LCD驱动器程序_MCU-LCD_驱动编程_Linux/Unix编程下载-pudn.com

<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/6253f3c274bc5c0105113836/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253f3c274bc5c0105113836/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h2 y2 ff2 fs0 fc0 sc1 ls1 ws0">中颖电子股份有限公司<span class="_ _0"></span><span class="ff1 sc0 ls0"> </span></div><div class="t m0 x3 h3 y3 ff1 fs1 fc0 sc0 ls2 ws1">SINO WEAL<span class="_ _1"></span>TH MICROELECTRONICS CORP<span class="_ _2"></span> L<span class="_ _1"></span>TD </div><div class="t m0 x4 h3 y4 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x4 h4 y5 ff2 fs2 fc0 sc0 ls0 ws0">页次<span class="ff3 ls3">(PAGE)</span><span class="ff4"> <span class="_ _3"></span><span class="ff3 fs3 ls4 ws2">1 / </span></span></div><div class="t m0 x4 h5 y6 ff3 fs3 fc0 sc0 ls4 ws0">15</div><div class="t m0 x5 h6 y7 ff4 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x6 h3 y8 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h4 y9 ff3 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x8 h7 ya ff1 fs4 fc0 sc0 ls0 ws3">LCD Driver(<span class="ff2 sc1 ws0">液晶驱动器</span><span class="ls5 ws0">) </span></div><div class="t m0 x9 h6 yb ff2 fs2 fc0 sc0 ls0 ws0">在单片机的应用中，<span class="_ _1"></span>人机界面占据相当重要的地位。<span class="_ _1"></span>人机界面主要包括事件输入和</div><div class="t m0 x7 h6 yc ff2 fs2 fc0 sc0 ls0 ws0">结果指示，<span class="_ _4"></span>事件输入包括键盘输入，<span class="_ _4"></span>通讯接口，<span class="_ _4"></span>事件中断等，<span class="_ _4"></span>结果指示包括<span class="_ _5"> </span>LED/LCD<span class="_ _5"> </span>显</div><div class="t m0 x7 h6 yd ff2 fs2 fc0 sc0 ls0 ws0">示、通讯接口、外围设备操作等。而在这些人机界面当中，LCD <span class="_ _6"></span>显示技术由于其具有界</div><div class="t m0 x7 h6 ye ff2 fs2 fc0 sc0 ls0 ws0">面友好，成本较低等特点而在很多应用场合得以广泛应用。 </div><div class="t m0 x7 h6 yf ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h8 y10 ff1 fs5 fc0 sc0 ls6 ws0">1.LCD<span class="_"> </span><span class="ff2 sc1 ls7">的显示原理</span><span class="ls0"> </span></div><div class="t m0 x7 h6 y11 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x9 h6 y12 ff2 fs2 fc0 sc0 ls0 ws0">在讲解<span class="_ _5"> </span>LCD driver<span class="_ _5"> </span>之前，我们先就<span class="_ _5"> </span>LCD<span class="_ _5"> </span>的显示原理作一简单的介绍。 </div><div class="t m0 x9 h6 y13 ff2 fs2 fc0 sc0 ls0 ws0">LCD(Liquid Crystal Display)是利用液晶分子的物理结构和光学特性进行显示的</div><div class="t m0 x7 h6 y14 ff2 fs2 fc0 sc0 ls0 ws0">一种技术。液晶分子的特性： </div><div class="t m0 x9 h6 y15 ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">液晶分子是介于固体和液体之间的一种棒状结构的大分子物质； </span></span></div><div class="t m0 x9 h6 y16 ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">在自然形态，<span class="_ _2"></span>具有光学各向异性的特点，<span class="_ _2"></span>在电(磁)场作用下，<span class="_ _2"></span>呈各向同性特点；<span class="_ _8"></span> </span></span></div><div class="t m0 x9 h6 y17 ff2 fs2 fc0 sc0 