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EP-3761367-B1 - DISPLAY DEVICE

EP3761367B1EP 3761367 B1EP3761367 B1EP 3761367B1EP-3761367-B1

Inventors

  • JANG, MI
  • KWON, DO HYUN
  • LEE, MIN JUNG

Dates

Publication Date
20260513
Application Date
20200629

Claims (13)

  1. A display device, comprising: a substrate (110); a plurality of transistors (TR1, TR2) disposed on the substrate (110); and a multi-layer insulating film (180) disposed on the transistors (TR1, TR2), wherein the multi-layer insulating film (180) includes a first insulating film (181) and a second insulating film (182) contacting each other, the multi-layer insulating film (180) includes a first region in which the first insulating film (181) and the second insulating film (182) overlap each other in a direction perpendicular to the substrate (110) and a second region in which the first insulating film (181) is disposed, wherein the second insulating film (182) does not overlap the second region, the first insulating film (181) includes an inorganic material, the first region overlaps the plurality of transistors (TR1, TR2), the second region is disposed outside of the transistors (TR1, TR2) as viewed in the direction perpendicular to the substrate (110), and an elastic modulus of the second insulating film (182) is lower than an elastic modulus of the first insulating film (181), characterised in that the second insulating film (182) includes an organic material.
  2. The display device of claim 1, wherein a plurality of the second insulating films (182) overlaps the transistors (TR1, TR2) and are spaced apart from each other, and the first insulating film (181) is disposed between the second insulating films (182) and on an upper surface of the second insulating films (182).
  3. A display device, comprising: a substrate (110); a plurality of transistors (TR1, TR2) disposed on the substrate (110); and a multi-layer insulating film (180) disposed on the transistors (TR1, TR2), wherein the multi-layer insulating film (180) includes a first insulating film (181), a second insulating film (182), and a third insulating film (183), the multi-layer insulating film (180) includes a first region and a second region, the first insulating film (181) includes an inorganic material, the first region overlaps the transistors (TR1, TR2) and the second region is disposed outside of the transistors (TR1, TR2) as viewed in the direction perpendicular to the substrate (110), the elastic modulus of the second insulating film (182) is lower than an elastic modulus of the first insulating film (181) and an elastic modulus of the third insulating film (183), characterised in that the second insulating film (182) includes an organic material, the second insulating film (182), the third insulating film (183), and the first insulating film (181) are arranged in sequence in the first region, the third insulating film (183), the second insulating film (182), and the first insulating film (181) are arranged in sequence in the second region.
  4. The display device of claim 1, wherein the multi-layer insulating film (180) includes a third insulating film (184), the third insulating film (184) and the first insulating film (181) overlap each other in the second region, and a modulus of the third insulating film (184) is larger than a modulus of the second insulating film (182).
  5. The display device of claim 1, further comprising: an interlayer insulating film (160) disposed on the transistors (TR1, TR2); and the multi-layer insulating film (180) is disposed on the interlayer insulating film (160), the second insulating film (182) contacts the interlayer insulating film (160) in the first region, the first insulating film (181) contacts the interlayer insulating film (160) in the second region.
  6. The display device of at least one of claims 1 to 5, wherein the modulus of the first insulating film (181) is 5 to 30 times the modulus of the second insulating film (182).
  7. The display device of at least one of claims 1 to 6, wherein the modulus of the first insulating film (181) is 80 GPa to 150 GPa.
  8. The display device of at least one of claims 1 to 7, wherein the modulus of the second insulating film (182) is 5 GPa to 10 GPa.
  9. The display device of at least one of claims 1 to 8, wherein the first region overlaps a data line (171).
  10. The display device of at least one of claims 1 to 9, wherein the first region is disposed between adjacent scan lines (151, 152).
  11. The display device of at least one of claims 1 to 10, further comprising: an interlayer insulating film (160) disposed between the transistors (TR1, TR2) and the multi-layer insulating film (180), wherein the interlayer insulating film (160) and the second insulating film (182) contact each other in the first region, and the interlayer insulating film (160) and the first insulating film (181) or the third insulating film (183, 184) contact each other in the second region.
  12. The display device of at least one of claims 3 and 4 and 6 to 11 when not dependent on claim 5, wherein the second insulating film (182) includes a plurality of portions spaced apart from each other, and the third insulating film (183, 184) contacts upper and side surfaces of the portions of the second insulating film (182).
  13. The display device of at least one of claims 3 and 4 and 6 to 12 when not dependent on claim 5, wherein the first insulating film (181) and the third insulating film (183, 184) include the same material.

