| 摘要 |
In a liquid crystal display device which displays images by changing light transmission through formation of a bend alignment state of the liquid crystal, a large pretilt angle domain is formed on at least either the surface of the pixel electrode or the surface of the counter electrode and the large pretilt angle domain is so conditioned as to cause a larger pretilt angle of the liquid crystal molecules than the surrounding region does. This permits quick, reliable transition from a splay alignment state to the bend alignment state. Such transition is also facilitated by adding a chiral agent to a liquid crystal. A combination of the large pretilt angle domain and a chiral agent further facilitates occurrence of the transition. Another liquid crystal display device is designed such that the twist angle of the molecules of the liquid crystal ranges from 160° to 200° and that the fast response achieved by formation of an alignment state similar to the bend alignment state can be achieved without formation of the bend alignment state, by applying a driving voltage higher than the voltage, which causes the extremum of transmission in the driving voltage-transmission characteristic of the device, between the pixel and counter electrodes. In another liquid crystal display device, the pixels corresponding to the pixel electrode are divided into at least two domains which cause bend director fields having different orientations, thereby improving viewing angles. In still another liquid crystal display device, the twist angle of the molecules of the liquid crystal is in the range of from 160° to 200° or from 250° to 290° and the liquid crystal layer contains a dye or pigment. The device is driven with voltages in a certain high range. With this arrangement, the difficulty in causing the transition can be overcome. Another liquid crystal display device has pretilt angles varying according to the colors of pixels. This arrangement prevents hue shifts caused by changes in the transmission of the liquid crystal, the changes being due to the different wavelengths of transmitted light.
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