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US 2011/0031042 A1Published application
Touch detecting device and method thereof
AssigneeSilicon Integrated Systems Corp.
InventorsHung-Wei WU, Chih-Yu CHANG
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Abstract
A touch detecting device comprises at least one driving circuit, a plurality of conductive lines and at least one sensing circuit. The originally available conductive lines of a touch panel are used to detect a finger touch by means of detecting a current leakage through the finger to the ground. Thus, the invention can reduce the hardware cost, avoid noise interference and correctly respond to a finger touch
Claims33
A touch detecting device for a touch panel, comprising:
- at least one driving unit, each generating at least one driving signal according to a specified sequence;
- a sensing array, the sensing array comprising a plurality of conductive lines, each receiving one of the at least one driving signal and generating an output signal, wherein the plurality of conductive lines are arranged to form a specified two-dimension coordinate system;
- and
- at least one sensing circuit, each receiving at least one of the output signals and performing signal extraction operations to generate a measuring value;
- wherein the amplitude of the output signal and the magnitude of the measuring value are related to whether a user touch is present on the sensing array;
- and
- wherein each of at least one touched conductive line permits a leakage current flowing from at least one of the plurality of conductive lines through the user's body to ground when the user touch is present on the sensing array.
4 more elements
A touch detecting device for a touch panel, comprising:
- a wave generator for generating in parallel a plurality of wave signals according to a specified frequency;
- a sensing array, the sensing array comprising a plurality of conductive lines, wherein the plurality of conductive lines are arranged to form a specified two-dimension coordinate system and the plurality of conductive lines receive in parallel the plurality of wave signals to generate a plurality of modulated signals;
- a demodulation unit for receiving in parallel the plurality of modulated signals and performing demodulation according to their corresponding wave signals to generate a plurality of touch signals;
- and
- a calculating unit for receiving in parallel the plurality of touch signals and generating a plurality of measuring values;
- wherein the amplitudes of the plurality of modulated signals, the amplitudes of the plurality of touch signals and the magnitudes of the plurality of measuring values are related to whether a user touch is present on the sensing array;
- and
- wherein each of at least one touched conductive line permits a leakage current flowing from at least one of the plurality of conductive lines through the user's body to ground when the user touch is present on the sensing array.
5 more elements
A touch detecting method for a touch panel, comprising:
- according to a specified frequency, generating in parallel a plurality of driving signals;
- providing a sensing array, the sensing array comprising a plurality of conductive lines, wherein the plurality of conductive lines are arranged to form a specified two-dimension coordinate system and the plurality of conductive lines receive in parallel the plurality of driving signals to generate a plurality of output signals;
- and
- according to their corresponding driving signals, performing signal demodulation operations on the plurality of output signals in parallel to obtain a plurality measuring values;
- wherein the amplitudes of the output signals and the magnitudes of the measuring values are related to whether a user touch is present on the sensing array;
- and
- wherein each of at least one touched conductive line permits a leakage current flowing from at least one of the plurality of conductive lines through the user's body to ground when the user touch is present on the sensing array.
4 more elements
Dependencies are inferred from the claim text.