JP4350035B2 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
- Publication number
- JP4350035B2 JP4350035B2 JP2004522794A JP2004522794A JP4350035B2 JP 4350035 B2 JP4350035 B2 JP 4350035B2 JP 2004522794 A JP2004522794 A JP 2004522794A JP 2004522794 A JP2004522794 A JP 2004522794A JP 4350035 B2 JP4350035 B2 JP 4350035B2
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- JP
- Japan
- Prior art keywords
- liquid crystal
- signal
- control signal
- luminance
- luminance control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- 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
-
- 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
- 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
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- 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
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
-
- 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
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
-
- 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
- G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the 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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the 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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
-
- 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
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Description
液晶表示装置のパネルは、複数の画素がマトリックス状に形成された基板とそれに対向する基板とからなる。これら二つの基板の間には、異方性誘電性を有する液晶物質が注入される。前記二つの基板の間には、電界が印加され、この電界の強度を調節することによって基板を透過する光の量が制御されて所望の画像が表示される。
本発明は、前記のような従来の技術的問題点を解決するためのものであって、動画の視認性を改善するために、画像データの情報を受けて信号処理を行った後、該処理された画像データに基づいて、バックライトの輝度を処理するための適応型バックライト制御(adaptive backlight control:ABC)方式を提供することを目的とする。
特に、本発明は、パルス幅変調方式の駆動及びアナログ方式の駆動を、輝度制御信号の生成に用いる液晶表示装置を提供することをその目的とする。
前記本発明の目的、技術的構成及びその効果に関して、以下の実施例の説明を通じてより明確にする。
以下、本発明の実施例による液晶表示装置及びその駆動方法について図面を参照して詳細に説明する。
図1に示すように、本発明による液晶表示装置は、液晶パネルアセンブリ10、ゲート駆動部20、データ駆動部30、ランプ40、インバータ50、電圧発生部60及び信号制御部70を含む。
図3に示すように、本発明による液晶表示装置のインバータ50は、輝度制御部51、トランジスタ駆動部52、トランジスタQ1、コイルL及びランプ駆動部53で構成される。輝度制御部51は、第1輝度制御信号を生成する第1ブロック511、第2輝度制御信号を生成する第2ブロック512、及び第1ブロック511と第2ブロック512の信号を合成する合成部513で構成される。
合成部513からの信号は、トランジスタ駆動部52に提供されてトランジスタQ1の動作を制御し、トランジスタQ1は、コイルLを通じてランプ駆動部53に提供される電流の大きさを制御する。即ち、トランジスタQ1がオフ状態の間は、ランプ駆動部53へ電流が流れず、トランジスタQ1がオン状態の間は、合成部513から出力される信号の大きさに従って、ランプ駆動部53に流れる電流の大きさが制御される。
以上、本発明の好ましい実施例について詳細に説明したが、本発明の権利範囲はこれに限定されず、特許請求範囲で定義している本発明の基本概念を利用した当業者の様々な変形及び改良形態も本発明の権利範囲に属するものである。
Claims (5)
- 複数のゲートラインと、前記ゲートラインに交差する複数のデータラインと、前記各ゲートラインとデータラインの交差点に形成された画素とからなる液晶パネルアセンブリ、外部のグラフィックソースから提供される画像データと同期信号とを受信して、前記液晶パネルアセンブリの駆動に必要な制御信号の生成及び前記画像データのフォーマット変換を行う信号制御部、前記液晶パネルアセンブリの駆動に必要な階調電圧及びゲート電圧を生成する電圧発生部、前記ゲート電圧に基づいて前記液晶パネルアセンブリのゲートラインを1水平走査期間単位で順次に走査するゲート駆動部、前記液晶パネルアセンブリ上のデータライン毎に前記信号制御部からの画像データに対応する階調電圧を選択するデータ駆動部、前記画像データの輝度分布に依存するアナログ値を有する第1輝度制御信号を生成し、フレーム周波数の整数倍で決定される周波数を有し、所定のパルスデューティ比を有する第2輝度制御信号を生成し、前記第2輝度制御信号の高さを前記第1輝度制御信号の高さに応じて変化させることによって前記第1及び第2輝度制御信号を合成し、前記合成された信号に従ってランプ駆動信号を生成するインバータ、及び前記インバータから出力される駆動信号に従ってオン及びオフの状態並びに発光強度が制御されるランプを含むことを特徴とする液晶表示装置。
- 前記インバータは、前記画像データの輝度分布に依存するアナログ値を有する前記第1輝度制御信号を生成する第1ブロック、前記同期信号の周波数に依存して決定される周波数を有し、所定のパルスデューティ比を有する前記第2輝度制御信号を生成する第2ブロック、及び前記第2ブロックで生成された前記第2輝度制御信号の高さを前記第1ブロックで生成された前記第1輝度制御信号の高さに応じて変化させることによって前記第1及び第2輝度制御信号を合成する合成部を含み、前記液晶表示装置は、さらに前記合成部から出力される信号に従って電流を生成するトランジスタ回路、及び前記トランジスタ回路から供給される電流に基づいて高電圧のランプ駆動信号を生成するランプ駆動部を含むことを特徴とする請求項1に記載の液晶表示装置。
- 前記第1ブロックは、前記画像データを輝度分布に基づいてカウントし、前記カウント結果から予め設定された輝度範囲に属する画像データの数を求め、この結果を基準テーブルに予め保存したデータと比較して、前記第1輝度制御信号を生成することを特徴とする請求項2に記載の液晶表示装置。
- 前記第1ブロックは、1水平走査期間単位で画像データの輝度分布をカウント及び計算することを特徴とする請求項3に記載の液晶表示装置。
- 前記第1ブロックは、アナログ調光制御を利用し、前記第2ブロックは、パルス幅変調による調光制御を利用することを特徴とする請求項2に記載の液晶表示装置。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020020042653A KR100825107B1 (ko) | 2002-07-19 | 2002-07-19 | 액정 표시 장치 |
PCT/KR2002/001767 WO2004010208A1 (en) | 2002-07-19 | 2002-09-18 | A liquid crystal display |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005534055A JP2005534055A (ja) | 2005-11-10 |
JP4350035B2 true JP4350035B2 (ja) | 2009-10-21 |
Family
ID=36583213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004522794A Expired - Fee Related JP4350035B2 (ja) | 2002-07-19 | 2002-09-18 | 液晶表示装置 |
Country Status (6)
Country | Link |
---|---|
US (2) | US7324077B2 (ja) |
JP (1) | JP4350035B2 (ja) |
KR (1) | KR100825107B1 (ja) |
CN (1) | CN100357792C (ja) |
AU (1) | AU2002328457A1 (ja) |
WO (1) | WO2004010208A1 (ja) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100925291B1 (ko) * | 2002-12-31 | 2009-11-04 | 하이디스 테크놀로지 주식회사 | 액정 표시 장치 |
JP2004248055A (ja) * | 2003-02-14 | 2004-09-02 | Pentax Corp | 被写体像を表示可能なデジタルカメラ及び撮影用表示装置 |
JP3859154B2 (ja) * | 2003-05-28 | 2006-12-20 | 船井電機株式会社 | 液晶テレビ受像機および液晶表示装置 |
KR100947776B1 (ko) * | 2003-06-17 | 2010-03-15 | 엘지디스플레이 주식회사 | 액정표시모듈의 램프 구동장치 및 구동방법 |
JP3968587B2 (ja) * | 2004-03-30 | 2007-08-29 | 船井電機株式会社 | 液晶テレビジョン、バックライト制御装置およびバックライト制御方法 |
KR101067940B1 (ko) * | 2004-06-30 | 2011-09-26 | 엘지디스플레이 주식회사 | 액정표시장치의 구동부 |
KR101101790B1 (ko) * | 2004-12-28 | 2012-01-05 | 엘지디스플레이 주식회사 | 백라이트 구동 방법 |
CN100411008C (zh) * | 2005-04-21 | 2008-08-13 | 凌阳科技股份有限公司 | 控制显示器亮度的方法及其装置 |
WO2007007472A1 (ja) * | 2005-07-07 | 2007-01-18 | Sharp Kabushiki Kaisha | 表示装置 |
JP4908813B2 (ja) * | 2005-09-30 | 2012-04-04 | エプソンイメージングデバイス株式会社 | 電気光学装置、電気光学装置の駆動方法、電子機器 |
JP4207986B2 (ja) * | 2006-06-28 | 2009-01-14 | 双葉電子工業株式会社 | 蛍光表示装置とその駆動方法 |
JP4405481B2 (ja) * | 2006-06-30 | 2010-01-27 | 株式会社東芝 | 液晶表示装置 |
KR101282252B1 (ko) * | 2006-08-04 | 2013-07-10 | 삼성전자주식회사 | 영상처리장치 및 영상처리방법 |
KR100836424B1 (ko) * | 2007-02-05 | 2008-06-09 | 삼성에스디아이 주식회사 | 유기 전계 발광표시장치 및 그 구동방법 |
KR100836438B1 (ko) | 2007-02-05 | 2008-06-09 | 삼성에스디아이 주식회사 | 유기 전계 발광표시장치 및 그 구동방법 |
CN101669409B (zh) * | 2007-05-16 | 2013-06-19 | 夏普株式会社 | 显示装置用照明装置、显示装置 |
DE202007011817U1 (de) | 2007-08-24 | 2009-01-08 | Vogl, Erich R. | Gipskartonplatte mit Vliesbeschichtung mit absorbierenden Zusätzen |
