Display device including a data driver performing clock training, and method of operating the display device

A display device comprising:

• a display panel including a plurality of pixels;
• a controller configured to provide a clock-embedded data signal, the clock-embedded data signal including image data in an active period and including a training pattern in a blank period;
• and
• a data driver configured to receive the clock-embedded data signal, to recover the image data based on an internal clock signal in the active period, to provide data voltages corresponding to the image data to the plurality of pixels in the active period, and to perform a training operation for the internal clock signal using the training pattern,
• wherein the controller detects whether a frame frequency is changed, and transfers the training pattern including a first training clock signal modulated with a first modulation period during a first time and including a second training clock signal modulated with a second modulation period different from the first modulation period after the first time in the blank period when or after the frame frequency is changed.

A method of operating a display device, the method comprising:

• providing, using a controller of the display device, a clock-embedded data signal including image data to a data driver of the display device in an active period;
• recovering, using the data driver, the image data based on an internal clock signal to provide data voltages corresponding to the image data to a plurality of pixels of a display panel of the display device in the active period;
• providing, using the controller, the clock-embedded data signal including a training pattern to the data driver in a blank period;
• and
• performing, using the data driver, a training operation for the internal clock signal using the training pattern,
• wherein the training pattern in the blank period includes a first training clock signal modulated with a first modulation period during a first time, and includes a second training clock signal modulated with a second modulation period different from the first modulation period after the first time.