JPS636489U - - Google Patents
Info
- Publication number
- JPS636489U JPS636489U JP10001186U JP10001186U JPS636489U JP S636489 U JPS636489 U JP S636489U JP 10001186 U JP10001186 U JP 10001186U JP 10001186 U JP10001186 U JP 10001186U JP S636489 U JPS636489 U JP S636489U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- brightness adjustment
- display device
- adjustment circuit
- 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
- 238000003079 width control Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 230000001960 triggered effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
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 (1)
ジタル変換してLED素子に与えるとともに、上
記A/Dコンバータからの桁信号にて上記LED
素子をスイツチングするダイナミツク点灯形表示
器の輝度調整回路において、 上記桁信号によりトリガされて作動し、スイツ
チング用のパルス信号を発生する通電パルス形成
回路と、輝度信号を受けて上記通電パルス形成回
路から送出されるパルス信号の幅を所望値に設定
するパルス幅制御回路とを備えていることを特徴
とする表示器の輝度調整回路。 (2) 上記パルス幅制御回路は所定レベルの電圧
に対する上記輝度信号との差を検出する検出器を
有し、上記通電パルス形成回路は上記検出器の検
出出力を反転用のしきい値電圧とする単安定マル
チバイブレータを備えている実用新案登録請求の
範囲第1項記載の表示器の輝度調整回路。 (3) 上記パルス幅制御回路は上記輝度信号によ
り周波数が変化する発振器を有し、上記通電パル
ス形成回路は上記発振器の周波数を一定数計数す
るカウンタを備えている実用新案登録請求の範囲
第1項記載の表示器の輝度調整回路。 (4) 上記輝度信号は光センサを介して得られる
ようにした実用新案登録請求の範囲第1項又は第
2項又は第3項記載の表示器の輝度調整回路。[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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10001186U JPS636489U (en) | 1986-06-30 | 1986-06-30 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10001186U JPS636489U (en) | 1986-06-30 | 1986-06-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS636489U true JPS636489U (en) | 1988-01-16 |
Family
ID=30969422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10001186U Pending JPS636489U (en) | 1986-06-30 | 1986-06-30 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS636489U (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52143071A (en) * | 1976-05-24 | 1977-11-29 | Sanyo Electric Co Ltd | Brightness modulation circuit for electronic timepiece |
JPS52142995A (en) * | 1976-05-24 | 1977-11-29 | Kanto Seiki Co | Indicator brightness controller |
JPS5516593B2 (en) * | 1972-08-02 | 1980-05-02 | ||
JPS58173793A (en) * | 1982-04-06 | 1983-10-12 | 株式会社精工舎 | Automatic light adjustor |
-
1986
- 1986-06-30 JP JP10001186U patent/JPS636489U/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5516593B2 (en) * | 1972-08-02 | 1980-05-02 | ||
JPS52143071A (en) * | 1976-05-24 | 1977-11-29 | Sanyo Electric Co Ltd | Brightness modulation circuit for electronic timepiece |
JPS52142995A (en) * | 1976-05-24 | 1977-11-29 | Kanto Seiki Co | Indicator brightness controller |
JPS58173793A (en) * | 1982-04-06 | 1983-10-12 | 株式会社精工舎 | Automatic light adjustor |
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