TW201342342A - 液晶顯示裝置、液晶顯示裝置之驅動方法 - Google Patents

液晶顯示裝置、液晶顯示裝置之驅動方法 Download PDF

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TW201342342A
TW201342342A TW102103341A TW102103341A TW201342342A TW 201342342 A TW201342342 A TW 201342342A TW 102103341 A TW102103341 A TW 102103341A TW 102103341 A TW102103341 A TW 102103341A TW 201342342 A TW201342342 A TW 201342342A
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potential
signal line
liquid crystal
display device
crystal display
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TWI550572B (zh
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Kohji Saitoh
Akihisa Iwamoto
Jun Nakata
Masaki Uehata
Tomohiko Nishimura
Masami Ozaki
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Sharp Kk
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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
    • G09G3/36—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
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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
    • G02F1/136277—Active matrix addressed cells formed on a semiconductor substrate, e.g. of silicon
    • 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
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • 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
    • G09G3/3674—Details of drivers for scan electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
    • H01L27/1225—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
    • 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
    • G09G2310/0243—Details of the generation of driving signals
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/067—Special waveforms for scanning, where no circuit details of the gate driver are given
    • 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
    • G09G2320/0204—Compensation of DC component across the pixels in flat panels
    • 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
    • G09G2330/027—Arrangements or methods related to powering off a 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
    • 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
    • G09G3/3614—Control of polarity reversal in general

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  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

本發明係一種液晶顯示裝置，其包括資料信號線、掃描信號線、像素電極、連接於資料信號線及掃描信號線和像素電極之電晶體、及共通電極，且係在電源斷開之序列中使掃描信號線之電位變動而使電晶體導通者，且掃描信號線之電位係於開始變動後在第1時序上升至第1電位，而在第1時序之後的第2時序之對資料信號線之輸出電位，設定為比在第2時序之對共通電極之輸出電位更高。如此，作為液晶顯示裝置之電源斷開之準備而導通電晶體之情形下，即便伴隨著電晶體從導通之狀態斷開而在像素電極中產生電位變動(回掃電壓)，亦難以對像素施加DC電壓。

Description

液晶顯示裝置、液晶顯示裝置之驅動方法
本發明係關於液晶顯示裝置。
若藉由液晶顯示裝置斷開電源時像素電極中殘留之電荷對像素(包含像素電極及對置電極及由該等夾持之液晶之液晶電容)施加DC電壓則會產生留痕或閃爍，損害作為液晶顯示裝置之可靠性。
專利文獻1中，揭示有在液晶顯示裝置電源斷開之序列中導通電晶體且有目的性之將像素電極中殘留之電荷進行放電之技術。
[先前技術文獻] [專利文獻]
[專利文獻1]日本專利特開2006-011311號公報
發明者等人發現如專利文獻1即便在斷開電源之序列中導通電晶體來進行像素電極之放電，電晶體從導通至斷開時(變動電晶體之閘極電極之電位)藉由像素周圍之寄生電容對像素電極產生電位變動(回掃電壓)，藉此出現對像素(液晶電容)施加DC電壓之問題，特別是電晶體之斷開特性良好之液晶顯示裝置中(為抑制經由電晶體之自然放電)此之DC電壓之施加時間變長。
本發明之目的係在液晶顯示裝置之斷開電源序列中導通電晶體之情形下，即便電晶體伴隨著導通至斷開而在像素電極中產生電位變動(回掃電壓)也難以對像素施加DC電壓。
本液晶顯示裝置之特徵在於，包括：資料信號線、掃描信號線、像素電極、連接於資料信號線及掃描信號線和像素電極之電晶體、及共通電極，且係在電源斷開之序列中使掃描信號線之電位變動而使電晶體導通者，且，掃描信號線之電位係於開始變動後在第1時序上升至第1電位，在第1時序之後之第2時序之對資料信號線之輸出電位設定為比在第2時序之對共同電極之輸出電位更高。
根據本液晶顯示裝置，在斷開電源時導通電晶體之情形下，即便伴隨著電晶體從導通至斷開而在像素電極中產生回掃電壓也難以對像素施加DC電壓。
a-Si‧‧‧非晶矽
AM‧‧‧主動式矩陣基板
CMD‧‧‧共通電極驅動器
COM‧‧‧共通電極
DCC‧‧‧顯示控制電路
G1‧‧‧掃描信號線
G2‧‧‧掃描信號線
G3‧‧‧掃描信號線
GD‧‧‧閘極驅動器
Gn‧‧‧掃描信號線
Gn-1‧‧‧掃描信號線
GPW‧‧‧電源電位
LCD‧‧‧液晶顯示裝置
LCP‧‧‧液晶面板
LTPS‧‧‧低溫多晶矽面板
ON‧‧‧導通
OFF‧‧‧斷開
PE‧‧‧像素電極
PWC‧‧‧電源電路
SD‧‧‧源極驅動器
SL‧‧‧資料信號線
Ta‧‧‧時刻
Tb‧‧‧時刻
Td‧‧‧時刻
TD‧‧‧時刻
Te‧‧‧時刻
Tg‧‧‧時刻
Ti‧‧‧時刻
TR‧‧‧電晶體
VB/Vb‧‧‧黑顯示電位
Vcom‧‧‧中心電位
Vgd‧‧‧接地電位
VGH‧‧‧閘極導通電位
VGL‧‧‧閘極斷開電位
Vng‧‧‧輸出負電位
Vos‧‧‧偏移電位
Vou‧‧‧偏移電位
VSH‧‧‧最高階度電位
VSL‧‧‧最低階度電位
Vth‧‧‧電晶體之閾值電位
圖1係顯示實施形態1之電源斷開序列之時序圖。
圖2係顯示實施形態1之液晶顯示裝置之方塊圖。
圖3係圖2之一部分之等效電路圖。
圖4係顯示實施形態1之電源斷開序列(包含資料信號線之電位變動)之時序圖。
圖5係顯示實施形態1之電源斷開序列(包含像素電極之電位變動)之時序圖。
圖6係顯示實施形態1之電源斷開序列(包含共通電極之電位變動)之時序圖。
圖7係顯示實施形態1之其他形態之時序圖。
圖8係顯示實施形態2之電源斷開序列之時序圖。
圖9係顯示實施形態2之斷開序列(包含資料信號線之電位變動)之時序圖。
圖10係顯示實施形態2之電源斷開序列(包含像素電極之電位變動)之時序圖。
圖11係顯示實施形態2之電源斷開序列(包含共通電極之電位變動)之時序圖。
圖12係顯示實施形態3之電源斷開序列之時序圖。
圖13係顯示實施形態3之電源斷開序列(包含資料信號線之電位變動)之時序圖。
圖14係顯示實施形態3之電源斷開序列(包含像素電極之電位變動)之時序圖。
圖15係顯示實施形態3之電源斷開序列(包含共通電極之電位變動)之時序圖。
圖16係顯示圖13之變化例之時序圖。
圖17係顯示圖14之變化例之時序圖。
圖18係顯示圖15之變化例之時序圖。
圖19係顯示實施形態3之其他形態之時序圖。
圖20係顯示各實施形態中對各驅動器供給電源狀態之一例之時序圖。
圖21係顯示各實施形態中對各驅動器供給電源狀態與掃描信號線電位之相關之一例之時序圖。
圖22係顯示各實施形態中對各驅動器供給電源狀態與掃描信號線電位之相關之其他例之時序圖。
圖23係顯示氧化物半導體特性之圖表。
圖24係顯示參考例之電源斷開序列之時序圖。
圖25係顯示參考例之電源斷開序列(包含資料信號線之電位變動) 之時序圖。
圖26係顯示參考例之電源斷開序列(包含共通電極之電位變動)之時序圖。
圖27係顯示參考例之電源斷開序列(包含共通電極之電位變動)之時序圖。
基於圖1至圖27說明本發明之實施形態，如以下所述。
[實施形態1]
圖2係顯示本液晶顯示裝置之構成之方塊圖，圖3為圖2之一部分之等效電路圖。如圖2、圖3所示，實施形態1之液晶顯示裝置LCD包括：液晶面板LCP，其包含2個基板(未圖示)及夾於該等基板間之液晶層(未圖示)；顯示控制電路DCC；源極驅動器SD；閘極驅動器GD；共通電極驅動器CMD；電源電路PWC；及電源控制電路PCC。
液晶面板LCP包含掃描信號線G1至Gn、資料信號線SL、像素電極PE、電晶體(薄膜電晶體、TFT)TR、及共通電極COM。電晶體TR其閘極電極連接於掃描信號線G1，其源極電極連接於資料信號線SL，其汲極電極連接於像素電極PE，且如圖3所示，像素Pix之像素電極PE及共通電極COM和液晶層構成像素電容(液晶電容)Clc。再者，於電晶體TR之閘極電極(掃描信號線G1)與電晶體TR之汲極電極(像素電極PE)之間形成有寄生電容Cgd。
源極驅動器SD係驅動資料信號線SL(生成對資料信號線SL之輸出電位)，閘極驅動器GD係驅動掃描信號線G1至Gn，共通電極驅動器CMD係驅動共通電極COM(生成對共通電極COM之輸出電位)，顯示控制電路DCC包含時序控制器及影像處理電路等而構成，且控制源極驅動器SD、閘極驅動器GD及共通電極驅動器CMD。電源控制電路PCC係依據來自使用者或系統之指示而控制電源電路PWC。電源電路 PWC接收電源控制電路PCC之控制，對源極驅動器SD、閘極驅動器GD及共通電極驅動器CMD供給各種電源電壓。
實施形態1之液晶顯示裝置中，如圖1所示，在時刻Ta接獲電源斷開之指示之情形時，在時刻Tb使掃描信號線G1至Gn之電位上升而導通電晶體TR，並且對資料信號線SL輸出偏移電位Vos並對共通電極COM輸出接地電位Vgd，在其後之時刻Tg斷開電晶體TR。
圖4至圖6中顯示圖1之詳細(時刻Tb以後之序列)。再者，液晶面板LCP係黑底顯示，電晶體TR之通道為N型，且設為閘極斷開電位VGL<接地電位Vgd<負驅動時最低階度電位VSL<偏移電位Vos<顯示中心電位(通常顯示時之共通電極之電位)Vcom<電晶體之閾值電位Vth<正驅動時最高階度電位VSH<閘極導通電位VGH。
首先，在時刻Tb開始提高掃描信號線G1之電位，並且對資料信號線SL輸出偏移電位Vos並對共通電極COM輸出接地電位Vgd。在時刻Td(第1時序)，掃描信號線G1之電位達到比電晶體之閾值電位Vth更高之閘極導通電位VGH(第1電位)。
接著在時刻Te，閘脈波信號之電位(掃描信號線G1之電位)轉為下降，且在掃描信號線G1之電位成為電晶體之閾值電位Vth之時刻Tg附近，電晶體TR斷開。
