting elements 40 may be provided as a first light-emitting element, a second light-emitting element, and a third light-emitting element. For ease of explanation, in the embodiments of the present application, the first light-emitting element is a red light-emitting element 102, the second light-emitting element is a green light-emitting element 103, and the third light-emitting element is a blue light-emitting element 104. Optionally, the light-emitting elements may be inorganic light-emitting layers or other light-emitting structural elements. The number of light-emitting elements may be set to suit different products. The positional relationship between light-emitting elements of different colors and the colors of light-emitting elements in different layers may be changed as needed. The control principle and stacking method are all carried out in accordance with the methods in the embodiments of the present application and will not be further elaborated here.

[0048] Specifically, the red light-emitting element 102 can be directly disposed on the first electrode 402 of the silicon-based circuit substrate 301, thereby providing a control signal to it through the first electrode 402. Furthermore, when arranging the different light-emitting elements 40 corresponding to each pixel unit, the area of ​​the light-emitting element closer to the first electrode 402 can be larger than the area of ​​the light-emitting element farther from the first electrode 402. This allows the light-emitting element 40 at the bottom to have a larger light-emitting area, further enhancing the full-color effect of the vertically stacked structure and ensuring the overall performance of the display panel.

[0049] In the embodiment of the present application, when the red light-emitting element 102 is provided, a layer of the red light-emitting element 102 is directly laid on the entire surface of the display panel, so that different pixel units can use the same red light-emitting element. In this way, by providing a whole layer of red light-emitting elements 102 on the silicon-based substrate, the film structure is simplified. Moreover, because different pixel units share the same red light-emitting element, when some pixel units fail to work properly, their corresponding red light-emitting elements can still provide light for pixel units in other areas, thereby effectively improving the brightness of the red pixels in each pixel unit. When the display panel is displaying dynamic images, the purpose of improving the brightness of white light can be achieved. Alternatively, as needed, a red light-emitting element 102 is provided in each pixel unit, and the red light-emitting elements in different pixel units are independent of each other. The above two structures can be set according to different needs.

[0050] Furthermore, the bonding layer 50 may include a first bonding layer 501, a second bonding layer 502, and a third bonding layer 503. Specifically, the first bonding layer 501 is disposed on the red light-emitting element 102, while the green light-emitting element 103 is disposed on the first bonding layer 501, the second bonding layer 502 is disposed on the green light-emitting element 103, and the blue light-emitting element 104 is disposed on the second bonding layer 502, thereby stacking light-emitting elements of different colors on corresponding bonding layers to form a vertically stacked silicon-based display panel in the embodiment of the present application.

[0051] In an embodiment of the present application, when setting the above-mentioned different light-emitting components, the area of ​​the red light-emitting component 102 is larger than the area of ​​the green light-emitting component 103. At the same time, the area of ​​the green light-emitting component 103 is larger than the area of ​​the blue light-emitting component 104, thereby setting light-emitting components of different colors to different area sizes to effectively improve their full-color display effect.

[0052] Furthermore, a second electrode 602 and a third electrode 603 are correspondingly provided on both sides of each light emitting element. The second electrode 602 and the third electrode 603 are correspondingly provided on both sides of the light emitting element, such as at the edge positions of both sides. Figure 2 The electrode connection structure in the embodiment of the present invention is as follows: the second electrode 602 is respectively arranged on the right side of the green light emitting element 103 and the blue light emitting element 104, and the third electrode 603 is respectively arranged on the left side of the green light emitting element 103 and the blue light emitting element or above the corresponding light emitting element, and the light emitting elements of different colors are electrically connected. Figure 1 The electrode connection method and structure in the device are used to realize signal transmission.

[0053] In the embodiment of the present application, for each light-emitting element of a different color, the second electrode 602 and the third electrode 603 serve as the anode and cathode, thereby establishing electrical conduction with the blue light-emitting element 104 and the green light-emitting element 103, respectively, through the second electrode 602 and the third electrode 603, and controlling the normal operation of the corresponding light-emitting element. The arrangement and placement of the different electrodes can be customized based on the specific product and will not be further described here.

