Liquid crystal display module driving circuit

摘要

A circuit for driving a LCM, comprising: a power supply portion for receiving an external voltage of 12V to generate internal voltages of 3.3V and 5V; a clock generation portion for generating a clock signal of desired frequency; a driving signal generation portion for receiving the clock signal from the clock generation portion to generate driving signals of a data enable signal, a horizontal synchronous signal, a vertical synchronous signal, and an enable signal; a signal selection portion for selecting the desired signals of the driving signals from the driving signal generation portion and outputting the selected driving signals and the clock signal from the clock generation portion; a state detection portion for receiving the vertical synchronous signal and the external voltage of 5V to detect a normal operation state of the LCM; a power selection portion for selecting one of an external voltage of 5V and the external voltage of 12V in accordance with application of the internal voltage of 5V; and an output portion for outputting the selected driving signals and clock signal from the signal selection portion, the selected power voltage from the power selection portion and a state detection signal from the state detection portion.