Display panel and display device

Abstract

The present application provides a display panel and a display device for improving light extraction efficiency. The display panel includes a substrate, a light-emitting layer, an encapsulation layer, a plurality of lens elements and a light-transmitting layer. The light-emitting layer is arranged on one side of the substrate, and includes a plurality of light-emitting units arranged at intervals, and a pixel-defining layer is arranged between adjacent light-emitting units. The encapsulation layer is arranged on the side of the light-emitting layer away from the substrate. A plurality of lens elements are arranged on the side of the encapsulation layer away from the light-emitting layer, and the projection of the lens elements on the substrate at least partially overlaps with the projection of the pixel-defining layer on the substrate. The light-transmitting layer is arranged on the side of the encapsulation layer away from the light-emitting layer, and at least part of the light-transmitting layer is located between adjacent lens elements, and the projection of the light-transmitting layer on the substrate at least partially overlaps with the projection of the light-emitting unit on the substrate. The lens element has a side surface in contact with the light-transmitting layer, and the refractive index of the lens element at the side surface is less than the refractive index of the light-transmitting layer.

Description

Technical Field

[0001] The present application relates to the field of electronic display technology, and in particular to a display panel and a display device. Background Art

[0002] OLED display devices have many advantages such as self-luminescence, low driving voltage, high luminous efficiency, short response time, high clarity and contrast, nearly 180° viewing angle, wide operating temperature range, flexible display and large-area full-color display. Therefore, they are widely used in the display field, lighting field, smart wearable field and other fields.

[0003] However, in traditional OLED displays, light ultimately must pass through the high-refractive-index cover plate (CG) into the low-refractive-index air. When the incident angle of light at the cover plate interface reaches or exceeds the critical angle for total internal reflection, total internal reflection (TIR) ​​occurs, resulting in low light extraction efficiency for the display device. Summary of the Invention

[0004] According to a first aspect of an embodiment of the present application, there is provided a display panel, including:

[0005] substrate;

[0006] a light-emitting layer disposed on one side of the substrate, comprising a plurality of light-emitting units disposed at intervals, with a pixel defining layer disposed between adjacent light-emitting units;

[0007] an encapsulation layer, disposed on a side of the light-emitting layer away from the substrate;

[0008] a plurality of lens elements disposed on a side of the encapsulation layer away from the light-emitting layer, wherein a projection of the lens element on the substrate at least partially overlaps with a projection of the pixel defining layer on the substrate, the lens element comprising a first lens and a second lens stacked together, the first lens being disposed adjacent to the encapsulation layer, and the second lens being located on a side of the first lens away from the encapsulation layer;

[0009] a light-transmitting layer, disposed on a side of the encapsulation layer away from the light-emitting layer, wherein at least a portion of the light-transmitting layer is located between adjacent lens elements, and a projection of the light-transmitting layer on the substrate at least partially overlaps with a projection of the light-emitting unit on the substrate;

[0010] The lens element has a side surface in contact with the light-transmitting layer, and the refractive index of the lens element at the side surface is lower than the refractive index of the light-transmitting layer.

[0011] In one embodiment, a first reflective layer is disposed on a surface of the lens element adjacent to the packaging layer, and a second reflective layer is disposed on a surface of the lens element away from the packaging layer. The first reflective layer and the second reflective layer are disposed face to face.

[0012] In one embodiment, a protrusion is provided between the lens element and the packaging layer, the protrusion having a bottom surface adjacent to the packaging layer and a top surface adjacent to the lens element, the top surface convex toward the lens element, and the first reflective layer is provided on the top surface.

[0013] In one embodiment, the material of the protrusions includes a photosensitive material.

[0014] In one embodiment, the first reflective layer is in a broken line shape or an arc shape, and the distance between the first reflective layer and the encapsulation layer gradually decreases from the center to the edge.

[0015] In one embodiment, the material of the first reflective layer and / or the second reflective layer includes silver.

[0016] In one embodiment, the display panel further comprises a black matrix block, the black matrix block is located on a side of the lens element away from the encapsulation layer, and a projection of the black matrix block on the substrate at least partially overlaps with a projection of the lens element on the substrate;

[0017] The black matrix block has a lower surface adjacent to the lens element and an upper surface away from the lens element, and the second reflective layer is in contact with the lower surface.

[0018] In one embodiment, the second reflective layer is in a broken line shape or an arc shape, and the distance between the second reflective layer and the encapsulation layer gradually increases from the center to the edge.

[0019] In one embodiment, a slope angle formed between the side surface and the encapsulation layer is greater than or equal to 45 degrees and less than 90 degrees.

[0020] In one embodiment, the refractive index of the light-transmitting layer is 1.65 to 1.7, and the refractive index of the lens element is 1.45 to 1.5.

[0021] In one embodiment, the light-transmitting layer is a planarization layer filled between adjacent lens elements;

[0022] The display panel further includes a filter layer formed on a side of the light-transmitting layer and the lens element away from the encapsulation layer.

[0023] In one embodiment, the light-transmitting layer is served by a portion of a filter layer, a portion of the filter layer is filled between adjacent lens elements as the light-transmitting layer, and another portion of the filter layer is formed on a side of the light-transmitting layer and the lens elements away from the packaging layer.

[0024] In one embodiment, the filter layer includes a red filter layer, a green filter layer and a blue filter layer;

[0025] The side surface of the lens element contacts the filter layer as a light-transmitting layer, and the slope angle between the side surface and the encapsulation layer is greater than or equal to 45 degrees and less than 90 degrees;

[0026] The slope angles formed by different side surfaces contacting different color filter layers are different.

[0027] In one embodiment, the slope angle of the side surface in contact with the red filter layer is greater than or equal to 65 degrees and less than or equal to 70 degrees;

[0028] The slope angle of the side surface in contact with the green filter layer is greater than or equal to 55 degrees and less than or equal to 60 degrees;

[0029] The slope angle of the side surface contacting the blue filter layer is greater than or equal to 45 degrees and less than or equal to 50 degrees.

[0030] In one embodiment, a surface of the second lens away from the first lens is a light emitting surface allowing light to pass through.

[0031] In one embodiment, the light emitting surface of the second lens is in a broken line shape or an arc shape; and the distance between the light emitting surface and the encapsulation layer gradually increases or decreases from the center of the light emitting surface to the edge of the light emitting surface.

[0032] In one embodiment, the first lens and the second lens are made of the same material, and a contact surface between the first lens and the second lens is a plane.

[0033] In one embodiment, the width of the lens element gradually decreases in a direction away from the encapsulation layer.

[0034] In one embodiment, the lens element further includes the third lens, which is disposed on a side of the second lens or the first lens away from the encapsulation layer, and a refractive index of the third lens is greater than a refractive index of the first lens and / or the second lens.

[0035] According to a second aspect of an embodiment of the present application, a display device is provided, comprising the display panel as described above.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0038] Figure 1 is a schematic diagram of the cross-sectional structure of a display panel according to an embodiment of the present application;

[0039] Figure 2(a) to Figure 2(g) yes Figure 1 A schematic diagram of the manufacturing process of the display panel is shown;

[0040] Figures 3 to 5 yes Figure 1 Schematic diagrams of cross-sectional structures of several modified examples of display panels;

[0041] Figure 6 is a schematic cross-sectional structural diagram of a display panel according to another embodiment of the present application;

[0042] Figures 7 to 11 yes Figure 6 The embodiments show schematic cross-sectional structures of several modified examples of display panels. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0044] The present application embodiment provides a display panel 100, please refer to Figure 1 ,include:

[0045] substrate 10;

[0046] The light-emitting layer 20 is provided on one side of the substrate 10 and includes a plurality of light-emitting units 22 (only one light-emitting unit 22 is shown in the figure) arranged at intervals, and a pixel defining layer 28 is provided between adjacent light-emitting units 22;

[0047] The encapsulation layer 30 is disposed on a side of the light-emitting layer 20 away from the substrate 10;

[0048] a plurality of lens elements 40 disposed on a side of the encapsulation layer 30 away from the light-emitting layer 20 , wherein a projection of the lens elements 40 on the substrate 10 at least partially overlaps with a projection of the pixel-defining layer 28 on the substrate 10 (i.e., the lens elements 40 are located above the pixel-defining layer 28 );

[0049] a light-transmitting layer 60 disposed on a side of the encapsulation layer 30 away from the light-emitting layer 20 , with at least a portion of the light-transmitting layer 60 located between adjacent lens elements 40 , and a projection of the light-transmitting layer 60 on the substrate 10 at least partially overlapping with a projection of the light-emitting unit 22 on the substrate 10 (i.e., the light-transmitting layer 60 is located above the light-emitting unit 22 ), so that light emitted by the light-emitting unit 22 can pass through and enter the user's eyes;

[0050] The lens element 40 has a side surface 41 in contact with the light-transmitting layer 60 . The refractive index of the lens element 40 at the side surface 41 is lower than the refractive index of the light-transmitting layer 60 .

