Patent ID: 8519931
Filing Date: 2013-08-27
Classification: G09G

Abstract:
1. A drive control method in a source driver for receiving from a timing controller a horizontal synchronization signal of an image signal and a binary control signal of which a value varies in two values for each one line or two lines of a display panel in synchronization with said horizontal synchronization signal and in which start values of adjacent frames of said image signal are different, excluding a vertical synchronization signal of said image signal, so as to apply drive voltages to a plurality of source signal lines of the display panel, the drive voltages each having a polarity corresponding to a value of the binary control signal, the drive control method comprising: a blanking period determining step of determining a blanking period of said image signal on the basis of a pulse count of said horizontal synchronization signal and generating a signal indicative of the blanking period; a step of determining whether an AC (alternating current) drive inversion method is a dot inversion drive scheme in which the value of the binary control signal varies for each one line, or a two-line dot inversion drive scheme in which the value of the binary control signal varies for each two lines, in accordance with said horizontal synchronization signal, a result of the determination of said blanking period, and said binary control signal; a pseudo vertical synchronization signal generation step of generating a pseudo vertical synchronization signal indicative of one frame period including the blanking period of said image signal by counting the number of pulses of said horizontal synchronization signal; and an offset cancel step of performing a cancel operation of an offset voltage component of each of said drive voltages on the basis of said horizontal synchronization signal, said pseudo vertical synchronization signal, the determination result of said blanking period, and a result of the determination of said AC drive inversion method, so that the offset voltage component is canceled even if said AC drive inversion method is either the dot inversion drive scheme or the two-line dot inversion drive scheme.