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CN-117560947-B - Display panel, preparation method thereof and display device

CN117560947BCN 117560947 BCN117560947 BCN 117560947BCN-117560947-B

Abstract

The application provides a display panel, a preparation method thereof and a display device, wherein the display panel comprises a substrate; the pixel definition layer is arranged on the light-emitting side of the substrate, the pixel definition layer defines a plurality of pixel areas for setting sub-pixels, the light-emitting functional layer is arranged on one side, far away from the substrate, of the pixel definition layer, the light-emitting functional layer comprises a carrier layer which continuously covers the pixel definition layer and the pixel areas, the carrier layer comprises a first area and a second area except the first area, orthographic projection of the first area on the pixel definition layer is positioned in the pixel definition layer, and carrier mobility of the first area is smaller than that of the second area. According to the display panel, the preparation method thereof and the display device provided by the application, when carriers migrate from one of the second areas of the carrier layer to the adjacent second area, the first area can block the migration of the carriers, so that crosstalk current is prevented from being formed between adjacent sub-pixels of the display panel.

Inventors

  • LIU XIAOYUN
  • JIAO ZHIQIANG
  • ZHANG DACHENG
  • ZHANG YONGFENG

Assignees

  • 京东方科技集团股份有限公司
  • 北京京东方技术开发有限公司

Dates

Publication Date
20260512
Application Date
20231226

Claims (20)

  1. 1. A display panel, comprising: A substrate base; The pixel definition layer is arranged on the light emergent side of the substrate base plate and defines a plurality of pixel areas for arranging sub-pixels; the light-emitting functional layer is arranged on one side, far away from the substrate, of the pixel definition layer, and comprises a carrier layer which continuously covers the pixel definition layer and the pixel areas, wherein the carrier layer comprises a first area and a second area except the first area, the orthographic projection of the first area on the pixel definition layer is positioned in the pixel definition layer, and the carrier mobility of the first area is smaller than that of the second area; The display panel further includes: The packaging layer is arranged on one side, far away from the substrate, of the light-emitting functional layer, a first thinning groove is formed in the surface, far away from the substrate, of the packaging layer, and orthographic projection of the first thinning groove on the carrier layer coincides with the first area.
  2. 2. The display panel according to claim 1, wherein the first region is made of a first material which is a material formed by doping or light irradiation modifying a material for forming the second region.
  3. 3. The display panel of claim 1, wherein the carrier layer comprises at least one of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and a charge generation layer.
  4. 4. The display panel of claim 1, wherein a minimum distance between a bottom of the first thinning groove and a surface of the encapsulation layer facing the light emitting functional layer is greater than 1000 angstroms.
  5. 5. The display panel of claim 1, wherein the display panel further comprises: and the etching barrier layer is arranged on one side of the light-emitting functional layer, which is far away from the substrate base plate.
  6. 6. The display panel of claim 5, wherein the encapsulation layer comprises a plurality of structural layers disposed in a stack, one of the plurality of structural layers being the etch stop layer.
  7. 7. The display panel of claim 6, wherein the encapsulation layer comprises two silicon nitride layers disposed on opposite sides of the etch stop layer.
  8. 8. The display panel of claim 7, wherein the encapsulation layer further comprises a silicon oxide layer disposed on a side of the silicon nitride layer remote from the etch stop layer.
  9. 9. The display panel of claim 5, wherein the etch stop layer is an aluminum oxide layer.
  10. 10. The display panel according to claim 1, the display panel is characterized in that the display panel further comprises: The anode layer is arranged between the pixel definition layer and the substrate base plate, the anode layer comprises a plurality of anodes which correspond to the pixel areas and are arranged at intervals, and the orthographic projection of each pixel area in the plurality of pixel areas on the anode layer at least partially overlaps with the corresponding anode; The pixel defining layer includes a first bump structure disposed between two adjacent anodes, the first bump structure covering an edge of the anode.
  11. 11. The display panel of claim 10, further comprising an encapsulation layer, the encapsulation layer being provided with a first thinning groove; The cross section shape of the first bulge structure is polygonal, the orthographic projection of the first thinning groove on the first bulge structure is positioned in the top plane of the polygon, and the cross section width of the first thinning groove is smaller than the top width of the polygon.
  12. 12. The display panel of claim 10, wherein the material of the pixel defining layer is an inorganic material, the slope angle of the first bump structure is greater than 45 °, and the distance between the top of the first bump structure and the surface of the anode layer facing the pixel defining layer is less than or equal to 1000 angstroms.
  13. 13. The display panel of claim 10, wherein the material of the pixel defining layer is an organic material, the slope angle of the first bump structure is less than 45 °, and the distance between the top of the first bump structure and the surface of the anode layer facing the pixel defining layer is greater than 1000 angstroms.
  14. 14. The display panel according to claim 10, wherein second bump structures are provided along a width direction of the first bump structures at both side edges of a top of the first bump structures, a second thinning groove is formed between two adjacent second bump structures, and a thickness of a light emitting functional layer located in the second thinning groove is smaller than a thickness of a light emitting functional layer located outside the second thinning groove.
  15. 15. The display panel of claim 14, further comprising an encapsulation layer, the encapsulation layer being provided with a first thinning groove; the orthographic projection of the second thinning groove on the packaging layer is positioned in the first thinning groove.
  16. 16. The display panel of claim 14, wherein a slope angle of a sidewall of the second bump structure toward the pixel region is smaller than a slope angle of a sidewall of the second bump structure toward the second thinning groove.
  17. 17. The display panel of claim 14, wherein a cross-sectional width of the second thinning groove is smaller than a gap width between adjacent two anodes.
  18. 18. The display panel according to claim 1, wherein the light-emitting functional layer is an organic light-emitting functional layer or an inorganic light-emitting functional layer.
  19. 19. A display device comprising a display panel as claimed in any one of claims 1 to 18.
  20. 20. A method for manufacturing a display panel according to any one of claims 1 to 18, comprising: forming a pixel definition layer on the light emergent side of the provided substrate, wherein the pixel definition layer defines a plurality of pixel areas; Forming a light emitting function layer on a side of the pixel defining layer away from the substrate, wherein the light emitting function layer comprises a carrier layer continuously covering the pixel defining layer and the plurality of pixel areas; Dividing the carrier layer into a first region to be processed and a second region except the first region to be processed, wherein orthographic projection of the first region to be processed in the pixel definition layer is positioned in the pixel definition layer; And carrying out modification treatment on the first region to be treated of the carrier layer to form a first region, wherein the carrier mobility of the first region is smaller than that of the second region.

