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KR-20260065440-A - COVER WINDOW, METHOD FOR MANUFACTURING COVER WINDOW, AND ELECTRONIC DEVICE INCLUDING COVER WNDOW

KR20260065440AKR 20260065440 AKR20260065440 AKR 20260065440AKR-20260065440-A

Abstract

A cover window, a method for manufacturing a cover window, and an electronic device including a cover window are provided. A cover window according to one embodiment includes a first surface, a second surface facing the first surface, and a plurality of sides disposed between the first surface and the second surface. The radius of curvature of each of the plurality of sides is 15R to 25R. Among the plurality of sides, the first side includes a plurality of etching holes. The difference between the maximum height and the minimum height of the plurality of etching holes that overlap each other in the extension direction of the first side is 0.1㎛ to 0.5㎛.

Inventors

  • 김형식
  • 김정호
  • 김종기
  • 미쉬칙 콘스탄틴
  • 유경한
  • 장승훈
  • 정우현

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260508
Application Date
20241121
Priority Date
20241031

Claims (20)

  1. Page 1; A second surface facing the first surface above; and It includes a plurality of sides disposed between the first surface and the second surface, and The radius of curvature of each of the above plurality of sides is 15R to 25R, and Among the above plurality of sides, the first side includes a plurality of etching holes, and A cover window in which the difference between the maximum height and the minimum height of the plurality of etching holes that overlap each other in the extension direction of the first side is 0.1㎛ to 0.5㎛.
  2. In Article 1, A cover window in which the difference between the radius of curvature of the second side and the radius of curvature of the first side among the plurality of sides is 2.5R or less.
  3. In Article 1, A cover window having a width of 10㎛ to 20㎛ on the first side.
  4. In Article 1, A cover window with a thickness of 30㎛ to 60㎛.
  5. Page 1; A second surface facing the first surface above; and It includes a first side positioned between the first surface and the second surface, and The above-mentioned first aspect is, A first central side having a radius of curvature of 7R to 13R; A first upper side positioned between the first surface and the first central side; and A cover window comprising a first lower side positioned between the second side and the first central side.
  6. In Article 5, The first upper side and the first lower side are flat cover windows.
  7. In Article 5, The first central side above includes a plurality of etched holes, and A cover window in which the difference between the maximum height and the minimum height of the plurality of etching holes in the extension direction of the first side is 0.1 to 0.5 μm.
  8. In Article 5, A cover window in which the width of the first upper side is larger than the width of the first central side.
  9. In Article 5, A cover window in which the width of the first lower side is larger than the width of the first central side.
  10. A step of using a laser device to irradiate a laser beam onto an area corresponding to a plurality of cover windows on a substrate, thereby separating the plurality of cover windows from the substrate and simultaneously forming laser spots on the edges of each of the plurality of cover windows; A step of loading the above plurality of cover windows into a cassette; and A method for manufacturing a cover window comprising the step of etching the plurality of cover windows of the cassette using an etching solution to reduce the thickness of the plurality of cover windows and simultaneously form the sides of each of the plurality of cover windows.
  11. In Article 10, A method for manufacturing a cover window in which the radius of curvature of each of the sides of each of the plurality of cover windows is 15R to 25R.
  12. In Article 10, The step of using the laser device to irradiate a laser beam onto an area corresponding to the plurality of cover windows on the substrate to separate the plurality of cover windows from the substrate while simultaneously forming laser spots on the edges of each of the plurality of cover windows is A method for manufacturing a cover window comprising the step of scanning the laser beam multiple times in an area corresponding to one of the plurality of cover windows.
  13. In Article 12, One scan of the above laser beam includes a plurality of first laser spots and a plurality of second laser spots, and A method for manufacturing a cover window in which the plurality of first laser spots and the plurality of second laser spots do not overlap each other in the thickness direction of the cover window.
  14. In Article 13, A method for manufacturing a cover window in which the length of each of the plurality of first laser spots and the plurality of second laser spots in the thickness direction of the cover window is 2 μm to 20 μm.
  15. In Article 13, A method for manufacturing a cover window in which, in the thickness direction of the cover window, the distance between the centers of two adjacent first laser spots among the plurality of first laser spots is 5 μm to 15 μm.
  16. In Article 13, The distance between the plurality of first laser spots in the thickness direction of the cover window and in a direction orthogonal to the scan direction of the laser device is 0㎛ to 2㎛, and A method for manufacturing a cover window in which the distance between the plurality of first laser spots in the scanning direction of the laser device is 5㎛ to 15㎛.
  17. In Article 13, A method for manufacturing a cover window in which the distance between the plurality of second laser spots in the scanning direction of the laser device is 5㎛ to 15㎛.
  18. In Article 13, A method for manufacturing a cover window in which at least two of the plurality of second laser spots overlap each other in the thickness direction of the cover window.
  19. In Article 13, A method for manufacturing a cover window in which the minimum distance between the plurality of first laser spots and the plurality of second laser spots in a direction orthogonal to the thickness direction of the cover window and the scan direction of the laser device is 3 μm or more.
  20. In Article 13, A method for manufacturing a cover window in which the sum of the number of the plurality of first laser spots and the number of the plurality of second laser spots is 10 to 50.

