Patent ID: 9400386
Filing Date: 2016-07-26
CPC Classification: G02B

Claim Text:
1. A head-up display, comprising: an image-generating device for generating an image and an optical system operatively configured for projecting the image; a lighting system configured to illuminate the image-generating device; wherein the lighting system comprises at least two different color light sources having a common light propagation path; and a light-mixing geometry disposed directly adjacent to and downstream of the at least two different color light sources and along the common light propagation path, wherein the light-mixing geometry has boundary surfaces, each of which is reflective on an inner side, and wherein the light-mixing geometry is configured to mix together and homogenize the light of the at least two different color light sources, wherein the lighting system further comprises a diffuser that is disposed downstream from and directly adjacent to the light-mixing geometry, wherein a length of the light-mixing geometry along the common light propagation path is (i) greater than a distance between the at least two different color light sources, and (ii) less than three times said distance between the at least two different color light sources.