Display panel, manufacturing method, and display device

Abstract

The present application provides a display panel, a manufacturing method, and a display device. The display panel includes: a cover plate assembly, including a cover plate having at least one group of first grooves and a color resist layer, the portion of the color resist layer filling the first groove is formed into a second groove; in a first direction parallel to the cover plate, the size of the bottom of the first groove is smaller than the size of the opening of the first groove; an optical adhesive layer, the portion filling the second groove forms a convex structure, the refractive index of the optical adhesive layer is smaller than the refractive index of the color resist layer; a light-emitting device layer, including a pixel defining layer, the pixel defining layer includes a plurality of pixel openings arranged in an array and a spacing structure provided between any two adjacent pixel openings, and the pixel openings are provided with light-emitting units; each color resist in the color resist layer corresponds to each light-emitting unit one by one, and the orthographic projection of each group of first grooves is located within the area of ​​the spacing structure. The present application can reduce the reflection of ambient light, improve light output efficiency while ensuring an anti-glare effect, and reduce light decay.

Description

Technical Field

[0001] The present application relates to the field of display technology, and more specifically, to a display panel and a manufacturing method, and a display device. Background Art

[0002] Traditional display panels typically use a polarizer (POL) with a quarter-wave plate to reduce ambient light reflection, thereby achieving an anti-glare effect. However, the presence of the polarizer in this technical solution reduces light transmittance. The currently widely adopted COE (Color Filter On Encapsulation) technical solution uses a BM (Black Matrix) and a CF (Color Filter) instead of a polarizer for anti-glare.

[0003] However, in the related art, the light extraction efficiency of the display panel is low and the L-decay (Luminous decay) is serious. Summary of the Invention

[0004] In view of the shortcomings of the existing methods, the present application proposes a display panel and its manufacturing method, and a display device to solve the technical problems of low light output efficiency and severe light decay of display panels in related technologies.

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

[0006] A cover plate assembly includes a cover plate having at least one set of first grooves and a color resist layer disposed on one side of the cover plate, wherein portions of the color resist layer filling the first grooves conformally form second grooves; in a first direction parallel to the cover plate, dimensions of the bottoms of the first grooves are smaller than dimensions of the openings of the first grooves;

[0007] an optical adhesive layer, disposed on a side of the color resist layer away from the cover plate, and filling a portion of the second groove to form a convex structure, wherein the refractive index of the optical adhesive layer is smaller than that of the color resist layer;

[0008] a light-emitting device layer, disposed on a side of the optical adhesive layer away from the cover assembly, comprising a pixel defining layer, wherein the pixel defining layer comprises a plurality of pixel openings arranged in an array and a spacing structure disposed between any two adjacent pixel openings, wherein the pixel openings are provided with light-emitting units;

[0009] Each color resist in the color resist layer corresponds to each light emitting unit one by one, and the orthographic projection of each group of the first grooves is located within the region of the spacing structure.

[0010] Optionally, in a cross section perpendicular to the cover plate, the protruding structure is trapezoidal, and the slope angle of the trapezoid is 45-75 degrees.

[0011] Optionally, in a cross section perpendicular to the cover plate, the inner surface of the first groove is arc-shaped, and the depth of the first groove is 3 to 5 um.

[0012] Optionally, each group of the first grooves includes at most four first grooves.

[0013] Optionally, each group of the first grooves includes two first grooves.

[0014] Optionally, any two adjacent color resists each cover a group of first grooves with the same size along the first direction.

[0015] In a second aspect, an embodiment of the present application provides a display device comprising the display panel described in the first aspect.

[0016] In a third aspect, an embodiment of the present application provides a method for manufacturing a display panel, comprising:

[0017] A set of first grooves are formed on the cover plate in a spacer area corresponding to each spacer structure of the pixel defining layer, such that the bottom of the first groove is smaller than the opening of the first groove in a first direction parallel to the cover plate; a color resist layer is formed on a side of the cover plate having the first grooves, such that the portion of the color resist layer that fills the first grooves conforms to the shape of the second grooves, thereby obtaining a cover plate assembly;

[0018] Manufacturing a pixel defining layer on a substrate, wherein the pixel defining layer includes a plurality of pixel openings arranged in an array and the spacing structure provided between any two adjacent pixel openings; manufacturing a light-emitting unit at each pixel opening to obtain a light-emitting device layer;

[0019] An optical adhesive layer is used to adhere one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer. The refractive index of the optical adhesive layer is smaller than that of the color resist layer.

[0020] Optionally, laminating one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer using an optical adhesive layer includes:

[0021] An optical adhesive layer is manufactured on one side of the color resist layer of the cover assembly, so that a portion of the optical adhesive layer filled in the second groove forms a convex structure;

[0022] Align each color resist in the color resist layer of the cover assembly with each light-emitting unit of the light-emitting device layer one by one, and align each group of the first grooves with each of the spacing structures; and fit the side of the aligned cover assembly having the optical adhesive layer with the side of the pixel defining layer of the light-emitting device layer.

[0023] Optionally, laminating one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer using an optical adhesive layer includes:

[0024] Manufacturing an initial optical adhesive layer on one side of the pixel dielectric layer of the light emitting device layer;

[0025] Align each color resist in the color resist layer of the cover assembly with each light-emitting unit of the light-emitting device layer having the initial optical adhesive layer, and align each group of the first grooves with each of the spacing structures; press one side of the aligned light-emitting device layer having the initial optical adhesive layer with one side of the second groove of the cover assembly to obtain the optical adhesive layer, and the portion of the optical adhesive layer filled in the second groove forms a protruding structure.

