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JP-2026514315-A - Display panel

JP2026514315AJP 2026514315 AJP2026514315 AJP 2026514315AJP-2026514315-A

Abstract

This disclosure provides a display panel and a display device, the display panel comprising a substrate, an isolation structure located on the substrate, a first sealing layer, and a plurality of light-emitting units. The isolation structure has a plurality of isolation openings defining each of the light-emitting units, and the first sealing layer covers the isolation openings and the light-emitting units. The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate to the side away from the substrate. This solution can improve the flatness of the etched surface of the first sealing layer, thereby more effectively protecting the first sealing layer in the manufacturing process of the display panel.

Inventors

  • 徐莉萍
  • 林政毅
  • 蘇伯昆
  • 項曄
  • 付雨▲ティン▼
  • 朱修劍

Assignees

  • 合肥維信諾科技有限公司
  • 維信諾科技股▲ふん▼有限公司

Dates

Publication Date
20260511
Application Date
20240902
Priority Date
20240327

Claims (20)

  1. It is a display panel, circuit board and A plurality of light-emitting units located on the substrate, An isolation structure located on the substrate and having a plurality of isolation openings that define each of the light-emitting units, The isolation opening and the first sealing layer covering the light-emitting unit are included, The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate toward the side away from the substrate. Display panel.
  2. The first sealing layer includes a plurality of sealing units, each corresponding to one of the light-emitting units. The preceding first sealing layer is an inorganic layer. The display panel according to claim 1.
  3. The sealing unit includes a first main surface facing the substrate and/or the isolation structure, a second main surface facing away from the substrate and/or the isolation structure, and a side surface connecting the first main surface and the second main surface, wherein the first side surface of the sealing unit is a smooth surface. The display panel according to claim 2.
  4. The first side surface of the sealing unit is flat, and the surface on which the first side surface of the sealing unit is located intersects with and is not perpendicular to the surface on which the substrate is located. The display panel according to claim 3.
  5. The display panel further includes a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defines a plurality of pixel apertures, the pixel apertures are provided corresponding to the isolation apertures, the orthographic projection of the pixel apertures on the substrate lies inside the orthographic projection of the corresponding isolation apertures, and the pixel definition layer is an inorganic layer. The display panel according to any one of claims 1 to 4.
  6. The density of the pixel definition layer gradually decreases from the side of the pixel definition layer facing the substrate toward the side away from the substrate, the second side surface of the pixel definition layer is planar, and the surface on which the second side surface of the pixel definition layer is located intersects with and is not perpendicular to the surface on which the substrate is located. The display panel according to claim 5.
  7. The isolation structure includes a support portion and a crown portion located on the side of the support portion that is facing away from the substrate, wherein the orthographic projection of the support portion on the substrate is located inside the orthographic projection of the crown portion. In the substrate, the orthographic edge of the crown portion is the orthographic edge of the isolation structure. The display panel according to any one of claims 1 to 4.
  8. The light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked on the substrate. The light-emitting functional layer and the second electrode of each of the light-emitting units are located within the corresponding isolation openings, the support is a conductive structure, and the second electrode of the light-emitting unit is electrically connected to the support. The display panel according to claim 7.
  9. The display panel further includes a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defines a plurality of pixel apertures, and the pixel apertures are arranged corresponding to the isolation apertures. The isolation structure further includes an auxiliary support portion located between the support portion and the pixel definition layer, In the substrate, the orthographic projection of the auxiliary support portion is located inside the orthographic projection of the crown portion, the orthographic projection of the support portion is located inside the orthographic projection of the auxiliary support portion, the auxiliary support portion is a conductive structure, and the second electrode of the light-emitting unit is electrically connected to the auxiliary support portion. The display panel according to claim 7.
  10. The density of the pixel definition layer gradually decreases from the side of the pixel definition layer facing the substrate toward the side away from the substrate. The display panel according to claim 9.
