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EP-3869559-B1 - DISPLAY DEVICE

EP3869559B1EP 3869559 B1EP3869559 B1EP 3869559B1EP-3869559-B1

Inventors

  • KWAG, JIN OH
  • KANG, JONG HYUK
  • SONG, KEUN KYU
  • JO, SUNG-CHAN
  • CHO, HYUN MIN

Dates

Publication Date
20260513
Application Date
20190415

Claims (15)

  1. A transparent display device comprising: a substrate (SUB) including a display area (DA) and a non-display area (NDA); and a plurality of pixels (PXL) disposed in the display area, and each of the pixels including a plurality of sub-pixels (SP), wherein each of the sub-pixels comprises: a pixel circuit layer (PCL), and a display element layer (DPL) including at least one light emitting element (LD) that emits light, the display element layer comprises: first and second electrodes (REL1, REL2) disposed on a same surface and spaced apart from each other; the light emitting element disposed between the first electrode and the second electrode; a first contact electrode (CNE1) that connects an end of opposite ends of the light emitting element to the first electrode; and a second contact electrode (CNE2) that connects another end of the opposite ends of the light emitting element to the second electrode, and each of the sub-pixels includes: a first area (FA) in which the pixel circuit layer is disposed; and characterized in that a second area (SA) adjacent to the first area in a plan view, the second area including a transmission area (TA) through which light drawn in from the substrate can pass.
  2. The display device according to claim 1, wherein a light transmissivity of the second area is higher than a light transmissivity of the first area.
  3. The display device according to claim 2, wherein the display element layer is disposed in at least one of the first area and the second area.
  4. The display device according to claim 3, wherein the display element layer comprises: a first capping layer (CPL1) disposed on the first electrode and electrically connected to the first electrode; and a second capping layer (CPL2) disposed on the second electrode and electrically connected to the second electrode, wherein the first capping layer and the second capping layer are made of transparent conductive material.
  5. The display device according to claim 3, wherein the pixel circuit layer comprises: at least one transistor disposed on the substrate and electrically connected to the light emitting element; a driving voltage line (DVL) disposed on the substrate and extending from the first area to the second area; and a passivation layer (PSV) disposed over the transistor and the driving voltage line.
  6. The display device according to claim 5, wherein the display element layer is disposed in each of the first area and the second area.
  7. The display device according to claim 6, wherein the first electrode and the second electrode extend from the first area to the second area.
  8. The display device according to claim 6, wherein the first electrode and the second electrode are disposed in each of the first area and the second area, the first electrode disposed in the first area and the first electrode disposed in the second area are spaced apart from each other, and the second electrode disposed in the first area and the second electrode disposed in the second area are spaced apart from each other.
  9. The display device according to claim 6, wherein in each of the sub-pixels, the first capping layer extends from the first area to the second area and electrically connects the first electrode of the first area to the first electrode of the second area, and in each of the sub-pixels, the second capping layer extends from the first area to the second area and electrically couples the second electrode of the first area to the second electrode of the second area.
  10. The display device according to claim 5, wherein the display element layer is disposed in the first area and overlaps the pixel circuit layer.
  11. The display device according to claim 10, wherein the display element layer further comprises a connection line (CNL) that connects the driving voltage line to the second electrode; optionally wherein the connection line and the second capping layer are integral with each other; optionally wherein the connection line and the second electrode are integral with each other.
  12. The display device according to claim 5, wherein the second area comprises: a 2-1th area (SA_1) in which the display element layer is disposed, and a 2-2th area (SA_2) adjacent to the 2-1th area, and the display element layer is not disposed in the 2-2th area; optionally wherein an additional conductive pattern (ARP) that electrically connects the driving voltage line to the second electrode and is disposed in the second area; optionally wherein the additional conductive pattern and the driving voltage line are integral with each other, and the additional conductive pattern is electrically connected to the second electrode through a contact hole passing through the passivation layer.
  13. The display device according to claim 5, wherein a light shielding layer is disposed in the first area of each of the sub-pixels, and the light shielding layer is disposed between the substrate and the transistor; optionally wherein the light shielding layer blocks light from a rear surface of the substrate.
  14. The display device according to claim 1, wherein the light emitting element comprises a subminiature light emitting diode having a shape of a cylinder or polyprism and having a microscale or nanoscale size.
  15. The display device of claim 1, wherein: the first and second electrodes are disposed on each of the first and the second areas, and spaced apart from each other in each corresponding area; the light emitting element is disposed between the first electrode and the second electrode in each of the first and the second areas, a capping layer (CPL) is disposed on each of the first and the second electrodes and extends from the first area to the second area; the first contact electrode connects an end of opposite ends of the light emitting element to the first electrode in each of the first and the second areas; and the second contact electrode connects another end of the opposite ends of the light emitting element to the second electrode in each of the first and the second areas.

