電視廣播系統的終端設備。簡稱電視機。電視機將天線接收(shou)到(dao)的高(gao)頻電(dian)視(shi)信號(hao)還原為視(shi)頻圖像(xiang)信號(hao)和低(di)頻伴音信號(hao),分(fen)別加(jia)給顯(xian)示(shi)器件和揚聲器,重(zhong)現圖像(xiang)和重(zhong)放聲音。電(dian)視(shi)機的分(fen)類方法很多。依顯(xian)示(shi)圖像的顏色,分為(wei)黑白電(dian)視(shi)機(ji)(ji)和(he)(he)彩(cai)色電(dian)視(shi)機(ji)(ji);依信號處理方式,分為(wei)模擬(ni)電(dian)視(shi)機(ji)(ji)和(he)(he)數字電(dian)視(shi)機(ji)(ji);依顯(xian)示器件,分為(wei)顯(xian)像管電(dian)視(shi)機(ji)(ji)和(he)(he)固體顯(xian)示(液晶顯(xian)示、等離子體顯示(shi))電(dian)(dian)視(shi)(shi)機(ji)(ji);依(yi)電(dian)(dian)路(lu)器件,分為電(dian)(dian)子管電(dian)(dian)視(shi)(shi)機(ji)(ji)、晶體管電(dian)(dian)視(shi)(shi)機(ji)(ji)、集成(cheng)電(dian)(dian)路(lu)電(dian)(dian)視(shi)(shi)機(ji)(ji);依(yi)接(jie)收(shou)聲(sheng)(sheng)道(dao),分為單聲(sheng)(sheng)道(dao)電(dian)(dian)視(shi)(shi)機(ji)(ji)、立(li)體聲(sheng)(sheng)電(dian)(dian)視(shi)(shi)機(ji)(ji)等。此外,還(huan)有立(li)體(ti)電(dian)視(shi)機(ji)、多畫面電(dian)視(shi)機(ji)、多功能電(dian)視(shi)機(ji)等。家庭(ting)中用的電(dian)視(shi)機(ji)主要是黑白(bai)電(dian)視(shi)機(ji)和彩(cai)色(se)電(dian)視(shi)機(ji)。黑白(bai)電(dian)視(shi)機(ji)用來接收(shou)電(dian)視(shi)臺播送的黑白(bai)電(dian)視(shi)節(jie)目,也可以(yi)用來接收兼容(rong)制彩色電視節目(mu),但只能重現黑白圖像和伴音。它主要由(you)高頻頭、圖像通(tong)道(dao)、伴音通(tong)道(dao)和掃(sao)描部分組成。
LED電視是電視的未來發展趨勢,嚴格意義上的LED電視(shi)是指完全采用LED(發光二極管)做為顯像器件的電視(shi)機,一般用于低精度顯示或戶外大屏(ping)幕(mu)。目前中(zhong)國大陸(lu)地區(qu)家電行業中(zhong)通(tong)常所指的LED電視嚴格的(de)名稱是(shi)“LED背光(guang)源液(ye)晶(jing)電視”,是(shi)指以LED做為背光(guang)源的(de)液(ye)晶(jing)電視,仍是(shi)LCD的(de)一種。它用LED光(guang)源替代(dai)了傳統的(de)熒光(guang)燈管,畫面更(geng)優質(zhi),理論壽命更(geng)(geng)長(chang),制作工藝(yi)更(geng)(geng)環(huan)保,并且(qie)能使(shi)液晶顯示面(mian)板更(geng)(geng)薄。