投影仪原理

投影仪原理（Projectorprinciple）

Projectorsarenowbeingudmoreandmorewidely,but

projectorsarealsoahighlysophisticatedelectronic

instrument,andmanyfriendsmaynotknowtheworkingprinciple

,thebloggerwillgiveyouanoverviewof

theworkprincipleoftheprojector!

Projectorprinciple

Theprojectorconsistsoftwoparts:imagingsystemand

uminationsystemismainlycompodof

gingsystemismainly

compodofprojectionfilm,r

toachieveagoodprojectioneffect,thelightingsystemand

imagingsystemmustberationallyconfiguredtoachievemaximum

illuminationefficiencywhileilluminatingtheimageevenly.

Tothind,projectorusingKohlerilluminationmode(Corawas

inventedattheendofnineteenthCenturytheCarlZeissCompany

engineerstosolvethemicroscopelighting):theprojected

frame(slides,slides)placednearthecondenrinthe

possibleposition;thelightemittingsurfaceasarrangedin

theimagi蝴蝶的谜语 nglens(projectionlens)thepupil(suchasimaging

lensforsinglelen长城历史 s,thepupilinimagingobjectivelens).

Sofar,projectorshavebeenimplementedmainlythroughthree

displaytechnologies,namely,DLPprojectiontechnology,CRT

projectiontechnologyandLCDprojectiontechnology.

Digitalprojector

DLPistheabbreviationofEnglishDigitalLightPorssor,

thofthisnew

projectiontechnologyenabledustorealizedigital

informationdisplayaftercapturing,receivingandstoring

hnologyisanepoch-making

revolutioninthefieldofdisplay,andDLPwillopenanewpage

forvideoprojectiondisplay.

它以DMD（数字micormirror装置）数字微反射器作为光阀成像器件

DLP投影仪的技术关键点如下：首先是数字优势。数字技术的采用，

使图像灰度等级达256-1024级，色彩达2563-10243种，图像噪声消

失，画面质量稳定，精确的数字图像可不断再现，而且历久弥新。其

次是反射优势。反射式DMD器件的应用，使成像器件的总光效率达

60%以上，对比度和亮度的均匀性都非常出色。在DMD块上，每一个

像素的面积为16M16，间隔为1M.根据所用DMD的片数，DLP

投影机清晰度高、画面均匀，色彩锐利，三片机亮度可达2000流明

以上，它抛弃了传统意义上的会聚，可随意变焦，调整十分便利；分

辨率高，不经压缩分辨率可达1024768（有些机型的最新产品的分

辨率已经达到12801024）。

CRT三枪投影仪

是英文CRT阴极射线管的缩写，译作阴极射线管。作为成像器件，它

是实现最早、应用最为广泛的一种显示技术。这种投影仪可把输入信

号源分解成R（红）、G（绿）B（蓝）三个CRT管的荧光屏上，荧光

粉在高压作用下发光系统放大、会聚、在大屏幕上显示出彩色图像。

光学系统与RT管组成投影管，通常所说的三枪投影仪就是由三个投

影管组成的投影仪，由于使用内光源，也叫主动式投影方式。

CRTimagecolordisplaytechnologyismature,rich,restore,

hastheabilitytoadjusttherichgeometrydistortion;butthe

importanttechnicalindexesofimageresolutionandbrightness

ofeachother,directlyaffectthebrightnessoftheCRT

projector,sofar,thebrightnessvalueisalwayshovering

tion,CRTprojectoroperationiscomplex,

especiallyconvergenceadjustmentcumbersome,largebodysize,

onlysuitableforinstallationinthelightoftheenvironment,

relativelyfixedplace,shouldnotmove.

LCDprojector

projectorsaredividedintotwotypes:liquidcrystalpaneland

crystalisbetweenliquid

andsolidmaterial,itlfdoesnotemitlight,thenatureof

theworkisgreatlyaffectedbytemperature,itsoperating

temperatureis-55oC~+jectorusingLCD

photoelectriceffect,angementofliquidcrystal

moleculesundertheelectricfieldchanges,affecttheLCDunit

lighttransmittanceorreflectance,affecttheoptical

propertiesofitfromthemachine,toproduceimageswith

lowingdescribesthe

principlesofthet吃什么护肝 woLCDprojectors.

2柿子的功效与作用 .1LCDlightvalveprojector

ItusCRTtubeandliquidcrystallightvalveasimaging

eproductofCRTprojectorcombinedwithliquid

rtosolvethecontradiction

between公众表达 imageresolutionandbrightness,itusanexternal

lightsource,llight

valveismainlycompodofthreeparts:photoelectric

converter,mirror,lightmodulator,itisacontrollableswitch.

ThelightsignalproducedbytheCRTisirradiatedtothe

photoelectricconverter,andtheopticalsignalisconverted

intoanelectricsignalwhichiscontinuouslychanged;an

externallightsourcegeneratesabeamoflightandisprojected

ontothelightvalve,

Frominsidethemirror,canchangethelightmodulator,optical

properties,followedbypolarizationlightvalve,willfilter

outtheotherdirectionofthelight,andonlyallowitsoptical

gapdirectionoflightpassingthroughthelight,andCRTsignal

phacomposite,farthe

highestresolutionprojectorbrightness,brightnessupto

6000ANSI,LM,resolutionof2500x2000,applicabletothe

environmentallightisstrong,theaudiencemoreoccasions,

suchasultralargescalecommandcenter,confere电饭煲煮饭 ncecenterand

largeentertainmentvenues,butitshighprice,largevolume,

nbrandsare:Hughes,

-JVC,Amproan双胞胎男孩 dsoon.

2.2LCDpanelprojector

Itsimagingdeviceisaliquidcrystalpanel,anditisalso

rceofmetalhalidelampsorUHP

(coldlight),ifthreeLCDboardsaredesignedtohighlightthe

formationofRGBthreebeamthroughaspectroscope,

respectivelythroughtheRGBcolorLCDpanel;signalsource

throughtheanalogdigitalconversion,modulationappliedto

theliquidcrystalpanel,LCDcontrolunitopenedandclod,

soastocontrolthelightpathbybreakingthroughthemirror,

photosynthesis,amplifiedbytheopticallens,thedisplayon

ghthisprojectorhasrealizedthe

digitalmodulationsignal,butthephysicalcharacteristicof

theliquidcrystalitlfhasdecideditsresponcool反义词 speedtobe

slow,astimepass,theperformancehasdeclined.

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