Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1997-12-05
2000-03-07
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345164, 345166, G09G 508
Patent
active
06034671&
ABSTRACT:
A photocoupling signal detection circuit for a computer mouse to simplify the design of circuit by tracking the slope change of input voltage waveform and produce a digital output which can detect the movement of computer mouse is disclosed. This signal detection circuit includes a comparator, a state decision circuit, an up/down counter, and a D/A converter. The comparator produces an up/down signal connected to the state decision circuit, then the up/down signal connected to the up/down counter to transfer the up/down signal into a digital signal output. The digital signal connected to a D/A converter for transferring into an analog signal, and the analog signal can be compared with the output signal of an phototransistor. According to the state of up/down signal, the state decision circuit determines if the phototransistor is turned on or turned off and outputs different state signals, based on its determination. The output state signal is further utilized for the detection of a computer mouse.
REFERENCES:
patent: 5644127 (1997-07-01), Ohmae
Cheng Wen-Ping
Guo Fang-Diahn
Hsu Chi-Ho
Wang Min-Kun
Blackman Anthony J.
Hjerpe Richard A.
Holtek Semiconductor Inc.
Sun Raymond
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