Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1994-02-28
1996-07-09
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345174, 345104, 178 18, G09G 500
Patent
active
055348920
ABSTRACT:
There is provided a display-integrated type tablet device which can achieve a high coordinate detection accuracy even when an electrode density of electrodes is greater than a electrode density of the other electrodes in a display panel. A segment electrode scanning clock signal for scanning segment electrodes having an electrode density three times as high as that of common electrodes has a frequency three times as high as a common electrode scanning clock signal. Shift data input to a segment electrode drive circuit has the same pulse width as that of the shift data input to a common electrode drive circuit. As a result, a scanning speed in an x-direction (shift speed of a segment electrode scanning signal) can be made approximately equal to a scanning speed in a y-direction (shift speed of a common electrode scanning signal). Furthermore, the width of the segment electrodes in an active state is made equal to the width of the common electrode. Thus a waveform of a voltage induced at a detection electrode of a detection pen in an x-coordinate detection period and a waveform of a voltage induced in a y-coordinate detection period are made approximately equal to each other to obtain a high coordinate detection accuracy.
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Conlin David G.
Luu Matthew
Oliver Milton
Sharp Kabushiki Kaisha
Weldon Ulysses
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