# US 2022/0044628 A1 · Driving method of display device 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 2022/0044628 A1 - Document ID: US20220044628A1 - Status: Published application - Kind: A1 - Application number: 17/381,235 - Filed: 2021-07-21 - Published: 2022-02-10 - Earliest claimed: 2020-08-06 - Assignees: EverDisplay Optronics (Shanghai) Limited - Applicants: Everdisplay Optronics (Shanghai) Co.,Ltd. - Inventors: Xiangshu LI; JehYen KANG; Fei SHEN; Keitaro YAMASHITA - Web page: https://patentgrep.com/patent/US20220044628A1 ## CPC - G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED] - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor - G09G 2300/0866: by means of changes in the pixel supply voltage - G09G 2310/061: for resetting or blanking - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame - 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 driving method of a display device and a display device. The driving method includes: generating and outputting a frame image signal to an organic light emitting device, wherein the frame image signal includes an active data region and a blank region based on a time sequence; in the active data region of the frame image signal, using a timing controller to write a data voltage into the gate of the thin film transistor, store it in a storage capacitor, and apply it to the organic light emitting device through the thin film transistor; and in response to reaching the blank region of the frame image signal as determined by the timing controller, changing the first voltage at the cathode of the organic light emitting device to compensate the operating current of the organic light emitting device. ## Claims ### Claim 1 A driving method of a display device, comprising: generating and outputting a frame image signal to an organic light emitting device, wherein the frame image signal comprises an active data region and a blank region based on a time sequence; in the active data region of the frame image signal, using a timing controller to write a data voltage into a gate of a thin film transistor, store the data voltage in a storage capacitor, and apply the data voltage to the organic light emitting device through the thin film transistor; and in response to reaching the blank region of the frame image signal as determined by the timing controller, changing a first voltage at a cathode of the organic light emitting device to compensate an operating current of the organic light emitting device, thereby maintaining a brightness of a current frame image signal of the organic light emitting device to be the same as a brightness of a previous frame image signal. ### Claim 2 (depends on 1) The driving method of the display device according to claim 1, wherein time duration for changing the first voltage of the organic light emitting device decreases as frequency of the frame image signal increases. ### Claim 3 (depends on 1) The driving method of the display device according to claim 1, wherein the operating current of the organic light emitting device decreases as the first voltage of the organic light emitting device increases. ### Claim 4 (depends on 1) The driving method of the display device according to claim 1, wherein after leaving the blank region of the frame image signal as determined by the timing controller, the first voltage at the cathode of the organic light emitting device is restored. ### Claim 5 (depends on 1) The driving method of the display device according to claim 1, wherein the first voltage is a cathode driving voltage. ### Claim 6 A display device, comprising: an organic light emitting device, wherein a cathode of the organic light emitting device is connected to a first voltage; a first transistor, wherein a drain of the first transistor is connected to an anode of the organic light emitting device; and a second transistor, wherein a source of the second transistor is connected to a second voltage, a drain of the second transistor is connected to a source of the first transistor, and a capacitor is connected between the gate and the source of the second transistor, wherein a frame image signal is generated and outputted by a timing controller to the gate of the second transistor, the frame image signal is stored in the capacitor, the frame image signal comprises an active data region and a blank region based on a time sequence, and after the first transistor is turned on, the frame image signal is input to the organic light emitting device; and in response to reaching the blank region of the frame image signal as determined by the timing controller, a first voltage at the cathode of the organic light emitting device is changed to compensate an operating current of the display device, thereby maintaining a brightness of a current frame image signal of the display device to be the same as a brightness of a previous frame image signal. ### Claim 7 (depends on 6) The display device according to claim 6, wherein time duration for changing the first voltage of the organic light emitting device decreases as frequency of the frame image signal increases. ### Claim 8 (depends on 6) The display device according to claim 6, wherein the operating current of the organic light emitting device decreases as the first voltage of the organic light emitting device increases. ### Claim 9 (depends on 6) The display device according to claim 6, wherein after leaving the blank region of the frame image signal as determined by the timing controller, the first voltage at the cathode of the organic light emitting device is restored. ### Claim 10 (depends on 6) The display device according to claim 6, wherein the first voltage is a cathode driving voltage and the second voltage is an anode driving voltage.