JPH03104998U

JPH03104998U -

Info

Publication number: JPH03104998U
Application number: JP1412190U
Authority: JP
Priority date: 1990-02-15
Filing date: 1990-02-15
Publication date: 1991-10-30

Description

[Brief explanation of drawings]

第１図は本考案の基本構成を示す回路図、第２
図は同上を大型デイスプレイ装置に用いる場合の
具体回路図、第３図は同上の動作説明図、第４図
は従来例を示す回路図、第５図および第６図は同
上の動作説明図、第７図および第８図は従来の高
圧スイツチ回路の具体例を示す回路図である。１０……表示素子、１１……フイラメント、１
２……陽極、２２……第１のタイマ回路、２３…
…第２のタイマ回路、２４……高圧スイツチ回路
、２５……フオトカプラ、Ｅ_１……主電源、Ｅ_２……予熱電源、Ｅ_３……高圧電源、Ｒ_５……抵抗
、Ｓ_２……スイツチ素子。 Figure 1 is a circuit diagram showing the basic configuration of the present invention, Figure 2 is a circuit diagram showing the basic configuration of the present invention.
The figure is a specific circuit diagram when the same as above is used in a large display device, FIG. 3 is an explanatory diagram of the operation of the same, FIG. 4 is a circuit diagram showing a conventional example, FIGS. 5 and 6 are explanatory diagrams of the same as the above, FIGS. 7 and 8 are circuit diagrams showing specific examples of conventional high voltage switch circuits. 10... Display element, 11... Filament, 1
2... Anode, 22... First timer circuit, 23...
...Second timer circuit, 24...High voltage switch circuit, 25...Photocoupler, _E1 ...Main power supply, _E2 ...preheating power supply, _E3 ...high voltage power supply, _R5 ...resistor, _S2 ...switch element.

Claims

[Scope of utility model registration request]

The display element is made up of a fluorescent lamp with a filament and an anode facing each other and is lit by a DC power supply, and a main discharge is applied to the display element so that the display element lights up in the main discharge state in synchronization with a scanning signal that is generated at a constant cycle. A main power supply that applies voltage, a preheating power supply that constantly supplies preheating current to the filament of the display element, and a high voltage that applies a high voltage to the display element so that the display element lights up in a slight discharge state before the main discharge of the display element starts. A high-voltage switch circuit inserted between the high-voltage power supply, the connection point of the filament of the display element and the anode of the preheating power supply, and the cathode of the high-voltage power supply, and a switch control circuit that opens and closes the high-voltage switch circuit in synchronization with the scanning signal. The high-voltage switch circuit includes a first switch element whose energization direction is defined from the filament side toward the cathode of the high-voltage power supply and which is turned on when the control terminal is connected to the cathode of the high-voltage power supply via a predetermined resistor. , a second switch element connected in series with the resistor between the control terminal of the first switch element and the cathode of a high voltage power supply, and controlled on/off by a switch control circuit. Device.