Patent ID: 7522131

Claim:
An Electron Emission Display (EED) device comprising: a scan driver: a data driver; an EED panel adapted to display a display data signal according to a scan signal of the scan driver, the display data signal obtained by modulating a pulse width of video data from the data driver; a reference signal memory adapted to store a lookup table of active pulse widths of horizontal synchronization signals defined by a system clock and reference signals corresponding to the active pulse widths of the horizontal synchronization signals, the lookup table being arranged to store values to expand an expression range of gray levels beyond a predetermined number of grayscale levels; a reference signal referring unit adapted to output a reference signal in accordance with the lookup table stored in the reference signal memory; a gray level signal generator adapted to count the reference signal and output a gray level signal to the data driver; and a synchronization signal counter adapted to examine the active pulse width of a horizontal synchronization signal; wherein the data driver outputs the display data signal corresponding to the gray level signal and the video data to data electrode lines of the EED panel; and wherein the synchronization signal counter is adapted to count the horizontal synchronization signal based on the system clock and to output an active pulse width value of the horizontal synchronization signal to the reference signal referring unit.