Method of filling dynamic scattering liquid crystal devices
AssigneeRCA Corporation
InventorsHerman Abraham Stern, Howard Sorkin, Henry Claude Schindler
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Abstract
A dynamic scattering liquid crystal cell can be filled from a single fill port by evacuating the cell, filling with a solution of an ionic dopant in a volatile solvent, evaporating the solvent and refilling under vacuum with the dynamic scattering liquid crystal composition. Ion hang-up is avoided and only a single volume of the liquid crystal composition is required to fill the cell.
Claims3
A method of filling a dynamic scattering liquid crystal cell comprising a layer of a liquid crystal composition having negative dielectric anisotropy containing an ionic dopant between two electrodes, said cell having a single fill port, which comprises the steps of:
- evacuating said cell,
- immersing said cell in a solution of an ionic dopant in a volatile solvent to fill the cell with said solution,
- evaporating the volatile solvent leaving a film of said dopant on the inside walls of the cell,
- evacuating said cell, and
- immersing said cell in a dynamic scattering liquid crystal composition containing an ionic dopant to fill the cell.
Dependencies are inferred from the claim text.