Search

EP-4478864-B1 - LIGHT EMITTING DISPLAY DEVICE

EP4478864B1EP 4478864 B1EP4478864 B1EP 4478864B1EP-4478864-B1

Inventors

  • LEE, SANG SHIN
  • KANG, YEONJU
  • KIM, SANGHOON
  • LEE, SEUNG JIN
  • LEE, YURI
  • JANG, Minji

Dates

Publication Date
20260513
Application Date
20240327

Claims (18)

  1. A light emitting display device, comprising: a unit pixel group having at least two unit pixels (PXU11, PXU12, PXU21, PXU22), wherein a unit pixel (PXU11, PXU12, PXU21, PXU22) from among the at least two unit pixels (PXU11, PXU12, PXU21, PXU22) includes a first light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2), a second light emitting layer (EML11b, EML12b, EML21b, EML22b), and a third light emitting layer (EML11c, EML12c, EML21c, EML22c) corresponding to three primary colors, the first light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2) includes two sub-light emitting layers (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2) in one unit pixel (PXU11, PXU12, PXU21, PXU22), at least one electrical connection formed by a laser drilling position (LDP) in the unit pixel group configured to connect a cathode to an underlying electrical layer, the unit pixel group comprises first, second and third light emitting layers (EML21a1, EML12a1, EML22b, EML11c) adjacent to the laser drilling position (LDP) and at least second and third light emitting layers (EML11b, EML12b, EML21b, EML12c, EML21c, EML22c) spaced apart from the laser drilling position (LDP), characterized in that at least the second light emitting layer (EML22b) and the third light emitting layer (EML11c) adjacent to the laser drilling position (LDP) include a recess in a plan view, respectively, the recess faces to the laser drilling position (LDP) in a plan view, the size of an area of the second light emitting layer (EML22b) adjacent to the laser drilling position (LDP) and the size of an area of the second light emitting layer (EML11b, EML12b, EML21b) spaced apart from the laser drilling position (LDP) have an area difference of greater than 0% and less than 10%, and the size of an area of the third light emitting layer (EML11c) adjacent to the laser drilling position (LDP) and the size of an area of the third light emitting layer (EML12c, EML21c, EML22c) spaced apart from the laser drilling position (LDP) have an area difference of greater than 0% and less than 10%.
  2. The light emitting display device of claim 1, wherein the second light emitting layer (EML22b) and the third light emitting layer (EML11c) adjacent to the laser drilling position (LDP) are formed of a second modified light emitting layer (EML22b) and a third modified light emitting layer (EML11c) including the recess, respectively, the second light emitting layer (EML11b, EML12b, EML21b) and the third light emitting layer (EML12c, EML21c, EML22c) spaced apart from the laser drilling position (LDP) are formed of a second normal light emitting layer (EML11b, EML12b, EML21 b) and a third normal light emitting layer (EML12c, EML21c, EML22c) that are free of a recess in a plan view, respectively.
  3. The light emitting display device of claim 2, wherein: a planar shape of the second normal light emitting layer (EML11b, EML12b, EML21b) and the third normal light emitting layer (EML12c, EML21c, EML22c) is a quadrangle shape, and corners are chamfered or rounded.
  4. The light emitting display device of claim 1, wherein: the second light emitting layer (EML11b, EML12b, EML21b) and the third light emitting layer (EML12c, EML21c, EML22c) spaced apart from the laser drilling position (LDP) have recesses positioned on a side different from a side on which the recesses are positioned in the second and third light emitting layers ( EML22b, EML11c) adjacent to the laser drilling position (LDP), respectively.
  5. The light emitting display device of claim 4, wherein: the unit pixel group includes four unit pixels (PXU11, PXU12, PXU21, PXU22), the second light emitting layers (EML11b, EML12b, EML21b, EML22b) and the third light emitting layers (EML11c, EML12c, EML21c, EML22c) have a rectangular shape except for the recess, and have chamfered or rounded corners, the unit pixel group includes four second light emitting layers (EML11b, EML12b, EML21 b, EML22b) and four third light emitting layers (EML11c, EML12c, EML21c, EML22c) with one second light emitting layer (EML22b) and one third light emitting layer (EML11c) adjacent to the laser drilling position (LDP), and the recesses in the second light emitting layers (EML11b, EML12b, EML21 b, EML22b) of all second light emitting layers (EML11b, EML12b, EML21 b, EML22b) are positioned at different corners with respect to each other and/or the recesses in the third light emitting layers (EML11c, EML12c, EML21c, EML22c) of all third light emitting layers (EML11c, EML12c, EML21c, EML22c) are positioned at different corners with respect to each other.
  6. The light emitting display device of claim 1 or 2, wherein: the recess of the second light emitting layer (EML22b) adjacent to the laser drilling position (LDP) and the recess of the third light emitting layer (EML11c) adjacent to the laser drilling position (LDP) is formed at a side of the laser drilling position (LDP) of the second light emitting layer (EML22b) and the third light emitting layer (EML11c), respectively.
  7. The light emitting display device of claim 6, wherein: the recess is respectively formed at a corner portion of the second light emitting layer (EML22b) adjacent to the laser drilling position (LDP) facing the laser drilling position (LDP), and at a corner portion of the third light emitting layer (EML11c) adjacent to the laser drilling position (LDP) facing the laser drilling position (LDP).
