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Image projecting device and method

  • US 20060018025A1
  • Filed: 07/08/2005
  • Published: 01/26/2006
  • Est. Priority Date: 01/08/2003
  • Status: Active Grant
First Claim
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1. An image projecting device comprising a light source system, a spatial light modulator (SLM) unit, and an image projection optics accommodated at the output side of the SLM unit, the device being characterized in at least one of the following:

  • (i) said SLM unit includes a pixel array arrangement in the form of a multi-layer structure defining a pixel array assembly and at least one microlens assembly enclosed between two substrates, the microlens assembly including at least one microlens array accommodated proximate of the pixel array assembly at least upstream thereof with respect to a direction of propagation of light from the light source system towards the SLM unit, and operating to condense and focus incident light onto the pixel array;

    (ii) said SLM unit including a pixel array assembly and a microlens assembly, the microlens assembly having first and second microlens arrays accommodated in a spaced-apart parallel relationship at least upstream of the pixel array assembly with respect to a direction of propagation of light from the light source system towards the SLM unit, the lenses of said second array located closer to the pixel array assembly being smaller or having different focal length than those of the first array, the lenslet assembly thereby condensing and focusing the incident light to impinge in form of a plurality of parallel light components onto a plurality of pixels, respectively;

    (iii) the light source system comprises n light sources and a light converting means in optical path of light generated by the n light sources to thereby produce m light beams of different wavelength ranges, wherein m>

    n;

    (iv) the light source system comprises a multi-mode laser, thereby reducing a speckle effect in an integrated speckle pattern produced by the multiple modes, as compared to that of a single mode;

    (v) the light source system comprises at least one highly polarized light source and a randomly polarized light source.

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