顯(xian)示(shi)屏的(de)(de)亮度:要(yao)在一(yi)個環(huan)境中正(zheng)確(que)的(de)(de)顯(xian)示(shi)信(xin)息,要(yao)有足(zu)夠(gou)的(de)(de)亮度以(yi)圖像的(de)(de)實際對比度,尤其是(shi)用在戶外環(huan)境條件惡劣(lie)的(de)(de)戶外LED顯(xian)示(shi)屏。所以(yi),根據使(shi)用環(huan)境的(de)(de)不同(tong)顯(xian)示(shi)屏要(yao)有相應的(de)(de)亮度來。顯(xian)示(shi)屏投入使(shi)用后,做為(wei)發光源的(de)(de)LED管的(de)(de)亮度就開始衰減,所以(yi)亮度衰減的(de)(de)速率是(shi)LED顯(xian)示(shi)屏的(de)(de)重要(yao)性能之一(yi)。
場(chang)(chang)掃描(miao)電(dian)路(lu)(lu):包括場(chang)(chang)振蕩和(he)場(chang)(chang)輸(shu)出兩部分(fen)。場(chang)(chang)振蕩電(dian)路(lu)(lu)在同步信號下,形(xing)成(cheng)場(chang)(chang)頻鋸齒(chi)(chi)波(bo),鋸齒(chi)(chi)波(bo)再由場(chang)(chang)輸(shu)出電(dian)路(lu)(lu)功率放大后加至場(chang)(chang)偏轉線圈,形(xing)成(cheng)掃描(miao)電(dian)流,使(shi)電(dian)子槍發射出的(de)電(dian)子上下拉開。場(chang)(chang)幅和(he)場(chang)(chang)中心(xin)調(diao)節的(de)功能也是在場(chang)(chang)掃描(miao)電(dian)路(lu)(lu)中實現(xian)的(de),此外還輸(shu)出場(chang)(chang)頻鋸齒(chi)(chi)波(bo)到(dao)枕形(xing)校正電(dian)路(lu)(lu),以校正水(shui)平(ping)枕形(xing)失真。
LCD顯(xian)(xian)(xian)示(shi)器(qi)即液(ye)晶顯(xian)(xian)(xian)示(shi)器(qi)。它(ta)(ta)的(de)優點有機身(shen)薄、占地小和輻射小。LCD顯(xian)(xian)(xian)示(shi)器(qi)內部有很多液(ye)晶粒子,它(ta)(ta)們有規(gui)律地排列成(cheng)(cheng)一定的(de)形狀(zhuang),并且它(ta)(ta)們每一面的(de)顏色(se)都不(bu)同(tong),分為紅色(se)、綠色(se)和藍色(se)。這三(san)原(yuan)色(se)能還原(yuan)成(cheng)(cheng)任意的(de)其他顏色(se)。當顯(xian)(xian)(xian)示(shi)器(qi)收到(dao)顯(xian)(xian)(xian)示(shi)數據時,會控(kong)制每個液(ye)晶粒子轉動(dong)到(dao)不(bu)同(tong)顏色(se)的(de)面,從而組合(he)成(cheng)(cheng)不(bu)同(tong)的(de)顏色(se)和圖像(xiang)。也因為這樣,LCD顯(xian)(xian)(xian)示(shi)器(qi)的(de)缺點有色(se)彩不(bu)夠艷(yan)和可視角(jiao)度不(bu)大等。
LED顯(xian)示(shi)(shi)器(qi)集微電子技術(shu)、計算機(ji)技術(shu)、信息處理技術(shu)于一(yi)(yi)體,以其(qi)色彩鮮艷(yan)、動(dong)態范圍(wei)廣、亮度(du)高、壽命長(chang)、工作穩定可靠等優點,成為具優勢的新一(yi)(yi)代(dai)顯(xian)示(shi)(shi)設備。目前,LED顯(xian)示(shi)(shi)器(qi)已廣泛應用于大(da)型廣場(chang)、體育場(chang)館(guan)、證券交易大(da)廳等場(chang)所,可以滿足不同環境的需要。
一(yi)般濕(shi)度(du)保(bao)持(chi)在(zai)30%-80%之間,顯(xian)(xian)示(shi)器(qi)都能(neng)正(zheng)常工(gong)作,但一(yi)旦室內濕(shi)度(du)高(gao)于80%后,顯(xian)(xian)示(shi)器(qi)內部(bu)就會(hui)產(chan)生結露現(xian)象。其(qi)內部(bu)的電(dian)(dian)源(yuan)變壓器(qi)和其(qi)他(ta)線(xian)圈受(shou)潮后也(ye)易產(chan)生漏電(dian)(dian),甚至(zhi)有(you)可能(neng)造成(cheng)連線(xian)短路(lu);而顯(xian)(xian)示(shi)器(qi)的高(gao)壓部(bu)位則(ze)極易產(chan)生放電(dian)(dian)現(xian)象;機內元器(qi)件容易生銹、腐蝕(shi),嚴重時(shi)會(hui)使電(dian)(dian)路(lu)板發生短路(lu)。因此,LCD顯(xian)(xian)示(shi)器(qi)注意防潮,長時(shi)間不用的顯(xian)(xian)示(shi)器(qi),可以定(ding)期通電(dian)(dian)工(gong)作一(yi)段時(shi)間,讓顯(xian)(xian)示(shi)器(qi)工(gong)作時(shi)產(chan)生的熱(re)量將機內的潮氣驅趕出去。
花屏(ping)通(tong)常是由于顯(xian)(xian)(xian)(xian)(xian)示(shi)器不(bu)支持(chi)主機送來的顯(xian)(xian)(xian)(xian)(xian)示(shi)模(mo)式,往往是高于顯(xian)(xian)(xian)(xian)(xian)示(shi)器的顯(xian)(xian)(xian)(xian)(xian)示(shi)模(mo)式,引起(qi)屏(ping)幕(mu)(mu)的圖像混(hun)亂,無法看(kan)清楚屏(ping)幕(mu)(mu)上的圖像和(he)文字(zi)。如(ru)(ru)果是具有模(mo)式自動識(shi)別的顯(xian)(xian)(xian)(xian)(xian)示(shi)器,有可能(neng)是黑屏(ping)狀態,但這時面板(ban)下方(fang)指(zhi)示(shi)燈(deng)為綠色。這時重(zhong)新啟動即可恢(hui)復。如(ru)(ru)果這種方(fang)法不(bu)行,可以在把顯(xian)(xian)(xian)(xian)(xian)卡驅(qu)動程序刪除,然后(hou)在重(zhong)新安裝顯(xian)(xian)(xian)(xian)(xian)卡驅(qu)動即可。還有在顯(xian)(xian)(xian)(xian)(xian)卡顯(xian)(xian)(xian)(xian)(xian)存發生故(gu)障(zhang)時會出現屏(ping)幕(mu)(mu)上固定位(wei)置顯(xian)(xian)(xian)(xian)(xian)示(shi)混(hun)亂,而其(qi)他(ta)地方(fang)卻顯(xian)(xian)(xian)(xian)(xian)示(shi)正常。也有顯(xian)(xian)(xian)(xian)(xian)卡損壞造成(cheng)花屏(ping)的。