Patent ID: 7692615
Filing Date: 2010-04-06
Classification: G09G

Abstract:
1. A display driver comprising: a polarity reversal signal generation circuit that generates a polarity reversal signal by delaying a signal based on a horizontal synchronization signal and a vertical synchronization signal; and a driver section that outputs a drive voltage based on display data, a polarity of the drive voltage being reversed in synchronization with the polarity reversal signal, the polarity reversal signal generation circuit including: an output counter that outputs a coincidence signal when the output counter counts a given number of pulses of a dot clock signal, the output counter starting count of the given number of pulses based on an edge of the horizontal synchronization signal, a first toggle flip-flop that outputs a first output signal, the first output signal changing in synchronization with the vertical synchronization signal, a second toggle flip-flop that outputs a second output signal, the second output signal changing in synchronization with the horizontal synchronization signal, a logic circuit that performs an exclusive-OR operation on the first output signal and the second output signal, and a flip-flop that outputs the polarity reversal signal based on the coincidence signal, and an output signal from the exclusive-OR operation of the logic circuit being input to the flip-flop.