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KR-102963338-B1 - Light emitting device and display apparatus including the same

KR102963338B1KR 102963338 B1KR102963338 B1KR 102963338B1KR-102963338-B1

Abstract

A light-emitting element and a display device including the same are disclosed. The disclosed light-emitting element comprises a metal reflective layer having a phase-modulating surface on which rectangular phase-modulating elements are formed, a first electrode provided on the metal reflective layer, an organic light-emitting layer provided on the first electrode and emitting light, and a second electrode provided on the organic light-emitting layer. The rectangular phase-modulating elements are arranged to form a geometric phase lens.

Inventors

  • 이성훈
  • 송석호
  • 주원제

Assignees

  • 삼성전자주식회사
  • 한양대학교 산학협력단

Dates

Publication Date
20260508
Application Date
20200717

Claims (20)

  1. A metal reflective layer comprising a phase modulation surface in which rectangular phase modulation elements are formed; A first electrode provided on the metal reflective layer above; An organic light-emitting layer provided on the first electrode and emitting light; and A second electrode provided on the above organic light-emitting layer; comprising, The above rectangular phase modulation elements are arranged to form a geometric phase lens, and A light-emitting device that reflects and focuses one-way polarized light by an array of the above-mentioned rectangular phase modulation elements.
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  4. In claim 1, the phase modulation surface of the metal reflective layer comprises a plurality of protrusions forming the rectangular phase modulation element.
  5. In paragraph 4, the phase modulation surface of the metal reflective layer further comprises a plurality of concave portions, forming a light-emitting element.
  6. A light-emitting element according to claim 5, wherein the plurality of protrusions resonate with light of a first wavelength, and the plurality of concave portions absorb light of a second wavelength different from the first wavelength.
  7. In claim 6, the light of the first wavelength is a light-emitting element including red light or green light.
  8. In claim 7, the light of the second wavelength is a light-emitting element including blue light.
  9. In paragraph 4, the plurality of protrusions are light-emitting elements arranged to resonate with blue light.
  10. In any one of claims 1, 4 to 9, the organic light-emitting layer is a light-emitting element that generates white light.
  11. It includes multiple pixels that emit light of different colors, and A metal reflective layer comprising a phase modulation surface having rectangular phase modulation elements formed thereon, a first electrode provided on the metal reflective layer, an organic light-emitting layer provided on the first electrode and emitting white light, and a second electrode provided on the organic light-emitting layer, wherein The above rectangular phase modulation elements are arranged to form a geometric phase lens, and A display device that reflects and focuses one-way polarized light by an array of the above-mentioned rectangular phase modulation elements and outputs it.
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  14. In claim 11, the phase modulation surface of the metal reflective layer comprises a plurality of protrusions, each forming a rectangular phase modulation element.
  15. In claim 14, the phase modulation surface of the metal reflective layer further comprises a plurality of concave portions in a display device.
  16. A display device according to claim 15, wherein the plurality of protrusions resonate with light of a first wavelength, and the plurality of concave portions absorb light of a second wavelength different from the first wavelength.
  17. In paragraph 16, the light of the first wavelength is a display device comprising red light or green light.
  18. In claim 17, the light of the second wavelength is a display device including blue light.
  19. In claim 14, the plurality of protrusions are arranged to resonate blue light in a display device.
  20. In claim 15, the plurality of pixels includes blue, green, and red pixels, and the regions of the metal reflective layer corresponding to the red pixels and green pixels each include the plurality of protrusions and the plurality of concave parts. A display device in which the area corresponding to the blue pixel of the metal reflective layer includes the plurality of protrusions.

Description

Light emitting device and display apparatus including the same This invention relates to a light-emitting element and a display device including the same. An organic light-emitting device (OLED) is a device in which holes supplied from an anode and electrons supplied from a cathode combine within an organic light-emitting layer to emit light of a predetermined color. Display devices utilizing such organic light-emitting devices can exhibit excellent display characteristics such as a wide viewing angle, fast response speed, thin thickness, and high contrast. Such organic light-emitting devices can be applied to various devices, such as display devices for implementing augmented reality or virtual reality. FIG. 1 schematically shows a cross-sectional view of a light-emitting element according to an embodiment. Figure 2 is a schematic plan view showing the phase modulation surface of the metal reflective layer of Figure 1. FIG. 3 is a schematic plan view showing the phase modulation surface of the metal reflective layer of FIG. 1, illustrating a portion of the metal reflective layer. Figure 4 illustrates an exemplary case where a rectangular phase modulation element forms a protrusion. Figure 5 illustrates an exemplary case where a rectangular phase modulation element forms a concave portion. Figures 6, 7a, and 7b show the simulation results of a light-emitting device according to an embodiment in which a geometric phase lens mirror is applied as a metal reflective layer. FIG. 8 schematically shows a cross-sectional view of a light-emitting element according to another embodiment. Figure 9 schematically shows a plan view of the metal reflective layer of Figure 7, illustrating a portion of the metal reflective layer. Figure 10a illustrates how short-wavelength light enters into a concave portion formed on the surface of the base portion of a metal reflective layer. Figure 10b illustrates how long-wavelength light is blocked from entering into the concave portion formed on the surface of the base portion of the metal reflective layer. FIG. 11 is a cross-sectional view illustrating a display device according to an exemplary embodiment. FIG. 12 schematically shows an augmented reality display device in which a display device according to an embodiment is applied as a micro display. FIG. 13 shows an example in which an augmented reality display device, in which a display device according to an embodiment is applied as a micro-display, is implemented as a glasses-type device. Hereinafter, exemplary embodiments will be described in detail with reference to the attached drawings. In the drawings below, the same reference numerals denote the same components, and the size of each component in the drawings may be exaggerated for clarity and convenience of explanation. The embodiments described below are merely exemplary, and various modifications are possible from these embodiments. In the following, terms described as "upper" or "upper" may include not only those directly above in contact but also those above non-contact. Terms such as "first," "second," etc., may be used to describe various components, but are used solely for the purpose of distinguishing one component from another. These terms do not limit differences in the material or structure of the components. A singular expression includes a plural expression unless the context clearly indicates otherwise. Furthermore, when a part is described as "comprising" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. The use of the term "above" and similar descriptive terms may apply to both singular and plural forms. FIG. 1 schematically shows a cross-sectional view of a light-emitting element (100) according to an embodiment. Referring to FIG. 1, a light-emitting element (100) according to an embodiment includes a metal reflective layer (110) having a phase modulation surface, a first electrode (131) provided on the metal reflective layer (110), an organic light-emitting layer (140) provided on the first electrode (131), and a second electrode (132) provided on the organic light-emitting layer (140). Rectangular phase modulation elements may be formed on the phase modulation surface of the metal reflective layer (110), and the rectangular phase modulation elements may be arranged to form a geometric phase lens (GPL). That is, in the light-emitting element (100) according to an embodiment, the metal reflective layer (110) having a phase modulation surface on which rectangular phase modulation elements are formed may be formed to function as a reflective GPL mirror. In this way, by forming rectangular phase modulation elements to have an arrangement of geometric phase lenses on the phase modulation surface of the metal reflective layer (110), the light-emitting element (100) can reflect and focus light of a predetermined polarization and output it. A dielectric layer (120) may b