G - Physics – 09 – G
Patent
G - Physics
09
G
340/195, 375/23
G09G 1/00 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1244162
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 vari- ation 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 there- of, 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 thence employed to interrogate registers (98) associated with the raster scan circuitry in order to provide spatial determination of the location(s) correspond- ing to the coincident presence of a touch and luminous character information thereat.
443166
3m Touch Systems Canada Limited
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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