TWI259031B - Lamp frequency control system for display - Google Patents

Lamp frequency control system for display Download PDF

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Publication number
TWI259031B
TWI259031B TW093109787A TW93109787A TWI259031B TW I259031 B TWI259031 B TW I259031B TW 093109787 A TW093109787 A TW 093109787A TW 93109787 A TW93109787 A TW 93109787A TW I259031 B TWI259031 B TW I259031B
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Taiwan
Prior art keywords
frequency
frequency control
lamp
control system
mode
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TW093109787A
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English (en)
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TW200534748A (en
Inventor
Shin-Ming Chen
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Chi Mei Optoelectronics Corp
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Priority to TW093109787A priority Critical patent/TWI259031B/zh
Priority to US11/101,169 priority patent/US7456816B2/en
Priority to JP2005112770A priority patent/JP2005338786A/ja
Publication of TW200534748A publication Critical patent/TW200534748A/zh
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Publication of TWI259031B publication Critical patent/TWI259031B/zh

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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/26Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2824Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using control circuits for the switching element
    • 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3614Control of polarity reversal in general
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14Circuit arrangements
    • H05B41/36Controlling
    • 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
    • G09G2310/08Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

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

Description

1259031 玖、發明說明·· 【技術領域】 本發明係關於一種頻率控制系統及方法,詳言之,係關 .於一種顯示器燈管頻率控制系統及方法。 【先前技術】 參考圖1所示,目前顯示器(例如:液晶顯示器)之燈管11 係由轉換器12將直流轉換為交流,以供給燈管所需電源。 並且顯不為之顯不面板15係由一驅動裝置16所驅動顯 示,該驅動裝置16之驅動模式目前有:點反轉模式(― mversion)及行反轉模式(c〇lumn inversi〇n)等多種驅動模 式。每一種驅動模式具有不同之驅動方式及掃瞄頻率。 —目刖已知忒轉換器之工作頻率與掃瞄頻率相互影響下, 會產生水波紋干擾(water fl〇w n〇ise)現象。習知改善水波紋 現象之解決方法有三種。第—種方法為以銦錫氧化層(ιτ〇) 加以屏蔽電磁干擾。第二種方法係採用與水平掃瞎頻率同 /之轉換态工作頻率。第三種方法為以相鄰兩支燈管極性 相反,以抵鎖電場干擾強度進而減輕水波紋干擾現象。 然而’第一種方法之成本較高,並且ΙΤ〇層會因品質之門 題曰久而黃化,產生色澤偏差之問題。第二種方法必須精 準地鎖;t水平㈣解,若稍有偏差則水波紋干 立即出現。第二插方彳你叮、士 Λ 豕將 弟一種方式僅可減輕水波紋干擾現象,盔 底解決水波紋干擾現象。 …、去锨 另外目別之驅動裝置16具有至少二驅動模式(例如 反轉模式及行反轉模式)可切換控制,在驅動模式切換控制
