| 摘要 |
PURPOSE:To obtain an invariably sharp display by detecting the temperature or ambient temperature of a liquid crystal panel and rotating the angle of intersection of the axes of polarization of polarizing elements according to the detection result. CONSTITUTION:A thermocouple, a thermistor, etc., are usable as a detecting means for temperature to detect the temperature or ambient temperature of the liquid crystal panel 1. Further, transmissivity temperature characteristics of the liquid crystal display device or temperature characteristics of the thickness and liquid crystal properties of a liquid crystal layer are measured previously to find the angle of intersection of the axes of polarization of the polarizing elements 2 and 3 according to the measured characteristics, and a control means uses a controller 5 incorporated in a microcomputer, a circuit, etc. Further, a driving means uses a rotating device 6 which uses a motor, a sticking type piezoelectric element of a bimetal, bimorph, etc., shape memory alloy, etc., so as to accurately rotate the polarizing plates. Then the temperature of the liquid crystal panel 1 is detected at any time and the angle of intersection of the axes of polarization of the polarizing elements 2 and 3 is rotated according to the detected temperature to perform compensation so that the contrast is maximum. Consequently, the invariably sharp display is obtained. |
