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　　在國內某(mou)知(zhi)名刊物2010年12月(yue)份期刊看到一篇(pian)關(guan)于介(jie)紹液晶(jing)屏邏輯板TFT偏壓電(dian)(dian)路的(de)文(wen)章(zhang)，文(wen)章(zhang)的(de)標題是：“剖析(xi)液晶(jing)屏邏輯板TFT偏壓電(dian)(dian)路”這是一篇(pian)選(xuan)題極(ji)好的(de)文(wen)章(zhang)、目(mu)前液晶(jing)電(dian)(dian)視出現的(de)極(ji)大(da)部分(fen)屏幕故障例如：圖像花屏、彩色失(shi)(shi)真、灰度失(shi)(shi)真、對比度不良、亮度暗(an)淡、圖像灰暗(an)等等故障都與此(ci)電(dian)(dian)路有關(guan)，維(wei)修人(ren)員在維(wei)修此(ci)類故障時往(wang)往(wang)的(de)面對液晶(jing)屏圖像束(shu)手無策(ce)，而介(jie)紹此(ci)電(dian)(dian)路、無疑(yi)對類似故障的(de)分(fen)析(xi)提供(gong)了極(ji)大(da)的(de)幫助，目(mu)前在一般的(de)期刊書籍介(jie)紹分(fen)析(xi)此(ci)電(dian)(dian)路的(de)文(wen)章(zhang)極(ji)少。

　　什(shen)么(me)是(shi)(shi)TFT屏(ping)(ping)偏(pian)壓電(dian)(dian)路？現(xian)代的液晶電(dian)(dian)視都是(shi)(shi)采用TFT屏(ping)(ping)作為(wei)圖像終端顯(xian)示(shi)(shi)屏(ping)(ping)，由(you)于我們現(xian)在的電(dian)(dian)視信號(hao)（包括各種視頻信號(hao)）是(shi)(shi)專(zhuan)門為(wei)CRT顯(xian)示(shi)(shi)而設計(ji)的，液晶屏(ping)(ping)和CRT的顯(xian)示(shi)(shi)成像方式完全不同（CRT是(shi)(shi)掃描成像、液晶屏(ping)(ping)是(shi)(shi)矩陣成像），液晶屏(ping)(ping)要顯(xian)示(shi)(shi)專(zhuan)門為(wei)CRT而設計(ji)的電(dian)(dian)視信號(hao)，就必須對信號(hao)的排列順序、時(shi)間關系(xi)進(jin)行轉換，以(yi)便(bian)液晶屏(ping)(ping)能正確(que)顯(xian)示(shi)(shi)。

　　圖像(xiang)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)轉換(huan)，這是(shi)一個極其復(fu)雜、精確的(de)過(guo)程；先對信(xin)(xin)(xin)號(hao)(hao)(hao)進行存儲(chu)，然后根(gen)據(ju)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)標準及(ji)液(ye)(ye)晶屏的(de)各項參數進行分析(xi)計(ji)(ji)算，根(gen)據(ju)計(ji)(ji)算的(de)結果在按規定從存儲(chu)器中讀取預存的(de)像(xiang)素信(xin)(xin)(xin)號(hao)(hao)(hao)，并(bing)按照計(ji)(ji)算的(de)要求重新(xin)組合排(pai)(pai)列(lie)(lie)讀取的(de)像(xiang)素信(xin)(xin)(xin)號(hao)(hao)(hao)，成為液(ye)(ye)晶屏顯示適應的(de)信(xin)(xin)(xin)號(hao)(hao)(hao)。這個過(guo)程把(ba)信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)時間過(guo)程、排(pai)(pai)列(lie)(lie)順序都進行了重新(xin)的(de)編排(pai)(pai)，并(bing)且要產生(sheng)控制各個電路工作的(de)輔(fu)助信(xin)(xin)(xin)號(hao)(hao)(hao)。重新(xin)編排(pai)(pai)的(de)像(xiang)素信(xin)(xin)(xin)號(hao)(hao)(hao)在輔(fu)助信(xin)(xin)(xin)號(hao)(hao)(hao)的(de)協調下，施加于液(ye)(ye)晶屏正確的(de)重現圖像(xiang)。

