US 12,449,586 B2
Display device including flexible light guide and stack layer
Kun-Hsien Lee, Hsinchu (TW); Ching-Huan Liao, Hsinchu (TW); and Hsin-Tao Huang, Hsinchu (TW)
Assigned to E Ink Holdings Inc., Hsinchu (TW)
Filed by E Ink Holdings Inc., Hsinchu (TW)
Filed on Oct. 8, 2024, as Appl. No. 18/909,854.
Application 18/909,854 is a continuation in part of application No. 18/341,767, filed on Jun. 27, 2023, granted, now 12,196,998.
Claims priority of provisional application 63/419,302, filed on Oct. 25, 2022.
Claims priority of application No. 111147549 (TW), filed on Dec. 12, 2022; and application No. 113106728 (TW), filed on Feb. 26, 2024.
Prior Publication US 2025/0028109 A1, Jan. 23, 2025
Int. Cl. F21V 8/00 (2006.01); G02F 1/1335 (2006.01)
CPC G02B 6/0088 (2013.01) [G02B 6/0033 (2013.01); G02B 6/0053 (2013.01); G02B 6/0065 (2013.01); G02B 6/0066 (2013.01); G02F 1/133616 (2021.01)] 10 Claims
OG exemplary drawing
 
1. A display device, comprising:
a display panel, having a display side and a back side opposite to the display side;
a flexible light guide, comprising a light source portion, a light entrance portion, and a middle portion between the light source portion and the light entrance portion, wherein the middle portion is bent by a bending radius of less than 1 mm so that the light source portion is disposed at the display side of the display panel, and the light entrance portion is disposed on the back side of the display panel, wherein a Young's modulus of the flexible light guide is about 10 to 1000 MPa;
a light emitting element, disposed adjacent to the light entrance portion of the flexible light guide, wherein a light emitting surface of the light emitting element faces a side edge of the flexible light guide; and
an optical layer, disposed on and in contact with a surface of the light source portion of the flexible light guide, wherein a difference of refractive index between the optical layer and the flexible light guide is in a range of 0.1 to 0.2,
wherein the optical layer exposes the light entrance portion and the middle portion of the flexible light guide.