| 摘要 |
A liquid crystal shutter of this invention comprises a liquid crystal element holding a nematic liquid crystal, of 180° to 260° in twist angle, between a pair of substrates, a pair of polarizing plates sandwiching the liquid crystal element, and a retardation film inserted between the liquid crystal element and one polarizing plate. The angle formed by the absorption axes of the polarizing plates is set in the range of 80° to 100°, the angle formed between the absorption axis of one of the polarizing plates and the direction of the central liquid crystal molecule of the liquid crystal element is set in the range of 40° to 60°, and the delay axis of the retardation film is arranged substantially parallel to the alignment direction of the central liquid crystal molecule of the liquid crystal element. Further, the retardation film is arranged on a discotic film at an inclination angle varying along thickness in such a manner that the alignment direction of the retardation film is substantially orthogonal to the direction of the central liquid crystal molecule. Furthermore, the liquid crystal shutter comprises a first retardation film and a second retardation which are, for example, aligned on the retardation film with an inclination angle varying along the thickness thereof (FIG. 1).
|
