# US 10,872,564 B2 · Data driver integrated circuit, display device comprising the same, and method of driving the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,564 B2 - Document ID: US10872564B2 - Status: Granted - Kind: B2 - Application number: 16/597,072 - Filed: 2019-10-09 - Published: 2020-04-16 - Granted: 2020-12-22 - Earliest claimed: 2018-10-10 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Jisu Choi; Myunggi Lim; Taeyoung Lee - Web page: https://patentgrep.com/patent/US10872564B2 ## CPC - G09G 3/325: the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver - G09G 3/3275: Details of drivers for data 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 2300/0828: forming a digital to analog [D/A] conversion circuit - G09G 2300/0876: Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2310/0294: Details of sampling or holding circuits arranged for use in a driver for data 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) ## Abstract A data driver IC can include an analog-to-digital converter; a sensing part that, in a sensing mode for sensing the driving characteristics of pixels, samples a signal outputted from the pixels in response to a data voltage for sensing, and, in a calibration mode for sensing the output characteristics of the analog-to-digital converter, samples a calibration current and outputs the same to the analog-to-digital converter; and a current generator that generates N calibration currents by dividing an external input source current into N parts, where N is a natural number. ## Claims ### Claim 1 A data driver integrated circuit (IC) comprising: an analog-to-digital converter; a sensing part that, in a sensing mode, samples a signal outputted from pixels in response to a data voltage for sensing, and, in a calibration mode, samples a calibration current and outputs the same to the analog-to-digital converter; and a current generator that generates N calibration currents by dividing an external input source current into N parts, where N is a natural number. ### Claim 2 (depends on 1) The data driver IC of claim 1, wherein the current generator comprises: N current distributors that store the source current as N calibration currents; N sampling switches that control the supply of the source current inputted to the N current distributors; and N sensing switches that control the calibration currents to output the same to the sensing part. ### Claim 3 (depends on 2) The data driver IC of claim 2, wherein, in the current generator, when all of the N sampling switches are turned on and all of the N sensing switches are turned off, the source current is stored in the N current distributors, and, when all of the N sampling switches are turned off and the N sensing switches are selectively turned on, the calibration currents are outputted to the sensing part. ### Claim 4 (depends on 2) The data driver IC of claim 2, wherein the current distributors comprise N transistors of a same channel size. ### Claim 5 (depends on 4) The data driver IC of claim 4, wherein the current distributors comprise a sampling capacitor that stores the gate-source voltages of the transistors. ### Claim 6 (depends on 4) The data driver IC of claim 4, wherein the transistors included in the current generator are N-type transistors. ### Claim 7 (depends on 1) The data driver IC of claim 1, wherein the sensing part comprises: an amplifier having a non-inverting input terminal connected to a reference voltage, an inverting input terminal for receiving the calibration currents, and an output terminal; a reset switch and a feedback capacitor connected in parallel between the inverting input terminal and the output terminal; and a sample and hold part that samples the output of the amplifier and outputs the same to the analog-to-digital converter. ### Claim 8 (depends on 1) The data driver IC of claim 1, further comprising a voltage supply part that supplies a video data voltage to the pixels in a display mode and supplies a data voltage for sensing to the pixels in the sensing mode. ### Claim 9 (depends on 1) A display device comprising: a display panel with a plurality of pixels; and the data driver IC of claim 1 connected to the display panel. ### Claim 10 (depends on 9) The display device of claim 9, further comprising a timing controller that corrects input video data to be written to the pixels, based on first characteristic data produced by sampling a signal outputted from the pixels in a sensing mode and second characteristic data produced by sampling a calibration current in a calibration mode. ### Claim 11 (depends on 10) The display device of claim 10, wherein the timing controller corrects the input video data by receiving an N number of second characteristic data corresponding to N calibration currents and taking the average of the N number of second characteristic data. ### Claim 12 A display device comprising: a display panel with a plurality of pixels connected to sensing lines; a current source that supplies an electrical current; a data driver integrated circuit (IC) having a sensing part that, in a sensing mode, samples a signal outputted from the pixels in response to a data voltage for sensing to output first characteristic data to an analog-to-digital converter, and, in a calibration mode, samples a calibration current to output second characteristic data to the analog-to-digital converter; and a timing controller that corrects input video data to be written to the pixels based on the first characteristic data and the second characteristic data, wherein the data driver IC generates N calibration currents by dividing the current supplied from the current source into N parts, where N is a natural number. ### Claim 13 (depends on 12) The display device of claim 12, wherein the data driver IC comprises a current generator comprising: N current distributors that store the current supplied from the current source as N calibration currents, N sampling switches that control the supply of the source current inputted to the N current distributors, and N sensing switches that control the calibration currents to output the same to the sensing part, and wherein the timing controller corrects the input video data by receiving an N number of second characteristic data corresponding to N calibration currents and taking the average of the N number of second characteristic data. ### Claim 14 A method of driving a display device, the method comprising: generating N calibration currents by a current generator inside a data driver integrated circuit (IC) by dividing an external input source current into N parts, where N is a natural number; sampling the N calibration currents to produce an N number of digital data by a sensing part inside the data driver IC; receiving the N number of digital data and taking the average thereof by a timing controller; storing the calculated average value as second characteristic data representing the output characteristics of the analog-to-digital converter of the sensing part; and correcting video data based on the second characteristic data by the timing controller. ### Claim 15 (depends on 14) The method of claim 14, further comprising: sampling a signal outputted from pixels in response to a data voltage for sensing to produce digital data by the sensing part inside the data driver IC; and storing the digital data produced by sampling a signal outputted from the pixels as first characteristic data representing the driving characteristics of the pixels, wherein the correcting of video data comprises correcting input video data to be written to the pixels based on the first characteristic data and the second characteristic data.