# US 12,217,685 B2 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,217,685 B2 - Document ID: US12217685B2 - Status: Granted - Kind: B2 - Application number: 18/450,786 - Filed: 2023-08-16 - Published: 2024-04-04 - Granted: 2025-02-04 - Earliest claimed: 2022-10-04 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Heerim Song; Cheol-Gon Lee; Mukyung Jeon - Web page: https://patentgrep.com/patent/US12217685B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 3/042: by opto-electronic means - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06V 40/1318: {using electro-optical elements or layers, e.g. electroluminescent sensing} - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2354/00: Aspects of interface with display user - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract A display device includes a plurality of pixels, each of which includes a light emitting element and a pixel driving circuit and a plurality of sensors, each of which includes a light receiving element and a sensor driving circuit. A sensor driving circuit included in at least one of sensors includes a reset transistor configured to output a reset signal to a first sensing node in response to a reset control signal, an amplification transistor connected to first and second sensing nodes and configured to receive a sensor driving voltage, a first output transistor connected between the second sensing node and a readout line and configured to receive a first output control signal, and a second output transistor connected between the second sensing node and the readout line and configured to receive a second output control signal. ## Claims ### Claim 1 A display device comprising: a plurality of pixels, each of which includes a light emitting element and a pixel driving circuit connected to the light emitting element; and a plurality of sensors, each of which includes a light receiving element and a sensor driving circuit connected to the light receiving element, wherein the sensor driving circuit included in at least one sensor from among the sensors includes: a reset transistor including a first electrode configured to receive a reset signal, a second electrode connected to a first sensing node, and a third electrode configured to receive a reset control signal; an amplification transistor including a first electrode configured to receive a sensor driving voltage, a second electrode connected to the first sensing node, and a third electrode connected to a second sensing node; a first output transistor including a first electrode connected to the second sensing node, a second electrode connected to a readout line, and a third electrode configured to receive a first output control signal; and a second output transistor including a first electrode connected to the second sensing node, a second electrode connected to the readout line, and a third electrode configured to receive a second output control signal. ### Claim 2 (depends on 1) The display device of claim 1, wherein the first output control signal includes a first active period in which the first output transistor is turned on, wherein the second output control signal includes a second active period in which the second output transistor is turned on, and wherein the first active period and the second active period do not overlap each other. ### Claim 3 (depends on 1) The display device of claim 1, wherein sensor driving circuits respectively included in the sensors have a same configuration. ### Claim 4 (depends on 1) The display device of claim 1, wherein a first sensor from among the sensors includes a first sensor driving circuit having a first circuit configuration, and wherein a second sensor from among the sensors includes a second sensor driving circuit having a second circuit configuration different from the first circuit configuration. ### Claim 5 (depends on 4) The display device of claim 4, wherein the first sensor driving circuit includes the reset transistor, the amplification transistor, and the first output transistor, and wherein the second sensor driving circuit includes the reset transistor, the amplification transistor, the first output transistor, and the second output transistor. ### Claim 6 (depends on 5) The display device of claim 5, wherein the sensors are arranged in a first direction and a second direction crossing the first direction, wherein ‘k−1’ first sensors are positioned between two second sensors adjacent to each other in the first direction, and wherein the ‘k’ is an integer that is not less than 2. ### Claim 7 (depends on 1) The display device of claim 1, wherein the pixel driving circuit includes: a first transistor connected between a first driving voltage line configured to receive a first driving voltage and the light emitting element; a second transistor connected between a data line and a first electrode of the first transistor; and a third transistor connected between a second electrode of the first transistor and a first node and configured to receive a first scan signal. ### Claim 8 (depends on 7) The display device of claim 7, wherein the pixel driving circuit further includes: a fourth transistor connected between a first initialization line, to which a first initialization voltage is