JPS636489U

JPS636489U -

Info

Publication number: JPS636489U
Application number: JP10001186U
Authority: JP
Priority date: 1986-06-30
Filing date: 1986-06-30
Publication date: 1988-01-16

Description

[Brief explanation of the drawing]

図面はいずれもこの考案の実施例に係り、第１
図は表示器を有する装置にこの考案による輝度調
整回路が適用された場合のブロツク線図、第２図
は動作原理説明用の波形図、第３図は全体動作説
明用のタイミング図、第４図はこの考案の変形実
施例を示すブロツク線図、第５図は変形実施例に
おける全体動作説明用のタイミング図である。図中、１は被測定信号源、２はＡ／Ｄコンバー
タ、５は表示器、６，１６は通電パルス形成回路
、７は光センサ、８，１５はパルス幅制御回路、
９ないし１２は単安定マルチバイブレータ、２１
ないし２４はカウンタである。 The drawings all relate to embodiments of this invention and are
The figure is a block diagram when the brightness adjustment circuit according to this invention is applied to a device having a display, FIG. 2 is a waveform diagram for explaining the operating principle, FIG. 3 is a timing diagram for explaining the overall operation, and FIG. The figure is a block diagram showing a modified embodiment of this invention, and FIG. 5 is a timing diagram for explaining the overall operation of the modified embodiment. In the figure, 1 is a signal source to be measured, 2 is an A/D converter, 5 is a display, 6 and 16 are energizing pulse forming circuits, 7 is an optical sensor, 8 and 15 are pulse width control circuits,
9 to 12 are monostable multivibrators, 21
24 are counters.

Claims

[Claims for Utility Model Registration] (1) The signal to be measured is digitally converted by an A/D converter and applied to the LED element, and the digit signal from the A/D converter is used to convert the signal to the LED element.
In the brightness adjustment circuit of a dynamic lighting type display that switches elements, there is an energizing pulse forming circuit that is triggered by the above-mentioned digit signal and generates a pulse signal for switching, and a energizing pulse forming circuit that receives the brightness signal from the above-mentioned energizing pulse forming circuit. 1. A brightness adjustment circuit for a display device, comprising: a pulse width control circuit that sets the width of a pulse signal to be sent out to a desired value. (2) The pulse width control circuit has a detector that detects a difference between a voltage at a predetermined level and the luminance signal, and the energizing pulse forming circuit converts the detection output of the detector into a threshold voltage for inversion. 2. A brightness adjustment circuit for a display device according to claim 1, comprising a monostable multivibrator. (3) The pulse width control circuit has an oscillator whose frequency changes depending on the luminance signal, and the energizing pulse forming circuit includes a counter that counts the frequency of the oscillator by a fixed number. The brightness adjustment circuit for the display device described in . (4) The brightness adjustment circuit for a display device according to claim 1, 2, or 3, wherein the brightness signal is obtained through an optical sensor.