Sensing circuit and display apparatus including the same
View Patent ↗A sensing circuit includes a sensor array, a first controller and a second controller. The sensor array is charged by a sensing signal corresponding to an external light in response to a driving signal during a first time period and discharged in response to a switching signal during a second time period. The first controller provides the driving signal to the sensor array. The second controller provides the switching signal to the sensor array.
1. A sensing circuit comprising:
a sensor array having a plurality of sensors are simultaneously charged by a sensing signal corresponding to an external light in response to a driving signal during a first time period and discharged in response to respective switching signals during a second time period after the first time period in response to a control signal;
a first controller which provides the driving signal to the sensor array; and
a second controller which provides the switching signals to the sensor array,
wherein each of the sensors comprises,
a light receiving part which outputs the sensing signal corresponding to the external light in response to the driving signal received during a frame time period which includes the first time period and the second time period;
a charging part which charges the sensing signal;
a charging control part connecting between the light receiving part and the charging part and which is turned on during the first time period and turned off during the second time period in response to the control signal; and
a switching part connected to the charging part and which reads out the sensing signal charged at the charging part during the second time period of the frame time period.
2. The sensing circuit of claim 1 , further comprising a third controller which provides the control signal to the charging control part.
3. The sensing circuit of claim 1 , wherein the plurality of sensors are arranged in a matrix form.
4. The sensing circuit of claim 1 , further comprising: a first signal line connected to the first controller and which provides a respective switching signal of the driving signal to the light receiving part; a switching line connected to the second controller and which provides a respective switching signal to the charging control part.
5. The sensing circuit of claim 1 , wherein the light receiving part comprises at least one of a photo thin film transistor and a PIN diode.
6. The sensing circuit of claim 1 , wherein the driving signal provided to the light receiving part from the first controller is a direct-current voltage.
7. A display apparatus comprising:
a display panel which receives a light and displays an image; and
a sensing circuit which detects an external light from an external source and provides a sensing signal corresponding to the external light to the display panel,
wherein the sensing circuit comprises:
a sensor array having a plurality of sensors are simultaneously charged by the sensing signal in response to a driving signal during a first time period and discharged in response to respective switching signals during a second time period after the first time period;
a first controller which provides the driving signal to the sensor array; and
a second controller which provides the switching signals to the sensor array,
wherein each of the sensors comprises,
a light receiving part which outputs the sensing signal corresponding to the external light in response to the driving signal received during a frame time period which includes the first time period and the second time period;
a charging part which charges the sensing signal;
a charging control part connecting between the light receiving part and the charging part and which is turned on during the first time period and turned off during the second time period in response to the control signal; and
a switching part connected to the charging part and which reads out the sensing signal charged at the charging part during the second time period of the frame time period.
8. The display apparatus of claim 7 , further comprising
a third controller which provides the control signal to the sensor array corresponding to the charging control part.
9. The display apparatus of claim 7 , wherein the plurality of sensors are arranged in a matrix form.
10. The display apparatus of claim 7 , further comprising:
a first signal line connected to the first controller and which provides the driving signal to the light receiving part; a switching line connected to the second controller and which provides a respective switching signal of the switching signals to the switching part; and a second signal line connected to the third controller and which provides the control signal to the charging control part.
11. The display apparatus of claim 7 , wherein the light receiving part comprises at least one of a photo thin film transistor and a PIN diode.
12. The display apparatus of claim 7 , wherein the driving signal provided to the light receiving part from the first controller is a direct-current voltage.
13. The display apparatus of claim 8 , wherein the display panel comprises:
a first substrate including a first base substrate, thin film transistors disposed on the first base substrate and pixel electrodes connected to the thin film transistors;
a second substrate disposed opposite the first substrate and including a second base substrate, a color filter disposed on the second base substrate and a common electrode disposed on the second base substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate and which controls an amount of a light transmission through the display panel,
wherein the common electrode and the pixel electrode generate an electric field therebetween.
14. The display apparatus of claim 13 , further comprising a backlight unit which provides the light to the display panel.