JPH0433018U - - Google Patents
Info
- Publication number
- JPH0433018U JPH0433018U JP1990074658U JP7465890U JPH0433018U JP H0433018 U JPH0433018 U JP H0433018U JP 1990074658 U JP1990074658 U JP 1990074658U JP 7465890 U JP7465890 U JP 7465890U JP H0433018 U JPH0433018 U JP H0433018U
- Authority
- JP
- Japan
- Prior art keywords
- external light
- electroluminescent lamp
- voltage
- converter
- output
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 239000004973 liquid crystal related substance Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図及び第２図は本考案の一実施例を説明す
るためのもので、第１図は電界発光灯の点灯装置
の回路ブロツク図、第２図は第１図の点灯装置の
具体的回路構成図である。
１……電界発光灯、２……ＤＣ−ＤＣコンバー
タ、３……ＤＣ−ＡＣインバータ、４……外部光
検出回路、ＶＩＮ……電源電圧、ＶＯＵＴ……出
力電圧（直流電圧）、ＶＥＬ……交流電圧、Ｌ…
…外部光。
Figures 1 and 2 are for explaining one embodiment of the present invention. Figure 1 is a circuit block diagram of a lighting device for an electroluminescent lamp, and Figure 2 is a concrete example of the lighting device shown in Figure 1. FIG. 3 is a circuit configuration diagram. 1...Electroluminescent lamp, 2...DC-DC converter, 3...DC-AC inverter, 4...External light detection circuit, VIN...Power supply voltage, VOUT...Output voltage (DC voltage), VEL... AC voltage, L...
...External light.
Claims (1)
電界発光灯の点灯装置てあつて、 外部光検出回路が設けられ、電源電圧を電界発
光灯の点灯電圧まで昇圧して上記外部光検出回路
により検出された外部光の強弱に応じた可変の出
力電圧を生成するＤＣ−ＤＣコンバータと、ＤＣ
−ＤＣコンバータから出力された直流電圧を交流
電圧に変換して電界発光灯に印加するＤＣ−ＡＣ
インバータとからなり、 強い外部光により外部光検出回路からの検知出
力が大きい場合、ＤＣ−ＤＣコンバータの出力電
圧を上昇されて電界発光灯の輝度を上げ、弱い外
部光により外部光検出回路からの検知出力が小さ
い場合、ＤＣ−ＤＣコンバータの出力電圧を低下
させて電界発光灯の輝度を下げるようにしたこと
を特徴とする電界発光灯の点灯装置。[Scope of Claim for Utility Model Registration] A lighting device for an electroluminescent lamp used as a backlight for a liquid crystal display is provided with an external light detection circuit, and boosts the power supply voltage to the lighting voltage of the electroluminescent lamp to detect the external light. A DC-DC converter that generates a variable output voltage according to the intensity of external light detected by the detection circuit, and a DC
-DC-AC converts the DC voltage output from the DC converter into AC voltage and applies it to the electroluminescent lamp.
When the detection output from the external light detection circuit is large due to strong external light, the output voltage of the DC-DC converter is increased to increase the brightness of the electroluminescent lamp, and the output voltage from the external light detection circuit is increased due to weak external light. 1. A lighting device for an electroluminescent lamp, characterized in that when the detection output is small, the output voltage of the DC-DC converter is lowered to lower the brightness of the electroluminescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990074658U JPH0433018U (en) | 1990-07-12 | 1990-07-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990074658U JPH0433018U (en) | 1990-07-12 | 1990-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0433018U true JPH0433018U (en) | 1992-03-18 |
Family
ID=31614542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990074658U Pending JPH0433018U (en) | 1990-07-12 | 1990-07-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0433018U (en) |
-
1990
- 1990-07-12 JP JP1990074658U patent/JPH0433018U/ja active Pending
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