Patent ID: 9395539
Filing Date: 2016-07-19
CPC Classification: G02B

Claim Text:
1. A head-up display (HUD) system comprising: an imaging subsystem comprising a viewing screen having a surface, a liquid crystal display (LCD) and a lens positioned between the LCD and the viewing screen, the imaging system being characterized in that if light of a first uniformity were propagated through the LCD and lens to the viewing screen, an uncompensated image would be displayed to a user via uncompensated image light propagating from the imaging subsystem to the user, the image light having a first portion with a first value of a radiant property and a second portion with a second value of the radiant property, a difference between the first and second values being a first amount; and a light source configured to emit source light of a second, predetermined uniformity through the imaging system such that when the source light is propagated through the imaging subsystem, a compensated image is displayed to the user via compensated image light, the first portion of the compensated image light having a third value of the radiant property, and the second portion of the image light having a fourth value of the radiant property, a difference between the third and fourth values being a second amount, the second amount being less than the first amount, wherein the image light propagates from the viewing screen to the user such that the images are displayed to the user on the viewing screen and the first portion of the image light propagates from a first portion of the surface of the viewing screen at a first angle of incidence, and the second portion of the image light propagates from a second portion of the surface of the viewing screen at a second angle of incidence, and the difference between the first uniformity and the second, predetermined uniformity includes differences an optical frequency uniformity and an emission angle uniformity.