JPH01149617U - - Google Patents
Info
- Publication number
- JPH01149617U JPH01149617U JP4565788U JP4565788U JPH01149617U JP H01149617 U JPH01149617 U JP H01149617U JP 4565788 U JP4565788 U JP 4565788U JP 4565788 U JP4565788 U JP 4565788U JP H01149617 U JPH01149617 U JP H01149617U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- lighting
- inverter circuit
- width modulation
- liquid crystal
- 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
- 239000004973 liquid crystal related substance Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Liquid Crystal Display Device Control (AREA)
Description
第１図はこの考案の一実施例を示す回路図、第
２図ａ〜ｃ及び、第３図ａ〜ｃはこの考案の一実
施例の動作説明のための波形図、第４図ａ，ｂは
調光用クランプ回路の動作説明のための波形図、
第５図はバツクライトの説明図、第６図はＬＣＤ
付ＶＴＲの一例を示す正面図である。
図中、１０は蛍光灯点灯回路、１１は蛍光灯バ
ツクライト、１２はＤＣ／ＡＣインバータ回路、
２０はパルス幅変調回路、２１は矩形波発振器、
２２は積分回路、２３はコンパレータ、２５は時
定数回路を示す。
FIG. 1 is a circuit diagram showing an embodiment of this invention, FIGS. 2 a to c and 3 a to c are waveform diagrams for explaining the operation of an embodiment of this invention, and FIGS. b is a waveform diagram for explaining the operation of the dimming clamp circuit;
Figure 5 is an explanatory diagram of the backlight, Figure 6 is the LCD
It is a front view showing an example of a VTR. In the figure, 10 is a fluorescent lamp lighting circuit, 11 is a fluorescent lamp backlight, 12 is a DC/AC inverter circuit,
20 is a pulse width modulation circuit, 21 is a square wave oscillator,
22 is an integrating circuit, 23 is a comparator, and 25 is a time constant circuit.
Claims (1)
晶表示部を備えている電子機器の点灯電源回路と
して、ＤＣ／ＡＣインバータ回路と、前記ＤＣ／
ＡＣインバータ回路のスイツチを制御するパルス
幅変調回路とを設け、前記パルス幅変調回路は、
点灯信号によつてパルスデユーテイが徐々に増加
する信号を出力するように構成したことを特徴と
する液晶表示電子機器のバツクライト点灯回路。 A lighting power supply circuit for an electronic device equipped with a liquid crystal display section that uses a cold cathode fluorescent tube as a backlight includes a DC/AC inverter circuit and the DC/AC inverter circuit.
a pulse width modulation circuit for controlling a switch of an AC inverter circuit, the pulse width modulation circuit comprising:
A backlight lighting circuit for a liquid crystal display electronic device, characterized in that the circuit is configured to output a signal whose pulse duty gradually increases depending on the lighting signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4565788U JPH01149617U (en) | 1988-04-06 | 1988-04-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4565788U JPH01149617U (en) | 1988-04-06 | 1988-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01149617U true JPH01149617U (en) | 1989-10-17 |
Family
ID=31271958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4565788U Pending JPH01149617U (en) | 1988-04-06 | 1988-04-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01149617U (en) |
-
1988
- 1988-04-06 JP JP4565788U patent/JPH01149617U/ja active Pending
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