DYNAMIC POWER ADJUSTMENT OF LEVEL SHIFT FOR NOISE REJECTION IN CAPACITANCE TOUCH SYSTEM
First Claim
1. A dynamic power adjustment circuit for noise rejection in a capacitance touch system, comprising:
- a power source configured to generate a fixed power voltage V;
a voltage adjustment circuit electrically connected to the power source, configured to generate a plurality of different voltage signals VH(1), VH(2), . . . , VH(n) from the power voltage V, to select one of the voltage signals VH(1), VH(2), . . . , VH(n) as a variable adjusting voltage VH according to a noise selection signal VH_SEL, and to output the adjusting voltage VH to a level shift for adjusting a driving voltage, wherein n is an integer larger than 1; and
a noise detection circuit electrically connected to the voltage adjustment circuit, configured to generate the noise selection signal VH_SEL for the voltage adjustment circuit according to a plurality of sensing signals RX generated by a capacitance touch sensing device of the capacitance touch system.
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Accused Products
Abstract
A dynamic power adjustment circuit for noise rejection in a capacitance touch system includes: a power source configured to generate a fixed power voltage V, a voltage adjustment circuit electrically connected to the power source, and a noise detection circuit electrically connected to the voltage adjustment circuit. The voltage adjustment circuit is configured to generate a plurality of different voltage signals VH(1), VH(2), . . . , VH(n) from the power voltage V, to select one of the voltage signals VH(1), VH(2), . . . , VH(n) as an adjusting voltage VH according to a noise selection signal VH_SEL, and to output the adjusting voltage VH to a level shift for adjusting a driving voltage. The noise detection circuit is configured to generate the noise selection signal VH_SEL for the voltage adjustment circuit according to a plurality of sensing signals RX generated by a capacitance touch sensing device of the capacitance touch system.
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Citations
20 Claims
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1. A dynamic power adjustment circuit for noise rejection in a capacitance touch system, comprising:
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a power source configured to generate a fixed power voltage V; a voltage adjustment circuit electrically connected to the power source, configured to generate a plurality of different voltage signals VH(1), VH(2), . . . , VH(n) from the power voltage V, to select one of the voltage signals VH(1), VH(2), . . . , VH(n) as a variable adjusting voltage VH according to a noise selection signal VH_SEL, and to output the adjusting voltage VH to a level shift for adjusting a driving voltage, wherein n is an integer larger than 1; and a noise detection circuit electrically connected to the voltage adjustment circuit, configured to generate the noise selection signal VH_SEL for the voltage adjustment circuit according to a plurality of sensing signals RX generated by a capacitance touch sensing device of the capacitance touch system. - View Dependent Claims (2, 3, 4, 5)
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6. A driving system for a touch display having a capacitance touch sensing device for sensing a touch event, comprising:
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a touch sensing controller configured to output a plurality of driving voltages and to receive a plurality of sensing signals RX from the capacitance touch sensing device, and to determine whether the touch event occurs by comparing each sensing signal RX to a threshold value; a level shift configured to receive the driving voltages and a variable adjusting voltage VH and to send a plurality of scanning signals TX to the touch sensing device, wherein the level shift generates the scanning signals by shifting voltage levels of the driving voltages with the adjusting voltage VH; and a dynamic power adjustment circuit configured to receive the plurality of sensing signals RX from the touch sensing controller, and to generate the adjusting voltage VH according to noise detection of the plurality of sensing signals RX. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for driving a touch display for sensing a touch event, comprising:
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receiving a plurality of sensing signals RX from a capacitance touch sensing device of the touch display; generating a variable adjusting voltage VH according to noise detection of the plurality of sensing signals RX; generating a plurality of scanning signals TX according to a plurality of driving voltages and the adjusting voltage VH; and driving the capacitance touch sensing device by the plurality of scanning signals TX. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification