Illumination system for color displays
First Claim
Patent Images
1. A transmissive active matrix liquid crystal display device comprising:
- an active matrix array of transistor circuits and pixel electrodes over an insulating layer, each pixel electrode being electrically connected to a transistor circuit that actuates the pixel electrode;
an optically transmissive substrate bonded to the active matrix array with an adhesive layer on a first side of the insulating layer;
a layer of liquid crystal material positioned between a second side of the insulating layer and a counterelectrode to form a transmissive display structure such that actuation of the pixel electrodes controls transmission of light through a volume of the liquid crystal material;
a diffractive optical element aligned with the active matrix array to disperse light of different colors through different volumes of the liquid crystal material; and
a housing that contains the transmissive display structure and the diffractive optical element.
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Abstract
Binary optics are used in an illumination system for a color projection display. In one embodiment a broad spectrum light source illuminates a multilevel optical phase element which disperses the broad spectrum light from the light source by diffraction. A display having a number of pixel elements, each capable of transmitting a predetermined spectral region, is positioned within the near field region of the multilevel optical phase element so as to receive the light dispersed by the multilevel phase element.
234 Citations
28 Claims
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1. A transmissive active matrix liquid crystal display device comprising:
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an active matrix array of transistor circuits and pixel electrodes over an insulating layer, each pixel electrode being electrically connected to a transistor circuit that actuates the pixel electrode; an optically transmissive substrate bonded to the active matrix array with an adhesive layer on a first side of the insulating layer; a layer of liquid crystal material positioned between a second side of the insulating layer and a counterelectrode to form a transmissive display structure such that actuation of the pixel electrodes controls transmission of light through a volume of the liquid crystal material; a diffractive optical element aligned with the active matrix array to disperse light of different colors through different volumes of the liquid crystal material; and a housing that contains the transmissive display structure and the diffractive optical element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A reflective display device comprising:
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an array of light reflective pixels; a diffractive optical element aligned with the array of pixels to disperse light of different colors onto different pixels; an optical system that couples light from the diffractive optical element onto the reflective pixels; and a housing that contains the array of light reflective pixels and the diffractive optical element. - View Dependent Claims (14, 15, 16)
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17. A method of fabricating a transmissive active matrix liquid crystal display device comprising the steps of:
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providing an active matrix array of transistor circuits and pixel electrodes on an insulating layer, each pixel electrode being electrically connected to a transistor circuit that actuates the pixel electrode; bonding an optically transmissive substrate to the active matrix array with an adhesive layer; forming a transmissive display structure by positioning a layer of liquid crystal material between the insulating layer and a counterelectrode such that actuation of the pixel electrodes controls transmission of light through a respective volume of the liquid crystal material; aligning a diffractive optical element with the active matrix array to disperse light of different colors through different volumes of the liquid crystal material; and enclosing the transmissive display structure and the diffractive optical element within a housing. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification