WO2012124623A1 - Dispositif d'affichage à cristaux liquides et procédé de commande associé - Google Patents

Dispositif d'affichage à cristaux liquides et procédé de commande associé Download PDF

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Publication number
WO2012124623A1
WO2012124623A1 PCT/JP2012/056107 JP2012056107W WO2012124623A1 WO 2012124623 A1 WO2012124623 A1 WO 2012124623A1 JP 2012056107 W JP2012056107 W JP 2012056107W WO 2012124623 A1 WO2012124623 A1 WO 2012124623A1
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WO
WIPO (PCT)
Prior art keywords
period
potential
liquid crystal
image
subframe
Prior art date
Application number
PCT/JP2012/056107
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English (en)
Japanese (ja)
Inventor
小川　康行
山本　薫
Original Assignee
シャープ株式会社
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Filing date
Publication date
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Publication of WO2012124623A1 publication Critical patent/WO2012124623A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133601—Illuminating devices for spatial active dimming
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/30—Gray scale
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0871—Several active elements per pixel in active matrix panels with level shifting
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation

Definitions

  • liquid crystal display devices that perform color display include a color filter that transmits red (R), green (G), and blue (B) light for each sub-pixel obtained by dividing one pixel into three.
  • RGB red
  • G green
  • B blue
  • the color filter type liquid crystal display device since about 2/3 of the backlight light applied to the liquid crystal panel is absorbed by the color filter, the color filter type liquid crystal display device has a problem that the light use efficiency is low. Therefore, a field sequential type liquid crystal display device that performs color display without using a color filter has attracted attention.
  • one screen display period (one frame period) is divided into three subframe periods.
  • the subframe period is also called a subfield, but in the following description, the term “subframe period” is used as a unit.
  • a red screen is displayed based on the red component of the input signal.
  • a green screen is displayed based on the green component of the input signal.
  • a blue screen is displayed based on the blue component of the input signal.
  • one frame period is divided into three subframe periods, and it is necessary to rewrite the image data for the entire display unit for each subframe period. For this reason, high-speed driving is required as compared with the color filter method.
  • color breaks color breaks
  • driving may be performed at a high frame rate to prevent color breaks.
  • the response of the liquid crystal may not follow the rewrite and the display quality may deteriorate.
  • the backlight can be turned on. As described above, it is possible to lengthen the lighting time of the backlight.
  • the capacity provided for each pixel is one.
  • the image data is fetched line by line, and the image for one frame is displayed all at once after the capture of the image data for all lines is completed.
  • Japanese Unexamined Patent Application Publication No. 2009-134156 discloses a technique for preventing the occurrence of color breakup with respect to a field sequential image display apparatus.
  • Japanese Unexamined Patent Publication No. 11-295694 Japanese Unexamined Patent Publication No. 3-18892 Japanese Unexamined Patent Publication No. 8-95526 Japanese Unexamined Patent Publication No. 2001-272657 Japanese Unexamined Patent Publication No. 2009-134156
  • a first aspect of the present invention is a liquid crystal display device that displays an image by dividing one frame period into a plurality of subframe periods, A plurality of video signal lines for transmitting video signals, a plurality of scanning signal lines intersecting with the plurality of video signal lines, and corresponding to intersections of the plurality of video signal lines and the plurality of scanning signal lines, each including a pixel electrode.
