Patent ID: 8164714
Filing Date: 2012-04-24
Classification: G02B,G02F,G03B

Abstract:
1. A diffractive display device, comprising: a pair of substrates; first illuminating means for entering light through a side surface of the pair of substrates; second illuminating means for entering light through the side surface of the pair of substrates from a direction different from the light from the first illuminating means; and an optical material layer, provided between the pair of substrates, and having a first portion that diffracts the light from the first illuminating means and emits the light from a substrate surface, and a second portion that diffracts the light from the second illuminating means and emits the light from the substrate surface, wherein the first portion diffracts only the light from the first illuminating means and does not diffract the light from the second illuminating means, and wherein the second portion diffracts only the light from the second illuminating means and does not diffract the light from the first illuminating means.