# US 8,786,535 B2 · Liquid Crystal display device and driving method thereof, television receiver, liquid crystal display program computer-readable storage medium storing the liquid crystal display program, and drive circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,535 B2 - Document ID: US8786535B2 - Status: Granted - Kind: B2 - Application number: 12/225,763 - Filed: 2006-12-19 - Published: 2009-05-07 - Granted: 2014-07-22 - Earliest claimed: 2006-04-19 - Assignees: Sharp Kabushiki Kaisha - Applicants: Makoto Shiomi; Toshihisa Uchida; Toshihide Tsubata; Junichi Sawahata; Naoshi Yamada - Inventors: Makoto Shiomi; Toshihisa Uchida; Toshihide Tsubata; Junichi Sawahata; Naoshi Yamada - Web page: https://patentgrep.com/patent/US8786535B2 ## CPC - G09G 3/3677: {suitable for active matrices only} - G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines} - G09G 3/3614: {Control of polarity reversal in general} - G09G 3/3688: {suitable for active matrices only} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 2320/0252: Improving the response speed - G09G 2320/043: Preventing or counteracting the effects of ageing - G09G 2330/023: using energy recovery or conservation - G09G 2340/16: Determination of a pixel data signal depending on the signal applied in the previous frame - 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 In one embodiment of the present invention, a driving method of a liquid crystal display device is disclosed. According to one embodiment of the present invention a driving method of an active matrix display device is disclosed including: a plurality of source lines; a plurality of gate lines that intersect the source lines; and a plurality of pixel formation sections being disposed in a matrix manner at the respective intersections of the source lines and the gate lines, each of the pixel formation sections receiving as a pixel value a voltage applied to the source line that passes through the corresponding intersection when the gate line that passes through the corresponding intersection is selected, wherein non-image signals are applied to the source lines in each horizontal scanning period, and the gate lines are selected in an effective scanning period, and thereafter the gate lines are selected, in sync with a timing of application of the non-image signals to the source lines, before the subsequent effective scanning period comes after a point in time when the gate lines have been brought into non-selected state. ## Claims ### Claim 1 A driving method of an active matrix type liquid crystal display device comprising: a plurality of data signal lines; a plurality of scanning signal lines that intersect the data signal lines; and a plurality of pixel sections being disposed in a matrix manner at the respective intersections of the data signal lines and the scanning signal lines, each of the pixel sections receiving as a pixel value a voltage applied to the data signal line that passes through the corresponding intersection when the scanning signal line that passes through the corresponding intersection is selected, wherein non-image signals are applied to the data signal lines at a boundary point between the adjacent horizontal scanning periods, the scanning signal lines are selected in an effective scanning period, and thereafter the scanning signal lines are selected, in sync with a timing of application of the non-image signals to the data signal lines, before the subsequent effective scanning period comes after a point in time when the scanning signal lines have been brought into non-selected state, application of the non-image signals to the data signal lines is performed with adjacent data signal lines short-circuited to each other, application of the non-image signals to the data signal lines is performed by use of a fixed voltage power source which applies a fixed voltage to each of the data signal lines, each of the non-image signals is a voltage that exists between voltages whose polarities are opposite to each other, application of the non-image signal to the data signal lines is performed at polarity reversal of a data signal, and at a time when a polarity of a signal on the data signal line is reversed in each horizontal scanning period, the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is an even-number. ### Claim 2 (depends on 1) The driving method according to claim 1, wherein the liquid crystal display device is a liquid crystal display device of vertical alignment mode in which a direction where liquid crystal molecules are aligned is controlled by an electric field, and the non-image signal is a pre-tilt signal by which the liquid crystal molecules are pre-tilted. ### Claim 3 (depends on 1) The driving method according to claim 1, wherein a polarity of a voltage corresponding to the non-image signal is identical with a polarity of a voltage corresponding to an image signal in a horizontal scanning period immediately after application of the non-image signal. ### Claim 4 (depends on 1) The driving method according to claim 1, wherein a polarity of a non-image signal selected at the end of one vertical scanning period and applied to the pixel section is identical with a polarity of an image signal selected in a subsequent vertical scanning period. ### Claim 5 (depends on 2) The driving method according to claim 2, wherein in a case where display luminance T when white luminance level is 1 and black luminance level is 0 is nearly close to T=(L/Lw)γ where L is display grayscale level, Lw is white display grayscale, and γ is γ characteristics, the pre-tilt signal is a signal indicating Lw×10(−3/γ) or greater. ### Claim 6 (depends on 2) The driving method according to claim 2, wherein regarding γ indicating γ characteristics, display grayscale L is defined as: L=255×T(1/2.2) where T is display luminance when white luminance level is 1 and black luminance level is 0, and the pre-tilt signal is a signal that generates a grayscale voltage higher than a grayscale voltage obtained when L=12. ### Claim 7 (depends on 5) The driving method according to claim 5, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 12th grayscale level or higher level out of 256 display grayscale levels. ### Claim 8 (depends on 5) The driving method according to claim 5, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 45th grayscale level or higher level out of 1024 grayscale levels for display. ### Claim 9 (depends on 2) The driving method according to claim 2, wherein when luminance level of white display is 100% and luminance level of black display is 0%, luminance level of the pre-tilt signal is not less than 0.1%. ### Claim 10 (depends on 1) The driving method according to claim 1, wherein application of the non-image signals to the data signal lines is performed by application of a voltage whose polarity is reversed in each vertical scanning period commonly to the data signal lines. ### Claim 11 (depends on 1) The driving method according to claim 1, wherein application of the non-image signals to the data signal lines is performed by application of a voltage whose polarity is reversed in each horizontal scanning period. ### Claim 12 (depends on 1) The driving method according to claim 1, wherein application of the non-image signals to the data signal lines is performed by application of voltages whose polarities are reversed in each horizontal scanning period, the voltages on the adjacent data signal lines being opposite in polarity to each other. ### Claim 13 (depends on 1) The driving method according to claim 1, wherein a polarity of a signal on the data signal line is reversed every plural horizontal scanning periods. ### Claim 14 (depends on 13) The driving method according to claim 13, wherein the non-image signal is applied to the data signal line when a polarity of a data signal is not reversed in between adjacent horizontal periods. ### Claim 15 (depends on 13) The driving method according to claim 13, wherein at a time when the polarity of the signal on the data signal line is reversed every n-number (n is an integer not less than 2) of horizontal scanning periods, the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is a multiple number of n. ### Claim 16 (depends on 15) The driving method according to claim 15, wherein the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is a multiple number of 2n. ### Claim 17 (depends on 13) The driving method according to claim 13, wherein application of the non-image signals to the data signal lines is performed by application of fixed voltages to each of the data signal lines, and polarities of the fixed voltages are reversed every plural horizontal scanning periods. ### Claim 18 (depends on 17) The driving method according to claim 17, wherein the fixed voltages are voltages whose polarities are reversed every plural horizontal scanning periods, and the fixed voltages applied on the adjacent data signal lines are opposite in polarity to each other. ### Claim 19 (depends on 1) The driving method according to claim 1, wherein the liquid crystal display device performs overshoot driving, and amounts of grayscale correction in the overshoot driving are found in accordance with polarities of pixels and video signals obtained from an external entity. ### Claim 20 (depends on 19) The driving method according to claim 19, wherein the amounts of grayscale correction for use in the overshoot driving are found by using a lookup table in which the polarities of the pixels and the video signals obtained from the external entity are associated with each other. ### Claim 21 (depends on 1) The driving method according to claim 1, wherein the liquid crystal display device performs overshoot driving, and after amounts of overshoot correction in the overshoot driving are found in relation to video signals obtained from an external entity, amounts of grayscale correction are found by using a lookup table in which polarities of pixels and the amounts of overshoot correction are associated with each other. ### Claim 22 (depends on 1) The driving method according to claim 1 wherein the liquid crystal display device has a backlight, and the backlight is turned off in sync with the timing of application of the non-image signal to the data signal line. ### Claim 23 (depends on 1) The driving method according to claim 1 wherein a duration of application of the non-image signal to the data signal line is shorter than a duration of application of an image signal for image display which signal is applied to the data signal lines. ### Claim 24 (depends on 1) The driving method according to claim 1 wherein the liquid crystal display device is a liquid crystal display device of normally black mode in which black display is performed in a state where no voltage is applied. ### Claim 25 An active matrix type liquid crystal display device comprising: a plurality of data signal lines; a plurality of scanning signal lines that intersect the data signal lines; a plurality of pixel sections being disposed in a matrix manner at the respective intersections of the data signal lines and the scanning signal lines, each of the pixel sections receiving as a pixel value a voltage applied to the data signal line that passes through the corresponding intersection when the scanning signal line that passes through the corresponding intersection is selected, wherein non-image signals are applied to the data signal lines at a boundary point between the adjacent horizontal scanning periods, the scanning signal lines are selected in an effective scanning period, and thereafter the scanning signal lines are selected, in sync with a timing of application of the non-image signals to the data signal lines, before the subsequent effective scanning period comes after a point in time when the scanning signal lines have been brought into non-selected state, adjacent data signal lines are connected and capable of being short-circuited to each other, and application of the non-image signals to the data signal lines is performed with the data signal lines short-circuited; and a fixed voltage power source that applies the non-image signals to the data signal lines by applying a common fixed voltage to the data signal lines, each of the non-image signals is a voltage that exists between voltages whose polarities are opposite to each other, application of the non-image signal to the data signal lines is performed at polarity reversal of a data signal, and at a time when a polarity of a signal on the data signal line is reversed in each horizontal scanning period, the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is an even-number. ### Claim 26 (depends on 25) The liquid crystal display device according to claim 25, wherein the liquid crystal display device is a liquid crystal display device of vertical alignment mode in which a direction where liquid crystal molecules are aligned is controlled by an electric field, and the non-image signal is a pre-tilt signal by which the liquid crystal molecules are pre-tilted. ### Claim 27 (depends on 25) The liquid crystal display device according to claim 25, wherein a polarity of a voltage corresponding to the non-image signal is identical with a polarity of a voltage corresponding to an image signal in a horizontal scanning period immediately after application of the non-image signal. ### Claim 28 (depends on 25) The liquid crystal display device according to claim 25, wherein a polarity of a non-image signal selected at the end of one vertical scanning period and applied to the pixel section is identical with a polarity of an image signal selected in a subsequent vertical scanning period. ### Claim 29 (depends on 26) The liquid crystal display device according to claim 26, wherein in a case where display luminance T when white luminance level is 1 and black luminance level is 0 is nearly close to T=(L/Lw)γ where L is display grayscale level, Lw is white display grayscale, and γ is γ characteristics, the pre-tilt signal is a signal indicating Lw×10(−3/γ) or greater. ### Claim 30 (depends on 26) The liquid crystal display device according to claim 26, wherein regarding γ indicating γ characteristics, display grayscale L is defined as: L=255×T(1/2.2) where T is display luminance when white luminance level is 1 and black luminance level is 0, and the pre-tilt signal is a signal that generates a grayscale voltage higher than a grayscale voltage obtained when L=12. ### Claim 31 (depends on 29) The liquid crystal display device according to claim 29, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 12th grayscale level or higher level out of 256 display grayscale levels. ### Claim 32 (depends on 29) The liquid crystal display device according to claim 29, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 45th grayscale level or higher level out of 1024 grayscale levels for display. ### Claim 33 (depends on 26) The liquid crystal display device according to claim 26, wherein when luminance level of white display is 100% and luminance level of black display is 0%, luminance level of the pre-tilt signal is not less than 0.1%. ### Claim 34 (depends on 25) The liquid crystal display device according to claim 25, further comprising: a first polarity reversal power source that applies the non-image signals to the data signal lines by applying a voltage whose polarity is reversed in each vertical scanning period commonly to the data signal lines. ### Claim 35 (depends on 25) The liquid crystal display device according to claim 25, further comprising: a second polarity reversal power source that applies the non-image signals to the data signal lines by applying a voltage whose polarity is reversed in each horizontal scanning period commonly to the data signal lines. ### Claim 36 (depends on 35) The liquid crystal display device according to claim 35, wherein the second polarity reversal power source applies the non-image signals commonly to the data signal lines by applying voltages whose polarities are reversed in each horizontal scanning period, the voltages on the adjacent data signal lines being opposite in polarity to each other. ### Claim 37 (depends on 25) The liquid crystal display device according to claim 25, wherein a polarity of a signal on the data signal line is reversed every plural horizontal scanning periods. ### Claim 38 (depends on 37) The liquid crystal display device according to claim 37, wherein the non-image signal is applied to the data signal line when a polarity of a data signal is not reversed in between adjacent horizontal periods. ### Claim 39 (depends on 37) The liquid crystal display device according to claim 37, wherein at a time when the polarity of the signal on the data signal line is reversed every n-number (n is an integer not less than 2) of horizontal scanning periods, the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is