Coordinate input device
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United States of America Patent
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Aug 21, 2012
Grant Date -
Oct 29, 2009
app pub date -
Mar 13, 2009
filing date -
Apr 24, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A coordinate inputting device includes an X+ electrode having a plurality of X+ branch patterns extending from one side to the other side in the X direction, an X− electrode having a plurality of X− branch patterns extending from one side to the other side in the X direction, a Y+ electrode having a plurality of Y+ branch patterns extending from one side to another side in the Y direction, and a Y− electrode having a plurality of Y− branch patterns extending from one side to the other side in the Y direction. An X, Y coordinate position of an object is detected from, respectively, the difference between the floating capacitances of the X+ electrode and X− electrode, and the difference between the floating capacitances of Y+ electrode and Y− electrode, which change according to the surface area of the electrodes in proximity to the object to be detected.
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