Theprincipleofopticaleigenfunctionisusedintheanalysisofspecklereductioninlaserprojectiondisplay.Whenthemovingdiffuserisusedinthespecklereductionapproach,thespecklecontrastisdecidedbyboththedegreeoffreedom(DOF)oftheprojectorandtheareaofresolvingcelloftheeyesonthescreen.ItcangainhighDOFoftheprojectorbyincreasingthespace-bandwidthproduct,i.e.,adoptingaprojectionlenswithahighnumericalapertureoralargeviewingfield.Theb
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