O:\90\90034 DOC 1259031 Γ,將不可能精準鎖定某一太单产^ ^ # τ , 一 κ +知目田頻率以配合轉換琴之 工作頻率。因此,在且古 為之 干。。 一 ^ 一驅動模式之驅動裝置之顯 不杰’無法m方法解決水波紋干擾^ :::有必要提供—種創新且具進步性的顯示器燈管頻 '、控制系統及方法,以解決上述問題。 【發明内容】 本發明之目的在於提供一 包括一驅動控制裝置及_^=^ 系統, 制裝置呈有一骚動m “ ^ 控制裝置。該驅動控 1 一男 勤核式選擇哭, 握1由 至乂 一驅動模式選 擇其中之一,依據該選擇 谭《驅勤杈式,輸出相對應之至少 一頻率控制訊號。該燈管頻率 ^ 手徑制裝置依據該頻率控制訊 5虎,取得相對應之至少一燈管頻率。 :發明之顯示器燈管頻率控制系統係依據不同之驅動模 式取得相對應之燈管頻率, 、 喟敕…人 羊Φ於该燈官頻率可以相對應地 周正以配a不同之驅動模式。因卜μ „ 二 因此,可以調整該燈管頻 革在,·,、水波紋干擾之頻率區段’故利用本發明 管頻率控㈣統可以解決水波紋干擾現象。…“ 【實施方式】 請參閱圖2Α及2Β’其顯示水波紋干擾之頻譜分析。 圖2八為在點反轉模式之水波紋干擾之頻譜分析,; 椒至後舰之頻率間無水波紋干擾現象。另參考=在 係在订反轉杈式之水波紋 ^ ^ ._ 肩σ曰刀析,其顯不在29.5Κ 至36.5ΚΗΖ之頻率間無水波紋干擾現象。 參考圖3 ’本發明之顯示器燈管頻率控制系統30包括:一
O:\90\90034 DOC 1259031 驅動控制裝置31及-燈管頻率控制裝置32。該驅動控制裝 置31具有-驅動模式選擇器川,用以由至少二驅動模式選 擇其中之―,依據該選擇之驅動模式’輸出相對應之至^ 一頻率控制訊號3 1 2。 該驅動控制裝置31之該等驅動模式可為點反轉模式、行 反轉模式或其他驅動模式,本實施例中係以點反轉模式及 行反轉模式為說明。該驅動模式選擇器川選擇點反轉模式 或行反轉模式。當該驅動模式選擇器3U選擇點反轉模式為 驅動模式後,該頻率控制訊號3丨2設定為高電位(H);告該 驅動模式選擇H3⑽擇行反轉模式為㈣模錢,該頻率 控制汛號3 1 2設定為低電位(L)。 並且,當該驅動模式選擇器311選擇點反轉模式為驅動模 式後,該顯示器之顯示面板33係由該驅動控制裝置31之點 ㈣模式驅動器313所驅動顯示;當該驅動模式選擇器扣 選擇行反轉模式為驅動模式後,該顯示器之顯示面板η係 由該驅動控制裝置31之行反轉模式驅動器3M所驅動顯示。 該燈管頻率控制裝置32接收該該頻率控制訊號312並依 據該頻率控制訊號312,取得相對應之至少_燈管頻率。本 實施例中’《管頻率㈣裝置32制—對應表321,以便 於取得相對應之燈管頻率。因此,當該對應表32丨接收到高 电位之及頻率控制訊號3 12時,表示該驅動模式選擇器州 選擇點反轉模式為驅動模式,設定燈管頻率為咐則^依 據圖2A所示,該頻率範圍内無水波紋干擾)之間之其中之一 頻率。當該對應表321接收到低電位之該頻率控制訊號312
O:\90\90034.DOC 1259031 時,表示該驅動模式選擇器3U選擇行反轉模式為驅動模 式’設定燈管頻率為33±3KHz(依據圖2;8所示,該頻率範圍 内無水波紋干擾)之間之其中之一頻率。 由該對應表321所取得之該燈管頻率輸出至該該燈管頻 率控制I置32之-轉換器322。該轉換器322依據該燈管頻 率為工作頻率,進行直流至交流之轉換,以提供燈管34所 需電源。 由於該轉換器322之工作頻率可以相對應地調整,以配合 不同之驅動杈式。因此,不論該驅動控制裝置3 1係選擇點 反轉模式或是行反轉模式,該轉換器322之工作頻率可以被 切換至不會有水波紋干擾之頻率,在該工作頻率之操作 下,使顯示器不會有水波紋干擾之現象。 為使燈管34之電流穩定,本發明之顯示器燈管頻率控制 系統30另包括一回授電路35,用以回授補償燈管電流,使 該燈管34雖在不同之工作頻率切換下,亦能穩定該燈管34 之電流。 惟上述實施例僅為說明本發明之原理及其功效,而非限 制本發明。因此,習於此技術之人士可在不違背本發明之 精神對上述貫加例進行修改及變化。本發明之權利範圍應 如後述之申請專利範圍所列。 【圖式簡單說明】 圖1為習用顯示器燈管頻率控制及驅動控制顯示器面板 之不意圖, 圖2 A為在點反轉模式之水波紋干擾頻谱分析圖;
O:\90\90034 DOC 1259031 圖2B為在點反轉模式之水波紋干擾頻譜分析圖;及 圖3為本發明顯示器燈管頻率控制系統之示意圖。 【圖式元件符號說明】 11 燈管 12 轉換器 15 顯示面板 16 驅動裝置 30 本發明之顯示器燈管頻率控制系統 31 驅動控制裝置 311 驅動模式選擇器 312 頻率控制訊號 313 點反轉模式驅動器 314 行反轉模式驅動器 32 燈管頻率控制裝置 321 對應表 322 轉換器 3 3 顯示面板 34 燈管 35 回授電路
0:'9〇\90034 DOC

Claims (1)