  11. The sealing unit includes a first main surface facing the substrate and/or the isolation structure, a second main surface facing away from the substrate and/or the isolation structure, and a side surface connecting the first main surface and the second main surface. The side surface includes a plurality of sub-side surfaces that are sequentially connected along the direction from the first main surface to the second main surface, and the plane determined by the boundary between the side surface and the first main surface and the boundary between the side surface and the second main surface has an angle of 45 degrees or less with respect to each of the sub-side surfaces, and in the substrate, the orthographic projection of the second main surface is located inside the orthographic projection of the first main surface. The display panel according to claim 2.
  12. The refractive index of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate toward the side away from the substrate. The display panel according to any one of claims 1 to 11.
  13. The oxygen content of the first sealing layer gradually increases from the side of the first sealing layer facing the substrate toward the side away from the substrate. The display panel according to any one of claims 1 to 11.
  14. It is a display panel, circuit board and A plurality of light-emitting units located on the substrate, An isolation structure located on the substrate and having a plurality of isolation openings that define each of the light-emitting units, A first sealing layer covering the isolation opening and the light-emitting unit, and including a plurality of sealing units corresponding to each of the light-emitting units, The sealing unit includes a first main surface facing the substrate and/or the isolation structure, a second main surface facing away from the substrate and/or the isolation structure, and a side surface connecting the first main surface and the second main surface. The side surface includes a plurality of sub-side surfaces that are sequentially connected along the direction from the first main surface to the second main surface, and the plane determined by the boundary between the side surface and the first main surface and the boundary between the side surface and the second main surface has an angle of 45 degrees or less with respect to each of the sub-side surfaces, and in the substrate, the orthographic projection of the second main surface is located inside the orthographic projection of the first main surface. Display panel.
  15. The sealing unit includes a first main surface facing the substrate and/or the isolation structure, a second main surface facing away from the substrate and/or the isolation structure, and a side surface connecting the first main surface and the second main surface, wherein the first side surface of the sealing unit is planar, and the surface on which the first side surface of the sealing unit is located intersects with and is not perpendicular to the surface on which the substrate is located. The display panel according to claim 14.
  16. The density of the first sealing layer gradually decreases from the side of the first sealing layer facing the substrate toward the side away from the substrate, or The first sealing layer includes at least two sub-sealing layers stacked on top of each other, wherein the refractive index of the sub-sealing layer is greater the smaller the distance from the substrate. The display panel according to claim 14 or 15.
  17. The sealing unit includes a first sub-sealing layer, a second sub-sealing layer, and a third sub-sealing layer stacked on top of each other, wherein the first sub-sealing layer, the second sub-sealing layer, and the third sub-sealing layer are sequentially installed along a direction away from the substrate. The first sub-sealing layer, the second sub-sealing layer, and the third sub-sealing layer gradually decrease in density or gradually decrease in refractive index. The display panel according to claim 16.
  18. It is a display panel, circuit board and The substrate has a plurality of light-emitting units positioned on it, An isolation structure located on the substrate and having a plurality of isolation openings that define each of the light-emitting units, A first sealing layer comprising at least two sub-sealing layers stacked on top of each other, covering the isolation opening and the light-emitting unit, The smaller the distance to the substrate, the greater the refractive index of the sub-sealing layer. Display panel.
  19. The smaller the distance to the substrate, the higher the density of the sub-sealing layer, and/or The smaller the distance to the substrate, the lower the oxygen content of the sub-sealing layer. The display panel according to claim 18.
  20. The light-emitting unit includes a first electrode, a light-emitting functional layer, and a second electrode sequentially stacked on the substrate, and the light-emitting functional layer and the second electrode of each of the light-emitting units are located within the corresponding isolation apertures. The display panel further includes a pixel definition layer located between the substrate and the isolation structure, the pixel definition layer defines a plurality of pixel apertures corresponding to each of the isolation apertures, the orthographic projection of the pixel apertures on the substrate lies within the orthographic projection of the corresponding isolation apertures, the light-emitting functional layer and the second electrode fill the pixel apertures and extend to the surface of the pixel definition layer facing away from the substrate, and the pixel definition layer is an inorganic layer. The pixel definition layer includes at least two sub-definition layers stacked on top of each other, and the smaller the distance from the substrate, the greater the refractive index of the sub-definition layer. The display panel according to claim 18 or 19.

