# US 2021/0241712 A1 · Driving circuit and driving method for display panel and display module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0241712 A1 - Document ID: US20210241712A1 - Status: Published application - Kind: A1 - Application number: 17/017,704 - Filed: 2020-09-11 - Published: 2021-08-05 - Earliest claimed: 2019-09-11 - Assignees: Sitronix Technology Corp. - Applicants: Sitronix Technology Corp. - Inventors: Kai-Yi Wu; Yun-Chu Chen; Li-Yu Huang - Web page: https://patentgrep.com/patent/US20210241712A1 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors} - G09G 3/3666: {with the matrix divided into sections} - G09G 3/3674: {Details of drivers for scan electrodes} - G09G 3/3685: {Details of drivers for data electrodes} - G09G 2300/0426: Layout of electrodes and connections - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2320/0214: with crosstalk due to leakage current of pixel switch in active matrix panels - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - 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 driving circuit for a display panel includes a common voltage generating circuit. The common voltage generating circuit is coupled to multiple common electrodes of the display panel and configured to provide multiple common voltages respectively to the common electrodes. During a frame period, the common voltage generating circuit respectively changes a voltage level of the common voltages at different time. ## Claims ### Claim 1 A driving circuit for a display panel, comprising: a common voltage generating circuit, coupled to a plurality of common electrodes of the display panel and configured to provide a plurality of common voltages respectively to the common electrodes, wherein during a frame period, the common voltage generating circuit changes a voltage level of the common voltages respectively at different time. ### Claim 2 (depends on 1) The driving circuit for the display panel of claim 1, further comprising: a timing control circuit, coupled to the common voltage generating circuit and configured to control the common voltage generating circuit to change the voltage level of the common voltages. ### Claim 3 (depends on 1) The driving circuit for the display panel of claim 1, wherein after changing the voltage level of the common voltages, the common voltage generating circuit is further configured to maintain the voltage level of the common voltages for a predetermined period, and a length of the predetermined period is equal to a length of a frame period. ### Claim 4 (depends on 1) The driving circuit for the display panel of claim 1, wherein the display panel comprises a plurality of pixel structures, the pixel structures are grouped into a plurality of pixel groups, and the pixel groups are respectively coupled to the common electrodes. ### Claim 5 (depends on 1) The driving circuit for the display panel of claim 1, wherein the common voltages comprise a first common voltage and a second common voltage, the common electrodes comprise a first common electrode and a second common electrode, the first common voltage is provided to the first common electrode, the second common voltage is provided to the second common electrode, the common voltage generating circuit is configured to change the voltage level of the first common voltage at a first time within the frame period and is configured to change the voltage level of the second common voltage at a second time within the frame period, wherein the first time is different from the second time. ### Claim 6 (depends on 5) The driving circuit for the display panel of claim 5, wherein the time difference between the first time and the second time relates to an amount of the common voltages. ### Claim 7 (depends on 5) The driving circuit for the display panel of claim 5, wherein after changing the voltage level of the first common voltage and changing the voltage level of the second common voltage, the common voltage generating circuit is further configured to maintain the voltage level of the first common voltage for a first predetermined period and maintain the voltage level of the second common voltage for a second predetermined period, and a length of the first predetermined period and a length of the second predetermined period are equal to a length of a frame period. ### Claim 8 (depends on 5) The driving circuit for the display panel of claim 5, further comprising: a gate driving circuit, coupled to a plurality of gate lines of the display panel and configured to output a plurality of gate signals, wherein the gate signals comprise a plurality of first gate signals and a plurality of second gate signals; wherein the gate lines are grouped into a plurality of gate line groups, the gate line groups comprise a first gate line group and a second gate line group, the gate driving circuit is configured to sequentially output the first gate signals to the gate lines in the first gate line group according to a first order and sequentially output the second gate signals to the gate lines in the second gate line group according to a second order, and the first order is different from the second order. ### Claim 9 (depends on 5) The driving circuit for the display panel of claim 5, wherein the display panel comprises a plurality of pixel structures, the pixel structures are grouped into a plurality of pixel groups, the pixel groups comprise a first pixel group and a second pixel group, the pixel structures in the first pixel group are coupled to the first common electrode and the pixel structures in the second pixel group are coupled to the second common electrode. ### Claim 10 (depends on 1) The driving circuit for the display panel of claim 1, further comprising: a source driving circuit, coupled to a plurality of source lines of the display panel and configured to output a plurality of source signals. ### Claim 11 A driving method for driving a display panel, comprising: respectively providing a plurality of common voltages to a plurality of common electrodes of a display panel; and changing a voltage level of the common voltages at different time during a frame period. ### Claim 12 (depends on 11) The driving method for driving the display panel of claim 11, further comprising: maintaining the voltage level of the common voltages for a predetermined period after changing the voltage level of the common voltages, wherein a length of the predetermined period is equal to a length of a frame period. ### Claim 13 (depends on 11) The driving method for driving the display panel of claim 11, wherein the display panel comprises a plurality of