DIFFRACTIVE COMBINER FOR A COLOR HEAD-UP DISPLAY (HUD) DEVICE

摘要

The invention relates to a diffractive combiner (10) for a color head-up display (HUD) device (18), wherein said diffractive combiner includes a first optical diffraction grating (14) adapted for diffracting, in a diffraction direction, light having a first wavelength and which is incident on the first grating in an incidence direction, a second optical diffraction grating (16) adapted for diffracting, in the same direction, light having a second wavelength and which is incident on the second grating in the incidence direction. The first and second optical diffraction gratings are formed in relief on first and second opposite surfaces of the combiner. The first and/or second grating is made as a wavelength multiplex optical diffraction grating and is adapted for diffracting in the diffraction direction light at a third wavelength impacting the first and/or second optical diffraction grating in the incidence direction.