時刻Tg以後閘脈波信號之電位(掃描信號線G1之電位)係從電晶體之閾值電位Vth降至接地電位Vgd。此之期間由於電晶體TR斷開(電晶體TR之源極電極與像素電極PE之間電阻值非常高)，以寄生電容Cgd為起因，像素電極PE之電位係從偏移電位Vos降至接地電位Vgd(回掃電壓、參照圖5)。此之期間之共通電極COM之電位為接地電位Vgd，故在此處考慮到電晶體之閾值電位Vth和像素及電晶體周圍之各種電容(包含寄生電容)等，將偏移電位Vos設定為對接地電位Vgd施加回掃電壓(絕對值)之電位。
本實施形態1中，從時刻Tb至時刻Tg之期間，藉由對共通電極COM輸出接地電位Vgd並且對資料信號線SL輸出偏移電位Vos(>接地電位Vgd)，而在斷開電晶體TR之時刻Tg後即便產生像素電極PE之電位變動(回掃電壓)，亦有可大致消除像素電極PE及共通電極COM間之電位差(對像素Pix施加之DC電壓)之效果。
再者，圖24至圖27係顯示在時刻Tb中分別對資料信號線SL及共通電極COM輸出接地電位Vgd之情形之參考圖，且隨著像素電極PE之電位變動(回掃電壓)斷開電晶體TR之時刻Tg之後，斷開電源後(經由電晶體TR直至自然放電結束)，亦對像素電極PE及共通電極COM間(像素Pix)施加DC電壓。特別是電晶體TR之半導體層中使用氧化物半導體(例如包含銦、鎵及鋅之氧化物半導體InGaZnOx)之情形下，如後述之導通/斷開特性非常良好且不自然放電，故可對像素Pix長時間施加DC電壓。換言之，在電晶體TR之半導體層中使用氧化物半導體之情形時，本實施形態1之效果更為顯著。
實施形態1中，如圖7所示，亦可將提高掃描信號線G1之電位之時刻Td至時刻TD(比時刻Te早之時刻)之期間設為黑顯示期間。在黑顯示期間內，將Vcom輸出至共通電極COM，而另一方面，令與Vcom相比更靠向正側之黑顯示電位VB、及與Vcom相比更靠向負側之黑顯示電位Vb(第5電位)交替地輸出至資料訊號線，而在結束黑顯示期間之時刻Tc中，對共通電極COM輸出接地電位Vgd並且對資料信號線SL輸出偏移電位Vos(>接地電位Vgd)。
[實施形態2]
實施形態2之液晶顯示裝置之構成係如圖2。實施形態2之液晶顯示裝置中，如圖8至圖11所示，首先在時刻Tb將掃描信號線G1之電位從閘極斷開電位VGL開始上升，且若對資料信號線SL輸出偏移電位Vou並且對共通電極COM輸出顯示中心電位Vcom，則在時刻Td中資 料信號線SL對偏移電位Vou充電且共通電極COM對顯示中心電位Vcom充電。
接著在時刻Te，將閘脈波信號之電位(掃描信號線G1之電位)從作用電平VGH降低(下降)，接著在時刻Tg(第2時序)若閘脈波信號之電位(掃描信號線G1之電位)低於電晶體之閾值電位Vth則斷開電晶體TR。
時刻Tg之後，閘脈波信號之電位(掃描信號線G1之電位)係從電晶體之閾值電位Vth降低至接地電位Vgd。此之期間係由於電晶體TR斷開(電晶體TR之源極電極與像素電極PE之間之電阻值非常高)，故以寄生電容Cgd為起因，像素電極PE之電位從偏移電位Vou降低至顯示中心電位Vcom(回掃電壓，參照圖10)。此之期間共通電極COM之電位係顯示中心電位Vcom，故在此處考慮到電晶體之閾值電位Vth及像素和電晶體周圍之各種電容(包含寄生電容)等，將偏移電位Vou設定為對接地電位Vgd施加回掃電壓(絕對值)之電位。
[實施形態3]
實施形態3之液晶顯示裝置之構成係如圖2。實施形態2之液晶顯示裝置中，如圖12至15所示，首先，在時刻Tb開始提高掃描信號線G1之電位，並且對資料信號線SL輸出接地電位Vgd並且對共通電極COM輸出負電位Vng。在時刻Td(第1時序)，掃描信號線G1之電位係達到比電晶體之閾值電位Vth更高之閘極導通電位VGH(第1電位)。
接著在時刻Te，閘脈波信號之電位(掃描信號線G1之電位)係轉至下降，且在掃描信號線G1之電位成為電晶體之閾值電位Vth之時刻Tg附近斷開電晶體TR。
在時刻Tg以後，閘脈波信號之電位(掃描信號線G1之電位)係從電晶體之閾值電位Vth降低至接地電位Vgd。此之期間由於電晶體TR斷開(電晶體TR之源極電極與像素電極PE之間之電阻值非常高)，故以寄生電容Cgd為起因，像素電極PE之電位從接地電位Vgd降低至負電 位Vng(回掃電壓，參照圖14)。此之期間之共通電極COM之電位係接地電位Vgd，故在此處考慮到電晶體之閾值電位Vth及像素和電晶體周圍之各種電容(包含寄生電容)等，將負電位Vng設定為從接地電位Vgd減去回掃電壓(絕對值)之電位。
本實施形態3中，從時刻Tb至時刻Tg之間，藉由輸出資料信號線SL接地電位Vgd並且對共通電極COM輸出負電位Vng(<接地電位Vgd)，而斷開電晶體TR之時刻Tg以後，即便產生像素電極PE之電位變動(回掃電壓)，亦有可大致消除像素電極PE及共通電極COM間之電位差(對像素Pix施加DC電壓)之效果。
