Touch-sensitive overlay

Details Touch-sensitive overlay Touch-sensitive overlay

1982-12-13

1986-01-28

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340706, 340365P, 340711, 178 18, G09G 100

Patent

active

045674809

ABSTRACT:
A touch-sensitive overlay (20) for cooperative, optically proximate engagement with a visual display (22) of luminous character information (38) latently occupying one or more of a plurality of character locations (26) defined with a position-multiplexed coordinate array one from another, is comprised of a mask (44) of a photoreactive transducer (52) having at least one photoelectric parameter which varies as a function of incident light from the display of character information striking the transducer, and a signal circuit element (92) responsive to a variation in the photoelectric parameter in communication with the mask for developing a characteristic logic pulse indicative of the position of one or more character locations within the array upon a touch thereof and the coincident presence of character information thereat (48). In a highly preferred implementation, the visual display is a CRT display where the raster scan (24) and associated driving circuitry (96) provides the position-multiplexing of character locations and selective illumination thereof, while the photoreactive transducer is an open photovoltaic cell for developing a localized electric potential at luminous character locations, completed upon a manual touch by the operator at a selected location to develop an output voltage pulse indicative of the position(s) touched, which pulse is then employed to interrogate registers (98) associated with the raster scan circuitry in order to provide spatial determination of the location(s) corresponding to the coincident presence of a touch and luminous character information thereat.

REFERENCES:
patent: 3737668 (1973-06-01), Ellis et al.
patent: 4177354 (1979-12-01), Mathews
patent: 4305071 (1981-12-01), Bell et al.
patent: 4396977 (1983-08-01), Slater et al.
patent: 4484179 (1984-11-01), Kasday
IBM Technical Disclosure Bulletin, vol. 24, No. 6, Nov. 81, "Optical Overlay Input Device for a Cathode Ray Tube", Harris, pp. 2732-2733.
IBM Technical Disclosure Bulletin, vol. 26, No. 6, Nov. 83, "Optical Keyboard Device and Technique", Callens, pp. 2763-2764.

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