| 摘要 |
PURPOSE: To enhance the accuracy of temperature compensation improving the temperature dependence of liquid crystal. CONSTITUTION: A liquid crystal driver IC22 has a power source circuit 30, an electronic volume SW2 varying the output voltage from the circuit 30, a temperature detecting part 120 and a correction table 132 in which electronic volume control values corresponding to temperatures which are to be detected by the part 120 are stored, The circuit 30 has a first power source circuit 30A having a first temperature-voltage characteristic, a second power source circuit 30B having a second temperature-voltage characteristic and a temperature inclination selecting circuit 36 outputting the voltage followed to a voltage characteristic having a desired temperature inclination based on output voltages from the first and second power source circuits, The circuit 120 detects an actual temperature based on the first and second temperature-voltage characteristics. The IC22 adjusts the output voltage from the circuit 30 based on the electronic volume control value in the table 132 corresponding to the actual temperature detected in the circuit 120 and outputs the adjusted output voltage.
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