US 11,917,121 B2
Optical method and system for light field (LF) displays based on tunable liquid crystal (LC) diffusers
Jukka-Tapani Makinen, Oulu (FI)
Assigned to InterDigital Madison Patent Holdings, SAS, Paris (FR)
Appl. No. 17/622,564
Filed by InterDigital Madison Patent Holdings, SAS, Paris (FR)
PCT Filed Jun. 24, 2020, PCT No. PCT/US2020/039334
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2020/263958, PCT Pub. Date Dec. 30, 2020.
Claims priority of provisional application 62/868,687, filed on Jun. 28, 2019.
Prior Publication US 2022/0264076 A1, Aug. 18, 2022
Int. Cl. H04N 13/307 (2018.01); G02F 1/1335 (2006.01); H04N 13/315 (2018.01)
CPC H04N 13/307 (2018.05) [G02F 1/133538 (2021.01); H04N 13/315 (2018.05)] 14 Claims
OG exemplary drawing
 
1. An apparatus of light field display comprising:
a first layer comprising an electrically adjustable liquid crystal capable of altering a polarization state of light passing through the first layer depending upon the state of electrical adjustment; and
a second layer, parallel to the first layer, comprising a birefringent material having an optical interface to a substrate with surface features, wherein a refractive index difference associated with the optical interface depends on the polarization state of an incident light,
wherein the second layer is configured to scatter, according to a first angular pattern, light passing through the second layer when the polarization state of the light is in a first polarization state corresponding to a first refractive index difference associated with the optical interface, and
wherein the second layer is configured to scatter, according to a second angular pattern, light passing through the second layer when the polarization state of the light is in a second polarization state corresponding to a second refractive index difference associated with the optical interface.