Provided is a data transmission method, including: sending clock calibration data to a source driver chip, wherein the clock calibration data instructs the source driver chip to perform clock calibration; sending first configuration information to the source driver chip over a data channel in response to completing the clock calibration by the source driver chip, wherein the first configuration information instructs the source driver chip to perform a configuration on a physical layer parameter; and successively sending a link stable pattern and display data to the source driver chip.