# US 2021/0241687 A1 · Pixel compensation circuit, driving method, and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0241687 A1 - Document ID: US20210241687A1 - Status: Published application - Kind: A1 - Application number: 16/631,487 - Filed: 2019-05-17 - Published: 2021-08-05 - Earliest claimed: 2019-04-28 - Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. - Inventors: Yan XIE - Web page: https://patentgrep.com/patent/US20210241687A1 ## 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 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements - 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 2300/0861: 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 2310/0262: The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes - G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements - 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 compensation circuit is provided. The pixel compensation circuit includes: a first transistor connected to a first scan line, wherein a first terminal of the first transistor is connected to a data line and a second terminal of the first transistor is connected to a second terminal of the driving transistor; a second transistor connected to a first scan line, wherein a first terminal of the second transistor is connected to a first terminal of the driving transistor and a second terminal of the second transistor is connected to a control terminal of the driving transistor; and a third transistor, wherein a control terminal of the third transistor is connected to a control line, a first terminal of the third transistor is connected to a supply voltage line, and a second terminal of the third transistor is connected to the first terminal of the driving transistor. ## Claims ### Claim 1 A pixel compensation circuit, comprising: a light-emitting element, wherein a first terminal of the light-emitting element is connected to a common voltage line; a driving transistor configured to drive the light-emitting element to emit light; a first transistor, wherein a control terminal of the first transistor is connected to a first scan line, a first terminal of the first transistor is connected to a data line, and a second terminal of the first transistor is connected to a second terminal of the driving transistor; a second transistor, wherein a control terminal of the second transistor is connected to the first scan line, a first terminal of the second transistor is connected to a first terminal of the driving transistor, and a second terminal of the second transistor is connected to a control terminal of the driving transistor; a third transistor, wherein a control terminal of the third transistor is connected to a control line, a first terminal of the third transistor is connected to a supply voltage line, a second terminal of the third transistor is connected to the first terminal of the driving transistor; a fourth transistor, wherein a control terminal of the fourth transistor is connected to the control line, a first terminal of the fourth transistor is connected to the second terminal of the driving transistor, and a second terminal of the fourth transistor is connected to a second terminal of the light-emitting element; and a storage capacitor, wherein a first terminal of the storage capacitor is connected to the supply voltage line, a second terminal of the storage capacitor, the second terminal of the second transistor, and the control terminal of the driving transistor are connected to a third node. ### Claim 2 (depends on 1) The pixel compensation circuit of claim 1, wherein the pixel compensation circuit further comprises a fifth transistor, wherein a control terminal of the fifth transistor is connected to a second scan line, the second scan line provides a second scan signal to the control terminal of the fifth transistor, and the fifth transistor is configured to be turned on under control of the second scan signal to pull down an electric potential at the control terminal of the driving transistor to a low electric potential. ### Claim 3 (depends on 2) The pixel compensation circuit of claim 2, wherein a first terminal of the fifth transistor is connected to a first reset voltage line, and a second terminal of the fifth transistor is connected to the control terminal of the driving transistor. ### Claim 4 (depends on 1) The pixel compensation circuit of claim 1, wherein the pixel compensation circuit further comprises a sixth transistor, wherein a control terminal of the sixth transistor is connected to a third scan line, the third scan line provides a third scan signal to the sixth transistor, and the sixth transistor is configured to be turned on under control of the third scan signal to pull down an electric potential at the second terminal of the light-emitting element to a low electric potential. ### Claim 5 (depends on 4) The pixel compensation circuit of claim 4, wherein a first terminal of the sixth transistor is connected to a second reset line, and a second terminal of the sixth transistor is connected to the second terminal of the light-emitting element. ### Claim 6 (depends on 4) The pixel compensation circuit of claim 4, wherein a supply voltage provided by the supply voltage line is larger than a common voltage provided by the common voltage line. ### Claim 7 (depends on 4) The pixel compensation circuit of claim 4, wherein the first transistor, the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the driving transistor are all thin film field effect transistors. ### Claim 8 A driving method for a pixel compensation circuit, comprising: at a first stage, turning on a fifth transistor and a sixth transistor, turning off a first transistor, a second transistor, a third transistor, a fourth transistor, and a driving transistor, resetting a control terminal of the driving transistor to a first reset voltage, and resetting a second terminal of a light-emitting element to a second reset voltage; at a second stage, turning on the first transistor, the second transistor, and the driving transistor, turning off the fifth transistor and the sixth transistor, and providing a data signal voltage to a first terminal of the first transistor through a data line, wherein at this time, a voltage at the control terminal of the driving transistor is a sum of the data signal voltage and a threshold voltage of the driving transistor, and a voltage stored by the storage capacitor is equal to the threshold voltage of the driving transistor; and at a third stage, turning on the third transistor and the fourth transistor, turning off the first transistor and the second transistor, and driving the light-emitting element to emit light by the driving transistor. ### Claim 9 (depends on 8) The driving method for the pixel compensation circuit of claim 8, wherein when a first scan signal provided by a first scan line is at a low level, the first transistor and the second transistor are controlled to be turned on, and when the first scan signal is at a high level, and the first transistor and the second transistor are controlled to be turned off; when a control signal provided by a control line is at a low level, the third transistor and fourth transistor are controlled to be turned on, and when the control signal is at a high level, the third transistor and the fourth transistor are controlled to be turned off; when a second scan signal is at a low level, the fifth transistor is controlled to be turned on, and when the second scan signal is at a high level, the fifth transistor is controlled to be turned off; and when a third scan signal is at a low level, the sixth transistor is controlled to be turned on, and when the third scan signal is at a high level, the sixth transistor is controlled to be turned off. ### Claim 10 (depends on 1) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 1; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit. ### Claim 11 (depends on 2) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 2; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit. ### Claim 12 (depends on 3) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 3; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit. ### Claim 13 (depends on 4) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 4; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit. ### Claim 14 (depends on 5) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 5; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit. ### Claim 15 (depends on 6) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 6; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit. ### Claim 16 (depends on 7) A display device, comprising: a plurality of pixel units, wherein each of the pixel units comprises the pixel compensation circuit of claim 7; a scan driving circuit configured to provide a scan signal for the pixel compensation circuit; a data driving circuit configured to provide a data signal voltage for the pixel compensation circuit; and a control driving circuit configured a control signal for the pixel compensation circuit.