Timing controller including configurable clock signal generators according to display mode and display device having the same

A timing controller includes a display mode detection circuit configured to detect an image display mode of a display panel based on a plurality of first image data signals that are output in synchronization with a first clock signal having a first frequency, and to selectively activate at least one clock signal generation selected among a plurality of clock signal generators based on the detected image display mode, the clock signal generators configured to generate a second clock signal having a second frequency, respectively when activated by the display mode detection circuit, and to apply the second clock signal to a plurality of signal converting circuits, respectively, and the signal converting circuits configured to convert the first image data signals into a plurality of second image data signals that are output in synchronization with the second clock signal.