# US 2019/0318704 A1 · Display device and drive method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0318704 A1 - Document ID: US20190318704A1 - Status: Published application - Kind: A1 - Application number: 16/473,273 - Filed: 2018-01-24 - Published: 2019-10-17 - Earliest claimed: 2017-01-31 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Kazuo NAKAMURA; Masaaki NISHIO - Web page: https://patentgrep.com/patent/US20190318704A1 ## CPC - G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} - G09G 3/3688: {suitable for active matrices only} - G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)} - G09G 3/3266: Details of drivers for scan electrodes - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3677: {suitable for active matrices only} - G09G 3/3685: {Details of drivers for data electrodes} - G09G 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters - G09G 2310/0275: Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current - G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit - G09G 2380/10: Automotive applications - 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) - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract There is provided a display device that can suppress occurrence of abnormal display caused by “differences in the settling time of data voltages” between the positions of source bus lines. An output circuit in a source driver is configured to selectively output data voltages and predetermined voltages (e.g., positive-polarity and negative-polarity gradation voltages corresponding to a gradation value at an intermediate level) other than the data voltages. A display control circuit is provided with a register that holds information identifying source bus lines whose charging rates are to be adjusted; and a charge sharing control unit that outputs charge sharing control signals based on the information held in the register. Based on the charge sharing control signals, the output circuit applies the predetermined voltages, for a certain period, to source bus lines whose charging rates are to be adjusted and then applies data voltages to the source bus lines. ## Claims ### Claim 1 A display device that has a display unit in which a plurality of video signal lines are arranged, and displays an image created based on input image data on the display unit, the display device comprising: a video signal line drive circuit including an output circuit configured to apply data voltages generated based on the input image data to the plurality of video signal lines; and an output control unit configured to control operation of the output circuit such that application start timing of desired data voltages to control-target video signal lines is delayed relative to application start timing of desired data voltages to video signal lines other than the control-target video signal lines, the control-target video signal lines being specified video signal lines among the plurality of video signal lines. ### Claim 2 (depends on 1) The display device according to claim 1, wherein a data voltage application period includes an adjustment period and an all-line charging period, the data voltage application period being a period during which application of the data voltages to video signal lines is performed, and the all-line charging period being a period following the adjustment period, the output circuit is configured to selectively output the data voltages and a predetermined voltage other than the data voltages, and the output control unit controls the operation of the output circuit such that during the adjustment period the desired data voltages are applied to the video signal lines other than the control-target video signal lines and the predetermined voltage is applied to the control-target video signal lines, and during the all-line charging period the desired data voltages are applied to all of the plurality of video signal lines. ### Claim 3 (depends on 2) The display device according to claim 2, wherein the control-target video signal lines are divided into N (N is an integer greater than or equal to 2) groups, as the adjustment period, N adjustment periods having same start timing and different end timings are prepared for the N groups, respectively, and the output control unit controls the operation of the output circuit such that the predetermined voltage is applied to control-target video signal lines included in any group during an adjustment period corresponding to relevant group. ### Claim 4 (depends on 2) The display device according to claim 2, wherein the video signal line drive circuit further includes a gradation voltage generator circuit configured to generate a gradation voltage group including a plurality of gradation voltages from which the data voltages are originated, and one or more gradation voltages included in the gradation voltage group are provided as the predetermined voltage to the output circuit from the gradation voltage generator circuit. ### Claim 5 (depends on 1) The display device according to claim 1, wherein a data voltage application period includes an adjustment period and an all-line charging period, the data voltage application period being a period during which application of the data voltages to video signal lines is performed, and the all-line charging period being a period following the adjustment period, and the output control unit controls the operation of the output circuit such that during the adjustment period the desired data voltages are applied to the video signal lines other than the control-target video signal lines and voltages applied to the control-target video signal lines immediately before starting the adjustment period are applied as they are to the control-target video signal lines, and during the all-line charging period the desired data voltages are applied to all of the plurality of video signal lines. ### Claim 6 (depends on 5) The display device according to claim 5, wherein the control-target video signal lines are divided into N (N is an integer greater than or equal to 2) groups, as the adjustment period, N adjustment periods having same start timing and different end timings are prepared for the N groups, respectively, and the output control unit controls the operation of the output circuit such that to control-target video signal lines included in any group, during an adjustment period corresponding to relevant group, the voltages applied to the control-target video signal lines immediately before starting the adjustment period are applied as they are. ### Claim 7 (depends on 1) The display device according to claim 1, wherein a data voltage application period includes a first adjustment period, a second adjustment period, and an all-line charging period, the data voltage application period being a period during which application of the data voltages to video signal lines is performed, the second adjustment period being a period following the first adjustment period, and the all-line charging period being a period following the second adjustment period, the output circuit is configured to selectively output the data voltages and a predetermined voltage other than the data voltages, and the output control unit controls the operation of the output circuit such that during the first adjustment period the desired data voltages are applied to the video signal lines other than the control-target video signal lines and voltages applied to the control-target video signal lines immediately before starting the first adjustment period are applied as they are to the control-target video signal lines, during the second adjustment period the desired data voltages are applied to the video signal lines other than the control-target video signal lines and the predetermined voltage is applied to the control-target video signal lines, and during the all-line charging period the desired data voltages are applied to all of the plurality of video signal lines. ### Claim 8 (depends on 1) The display device according to claim 1, further comprising a register configured to hold information identifying the control-target video signal lines, wherein the output control unit controls the operation of the output circuit based on the information held in the register. ### Claim 9 (depends on 1) The display device according to claim 1, wherein the display unit has a non-rectangular shape, and video signal lines with a comparatively short length among the plurality of video signal lines are specified as the control-target video signal lines. ### Claim 10 (depends on 1) The display device according to claim 1, wherein the display unit is logically divided into a plurality of areas, and the output control unit controls the operation of the output circuit such that an amount of delay in application start timing of the desired data voltages is larger for an area with smaller load on video signal lines. ### Claim 11 A drive method for a display device that has a display unit in which a plurality of video signal lines are arranged, and displays an image created based on input image data on the display unit, the drive method comprising: an outputting step of applying, by an output circuit, data voltages generated based on the input image data to the plurality of video signal lines; and an output controlling step of controlling operation of the output circuit such that application start timing of desired data voltages to control-target video signal lines is delayed relative to application start timing of desired data voltages to video signal lines other than the control-target video signal lines, the control-target video signal lines being specified video signal lines among the plurality of video signal lines.