an electron emission device includes a display panel , first and second electrode drivers , and a controller . the display panel includes first electrodes in the column direction , second electrodes in the row direction , and an electron emission source . the first and the second electrode drivers drive the first and the second electrodes . the controller receives first vertical and horizontal synchronous signals and an input signal including video data , regenerates a first vertical synchronous signal and a second horizontal synchronous signal according to a blank - time information of a blank - time for representing no gray scales of an image and an on - time information of an on - time for representing the gray scales thereof , generates the drive signal for driving the display panel based on the regenerated second vertical and horizontal synchronous signals , and outputs them to the first and second electrode drivers .