JPH0381994U - - Google Patents
Info
- Publication number
- JPH0381994U JPH0381994U JP14351389U JP14351389U JPH0381994U JP H0381994 U JPH0381994 U JP H0381994U JP 14351389 U JP14351389 U JP 14351389U JP 14351389 U JP14351389 U JP 14351389U JP H0381994 U JPH0381994 U JP H0381994U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- dimming
- digit
- clock pulse
- 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.)
- Granted
Links
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
第１図はこの考案の一実施例による表示器の時
分割駆動装置を示す構成図、第２図は同装置の動
作を示すタイミングチヤート、第３図は従来の表
示器の時分割駆動装置を示す構成図である。
１……蛍光表示管、９……マルチプレクサ、２
２……調光パルス信号検出回路、２３……タイミ
ング回路、２４……第１のスイツチ、２８……第
２のスイツチ、２９……アンド回路、ＳＤ……調
光パルス信号、ＳＣ……検出信号、ＣＫ……クロ
ツクパルス、Ｔ１〜Ｔ４……桁信号。なお、図中
、同一符号は同一、又は相当部分を示す。
Fig. 1 is a block diagram showing a time-division drive device for a display device according to an embodiment of this invention, Fig. 2 is a timing chart showing the operation of the same device, and Fig. 3 is a diagram showing a conventional time-division drive device for a display device. FIG. 1... Fluorescent display tube, 9... Multiplexer, 2
2... Dimming pulse signal detection circuit, 23... Timing circuit, 24... First switch, 28... Second switch, 29... AND circuit, SD... Dimming pulse signal, SC... Detection Signal, CK...clock pulse, T1 to T4 ...digit signal. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
検出する調光パルス信号検出回路２２と、所定周
波数のクロツクパルスＣＫを出力するタイミング
回路２３と、前記調光パルス信号検出回路２２か
ら検出信号ＳＣが出力されたとき前記調光信号Ｓ
Ｄを選択し、前記検出信号ＳＣが出力されないと
き前記クロツクパルスＣＫを選択するスイツチ２
４と、前記スイツチ２４からのクロツクパルスＣ
Ｋ及び調光信号ＳＤを入力し、桁信号を発生する
桁信号発生回路７と、表示信号を形成する各桁の
セグメント信号を前記桁信号に同期して順次選択
出力するマルチプレクサ９と、前記調光パルス信
号検出回路２２によつて調光信号が検出されたと
き、該調光信号と前記桁信号発生回路７からの桁
信号及びマルチプレクサ９からのセグメント信号
の少なくともいずれか一方との間でアンド論理を
とるアンド回路２９又は２９′とを備え、該アン
ド回路の出力に基づきダイナミツク表示器１を駆
動することを特徴とする表示器の時分割駆動装置
。 Dimming signal SD PWM modulated according to dimming rate
A dimming pulse signal detection circuit 22 for detecting, a timing circuit 23 for outputting a clock pulse CK of a predetermined frequency, and a timing circuit 23 for outputting a clock pulse CK of a predetermined frequency;
a switch 2 which selects D and selects the clock pulse CK when the detection signal SC is not output;
4 and a clock pulse C from said switch 24.
a digit signal generation circuit 7 which inputs K and dimming signal SD and generates a digit signal; a multiplexer 9 which sequentially selects and outputs segment signals of each digit forming a display signal in synchronization with the digit signal; When a dimming signal is detected by the optical pulse signal detection circuit 22, an AND operation is performed between the dimming signal and at least one of the digit signal from the digit signal generation circuit 7 and the segment signal from the multiplexer 9. 1. A time-division drive device for a display device, comprising an AND circuit 29 or 29' that performs logic, and drives the dynamic display device 1 based on the output of the AND circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14351389U JPH0725826Y2 (en) | 1989-12-12 | 1989-12-12 | Display time-division drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14351389U JPH0725826Y2 (en) | 1989-12-12 | 1989-12-12 | Display time-division drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0381994U true JPH0381994U (en) | 1991-08-21 |
| JPH0725826Y2 JPH0725826Y2 (en) | 1995-06-07 |
Family
ID=31690282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14351389U Expired - Lifetime JPH0725826Y2 (en) | 1989-12-12 | 1989-12-12 | Display time-division drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0725826Y2 (en) |
-
1989
- 1989-12-12 JP JP14351389U patent/JPH0725826Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0725826Y2 (en) | 1995-06-07 |
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