Abstract: A signal processing method, a display apparatus, a timing controller, and a source driver. The signal processing method includes: a source driver receiving N pixel data signals supplied by a timing controller and converting the pixel data signals into N display data signals for display on a display panel; obtaining phase difference information of a first phase difference of the N pixel data signals when the N pixel data signals arrive at the source driver; and reducing a second phase difference of the N display data signals supplied by the source driver, according to the phase difference information, wherein N is a positive integer greater than 2. The signal processing method may make the signals achieve an effect of phase synchronization after transmission, improve signal quality, and reduce a difficulty in signal processing.