KR101565937B1 (ko) * | 2008-07-28 | 2015-11-06 | 삼성디스플레이 주식회사 | 백라이트 어셈블리, 이를 포함하는 표시 장치 및 그의 구동방법 |
TWI384452B (zh) * | 2008-08-13 | 2013-02-01 | Sitronix Technology Corp | Control circuit and control method of color sequential liquid crystal display device |
GB2465194A (en) * | 2008-11-10 | 2010-05-12 | Iti Scotland Ltd | Randomly or pseudo-randomly modulated switching waveform for LED backlight |
KR101341021B1 (ko) * | 2009-12-11 | 2013-12-13 | 엘지디스플레이 주식회사 | 광원 구동 장치 및 그 구동 방법 |
KR20120020843A (ko) * | 2010-08-31 | 2012-03-08 | 삼성전자주식회사 | 디스플레이장치 및 이에 구비된 백라이트를 구동하는 구동회로장치 |
KR200485988Y1 (ko) | 2016-04-18 | 2018-03-20 | 우성화학(주) | 김 양식용 부구 |
CN109256098B (zh) * | 2018-11-22 | 2021-01-26 | 高创(苏州)电子有限公司 | 驱动方法、驱动装置和显示装置 |
CN114648967B (zh) * | 2022-03-16 | 2023-07-25 | Tcl华星光电技术有限公司 | 液晶显示面板及显示装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3027298B2 (ja) * | 1994-05-31 | 2000-03-27 | シャープ株式会社 | バックライト制御機能付き液晶表示装置 |
JPH09218392A (ja) | 1996-02-13 | 1997-08-19 | Fujitsu Ltd | 液晶表示装置の駆動回路 |
US5838294A (en) * | 1996-12-15 | 1998-11-17 | Honeywell Inc. | Very low duty cycle pulse width modulator |
JP4049287B2 (ja) | 1999-05-21 | 2008-02-20 | Necディスプレイソリューションズ株式会社 | 表示装置 |
JP3971892B2 (ja) | 2000-09-08 | 2007-09-05 | 株式会社日立製作所 | 液晶表示装置 |
KR100548434B1 (ko) * | 2000-10-10 | 2006-02-02 | 엘지전자 주식회사 | 휴대형 컴퓨터의 절전 방법 |
KR100415510B1 (ko) * | 2001-03-15 | 2004-01-16 | 삼성전자주식회사 | 적응형 휘도 증대 기능을 갖는 액정 표시 장치 및 이의구동 방법 |
US6762742B2 (en) * | 2000-12-29 | 2004-07-13 | Samsung Electronics Co., Ltd. | Apparatus and method for automatic brightness control for use in liquid crystal display device |
KR100759362B1 (ko) * | 2001-01-18 | 2007-09-19 | 삼성전자주식회사 | 백라이트 어셈블리 및 이를 갖는 액정 표시 장치 |
US6690121B1 (en) * | 2002-11-20 | 2004-02-10 | Visteon Global Technologies, Inc. | High precision luminance control for PWM-driven lamp |
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2002
- 2002-07-19 KR KR1020020042653A patent/KR100825107B1/ko not_active IP Right Cessation
- 2002-09-18 JP JP2004522794A patent/JP4350035B2/ja not_active Expired - Fee Related
- 2002-09-18 AU AU2002328457A patent/AU2002328457A1/en not_active Abandoned
- 2002-09-18 WO PCT/KR2002/001767 patent/WO2004010208A1/en active Application Filing
- 2002-09-18 CN CNB028294955A patent/CN100357792C/zh not_active Expired - Fee Related
- 2002-09-18 US US10/521,731 patent/US7324077B2/en not_active Expired - Fee Related
-
2008
- 2008-01-28 US US12/011,779 patent/US8169390B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
KR100825107B1 (ko) | 2008-04-25 |
WO2004010208A1 (en) | 2004-01-29 |
JP2005534055A (ja) | 2005-11-10 |
CN100357792C (zh) | 2007-12-26 |
KR20040008915A (ko) | 2004-01-31 |
US20060125767A1 (en) | 2006-06-15 |
US7324077B2 (en) | 2008-01-29 |
US8169390B2 (en) | 2012-05-01 |
US20080158267A1 (en) | 2008-07-03 |
CN1650219A (zh) | 2005-08-03 |
AU2002328457A1 (en) | 2004-02-09 |
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