Display panel and display device

Abstract

The embodiment of the invention provides a display panel and a display device. The display panel comprises a first light-emitting part, a first bonding layer, a second light-emitting part, a second light-emitting part, a second bonding layer, a third light-emitting part and a grating pattern, wherein the grating pattern is at least arranged in the first bonding layer or the second bonding layer. And the grating pattern comprises two sub-grating layers which are oppositely arranged. The grating patterns are arranged in the different bonding layers, when light passes through the different sub-grating layers, the light is sequentially acted by the different sub-grating layers, and then the light emitted by the light-emitting part is gathered or gathered, so that the problem of emergent light divergence is reduced, the light emitting rate and the utilization efficiency of the light in the display area are effectively improved, and the display effect is improved. Meanwhile, the purpose of improving the display effect of the panel is achieved.

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] In order to further improve the luminous performance of the display panel, a silicon-based (Si) circuit substrate material is currently used as a substrate and a Si-uLED light-emitting device is further formed thereon. Compared with traditional light-emitting devices, Si-uLED has the advantages of smaller volume and higher brightness and has attracted attention. However, in the prior art, when preparing the above-mentioned light-emitting device, due to the small volume of Si-uLED, and when the smaller Si-uLED is vertically stacked and a device structure with better full-color display performance is formed, a size effect will occur. That is, as the pixel size decreases, the side area and the opening area of ​​the pixel will increase accordingly, thereby causing the luminous efficiency of the light-emitting device to be significantly reduced. For example, when preparing a full-color panel with vertical stacking, due to the vertical stacking structure design, the thickness of the film layer after stacking is large, and in the case of a large thickness, when the display panel is emitting light, the propagation path and direction of the light are relatively divergent, such as the light scattering is serious in the luminous center area, and the light divergence and scattering angle at the edge position are large, and the loss is serious, 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 seriously divergent, and the light emission angle and light emission effect are not ideal. Summary of the invention

[0005] The embodiments of the present invention provide a display panel and a display device, which can effectively improve the problem that the light of the existing display panel is more divergent and the light utilization rate is lower when the display panel is emitting light.

[0006] In order 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, wherein the light emitting device at least comprises:

[0007] A first light-emitting element is disposed 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 is 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] Wherein, 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 an embodiment of the present invention, a display device is further provided. The display device includes the display panel provided in the embodiment 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 on 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 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 layer 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 showing the working principle of light in a blazed grating provided in an embodiment of the present application;

[0033] Figure 5-Figure 8 Schematic diagram of the film layer 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 and for 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 like "include" or "contain" will be understood to imply the inclusion of the discussed elements, 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 an 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” as used herein specify the presence of stated features or components, but do not exclude 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 may 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 on the red light-emitting element 102, and a blue light-emitting element 104 arranged on the green light-emitting element 103. The above-mentioned organic red light-emitting element 102, green light-emitting element 103 and blue light-emitting element 104 are stacked in sequence to form a vertical stacking structure to improve its display effect. However, due to the small size of the display panel and after the above-mentioned stacking structure is set, the light emitted by the light-emitting element has a large divergence angle, the emitted light is not concentrated, and the display effect is not ideal, thereby reducing the overall performance of the display panel.

[0043] In the embodiment 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 layer structure provided in the embodiment of the present application can also be applied to a general display panel, which will not be described in detail here. In the embodiment of the present application, a grating pattern is set 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 The following is a schematic diagram of a film structure of a display panel provided in an embodiment of the present application. When setting up the display panel, the selected substrate is a silicon-based circuit substrate 301, and each light-emitting device is directly prepared on the silicon-based circuit substrate 301 to form a silicon-based display panel and improve its comprehensive performance.

[0045] Specifically, when preparing the silicon-based circuit substrate 301, a plurality of control transistors are also formed in the silicon-based circuit substrate 301, which are not specifically shown in the figure. The plurality of 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 of which is 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 also 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, which can be specifically set according to different products.

[0047] In the following embodiments, when multiple layers of light-emitting components 40 are provided, the light-emitting components 40 may be provided as a first light-emitting component, a second light-emitting component, and a third light-emitting component. For ease of explanation, in the embodiments of the present application, the first light-emitting component is a red light-emitting component 102, the second light-emitting component is a green light-emitting component 103, and the third light-emitting component is a blue light-emitting component 104. Optionally, the light-emitting components may be inorganic light-emitting layers or other light-emitting structural components. Other quantities may be provided according to different products during setting, and the positional relationship between light-emitting components of different colors and the colors of light-emitting components in different layers may be changed according to requirements. 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 described in detail here.