  8. The light emitting display device of at least one of claims 1 to 7, wherein at least one recess or each recess facing the laser drilling position (LDP) has a concave shape, especially a circular arc shape, preferably concentric to a center of the laser drilling position (LDP) and/or an outer circumference of the laser drilling position (LDP), in a plan view.
  9. The light emitting display device of at least one of claims 1 to 8, wherein: the first light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2) is formed of a first normal light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2) that does not include recesses.
  10. The light emitting display device of claim 9, wherein: the first light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2) included in one of the unit pixels (PXU11, PXU12, PXU21, PXU22) includes a first-1 light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1) and a first-2 light emitting layer (EML11a2, EML12a2, EML21a2, EML22a2), the first-1 light emitting layer EML11a1, EML12a1, EML21a1, EML22a1) and the first-2 light emitting layer (EML11a2, EML12a2, EML21a2, EML22a2) each have a rectangular shape in a plan view, and have chamfered or rounded corners, a direction in which the first-1 light emitting layer EML11a1, EML12a1, EML21a1, EML22a1) is elongated is different from a direction in which the first-2 light emitting layer (EML11a2, EML12a2, EML21a2, EML22a2) is elongated.
  11. The light emitting display device of claim 10, wherein: a light emitting device including the first-1 light emitting layer EML11a1, EML12a1, EML21a1, EML22a1) and a light emitting device including the first-2 light emitting layer (EML11a2, EML12a2, EML21a2, EML22a2) are electrically connected to the same pixel driving unit (PCa, PCb, PCc) through a connection line (CLa, CLb), and are included in one of the unit pixels (PXU11, PXU12, PXU21, PXU22).
  12. The light emitting display device of claim 11, wherein: the laser drilling position (LDP) is positioned in a center area of a unit pixel (PXU11, PXU12, PXU21, PXU22), and a portion of the connection line (CLb) extends along an outer edge of the unit pixel (PXU11, PXU12, PXU21, PXU22).
  13. The light emitting display device of at least one of claims 1 to 12, wherein: a first light emitting layer (EML21a1, EML12a2) adjacent to the laser drilling position (LDP) is formed as a first modified light emitting layer (EML21a1, EML12a2) including a recess in a plan view, and a first light emitting layer (EML11a1, EML12a1, EML22a1, EML11a2, EML21a2, EML22a2) spaced apart from the laser drilling position (LDP) is formed as a first normal light emitting layer (EML11a1, EML12a1, EML22a1, EML11a2, EML21a2, EML22a2) without a recess in a plan view, the size of an area of the first modified light emitting layer (EML21a1, EML12a2) and the size of an area of the first normal light emitting layer (EML11a1, EML12a1, EML22a1, EML11a2, EML21a2, EML22a2) are the same or have an area difference of less than 10%.
  14. The light emitting display device of claim 13, wherein: the first normal light emitting layer (EML11a1, EML12a1, EML22a1, EML11a2, EML21a2, EML22a2) has a rectangular shape in a plan view, and has chamfered or rounded corners, two first modified light emitting layers (EML21a1, EML12a2) are included in one unit pixel (PXU11, PXU12, PXU21, PXU22), and the two first modified light emitting layers (EML21a1, EML12a2) are elongated and have different directions.
  15. The light emitting display device of at least one of claims 2 or 6 to 14, when not dependent on claim 4, wherein: the second modified light emitting layer (EML22b) extends in a straight line at the corners facing the second normal light emitting layer (EML11b, EML12b, EML21b), in a plan view, and the third modified light emitting layer extends in a straight line at a corner portion facing the third normal light emitting layer (EML12c, EML21c, EML22c), in a plan view.
  16. The light emitting display device of at least one of claims 1 to 15, wherein: the unit pixel group includes four unit pixels (PXU11, PXU12, PXU21, PXU22), and the laser drilling position (LDP) is positioned over all of the four unit pixels (PXU11, PXU12, PXU21, PXU22)and optionally, wherein: a center of the laser drilling position (LDP) is positioned in one of the four unit pixels (PXU11, PXU12, PXU21, PXU22), or a center of the laser drilling position (LDP) is positioned at a point where the four unit pixels (PXU11, PXU12, PXU21, PXU22) meet, or wherein the unit pixel group includes four unit pixels (PXU11, PXU12, PXU21, PXU22), and the laser drilling position (LDP) is positioned across one or two of the four unit pixels (PXU11, PXU12, PXU21, PXU22)
  17. The light emitting display device of at least on of claims 1 to 16, wherein: the laser drilling positions (LDP) are different from each other in at least two different unit pixel groups.
  18. The light emitting display device of at least on of claims 1 to 17, wherein a distance between the recess portion of the third light emitting layer (EML11c) and a recess portion of the second light emitting layer (EML22b) has a size that is up to twice that of a distance (Gap1) between the first light emitting layer (EML11a1, EML12a1, EML21a1, EML22a1, EML11a2, EML12a2, EML21a2, EML22a2) and the third light emitting layer (EML11b, EML12b, EML21b, EML12c, EML21c, EML22c).

