# US 11,443,545 B2 · Sensor pixel circuit and sensor device comprising the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,545 B2 - Document ID: US11443545B2 - Status: Granted - Kind: B2 - Application number: 17/105,741 - Filed: 2020-11-27 - Published: 2021-06-10 - Granted: 2022-09-13 - Earliest claimed: 2019-12-06 - Assignees: Silicon Display Technology - Applicants: Silicon Display Technology - Inventors: Jong Woo Jin; Jin Hyeong Yu; Youn Duck Nam - Web page: https://patentgrep.com/patent/US11443545B2 ## CPC - G06V 40/1306: {non-optical, e.g. ultrasonic or capacitive sensing} - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract A sensor pixel circuit may include: a photodiode to which a current flows according to incident light; a storage capacitor connected in parallel to the photodiode; a first transistor for connecting a bias voltage and the photodiode by a contact of a recognition object; and a second transistor for transmitting charges stored in the storage capacitor to a data line. ## Claims ### Claim 1 A sensor pixel circuit comprising: a photodiode to which a current flows according to incident light; a storage capacitor connected in parallel to the photodiode; a first transistor for connecting a bias voltage and the photodiode by a contact of a recognition object; and a second transistor for transmitting charges stored in the storage capacitor to a data line. ### Claim 2 (depends on 1) The sensor pixel circuit of claim 1, wherein the first transistor includes a first end connected to an anode of the photodiode and a second end for receiving the bias voltage, a sensing electrode connected to a control end of the first transistor is further included, and the sensing electrode and the recognition object forms a sensing capacitor by a contact of the recognition object. ### Claim 3 (depends on 2) The sensor pixel circuit of claim 2, further comprising a third transistor for resetting a voltage at a first node on which the first end of the first transistor is connected to an anode of the photodiode with a reset voltage for making the photodiode an open circuit. ### Claim 4 (depends on 3) The sensor pixel circuit of claim 3, wherein the third transistor includes a first end connected to the first node and a second end for receiving the reset voltage, and the current flowing to the photodiode is charged in the storage capacitor by a contact of the recognition object for a period from a turn-off time of the third transistor to a turn-on time of the second transistor after the turn-off time of the third transistor. ### Claim 5 (depends on 2) The sensor pixel circuit of claim 2, further comprising a fourth transistor for resetting a voltage at a second node on which a control end of the first transistor is connected to the sensing electrode. ### Claim 6 (depends on 5) The sensor pixel circuit of claim 5, wherein the fourth transistor includes a first end connected to the second node and a second end for receiving a reset voltage, and for an On period of the fourth transistor, the second node becomes the reset voltage, and the first transistor is switched according to a pulse signal supplied to the recognition object by a contact of the recognition object. ### Claim 7 (depends on 6) The sensor pixel circuit of claim 6, wherein when the reset voltage is an On level voltage of the first transistor, the second node is reset with the reset voltage, and the pulse signal is changed to a level for turning off the first transistor. ### Claim 8 (depends on 6) The sensor pixel circuit of claim 6, wherein when the reset voltage is an Off level voltage of the first transistor, the second node is reset with the reset voltage, and the pulse signal is changed to a level for turning on the first transistor. ### Claim 9 (depends on 5) The sensor pixel circuit of claim 5, further comprising a first storage capacitor including a first electrode connected to the second node and a second electrode for receiving a DC voltage. ### Claim 10 (depends on 5) The sensor pixel circuit of claim 5, further comprising a coupling capacitor including a first electrode connected to the second node and a second electrode for receiving a pulse signal. ### Claim 11 (depends on 10) The sensor pixel circuit of claim 10, wherein the fourth transistor includes a first end connected to the second node, and a second end for receiving a reset voltage, and for an On period of the fourth transistor, the second node becomes the reset voltage and the first transistor is switched according to the pulse signal. ### Claim 12 (depends on 11) The sensor pixel circuit of claim 11, wherein when the reset voltage has an On level voltage of the first transistor, the second node is reset with the reset voltage, and the pulse signal is changed to a level for turning off the first transistor. ### Claim 13 (depends on 11) The sensor pixel circuit of claim 11, wherein when the reset voltage is an Off level voltage of the first transistor, the second node is reset with the reset voltage, and the pulse signal is changed to a level for turning on the first transistor. ### Claim 14 A sensor device comprising: a sensor panel including a plurality of sensor pixels; a gate driving circuit for supplying a scan signal to a plurality of sensor pixel rows through a plurality of scan lines; and a sensor signal lead out circuit for receiving a plurality of data signals supplied from the sensor pixels through a plurality of data lines, wherein one sensor pixel circuit of the sensor pixels includes a photodiode to which a current flows according to incident light, a storage capacitor connected in parallel to the photodiode, a first transistor for connecting a bias voltage and the photodiode by a contact of a recognition object, and a second transistor synchronized with a scan signal transmitted through a corresponding one of the scan lines and transmitting charges stored in the storage capacitor to a corresponding one of the data lines. ### Claim 15 (depends on 14) The sensor device of claim 14, wherein the sensor pixel circuit further includes a third transistor for resetting a voltage at a second node on which a control end of the first transistor is connected to the sensing electrode, and a coupling capacitor including a first electrode connected to the second node and a second electrode for receiving a pulse signal. ### Claim 16 (depends on 15) The sensor device of claim 15, further comprising a plurality of pulse signal lines for supplying corresponding pulse signals to the respective sensor pixel rows.