ls0 ws0">下面以直视型简单多路<span class="_ _5"> </span>TN/STN <span class="_ _6"></span>LCD <span class="_ _3"></span>Panel(液晶显示面板)的基本结构介绍<span class="_ _5"> </span>LCD<span class="_ _5"> </span>的基</div><div class="t m0 x7 h6 y18 ff2 fs2 fc0 sc0 ls0 ws0">本显示原理，示意图如图-1： </div><div class="t m0 xa h6 y19 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 xb h6 y1a ff2 fs2 fc0 sc0 ls0 ws0">图-1 LCD<span class="_ _5"> </span>的基本显示原理 </div><div class="t m0 x7 h6 y1b ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 xc h4 y1c ff3 fs2 fc0 sc0 ls8 ws0"> </div><div class="t m0 xc h4 y1d ff3 fs2 fc0 sc0 ls9 ws4">T<span class="_ _2"></span>el: (755) 2518-1447 <span class="_ _9"> </span> <span class="_ _a"> </span> </div><div class="t m0 xd h4 y1e ff3 fs2 fc0 sc0 ls9 ws5">Fax: <span class="_ _3"></span>(755) <span class="_ _6"></span>2518-1987 <span class="_ _b"> </span><span class="lsa ws0">V1.0<span class="_ _c"></span><span class="ff2 ls0">版本：</span></span></div><div class="t m0 x7 h5 y1f ff3 fs3 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div> </body> </html>

<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253f3c274bc5c0105113836/bg2.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h2 y2 ff2 fs0 fc0 sc1 ls1 ws0">中颖电子股份有限公司<span class="_ _0"></span><span class="ff1 sc0 ls0"> </span></div><div class="t m0 x3 h3 y3 ff1 fs1 fc0 sc0 ls2 ws1">SINO WEAL<span class="_ _1"></span>TH MICROELECTRONICS CORP<span class="_ _2"></span> L<span class="_ _1"></span>TD </div><div class="t m0 x4 h3 y4 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x4 h4 y5 ff2 fs2 fc0 sc0 ls0 ws0">页次<span class="ff3 ls3">(PAGE)</span><span class="ff4"> <span class="_ _3"></span><span class="ff3 fs3 ls4 ws2">2 / </span></span></div><div class="t m0 x4 h5 y6 ff3 fs3 fc0 sc0 ls4 ws0">15</div><div class="t m0 x5 h6 y7 ff4 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x6 h3 y8 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h4 y9 ff3 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x9 h6 y20 ff2 fs2 fc0 sc0 ls0 ws0">整个<span class="_ _5"> </span>LCD <span class="_ _6"></span>Panel<span class="_ _5"> </span>由上下玻璃基板和偏振片组成，在上下玻璃之间，按照螺旋结构将</div><div class="t m0 x7 h6 y21 ff2 fs2 fc0 sc0 ls0 ws0">液晶分子有规律的进行涂层。<span class="_ _6"></span>液晶面板的电极是通过一种<span class="_ _5"> </span>ITO<span class="_ _5"> </span>的金属化合物蚀刻在上下</div><div class="t m0 x7 h6 y22 ff2 fs2 fc0 sc0 lsb ws0">玻璃基板上。<span class="_ _4"></span>如图所示，<span class="_ _4"></span>液晶分子的排列为螺旋结构，<span class="_ _4"></span>对光线具有旋旋光性，<span class="_ _4"></span>上下偏振</div><div class="t m0 x7 h6 y23 ff2 fs2 fc0 sc0 ls0 ws0">片的偏振角度相互垂直。