Method for determining an optimum skew and adjusting a clock phase of a pixel clock signal and data driver utilizing the same

Abstract

A data driver including a receiver, a skew adjusting circuit and a processing device is provided. The receiver samples image data on a data bus according to a processed pixel clock signal. The image data includes pixel data during active periods and a test pattern repeatedly inserted in the image data during blanking periods. The skew adjusting circuit receives a pixel clock signal and adjusts a clock phase of the pixel clock signal by delaying the pixel clock signal with a controllable skew according to a feedback control signal so as to generate the processed pixel clock signal. The processing device stores a predetermined test pattern synchronized with the inserted test pattern, determines an optimum skew by comparing the sampled test patterns with the predetermined test pattern, and generates the feedback control signal including information indicating the optimum skew.