# US 11,908,421 B2 · Display apparatus having an initial period with multiple refreshes and method for operating the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,908,421 B2 - Document ID: US11908421B2 - Status: Granted - Kind: B2 - Application number: 17/970,441 - Filed: 2022-10-20 - Published: 2023-06-22 - Granted: 2024-02-20 - Earliest claimed: 2021-12-20 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Sanghun Yoon; Kyeongtaek Min - Web page: https://patentgrep.com/patent/US11908421B2 ## CPC - G09G 3/3225: using an active matrix - G09G 3/3275: Details of drivers for data electrodes - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 3/3266: Details of drivers for scan electrodes - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2330/021: Power management, e.g. power saving - G09G 2340/0435: Change or adaptation of the frame rate of the video stream - 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 Disclosed are a display apparatus capable of changing a refresh period to improve response characteristics under a low-speed operation mode, and a method for operating the apparatus. The display apparatus includes a display panel; and a panel driving circuit configured to drive the display panel, wherein in a low-speed operation mode, the apparatus is configured to control the panel driving circuit to: perform multiple refreshes during an initial period of the first frame; and, after the multiple refreshes, change a refresh period and perform refreshes based on the changed refresh period. ## Claims ### Claim 1 A display apparatus, comprising: a display panel; and a panel driving circuit configured to drive the display panel, wherein in a low-speed operation mode, the apparatus is configured to control the panel driving circuit to: perform multiple refreshes during an initial period of a first frame; and change a refresh period and perform refreshes based on the changed refresh period after the multiple refreshes, and wherein the apparatus is configured to: perform refresh at an interval of a first period after performing the multiple refreshes at the first frame; perform refresh at an interval of a second period greater than the first period at a second frame; and perform refresh at an interval of a third period greater than the second period at a third frame. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the apparatus is configured to change the refresh period for each frame after performing the multiple refreshes. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the apparatus is configured to change the refresh period for each frame during a predetermined number of frames. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the apparatus is configured to increase the refresh period as frames progress after performing the multiple refreshes. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the apparatus is configured to: continuously perform multiple refreshes with a predetermined number of times at a first frequency at an initial period of the first frame; perform refresh at an interval of a first period during a remaining period of the first frame; and perform refresh at an interval of a second period larger than the first period at a second frame. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein in the low-speed operation mode of the display panel, an operating frequency of the apparatus gradually decreases. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the apparatus is configured to: continuously perform multiple refreshes with a predetermined number of times at a first frequency at an initial period of the first frame; perform refresh n times at an interval of a first period at a remaining period of the first frame; and perform refresh m times an interval of a second period at a second frame. ### Claim 8 A display apparatus, comprising: a display panel; a source driver configured to drive a data line of the display panel; a gate driver configured to drive a gate line of the display panel; and a timing controller configured to control the source driver and the gate driver in a low-speed operation mode, perform multiple refreshes at an initial period of a first frame, and change a refresh period and perform refresh after performing the multiple refreshes, wherein the timing controller is configured to increase the refresh period as frames progress, after performing the multiple refreshes. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the timing controller is configured to change the refresh period for each frame after performing the multiple refreshes. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the timing controller is configured to change the refresh period for each frame during a predetermined number of frames. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the timing controller is configured to: perform refresh at an interval of a first period after performing the multiple refreshes at the first frame; and perform refresh at an interval of a second period greater than the first period at a second frame. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the timing controller is configured to perform refresh at an interval of a third period greater than the second period at a third frame. ### Claim 13 (depends on 8) The apparatus of claim 8, wherein the timing controller is configured to: continuously perform multiple refreshes with a predetermined number of times at a first frequency at an initial period of the first frame; perform refresh at an interval of a first period at a remaining period of the first frame; and perform refresh at an interval of a second period larger than the first period at a second frame. ### Claim 14 A method for operating a display apparatus, the method comprising: performing multiple refreshes at an initial period of a first frame in a low-speed operation mode; performing refresh at an interval of a first period at a remaining period of the first frame; performing refresh at an interval of a second period greater than the first period during a second frame; and performing refresh at an interval of a third period greater than the second period at a third frame. ### Claim 15 (depends on 14) The method of claim 14, wherein the performing the multiple refreshes includes continuously performing refresh with a predetermined number of times at a first frequency at the initial period of the first frame. ### Claim 16 (depends on 14) The method of claim 14, wherein the performing refresh includes that an operating frequency of the apparatus gradually decreases in the low-speed operation mode.