Display panel and display device

Abstract

The invention relates to a display panel and a display device. The display panel comprises a light-emitting layer, a first refraction layer and a second refraction layer. The light-emitting layer comprises a plurality of light-emitting units, the first refraction layer is located on the light-emitting side of the light-emitting layer and comprises a plurality of protruding structures corresponding to the light-emitting units, and each protruding structure comprises a bottom close to one side of the corresponding light-emitting unit and a side wall connected with the bottom. The second refraction layer is located on one side of the first refraction layer away from the light-emitting layer. Wherein the second refraction layer at least covers the side wall of the protruding structure, the included angle between the side wall and the bottom is larger than or equal to 90 degrees, and the refractive index of the second refraction layer is smaller than that of the first refraction layer. The light-emitting efficiency of the display panel can be improved, the power consumption of a product can be reduced, the material cost is reduced, and the refractive index, viscosity, high-temperature stability and other performance of the material are considered.

Description

Technical Field

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

[0002] Organic light-emitting diode (OLED) devices are being used in a wide range of fields due to their advantages over traditional liquid crystal displays (LCDs), such as lightweight, wide viewing angles, and high luminous efficiency. As OLED display products develop towards larger sizes, higher frequencies, and higher colors, higher requirements are being placed on the luminous efficiency and performance of OLED devices.

[0003] Traditional OLED device fabrication techniques typically incorporate a high-refractive-index adhesive on the side of the encapsulation layer facing away from the light-emitting layer to form a light-extraction structure. This technique improves the light output of OLED devices and reduces power consumption. However, due to the difficulties in developing high-refractive-index adhesive materials, current materials struggle to balance key performance parameters such as refractive index, viscosity, and high-temperature stability. This results in increased production costs and decreased stability of display panels, hindering further improvements in their overall performance. Summary of the Invention

[0004] The embodiments of the present application provide a display panel and a display device, which can improve the luminous efficiency of the display panel and reduce the power consumption of the product while reducing material costs and taking into account the performance of the material such as refractive index, viscosity and high-temperature stability.

[0005] In order to achieve the above-mentioned objective, according to a first aspect of the present application, a display panel is provided, comprising:

[0006] a light-emitting layer comprising a plurality of light-emitting units;

[0007] A first refractive layer is located on the light-emitting side of the light-emitting layer and includes a plurality of protruding structures arranged in a one-to-one correspondence with the plurality of light-emitting units; the protruding structures include a bottom close to one side of the light-emitting unit and a sidewall connected to the bottom;

[0008] a second refractive layer, located on a side of the first refractive layer away from the light-emitting layer;

[0009] The second refractive layer at least covers the sidewall of the protruding structure, the angle between the sidewall and the bottom is greater than or equal to 90°, and the refractive index of the second refractive layer is less than that of the first refractive layer.

[0010] Optionally, the refractive index of the first refractive layer is less than or equal to 1.55.

[0011] Optionally, a refractive index difference between the first refractive layer and the second refractive layer is greater than or equal to 0.05.

[0012] Optionally, the refractive index of the first refractive layer is greater than or equal to 1.45 and less than or equal to 1.55; and the refractive index of the second refractive layer is less than or equal to 1.45.

[0013] Optionally, the angle between the side wall and the bottom is less than or equal to 120°.

[0014] Optionally, the angle between the side wall and the bottom is greater than or equal to 95° and less than or equal to 115°.

[0015] Optionally, a projection of the protruding structure in the thickness direction of the display panel completely covers a projection of the corresponding light-emitting unit in the thickness direction of the display panel.

[0016] Optionally, the light-emitting layer further comprises a pixel definition layer; the pixel definition layer is provided with a plurality of pixel openings arranged in a one-to-one correspondence with the plurality of light-emitting units, and the light-emitting units are arranged in the corresponding pixel openings;

[0017] The diameter of the bottom of the protruding structure is greater than or equal to the diameter of the corresponding pixel opening on a side close to the first refractive layer.

[0018] Optionally, a difference between a diameter of the bottom of the protruding structure and a diameter of the corresponding pixel opening on a side close to the first refractive layer is greater than or equal to 0 and less than or equal to 5 micrometers.

[0019] Optionally, a side of the second refractive layer facing away from the first refractive layer is flat; and along the thickness direction of the display panel, a thickness of the protruding structure is 10% to 20% of the maximum thickness of the second refractive layer.

[0020] Optionally, the thickness of the protruding structure in the thickness direction of the display panel is greater than or equal to 2 micrometers and less than or equal to 4 micrometers.

[0021] Optionally, the material of the first refractive layer is selected from at least one of epoxy resin, acrylic resin and polymethacrylate;

[0022] The material of the second refractive layer is selected from at least one of silicone, acrylic resin, polymethacrylate and thermoplastic polyurethane.

[0023] Optionally, a peeling force between the second refractive layer and an adjacent film layer is greater than or equal to 500 grams-force.

[0024] Optionally, the display panel further includes a polarizer, and the polarizer is located on a side of the second refractive layer away from the first refractive layer; the second refractive layer is in direct contact with the polarizer.

