Projector curtain
A projection curtain is provided in the present invention. The projection curtain at least comprises a reflective layer and one of a colored layer, a diffusion layer, and a Fresnel lens layer. The Fresnel lens layer is a spherical Fresnel lens layer or an aspherical Fresnel lens layer. The Fresnel lens layer comprises a plurality of annular protrusions protruding from a plane, the plurality of annular protrusions are arranged in circular bands. A cross-sectional shape of each annular protrusion along a cross section perpendicular to the plane is a triangular shape or a multi-step shape or a free surface shape. The width of one side of each cross-sectional shape parallel to the plane gradually changes, and gradual change of the cross-sectional shape and the width thereof determines light gathering characteristics of the spherical Fresnel lens layer or the aspherical Fresnel lens layer. A surface of each annular protrusion has scattered microstructures. The projection curtain provided in the present invention exhibits higher brightness and larger viewing angle than existing projection curtains.
1 . A preparation method for a projection curtain comprising a colored layer, a diffusion layer, a Fresnel lens layer, and a reflective layer sequentially stacked along a thickness direction, or comprising a colored layer, a Fresnel lens layer, and a reflective layer sequentially stacked along a thickness direction, or comprising a diffusion layer, a Fresnel lens layer, and a reflective layer sequentially stacked along a thickness direction, or comprising a Fresnel lens layer, and a reflective layer sequentially stacked along a thickness direction;
wherein the Fresnel lens layer comprises a plurality of annular protrusions protruding from a plane, the plurality of annular protrusions are arranged in circular bands, and a cross-sectional shape of each annular protrusion along a cross section perpendicular to the plane is a triangular shape or a multi-step shape or a free surface shape;
wherein the reflective layer is a metal reflective layer or an alloy reflective layer, the metal reflective layer comprises aluminum, silver, gold, chromium, nickel or copper, and the alloy reflective layer comprises nickel-chromium alloy, aluminum alloy or titanium alloy;
the method comprising:
bonding any two of the diffusion layer, the colored layer and the Fresnel lens layer through an optical clear adhesive (OCA); or
preparing the diffusion layer and the colored layer by coating, and then bonding the diffusion layer and the colored layer to the Fresnel lens layer through the OCA; or
plating the colored layer on one surface of the diffusion layer, and then bonding the opposite surface of the diffusion layer to the Fresnel lens layer through the OCA; or
plating the colored layer on one surface of the diffusion layer, and then bonding the opposite surface of the colored layer to the Fresnel lens layer through the OCA;
wherein the Fresnel lens layer is prepared through a roll-to-roll process, and the roll-to-roll process comprising:
coating an adhesive layer on a substrate, or a film with a certain haze, or the diffusion layer, or the colored layer, and
performing roll-to-roll stamping on the adhesive layer through a Fresnel lens mold, wherein the Fresnel lens mold used in the stamping has random point structures on a surface thereof prepared through a laser direct writing process,
wherein the Fresnel lens layer further comprises a substrate layer arranged at a bottom of the plurality of annular protrusions or a film layer with a certain haze;
wherein a surface of each annular protrusion of the Fresnel lens layer has scattered microstructures; and/or
wherein the reflective layer is prepared by an electroplating, evaporation, sputtering or coating process.