[0026] The beneficial technical effects of the technical solutions provided by the embodiments of the present application include at least the following: in a first direction parallel to the cover plate, the bottom of the first groove of the cover plate assembly is smaller than the opening of the first groove; the portion of the color resist layer filling the first groove conforms to form a second groove; and the portion of the optical adhesive layer filling the second groove forms a raised structure; such that, in a cross section perpendicular to the cover plate, the vertical distance between the first end of the side surface s of the raised structure near the opening of the first groove and the mid-perpendicular line of the light-emitting unit is smaller than the vertical distance between the second end of the side surface s of the raised structure near the bottom of the first groove and the mid-perpendicular line. Because the refractive index n1 of the optical adhesive layer is smaller than the refractive index n2 of the color resist layer, a first light ray emitted by the light-emitting unit is incident on the side surface of the raised structure from the color resist layer. The incident angle of the first light ray is greater than the critical angle for total internal reflection between the optical adhesive layer and the color resist layer, and the first light ray is totally reflected and emitted from the display panel. This allows light originally blocked by the black matrix in the related art to be emitted from the display panel, thereby increasing the intensity of the emitted light, facilitating improved luminous brightness, thereby improving light extraction efficiency, reducing light decay, saving electricity, and reducing production costs.

[0027] Furthermore, when the second light from the external environment is incident on the side of the raised structure from the color resist layer, it is totally reflected and passes through the color resist layer. Except for the part with the same color as the color resist layer, the other parts of the second light are absorbed by the color resist layer, so that the intensity of the second light reflected by the internal film layer of the display panel is reduced, thereby reducing the reflection of ambient light and achieving an anti-glare effect. The incident angle of the third light from the external environment is less than the critical angle for total reflection between the optical adhesive layer and the color resist. After passing through a color resist in the second groove, it is refracted at the side of the raised structure (i.e., the interface between the color resist and the optical adhesive layer), then reflected by the internal film layer, and then absorbed by the other adjacent color resist layers. The fourth light from the external environment is refracted after passing through the color resist layer, then reflected by the internal film layer and absorbed by the color resist layer in the second groove, thereby reducing the reflection of ambient light and achieving an anti-glare effect. The application of the embodiments of the present application can reduce the reflection of ambient light, thereby improving the light output efficiency and reducing light decay while ensuring the anti-glare effect.

[0028] Additional aspects and advantages of the present application will be given in part in the following description, which will become apparent from the following description, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0030] Figure 1 This is the luminous principle diagram of the cosine luminous body;

[0031] Figure 2a A schematic diagram of the structure of a display panel and emitted light provided by an embodiment of the present application;

[0032] Figure 2b A schematic diagram of the structure of a display panel and its reflection of ambient light provided in an embodiment of the present application;

[0033] Figure 3 For the embodiment of this application Figure 2a A partial enlarged schematic diagram of the middle area E;

[0034] Figure 4a A schematic diagram of the structure of another display panel and emitted light provided by an embodiment of the present application;

[0035] Figure 4b A schematic diagram of the structure of another display panel and its reflection of ambient light provided in an embodiment of the present application;

[0036] Figure 5a A schematic diagram of the structure of another display panel and emitted light provided in an embodiment of the present application;

[0037] Figure 5b A schematic diagram of the structure of another display panel and its reflection of ambient light provided in an embodiment of the present application;

[0038] Figure 6a A schematic diagram of the structure of another display panel and emitted light provided in an embodiment of the present application;

[0039] Figure 6b A schematic diagram of the structure of another display panel and its reflection of ambient light provided in an embodiment of the present application;

[0040] Figure 7 A schematic flow chart of a method for manufacturing a display panel provided in an embodiment of the present application;

[0041] Figure 8 A schematic diagram illustrating the principle of coating a photoresist layer on a cover plate and performing exposure in the method for manufacturing a display panel provided in an embodiment of the present application;

[0042] Figure 9 A schematic diagram of a film layer structure of a cover plate 11 including a first groove provided in an embodiment of the present application;

[0043] Figure 10 A schematic diagram of the membrane structure of a cover plate assembly provided in an embodiment of the present application;

[0044] Figure 11 A schematic diagram of the film structure of a light-emitting device layer provided in an embodiment of the present application.

[0045] Description of reference numerals:

[0046] 1-cover plate assembly; 11-cover plate, 111-first groove; 12-color resist layer, 121-second groove, 122-color resist, 122a-first color resist, 122b-second color resist, 122c-third color resist;

[0047] 2-optical adhesive layer; 21-convex structure;

[0048] 3-light-emitting device layer; 31-pixel defining layer, 311-pixel opening, 312-spacer structure; 32-light-emitting unit, 32a-light-emitting unit of the first color, 32b-light-emitting unit of the second color, 32c-light-emitting unit of the third color;

[0049] 4-encapsulation layer;

[0050] 5-base;

[0051] A-first direction; D1-dimension of the bottom of the first groove 111 along the first direction A, D2-dimension of the opening of the first groove 111 along the first direction A, D3-dimension of the first groove 111 perpendicular to the first direction A; S-side of the protruding structure;

[0052] a-first light, b-second light, c-third light, d-fourth light, e-fifth light, f-sixth light;