a multiple number of n. ### Claim 40 (depends on 39) The liquid crystal display device according to claim 39, wherein the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is a multiple number of 2n. ### Claim 41 (depends on 37) The liquid crystal display device according to claim 37, further comprising: a third polarity reversal power source that applies the non-image signals to the data signal lines by applying a voltage whose polarity is reversed every plural horizontal scanning periods to the data signal lines. ### Claim 42 (depends on 41) The liquid crystal display device according to claim 41, wherein the third polarity reversal power source applies the non-image signals to the data signal lines by applying to the data signal lines voltages whose polarities are reversed every plural horizontal scanning periods, the voltages on the adjacent data signal lines being opposite in polarity to each other. ### Claim 43 (depends on 25) The liquid crystal display device according to claim 25, wherein a duration of application of the non-image signal to the data signal line is shorter than a duration of application of an image signal for image display which signal is applied to the data signal lines. ### Claim 44 (depends on 25) The liquid crystal display device according to claim 25, wherein the liquid crystal display device is a liquid crystal display device of normally black mode in which black display is performed in a state where no voltage is applied. ### Claim 45 (depends on 25) The liquid crystal display device according to claim 25, further comprising: polarity information detecting means that detects pieces of polarity information of the pixels; and correction amount calculating means that finds the amounts of grayscale correction in overshoot driving in accordance with the polarity information and video signals obtained from an external entity. ### Claim 46 (depends on 45) The liquid crystal display device according to claim 45, further comprising: a lookup table in which the polarities of the pixels and the video signals obtained from the external entity are associated with each other. ### Claim 47 A non-transitory computer-readable storage medium storing a liquid crystal display program, the program, when executed, causing a computer to function as a polarity information detecting means, a correction amount calculating means, and to implement a driving method of an active matrix type liquid crystal display device comprising: a plurality of data signal lines; a plurality of scanning signal lines that intersect the data signal lines; and a plurality of pixel sections being disposed in a matrix manner at the respective intersections of the data signal lines and the scanning signal lines, each of the pixel sections receiving as a pixel value a voltage applied to the data signal line that passes through the corresponding intersection when the scanning signal line that passes through the corresponding intersection is selected, wherein non-image signals are applied to the data signal lines at a boundary point between the adjacent horizontal scanning periods, the scanning signal lines are selected in an effective scanning period, and thereafter the scanning signal lines are selected, in sync with a timing of application of the non-image signals to the data signal lines, before the subsequent effective scanning period comes after a point in time when the scanning signal lines have been brought into non-selected state, application of the non-image signals to the data signal lines is performed with adjacent data signal lines short-circuited to each other, application of the non-image signals to the data signal lines is performed by application of a fixed voltage to each of the data signal lines, the polarity information detecting means that detects pieces of polarity information of the pixels, the correction amount calculating means that finds the amounts of grayscale correction in overshoot driving in accordance with the polarity information and video signals obtained from an external entity, each of the non-image signals is a voltage that exists between voltages whose polarities are opposite to each other, application of the non-image signal to the data signal lines is performed at polarity reversal of a data signal, and at a time when a polarity of a signal on the data signal line is reversed in each horizontal scanning period, the number of times the scanning signal line is selected in sync with the timing of application of the non-image signal to the data signal line is an even-number. ### Claim 48 (depends on 25) A television receiver comprising: a liquid crystal display device according to claim 25; and a tuner section that receives a television broadcast. ### Claim 49 (depends on 6) The driving method according to claim 6, wherein the pre-tilt signal is a signal indicating y characteristics of 2.2 and 12th grayscale level or higher level out of 256 display grayscale levels. ### Claim 50 (depends on 6) The driving method according to claim 6, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 45th grayscale level or higher level out of 1024 grayscale levels for display. ### Claim 51 (depends on 30) The liquid crystal display device according to claim 30, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 12th grayscale level or higher level out of 256 display grayscale levels. ### Claim 52 (depends on 30) The liquid crystal display device according to claim 30, wherein the pre-tilt signal is a signal indicating γ characteristics of 2.2 and 45th grayscale level or higher level out of 1024 grayscale levels for display.