JPH0362396U - - Google Patents
Info
- Publication number
- JPH0362396U JPH0362396U JP12351489U JP12351489U JPH0362396U JP H0362396 U JPH0362396 U JP H0362396U JP 12351489 U JP12351489 U JP 12351489U JP 12351489 U JP12351489 U JP 12351489U JP H0362396 U JPH0362396 U JP H0362396U
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- light emitting
- circuit
- frequency conversion
- conversion 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
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Description
第１図は本考案による発光表示装置の輝度制御
回路の基本的な一実施例を示す回路ブロツク図、
第２図はダイナミツク点灯方式に応用した場合の
実施例を示す回路ブロツク図、第３図は、第２図
における輝度制御を説明するための各回路出力の
波形の一例を示すタイミング図である。
１……光センサ、２……周波数変換回路、３…
…パルス発生回路、４……アンドゲート、５……
ドライバ、６……発光ダイオード、７……２ビツ
トカウンタ、８……デコーダ、９，１０……駆動
回路。
FIG. 1 is a circuit block diagram showing a basic embodiment of a brightness control circuit for a light emitting display device according to the present invention;
FIG. 2 is a circuit block diagram showing an embodiment when applied to a dynamic lighting system, and FIG. 3 is a timing diagram showing an example of waveforms of each circuit output to explain the brightness control in FIG. 2. 1... Optical sensor, 2... Frequency conversion circuit, 3...
...Pulse generation circuit, 4...AND gate, 5...
Driver, 6... Light emitting diode, 7... 2-bit counter, 8... Decoder, 9, 10... Drive circuit.
Claims (1)
として検出する光センサと、前記光センサが検出
した電流に比例した周波数のパルスを発生する周
波数変換回路と、前記周波数変換回路が出力する
パルスごとに一定幅のパルスを出力するパルス発
生回路と、前記パルス発生回路のパルスが発生し
ている期間だけ発光素子を駆動する駆動回路とを
含み、前記発光素子をパルス密度駆動制御するこ
とを特徴とする発光表示装置の輝度制御回路。 (2) 装置の周囲または視野範囲の明るさを電流
として検出する光センサと、前記光センサが検出
した電流に比例した周波数のパルスを発生する周
波数変換回路と、前記周波数変換回路が出力する
パルスごとに一定幅のパルスを出力するパルス発
生回路と、前記周波数変換回路が出力するパルス
数を計数するカウンタと、前記カウンタ出力によ
り前記パルス発生回路の一定幅のパルスを複数個
の出力端子に順番に送出し、これを繰り返すデコ
ーダと、前記デコーダの複数の出力端子に接続さ
れ、前記パルスが発生している期間だけ複数の発
光素子をそれぞれ駆動する駆動回路とを含み、前
記複数の発光素子を順番にパルス密度駆動制御す
ることを特徴とする発光表示装置の輝度制御回路
。[Claims for Utility Model Registration] (1) An optical sensor that detects the brightness around the device or the visual field as an electric current, and a frequency conversion circuit that generates a pulse with a frequency proportional to the electric current detected by the optical sensor; The light emitting device includes a pulse generation circuit that outputs a pulse of a constant width for each pulse output by the frequency conversion circuit, and a drive circuit that drives the light emitting element only during a period when the pulse of the pulse generation circuit is generated. A brightness control circuit for a light emitting display device characterized by pulse density driving control. (2) an optical sensor that detects the brightness around the device or the visual field as an electric current; a frequency conversion circuit that generates a pulse with a frequency proportional to the electric current detected by the optical sensor; and a pulse that the frequency conversion circuit outputs. a pulse generation circuit that outputs a pulse of a constant width every time, a counter that counts the number of pulses output by the frequency conversion circuit; the plurality of light emitting elements, the drive circuit being connected to a plurality of output terminals of the decoder and driving each of the plurality of light emitting elements only during the period in which the pulses are generated; A brightness control circuit for a light emitting display device, characterized by sequential pulse density driving control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12351489U JPH0362396U (en) | 1989-10-20 | 1989-10-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12351489U JPH0362396U (en) | 1989-10-20 | 1989-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0362396U true JPH0362396U (en) | 1991-06-18 |
Family
ID=31671488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12351489U Pending JPH0362396U (en) | 1989-10-20 | 1989-10-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0362396U (en) |
-
1989
- 1989-10-20 JP JP12351489U patent/JPH0362396U/ja active Pending
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