# US 10,504,454 B2 · Scan line drive circuit, display driver, electro-optical apparatus, electronic device, and driving method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,454 B2 - Document ID: US10504454B2 - Status: Granted - Kind: B2 - Application number: 15/712,556 - Filed: 2017-09-22 - Published: 2018-03-29 - Granted: 2019-12-10 - Earliest claimed: 2016-09-26 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Motoaki Nishimura; Akihiko Ito - Web page: https://patentgrep.com/patent/US10504454B2 ## CPC - G09G 3/3413: {Details of control of colour illumination sources} - G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)} - G09G 3/2092: {Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165)} - G09G 3/30: using electroluminescent panels - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3677: {suitable for active matrices only} - G09G 2310/0264: Details of driving circuits - G09G 2310/0267: Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays - G09G 2320/0219: Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling - G09G 2320/0223: Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal 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 The scan line drive circuit outputs selection signals GV3 and GV4 to select scan lines in the display panel. Assuming that a period in which a data voltage SV1 after being subjected to inversion of the polarity thereof is supplied to a data line in the display panel is a first period TSD, and that a period in which the data voltage SV1 after not being subjected to inversion of the polarity thereof is supplied to the data line is a second period TSC, the period TPD from the start of the first period TSD until the selection signal GV4 is activated is longer than the period TPC from the start of the second period TSC until the selection signal GV3 is activated. ## Claims ### Claim 1 A scan line drive circuit that outputs a selection signal to select a scan line in a display panel, wherein the scan line drive circuit is configured so that: a period in which a data voltage after being subjected to inversion of a polarity from a polarity in an immediately preceding pixel driving period is supplied to a data line in the display panel is a first period; a period in which a data voltage after not being subjected to inversion of a polarity from the polarity in the immediately preceding pixel driving period is supplied to the data line is a second period; a first wait period is a period from a start of the first period until the selection signal is activated to select a scan line to write the data voltage that has been subjected to the inversion of the polarity; a second wait period is a period from a start of the second period until the selection signal is activated to select a scan line to write the data voltage that has not been subjected to the inversion of the polarity, such that: every time a data voltage having an inverted polarity from the polarity in the immediately preceding pixel driving period is driven to a pixel, the first wait period precedes the activation of the selection signal; and every time a data voltage having a same polarity as the polarity in the immediately preceding pixel driving period is driven to a pixel, the second wait period precedes the activation of the selection signal; and the first wait period is longer than the second wait period, wherein: the display panel has a first pixel group to be selected by a first scan line and a second pixel group to be selected by a second scan line, the first scan line and the second scan line being provided corresponding to a first display line; and the data line is shared by a pixel in the first pixel group and a pixel in the second pixel group. ### Claim 2 (depends on 1) The scan line drive circuit according to claim 1, wherein: a length of a first selection period in which the selection signal is maintained in an active state within the first period is same as a length of a second selection period in which the selection signal is maintained in the active state within the second period. ### Claim 3 (depends on 1) The scan line drive circuit according to claim 1, wherein: the first period starts after the polarity of the data voltage has been inverted (i) due to switching from a first common voltage, which is higher than the data voltage, to a second common voltage, which is lower than the data voltage, or (ii) due to switching from the second common voltage to the first common voltage. ### Claim 4 (depends on 1) The scan line drive circuit according to claim 1, wherein: the selection signal to select the first scan line is activated to select the first pixel group (i) in a third period in which a data voltage having a same polarity as a polarity of a data voltage used to drive the first pixel group is supplied to the data line, and (ii) in a fourth period in which the data voltage used to drive the first pixel group is supplied to the data line; the selection signal to select the second scan line is activated to select the second pixel group (i) in a fifth period in which a data voltage having a same polarity as a polarity of a data voltage used to drive the second pixel group is supplied to the data line, and (ii) in a sixth period in which the data voltage used to drive the second pixel group is supplied to the data line; and if the fourth period or the sixth period is a period after a polarity of a respective data voltage has been inverted, a period from a start of the fourth period or the sixth period after the polarity of the respective data voltage has been inverted until the selection signal is activated is longer than a period from a start of a period, in which the respective data voltage after not being subjected to inversion of the polarity thereof is supplied to the data line, until the selection signal is activated. ### Claim 5 (depends on 4) The scan line drive circuit according to claim 4, wherein: if the third period or the fifth period is a period after the polarity of the respective data voltage has been inverted, a period from a start of the third period or the fifth period after the polarity of the respective data voltage has been inverted until the selection signal is activated is longer than a period from a start of a period, in which the respective data voltage after not being subjected to inversion of the polarity thereof is supplied to the data line, until the selection signal is activated. ### Claim 6 (depends on 1) A display driver comprising: the scan line drive circuit according to claim 1; and a data line drive circuit that drives the data line. ### Claim 7 (depends on 1) An electro-optical apparatus comprising: the scan line drive circuit according to claim 1; and the display panel. ### Claim 8 (depends on 1) An electronic device comprising the scan line drive circuit according to claim 