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自(zi)然(ran)光(guang)自(zi)上(shang)基(ji)板(ban)至(zhi)下(xia)基(ji)板(ban)入(ru)射(she)液(ye)晶(jing)屏(ping)，不(bu)加(jia)電(dian)場(chang)時(shi)光(guang)線(xian)通(tong)過(guo)第(di)一(yi)塊(kuai)偏(pian)振(zhen)片(pian)變(bian)為(wei)平(ping)行(xing)上(shang)基(ji)板(ban)處(chu)液(ye)晶(jing)取(qu)向(xiang)的(de)偏(pian)振(zhen)光(guang)，偏(pian)振(zhen)光(guang)被(bei)液(ye)晶(jing)層(ceng)旋(xuan)光(guang)，轉(zhuan)過(guo)90°後正好與下基板處偏振片的光軸相平行，可以透過，作為顯示器的亮態；加jia電dian場chang時shi液ye晶jing分fen子zi沿yan電dian場chang方fang向xiang豎shu起qi，原yuan來lai的de扭niu曲qu排pai列lie變bian為wei垂chui直zhi平ping行xing排pai列lie，偏pian振zhen光guang與yu垂chui直zhi排pai列lie的de液ye晶jing不bu作zuo用yong，透tou過guo第di一yi塊kuai偏pian振zhen片pian的de偏pian振zhen光guang通tong過guo液ye晶jing層ceng時shi偏pian振zhen麵mian不bu再zai發fa生sheng旋xuan轉zhuan，到dao達da出chu射she端duan的de偏pian振zhen片pian時shi，偏pian光guang軸zhou與yu出chu射she光guang的de偏pian振zhen方fang向xiang垂chui直zhi，光guang被bei截jie止zhi，呈cheng現xian暗an態tai。如ru果guo電dian場chang不bu特te別bie強qiang，液ye晶jing分fen子zi處chu於yu半ban豎shu立li狀zhuang態tai，旋xuan光guang作zuo用yong也ye處chu於yu半ban完wan全quan狀zhuang態tai，則ze會hui有you部bu分fen光guang透tou過guo，呈cheng現xian中zhong間jian灰hui度du。這zhe就jiu是shi液ye晶jing顯xian示shi器qi的de工gong作zuo原yuan理li。
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