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TWI364746B - - Google Patents

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Publication number
TWI364746B
TWI364746B TW096125674A TW96125674A TWI364746B TW I364746 B TWI364746 B TW I364746B TW 096125674 A TW096125674 A TW 096125674A TW 96125674 A TW96125674 A TW 96125674A TW I364746 B TWI364746 B TW I364746B
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TW
Taiwan
Prior art keywords
backlight
display system
color
brightness
frame
Prior art date
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TW096125674A
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English (en)
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TW200903435A (en
Inventor
Wei Hsin Wei
Jing Meng Liu
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Richtek Technology Corp
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Publication date
Application filed by Richtek Technology Corp filed Critical Richtek Technology Corp
Priority to TW096125674A priority Critical patent/TW200903435A/zh
Priority to KR1020080065556A priority patent/KR100954038B1/ko
Priority to US12/216,720 priority patent/US20090015543A1/en
Publication of TW200903435A publication Critical patent/TW200903435A/zh
Application granted granted Critical
Publication of TWI364746B publication Critical patent/TWI364746B/zh

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • 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
    • G09G3/3406Control of illumination source
    • 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
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/0646Modulation of illumination source brightness and image signal correlated to each other
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00Aspects of display data processing
    • G09G2340/16Determination of a pixel data signal depending on the signal applied in the previous frame

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

Description

1364746 九、發明說明: 【發明所屬之技術領域】 本發明係有關一種顯示系統,特別是關於一種具有背 光調節的顯示系統及其調節方法。
