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TWI282082B - Driving method of multi-domain vertical alignment LCD - Google Patents

Driving method of multi-domain vertical alignment LCD Download PDF

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Publication number
TWI282082B
TWI282082B TW093102247A TW93102247A TWI282082B TW I282082 B TWI282082 B TW I282082B TW 093102247 A TW093102247 A TW 093102247A TW 93102247 A TW93102247 A TW 93102247A TW I282082 B TWI282082 B TW I282082B
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Taiwan
Prior art keywords
liquid crystal
line
signal
driving
crystal display
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Application number
TW093102247A
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English (en)
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TW200525482A (en
Inventor
Wang-Yang Li
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Chi Mei Optoelectronics Corp
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Priority to TW093102247A priority Critical patent/TWI282082B/zh
Priority to KR1020040113944A priority patent/KR100994550B1/ko
Priority to US11/032,426 priority patent/US7298353B2/en
Priority to JP2005005574A priority patent/JP2005215673A/ja
Publication of TW200525482A publication Critical patent/TW200525482A/zh
Application granted granted Critical
Publication of TWI282082B publication Critical patent/TWI282082B/zh

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3622Control of matrices with row and column drivers using a passive matrix
    • G09G3/3629Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
    • G09G3/3637Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals with intermediate tones displayed by domain size control
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/06Details of flat display driving waveforms
    • G09G2310/061Details of flat display driving waveforms for resetting or blanking
    • G09G2310/062Waveforms for resetting a plurality of scan lines at a time
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2007Display of intermediate tones
    • G09G3/207Display of intermediate tones by domain size control
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3622Control of matrices with row and column drivers using a passive matrix
    • G09G3/3644Control of matrices with row and column drivers using a passive matrix with the matrix divided into sections
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3674Details of drivers for scan electrodes
    • G09G3/3681Details of drivers for scan electrodes suitable for passive matrices only

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

Description

1282082
【發明所屬之技術領域】 本發明是有關於一種多顯示域垂直配向型(multi_ domain vertical alignment,MVA)液晶顯示器(Hquid crystal display’ LCD)的驅動方法,且特別是有關於— 種解決MVA液晶顯示器影像殘留(Image Retenti〇n)問題之 驅動方法。 【先前技術】 平板型螢幕顯不器(flat-panel display)由於比傳統 之陰極射線管顯示器(CRT display)有更輕薄的體積,且 也能提供咼晝質的顯示’因此已逐漸成為市場的主流顯示 器。薄膜電晶體液晶顯示器(thin-film-transistor liquid crystal display,TFT LCD)更是在平板型螢幕顯 示器中佔有主要的地位。但是一般的TFT LCD的視角較為 狹窄,造成其應用的限制。 多顯示域垂直配向型(multi-domain vertical al ignment,MVA)之液晶顯示器由於具有廣視角的特性, 因此係為業者所致力發展的目標。第1A至1C圖、纟會示為MVA LCD之一個像素的上視圖。此像素之透明電極11 〇係包括四 個顯示域(doma i η),此四個顯示域係為相連。第1 a圖繪示 為未施加電壓於像素的示意圖。此時液晶分子係為垂直於 透明電極11 0之平面,因此其上視圖係只看到液晶分子之 一端點,以一圓點表示。第1 B圖緣示為施加電壓於像素的 不意圖。施加電壓於像素時,液晶分子係朝向此四個顯示
TW0944F(奇美).ptd 第6頁 1282082 五、發明說明(2) 域的中心傾斜’因此使用者可以在更廣的視角看到螢幕所 顯示的影像。 第2A至2C圖為另一種MVA LCD之一個像素的上視圖。 第2A圖繪示為未施加電壓於像素的示意圖其中狹縫(slit) 21係位於LCD的下板’突塊(pr〇trusi〇n)22係為於LCD的上 板。第2B圖繪示為施加電壓於像素的示意圖。施加電壓於 像素日守’液曰曰为子依電%方向各自傾斜,分成多個顯示 域。 然而’當MVA LCD受到外界的驅動力量(Driving Force)後,例如是施加電場或是使用者的碰觸,受力後的 液晶分子若不依原設計方向來排列就會在螢幕上產生所謂 的斑點(nrnra)。例如第1C或2C圖所示為受外力後的像素的 示意圖。此時的液晶分子受到外力後會使其排列方向混 亂,以致液晶之穿透率改變。當外力消失後,此斑點並不 會隨之消失,造成螢幕上有影像殘留之品質缺陷。 【發明内容】 有鑑於此,本發明的目的就是在提供一種避免產生斑 點或影像殘留之MVA LCD的驅動方法。 根據本發明的目的,提出一種多顯示域垂直配向型 (multi-domain vertical alignment,MVA)之液晶顯示器 之驅動方法。液晶顯示器係接收一晝面訊號並據以顯示一 畫面。液晶顯示器包括多條掃瞄線。本驅動方法首先致能 此些掃瞄線之一,然後決定是否進行重置。若是,則以一
TW0944F(奇美).ptd 第7頁 1282082 五、發明說明(3) 低電慶驅動該掃蹈線上之像素;若否 此掃睡線上之像素。 狀旦曲Λ就驅動 W 明之上述目的、特徵、和優點能更明顯易 Ϊ如; 較佳實施例’並配合所附圖式,作詳細說 【實施方式】 當多顯示域垂直配向型(multi_d〇main ”忖 ,螢幕上受到屢力處會產生斑點(“之 =。第3A圖繪示為未施加電壓於像素之液晶分子的自由 :自?向,關係圖。穩定狀態時,液晶分子處於 第二 ^ 於後夺夕y曰\ ί 日為 電壓,例如是6伏特, 時ί自由能υ與排列方向以的關係圖。此 多個穩態,在此以兩個穩態_,點為 ί 液晶分子係處於請的穩態。但是有 外力知加後,液晶分子可台t翁^ $丨α
4jk ^ ^ 匕移到另一個穩態B,點,使得A 排歹方向改變。當外力消失後液晶分子的穩態維持:什,、 二使Ϊ穿透率改變,導致螢幕於施壓處顯示斑點。 在穩悲β點的液晶分子若施加_ : 特,然後再施加像素電壓,例如是主電壓,例如疋零伙 回復到穩態B點。此外力所引起之t伏特則液晶分子將 螢幕之顯示恢復正常。本發明之動即被消除,而使得 如月之驅動方法即依據此重置 第8頁 TTO944F(奇美).ptd 1282082 五、發明說明(4) (reset)的原理消除螢幕上的斑點。 一般的液晶螢幕係接收一畫面訊號並據以顯示一畫 面。其驅動方法係為致能此液晶螢幕之一掃瞄線(Scan Line),然後將各像素之像素電壓透過各像素相對應之訊 號線(Dat a L i ne )施加於此掃目苗線上的每一像素。像素電 壓係依據畫面訊號而產生。當所有的掃瞄線皆依序致能過 一次後,一個畫面即為完成。 請參照第4圖,其繪示依照本發明一較佳實施例的一 種MVA LCD之驅動方法流程圖。首先,致能此液晶螢幕之 一掃瞄線(步驟310)。然後決定是否進行重置(步驟32〇): 若是,則施加一低電壓於此掃瞄線上的像素(步驟 3 3 0 ),若否,則施加像素電壓於此掃猫線上的像素(步 驟340 )。 ” 在步驟330中,施加低電壓,例如是零伏特,於像素 後,液晶分子即回到初始穩態,如第3A圖中的穩態A點。 待下^此掃瞄線再被致能時,液晶分子即可依據施予之像 素電壓而,到正常之穩態。液晶螢幕的更新頻率例如是 6 0Hz,則母秒顯示6 〇個畫面。本發明於每次的晝面係選擇 一部分的掃瞄線進行斑點重置,因此若有因外^而產生的 斑點就會在重置過程中消失。而重置的時間很短,因此人 眼不易察覺。舉例來說,若要求產生之斑點需在2秒内消 失,則在2秒内將所有的掃瞄線進行過一次重置即可達成 要求。因此可以在2秒内的1 20張晝面中任插入一張皆由低 電壓驅動所形成的重置畫面,如此斑點即可在2秒内消
1282082 111 ——-- 五、發明說明(5) 除。或在每個畫面選摆都 些㈣線分程正常組匕:掃重置播例如將此 原定之晝面訊號驅動,屬於屬於f㊉組之掃猫線則以 動。以有1 024條掃瞄線之液線則以低電壓驅 選擇不同的1 024/(60*2) 幕為例’則需在每個畫面 内亦可消除斑點。如此每:^知猫線進行重置,則在2秒 組,其餘條掃晦線屬於:J:9,條掃猫線屬於重置 消除置所有的像素即可達成斑點 -個表袼,以實際測試結=屋不:,因此可以以建立 電壓。如此在驅動過程中,即階值之最大重置低 需之低電壓。這樣可以減 :面:J而決定重置所 品質。 錢夕畫面閃動的機會,增高畫面的 曰顯實施例所揭露之多顯示域垂直配向型之液 心综:3 ΪΪ可以消除因外力形成的斑點。 然其並非用以限定:明較佳實施例揭露如上, 本發明之精神和範圍;月當此在不脫離 ^月之保h㈣視後附之中請專利範圍所界定者為 TW0944F(奇美).ptd 第10頁 1282082 圖式簡單說明 【圖式之簡單說明】 第綠示為MVA LCD之一個像素的上視圖。 第2A至2C圖為另一種MVA LCD之—個像素的上視圖。 第3A圖繪不為未施加電壓於像素之液 ϋ與排列方向LC的關係圖。 于的自由月匕 第3Β圖繪示為施加電壓,例如 晶分子的自由能U與排列方向Lc的關係:,則象素之液 第4圖緣示依照本發明一較佳杂二二二 驅動方法流程圖。 牷戰鉍例的一種MVA LCD之 圖式標號說明】 11 0 :透明電極
TW0944F(奇美).ptd $ 11頁

Claims (1)

1282082 六、申請專利範圍 1· 一種多顯示域垂直配向型(multi—d〇main vertical alignment,MVA)之液晶顯示器之驅動方 液晶顯不器係接收一畫面訊號並據以顯示一晝面, 顯示器包括複數條掃瞄線,該驅動方法包括: 致能該些掃瞄線之一; 決定是否進行重置,若是,則以一低電壓驅動 線上之像素,若否,則依該畫面訊號驅動該掃瞄線 素。 2 ·如申請專利範圍第1項所述之驅動方法,其 晶顯示器係顯示複數個畫面,該些畫面之一係由該 驅動。 3· 如申請專利範圍第1項所述之驅動方法,其 晶顯示器係顯示複數個晝面,各該些畫面之部分掃 的像素係由該低電壓驅動。 4· 如申請專利範圍第1項所述之驅動方法,其 電壓係依據該畫面訊號而產生。 5. —種多顯示域垂直配向型(multi-domain vertical alignment,MVA)之液晶顯示器之驅動方 液晶顯示器係接收一晝面訊號並據以顯示一畫面, 顯示器包括複數條掃瞄線,該驅動方法包括: 決定是否對該晝面進行重置,若是,則依據一 顯示該畫面,若否,則依該晝面訊號顯示該畫面。 6. —種多顯示域垂直配向型(mul ti-domain vertical alignment, MVA)之液晶顯示器之驅動方 法,該 该液晶 該掃瞄 上之像 中該液 低電壓 中該液 瞄線上 中該低 法,該 該液晶 低電壓 法,該
TW0944F(奇美).ptd 第12頁 1282082 六、申請專利範圍 液晶顯示器係接收一畫面訊號並據以顯示一晝面,該液晶 顯示器包括複數條掃目苗線,該驅動方法包括: 將該些掃瞄線區分為一正常組與一重置組; 依序致能該些掃目苗線之一,若被致能之該掃瞒線屬於 該正常組,則依該晝面訊號驅動被致能之該掃瞄線上之像 素,若被致能之該掃瞄線屬於該重置組,則以一低電壓驅 動被致能之該掃瞄線上之像素。 7. 如申請專利範圍第6項所述之驅動方法,其中該低 電壓係依據該晝面訊號而產生。
TW0944F(奇美).ptd 第13頁
TW093102247A 2004-01-30 2004-01-30 Driving method of multi-domain vertical alignment LCD TWI282082B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
TW093102247A TWI282082B (en) 2004-01-30 2004-01-30 Driving method of multi-domain vertical alignment LCD
KR1020040113944A KR100994550B1 (ko) 2004-01-30 2004-12-28 다중-구역 수직 배열 액정 디스플레이 구동 방법
US11/032,426 US7298353B2 (en) 2004-01-30 2005-01-10 Driving method of a multi-domain vertical alignment liquid crystal display
JP2005005574A JP2005215673A (ja) 2004-01-30 2005-01-12 マルチドメイン垂直配向型液晶表示装置の駆動方法

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Application Number Priority Date Filing Date Title
TW093102247A TWI282082B (en) 2004-01-30 2004-01-30 Driving method of multi-domain vertical alignment LCD

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TW200525482A TW200525482A (en) 2005-08-01
TWI282082B true TWI282082B (en) 2007-06-01

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JP (1) JP2005215673A (zh)
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US8390545B2 (en) * 2005-10-25 2013-03-05 Samsung Lcd Netherlands R&D Center B.V. Reset circuit for display devices
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