JPH1048754A5 - - Google Patents

Description

[0023]
The transmission screen 10S of these rear projection image display devices uses a flat lens with a special configuration, as described below. That is, as shown in the schematic cross-sectional view of an example in FIG. 3, the flat lens is configured with a transparent substrate 11 and a transparent substrate 41 disposed on the light-incident side (the light-exiting side and the light-incident side in the illustrated example), and a transparent microsphere arrangement layer 14 disposed between the transparent substrates. The transparent microsphere arrangement layer 14 of this flat lens has transparent microspheres 12 arranged in a two-dimensional monolayer configuration, with adjacent transparent microspheres 12 in contact with or adjacent to each other, and a colored layer 13 on the light-incident side that exposes portions of the transparent microspheres 12 to the outside. In this example, an anti-reflection layer 28 is formed on each of the outer surfaces of the screen 10S.

[0033]
The flat lens 10 itself can constitute a transmission screen of a rear projection type image display device, and incident light can be projected onto it in a substantially perpendicular direction, but a Fresnel lens 27 can also be bonded to form an integrated structure.

[0050]
Furthermore, the colored layer is not limited to black, and may have a spectral distribution of red, green, blue, etc. Furthermore, the colored layer may be formed by mixing a plurality of pigments or dyes having different spectral distributions.