Touch panel input apparatus

Details Touch panel input apparatus Touch panel input apparatus

1984-10-18

1987-10-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340712, 340365P, 250221, 178 18, G09G 116

Patent

active

047033169

ABSTRACT:
A touch panel input apparatus including two arrays of light detectors placed on the opposite sides of the display device screen and four light sources, each of which is placed at a corner and at angle to illuminate at least the entire array of the light detectors on the opposite side. The light detectors are scanned in synchronization with the selection of the light beam sources. A controlling microprocessor has stored in its memory four sets of data, one for each light source, regarding ambient light condition and beam interrupt thresholds for the light detectors. By software, two equations representing a line are determined and solved to obtain a cross point which corresponds to X-Y position of the finger on the screen.

REFERENCES:
patent: 3860754 (1975-01-01), Johnson et al.
patent: 4247767 (1981-01-01), O'Brien et al.
patent: 4294543 (1981-10-01), Apple et al.
patent: 4313109 (1982-01-01), Funk et al.
patent: 4346376 (1982-08-01), Mallos
patent: 4507557 (1985-03-01), Tsikas
patent: 4558313 (1985-12-01), Garwin et al.

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