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US 8,508,499 B2Granted
Touch sensing circuits and methods for detecting touch events
AssigneeDelta Electronics, Inc.
InventorMing-Jen Liang
Life of this patent
Estimating the term…
Abstract
A touch sensing circuit is provided. Signal generators output a pulse signal according to a control signal. Touch detection circuits are arranged as an array, generating a sensing signal according a touch event and the pulse signal. The touch detection circuits in the same row are coupled to the same signal generator. The sensing circuits are respectively coupled to the touch detection circuits in the same column, generating an output signal according to the sensing signal. The controller receives the output signal, outputs the control signal to control one of the signal generators outputting the pulse signal, and detects the touch detection circuit corresponding to the touch event according to the output control signal and the output signal.
Claims18
A touch sensing circuit, comprising:
- a plurality of signal generators outputting a pulse signal according to a control signal;
- a plurality of touch detection circuits arranged as an array, generating a sensing signal according to a touch event and the pulse signal, wherein the touch detection circuits on the same row are coupled to the same signal generator;
- a plurality of sensing circuits respectively coupled to the touch detection circuits on the same column, generating an output signal according to the sensing signal;
- and
- a controller receiving the output signal, outputting the control signal to enable one of the signal generators outputting the pulse signal, and detecting the touch detection circuit corresponding to the touch event according to the output control signal and the output signal;
- wherein the signal generator comprises:
- a pulse width modulator outputting a pulse width modulation signal;
- a direct-current power source providing a direct-current voltage;
- a first diode coupled between the touch detection circuit and the direct-current voltage, having a first anode and a first cathode;
- a second diode having a second cathode coupled to the first anode, and a second anode coupled to the first cathode;
- and
- a switching circuit coupled to the pulse width modulator and the direct-current power source, switching according to the pulse width modulation signal to output the pulse signal at a connection point of the first diode and the second diode.
9 more elements
A touch sensing circuit, comprising:
- a plurality of signal generators outputting a pulse signal according to a control signal;
- a plurality of sensing circuits generating an output signal according to a sensing signal;
- a plurality of first data lines extended along a first direction, and respectively coupled to a corresponding signal generator;
- a plurality of second data lines extended along a second direction orthogonal to the first direction, respectively coupled to a corresponding sensing circuit;
- a plurality of touch detection circuits respectively disposed on intersections of the first data lines and the second data lines, wherein one of the touch detection circuits receives the pulse signal and generates the sensing signal according to a touch event;
- and
- a controller receiving the output signal, outputting the control signal to enable one of the signal generators outputting the pulse signal, and detecting the touch detection circuit corresponding to the touch event according to the output control signal and the output signal;
- wherein the signal generator comprises:
- a pulse width modulator outputting a pulse width modulation signal;
- a direct-current power source providing a direct-current voltage;
- a first diode coupled between the touch detection circuit and the direct-current voltage, having a first anode and a first cathode;
- a second diode having a second cathode coupled to the first anode, and a second anode coupled to the first cathode;
- and
- a switching circuit coupled to the pulse width modulator and the direct-current power source, switching according to the pulse width modulation signal to output the pulse signal at a connection point of the first diode and the second diode.
11 more elements
A touch sensing circuit, comprising:
- a signal generator outputting a pulse signal according to a control signal;
- a touch detection circuit generating a sensing signal according to a touch event and the pulse signal, comprising:
- a first capacitor coupled to the signal generator;
- a second capacitor coupled to the first capacitor;
- a first diode having a first anode coupled to the second capacitor, and a first cathode outputting the sensing signal;
- a second diode having a second anode coupled to a reference power source, and a second cathode coupled to a connection point of the first diode and the second capacitor;
- a first resistor coupled between the reference power source and a connection point of the first capacitor and the second capacitor;
- and
- a touch sensing device coupled to the connection point of the first capacitor and the second capacitor, and providing a capacitive loading effect according to the touch event;
- a sensing circuit coupled to the touch detection circuit, and generating an output signal according to the sensing signal;
- and
- a controller outputting the control signal and detecting the touch event according to the output signal.
9 more elements
Dependencies are inferred from the claim text.