[0051] In the above embodiment, by providing the lens element 40, the light emitting effect of the display panel is effectively improved. Specifically, a portion of the light emitted by the light-emitting unit 22 will directly pass through the light-transmitting layer 60 into the user's eyes, and the other portion will be irradiated onto the side surface 41 of the lens element 40. At the above-mentioned side surface 41, when the incident angle of the light (for example, the light L1) is greater than the critical angle of total reflection, total reflection will occur, and the light L2 formed by the reflection will directly enter the user's eyes through the light-transmitting layer 60; when the incident angle of the light (for example, the light L3) is less than the critical angle of total reflection, refraction will occur, and the refracted light L4, L5, L6, and L7 will also enter the user's eyes through the lens element 40. As a result, the light emitting efficiency of the display panel is significantly improved.

[0052] In some embodiments, as Figure 1 A first reflective layer 42 is provided on the surface of the lens element 40 adjacent to the packaging layer 30 , and a second reflective layer 44 is provided on the surface of the lens element 40 away from the packaging layer 30 . The first reflective layer 42 and the second reflective layer 44 are provided face to face.

[0053] The first reflective layer 42 and the second reflective layer 44 can reflect the light refracted from the side surface 41 into the lens element 40 once or multiple times and then emit it to the user's eyes. Figure 1 The light L3 is first refracted into the lens element 40 to form the light L4, which is reflected by the second reflective layer 44 to form the light L5, and then reflected by the first reflective layer 42 to form the light L6; the light L6 is refracted at the side surface 41 to form the light L7 and is emitted upward to enter the user's eyes.

[0054] Continue to refer to Figure 1 In some embodiments, a protrusion 50 is provided between the lens element 40 and the packaging layer 30, and the protrusion 50 has a bottom surface adjacent to the packaging layer 30 and a top surface adjacent to the lens element 40, the top surface convex toward the lens element 40, and the first reflective layer 42 is provided on the top surface.

[0055] In some embodiments, the material of the protrusion 50 includes or is a photosensitive material. The photosensitive material can be a positive acrylic material. Acrylic is also called PMMA or organic glass, and its chemical name is polymethyl methacrylate.

[0056] In some embodiments, the first reflective layer 42 is in the shape of a broken line, which is formed by connecting two or more straight lines, such as Figure 1 、 Figure 3 In some embodiments, the first reflective layer 42 is arc-shaped, such as Figure 4 、 Figure 5 The arc can be a standard circular arc or an irregular curve. Regardless of whether it is a broken line or an arc, the first reflective layer 42 is preferably convex. That is, the distance between the first reflective layer 42 and the encapsulation layer 30 gradually decreases from the center of the first reflective layer 42 to the edge of the first reflective layer 42.

[0057] In some embodiments, the material of the first reflective layer 42 and / or the second reflective layer 44 includes / is silver (Ag).

[0058] In some embodiments, the light emitting units 22 are divided into a red light emitting unit for emitting red light, a green light emitting unit for emitting green light, and a blue light emitting unit for emitting blue light. Each light emitting unit 22 includes a light emitting material layer 23 and two electrodes located on both sides of the light emitting material layer 23. Figure 1 Only the anode 25 located below the light emitting material layer 23 is shown.

[0059] Continue to refer to Figure 1 In some embodiments, the display panel 100 further includes a plurality of spaced black matrix blocks 70, which form a black matrix (BM). The black matrix blocks 70 are located on a side of the lens element 40 away from the encapsulation layer 30, and the projection of the black matrix blocks 70 on the substrate 10 at least partially overlaps with the projection of the lens element 40 on the substrate 10, that is, the black matrix blocks 70 are located above the lens element 40.

[0060] The black matrix block 70 has a lower surface adjacent to the lens element 40 and an upper surface away from the lens element 40, and the second reflective layer 44 is in contact with the lower surface of the black matrix block 70 (or the second reflective layer 44 is arranged in contact with the lower surface of the black matrix block 70).

[0061] In some embodiments, the second reflective layer 44 is in the shape of a broken line, which is formed by connecting two or more straight lines, such as Figure 1 、 Figure 3In some embodiments, the second reflective layer 44 is arc-shaped, such as Figure 4 、 Figure 5 The arc can be a standard circular arc or an irregular curve. Regardless of whether it is a broken line or an arc, the second reflective layer 44 is preferably convex. That is, the distance between the second reflective layer 44 and the encapsulation layer 30 gradually increases from the center of the second reflective layer 44 to the edge of the second reflective layer 44.

