顯(xian)(xian)示(shi)屏(ping)的亮(liang)(liang)度:要(yao)在(zai)一(yi)個環境中正確的顯(xian)(xian)示(shi)信息,要(yao)有(you)足夠的亮(liang)(liang)度以(yi)圖像的實際(ji)對比度,尤其是用在(zai)戶外(wai)環境條件惡劣的戶外(wai)LED顯(xian)(xian)示(shi)屏(ping)。所以(yi),根據(ju)使(shi)用環境的不同(tong)顯(xian)(xian)示(shi)屏(ping)要(yao)有(you)相應(ying)的亮(liang)(liang)度來(lai)。顯(xian)(xian)示(shi)屏(ping)投(tou)入使(shi)用后,做為發(fa)光源的LED管(guan)的亮(liang)(liang)度就開始衰(shuai)減,所以(yi)亮(liang)(liang)度衰(shuai)減的速率是LED顯(xian)(xian)示(shi)屏(ping)的重要(yao)性(xing)能之一(yi)。
場(chang)(chang)(chang)掃(sao)描電(dian)(dian)路(lu)(lu):包括(kuo)場(chang)(chang)(chang)振蕩(dang)和(he)場(chang)(chang)(chang)輸出(chu)兩部分。場(chang)(chang)(chang)振蕩(dang)電(dian)(dian)路(lu)(lu)在同步信號下,形(xing)成場(chang)(chang)(chang)頻鋸(ju)齒(chi)波(bo)(bo)(bo),鋸(ju)齒(chi)波(bo)(bo)(bo)再由(you)場(chang)(chang)(chang)輸出(chu)電(dian)(dian)路(lu)(lu)功(gong)率放(fang)大(da)后加至場(chang)(chang)(chang)偏轉線(xian)圈(quan),形(xing)成掃(sao)描電(dian)(dian)流,使(shi)電(dian)(dian)子槍發(fa)射出(chu)的(de)電(dian)(dian)子上下拉(la)開(kai)。場(chang)(chang)(chang)幅和(he)場(chang)(chang)(chang)中(zhong)心調節的(de)功(gong)能也(ye)是在場(chang)(chang)(chang)掃(sao)描電(dian)(dian)路(lu)(lu)中(zhong)實現(xian)的(de),此外(wai)還輸出(chu)場(chang)(chang)(chang)頻鋸(ju)齒(chi)波(bo)(bo)(bo)到枕(zhen)形(xing)校正電(dian)(dian)路(lu)(lu),以(yi)校正水平枕(zhen)形(xing)失真。
LCD顯(xian)(xian)示(shi)器(qi)(qi)即液(ye)晶顯(xian)(xian)示(shi)器(qi)(qi)。它的優點(dian)有機身薄、占(zhan)地小和輻(fu)射(she)小。LCD顯(xian)(xian)示(shi)器(qi)(qi)內(nei)部有很多液(ye)晶粒(li)子,它們有規(gui)律地排(pai)列成一定的形狀,并(bing)且它們每(mei)一面(mian)的顏(yan)色(se)(se)(se)都(dou)不同,分為紅(hong)色(se)(se)(se)、綠色(se)(se)(se)和藍(lan)色(se)(se)(se)。這(zhe)三原(yuan)色(se)(se)(se)能還原(yuan)成任意的其他顏(yan)色(se)(se)(se)。當顯(xian)(xian)示(shi)器(qi)(qi)收到顯(xian)(xian)示(shi)數據時,會(hui)控制每(mei)個液(ye)晶粒(li)子轉動到不同顏(yan)色(se)(se)(se)的面(mian),從而組合(he)成不同的顏(yan)色(se)(se)(se)和圖像。也因為這(zhe)樣(yang),LCD顯(xian)(xian)示(shi)器(qi)(qi)的缺點(dian)有色(se)(se)(se)彩不夠艷和可視角度不大等。
LED顯(xian)示(shi)器(qi)集(ji)微電子技術、計(ji)算機技術、信息處理技術于(yu)(yu)一體,以(yi)其(qi)色彩鮮艷、動態范圍廣、亮度高(gao)、壽命(ming)長、工作穩定可(ke)靠等(deng)優(you)點,成為具優(you)勢的新一代顯(xian)示(shi)設備(bei)。目前(qian),LED顯(xian)示(shi)器(qi)已廣泛應用于(yu)(yu)大型廣場、體育場館、證(zheng)券(quan)交易大廳等(deng)場所,可(ke)以(yi)滿(man)足不同環境的需要。
一般濕度(du)保(bao)持在30%-80%之間,顯(xian)示(shi)器都能正常工作(zuo),但(dan)一旦室內濕度(du)高(gao)于80%后,顯(xian)示(shi)器內部(bu)就會產生結露現(xian)象。其內部(bu)的(de)(de)電(dian)(dian)源變壓(ya)器和(he)其他線圈受潮(chao)后也易產生漏(lou)電(dian)(dian),甚至有(you)可能造成連線短路;而顯(xian)示(shi)器的(de)(de)高(gao)壓(ya)部(bu)位則(ze)極易產生放電(dian)(dian)現(xian)象;機內元器件(jian)容易生銹、腐蝕(shi),嚴重時(shi)(shi)(shi)會使電(dian)(dian)路板發生短路。因(yin)此,LCD顯(xian)示(shi)器注(zhu)意防潮(chao),長(chang)時(shi)(shi)(shi)間不(bu)用(yong)的(de)(de)顯(xian)示(shi)器,可以(yi)定期通電(dian)(dian)工作(zuo)一段時(shi)(shi)(shi)間,讓顯(xian)示(shi)器工作(zuo)時(shi)(shi)(shi)產生的(de)(de)熱(re)量(liang)將機內的(de)(de)潮(chao)氣驅趕出(chu)去。
花(hua)(hua)屏(ping)通常是(shi)(shi)由于(yu)顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)器不支持主機送(song)來的顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)模(mo)式(shi),往往是(shi)(shi)高(gao)于(yu)顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)器的顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)模(mo)式(shi),引起屏(ping)幕的圖(tu)像混(hun)亂(luan),無法(fa)看清楚屏(ping)幕上的圖(tu)像和文字(zi)。如(ru)果是(shi)(shi)具有(you)模(mo)式(shi)自動(dong)識別的顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)器,有(you)可(ke)能(neng)是(shi)(shi)黑屏(ping)狀態,但這時(shi)面(mian)板下方(fang)指示(shi)(shi)(shi)燈為(wei)綠色(se)。這時(shi)重新(xin)啟動(dong)即(ji)(ji)可(ke)恢復。如(ru)果這種方(fang)法(fa)不行,可(ke)以在把顯(xian)(xian)(xian)(xian)卡(ka)驅(qu)動(dong)程序刪除,然后在重新(xin)安(an)裝顯(xian)(xian)(xian)(xian)卡(ka)驅(qu)動(dong)即(ji)(ji)可(ke)。還有(you)在顯(xian)(xian)(xian)(xian)卡(ka)顯(xian)(xian)(xian)(xian)存發生故障時(shi)會出現(xian)屏(ping)幕上固定位置顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)混(hun)亂(luan),而其他地方(fang)卻顯(xian)(xian)(xian)(xian)示(shi)(shi)(shi)正常。也有(you)顯(xian)(xian)(xian)(xian)卡(ka)損壞造成花(hua)(hua)屏(ping)的。