Patent ID: 6038070
Filing Date: 2000-03-14
Classification: G03B

Abstract:
A permeable image display screen comprising:a lenticular lens sheet including a plurality of semi-cylindrical lens portions and a plurality of non-focusing portions,said semi-cylindrical lens portions being arranged with spaces on a side of an image light emission surface of said lenticular lens sheet and containing diffusion particles for diffusing an image light incident from an image light incidence surface of said lenticular lens sheet, and each of said plurality of non-focusing portions, through which the image light does not pass, being arranged on the side of said image light emission surface and between two adjacent said semi-cylindrical lens portions; anda glossy permeable layer provided on said image light emission surface of said lenticular lens sheet,wherein reflected light of extraneous light incident on said glossy permeable layer includes normally reflected light which travels in a single reflected direction and diffusely reflected light which travels in a plurality of directions, andsaid glossy permeable layer being constructed such that a relation of I.sub.t .gtoreq.1.2.times.I.sub.d is satisfied, where I.sub.t denotes luminous intensity of total reflected light obtained by summing up luminous intensity of the normally reflected light traveling in a fixed direction and luminous intensity of the diffusely reflected light traveling in a plurality of directions, and I.sub.d denotes luminous intensity of the diffusely reflected light traveling in the plurality of directions.