顯(xian)示(shi)(shi)(shi)屏(ping)(ping)的(de)(de)亮度(du):要在一(yi)個(ge)環(huan)(huan)境(jing)中正確(que)的(de)(de)顯(xian)示(shi)(shi)(shi)信息,要有(you)足夠的(de)(de)亮度(du)以(yi)圖像的(de)(de)實際對比度(du),尤其(qi)是用(yong)在戶外(wai)(wai)環(huan)(huan)境(jing)條件(jian)惡劣(lie)的(de)(de)戶外(wai)(wai)LED顯(xian)示(shi)(shi)(shi)屏(ping)(ping)。所以(yi),根據使用(yong)環(huan)(huan)境(jing)的(de)(de)不同顯(xian)示(shi)(shi)(shi)屏(ping)(ping)要有(you)相應的(de)(de)亮度(du)來。顯(xian)示(shi)(shi)(shi)屏(ping)(ping)投入使用(yong)后,做為發光源的(de)(de)LED管(guan)的(de)(de)亮度(du)就(jiu)開始衰減,所以(yi)亮度(du)衰減的(de)(de)速率是LED顯(xian)示(shi)(shi)(shi)屏(ping)(ping)的(de)(de)重要性能之一(yi)。
場(chang)(chang)(chang)掃描電(dian)(dian)路(lu):包括場(chang)(chang)(chang)振蕩和場(chang)(chang)(chang)輸出(chu)(chu)兩部分。場(chang)(chang)(chang)振蕩電(dian)(dian)路(lu)在同步信號下,形(xing)(xing)成場(chang)(chang)(chang)頻鋸(ju)齒波(bo),鋸(ju)齒波(bo)再由場(chang)(chang)(chang)輸出(chu)(chu)電(dian)(dian)路(lu)功率(lv)放大后(hou)加至場(chang)(chang)(chang)偏轉(zhuan)線(xian)圈,形(xing)(xing)成掃描電(dian)(dian)流,使電(dian)(dian)子(zi)槍發射出(chu)(chu)的電(dian)(dian)子(zi)上下拉開。場(chang)(chang)(chang)幅和場(chang)(chang)(chang)中心調節(jie)的功能也是在場(chang)(chang)(chang)掃描電(dian)(dian)路(lu)中實現的,此外還輸出(chu)(chu)場(chang)(chang)(chang)頻鋸(ju)齒波(bo)到枕(zhen)形(xing)(xing)校(xiao)正電(dian)(dian)路(lu),以(yi)校(xiao)正水平枕(zhen)形(xing)(xing)失(shi)真。
LCD顯(xian)(xian)示(shi)器(qi)(qi)即(ji)液晶(jing)顯(xian)(xian)示(shi)器(qi)(qi)。它(ta)的(de)優點有(you)機身薄、占地(di)小和(he)輻射小。LCD顯(xian)(xian)示(shi)器(qi)(qi)內(nei)部有(you)很多液晶(jing)粒(li)子,它(ta)們(men)有(you)規律地(di)排列成(cheng)(cheng)(cheng)一定的(de)形狀,并且它(ta)們(men)每(mei)一面(mian)的(de)顏(yan)色(se)(se)都不(bu)(bu)同,分為(wei)紅色(se)(se)、綠(lv)色(se)(se)和(he)藍色(se)(se)。這三原色(se)(se)能還原成(cheng)(cheng)(cheng)任(ren)意的(de)其他顏(yan)色(se)(se)。當顯(xian)(xian)示(shi)器(qi)(qi)收到顯(xian)(xian)示(shi)數據(ju)時,會控(kong)制每(mei)個液晶(jing)粒(li)子轉(zhuan)動到不(bu)(bu)同顏(yan)色(se)(se)的(de)面(mian),從而組合成(cheng)(cheng)(cheng)不(bu)(bu)同的(de)顏(yan)色(se)(se)和(he)圖像。也因為(wei)這樣(yang),LCD顯(xian)(xian)示(shi)器(qi)(qi)的(de)缺點有(you)色(se)(se)彩(cai)不(bu)(bu)夠艷和(he)可視角度不(bu)(bu)大等。
