| 摘要 |
The present invention relates to an optical system for use in a projection display system. The optical system, in one embodiment, includes a first electrically switchable holographic optical element (ESHOE) and a light deflector. The first ESHOE operates between active and inactive states and includes oppositely facing front and back surfaces. In the inactive state, the first ESHOE transmits first bandwidth light received on the front surface without substantial alteration. In the active state, the first ESHOE diffracts first bandwidth light received on the front surface, the diffracted first bandwidth light emerging also from the front surface. The light deflector receives first bandwidth light diffracted by the first ESHOE. In response, the light deflector deflects this diffracted first bandwidth light. The first ESHOE and the light deflector are positioned such that first bandwidth light transmitted through the inactive first ESHOE without substantial alteration can illuminate a first surface area while first bandwidth light diffracted by the active first ESHOE and subsequently deflected by the light deflector can illuminate a second non-overlapping.
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