　　每一(yi)(yi)(yi)個(ge)液晶(jing)屏都必須有(you)一(yi)(yi)(yi)個(ge)這(zhe)(zhe)樣的(de)(de)(de)(de)(de)轉換(huan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)，這(zhe)(zhe)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)就(jiu)(jiu)是(shi)(shi)我們常說的(de)(de)(de)(de)(de)“時(shi)序控制(zhi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)”或(huo)“T-CON（提康）電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)”，也有(you)稱(cheng)為(wei)(wei)“邏輯(ji)板電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)”的(de)(de)(de)(de)(de)。這(zhe)(zhe)個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)包括(kuo)液晶(jing)屏周邊(bian)的(de)(de)(de)(de)(de)“行、列驅動(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)”構成(cheng)了(le)一(yi)(yi)(yi)個(ge)液晶(jing)屏的(de)(de)(de)(de)(de)驅動(dong)系(xi)(xi)(xi)(xi)統(tong)。也是(shi)(shi)一(yi)(yi)(yi)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)整(zheng)體。這(zhe)(zhe)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)整(zheng)體是(shi)(shi)由(you)時(shi)序電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)、存(cun)儲電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)、移(yi)位(wei)寄存(cun)器、鎖存(cun)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)、D/A變換(huan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)、譯碼(ma)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)、伽馬（Gamma）電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)（灰階電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)）等組成(cheng)，這(zhe)(zhe)些電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)正常工(gong)(gong)作(zuo)也需(xu)要(yao)(yao)各(ge)種不同的(de)(de)(de)(de)(de)工(gong)(gong)作(zuo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，并且還(huan)要(yao)(yao)有(you)一(yi)(yi)(yi)定(ding)的(de)(de)(de)(de)(de)上電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)序關(guan)(guan)系(xi)(xi)(xi)(xi)，不同的(de)(de)(de)(de)(de)屏，不同的(de)(de)(de)(de)(de)供(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。為(wei)(wei)了(le)保證此電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)正常工(gong)(gong)作(zuo)，一(yi)(yi)(yi)般對這(zhe)(zhe)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)驅動(dong)系(xi)(xi)(xi)(xi)統(tong)單(dan)獨(du)的(de)(de)(de)(de)(de)設計了(le)一(yi)(yi)(yi)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源供(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)（這(zhe)(zhe)個(ge)向液晶(jing)屏驅動(dong)系(xi)(xi)(xi)(xi)統(tong)供(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)(de)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源一(yi)(yi)(yi)般就(jiu)(jiu)稱(cheng)為(wei)(wei)：TFT偏壓(ya)(ya)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)）；由(you)整(zheng)機(ji)的(de)(de)(de)(de)(de)主(zhu)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源提供(gong)(gong)(gong)(gong)一(yi)(yi)(yi)個(ge)5V或(huo)12V電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，給這(zhe)(zhe)個(ge)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源供(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，并由(you)CPU控制(zhi)這(zhe)(zhe)個(ge)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源工(gong)(gong)作(zuo)；產生這(zhe)(zhe)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)驅動(dong)系(xi)(xi)(xi)(xi)統(tong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)提供(gong)(gong)(gong)(gong)所需(xu)的(de)(de)(de)(de)(de)各(ge)種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，就(jiu)(jiu)好像我們的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)視(shi)機(ji)是(shi)(shi)一(yi)(yi)(yi)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)系(xi)(xi)(xi)(xi)統(tong)他(ta)有(you)一(yi)(yi)(yi)個(ge)單(dan)獨(du)的(de)(de)(de)(de)(de)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源，DVD機(ji)是(shi)(shi)一(yi)(yi)(yi)個(ge)獨(du)立(li)(li)的(de)(de)(de)(de)(de)系(xi)(xi)(xi)(xi)統(tong)他(ta)也有(you)一(yi)(yi)(yi)個(ge)單(dan)獨(du)的(de)(de)(de)(de)(de)開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源一(yi)(yi)(yi)樣。是(shi)(shi)非常重要(yao)(yao)也是(shi)(shi)故(gu)障率極(ji)高(gao)的(de)(de)(de)(de)(de)部分（開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源都是(shi)(shi)故(gu)障率最(zui)高(gao)的(de)(de)(de)(de)(de)部分，要(yao)(yao)重點考(kao)慮）。圖(tu)1所示(shi)是(shi)(shi)液晶(jing)屏驅動(dong)系(xi)(xi)(xi)(xi)統(tong)框圖(tu)。從圖(tu)中(zhong)(zhong)可以看出，其(qi)中(zhong)(zhong)的(de)(de)(de)(de)(de)“TFT偏壓(ya)(ya)供(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian) 開(kai)(kai)關(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源”就(jiu)(jiu)是(shi)(shi)這(zhe)(zhe)個(ge)獨(du)立(li)(li)系(xi)(xi)(xi)(xi)統(tong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)的(de)(de)(de)(de)(de)供(gong)(gong)(gong)(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源它產生這(zhe)(zhe)個(ge)驅動(dong)系(xi)(xi)(xi)(xi)統(tong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)需(xu)要(yao)(yao)的(de)(de)(de)(de)(de)各(ge)種電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，有(you)VDD、VDA、VGL和(he)VGH電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)供(gong)(gong)(gong)(gong)各(ge)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)(lu)用。