顯(xian)(xian)示屏(ping)的(de)(de)亮度:要(yao)(yao)(yao)在一個環(huan)境中正確的(de)(de)顯(xian)(xian)示信息,要(yao)(yao)(yao)有足夠的(de)(de)亮度以(yi)圖像的(de)(de)實際對比度,尤其是用在戶外環(huan)境條件(jian)惡(e)劣的(de)(de)戶外LED顯(xian)(xian)示屏(ping)。所以(yi),根據(ju)使(shi)用環(huan)境的(de)(de)不同(tong)顯(xian)(xian)示屏(ping)要(yao)(yao)(yao)有相應的(de)(de)亮度來。顯(xian)(xian)示屏(ping)投入使(shi)用后,做(zuo)為(wei)發(fa)光源(yuan)的(de)(de)LED管(guan)的(de)(de)亮度就開始衰(shuai)(shuai)減,所以(yi)亮度衰(shuai)(shuai)減的(de)(de)速率是LED顯(xian)(xian)示屏(ping)的(de)(de)重要(yao)(yao)(yao)性能之(zhi)一。
場(chang)(chang)掃描電(dian)路(lu):包括場(chang)(chang)振(zhen)蕩和場(chang)(chang)輸(shu)出(chu)兩(liang)部分。場(chang)(chang)振(zhen)蕩電(dian)路(lu)在同步信號下(xia)(xia),形成場(chang)(chang)頻鋸齒波(bo)(bo),鋸齒波(bo)(bo)再由場(chang)(chang)輸(shu)出(chu)電(dian)路(lu)功率放(fang)大后加至場(chang)(chang)偏(pian)轉線(xian)圈,形成掃描電(dian)流,使電(dian)子槍發射出(chu)的電(dian)子上下(xia)(xia)拉開。場(chang)(chang)幅和場(chang)(chang)中(zhong)(zhong)心調節(jie)的功能也是在場(chang)(chang)掃描電(dian)路(lu)中(zhong)(zhong)實現的,此(ci)外(wai)還輸(shu)出(chu)場(chang)(chang)頻鋸齒波(bo)(bo)到(dao)枕(zhen)形校正電(dian)路(lu),以校正水平枕(zhen)形失真。
LCD顯(xian)(xian)示(shi)(shi)器(qi)(qi)即液(ye)晶顯(xian)(xian)示(shi)(shi)器(qi)(qi)。它的(de)優點(dian)有(you)(you)機身薄、占(zhan)地(di)小和(he)輻射小。LCD顯(xian)(xian)示(shi)(shi)器(qi)(qi)內(nei)部有(you)(you)很多液(ye)晶粒(li)子,它們有(you)(you)規律地(di)排(pai)列成一定的(de)形狀,并且它們每(mei)一面(mian)的(de)顏(yan)色(se)(se)都(dou)不(bu)(bu)同(tong),分為(wei)紅(hong)色(se)(se)、綠(lv)色(se)(se)和(he)藍色(se)(se)。這三原色(se)(se)能(neng)還原成任意的(de)其(qi)他顏(yan)色(se)(se)。當顯(xian)(xian)示(shi)(shi)器(qi)(qi)收(shou)到(dao)(dao)顯(xian)(xian)示(shi)(shi)數據時(shi),會(hui)控制每(mei)個液(ye)晶粒(li)子轉動(dong)到(dao)(dao)不(bu)(bu)同(tong)顏(yan)色(se)(se)的(de)面(mian),從而(er)組合(he)成不(bu)(bu)同(tong)的(de)顏(yan)色(se)(se)和(he)圖像。也因為(wei)這樣,LCD顯(xian)(xian)示(shi)(shi)器(qi)(qi)的(de)缺點(dian)有(you)(you)色(se)(se)彩不(bu)(bu)夠艷(yan)和(he)可視角度不(bu)(bu)大等。
LED顯(xian)示(shi)器集微電子技(ji)術、計算機技(ji)術、信息處理技(ji)術于一體,以其色彩鮮艷、動態范(fan)圍廣、亮度高、壽(shou)命(ming)長、工作穩定(ding)可靠等優點,成(cheng)為具優勢的新一代(dai)顯(xian)示(shi)設備。目前,LED顯(xian)示(shi)器已廣泛應用(yong)于大型廣場、體育(yu)場館、證券交易大廳等場所,可以滿(man)足(zu)不同環境的需(xu)要。
一般濕度保(bao)持在30%-80%之間(jian)(jian),顯(xian)示(shi)(shi)器(qi)(qi)都能(neng)正常工(gong)作(zuo),但一旦室內(nei)濕度高于(yu)80%后,顯(xian)示(shi)(shi)器(qi)(qi)內(nei)部就會產(chan)生(sheng)(sheng)(sheng)結(jie)露現象。其(qi)(qi)內(nei)部的(de)(de)(de)電(dian)源變壓(ya)器(qi)(qi)和其(qi)(qi)他線圈受潮后也(ye)易產(chan)生(sheng)(sheng)(sheng)漏電(dian),甚至有可(ke)能(neng)造成連線短路;而顯(xian)示(shi)(shi)器(qi)(qi)的(de)(de)(de)高壓(ya)部位則極易產(chan)生(sheng)(sheng)(sheng)放電(dian)現象;機內(nei)元器(qi)(qi)件容易生(sheng)(sheng)(sheng)銹、腐蝕,嚴重時(shi)會使(shi)電(dian)路板發生(sheng)(sheng)(sheng)短路。因此(ci),LCD顯(xian)示(shi)(shi)器(qi)(qi)注意防潮,長時(shi)間(jian)(jian)不(bu)用的(de)(de)(de)顯(xian)示(shi)(shi)器(qi)(qi),可(ke)以定期通電(dian)工(gong)作(zuo)一段時(shi)間(jian)(jian),讓(rang)顯(xian)示(shi)(shi)器(qi)(qi)工(gong)作(zuo)時(shi)產(chan)生(sheng)(sheng)(sheng)的(de)(de)(de)熱量將機內(nei)的(de)(de)(de)潮氣(qi)驅趕出去(qu)。
花(hua)屏通常是(shi)由于顯(xian)(xian)示(shi)(shi)器(qi)不支(zhi)持主機(ji)送來的(de)顯(xian)(xian)示(shi)(shi)模式,往往是(shi)高于顯(xian)(xian)示(shi)(shi)器(qi)的(de)顯(xian)(xian)示(shi)(shi)模式,引起屏幕的(de)圖像混亂,無法(fa)看清(qing)楚屏幕上的(de)圖像和文(wen)字。如(ru)果是(shi)具有(you)模式自動(dong)識別(bie)的(de)顯(xian)(xian)示(shi)(shi)器(qi),有(you)可(ke)(ke)能(neng)是(shi)黑屏狀態(tai),但這時面板下方(fang)指示(shi)(shi)燈為綠色(se)。這時重新(xin)啟動(dong)即(ji)可(ke)(ke)恢復。如(ru)果這種方(fang)法(fa)不行,可(ke)(ke)以在把顯(xian)(xian)卡(ka)驅動(dong)程序刪除,然(ran)后(hou)在重新(xin)安裝顯(xian)(xian)卡(ka)驅動(dong)即(ji)可(ke)(ke)。還有(you)在顯(xian)(xian)卡(ka)顯(xian)(xian)存(cun)發生故障時會出現屏幕上固定(ding)位置顯(xian)(xian)示(shi)(shi)混亂,而其他地(di)方(fang)卻顯(xian)(xian)示(shi)(shi)正常。也有(you)顯(xian)(xian)卡(ka)損壞(huai)造成花(hua)屏的(de)。