1259031 拾、申請專利範圍: -種顯示器燈管頻率控制系統,包括: 少:;: =制裝置,具有-驅動模式選擇器,用以由至 -艇動模式選擇其令之一,依 輪出相對應之至少-頻率控制訊號;擇之.㈣拉式, 對頻率控制裝置,依據該頻率控制訊號,取得相 丁應之至少一燈管頻率。 2. 二申:專利範圍第1項之顯示器燈管頻率控制系統,另包 率:直器:該轉換器用以依據該燈管頻率為工作頻 進仃直流至父流之轉換。 3. =請專利範圍第丨項之顯示器燈管頻率控制系統,苴中 q燈官頻率控制裝置具有一對應 號,取得相對應之至少一燈管頻率。H 員率控制訊 4·二申請專利範圍第1項之顯示器燈管頻率控制系統,且中 5玄等驅動模式為點反轉模式及行反轉模式。 5. 如申請專利範圍第4項之顯示器燈管頻率控制系統,豆中 遠點反轉模式之相對應頻率控制訊號為高電位;該;亍反 轉模式之相對應頻率控制訊號為低電位。 6. 如申請專利範圍第4項之顯示器燈管頻率控制系統,其中 該點反轉模式之相對應燈管頻率為44±3ΚΗζ;該行反轉模 式之相對應燈管頻率為33±3ΚΗΖ。 7. 如申請專利範圍第丨項之顯示器燈管頻率控制系統 =:!率控制裝置另包括一回授電路’用以回授補償 k g电,以穩定燈管電流。 O:\90\90034 DOC 1259031 8. 一種顯示器燈管頻率控制方法,包括以下步驟: (a) 由至少二驅動模式選擇其中之一; (b) 依據。亥遥擇之驅動模式,輸出相對應之至少一頻率控 制訊號; $ 〇矿據^ ν員率控制訊號,取得相對應之至少一燈管頻率。 月專利乾圍第8項之顯示器燈管頻率控制方法,另包 轉換步驟’依據該燈管頻 10,如申喑糞免卜 料進仃直流至父流之轉換。 申明專利翻第8項之顯示器燈f頻率控制方法’另包 流广步驟’用以回授補償燈管電流,以穩定燈管電 O:\90\90034.DOC
TW093109787A 2004-04-08 2004-04-08 Lamp frequency control system for display TWI259031B (en)

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Application Number Priority Date Filing Date Title
TW093109787A TWI259031B (en) 2004-04-08 2004-04-08 Lamp frequency control system for display
US11/101,169 US7456816B2 (en) 2004-04-08 2005-04-07 Lamp frequency control system for display and method for controlling lamp frequency
JP2005112770A JP2005338786A (ja) 2004-04-08 2005-04-08 ディスプレイ用照明光源周波数制御システム

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TWI259031B true TWI259031B (en) 2006-07-21

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080061686A (ko) * 2006-12-28 2008-07-03 삼성전자주식회사 백라이트 어셈블리와 이의 구동 방법 그리고 이를 구비하는액정 표시 장치
KR101415064B1 (ko) * 2007-12-11 2014-07-04 엘지디스플레이 주식회사 액정표시장치의 구동 제어 장치 및 방법
KR101501481B1 (ko) 2008-12-24 2015-03-30 삼성디스플레이 주식회사 디스플레이장치, 백라이트 유닛 및 상기 디스플레이 장치의구동 방법
US8830155B2 (en) * 2009-10-30 2014-09-09 Au Optronics Corporation Method and source driver for driving liquid crystal display
KR101842064B1 (ko) * 2011-05-18 2018-03-27 삼성디스플레이 주식회사 액정 표시 장치의 구동 장치 및 방법
CN102646400B (zh) * 2011-08-15 2013-12-18 北京京东方光电科技有限公司 一种显示器驱动电路、驱动方法及液晶显示装置
US10607522B1 (en) * 2015-12-28 2020-03-31 Amazon Technologies, Inc. Adaptive drive scheme for electrowetting displays
KR102511559B1 (ko) * 2018-01-26 2023-03-16 엘지디스플레이 주식회사 액정표시장치 및 그 컨트롤러, 그 구동방법

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2644010B2 (ja) * 1988-11-21 1997-08-25 キヤノン株式会社 表示制御装置
JP2664526B2 (ja) * 1990-07-10 1997-10-15 三洋電機株式会社 自動販売機
JPH05113766A (ja) * 1991-10-21 1993-05-07 Sharp Corp バツクライト付液晶表示装置
JPH09218670A (ja) * 1996-02-14 1997-08-19 Fujitsu Ltd 表示モード判別機能付き表示装置および表示モード判別方法
JP3829507B2 (ja) * 1997-12-12 2006-10-04 松下電工株式会社 電子バラストおよびhidランプ制御回路
JP4472126B2 (ja) * 2000-06-26 2010-06-02 Necディスプレイソリューションズ株式会社 バックライト駆動回路
JP2002365611A (ja) * 2001-06-11 2002-12-18 Fujitsu Ten Ltd 液晶表示装置
JP2003075803A (ja) * 2001-08-31 2003-03-12 Matsushita Electric Ind Co Ltd Lcdバックライト電源装置
KR20030084020A (ko) * 2002-04-24 2003-11-01 삼성전자주식회사 액정 표시 장치 및 그 구동 방법
TWI232070B (en) * 2003-02-27 2005-05-01 Chi Mei Optoelectronics Corp Device and method to dynamically adjust the burst mode switching frequency for LCD
JP2006039337A (ja) * 2004-07-29 2006-02-09 Nec Electronics Corp 液晶表示装置及びその駆動回路

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US20050258780A1 (en) 2005-11-24

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