Projection display systems utilizing color scrolling and light emitting diodes
First Claim
1. A projection display system, comprising:
- a light-recycling illumination system, further comprising;
a light source for generating light, wherein said light source is at least one light-emitting diode having a reflecting layer, wherein the total light-emitting area of said light source is area AS and wherein said light source has a maximum intrinsic source luminance;
a light-recycling envelope, wherein said light-recycling envelope encloses said light source and wherein said light-recycling envelope reflects and recycles a portion of said light generated by said light source back to said reflecting layer;
a light output aperture, wherein said light output aperture is located in a surface of said light-recycling envelope, wherein the area of said light output aperture is area AO, wherein said area AO is less than said area AS, wherein said light source and said light-recycling envelope direct at least a fraction of said light out of said light-recycling envelope through said light output aperture and wherein said fraction of said light exits said light output aperture as uncollimated light having a maximum exiting luminance;
a light-collimating means, wherein said light-collimating means has an input surface that is adjacent to said light output aperture that accepts said uncollimated light, wherein said light-collimating means partially collimates said uncollimated light and wherein said light-collimating means has an output surface through which the partially collimated light is transmitted;
a color scrolling means to scan said partially collimated light, wherein said color scrolling means is located in the light optical path of said partially collimated light exiting said light-collimating means; and
an imaging light modulator, wherein said imaging light modulator is located in said light optical path in a position following said color scrolling means, and wherein said imaging light modulator spatially modulates the scanned said partially collimated light to form an image that is projected onto a viewing screen.
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Abstract
A projection display system has at least one light-recycling illumination system, a color scroller and an imaging light modulator. The light-recycling illumination system includes a light source that is enclosed within a light-recycling envelope. The light source is a light-emitting diode that emits light, and a fraction of that light will exit the light-recycling envelope through an aperture. The light-recycling envelope recycles a portion of the light emitted by the light source back to the light source in order to enhance the luminance of the light exiting the aperture. The fraction of the light that exits the aperture is partially collimated and is directed to a color scrolling means. The color scroller scans the partially collimated light across the face of the imaging light modulator. The imaging light modulator spatially modulates the scrolled beam of light to form an image.
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Citations
14 Claims
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1. A projection display system, comprising:
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a light-recycling illumination system, further comprising; a light source for generating light, wherein said light source is at least one light-emitting diode having a reflecting layer, wherein the total light-emitting area of said light source is area AS and wherein said light source has a maximum intrinsic source luminance; a light-recycling envelope, wherein said light-recycling envelope encloses said light source and wherein said light-recycling envelope reflects and recycles a portion of said light generated by said light source back to said reflecting layer; a light output aperture, wherein said light output aperture is located in a surface of said light-recycling envelope, wherein the area of said light output aperture is area AO, wherein said area AO is less than said area AS, wherein said light source and said light-recycling envelope direct at least a fraction of said light out of said light-recycling envelope through said light output aperture and wherein said fraction of said light exits said light output aperture as uncollimated light having a maximum exiting luminance; a light-collimating means, wherein said light-collimating means has an input surface that is adjacent to said light output aperture that accepts said uncollimated light, wherein said light-collimating means partially collimates said uncollimated light and wherein said light-collimating means has an output surface through which the partially collimated light is transmitted; a color scrolling means to scan said partially collimated light, wherein said color scrolling means is located in the light optical path of said partially collimated light exiting said light-collimating means; and an imaging light modulator, wherein said imaging light modulator is located in said light optical path in a position following said color scrolling means, and wherein said imaging light modulator spatially modulates the scanned said partially collimated light to form an image that is projected onto a viewing screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification