Sensing device including a first electrode receiving a first driving signal and a second electrode receiving a second driving signal
A sensing device includes a touch panel including first and second sensor electrodes, and a touch panel controller acquiring a sensing signal from the touch panel and detecting a user input based on the sensing signal. The touch panel controller acquires the sensing signal from at least one of the first sensor electrodes and the second sensor electrodes in a first mode operating at a first power. The touch panel controller selects a first transmitting electrode, a second transmitting electrode, and receiving electrodes from one of the first sensor electrodes and the second sensor electrodes, inputs a first driving signal to the first transmitting electrode, and inputs a second driving signal having a phase difference of 180 degrees with respect to the first driving signal to the second transmitting electrode in a second mode operating at a second power and a third mode in which a sensing operation is performed.
1. A sensing device, comprising:
a plurality of first electrodes configured to receive a first driving signal and a plurality of second electrodes configured to receive a second driving signal, the plurality of first electrodes and the plurality of second electrodes are arranged alternately;
a plurality of third electrodes disposed between each of the plurality of first electrodes and the plurality of second electrodes, and extending in a direction that is the same as directions of the plurality of first electrodes and the plurality of second electrodes;
an electric charge amplifier configured to output a first voltage signal corresponding to a change in capacitance between each of the plurality of first electrodes and at least one of the plurality of third electrodes adjacent to each of the plurality of first electrodes, and outputs a second voltage signal corresponding to a change in capacitance between each of the plurality of second electrodes and at least one of the plurality of third electrodes adjacent to each of the plurality of second electrodes;
a processor configured to detect a user input using the first voltage signal and the second voltage signal; and
at least one fourth electrode disposed between the plurality of third electrodes and between at least one of the plurality of first electrodes and at least one of the plurality of second electrodes,
wherein the first driving signal and the second driving signal have a phase difference of 180 degrees therebetween for offsetting noises flowing into a common electrode of a display panel from the plurality of first electrodes and the plurality of second electrodes.
2. The sensing device of claim 1 , wherein
the at least one fourth electrode shields the at least one of the plurality of first electrodes and the at least one of the plurality of second electrodes, disposed nearby the at least one fourth electrode, respectively.
3. The sensing device of claim 1 , wherein some of the plurality of third electrodes are disposed adjacent to both sides of at least some of the plurality of first electrodes and the plurality of second electrodes.
4. The sensing device of claim 3 , wherein each of third electrodes disposed adjacent to both sides of at least some of the plurality of first electrodes and the plurality of second electrodes output a first sensing signal and a second sensing signal respectively, having a phase difference of 180 degrees therebetween.
5. The sensing device of claim 3 , wherein each of third electrodes disposed adjacent to both sides of at least some of the plurality of first electrodes and the plurality of second electrodes output a sensing signal respectively, having a same phase.
6. The sensing device of claim 3 , wherein a number of third electrodes forming mutual capacitance with each of the plurality of first electrode is the same as a number of third electrodes forming mutual capacitance with each of the plurality of second electrode.
7. The sensing device of claim 3 , wherein one of the plurality of third electrodes is further disposed on one side of each of third electrodes disposed adjacent to both sides of at least some of the plurality of first electrodes and the plurality of second electrodes.
8. The sensing device of claim 7 , wherein sensing signals, output from a pair of the plurality of third electrodes disposed side by side, are summed and output.
9. The sensing device of claim 1 , wherein each of first parasitic capacitances generated between a common electrode of display panel and each of the plurality of first and second electrodes is the same as each other, each of second parasitic capacitances generated between the common electrode of display panel and each of the plurality of third electrodes is the same as each other.