Touch sensing device and touchscreen device
There are provided a touch sensing device and a touchscreen device, the touch sensing device including a plurality of driving electrodes extended in a first axial direction, a plurality of sensing electrodes extended in a second axial direction intersecting with the first axial direction, an integrating circuit unit generating a first analog signal by integrating a change in capacitance generated in a first sensing electrode among the plurality of sensing electrodes and generating a second analog signal from a change in capacitance generated in a second sensing electrode adjacent to the first sensing electrode, and a subtracting unit calculating a difference in levels between the first and second analog signals.
1. A touch sensing device comprising:
a plurality of driving electrodes extended in a first axial direction;
a plurality of sensing electrodes extended in a second axial direction intersecting with the first axial direction;
an integrating circuit unit generating a first analog signal by integrating a change in capacitance generated in a first sensing electrode among the plurality of sensing electrodes and generating a second analog signal from a change in capacitance generated in a second sensing electrode adjacent to the first sensing electrode; and
a subtracting unit calculating a difference in levels between the first and second analog signals, wherein in the first and second analog signals having opposing polarities, the integrating circuit unit inverts the polarities of the first and second analog signals by changing a positive polarity to a negative polarity for the first analog signal and changing a negative polarity to a positive polarity for the second analog signal in response to a reset section of the integrating circuit unit.
2. The touch sensing device of claim 1 , wherein the integrating circuit unit integrates the change in capacitance generated in the first sensing electrode and the change in capacitance generated in the second sensing electrode to have opposite polarities.
3. The touch sensing device of claim 1 , wherein the subtracting unit calculates the difference in levels between the first and second analog signals to output a voltage having a positive polarity.
4. The touch sensing device of claim 1 , further comprising a driving circuit unit applying a predetermined driving signal to each of the plurality of driving electrodes.
5. A touchscreen device comprising:
a panel unit including a plurality of driving electrodes, a plurality of sensing electrodes, and
a plurality of node capacitors formed in intersections between the plurality of driving electrodes and the plurality of sensing electrodes;
a driving circuit unit applying a driving signal having a predetermined driving period to each of the plurality of driving electrodes;
a sensing circuit unit connected to the plurality of sensing electrodes to detect changes in capacitance in the plurality of node capacitors; and
a signal processing unit converting an output of the sensing circuit unit into a digital signal to determine a touch input, wherein the sensing circuit unit calculates a difference between a first analog signal and second analog signal generated in changes in capacitance in node capacitors formed in the sensing electrodes adjacent to each other among the plurality of node capacitors, wherein in the first and second analog signals having opposing polarities, the integrating circuit unit inverts the polarities of the first and second analog signals by changing a positive polarity to a negative polarity for the first analog signal and changing a negative polarity to a positive polarity for the second analog signal in response to a reset section of the sensing circuit unit.
6. The touchscreen device of claim 5 , wherein the sensing circuit unit charges a plurality of the node capacitors formed in one sensing electrode of the sensing electrodes adjacent to each other and a plurality of the node capacitors formed in the other sensing electrode thereof with voltages having opposite polarities.
7. The touchscreen device of claim 5 , wherein the sensing circuit unit includes:
a plurality of integrating circuits connected to the plurality of sensing electrodes, respectively;
a voltage setting unit setting polarities of voltages charged in the node capacitors formed in the sensing electrodes adjacent to each other to be opposed to each other; and
a subscribing unit calculating a difference in levels between output voltages of the integrating circuits connected to the sensing electrodes adjacent to each other, respectively.
8. The touchscreen device of claim 5 , wherein the signal processing unit includes:
a signal converting unit converting the output of the sensing circuit unit into a digital signal; and
a calculating unit determining the touch input from the digital signal.
9. The touchscreen device of claim 8 , wherein the calculating unit determines at least one of a gesture motion due to the touch input and the number of touch inputs.
10. The touchscreen device of claim 7 , wherein the driving circuit unit applies predetermined first and second voltages at different times, and
the voltage setting unit selects one of the predetermined first voltage and a predetermined third voltage to set the polarities of the voltages charged in the node capacitors formed in the sensing electrodes adjacent to each other to be opposed to each other.
11. The touchscreen device of claim 10 , wherein the predetermined first voltage, the predetermined second voltage, and the predetermined third voltage satisfy the following conditional Equation:
V 1− V 2=Δ V and V 3− V 2=Δ V [Conditional Equation]
where V 1 indicates the predetermined first voltage, V 2 indicates the second voltage, and V 3 indicates the predetermined third voltage.