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CN-119584775-B - Display panel and display device

CN119584775BCN 119584775 BCN119584775 BCN 119584775BCN-119584775-B

Abstract

The application provides a display panel and a display device, wherein the display panel comprises a substrate, a display functional layer and a light extraction layer, wherein the display functional layer is arranged on one side of the substrate, the light extraction layer is arranged on one side of the display functional layer away from the substrate, the light extraction layer comprises a first light extraction layer, a second light extraction layer and a third light extraction layer which are sequentially stacked along the direction away from the substrate, and the refractive index of the second light extraction layer is larger than that of the first light extraction layer and that of the third light extraction layer. According to the display panel provided by the application, the higher refractive index of the second light extraction layer is beneficial to improving the microcavity effect and improving the light extraction efficiency, the lower refractive index of the first light extraction layer and the third light extraction layer is beneficial to reducing the refractive index difference between the first light extraction layer and other film layers, the total reflection phenomenon caused by the mismatching of the refractive indexes is avoided, and the light extraction efficiency and the power consumption benefit are improved, so that the performance of the display panel is improved.

Inventors

  • LIU SHAOHUI
  • LOU ZHENHUA
  • DAI KANG
  • LI ZHENZHEN
  • WANG YAN
  • Yu Zhonglong
  • LIU XIAOJING

Assignees

  • 合肥维信诺科技有限公司

Dates

Publication Date
20260508
Application Date
20250120

Claims (20)

  1. 1. A display panel, comprising: a substrate; the display functional layer is arranged on one side of the substrate; The light extraction layer is positioned on one side of the display functional layer, far away from the substrate, and comprises a first light extraction layer, a second light extraction layer and a third light extraction layer which are sequentially stacked along the direction far away from the substrate; wherein the refractive index of the second light extraction layer is greater than the refractive index of the first light extraction layer and the refractive index of the third light extraction layer; The display function layer comprises a plurality of light emitting devices and a pixel definition layer, the pixel definition layer defines a plurality of pixel openings, the light emitting devices are at least partially positioned in the corresponding pixel openings, and the light emitting devices comprise a first electrode, a light emitting function layer and a second electrode which are sequentially stacked along the direction far away from the substrate; The display panel further comprises a filter layer, wherein the filter layer is arranged on one side, far away from the substrate, of the display functional layer, the light-emitting functional layer comprises a red light-emitting functional layer, a green light-emitting functional layer and a blue light-emitting functional layer, the filter layer comprises a red light filter, a blue light filter and a green light filter, the red light filter is arranged opposite to the red light-emitting functional layer, the green light filter is arranged opposite to the green light-emitting functional layer, the blue light filter is arranged opposite to the blue light-emitting functional layer, and the light transmittance of the blue light filter to blue light is more than or equal to 65%; The display panel further comprises a shading layer, the shading layer is arranged on one side, far away from the substrate, of the light-emitting functional layer, the shading layer comprises a plurality of light-transmitting openings, the light-transmitting openings comprise red light-transmitting openings, green light-transmitting openings and blue light-transmitting openings, the red light filter is at least partially positioned in the corresponding red light-transmitting openings, the green light filter is at least partially positioned in the corresponding green light-transmitting openings, and the blue light filter is at least partially positioned in the corresponding blue light-transmitting openings; The edge of the orthographic projection of the red light luminous functional layer on the substrate and the edge of the orthographic projection of the corresponding red light transparent opening on the substrate have a first distance, the edge of the orthographic projection of the green light luminous functional layer on the substrate and the edge of the orthographic projection of the corresponding green light transparent opening on the substrate have a second distance, and the edge of the orthographic projection of the blue light luminous functional layer on the substrate and the edge of the orthographic projection of the corresponding blue light transparent opening on the substrate have a third distance, wherein the third distance is smaller than the first distance and the second distance.
  2. 2. The display panel according to claim 1, wherein a refractive index of the second light extraction layer is 1.5 or more.
  3. 3. The display panel according to claim 1, wherein a refractive index of the second light extraction layer is 2 or more and 2.2 or less.
  4. 4. The display panel according to claim 1, wherein a refractive index of the first light extraction layer and a refractive index of the third light extraction layer are less than or equal to 1.5.
  5. 5. The display panel according to claim 1, wherein a refractive index of the first light extraction layer and a refractive index of the third light extraction layer are less than or equal to 1.45.
  6. 6. The display panel according to claim 1, wherein a refractive index of the first light extraction layer and a refractive index of the third light extraction layer are equal.
  7. 7. The display panel according to claim 1, further comprising a buffer layer provided on a side of the light extraction layer remote from the display function layer.
  8. 8. The display panel according to claim 7, wherein a material of the buffer layer includes lithium fluoride or potassium fluoride.
  9. 9. The display panel according to claim 7, wherein a refractive index of the buffer layer is smaller than a refractive index of the third light extraction layer.
  10. 10. The display panel according to claim 7, wherein a difference between a refractive index of the buffer layer and a refractive index of the third light extraction layer is less than or equal to 0.3.
  11. 11. The display panel according to claim 7, wherein a difference between a refractive index of the buffer layer and a refractive index of the third light extraction layer is less than or equal to 0.15.
  12. 12. The display panel of claim 7, wherein the buffer layer has a refractive index greater than or equal to 1.2 and less than or equal to 1.4.
  13. 13. The display panel according to claim 1, wherein a thickness of the light extraction layer is less than or equal to 90nm.
  14. 14. The display panel of claim 1, wherein a thickness of the second light extraction layer is greater than a thickness of the first light extraction layer and a thickness of the third light extraction layer.
  15. 15. The display panel according to claim 1, wherein a thickness of the first light extraction layer and a thickness of the third light extraction layer are equal.
  16. 16. The display panel according to claim 1, wherein a thickness of the second light extraction layer is greater than or equal to 50nm and less than or equal to 70nm.
  17. 17. The display panel according to claim 1, wherein a thickness of the first light extraction layer and a thickness of the third light extraction layer are greater than or equal to 10nm and less than or equal to 20nm.
  18. 18. The display panel of claim 1, wherein the blue filter has a transmittance of blue light of greater than or equal to 75%.
  19. 19. The display panel of claim 1, wherein the blue filter has a thickness of less than or equal to 5 μιη.
  20. 20. The display panel of claim 1, wherein the orthographic projection of the red light emitting functional layer on the substrate is located within the orthographic projection of the corresponding red light filter on the substrate.

