WO2008105193A1 - ランプ異常検出装置およびそれを備えたインバータ、バックライト装置、表示装置 - Google Patents

ランプ異常検出装置およびそれを備えたインバータ、バックライト装置、表示装置 Download PDF

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Publication number
WO2008105193A1
WO2008105193A1 PCT/JP2008/050682 JP2008050682W WO2008105193A1 WO 2008105193 A1 WO2008105193 A1 WO 2008105193A1 JP 2008050682 W JP2008050682 W JP 2008050682W WO 2008105193 A1 WO2008105193 A1 WO 2008105193A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric current
difference
circuit
lamp
outputs
Prior art date
Application number
PCT/JP2008/050682
Other languages
English (en)
French (fr)
Inventor
Hideki Koh
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 US12/448,008 priority Critical patent/US8004215B2/en
Priority to JP2009501149A priority patent/JP4837088B2/ja
Priority to EP08703532A priority patent/EP2099262A1/en
Publication of WO2008105193A1 publication Critical patent/WO2008105193A1/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
    • H05B41/26—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
    • H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2855—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
    • 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
    • G02F1/133612—Electrical details

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Liquid Crystal (AREA)

Abstract

　本発明は、ランプの異常を検出するランプ異常検出装置に関する。 　最大最小抽出回路（１５１）は、各ランプ駆動回路（１４０）から供給される電流の中から電流値が最大のものを最大電流（Ｉｍａｘ）として出力し、電流値が最小のものを最小電流（Ｉｍｉｎ）として出力する。減算回路（１５２）は、最大電流（Ｉｍａｘ）と最小電流（Ｉｍｉｎ）との差分を算出し、増幅後の差分を差分電圧（ΔＶ）として出力する。比較回路（１５３）は、差分電圧（ΔＶ）と所定の閾値電圧とを比較し、比較結果を制御信号（Ｓ）として出力する。制御回路（１３０）は、閾値電圧よりも差分電圧（ΔＶ）の方が大きいことを制御信号（Ｓ）が示していれば、ランプ駆動回路の動作を停止させる。                                                                                 
PCT/JP2008/050682 2007-02-26 2008-01-21 ランプ異常検出装置およびそれを備えたインバータ、バックライト装置、表示装置 WO2008105193A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US12/448,008 US8004215B2 (en) 2007-02-26 2008-01-21 Lamp abnormality detecting device and inverter, backlight device, and display device which are equipped with the same
JP2009501149A JP4837088B2 (ja) 2007-02-26 2008-01-21 ランプ異常検出装置およびそれを備えたインバータ、バックライト装置、表示装置
EP08703532A EP2099262A1 (en) 2007-02-26 2008-01-21 Lamp malfunction detecting device and inverter equipped with the same, back lighting device and display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007045675 2007-02-26
JP2007-045675 2007-02-26

Publications (1)

Publication Number Publication Date
WO2008105193A1 true WO2008105193A1 (ja) 2008-09-04

Family

ID=39721034

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/050682 WO2008105193A1 (ja) 2007-02-26 2008-01-21 ランプ異常検出装置およびそれを備えたインバータ、バックライト装置、表示装置

Country Status (5)

Country Link
US (1) US8004215B2 (ja)
EP (1) EP2099262A1 (ja)
JP (1) JP4837088B2 (ja)
CN (1) CN101606439A (ja)
WO (1) WO2008105193A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101017204B1 (ko) 2007-09-14 2011-02-25 산켄덴키 가부시키가이샤 방전등 점등장치
CN113823229A (zh) * 2021-09-03 2021-12-21 惠州视维新技术有限公司 驱动电路及其故障检测方法、背光模组和显示装置

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2919458B1 (fr) * 2007-07-25 2009-10-16 Sidel Participations Procede de detection de l'etat d'une lampe de chauffage de corps d'ebauches en matiere thermoplastique et installation de chauffage agencee pour sa mise en oeuvre
CN102622968A (zh) * 2011-01-26 2012-08-01 国琏电子（上海）有限公司 多灯管驱动系统
US8878461B2 (en) 2011-06-30 2014-11-04 Applied Materials, Inc. Lamp failure detector
CN103327675A (zh) * 2012-03-23 2013-09-25 国钰电子(北海)有限公司 发光二极管驱动系统及方法
CN103379692A (zh) * 2012-04-16 2013-10-30 国钰电子(北海)有限公司 发光二极管驱动系统及方法
US9970994B2 (en) * 2012-12-27 2018-05-15 Sharp Kabushiki Kaisha Electronic device
CN103187036B (zh) * 2013-03-29 2015-06-03 深圳市华星光电技术有限公司 一种led背光驱动电路及其驱动方法和液晶显示模组
US9196202B2 (en) 2013-03-29 2015-11-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit
CN109946859B (zh) * 2019-04-09 2022-02-01 深圳市华星光电半导体显示技术有限公司 背光模组的检测方法和装置
CN111324163B (zh) * 2020-02-27 2022-09-30 合肥京东方光电科技有限公司 一种电压调节方法、电压调节电路及显示装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6450395A (en) * 1987-08-21 1989-02-27 Mitsubishi Electric Corp Inverter circuit
JPH01167986A (ja) * 1987-12-23 1989-07-03 Matsushita Electric Works Ltd ランプ異常検出回路
JP2002231034A (ja) 2001-01-18 2002-08-16 Samsung Electronics Co Ltd バックライトアセンブリ及びこれを有する液晶表示装置
JP2006066220A (ja) * 2004-08-26 2006-03-09 Mitsumi Electric Co Ltd 冷陰極管駆動回路

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100471161B1 (ko) * 2003-05-28 2005-03-14 삼성전기주식회사 자기 보호기능을 갖는 ｌｃｄ 패널용 백라이트 인버터
JP4548043B2 (ja) * 2004-08-23 2010-09-22 ミツミ電機株式会社 最大又は最小値出力回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6450395A (en) * 1987-08-21 1989-02-27 Mitsubishi Electric Corp Inverter circuit
JPH01167986A (ja) * 1987-12-23 1989-07-03 Matsushita Electric Works Ltd ランプ異常検出回路
JP2002231034A (ja) 2001-01-18 2002-08-16 Samsung Electronics Co Ltd バックライトアセンブリ及びこれを有する液晶表示装置
JP2006066220A (ja) * 2004-08-26 2006-03-09 Mitsumi Electric Co Ltd 冷陰極管駆動回路

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101017204B1 (ko) 2007-09-14 2011-02-25 산켄덴키 가부시키가이샤 방전등 점등장치
CN113823229A (zh) * 2021-09-03 2021-12-21 惠州视维新技术有限公司 驱动电路及其故障检测方法、背光模组和显示装置

Also Published As

Publication number Publication date
US8004215B2 (en) 2011-08-23
CN101606439A (zh) 2009-12-16
US20100033097A1 (en) 2010-02-11
JPWO2008105193A1 (ja) 2010-06-03
EP2099262A1 (en) 2009-09-09
JP4837088B2 (ja) 2011-12-14

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