[0062] In some embodiments, the width of the lens element 40 gradually decreases in the direction away from the encapsulation layer 30. That is, the lens element 40 is narrow at the top and wide at the bottom. In some embodiments, the slope angle formed by the side surface 41 and the encapsulation layer 30 is greater than or equal to 45 degrees and less than 90 degrees. Preferably, the slope angle is greater than or equal to 45 degrees and less than or equal to 70 degrees. More preferably, the slope angle is about 55 degrees. After multiple experiments, it has been verified that the shape of the lens element 40 being narrow at the top and wide at the bottom and the setting of the above-mentioned slope angle are conducive to further improving the light extraction efficiency of the display panel.

[0063] In some embodiments, the lens element 40 includes a first lens 45 and a second lens 47 stacked together, with the first lens 45 positioned adjacent to the encapsulation layer 30 and the second lens 47 positioned on a side of the first lens 45 away from the encapsulation layer 30. The lens element 40 is divided into two parts, the first lens 45 and the second lens 47, to facilitate the placement of the first reflective layer 42 and the second reflective layer 44.

[0064] In some embodiments, the first lens 45 and the second lens 47 are made of the same material, and the contact surface between the first lens 45 and the second lens 47 is a plane. In some embodiments, the lens element 40 may include only one lens, and the morphology of the lens is the same as the overall morphology of the first lens 45 and the second lens 47.

[0065] In some embodiments, the light-transmitting layer 60 and the lens element 40 are made of optical adhesives of different materials. The light-transmitting layer 60 has a refractive index of 1.65 to 1.7, and the lens element 40 has a refractive index of 1.45 to 1.5.

[0066] In some embodiments, as Figure 1 and Figure 4As shown, the light-transmitting layer 60 is a planarizing layer that completely fills the space between adjacent lens elements 40. The light-transmitting layer 60 does not extend above the lens elements 40. The display panel 100 also includes a filter layer 80 and an optical adhesive layer 90. The filter layer 80 is formed on the side of the light-transmitting layer 60 and the lens elements 40 away from the encapsulation layer 30. The optical adhesive layer 90 is formed on the side of the filter layer 80 away from the lens elements 40. The optical adhesive layer 90 is a transparent material that allows light to pass through. Furthermore, the optical adhesive layer 90 has a certain thickness and is a flowable material during the formation process, which helps to flatten the upper surface.

[0067] Please refer to Figure 3 or Figure 5 As shown, in some embodiments, the light-transmitting layer 60 is formed by a portion of a filter layer 80. A portion of the filter layer 80 is filled between adjacent lens elements 40 to serve as the light-transmitting layer 60, while another portion of the filter layer 80 is formed on the side of the light-transmitting layer 60 and lens elements 40 away from the encapsulation layer 30. The filter layer 80 includes a red filter layer 84, a green filter layer 86, and a blue filter layer 82. The red filter layer 84 is located above the red light-emitting unit and is used to filter out light other than red light; the green filter layer 86 is located above the green light-emitting unit and is used to filter out light other than green light; and the blue filter layer 82 is located above the blue light-emitting unit and is used to filter out light other than blue light. The side surface 41 of the lens element 40 contacts the filter layer 80 serving as the light-transmitting layer 60. The slope angle formed between the side surface 41 and the encapsulation layer 30 is greater than or equal to 45 degrees and less than 90 degrees. Furthermore, the slope angles formed by the different side surfaces 41 contacting different color filter layers 80 are different, so as to obtain a better white balance effect.

[0068] The refractive indices of red filter layer 84, green filter layer 86, and blue filter layer 82 are all different. For example, the refractive index of red filter layer 84 for 620nm red light is 1.71; the refractive index of green filter layer 86 for 550nm green light is 1.63; and the refractive index of blue filter layer 82 for 460nm blue light is 1.58. If all lens elements 40 are manufactured in the same configuration (made of the same material, with a refractive index of 1.47 and having the same slope angle), then the critical angles for total internal reflection at the interface between light-transmitting layer 60 and lens element 40, which are formed by different color filter layers, will be different: 59.8° (i.e., arcsin 1.47 / 1.71), 64.4° (i.e., arcsin 1.47 / 1.63), and 68.5° (i.e., arcsin 1.47 / 1.57), respectively. This will lead to inconsistent light extraction efficiency gains at light-emitting units of different colors (the smaller the total reflection critical angle, the higher the light extraction efficiency), which will ultimately affect the white balance of the displayed image.

[0069] Generally speaking, the above-mentioned white balance can be well achieved by setting the slope angle of the lens element 40 corresponding to the red filter layer 84 (i.e., the slope angle of the side surface 41 in contact with the red filter layer 84) to 65 degrees to 70 degrees (inclusive), setting the slope angle of the lens element 40 corresponding to the green filter layer 86 (i.e., the slope angle of the side surface 41 in contact with the green filter layer 86) to 55 degrees to 60 degrees (inclusive), and setting the slope angle of the lens element 40 corresponding to the blue filter layer 82 (i.e., the slope angle of the side surface 41 in contact with the blue filter layer 82) to 45 degrees to 50 degrees.

[0070] The embodiment of the present application also provides a method for manufacturing a display panel, which can be used to manufacture the above-mentioned display panel. As shown in Figure 2(a), a substrate 10 is first provided, on which a light-emitting layer 20 and an encapsulation layer 30 have been formed. The light-emitting layer 20 includes a plurality of light-emitting units 22 (only one light-emitting unit 22 is shown in the figure) arranged at intervals, and a pixel defining layer 28 is provided between adjacent light-emitting units 22. The light-emitting units 22 can be divided into a red light-emitting unit for emitting red light, a green light-emitting unit for emitting green light, and a blue light-emitting unit for emitting blue light. Each light-emitting unit 22 includes a light-emitting material layer 23 and two electrodes located on both sides of the light-emitting material layer 23. Only the anode 25 located below the light-emitting material layer 23 is shown in the figure. The encapsulation layer 30 is arranged on the side of the light-emitting layer 20 away from the substrate 10. The encapsulation layer 30 can be a stacked structure of an inorganic insulating layer-an organic insulating layer-an inorganic insulating layer.

[0071] As shown in Figure 2(b), a plurality of protrusions 50 are formed above the encapsulation layer 30, and the protrusions 50 are located directly above the pixel defining layer 28. However, the boundaries of the protrusions 50 do not have to completely coincide with the boundaries of the pixel defining layer 28. For example, the range covered by the protrusions 50 may be slightly smaller than the range covered by the pixel defining layer 28. The top surface of the protrusions 50 may protrude outward. The material of the protrusions 50 may be a photosensitive material, such as a positive acrylic material. Then, a first reflective layer 42 may be formed on the top surface of the protrusions 50. The material of the first reflective layer 42 may include silver or silver.

[0072] As shown in FIG2(c), a first lens 45 is formed on the protrusion 50 and the first reflective layer 42. The first lens 45 and the protrusion 50 may form an isosceles trapezoidal shape that is wider at the bottom and narrower at the top. The first lens 45 may have a slope angle between 45 degrees and 90 degrees, and a thickness between 1 micron and 3 microns.

[0073] As shown in Figures 2(d) and 2(e), a second lens 47 is formed above the first lens 45, and a groove is provided on the upper surface of the second lens 47. The material of the second lens 47 can be the same as that of the first lens 45. Furthermore, the slope angle of the second lens 47 can be between 45 degrees and 90 degrees, preferably the same as the slope angle of the first lens 45, so that the lens element 40 as a whole has an isosceles trapezoidal shape. The thickness of the second lens 47 can be between 1 micron and 3 microns. The cross-section of the groove located on the upper surface of the second lens 47 is preferably an inverted isosceles triangle. The slope of the groove can be between 10 degrees and 35 degrees, preferably 20 degrees.

[0074] Then, a second reflective layer 44 may be formed on the surface of the groove. The planar shape of the second reflective layer 44 is the same or substantially the same as that of the surface of the groove. The second reflective layer 44 may also be made of silver.

[0075] As shown in FIG2( f ), a light-transmitting layer 60 is filled between adjacent lens elements 40 . The light-transmitting layer 60 can be made of optical adhesive, and its refractive index can be between 1.65 and 1.7. Furthermore, the refractive index of the side surface 41 of the lens element 40 is lower than that of the light-transmitting layer 60 .

[0076] 2( g ), a black matrix block 70 is formed above the lens element 40 and the second reflective layer 44 , and a projection of the black matrix block 70 on the substrate 10 at least partially overlaps with a projection of the lens element 40 on the substrate 10 .

[0077] Finally, a filter layer 80 and an optical adhesive layer 90 are sequentially formed on the black matrix block 70 and the light-transmitting layer 60 to obtain Figure 1 The display panel 100 shown in FIG. The manufacturing method of the display panel in other embodiments is similar to this solution and will not be described in detail here.

