Touch panel providing driving signals with reduced offsets

1. A touch panel, comprising:

a touch sensing circuit comprising a plurality of driving electrode lines and a plurality of sensing electrode lines, wherein the sensing electrode lines are insulated from the driving electrode lines;

a driving signal generation circuit that generates a plurality of driving signals and transmits the driving signals to the driving electrode lines; and

a sensing circuit that receives a plurality of sensing signals from the sensing electrode lines,

wherein the sensing circuit comprises a plurality of pseudo differential charge amplifiers that receive the sensing signals, and each pseudo differential charge amplifier comprises two single-ended charge amplifiers connected to each other,

wherein the driving signals have voltages that are not equal to zero during a first time zone, and a sum of driving signals generated at a same time is maintained to be equal to zero during the first time zone.

2. The touch panel of claim 1 , wherein

the driving signals are periodic voltages that are repeated at intervals of a second time zone, wherein the second time zone is longer than the first time zone,

a period during which the sum of the driving signals is maintained to be equal to zero is shorter than the first time zone, and

the sum of the driving signals generated at the same time is maintained to be equal to zero during the first time zone and the second time zone.

3. The touch panel of claim 1 , wherein the driving signal generation circuit comprises a code generator that generates the driving signals.

4. The touch panel of claim 3 , wherein the code generator comprises a first code generator that generates signals having non-zero voltages, and a second code generator that generates signals having voltages that sum to zero when added to the voltages of the signals generated by the first code generator.

5. The touch panel of claim 4 , further comprising:

a plurality of driving analog multiplexers connected to the first and second code generators.

6. The touch panel of claim 1 , further comprising:

a plurality of sensing analog multiplexers that directly receives the sensing signals and that transmits the sensing signals to the pseudo differential charge amplifiers.

7. The touch panel of claim 1 , wherein the pseudo differential charge amplifiers receive the sensing signals directly from the sensing electrode lines.

8. The touch panel of claim 1 , wherein the touch sensing circuit further comprises a plurality of capacitors disposed at intersections between the driving electrode lines and the sensing electrode lines.

9. A touch panel, comprising:

a touch sensing circuit comprising a plurality of driving electrode lines and a plurality of sensing electrode lines, wherein the sensing electrode lines are insulated from the driving electrode lines;

a driving signal generation circuit that generates a plurality of driving signals and transmits the driving signals to the driving electrode lines; and

a sensing circuit that receives a plurality of sensing signals from the sensing electrode lines,

wherein

the driving signals are periodic voltages that are repeated at intervals of a first time zone,

the first time zone is divided into a plurality of second time zones, wherein each of the second time zones is shorter than the first time zone,

the driving signals have voltages that are not equal to zero during all time zones, and

a sum of the driving signals is maintained to be equal to zero during each time zone,

wherein the driving signal generation circuit comprises:

a code generator for generating the driving signals including a first code generator that generates signals having non-zero voltages, and a second code generator that generates signals having voltages that sum to zero when added to the voltages of the signals generated by the first code generator; and

a plurality of driving analog multiplexers connected to the first and second code generators, and configured to output one among an output signal of the first code generator and an output signal of the second code generator.

10. The touch panel of claim 9 , wherein the sensing circuit comprises a plurality of pseudo differential charge amplifiers that receive the sensing signals directly from the sensing electrode lines.

11. The touch panel of claim 9 , wherein the driving signals have a same period.

12. A method of driving a touch panel, comprising:

transmitting a first signal from a voltage source to a code generator circuit;

dividing the first signal transmitted to the code generator circuit into a plurality of driving signals;

transmitting the driving signals to a plurality of driving electrode lines; and

receiving, by a sensing circuit, a plurality of sensing signals from a plurality of sensing electrode lines,

wherein the sensing signals are received by a plurality of pseudo differential charge amplifiers disposed in the sensing circuit, and each pseudo differential charge amplifier comprises two single-ended charge amplifiers connected to each other,

wherein the driving signals have voltages that are not equal to zero during a first time zone, and a sum of driving signals generated in a same time zone is maintained to be equal to zero during the first time zone.

13. The method of claim 12 , wherein the code generator circuit comprises a first code generator that generates signals having non-zero voltages, and a second code generator that generates signals having voltages that sum to zero when added to the voltages of the signals generated by the first code generator.