With　the　rapid　development　of　visual　media,　people　prefer　to　pay　more　attention　to　privacy　protection　in　public　situations.　Currently,　most　existing　researches　on　information　security　such　as　cryptography　and　steganography　mainly　concern　transmission　and　yet　little　has　been　done　to　keep　the　information　displayed　on　screens　from　reaching　eyes　of　the　bystanders.　At　the　same　time,　the　reporter　just　stands　in　front　of　the　screen　during　traditional　meetings.　Limited　time,　screen　area　and　report　forms,　which　inevitably　leads　to　limited　information.　As　a　result,　we　design　a　portable　screen　for　assisting　the　reporter　to　present　any　information　in　a　new　form.　In　some　public　occasions,　the　reporter　can　show　private　content　with　important　information　to　authorized　audience　while　the　others　can　not　see　that.　In　this　paper,　we　propose　a　new　Spatial　PsychoVisual　Modulation　(SPVM)　based　solution　to　the　privacy　problem.　This　system　uses　two　synchronized　projectors　with　linear　polarization　filters　and　polarization　glasses,　and　a　camera　with　linear　polarization　filter　the　metallic　screen.　It　can　guarantee　the　system　shows　private　information　synchronously.　We　have　implemented　the　system　and　experimental　results　demonstrate　the　effectiveness　and　robustness　of　the　proposed　information　security　display　system.