V 【先前技術】 以電池為電源之可攜式電子裝置,例如行動電話、個 人數位助理(PDA)、數位相機及數位攝影機等,主要的功 I 率消耗來自顯示系統,而顯示系統中又以背光裝置的消耗 功率最大,為了減少顯示系統的消耗功率以延長電池壽 命,提出使背光變暗以減少背光裝置的消耗功率,以及增 加顯示面板的穿透率以維持相同的亮度的技術,此技術即 為所謂的背光調節(backlight scaling)技術。以穿透式薄膜 電晶體液晶顯示(TFT-LCD)系統為例,在TFT-LCD面板上 觀察到的亮度L與背光亮度(backlight luminance)b及 φ TFT-LCD面板的穿透率t(x)的關係為 L=t(x) . b 公式 1 其中’穿透率t(x)為像素值X的函數。背光裝置消耗的功 率與背光亮度b成強烈正相關,亦即背光亮度b越大所消 耗的功率就越多,相反地,TFT-LCD面板的消耗功率幾乎 疋固定的而與其穿透率t(x)無關,藉由背光調節降低背光 亮度b減少消耗功率,以及增加TFT-LCD面板的穿透率 1364746 b=|以避免下-訊框的像素資料經背光調節後超出〇〜255 的範圍造成影像失真。在此範例中,f光亮度由丨減少為 吾,故消耗功率減少為原來的1。 2 在實把例中,訊框的像素由紅色、綠色及藍色次像 素構成,顯示面板250包括TFT_LCD面板,背光裝置· 包括由白光光源及彩色濾光片組成的白背光裝置,其中白 光光源包括冷陰極螢光燈(CCFL)、白光發光二極體 (WLED)、白光有機發光二極體(w〇led)或由紅色、綠色 及藍色光源混合產生的白光,以及訊框的像素資料 X包括 ’時間控制器22()統計訊框的像素灰階值產生該像 值的直方圖’並根據該灰階值的直方圖產生白光背 = 次像素的亮度經由白光背光亮度
透率的乘積決定 T V V L〇 ’G -Lb- Λ· 公式3 产,t ^ 分別為紅色 '綠色及藍色次像素的亮 :次:素==別為顯Γ面板250對應紅色、綠色及藍 色領示在題_ :經由调整tR、tG&tB以產生不同的顏 m不面板25G上,例如當紅色、綠色及藍色的亮 度比時,顯示在顯示面板25〇上 的顏色為白色。 在另-實施例巾,f光裝置包括由色彩光源組成 的衫色背光裝置,例如背光I置·具有紅色光源、綠色 光源及藍色光源,以及訊框的像素資料X包括色彩值,例 如紅色、綠色及藍色色彩值’時間控制器22〇統計訊框的 像素色衫值產生該像素色彩值的直方圖,並根據該色彩值 的直方圖產生對應的色光背光亮度bR、bG& bB,次像素 的亮度經由色m亮度bR、bj bB及各色穿透率的乘 積決定,因此公式3可修正為
Lr bR 0 〇 tR 其中,bR、bG及bB分別為紅光背光亮度、綠光背光亮度 及藍光背光壳度。公式4可應用在空間(spatial)及時間 (temporal)一種合成顏色的方法中,例如經由將彩色濾光片 放置在一習知TFT-LCD顯示面板上而實現空間合成顏色 的方法,或者經由在非常短的時間週期中連續地產生紅 色、綠色及藍色使人類視覺無法察覺的時間上的差異而實 現時間合成顏色的方法,此時間合成顏色的方法稱為色彩 連續顯示(color sequential display),由於空間合成顏色的 方法係一個像素中紅色、綠色及藍色成分分別由紅色、綠 色及藍色次像素顯示,而時間合成顏色的方法係一個像素 中、、工色、綠色及藍色成分使用相同的像素結構,因此時間 1364746 合成顏色的方法可提升像素密度,而增加顯示面板解析度 或減少顯示面板的尺寸。 在不同的實施例中,彩色背光裝置包括色彩光源及色 彩轉換單元,該色彩光源包括藍色光源,例如藍色發光二 極體或藍色有機發光二極體,以及訊框的像素資料X包括 藍色色彩值,時間控制器220統計訊框的像素的藍色色彩 值產生藍色色彩值的直方圖,並根據該藍色色彩值的直方 圖產生藍色光背光亮度bB進行背光調節以產生藍色亮度 LB,經由色彩轉換單元根據藍色亮度LB產生對應的紅色 亮度Lr_及綠色亮度Lg。 【圖式簡單說明】 圖1係習知具有背光調節的顯示系統的示意圖;以及 圖2係本發明具有訊框位移背光調節的顯示系統的示 意圖。 【主要元件符號說明】 100 具有背光調節的顯示系統 110 輸入連接器 112 連接器 120 訊框緩衝器 130 時間控制器 140 直流/直流轉換器及伽瑪電壓產生器 150 背光驅動器 12 1364746 152 掃描驅動器積體電路 154 資料驅動器積體電路 160 顯示面板 170 背光裝置 172 背光 200 具有訊框位移背光調節的顯示系統 210 輸入連接器 212 連接器 220 時間控制器 230 直流/直流轉換器及伽瑪電壓產生器 240 背光驅動裝置 242 掃描驅動器積體電路 244 資料驅動器積體電路 250 顯示面板 260 背光裝置 262 背光 13

