LCM(LIQUID CRYSTAL MODULE) DRIVING CIRCUIT

摘要

PURPOSE: A liquid crystal module driving circuit is provided, which changes a switch by module to be driven so that it drives enable mode and synchronous mode of VGA-class liquid crystal module. CONSTITUTION: The liquid crystal module driving circuit comprises the sections of: a power voltage generation section; a socket-typed clock generation section to generate 25.175MHz clock signal; a driving signal generation section which generates vertical and horizontal synchronous signal, data enable signal and enable signal; an output section which selects an input signal by the output of a selection switch; an output stage which connects an output signal to a base plate for interface circuit to drive LCM; a first check section which checks normal operation of the driving circuit; a second check section which outputs 5V voltage for driving IC and 12V voltage for driving relay; and a circuit protection section which selects external voltage to protect the driving circuit when power voltage is permitted from external and internal side simultaneously.