This paper mainly introduces the segment type liquid crystal display principle and control methods in design and application of digital display instrument. The liquid crystal display system made by Texas Instruments with ultra low power microcontroller CC430F6137
which has a segment type LCD controller
can drive 96 segments at most. The GD46532 LCD module is designed by DaLian JiaXian electronic Co.
Ltd. The authors design the driving program in temperature sampling system
and also give the twinkle display way to display the value of sampled temperature. By application testing
the digital instrument with LCD controller can reduce the system size to the largest extent. The system is high reliable. Its program is easily portable in other systems.