Enhanced scattering voltage sensitive encapsulated liquid crysta

Details Enhanced scattering voltage sensitive encapsulated liquid crysta Enhanced scattering voltage sensitive encapsulated liquid crysta

1986-03-19

1989-03-07

Heyman, John S.

350339R, 350345, G02F 113

Patent

active

048100633

ABSTRACT:
Encapsulated liquid crystal material in a support medium illuminated from the viewing side or through a louvered light guide from the back side will appears bright relative to background when in distorted alignment absent an electric field. Incident light on the liquid crystal material is isotropically scattered into the support medium, and using the principle of total internal reflection and possibly also optical interference a relatively large part of the isotropically scattered light is directed back to illuminate the distorted liquid crystal material tending to brighten the same so that light it scatters back to the viewing direction out of the support medium. Original incident light where there is no liquid crystal material, that light which is isotropically scattered toward the back or non-viewing side of the display within a certain cone or solid angle, and that light passing through aligned (field-on) liquid crystal material will tend not to be totally internally reflected; such light will pass through the support medium and may be absorbed by a remote black or colored material.

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