Display screen with optical memory
First Claim
Patent Images
1. A projection screen on which an image can be displayed by receiving a projection light, the screen comprising a plurality of pixels, each of the plurality of pixels comprising at least two pixel portions, each pixel portion comprising:
- a programmable wavelength selective layer having a photochromic material and a multi-peak transmission filter layer;
wherein the programmable wavelength selective layer has a state that can be modified by programming light of specific wavelengths associated with that pixel portion, and wherein the multi-peak transmission filter layer transmits to the programmable wavelength selective layer those specific wavelengths of programming light associated with that pixel portion and rejects those other wavelengths of programming light associated with other pixel portions of said each of the plurality of pixels;
whereby each pixel portion modulates a different predetermined wavelength of projection light, said wavelength being associated with that pixel portion.
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Abstract
The invention is a multi-color display screen that has built in optical memory for each pixel location. The optical memory is optically read and optically programmed. The screen itself distinguishes between the specific colors from which a full-color (or multi-color) image is constructed and modulates the intensities of the component colors that it directs toward a viewer. The screen provides enhanced image resolution and reduces information bandwidth required to control the display the image.
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24 Claims
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1. A projection screen on which an image can be displayed by receiving a projection light, the screen comprising a plurality of pixels, each of the plurality of pixels comprising at least two pixel portions, each pixel portion comprising:
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a programmable wavelength selective layer having a photochromic material and a multi-peak transmission filter layer; wherein the programmable wavelength selective layer has a state that can be modified by programming light of specific wavelengths associated with that pixel portion, and wherein the multi-peak transmission filter layer transmits to the programmable wavelength selective layer those specific wavelengths of programming light associated with that pixel portion and rejects those other wavelengths of programming light associated with other pixel portions of said each of the plurality of pixels; whereby each pixel portion modulates a different predetermined wavelength of projection light, said wavelength being associated with that pixel portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of displaying an image on a projection screen comprising the steps of:
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programming the state of each pixel of the projection screen by temporarily illuminating that pixel with programming light; and illuminating each pixel of the projection screen with projection light of at least two wavelengths; wherein said each pixel comprises at least two pixel portions, each one of said at least two pixel portions having a programmable state that modulates a particular wavelength of said projection light associated with that pixel portion and that does not modulate other wavelengths of said projection light not associated with that pixel portion; and wherein each pixel is capable of retaining its state when said pixel is not being illuminated with said programming light. - View Dependent Claims (21, 22, 23, 24)
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Specification