JPH0320581U - - Google Patents
Info
- Publication number
- JPH0320581U JPH0320581U JP7875989U JP7875989U JPH0320581U JP H0320581 U JPH0320581 U JP H0320581U JP 7875989 U JP7875989 U JP 7875989U JP 7875989 U JP7875989 U JP 7875989U JP H0320581 U JPH0320581 U JP H0320581U
- Authority
- JP
- Japan
- Prior art keywords
- backlight
- switching signal
- high voltage
- generating circuit
- polarity switching
- 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 description 2
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Liquid Crystal Display Device Control (AREA)
- Transforming Electric Information Into Light Information (AREA)
Description
第１図は本考案に係るバツクライト光量コント
ロール装置が組込まれた液晶テレビジヨン受像機
を示す回路図、第２図は実施例装置の動作を説明
するためのタイミングチヤート、第３図は本考案
の他の実施例を示す回路図、第４図は従来のバツ
クライト光量コントロール装置を示す回路図、第
５図は従来例の動作を説明するための波形図であ
る。
１……高圧発生回路、３，１６……電源端子、
５……バツクライト、１３……Ｈ極性切換信号発
生回路、１７……光量切換スイツチ、Ｒ１〜Ｒ５
……抵抗、Ｑ１〜Ｑ４……トランジスタ。
FIG. 1 is a circuit diagram showing a liquid crystal television receiver incorporating a backlight light amount control device according to the present invention, FIG. 2 is a timing chart for explaining the operation of the embodiment device, and FIG. FIG. 4 is a circuit diagram showing another embodiment, FIG. 4 is a circuit diagram showing a conventional backlight light amount control device, and FIG. 5 is a waveform diagram for explaining the operation of the conventional example. 1... High voltage generation circuit, 3, 16... Power terminal,
5...Backlight, 13...H polarity switching signal generation circuit, 17...Light amount switching switch, R1 to R5
...Resistor, Q1-Q4...Transistor.
Claims (1)
と、 このバツクライトにランプ点灯パルスを与えて
点灯させる高圧発生回路と、 １水平期間毎に極性が切替わるＨ極性切換信号
を発生するＨ極性切換信号発生回路と、 電池駆動時には前記Ｈ極性切換信号に基づいた
周期で前記高圧発生回路に断続的に電源電圧を供
給する電源電圧断続供給手段とを具備したことを
特徴とするバツクライト光量コントロール装置。[Scope of Claim for Utility Model Registration] A backlight for irradiating light onto a liquid crystal panel, a high voltage generation circuit that applies a lamp lighting pulse to the backlight to turn it on, and an H polarity switching signal whose polarity is switched every horizontal period. The high voltage generating circuit is characterized by comprising: a generating circuit for generating an H polarity switching signal; and a power supply voltage intermittent supply means for supplying a power supply voltage intermittently to the high voltage generating circuit at a cycle based on the H polarity switching signal when driven by a battery. Backlight light amount control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7875989U JPH0320581U (en) | 1989-07-05 | 1989-07-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7875989U JPH0320581U (en) | 1989-07-05 | 1989-07-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0320581U true JPH0320581U (en) | 1991-02-28 |
Family
ID=31622314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7875989U Pending JPH0320581U (en) | 1989-07-05 | 1989-07-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0320581U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9305500B2 (en) | 2006-07-07 | 2016-04-05 | Seiko Epson Corporation | Projector |
-
1989
- 1989-07-05 JP JP7875989U patent/JPH0320581U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9305500B2 (en) | 2006-07-07 | 2016-04-05 | Seiko Epson Corporation | Projector |
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