# US 12,223,902 B2 · Pixels, display device comprising pixels, and driving method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,223,902 B2 - Document ID: US12223902B2 - Status: Granted - Kind: B2 - Application number: 18/518,607 - Filed: 2023-11-24 - Published: 2024-03-14 - Granted: 2025-02-11 - Earliest claimed: 2019-05-08 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Il Hun Jeong - Web page: https://patentgrep.com/patent/US12223902B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - 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 2300/0852: being a dynamic memory with more than one capacitor - G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes - G09G 2310/0251: Precharge or discharge of pixel before applying new pixel voltage - G09G 2310/0254: Control of polarity reversal in general, other than for liquid crystal displays - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - 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) ## Abstract In a pixel, a display device including a pixel, and a method of driving the display device, the pixel includes a first transistor connected to a first power source, a fourth node and a first node, a second transistor connected to a third node, a data line and an i-th first scan line, a third transistor connected to the first node, the fourth node, and an i-th third scan line, a fourth transistor connected to the second node, an initialization voltage, and an i-th second scan line, a first capacitor connected between the third node and the first node, a second capacitor connected between the first node and the second node, and an organic light emitting diode connected between the second node and a second power source, wherein I is a natural number and the third transistor is an N-type transistor. ## Claims ### Claim 1 A pixel comprising: a first transistor electrically connected between a first power source and a fourth node, and including a gate electrode electrically connected to a first node; a second transistor electrically connected between a third node and a data line, and turned on in response to a scan signal of a first polarity applied to a first scan line; a third transistor electrically connected between the first node and the fourth node, and turned on in response to a scan signal of a second polarity applied to a third scan line, wherein the second polarity is opposite to the first polarity; a fourth transistor electrically connected between a second node and an initialization voltage, and turned on in response to a scan signal applied to a second scan line; a light emitting diode connected between the second node and a second power source and including an anode electrode electrically connected to the second node; a first capacitor connected between the third node and the first node; and a second capacitor connected between the first node and the second node. ### Claim 2 (depends on 1) The pixel of claim 1, wherein the fourth transistor is turned on in response to the scan signal of the first polarity applied to the third scan line. ### Claim 3 (depends on 1) The pixel of claim 1, wherein the fourth transistor is turned on in response to the scan signal of the second polarity applied to the third scan line. ### Claim 4 (depends on 1) The pixel of claim 1, wherein the first polarity is a low level, and the second polarity is a high level. ### Claim 5 (depends on 1) The pixel of claim 1, wherein the second scan line is an i-th second scan line, and the third scan line is an i-th third scan line, where i is a natural number, and wherein the i-th second scan line is the same scan line as an (i+1)-th third scan line. ### Claim 6 (depends on 1) The pixel of claim 1, wherein the first scan line is an i-th first scan line, and the second scan line is an i-th second scan line, where i is a natural number, and wherein the i-th second scan line is the same scan line as an (i+1)-th first scan line. ### Claim 7 (depends on 1) The pixel of claim 1, further comprising: a fifth transistor electrically connected between a reference voltage and the third node and turned on in response to a light emission signal applied to a light emission control line. ### Claim 8 (depends on 1) The pixel of claim 1, further comprising: a sixth transistor electrically connected between the fourth node and the second node and turned on in response to a light emission signal applied to a light emission control line. ### Claim 9 (depends on 1) The pixel of claim 1, wherein the second transistor and the third transistor are turned on during a first period, and the fourth transistor is turned on during a second period subsequent to the first period. ### Claim 10 A pixel comprising: a first transistor electrically connected between a first power source and a fourth node, and including a gate electrode electrically connected to a first node; a second transistor electrically connected between a third node and a data line, and turned on in response to a scan signal of a first polarity applied to a first scan line; a third transistor electrically connected between the first node and the fourth node, and turned on in response to the scan signal of the first polarity applied to a third scan line; a fourth transistor electrically connected between a second node and an initialization voltage, and turned on in response to a scan signal applied to a second scan line; a light emitting diode connected between the second node and a second power source and including an anode electrode electrically connected to the second node; a first capacitor connected between the third node and the first node; and a second capacitor connected between the first node and the second node. ### Claim 11 (depends on 10) The pixel of claim 10, wherein the first polarity is a high level. ### Claim 12 (depends on 11) The pixel of claim 11, wherein the fourth transistor is turned on in response to a scan signal of a second polarity applied to the third scan line. ### Claim 13 (depends on 12) The pixel of claim 12, wherein the second polarity is a low level. ### Claim 14 (depends on 10) The pixel of claim 10, wherein the first scan line is the same as the third scan line. ### Claim 15 (depends on 14) The pixel of claim 14, wherein the second scan line is an i-th second scan line, and the third scan line is an i-th third scan line, where i is a natural number, and wherein the i-th second scan line is the same as an (i+1)-th third scan line. ### Claim 16 A driving method of a pixel, wherein the pixel comprises: a first transistor electrically connected between a first power source and a fourth node, and including a gate electrode electrically connected to a first node; a second transistor electrically connected between a third node and a data line, and turned on in response to a scan signal of a first polarity applied to a first scan line; a third transistor electrically connected between the first node and the fourth node, and turned on in response to a scan signal of a second polarity applied to a third scan line; a fourth transistor electrically connected between a second node and an initialization voltage, and turned on in response to a scan signal applied to a second scan line; a light emitting diode connected between the second node and a second power source and including an anode electrode electrically connected to the second node; a first capacitor connected between the third node and the first node; and a second capacitor connected between the first node and the second node, and wherein the driving method of the pixel comprises: turning on the second transistor and the third transistor during a first period; and turning on the fourth transistor during a second period subsequent to the first period. ### Claim 17 (depends on 16) The driving method of claim 16, wherein the first polarity is the same as the second polarity. ### Claim 18 (depends on 17) The driving method of claim 17, wherein each of the first polarity and the second polarity is a high level. ### Claim 19 (depends on 16) The driving method of claim 16, wherein the first polarity is opposite to the second polarity. ### Claim 20 (depends on 19) The driving method of claim 19, wherein the first polarity is a high level, and the second polarity is a low level.