	US 12,410,092 B2
	Manufacturing method of cover window for flexible display device and manufacturing method of the flexible display device
Seung Kim, Seongnam-si (KR); Byung Hoon Kang, Hwaseong-si (KR); Seung Ho Kim, Anyang-si (KR); Gyu In Shim, Yongin-si (KR); Joo Woan Cho, Seongnam-si (KR); and Byoung Kwon Choo, Hwaseong-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Mar. 25, 2021, as Appl. No. 17/212,885.
Claims priority of application No. 10-2020-0101609 (KR), filed on Aug. 13, 2020.
Prior Publication US 2022/0048813 A1, Feb. 17, 2022
Int. Cl. C03C 15/00 (2006.01); B32B 17/10 (2006.01); C03C 21/00 (2006.01); C03C 23/00 (2006.01); H05K 1/02 (2006.01); H05K 1/03 (2006.01); H05K 1/11 (2006.01)

CPC C03C 21/002 (2013.01) [B32B 17/10 (2013.01); C03C 15/00 (2013.01); C03C 23/0025 (2013.01); H05K 1/028 (2013.01); H05K 1/0393 (2013.01); H05K 1/118 (2013.01); B32B 2457/20 (2013.01)]

14 Claims

1. A method of manufacturing a cover window for a display device, the method comprising:

providing a glass substrate comprising a bendable area and a flat area;

modifying the bendable area by irradiating the glass substrate with a beam; and

etching the bendable area to have a thinner thickness than the flat area,

wherein the beam is a line beam having an intensity that decreases continuously in a Gaussian distribution from a center of the bendable area toward a boundary between the bendable area and the flat area, the line beam has a width set to correspond to a width of the bendable area,

wherein the etching forms a groove in the bendable area and a gradual transition between the groove and the flat area, and

wherein the irradiating the glass substrate with the beam comprises directing the beam through a plurality of mirrors and a plurality of lenses between two adjacent mirrors of the plurality of mirrors.