Description

This application claims priority to Chinese Patent Application No. 202410364382.X, filed on March 27, 2024, with the title of the invention "Display Panel and Display Device," and all contents of said application are incorporated herein by reference. This disclosure relates to the technology of displays, and more specifically, to display panels and display devices. Organic light-emitting diodes (OLEDs) are organic thin-film electroluminescent units that have attracted attention and are widely applied in electronic display products due to their advantages such as simple manufacturing processes, low cost, low power consumption, high brightness, wide viewing angles, high contrast, and the ability to enable flexible displays. However, current electronic display products are limited by their own structural design, making it difficult to further enhance the display effectiveness of the display panel. This is a schematic diagram of the planar structure of a display panel according to one embodiment of the present disclosure.This is an enlarged view of area S1 of the display panel shown in Figure 1.Figure 2 is a cross-sectional view taken along line M-N of the display panel.Figure 3 is a magnified view of a portion of the display panel shown.This is an enlarged view of a portion of another display panel according to one embodiment of the present disclosure.This is a cross-sectional view of a display panel according to one embodiment of the present disclosure.This is a cross-sectional view of a display panel according to one embodiment of the present disclosure.(A) to (D) are process diagrams of a manufacturing method for forming the display panel shown in Figure 6, according to one embodiment of the present disclosure.This is a schematic diagram showing the positional relationship between a part of a display panel according to one embodiment of the present disclosure and the deposition source during deposition.This is a cross-sectional view of a portion of a display panel according to one embodiment of the present disclosure. The technical solutions in the embodiments of this specification will be described clearly and completely below, with reference to the drawings in the embodiments herein. Needless to say, these embodiments represent only a selection of the embodiments described herein, not all embodiments. Those skilled in the art will also know that all other embodiments obtained without creative work based on the embodiments described herein are also covered by this specification. In display products, several functional layers in the light-emitting unit are formed by vapor deposition. Each light-emitting unit has multiple functional layers, and the materials of several functional layers (e.g., light-emitting layers) that emit different light differ. Therefore, when vapor-depositing these functional layers using a mask plate (e.g., a fine mask plate), multiple alignment steps are required. To solve the misalignment problem caused by alignment accuracy errors, it is necessary to ensure sufficient space (a safety margin related to alignment errors) between different light-emitting units to guarantee that the actual light-emitting area of the light-emitting unit has a certain degree of overlap with the design position (design area). This is equivalent to compressing the design area of the light-emitting area of the light-emitting unit, which not only limits the light-emitting area of the light-emitting unit but also prevents further increase in the array density of the light-emitting units, making it difficult to further improve the PPI (pixel density) of the display panel. In this disclosure, an isolation structure is installed in the gap between light-emitting units to isolate the functional layers of adjacent light-emitting units. This allows for full-surface deposition on the display panel during the functional layer deposition process, eliminating the need to individually manufacture the functional layers of each light-emitting unit using mask plates. Since this process eliminates the need to consider alignment accuracy issues during deposition, the gap between light-emitting units can be made smaller, increasing the PPI (Picture Per Intake) (the principle can be found in the relevant explanations in the embodiments shown in Figures 8(A) to 8(D) below). Furthermore, when manufacturing light-emitting units using an isolation structure, the units are manufactured in batches according to different light emission colors. Therefore, after the manufacturing of the previous batch of light-emitting units is complete, a sealing structure (the first sealing layer below) is formed on top of them to protect them and reduce damage to the light-emitting units from the previous batch during the manufacturing process for subsequent batches. Correspondingly, the sealing structure is also formed in multiple stages, and the sealing effect of the sealing structure directly affects the manufacturing yield of the light-emitting