[0025] Optionally, the display panel further includes an encapsulation layer and a touch layer sequentially arranged on the light-emitting side of the light-emitting layer, and the first refractive layer and the second refractive layer are located on a side of the touch layer away from the light-emitting layer.

[0026] According to a second aspect of the present application, a display device is provided, comprising the display panel described above.

[0027] In the display panel and display device of the embodiments of the present application, the raised structures of the first refractive layer are arranged corresponding to the light-emitting units of the light-emitting layer, and the second refractive layer is located on a side of the first refractive layer facing away from the light-emitting layer and covers at least the sidewalls of the raised structures. Because the refractive index of the first refractive layer is greater than that of the second refractive layer, and the angle between the sidewalls and the bottom of the raised structures is greater than or equal to 90°, light with a wide viewing angle emitted by the light-emitting units can be totally reflected when it passes through the bottom of the raised structures and is incident on the sidewalls of the raised structures. This can thereby reflect the light with a wide viewing angle in the normal viewing direction, thereby improving light extraction efficiency in the normal viewing direction and reducing power consumption of the display panel. Furthermore, because the raised structures with a larger refractive index are arranged corresponding to the light-emitting units, when the second refractive layer with a smaller refractive index completely fills between the multiple raised structures to achieve contact with the sidewalls of the raised structures, the area of ​​the second refractive layer on the side closest to the light-emitting layer is much larger than the area of ​​the bottom of the raised structures, and the side of the second refractive layer away from the light-emitting layer completely covers the raised structures. This allows the second refractive layer with a smaller refractive index to be bonded to the upper and lower film layers using a low-refractive-index adhesive. Because low-refractive-index adhesives are more readily available than high-refractive-index adhesives and have higher viscosity and better high-temperature stability than high-refractive-index adhesives, when the second refractive layer is selected from a low-refractive-index adhesive, the second refractive layer can simultaneously meet the requirements for refractive index, viscosity, and high-temperature stability, while avoiding the need for high-refractive-index adhesive material development, which helps reduce material costs. Therefore, the first and second refractive layers provided in the embodiments of the present application can cooperate to improve the luminous efficiency of the display panel and reduce product power consumption, while reducing material costs and taking into account the material's refractive index, viscosity, and high-temperature stability.

[0028] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0030] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0031] Figure 1 is a schematic diagram of a partial structure of an exemplary OLED display panel provided in this application;

[0032] Figure 2 is a schematic diagram of a partial structure of a display panel provided in an embodiment of the present application;

[0033] Figure 3 It is a structural schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] With the development of OLED technology, improving the luminous efficiency of OLED devices and reducing the power consumption of OLED devices are important requirements for mobile devices.

[0036] Usually, such as Figure 1 As shown, the OLED display panel 100 includes a light emitting layer 101, an encapsulation layer 102, a touch layer 103 and a polarizer 104 which are sequentially arranged on the light emitting side of the light emitting layer 101. Figure 1As shown, in order to improve the light extraction efficiency of the OLED display panel 100, an organic cover (OC) layer 105 having an opening can be provided on the surface of the touch layer 103, the opening 106 of the organic cover layer 105 is overlapped with the light-emitting unit 107 of the light-emitting layer 101, and the angle between the side wall of the opening 106 and the bottom of the opening 106 is an obtuse angle; at the same time, a high refractive index material 108 is filled in the opening 106 of the organic cover layer 105, and the refractive index of the material 108 is greater than the refractive index of the organic cover layer 105. Since the refractive index of the material 108 filled in the opening 106 is greater than the refractive index of the organic cover layer 105, total reflection will occur when the light emitted by the light-emitting layer 101 is incident on the side wall of the opening 106 of the organic cover layer 105 through the high-refractive-index filling material 108. The total reflection effect can change the light output path of the light-emitting layer, and the light originally diverging to a large viewing angle can be converged to be emitted at a positive viewing angle (such as the light shown by L1' and L2'), thereby improving the brightness at a positive viewing angle.

[0037] When the high refractive index material 108 is an adhesive, it can be directly used to bond the upper polarizer 104 or other film structures, which is beneficial to reducing the number of film layers, thereby simplifying the manufacturing process of the OLED display panel 100 and facilitating the realization of narrow frame or bending performance. Figure 1 The application of the light extraction technology shown is limited because, regardless of whether a high-refractive-index monomer or a high-refractive-index particle-doped solution is used, the viscosity of the adhesive itself is affected, making it difficult to balance the adhesive's refractive index, viscosity, and high-temperature stability, which are important indicators.

[0038] In order to solve the above problems, this application Figure 1 The structure and materials of the OLED display panel shown here have been improved. A low-refractive-index adhesive is used in conjunction with existing organic cover materials to form a fully reflective interface on the light-emitting side of the light-emitting layer. This improves luminous efficiency and reduces product power consumption while maintaining the adhesive's high viscosity and high-temperature stability. For details, please refer to the following examples.

[0039] like Figure 2As shown, an embodiment of the present application provides a display panel 1, which includes a light-emitting layer 2, a first refractive layer 3, and a second refractive layer 4. The light-emitting layer 2 includes a plurality of light-emitting units 5. The first refractive layer 3 is located on the light-emitting side of the light-emitting layer 2 and includes a plurality of protruding structures 6 arranged corresponding to the plurality of light-emitting units 5. The protruding structures 6 include a bottom 7 on a side close to the light-emitting unit 5 and a sidewall 8 connected to the bottom 7. The second refractive layer 4 is located on a side of the first refractive layer 3 facing away from the light-emitting layer 2, and the second refractive layer 4 at least covers the sidewall 8 of the protruding structure 6. The angle θ between the sidewall 8 and the bottom 7 is greater than or equal to 90°, and the refractive index of the second refractive layer 4 is less than the refractive index of the first refractive layer 3.

[0040] As will be understood, the first refractive layer 3 is composed of a plurality of raised structures 6, each of which is arranged corresponding to the light-emitting units 5. During the production of the first refractive layer 3, portions of the first refractive layer 3 corresponding to the non-luminescent area are removed to form openings, while portions of the first refractive layer 3 corresponding to the luminescent area are retained to form the raised structures 6. The second refractive layer 4 is filled in the openings of the first refractive layer 3, so that the second refractive layer 4 directly contacts the sidewalls 8 of the raised structures 6. When the second refractive layer 4 covers the entire raised structure 6, it can directly contact the upper film layer.

[0041] In the embodiment of the present application, the protruding structures 6 of the first refractive layer 3 are arranged corresponding to the light-emitting units 5 of the light-emitting layer 2, and the second refractive layer 4 is located on the side of the first refractive layer 3 facing away from the light-emitting layer 2, and at least covers the sidewalls 8 of the protruding structures 6. Since the refractive index of the first refractive layer 3 is greater than the refractive index of the second refractive layer 4, and the angle θ between the sidewalls 8 and the bottom 7 of the protruding structure 6 is greater than or equal to 90°, when the light with a wide viewing angle emitted by the light-emitting unit 5 passes through the bottom 7 of the protruding structure 6 and is incident on the sidewalls 8 of the protruding structure 6, total internal reflection can occur, thereby reflecting the light with a wide viewing angle in the direction of the normal viewing angle (e.g., Figure 1), which helps improve the light extraction efficiency in the normal viewing angle direction and helps reduce the power consumption of the display panel 1. At the same time, because the raised structures 6 with a larger refractive index are arranged corresponding to the light-emitting units 5, when the second refractive layer 4 with a smaller refractive index is completely filled between the multiple raised structures 6 to achieve contact with the sidewalls 8 of the raised structures 6, the area of ​​the second refractive layer 4 on the side close to the light-emitting layer 2 is much larger than the area of ​​the bottom 7 of the raised structures 6, and the second refractive layer 4 on the side away from the light-emitting layer 2 completely covers the raised structures 6. This allows the second refractive layer 4 with a smaller refractive index to be selected from a low-refractive-index adhesive to bond the upper and lower film layers. Since low-refractive-index adhesives are more readily available than high-refractive-index adhesives and have higher viscosity and better high-temperature stability than high-refractive-index adhesives, when the second refractive layer 4 is selected from a low-refractive-index adhesive, the second refractive layer 4 can simultaneously meet the requirements of refractive index, viscosity, and high-temperature stability, and can avoid the development of materials for high-refractive-index adhesives, which helps reduce material costs.

[0042] Therefore, the first refractive layer 3 and the second refractive layer 4 provided in the embodiment of the present application cooperate with each other to improve the luminous efficiency of the display panel 1 and reduce product power consumption, while reducing material costs and taking into account the material's refractive index, viscosity, high-temperature stability and other properties.

[0043] In some embodiments, the display panel 1 further includes a substrate layer 9, a driving circuit layer 10 and an encapsulation layer 11, the driving circuit layer 10 is arranged on the substrate layer 9, the light-emitting layer 2 is arranged on the side of the driving circuit layer 10 away from the substrate layer 9, and the encapsulation layer 11 covers the light-emitting layer 2.

[0044] It can be understood that the light emitting unit 5 is electrically connected to the driving circuit in the driving circuit layer 10 , and the driving circuit is used to drive the light emitting unit 5 to emit light.

[0045] In some embodiments, the substrate layer 9 may be a rigid substrate. For example, the substrate layer 9 may be selected from glass, quartz, plastic, and the like.

[0046] In other embodiments, the substrate layer 9 may be a flexible substrate. For example, the material of the substrate layer 9 may be selected from polyethylene terephthalate (PET), polyethylene naphthalate diformic acid glycol ester (PEN), or polyimide (PI).

[0047] In some embodiments, the first refractive layer 3 and the second refractive layer 4 are disposed on a side of the encapsulation layer 11 facing away from the light emitting layer 2 .

[0048] In another embodiment, the display panel 1 further includes a touch layer 12 , which is disposed on a side of the encapsulation layer 11 away from the light emitting layer 2 , and the first refractive layer 3 and the second refractive layer 4 are disposed on a side of the touch layer 12 away from the light emitting layer 2 .