applied, and the first node and configured to receive a second scan signal; and a fifth transistor connected between a second initialization line, to which a second initialization voltage is applied, and the light emitting element and configured to receive a third scan signal. ### Claim 9 (depends on 8) The display device of claim 8, wherein the first output transistor is configured to receive one of the first scan signal, the second scan signal, and the third scan signal as the first output control signal. ### Claim 10 (depends on 8) The display device of claim 8, further comprising: a pixel scan driver configured to output the first scan signal, the second scan signal, and the third scan signal; and a touch scan driver configured to output a touch scan signal sequentially, wherein the second output transistor is configured to receive the touch scan signal as the second output control signal. ### Claim 11 (depends on 10) The display device of claim 10, wherein the pixel scan driver includes ‘n’ driving stages, wherein the touch scan driver includes ‘n’ touch stages, and wherein the ‘n’ is an integer that is not less than 2. ### Claim 12 (depends on 10) The display device of claim 10, wherein the pixel scan driver includes ‘n’ driving stages, wherein the touch scan driver includes ‘p’ touch stages, and wherein the ‘p’ is an integer that is not less than 2, and the ‘n’ is an integer greater than the ‘p’. ### Claim 13 (depends on 1) The display device of claim 1, wherein the reset transistor and the first output transistor are transistors having different types from each other, and wherein the first output transistor and the second output transistor are transistors having the same types as each other. ### Claim 14 (depends on 1) The display device of claim 1, wherein the first output transistor and the second output transistor are transistors having different types from each other, and wherein the reset transistor and the second output transistor are transistors having the same types as each other. ### Claim 15 A display device comprising: a display panel including: a base layer; a circuit layer on the base layer; and an element layer on the circuit layer and including a plurality of light emitting elements and a plurality of light receiving elements, wherein the circuit layer includes a plurality of pixel driving circuits connected to the plurality of light emitting elements and a plurality of sensor driving circuits connected to the plurality of light receiving elements, and wherein at least one of the plurality of sensor driving circuits includes: a reset transistor including a first electrode configured to receive a reset signal, a second electrode connected to a first sensing node, and a third electrode configured to receive a reset control signal; an amplification transistor including a first electrode configured to receive a sensor driving voltage, a second electrode connected to the first sensing node, and a third electrode connected to a second sensing node; a first output transistor including a first electrode connected to the second sensing node, a second electrode connected to a readout line, and a third electrode configured to receive a first output control signal; and a second output transistor including a first electrode connected to the second sensing node, a second electrode connected to the readout line, and a third electrode configured to receive a second output control signal. ### Claim 16 (depends on 15) The display device of claim 15, further comprising: a pixel scan driver electrically connected to the plurality of pixel driving circuits; and a touch scan driver electrically connected to the plurality of sensor driving circuits. ### Claim 17 (depends on 16) The display device of claim 16, wherein the plurality of sensor driving circuits include: a first sensor driving circuit having a first circuit configuration; and a second sensor driving circuit having a second circuit configuration different from the first circuit configuration. ### Claim 18 (depends on 17) The display device of claim 17, wherein the display panel includes ‘p’ touch sensing areas, wherein the pixel scan driver includes ‘n’ driving stages, wherein the touch scan driver includes ‘p’ touch stages, wherein the ‘p’ touch stages are respectively arranged to correspond to the ‘p’ touch sensing areas, and wherein the ‘p’ is an integer that is not less than 2, and the ‘n’ is an integer greater than the ‘p’. ### Claim 19 (depends on 17) The display device of claim 17, wherein the display panel includes “p×q” touch sensing areas, wherein the “p×q” touch sensing areas are arranged in a matrix form in a first direction and a second direction, wherein a plurality of first sensors and at least one second sensor are arranged in each of the “p×q” touch sensing areas, and wherein each of the ‘p’ and the ‘q’ is an integer that is not less than 2. ### Claim 20 (depends on 17) The display device of claim 17, wherein the first sensor driving circuit includes the reset transistor, the amplification transistor, and the first output transistor, and wherein the second sensor driving circuit includes the reset transistor, the amplification transistor, the first output transistor, and the second output transistor.