Field sequential color illumination system for liquid crystal display
First Claim
1. A device for displaying an image by sequential, multi-monochromatic color illumination, comprising:
- an illuminator including a plurality of different monochromatic light sources for producing a plurality of different monochromatic colors of light;
an array of light valves located in front of the illuminator and in optical alignment therewith;
an electronic controller connected to the illuminator for setting each of the plurality of different monochromatic light sources in one of an on and an off state and for spatially and temporally multiplexing the plurality of different monochromatic colors;
a lens sheet disposed between the illuminator and the array of light valves for imaging the plurality of different monochromatic light sources in a plane adjacent the light valve array in which at least a portion of each of the light valves is illuminated by any one of the plurality of different monochromatic colors during a first illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, further wherein a different portion of each of the light valves is illuminated by a different one of the monochromatic colors during a second sequential illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, and still further wherein another different portion of each of the light valves is illuminated by another different one of the monochromatic colors during a third sequential illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources,whereby after the third illumination period each light valve has been illuminated by all of the different monochromatic colors.
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Accused Products
Abstract
A field sequential color illumination system for liquid crystal displays is described which focuses light from a plurality of small point like or line like light sources into subregions of pixels of an LCD by a fly'"'"'s eye lens, in such a manner that at any given time, red, blue, and green light spots are focused simultaneously into different pixels. Furthermore, during each subsequent field, light spots are focused into different sub sections of each pixel in such a way that each pixel receives red, green, and blue illumination sequentially during each set of three fields. During each field, each pixel is addressed and made to display the appropriate transmittance level to display the appropriate red, green, or blue color level for its location on the red, blue, or green color component of the image just prior to illumination of a sub region by a red, green, or blue light source.
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Citations
25 Claims
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1. A device for displaying an image by sequential, multi-monochromatic color illumination, comprising:
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an illuminator including a plurality of different monochromatic light sources for producing a plurality of different monochromatic colors of light; an array of light valves located in front of the illuminator and in optical alignment therewith; an electronic controller connected to the illuminator for setting each of the plurality of different monochromatic light sources in one of an on and an off state and for spatially and temporally multiplexing the plurality of different monochromatic colors; a lens sheet disposed between the illuminator and the array of light valves for imaging the plurality of different monochromatic light sources in a plane adjacent the light valve array in which at least a portion of each of the light valves is illuminated by any one of the plurality of different monochromatic colors during a first illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, further wherein a different portion of each of the light valves is illuminated by a different one of the monochromatic colors during a second sequential illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, and still further wherein another different portion of each of the light valves is illuminated by another different one of the monochromatic colors during a third sequential illumination period in which all of the colors are displayed by the plurality of different monochromatic light sources, whereby after the third illumination period each light valve has been illuminated by all of the different monochromatic colors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for field sequential color illumination of an image, comprising the steps of:
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addressing each of a plurality of individually addressable light valves having adjustable transparency in a first time period to each display pan of a monochromatic color component of the image wherein said each monochromatic component includes any one of a plurality of monochromatic components, and illuminating each of said plurality of light valves during a first illumination period with one of a plurality of monochromatic colors of light so that at least a portion of each light valve is illuminated with the monochromatic color corresponding to the color component displayed by each said light valve during the first time period wherein all of the monochromatic colors are on for different light valves during said first illumination period; addressing each of the plurality of light valves in a second sequential time period to each display a different part of the monochromatic color component of the image, and illuminating each of said plurality of light valves during a second sequential illumination period with another one of the plurality of monochromatic colors of light so that at least a portion of each light valve is illuminated with the monochromatic color corresponding to the color component displayed by each said light valve during the second time period wherein all of the monochromatic colors are on for different light valves during said second illumination period; and addressing each of the plurality of light valves in a third sequential time period to each display another different part of the monochromatic color component of the image, and illuminating each of said plurality of light valves during a third sequential illumination period with another one of the plurality of monochromatic colors of light so that at least a portion of each light valve is illuminated with the monochromatic color corresponding to the color component displayed by each said light valve during the third time period wherein all of the monochromatic colors are on for different light valves during said third illumination period, whereby after a cycle of the first, second and third illumination periods all portions of all of the light valves have been illuminated by all of the different monochromatic colors of light. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A method for field sequential color illumination for displaying an image, comprising the step of:
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spatially and temporally interlacing a plurality of different monochromatic colors of light on an array of light valves in which each light valve is addressable to display one of a plurality of monochromatic color components of the image wherein the step further comprises addressing each light valve in a first time period to display a first monochromatic color component of the image wherein said first monochromatic component includes one of the plurality of monochromatic components, and illuminating each light valve during a first illumination period with one of the plurality of monochromatic colors of light so that at least a portion of each light valve is illuminated with the monochromatic color corresponding to the color component displayed by each said light valve during the first time period wherein all of the monochromatic colors are on for different light valves during said first illumination period; addressing each light valve in a second sequential time period to display a different part of the monochromatic color component of the image, and illuminating each light valve during a second sequential illumination period with another one of the plurality of monochromatic colors of light so that a different portion of each light valve is illuminated with the monochromatic color corresponding to the color component displayed by each light valve during the second time period wherein all of the monochromatic colors are on for different light valves during said second illumination period; and addressing each light valve in a third sequential time period to display another different part of the monochromatic color component of the image, and illuminating each light valve during a third sequential illumination period with another one of the plurality of monochromatic colors of light so that another different portion of each light valve is illuminated with the monochromatic color corresponding to the color component displayed by each said light valve during the third time period wherein all of the monochromatic colors are on for the different light valves during said third illumination period, whereby after a cycle of the first, second and third illumination periods all portions of all of the light valves have been illuminated by all of the different monochromatic colors of light.
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Specification