[0078] The present application also provides a display panel 200. Figure 6 ,include:

[0079] substrate 10;

[0080] The light-emitting layer 20 is provided on one side of the substrate 10 and includes a plurality of light-emitting units 22 (only one light-emitting unit 22 is shown in the figure) arranged at intervals, and a pixel defining layer 28 is provided between adjacent light-emitting units 22;

[0081] The encapsulation layer 30 is disposed on a side of the light-emitting layer 20 away from the substrate 10;

[0082] a plurality of lens elements 40 disposed on a side of the encapsulation layer 30 away from the light-emitting layer 20 , wherein a projection of the lens elements 40 on the substrate 10 at least partially overlaps with a projection of the pixel-defining layer 28 on the substrate 10 (i.e., the lens elements 40 are located above the pixel-defining layer 28 );

[0083] a light-transmitting layer 60 disposed on a side of the encapsulation layer 30 away from the light-emitting layer 20 , with at least a portion of the light-transmitting layer 60 located between adjacent lens elements 40 , and a projection of the light-transmitting layer 60 on the substrate 10 at least partially overlapping with a projection of the light-emitting unit 22 on the substrate 10 (i.e., the light-transmitting layer 60 is located above the light-emitting unit 22 ), so that light emitted by the light-emitting unit 22 can pass through and enter the user's eyes;

[0084] The lens element 40 has a side surface 41 in contact with the light-transmitting layer 60 . The refractive index of the lens element 40 at the side surface 41 is lower than the refractive index of the light-transmitting layer 60 .

[0085] In the above embodiment, by providing the lens element 40, the light emitting effect of the display panel is effectively improved. Specifically, a portion of the light emitted by the light-emitting unit 22 will directly pass through the light-transmitting layer 60 into the user's eyes, and the other portion will be irradiated onto the side surface 41 of the lens element 40. At the above-mentioned side surface 41, when the incident angle of the light (for example, the light L1) is greater than the critical angle of total reflection, total reflection will occur, and the light L2 formed by the reflection will directly enter the user's eyes through the light-transmitting layer 60; when the incident angle of the light (for example, the light L3) is less than the critical angle of total reflection, refraction will occur, and the refracted light L4 and L5 will also enter the user's eyes through the lens element 40. As a result, the light emitting efficiency of the display panel is significantly improved.

[0086] Continue to refer to Figure 6 In some embodiments, the lens element 40 includes a first lens 45 and a second lens 47 stacked together, wherein the first lens 45 is disposed adjacent to the encapsulation layer 30, and the second lens 47 is located on a side of the first lens 45 away from the encapsulation layer 30. Furthermore, the second lens 47 is away from the surface of the first lens 45 ( Figure 6 The upper surface of the second lens 47 is a light-emitting surface 470 that allows light to pass through. For example, Figure 6 Light L3 is first refracted into lens element 40 to form light L4, and then refracted again at light-exit surface 470 (the upper surface of second lens 47) to form light L5, which then enters the user's eye. After being adjusted by lens element 40, light L5 is closer to the normal viewing angle than the original light L3, thereby improving the light extraction efficiency of the display panel at normal viewing angles.

[0087] The projection of the first lens 45 on the substrate 10 generally falls completely within the projection of the pixel defining layer 28 on the substrate 10. That is, the first lens 45 does not extend directly above the light emitting unit 22. The distance between the boundary of the lower surface of the first lens 45 and the boundary of the pixel defining layer 28 can generally be set to 0 to 5 microns.

[0088] In some embodiments, the light emitting surface 470 of the second lens 47 is in the shape of a broken line, and the broken line is formed by connecting two or more straight lines. In some embodiments, the light emitting surface 470 of the second lens 47 is in the shape of an arc. The arc can be a standard circular arc or an irregular curve. Regardless of whether it is in the shape of a broken line or an arc, the light emitting surface 470 of the second lens 47 is preferably in a continuously changing gradient shape. For example, along the direction from the center of the light emitting surface 470 to the edge of the light emitting surface 470, the distance between the light emitting surface 470 and the encapsulation layer 30 gradually increases, such as Figure 6 、 Figure 7 and Figure 8 As shown. In this case, it is equivalent to providing a groove on the light-emitting surface 470 of the second lens 47. The cross section of the groove is preferably an inverted isosceles triangle. The slope of the groove can be 10 degrees to 35 degrees, preferably 20 degrees. For another example, along the direction from the center of the light-emitting surface 470 to the edge of the light-emitting surface 470, the distance between the light-emitting surface 470 and the encapsulation layer 30 gradually decreases, as shown in FIG. Figure 9 and Figure 10 The above-mentioned gradient design of the light-emitting surface 470 is conducive to further improving the light-emitting efficiency.

