| 摘要 |
<p>PURPOSE:To minimize the dependence of liquid crystal layer temperature on an environmental temperature by incorporating a metallic electrode which is a heat-generating body in a liquid crystal panel, detecting its temperature to control energization with a temperature control circuit and keeping the temperature of the metallic electrode constant. CONSTITUTION:A liquid crystal light panel consists of a substrate 3 provided with a liquid crystal panel 1, a deflecting board 2 and a liquid crystal drive circuit, and a scanning electrode substrate 4 of the liquid crystal panel 1 is provided with metallic electrodes 6, 10 which are heat-generating bodies on the both sides. Both the sides are not opposed to a signal electrode substrate 7 because of the application of voltage to the sides. The heat-generating electrode 6 is allowed to be exposed to the exterior of the signal electrode substrate 7 after bending halfway, with a thermister 8 fixed with an adhesive member 9. The temperature of the heat-generating electrodes 6, 10 is detected by the thermister 8 and a temperature detecting means 35, and compared with a set temperature 36 through a comparison circuit 37. Energization of the heat- generating electrodes 6, 10 from a power supply 40 via an output part drive circuit 38 and an output 39 is controlled according to a deflection value of the compared temperature. Thus the set temperature can be reached in a short time and the dependability on an environmental temperature is reduced.</p> |
