Display method and device using photonic crystal characteristics

A display method using inter-particle distance adjustment, comprising:

• providing a dispersion comprising a solvent and a plurality of particles dispersed in the solvent wherein each of the particles of the plurality of particles are charged with the same polarity wherein when an electrical field is applied to the dispersion, an amount of electrical polarization of at least one of the solvent and the plurality of particles changes;
• applying electrical field to the dispersion so that an amount of electrical polarization of at least one of the solvent and the plurality of particles changes;
• adjusting wavelength of light reflected from the plurality of particles by changing the applied electrical field so that an inter-particle distance of the plurality of particles varies;
• and
• displaying the light of the adjusted wavelength reflected from the plurality of particles.

A display device using inter-particle distance adjustment, comprising:

• a display region including a dispersion comprising a solvent and a plurality of particles dispersed in the solvent and wherein each of the particles of the plurality of particles are charged with the same polarity wherein when an electrical field is applied to the dispersion, an amount of electrical polarization of at least one of the solvent and the plurality of particles changes;
• and
• an electrical field applying unit applying the electrical field to the dispersion so that the amount of electrical polarization of at least one of the solvent and the plurality of particles changes;
• wherein a wavelength of light reflected from the particles is adjusted by changing the applied electrical field through the electrical field applying unit so that an inter-particle distance of the particles varies;
• and
• wherein the light of the adjusted wavelength reflected from the particles is displayed from the display region.