[0054] See Figure 2 In the structure, the display panel further includes a grating pattern 30. Specifically, the grating pattern 30 is correspondingly arranged in the bonding layer 50. For example, the grating pattern 30 is at least arranged in the first bonding layer 501 or the second bonding layer 502. In the following embodiments, when describing the grating patterned structure, the above-mentioned grating pattern is provided in two different bonding layers as an example. Optionally, when the grating pattern is provided in only one bonding layer, its effect and structure can refer to the structure in the embodiment of the present application, and will not be repeated here.

[0055] Specifically, in any bonding layer, the grating pattern 30 is correspondingly arranged on the light emitting path of the first light emitting element, and in the corresponding bonding layer, the grating pattern includes two oppositely arranged sub-grating layers.

[0056] In the embodiment of the present application, a first grating group is disposed within the first bonding layer 501, comprising a first sub-grating layer 201 and a second sub-grating layer 302. The first sub-grating layer 201 can be disposed on a side close to the red light-emitting element 102, while the second sub-grating layer 302 is disposed opposite the first sub-grating layer 201. Furthermore, the second sub-grating layer 302 is disposed on a side of the first sub-grating layer 201 away from the red light-emitting element 102. In this manner, light emitted by the red light-emitting element is first acted upon by the first sub-grating layer 201 and then by the second sub-grating layer 302.

[0057] Correspondingly, a second grating group is disposed within the second bonding layer 502, comprising a third sub-grating layer 303 and a fourth sub-grating layer 304. The third sub-grating layer 303 and the fourth sub-grating layer 304 are disposed opposite each other, with the third sub-grating layer 303 disposed on the side closest to the green light-emitting element 103, and the fourth sub-grating layer 304 disposed on the side of the third sub-grating layer 303 further away from the green light-emitting element 103. Thus, when light is emitted from the bottom light-emitting element, it first passes through the third sub-grating layer 303 and then through the fourth sub-grating layer 304.

[0058] In the embodiments of the present application, when arranging the sub-grating layers within the aforementioned different bonding layers, the patterned structures of the respective sub-grating layers are configured accordingly: specifically, the patterned structure of the first sub-grating layer 201 is identical to the patterned structure of the third sub-grating layer, and the patterned structure of the second sub-grating layer 302 is identical to the patterned structure of the fourth sub-grating layer. In the following embodiments, the patterned structures primarily include parameters such as the grating shape, structure, grating width, and grating plane, and these identical patterned structures have the same effect on light.

[0059] Furthermore, to better ensure the effect of the grating pattern on light, improve the light emission effect within the light-emitting area, and reduce the degree of divergence, in the embodiment of the present application, the first sub-grating layer 201 and the third sub-grating layer 303 have the same patterned structure, and the second sub-grating layer 302 and the fourth sub-grating layer 304 have the same patterned structure. In this way, the grating patterns in the two different layers have the same effect, thereby ensuring the concentration of the emitted light.

[0060] During the configuration, the refractive indices of the two sub-grating layers in the same grating group are different, and in two adjacent grating groups, the refractive indices of the two sub-grating layers are opposite in magnitude in the light emitting direction.

[0061] Specifically, the refractive index of the first sub-grating layer 201 is greater than that of the second sub-grating layer 302, while the refractive index of the third sub-grating layer 303 is less than that of the fourth sub-grating layer 304. Alternatively, the refractive index of the first sub-grating layer 201 is less than that of the second sub-grating layer 302, while the refractive index of the third sub-grating layer 303 is greater than that of the fourth sub-grating layer 304. In this way, the refractive indices of the sub-grating layers in two different layers are opposite, allowing the different grating patterns to interact with each other. Furthermore, the different refractive indices of the two sub-grating layers can further enhance the light conversion efficiency of the grating layer, ensuring the light extraction efficiency and overall performance of the panel.

