# US 12,190,814 B2 · Pixel, display device including the same, and driving method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,190,814 B2 - Document ID: US12190814B2 - Status: Granted - Kind: B2 - Application number: 18/466,973 - Filed: 2023-09-14 - Published: 2024-08-08 - Granted: 2025-01-07 - Earliest claimed: 2023-02-02 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., LTD. - Inventors: Min Woo Byun; Chae Han Hyun - Web page: https://patentgrep.com/patent/US12190814B2 ## CPC - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing - 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 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - 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 A pixel includes a light emitting element, a driving transistor having an electrode electrically connected to an anode electrode of the light emitting element and another electrode electrically connected to a first power source, and controlling a current flowing from the first power source to a second power source, a first transistor electrically connected between a gate electrode of the driving transistor and a reference power source, a second transistor electrically connected between the anode electrode and an initialization power source, a third transistor electrically connected between the gate electrode and a data line, and a fourth transistor and a fifth transistor electrically connected in parallel between the first power source and the another electrode. The fourth transistor compensates a threshold voltage of the driving transistor during a compensation period, and the fifth transistor is turned so that the current is controlled during an emission period. ## Claims ### Claim 1 A pixel comprising: a light emitting element; a driving transistor having an electrode electrically connected to an anode electrode of the light emitting element and another electrode electrically connected to a first power source and controlling a current flowing from the first power source to a second power source through the light emitting element; a first transistor electrically connected between a gate electrode of the driving transistor and a reference power source; a second transistor electrically connected between the anode electrode of the light emitting element and an initialization power source; a third transistor electrically connected between the gate electrode of the driving transistor and a data line; and a fourth transistor and a fifth transistor electrically connected in parallel between the first power source and the another electrode of the driving transistor, wherein the fourth transistor compensates a threshold voltage of the driving transistor by electrically connecting the another electrode of the driving transistor to the first power source during a compensation period, and the fifth transistor is turned so that the current flowing through the light emitting element is controlled according to a control of the driving transistor during an emission period of the light emitting element. ### Claim 2 (depends on 1) The pixel of claim 1, further comprising: a first capacitor electrically connected between the gate electrode of the driving transistor and the anode electrode of the light emitting element; and a second capacitor electrically connected between the first power source and the anode electrode of the light emitting element. ### Claim 3 (depends on 2) The pixel of claim 2, wherein the first transistor is turned on in a first initialization period to initialize the gate electrode of the driving transistor, the second transistor is turned on in the first initialization period to initialize the anode electrode of the light emitting element, and the third transistor is turned on during a data writing period to apply a data voltage to the gate electrode of the driving transistor. ### Claim 4 (depends on 3) The pixel of claim 3, wherein the second transistor is turned on during a second initialization period between the data writing period and the emission period to initialize the anode electrode of the light emitting element. ### Claim 5 (depends on 3) The pixel of claim 3, wherein the light emitting element repeats the emission period and a non-emission period other than the emission period in each of a plurality of emission cycles included in one frame period, each of the plurality of emission cycles includes the emission period, the fifth transistor is turned on in the emission period included in each of the plurality of emission cycles, and the fourth transistor is turned on in a first emission cycle among the plurality of emission cycles and turned off in ones of the plurality of emission cycles other than the first emission cycle. ### Claim 6 (depends on 3) The pixel of claim 3, wherein the light emitting element repeats the emission period and a non-emission period other than the emission period in each of a plurality of emission cycles included in one frame period, each of the plurality of emission cycles includes the emission period, and the first transistor and the third transistor are turned off in each one of the plurality of emission cycles other than a first emission cycle. ### Claim 7 A display device comprising: a pixel; a compensation driver compensating a threshold voltage of a driving transistor included in the pixel by providing a compensation control signal to the pixel; and an emission driver controlling an operation of emitting light from a light emitting element included in the pixel by providing an emission control signal to the pixel, wherein the pixel includes: the driving transistor having an electrode electrically connected to an anode electrode of the light emitting element and another electrode electrically connected to a first power source and controlling a current flowing from the first power source to a second power source through the light emitting element; a first transistor electrically connected between a gate electrode of the driving transistor and a reference power source; a second transistor electrically connected between the anode electrode of the light emitting element and an initialization power source; a third transistor electrically connected between the gate electrode of the driving transistor and a data line; and a fourth transistor and a fifth transistor electrically connected in parallel between the another electrode of the driving transistor and the first power source, the compensation driver provides the compensation control signal to a gate electrode of the fourth transistor among a plurality of emission control transistors in a compensation period, and the emission driver provides the emission control signal to a gate electrode of the fifth transistor among the plurality of emission control transistors in an emission period of the light emitting element. ### Claim 8 (depends on 7) The display device of claim 7, wherein the pixel further includes: a