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onclick="setCopy('http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=2358', '链接已经复制到剪贴板');" type="submit"> <em>复制链接推荐给好友</em></button> <input type="text" class="px vm" onclick="this.select();setCopy(this.value, '链接已经复制到剪贴板');" value="http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=2358" size="50" /></p> </div> <div class="bm"> <div class="bm_c xld"> <b>[转帖]投影显示技术详解：什么是背投？:</b><div class="postmsg"> </P><B>投影显示技术详解：什么是背投？ </B><br /> <br /> 作者：王延伟 <br /> <br /> </P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> 背投(Rear Projector)是相对于正投影机(Front Projector)而言的。市场上常见、人们常提到的多媒体投影机主要是指正投影机。从原理上讲，背投和正投是相同的。简单地说，正投是观察者和投影机位于反射屏幕的同一侧，从投影机投射出来的光照射到屏幕，观察者看到的是屏幕反射回来的光；背投是观察者和投影机位于背投屏幕的两侧，将投影机安装在机身内的底部，从投影机投射出来的光照射到半透明的背投屏幕时会有部分光透过，观察者看到的是透射出来的光(如图1所示)。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> 对于使用背投的用户来说，由于投影机和屏幕合为一体，用户无需对系统进行光学调整，使用起来像使用普通电视机一样简单。由于背投是将投影机是做在箱体里的，投射到屏幕上的图像不会受到环境光的影响，因此在较亮的环境中也可以完好地显示图像。背投箱体中存在较大空间，可以方便地接入电视信号和安装优质的音响，背投电视就是这种原理的产物。背投电视根据其采用的投影机种类，可以分为CRT(阴极射线管)、LCD(液晶)、DLP(数字光处理器)、LCOS(反射液晶)等类型。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> CRT背投具有亮度高、连续使用时间长的优点，由于CRT技术非常成熟，生产规模较大，性价比高，在当前背投市场处于主导地位。CRT背投的缺点是很难提升亮度，因为它是靠荧光粉发光，容易使显像管老化，时间长了，画面会变暗，清晰度降低。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />><br /> </P><br /> <br /> <br /> <br /> <br /> <br /> <br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> </P><br /> <br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> 图1背投原理图</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> LCD背投利用非常成熟的液晶投影技术，其色彩还原性好，亮度和对比度都优于CRT背投。LCD背投由于靠灯泡发光，所以很容易提升亮度，只要提高灯泡的功率就可以了，随着技术的不断提高，灯泡寿命有了较大提升，已接近普通电视机使用的寿命。LCD背投目前还没有成为背投市场主流的主要原因是成本高；此外与CRT背投相比，虽然显示效果好，但限于其工作原理上的原因，不能做到像CRT背投那样随开随关，开机的预热和关机后的散热都需要时间。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> DLP背投亮度高，连续使用时间长，功能完备。由于采用数字处理技术，在对数字信号的再现方面具有很大优势。DLP技术可以比CRT和LCD更容易实现小型化，而且成本更低，发展前景被业界看好。前不久，美国丽讯科技推出了42/52英寸的DLP超亮背投电视，其清晰亮丽的图像表现得到了业界赞誉。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> LCOS背投具有高亮度、高解析度、低功耗的优点。目前，基于LCOS技术的产品还没有形成大规模量产，只有少数厂家(如LG、创维等)推出了几款产品。由于LCOS显示芯片的量产具有大幅度降低成本的潜力，被业界人士看好作为普及的产品技术，随着技术成熟，一旦实现大规模量产，将会有非常好的市场前景。</P><br /> <<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />> 目前市场上背投电视产品的国外品牌有日立、Sony、东芝、LG、PHILIPS、Panasonic等，国产品牌以长虹、TCL、创维为主。去年国产背投电视产量为20万台，而今年将达到30~40万台。背投电视正在日益普及，得到越来越广泛的应用。 <br /> </P></div> <div class="postmsg">我刚上完背投电视原理课,在这又有收获,谢谢你!.</div> <div class="postmsg">欢迎你们常来啊！！laowupo你问的问题也挺有价值啊！！</div> <div class="postmsg">我做这行,就爱问这些,能得到各位的帮助,谢谢各位!<img src="static/image/smiley/default/em04.gif" smilieid="33" border="0" alt="" /></div> <div class="postmsg"><br /> 刚才点错帖这次对了.<img src="static/image/smiley/default/em04.gif" smilieid="33" border="0" alt="" /></div> <div class="postmsg"><br /> 加一些旧资料.<img src="static/image/smiley/default/em05.gif" smilieid="34" border="0" alt="" /></div> <div class="postmsg"><br /> 再加一点.</div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>谢谢</P><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>教主</P><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>很强啊</P><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>加油</P></div> <div class="postmsg"><B>背投、PDP、液晶3种方式竞争前景预测</B> <br /> 来自:日经BP <br /> “围绕40～50英寸大屏幕电视市场的显示器方式之争，2006年之前主要是PDP、微显示器（MD）方式的背投式(Rear Projector)与液晶三足鼎立的局面”。以上观点是正在使用LCOS面板开发背投电视的美国Brillian公司总裁兼首席执行官Vincent F. Sollitto, Jr.在5月24日召开的“2004 Society for Information Display（SID 2004）”上的商务会议的演讲中提到的。<br /> <br /> 40～50英寸领域现在主要由CRT背投式与PDP占主导地位，但MD背投式也已开始介入竞争，目标直取价格介于两者之间的市场。而且，2005年TFT液晶第6、第7代生产线将相继问世，据此，“液晶也将正式涉足40～50英寸领域”（Sollitto）。另一方面，MD背投式在继续致力于低成本、薄型化的同时，将推出支持1080p的产品，影响力将越来越大。Sollitto预测：2006年，液晶价格将进一步降低，同时MD背投式将正式推出支持1080p的新产品，“含PDP在内的3种方式将展开激烈竞争”。此时，CRT背投式将全面降到1000美元（约合人民币8千元）以下。另外，Sollitto指出：2008年，液晶将推出60英寸的大尺寸产品，MD背投式也将进一步降低成本、致力于高精细，如此一来，“PDP的存在意义将受到置疑”。<br /> <br /> 关于背投式的介入，韩国三星电子执行副总裁Jun Souk也表示：“此前PDP与液晶的竞争今后将转变为包括DLP背投式在内的3种方式的竞争”。同时就液晶与DLP背投式的关系阐述了自己的观点：“液晶尽管厚度小，但也不得不承认与DLP背投式相比成本要高出50%、在价格方面处于劣势”。