Input device

Details Input device Input device

1994-08-08

2000-07-18

Mengistu, Amare

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

178 1809, G09G 500

Patent

active

06091405&

ABSTRACT:
An input device for a visual display comprising a light source and a scanner for angularly scanning a light beam from the light source across a plane. A photodetector detects interruption of the beam by an article positioned in the plane. The scanner comprises a shutter having a linear array of addressable, electrically actuable shutter elements. Each element is operable to transmit or block light from the light source under the control of a corresponding electrical signal. Because the light beam is scanned by a shutter rather than a mechanical scanner, the device is advantageously more reliable than conventional electromechanical optical input devices.

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patent: 3925666 (1975-12-01), Allan et al.
patent: 3944818 (1976-03-01), Bechtel
patent: 4558313 (1985-12-01), Garwin et al.
patent: 4708473 (1987-11-01), Metzdorff et al.
patent: 5001557 (1991-03-01), Begle
patent: 5159187 (1992-10-01), Okisu et al.
patent: 5173793 (1992-12-01), Purcell

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