first capacitor electrically connected between the gate electrode of the driving transistor and the anode electrode of the light emitting element; and a second capacitor electrically connected between the first power source and the anode electrode of the light emitting element. ### Claim 9 (depends on 8) The display device of claim 8, further comprising: a first initialization driver providing a first initialization signal to the pixel to initialize the gate electrode of the driving transistor; a second initialization driver providing a second initialization signal to the pixel to initialize the anode electrode of the light emitting element; a data driver applying a data voltage to the pixel; and a scan driver providing a scan signal to the pixel so that the data voltage is applied to the pixel at a time point, wherein the first initialization driver provides the first initialization signal to a gate electrode of the first transistor in a first initialization period, the second initialization driver provides the second initialization signal to a gate electrode of the second transistor in the first initialization period, and the scan driver provides the scan signal to a gate electrode of the third transistor in a data writing period in which the data voltage is applied to the gate electrode of the driving transistor. ### Claim 10 (depends on 9) The display device of claim 9, wherein the second initialization driver provides the second initialization signal to the gate electrode of the second transistor in a second initialization period between the data writing period and the emission period. ### Claim 11 (depends on 9) The display device of claim 9, wherein the light emitting element repeats the emission period and a non-emission period other than the emission period in each of a plurality of emission cycles included in one frame period, each of the plurality of emission cycles includes the emission period, the emission driver provides the emission control signal to the gate electrode of the fifth transistor in the emission period included in each of the plurality of emission cycles, and the compensation driver provides the compensation control signal to the gate electrode of the fourth transistor in the compensation period included in a first emission cycle among the plurality of emission cycles. ### Claim 12 (depends on 9) The display device of claim 9, wherein the light emitting element repeats the emission period and a non-emission period other than the emission period in each of a plurality of emission cycles included in one frame period, each of the plurality of emission cycles includes the emission period, and the first transistor and the third transistor are turned off in each one of the plurality of emission cycles other than a first emission cycle. ### Claim 13 A driving method of a display device including a pixel including a light emitting element and a driving transistor having an electrode electrically connected to an anode electrode of the light emitting element and another electrode electrically connected to a first power source and controlling a current flowing from the first power source to a second power source through the light emitting element, comprising: initializing a gate electrode of the driving transistor; initializing the anode electrode of the light emitting element; compensating a threshold voltage of the driving transistor; applying a data voltage to the gate electrode of the driving transistor; and emitting light from the light emitting element, wherein in the compensating of the threshold voltage of the driving transistor, a compensation control signal is provided to a gate electrode of a fourth transistor among the fourth transistor and a fifth transistor electrically connected in parallel between the another electrode of the driving transistor and the first power source to turn on the fourth transistor, and the threshold voltage of the driving transistor is compensated through the fourth transistor, and in the emitting of light from the light emitting element, an emission control signal is provided to a gate electrode of the fifth transistor to control an operation of emitting light from the light emitting element. ### Claim 14 (depends on 13) The driving method of claim 13, wherein the pixel further includes: a first transistor electrically connected between the gate electrode of the driving transistor and a reference power source; a second transistor electrically connected between the anode electrode of the light emitting element and an initialization power source; a third transistor electrically connected between the gate electrode of the driving transistor and a data line; a first capacitor electrically connected between the gate electrode of the driving transistor and the anode electrode of the light emitting element; and a second capacitor electrically connected between the first power source and the anode electrode of the light emitting element. ### Claim 15 (depends on 14) The driving method of claim 14, wherein the initializing of the gate electrode of the driving transistor includes providing a first initialization signal to a gate electrode of the first transistor to initialize the gate electrode of the driving transistor, the initializing of the anode electrode of the light emitting element includes providing a second initialization signal to a gate electrode of the second transistor to initialize the anode electrode of the light emitting element, and the applying of the data voltage to the gate electrode of the driving transistor includes applying a scan signal to a gate electrode of the third transistor so that the data voltage is applied to the pixel at a time point. ### Claim 16 (depends on 15) The driving method of claim 15, further comprising: providing the second initialization signal to the gate electrode of the second transistor after the applying of the data voltage to the gate electrode of the driving transistor and before the emitting of light from the light emitting element. ### Claim 17 (depends on 15) The driving method of claim 15, wherein the light emitting element repeats an emission period and a non-emission period other than the emission period in each of a plurality of emission cycles included in one frame period, each of the plurality of emission cycles includes the emitting of light from the light emitting element, and only a first emission cycle among the plurality of emission cycles includes the compensating of the threshold voltage of the driving transistor. ### Claim 18 (depends on 17) The driving method of claim 17, wherein each one of the plurality of emission cycles other than the first emission cycle does not include: the initializing of the gate electrode of the driving transistor; the compensating of the threshold voltage of the driving transistor; and the applying of the data voltage to the gate electrode of the driving transistor.