Display having diffraction grating pattern

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.

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 .OMEGA. (omega) which changes from .OMEGA..sub.1 to .OMEGA..sub.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).sub.1 and (alpha).sub.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.

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).sub.1, (lambda).sub.2, . . . , (lambda).sub.m, . . . , (lambda).sub.n, and intensities of the light components at respective wavelengths are defined as A.sub.1, A.sub.2, . . . , A.sub.m, . . . , A.sub.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##