Patent ID: 8595539

Claim:
A display apparatus comprising: an AD converter configured to convert an analog video signal into a digital video signal; a phase adjuster configured to adjust a phase of a quantization clock in the AD converter with respect to the analog video signal; a horizontal start position detector configured to detect a horizontal start position where an output value of the AD converter becomes a minimum value that exceeds a threshold level in a video horizontal direction; and a threshold level adjuster configured to adjust the threshold level, wherein the phase adjuster is configured to perform a quantization clock phase adjustment process comprising the following processes: a phase acquisition process to acquire, by sequentially changing an adjustable phase of the quantization clock, a start position change phase thereof which changes the horizontal start position detected by the horizontal start position detector, the phase acquisition process being performed for each of at least two different threshold levels; a first phase period calculation process to calculate, from the start position change phases acquired for the at least two threshold levels, a first phase period where the analog video signal starts its transition from a first level to a second level higher than the first level and then ends the transition; and a phase setting process to set a phase that is not included in the first phase period as an adjusted phase of the quantization clock.