DISPLAY CONTROLLER, DISPLAY DEVICE, DISPLAY SYSTEM, AND CONTROL METHOD FOR DISPLAY DEVICE

摘要

A display controller which is changeable in a refresh rate indicative of a switching frequency of screens displayed on a display device provided with a plurality of pixels from a low refresh rate of 40 Hz to an ordinary refresh rate of 60 Hz, generates, and supplies the display device with, a dot clock signal (standard clock signal) that is an operation timing signal in the inside of the display device, video data displayed on the screen, an Hsync for defining a horizontal period of a display to the screen, and a Vsync for defining a vertical period of a display to the screen includes a dot clock signal generating circuit for generating the standard clock signal with the same frequency not depending on the refresh rates. Thus, the occurrence of noise can be suppressed even in the case that the refresh rate is changed.