JPS59149300U - LED drive circuit - Google Patents
LED drive circuitInfo
- Publication number
- JPS59149300U JPS59149300U JP1983042050U JP4205083U JPS59149300U JP S59149300 U JPS59149300 U JP S59149300U JP 1983042050 U JP1983042050 U JP 1983042050U JP 4205083 U JP4205083 U JP 4205083U JP S59149300 U JPS59149300 U JP S59149300U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- counter
- memory
- output
- 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
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Facsimile Heads (AREA)
- Facsimile Scanning Arrangements (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図ａは、ＬＥＤアレイ内での各ＬＥＤの輝度バラツ
キの説明図、第１図すは複数のＬＥＤアレ−イを組合せ
た時の輝度バラツキの説明図、第２図は従来の技術によ
る回路結線図、第３図は第２図の各部信号の説明図、第
４図は本考案の第１実施例の回路結線図、第５図は第４
図の各部信号説明図、第６図は本考案の別の実施例の回
路図、第７図は第６図の信号説明図である。
１１〜１１０・・・ＬＥＤアレイ、２１〜２１１・・・
電流増幅器、３１〜３１１・・・電流供給端子、４・・
・シフトレジスタ、５・・・比較回路、６・・・カウン
タ、７・・・シリアル−パラレル変換器、８・・・画素
メモリ、９川カウンタ、１０・・・発光時間調整用メモ
リ、１１１〜１１１ｏ・・・可変電圧源、１２．〜１２
１ｏ・・・電圧供給端子、１３１〜１３１ｏ・・・セレ
クト端子、１４・・・パルス発生器。
５１
５２−−−
５３ ｆ
−５Ｅ１．−−５
：
−ＥＬＩＯ
］■ニニニー「−一一一Figure 1a is an explanatory diagram of the luminance variation of each LED within the LED array, Figure 1 is an explanatory diagram of the luminance variation when multiple LED arrays are combined, and Figure 2 is an illustration of the luminance variation according to the conventional technology. 3 is an explanatory diagram of each part signal of FIG. 2, FIG. 4 is a circuit connection diagram of the first embodiment of the present invention, and FIG.
FIG. 6 is a circuit diagram of another embodiment of the present invention, and FIG. 7 is an explanatory diagram of signals in FIG. 6. 11-110...LED array, 21-211...
Current amplifier, 31-311... Current supply terminal, 4...
- Shift register, 5... Comparison circuit, 6... Counter, 7... Serial-parallel converter, 8... Pixel memory, 9 River counter, 10... Memory for light emission time adjustment, 111- 111o... variable voltage source, 12. ~12
1o...Voltage supply terminal, 131-131o...Select terminal, 14...Pulse generator. 51 52--- 53 f -5E1. --5:
-ELIO ] ■ Ninini “-111
Claims (1)
通電電流を制御する手段を備え、各発光素子アレイ内の
発光素子については各発光素子の発光もしくは矢先状態
を記憶する画素メモリと、各発光素子に通電電流を供給
する電流増幅回路と、発光の基準時間を計数するカウン
タと、当該カウンタの各計数値において進運的に各発光
素子アレイ内の各発光素子の輝度が均一となるごとく発
光時間の調整量を出力するメモリと、当該メモリの出力
と前記画素メモリの出力とを比較しかつその比較出力に
従って前記電流増幅回路を駆動し、その駆動時間を制御
する手段とを有することを特徴とするＬＥＤ駆動回路。It is equipped with a plurality of light emitting element arrays and a means for independently controlling the energizing current for each light emitting element array, and for each light emitting element array, a pixel memory that stores the light emission or arrow tip state of each light emitting element, A current amplification circuit that supplies current to the light emitting elements, a counter that counts the reference time of light emission, and a counter that counts the reference time of light emission so that the brightness of each light emitting element in each light emitting element array becomes uniform based on each count value of the counter. The present invention includes a memory for outputting an adjustment amount of light emitting time, and means for comparing the output of the memory with the output of the pixel memory and driving the current amplification circuit according to the comparison output to control the driving time. Features LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983042050U JPS59149300U (en) | 1983-03-25 | 1983-03-25 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1983042050U JPS59149300U (en) | 1983-03-25 | 1983-03-25 | LED drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59149300U true JPS59149300U (en) | 1984-10-05 |
| JPH0221829Y2 JPH0221829Y2 (en) | 1990-06-12 |
Family
ID=30172610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1983042050U Granted JPS59149300U (en) | 1983-03-25 | 1983-03-25 | LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59149300U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52129444A (en) * | 1976-04-22 | 1977-10-29 | Nippon Signal Co Ltd:The | Heat generating element for heating apparatus |
| JPS5632468U (en) * | 1979-08-21 | 1981-03-30 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5535156A (en) * | 1978-09-04 | 1980-03-12 | Sanden Corp | Volume type fluid compressor |
-
1983
- 1983-03-25 JP JP1983042050U patent/JPS59149300U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52129444A (en) * | 1976-04-22 | 1977-10-29 | Nippon Signal Co Ltd:The | Heat generating element for heating apparatus |
| JPS5632468U (en) * | 1979-08-21 | 1981-03-30 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0221829Y2 (en) | 1990-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS62218155A (en) | Led array head | |
| JPS59149300U (en) | LED drive circuit | |
| JPH0550489U (en) | Light emitting device | |
| JPS6026854U (en) | optical print head | |
| JPH09244570A (en) | Light emitting diode(led) display driving device | |
| JPS59132276U (en) | Light emitting element drive circuit | |
| JPH05136461A (en) | Led drive circuit for optical transmitter | |
| JPH0611364U (en) | Light emitting element drive circuit | |
| JPS59153135U (en) | LED drive circuit | |
| JPS61141489A (en) | Display unit | |
| JPS6123746U (en) | Selective call receiver display circuit | |
| JPS6234454U (en) | ||
| JPS5845587U (en) | Light emitting diode drive circuit | |
| JPS6156694U (en) | ||
| JPS59114591U (en) | display device | |
| JPH07101333B2 (en) | Information display device | |
| JPS6083972U (en) | Tape recorder display circuit | |
| JPS60133499U (en) | LED array drive circuit | |
| JPS6449896U (en) | ||
| JPS5946498U (en) | lamp control device | |
| JPS59104191U (en) | Fluorescent display tube dimmer circuit | |
| JPS5930189U (en) | display device | |
| JPS60233796A (en) | Light emitting diode driving circuit | |
| JPS6041194A (en) | Display unit | |
| JPS5821814U (en) | binary display device |