[0062] Optionally, the refractive index corresponding to the aforementioned grating pattern can be set to 1.25-2.89. In the embodiment of the present application, the absolute value of the refractive index difference between the two sub-grating layers in each grating group is set to be greater than 0.4 and less than 0.9. Optionally, the refractive index of the first sub-grating layer 201 is set to 1.74, and the corresponding refractive index of the second sub-grating layer 302 can be set to 1.41 or 2.33. By controlling the refractive index difference between the two different sub-grating layers, the effect on light can be controlled, ensuring that light from multiple angles has a good convergence degree and improving the light output efficiency.

[0063] In the embodiment of the present application, the above-mentioned grating patterns are all set as blazed gratings. By setting each sub-grating layer as a blazed grating, the degree of light convergence of the display panel is effectively improved, and the utilization rate of the emitted light is improved.

[0064] Furthermore, within the same bonding layer, the orthographic projection of the bottom sub-grating layer on the substrate can be completely located within the projection area of ​​the upper sub-grating layer on the substrate. In this way, the light passing through the first sub-grating layer 201 can be completely acted upon again by the second sub-grating layer, thereby ensuring the effect of the grating pattern on the light.

[0065] At the same time, the patterned structures of the two opposite sub-grating layers are staggered to ensure the effect of light in the two different sub-grating layers. Figure 3 As shown, Figure 3 Schematic diagram of the propagation effect of light in the grating pattern provided in the embodiment of the present application. Figure 2 The structure of the display panel in Figure 3 In the partial film layer structure provided, light is emitted from the red light-emitting element 102 corresponding to the first light-emitting element. Since the light emitted by the first light-emitting element will be emitted in different directions, there will be greater loss for the light with a larger divergence angle, which will lead to a reduction in the emitted light. The light emission angle, that is, the light utilization rate, is low, which is not conducive to improving the display effect of the panel.

[0066] In the embodiment of the present application, light G and light H are used as examples for illustration. The divergence angle of light G is greater than the divergence angle of light H. Both light G and light H first pass through the first sub-grating layer 201. After completing the action on the first sub-grating layer 201, they continue to propagate and enter the second sub-grating layer 302, where they are again acted upon by the second sub-grating layer 302.

[0067] See Figure 3 The structure in , and Figure 4 As shown, Figure 4 This is a diagram illustrating the principle of light acting on a blazed grating provided in the embodiments of this application. The grating patterns provided in the embodiments of this application are all blazed gratings. Because the grating width and blaze angle of the blazed grating are relatively small, and when light A acts on the grating inclined surface of the blazed grating, according to the principle of light propagation and the blazed grating, the following relationship can be obtained:

[0068] 2dsinθ0cosα=mλ

[0069]

[0070] In the above relationship, α is the incident angle of the incident light A on the grating inclined surface, φ is the angle between the incident light A and the horizontal direction, d is the width of the blazed grating, θ0 is the angle between the normal on the grating inclined surface and the horizontal direction, and β is the exit angle of the outgoing light B.

[0071] In the embodiment of the present application, the blazed grating includes a blaze angle θ, a grating width d, a wavelength of light λ, and an interference level of the grating pattern m;

[0072] This yields the following relationship: 2dsinθ = mλ.

[0073] According to the above relationship, the incidence and emission conditions of the light can be adjusted. For example, according to the above parameters m, λ, d and the incident angle α, the incident light within the range corresponding to the angle θ0 can be determined. The corresponding light in the direction of the emitted light B is relatively strong, just like the dazzling light reflected from the smooth surface of an object, thereby enhancing the light.

