1. An electronic device comprising: a host device configured to provide a display device with first image data having a first number of bits per pixel in a normal mode, and to convert the first image data into second image data having a second number of bits per pixel less than the first number of bits per pixel to provide the display device with the second image data in a low power mode; the display device configured to display a first image based on the first image data in the normal mode, and to convert the second image data into third image data to display a second image based on the third image data in the low power mode; and a plurality of data lanes located between the host device and the display device, the plurality of data lanes being used to transfer the first image data and the second image data.