US 12,292,644 B2
Display device and photomask therefor
Alexander Cole, Milton Keynes (GB); and Neil Collings, Milton Keynes (GB)
Assigned to Envisics Ltd., Milton Keynes (GB)
Filed by Envisics Ltd, Milton Keynes (GB)
Filed on Jun. 23, 2022, as Appl. No. 17/847,453.
Claims priority of application No. 2109865 (GB), filed on Jul. 8, 2021.
Prior Publication US 2023/0011653 A1, Jan. 12, 2023
Int. Cl. G02F 1/1335 (2006.01); G02B 27/01 (2006.01); G02F 1/1362 (2006.01); G03H 1/00 (2006.01)
CPC G02F 1/133516 (2013.01) [G02B 27/0103 (2013.01); G02F 1/133504 (2013.01); G02F 1/133512 (2013.01); G02F 1/136277 (2013.01); G02F 2201/305 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A display device configured to spatially modulate light having a first characteristic, wherein the display device comprises a Liquid Crystal on Silicon Spatial Light Modulator (LCOS SLM), and wherein the display device comprises:
a plurality of pixels on a substrate, the plurality of pixels having a pixel area; and
a pixel mask structure comprising a diffractive pattern that is configured to diffract light having the first characteristic and to transmit light having a second characteristic, wherein the pixel mask structure substantially surrounds the pixel area of the plurality of pixels to form a central aperture for light which does not contain a diffractive pattern, and wherein the first characteristic is a first wavelength or range of wavelengths of light and the second characteristic is a second wavelength or range of wavelengths of light.