Holographic head-up display apparatus
First Claim
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1. A holographic head-up display apparatus which comprises:
- (a) light emitting display means for generating visible display light;
(b) transmissive hologram diffraction grating means for transmissively diffracting the visible display light emitted from said light emitting display means;
(c) reflective hologram diffraction grating means for reflectively diffracting the visible display light transmissively diffracted through said transmissive hologram diffraction grating means toward an observer so that the observer can recognize a clear virtual image free from chromatic aberration of the visible display light emitted from said light emitting display means.
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Abstract
In a head-up display such that display images of instruments within a dashboard can be projected upon part of a windshield of an automotive vehicle, the holographic head-up display apparatus comprises a light emitting display unit; a transmissive hologram plate; and a reflective hologram plate. Since visible display images can be seen by the driver after having been passed through the transmissive hologram plate and reflected from the reflective hologram plate, blur of the display image due to chromatic aberration can be cancelled out, thus providing clear head-up instrument images.
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Citations
7 Claims
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1. A holographic head-up display apparatus which comprises:
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(a) light emitting display means for generating visible display light; (b) transmissive hologram diffraction grating means for transmissively diffracting the visible display light emitted from said light emitting display means; (c) reflective hologram diffraction grating means for reflectively diffracting the visible display light transmissively diffracted through said transmissive hologram diffraction grating means toward an observer so that the observer can recognize a clear virtual image free from chromatic aberration of the visible display light emitted from said light emitting display means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification