LIGHT SENSING CIRCUIT, TOUCH PANEL INCLUDING THE SAME, AND METHOD OF DRIVING THE SAME
First Claim
1. A light sensing circuit for amplifying a current of a photodiode, comprising:
- a photodiode comprising a cathode electrode and an anode electrode and for receiving light from the outside and generating a current corresponding to the received light;
a driving transistor for amplifying the current generated in the photodiode;
a capacitor for storing a first initiation voltage transmitted to the driving transistor;
a first switching transistor for compensating for a threshold voltage of the driving transistor corresponding to a current scan signal; and
a second switching transistor for transmitting the first initiation voltage corresponding to the current scan signal.
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Accused Products
Abstract
A light sensing circuit includes a photodiode including a cathode electrode and an anode electrode and for receiving light from the outside and generating a current corresponding to the received light, a driving transistor for amplifying the current generated in the photodiode, a capacitor for storing a first initiation voltage transmitted to the driving transistor, a first switching transistor for compensating for a threshold voltage of the driving transistor corresponding to a current scan signal, and a second switching transistor for transmitting the first initiation voltage corresponding to the current scan signal.
62 Citations
20 Claims
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1. A light sensing circuit for amplifying a current of a photodiode, comprising:
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a photodiode comprising a cathode electrode and an anode electrode and for receiving light from the outside and generating a current corresponding to the received light; a driving transistor for amplifying the current generated in the photodiode; a capacitor for storing a first initiation voltage transmitted to the driving transistor; a first switching transistor for compensating for a threshold voltage of the driving transistor corresponding to a current scan signal; and a second switching transistor for transmitting the first initiation voltage corresponding to the current scan signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. (canceled)
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12. A touch panel comprising a pixel driving circuit for driving a plurality of pixels for displaying images and a light sensing circuit for detecting a touch, wherein the light sensing circuit comprises a photodiode comprising a cathode electrode and an anode electrode and for receiving light from the outside and generating a current corresponding to the received light;
- a driving transistor for amplifying the current generated in the photodiode;
a capacitor for storing a first initiation voltage transmitted to the driving transistor;
a first switching transistor for compensating for a threshold voltage of the driving transistor corresponding to a current scan signal; and
a second switching transistor for transmitting the first initiation voltage corresponding to the current scan signal. - View Dependent Claims (13, 14, 15, 16, 17, 18)
- a driving transistor for amplifying the current generated in the photodiode;
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19. A method of driving a light sensing circuit, the method comprising:
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initiating a voltage of a gate electrode of a driving transistor and a voltage of a cathode electrode of a photodiode corresponding to a previous scan signal; diode connecting the driving transistor and storing a first initiation voltage transmitted to the driving transistor to a capacitor corresponding to a current scan signal; applying a power source voltage to a source electrode of the driving transistor corresponding to an emission signal and adjusting the first initiation voltage stored in the capacitor corresponding to a current generated in the photodiode; and amplifying the current generated in the photodiode and outputting the amplified current corresponding to a light integration signal. - View Dependent Claims (20)
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Specification