JPS6430977U

JPS6430977U -

Info

Publication number: JPS6430977U
Application number: JP12623787U
Authority: JP
Priority date: 1987-08-18
Filing date: 1987-08-18
Publication date: 1989-02-27

Description

[Brief explanation of the drawing]

第１図はこの考案に係る液晶テレビジヨン受像
機の電力節減装置の一実施例を示すブロツク図、
第２図は第１図の実施例を具体化した回路の一例
を示すブロツク図、第３図はこの考案の他の実施
例を示す回路図、第４図は第３図の実施例を具体
化した回路の一例を示す回路図、第５図及び第６
図は液晶テレビジヨン受像機にける発光体駆動方
式の一例を説明するための説明図である。１…電源アダプタージヤツク、２…電池、４…
電源スイツチ、５…蛍光管駆動回路、５ｂ…調光
入力端、６…蛍光管、１０…検出回路、１１…調
光スイツチ、１２…電圧源／映像回路。 FIG. 1 is a block diagram showing an embodiment of a power saving device for a liquid crystal television receiver according to this invention;
Fig. 2 is a block diagram showing an example of a circuit embodying the embodiment of Fig. 1, Fig. 3 is a circuit diagram showing another embodiment of this invention, and Fig. 4 is an embodiment of the embodiment of Fig. 3. Figures 5 and 6 are circuit diagrams showing examples of converted circuits.
The figure is an explanatory diagram for explaining an example of a light emitter driving method in a liquid crystal television receiver. 1...Power adapter jack, 2...Battery, 4...
Power switch, 5... Fluorescent tube drive circuit, 5b... Dimming input terminal, 6... Fluorescent tube, 10... Detection circuit, 11... Dimmer switch, 12... Voltage source/video circuit.

Claims

[Scope of Claim for Utility Model Registration] (1) A light emitter drive circuit having a dimming input terminal capable of switching a light emitter that illuminates a liquid crystal panel from the back side between high brightness and low brightness driving, and a pair of battery connection terminals; and a pair of connection terminals for a power supply adapter, and a power supply switching means for selectively outputting either the battery voltage or the power adapter voltage from these terminal pairs as a power supply voltage; If the power source is from the battery, input a signal to the dimming input terminal to instruct low-intensity light emission, and if it is from the power adapter, input a signal to instruct high-intensity light emission. A power saving device for a liquid crystal television receiver, characterized by comprising: a power source determination means; (2) The power source in use determination means is characterized in that the determination is made by detecting a current flowing through a reverse voltage blocking diode connected between corresponding terminals of a pair of battery connection terminals and a pair of power adapter connection terminals. A power saving device for a liquid crystal television receiver as claimed in claim 1. (3) The liquid crystal television receiver set forth in claim 1 of the utility model registration claim, wherein the power source determining means determines based on the difference in voltage values supplied from the battery and the power adapter. Power saving device.