Polarizing–alignment layers for twisted nematic cells
نویسنده
چکیده
We describe polarizing lms formed from the lyotropic liquid crystalline phases of dyes dissolved in water. The dye polarizers possess a high dichroic ratio close to that of conventional polarizers. In addition, the dried dye lms provide a uniform homogeneous orientation for thermotropic nematic materials. Therefore, thin dye lms can simultaneously serve as internal polarizers and as alignment agents. These properties make them especially suitable for twisted nematic devices based on low cost birefringent plastic substrates.
منابع مشابه
Coexisting nematic and smectic-A phases in a twisted liquid-crystal cell.
Twisted homogeneously planar-aligned nematic liquid-crystal cells are cooled into the smectic- A phase. The expected defective structure does not form. Instead the cells still show good optical-guiding characteristics. Exploration of the cells using a half-leaky guided-mode arrangement reveals that the liquid-crystal phase separates into three or more regions. Adjacent to both the upper and low...
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