TOUCH PANEL DEVICE HAVING HIGH TOUCH SENSITIVITY AND TOUCH POSITIONING METHOD THEREOF
First Claim
1. A touch panel device comprising:
- a touch panel;
a first sensing capacitor disposed in the touch panel;
a first switch, electrically connected to the first sensing capacitor, for controlling an electrical connection between the first sensing capacitor and a power source;
s second switch, electrically connected to the first sensing capacitor;
a first storage capacitor, electrically connected to the second switch, for accumulating charges transferred from the first sensing capacitor so as to generate a first voltage when the second switch is turned on;
a third switch, electrically connected to the first storage capacitor, for controlling an operation of discharging the charges accumulated in the first storage capacitor;
a second sensing capacitor disposed in the touch panel;
a fourth switch, electrically connected to the second sensing capacitor, for controlling an electrical connection between the second sensing capacitor and the power source;
s fifth switch, electrically connected to the second sensing capacitor;
a second storage capacitor, electrically connected to the fifth switch, for accumulating charges transferred from the second sensing capacitor so as to generate a second voltage when the fifth switch is turned on;
a sixth switch, electrically connected to the second storage capacitor, for controlling an operation of discharging the charges accumulated in the second storage capacitor; and
a differential amplifier, electrically connected to the first storage capacitor and the second storage capacitor, for generating a touch readout signal through performing a differential amplification operation on the first and second voltages.
1 Assignment
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Accused Products
Abstract
A touch panel device having high touch sensitivity includes sensing capacitors, switches, storage capacitors, a differential amplifier and a signal processing unit. During a sense period, the switches are periodically turned on alternately for periodically transferring the charges of the sensing capacitors to the storage capacitors. The differential amplifier is put in use for amplifying the voltage difference of two corresponding storage capacitors for generating a touch readout signal. The signal processing unit performs an OR operation on two touch readout signals generated during different sense periods based on different sensing capacitor combinations regarding same panel touch position for providing a touch position signal.
16 Citations
21 Claims
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1. A touch panel device comprising:
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a touch panel; a first sensing capacitor disposed in the touch panel; a first switch, electrically connected to the first sensing capacitor, for controlling an electrical connection between the first sensing capacitor and a power source; s second switch, electrically connected to the first sensing capacitor; a first storage capacitor, electrically connected to the second switch, for accumulating charges transferred from the first sensing capacitor so as to generate a first voltage when the second switch is turned on; a third switch, electrically connected to the first storage capacitor, for controlling an operation of discharging the charges accumulated in the first storage capacitor; a second sensing capacitor disposed in the touch panel; a fourth switch, electrically connected to the second sensing capacitor, for controlling an electrical connection between the second sensing capacitor and the power source; s fifth switch, electrically connected to the second sensing capacitor; a second storage capacitor, electrically connected to the fifth switch, for accumulating charges transferred from the second sensing capacitor so as to generate a second voltage when the fifth switch is turned on; a sixth switch, electrically connected to the second storage capacitor, for controlling an operation of discharging the charges accumulated in the second storage capacitor; and a differential amplifier, electrically connected to the first storage capacitor and the second storage capacitor, for generating a touch readout signal through performing a differential amplification operation on the first and second voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A touch panel device comprising:
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a touch panel; a first sensing capacitor disposed in the touch panel; a second sensing capacitor disposed in the touch panel; a third sensing capacitor disposed in the touch panel; a fourth sensing capacitor disposed in the touch panel; a first differential amplifier comprising a first input end electrically connected to the first sensing capacitor, a second input end, and an output end for outputting a first touch readout signal; a second differential amplifier comprising a first input end, a second input end electrically connected to the fourth sensing capacitor, and an output end for outputting a second touch readout signal; a first switch comprising a first end electrically connected to the second sensing capacitor and a second end electrically connected to the second input end of the first differential amplifier; a second switch comprising a first end electrically connected to the third sensing capacitor and a second end electrically connected to the second input end of the first differential amplifier; a third switch comprising a first end electrically connected to the second sensing capacitor and a second end electrically connected to the first input end of the second differential amplifier; and a fourth switch comprising a first end electrically connected to the third sensing capacitor and a second end electrically connected to the first input end of the second differential amplifier. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A touch positioning method for use in a touch panel device, the touch panel device having plural sensing elements disposed at plural panel positions, the touch positioning method comprising:
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generating a plurality of first touch readout signals through sequentially scanning plural sets of two adjacent sensing elements; generating a plurality of second touch readout signals through sequentially scanning plural sets of two sensing elements spaced out at least one sensing element; generating a plurality of third touch readout signals through performing an OR operation on the first and second readout signals corresponding to each panel position of the touch panel device; performing a touch position analyzing operation on the third touch readout signals for generating at least one touch position signal; and outputting the at least one touch position signal. - View Dependent Claims (21)
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Specification