| 摘要 |
PURPOSE:To permit color display with a high contrast ratio and good color reproducibility by twisting and rotating two layers of liquid crystal molecules in the opposite directions, right and left and setting the orientation directions of two layers of the liquid crystal molecules approximate to each other at the directions orthogonal with each other. CONSTITUTION:The twist angle of the liquid crystal molecules of liquid crystal layers 15, 16 of a 1st layer cell and 2nd layer cell are 90 deg.. A transparent conductive film 12 is provided only to the 2nd layer cell. The twist angles of the liquid crystal molecules of the 1st layer and the 2nd layer are opposite on the right and left. The transmissivity of red and blue colors is lower with the two-layer type cell when compared with the characteristics of the single-layer type cell at the time of impression of the voltage of <=the threshold level. The higher contrast ratio can, therefore, be obtd. with this cell. The dependency of the characteristics on wavelength is much smaller with the two-layer type than with the single-layer type. The twisting and rotating directions of two layers of the liquid crystal molecules are opposite from each other, right and left and the liquid crystal molecules of the two layers in proximate to each other are oriented in the directions orthogonal with each other. As a result, the color display with the good color reproducibility is permitted.
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