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EP-3975247-B1 - DISPLAY DEVICE

EP3975247B1EP 3975247 B1EP3975247 B1EP 3975247B1EP-3975247-B1

Inventors

  • KIM, GEUN TAK

Dates

Publication Date
20260506
Application Date
20210924

Claims (11)

  1. A display device (10) comprising: a plurality of subpixels (PXn), each of the plurality of subpixels comprising: a first electrode (RME1) extending in a first direction (DR1); a second electrode (RME2) extending in the first direction and spaced apart from the first electrode (RME1) in a second direction (DR2), a first insulating layer (PAS1) disposed on the first electrode (RME1) and the second electrode (RME2), a plurality of light emitting elements (ED) disposed on the first insulating layer (PAS1) and the first electrode and the second electrode; and extending in an extension direction, a first contact portion (CT1) in the first insulating layer (PAS1), the first contact portion (CT1) exposing the first electrode (RME1), a first contact electrode (CNE1) that extends through the first contact portion (CT1) to electrically connect a first end of each of the plurality of light emitting elements (ED) to the first electrode (RME1), a second contact portion (CT2) in the first insulating layer (PAS1), the second contact portion (CT2) exposing the second electrode (RME2), a second contact electrode (CNE2) that extends through the second contact portion (CT2) to electrically connect a second end of each of the plurality of light emitting elements (ED) to the second electrode (RME2); and a second insulating layer (PAS2) disposed on the first insulating layer (PAS1) and comprising an opening (PO) exposing the first contact portion (CT1), the second contact portion (CT2) and at least two ends of each of the plurality of light emitting elements, wherein the plurality of subpixels comprise: a first subpixel (PX1) comprising first light emitting elements (ED1) each having a first length (LD1) in its extension direction, a second subpixel (PX2, PX3) comprising second light emitting elements (ED2, ED3) each having a second length (LD2, LD3) greater than the first length (LD1) in its extension direction, wherein a width (PO1) of the opening (PO) in the first subpixel (PX1) is equal to or smaller than the second length (LD2, LD3) and greater than the first length (LD1), wherein the width (PO1) of the opening in the first subpixel is defined as being between a first outermost side and a second outermost side of the opening in the first subpixel, wherein the first outermost side and the second outermost side are opposite each other in the second direction (DR2).
  2. The display device of claim 1, wherein the plurality of light emitting elements are disposed on the first electrode (RME1) and the second electrode (RME2) in a direction that crosses the first direction, optionally wherein the direction is parallel to the second direction.
  3. The display device of claim 1 or 2, wherein a first distance (A1) between the first electrode (RME1) and the second electrode (RME2) of the first subpixel (PX1) is smaller than a second distance (A2) between the first electrode (RME1) and the second electrode (RME2) of the second subpixel (PX2).
  4. The display device of claim 3, wherein in the first subpixel (PX1), the first distance is smaller than the first length (LD1) of each of the first light emitting elements.
  5. The display device of claim 3 or 4, wherein widths of the first electrode (RME1) and the second electrode (RME2) of the first subpixel (PX1) are equal to widths of the first electrode (RME1) and the second electrode (RME2) of the second subpixel (PX2), respectively.
  6. The display device of any one of claims 3 to 5, wherein the second distance between the first electrode (RME1) and the second electrode (RME2) of the second subpixel (PX2) is equal to the first length (LD1) of each of the first light emitting elements.
  7. The display device of any one of claims 3 to 6, wherein a difference between the second length of each of the second light emitting elements and the first length (LD1) of each of the first light emitting elements is equal to a sum of widths of portions of the first electrode (RME1) and the second electrode (RME2) which overlap the first light emitting elements.
  8. The display device of any one of claims 3 to 7, wherein the plurality of subpixels further comprise a third subpixel (PX3) comprising third light emitting elements (ED3) each having a third length (LD3) greater than the second length in the direction; optionally wherein a third distance (A3) between the first electrode (RME1) and the second electrode (RME2) of the third subpixel is equal to the second length of each of the second light emitting elements.
  9. The display device of any one of claims 1 to 8, wherein the first electrode (RME1) and the first contact electrode (CNE1) have a same width, the second electrode (RME2) and the second contact electrode (CNE2) have a same width, and a width of a portion of the first electrode (RME1) which overlaps the plurality of light emitting elements is half the width of the first electrode (RME1); optionally wherein a distance between the first electrode (RME1) and the second electrode (RME2) is equal to a difference between a length of each of the light emitting elements and the width of the first electrode (RME1).
  10. The display device of any one of claims 1 to 9, wherein the first subpixel (PX1) further comprises: the second light emitting elements; and third light emitting elements having a third length greater than the second length in the direction; optionally wherein the first electrode (RME1) of the first subpixel (PX1) comprises: a first electrode portion (EP1) on which the first light emitting elements are disposed; a second electrode portion (EP2) on which the second light emitting elements are disposed; and a third electrode portion (EP3) on which the third light emitting elements are disposed; the second electrode of the first subpixel (PX1) comprises: a fourth electrode portion (EP4) on which the first light emitting elements are disposed; a fifth electrode portion (EP5) on which the second light emitting elements are disposed; and a sixth electrode portion (EP6) on which the third light emitting elements are disposed, and a distance between the first electrode portion and the fourth electrode portion is smaller than a distance between the second electrode portion and the fifth electrode part.
  11. The display device of claim 10, wherein the first subpixel (PX1) further comprises: a third electrode (RME3) spaced apart from the first electrode (RME1) in the first direction; a fourth electrode (RME4) spaced apart from the second electrode (RME2) in the first direction; a fifth electrode (RME5) spaced apart from the third electrode in the first direction; and a sixth electrode (RME6) spaced apart from the fourth electrode in the first direction, and the distance between the first electrode (RME1) and the second electrode (RME2) is smaller than a distance between the third electrode and the fourth electrode.