Description

BACKGROUND 1. Field The present invention relates to a light emitting display device. 2. Description of the Related Art A display device is a device that includes a screen or display panel that displays images, and includes a liquid crystal display (LCD), an organic light emitting diode (OLED), and the like. Such display devices are used in various electronic devices such as mobile phones, navigation devices, digital cameras, electronic books, portable game consoles, and terminals. Organic light emitting display devices generally have self-luminance characteristics and, unlike a liquid crystal display devices, generally do not require a separate light source, so the thickness and weight can be relatively reduced. In addition, organic light emitting diode displays have relatively high-quality characteristics such as relatively low power consumption, relatively high luminance, and relatively fast response speed. The above information disclosed in this Background section is only for enhancement of understanding of the background and therefore the information discussed in this Background section does not necessarily constitute prior art. US2022344440A1 relates to a display device wherein electrical connections are done by a laser light based drilling process to expose a portion of a conducive layer below. WO2023024901 A1 relates to a display device comprising a plurality of openings and recesses to allow space for connection holes. WO2023052908A1 relates to a display device comprising a plurality of pixel geometries spanning from rectangular shapes with rounded corners, triangular shapes with rounded corners to hexagonal shapes. SUMMARY The present invention provides a light emitting display device with an increased space between adjacent light emitting layers for removing an insulation layer by laser irradiation, especially for electrically connecting a cathode with an underlying electrical layer such as a connection electrode. The invention may provide a high-resolution light emitting display device. The invention provides a light emitting display device in which light emitting devices of the same color have the same lifetime. A light emitting display device according to the present invention comprises a unit pixel group having at least two unit pixels, wherein a unit pixel from among the at least two unit pixels includes a first light emitting layer, a second light emitting layer, and a third light emitting layer corresponding to three primary colors, the first light emitting layer includes two sub-light emitting layers in one unit pixel, at least one laser drilling position formed in the unit pixel group, the unit pixel group comprises first second and third light emitting layers adjacent to the laser drilling position and at least second and third light emitting layers spaced apart from the laser drilling position, at least the second light emitting layer and the third light emitting layer adjacent to the laser drilling position includes a recess, the size of an area of the second light emitting layer adjacent to the laser drilling position and the size of an area of the second light emitting layer spaced apart from the laser drilling position have an area difference of greater than 0% and of less than 10%, and the size of an area of the third light emitting layer adjacent to the laser drilling position and the size of an area of the third light emitting layer spaced apart from the laser drilling position have an area difference of greater than 0% and of less than 10%. The recess in the light emitting layer adjacent the laser drilling position especially is larger than any other reduced corner area of another or the same light emitting layer, which other corner area is reduced due to the form of a rounded a chamfered corner. The at least one recess or each recess facing the laser drilling position may have a concave shape, especially a circular arc shape, preferably concentric to a center of the laser drilling position and/or an outer circumference of the laser drilling position, in a plan view. A light emitting display device according to some embodiments includes one unit pixel group composed of at least two unit pixels, one unit pixel including a first light emitting layer, a second light emitting layer, and a third light emitting layer corresponding to three primary colors, the first light emitting layer including two first light emitting layers in one unit pixel, a laser drilling position is formed in a part of the unit pixel group, and the second light emitting layer and the third light emitting layer adjacent to the laser drilling position include a second modified light emitting layer including a recess, the second and third normal light emitting layers are formed of a third modified light emitting layer, and the second and third light emitting layers are formed of a second normal light emitting layer and a third normal light emitting layer that do not include recesses, and the area of the second m