Monolayer gyricon display

Details Monolayer gyricon display Monolayer gyricon display

1996-09-13

1998-05-19

Ben, Loha

Optical: systems and elements

Optical modulator

Light wave temporal modulation

345107, 427212, G02B 2600

Patent

active

057543321

ABSTRACT:
A gyricon or twisting-ball display having superior reflectance characteristics comparing favorably with those of white paper. The display is based on a material made up of optically anisotropic particles, such as bichromal balls, disposed substantially in a monolayer in a substrate. The particles are closely packed with respect to one another in the monolayer, preferably so that adjacent particle surfaces are as close to one another as possible. A rotatable disposition of each particle is achievable while the particle is thus disposed in the substrate; for example, the particles can already be rotatable in the substrate, or can be rendered rotatable in the substrate by a nondestructive operation performed on the substrate. In particular, the particles can be situated in an elastomer substrate that is expanded by application of a fluid thereto so as to render the particles rotatable therein. A particle, when in its rotatable disposition, is not attached to the substrate. A reflective-mode display apparatus can be constructed from a piece of the material together a mechanism (e.g., addressing electrodes) for facilitating rotation of at least one of the particles. The light reflected from the display is reflected substantially entirely from the monolayer of balls, so that lower layers are not needed. By eliminating the lower layers, the display can be made thinner, which in turn provides further advantages, such as lower drive voltage and better resolution due to better control of fringing fields.

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