pixel structures, the pixel structures are grouped into a plurality of pixel groups, and the pixel groups are respectively coupled to the common electrodes. ### Claim 14 (depends on 11) The driving method for driving the display panel of claim 11, wherein the common voltages comprise a first common voltage and a second common voltage, the common electrodes comprise a first common electrode and a second common electrode, the first common voltage is provided to the first common electrode, the second common voltage is provided to the second common electrode, and step of changing the voltage level of the common voltages at different time during the frame period further comprises: changing the voltage level of the first common voltage at a first time within the frame period; and changing the voltage level of the second common voltage at a second time within the frame period, wherein the first time is different from the second time. ### Claim 15 (depends on 14) The driving method for driving the display panel of claim 14, wherein the time difference between the first time and the second time relates to an amount of the common voltages. ### Claim 16 (depends on 14) The driving method for driving the display panel of claim 14, further comprising: maintaining the voltage level of the first common voltage for a first predetermined period after changing the voltage level of the first common voltage; and maintaining the voltage level of the second common voltage for a second predetermined period after changing the voltage level of the second common voltage, wherein a length of the first predetermined period and a length of the second predetermined period are equal to a length of a frame period. ### Claim 17 (depends on 14) The driving method for driving the display panel of claim 14, wherein the display panel comprises a plurality of gate lines, the gate lines are grouped into a plurality of gate line groups, the gate line groups comprise a first gate line group and a second gate line group, and the driving method for driving the display panel further comprises: sequentially outputting a plurality of first gate signals to the gate lines in the first gate line group according to a first order; and sequentially outputting a plurality of second gate signals to the gate lines in the second gate line group according to a second order, wherein the first order is different from the second order. ### Claim 18 (depends on 14) The driving method for driving the display panel of claim 14, wherein the display panel comprises a plurality of pixel structures, the pixel structures are grouped into a plurality of pixel groups, the pixel groups comprise a first pixel group and a second pixel group, the pixel structures in the first pixel group are coupled to the first common electrode and the pixel structures in the second pixel group are coupled to the second common electrode. ### Claim 19 (depends on 11) The driving method for driving the display panel of claim 11, further comprising: outputting a plurality of source signals to a plurality of source lines of the display panel. ### Claim 20 A display module, comprising: a display panel, comprising a plurality of common electrodes; and a common voltage generating circuit, coupled to the common electrodes and configured to provide a plurality of common voltages respectively to the common electrodes, wherein during a frame period, the common voltage generating circuit changes a voltage level of the common voltages respectively at different time. ### Claim 21 (depends on 20) The display module of claim 20, further comprising: a timing control circuit, coupled to the common voltage generating circuit and configured to control the common voltage generating circuit to change the voltage level of the common voltages. ### Claim 22 (depends on 20) The display module of claim 20, wherein after changing the voltage level of the common voltages, the common voltage generating circuit is further configured to maintain the voltage level of the common voltages for a predetermined period, and a length of the predetermined period is equal to a length of a frame period. ### Claim 23 (depends on 20) The display module of claim 20, wherein the display panel comprises a plurality of pixel structures, the pixel structures are grouped into a plurality of pixel groups, and the pixel groups are respectively coupled to the common electrodes. ### Claim 24 (depends on 20) The display module of claim 20, wherein the common voltages comprise a first common voltage and a second common voltage, the common electrodes comprise a first common electrode and a second common electrode, the first common voltage is provided to the first common electrode, the second common voltage is provided to the second common electrode, the common voltage generating circuit is configured to change the voltage level of the first common voltage at a first time within the frame period and is configured to change the voltage level of the second common voltage at a second time within the frame period, wherein the first time is different from the second time. ### Claim 25 (depends on 24) The display module of claim 24, wherein after changing the voltage level of the first common voltage and changing the voltage level of the second common voltage, the common voltage generating circuit is further configured to maintain the voltage level of the first common voltage for a first predetermined period and maintain the voltage level of the second common voltage for a second predetermined period, and a length of the first predetermined period and a length of the second predetermined period are equal to a length of a frame period. ### Claim 26 (depends on 24) The display module of claim 24, further comprising: a gate driving circuit, coupled to a plurality of gate lines of the display panel and configured to output a plurality of gate signals, wherein the gate signals comprise a plurality of first gate signals and a plurality of second gate signals; and a source driving circuit, coupled to a plurality of source lines of the display panel and configured to output a plurality of source signals, wherein the gate lines are grouped into a plurality of gate line groups, the gate line groups comprise a first gate line group and a second gate line group, the gate driving circuit is configured to sequentially output the first gate signals to the gate lines in the first gate line group according to a first order and sequentially output the second gate signals to the gate lines in the second gate line group according to a second order, and the first order is different from the second order.