Description

BACKGROUND 1. Technical Field The disclosure relates to a display device. 2. Description of the Related Art Display devices are becoming increasingly important with the development of multimedia. Accordingly, various types of display devices such as organic light emitting displays and liquid crystal displays are being used. A display device is a device for displaying an image and includes a display panel such as an organic light emitting display panel or a liquid crystal display panel. As a light emitting display panel, the display panel may include light emitting elements such as light emitting diodes (LEDs). For example, the LEDs may be organic light emitting diodes (OLEDs) using an organic material as a light emitting material or may be inorganic LEDs using an inorganic material as the light emitting material. KR 20200063386 A discloses a display device comprising: a first electrode and a second electrode spaced apart from the first electrode while being disposed to face the same; a light blocking layer disposed on the upper side of the first electrode and the second electrode; and at least one light emitting element disposed between the first electrode and the second electrode. The light blocking layer includes a light blocking portion absorbing light and an opening pattern. The light blocking portion includes an electrode overlap region partially overlapping the first electrode and the second electrode. The opening pattern exposes a portion of the first electrode and the second electrode facing each other and at least a portion of a region between the first electrode and the second electrode facing each other. The at least one light emitting element may be disposed to overlap the opening pattern. US 2020/251451 A1 discloses a method for selectively bonding LEDs to desired positions on a substrate according to their length, by forming an insulating layer with an opening corresponding to the dimensions of the LED to be bonded. SUMMARY Aspects of the disclosure provide a display device including light emitting elements having different lengths. However, aspects of the disclosure are not restricted to the one set forth herein. The above and other aspects of the disclosure will become more apparent to one of ordinary skill in the art to which the disclosure pertains by referencing the detailed description of the disclosure given below. According to an aspect, there is provided a display device as set out in claim 1. Additional features are set out in claims 2 to 11. BRIEF DESCRIPTION OF THE DRAWINGS The above and other aspects and features of the disclosure will become more apparent by describing in detail embodiments thereof with reference to the attached drawings, in which: FIG. 1 is a schematic plan view of a display device according to an embodiment;FIG. 2 is a schematic plan view of a pixel of the display device according to the embodiment;FIG. 3 is a schematic plan view of a first subpixel of FIG. 2;FIG. 4 is a schematic cross-sectional view taken along lines Q4-Q4', Q5-Q5', and Q6-Q6' of FIG. 3;FIG. 5 is a schematic cross-sectional view taken along lines Q1-Q1', Q2-Q2', and Q3-Q3' of FIG. 2;FIGS. 6 and 7 are schematic partial cross-sectional views of the display device according to the embodiment;FIG. 8 is a schematic partial cross-sectional view of the display device according to the embodiment;FIGS. 9 and 10 are schematic perspective views of light emitting elements according to embodiments;FIG. 11 is a schematic plan view of a pixel of a display device according to an embodiment;FIG. 12 is a schematic cross-sectional view taken along lines Q7-Q7', Q8-Q8', and Q9-Q9' of FIG. 11;FIG. 13 is a schematic partial cross-sectional view of a display device according to an a comparative example not forming part of the invention as claimed;FIG. 14 is a schematic plan view of a subpixel of a display device according to an embodiment;FIG. 15 is a schematic partial cross-sectional view of the display device of FIG. 14;FIG. 16 is a schematic plan view illustrating light emission of light emitting elements in the display device of FIG. 14;FIG. 17 is a schematic plan view of a subpixel of a display device according to another comparative example;FIG. 18 is a partial schematic cross-sectional view of the display device of FIG. 17; andFIG. 19 is a partial schematic cross-sectional view of a display device according to an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS The disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure are shown. This disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will convey the scope of the disclosure to those skilled in the art. It will also be understood that when a layer is referred to as being "on" another layer or subs