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偏光(guang)片(pian)(pian)對于大多數人來說可能非常陌生(sheng)。但(dan)是(shi)說到(dao)液(ye)晶(jing)顯示面板，相信大家就了解了。偏光(guang)片(pian)(pian)主要用于電(dian)子(zi)產品顯示面板，例如液(ye)晶(jing)電(dian)視，汽(qi)車，醫療器械儀表(biao)，手機，電(dian)腦等。偏光(guang)片(pian)(pian)主要由(you)離(li)型膜(mo)，壓敏膠，保護膜(mo)，TAC膜，PVA膜等組成。偏(pian)(pian)光片(pian)的作用是(shi)控(kong)制光束的偏(pian)(pian)振(zhen)方(fang)向，將(jiang)全向光線變成單一方(fang)向的偏(pian)(pian)振(zhen)光，偏(pian)(pian)振(zhen)光方(fang)向與偏(pian)(pian)光片(pian)透過軸(zhou)方(fang)向平行，垂直(zhi)于透過軸(zhou)方(fang)向的光被吸收。

1.偏(pian)光片的(de)透(tou)光率要達(da)到多少？

目前，全球偏光片的市場主要(yao)集中在(zai)TFT-LCD面板。隨著LCD和(he)OLED的(de)產(chan)量提升，偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)的(de)需求也不(bu)斷的(de)增加。它(ta)的(de)主要性能(neng)包括(kuo)光(guang)(guang)學(xue)特性，機械(xie)性能(neng)，外光(guang)(guang)性能(neng)等。其中光(guang)(guang)學(xue)性能(neng)又包含(han)偏(pian)(pian)(pian)振度(du)，透(tou)(tou)光(guang)(guang)率(lv)(lv)和(he)色調三大要素(su)。當偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)應用在LCD產(chan)品中時，要求偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)的(de)偏(pian)(pian)(pian)振度(du)和(he)透(tou)(tou)光(guang)(guang)率(lv)(lv)越(yue)(yue)(yue)(yue)高(gao)(gao)越(yue)(yue)(yue)(yue)好(hao)，LCD顯(xian)示效率(lv)(lv)越(yue)(yue)(yue)(yue)高(gao)(gao)，能(neng)耗越(yue)(yue)(yue)(yue)小。但是因為偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)和(he)透(tou)(tou)光(guang)(guang)率(lv)(lv)是相矛盾(dun)的(de)，偏(pian)(pian)(pian)振度(du)越(yue)(yue)(yue)(yue)高(gao)(gao)，透(tou)(tou)光(guang)(guang)率(lv)(lv)越(yue)(yue)(yue)(yue)低。TFT偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)透(tou)(tou)光(guang)(guang)率(lv)(lv)在43%以上，OLED偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian) 43%以上，半透(tou)(tou)射（霧面）偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)透(tou)(tou)光(guang)(guang)率(lv)(lv)在4%-24%。普(pu) 通偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)透(tou)(tou)光(guang)(guang)率(lv)(lv)在41%-44%之間。不(bu)同應用的(de)偏(pian)(pian)(pian)光(guang)(guang)片(pian)(pian)(pian)(pian)，透(tou)(tou)光(guang)(guang)率(lv)(lv)要求不(bu)一(yi)樣。

2.如(ru)何測(ce)試偏光(guang)(guang)片的光(guang)(guang)學性能-透(tou)光(guang)(guang)率？

偏光(guang)(guang)片(pian)必須要在(zai)(zai)可(ke)見光(guang)(guang)范圍(wei)內(nei)透光(guang)(guang)率均勻，否則(ze)出射光(guang)(guang)會有顏色(se)。測試偏光(guang)(guang)片(pian)的光(guang)(guang)學性能(neng)，我們通(tong)常用透光(guang)(guang)率測試儀(yi)測試偏光(guang)(guang)片(pian)在(zai)(zai)380-760nm的(de)可見光波段(duan)范圍的(de)透(tou)過率(lv)。偏光片的(de)透(tou)光率(lv)為偏光片的(de)透(tou)射光強除以原(yuan)始(shi)光強。也有一些行(xing)業(ye)要求測試偏光片在550nm的(de)透(tou)過率(lv)。