Input sensing device and display device including the same
An input sensing device includes: an input sensor including a transmission electrode, a first reception electrode, and a second reception electrode; and a readout circuit configured to provide a transmit signal to the transmission electrode, to receive a first receive signal from the first reception electrode, and to receive a second receive signal from the second reception electrode, wherein the readout circuit includes: a switching circuit configured to transfer the first receive signal and the second receive signal to a first node and a second node, respectively, during a touch sensing period and to transfer one of the first receive signal and the second receive signal to the first node and the second node during a compensation period; a first output circuit configured to convert a signal of the first node into a first sensing signal; and a second output circuit configured to convert a signal of the second node into a second sensing signal.
1. An input sensing device comprising:
an input sensor including a transmission electrode, a first reception electrode, and a second reception electrode; and
a readout circuit configured to provide a transmit signal to the transmission electrode, to receive a first receive signal from the first reception electrode, and to receive a second receive signal from the second reception electrode,
wherein the readout circuit includes:
a switching circuit configured to transfer the first receive signal and the second receive signal to a first node and a second node, respectively, during a touch sensing period and to transfer one of the first receive signal and the second receive signal to the first node and the second node during a compensation period;
a first output circuit configured to convert a signal of the first node into a first sensing signal; and
a second output circuit configured to convert a signal of the second node into a second sensing signal.
2. The input sensing device of claim 1 , wherein, during the touch sensing period, the first output circuit is configured to mix the signal of the first node and a first carrier so as to be output as the first sensing signal, and the second output circuit is configured to mix the signal of the second node and the first carrier so as to be output as the second sensing signal.
3. The input sensing device of claim 1 , wherein, during the compensation period, the first output circuit is configured to mix the signal of the first node and a first carrier so as to be output as the first sensing signal, and the second output circuit is configured to mix the signal of the second node and a second carrier different from the first carrier so as to be output as the second sensing signal.
4. The input sensing device of claim 3 , wherein the first carrier is an in-phase carrier, and the second carrier is a quadrature phase carrier.
5. The input sensing device of claim 1 , wherein the switching circuit includes:
a first switch connected between a first reception line connected with the first reception electrode and the first node;
a second switch connected between a second reception line connected with the second reception electrode and the second node; and
a coupling switch connected between the first node and the second node.
6. The input sensing device of claim 5 , wherein, during the touch sensing period, the first switch and the second switch are configured to be in an on state, and the coupling switch is configured to be in an off state.
7. The input sensing device of claim 5 , wherein the compensation period includes a first compensation period and a second compensation period,
wherein, during the first compensation period, the first switch and the coupling switch are configured to be in an on state, and the second switch is configured to be in an off state, and
wherein, during the second compensation period, the second switch and the coupling switch are configured to be in the on state, and the first switch is configured to be in the off state.
8. The input sensing device of claim 1 , wherein each of a first frame and a second frame includes the touch sensing period and the compensation period.
9. The input sensing device of claim 8 , wherein the readout circuit is configured to calculate touch coordinates of the first frame based on the first sensing signal and the second sensing signal obtained during the touch sensing period of the first frame.
10. The input sensing device of claim 8 , wherein the readout circuit is configured to calculate touch coordinates of the second frame based on the first sensing signal and the second sensing signal obtained during the compensation period of the first frame and the first sensing signal and the second sensing signal obtained during the touch sensing period of the second frame.
11. The input sensing device of claim 8 , wherein, during the compensation period, the switching circuit is configured to output the first receive signal to the first node and the second node, and
wherein the readout circuit is configured to calculate touch coordinates of the second frame based on the first sensing signal and the second sensing signal obtained during the compensation period of the first frame and the first sensing signal and the second sensing signal obtained during the touch sensing period of the second frame.
12. The input sensing device of claim 1 , wherein each of a first frame, a second frame, and a third frame includes the touch sensing period and the compensation period,
wherein, during the compensation period of each of the first frame and the third frame, the switching circuit is configured to output the first receive signal to the first node and the second node, and
wherein, during the compensation period of the second frame, the switching circuit is configured to output the second receive signal to the first node and the second node.
13. The input sensing device of claim 12 , wherein the readout circuit is configured to calculate touch coordinates of the second frame based on the first sensing signal and the second sensing signal obtained during the compensation period of the first frame and the first sensing signal and the second sensing signal obtained during the touch sensing period of the second frame, and
wherein the readout circuit is configured to calculate touch coordinates of the third frame based on the first sensing signal and the second sensing signal obtained during the compensation period of the second frame and the first sensing signal and the second sensing signal obtained during the touch sensing period of the third frame.
14. A display device comprising:
a display panel;
an input sensor on the display panel and including a transmission electrode, a first reception electrode, and a second reception electrode; and
a readout circuit configured to output a transmit signal to the transmission electrode, to receive a first receive signal from the first reception electrode, and to receive a second receive signal from the second reception electrode,
wherein the readout circuit includes:
a switching circuit configured to transfer the first receive signal and the second receive signal to a first node and a second node, respectively, during a touch sensing period and to transfer one of the first receive signal and the second receive signal to the first node and the second node during a compensation period;
a first output circuit configured to convert a signal of the first node into a first sensing signal; and
a second output circuit configured to convert a signal of the second node into a second sensing signal.
15. The display device of claim 14 , wherein, during the touch sensing period, the first output circuit is configured to mix the signal of the first node and a first carrier so as to be output as the first sensing signal, and the second output circuit is configured to mix the signal of the second node and the first carrier so as to be output as the second sensing signal.
16. The display device of claim 14 , wherein, during the compensation period, the first output circuit is configured to mix the signal of the first node and a first carrier so as to be output as the first sensing signal, and the second output circuit is configured to mix the signal of the second node and a second carrier different from the first carrier so as to be output as the second sensing signal.
17. The display device of claim 14 , wherein the switching circuit includes:
a first switch connected between a first reception line connected with the first reception electrode and the first node;
a second switch connected between a second reception line connected with the second reception electrode and the second node; and
a coupling switch connected between the first node and the second node.
18. The display device of claim 17 , wherein, during the touch sensing period, the first switch and the second switch are configured to be in an on state, and the coupling switch is configured to be in an off state.
19. The display device of claim 17 , wherein the compensation period includes a first compensation period and a second compensation period,
wherein, during the first compensation period, the first switch and the coupling switch are configured to be in an on state, and the second switch is configured to be in an off state, and
wherein, during the second compensation period, the second switch and the coupling switch are configured to be in the on state, and the first switch is configured to be in the off state.
20. The display device of claim 14 , wherein each of a first frame and a second frame includes the touch sensing period and the compensation period,
wherein the readout circuit is configured to calculate touch coordinates of the first frame based on the first sensing signal and the second sensing signal obtained during the touch sensing period of the first frame, and
wherein the readout circuit is configured to calculate touch coordinates of the second frame based on the first sensing signal and the second sensing signal obtained during the compensation period of the first frame and the first sensing signal and the second sensing signal obtained during the touch sensing period of the second frame.