實施形態3中，如圖16所示，可將提高掃描信號線G1之電位之時刻Td至時刻TD(比時刻Te早之時刻)設為黑顯示期間。在黑顯示期間內，將Vcom輸出至共通電極COM，而另一方面，令與Vcom相比更靠向正側之黑顯示電位VB、及與Vcom相比更靠向負側之黑顯示電位Vb交替地輸出至資料訊號線，且在結束黑顯示期間之時刻TD中，輸出資料信號線SL接地電位Vgd並且對共通電極COM輸出負電位Vng。
從圖13至圖15中，雖設為Vng<Vgd<VSL<Vcom<VSH，但未受此限定。例如，如圖17至圖19所示，也可設為VSL<Vcom<VNG<接地電位Vgd<VSH。如此，僅為了電源斷開序列而可節省製作負電位之勞力時間。
[關於上述各實施形態]
上述各實施形態中，如圖20所示，從電源電路PWC對各驅動器D(GD．SD．CMD)供給電源係在時刻Ta停止，且依據各驅動器D(GD．SD．CMD)之殘留電壓，進行自時刻Ta至時刻Ti之序列。但，在時刻Ti之前，亦可從電源電路PWC對各驅動器進行電源供給。
又，上述各實施形態之液晶顯示裝置中，對各驅動器D(GD．SD．CMD)供給電源係在時刻Ta停止，故例如對閘極驅動器供給 電源電位GPW係如圖21維持至時刻Te但在時刻Te以後因自然放電而降低。再者，此電源電位GPW在時刻Tb全部降低之情形係如圖22所示。圖22之情形係將掃描信號線G1之電位提高至比時刻Td(第1時序)之電晶體之閾值電位Vth更高之電位(第1電位，比閘極導通電位VGH更低之電位)而導通電晶體TR。
又，上述各實施形態之液晶顯示裝置中，作為液晶面板之電晶體，半導體層宜使用所謂氧化物半導體之TFT。作為此氧化物半導體係可例舉包含銦、鎵及鋅之氧化物半導體(InGaZnOx)。圖23中顯示使用氧化物半導體之TFT、使用a-Si(amorphous silicon：非晶矽)之TFT及使用LTPS(Low Temperature Poly Silicon：低溫多晶矽)之TFT之各個特性。在圖23中，橫軸(Vg)係供給至各TFT之閘極電壓值，且縱軸(Id)係各TFT之源極-汲極間之電流值(圖中顯示為「TFT-on」之期間係TFT成為導通狀態之期間，顯示為「TFT-off」之期間係顯示TFT成為斷開之狀態之期間)。如圖23所示，使用氧化物半導體之TFT與使用a-Si之TFT相比較，其導通電流值/斷開電流值為1000倍以上，具有非常優越之導通(ON)/斷開(OFF)特性。
即，使用氧化物半導體之TFT其斷開狀態時之洩漏電流為使用a-Si之TFT之100分之1左右，幾乎未產生洩漏電流，為斷開特性非常優異者。另一方面，由於斷開特性非常優異，故電源斷開時像素中長時間殘留電荷之可能性較高。
本液晶顯示裝置之特徵在於，其包括資料信號線、掃描信號線、像素電極、連接於資料信號線及掃描信號線和像素電極之電晶體、及共通電極，且其係在電源斷開之序列中使掃描信號線之電位變動而使電晶體導通者，且，掃描信號線之電位係於開始變動後在第1時序上升至第1電位，在第1時序之後之第2時序之對資料信號線之輸出電位設定為比在第2時序之對共通電極之輸出電位更高。
根據上述構成，可於電源斷開之序列中，在第1時序之後使電晶體導通而進行像素電極之放電。而且，在第1時序之後之第2時序之對資料信號線之輸出電位設定為比在第2時序之對共通電極之輸出電位更高，故即便伴隨著電晶體從導通之狀態斷開而在像素電極中產生電位之下降(回掃電壓)，也難以對包含該像素電極之像素施加DC電壓。
本液晶顯示裝置中，也可構成為在第2時序之對共通電極之輸出電位為第2電位，在第2時序之對資料信號線之輸出電位為第3電位。
本液晶顯示裝置中，也可構成為在第2時序之對共通電極之輸出電位為第4電位，在第2時序之對資料信號線之輸出電位為第2電位。
本液晶顯示裝置中，也可構成為上述第1電位係電晶體之閾值電位以上。
本液晶顯示裝置中，也可構成為上述第2電位係接地電位。
本液晶顯示裝置中，也可構成為第4電位比接地電位更低。
本液晶顯示裝置中，也可構成為通常顯示時之共通電極之電位係第4電位。
本液晶顯示裝置中，也可構成為於第1時序之後，使對共通電極之輸出電位一旦設為第5電位後設為第2電位，並且使對資料信號線之輸出電位一旦設為第6電位後設為第3電位。
本液晶顯示裝置中，也可構成為於第1時序之後，使對共通電極之輸出電位一旦設為第5電位後設為第3電位，並且使對資料信號線之輸出電位一旦設為第6電位後設為第2電位。
