LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a high-quality display by preventing interference fringes on a display screen from occurring due to switching noise of a DC-DC converter. SOLUTION: The switching frequency of the DC-DC converter is synchronized with the control signal in phase by inputting an input signal to the timing control circuit into a PLL circuit, and controlling the DC-DC converter with the output of the PLL circuit.