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<h1>如何提高LED螢?zāi)坏牧炼龋?/h1> <div id="8g4444a" class="authorTimeSource"> <span>作者：</span> <span>時間：2008-08-25</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="84yi4kk" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="e4yc6i4" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="uoi4mce" class="content" id="contentDiv" style="position:relative;"> <div id="cm44weg" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/提高"><em>提高</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/亮度"><em>亮度</em></a>的方法大致上可分煞N，分e是增加晶片(chip)本身的l光量；另一N方法是有效利用晶片a生的光，增加光照射至A期方向的照射量。前者是O法<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/提高"><em>提高</em></a>晶片活性擁陌l(fā)光效率，以及改善晶片形鈐黽油獠咳」廡率，或是⒕片大型化利用高密度流增加l光量；後者是利用光波控制技g，亦即利用封b渲形成特殊的光WY，使晶片a生的光照射至A期的方向。如果<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>幕在使用後lF<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/亮度"><em>亮度</em></a>_不到A期值，可以L用以下的方法<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/提高"><em>提高</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/亮度"><em>亮度</em></a>。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/169562.htm">http://www.ex-cimer.com/article/169562.htm</a><p>1.改流^<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LED"><em>LED</em></a>的流，一般LED管允SBm工作流在20毫安培左右，除了t色LED有和F象外，其他LED亮度基本上c流^的流成比例。</p><p>2.利用人眼的X惰性，用}{u方法F灰度控制，也就是L期性改光}n度（即占空比），只要@重}c亮的L期足蚨蹋即刷新l率足蚋擼，人眼是感X不到l光象素在抖?。由於脈{u更m合於滴豢刂疲所以在普遍裼夢C硤峁LED@示熱蕕慕裉歟綴跛有的LED的控制系y通常由主控箱、咼璋搴惋@控b置三大部分M成。主控箱碾X的@示卡中@取一屏象素的各色亮度Y料，然後重新分配o若干K咼璋澹每K咼璋遑控制LED屏上的若干行（列），而每一行（列）上LED的@控信t用串列的方式魎?。臍紊種串列魎惋@示控制信的方式：一N是咼璋逕霞中控制各象素c灰度，咼璋磣鑰刂葡淶母饜邢笏氐牧煉戎顛M行分解（即}{u），然後⒏饜LED的_通信以}n形式（c亮1，不亮0）按行用串列方式鬏到相的LED上，控制其是否c亮。@N方式使用器件^少，但串列鬏的Y料量^大，因樵諞重}c亮的L期齲每象素在16灰度下需要16}n，在256灰度下需要256}n，由於器件工作l率限制，一般只能使LED屏做到16灰度。</p><p>3.咼璋宕列鬏的熱薟皇敲LED的_P信而是一8位元二M位的亮度值。每LED都有一自己的}{u器砜刂泣c(diǎn)亮rg。@櫻在一重}c亮的L期齲每象素c在16灰度下只需要4}n，256灰度下只需8}n，大大降低了串列鬏l率。用@N分散控制LED灰度的方法可以很方便地F256灰度控制。</p></span>  <div class="o84qmuw" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map 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