Description

(a) Technical Field The present invention relates to a display device. (b) Description of the Related Art Display devices for presentation of information in visual form may include a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting diode device (OLED device), a field effect display (FED), an electrophoretic display device, and the like. Since the OLED device has a self-luminance characteristic and does not use a separate light source, a thickness and weight thereof may be reduced. In addition, since the OLED device has high-grade characteristics such as low power consumption, high luminance, and high response speed, the OLED device is being developed as a next-generation display device. Recently, a bendable, foldable, or extensible display device has been developed. In an extensible display device, light-emitting elements are formed on a stretchable substrate. However, when the stretchable substrate is stretched or an impact is applied thereto, the light-emitting elements or wires stacked on an upper portion of the stretchable substrate may be damaged. US2017077199 A1 discloses a bendable OLED display having an incompressible liquid layer disposed between the transistors and the OLEDs. SUMMARY An exemplary embodiment of the present invention provides a display device according to claim 1 including: a substrate; a plurality of transistors disposed on the substrate; and a multi-layer insulating film disposed on the transistors, wherein the multi-layer insulating film may include a first insulating film and a second insulating film contacting each other, the multi-layer insulating film includes a first region in which the first insulating film and the second insulating film overlap each other in a direction perpendicular to the substrate and a second region in which the first insulating film is disposed, wherein the second insulating film does not overlap the second region, the first region overlaps the plurality of transistors, and an elastic modulus of the second insulating film is lower than an elastic modulus of the first insulating film. Thus, in the second region there is disposed only the first insulating film of the both insulating films but not the second insulting film. Furthermore, the first insulating film includes an inorganic material, and the second insulating film includes an organic material. The second insulating film may be below the first insulating film in the first region, that is between the substrate and the first insulating film. When used herein, the term modulus refers to the elastic modulus or Young's modulus of the respective film or layer. A plurality of second insulating films may overlap the transistors and be spaced apart from each other, and the first insulating film may be disposed between the second insulating films and on an upper surface of the second insulating films. The second insulating films may be spaced apart from each other in a direction parallel to the substrate and the first insulating film may be disposed between the second insulating films in the direction parallel to the substrate. In other words, the second insulating film may include a plurality of portions spaced apart from each other (in the direction parallel to the substrate), and the first insulating film may be disposed between the portions of the second insulating film and on an upper surface of the portions of the second insulating film. The second region does not overlap the transistors in the direction perpendicular to the substrate. Thus, the second region is disposed outside of the transistors as viewed in the direction perpendicular to the substrate. The modulus of the first insulating film may be 5 to 30 times the modulus of the second insulating film. The modulus of the first insulating film may be 80 GPa to 150 GPa. The modulus of the second insulating film may be 5 GPa to 10 GPa. The first region may overlap the data line. The first region may be disposed between a plurality of scan lines. The display device may further include an interlayer insulating film disposed between the transistor and the multi-layer insulating film, the interlayer insulating film and the second insulating film may contact each other in the first region, and the interlayer insulating film and the first insulating film may contact each other in the second region. Another exemplary embodiment of present invention according to claim 3 provides a display device including: a substrate; a plurality of transistors disposed on the substrate; and a multi-layer insulating film disposed on the transistors, wherein the multi-layer insulating film may include a first insulating film, a second insulating film, and a third insulating film, the multi-layer insulating film includes a first region and a second region, the second insulating film, the third insulating film, and the first insulating film are arranged in sequence in the first region, the third insulating film, the second insulating fi