# US 10,872,569 B2 · Compensation method for pixel circuit, 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 10,872,569 B2 - Document ID: US10872569B2 - Status: Granted - Kind: B2 - Application number: 16/452,981 - Filed: 2019-06-26 - Published: 2020-02-27 - Granted: 2020-12-22 - Earliest claimed: 2018-08-21 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Song Meng - Web page: https://patentgrep.com/patent/US10872569B2 ## CPC - G09G 3/3225: using an active matrix - 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 3/3275: Details of drivers for data electrodes - 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 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel - 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 The present disclosure provides a compensation method for pixel circuit, a pixel circuit, and a display device. The pixel circuit includes a data writing circuit, a driving circuit, a sensing circuit, and an energy storage circuit, the compensation method includes: in a charging stage, acquiring a voltage of the second node by the sensing circuit, adjusting a data voltage outputted by the data writing circuit to the first node based on the acquired voltage of the second node, and charging the energy storage circuit by using the adjusted data voltage; and in a compensation stage, compensating characteristic parameters of the driving circuit by the charged energy storage circuit. ## Claims ### Claim 1 A compensation method for pixel circuit, wherein the pixel circuit comprises a data writing circuit, a driving circuit, a sensing circuit, and an energy storage circuit, the data writing circuit is coupled, at a first node, to a first terminal of the driving circuit and a first terminal of the energy storage circuit, the sensing circuit is coupled, at a second node, to a second terminal of the driving circuit and a second terminal of the energy storage circuit, the compensation method comprising: in a charging stage, acquiring a voltage of the second node by the sensing circuit, adjusting a data voltage outputted by the data writing circuit to the first node based on the acquired voltage of the second node, and charging the energy storage circuit by using the adjusted data voltage; and in a compensation stage, compensating characteristic parameters of the driving circuit by the charged energy storage circuit, wherein the charging stage comprises a measurement charging cycle; and the step of acquiring a voltage of the second node by the sensing circuit, adjusting the data voltage outputted by the data writing circuit to the first node based on the acquired voltage of the second node comprises: in the measurement charging cycle, outputting a predetermined data voltage to the first node by the data writing circuit, and acquiring the voltage of the second node by the sensing circuit; and determining a measurement charging slope based on the measurement charging cycle and the acquired voltage of the second node, and obtaining the adjusted data voltage according to the determined measurement charging slope. ### Claim 2 (depends on 1) The compensation method according to claim 1, wherein, in the charging stage, the voltage of the second node is periodically acquired by the sensing circuit with a predetermined time interval, and a sum of the voltage of the second node and a predetermined data voltage is used as the adjusted data voltage to be outputted to the first node by the data writing circuit. ### Claim 3 (depends on 2) The compensation method according to claim 2, wherein the sensing circuit comprises an analog-to-digital converter, and the predetermined time interval is n times of a sampling period of the analog-to-digital converter, wherein n is an integer. ### Claim 4 (depends on 1) The compensation method according to claim 1, wherein the measurement charging slope is calculated according to the following formula: a=(Vt-V0)/tc; wherein a is the measurement charging slope, Vt is the voltage of the second node at an end of the measurement charging cycle, V0 is the voltage of the second node at a beginning of the measurement charging cycle, and tc is the measurement charging cycle. ### Claim 5 (depends on 4) The compensation method according to claim 4, wherein the adjusted data voltage is calculated according to the following formula: Vdata=Vdata0+at; wherein Vdata is the adjusted data voltage, Vdata0 is the predetermined data voltage, and a is the measurement charging slope. ### Claim 6 (depends on 1) The compensation method according to claim 1, wherein the energy storage element is a capacitor, and the measurement charging cycle is proportional to a capacitance value of the capacitor. ### Claim 7 (depends on 1) The compensation method according to claim 1, wherein the pixel circuit further comprises a resetting circuit, the compensation method further comprises a resetting stage before the charging stage, wherein the voltage of the second node is reset by the resetting circuit in the resetting stage.