# US 11,443,696 B2 · Apparatus and method for driving display panel in power saving mode > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,696 B2 - Document ID: US11443696B2 - Status: Granted - Kind: B2 - Application number: 16/983,795 - Filed: 2020-08-03 - Published: 2022-02-03 - Granted: 2022-09-13 - Earliest claimed: 2020-08-03 - Assignees: Kunshan Yunyinggu Electronic Technology Co., Ltd. - Applicants: Kunshan Yunyinggu Electronics Technology Co., Ltd. - Inventors: Kun-Yueh Lin; Hong-Zhang Lin; Chun-Ta Wu; Yu-Hsun Peng - Web page: https://patentgrep.com/patent/US11443696B2 ## CPC - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)} - G09G 3/3275: Details of drivers for data electrodes - G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element - G09G 2310/0278: Details of driving circuits arranged to drive both scan and data electrodes - G09G 2320/0233: Improving the luminance or brightness uniformity across the screen - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - 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 An apparatus for display an active region having a plurality of light-emitting elements, a gate scanning driver operatively coupled to the active region and configured to stop a gate scanning signal to the plurality of light-emitting elements in a period, and a light emitting driver operatively coupled to the active region and configured to cause the plurality of light-emitting elements to emit light in the period. ## Claims ### Claim 1 An apparatus for display, comprising: an active region comprising a plurality of light-emitting elements; a gate scanning driver operatively coupled to the active region and configured to stop a gate scanning signal to the plurality of light-emitting elements for a period, the period comprising at least one frame; and a light emitting driver operatively coupled to the active region and configured to cause the plurality of light-emitting elements to emit light in the period, wherein the light emitting driver is configured provide a light emitting enable signal and a light emitting clock signal in the period and in another frame immediately prior to the period; the light emitting enable signal has a pulse signal in the at least one frame in the period, a width of the pulse signal is different from a width of another pulse signal in the other frame immediately prior to the period; and a scanning rate of the light emitting enable signal in the period is less than or equal to a scanning rate in the other frame. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the gate scanning signal comprises a gate scanning enable signal and a gate scanning clock signal; and a scanning rate of at least one of the gate scanning enable signal and the gate scanning clock signal is equal to zero in the period. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the scanning rate of each of the gate scanning enable signal and the gate scanning clock signal is equal to zero in the period. ### Claim 4 (depends on 1) The apparatus of claim 1, further comprising a source driving driver operatively coupled to the active region and configured to provide a data signal to the plurality of light-emitting elements immediately prior to the period and stop providing the data signal in the period. ### Claim 5 (depends on 4) The apparatus of claim 4, further comprising a capacitor operatively coupled to the plurality of light-emitting elements and configured to, during the period, retain the data signal provided immediately prior to the period. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the light emitting driver is configured to, in the period, provide the light emitting enable signal having a plurality of pulse signals in the at least one frame, a width of a respective pulse signal in a latter frame being different from a width of a respective pulse signal in a prior frame. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein widths of the pulse signals in the period gradually decrease. ### Claim 8 (depends on 6) The apparatus of claim 6, wherein widths of the pulse signals in the period gradually increase. ### Claim 9 (depends on 6) The apparatus of claim 6, wherein a number of the at least one frame is equal to or less than 4. ### Claim 10 (depends on 6) The apparatus of claim 6, wherein, in the period, the widths of pulse signals change exponentially with time in the at least one frame such that a luminance by the plurality of light-emitting elements in each of the at least one frame is nominally the same. ### Claim 11 (depends on 1) The apparatus of claim 1, wherein a ratio of the width of a pulse signal to a respective frame length in the other frame immediately prior to the period is different from a ratio of the width of a pulse signal to a respective frame length in the period. ### Claim 12 An apparatus for display, comprising: an active region comprising a plurality of light-emitting elements; and a light emitting driver operatively coupled to the active region and configured to provide a light emitting signal that causes the plurality of light-emitting elements to emit light in a first period and a second period, wherein the light emitting signal comprises a light emitting enable signal that scans the plurality of light-emitting elements at a first scanning rate in the first period and a second scanning rate in the second period, the first scanning rate being higher than or equal to the second scanning rate; and of the light emitting enable signal, a width of a pulse signal in a frame in the first period is different from a width of another pulse signal in a frame in the second period. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein a ratio of the width of the pulse signal to a respective frame length in is different from a ratio of the width of the other pulse signal to a respective frame length. ### Claim 14 (depends on 12) The apparatus of claim 12, wherein the second period comprises a plurality of frames, a frame length of each of the frames second period being greater than each frame length in the first period; and in the second period, the width of a pulse signal in a latter frame is less than the width of a pulse signal in a prior frame. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein in the second period, widths of pulse signals in the plurality of frames change exponentially such that a luminance corresponding to each of the plurality of frames is nominally e same. ### Claim 16 A method for driving a plurality of light-emitting elements on a display panel, comprising: scanning the plurality of light-emitting elements in a first period; causing the plurality of light-emitting elements to emit light based on a data signal in the first period; retaining the data signal; scanning the plurality of light-emitting elements in a second period; applying, in the second period, a light emitting enable signal to the plurality of light-emitting elements, wherein determining the light emitting enable signal comprises determining a width of a first pulse signal in a first frame in the second period to be different from a width of another pulse signal in a frame in the first period such that a luminance corresponding to the first frame in the second period and a luminance corresponding to the frame in the first period are nominally the same; and causing the plurality of light-emitting elements to emit light based on the data signal and the light emitting enable signal; in the second period. ### Claim 17 (depends on 16) The method of claim 16, further comprising: applying, in the first period, a gate scanning enable signal and a gate scanning clock signal to the plurality of light-emitting elements; each of the gate scanning enable signal and the gate scanning clock signal having a non-zero scanning rate; and applying, in the second period, no gate scanning enable signal and no gate scanning clock signal to the plurality of light-emitting elements. ### Claim 18 (depends on 16) The method of claim 16, wherein determining the light emitting enable signal further comprises: determining, in the second period, a width of a second pulse signal in a second frame after the first frame such that a luminance corresponding to the second frame and the luminance corresponding to the first frame are nominally the same.