A method is proposed for fabricating extended porous polymer films for spatially aligning liquid crystals. By means of the successive biaxial extension method, polyolefin porous polymer films are extended to a great degree (10 μm thick, porosity 72.4%). After the porous polymer films are filled with nematic liquid crystals, a liquid crystal cell is fabricated by attaching glass substrates. The extension factor is 2.4 times and 6 times along the two orthogonal directions. As a result of observation by a polarization microscope, it is recognized that the liquid crystal molecules are aligned along the extension direction within the porous film. An optical modulation function using the birefringence of the liquid crystal is observed on application of a voltage. Unlike the conventional rubbing orientation process, the present scheme does not generate any static electricity or fine dust. Further, high-temperature baking of the alignment layer is not necessary. Orientation processing of liquid crystals is possible with the substrate maintained at room temperature.
|Number of pages||8|
|Journal||Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)|
|Publication status||Published - 2004 Apr|
- Liquid crystal orientation
- Orientation anchoring force
- Porous polymer film