Display medium provided with diffraction structure and light control element

Abstract

A display medium that is able to arbitrarily change the display of recorded optical image information even when viewed from the same field of view, and an image display method that uses that display medium. The display medium includes a diffraction structure section on which optical image information is recorded, a chromic device that controls the reflection and transmission using voltage, and a power supply that is connected to the chromic device.

What is claimed is: 
     
         1 . A display medium comprising:
 a diffraction structure section on which optical image information is recorded;   a chromic device that controls reflection and transmission of light by using a voltage; a power supply that is connected to the chromic device;   an external signal receiver; and,   a processing chip;   wherein the external signal receiver receives a pattern signal when the pattern signal is encrypted.   
     
     
         2 . A display medium comprising:
 a diffraction structure section on which a plurality of optical information is recorded;   a plurality of chromic devices; and   at least one power supply.   
     
     
         3 . The display medium of  claim 1 , further comprising a concealing layer that covers the power supply. 
     
     
         4 . The display medium of  claim 1 , further comprising a printed layer. 
     
     
         5 . A method for displaying optical image information by a display medium, comprising:
 a diffraction structure section on which optical image information is recorded;   a chromic device; and   a power supply that supplies power to the chromic device, wherein the display medium displays the optical image information that has been recorded on the diffraction structure section depending on change of a voltage from the power supply to the chromic device.   
     
     
         6 . A method for displaying optical image information by a display medium, comprising:
 a diffraction structure section on which a plurality of optical image information is recorded;   a plurality of chromic devices; and   at least one power supply that supplies electrical power to the chromic devices, wherein the display medium displays the plurality of optical image information that has been recorded on the diffraction structure section depending on change of a voltage from the power supply to the chromic devices.   
     
     
         7 . An image display method that uses a display medium, comprising:
 a diffraction structure section on which a plurality of optical image information is recorded;   a plurality of patterned chromic devices;   at least one power supply that supplies electrical power to the chromic devices;   an external signal receiver; and   a processing chip, the method comprising the steps of:
 selecting a pattern of the plurality of patterned chromic devices; 
 transmitting a pattern signal for the pattern from outside of the display medium; 
 receiving the pattern signal and transmitting the signal to the processing chip by the external signal receiver; 
 processing the signal and controlling the voltage that is applied from the power supply to the chromic devices by the processing chip; and 
 changing a pattern state according to the applied voltage by the chromic devices. 
   
     
     
         8 . An article to which the display medium of  claim 1  is affixed.