[0048] Specifically, the red light emitting element 102 can be directly arranged on the first electrode 402 of the silicon-based circuit substrate 301, so that a control signal is provided to it through the first electrode 402. Further, when different light emitting elements 40 corresponding to each pixel unit are arranged, the area of ​​the light emitting element close to the first electrode 402 can be larger than the area of ​​the light emitting element far from the first electrode 402. In this way, the light emitting element 40 at the bottom has a larger light emitting area, thereby further improving the full-color effect of the vertical stacking structure and ensuring the comprehensive 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, a whole layer of red light emitting elements 102 is provided on the silicon-based substrate to simplify the film structure. Moreover, since different pixel units share the same red light emitting element, when some pixel units cannot work normally, the corresponding red light emitting element can still provide light for the pixel units in other areas, thereby effectively improving the brightness of the red pixels in each pixel unit. When the display panel displays dynamic images, the purpose of improving the brightness of white light can be achieved. Alternatively, according to needs, 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 provided according to different needs.

[0050] Further, 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, so that light emitting elements of different colors are stacked on the corresponding bonding layers, and a silicon-based display panel with a vertical stacking structure in the embodiment of the present application is formed.

[0051] In the 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, so that the light-emitting components of different colors are set 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 arranged on both sides of each light emitting element. The second electrode 602 and the third electrode 603 are correspondingly arranged 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, 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 on the top of the corresponding light emitting element, and the light emitting elements of different colors are electrically connected, see 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 different colors, the second electrode 602 and the third electrode 603 are equivalent to the anode and the cathode, so that the second electrode and the third electrode 603 are respectively connected with the blue light-emitting element 104 and the green light-emitting element 103, and control the normal operation of the corresponding light-emitting element. When the above-mentioned different electrodes are set, their settings and arrangement positions can be set according to the specific product, which will not be repeated here.

[0054] See Figure 2 In the structure, the display panel also 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, it is taken as an example that the above-mentioned grating pattern is arranged in two different bonding layers. Optionally, when the grating pattern is only arranged in any 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 arranged in the first bonding layer 501, and the first grating group includes a first sub-grating layer 201 and a second sub-grating layer 302. The first sub-grating layer 201 can be arranged on a side close to the red light emitting element 102, and the second sub-grating layer 302 is arranged opposite to the first sub-grating layer 201, and the second sub-grating layer 302 is arranged on a side of the first sub-grating layer 201 away from the red light emitting element 102, so that when the 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 arranged in the second bonding layer 502, and the second grating group includes 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 arranged opposite to each other, and the third sub-grating layer 303 is arranged on a side close to the green light emitting element 103, and the fourth sub-grating layer 304 is arranged on a side of the third sub-grating layer 303 away from the green light emitting element 103. In this way, when the light emitting element at the bottom emits light, the light will first pass through the third sub-grating layer 303, and then pass through the fourth sub-grating layer 304.

[0058] In the embodiment of the present application, when the sub-grating layers in the above-mentioned different bonding layers are arranged, the patterned structures of the sub-grating layers are arranged correspondingly: specifically, the patterned structure of the first sub-grating layer 201 is the same as the patterned structure of the third sub-grating layer, and the patterned structure of the second sub-grating layer 302 is the same as the patterned structure of the fourth sub-grating layer. In the following embodiments, the patterned structures mainly include the same parameters such as the shape, structure, width and grating plane of the grating, and the above-mentioned same patterned structures have the same effect on light.

[0059] Furthermore, in order to better ensure the effect of the grating pattern on the light, improve the emission effect of the light in the light-emitting area, and reduce the divergence, in the embodiment of the present application, the patterned structure of the first sub-grating layer 201 is the same as that of the third sub-grating layer 303, and the patterned structure of the second sub-grating layer 302 is the same as that of the fourth sub-grating layer 304. 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 setting, the refractive indexes of the two sub-grating layers in the same grating group are different, and in two adjacent grating groups, the magnitude relationship of the refractive indexes of the two sub-grating layers in the light emitting direction is opposite.

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

[0062] Optionally, the refractive index corresponding to the above grating pattern can be set to 1.25-2.89. In the embodiment of the present application, in each grating group, the absolute value of the refractive index difference between the two sub-grating layers 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. Thus, by controlling the refractive index difference between the two different sub-grating layers, the effect on the light can be controlled, and it is ensured that the light of multiple angles can have a better convergence degree, and the light output utilization rate of the output light is improved.

[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, so that the light passing through the first sub-grating layer 201 can be completely acted upon by the second sub-grating layer again, 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 a grating pattern provided in an 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 a large 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 description. The divergence angle of light G is greater than the divergence angle of light H. Both light G and light H will first pass through the first sub-grating layer 201, and after the effect on the first sub-grating layer 201 is completed, they will continue to propagate, and will enter the second sub-grating layer 302, and will be acted on by the second sub-grating layer 302 again.