[0089] In some embodiments, the first lens 45 and the second lens 47 are made of the same material, and the contact surface between the first lens 45 and the second lens 47 is a plane. In some embodiments, the lens element 40 may include only one lens, and the morphology of the lens is the same as the overall morphology of the first lens 45 and the second lens 47.

[0090] In some embodiments, the width of the lens element 40 gradually decreases in the direction away from the encapsulation layer 30. That is, the lens element 40 is narrow at the top and wide at the bottom. In some embodiments, the slope angle formed by the side surface 41 and the encapsulation layer 30 is greater than or equal to 45 degrees and less than 90 degrees. Preferably, the slope angle is greater than or equal to 45 degrees and less than or equal to 70 degrees. More preferably, the slope angle is about 55 degrees. After multiple experiments, it has been verified that the shape of the lens element 40 being narrow at the top and wide at the bottom and the setting of the above-mentioned slope angle are conducive to further improving the light extraction efficiency of the display panel.

[0091] In some embodiments, the light-transmitting layer 60 and the first lens 45 and the second lens 47 are made of optical adhesives of different materials. The refractive index of the light-transmitting layer 60 is 1.65 to 1.7, and the refractive index of the first lens 45 and the second lens 47 is 1.45 to 1.5.

[0092] In some embodiments, the light-transmitting layer 60 is a planarization layer, which is filled between adjacent lens elements 40 and covers the side of the lens element 40 away from the packaging layer 30, such as Figure 6 、 Figure 7 and Figure 9 shown.

[0093] The lens element 40 may further include a third lens 49 having a refractive index greater than that of the first lens 45 and the second lens 47. In some embodiments, the refractive index of the third lens 49 is greater than not only that of the first lens 45 and the second lens 47, but also that of the light-transmitting layer 60. For example, the third lens 49 may be made of an optical adhesive having a refractive index of 1.7.

[0094] In some embodiments, the third lens 49 is disposed on a side of the second lens 47 away from the encapsulation layer 30, such as Figure 7 、 Figure 8 and Figure 10 In some embodiments, the third lens 49 is directly disposed on the side of the first lens 45 away from the encapsulation layer 30, and the second lens 47 is no longer disposed. Figure 11 In some embodiments, the side of the third lens 49 away from the encapsulation layer 30 is covered by a light-transmitting layer 60, as shown in FIG. Figure 7 In some embodiments, the side of the third lens 49 away from the encapsulation layer 30 is not covered by the light-transmitting layer 60, as shown in FIG. Figure 8 、 Figure 10 and Figure 11 By providing the third lens 49, the light can be further adjusted so that the light formed after adjustment by the lens element 40 is closer to the direction of the normal viewing angle, thereby improving the light extraction efficiency of the display panel at the normal viewing angle.

[0095] In some embodiments, each light-emitting unit 22 includes a light-emitting material layer 23 and two electrodes located on both sides of the light-emitting material layer 23 . Figure 6 Only the anode 25 located below the light emitting material layer 23 is shown.

[0096] After simulation testing, the light output gain of traditional display panels is 12%. Figures 6 to 10 The light output gains of the display panels are 14.30%, 16.10%, 16.30%, 14.50% and 16.20% respectively, which are significantly better than traditional display panels in terms of light output gain. Figure 11 The light output gain of the display panel is 12.80%, which is also better than traditional display panels in terms of light output gain.

[0097] An embodiment of the present application further provides a display device, comprising any of the above-mentioned display panels.

[0098] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements. The term "plurality" refers to two or more, unless otherwise expressly defined.

[0099] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0100] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display panel, characterized in that: include: substrate; a light-emitting layer disposed on one side of the substrate, comprising a plurality of light-emitting units disposed at intervals, with a pixel defining layer disposed between adjacent light-emitting units; an encapsulation layer, disposed on a side of the light-emitting layer away from the substrate; a plurality of lens elements disposed on a side of the encapsulation layer away from the light-emitting layer, wherein a projection of the lens element on the substrate at least partially overlaps with a projection of the pixel defining layer on the substrate, the lens element comprising a first lens and a second lens stacked together, the first lens being disposed adjacent to the encapsulation layer, and the second lens being located on a side of the first lens away from the encapsulation layer; a light-transmitting layer, disposed on a side of the encapsulation layer away from the light-emitting layer, wherein at least a portion of the light-transmitting layer is located between adjacent lens elements, and a projection of the light-transmitting layer on the substrate at least partially overlaps with a projection of the light-emitting unit on the substrate; The lens element has a side surface in contact with the light-transmitting layer, and the refractive index of the lens element at the side surface is lower than the refractive index of the light-transmitting layer.

