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US 3,971,931 AGranted
Led image tube light valve
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorRobert E. Jehle
Life of this patent
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Abstract
A projection display for producing a bright image of pictorial quality from a large time bandwidth video signal produced by a plurality of light emitting diodes (LED's).
Claims8
A light projection device for transforming a dim, high resolution image into a bright, high resolution image for projection onto a screen, comprising:
- a linear array of light emitting means for producing said dim, high resolution image;
- image intensifier means for producing an intensified image from said dim, high resolution image;
- a fiber optic plate connected to said image intensifier means to transversely convey said intensified image;
- light valve means for transforming said intensified image into an electrical potential gradient and a gradient of transparency proportional to said intensified image to control the gradient of intensity of a high intensity projection light to produce said bright, high resolution image.
1 more element
A light projection device for transforming a high resolution, dim image into a high resolution, bright image, comprising:
- a source of direct current voltage having at least two terminals of opposite relative polarity;
- a vacuum tube image intensifier including a photocathode electrically coupled to a first terminal of said direct current voltage source and an electroluminescent surface electrically coupled to said a second terminal of said direct current voltage source positive relative to said first teminal, the photocathode and the electroluminescent surface being spaced to form opposed, parallel end walls, for local emission of visible image bearing radiation of intensity greater than the intensity of said dim image in response to incidence of radiation bearing said dim image upon the exterior face of the photocathode;
- a fiber optic plate having a first face and a second face, the first face being optically coupled to the exterior surface and the vacuum tube end wall formed by said electroluminescent surface;
- an alternating polarity voltage source;
- projection light means;
- a reflective liquid crystal light valve having at least two parallel transparent electrodes positioned at opposite ends and electrically coupled across said alternating polarity voltage source, one electrode being optically connected to the second face of said fiber optic plate, and a second electrode having one face exposed to said projection light means, for selectively reflecting the light of said projection light means in dependence upon the reception of said visible image bearing radiation whereby an unbroken visible representation of intensity greater than said visible image bearing radiation is projected.
3 more elements
Dependencies are inferred from the claim text.