  • the pixel circuit includes: A data storage unit capable of storing binary data; A data output unit for applying either a relatively high potential or a relatively low potential to the pixel electrode according to the value of the binary data stored in the data storage unit, Each subframe period consists of a preceding first period and a subsequent second period, In the first period, The plurality of scanning signal lines are sequentially selected, In all the pixel circuits, when a scanning signal line passing through the corresponding intersection is selected, binary data having a value corresponding to the potential of the video signal applied to the video signal line passing through the intersection is the data. Stored in the storage unit, In the second period, The backlight is turned off, In all of the pixel circuits, a potential corresponding to the value of the binary data stored in the data storage unit is applied to the pixel electrode.
  • a sixth aspect of the present invention is the fifth aspect of the present invention, When attention is paid to k consecutive subframe periods, the k subframe periods are classified into different groups.
  • the same effect as in the first and fourth aspects of the present invention can be obtained.
  • FIG. 5 is a signal waveform diagram for explaining the operation of a unit pixel whose corresponding bit value is 1 in a subframe period in which a common electrode potential changes from a low level to a high level in the embodiment.
  • FIG. 6 is a signal waveform diagram for explaining an operation of a unit pixel whose corresponding bit value is 0 in a subframe period in which a common electrode potential changes from a low level to a high level in the embodiment.
  • FIG. 6 is a signal waveform diagram for explaining the operation of a unit pixel whose corresponding bit value is 1 in a subframe period in which a common electrode potential changes from a high level to a low level in the embodiment.
  • FIG. 4 is a diagram for explaining how an image for one frame is displayed in the present embodiment.
  • the backlight brightness indicates that the longer the length of the vertical axis, the higher the brightness (the same applies to FIGS. 15, 16, 17, and 19).
  • one frame period is composed of (n ⁇ 3) subframe periods.
  • “n” represents the number of bits of data of each color. For example, if each color data is 6 bits (that is, 64 gradations), one frame period is composed of 18 subframe periods, and if each color data is 8 bits (that is, 256 gradations). 1) One frame period is composed of 24 subframe periods.
  • the thin film transistor M3 when the potential of the internal node is 5V, the thin film transistor M3 is turned on, and when the potential of the internal node is 0V, the thin film transistor M3 is turned off.
  • the common power supply potential VL changes from the high level to the low level. Therefore, when the thin film transistor M3 is in the on state at time t13, the low-level common power supply potential VL is applied to the pixel electrode 11.
  • the thin film transistor M3 is in the off state at the time point t13, a state where a relatively high potential is applied to the pixel electrode 11 is maintained.
  • the first in the next subframe period is white display is performed during the period.
  • FIG. 8 is a signal waveform diagram for explaining the operation of the unit pixel in which the value of the corresponding bit is 0 in the subframe period in which the common electrode potential Vcom changes from the low level to the high level.
  • the scanning signal GL is at a high level.
  • the thin film transistor M1 is turned on.
  • the video signal SL is at a potential indicating a value “0” (here, 0 V)
  • the internal node is at a potential indicating a value “0” (here, 0 V).
  • the lighting color of the backlight is switched every time the subframe period is switched.
  • display colors are frequently switched, and the occurrence of color breaks (color breaks) when displaying moving images is effectively suppressed.
  • FIG. 17 is a diagram for explaining how an image for one frame is displayed in the present modification.
  • display corresponding to the first bit of the left-eye image is performed in the subframe period indicated as “L1” in the display data column, and “R2” is indicated in the display data column.
  • display corresponding to the second bit of the right-eye image is performed.
  • one frame period is composed of (n ⁇ 4) subframe periods.
  • “n” represents the number of bits of data constituting each unit image (left eye image, right eye image).
  • the (n ⁇ 4) subframe periods constituting one frame period are classified so that one group includes (n ⁇ 2) subframe periods. Specifically, as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

