# US 10,311,804 B2 · Liquid crystal display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,311,804 B2 - Document ID: US10311804B2 - Status: Granted - Kind: B2 - Application number: 15/574,120 - Filed: 2016-05-19 - Published: 2018-12-06 - Granted: 2019-06-04 - Earliest claimed: 2015-05-22 - Assignees: Sharp Kabushiki Kaisha - Applicants: Sharp Kabushiki Kaisha - Inventors: Iori Aoyama; Takahiro Sasaki; Yuichi Kita; Kazutaka Hanaoka - Web page: https://patentgrep.com/patent/US10311804B2 ## CPC - G09G 3/3413: {Details of control of colour illumination sources} - G02F 1/133: Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements (arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G3/36) - G02F 1/133621: {providing coloured light (G02F1/133617, G02F1/133533 take precedence)} - G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)} - G02F 1/134309: {characterised by their geometrical arrangement} - G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]} - G02F 1/136286: {Wiring, e.g. gate line, drain line} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G02F 1/137: characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering - G09G 3/36: using liquid crystals - G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)} - G09G 3/3611: {Control of matrices with row and column drivers} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02F 1/133622: {Colour sequential illumination} - G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned} - G02F 1/134381: {Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates} - G02F 1/13706: {the liquid crystal having positive dielectric anisotropy} - G02F 2201/122: having a particular pattern - G02F 2201/123: pixel - G09G 2310/0235: Field-sequential colour display - G09G 2320/0252: Improving the response speed - G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping - 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 - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract In particular case second vertical scanning period includes a write period in which a first potential difference V1 is to be given to an upper electrode and a lower electrode. In another particular case, the second vertical scanning period includes a write period in which a second potential difference V2 being greater than the first potential difference V1 is given to the upper electrode and the lower electrode. In the former write period, substantially the same potential as that of a counter electrode is given to the upper electrode, and a different potential from that of the counter electrode is given to the lower electrode. In the latter write period, substantially the same potential as that of the counter electrode is given to the lower electrode, and a different potential from that of the counter electrode is given to the upper electrode. ## Claims ### Claim 1 A liquid crystal display device comprising a liquid crystal display panel and having a pixel, the liquid crystal display panel including a first substrate and a second substrate opposed to each other and a liquid crystal layer interposed between the first substrate and the second substrate, wherein, the first substrate includes an upper electrode provided for the pixel, and a lower electrode disposed under the upper electrode via an insulating layer, the lower electrode generating a lateral field across the liquid crystal layer with the upper electrode; the second substrate includes a counter electrode opposed to the upper electrode and the lower electrode, the counter electrode generating a vertical field across the liquid crystal layer with the upper electrode and the lower electrode; the pixel is capable of switchably presenting a black displaying state of performing black displaying with a vertical field generated across the liquid crystal layer, a white displaying state of performing white displaying with a lateral field generated across the liquid crystal layer, or a transparent displaying state in which a rear face side of the liquid crystal display panel is visible in a see-through manner with no voltage being applied to the liquid crystal layer; the upper electrode includes a plurality of branch portions extending along a predetermined direction, and at least one slit interposed between two mutually adjacent branch portions among the plurality of branch portions; each of the plurality of branch portions has a width L which is equal to or greater than a width S of each of the at least one slit; one vertical scanning period includes at least one write period in which a displaying voltage is written to the pixel; a vertical scanning period is designated a first vertical scanning period, and a vertical scanning period that immediately follows the first vertical scanning period is designated a second vertical scanning period, and (A) when the first vertical scanning period and the second vertical scanning period are to display a same gray scale level and the pixel is to perform white displaying in the second vertical scanning period, the second vertical scanning period includes a write period in which a first potential difference V1 which is 60% or less of a potential difference V0 between the lower electrode and the counter electrode in the black displaying state is to be given to the upper electrode and the lower electrode, (B) when the first vertical scanning period and the second vertical scanning period are to display different gray scale levels and the pixel is to perform white displaying in the second vertical scanning period, the second vertical scanning period includes a write period in which a second potential difference V2 being greater than the first potential difference V1 is to be given to the upper electrode and the lower electrode; in a write period in which the first potential difference V1 is to be given to the upper electrode and the lower electrode, substantially a same potential as that of the counter electrode is given to the upper electrode, and a different potential from that of the counter electrode is given to the lower electrode; and in a write period in which the second potential difference V2 is to be given to the upper electrode and the lower electrode, substantially a same potential as that of the counter electrode is given to the lower electrode, and a different potential from that of the counter electrode is given to the upper electrode. ### Claim 2 (depends on 1) The liquid crystal display device of claim 1, wherein, one vertical scanning period includes two said write periods; and in case (B), in each of a first-occurring write period and a second-occurring write period in the second vertical scanning period, the second potential difference V2 is given to the upper electrode and the lower electrode. ### Claim 3 (depends on 1) The liquid crystal display device of claim 1, wherein, one vertical scanning period includes two said write periods; and in case (A), in each of a first-occurring write period and a second-occurring write period in the second vertical scanning period, the first potential difference V1 is given to the upper electrode and the lower electrode. ### Claim 4 (depends on 1) The liquid crystal display device of claim 1, wherein, one vertical scanning period includes two said write periods; and in case (A), the second potential difference V2 is given to the upper electrode and the lower electrode in a first-occurring write period in the second vertical scanning period, and the first potential difference V1 is given to the upper electrode and the lower electrode in a second-occurring write period in the second vertical scanning period. ### Claim 5 (depends on 1) The liquid crystal display device of claim 1, wherein the second potential difference V2 is 80% or more of the potential difference V0 in the black displaying state. ### Claim 6 (depends on 1) The liquid crystal display device of claim 1, wherein the second potential difference V2 is substantially equal to the potential difference V0 in the black displaying state. ### Claim 7 (depends on 1) The liquid crystal display device of claim 1, wherein the first potential difference V1 is 54% or less of the potential difference V0 in the black displaying state. ### Claim 8 (depends on 1) The liquid crystal display device of claim 1, wherein the first potential difference V1 is 47% or less of the potential difference V0 in the black displaying state. ### Claim 9 (depends on 1) The liquid crystal display device of claim 1, wherein the first potential difference V1 is 30% or more of the potential difference V0 in the black displaying state. ### Claim 10 (depends on 1) The liquid crystal display device of claim 1, wherein, in the transparent displaying state; liquid crystal molecules in the liquid crystal layer take a twist alignment. ### Claim 11 (depends on 10) The liquid crystal display device of claim 10, wherein, in the white displaying state and in the transparent displaying state, liquid crystal molecules near a center of the liquid crystal layer along a thickness direction are aligned so as to be substantially orthogonal to the predetermined direction. ### Claim 12 (depends on 1) The liquid crystal display device of claim 1, wherein the liquid crystal layer comprises liquid crystal molecules having positive dielectric anisotropy. ### Claim 13 (depends on 1) The liquid crystal display device of claim 1, further comprising an illumination element capable of switchably irradiating the liquid crystal display panel with a plurality of color rays including red light; green light, and blue light, the liquid crystal display device performing multicolor displaying by a field sequential method. ### Claim 14 (depends on 1) The liquid crystal display device of claim 1, wherein the liquid crystal display panel includes no color filters. ### Claim 15 A liquid crystal display device comprising a liquid crystal display panel and having a pixel, the liquid crystal display panel including a first substrate and a second substrate opposed to each other and a liquid crystal layer interposed between the first substrate and the second substrate, wherein, the first substrate includes an upper electrode provided for the pixel, and a lower electrode disposed under the upper electrode via an insulating layer, the lower electrode generating a lateral field across the liquid crystal layer with the upper electrode; the second substrate includes a counter electrode opposed to the upper electrode and the lower electrode, the counter electrode generating a vertical field across the liquid crystal layer with the upper electrode and the lower electrode; the pixel is capable of switchably presenting a black displaying state of performing black displaying with a vertical field generated across the liquid crystal layer, a white displaying state of performing white displaying with a lateral field generated across the liquid crystal layer, or a transparent displaying state in which a rear face side of the liquid crystal display panel is visible in a see-through manner with no voltage being applied to the liquid crystal layer; the upper electrode includes a plurality of branch portions extending along a predetermined direction, and at least one slit interposed between two mutually adjacent branch portions among the plurality of branch portions; each of the plurality of branch portions has a width L which is smaller than a width S of each of the at least one slit; one vertical scanning period includes at least one write period in which a displaying voltage is written to the pixel; a vertical scanning period is designated a first vertical scanning period, and a vertical scanning period that immediately follows the first vertical scanning period is designated a second vertical scanning period, and (A) when the first vertical scanning period and the second vertical scanning period are to display a same gray scale level and the pixel is to perform white displaying in the second vertical scanning period, the second vertical scanning period includes a write period in which a first potential difference V1 which is 60% or less of a potential difference V0 between the lower electrode and the counter electrode in the black displaying state is to be given to the upper electrode and the lower electrode, (B) when the first vertical scanning period and the second vertical scanning period are to display different gray scale levels and the pixel is to perform white displaying in the second vertical scanning period, the second vertical scanning period includes a write period in which a second potential difference V2 being greater than the first potential difference V1 is to be given to the upper electrode and the lower electrode; in a write period in which the first potential difference V1 is to be given to the upper electrode and the lower electrode, substantially a same potential as that of the counter electrode is given to the lower electrode, and a different potential from that of the counter electrode is given to the upper electrode; and in a write period in which the second potential difference V2 is to be given to the upper electrode and the lower electrode, substantially a same potential as that of the counter electrode is given to the lower electrode, and a different potential from that of the counter electrode is given to the upper electrode. ### Claim 16 (depends on 15) The liquid crystal display device of claim 15, wherein, one vertical scanning period includes two said write periods; and in case (B), in each of a first-occurring write period and a second-occurring write period in the second vertical scanning period, the second potential difference V2 is given to the upper electrode and the lower electrode. ### Claim 17 (depends on 15) The liquid crystal display device of claim 15, wherein, one vertical scanning period includes two said write periods; and in case (A), in each of a first-occurring write period and a second-occurring write period in the second vertical scanning period, the first potential difference V1 is given to the upper electrode and the lower electrode. ### Claim 18 (depends on 15) The liquid crystal display device of claim 15, wherein, one vertical scanning period includes two said write periods; and in case (A), the second potential difference V2 is given to the upper electrode and the lower electrode in a first-occurring write period in the second vertical scanning period, and the first potential difference V1 is given to the upper electrode and the lower electrode in a second-occurring write period in the second vertical scanning period.