US 11,988,922 B2
Nanostructure based display devices with improved light extraction efficiency
Ernest C. Lee, Palo Alto, CA (US); David Olmeijer, San Francisco, CA (US); Charles Hotz, San Rafael, CA (US); Ruiqing Ma, Morristown, NJ (US); and Jason Hartlove, Los Altos, CA (US)
Assigned to SHOEI CHEMICAL INC., Tokyo (JP)
Appl. No. 17/609,205
Filed by Shoei Chemical Inc., Tokyo (JP)
PCT Filed May 7, 2020, PCT No. PCT/US2020/031856
§ 371(c)(1), (2) Date Nov. 5, 2021,
PCT Pub. No. WO2020/227518, PCT Pub. Date Nov. 12, 2020.
Claims priority of provisional application 62/845,224, filed on May 8, 2019.
Prior Publication US 2022/0206341 A1, Jun. 30, 2022
Int. Cl. G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133614 (2021.01) [G02F 1/133512 (2013.01); G02F 1/133603 (2013.01); G02F 1/133528 (2013.01); G02F 2202/36 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A display device comprising:
a backlight unit comprising a light source; and
a liquid crystal display (LCD) module comprising:
a nanostructure-based color conversion (NS-based CC) layer configured to receive a primary light from the light source, having a first peak wavelength and to convert a portion of the primary light to emit a first portion of a secondary light having a second peak wavelength that is different from the first peak wavelength; and
a light extraction layer, optically coupled to the NS-based CC layer, configured to prevent total internal reflection of a second portion of the secondary light, wherein the light extraction layer comprises an optically transparent substrate and patterned features with one or more dimension in nanometer scale disposed on the optically transparent substrate, wherein the patterned features are arranged in a repeating pattern or a random pattern on the optically transparent substrate, wherein the optically transparent substrate is disposed between the NS-based CC layer and the patterned features, and wherein top surfaces of the patterned features face away from a top surface of the NS-based CC layer.