[0049] In some embodiments, the encapsulation layer 11 includes a first sub-encapsulation layer, a second sub-encapsulation layer, and a third sub-encapsulation layer stacked in sequence. The first and third sub-encapsulation layers may be made of inorganic materials, such as silicon nitride, silicon oxide, or silicon oxynitride. Inorganic materials have high density and can prevent water and oxygen intrusion. The second sub-encapsulation layer may be made of an organic material, such as a polymer containing a desiccant or a polymer that can block moisture, such as a polymer resin.

[0050] In some embodiments, the light-emitting layer 2 further includes a pixel definition layer 13 disposed between the driving circuit layer 10 and the encapsulation layer 11 ; the pixel definition layer 13 is provided with a plurality of pixel openings 14 corresponding one to one with the plurality of light-emitting units 5 , and the light-emitting units 5 are disposed in the corresponding pixel openings 14 .

[0051] It can be understood that the opening on the first refractive layer 3 and the pixel opening 14 are not overlapped in the thickness direction of the display panel 1 .

[0052] In some embodiments, the light emitting unit 5 is an OLED device, which is composed of an anode, an organic light emitting functional layer, and an anode stacked in the pixel opening 14. Of course, the embodiment of the present application does not limit the structure and type of the light emitting unit 5.

[0053] In some embodiments, the light emitted by each light emitting unit 5 includes any one of red (R) light, green (G) light and blue (B) light, but is not limited thereto. That is, the light emitting unit 5 includes any one of a red light emitting device, a green light emitting device and a blue light emitting device.

[0054] In some embodiments, the diameter of the pixel opening 14 close to the driving circuit layer 10 is smaller than the diameter of the pixel opening 14 close to the encapsulation layer 11. For example, the cross-sectional shape of the pixel opening 14 in the thickness direction of the display panel 1 is an inverted trapezoid, but is not limited thereto.

[0055] In some embodiments, a protruding structure 6 is provided on the light-emitting side of each light-emitting unit 5, so that the wide-angle light emitted by each light-emitting unit 5 can be totally reflected on the side wall 8 of the protruding structure 6 and then emitted in a direction close to the normal viewing angle, thereby improving the light extraction efficiency.

[0056] In some embodiments, the angle θ between the sidewall 8 and the bottom 7 of the protrusion structure 6 (referred to as Taper angle) is less than or equal to 120°.

[0057] In a preferred embodiment, the taper angle of the protruding structure 6 is greater than or equal to 95° and less than or equal to 115°.

[0058] After research, the applicant found that the size of the Taper angle of the raised structure 6 is limited by several aspects. For example, when the Taper angle of the raised structure 6 is too small, the light emitted by the light-emitting unit 5 cannot be irradiated onto the side wall 8 of the raised structure 6 according to the required path, and thus total reflection cannot occur; when the Taper angle of the raised structure 6 is too large, it is not easy to meet the requirements of the total reflection incident angle, or the light emitted after total reflection cannot be converged to the positive viewing angle. When the Taper angle is set in the range of 90° to 120°, it can be ensured that the light with a large viewing angle emitted by the light-emitting unit 5 can be smoothly incident on the side wall 8 of the raised structure 6, thereby causing total reflection to improve the light extraction efficiency. When the Taper angle is set in the range of 95° to 115°, more and larger-range light with a large viewing angle can be allowed to be incident on the side wall 8 of the raised structure 6, thereby causing total reflection and further improving the light extraction efficiency.

[0059] In a preferred embodiment, the taper angle of the protruding structure 6 is equal to 105°.

[0060] In some embodiments, the projection of the raised structure 6 along the thickness direction of the display panel 1 completely covers the projection of the corresponding light-emitting unit 5 along the thickness direction of the display panel 1. In other words, the projected area of ​​the raised structure 6 along the thickness direction of the display panel 1 is greater than or equal to the projected area of ​​the corresponding light-emitting unit 5 along the thickness direction of the display panel 1. This design facilitates that most of the wide-angle light emitted by the light-emitting unit 5 is incident on the sidewall 8 of the raised structure 6, thereby causing total internal reflection and improving light extraction efficiency.

[0061] In one embodiment, the diameter D1 of the bottom 7 of the protrusion structure 6 is greater than or equal to the diameter D2 of the corresponding pixel opening 14 on the side close to the first refractive layer 3. This design allows light from a wider viewing angle range to be totally reflected on the sidewall 8 of the protrusion structure 6, thereby reflecting more light in the normal viewing direction, which helps to further improve the light extraction efficiency of the display panel 1.

[0062] In some embodiments, the difference between the diameter of the bottom 7 of the protrusion structure 6 and the diameter of the corresponding pixel opening 14 on the side close to the first refractive layer 3 is greater than or equal to 0 and less than or equal to 5 micrometers.

[0063] In a preferred embodiment, the difference between the diameter of the bottom 7 of the protrusion structure 6 and the diameter of the corresponding pixel opening 14 on the side close to the first refractive layer 3 is greater than or equal to 0 and less than or equal to 3 micrometers.