1. ### Claim 9 A scan line drive circuit that outputs a selection signal to select a scan line in a display panel, wherein the scan line drive circuit is configured so that: a period in which a data voltage after being subjected to inversion of a polarity from a polarity in an immediately preceding pixel driving period is supplied to a data line in the display panel is a first period; a period in which a data voltage after not being subjected to inversion of a polarity from the polarity in the immediately preceding pixel driving period is supplied to the data line is a second period; a first wait period is a period from a start of the first period until the selection signal is activated to select a scan line to write the data voltage that has been subjected to the inversion of the polarity; a second wait period is a period from a start of the second period until the selection signal is activated to select a scan line to write the data voltage that has not been subjected to the inversion of the polarity, such that: every time a data voltage having an inverted polarity from the polarity in the immediately preceding pixel driving period is driven to a pixel, the first wait period precedes the activation of the selection signal; and every time a data voltage having a same polarity as the polarity in the immediately preceding pixel driving period is driven to a pixel, the second wait period precedes the activation of the selection signal; and the first wait period is longer than the second wait period, wherein: the display panel has a pixel on a first display line to be selected by a first scan line, a pixel on a second display line to be selected by a second scan line, and a pixel on a third display line to be selected by a third scan line; and the pixel on the first display line, the pixel on the second display line, and the pixel on the third display line are pixels having colors different from one another. ### Claim 10 (depends on 9) The scan line drive circuit according to claim 9, wherein: a length of a first selection period in which the selection signal is maintained in an active state within the first period is same as a length of a second selection period in which the selection signal is maintained in the active state within the second period. ### Claim 11 (depends on 9) The scan line drive circuit according to claim 9, wherein: the first period starts after the polarity of the data voltage has been inverted (i) due to switching from a first common voltage, which is higher than the data voltage, to a second common voltage, which is lower than the data voltage, or (ii) due to switching from the second common voltage to the first common voltage. ### Claim 12 (depends on 9) The scan line drive circuit according to claim 9, wherein: the selection signal to select the first scan line is activated (i) in a third period in which a data voltage having a same polarity as a polarity of a data voltage used to drive the first pixel group is supplied to the data line, and (ii) in a fourth period in which the data voltage used to drive the first pixel group is supplied to the data line; the selection signal to select the second scan line is activated (i) in a fifth period in which a data voltage having a same polarity as a polarity of a data voltage used to drive the second pixel group is supplied to the data line, and (ii) in a sixth period in which the data voltage used to drive the second pixel group is supplied to the data line; and if the fourth period or the sixth period is a period after a polarity of a respective data voltage has been inverted, a period from a start of the fourth period or the sixth period after the polarity of the respective data voltage has been inverted until the selection signal is activated is longer than a period from a start of a period, in which the respective data voltage after not being subjected to inversion of the polarity thereof is supplied to the data line, until the selection signal is activated. ### Claim 13 (depends on 12) The scan line drive circuit according to claim 12, wherein: if the third period or the fifth period is a period after the polarity of the respective data voltage has been inverted, a period from a start of the third period or the fifth period after the polarity of the respective data voltage has been inverted until the selection signal is activated is longer than a period from a start of a period, in which the respective data voltage after not being subjected to inversion of the polarity thereof is supplied to the data line, until the selection signal is activated. ### Claim 14 (depends on 9) A display driver comprising: the scan line drive circuit according to claim 9; and a data line drive circuit that drives the data line. ### Claim 15 (depends on 9) An electro-optical apparatus comprising: the scan line drive circuit according to claim 9; and the display panel. ### Claim 16 (depends on 9) An electronic device comprising the scan line drive circuit according to claim 9. ### Claim 17 A driving method for outputting a selection signal to select a scan line in a display panel, comprising: outputting the selection signal so that: a period in which a data voltage after being subjected to inversion of a polarity from a polarity in an immediately preceding pixel driving period is supplied to a data line in the display panel is a first period; a period in which a data voltage after not being subjected to inversion of a polarity from the polarity in the immediately preceding pixel driving period is supplied to the data line is a second period; a first wait period is a period from a start of the first period until the selection signal is activated to select a scan line to write the data voltage that has been subjected to the inversion of the polarity; a second wait period is a period from a start of the second period until the selection signal is activated to select a scan line to write the data voltage that has not been subjected to the inversion of the polarity, such that: every time a data voltage having an inverted polarity from the polarity in the immediately preceding pixel driving period is driven to a pixel, the first wait period precedes the activation of the selection signal; and every time a data voltage having a same polarity as the polarity in the immediately preceding pixel driving period is driven to a pixel, the second wait period precedes the activation of the selection signal; and the first wait period is longer than the second wait period, wherein: the display panel has a first pixel group to be selected by a first scan line and a second pixel group to be selected by a second scan line, the first scan line and the second scan line being provided corresponding to a first display line; and the data line is shared by a pixel in the first pixel group and a pixel in the second pixel group.