Head-up display device

A car head-up display device, comprising:

• an image generator;
• a beam combiner having a hologram formed on a front glass, said hologram reflectively diffracting a light emitted from said image generator along an emitting direction toward an observer and being tilted laterally with respect to the emitting direction and disposed in a viewing plane not perpendicular to the emitting direction;
• and
• a compensator having a diffraction grating for reflectively diffracting the light from said image generator and directing the light to said beam combiner to correct a chromatic aberration generated by said hologram,
• said compensator being arranged such that a second axis perpendicular to a center of said diffraction grating and a first axis perpendicular to a center of said hologram are substantially in a common plane.

A head-up display device, comprising:

• an image generator;
• a beam combiner having a first light receiving surface for receiving light from said image generator and diffracting the light in an emitting direction toward an observer, wherein said beam combiner is tilted laterally with respect to the emitting direction and extends in a viewing plane not perpendicular to the emitting direction;
• and
• a relay system having a second light receiving surface for receiving the light generated by said image generator and directing the light to the first light receiving surface of said beam combiner,
• said relay system being arranged such that a second axis perpendicular to a center of the second light receiving surface and a first perpendicular to a center of the first light receiving surface of said beam combiner are substantially in a common plane.

A display device comprising:

• an image generator;
• a beam combiner having a first light receiving surface which receives light from said generator and diffracts the light;
• and
• a compensator having a second light receiving surface for receiving light from said generator and directing it to said first light receiving surface to correct an aberration generated by said combiner,
• wherein a plane defined by an optical axis of the light incident on said combiner and an optical axis of the light diffracted and emerged from said combiner is tilted with respect to a vertical direction.