JP4942087B2 - Led駆動制御装置 - Google Patents
Led駆動制御装置 Download PDFInfo
- Publication number
- JP4942087B2 JP4942087B2 JP2006253600A JP2006253600A JP4942087B2 JP 4942087 B2 JP4942087 B2 JP 4942087B2 JP 2006253600 A JP2006253600 A JP 2006253600A JP 2006253600 A JP2006253600 A JP 2006253600A JP 4942087 B2 JP4942087 B2 JP 4942087B2
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- Prior art keywords
- led
- pulse
- control unit
- constant current
- comparator
- 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.)
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
2 駆動制御部
3 電源
4 PWM制御部
5 LED定電流制御部
Claims (4)
- 複数のLEDを並列に接続したLED発光部と、
各LEDに対して明るさ指示信号に応じた幅のパルスを出力するPWM制御部と、
前記並列に接続したLED毎に、流れる電流を定電流に制御する定電流制御部と、
前記並列に接続したLED毎のアース端子に接続したバイアス抵抗による、前記定電流制御部で定電流に制御している電圧と、基準電圧とを順に比較して、比較結果によるパルスを前記PWM制御部に順に出力するコンパレータとを備え、
前記PWM制御部では、前記明るさ指示信号に応じた幅のパルスと前記コンパレータの出力パルスのいずれかがパルスを出力しているときに駆動パルスを出力することを特徴とするLED駆動制御装置。 - 前記PWM制御部と前記定電流制御部とは予め製造された回路素子に組み込まれたものであり、
前記コンパレータは前記回路素子に接続し、その出力を前記回路素子の前記PWM制御部に出力することを特徴とする請求項1記載のLED駆動制御装置。 - 前記定電流制御部を流れる電流に対応する電圧を検出し、基準電圧と比較する第2のコンパレータを備え、
前記PWM制御部では、前記第2のコンパレータの出力によるLED全体を流れる電流に応じてパルス幅の調整を行うことを特徴とする請求項1記載のLED駆動制御装置。 - 前記LEDは白色LED、RGB独立LED、紫外LEDのいずれかであり、液晶の光源として用いることを特徴とする請求項1記載のLED駆動制御装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006253600A JP4942087B2 (ja) | 2006-09-19 | 2006-09-19 | Led駆動制御装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006253600A JP4942087B2 (ja) | 2006-09-19 | 2006-09-19 | Led駆動制御装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008077892A JP2008077892A (ja) | 2008-04-03 |
JP4942087B2 true JP4942087B2 (ja) | 2012-05-30 |
Family
ID=39349749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2006253600A Expired - Fee Related JP4942087B2 (ja) | 2006-09-19 | 2006-09-19 | Led駆動制御装置 |
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JP (1) | JP4942087B2 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014094316A1 (zh) * | 2012-12-20 | 2014-06-26 | 深圳市华星光电技术有限公司 | 一种led背光驱动电路和液晶显示装置 |
US8803440B2 (en) | 2012-12-20 | 2014-08-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and LCD device |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5100719B2 (ja) * | 2009-08-07 | 2012-12-19 | シャープ株式会社 | 照明装置 |
KR101072057B1 (ko) * | 2009-08-18 | 2011-10-11 | 엘지이노텍 주식회사 | Led 구동 회로 |
US8294375B2 (en) * | 2009-10-08 | 2012-10-23 | Intersil Americas Inc | Adaptive PWM controller for multi-phase LED driver |
KR101033972B1 (ko) | 2009-11-09 | 2011-05-11 | 엘지이노텍 주식회사 | 발광 다이오드용 전원 공급 장치 |
JP2011145928A (ja) * | 2010-01-15 | 2011-07-28 | Sharp Corp | 電源制御システム |
TWI424782B (zh) * | 2010-11-12 | 2014-01-21 | Au Optronics Corp | 光源系統與發光二極體驅動方法 |
JP5616768B2 (ja) | 2010-12-08 | 2014-10-29 | ローム株式会社 | 発光素子の駆動回路、それを用いた発光装置および電子機器 |
KR101940780B1 (ko) | 2011-09-16 | 2019-01-22 | 서울반도체 주식회사 | 반도체 발광 소자를 적용한 조명 장치 |
KR101272033B1 (ko) * | 2011-10-27 | 2013-06-07 | 주식회사 실리콘웍스 | Led구동장치 |
KR101206299B1 (ko) | 2011-11-11 | 2012-11-29 | 강원대학교산학협력단 | Dsp를 이용한 led 구동 장치 |
CN116312347B (zh) * | 2023-03-15 | 2024-06-18 | 深圳市美矽微半导体股份有限公司 | 一种实现led显示高刷新率的方法、电路及显示装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4236894B2 (ja) * | 2002-10-08 | 2009-03-11 | 株式会社小糸製作所 | 点灯回路 |
JP2006216304A (ja) * | 2005-02-02 | 2006-08-17 | Denso Corp | 駆動回路 |
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2006
- 2006-09-19 JP JP2006253600A patent/JP4942087B2/ja not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014094316A1 (zh) * | 2012-12-20 | 2014-06-26 | 深圳市华星光电技术有限公司 | 一种led背光驱动电路和液晶显示装置 |
US8803440B2 (en) | 2012-12-20 | 2014-08-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and LCD device |
Also Published As
Publication number | Publication date |
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JP2008077892A (ja) | 2008-04-03 |
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