Display element and observation apparatus having the same
First Claim
1. A display element comprising:
- a substrate; and
a display pattern formed on said substrate, said display pattern including a diffraction grating,wherein the width in the direction perpendicular to grating lines of said diffraction grating is selected so as to prevent rediffraction of the light diffracted by said diffraction grating.
1 Assignment
0 Petitions
Accused Products
Abstract
A display element includes a substrate and a display pattern formed on the substrate, the display pattern including a diffraction grating. The width in the direction perpendicular to the grating lines of the diffraction grating of the display pattern is selected so as to prevent re-diffraction of the light diffracted by the one diffraction grating. An observation apparatus includes the afore-said display element, but the display pattern has a first diffraction grating structure and a second diffraction grating structure. An illuminating system and an observation system are added so as to allow for observation of the display pattern. The direction of the grating lines of the first diffraction grating structure differs from that of the grating lines of the second diffraction grating structure, thereby preventing the occurrence of a rainbow-like image.
110 Citations
12 Claims
-
1. A display element comprising:
-
a substrate; and a display pattern formed on said substrate, said display pattern including a diffraction grating, wherein the width in the direction perpendicular to grating lines of said diffraction grating is selected so as to prevent rediffraction of the light diffracted by said diffraction grating. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An observation apparatus comprising:
-
a display element including a substrate and first and second display patterns formed on said substrate, each of said display patterns having diffraction grating structures; an illuminating system, having a pupil, for supplying light to said display element; and an observation system, having a pupil, disposed to allow for observation of the first and second display patterns produced by the light diffracted by said diffraction grating structures, wherein letting in denote the angle of incidence of light with respect to said substrate, D1 the diameter of said pupil of said illuminating system, D0 the diameter of said pupil of said observation system, Li the distance between said substrate and the plane of said pupil of said illuminating system, L0 the distance between said substrate and the plane of said pupil of said observation system, λ
the wavelength of incident light, P the grating period of said diffraction grating structures of said first and second display patterns and n the refractive index of said substrate, the angle θ
made by the grating lines of said diffraction grating structures of said first and second display patterns fulfills the requirement;
##EQU10## - View Dependent Claims (8, 9, 10)
-
-
11. An observation apparatus comprising:
-
a display element including a substrate and first and second display patterns formed on said substrate, each of said display patterns having diffraction grating structures; an illuminating system for supplying light to said display element; and an observation system disposed to allow for observation of the first and second display patterns produced by the light diffracted by said diffraction grating structure, wherein letting i denote the angle of incidence of light with respect to said substrate, λ
the wavelength of incident light, P the grating period of said diffraction grating structures, K the diffraction order of the light diffracted by said diffraction grating structures, and θ
the offset angle from the direction perpendicular to the grating line of one of said diffraction grating structures, the other diffraction grating structures being located outside the angular range of ±
θ
degrees which satisfies ##EQU11## - View Dependent Claims (12)
-
Specification