Claims (1)

1364746十、申請專利範圍:
m 101年3月26日修正替換頁 . 種具有訊框位移背光調卽的顯示系統,包括: 一時間控制器,統計一當前訊框的像素資料產生一背 光亮度,以及根據該背光亮度重新計算一下一訊框 的像素資料; 一顯示面板,根據該下一訊框重新計算後的像素資料 產生對應的穿透率;以及 -背光裝置’根據該背光亮度產生—背光提供給該顯 示面板以顯示該下一訊框的影像。 2.如凊求項1的顯示系統,其中該當前訊框及該下— 訊框為相鄰的二個訊框。 3·如請求項i的顯示系統’更包括―驅動裝置根據該 下一訊框重主新計算後的像素資料驅動該顯示面板。 4.如明求項3的顯示系統,其中該驅動裝置包括資料 驅動器積體電路及掃描驅動器積體電路。 5. 如請求項1的顯示系統, 據S亥月光7C度驅動該背光裝置。 6. 如請求項1的顯示系統, 值0 更包括一背光驅動裝置根 其中該像素資料包括灰階 7·如明求項1的顯示系統,其中該像素資料包括色彩 值0 8.如請求们的顯示系統 背光亮度。 其中該背光亮度包括白光 9.如明衣項1的顯示系統,其中該背光亮度包括色光 S 14 1364746 背光亮度。 . 睹带-如°月求項1的顯示系統’其中該顯示面板包括薄 膜電晶體液晶顯示面板。 A 求項1的顯示祕,其中該背光裝置包括彩 色老光裝置或白背光裝置。 12.如,月求項n的顯示系統,其中該彩色背光裝置包 括紅色光源、綠色光源及藍色光源。 括3.如吻求項11的顯示系統,其中該彩色背光裝置包 一色彩光源;以及 一色彩轉換單元。 14.如叫求項π的顯示系統,其中該色彩光源包括藍 色光源。 15·如請求項14的顯示系統,其中該藍色光源包括藍 色發光二極體或藍色有機發光二極體。 16.如請求項U的顯示系統,其中該白背光裝置包 括: 一白光光源;以及 一彩色濾光片。 17. 如請求項16的顯示系統,其中該白光光源包括以 下之一:冷陰極螢光燈、白光發光二極體、白光有機發光 二極體或由紅色、綠色及藍色光源混合產生的白光。 18. —種顯示系統的訊框位移背光調節方法,包括下 列步驟: 15 1364746 根據當前訊框的像素資料產生一背光亮度,· 根攄該背光亮度重新計算下—訊框的像素資料;以及 根據該下-訊框重新計算後的像素資料及該背光亮 度顯示該下一訊框的影像。 19.如請求項18的訊框位移背光調節方法,其令該產 生該背光亮度的步驟包括下列步驟·· 統計該當前訊框的像素的㈣值以產生該灰階值的 直方圖;以及 根據該灰階值的直方圖產生一白光背光亮度。 ▲ 20.如請求項18的訊框位移背光調節方法其中該產 生5亥背米焭度的步驟包括下列步驟: 統計該當前訊框的像素的色彩值產生該色彩值的直 方圖;以及 根據j色彩值的直方圖產生該色彩值顏色的色光背 光亮度。
TW096125674A 2007-07-13 2007-07-13 Frame-shifted backlight-scaled display system and frame-shifted backlight scaling method TW200903435A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
TW096125674A TW200903435A (en) 2007-07-13 2007-07-13 Frame-shifted backlight-scaled display system and frame-shifted backlight scaling method
KR1020080065556A KR100954038B1 (ko) 2007-07-13 2008-07-07 프레임 위치 이동 백라이트 조절 방법 및 디스플레이시스템
US12/216,720 US20090015543A1 (en) 2007-07-13 2008-07-10 Frame-shifted backlight-scaled display system and frame-shifted backlight scaling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW096125674A TW200903435A (en) 2007-07-13 2007-07-13 Frame-shifted backlight-scaled display system and frame-shifted backlight scaling method

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TW200903435A TW200903435A (en) 2009-01-16
TWI364746B true TWI364746B (zh) 2012-05-21

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TWI410915B (zh) * 2009-03-27 2013-10-01 Innolux Corp 背光調整系統及方法
TW201128618A (en) * 2010-02-03 2011-08-16 Novatek Microelectronics Corp Apparatus of back-light control and control method thereof
TW201141242A (en) * 2010-05-04 2011-11-16 Benq Corp Method for controlling the display circuit and backlight of a display device
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CN110189693B (zh) * 2019-06-11 2021-01-26 京东方科技集团股份有限公司 显示驱动方法、显示驱动器和显示装置
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KR20240138694A (ko) 2023-03-13 2024-09-20 주식회사 원동 살균제 살포 기능을 갖는 송풍장치

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JP2006098803A (ja) * 2004-09-29 2006-04-13 Toshiba Corp 動画処理方法、動画処理装置および動画処理プログラム
KR101076445B1 (ko) * 2005-09-21 2011-10-25 엘지디스플레이 주식회사 디스플레이 장치 및 그의 구동 방법
KR101227655B1 (ko) * 2006-06-27 2013-01-30 삼성디스플레이 주식회사 액정표시장치 및 이의 구동방법
JP4643545B2 (ja) * 2006-11-20 2011-03-02 株式会社日立製作所 液晶表示装置

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KR20090007219A (ko) 2009-01-16
KR100954038B1 (ko) 2010-04-20
TW200903435A (en) 2009-01-16
US20090015543A1 (en) 2009-01-15

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