2. The display panel according to claim 1, wherein A first reflective layer is provided on a surface of the lens element adjacent to the packaging layer, and a second reflective layer is provided on a surface of the lens element away from the packaging layer. The first reflective layer and the second reflective layer are arranged face to face.

3. The display panel according to claim 2, wherein: A protrusion is provided between the lens element and the packaging layer. The protrusion has a bottom surface adjacent to the packaging layer and a top surface adjacent to the lens element. The top surface is convex toward the lens element. The first reflective layer is provided on the top surface.

4. The display panel according to claim 3, wherein: The material of the protrusions includes a photosensitive material.

5. The display panel according to claim 3, wherein: The first reflective layer is in a broken line shape or an arc shape, and the distance between the first reflective layer and the encapsulation layer gradually decreases along a direction from the center to the edge.

6. The display panel according to claim 2, wherein: The material of the first reflective layer and / or the second reflective layer includes silver.

7. The display panel according to claim 2, wherein: The display panel further includes a black matrix block, the black matrix block is located on a side of the lens element away from the encapsulation layer, and a projection of the black matrix block on the substrate at least partially overlaps with a projection of the lens element on the substrate; The black matrix block has a lower surface adjacent to the lens element and an upper surface away from the lens element, and the second reflective layer is in contact with the lower surface.

8. The display panel according to claim 7, wherein: The second reflective layer is in a broken line shape or an arc shape, and the distance between the second reflective layer and the encapsulation layer gradually increases from the center to the edge.

9. The display panel according to claim 2, wherein: A slope angle formed between the side surface and the packaging layer is greater than or equal to 45 degrees and less than 90 degrees.

10. The display panel according to claim 2, wherein: The refractive index of the light-transmitting layer is 1.65 to 1.7, and the refractive index of the lens element is 1.45 to 1.

5.

11. The display panel according to claim 2, wherein: The light-transmitting layer is a planarization layer, which is filled between adjacent lens elements; The display panel further includes a filter layer formed on a side of the light-transmitting layer and the lens element away from the encapsulation layer.

12. The display panel according to claim 2, wherein: The light-transmitting layer is a portion of a filter layer, a portion of the filter layer is filled between adjacent lens elements as the light-transmitting layer, and another portion of the filter layer is formed on a side of the light-transmitting layer and the lens elements away from the packaging layer.

13. The display panel according to claim 12, wherein: The filter layer includes a red filter layer, a green filter layer and a blue filter layer; The side surface of the lens element contacts the filter layer as a light-transmitting layer, and the slope angle between the side surface and the encapsulation layer is greater than or equal to 45 degrees and less than 90 degrees; The slope angles formed by different side surfaces contacting different color filter layers are different.

14. The display panel according to claim 13, wherein: The slope angle of the side surface in contact with the red filter layer is greater than or equal to 65 degrees and less than or equal to 70 degrees; The slope angle of the side surface in contact with the green filter layer is greater than or equal to 55 degrees and less than or equal to 60 degrees; The slope angle of the side surface contacting the blue filter layer is greater than or equal to 45 degrees and less than or equal to 50 degrees.

15. The display panel according to claim 1, wherein A surface of the second lens away from the first lens is a light-emitting surface allowing light to pass through.

16. The display panel according to claim 15, wherein: The light-emitting surface of the second lens is in a broken line shape or an arc shape; and the distance between the light-emitting surface and the encapsulation layer gradually increases or decreases from the center of the light-emitting surface to the edge of the light-emitting surface.

17. The display panel according to claim 2 or 15, wherein: The first lens and the second lens are made of the same material, and a contact surface between the first lens and the second lens is a plane.

18. The display panel according to claim 2 or 15, wherein: The width of the lens element gradually decreases in a direction away from the encapsulation layer.

19. The display panel according to claim 15, wherein: The lens element further includes a third lens, which is disposed on a side of the second lens or the first lens away from the encapsulation layer. The refractive index of the third lens is greater than the refractive index of the first lens and / or the second lens.

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

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