<span class="_ _2"></span>在上下基板间的电压为<span class="_ _5"> </span>0<span class="_ _5"> </span>时，<span class="_ _2"></span>自然光通过偏振片后，<span class="_ _2"></span>只有与偏</div><div class="t m0 x7 h6 y24 ff2 fs2 fc0 sc0 ls0 ws0">振片方向相同的光线得以进入液晶分子的螺旋结构的涂层中，<span class="_ _6"></span>由于螺旋结构的的旋旋光</div><div class="t m0 x7 h6 y25 ff2 fs2 fc0 sc0 ls0 ws0">性，将入射光线的方向旋转<span class="_ _5"> </span>90<span class="_ _5"> </span>度后照射到另一端的偏振片上，由于上下偏振片的偏振</div><div class="t m0 x7 h6 y26 ff2 fs2 fc0 sc0 ls0 ws0">角度相互垂直，<span class="_ _1"></span>这样入射光线通过另一端的偏振片完全的射出，<span class="_ _1"></span>光线完全进入观察者的</div><div class="t m0 x7 h6 y27 ff2 fs2 fc0 sc0 ls0 ws0">眼中，<span class="_ _2"></span>看到的效果就为白色。<span class="_ _2"></span>而在上下基板间的电压为一交流电压时，<span class="_ _2"></span>液晶分子的螺旋</div><div class="t m0 x7 h6 y28 ff2 fs2 fc0 sc0 ls0 ws0">结构在电(磁)场的作用下，<span class="_ _2"></span>变成了同向排列结构，<span class="_ _2"></span>对光线的方向没有作任何旋转，<span class="_ _2"></span>而上</div><div class="t m0 x7 h6 y29 ff2 fs2 fc0 sc0 ls0 ws0">下偏振片的偏振角度相互垂直，<span class="_ _1"></span>这样入射光线就无法通过另一端的偏振片射出，<span class="_ _1"></span>光线无</div><div class="t m0 x7 h6 y2a ff2 fs2 fc0 sc0 ls0 ws0">法进入观察者的眼中，<span class="_ _1"></span>看到的效果就为黑色。<span class="_ _1"></span>这样通过在上下玻璃基板电极间施加不同</div><div class="t m0 x7 h6 y2b ff2 fs2 fc0 sc0 ls0 ws0">的交流电压，即可实现液晶显示的两种基本状态亮(On)和暗(Off)。 </div><div class="t m0 x9 h6 y2c ff2 fs2 fc0 sc0 ls0 ws0">在实际的液晶模以驱动电压中，有几个参数非常关键： </div><div class="t m0 x9 h6 y2d ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">交流电压，液晶分子是需要交流信号来驱动的，长时间的直流电压加在液晶分</span></span></div><div class="t m0 xe h6 y2e ff2 fs2 fc0 sc0 ls0 ws0">子两端，会影响液晶分子的电气化学特性，引起显示模糊，寿命的减少，其破</div><div class="t m0 xe h6 y2f ff2 fs2 fc0 sc0 ls0 ws0">坏性为不可恢复； </div><div class="t m0 x9 h6 y30 ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">扫描频率，直接驱动液晶分子的交流电压的频率一般在<span class="_ _5"> </span>60～100Hz<span class="_ _5"> </span>之间，具体</span></span></div><div class="t m0 xe h6 y31 ff2 fs2 fc0 sc0 ls0 ws0">是依据<span class="_ _5"> </span>LCD Panel<span class="_ _5"> </span>的面积和设计而定，频率过高，会导致驱动功耗的增加，频</div><div class="t m0 xe h6 y32 ff2 fs2 fc0 sc0 ls0 ws0">率过低，会导致显示闪烁，同时如果扫描频率同光源的频率之间有倍数关系，</div><div class="t m0 xe h6 y33 ff2 fs2 fc0 sc0 ls0 ws0">则显示也会有闪烁现象出现。 </div><div class="t m1 xf h9 y34 ff6 fs6 fc0 sc0 ls0 ws0"> COM1<span class="_ _d"></span>COM1</div><div class="t m2 xb ha y35 ff6 fs7 fc0 sc0 ls0 ws0">ONE FRAME</div><div class="t m0 x10 h6 y36 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x11 h6 y37 ff2 fs2 fc0 sc0 ls0 ws0">图-2 帧频(Frame)示意图 </div><div class="t m0 x9 h6 y38 ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">液晶分子是一种电压积分型材料，它的扭曲程度(透光性)仅仅和极板间电压的</span></span></div><div class="t m0 xe h6 y39 ff2 fs2 fc0 sc0 ls0 ws0">有效值有关，和充电波形无关。电压的有效值用<span class="_ _5"> </span>COM/SEG<span class="_ _5"> </span>之间的电压差值的均</div><div class="t m0 xe h6 y3a ff2 fs2 fc0 sc0 ls0 ws0">方根<span class="_ _5"> </span>VRMS<span class="_ _5"> </span>表示： </div><div class="t m3 x12 hb y3b ff7 fs8 fc0 sc0 lsc ws0">[]</div><div class="t m0 x13 hc y3c ff8 fs9 fc0 sc0 ls0 ws0">dt<span class="_ _e"></span>t<span class="_ _f"></span>V</div><div class="t m0 x14 hc y3d ff8 fs9 fc0 sc0 ls0 ws0">T</div><div class="t m0 x15 hc y3c ff8 fs9 fc0 sc0 ls0 ws0">RMS<span class="_ _10"></span>V</div><div class="t m0 x16 hd y3e ff8 fsa fc0 sc0 ls0 ws0">T</div><div class="t m0 x17 he y3f ff3 fsa fc0 sc0 ls0 ws0">2</div><div class="t m0 x18 he y40 ff3 fsa fc0 sc0 ls0 ws0">0</div><div class="t m0 x19 hf y3c ff3 fs9 fc0 sc0 ls0 ws0">)<span class="_ _11"></span>(</div><div class="t m0 x1a hf y41 ff3 fs9 fc0 sc0 ls0 ws0">1</div><div class="t m0 x1b hf y3c ff3 fs9 fc0 sc0 ls0 ws0">)<span class="_ _12"></span>(</div><div class="t m0 x1c h10 y42 ff7 fsb fc0 sc0 ls0 ws0">∫</div><div class="t m0 x1d h11 y3c ff7 fs9 fc0 sc0 ls0 ws0">=</div><div class="t m0 x1e h6 y43 ff2 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h12 y44 ff2 fs5 fc0 sc0 ls0 ws0"> <span class="_ _13"> </span><span class="fs2">LCD<span class="_ _5"> </span>显示黑白(透光和不透光)的电压有效值的分界电压称为开启电压<span class="_ _5"> </span>Vth，当电压</span></div><div class="t m0 x7 h6 y45 ff2 fs2 fc0 sc0 ls0 ws0">有效值超过<span class="_ _5"> </span>Vth，<span class="_ _1"></span>螺旋结构的旋光角度加大，<span class="_ _1"></span>透光率急剧变化，<span class="_ _1"></span>透明度急剧上升。<span class="_ _1"></span>反之，</div><div class="t m0 x7 h6 y46 ff2 fs2 fc0 sc0 ls0 ws0">则透明度急剧下降。光线的透射率与交流电压的有效值的关系如图-3： </div><div class="t m0 xc h4 y1c ff3 fs2 fc0 sc0 ls8 ws0"> </div><div class="t m0 xc h4 y1d ff3 fs2 fc0 sc0 ls9 ws4">T<span class="_ _2"></span>el: (755) 2518-1447 <span class="_ _9"> </span> <span class="_ _a"> </span> </div><div class="t m0 xd h4 y1e ff3 fs2 fc0 sc0 ls9 ws5">Fax: <span class="_ _3"></span>(755) <span class="_ _6"></span>2518-1987 <span class="_ _b"> </span><span class="lsa ws0">V1.0<span class="_ _c"></span><span class="ff2 ls0">版本：</span></span></div><div class="t m0 x7 h5 y1f ff3 fs3 fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div>

<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/6253f3c274bc5c0105113836/bg3.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> </div><div class="t m0 x2 h2 y2 ff2 fs0 fc0 sc1 ls1 ws0">中颖电子股份有限公司<span class="_ _0"></span><span class="ff1 sc0 ls0"> </span></div><div class="t m0 x3 h3 y3 ff1 fs1 fc0 sc0 ls2 ws1">SINO WEAL<span class="_ _1"></span>TH MICROELECTRONICS CORP<span class="_ _2"></span> L<span class="_ _1"></span>TD </div><div class="t m0 x4 h3 y4 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x4 h4 y5 ff2 fs2 fc0 sc0 ls0 ws0">页次<span class="ff3 ls3">(PAGE)</span><span class="ff4"> <span class="_ _3"></span><span class="ff3 fs3 ls4 ws2">3 / </span></span></div><div class="t m0 x4 h5 y6 ff3 fs3 fc0 sc0 ls4 ws0">15</div><div class="t m0 x5 h6 y7 ff4 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m0 x6 h3 y8 ff1 fs1 fc0 sc0 ls0 ws0"> </div><div class="t m0 x7 h4 y9 ff3 fs2 fc0 sc0 ls0 ws0"> </div><div class="t m4 x1f h13 y47 ff6 fsc fc0 sc0 lsd ws0">100</div><div class="t