Display having diffraction grating pattern

Claim 2

A display having a diffraction grating pattern, comprising: (a) a flat substrate; (b) at least one dot formed on a surface of said flat substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; and (c) light-shielding means having a predetermined shape and arranged on an illumination light incident side of the diffraction gratings.

Claim 3

A display according to claim 1, wherein said light-shielding means is obtained using a printing ink.

Claim 4

A display according to claim 1, wherein said light-shielding means is obtained using a spatial modulation element.

Claim 5

A display having a diffraction grating pattern, comprising: (a) a flat substrate; (b) at least one dot formed on a surface of said flat substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; and (c) light-shielding means having a predetermined pattern and arranged on a diffracted light emerging side of the diffraction gratings.

Claim 6

A display having a diffraction grating pattern, comprising: (a) a flat substrate; (b) at least one dot formed on a surface of said flat substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; and (c) light-shielding means having a predetermined pattern and arranged on a diffracted light emerging side of the diffraction gratings.

Claim 7

A display according to claim 4, wherein said light-shielding means is obtained using a printing ink.

Claim 8

A display according to claim 4, wherein said light-shielding means is obtained using a spatial modulation element.

Claim 9

A display having a diffraction grating pattern, comprising: (a) a flat substrate; and (b) at least one dot formed on a surface of said substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; wherein said curve has a gradient Ω (omega) which changes from Ω 1 to Ω 2 at the extreme left and right portions of the dot and having a pitch d wherein the curve is translated to obtain the plurality of curves with the following conditions satisfied: tan ((omega).sub.1)=sin ((alpha).sub.1)/sin ((theta)) tan ((omega).sub.2)=sin ((alpha).sub.2)/sin ((theta)) d=(lambda)/sin ((theta)) where (theta)is an incident angle of illumination light, (alpha) 1 and (alpha) 2 are angles (directs of first-order diffracted light) from which the diffraction grating is observed, and (lambda) is a wavelength of the first-order diffracted light.

Claim 10

A display having a diffraction grating pattern, comprising: (a) a flat substrate; and (b) at least one dot formed on a surface of said substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; wherein said curve has a gradient Ω (omega) which changes from Ω 1 to Ω 2 at the extreme left and right portions of the dot and having a pitch d wherein the curve is translated to obtain the plurality of curves with the following conditions satisfied: tan ((omega).sub.1)=sin ((alpha).sub.1)/sin ((theta)) tan ((omega).sub.2)=sin ((alpha).sub.2)/sin ((theta)) d=(lambda)/sin ((theta)) where (theta)is an incident angle of illumination light, (alpha) 1 and (alpha) 2 are angles (directs of first-order diffracted light) from which the diffraction grating is observed, and (lambda) is a wavelength of the first-order diffracted light.

Claim 11

A display according to claim 7, wherein the dot has a region in which no diffraction grating is present.

Claim 12

A display according to claim 7, wherein the dot has a region in which no diffraction grating is present, and the region in which no diffraction grating is present is divided by a line parallel to a translation direction of the curve of the diffraction grating.

Claim 13

A display having a diffraction grating pattern, comprising: (a) a flat substrate; and (b) at least one dot formed on a surface of said substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; wherein the dot is constituted by an aggregate of a plurality of curves obtained by translating a curve at arbitrary pitches, if wavelengths of diffracted light components are defined as (lambda) 1 , (lambda) 2 , . . . , (lambda) m , . . . , (lambda) n , and intensities of the light components at respective wavelengths are defined as A 1 , A 2 , . . . , A m , . . . , A n , spatial frequencies (reciprocals of the pitches) of the diffraction gratings required to diffract the light components having the respective wavelengths are defined as follows: f.sub.1 =sin(theta)/(lambda).sub.1 f.sub.2 =sin(theta)/(lambda).sub.2 f.sub.m =sin(theta)/(lambda).sub.m f.sub.n =sin(theta)/(lambda).sub.n and a delta function is defined as (delta)(X), a spatial frequency distribution of F(fx) represented by the following equation is given to the diffraction gratings, and a function obtained by transforming F(fx) in accordance with an inverse Fourier transform is defined as f(x), and the curve is translated to have an f(x) distribution in a translation direction: ##EQU4##

Claim 14

A display having a diffraction grating pattern, comprising: (a) a flat substrate; and (b) at least one dot formed on a surface of said substrate, the dot being formed by a diffraction grating pattern as an aggregate of a plurality of curves obtained by translating a curve; wherein the dot is constituted by an aggregate of a plurality of curves obtained by translating a curve at arbitrary pitches, if wavelengths of diffracted light components are defined as (lambda) 1 , (lambda) 2 , . . . , (lambda) m , . . . , (lambda) n , and intensities of the light components at respective wavelengths are defined as A 1 , A 2 , . . . , A m , . . . , A n , spatial frequencies (reciprocals of the pitches) of the diffraction gratings required to diffract the light components having the respective wavelengths are defined as follows: f.sub.1 =sin(theta)/(lambda).sub.1 f.sub.2 =sin(theta)/(lambda).sub.2 f.sub.m =sin(theta)/(lambda).sub.m f.sub.n =sin(theta)/(lambda).sub.n and a delta function is defined as (delta)(X), a spatial frequency distribution of F(fx) represented by the following equation is given to the diffraction gratings, and a function obtained by transforming F(fx) in accordance with an inverse Fourier transform is defined as f(x), and the curve is translated to have an f(x) distribution in a translation direction: ##EQU4##

Claim 15

A display according to claim 10, wherein the dot has a region in which no diffraction grating is present.

Claim 16

A display according to claim 10, wherein the dot has a region in which no diffraction grating is present, and the region in which no diffraction grating is present is divided by a line parallel to a translation direction of the curve of the diffraction grating.