PROBLEM TO BE SOLVED: To provide a transmission type screen for an interactive board which can reduce a bright line and the like while having a high front brightness and a proper viewing angle, and can display an excellent image, and to provide an interactive board and an interactive board system which are provided with the same.SOLUTION: A screen 10 for an interactive board 50 includes a prism layer 11, a light diffusion layer 12 provided on an emission side with respect to the prism layer 11, and a substrate layer 13 provided on the emission side with respect to the prism layer 11. The light diffusion layer 12 contains a first diffusion material and a second diffusion material which are two types of diffusion materials having different diffusion characteristics, the first diffusion material has a larger refractive index difference between the first diffusion material and a base material of the light diffusion layer 12 than a refractive index difference between the second diffusion material and the base material of the light diffusion layer, and has a larger diffusion action than that of the second diffusion material, and the sum of the surface area of the second diffusion material existing per unit area when the light diffusion layer 12 is viewed in a normal direction of a screen surface is twice or more of the unit area.

Transmission type screen for interactive board, interactive board, and interactive board system

Curved bezel-concealing display covers and display devices are dis closed. In one embodiment, a bezel-concealing display cover (16) for coupling to a display device having a bezel (14) and a display panel (12) includes a curved perimeter portion having a first surface and a second surface, wherein the curved perimeter portion is configured to be offset from the bezel of the display device by a varying gap GA. The bezel-concealing display cover further includes an array of prisms (22) on at least one of the first surface or the second surface of the curved perimeter portion. The array of prisms extends from an edge of the curved perimeter portion to a distance L. The array of prisms and the curved perimeter portion is configured to shift a portion of an image proximate the bezel produced by the display panel such that the shifted portion of the image appears over the bezel to an observer (0).

Curved bezel-concealing display device covers and bezel-free display devices

The Fresnel lens sheet according to the present invention has a plurality of prismatic Fresnel lens elements including a Fresnel facet, a riser facet, and a top facet crossing the facet and the riser facet on an entrance surface. An angle of the top facet of each Fresnel lens element constituting the lens relative to the an exit surface, δ1, is determined so that an exit angle of the light that has entered each of the top facets and exits from the exit surface, β, is greater than 35 degrees.

Fresnel lens sheet, light-transmission screen, and projection image display apparatus

PROBLEM TO BE SOLVED: To provide a screen used as a display of a small-sized display device having a touch panel function, and a small-sized display device having a touch panel function, reducing double imagesSOLUTION: According to one embodiment, the screen 1 used as a display of the small-sized display device having a touch panel function includes: a Fresnel lens sheet 2 having a Fresnel lens part 22 that converts video light projected from a video light source into substantially parallel light going substantially in the direction of the normal of the screen surface 1a and emits the video light; and an optical control sheet 4 disposed on the side of the Fresnel lens sheet 2 from which the video light is emitted The optical control sheet 4 includes: a plurality of unit light transmitting parts constituting a part of the video light emitting surface of the optical control sheet 4 and extending in the lateral direction of the screen 1; and a plurality of unit light absorbing parts, which are disposed alternately with the unit light transmitting parts, constitute a part of the video light emitting surface of the optical control sheet 4 and extend in the lateral direction of the screen 1

Screen used as display of small-sized display device having touch panel function and small-sized display device having touch panel function, including the same

A Fresnel lens (5) is provided. The Fresnel lens (5) includes a plurality of prisms (7) arrayed on an incident surface side thereof, the prisms refracting light incident on a refractive surface (7a), and reflecting the light refracted thereon on the reflective surface (7b) to be directed to an exit surface side (7c), in which at least a part of the Fresnel lens (5) includes a space-adjusting surface (7d) provided to separate base portions of the refractive surface (7a) and the reflective surface (7b) between adjacent prisms.

Fresnel lens, prism array, rear projection display apparatus, and illuminating apparatus

Each of a plurality of Fresnel prisms 12 is formed so that a refractive surface 12 thereof includes a non-light incidence surface 12 c upon which any light ray emitted from a projector 1 is not directly incident because it is intercepted by another Fresnel prism 12, the non-light incidence surface having an angle τ′ with a reflective surface 12 b which is different from the prism apex angle τ of each of the plurality of Fresnel prisms. As a result, a light ray reflected by the refractive surface 12 a of each of the plurality of Fresnel prisms without passing through the refractive surface can be preventing from emerging, as unnecessary light, toward the viewer's line of sight.

Takao Endo

Papers

Fresnel optical element and projection display device