Un dispositif d'affichage à cristaux liquides permettant de diviser une période de trame unique en une pluralité de périodes de sous-trames et d'afficher une image offre à la fois une commande à grande vitesse et une faible consommation d'énergie. Un circuit de pixels est configuré de manière fonctionnelle afin de comprendre un circuit échantillonneur-bloqueur pour contenir un bit de données d'après le potentiel d'un signal vidéo, et un circuit de décalage de niveau pour convertir un niveau entre le potentiel du signal vidéo et le potentiel d'une électrode de pixel. Une période de trame unique comprend n×3 périodes de sous-trames (où n est le nombre de bits de données pour chacune des couleurs), et chacune des périodes de sous-trames comprend une première période (T1) et une seconde période (T2). Au cours de la première période (T1), les données conformément au potentiel du signal vidéo sont contenues dans le circuit échantillonneur-bloqueur de façon séquentielle, une ligne à la fois. Au cours de la seconde période (T2), un rétroéclairage est éteint, et un potentiel conformément aux données contenues dans le circuit échantillonneur-bloqueur est appliqué simultanément aux électrodes de pixels dans tout le circuit de pixels par le circuit de décalage de niveau.
PCT/JP2012/056107 2011-03-17 2012-03-09 Dispositif d'affichage à cristaux liquides et procédé de commande associé WO2012124623A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011059096 2011-03-17
JP2011-059096 2011-03-17

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WO2012124623A1 true WO2012124623A1 (fr) 2012-09-20

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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63113426A (ja) * 1986-09-20 1988-05-18 ソーン　イーエムアイ　ピーエルシー 表示装置の動作方法および表示装置
US4907862A (en) * 1985-03-05 1990-03-13 Oy Lohja Ab Method for generating elecronically controllable color elements and color display based on the method
JPH10322726A (ja) * 1997-05-15 1998-12-04 Sanyo Electric Co Ltd プラズマディスプレイパネルを用いた時分割メガネ方式の立体映像表示方法
JPH11295694A (ja) * 1998-04-08 1999-10-29 Hoshiden Philips Display Kk 液晶表示装置
JP2000112428A (ja) * 1998-10-05 2000-04-21 Nippon Hoso Kyokai <Nhk> 立体画像表示方法および装置
JP2001159883A (ja) * 1999-09-20 2001-06-12 Seiko Epson Corp 電気光学装置の駆動方法、駆動回路および電気光学装置ならびに電子機器
JP2001175216A (ja) * 1999-10-04 2001-06-29 Matsushita Electric Ind Co Ltd 高階調度表示技術
WO2001069584A1 (fr) * 2000-03-14 2001-09-20 Mitsubishi Denki Kabushiki Kaisha Afficheur d'image et procede d'affichage d'image
JP2009134156A (ja) * 2007-11-30 2009-06-18 Univ Of Electro-Communications 画像表示の信号処理方法及び画像表示装置
WO2010087263A1 (fr) * 2009-01-28 2010-08-05 日本電気株式会社 Système et procédé de transmission d'image

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4907862A (en) * 1985-03-05 1990-03-13 Oy Lohja Ab Method for generating elecronically controllable color elements and color display based on the method
JPS63113426A (ja) * 1986-09-20 1988-05-18 ソーン　イーエムアイ　ピーエルシー 表示装置の動作方法および表示装置
JPH10322726A (ja) * 1997-05-15 1998-12-04 Sanyo Electric Co Ltd プラズマディスプレイパネルを用いた時分割メガネ方式の立体映像表示方法
JPH11295694A (ja) * 1998-04-08 1999-10-29 Hoshiden Philips Display Kk 液晶表示装置
JP2000112428A (ja) * 1998-10-05 2000-04-21 Nippon Hoso Kyokai <Nhk> 立体画像表示方法および装置
JP2001159883A (ja) * 1999-09-20 2001-06-12 Seiko Epson Corp 電気光学装置の駆動方法、駆動回路および電気光学装置ならびに電子機器
JP2001175216A (ja) * 1999-10-04 2001-06-29 Matsushita Electric Ind Co Ltd 高階調度表示技術
WO2001069584A1 (fr) * 2000-03-14 2001-09-20 Mitsubishi Denki Kabushiki Kaisha Afficheur d'image et procede d'affichage d'image
JP2009134156A (ja) * 2007-11-30 2009-06-18 Univ Of Electro-Communications 画像表示の信号処理方法及び画像表示装置
WO2010087263A1 (fr) * 2009-01-28 2010-08-05 日本電気株式会社 Système et procédé de transmission d'image

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