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US 5,138,441 AGranted
Beam-index-type color display apparatus
AssigneePioneer Electronic Corporation
InventorSatoru Tanaka
Life of this patent
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Abstract
A beam-index-type color display apparatus includes an A/O modulator for emitting a first-order beam for use as an image projecting light beam and a zero-order beam for use as an index beam. The color display apparatus is light-weight and may have a large screen. An index signal can reliably be produced even if the screen is treated for a higher screen gain.
Claims3
A beam-index-type color display apparatus comprising:
- a screen composed of a plurality of fluorescent stripes of three primaries which are sensitive to a light beam, said fluorescent stripes being arranged with a regular pitch in a horizontal scanning direction;
- an array of light detectors arranged with a given pitch in the horizontal scanning direction and disposed on respective longitudinal ends of said fluorescent stripes;
- light modulating means for modulating the intensity of an applied light beam with a modulating signal in synchronism with the horizontal scanning timing of the light beam which is produced from a detected output of said light detectors;
- first scanning means for scanning said screen in the horizontal and vertical scanning directions with a first-order beam emitted from said light modulating means as an image projecting beam;
- and
- second scanning means for scanning said light detectors along the array thereof with a zero-order beam emitted from said light modulating means in synchronism with the scanning of said screen with said first-order beam in the horizontal scanning direction as an index beam.
3 more elements
Dependencies are inferred from the claim text.