Photo sensor, display device including the same and driving method thereof
View Patent ↗Provided are a photo sensor, a display device including the same, and a driving method thereof. The photo sensor includes: an amplifying element including an input terminal coupled to a scan line for receiving a scan signal, an output terminal configured to output a sensing signal, and a control terminal connected to a first node; a sensing capacitor connected with the first node; a photosensitive sensing element including a control terminal connected with a terminal of a first control signal, an output terminal connected with the first node, and an input terminal; and a reset element connected with the output terminal of the amplifying element and resetting the output terminal of the amplifying element to second voltage according to a reset control signal.
1. A photo sensor, comprising:
an amplifying element including an input terminal coupled to a scan line for receiving a scan signal, an output terminal configured to output a sensing signal, and a control terminal connected to a first node;
a sensing capacitor connected with the first node;
a sensing element including a control terminal connected with a terminal of a first control signal, an output terminal connected with the first node, and an input terminal; and
a reset element connected with the output terminal of the amplifying element and resetting the output terminal of the amplifying element to a first voltage according to a reset control signal.
2. The photo sensor of claim 1 , wherein:
the scan signal includes a low voltage pulse which is outputted once for one frame, and
the first control signal includes a high voltage pulse which is outputted once for one frame.
3. The photo sensor of claim 2 , wherein:
the reset element includes an input terminal configured to receive the first voltage, an output terminal connected with the output terminal of the amplifying element, and a control terminal configured to receive the reset control signal.
4. The photo sensor of claim 3 , wherein:
the reset control signal includes a high voltage pulse configured to be received by the control terminal of the reset element at a time between the low voltage pulse of the scan signal and the high voltage pulse of the first control signal.
5. The photo sensor of claim 4 , wherein:
the input terminal of the sensing element is configured to receive a second voltage.
6. The photo sensor of claim 4 , wherein:
the input terminal and the control terminal of the sensing element are connected to each other so as to each receive the first control signal.
7. A display device, comprising:
a scan signal line configured to transmit a scan signal;
a sensing signal line configured to transmit a sensing signal;
an amplifying element including an input terminal connected with the scan signal line, an output terminal connected with the sensing signal line, and a control terminal connected to a first node;
a sensing capacitor connected with the first node,
a sensing element including a control terminal connected with a terminal of a first control signal, an output terminal connected with the first node, and an input terminal; and
a reset element connected with the sensing signal line and resetting the sensing signal line to a first voltage according to a reset control signal.
8. The display device of claim 7 , wherein:
the scan signal includes a low voltage pulse which is outputted once for one frame, and
the first control signal includes a high voltage pulse which is outputted once for one frame.
9. The display device of claim 8 , wherein:
the reset element includes an input terminal configured to receive the first voltage, an output terminal connected with the sensing signal line, and a control terminal configured to receive the a reset control signal.
10. The display device of claim 9 , wherein:
the reset control signal includes a high voltage pulse configured to be received by the control terminal of the reset element at a time between that of the low voltage pulse of the scan signal and that of the high voltage pulse of the first control signal.
11. The display device of claim 10 , wherein:
the input terminal of the sensing element is configured to receive a second voltage.
12. The display device of claim 10 , wherein:
the input terminal and the control terminal of the sensing element are connected to each other so as to each receive the first control signal.
13. The display device of claim 12 , further comprising:
a sensing signal processor connected with the sensing signal line and configured to generate touch information.
14. A method of driving a photo sensor including an amplifying element with a control terminal connected to a first node, a sensing capacitor connected with the first node, a sensing element with an output terminal connected with the first node, and a reset element connected with the output terminal of the amplifying element, the method comprising:
applying a high voltage pulse of a first control signal to a control terminal of the sensing element to charge the first node at a predetermined voltage;
applying a low voltage of the first control signal to the control terminal of the sensing element to sense light;
applying a low voltage pulse of a scan signal to an input terminal of the amplifying element so as to generate differing voltages at the output terminal of the amplifying element according to whether the sensing element is being irradiated by light or not;
applying a high voltage of the scan signal to the input terminal of the amplifying element to output a sensing signal from the output terminal of the amplifying element; and
applying a high voltage pulse of a reset control signal to a control terminal of the reset element to reset a voltage level of the output terminal of the amplifying element.
15. The method of claim 14 , wherein:
the low voltage pulse of the scan signal is outputted once for one frame, and
the high voltage pulse of the first control signal is outputted once for one frame.
16. The method of claim 15 , wherein:
the input terminal of the sensing element is connected to a terminal configured to receive a first voltage.
17. The method of claim 15 , wherein:
the input terminal and the control terminal of the sensing element are connected to each other so as to each receive the first control signal.
18. The method of claim 17 , wherein:
the high voltage pulse of the reset control signal is applied once every 1 horizontal period.
19. The method of claim 14 , wherein:
the input terminal of the sensing element is connected to a terminal of a first voltage.
20. The method of claim 14 , wherein:
the input terminal and the control terminal of the sensing element are connected to each other so as to each receive the first control signal.