JP2003203792A5 - - Google Patents
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- Publication number
- JP2003203792A5 JP2003203792A5 JP2002000430A JP2002000430A JP2003203792A5 JP 2003203792 A5 JP2003203792 A5 JP 2003203792A5 JP 2002000430 A JP2002000430 A JP 2002000430A JP 2002000430 A JP2002000430 A JP 2002000430A JP 2003203792 A5 JP2003203792 A5 JP 2003203792A5
- Authority
- JP
- Japan
- Prior art keywords
- lamp
- frequency
- current
- steady
- driving device
- 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.)
- Pending
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Claims (6)
前記ランプに交流電流を供給するランプ駆動部と、
前記ランプが点灯した直後の点灯開始時には、前記交流電流であるランプ電流を定常電流より大きい電流に設定するとともに、前記交流電流の周波数であるランプ駆動周波数を定常周波数より低い周波数に設定し、その後、前記ランプ電流を前記定常電流にするとともに、前記ランプ駆動周波数を前記定常周波数にするランプ駆動制御部と、
を備えることを特徴とするランプ駆動装置。An igniter that applies a lighting pulse to the lamp;
A lamp driver for supplying an alternating current to the lamp,
The lighting start immediately after the lamp is lit, and sets the lamp current is the alternating current to the current larger than the steady state current, set the lamp drive frequency is the frequency of the alternating current to a frequency lower than the stationary frequency, then , while the lamp current to the steady-state current, and a lamp drive control unit for the lamp drive frequency to the stationary frequency,
A lamp driving device comprising:
前記ランプ駆動制御部として、前記ランプの電極間の電圧を検出する電圧検出回路と、前記ランプ駆動周波数を設定する発振回路と、前記電圧検出回路により検出された前記電極間の電圧を閾値と比較することによって、前記発振回路の発振周波数を前記ランプ駆動周波数として、前記定常周波数より低い周波数から前記定常周波数に変更する制御回路とを有することを特徴とするランプ駆動装置。The lamp driving device according to claim 1, wherein
As the lamp drive control unit, a voltage detection circuit for detecting a voltage between electrodes of the lamp, an oscillation circuit for setting the lamp drive frequency, and a voltage between the electrodes detected by the voltage detection circuit are compared with a threshold value. And a control circuit that changes the oscillation frequency of the oscillation circuit from the frequency lower than the steady frequency to the steady frequency as the lamp drive frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002000430A JP2003203792A (en) | 2002-01-07 | 2002-01-07 | Lamp driving device and projection type display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002000430A JP2003203792A (en) | 2002-01-07 | 2002-01-07 | Lamp driving device and projection type display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003203792A JP2003203792A (en) | 2003-07-18 |
| JP2003203792A5 true JP2003203792A5 (en) | 2005-06-16 |
Family
ID=27640819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002000430A Pending JP2003203792A (en) | 2002-01-07 | 2002-01-07 | Lamp driving device and projection type display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003203792A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005173037A (en) * | 2003-12-09 | 2005-06-30 | Fujitsu Display Technologies Corp | Liquid crystal display device and its manufacturing method |
| KR101017780B1 (en) * | 2004-04-06 | 2011-02-28 | 엘지전자 주식회사 | Method and apparatus for controlling of a project type an image display device |
| EP1772043A1 (en) * | 2004-07-21 | 2007-04-11 | Koninklijke Philips Electronics N.V. | A control unit for a lamp driver providing smooth transition between operation modes |
| JP4873371B2 (en) * | 2007-04-24 | 2012-02-08 | 岩崎電気株式会社 | High pressure discharge lamp lighting device, projector and lighting method of high pressure discharge lamp |
-
2002
- 2002-01-07 JP JP2002000430A patent/JP2003203792A/en active Pending
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