[0064] After research, the applicant found that controlling the difference between the diameter of the bottom 7 of the protruding structure 6 and the diameter of the corresponding pixel opening 14 on the side close to the first refractive layer 3 within the range of 0 to 5 microns is conducive to most of the wide-angle light emitted by the light-emitting unit 5 being incident on the side wall 8 of the protruding structure 6, thereby causing total reflection; controlling the difference between the diameter of the bottom 7 of the protruding structure 6 and the diameter of the corresponding pixel opening 14 on the side close to the first refractive layer 3 within the range of 0 to 3 microns can avoid the bottom 7 of the protruding structure 6 being too large, which can cause part of the wide-angle light emitted by the light-emitting unit 5 to be directly emitted from the upper surface of the protruding structure 6, thereby reducing the improvement in light extraction efficiency.

[0065] In some embodiments, the refractive index of the first refractive layer 3 is less than 1.55. Because the refractive index of the first refractive layer 3 is less than 1.55, both the first refractive layer 3 and the second refractive layer 4 are made of low-refractive-index materials. Therefore, the material for the first refractive layer 3 can be selected from conventional organic cover (OC) materials, while the material for the second refractive layer 4 can be selected from silicone-based materials, eliminating the need for additional high-refractive-index materials and reducing material costs. Furthermore, because low-refractive-index adhesives have higher viscosity and better high-temperature stability than high-refractive-index adhesives, when both the first refractive layer 3 and the second refractive layer 4 are made of adhesives, they can simultaneously meet the requirements for refractive index, viscosity, and high-temperature stability.

[0066] In some embodiments, the difference in refractive index between the first refractive layer 3 and the second refractive layer 4 is greater than or equal to 0.05. In a preferred embodiment, the difference in refractive index between the first refractive layer 3 and the second refractive layer 4 is greater than or equal to 0.08. The applicant has discovered through research that when the difference in refractive index between the first refractive layer 3 and the second refractive layer 4 is greater than or equal to 0.05, the light extraction efficiency of the display panel 1 can be effectively improved, and when the difference in refractive index between the first refractive layer 3 and the second refractive layer 4 is greater than or equal to 0.08, the light extraction efficiency of the display panel 1 can be further improved.

[0067] In some embodiments, the refractive index of the first refractive layer 3 is greater than or equal to 1.45 and less than or equal to 1.55. The material of the first refractive layer 3 is selected from at least one of epoxy-based organic materials and acrylic-based organic materials that meet the refractive index requirements.

[0068] In a specific embodiment, the material of the first refractive layer 3 is selected from at least one of epoxy resin, acrylic resin and polymethacrylate.

[0069] As an example, the refractive index of the first refractive layer 3 is 1.51, but is not limited thereto.

[0070] In some embodiments, the refractive index of the second refractive layer 4 is less than or equal to 1.45. The material of the second refractive layer 4 is selected from silicone-based organic materials, acrylic-based organic materials, thermoplastic polyurethane (TPU)-based organic materials, or organic materials doped with low-refractive-index particles that meet the refractive index requirements.

[0071] In a specific embodiment, the material of the second refractive layer 4 is selected from at least one of silicone, acrylic resin, polymethacrylate and thermoplastic polyurethane.

[0072] When the second refractive layer 4 is also configured as an adhesive layer for bonding the upper polarizer 15 or other film layers, the material of the second refractive layer 4 is preferably selected from silicone-based organic materials. For example, the material of the second refractive layer 4 can be selected from a material mainly composed of linear polysiloxane. This type of material can not only meet the low refractive index requirement of the second refractive layer 4, but also make the second refractive layer 4 have high viscosity and high-temperature stability, and can be used as a low-refractive-index adhesive.

[0073] In some embodiments, the second refractive layer 4 is positioned between any two adjacent protrusions 6, and the side of the second refractive layer 4 facing away from the light-emitting layer 2 is flat. Therefore, the side of the second refractive layer 4 closest to the light-emitting layer 2 can make contact with the underlying film layer over a large area, while the side of the second refractive layer 4 facing away from the light-emitting layer 2 can make contact with the entire surface of the upper film layer. When the material of the second refractive layer 4 is a low-refractive-index adhesive, the second refractive layer 4 can be used directly to bond the upper and lower film layers.

[0074] In some embodiments, the peeling force between the second refractive layer 4 and the adjacent film layer is greater than or equal to 500 gf. In this case, the second refractive layer 4 has high viscosity.

[0075] In one specific embodiment, the display panel 1 further includes a polarizer 15 located on the side of the second refractive layer 4 facing away from the light-emitting layer 2. The second refractive layer 4 is interposed between the first refractive layer 3 and the polarizer 15, and the peeling force between the second refractive layer 4 and the adjacent film layer is greater than or equal to 500 grams-force. In this case, the second refractive layer 4 is in direct contact with the polarizer 15. In addition to cooperating with the first refractive layer 3 to improve the light extraction efficiency of the display panel 1, the second refractive layer 4 can also directly serve as an adhesive to firmly secure the polarizer 15 to the first refractive layer 3. This avoids the need for an adhesive layer such as a photosensitive adhesive on the polarizer 15, thereby reducing the number of film layers and simplifying the manufacturing process of the polarizer 15.