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

[0068] 2dsinθ0cosα=mλ

[0069]

[0070] Among them, in the above relationship, α is the incident angle of the incident light A on the grating inclined plane, φ is the angle between the incident light A and the horizontal direction, d is the width of the blazed grating, and at the same time, θ0 is the angle between the normal on the grating inclined plane and the horizontal direction, and β is the exit angle of the exit light B.

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

[0072] Thus, the following relationship is obtained: 2dsinθ=mλ.

[0073] According to the above relationship, the incident and emitted 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 emitted light in the direction of 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, according to the above relationship, the position of the main maximum of each level of interference can also be obtained. For example, corresponding to the m-level interference, a smaller grating width d can be used for modulation, and then the light-emitting parts of different colors can be adjusted separately, so that the light efficiency of the light-emitting parts of different colors can be gained. In the embodiment of the present application, the conversion efficiency of the blazed grating is greater than or equal to 90%. And 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 the two adjacent light beams in this direction satisfies the m-level of the grating equation, the overlap of the 0-level single-slit diffraction and the m-level of the inter-slit interference can be achieved, thereby further enhancing its display effect.

[0075] Furthermore, after the light A and the 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 is 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 affected by the blazed grating again.

[0076] Since the grating structures of the two opposite sub-grating layers are the same, the effect on the second sub-grating layer is the same as that on the first sub-grating layer, and no further description is given here. The light emission angle is adjusted according to the above relationship, so that the light finally emitted from the second sub-grating layer 302 is emitted at a right angle or a nearly right angle, and the light G at the edge position is also emitted vertically toward the light emission direction, thereby reducing the loss of light, improving the utilization rate of light and the display effect of the panel.

[0077] Specifically, in the embodiment of the present application, according to the above-mentioned blazed grating and its corresponding relationship, for the red light emitted by the first light-emitting element, the above-mentioned parameter values ​​can be set as: m=1, λ=620nm, d=876nm, α=0°, θ0=45°. This ensures that the light finally emitted from the second sub-grating layer can have an ideal exit angle, thereby improving the utilization rate of the light. Similarly, the third sub-grating layer 303 and the fourth sub-grating layer 304 between the green light-emitting element and the blue light-emitting element can be set according to the above method, and finally the exit light can be vertically emitted from one side of the light-emitting device. In this way, after the direction is specified, the light-emitting angle is also more concentrated, so that the optical machine utilization rate is higher, thereby significantly improving the display effect of the device.

[0078] In order to ensure the joint effect of the two opposite sub-gratings on the 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] The grooves of the blazed grating corresponding to the third sub-grating layer correspond to the grating surface of the fourth sub-grating layer. In this way, it can be ensured that more light emitted from the bottom sub-grating layer is affected by the upper sub-grating layer to the greatest extent, thereby improving its light emission angle and increasing the light emission rate in the vertical direction.

[0080] Furthermore, in the embodiment of the present application, the display panel also 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 disposed to further improve the light extraction efficiency.

[0081] like Figure 5-Figure 8 As shown, Figure 5-Figure 8 Schematic diagram of the film layer 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] Then the photoresist layer 92 is etched. The photoresist layer can also be a photosensitive material, which is usually made by exposing the photosensitive material to two interfering laser beams. After completion, a periodic interference pattern is formed on the upper surface of the substrate 91. Then, the etching is continued through physical or chemical treatment, so that the surface of the substrate shows a sinusoidal surface pattern 93. After the treatment is completed, a blaze angle is formed on the surface of the above-mentioned substrate through a plasma etching process, and finally the blazed grating pattern provided in the present application is obtained.

[0084] Furthermore, an embodiment of the present application also provides a light-emitting display device. When the display device is prepared, it includes the display panel in the embodiment of the present application, and the display panel is arranged according to the film layer structure in the embodiment of the present application, and the above-mentioned grating pattern is arranged to improve the propagation path and light output angle of the light, thereby improving the light output rate and improving the comprehensive performance of the panel.

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

[0086] In summary, a display panel and a display device provided by an embodiment of the present invention are introduced in detail above. 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 solution and core idea of ​​the present invention. Although the present invention is disclosed as above in the preferred embodiments, the above preferred embodiments are not used 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 at least comprises: A first light-emitting element is disposed 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 is disposed on the second light emitting element; a third light emitting element, disposed on the second bonding layer; and 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 sub-grating layers arranged opposite to each other.

2. The display panel according to claim 1, characterized in that: The refractive indexes of the two sub-grating layers corresponding to the grating pattern are different.

3. The display panel according to claim 1, characterized in that: 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; Wherein, 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 correspond to each other, 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, characterized in that: 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, characterized in that: 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, characterized in that: 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; Among them, the following relationship is satisfied: 2dsinθ=mλ.

10. A display device, characterized in that: The invention comprises a display panel as claimed in any one of claims 1 to 9.

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