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KR-20260065029-A - DISPLAY DEVICE, ELECTRONIC DEVICE AND METHOD FOR MANUFACTURING A DISPLAY DEVICE

KR20260065029AKR 20260065029 AKR20260065029 AKR 20260065029AKR-20260065029-A

Abstract

A display device comprises a substrate, a circuit layer disposed on the substrate, a first electrode disposed on the circuit layer, a light-emitting layer disposed on the first electrode, an electronic functional layer disposed on the light-emitting layer, a second electrode disposed on the electronic functional layer and having an integral shape, and a stabilizing layer covering the second electrode. The second electrode comprises first to third portions. The first portion is adjacent to the electronic functional layer, the second portion is adjacent to the stabilizing layer, and the third portion is disposed between the first portion and the second portion. The third portion has a relatively larger density than the second portion. At least a portion of the upper surface of the second electrode has an uneven structure. The upper surface of the second electrode has a root mean square roughness value of 2.0 nm or more and 6.0 nm or less.

Inventors

  • 김휘
  • 손지희
  • 이슬기
  • 이준구

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260508
Application Date
20241031

Claims (20)

  1. Substrate; A circuit layer disposed on the above substrate; A first electrode disposed on the circuit layer above; A light-emitting layer disposed on the first electrode; An electronic functional layer disposed on the above-mentioned light-emitting layer; A second electrode disposed on the electronic functional layer and having an integral shape; and It includes a stabilizing layer covering the second electrode, and The second electrode above includes first to third parts, and The above first part is adjacent to the electronic functional layer, and The above second part is adjacent to the above stabilization layer, and The third part is positioned between the first part and the second part, and The third part above has a relatively larger density than the second part, and A display device having at least a portion of the upper surface of the second electrode having an uneven structure.
  2. In Article 1, A display device having a root-mean-square roughness value of 2.5 nm or more and 6.0 nm or less on the upper surface of the second electrode.
  3. In Article 1, The first part above has a relatively smaller density than the third part, and A display device having at least a portion of the lower surface of the second electrode having an uneven structure.
  4. In Paragraph 3, A display device having a root-mean-square roughness value of 2.5 nm or more and 6.0 nm or less on the lower surface of the second electrode.
  5. In Article 1, The first part, the second part, and the third part are a display device provided with pure silver (pure Ag).
  6. In Article 1, The above-mentioned stable layer is a display device comprising a metal or a metal oxide.
  7. In Article 6, The above-mentioned stabilization layer is a display device containing ytterbium (Yb).
  8. In Article 1, The above electronic functional layer includes at least one electron injection layer, and The above electron injection layer is a display device containing ytterbium (Yb).
  9. In Article 8, A display device having a thickness of the electron injection layer of 5 Å or more and 30 Å or less.
  10. In Article 1, A display device in which the thickness of the second electrode is 50 Å or more and 300 Å or less.
  11. In Article 1, The second electrode above is, A fourth part disposed between the first part and the third part; and It further includes a fifth part positioned between the fourth part and the third part, and The above-mentioned fourth part has a relatively larger density than the above-mentioned first part, and The above-mentioned fifth part is a display device having a relatively smaller density than the above-mentioned third part.
  12. A step of preparing a preliminary display panel by forming a circuit layer, a first electrode, and a light-emitting layer on a substrate; A step of forming an electronic functional layer comprising at least one electron injection layer on the light-emitting layer; A step of forming a second electrode on the electronic functional layer; and The method includes the step of forming a stabilization layer to cover the second electrode, The second electrode comprises a first portion adjacent to the electronic functional layer, a second portion adjacent to the stabilization layer, and a third portion disposed between the first portion and the second portion. The step of forming the second electrode above is, A step of forming the first portion on the electronic functional layer at a first deposition rate; A step of forming the third part on the first part at a third deposition rate greater than the first deposition rate; and The method includes the step of forming the second part on the third part at a second deposition rate lower than the third deposition rate, A method for manufacturing a display device, wherein the step of forming the second portion comprises forming a portion of the upper surface of the second electrode having a root-mean-square roughness value of 2.5 nm or more and 6.0 nm or less.
  13. In Article 12, A method for manufacturing a display device in which the step of forming the first part forms a part of the lower surface of the second electrode having a root-mean-square roughness value of 2.0 nm or more and 6.0 nm or less.
  14. In Article 12, A method for manufacturing a display device in which the first part, the second part, and the third part are formed of pure silver (pure Ag).
  15. In Article 12, A method for manufacturing a display device in which the second electrode is formed by vacuum thermal evaporation.
  16. In Article 12, The step of forming the second electrode is a method for manufacturing a display device formed in a single process within a single chamber.
  17. Substrate; A circuit layer disposed on the above substrate; A first electrode disposed on the circuit layer above; A light-emitting layer disposed on the first electrode; An electronic functional layer disposed on the above-mentioned light-emitting layer; A second electrode disposed on the electronic functional layer and having an integral shape; and It includes a stabilizing layer covering the second electrode, and The second electrode above is, It includes a first portion adjacent to the electronic functional layer and a second portion adjacent to the stabilization layer, and The second part has a relatively large density compared to the first part, and A display device having at least a portion of the lower surface of the second electrode having an uneven structure.
  18. In Article 17, The second electrode further includes a third portion disposed on the second portion, and The third part above has a relatively smaller density compared to the second part, and A display device having at least a portion of the upper surface of the second electrode having an uneven structure.
  19. In Article 18, The upper surface of the second electrode has a root-mean-square roughness value of 2.0 nm or more and 6.0 nm or less, and At least a portion of the lower surface of the second electrode has an uneven structure, The lower surface of the second electrode has a root-mean-square roughness value of 2.0 nm or more and 6.0 nm or less, and The first part, the second part, and the third part are a display device provided with pure silver (pure Ag).
  20. Substrate; A circuit layer disposed on the above substrate; A first electrode disposed on the circuit layer above; A light-emitting layer disposed on the first electrode; An electronic functional layer disposed on the above-mentioned light-emitting layer; A second electrode disposed on the electronic functional layer and having an integral shape; and It includes a stabilizing layer covering the second electrode, and The second electrode above includes first to third parts, and The above first part is adjacent to the electronic functional layer, and The above second part is adjacent to the above stabilization layer, and The third part is positioned between the first part and the second part, and The third part above has a relatively larger density than the second part, and An electronic device having at least a portion of the upper surface of the second electrode having an uneven structure.

