TWI299486B - Driving system for a liquid crystal display - Google Patents

Driving system for a liquid crystal display Download PDF

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Publication number
TWI299486B
TWI299486B TW093130915A TW93130915A TWI299486B TW I299486 B TWI299486 B TW I299486B TW 093130915 A TW093130915 A TW 093130915A TW 93130915 A TW93130915 A TW 93130915A TW I299486 B TWI299486 B TW I299486B
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Taiwan
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circuit
digital
gamma
voltage
image
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TW093130915A
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English (en)
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TW200521940A (en
Inventor
Eui Yeol Oh
Ki Duk Kim
Chul Sang Jang
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Lg Display Co Ltd
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Classifications

    • 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
    • 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
    • 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
    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • 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
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Description

!299486 九、發明說明： 【發明所屬之技術領域】 之、夜^月，關於一種液晶顯示器’特別是一種可程式化控制 ^液S日頒不益之驅動電路及其驅動方法。 【先前技術】 =，示器因為具有輕、薄的優點，且 ===，在資訊處理裝置中，例如電腦 對比值等等)有待；^切加，其純品_如，明亮度、 1 之 11 Λ pa/ 、”、…"°拉！ 1包含有：數位視訊卡10、抻告，丨哭 視訊=動器13及液晶面板20 :射1 11，用以接收數位像ί號巧位影像訊號。控制器 器12及資料驅動器& 以控制閘驅動 控制之掃瞒錄以導通或截止由控制器η所 應於來自控制器U的數位1 動益13 ’用以提供對 晶面板㈣像素區：⑽:並傳送至液 亦包令5電路4()及__^ 5t曰頌不複组1 卡上0的數位影像訊號至控制器η，二Ji專=位視訊 其:=制器η傳送掃描訊號至貧，動器13， 賁1㈣上的薄膜電晶體。資蚪;々通或關閉 U傳送的數位影像訊號為類像訊^動^、:轉換控制器 液晶面板20的複數個資 1 = 5傳适類比訊號至 ，線…軸像訊號轉換為類比 1299486 時’伽瑪電路15提供伽瑪電壓以控制液晶的透明 i數由伽瑪電路15中的電阻器電路分壓成 像電壓值。每—個音調電齡對應每一數位影 至，自的資料線，以作為類比影像訊號，同時， / ^棱供知描訊號至形成在液晶面板20上複數個閘線 二，:傳3至各自的像素區域(pixel area)。 動電’係為先前技術之液曰3曰顯示器之類比驅 包人右：办 电路方塊不意圖，而類比驅動電路單元31， 3 P馬龟路Μ、命令電壓電路40及變頻哭押制哭 控制器5〇的t4H 命令電壓電路4G及變頻器 伽瑪電路15，具有複數電阻(Rl、R2 Rnl,廿、泰1 ϊ=ΐ分3ft果，而每一電阻(Ri，·......心： (幻厂1〜㈣連接至緩衝器35的輸出端，藉以對^前的 分壓，以輸出分別的伽瑪電壓。 了<刚的电壓再次 印々電壓電路40，具有複數個電阻(R1〇1 & =衝，並彼此串聯以產生分壓效果」傳送電 衝态45中的操作放大器(〇pAmp)，而 ^值至緩 的命令電壓至液晶面板。變頻器控^器5() ^輪ί :电士、，亚f過電阻器(圖中未示)轉換電壓，以基二二:員 唬’猎以驅動液晶顯示器的變頻器。 一二飞 因為每-驅動f路需要分別製造，驢 * 龐域製造成本昇高。另外，輸出電=! 包阻态(multiple resistors)分壓出的類比 =^夕闾 化的方式產生，因此，由於多_雷阳哭由—义不疋由可裎式 献夕“阻裔中母一電_電阻值皆 1299486 =定，所以多個電阻器的輸出電壓即無法改變，故處 =^*騰眶)無法控制類比驅動電路3卜因此:如何 =供-餘晶顯示器之驅動電路，成為研究人員待解問題之 【發明内容】 鑒於以上的問題，本發明的主要 示器之驅動電路及其驅動方法，萚以^ y f、種液曰曰# 電路體積的目的。 料達到降低製造成本與縮小 因此，為達上述目白勺，本發明所揭露之液晶顯示 動 包$有·類比驅動電路單元、數位類比轉換器及數位介 驅動電路單元。數位介面單以操作類比 *」二ί人Γ曰曰片中。而類比驅動電路單元，更包含 有·伽瑪笔路、命令電路及變頻器控制器。 電路口 ^ 本發明提出—種液晶顯示器之驅動 電子式抹㈣程式唯:二體：== Programmable Read On,yMem〇ry , EEpR0M)a± " 6 :=^因此，_鶴電路m過 說明^本毛月的^欲與貫作，兹配合圖示作最佳實施例詳細 【實施方式】
^i =第3圖」’係為本發明之液晶顯示表攀蚵# ^伞元⑽之電路錢圓，而；以J 動電路單元100具有盥「貧〗间，一 a θ …H則3比驅 結構。特爾，卿^ 1299486 i电路107或受頻态控制器ι〇9 〇 數位分析苐1 _影像資料， _可程式唯讀記愫二〇:;”處理識確認電子式 制訊號’·當電子式抹除可程式唯讀t己:二增二 度的控 以;，控制訊號至數= ί=====訊號時，則由數位2 _單元ω3。接下來’數娜 電Μ，以提供給變頻器控制器1G9。變頻 J據，，比電壓’控制用以驅動液晶面板2“:光的變;9 二t Ba面板㈣細亮度會增加，並且顯示比第1』 衫像貝料更明亮的第2幢影像資料。 、弟幀 定敕處理器2〇0透過分析影像資料的結果，決 情比值。然後，數位訊號處理器2GG或電子 ΐ了 t唯讀記㈣_提供控制訊號，以改變透過i :iouin送至數位類比轉換單元⑽的伽瑪ϊ ί= ”，其中二 圖所示)分壓取得，但藉由數位訊號;ίί: 腿，藉以使棘架構;為^^端，或亦可省略緩街器 f〇l^ 105 ： 4^.] 孔5虎處理益200用以分析影像資料，並決定進行調

Claims (1)

1299486 申請專利範圍： 種液晶顯示器之驅動電路，係用以顯示一影像資料，包含 十 i. 有 拼後之ΐίίϊί理11，用以分析該影像·並決定調整分 析後ϋ衫像貧料之至少—影像品f; 除可程式唯讀記憶體’與該數位處理器連 預先程式化之數位控鎮號，其中該數 位&制，就用以调整該影像資料之該影像品質； 匕ff單元，用以接收該電子式抹除可程式唯 二類控制訊號’並轉換該數位控制訊號為 ㈣比$驅^^路，單元’用以接收該數位類比轉換單元之 命^壓該f比電壓至―伽瑪(gamma)電路、至 、弘1包路及一變頻器控制器； 其中’該伽瑪電路，用以提供 器’且該命令電壓電路，用以提供_4ί忿=液晶顯示 -變頻器。 如肋產生—控制訊號，以驅動 2. =請專利範圍第！項所述之驅動電路， 路早元更提供該類比電壓至該伽 ς:5亥痛比驅動電 該變頻控制器。 Ί μ中令電壓電路及 3. =^專利範圍第2項所述之驅動電路， 该^令電路及該轉換控制器皆設置於一單^ 2伽瑪電路、 ’睛專利範圍第3項所述之驅動電路，其曰：1 ;益、該電子式抹除可程式唯讀記情體、μ數位訊號處 _及該數位介面單元皆設置於一單晶:中广數位類比轉換器 X ί利範圍第1項所述之驅動電路，其中告〜 賴理器更產生該數位控制訊號，該數位訊 夕—该影像品 12
TW093130915A 2003-12-29 2004-10-12 Driving system for a liquid crystal display TWI299486B (en)

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KR1020030099347A KR100767583B1 (ko) 2003-12-29 2003-12-29 액정표시장치 구동회로

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TWI299486B true TWI299486B (en) 2008-08-01

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US (1) US20050140628A1 (zh)
JP (1) JP2005196160A (zh)
KR (1) KR100767583B1 (zh)
CN (1) CN1637830A (zh)
DE (1) DE102004050392B4 (zh)
FR (1) FR2864680B1 (zh)
GB (1) GB2409760B (zh)
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TWI417857B (zh) * 2009-09-23 2013-12-01 Novatek Microelectronics Corp 液晶顯示器的驅動電路

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FR2864680A1 (fr) 2005-07-01
GB0422621D0 (en) 2004-11-10
JP2005196160A (ja) 2005-07-21
DE102004050392B4 (de) 2008-08-07
KR20050068185A (ko) 2005-07-05
GB2409760B (en) 2006-04-19
FR2864680B1 (fr) 2009-11-13
CN1637830A (zh) 2005-07-13
KR100767583B1 (ko) 2007-10-17
US20050140628A1 (en) 2005-06-30
DE102004050392A1 (de) 2005-07-21
TW200521940A (en) 2005-07-01
GB2409760A (en) 2005-07-06

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