Description

Display panel and display device Technical Field The present application relates to the field of display technologies, and in particular, to a display panel and a display device. Background An OLED (Organic Light-Emitting Diode) is an active Light-Emitting device of a sandwich structure composed of a plurality of Organic layers and two side electrodes, and is an active Light-Emitting device of a sandwich structure composed of a plurality of Organic layers and two side electrodes. Currently, active-Matrix Organic Light-Emitting Diode (AMOLED) -based display screens have been commercialized in the fields of smart phones, watches, notebook computers, and the like. However, the existing display screen has the problem of low light extraction efficiency. Disclosure of Invention Therefore, the present application is directed to a display panel, which is beneficial to improving light-emitting efficiency and power consumption. In view of the above object, the present application provides a display panel including: a substrate; the display functional layer is arranged on one side of the substrate; The light extraction layer is positioned on one side of the display functional layer, far away from the substrate, and comprises a first light extraction layer, a second light extraction layer and a third light extraction layer which are sequentially stacked along the direction far away from the substrate; Wherein the refractive index of the second light extraction layer is greater than the refractive index of the first light extraction layer and the refractive index of the third light extraction layer. In one embodiment, the refractive index of the second light extraction layer is greater than or equal to 1.5; Preferably, the refractive index of the second light extraction layer is greater than or equal to 2 and less than or equal to 2.2; Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are less than or equal to 1.5; Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are less than or equal to 1.45; Preferably, the refractive index of the first light extraction layer and the refractive index of the third light extraction layer are equal. In one embodiment, the display panel further includes a buffer layer disposed at a side of the light extraction layer away from the display function layer; Preferably, the material of the buffer layer includes lithium fluoride or potassium fluoride; Preferably, the refractive index of the buffer layer is smaller than the refractive index of the third light extraction layer; preferably, the difference between the refractive index of the buffer layer and the refractive index of the third light extraction layer is less than or equal to 0.3; preferably, the difference between the refractive index of the buffer layer and the refractive index of the third light extraction layer is less than or equal to 0.15; preferably, the refractive index of the buffer layer is greater than or equal to 1.2 and less than or equal to 1.4; Preferably, the refractive index of the buffer layer is equal to 1.3. In one embodiment, the thickness of the light extraction layer is less than or equal to 90nm; Preferably, the thickness of the second light extraction layer is greater than the thickness of the first light extraction layer and the thickness of the third light extraction layer; Preferably, the thickness of the first light extraction layer and the thickness of the third light extraction layer are equal; Preferably, the thickness of the second light extraction layer is greater than or equal to 50nm and less than or equal to 70nm; preferably, the thickness of the first light extraction layer and the thickness of the third light extraction layer are greater than or equal to 10nm and less than or equal to 20nm; Preferably, the thickness of the second light extraction layer is 60nm, and the thickness of the first light extraction layer and the thickness of the third light extraction layer are 15nm. In one embodiment, the display function layer includes a plurality of light emitting devices and a pixel definition layer, the pixel definition layer defines a plurality of pixel openings, the light emitting devices are at least partially located in the corresponding pixel openings, and the light emitting devices include a first electrode, a light emitting function layer, and a second electrode which are sequentially stacked along a direction away from the substrate. In one embodiment, the display panel further includes a filter layer, where the filter layer is disposed on a side of the display functional layer away from the substrate; Preferably, the light-emitting functional layer comprises a red light-emitting functional layer, a green light-emitting functional layer and a blue light-emitting functional layer, wherein the filter layer comprises a red light filter