US 11,988,830 B2
Head up display
Shih-Yi Lin, Hsin-Chu (TW); and Yu-An Huang, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Jun. 13, 2022, as Appl. No. 17/838,274.
Claims priority of provisional application 63/222,452, filed on Jul. 16, 2021.
Claims priority of application No. 202111346454.0 (CN), filed on Nov. 15, 2021.
Prior Publication US 2023/0025573 A1, Jan. 26, 2023
Int. Cl. G02B 27/01 (2006.01); G02F 1/1335 (2006.01)
CPC G02B 27/0101 (2013.01) [G02B 27/0149 (2013.01); G02F 1/133528 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A head up display, comprising:
an image-light source, configured to provide an image light;
at least one reflector, configured to transmit the image light to leave the head up display; and
a light modulation device, disposed in the head up display, and disposed on a transmission path of the image light,
wherein the light modulation device is configured to reduce a light energy of an ambient light after the ambient light passes through the light modulation device, and wherein the image-light source is disposed on a transmission path of the ambient light such that the ambient light enters the image-light source after the ambient light passes through the light modulation device,
wherein a polarization state of the ambient light during transmitting through the light modulation device comprises a linear polarization state and a non-polarized state.