本液晶顯示裝置中，也可構成為藉由一面使對共通電極之輸出電位設為第5電位，一面自資料信號線對上述像素電極寫入上述第6電位，而使包含該像素電極之像素成為黑顯示。
本液晶顯示裝置中，也可構成為包括：資料信號線驅動電路，其係生成對資料信號線之輸出電位；共通電極驅動電路，其係生成對 共通電極之輸出電位；及控制電路，其係控制資料信號線驅動電路及共通電極驅動電路。
本液晶顯示裝置中，也可構成為在上述電晶體之半導體層中使用氧化物半導體。
本液晶顯示裝置中，也可構成為上述氧化物半導體包含銦、鎵及鋅。
本液晶顯示裝置之驅動方法之特徵在於，其係對於包含資料信號線、掃描信號線、像素電極、連接於資料信號線及掃描信號線和像素電極之電晶體、及共通電極之液晶顯示裝置，在電源斷開之序列中使掃描信號線之電位變動而使電晶體導通者，且掃描信號線之電位係於開始變動後在第1時序上升至第1電位，將在第1時序之後之第2時序對資料信號線之輸出電位設定為比在第2時序之對共通電極之輸出電位更高。
本發明係未受上述之實施形態所限定，且基於技術常識適當變更上述實施形態之者或組合其所獲得之者也包含於本發明之實施形態中。
[產業上可利用性]
本發明之液晶顯示裝置係例如適用於各種液晶顯示器或液晶電視機中。
COM‧‧‧共通電極
G1‧‧‧掃描信號線
G2‧‧‧掃描信號線
G3‧‧‧掃描信號線
Gn‧‧‧掃描信號線
Gn-1‧‧‧掃描信號線
PE‧‧‧像素電極
SL‧‧‧資料信號線
Ta‧‧‧時刻
Td‧‧‧時刻
Tg‧‧‧時刻
Vcom‧‧‧中心電位
Vgd‧‧‧接地電位
Vos‧‧‧偏移電位

Claims (14)

  1. 一種液晶顯示裝置，其包括資料信號線、掃描信號線、像素電極、連接於資料信號線及掃描信號線和像素電極之電晶體、及共通電極，且係在電源斷開之序列中使掃描信號之電位變動而使電晶體導通者，且掃描信號線之電位係於開始變動後在第1時序上升至第1電位；在第1時序之後之第2時序之對資料信號線之輸出電位設定為比在第2時序之對共通電極之輸出電位更高。
  2. 如請求項1之液晶顯示裝置，其中在第2時序之對共通電極之輸出電位為第2電位，且在第2時序之對資料信號線之輸出電位為第3電位。
  3. 如請求項1之液晶顯示裝置，其中在上述第2時序之對共通電極之輸出電位為第4電位，且在第2時序之對資料信號線之輸出電位為第2電位。
  4. 如請求項1之液晶顯示裝置，其中上述第1電位係電晶體之閾值電位以上。
  5. 如請求項2或3之液晶顯示裝置，其中上述第2電位係接地電位。
  6. 如請求項3之液晶顯示裝置，其中第4電位比接地電位更低。
  7. 如請求項6之液晶顯示裝置，其中通常顯示時之共通電極之電位為第4電位。
  8. 如請求項2之液晶顯示裝置，其中於第1時序之後，使對共通電極之輸出電位一旦設為第5電位後設為第2電位，且使對資料信號線之輸出電位一旦設為第6電位後設為第3電位。
  9. 如請求項3之液晶顯示裝置，其中於第1時序之後，使對共通電 極之輸出電位一旦設為第5電位後設為第3電位，且使對資料信號線之輸出電位一旦設為第6電位後設為第2電位。
  10. 如請求項8或9之液晶顯示裝置，其中藉由一面將上述對共通電極之輸出電位設為第5電位，一面自資料信號線對上述像素電極寫入上述第6電位，使包含該像素電極之像素成為黑顯示。
  11. 如請求項1之液晶顯示裝置，其包括：資料信號線驅動電路，其係生成對資料信號線之輸出電位；共通電極驅動電路，其係生成對共通電極之輸出電位；及控制電路，其係控制資料信號線驅動電路及共通電極驅動電路。
  12. 如請求項1至11中任一項之液晶顯示裝置，其中上述電晶體之半導體層中使用氧化物半導體。
  13. 如請求項12之液晶顯示裝置，其中上述氧化物半導體包含銦、鎵及鋅。
  14. 一種液晶顯示裝置之驅動方法，其係對於包括資料信號線、掃描信號線、像素電極、連接於資料信號線及掃描信號線和像素電極之電晶體、及共通電極之液晶顯示裝置，在電源斷開之序列中使掃描信號線之電位變動而使電晶體導通者，且掃描信號線之電位係於開始變動後在第1時序上升至第1電位；將在第1時序之後之第2時序之對資料信號線之輸出電位設定為比在第2時序之對共通電極之輸出電位更高。
TW102103341A 2012-01-31 2013-01-29 液晶顯示裝置、液晶顯示裝置之驅動方法 TWI550572B (zh)

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