[0053] α is the incident angle of the first light, β is the slope angle of the protruding structure 21 in the cross section perpendicular to the cover plate 11; E is Figure 2a A local area of ​​the display panel includes the first groove 111;

[0054] d1-the vertical distance from the first end of the side surface S of the raised structure 21 close to the opening of the first groove 111 to the midline of the corresponding light-emitting unit 32; d2-the vertical distance from the second end of the side surface S of the raised structure 21 close to the bottom of the first groove 111 to the midline of the corresponding light-emitting unit 32. DETAILED DESCRIPTION

[0055] The following describes the embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the embodiments described below in conjunction with the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0056] Those skilled in the art will understand that, unless otherwise stated, the singular forms "a," "an," "said," and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of this application refers to the presence of features, integers, steps, operations, elements, and / or components, but does not exclude the implementation of other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by the technical field. The term "and / or" used herein refers to at least one of the items defined by the term, for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0057] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0058] First, several terms involved in this application are introduced and explained:

[0059] L-decay (Luminous decay): The attenuation of the luminous intensity of light emitted by a display panel. L-decay in this application includes the attenuation of the luminous intensity of oblique-angle light emitted by a display panel in related technologies.

[0060] Light extraction efficiency (LEE) is the ability of a light-emitting device to convert absorbed energy into light energy upon excitation. It is a key parameter characterizing its functionality. There are three ways to express LEE: power efficiency, lumen efficiency, and light efficiency. In this application, LEE is expressed in lumen efficiency, which provides a more convenient and intuitive way to quantitatively analyze the LEE of an OLED. It is defined as: n = DL / I, where D is the active area of ​​the device; L is the luminance of the device; and I is the operating current when the luminance of the device is L.

[0061] Cosine luminous body: such as Figure 1 As shown in the figure, if the luminous intensity of an extended light source is dB∝cosθ, then the luminous intensity is proportional to cosθ. This type of emitter is called a cosine luminous source, or a Lambert luminous source. The law of luminous flux emitted according to the cosθ law is called Lambert's cosine law. Where dB is the luminous intensity of each element dS of the extended light surface along a certain direction r, and θ is the angle between r and the normal n.

[0062] In the related technical solution, since the light emitted by the light-emitting unit is blocked by the BM, the light intensity of the light emitted by the display panel is reduced, and the light brightness is low when the working current remains unchanged, which leads to low light extraction efficiency and large light decay.

[0063] The present application provides a display panel and its manufacturing method, and a display device by opening a groove on the cover assembly of the display panel to replace the BM in the related art, aiming to solve the above technical problems of the related art.

[0064] The following is a detailed description of the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. It should be noted that the following embodiments can refer to, draw on, or combine with each other, and the same terms, similar features, and similar implementation steps in different embodiments will not be repeated.

[0065] In some embodiments of the present application, Figure 2a 、 Figure 2b and Figure 3 As shown, an embodiment of the present application provides a display panel, including: a cover assembly 1, an optical adhesive layer 2 and a light-emitting device layer 3.

[0066] The cover plate assembly 1 includes a cover plate 11 having at least one set of first grooves 111 and a color resist layer 12 disposed on one side of the cover plate 11. The portion of the color resist layer 12 filling the first grooves 111 conforms to form second grooves 121. In a first direction parallel to the cover plate 11 (direction A in the figure), the dimension D1 of the bottom of the first groove 111 is smaller than the dimension D2 of the opening of the first groove.

[0067] The optical adhesive layer 2 is disposed on the side of the color resist layer 12 away from the cover plate 11 and fills the second groove 121 to form a protrusion structure 21 . The refractive index n1 of the optical adhesive layer 2 is smaller than the refractive index n2 of the color resist layer 12 .

[0068] The light-emitting device layer 3 is arranged on the side of the optical adhesive layer 2 away from the cover assembly 1, and includes a pixel defining layer 31. The pixel defining layer 31 includes a plurality of pixel openings 311 arranged in an array and a spacing structure 312 arranged between any two adjacent pixel openings 311. The pixel openings 311 are provided with light-emitting units 32.

[0069] Each color resist in the color resist layer 12 corresponds to each light emitting unit 32 , and the orthographic projection of each group of first grooves 111 is located within the region of the spacing structure 312 .

[0070] In this embodiment, in a first direction parallel to the cover plate 11, the dimension D1 of the bottom of the first groove of the cover plate assembly 1 is smaller than the dimension D2 of the opening of the first groove. The portion of the color resist layer 12 filling the first groove 111 conforms to form a second groove 121, and the portion of the optical adhesive layer 2 filling the second groove 121 forms a raised structure 21. Thus, in a cross section perpendicular to the cover plate 11, the vertical distance d1 from the first end of the side surface s of the raised structure 21 near the opening of the first groove to the mid-perpendicular line of the light-emitting unit is smaller than the vertical distance d2 from the second end of the side surface s of the raised structure 21 near the bottom of the first groove to the mid-perpendicular line. Because the refractive index n1 of the optical adhesive layer 2 is smaller than the refractive index n2 of the color resist layer 12, the first light ray a emitted by the light-emitting unit 32 is incident on the side surface s of the raised structure from the color resist layer 12. The incident angle α of the first light ray a is greater than the critical angle γ for total internal reflection between the optical adhesive layer 2 and the color resist layer 12, and the first light ray a undergoes total internal reflection and exits the display panel. This allows the light that was originally blocked by the BM in the related technology to be emitted from the display panel, thereby increasing the light intensity of the emitted light, which is beneficial to improving the luminous brightness, thereby improving the light output efficiency, reducing light decay (L-decay), saving electricity, and reducing production costs.

[0071] Furthermore, a second light ray b from the external environment is incident on the side s of the raised structure from the color resist layer 12, undergoes total internal reflection, and then passes through the color resist layer 12. Except for the portion of the second light ray b that shares the same color as the color resist layer 12, the remaining portion of the second light ray b is absorbed by the color resist layer 12, reducing the intensity of the second light ray b reflected from the internal film layers of the display panel. This reduces the reflection of ambient light and achieves an anti-glare effect. A third light ray c from the external environment, with an incident angle θ less than the critical angle γ for total internal reflection between the optical adhesive layer 2 and the color resist layer 12, passes through a color resist within the second groove 121, is refracted at the side s of the raised structure (i.e., the interface between the color resist and the optical adhesive layer 2), is then reflected by the internal film layers, and is subsequently absorbed by the adjacent color resist. A fourth light ray d from the external environment is refracted through the color resist layer 12, then reflected by the internal film layers and absorbed by the color resist layer within the second groove 121, thereby reducing the reflection of ambient light and achieving an anti-glare effect. The application of the embodiments of the present application can reduce the reflection of ambient light, thereby improving the light output efficiency and reducing light decay (L-decay) while ensuring the anti-glare effect.

[0072] In order to more clearly show the optical path of each light and avoid confusion between the second light b and the third light c and the fourth light d, Figure 2b The second ray b in is drawn as a dotted line.

[0073] Optionally, in this embodiment, considering the selection of mass-produced materials, the refractive index of the color resist layer 12 is 1.6-1.7, and the refractive index of the optical adhesive layer 2 is 1.45-1.47.

[0074] Optionally, the refractive index of the color resist layer includes a lower limit of 1.6 and an upper limit of 1.7, and the refractive index of the optical adhesive layer 2 includes a lower limit of 1.45 and an upper limit of 1.47.

[0075] Optionally, in this embodiment, the refractive index n2 of the color-resist layer 12 is 1.7, and the refractive index n1 of the optical adhesive layer 2 is 1.45. According to the formula γ = arcsin(n1 / n2), the critical angle γ for total internal reflection of light between the color-resist layer 12 and the optical adhesive layer 2 is 58.5 degrees. When the incident angle α of the first light ray a is greater than 58.5 degrees and the incident angle of the second light ray b is greater than 58.5 degrees, total internal reflection can occur between the optical adhesive layer 2 and the color-resist layer 12. When the incident angle of the third light ray c is less than 58.5 degrees, it is absorbed by the color-resist layer 12 after refraction and reflection. This allows the display panel to improve light extraction efficiency and reduce light decay while ensuring an anti-glare effect.

[0076] Optionally, in this embodiment, taking into account the needs of actual production, such as Figure 3As shown, the dimension D3 of the first groove 111 perpendicular to the first direction A includes the depth of the first groove 111 . The depth of the first groove 111 may be 2 to 5 μm (micrometers), including a lower limit of 2 μm and an upper limit of 5 μm.

[0077] Optionally, in some embodiments of the present application, Figure 2a 、 Figure 2b and Figure 3 As shown, in a cross section perpendicular to the cover plate 11 , the protruding structure 21 is trapezoidal, and the slope angle β of the trapezoid is 45 to 75 degrees.

[0078] Optionally, the slope angle β of the trapezoid includes a lower limit of 45 degrees and an upper limit of 75 degrees.

[0079] In this embodiment, the raised structure 21 is trapezoidal, with a slope angle β of 45 to 75 degrees. This ensures that the first light a emitted by the light-emitting unit 32 is fully reflected between the color resist layer 12 and the optical adhesive layer 2. This allows the light originally blocked by the BM in the related art to be deflected to a near-normal viewing angle, thereby increasing the intensity of the emitted light at the normal viewing angle. Furthermore, the brightness of the display panel at the normal viewing angle can be increased while the operating current remains unchanged, thereby improving light extraction efficiency and saving energy while enhancing the user's viewing experience. Furthermore, according to Lambert's cosine law, as the light intensity at the normal viewing angle increases, the light intensity at the oblique viewing angle will also increase accordingly when the oblique viewing angle θ remains unchanged, thereby reducing the light attenuation of the display panel at the oblique viewing angle.

[0080] Optionally, in this embodiment, if Figure 2a As shown, the slope angle β of the trapezoid is 60 degrees, and the incident angle α of the first light ray a is 70 degrees. The refractive index n2 of the color resist layer 12 is 1.7, and the refractive index n1 of the optical adhesive layer 2 is 1.45. According to the formula γ = arcsin(n1 / n2), the critical angle γ for total internal reflection of light between the color resist layer 12 and the optical adhesive layer 2 is 58.5 degrees. The incident angle α of the first light ray a is 70 degrees, which is greater than 58.5 degrees, allowing total internal reflection. The first light ray a is emitted at a normal viewing angle, which results in a higher light extraction efficiency for the display panel.

[0081] Optionally, in this embodiment, when the slope angle β of the trapezoid is 45 degrees or 75 degrees, the first light ray a is emitted in a direction close to the normal viewing angle. Specifically, when the slope angle β of the trapezoid is 45 degrees, the emission direction of the first light ray a is deflected 15 degrees counterclockwise along the normal viewing angle. When the slope angle β of the trapezoid is 75 degrees, the emission direction of the first light ray a is deflected 15 degrees clockwise along the normal viewing angle.

