Rotatable lens transmissive twisting ball display

Details Rotatable lens transmissive twisting ball display Rotatable lens transmissive twisting ball display

1996-12-24

1999-06-29

Font, Frank G.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359298, 359299, 359316, 359321, G02B 2600

Patent

active

059176466

ABSTRACT:
A combination of an optically transmissive dielectric fluid having a first refractive index and an optically anisotropic particle rotatably disposed in the fluid is provided. The particle has at least one optically transmissive region having a second refractive index. The particle provides a first optical modulation characteristic when disposed in the fluid in a first orientation with respect to a flux of optical energy, and further provides a second optical modulation characteristic when disposed in the fluid in a second orientation with respect to a flux of optical energy. The particle has an anisotropy for providing an electrical dipole moment, the electrical dipole moment rendering the particle electrically responsive such that when the particle is rotatably disposed in an electric field while the electrical dipole moment of the particle is provided, the particle tends to rotate to an orientation in which the electrical dipole moment aligns with the field. For example, the disposition of the particle in the fluid can give rise to the electrical dipole moment of the particle. The fluid-particle combination can be used to make a gyricon or rotating-particle display in which each rotatable particle (e.g., spherical ball) in the display acts as a lens.

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