Electro-optical Characteristics of Ferroelectric Liquid Crystal Cells with Polyimide Film for Molecular Alignment
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概要
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Molecular aligning methods of ferroelectric liquid crystal cells to be used for electro-optical devices are investigated on the SSFLC cells. An ITO glass is coated with polyimide by dipping method or spinning method for homogeneous alignment. An alisming agent is diluted by a solvent to 0.5, 1, 2 and 4 % on th dipping or changed the imiderized ratio to 50, 80 and 100 % on the spinning. The aligning film on the surface of a glass is formed with the dipping speed of 10 cm/M in the dipping method. In the spinning method, the glass substrates are fixed on the spinner rotated at a speed of 4000 rpm/M and the aligning agent is dropped on the ITO glass substrates. Molecular aligning characteristics are examined by measurements of (Ⅰ) light transmittance with the cell rotation through the cell placed between cross nicols attached to a polarization microscope, (Ⅱ) the capacitance and DC bias voltage (C-V) relation, and (Ⅲ) the light transmittance and DC bias voltage (T-V) relation. Here,the DC bias voltage is changed from -6 to +6 in the three minutes by going and returning. The electric field and the response time characteristics in electro-optical switching are also investigated by applying a square wave-form voltage (500Hz) to the cells under the cross nicols on the polarization microscope. Experimental results showed that the cell with the aligning film of dilution of 0.5% by the dipping method and of 100% imiderized ratio by the spinning method indicated good molecular aligning characteristics compared with other cells on the molecular alignment. The cell with low rate of dilution had good C-V and T-V characteristics compared with the cells of high rate of dilution and low imiderized ratio. The electric field characteristics showed almost similar characteristics except the cell of 4% aligning film. The response time was short on the cell of 100% imiderized ratio by the spinning method.
- 津山工業高等専門学校の論文
- 1999-08-31
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