CAPACITIVE-INDUCTIVE TOUCH SCREEN
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United States of America Patent
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Issued Date -
Dec 30, 2010
app pub date -
Jun 25, 2009
filing date -
Jun 25, 2009
priority date (Note) -
Abandoned
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Abstract
A touch screen uses a combination of capacitive sensing and inductive sensing applied to the same sensor pattern. A capacitive sensor uses the electric field formed by the columns and rows of the sensor matrix. An inductive sensor uses the magnetic field formed by current flowing in column and row lines to induce an inductive pen. Using the same sensor lines, the magnetic field created by the oscillating inductive pen is detected. Both methods require no moving elements in the sensor and it is possible to combine both method of detections in the same sensor pattern. Using switch matrices, the sensor lines are operated in an open loop fashion for the capacitive detection mode, and are operated in a closed loop fashion for the inductive detection mode.
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