[0082] Optionally, in some embodiments of the present application, Figure 4a and Figure 4bAs shown, in a cross section perpendicular to the cover plate 11 , the inner surface of the first groove 111 is arc-shaped, and the depth of the first groove 111 is 3 to 5 μm.

[0083] In this embodiment, the inner surface of the first groove 111 is arc-shaped, which can facilitate the adhesion of the color resist layer 12 and form the second groove 121 therewith, thereby facilitating the manufacture of the display panel; the depth D3 of the first groove 111 is set to 3 to 5 μm, so that the arc shape of the surface of the protruding structure 21 can reach a corresponding curvature, thereby achieving both improved light extraction efficiency and simplified manufacturing process.

[0084] Optionally, the depth of the first groove 111 includes a lower limit of 3 um and an upper limit of 5 um.

[0085] In order to avoid confusion with the second light b, and to more clearly show the light paths of each light, Figure 4b The d rays in are drawn as dashed lines.

[0086] Optionally, in this embodiment, the inner surface of the first groove 111 may be a circular arc or an elliptical arc.

[0087] Optionally, in each embodiment of the present application, the light emitting unit 32 includes a light emitting unit 32a of a first color, a light emitting unit 32b of a second color, and a light emitting unit 32c of a third color; the color resist 122 includes a color resist 122a of a first color, a color resist 122b of a second color, and a color resist 122c of a third color. Figure 4a and Figure 4b In order to more clearly express other elements in the drawings, in some drawings (such as Figure 2a 、 2b and Figure 3 ), the identification of light-emitting units and color resists of different colors are omitted.

[0088] Optionally, in some embodiments of the present application, each group of first grooves 111 includes at most four first grooves 111 .

[0089] In this embodiment, considering the complexity of the actual manufacturing process and ensuring that the light-emitting unit has sufficient light-emitting area, each group of first grooves 111 includes at most four first grooves 111 .

[0090] Optionally, in some embodiments of the present application, reference Figure 5a 、 5b , 6a and 6b, each group of first grooves 111 includes two first grooves 111.

[0091] In this embodiment, each group of first grooves 111 includes two first grooves 111 , which can enhance the anti-glare effect on the one hand and simplify the manufacturing process of the display panel on the other hand.

[0092] Optionally, in this embodiment, refer to Figure 2a 、 2b , Figure 3 and Figure 5a 、 5b The slope angle β of the trapezoid is 60 degrees. The simulation results of the light extraction efficiency improvement rate of the embodiment in which each group of first grooves 111 includes one first groove 111, the embodiment in which each group includes two first grooves 111, and the conventional COE product compared with the POL product, and their respective light decay (L-decay) are shown in Table 1 below.

[0093]

[0094] Table 1

[0095] Based on the first row of Table 1 above, the improvement rate of the light extraction efficiency of the embodiment in which each group of first grooves 111 in the present application includes one first groove 111 relative to the POL product, and the improvement rate of the light extraction efficiency of the embodiment in which each group of first grooves 111 includes two first grooves 111 relative to the POL product are greater than the improvement rate of the light extraction efficiency of the conventional COE product relative to the POL product. It can be concluded that the light extraction efficiency of the embodiment of the present application is greater than the light extraction efficiency of the COE product, and the embodiment of the present application is conducive to improving the light extraction efficiency.

[0096] Based on the second row of Table 1 above, the light decay (L-decay) of the embodiment of the present application at a 45-degree oblique viewing angle is less than that of a conventional COE product at a 45-degree oblique viewing angle. This shows that the embodiment of the present application can reduce light decay compared to conventional COE products. Moreover, the reflectivity of the embodiment of the present application to ambient light is at the same level as that of conventional COE products, ensuring an anti-glare effect. In other words, the display panel of the embodiment of the present application can reduce light decay while maintaining a substantially consistent reflectivity to ambient light.

[0097] Alternatively, as Figure 6a As shown, the inner surface of the first groove 111 is arc-shaped, and the fifth light e emitted by the second color light emitting unit 32b can be refracted by the second color color resist 122b and emitted from the display panel, which is beneficial to increase the light intensity of the emitted light, improve the light brightness, and reduce light decay; Figure 6b As shown, the sixth light f can be fully reflected between the optical adhesive layer 2 and the second color resist 122b, and thus absorbed by the third color resist 122c corresponding to the same group of first grooves 111, thereby helping to reduce the reflection of ambient light and enhance the anti-glare effect.

[0098] To avoid Figure 6a is confused with the first ray a, Figure 6b The fourth light d and the sixth light f are confused in the figure to show the light paths of each light more clearly. Figure 6a The fifth ray e and Figure 6b The second ray b in is drawn as a dotted line.

[0099] Optionally, in some embodiments of the present application, reference Figure 6a and Figure 6b , any two adjacent color resists each cover a group of first grooves 111 with the same size along the first direction.

[0100] In this embodiment, any two adjacent color blocks each cover a group of first grooves 111 of equal size along the first direction, so that the area of ​​each color block can be evenly distributed, which is conducive to the uniform distribution of light emitted by the light-emitting unit 32 and can enhance the user's visual experience.

[0101] Based on the same inventive concept, optionally, an embodiment of the present application further provides a display device, comprising the display panel provided by the above embodiment.

