Display apparatus and method of driving the same
View Patent ↗A display apparatus includes a display panel, sensor circuits, and a detection circuit. Each sensor circuit senses at least two external signals different from each other and outputs a sensing signal. The detection circuit receives the sensing signal to detect a position to which the external signals are applied. Each sensor circuit includes sensors commonly connected to an output terminal, a scan line which receives a scan signal, a capacitor disposed between the scan line and the output terminal, charged with a first voltage in response to the scan signal, and charged with a second voltage greater than the first voltage in response to the current signal after the scan line is floated, a switching device which outputs the sensing signal in response to the second voltage, and a readout line which applies the sensing signal output from the switching device to the detection circuit.
1. A display apparatus comprising:
a display panel which displays an image, wherein the display panel comprises a plurality of pixels;
a plurality of sensor circuits, wherein each of the plurality of sensor circuits senses at least two external signals different from each other and outputs a sensing signal; and
a detection circuit which receives the sensing signal and detects a position at which the at least two external signals are sensed,
wherein each of the plurality of sensor circuits comprises:
a plurality of sensors commonly connected to an output terminal, wherein the plurality of sensors senses the at least two external signals and outputs a current signal corresponding to the at least two external signals, and the current signal is output through the output terminal;
a scan line which receives a scan signal;
a capacitor disposed between the scan line and the output terminal, charged with a first voltage in response to the scan signal, and charged with a second voltage in response to the current signal after the scan line is floated, wherein a level of the first voltage is greater than a level of the second voltage;
a switching device which outputs the sensing signal in response to the second voltage; and
a readout line which applies the sensing signal output from the switching device to the detection circuit.
2. The display apparatus of claim 1 , wherein
a level of the first voltage is less than a level of a threshold voltage of the switching device, and
a level of the second voltage is greater than a level of the threshold voltage of the switching device.
3. The display apparatus of claim 1 , further comprising a scan driver connected to the scan line to apply the scan signal to the scan line.
4. The display apparatus of claim 3 , wherein the scan driver comprises:
a shift register which outputs a base signal;
an inverter circuit which inverts the base signal from the shift register and outputs the scan signal; and
a switching circuit connected to an output terminal of the inverter circuit, wherein the scan line is floated by the switching circuit in response to a switching signal during a predetermined period.
5. The display apparatus of claim 1 , wherein each of the plurality of sensors comprises:
a first sensor which senses a first light having a wavelength of a visible light; and
a second sensor which senses a second light having a wavelength of an infrared light.
6. The display apparatus of claim 5 , wherein the second sensor comprises a filter which transmits the second light and blocks the first light.
7. The display apparatus of claim 1 , wherein each of the first sensor and the second sensor comprises:
a gate electrode connected to a voltage line which supplies a first bias voltage;
a source electrode connected to a voltage line which supplies a second bias voltage; and
a drain electrode connected to the output terminal.
8. The display apparatus of claim 7 , wherein the switching device comprises:
a gate electrode connected to the scan line;
a drain electrode connected to the readout line; and
a source electrode connected to a voltage line which supplies a third bias voltage.
9. The display apparatus of claim 8 , wherein the capacitor comprises:
a first electrode electrically connected to the gate electrode of the switching device; and
a second electrode electrically connected to the output terminal.
10. The display apparatus of claim 8 , wherein the first electrode is integrated with the gate electrode of the switching device.
11. The display apparatus of claim 10 , wherein each of the switching device, the first sensor and the second sensor comprises a semiconductor layer.
12. The display apparatus of claim 11 , wherein the semiconductor layer comprises silicon-germanium.
13. The display apparatus of claim 1 , wherein the plurality of sensor circuits is disposed in the display panel.
14. The display apparatus of claim 13 , wherein
the display panel comprises an upper substrate and a lower substrate, and
the plurality of sensor circuits is disposed on the upper substrate.