Description

Display device, electronic device, and method for manufacturing a display device The present invention relates to a display device, and specifically to a display device with improved reliability and improved side visibility, and a method for manufacturing the same. Organic light-emitting displays possess self-luminous properties and, unlike liquid crystal display devices, do not require a separate light source, allowing for reduced thickness and weight. Furthermore, organic light-emitting displays exhibit high-quality characteristics such as low power consumption, high brightness, and high response speed. Recently, methods to improve side visibility in organic light-emitting display devices are being researched to achieve high-quality colors regardless of the user's field of view. FIG. 1 is a schematic plan view of a display device according to one embodiment. Figure 2 is a cross-sectional view taken along the line I-I' of Figure 1. FIG. 3 is a cross-sectional view showing a part of a display device according to one embodiment. Figure 4 is a graph showing the color change according to the viewing angle of samples of the display device. FIG. 5 is an enlarged view showing the AA area of FIG. 2 in a display device of one embodiment. FIG. 6 is an enlarged view showing the AA area of FIG. 2 in a display device of one embodiment. FIG. 7 is an enlarged view showing the AA area of FIG. 2 in a display device of one embodiment. FIG. 8 is a flowchart illustrating a method for manufacturing a display device of one embodiment. FIG. 9 is a flowchart showing part of the manufacturing method of a display device of one embodiment. FIGS. 10a to 10f are cross-sectional views schematically illustrating the steps of a method for manufacturing a display device according to one embodiment. FIG. 11 is a drawing illustrating electronic devices to which a display device according to an embodiment of the present invention is applied. FIG. 12 is a drawing illustrating electronic devices to which a display device according to an embodiment of the present invention is applied. In this specification, where a component (or region, layer, part, etc.) is described as being “on,” “connected,” or “joined” another component, it means that it may be directly placed/connected/joined on the other component, or that a third component may be placed between them. Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the effective illustration of the technical content. “And/or” includes all one or more combinations that the associated components may define. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise. Additionally, terms such as “below,” “lower,” “above,” and “upper” are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings. Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an overly ideal or overly formal sense unless explicitly defined herein. Where any embodiment in this specification can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the order described. First to third directions (DR1, DR2, DR3) may be defined. The first direction (DR1) and the second direction (DR2) may be directions that intersect each other, defined on the plane of the display device (DD) shown in FIG. 1. The third direction (DR3) may be the thickness direction of the display device (DD) defined in FIG. 2. FIG. 1 is a schematic plan view of a display de