Description

Technical Field Various embodiments of the disclosure relate to a display device, and more particularly, to a display device including a subminiature light emitting element. Background Art A light emitting diode may have relatively satisfactory durability even under poor environmental conditions, and have excellent performance in terms of lifetime and luminance. Recently, research on the technology of applying such light emitting diodes to various display devices has become appreciably more active. As a part of such research, technologies are being developed of fabricating a light emitting diode having a subminiature size corresponding to the micro-scale or the nano-scale using an inorganic crystalline structure, e.g., a structure obtained by growing a nitride-based semiconductor. To apply the LED to a lighting device, a display device, or the like, there is a need to couple the LED to an electrode so that the voltage of the power supply may be applied to the LED. With regard to application purposes of the LED, a method of reducing space needed for the electrode, or a method of fabricating the LED, various research on arrangement relationships between the LED and the electrode have been conducted. US20180019369 discloses a display apparatus including a substrate, a first electrode on the substrate, the first electrode including a first portion that has a flat upper surface and a second portion that protrudes from the first portion and has an inclined surface, a second electrode facing the first electrode in parallel on the substrate, the second electrode including a first portion that has a flat upper surface and a second portion that protrudes from the first portion and has an inclined surface, and a plurality of light-emitting devices separate from each other on the first electrode and the second electrode, the light-emitting devices each having a first end contacting the upper surface of the first portion of the first electrode and a second end contacting the upper surface of the first portion of the second electrode. Disclosure Technical Problem Various embodiments of the disclosure are directed to a display device having enhanced light transmissivity. Technical Solution Advantageous Effects An embodiment of the disclosure may provide a display device having enhanced light transmissivity. The effects of the disclosure are not limited by the foregoing, and other various effects are anticipated herein. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is a perspective view schematically illustrating a light emitting element in accordance with an embodiment of the disclosure.FIG. 1b is a sectional view schematically illustrating the light emitting element of FIG. 1a.FIG. 1c is a perspective view schematically illustrating a modified embodiment of the light emitting element of FIG. 1a.FIG. 1d is a sectional view schematically illustrating the light emitting element of FIG. 1c.FIG. 2 illustrates a display device in accordance with an embodiment of the disclosure, and particularly, is a schematic plan view illustrating a display device using the light emitting element illustrated in FIG. 1a as a light emitting source.FIGS. 3a to 3c are circuit diagrams schematically illustrating examples of a unit emission area of the display device of FIG. 2 in accordance with various embodiments.FIG. 4 is a plan view schematically illustrating first to third sub-pixels included in one of pixels illustrated in FIG. 2.FIG. 5 is a schematic sectional view taken along line I-I' of FIG. 4.FIG. 6 illustrates another shape of a partition wall illustrated in FIG. 5, and is a schematic sectional view taken along line I-I' of FIG. 4.FIG. 7 schematically illustrates a display device in accordance with an embodiment of the disclosure, and is a sectional diagram corresponding to line I-I' of FIG. 4.FIG. 8 is a plan view schematically illustrating a pixel of a display device in accordance with an embodiment of the present disclosure.FIG. 9 is a schematic sectional view taken along line II-II' of FIG. 8.FIG. 10 is a plan view schematically illustrating a pixel of a display device in accordance with an embodiment of the present disclosure.FIG. 11 is a schematic sectional diagram taken along line III-III' of FIG. 10.FIG. 12 is a plan view schematically illustrating a pixel of a display device in accordance with an embodiment of the present disclosure.FIG. 13 is a schematic sectional diagram taken along line IV-IV' of FIG. 12.FIGS. 14 and 15 illustrate an embodiment of a first sub-pixel of FIG. 4, and are plan views schematically illustrating the first sub-pixel including only some components of a display element layer.FIG. 16 illustrates an embodiment of the first sub-pixel of FIG. 14, and is a plan view schematically illustrating the first sub-pixel including only some components of the display element layer.FIG. 17 illustrates an embodiment of the first sub-pixel of FIG. 8, and is a plan view schematically illustrating the first sub-pixel includi