公开(公告)号：US20190302327A1

公开(公告)日：2019-10-03

申请号：US16332035

申请日：2017-08-14

Applicant: TOMOEGAWA CO., LTD.

Inventor： Makoto MURATA ,  Hiroto KATAGIRI

IPC: G02B5/02 ,  F21V8/00 ,  G02F1/1335

Abstract: Provided is a light diffusion film laminate for a reflective display device which is capable of reducing the change in the brightness of the image without reducing the visibility not only from a predetermined observation position (for example, the front direction of the screen), but also from a slightly inclined direction from the predetermined observation position (for example, the front direction of the screen), thereby having excellent display characteristics, and a reflective display device including the light diffusion film laminate.A light diffusion film laminate for a reflective display device has optical diffusibility that changes depending on an incident angle of light, and at least transmitting reflected light occurring when incident light is reflected by a reflective layer. The light diffusion film laminate includes an anisotropic light diffusion layer whose linear transmittance varies depending on the incident angle of the light; and an isotropic light diffusion layer provided on one surface of the anisotropic light diffusion layer, wherein the anisotropic light diffusion layer has a matrix region, and a pillar region composed of a plurality of pillar structures in the anisotropic light diffusion layer, wherein a scattering central axis angle of the anisotropic light diffusion layer is −5° or more and +5° or less with respect to a normal direction of the anisotropic light diffusion layer, and wherein the light diffusion film laminate for the reflective display device includes the anisotropic light diffusion layer and the isotropic light diffusion layer in this order from a viewing side of the reflected light.