Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1995-06-07
1998-06-09
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
341 26, 250221, G09G 500
Patent
active
057642230
ABSTRACT:
A CRT touch screen having raster-generated light patterns at the viewing screen borders of a conventional CRT. Reflective surfaces proximal to the screen borders reflect the light patterns across the CRT surface to external photodetectors. Modulating the horizontal blanking signal or employing periodic non-reflective patterns on the reflective surfaces effects raster-generated light patterns having a unique time frequency higher than the vertical synch frequency, but lower than the horizontal synch frequency. A screen pointer blocks the lights patterns reflecting across the screen to two or more of the photodetectors. The blocking is time-relative to the CRT's horizontal and vertical synch signals. The photodetector outputs are bandpass filtered at the unique pattern frequency to suppress electromagnetic interference from the CRT's horizontal raster synch, the CRT's vertical synch and other electromagnetic and optical sources. The screen pointer's position is calculated based on which photodetectors' received patterns are blocked, and the times of the blocking relative to the horizontal and vertical synch.
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Chang Ifay F.
Chen Chengjun Julian
Farnandez Stoll Kara
Hjerpe Richard
International Business Machines - Corporation
Percello Louis J.
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