| 摘要 |
PURPOSE:To obtain a tin lightweight liq. crystal device enabling clear black-and- white display and ensuring a wide angle of vision by using uniaxially stretched polycarbonate films as phase plates and specifying the direction of laminating of the films. CONSTITUTION:An upper laminated phase plate 2 and a lower phase plate 4 are set above and below an STN liq. crystal cell 3 and uniaxially stretched polycarbonate films are used as the plates 2, 4. the upper plate 2 is obtd. by laminating two phase plates and these plates are laminated at >=20 deg. angle of crossing of the lagging axis of the 1st plate and that of the 2nd plate so that the direction of the lagging axis of the 2nd plate is made parallel to a direction in which the dependency of the retardation value of the 1st plate on elevation is minimized. The angle of crossing of the delay phase axis of the phase plate adjacent to the cell 3 and the axis of rubbing of the substrate adjacent to the plate is regulated to 70-90 deg.. |