[0076] In some embodiments, the polarizer 15 in the embodiment of the present application can also be replaced by a color filter with a filtering function, but is not limited thereto.

[0077] In some embodiments, the side of the second refractive layer 4 facing away from the first refractive layer 3 is flat, and along the thickness direction of the display panel 1, the thickness of the protruding structure 6 is 10% to 20% of the maximum thickness of the second refractive layer 4. By adjusting the thickness relationship between the protruding structure 6 and the second refractive layer 4, the filling effect of the second refractive layer 4 can be ensured and good optical performance and bonding effects can be achieved.

[0078] It should be noted that the maximum thickness of the second refractive layer 4 refers to the distance between the side of the second refractive layer 4 facing away from the light-emitting layer 2 and the plane where the bottom 7 of the protruding structure 6 is located, that is, the thickness of the part of the second refractive layer 4 filled between the multiple protruding structures 6 along the thickness direction of the display panel 1.

[0079] In some embodiments, the thickness of the protrusion structure 6 in the thickness direction of the display panel 1 is greater than or equal to 2 micrometers and less than or equal to 4 micrometers.

[0080] In a preferred embodiment, the thickness of the protrusion structure 6 in the thickness direction of the display panel 1 is greater than or equal to 2.5 micrometers and less than or equal to 3.5 micrometers.

[0081] The applicant has discovered that when the second refractive layer 4 is used as an adhesive layer to bond upper and lower film layers (e.g., polarizer 15), the thickness of the second refractive layer 4 is approximately 20 microns. In this case, setting the thickness of the first refractive layer 3 within the range of 2 to 4 microns ensures that the length of the sidewalls 8 of the protruding structures 6 is sufficient to receive the wide-angle light emitted by the light-emitting unit 5, thereby ensuring that a sufficient amount of wide-angle light is reflected in the normal viewing direction. At the same time, the first refractive layer 3 can fully fill the gaps between the multiple protruding structures 6 to achieve direct contact with the sidewalls 8 of the protruding structures 6. Furthermore, the second refractive layer 4 can also cover the side of the first refractive layer 3 facing away from the light-emitting layer 2 to achieve sufficient direct contact with the upper film layer, thereby simultaneously ensuring the bonding effect between the upper and lower film layers. Setting the thickness of the first refractive layer 3 within the range of 2.5 to 3.5 microns can further increase the filling density of the second refractive layer 4 between the protruding structures 6 and ensure that the thickness of the second refractive layer 4 on the side of the first refractive layer 3 facing away from the light-emitting layer 2 is sufficiently large, thereby further improving the optical effect and bonding effect.

[0082] In some embodiments, the raised junctions may be fabricated by photolithography, but are not limited thereto.

[0083] The present application also provides six groups of comparative examples and embodiments, and tests and analyzes the differences in luminous efficiency of the display panels provided by the six groups of comparative examples and embodiments.

[0084] Comparative Example 1 and Example 1

[0085] Comparative Example 1 provides a Figure 1In the first comparative display panel shown, the light-emitting side of the light-emitting layer of the first comparative display panel is provided with an organic cover layer and a high-refractive-index filler material filling the openings in the organic cover layer. The openings in the organic cover layer are arranged corresponding to the light-emitting units, and the angle between the sidewalls and the bottom of the openings is 75°. The organic cover layer is a conventional OC layer with a refractive index of approximately 1.51; the filler material is a high-refractive-index adhesive with a refractive index greater than 1.6.

[0086] Example 1 provides a Figure 2 The display panel shown is denoted as Panel 1-R. The light-emitting side of the light-emitting layer of Panel 1-R is provided with the raised structure and the second refractive layer described in the previous embodiment. The raised structure is provided corresponding to the light-emitting unit, and the second refractive layer is filled between the multiple raised structures and completely covers the raised structure. The angle between the sidewall and the bottom of the raised structure is 75°. The material of the raised structure is the same as that of the organic cover layer of the first comparative display panel, and the material of the second refractive layer is selected from a silicone material with a refractive index of 1.4. The other film layer structures of Panel 1-R and the first comparative display panel are the same, and the light-emitting units are all red light-emitting units.

[0087] When the bottom diameter of the opening of the organic covering layer in the first comparative display panel is equal to the diameter of the corresponding pixel opening on the side close to the organic covering layer, and the bottom diameter of the raised structure in panel 1-R is equal to the diameter of the corresponding pixel opening on the side close to the raised structure, the change ratio of the luminous efficiency of panel 1-R relative to the luminous efficiency of the first comparative display panel (i.e., the relative change ratio of the luminous efficiency) is -2.5%, as shown in Table 1.

[0088] It should be noted that the relative change ratio of the luminous efficiency of the panel 1 -R=(luminous efficiency of the panel 1 -R−luminous efficiency of the first comparative display panel) / luminous efficiency of the first comparative display panel·100%.

