IMAGE-DISPLAY-DEVICE DRIVE METHOD, IMAGE DISPLAY DEVICE, AND IMAGE DISPLAY SYSTEM
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United States of America Patent
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Issued Date -
Feb 27, 2014
app pub date -
Aug 6, 2012
filing date -
Dec 7, 2011
priority date (Note) -
Abandoned
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Abstract
Discharge for detecting the position coordinates of an electronic pen is caused stably, and the position coordinates are detected accurately. For this purpose, in a driving method of an image display device, an image display subfield, a y-coordinate detection subfield, and an x-coordinate detection subfield are included in one field. In an initializing period of the x-coordinate detection subfield, a first voltage is applied to data electrodes and a first down-ramp voltage is applied to scan electrodes. In the initializing period of the image display subfield, a second voltage is applied to the data electrodes and a second down-ramp voltage is applied to the scan electrodes. The voltage derived by subtracting an arrival voltage of the first down-ramp voltage from the first voltage is set higher than the voltage derived by subtracting an arrival voltage of the second down-ramp voltage from the second voltage.
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