Touch screen input system

Details Touch screen input system Touch screen input system

1986-01-03

1988-03-22

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

250221, 340718, G08C 2100

Patent

active

047330228

ABSTRACT:
A touch screen input system for use with a display screen having a photo-active display surface including a controllable sweeping beam. The system includes at least one photo-detector in combination with detection circuitry for continuously registering the position of the beam in the display surface. A pointer is adapted to reflect light from the beam to the photo-detector to provide a latch signal which is used to hold a signal identifying display screen location corresponding to pointer means location.

REFERENCES:
patent: 3394366 (1968-07-01), Dye
patent: 3613066 (1971-10-01), Cooreman
patent: 4277783 (1981-07-01), Sampieri et al.
patent: 4305071 (1981-12-01), Bell et al.
patent: 4346376 (1982-08-01), Mallow
patent: 4484179 (1984-11-01), Kasday
patent: 4517559 (1985-05-01), Deitch et al.
patent: 4542375 (1985-09-01), Alles et al.
patent: 4613987 (1986-09-01), Keverian

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