[0102] In this embodiment, since the display device includes the display panel provided by the above embodiment, its beneficial effects also include the beneficial effects of the above embodiment, which will not be described in detail here.

[0103] Based on the same inventive concept, the present invention provides a method for manufacturing a display panel. The flow chart of the method is as follows: Figure 7 As shown, the following steps S10-S30 are included:

[0104] S10: A set of first grooves are formed in the spacer area corresponding to each spacer structure of the pixel defining layer on the cover plate, so that the size of the bottom of the first groove is smaller than the size of the opening of the first groove in a first direction parallel to the cover plate; a color resist layer is manufactured on the side of the cover plate having the first groove, so that the portion of the color resist layer filling the first groove is conformally formed into a second groove, thereby obtaining a cover plate assembly; and then step S30 is performed.

[0105] Optionally, based on a patterning process, a set of first grooves 111 are formed in the spacer region corresponding to each spacer structure of the pixel defining layer on the cover plate 11, such that the bottom of the first groove is smaller than the opening of the first groove in a first direction parallel to the cover plate 11, thereby obtaining a cover plate 11 including first grooves. Based on the patterning process, a color resist layer 12 is fabricated on the side of the cover plate 11 having the first grooves 111. The portion of the color resist layer 12 that fills the first grooves 111 is conformally formed into second grooves 121, thereby obtaining a cover plate assembly 1.

[0106] For example, Figure 8As shown, a layer of photoresist (PR resin) is coated on one side of the cover plate 11; a mask is used to expose the photoresist at the spacing area of ​​the cover plate 11 corresponding to each spacing structure of the pixel defining layer; the photoresist in the exposed area is removed by a development process to obtain a patterned photoresist mask layer, wherein each spacing area on the cover plate 11 is exposed in the patterned photoresist mask layer.

[0107] The cover plate 11 having the patterned photoresist mask layer is etched with HF (hydrofluoric acid) so that a group of first grooves 111 are etched in each spacer area of ​​the cover plate 11, so that the size of the bottom of the first groove is smaller than the size of the opening of the first groove in a first direction parallel to the cover plate, and the obtained Figure 9 The cover plate 11 shown has various groups of first grooves 111 .

[0108] A first color initial color resist layer is applied to the side of the cover plate 11 having the first groove 111, and the first color initial color resist layer is patterned to obtain a first color color resist 122a corresponding to the first color light emitting unit; the portion of the first color color resist 122a filling the first groove 111 is formed into a second groove 121. Similarly, a second color color resist 122b corresponding to the second color light emitting unit and a third color color resist 122c corresponding to the third color light emitting unit are sequentially manufactured to obtain a color resist layer 12, thereby obtaining the following: Figure 10 The film layer structure of the cover plate assembly 1 is shown.

[0109] S20; manufacturing a pixel defining layer on the substrate, the pixel defining layer including a plurality of pixel openings arranged in an array and a spacing structure provided between any two adjacent pixel openings; manufacturing a light-emitting unit at each pixel opening to obtain a light-emitting device layer.

[0110] The above steps S10 and S20 can be performed simultaneously or in sequence. The cover assembly can be manufactured first according to step S10, or the light emitting device layer can be manufactured first according to step S20.

[0111] Optionally, a pixel defining layer 3 is manufactured on the substrate 5 based on a patterning process, and the pixel defining layer 31 includes a plurality of pixel openings 311 arranged in an array and a spacing structure 312 arranged between any two adjacent pixel openings 311; a light-emitting unit 32 is manufactured at each pixel opening 311 using an evaporation process to obtain a light-emitting device layer 3.

[0112] For example, an initial pixel definition layer is manufactured on a substrate 5. The initial pixel definition layer is patterned to obtain Figure 11The pixel defining layer 31 shown in FIG. 3 includes a plurality of pixel openings 311 arranged in an array and a spacing structure 312 disposed between any two adjacent pixel openings 311. A light emitting unit 32 is manufactured at each pixel opening 311 by using an evaporation process to obtain a pixel defining layer 311. Figure 11 The light emitting device layer 3 is shown.

[0113] S30: Using an optical adhesive layer to adhere one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer, wherein the refractive index of the optical adhesive layer is smaller than the refractive index of the color resist layer.

[0114] A method for manufacturing a display panel provided in an embodiment of the present application can enable the cover assembly 1 and the light-emitting device layer 3 to be manufactured in a non-fixed order, thereby avoiding the situation where a certain process flow of the production line fails and affects the entire production line during the manufacturing process in a fixed order, and can improve the safety of the production line; the cover assembly 1 and the light-emitting device layer 3 in the embodiment of the present application can also be manufactured at the same time, which can save manufacturing time and improve production efficiency.

[0115] Optionally, laminating one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer using an optical adhesive layer includes:

[0116] An optical adhesive layer is manufactured on one side of the color resist layer of the cover assembly, so that a portion of the optical adhesive layer filling the second groove forms a convex structure.

[0117] Align each color resist in the color resist layer of the cover assembly with each light-emitting unit of the light-emitting device layer one by one, and align each group of first grooves with each spacing structure; adhere the side of the aligned cover assembly having the optical adhesive layer to the side of the pixel defining layer of the light-emitting device layer to obtain a display panel.

[0118] Optionally, laminating one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer using an optical adhesive layer includes:

[0119] An initial optical adhesive layer is manufactured on one side of the pixel defining layer of the light emitting device layer.

[0120] Align each color resist in the color resist layer of the cover assembly with each light-emitting unit of the light-emitting device layer having an initial optical adhesive layer, and align each group of first grooves with each spacing structure; press one side of the aligned light-emitting device layer having the initial optical adhesive layer with one side of the second groove of the cover assembly to obtain an optical adhesive layer, and the portion of the optical adhesive layer filled in the second groove forms a convex structure to obtain a display panel.

[0121] For example, the film structure of the display panel can be as follows Figure 6b shown.

[0122] In this embodiment, since the optical adhesive layer is formed by laminating the initial optical adhesive, the bonding performance of the optical adhesive is brought into play, so that the gap between the color resist layer and the optical adhesive layer is small, which is beneficial to enhancing the display effect of the display panel.

[0123] By using the optical adhesive layer and adopting the above two methods to bond the cover plate assembly to the light emitting device layer, the display panel can be manufactured under different process conditions, which is beneficial to the mass production of the display panel.

[0124] By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

[0125] 1. In this embodiment of the present application, in a first direction parallel to the cover plate 11, the dimension D1 of the bottom of the first groove of the cover plate assembly 1 is smaller than the dimension D2 of the opening of the first groove. The portion of the color resist layer 12 filling the first groove 111 conforms to form a second groove 121, and the portion of the optical adhesive layer 2 filling the second groove 121 forms a raised structure 21. Such that, in a cross section perpendicular to the cover plate 11, the vertical distance d1 from the first end of the side surface s of the raised structure 21 near the opening of the first groove to the mid-perpendicular line of the light-emitting unit is smaller than the vertical distance d2 from the second end of the side surface s of the raised structure 21 near the bottom of the first groove to the mid-perpendicular line. Because the refractive index n1 of the optical adhesive layer 2 is smaller than the refractive index n2 of the color resist layer 12, the first light ray a emitted by the light-emitting unit 32 is incident on the side surface s of the raised structure from the color resist layer 12. The incident angle α of the first light ray a is greater than the critical angle γ for total internal reflection between the optical adhesive layer 2 and the color resist layer 12, and the first light ray a is totally reflected and emitted from the display panel. This allows the light that was originally blocked by the BM in the related technology to be emitted from the display panel, thereby increasing the light intensity of the emitted light, which is beneficial to improving the luminous brightness, thereby improving the light extraction efficiency, reducing light decay, saving electricity, and reducing production costs.

[0126] Furthermore, a second light ray b from the external environment is incident on the side s of the raised structure from the color resist layer 12, undergoes total internal reflection, and then passes through the color resist layer 12. Except for the portion of the second light ray b that shares the same color as the color resist layer 12, the remaining portion of the second light ray b is absorbed by the color resist layer 12, reducing the intensity of the second light ray b reflected from the internal film layers of the display panel. This reduces the reflection of ambient light and achieves an anti-glare effect. A third light ray c from the external environment, with an incident angle θ less than the critical angle γ for total internal reflection between the optical adhesive layer 2 and the color resist layer 12, passes through a color resist within the second groove 121, is refracted at the side s of the raised structure (i.e., the interface between the color resist and the optical adhesive layer 2), is then reflected by the internal film layers, and is subsequently absorbed by the adjacent color resist. A fourth light ray d from the external environment is refracted through the color resist layer 12, then reflected by the internal film layers and absorbed by the color resist layer within the second groove 121, thereby reducing the reflection of ambient light and achieving an anti-glare effect. The application of the embodiments of the present application can reduce the reflection of ambient light, thereby improving the light output efficiency and reducing light decay while ensuring the anti-glare effect.

[0127] 2. The raised structure 21 of the embodiment of the present application is trapezoidal, and the slope angle β of the trapezoid is 45 to 75 degrees, which can increase the light intensity of the emitted light along the normal viewing angle and reduce the light attenuation of the display panel at the oblique viewing angle, thereby enhancing the user's viewing experience.

[0128] 3. In the embodiment of the present application, the inner surface of the first groove 111 is curved, which facilitates the adhesion of the color resist layer 12 and the subsequent formation of the second groove 121, facilitating display panel manufacturing. The depth D3 of the first groove 111 is set to 3 to 5 μm, which allows the curved surface of the protruding structure 21 to achieve a corresponding curvature, thereby achieving both improved light extraction efficiency and a simplified manufacturing process.

[0129] 4. In the embodiment of the present application, each group of first grooves 111 includes two first grooves 111 , which can enhance the anti-glare effect on the one hand and simplify the manufacturing process of the display panel on the other hand.

[0130] 5. In the embodiment of the present application, any two adjacent color blocks each cover a group of first grooves 111 with equal dimensions along the first direction, which can make the area distribution of each color block uniform, facilitate the uniform distribution of light emitted by the light-emitting unit 32, and enhance the user's visual experience.

[0131] 6. The manufacturing method of the display panel provided in the embodiment of the present application can enable the cover assembly 1 and the light-emitting device layer 3 to be manufactured in a non-fixed order, thereby avoiding the situation where a certain process flow of the production line fails and affects the entire production line during the manufacturing process in a fixed order, and can improve the safety of the production line; the cover assembly 1 and the light-emitting device layer 3 in the embodiment of the present application can also be manufactured at the same time, which can save manufacturing time and improve production efficiency.

[0132] 7. The manufacturing method of the display panel provided in the embodiment of the present application is beneficial to exerting the bonding performance of the optical adhesive since the optical adhesive layer is pressed together by the initial optical adhesive, so that the gap between the color resist layer and the optical adhesive layer is smaller, which is beneficial to enhancing the display effect of the display panel.

[0133] 8. In the embodiments of the present application, two methods are used to bond the cover assembly to the light-emitting device layer, so that the display panel can be manufactured under different process conditions, which is conducive to the mass production of the display panel.

[0134] Those skilled in the art will appreciate that the steps, measures, and schemes in the various operations, methods, and processes discussed in this application may be interchanged, modified, combined, or deleted. Furthermore, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application may also be interchanged, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and schemes in the related art that are similar to those disclosed in this application may also be interchanged, modified, rearranged, decomposed, combined, or deleted.

[0135] In the description of this application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are exemplary directions or positional relationships based on the accompanying drawings. They are intended to facilitate or simplify the description of the embodiments of this application, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0136] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0137] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0138] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0139] It should be understood that, although the various steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, the order of implementation of these steps is not limited to the order indicated by the arrows. Unless otherwise clearly stated herein, in some implementation scenarios of the embodiments of the present application, the steps in each process can be performed in other orders as required. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, or may be executed at different times in different scenarios at the execution time. The execution order of these sub-steps or stages may be flexibly configured as required, and the embodiments of the present application do not limit this.

[0140] The above are only some of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the solution of the present application, other similar implementation methods based on the technical ideas of the present application also fall within the protection scope of the embodiments of the present application.

Claims

1. A display panel, characterized in that: include: A cover plate assembly includes a cover plate having at least one set of first grooves and a color resist layer disposed on one side of the cover plate, wherein portions of the color resist layer filling the first grooves conformally form second grooves; in a first direction parallel to the cover plate, dimensions of the bottoms of the first grooves are smaller than dimensions of the openings of the first grooves; an optical adhesive layer, disposed on a side of the color resist layer away from the cover plate, and filling a portion of the second groove to form a convex structure, wherein the refractive index of the optical adhesive layer is smaller than that of the color resist layer; a light-emitting device layer, disposed on a side of the optical adhesive layer away from the cover assembly, comprising a pixel defining layer, wherein the pixel defining layer comprises a plurality of pixel openings arranged in an array and a spacing structure disposed between any two adjacent pixel openings, wherein the pixel openings are provided with light-emitting units; Each color resist in the color resist layer corresponds to each light emitting unit one by one, and the orthographic projection of each group of the first grooves is located within the region of the spacing structure.

2. The display panel according to claim 1, wherein: In a cross section perpendicular to the cover plate, the protruding structure is trapezoidal, and the slope angle of the trapezoid is 45-75 degrees.

3. The display panel according to claim 1, wherein: In a cross section perpendicular to the cover plate, the inner surface of the first groove is arc-shaped, and the depth of the first groove is 3 to 5 μm.

4. The display panel according to claim 1, wherein: Each group of the first grooves includes at most four first grooves.

5. The display panel according to claim 4, wherein: Each group of the first grooves includes two first grooves.

6. The display panel according to claim 1, wherein: Any two adjacent color resists each cover a group of the first grooves with the same size along the first direction.

7. A display device, characterized in that: The display panel comprises any one of claims 1 to 6.

8. A method for manufacturing a display panel, characterized in that: include: A set of first grooves are formed on the cover plate in a spacer area corresponding to each spacer structure of the pixel defining layer, such that the bottom of the first groove is smaller than the opening of the first groove in a first direction parallel to the cover plate; a color resist layer is formed on a side of the cover plate having the first grooves, such that the portion of the color resist layer that fills the first grooves conforms to the shape of the second grooves, thereby obtaining a cover plate assembly; Manufacturing a pixel defining layer on a substrate, wherein the pixel defining layer includes a plurality of pixel openings arranged in an array and the spacing structure provided between any two adjacent pixel openings; manufacturing a light-emitting unit at each pixel opening to obtain a light-emitting device layer; An optical adhesive layer is used to adhere one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer. The refractive index of the optical adhesive layer is smaller than that of the color resist layer.

9. The method for manufacturing a display panel according to claim 8, wherein: Adhere one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer using an optical adhesive layer, comprising: An optical adhesive layer is manufactured on one side of the color resist layer of the cover assembly, so that a portion of the optical adhesive layer filled in the second groove forms a convex structure; Align each color resist in the color resist layer of the cover assembly with each light-emitting unit of the light-emitting device layer one by one, and align each group of the first grooves with each of the spacing structures; and fit the side of the aligned cover assembly having the optical adhesive layer with the side of the pixel defining layer of the light-emitting device layer.

10. The method for manufacturing a display panel according to claim 8, wherein: Adhere one side of the second groove of the cover assembly to one side of the pixel defining layer of the light-emitting device layer using an optical adhesive layer, comprising: Manufacturing an initial optical adhesive layer on one side of the pixel defining layer of the light emitting device layer; Align each color resist in the color resist layer of the cover assembly with each light-emitting unit of the light-emitting device layer having the initial optical adhesive layer, and align each group of the first grooves with each of the spacing structures; press one side of the aligned light-emitting device layer having the initial optical adhesive layer with one side of the second groove of the cover assembly to obtain the optical adhesive layer, and the portion of the optical adhesive layer filled in the second groove forms a protruding structure.

Images