Holographic display apparatus

A holographic display apparatus for displaying an interference patter of a holographic diffraction figure which is irradiated with a reproduction light to reproduce a colored stereoscopic image, comprising:

• a plurality of anode electrodes arranged such that each of a plurality of pixels arranged in a matrix is defined by at least one of the anode electrodes, said anode electrodes being excited and induced to change their reflection coefficient when irradiated with electrons, said pixels forming a plurality of pixel sets comprising three adjacent pixels for displaying red, green and blue, said anode electrodes, used for displaying red, green and blue, being prepared to have changes in their reflection coefficient, respectively, when irradiated with electrons, near wavelengths of the reproduction light, corresponding to red, green and blue;
• a plurality of emitter electrodes arranged opposite said anode electrodes, said emitter electrodes selectively emitting electrons to said anode electrodes by field emission;
• a casing for defining an air-tight vacuum space containing said anode and emitter electrodes;
• and
• a drive mechanism for selecting some of said emitter electrodes and causing them to emit electrons, in accordance with an input signal representing an interference pattern to be displayed by said pixels;
• wherein an interference pattern is displayed on the basis of a change in the reflection coefficient of said anode electrodes due to radiation of electrons emitted from said emitter electrodes.