US 12,248,218 B2
Photo-alignable positive c-plate retarder
David Pires, Giebenach (CH); and Richard Frantz, Village-Neuf (FR)
Assigned to ROLIC TECHNOLOGIES AG, Allschwil (CH)
Appl. No. 17/597,446
Filed by ROLIC TECHNOLOGIES AG, Allschwil (CH)
PCT Filed Jul. 20, 2020, PCT No. PCT/EP2020/070414
§ 371(c)(1), (2) Date Jan. 6, 2022,
PCT Pub. No. WO2021/013780, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 19188062 (EP), filed on Jul. 24, 2019.
Prior Publication US 2022/0163853 A1, May 26, 2022
Int. Cl. G02F 1/13363 (2006.01); G02F 1/1337 (2006.01)
CPC G02F 1/133634 (2013.01) [G02F 1/133788 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of manufacturing an optical element (1, 2) including a photo-aligned positive c-plate retarder layer comprising the steps of
providing a PAPC material composition comprising homeotropically alignable, polymerizable liquid crystals and a photo-orientable substance
forming on a support (11) a layer (12) of the PAPC material, wherein the liquid crystal molecules are homeotropically oriented
initiating polymerization of the polymerizable liquid crystals in the PAPC layer
exposing the PAPC layer (12) to aligning light to generate alignment on the upper surface of the layer for a slave material, wherein the generated alignment direction at least in one area of the upper surface is planar or tilted with regard to the PAPC layer surface.