[0089] When the bottom diameter of the opening of the organic covering layer in the first comparative display panel is 1 micron larger than the diameter of the corresponding pixel opening on the side close to the organic covering layer, and the bottom diameter of the protrusion structure in panel 1-R is 1 micron larger than the diameter of the corresponding pixel opening on the side close to the protrusion structure, the change ratio of the luminous efficiency of panel 1-R relative to the luminous efficiency of the first comparative display panel (i.e., the relative change ratio of the luminous efficiency) is -2.7%, as shown in Table 1.

[0090] It should be noted that in Table 1, CD0 is used to indicate that the bottom diameter of the opening of the organic cover layer in the display panel provided in the comparative example is equal to the diameter of the corresponding pixel opening on the side close to the organic cover layer, and the bottom diameter of the raised structure in the display panel provided in the embodiment is equal to the diameter of the corresponding pixel opening on the side close to the raised structure; CD1 is used to indicate that the bottom diameter of the opening of the organic cover layer in the display panel provided in the comparative example is 1 micron larger than the diameter of the corresponding pixel opening on the side close to the organic cover layer, and the bottom diameter of the raised structure in the display panel provided in the embodiment is 1 micron larger than the diameter of the corresponding pixel opening on the side close to the raised structure.

[0091] Comparative Example 2 and Example 2

[0092] The second comparative display panel provided in Comparative Example 2 differs from the first comparative display panel provided in Comparative Example 1 in that the light-emitting units are green; otherwise, the structures are identical. Panel 2-G provided in Example 2 differs from panel 1-R provided in Example 1 in that the light-emitting units are green; otherwise, the structures are identical. The ratio of the luminous efficiency of panel 2-G relative to the luminous efficiency of the second comparative display panel is shown in Table 1.

[0093] Comparative Example 3 and Example 3

[0094] The third comparative display panel provided in Comparative Example 3 differs from the first comparative display panel provided in Comparative Example 1 in that the light-emitting units are blue; otherwise, the structures are identical. Panel 3-B provided in Example 3 differs from Panel 1-R provided in Example 1 in that the light-emitting units are blue; otherwise, the structures are identical. The ratio of the luminous efficiency of Panel 3-B to that of the third comparative display panel is shown in Table 1.

[0095] Comparative Example 4 and Example 4

[0096] The fourth comparative display panel provided in Comparative Example 4 has the same structure as the first comparative display panel provided in Comparative Example 1. Panel 4-R provided in Example 4 differs from Panel 1-R provided in Example 1 in that the angle between the sidewall and bottom of the raised structure is 105°; all other structures are identical. The ratio of the luminous efficiency of Panel 4-R to that of the fourth comparative display panel is shown in Table 1.

[0097] Comparative Example 5 and Example 5

[0098] The fifth comparative display panel provided in Comparative Example 5 has the same structure as the second comparative display panel provided in Comparative Example 2. Panel 5-G provided in Example 5 differs from panel 4-R provided in Example 4 in that it uses a green light-emitting unit; otherwise, the structures are identical. The ratio of the luminous efficiency of panel 5-G to that of the fifth comparative display panel is shown in Table 1.

[0099] Comparative Example 6 and Example 6

[0100] The sixth comparative display panel provided in Comparative Example 6 has the same structure as the third comparative display panel provided in Comparative Example 3. Panel 6-B provided in Example 6 differs from panel 4-R provided in Example 4 in that the light-emitting units are blue; otherwise, the structures are identical. The ratio of the luminous efficiency of panel 6-B to that of the sixth comparative display panel is shown in Table 1.

[0101] Table 1

[0102]

[0103] It can be seen from Table 1 that the luminous efficiency of panel 4-R and panel 5-G at CD0 is effectively improved, which shows that when the light-emitting side of the light-emitting layer of the display panel is provided with a raised structure and a second refractive layer to be protected by this application, the material of the raised structure is an OC material with a refractive index of approximately 1.51, and the material of the second refractive layer is a silicone material with a refractive index of 1.4. The angle between the side wall and the bottom of the raised structure is 105°, and the bottom diameter of the raised structure is equal to the opening diameter of the corresponding pixel opening close to the side of the raised structure, the luminous efficiency can be effectively improved.

[0104] In the embodiment of the present application, the raised structures 6 of the first refractive layer 3 are arranged corresponding to the light-emitting units 5 of the light-emitting layer 2. The second refractive layer 4 is located on the side of the first refractive layer 3 facing away from the light-emitting layer 2 and covers at least the sidewalls 8 of the raised structures 6. Because the refractive index of the first refractive layer 3 is greater than that of the second refractive layer 4, and the angle θ between the sidewalls 8 and the bottom 7 of the raised structures 6 is greater than or equal to 90°, light emitted from the light-emitting units 5 at a wide viewing angle can undergo total internal reflection when incident on the sidewalls 8 via the bottom 7 of the raised structures 6. This allows the light to be reflected in the normal viewing direction, thereby improving light extraction efficiency in the normal viewing direction and reducing power consumption of the display panel 1. Furthermore, because the refractive index of the first refractive layer 3 is less than 1.55, both the first refractive layer 3 and the second refractive layer 4 are low-refractive-index materials. Therefore, the first refractive layer 3 can be made of existing organic coating materials, while the second refractive layer 4 can be made of silicone-based materials, eliminating the need for additional high-refractive-index materials, thereby reducing material costs. In addition, since low-refractive-index adhesives have higher viscosity and better high-temperature stability than high-refractive-index adhesives, when the second refractive layer 4 is made of adhesive, the second refractive layer 4 can simultaneously meet the requirements of refractive index, viscosity and high-temperature stability.

