| 摘要 |
PROBLEM TO BE SOLVED: To decrease the amt. at which the solvents remaining in liquid crystal oriented films elute into liquid crystals, to improve a voltage holding rate and to prevent the occurrence of defects, such as display unevenness, by specifying the film thicknesses of the oriented films to a specific range. SOLUTION: The film thicknesses of the liquid crystal oriented films 15, 16 formed by applying polyimide high-polymer materials on substrates 1, 2 and subjecting the formed films to heat treatments, then to rubbing treatments is specified to 13 to 20nm. Even if the liquid crystal oriented films 15, 16 are formed thicker than 20mm, the ability to orient the liquid crystals does not change. If the oriented films are formed thinner than 13mm, the polyimide molecule oriented layers are made correspondingly thinner and, thereafter, the ability to orient the liquid crystals degrades. The thicknesses of the liquid crystal oriented films 15, 16 is, therefore, set adequately at 13 to 20nm. Then, the elution rate of the solvents into the liquid crystals is lowered and the occurrence of the display defect arising from the degradation in the voltage holding rate by contamination with impurities is prevented by forming the liquid crystal oriented films 15, 16 to the smallest possible thicknesses of the polyimide films. |
