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Optical filter employing holographic optical elements and image generating system incorporating the optical filter
| Details |
Inventors: Popovich, Milan M.; Nabors, C. David;
Assignee: SBG Labs, Inc. (Sunnyvale, CA)
Primary Examiner: Boutsikaris; Leonidas
Assistant Examiner:
Attorney, Agent or Firm: Campbell Stephenson Ascolese LLP
The present invention relates to a solid state filter used in sequentially illuminating an image display, directly or indirectly, with first, second, and third bandwidth light. The solid state filter includes at least one hologram that is switchable between active and inactive states. While in the active state, the at least one switchable hologram diffracts a first bandwidth light. In contrast, the switchable hologram transmits the first bandwidth light without substantial alteration when operating in the inactive state. In one embodiment, the diffracted first bandwidth light is used to illuminate a monochrome image presented on a display device. In another embodiment, the transmitted first bandwidth light is used to illuminate the monochrome image presented on the image display. |
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DETAILED DESCRIPTION The present invention relates to a solid state filter used in sequentially illuminating an image display, directly or indirectly, with first, second, and third bandwidth light.
The solid state filter includes at least one hologram that is switchable between active and inactive states.
While in the active state, the at least one switchable hologram diffracts a first bandwidth light.
In contrast, the switchable hologram transmits the first bandwidth light without substantial alteration when operating in the inactive state.
In one embodiment, the diffracted first bandwidth light is used to illuminate a monochrome image presented on a display device.
In another embodiment, the transmitted first bandwidth light is used to illuminate the monochrome image presented on the image display.
In one embodiment, the solid state filter may be coupled to a filter control circuit.
More particularly, the filter control circuit is coupled to the at least one switchable hologram of the solid state filter.
The control circuit is configured to selectively couple a voltage source to the at least one switchable hologram.
The at least one switchable hologram is configured to operate in the active state when decoupled from the voltage source.
In contrast, the at least one switchable hologram is configured to operate in the inactive state when coupled to the voltage source.
In another embodiment of the present invention, a solid-state filter is provided which includes a first group of first, second, and third holographic optical elements electrically switchable between active and inactive states, and a second group of first, second, and third holographic optical elements electrically switchable between active and inactive states.
Each of the holographic optical elements includes front and back oppositely facing surfaces.
Each of the first holographic optical elements diffracts first bandwidth light incident on the front surface thereof when operating in the active state.
Diffracted first bandwidth light emerges from the back surface of the first holographic optical element
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Optical Systems 
