JPS6227846U

JPS6227846U -

Info

Publication number: JPS6227846U
Application number: JP12054085U
Authority: JP
Priority date: 1985-08-05
Filing date: 1985-08-05
Publication date: 1987-02-20

Description

[Brief explanation of the drawing]

第１図はこの考案の自発光性表示装置の一実施
例を示す回路図、第２図は同上自発光性表示装置
の動作を説明するためのタイムチヤート、第３図
は従来の自発光性表示装置を示す回路図、第４図
は第３図の自発光性表示装置の動作を説明するた
めのタイムチヤートである。１……バツテリ、２……イグニツシヨンスイツ
チ、１９……調光回路、２０，Ｔ_１，Ｔ_１０１〜
Ｔ_１１０，Ｔ_４０１……トランジスタ、４０……
ライチングスイツチ、５４……コンパレータ、１
００……表示器、Ｄ_１０１〜Ｄ_１１０……発光ダ
イオード、２００……発振回路、３００……平滑
回路、４００……判断回路。なお、図中同一符号
は同一または相当部分を示す。 Fig. 1 is a circuit diagram showing an embodiment of the self-luminous display device of this invention, Fig. 2 is a time chart for explaining the operation of the self-luminous display device, and Fig. 3 is a conventional self-luminous display device. FIG. 4 is a circuit diagram showing the display device, and is a time chart for explaining the operation of the self-luminous display device shown in FIG. 1...Battery, 2...Ignition switch, 19...Dimmer circuit, 20, _T1 , _T101 ~
T ₁₁₀ , T ₄₀₁ ...transistor, 40...
Lighting switch, 54... Comparator, 1
00...Display device, _D101 - _D110 ...Light emitting diode, 200...Oscillation circuit, 300...Smoothing circuit, 400...Judgment circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

A display device equipped with a self-luminous element that emits light with a brightness that corresponds to the applied voltage, and the voltage supplied from the vehicle battery to the night illumination lamps of the instruments is controlled at a rate that corresponds to the duty cycle of the first oscillation signal. a dimmer circuit that adjusts the brightness of the lamp by adjusting the brightness of the lamp; a lighting switch that turns on the lamp and lights; and a switch element that can intermittently supply the self-luminous element with the voltage necessary for lighting it; an oscillation circuit that outputs a second oscillation signal in the form of a triangular wave or a sawtooth wave; a smoothing circuit that smooths the first oscillation signal of the dimming circuit and converts it into a DC voltage according to its duty cycle; The output signal of the smoothing circuit and the output signal of the oscillation circuit are compared, and a third oscillation signal having a duty cycle smaller than the duty cycle of the first oscillation signal of the dimming circuit is outputted. A comparison circuit that opens and closes the above-mentioned switch element according to the output signal, and a judgment is made based on the turn-on signal of the above-mentioned lighting switch, and if lighting is not turned on, the above-mentioned switch element is closed, and if lighting is turned on, the output signal of the above-mentioned comparison circuit is A self-luminous display device comprising a judgment circuit that controls the switch element to open and close based on the above.