Description

Display panel, preparation method thereof and display device Technical Field The application relates to the technical field of display, in particular to a display panel, a preparation method thereof and a display device. Background With the continuous development of display technology, the LED display device can not only meet the display requirement of small size, but also be applied in the fields of high resolution (PPI) and large size display. The LED display device may be implemented as a television, video player, personal Computer (PC), home theater, smart phone, virtual reality device (AR/VR), etc. Meanwhile, the LED display device has a wide development prospect due to excellent display characteristics such as high resolution, high brightness, rich colors, low driving voltage, fast response speed, low power consumption, and the like. Disclosure of Invention In view of the above, the present application provides a display panel, a method for manufacturing the same, and a display device. The display panel comprises a substrate, a pixel definition layer, a light emitting functional layer and a carrier layer, wherein the pixel definition layer is arranged on the light emitting side of the substrate and defines a plurality of pixel areas used for arranging sub-pixels, the light emitting functional layer is arranged on the side, far away from the substrate, of the pixel definition layer and comprises a first area and a second area except the first area, the carrier layer continuously covers the pixel definition layer and the plurality of pixel areas, the orthographic projection of the first area on the pixel definition layer is positioned in the pixel definition layer, and the carrier mobility of the first area is smaller than the carrier mobility of the second area. Optionally, the first region is made of a first material, and the first material is formed by doping or modifying a material used for forming the second region by light irradiation. Optionally, the carrier layer includes at least one of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and a charge generation layer. Optionally, the display panel further comprises a packaging layer, the packaging layer is arranged on one side, far away from the substrate, of the light-emitting functional layer, a first thinning groove is formed in the surface, far away from the substrate, of the packaging layer, and orthographic projection of the first thinning groove on the carrier layer coincides with the first area. Optionally, a minimum distance between a bottom of the first thinning groove and a surface of the encapsulation layer facing the light emitting function layer is greater than 1000 angstroms. Optionally, the display panel further comprises an etching barrier layer, wherein the etching barrier layer is arranged on one side of the light-emitting functional layer, which is far away from the substrate base plate. Optionally, the encapsulation layer includes a plurality of structural layers stacked, and one of the plurality of structural layers is the etching barrier layer. Optionally, the packaging layer includes two silicon nitride layers respectively disposed on two sides of the etching barrier layer. Optionally, the packaging layer further includes a silicon oxide layer disposed on a side of the silicon nitride layer away from the etching barrier layer. Optionally, the etching barrier layer is an alumina layer. Optionally, the display panel further comprises an anode layer, wherein the anode layer is arranged between the pixel definition layer and the substrate base plate, the anode layer comprises a plurality of anodes which are corresponding to the pixel areas and are arranged at intervals, the orthographic projection of each of the pixel areas on the anode layer at least partially overlaps with the corresponding anode, the pixel definition layer comprises a first bulge structure arranged between two adjacent anodes, and the first bulge structure covers the edge of the anode. Optionally, the display panel further comprises an encapsulation layer, wherein the encapsulation layer is provided with a first thinning groove, the cross section of the first protruding structure is polygonal, and the cross section width of the first thinning groove is smaller than the top width of the polygon. Optionally, the material of the pixel defining layer is an inorganic material, the slope angle of the first protruding structure is greater than 45 °, and a distance between the top of the first protruding structure and a surface of the anode layer facing the pixel defining layer is less than or equal to 1000 angstroms. Optionally, the material of the pixel defining layer is an organic material, the slope angle of the first protruding structure is smaller than 45 °, and the distance between the top of the first protruding structure and the surface of the anode layer facing the pixel defining layer is larger than