Liquid crystal display device and driving circuit thereof for note-sized personal computer

An LCD device for a note book computer and a driving circuit thereof are provided to prevent display error in an initial operation by supplying initial information required for the initial operation to the note book computer. A driving circuit of an LCD(Liquid Crystal Display) device for a note book computer includes a timing controller(120), and first and second memories(110,130). The timing controller includes a register, which executes the storing operation of screen adjusting data to be transmitted to a computer system, driven by a first source voltage. The first memory, which is driven by the first voltage source, stores the screen adjusting data supplied to the register. The second memory, which is driven by the first source voltage, stores EDID(Extended Display Identification Data) data supplied to the computer system.