<br /> </div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>laowupo </P><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>你的显示技术不错，哈哈！！多传知识。。</P></div> <div class="postmsg">改天再把相关网站帖上大家共享。</div> <div class="postmsg"><B>http://www.worldtft.com/pro-asp/index.asp </B><B>世界液晶资讯</B><B><br /> <br /> </B><br /> <p><B>http://www.lcdfriend.com/bbs/ 液晶之友</B><B><br /> <p></B><br /> <p></div> <div class="postmsg"><<img src="static/image/smiley/default/titter.gif" smilieid="9" border="0" alt="" />>http://www.lcdfriend.com/bbs/</P></div> <div style="height200px;"></div> <ul class="xl xl2 cl" style="border-top: 1px #cccccc dashed;margin:5px 0 ;padding-top:5px"> <dl><b> 同一主题资料:</b></dl><dl class='icon'><img src="static/image/filetype/msoffice.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=2291" title="8962JtEL.doc">8962JtEL.doc</a> <font color="#AAAAAA">(38.5 KB)</font> </dl> <dl class='icon'><img src="static/image/filetype/msoffice.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=2358" title="XWlpLgl8.doc">XWlpLgl8.doc</a> <font color="#AAAAAA">(84.5 KB)</font> </dl> <dl class='icon'><img src="static/image/filetype/msoffice.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=2359" title="ttLbcvSL.doc">ttLbcvSL.doc</a> <font color="#AAAAAA">(84 KB)</font> </dl> <dl class='icon'><img src="static/image/filetype/unknown.gif" border="0" class="vm" alt="" /> <a href="attachcenter-page.html?aid=2534" title="AaiDWL7A.mht">AaiDWL7A.mht</a> <font color="#AAAAAA">(163.74 KB)</font> </dl> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a href="http://wpa.qq.com/msgrd?V=3&Uin=20600600&Site=光电工程师社区&Menu=yes&from=discuz" target="_blank" title="QQ"><img src="static/image/common/site_qq.jpg" alt="QQ" /></a><span class="pipe">|</span><a href="http://m.oecr.com" >手机版</a><span class="pipe">|</span><a href="http://so.oecr.com" title="站内搜索" target="_blank" >搜索</a><span class="pipe">|</span><a href="http://www.focaloptics.com" title="主办单位：武汉焦点光学技术有限公司" target="_blank" >焦点光学</a><span class="pipe">|</span><a href="http://www.oecr.com" target="_blank">光电工程师社区</a> ( <a href="http://beian.miit.gov.cn/" target="_blank">鄂ICP备17021725号-1</a> <a href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=42011102000821" target="_blank">鄂网安备42011102000821号</a> ) <span id="tcss"></span><script type="text/javascript" src="http://tcss.qq.com/ping.js?v=1eOg" charset="utf-8"></script><script type="text/javascript" reload="1">pgvMain({"discuzParams":{"r2":"1028778","ui":0,"rt":"plugin","pn":1,"qq":"000"},"extraParams":""});</script></p> <p class="xs0"> <span id="debuginfo"> Copyright 2015 光电工程师社区 版权所有 All Rights Reserved. </span> </p> </div> <div id="ftl" > <p>申明：本站为非盈利性公益个人网站，已关闭注册功能，本站所有内容均为网络收集整理，不代表本站立场。如您对某些内容有质疑或不快，请及时联系我们处理！ </p> </div> <div id="frt" > <div class="wp"> <p class="dd01"> © 2001-2022 <a href="http://www.oecr.com" target="_blank">光电工程师社区</a> 网站备案号：<a href="https://beian.miit.gov.cn/">鄂ICP备17021725号</a> 网站公安备案号：<a href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=42011102000821">鄂42011102000821号</a> Powered by <a href="http://www.discuz.net" target="_blank">Discuz!</a> <em>X3.2</em> </p><p class="dd02">GMT+8, 2025-12-17 00:45 </p> </div> </div></div> </div> </div> <!--bottombg结束--> <script src="home.php?mod=misc&ac=sendmail&rand=1765903500" type="text/javascript"></script> <!--<div id="scrolltop"> <span hidefocus="true"><a title="返回顶部" onclick="window.scrollTo('0','0')" class="scrolltopa" ><b>返回顶部</b></a></span> </div> --> <div id="scrolltop"> <span hidefocus="true"><a title="返回顶部" onclick="window.scrollTo('0','0')" class="scrolltopa" ><b>返回顶部</b></a></span> </div> <script type="text/javascript">_attachEvent(window, 'scroll', function () { showTopLink(); });checkBlind();</script> <div id="discuz_tips" style="display:none;"></div> <script type="text/javascript"> var tipsinfo = '1028778|X3.2|0.6||0||0|7|1765903500|a4a012d4bdb9dd7476fa13a2aee4936a|2'; </script> <script src="http://discuz.gtimg.cn/cloud/scripts/discuz_tips.js?v=1" type="text/javascript" charset="UTF-8"></script></body></html>