[0105] Therefore, the first refractive layer 3 and the second refractive layer 4 provided in the embodiment of the present application cooperate with each other to improve the luminous efficiency of the display panel 1 and reduce product power consumption, while reducing material costs and taking into account the material's refractive index, viscosity, high-temperature stability and other properties.

[0106] like Figure 3 As shown, the embodiment of the present application further provides a display device 16 , which includes the display panel 1 described in the above embodiment.

[0107] In some embodiments, the display device 16 further includes a protective layer 17 located on the light-emitting side of the display panel 1 . The protective layer 17 includes but is not limited to a glass cover plate or an ultra-thin glass cover plate.

[0108] In the embodiment of the present application, since the light extraction efficiency of the display panel 1 is improved and the power consumption of the product is reduced, the display effect of the display device 16 is improved and the power consumption of the display device 16 is reduced.

[0109] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0110] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0111] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0112] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A display panel, characterized in that: include: a light-emitting layer comprising a plurality of light-emitting units; a first refractive layer, located on the light-emitting side of the light-emitting layer, and comprising a plurality of protruding structures corresponding to the plurality of light-emitting units; The protruding structure includes a bottom portion close to one side of the light emitting unit and a side wall connected to the bottom portion; a second refractive layer, located on a side of the first refractive layer away from the light-emitting layer; The second refractive layer at least covers the sidewall of the protruding structure, the angle between the sidewall and the bottom is greater than or equal to 90°, and the refractive index of the second refractive layer is less than that of the first refractive layer.

2. The display panel according to claim 1, wherein: The refractive index of the first refractive layer is less than or equal to 1.

55.

3. The display panel according to claim 2, wherein: The difference in refractive index between the first refractive layer and the second refractive layer is greater than or equal to 0.

05.

4. The display panel according to claim 3, wherein: The refractive index of the first refractive layer is greater than or equal to 1.45 and less than or equal to 1.55; the refractive index of the second refractive layer is less than or equal to 1.

45.

5. The display panel according to any one of claims 1 to 4, characterized in that: An included angle between the side wall and the bottom is less than or equal to 120°.

6. The display panel according to claim 5, wherein: An included angle between the side wall and the bottom is greater than or equal to 95° and less than or equal to 115°.

7. The display panel according to any one of claims 1 to 4, characterized in that: The projection of the protruding structure in the thickness direction of the display panel completely covers the projection of the corresponding light emitting unit in the thickness direction of the display panel.

8. The display panel according to claim 7, wherein: The light-emitting layer further includes a pixel definition layer; the pixel definition layer is provided with a plurality of pixel openings corresponding to the plurality of light-emitting units, and the light-emitting units are arranged in the corresponding pixel openings; The diameter of the bottom of the protruding structure is greater than or equal to the diameter of the corresponding pixel opening on a side close to the first refractive layer.

9. The display panel according to claim 8, wherein: A difference between a diameter of the bottom of the protrusion structure and a diameter of the corresponding pixel opening on a side close to the first refractive layer is greater than or equal to 0 and less than or equal to 5 micrometers.

10. The display panel according to any one of claims 1 to 4, characterized in that: The side of the second refractive layer facing away from the first refractive layer is flat; and along the thickness direction of the display panel, the thickness of the convex structure is 10% to 20% of the maximum thickness of the second refractive layer.

11. The display panel according to claim 10, wherein: The thickness of the protruding structure along the thickness direction of the display panel is greater than or equal to 2 micrometers and less than or equal to 4 micrometers.

12. The display panel according to any one of claims 1 to 4, characterized in that: The material of the first refractive layer is selected from at least one of epoxy resin, acrylic resin and polymethacrylate; The material of the second refractive layer is selected from at least one of silicone, acrylic resin, polymethacrylate and thermoplastic polyurethane.

13. The display panel according to claim 12, wherein: The peeling force between the second refractive layer and the adjacent film layer is greater than or equal to 500 grams-force.

14. The display panel according to claim 1, wherein The display panel further includes a polarizer. The polarizer is located on a side of the second refractive layer away from the first refractive layer, and the second refractive layer is in direct contact with the polarizer.

15. The display panel according to claim 1, wherein The display panel further includes an encapsulation layer and a touch layer sequentially arranged on the light-emitting side of the light-emitting layer. The first refractive layer and the second refractive layer are located on a side of the touch layer away from the light-emitting layer.

16. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 15.

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