US 12,292,649 B2
Local dimming system for head up display
Saumil Satish Wagle, Mumbai (IN); Yasuhiro Suzuki, Troy, MI (US); Arul Krishna, West Bloomfield, MI (US); and Joe Pullukat, Troy, MI (US)
Assigned to N.S. International, Ltd., Troy, MI (US)
Filed by N.S. International, Ltd., Troy, MI (US)
Filed on Jun. 28, 2023, as Appl. No. 18/215,415.
Claims priority of provisional application 63/356,271, filed on Jun. 28, 2022.
Prior Publication US 2023/0418106 A1, Dec. 28, 2023
Int. Cl. G02B 27/01 (2006.01); G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133607 (2021.01) [G02B 27/0101 (2013.01); G02F 1/133603 (2013.01); G02B 2027/0118 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A local dimming system of a head up display (HUD), the local dimming system comprising:
a light array;
a Fresnel lens array;
a lenticular lens system; and
a liquid crystal display (LCD);
wherein the Fresnel lens array is operatively connected to the light array, configured to receive light produced by the light array, and configured to produce a collimated backlight output;
wherein the lenticular lens system is operatively connected to the Fresnel lens array, configured to receive the collimated backlight-output from the Fresnel lens array, and configured to transmit light to the LCD;
wherein the LCD is configured to receive the light from the lenticular lens system and produce an image; and
wherein the Fresnel lens array is configured to reflect stray light and eliminate light bleed, thereby reducing or eliminating a display-boundary around the image.