Description

Cover window, method for manufacturing a cover window, and electronic device including a cover window The present invention relates to a cover window, a method for manufacturing a cover window, and an electronic device including a cover window. As the information society develops, the demand for display devices for displaying images is increasing in various forms. Display devices may be liquid crystal displays, field emission displays, light-emitting displays, etc. Light-emitting displays may include organic light-emitting displays that include organic light-emitting diode elements as light-emitting elements, or inorganic light-emitting displays that include inorganic light-emitting diode elements as light-emitting elements. Recently, flexible display devices, such as bendable display devices with a bendable display area or foldable display devices with a foldable display area, are being released to enhance portability while providing a large display screen. The cover window of a flexible display device must have flexible characteristics to enable folding. In addition, to improve the mechanical strength of the cover window of a flexible display device, the sides of the cover window are machined using a CNC (computer numerical control) grinding device and wet etching processes are performed. However, there is a disadvantage that the manufacturing cost of the cover window is high due to defects such as wedges and chipping occurring on the sides of the cover window during the CNC process. FIGS. 1 and FIGS. 2 are perspective views showing a display module according to one embodiment. FIG. 3 is an exploded perspective view showing a display module according to one embodiment. FIG. 4 is a block diagram showing a display module according to one embodiment. FIG. 5 is an equivalent circuit diagram showing a pixel of a display module according to one embodiment. FIG. 6 is an equivalent circuit diagram showing a pixel of a display module according to another embodiment. FIG. 7 is an equivalent circuit diagram showing a pixel of a display module according to another embodiment. FIGS. 8 and FIGS. 9 are cross-sectional views showing a display module according to one embodiment. FIG. 10 is a cross-sectional view showing in detail an example of the display area of the display module illustrated in FIG. 8 and FIG. 9. FIG. 11 is a cross-sectional view showing another example of the display area of the display module illustrated in FIG. 8 and FIG. 9. FIG. 12 is a detailed cross-sectional view showing an example of the light-emitting diode element of FIG. 11. FIGS. 13 and FIGS. 14 are side views showing a display module according to another embodiment. FIG. 15 is a cross-sectional view showing an example of a display area of a display module illustrated in FIG. 13 and FIG. 14. FIGS. 16 and FIGS. 17 are perspective views showing a cover window according to one embodiment. FIG. 18 is a plan view showing a cover window according to one embodiment. FIGS. 19 to 22 are cross-sectional views showing first to fourth sides of a cover window according to one embodiment. FIG. 23 is a cross-sectional view showing the first side of the cover window of FIG. 19 in detail. FIG. 24 is a three-dimensional image showing the first side of the cover window of FIG. 19 in detail. Figure 25 is an example drawing to explain the bending strength of a cover window. Figure 26 is a graph showing an experimental example of the flexural strength of a cover window. FIG. 27 is a cross-sectional view showing an example of a first side of the cover window of a first sample. FIG. 28 is an example drawing illustrating a Charpy impact test of a cover window. Figure 29 is a graph showing an experimental example of a Charpy impact test on a cover window. FIG. 30 is a cross-sectional view showing an example of the first side of the cover window of the second sample. FIGS. 31 to 34 are side views showing first to fourth sides of a cover window according to another embodiment. FIG. 35 is a flowchart showing a method for manufacturing a cover window according to one embodiment. FIGS. 36 to 39 are perspective views for explaining a method of manufacturing a display device according to one embodiment. FIG. 40 is a cross-sectional view showing an example of a cross-section of a mosquito board cut along X40-X40' of FIG. 36. FIG. 41 is a cross-sectional view showing an example of a cross-section of a cover window cut along X41-X41' of FIG. 37. FIG. 42 is a cross-sectional view showing an example of a cross-section of a cover window cut along X42-X42' of FIG. 39. FIG. 43 is a perspective view showing a laser device according to one embodiment. FIG. 44 is an example drawing showing the polarization of an output beam according to the rotation of a laser device according to one embodiment. FIG. 45 is another example drawing showing the polarization of an output beam according to the rotation of a laser device according to one embodiment. FIGS. 46 to 53 are perspective views show