m4 x20 h13 y48 ff6 fsc fc0 sc0 lsd ws0">90</div><div class="t m4 x20 h13 y49 ff6 fsc fc0 sc0 lsd ws0">10</div><div class="t m4 x21 h13 y4a ff6 fsc fc0 sc0 ls0 ws0">0</div><div class="t m5 x22 h13 y4b ff6 fsc fc0 sc0 lse ws6">Transparent Degree(Relati<span class="_ _14"></span>ve)</div><div class="t m4 x23 h13 y4c ff6 fsc fc0 sc0 lsd ws0">90%</div><div class="t m4 x24 h13 y4d ff6 fsc fc0 sc0 lsd ws0">10%</div><div class="t m4 x25 h13 y4e ff6 fsc fc0 sc0 lsf ws0">Voltage(Vrms)</div><div class="t m4 x26 h13 y4f ff6 fsc fc0 sc0 ls0 ws0">2</div><div class="t m4 x27 h13 y50 ff6 fsc fc0 sc0 ls0 ws0">4</div><div class="t m4 x28 h13 y51 ff6 fsc fc0 sc0 ls0 ws0">6</div><div class="t m4 x29 h13 y52 ff6 fsc fc0 sc0 ls10 ws0">Vth</div><div class="t m4 x2a h13 y53 ff6 fsc fc0 sc0 ls11 ws0">V10</div><div class="t m4 x2b h13 y54 ff6 fsc fc0 sc0 ls10 ws0">V90</div><div class="t m4 x2c h13 y55 ff6 fsc fc0 sc0 ls11 ws0">Von(r<span class="_ _15"></span>ms<span class="_ _15"></span>)</div><div class="t m4 x2d h13 y56 ff6 fsc fc0 sc0 ls12 ws0">Vo<span class="_ _14"></span>ff(<span class="_ _16"> </span>rms)</div><div class="t m0 x2e h14 y57 ff2 fsd fc1 sc0 ls0 ws0"> </div><div class="t m0 x1f h6 y58 ff2 fs2 fc0 sc0 ls0 ws0">图-3 光线的透射率与交流电压的有效值的关系图<span class="fc1"> </span></div><div class="t m0 x9 h6 y59 ff2 fs2 fc0 sc0 ls0 ws0">LCD <span class="_ _6"></span>类单片机内嵌的<span class="_ _5"> </span>LCD <span class="_ _3"></span>driver(液晶驱动器)，正是通过系统的控制，按照用户定</div><div class="t m0 x7 h6 y5a ff2 fs2 fc0 sc0 ls0 ws0">义的显示图案，产生点亮<span class="_ _5"> </span>LCD(Liquid Crystal Display，液晶)所需的模拟驱动波形，</div><div class="t m0 x7 h6 y5b ff2 fs2 fc0 sc0 ls0 ws0">接到<span class="_ _5"> </span>LCD Panel(液晶显示屏)上点亮对应的像素而达到显示的效果。 </div><div class="t m0 x9 h6 y5c ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">占空比(Duty) </span></span></div><div class="t m0 x9 h6 y5d ff2 fs2 fc0 sc0 ls0 ws0">该项参数一般也称为<span class="_ _5"> </span>Duty<span class="_ _5"> </span>数或<span class="_ _5"> </span>COM<span class="_ _5"> </span>数。<span class="_ _6"></span>由于<span class="_ _5"> </span>STN/TN<span class="_ _5"> </span>的<span class="_ _5"> </span>LCD<span class="_ _5"> </span>一般是采用时分动态扫</div><div class="t m0 x9 h6 y5e ff2 fs2 fc0 sc0 ls0 ws0">描的驱动模式，<span class="_ _1"></span>在此模式下，<span class="_ _1"></span>每个<span class="_ _5"> </span>COM<span class="_ _5"> </span>的有效选通时间与整个扫描周期的比值即占</div><div class="t m0 x9 h6 y5f ff2 fs2 fc0 sc0 ls0 ws0">空比(Duty)是固定的，等于<span class="_ _5"> </span>1/COM<span class="_ _5"> </span>数。 </div><div class="t m0 x9 h6 y60 ff5 fs2 fc0 sc0 ls0 ws0"><span class="ff6"> <span class="_ _7"> </span><span class="ff2">偏置(Bias) </span></span></div><div class="t m0 x9 h6 y61 ff2 fs2 fc0 sc0 ls0 ws0">LCD<span class="_ _5"> </span>的<span class="_ _5"> </span>SEG/COM<span class="_ _5"> </span>的驱动波形为模拟信号，而各档模拟电压相对于<span class="_ _5"> </span>LCD<span class="_ _5"> </span>输出的最高电</div><div class="t m0 x9 h6 y62 ff2 fs2 fc0 sc0 ls0 ws0">压的比例称为偏置，<span class="_ _8"></span>而一般来讲，<span class="_ _8"></span>Bias<span class="_ _5"> </span>是以最低一档与输出最高电压的比值来表示，</div><div class="t m0 x9 h6 y63 ff2 fs2 fc0 sc0 ls0 ws0">如图-4<span class="_ _5"> </span>所示(1/4 Duty,1/3 Bias): </div><div class="t m6 x2f h15 y64 ff6 fse fc0 sc0 ls13 ws0">SEGn</div><div class="t m7 x30 h16 y65 ff6 fsf fc0 sc0 ls13 ws0">V3</div><div class="t m8 x31 h17 y66 ff6 fs10 fc0 sc0 ls14 ws7">COM4 - SEGn</div><div class="t m8 x32 h17 y67 ff6 fs10 fc0 sc0 ls14 ws0">SEGn+1</div><div class="t m8 x33 h17 y68 ff6 fs10 fc0 sc0 ls0 ws0">0</div><div class="t m8 x2f h17 y69 ff6 fs10 fc0 sc0 ls15 ws0">COM4</div><div class="t m8 x2f h17 y6a ff6 fs10 fc0 sc0 ls15 ws0">COM3</div><div class="t m8 x2f h17 y6b ff6 fs10 fc0 sc0 ls15 ws0">COM2</div><div class="t m8 x2f h17 y6c ff6 fs10 fc0 sc0 ls15 ws0">COM1</div><div class="t m9 x34 h18 y6d ff6 fs11 fc0 sc0 ls15 ws0">COM4</div><div class="t ma x34 h19 y6e ff6 fs12 fc0 sc0 ls15 ws0">COM3</div><div class="t mb x34 h1a y6f ff6 fs13 fc0 sc0 ls15 ws0">COM2</div><div class="t mc x34 h1b y70 ff6 fs14 fc0 sc0 ls16 ws0">COM1</div><div class="t mc x30 h1b y71 ff6 fs14 fc0 sc0 ls17 ws0">V2</div><div class="t mc x30 h1b y72 ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x30 h1b y73 ff6 fs14 fc0 sc0 ls17 ws0">V3</div><div class="t mc x33 h1b y74 ff6 fs14 fc0 sc0 ls0 ws0">0</div><div class="t mc x30 h1b y75 ff6 fs14 fc0 sc0 ls17 ws0">V2</div><div class="t mc x30 h1b y76 ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x33 h1b y77 ff6 fs14 fc0 sc0 ls17 ws0">V3</div><div class="t mc x35 h1b y78 ff6 fs14 fc0 sc0 ls0 ws0">0</div><div class="t mc x33 h1b y79 ff6 fs14 fc0 sc0 ls17 ws0">V2</div><div class="t mc x33 h1b y7a ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x33 h1b y7b ff6 fs14 fc0 sc0 ls17 ws0">V3</div><div class="t mc x35 h1b y7c ff6 fs14 fc0 sc0 ls0 ws0">0</div><div class="t mc x33 h1b y7d ff6 fs14 fc0 sc0 ls17 ws0">V2</div><div class="t mc x33 h1b y7e ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x33 h1b y7f ff6 fs14 fc0 sc0 ls17 ws0">V3</div><div class="t mc x35 h1b y80 ff6 fs14 fc0 sc0 ls0 ws0">0</div><div class="t mc x33 h1b y81 ff6 fs14 fc0 sc0 ls17 ws0">V2</div><div class="t mc x33 h1b y82 ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x33 h1b y83 ff6 fs14 fc0 sc0 ls0 ws0">V</div><div class="t mc x33 h1b y84 ff6 fs14 fc0 sc0 ls0 ws0">0</div><div class="t mc x30 h1b y85 ff6 fs14 fc0 sc0 ls17 ws0">V2</div><div class="t mc x30 h1b y86 ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x33 h1b y87 ff6 fs14 fc0 sc0 ls17 ws0">V3</div><div class="t mc x36 h1b y88 ff6 fs14 fc0 sc0 ls0 ws0">0</div><div class="t mc x35 h1b y89 ff6 fs14 fc0 sc0 ls0 ws0">V</div><div class="t mc x33 h1b y8a ff6 fs14 fc0 sc0 ls17 ws0">V1</div><div class="t mc x30 h1b y8b ff6 fs14 fc0 sc0 ls18 ws0">-V3</div><div class="t mc x30 h1b y8c ff6 fs14 fc0 sc0 ls18 ws0">-V2</div><div class="t mc x30 h1b y8d ff6 fs14 fc0 sc0 ls18 ws0">-V1</div><div class="t md x37 h1c y8e ff6 fs15 fc0 sc0 ls17 ws0">SEGn+1</div><div class="t md x37 h1c y8f ff6 fs15 fc0 sc0 ls17 ws0">SEGn</div><div class="t me x38 h1d y90 ff6 fs16 fc0 sc0 ls19 ws0">Select</div><div class="t me x39 h1d y91 ff6 fs16 fc0 sc0 ls1a ws0">COMX</div><div class="t me x3a h1d y92 ff6 fs16 fc0 sc0 ls1b ws0">Light</div><div class="t me x39 h1d y93 ff6 fs16 fc0 sc0 ls1c ws0">SEGX</div><div class="t mf x3b h1e y94 ff6 fs17 fc0 sc0 ls1d ws0">Unselect</div><div class="t mf x3c h1e y95 ff6 fs17 fc0 sc0 ls1e ws0">Unlight</div><div class="t m10 x3a h1f y96 ff6 fs18 fc0 sc0 ls1f ws0">Unlight</div><div class="t m11 x3c h20 y97 ff6 fs19 fc0 sc0 ls1e ws0">Unlight</div><div class="t m11 x39 h20 y98 ff6 fs19 fc0 sc0 ls20 ws0">SEGX</div><div class="t m11 x3d h20 y99 ff6 fs19 fc0 sc0 ls21 ws0">V3</div><div class="t m11 x3d h20 y9a ff6 fs19 fc0 sc0 ls21 ws0">V2</div><div class="t m11 x3d h20 y9b ff6 fs19 fc0 sc0 ls21 ws0">V1</div><div class="t m11 x3d h20 y9c ff6 fs19 fc0 sc0 ls0 ws0">0</div><div class="t m11 x3d h20 y9d ff6 fs19 fc0 sc0 ls21 ws0">V3</div><div class="t m11 x3d h20 y9e ff6 fs19 fc0 sc0 ls21 ws0">V2</div><div class="t m11 x3d h20 y9f ff6 fs19 fc0 sc0 ls21 ws0">V1</div><div class="t m11 x3d h20 ya0 ff6 fs19 fc0 sc0 ls0 ws0">0</div><div class="t m11 x3d h20 ya1 ff6 fs19 fc0 sc0 ls21 ws0">V3</div><div class="t m11 x3d h20 ya2 ff6 fs19 fc0 sc0 ls21 ws0">V2</div><div class="t m11 x3d h20 ya3 ff6 fs19 fc0 sc0 ls21 ws0">V1</div><div class="t m11 x3d h20 ya4 ff6 fs19 fc0 sc0 ls0 ws0">0</div><div class="t m11 x39 h20 ya5 ff6 fs19 fc0 sc0 ls20 ws0">Sele<span class="_ _15"></span>ct</div><div class="t m11 x39 h20 ya6 ff6 fs19 fc0 sc0 ls22 ws0">Unse<span class="_ _14"></span>lect</div><div class="t m12 x3e h21 ya7 ff6 fs1a fc0 sc0 ls23 ws0">One</div><div class="t m12 xa h21 ya8 ff6 fs1a fc0 sc0 ls24 ws0">Frame</div><div class="t m13 x3f h22 ya9 ff2 fs1b fc0 sc0 ls0 ws0"> </div><div class="t m13 x40 h22 yaa ff2 fs1b fc0 sc0 ls0 ws0">图-4 LCD driver<span class="_ _5"> </span>驱动波形图 </div><div class="t m13 xc h23 yab ff3 fs1b fc0 sc0 ls25 ws0"> </div><div class="t m13 xc h23 yac ff3 fs1b fc0 sc0 ls9 ws4">T<span class="_ _2"></span>el: (755) 2518-1447 <span class="_ _9"> </span> <span class="_ _a"> </span> </div><div class="t m13 xd h23 yad ff3 fs1b fc0 sc0 ls9 ws8">Fax: <span class="_ _3"></span>(755) <span class="_ _6"></span>2518-1987 <span class="_ _b"> </span><span class="lsa ws0">V1.0<span class="_ _c"></span><span class="ff2 ls0">版本：</span></span></div><div class="t m13 x7 h24 yae ff3 fs1c fc0 sc0 ls0 ws0"> </div></div><div class="pi" data-data='{"ctm":[1.611639,0.000000,0.000000,1.611639,0.000000,0.000000]}'></div></div>