LED顯示(shi)器集微電子技(ji)術、計算機(ji)技(ji)術、信息處理(li)技(ji)術于(yu)一(yi)體,以(yi)其(qi)色彩(cai)鮮艷、動態(tai)范圍廣、亮度高、壽命長、工作穩定(ding)可(ke)靠等(deng)優點(dian),成為具優勢的新一(yi)代顯示(shi)設備(bei)。目前,LED顯示(shi)器已廣泛應用(yong)于(yu)大型廣場、體育場館、證券(quan)交易大廳(ting)等(deng)場所,可(ke)以(yi)滿(man)足不同環境的需要(yao)。
一般濕(shi)度保持在30%-80%之(zhi)間,顯(xian)示(shi)(shi)器(qi)(qi)都(dou)能(neng)正常(chang)工(gong)作,但一旦(dan)室內(nei)(nei)濕(shi)度高(gao)于(yu)80%后,顯(xian)示(shi)(shi)器(qi)(qi)內(nei)(nei)部就會(hui)產(chan)(chan)生結露(lu)現象。其內(nei)(nei)部的(de)(de)電(dian)源變壓(ya)器(qi)(qi)和其他線圈(quan)受潮后也易產(chan)(chan)生漏(lou)電(dian),甚至有可能(neng)造成(cheng)連線短路;而顯(xian)示(shi)(shi)器(qi)(qi)的(de)(de)高(gao)壓(ya)部位則極易產(chan)(chan)生放電(dian)現象;機內(nei)(nei)元器(qi)(qi)件(jian)容易生銹、腐蝕,嚴重(zhong)時(shi)(shi)會(hui)使電(dian)路板(ban)發生短路。因此(ci),LCD顯(xian)示(shi)(shi)器(qi)(qi)注意防潮,長時(shi)(shi)間不(bu)用的(de)(de)顯(xian)示(shi)(shi)器(qi)(qi),可以定期通電(dian)工(gong)作一段時(shi)(shi)間,讓顯(xian)示(shi)(shi)器(qi)(qi)工(gong)作時(shi)(shi)產(chan)(chan)生的(de)(de)熱量將(jiang)機內(nei)(nei)的(de)(de)潮氣驅(qu)趕(gan)出去。
花屏(ping)(ping)通常是(shi)由于顯(xian)(xian)示(shi)(shi)(shi)器(qi)不支持主(zhu)機送來的顯(xian)(xian)示(shi)(shi)(shi)模式,往往是(shi)高于顯(xian)(xian)示(shi)(shi)(shi)器(qi)的顯(xian)(xian)示(shi)(shi)(shi)模式,引起(qi)屏(ping)(ping)幕的圖像(xiang)混亂,無法(fa)看清楚屏(ping)(ping)幕上(shang)的圖像(xiang)和文字。如果是(shi)具有模式自(zi)動識別的顯(xian)(xian)示(shi)(shi)(shi)器(qi),有可(ke)能是(shi)黑屏(ping)(ping)狀(zhuang)態(tai),但(dan)這時面板(ban)下方(fang)(fang)指示(shi)(shi)(shi)燈(deng)為綠(lv)色。這時重(zhong)新啟動即(ji)(ji)可(ke)恢復。如果這種方(fang)(fang)法(fa)不行(xing),可(ke)以在(zai)(zai)把顯(xian)(xian)卡驅動程序刪除,然后在(zai)(zai)重(zhong)新安裝(zhuang)顯(xian)(xian)卡驅動即(ji)(ji)可(ke)。還有在(zai)(zai)顯(xian)(xian)卡顯(xian)(xian)存發生故障時會(hui)出現屏(ping)(ping)幕上(shang)固定位(wei)置顯(xian)(xian)示(shi)(shi)(shi)混亂,而其(qi)他地方(fang)(fang)卻顯(xian)(xian)示(shi)(shi)(shi)正常。也有顯(xian)(xian)卡損壞造成花屏(ping)(ping)的。