# US 10,872,566 B2 · OLED pixel circuit, driving method for the OLED pixel circuit 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 10,872,566 B2 - Document ID: US10872566B2 - Status: Granted - Kind: B2 - Application number: 15/988,054 - Filed: 2018-05-24 - Published: 2019-06-13 - Granted: 2020-12-22 - Earliest claimed: 2017-12-07 - Assignees: Boe Technology Group Co., Ltd.; Chengdu Boe Optoelectronics Technology Co., Ltd. - Applicants: Boe Technology Group Co., Ltd.; Chengdu BOE Optoelectronics Technology Co., Ltd. - Inventors: Jiawei Qu; Wenjun Liao; Linxuan Li; Taoran Zhang; Qiao Feng; Da Zhou; Zailong Mo; Cailong Zhou - Web page: https://patentgrep.com/patent/US10872566B2 ## CPC - G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - 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 - H10D 64/411: {for FETs} - G09G 2300/0809: Several active elements per pixel in active matrix panels - 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: 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) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract The present disclosure relates to an OLED pixel circuit, a method for driving the same and a display device. The OLED pixel circuit includes: a data writing and compensating circuit configured to make compensation to a threshold voltage of the first driver; the first driver configured to drive the light emitting device after the threshold voltage is compensated; the second driver configured to drive the light emitting device; the light emitting controller connected to the light emitting device and a second signal terminal, and configured to connect the first driver and the second driver to the light emitting device; and the light emitting device emitting light by joint driving of the first driver and the second driver. ## Claims ### Claim 1 An Organic Light Emitting Diode (OLED) pixel circuit, comprising: a data writing and compensation circuit, a light emitting controller, a first driver, a second driver, and a light emitting device; wherein: the data writing and compensating circuit is connected to the first driver, a first signal terminal and a data signal terminal, the data writing and compensating circuit is configured to make compensation to a threshold voltage of the first driver under control of the first signal terminal; the first driver is connected to the light emitting controller and a first voltage terminal, the first driver is configured to drive the light emitting device under control of the first voltage terminal and the light emitting controller after the threshold voltage is compensated; the second driver is connected to the first driver, the light emitting controller and the first voltage terminal, the second driver is configured to drive the light emitting device under control of the first driver, the first voltage terminal and the light emitting controller; the light emitting controller is connected to the light emitting device and a second signal terminal, and the light emitting controller is configured to connect the first driver and the second driver to the light emitting device under control of the second signal terminal; and the light emitting device is connected to a second voltage terminal, and the light emitting device is configured to emit light by joint driving of the first driver and the second driver under control of the second voltage terminal, the first driver comprises a storage capacitor and a first drive transistor; a first terminal of the storage capacitor is connected to the data writing and compensation circuit, and a second terminal of the storage capacitor is connected to the first voltage terminal; a gate electrode of the first driver transistor is connected to the first terminal of the storage capacitor, a first electrode of the first driver transistor is connected to the first voltage terminal, and a second electrode of the first driver transistor is connected to the light emitting controller and the data writing and compensating circuit, the second driver comprises a second driver transistor; and a gate electrode of the second driver transistor is connected to the first terminal of the storage capacitor, a first electrode of the second driver transistor is connected to the first voltage terminal, and a second electrode of the second driver transistor is connected to the light emitting controller. ### Claim 2 (depends on 1) The OLED pixel circuit of claim 1, wherein: the light emitting controller comprises a first transistor and a second transistor; a gate electrode of the first transistor is connected to the second signal terminal, a first electrode of the first transistor is connected to the second electrode of the first driver transistor, and a second electrode of the first transistor is connected to the light emitting device; and a gate electrode of the second transistor is connected to the second signal terminal, a first electrode of the second transistor is connected to the second electrode of the second driver transistor, and a second electrode of the second transistor is connected to the light emitting device. ### Claim 3 (depends on 2) The OLED pixel circuit of claim 2, wherein the first transistor has an aspect ratio which is the same as that of the second transistor. ### Claim 4 (depends on 1) The OLED pixel circuit of claim 1, wherein: the data writing and compensation circuit comprises a third transistor and a fourth transistor; a gate electrode of the third transistor is connected to the first signal terminal, a first electrode of the third transistor is connected to the first terminal of the storage capacitor, and a second electrode of the third transistor is connected to the data signal terminal; and a gate electrode of the fourth transistor is connected to the first signal terminal, a first electrode of the fourth transistor is connected to the first terminal of the storage capacitor, and a second electrode of the fourth transistor is connected to the second electrode of the first driver transistor. ### Claim 5 (depends on 4) The OLED pixel circuit of claim 4, wherein both the third transistor and the fourth transistor have a dual gate structure. ### Claim 6 (depends on 1) The OLED pixel circuit of claim 1, wherein the data signal