Input sensing device and display device including the same
A display device includes a display unit including pixels. A sensor unit overlaps with the display unit and includes sensors. A sensor driver transmits a driving signal to the sensors, and receives sensing signals corresponding to the driving signal from the sensors. One sensing period includes a first sensing period and a second sensing period. The sensor driver transmits a first driving signal having a first frequency to the sensors in the first sensing period, and transmits a second driving signal having a second frequency different from the first frequency to the sensors in the second sensing period.
1. A display device comprising:
a display unit including pixels;
a sensor unit overlapping with the display unit, the sensor unit including sensors; and
a sensor driver configured to transmit a driving signal to the sensors, and configured to receive sensing signals corresponding to the driving signal from the sensors,
wherein:
one sensing period includes a first sensing period and a second sensing period;
the sensor driver transmits a first driving signal having a first frequency to each of the sensors in the first sensing period, and transmits a second driving signal having a second frequency different from the first frequency to each of the sensors in the second sensing period;
first sensing signals provided from the sensors, corresponding to the first driving signal, are sensitive to a touch input and a change in a peripheral temperature; and
second sensing signals provided from the sensors, corresponding to the second driving signal, are insensitive to the change in the peripheral temperature.
2. The display device of claim 1 , wherein the sensor driver:
senses the touch input, based on first sensing signals provided from the sensors, corresponding to the first driving signal; and
determines whether the touch input is actually input, based on second sensing signals provided from the sensors, corresponding to the second driving signal.
3. The display device of claim 2 , wherein:
the first sensing signals represent capacitances of the sensors; and
the sensor driver senses the touch input by comparing the capacitances with reference capacitances of the sensors, and periodically updates the reference capacitances.
4. The display device of claim 3 , wherein the reference capacitances are changed according to a peripheral environment factor including a temperature.
5. The display device of claim 1 , wherein the second frequency is greater than the first frequency.
6. The display device of claim 1 , wherein, when a change in the second sensing signals corresponding to the second driving signal is within a reference range, the sensor driver determines that the touch input has not actually occurred.
7. The display device of claim 1 , wherein:
the pixels include light emitting elements;
the display unit further includes an insulating layer covering the light emitting elements; and
the sensor unit is directly formed on the insulating layer.
8. The display device of claim 1 , further comprising a display driver configured to drive the display unit in response to a horizontal synchronization signal,
wherein the first driving signal and the second driving signal are synchronized with the horizontal synchronization signal.
9. The display device of claim 1 , further comprising a display driver configured to drive the display unit in response to a horizontal synchronization signal,
wherein the first driving signal and the second driving signal are asynchronized with the horizontal synchronization signal.
10. A display device comprising:
a display unit including pixels;
a sensor unit overlapping with the display unit, the sensor unit including sensors; and
a sensor driver configured to transmit a driving signal to the sensors, and configured to receive sensing signals corresponding to the driving signal from the sensors,
wherein:
one sensing period includes a first sensing period and a second sensing period;
the sensor driver is configured to transmit a first driving signal having a first frequency to each of the sensors in the first sensing period, and to transmit a second driving signal having a second frequency different from the first frequency to each of the sensors in the second sensing period;
the sensor driver operates in a first mode when a peripheral temperature is higher than or equal to a reference temperature, and operates in a second mode when the peripheral temperature is lower than the reference temperature; and
the sensor driver transmits only the first driving signal among the first and second driving signals to the sensors in the first mode, and sequentially transmits the first driving signal and the second driving signal to the sensors in the second mode.
11. The display device of claim 10 , wherein the sensor driver operates in the second mode when an average of reference capacitances of the sensors is less than a reference value.
12. The display device of claim 10 , further comprising a temperature sensor configured to measure the peripheral temperature.
13. An input sensing device comprising:
a sensor unit including sensors; and
a sensor driver configured to transmit a driving signal to the sensors and configured to receive sensing signals corresponding to the driving signal from the sensors,
wherein:
one sensing period includes a first sensing period and a second sensing period;
the sensor driver transmits a first driving signal having a first frequency to each of the sensors in the first sensing period, and transmits a second driving signal having a second frequency different from the first frequency to each of the sensors in the second sensing period;
first sensing signals provided from the sensors, corresponding to the first driving signal, are sensitive to a touch input and a change in a peripheral temperature; and
second sensing signals provided from the sensors, corresponding to the second driving signal, are insensitive to the change in the peripheral temperature.
14. The input sensing device of claim 13 , wherein the sensor driver:
senses the touch input, based on first sensing signals provided from the sensors, corresponding to the first driving signal; and
determines whether the touch input is actually input, based on second sensing signals provided from the sensors, corresponding to the second driving signal.
15. The input sensing device of claim 13 , wherein the second frequency is greater than the first frequency.
16. The input sensing device of claim 13 , wherein, when a change in the second sensing signals corresponding to the second driving signal is within a reference range, the sensor driver determines that the touch input has not actually occurred.
17. The input sensing device of claim 13 , wherein:
the sensor driver operates in a first mode when the peripheral temperature is higher than or equal to a reference temperature, and operates in a second mode when the peripheral temperature is lower than the reference temperature; and
the sensor driver transmits only the first driving signal among the first and second driving signals to the sensors in the first mode, and sequentially transmits the first driving signal and the second driving signal to the sensors in the second mode.
18. The input sensing device of claim 17 , wherein the sensor driver operates in the second mode when an average of reference capacitances of the sensors is less than a reference value.