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| Optical transmission and receiving module |
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Optics arrangements including light source arrangements for an active matrix liquid crystal image generator
| Details |
Inventors: Handschy, Mark A.; Meadows, Michael R.; Chase, Holden;
Assignee: Displaytech, Inc. (Boulder, CO)
Primary Examiner: Epps; Georgia Y.
Assistant Examiner: Bey; Dawn-Marie
Attorney, Agent or Firm: Shear; Stephen C., Beyer; Jay
A system for producing modulated light is disclosed. The system comprises a spatial light modulator including a light modulating medium switchable between different states so as to act on light in ways which form overall patterns of modulated light. The system also includes an arrangement for switching the modulating medium between the different states in a controlled way and an illumination arrangement for producing a source of light. The system further includes an optics arrangement for directing light from the source of light into the spatial light modulator and for directing light from the spatial light modulator through a predetermined source imaging area. The optics arrangement cooperates with the illumination arrangement and the spatial light modulator so as to produce a real image of the source of light within the source imaging area such that an individual is able to view a virtual image of the overall patterns of modulated light from the source imaging area. A variety of novel optics arrangements are disclosed including specific combinations of different light sources, diffusing plates, polarizers, beam splitters, analyzers, lenses, mirrors, and holographic optical elements which allow the overall optical arrangement to be miniaturized to the same degree and in coordination with the spatial light modulator. The different light sources include using a plurality of light sources, such as LEDs, to form an array of light sources, each of the light sources providing light to a corresponding portion of the spatial light modulator. |
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DETAILED DESCRIPTION As will be described in more detail hereinafter, a system for producing modulated light is disclosed.
The system comprises a spatial light modulator including a light modulating medium switchable between different states so as to act on light in ways which form overall patterns of modulated light.
The system also includes means for switching the modulating medium between the different states in a controlled way and illumination means for producing a source of light.
The system further includes optics means for directing light from the source of light into the spatial light modulator and for directing light from the spatial light modulator through a predetermined source imaging area.
The optics means cooperates with the illumination means and the spatial light modulator so as to produce a real image of the source of light within the source imaging area such that an individual is able to view a virtual image of the overall patterns of modulated light from the source imaging area.
In one preferred embodiment of the present invention the spatial light modulator is a reflective type spatial light modulator and the optics means cooperate with said illumination means and said spatial light modulator such that some of the light passing from the illumination means to the spatial light modulator overlaps with some of the light passing from the spatial light modulator to the source imaging area.
In another embodiment of the present invention, the light source is provided by means of an array of light emitting sources such as LEDs (light emitting diodes) spaced apart by a predetermined distance.
These spaced apart light sources, in combination with the optical components, produce an equal plurality of images at the source imaging area which are spaced apart from one another by a predetermined distance.
The optical components of this embodiment may include a single collimating lens disposed optically between the light sources and the spatial light modulator, or alternatively, may include a plurality of collimating lenses, each of which is disposed optically between an associated one of the light sources and the spatial light modulator so as to direct light from its associated light source to a corresponding portion of the spatial light modulator
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Optical Systems 
