# US 10,504,472 B2 · Source drive 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 10,504,472 B2 - Document ID: US10504472B2 - Status: Granted - Kind: B2 - Application number: 15/576,373 - Filed: 2017-05-10 - Published: 2018-12-27 - Granted: 2019-12-10 - Earliest claimed: 2016-11-24 - Assignees: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd. - Applicants: BOE Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd. - Inventors: Ke Dai; Wenwu Lu; Chunyang Nie; Xiaoliang Cheng - Web page: https://patentgrep.com/patent/US10504472B2 ## CPC - G09G 3/3688: {suitable for active matrices only} - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0219: Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling - G09G 2320/0693: Calibration of display systems - 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 source drive circuit and a display device. The source drive circuit includes: a detection circuit, configure to detect a change value of a common voltage; and a compensation circuit, configured to obtain a compensation data signal based on a data signal and the change value of the common voltage, and output the compensation data signal to a pixel electrode of a display panel. ## Claims ### Claim 1 A source drive circuit, comprising: a detection circuit, configured to detect a change value of a common voltage based on a common voltage feedback signal input by a display panel; and a compensation circuit, configuration to obtain a compensation data signal based on a data signal and the change value of the common voltage, and output the compensation data signal to a pixel electrode of the display panel, wherein the detection circuit comprises a differential amplifier, configured to calculate a difference between a common voltage reference signal and the common voltage feedback signal to obtain the change value of the common voltage, the compensation circuit comprises an inverting operational amplifier and a non-inverting adder, the inverting operational amplifier is configured to invert and amplify the change value of the common voltage to obtain an amplified common voltage change value, and the non-inverting adder is configured to obtain and output the compensation data signal based on the data signal and the amplified common voltage change value, a non-inverting input terminal of the differential amplifier is connected with a common voltage line through a first resistor, an inverting input terminal of the differential amplifier is connected with a feedback common voltage line through a second resistor, the non-inverting input terminal of the differential amplifier is connected with a first voltage terminal through a third resistor, and the inverting input terminal and an output terminal of the differential amplifier are connected through a fourth resistor; the output terminal of the differential amplifier is connected with an inverting input terminal of the inverting operational amplifier through a fifth resistor, the inverting input terminal of the inverting operational amplifier is connected with an output terminal of the inverting operational amplifier through a sixth resistor; and a non-inverting input terminal of the inverting operational amplifier is connected with a second voltage terminal through a seventh resistor; and a non-inverting input terminal of the non-inverting adder is connected with a data signal voltage line through an eighth resistor, the output terminal of the inverting operational amplifier is connected with the non-inverting input terminal of the non-inverting adder through a ninth resistor, an inverting input terminal of the non-inverting adder is connected with an output terminal of the non-inverting adder through a tenth resistor, and the inverting input terminal of the non-inverting adder is connected with a third voltage terminal through an eleventh resistor. ### Claim 2 (depends on 1) The source drive circuit according to claim 1, wherein the first voltage terminal, the second voltage terminal, and the third voltage terminal are ground voltage terminals. ### Claim 3 (depends on 1) The source drive circuit according to claim 1, wherein resistance of the sixth resistor is adjustable. ### Claim 4 (depends on 1) The source drive circuit according to claim 1, wherein the common voltage reference signal is generated by a timing control circuit. ### Claim 5 (depends on 1) The source drive circuit according to claim 1, wherein the common voltage feedback signal is a common voltage signal of a detection point disposed on the display panel. ### Claim 6 (depends on 1) The source drive circuit according to claim 1, wherein the data signal is an initial data signal without common voltage compensation. ### Claim 7 (depends on 1) A display device, comprising: the source drive circuit according to claim 1; and a display panel connected with the source drive circuit. ### Claim 8 (depends on 7) The display device according to claim 7, wherein the display panel provides the common voltage feedback signal for the source drive circuit, and the source drive circuit provides the compensation data signal to the display panel at least based on the common voltage feedback signal. ### Claim 9 (depends on 7) The display device according to claim 7, wherein the display panel is provided with a detection point for obtaining the common voltage feedback signal. ### Claim 10 A source drive circuit, comprising: a detection circuit, configured to detect a change value of a common voltage; and a compensation circuit, configured to obtain a compensation data signal based on a data signal and the change value of the common voltage, and output the compensation data signal to a pixel electrode of a display panel, wherein the detection circuit comprises a differential amplifier, configured to calculate a difference between a common voltage reference signal and a common voltage feedback signal to obtain the change value of the common voltage, the compensation circuit comprises an inverting operational amplifier and a non-inverting adder, wherein the inverting operational amplifier is configured to invert and amplify the change value of the common voltage to obtain an amplified common voltage change value, and the non-inverting adder is configured to obtain and output the compensation data signal based on the data signal and the amplified common voltage change value, a non-inverting input terminal of the differential amplifier is connected with a common voltage line through a first resistor, an inverting input terminal of the differential amplifier is connected with a feedback common voltage line through a second resistor, the non-inverting input terminal of the differential amplifier is connected with a first voltage terminal through a third resistor, and the inverting input terminal and an output terminal of the differential amplifier are connected through a fourth resistor, the output terminal of the differential amplifier is connected with an inverting input terminal of the inverting operational amplifier through a fifth resistor, the inverting input terminal of the inverting operational amplifier is connected with an output terminal of the inverting operational amplifier through a sixth resistor; and a non-inverting input terminal of the inverting operational amplifier is connected with a second voltage terminal through a seventh resistor, and a non-inverting input terminal of the non-inverting adder is connected with a data signal voltage line through an eighth resistor, the output terminal of the inverting operational amplifier is connected with the non-inverting input terminal of the non-inverting adder through a ninth resistor, an inverting input terminal of the non-inverting adder is connected with an output terminal of the non-inverting adder through a tenth resistor, and the inverting input terminal of the non-inverting adder is connected with a third voltage terminal through an eleventh resistor.