WO2008149582A1 - バックライトランプ点灯制御装置およびそれを備えた表示装置 - Google Patents

バックライトランプ点灯制御装置およびそれを備えた表示装置 Download PDF

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Publication number
WO2008149582A1
WO2008149582A1 PCT/JP2008/052436 JP2008052436W WO2008149582A1 WO 2008149582 A1 WO2008149582 A1 WO 2008149582A1 JP 2008052436 W JP2008052436 W JP 2008052436W WO 2008149582 A1 WO2008149582 A1 WO 2008149582A1
Authority
WO
WIPO (PCT)
Prior art keywords
brightness
pwm signal
backlight lamp
lighting controller
lamp lighting
Prior art date
Application number
PCT/JP2008/052436
Other languages
English (en)
French (fr)
Inventor
Mitsuru Hosoki
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Priority to US12/451,224 priority Critical patent/US8305335B2/en
Priority to CN200880016216A priority patent/CN101682976A/zh
Publication of WO2008149582A1 publication Critical patent/WO2008149582A1/ja

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit 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
    • H05B41/282—Circuit 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
    • H05B41/2821—Circuit 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
    • H05B41/2824—Circuit 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

　外部から入力されたデューティ比に基づいて生成されたＰＷＭ信号を、蛍光ランプ（２５）を点灯駆動するＰＷＭ制御によるインバータ部（２４）に出力するＰＷＭ信号発生部（２２）を備えるバックライトランプ点灯制御装置であって、蛍光ランプ（２５）を流れる電流を検出する管電流検出部（２６）を備え、ＰＷＭ信号発生部（２２）は、液晶パネル（１）に表示される輝度が該液晶表示パネル（１）の全面において略均一となるように、管電流検出部（２６）により検出された電流を外部から入力されたデューティ比に応じて変更し、変更した電流を利用して上記ＰＷＭ信号を生成する。これにより、バックライト用のランプにおける高圧側の輝度と低圧側の輝度との差を小さくすることによって、表示画面全体で略均一な輝度の表示を得ることができるバックライトランプ点灯制御装置を提供する。
PCT/JP2008/052436 2007-06-05 2008-02-14 バックライトランプ点灯制御装置およびそれを備えた表示装置 WO2008149582A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/451,224 US8305335B2 (en) 2007-06-05 2008-02-14 Backlight lamp lighting control device and display device including same
CN200880016216A CN101682976A (zh) 2007-06-05 2008-02-14 背光源灯点亮控制装置及具有该装置的显示装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007-149594 2007-06-05
JP2007149594 2007-06-05

Publications (1)

Publication Number Publication Date
WO2008149582A1 true WO2008149582A1 (ja) 2008-12-11

Family

ID=40093411

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/052436 WO2008149582A1 (ja) 2007-06-05 2008-02-14 バックライトランプ点灯制御装置およびそれを備えた表示装置

Country Status (3)

Country Link
US (1) US8305335B2 (ja)
CN (1) CN101682976A (ja)
WO (1) WO2008149582A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5708605B2 (ja) * 2012-03-09 2015-04-30 株式会社デンソー Ｐｗｍデューティ変換装置
JP6575113B2 (ja) * 2015-04-02 2019-09-18 船井電機株式会社 表示装置
CN110660363A (zh) * 2018-06-29 2020-01-07 夏普株式会社 液晶显示装置及其控制方法
TWI731498B (zh) * 2019-12-05 2021-06-21 友達光電股份有限公司 顯示系統

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10112396A (ja) * 1996-10-08 1998-04-28 Taiyo Yuden Co Ltd 放電灯点灯装置
JP2000058289A (ja) * 1998-08-10 2000-02-25 Taiyo Yuden Co Ltd 放電灯の輝度調整方法及び放電灯点灯装置
JP2002158097A (ja) * 2000-11-16 2002-05-31 Tdk Corp 放電灯点灯装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3050203B2 (ja) * 1998-04-27 2000-06-12 株式会社村田製作所 圧電トランスインバータ
JP2002056996A (ja) 2000-08-11 2002-02-22 Nippon Avionics Co Ltd 液晶バックライト調光方式
KR100989159B1 (ko) * 2003-12-29 2010-10-20 엘지디스플레이 주식회사 액정표시장치와 그 제어방법
US7394209B2 (en) * 2004-02-11 2008-07-01 02 Micro International Limited Liquid crystal display system with lamp feedback
JP2006084710A (ja) * 2004-09-15 2006-03-30 Toshiba Matsushita Display Technology Co Ltd 表示制御回路、表示制御方法、および液晶表示装置
JP4760093B2 (ja) 2005-03-30 2011-08-31 船井電機株式会社 液晶テレビ用バックライト装置の他励型インバータ回路、及びバックライト装置の他励型インバータ回路
JP4797511B2 (ja) * 2005-08-23 2011-10-19 日本電気株式会社 冷陰極管点灯装置、管電流制御方法、及び集積回路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10112396A (ja) * 1996-10-08 1998-04-28 Taiyo Yuden Co Ltd 放電灯点灯装置
JP2000058289A (ja) * 1998-08-10 2000-02-25 Taiyo Yuden Co Ltd 放電灯の輝度調整方法及び放電灯点灯装置
JP2002158097A (ja) * 2000-11-16 2002-05-31 Tdk Corp 放電灯点灯装置

Also Published As

Publication number Publication date
US20100214207A1 (en) 2010-08-26
US8305335B2 (en) 2012-11-06
CN101682976A (zh) 2010-03-24

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