Touch detection method and touch detection apparatus

1. A method of generating pseudo differential touch signals, the method comprising:

generating a first touch signal corresponding to a touch input;

maintaining the generated first touch signal; and

generating a second touch signal corresponding to the touch input,

wherein the first touch signal and the second touch signal are in a pseudo differential relationship,

wherein the generation of the first touch signal includes:

precharging parallel capacitors to a first voltage, wherein the parallel capacitors comprise a self-capacitor and a parasitic capacitor of a touch panel connected in a parallel manner, and wherein the self- capacitor is formed between an object which provides an input to the touch panel and an electrode of the touch panel;

precharging a charge-sharing capacitor to a second voltage; and

performing charge sharing by connecting the parallel capacitors to the charge-sharing capacitor,

wherein the generation of the second touch signal includes:

precharging the parallel capacitors to the second voltage;

precharging the charge-sharing capacitor to the first voltage; and

performing charge sharing by connecting the parallel capacitors to the charge-sharing capacitor, and

wherein the first voltage and the second voltage have levels complementary to each other.

2. The method of claim 1 , wherein the generation of the first touch signal and the generation of the second touch signal are performed at a time interval.

3. The method of claim 1 , wherein the maintaining of the generation of the first touch signal and the generation of the second touch signal are simultaneously performed.

4. A method of detecting a touch, the method comprising:

generating a first touch signal corresponding to a touch input;

maintaining the generated first touch signal; and

generating a second touch signal corresponding to the touch input,

wherein the first touch signal and the second touch signal are in a pseudo differential relationship,

wherein the generation of the first touch signal includes:

precharging parallel capacitors to a first voltage, wherein the parallel capacitors comprise a self-capacitor and a parasitic capacitor of a touch panel connected in a parallel manner, and wherein the self- capacitor is formed between an object which provides an input to the touch panel and an electrode of the touch panel;

precharging a charge-sharing capacitor to a second voltage; and

performing charge sharing by connecting the parallel capacitors to the charge-sharing capacitor,

wherein the generation of the second touch signal includes:

precharging the parallel capacitors to the second voltage;

precharging the charge-sharing capacitor to the first voltage; and

performing charge sharing by connecting the parallel capacitors to the charge-sharing capacitor, and

wherein the first voltage and the second voltage have levels complementary to each other.

5. The method of claim 4 , wherein the generation of the first touch signal and the generation of the second touch signal are performed at a time interval.

6. The method of claim 4 , wherein the generation of the first touch signal further includes integrating a signal provided by the charge-sharing capacitor after the charge sharing and outputting the integrated signal.

7. The method of claim 4 , wherein the generation of the second touch signal further includes integrating a signal provided by the charge-sharing capacitor after the charge sharing and outputting the integrated signal.

8. The method of claim 4 , wherein the maintaining of the generation of the first touch signal and the generation of the second touch signal are simultaneously performed.

9. An apparatus for detecting a touch, the apparatus comprising:

a touch panel configured to include an electrode constituting a self-capacitor together with an object, wherein the object provides an input to the touch panel;

a charge-sharing unit configured to include a charge-sharing capacitor which is charge-shared with the self-capacitor;

a differential signal generation unit configured to receive an output signal of the charge-sharing unit and generate a pair of pseudo differential touch signals; and

a control unit configured to control the charge-sharing unit so that the charge-sharing unit performs charge sharing and outputting of the output signal,

wherein the charge-sharing unit is controlled by the control unit to perform the charge sharing by precharging parallel capacitors to a first voltage, the parallel capacitors comprising the self-capacitor and a parasitic capacitor of the touch panel connected in a parallel manner, precharging the parallel capacitors to a first voltage, precharging the charge-sharing capacitor to a second voltage, electrically connecting the parallel capacitors to the charge-sharing capacitor for first charge sharing, precharging the parallel capacitors to the second voltage, precharging the charge-sharing capacitor to the first voltage, and electrically connecting the parallel capacitors to the charge-sharing capacitor for second charge sharing,

wherein the first voltage and the second voltage have levels complementary to each other, and

wherein the charge-sharing unit, the differential signal generating unit, and the control unit are each implemented via at least one processor.

10. The apparatus of claim 9 , wherein the pair of pseudo differential touch signals include:

a signal generated by sampling a voltage provided by the charge-sharing capacitor through the first charge sharing and maintaining the sampled voltage; and

a signal generated by a voltage provided by the charge-sharing capacitor through the second charge sharing.

11. The apparatus of claim 9 , wherein the differential signal generation unit includes:

a charge amplifier configured to integrate the signal provided by the charge-sharing unit; and

a delay unit configured to sample and hold an output signal of the charge amplifier.