[0074] At the same time, based on the above relationship, the positions of the main maxima of each level of interference can also be obtained. For example, corresponding to the m-order interference, a smaller grating width d can be used for modulation, and then the light-emitting components of different colors can be adjusted separately, so that the light efficiency of the light-emitting components of different colors can be enhanced. In the embodiment of the present application, the conversion efficiency of the blazed grating is greater than or equal to 90%. The main maximum direction of the single-slit diffraction corresponding to the blazed grating is the reflection direction of the incident light. If the optical path difference between two adjacent beams of light in this direction satisfies the m-order of the grating equation, the zero-order of the single-slit diffraction and the m-order of the inter-slit interference can be overlapped, thereby further enhancing its display effect.

[0075] Furthermore, after the light A and light B are acted upon by the first sub-grating layer 201, they will continue to be acted upon by the second sub-grating layer 302. And the angle of the emitted light will be further adjusted. Figure 3 In the embodiment, after the light rays pass through the first sub-grating layer 201, most of the light rays have a consistent exit angle, but the exit angle is still not ideal. When the exit light rays pass through the second sub-grating layer 302, they are once again affected by the blazed grating.

[0076] Because the two opposing sub-grating layers have the same grating structure, the operation on the second sub-grating layer is identical to that on the first sub-grating layer and will not be further elaborated here. The light emission angle is adjusted according to the aforementioned relationship, so that the light ultimately exits the second sub-grating layer 302 at a right angle or a near-right angle. Furthermore, light G at the edge is also emitted perpendicularly toward the light emission direction, thereby reducing light loss, improving light utilization, and enhancing the display quality of the panel.

[0077] Specifically, in the embodiment of the present application, based on the aforementioned blazed grating and its corresponding relationship, for the red light emitted by the first light-emitting element, the aforementioned parameter values ​​can be set as follows: m = 1, λ = 620nm, d = 876nm, α = 0°, and θ0 = 45°. This ensures that the light ultimately emitted from the second sub-grating layer has an ideal exit angle, thereby improving light utilization. Similarly, the third sub-grating layer 303 and the fourth sub-grating layer 304 between the green and blue light-emitting elements can be configured in the same manner as described above, ultimately allowing the exiting light to exit perpendicularly from one side of the light-emitting device. Thus, after specifying the direction, the emission angle is more concentrated, resulting in higher optical and mechanical utilization, and significantly improving the device's display effect.

[0078] In order to ensure the combined effect of the two opposing sub-gratings on light, in the embodiment of the present application, the grooves 44 of the blazed grating corresponding to the first sub-grating layer 201 correspond to the grating planes 46 of the second sub-grating layer 302, and the grating planes 46 of the blazed grating corresponding to the first sub-grating layer 201 correspond to the grooves 44 of the second sub-grating layer 302.

[0079] Furthermore, the grooves of the blazed grating corresponding to the third sub-grating layer correspond to the grating planes of the fourth sub-grating layer. This ensures that more light emitted from the bottom sub-grating layer is affected by the upper sub-grating layer to the greatest extent possible, thereby improving its light output angle and increasing the light output rate in the vertical direction.

[0080] Furthermore, in the embodiment of the present application, the display panel further includes an insulating layer 504 disposed on the third light-emitting element, and a lens layer 901 disposed on the insulating layer 504. The lens layer 901 is provided to further improve the light extraction efficiency.

[0081] like Figure 5-Figure 8 As shown, Figure 5-Figure 8 Schematic diagram of the film structure corresponding to the preparation process of the grating pattern provided in the embodiment of the present application.

[0082] When preparing the blazed grating pattern structure provided in the embodiment of the present application, a substrate 91 is first provided, and a photoresist layer 92 is coated on the substrate 91. In the embodiment of the present application, the material of the substrate 91 can be a transparent SiO2 material.

[0083] The photoresist layer 92 is then etched. The photoresist layer can also be a photosensitive material, typically formed by exposing the photosensitive material to two interfering laser beams. This results in a periodic interference pattern on the upper surface of the substrate 91. This is then further etched through physical or chemical treatment, resulting in a sinusoidal surface pattern 93 on the substrate surface. After this treatment, a plasma etching process is used to form a blaze angle on the surface of the substrate, ultimately resulting in the blazed grating pattern provided in this application.

[0084] Furthermore, embodiments of the present application also provide a light-emitting display device. When fabricating the display device, it includes the display panel of the embodiments of the present application, and the display panel is configured according to the film layer structure of the embodiments of the present application. By providing the aforementioned grating pattern, the light propagation path and light output angle are improved, thereby increasing the light output efficiency and improving the overall performance of the panel.

[0085] In the embodiment of the present application, the display panel and display device can be any product or component with display function or touch function, such as a mobile phone, computer, electronic paper, monitor, etc., and its specific type is not specifically limited.

[0086] In summary, the above is a detailed introduction to a display panel and a display device provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present invention. Although the present invention is disclosed as above in preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is based on the scope defined by the claims.

Claims

1. A display panel, characterized in that: include: A light-emitting device is formed on a circuit substrate, and the light-emitting device includes at least: A first light-emitting element is provided on the circuit substrate; a first bonding layer, disposed on the first light-emitting element; a second light-emitting element, disposed on the first bonding layer and electrically connected to the first light-emitting element; a second bonding layer, disposed on the second light-emitting element; a third light-emitting element, disposed on the second bonding layer; and A grating pattern is at least arranged in the first bonding layer or the second bonding layer and on the light emitting path above the first light emitting element. The grating pattern includes two sub-grating layers arranged opposite to each other.

2. The display panel according to claim 1, wherein: The two sub-grating layers corresponding to the grating pattern have different refractive indices.

3. The display panel according to claim 1, wherein: The grating pattern includes a first grating group disposed in the first bonding layer, and a second grating group disposed in the second bonding layer; The first grating group includes a first sub-grating layer arranged on a side close to the first light-emitting element, and a second sub-grating layer arranged on a side away from the first light-emitting element; The second grating group includes a third sub-grating layer arranged on the second light-emitting element, and a fourth sub-grating layer arranged on a side away from the second light-emitting element.

4. The display panel according to claim 3, wherein: The pattern structure of the first sub-grating layer is the same as that of the third sub-grating layer, and the pattern structure of the second sub-grating layer is the same as that of the fourth sub-grating layer.

5. The display panel according to claim 3, wherein: The first sub-grating layer, the second sub-grating layer, the third sub-grating layer, and the fourth sub-grating layer are all configured as blazed gratings.

6. The display panel according to claim 5, wherein: The patterned structure of the first sub-grating layer and the patterned structure of the second sub-grating layer are arranged in a staggered manner, and the patterned structure of the third sub-grating layer and the patterned structure of the fourth sub-grating layer are arranged in a staggered manner.

7. The display panel according to claim 6, wherein: The grooves of the blazed grating corresponding to the first sub-grating layer correspond to the grating plane of the second sub-grating layer, and the grating plane of the blazed grating corresponding to the first sub-grating layer corresponds to the grooves of the second sub-grating layer; Furthermore, the grooves of the blazed grating corresponding to the third sub-grating layer correspond to the grating planes of the fourth sub-grating layer.

8. The display panel according to claim 3, wherein: The refractive index of the first sub-grating layer is greater than the refractive index of the second sub-grating layer, and the refractive index of the third sub-grating layer is less than the refractive index of the fourth sub-grating layer; Alternatively, the refractive index of the first sub-grating layer is smaller than the refractive index of the second sub-grating layer, and the refractive index of the third sub-grating layer is larger than the refractive index of the fourth sub-grating layer.

9. The display panel according to claim 1, wherein: The grating structure corresponding to the grating pattern includes a blaze angle θ, a grating width d, a wavelength of light λ, and an interference level m of the grating pattern; Here, the following relationship is satisfied: 2dsinθ=mλ.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 9.

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