terminal is a data signal current source which is further connected to a third voltage terminal. ### Claim 7 A display device comprising an Organic Light Emitting Diode (OLED) pixel circuit comprising: a data writing and compensation circuit, a light emitting controller, a first driver, a second driver, and a light emitting device; wherein: the data writing and compensating circuit is connected to the first driver, a first signal terminal and a data signal terminal, the data writing and compensating circuit is configured to make compensation to a threshold voltage of the first driver under control of the first signal terminal; the first driver is connected to the light emitting controller and a first voltage terminal, the first driver is configured to drive the light emitting device under control of the first voltage terminal and the light emitting controller after the threshold voltage is compensated; the second driver is connected to the first driver, the light emitting controller and the first voltage terminal, the second driver is configured to drive the light emitting device under control of the first driver, the first voltage terminal and the light emitting controller; the light emitting controller is connected to the light emitting device and a second signal terminal, the light emitting controller is configured to connect the first driver and the second driver to the light emitting device under control of the second signal terminal; and the light emitting device is connected to a second voltage terminal, the light emitting device is configured to emit light by joint driving of the first driver and the second driver under control of the second voltage terminal, the first driver comprises a storage capacitor and a first drive transistor; a first terminal of the storage capacitor is connected to the data writing and compensation circuit, and a second terminal of the storage capacitor is connected to the first voltage terminal; a gate electrode of the first driver transistor is connected to the first terminal of the storage capacitor, a first electrode of the first driver transistor is connected to the first voltage terminal, and a second electrode of the first driver transistor is connected to the light emitting controller and the data writing and compensating circuit, the second driver comprises a second driver transistor; and a gate electrode of the second driver transistor is connected to the first terminal of the storage capacitor, a first electrode of the second driver transistor is connected to the first voltage terminal, and a second electrode of the second driver transistor is connected to the light emitting controller. ### Claim 8 The display device of 7, wherein: the light emitting controller comprises a first transistor and a second transistor; a gate electrode of the first transistor is connected to the second signal terminal, a first electrode of the first transistor is connected to the second electrode of the first driver transistor, and a second electrode of the first transistor is connected to the light emitting device; and a gate electrode of the second transistor is connected to the second signal terminal, a first electrode of the second transistor is connected to the second electrode of the second driver transistor, and a second electrode of the second transistor is connected to the light emitting device. ### Claim 9 (depends on 8) The display device of claim 8, wherein the first transistor has an aspect ratio which is the same as that of the second transistor. ### Claim 10 (depends on 7) The display device of claim 7, wherein: the data writing and compensation circuit comprises a third transistor and a fourth transistor; a gate electrode of the third transistor is connected to the first signal terminal, a first electrode of the third transistor is connected to the first terminal of the storage capacitor, and a second electrode of the third transistor is connected to the data signal terminal; and a gate electrode of the fourth transistor is connected to the first signal terminal, a first electrode of the fourth transistor is connected to the first terminal of the storage capacitor, and a second electrode of the fourth transistor is connected to the second electrode of the first driver transistor. ### Claim 11 (depends on 10) The display device of claim 10, wherein both the third transistor and the fourth transistor have a dual gate structure. ### Claim 12 (depends on 7) The display device of claim 7, wherein the data signal terminal is a data signal current source which is further connected to a third voltage terminal. ### Claim 13 A method for driving an Organic Light Emitting Diode (OLED) pixel circuit, comprising: in a data writing and compensation stage of a frame, making compensation by a data writing and compensation circuit to a threshold voltage of a first driver under control of a first signal terminal; and in a light emitting stage of the frame, enabling by a light emitting controller the first driver and a second driver to be connected to a light emitting device under control of a second signal terminal, and emitting light by the light emitting device by joint driving of the first driver and the second driver under control of the second voltage terminal,. the first driver comprises a storage capacitor and a first drive transistor; a first terminal of the storage capacitor is connected to the data writing and compensation circuit, and a second terminal of the storage capacitor is connected to the first voltage terminal; a gate electrode of the first driver transistor is connected to the first terminal of the storage capacitor, a first electrode of the first driver transistor is connected to the first voltage terminal, and a second electrode of the first driver transistor is connected to the light emitting controller and the data writing and compensating circuit, the second driver comprises a second driver transistor; and a gate electrode of the second driver transistor is connected to the first terminal of the storage capacitor, a first electrode of the second driver transistor is connected to the first voltage terminal, and a second electrode of the second driver transistor is connected to the light emitting controller.