Display apparatus and driving method thereof synchronizing frequencies of a synchronization signal and dimming signal

A display apparatus comprising:

• a display panel which displays an image in response to a gate voltage and a data voltage;
• a panel driver which receives a control signal, and which supplies the gate voltage and the data voltage to the display panel according to the control signal;
• a backlight which supplies a light to the display panel;
• an inverter which receives a backlight dimming signal, and which controls a brightness of a light emitted from the backlight according to the backlight dimming signal;
• and
• a timing controller which receives a synchronization signal, and which determines a frame frequency of the display panel according to the synchronization signal, outputs the control signal, and modulates the synchronization signal based on a ratio of a predetermined dimming frequency to the frame frequency, and which outputs the backlight dimming signal according to the modulated synchronization signal;
• wherein the ratio has a fraction form obtained by dividing the backlight dimming frequency by the frame frequency,
• wherein the timing controller comprises:
• a memory which stores the backlight dimming frequency;
• a comparator which reads out the backlight dimming frequency from the memory and outputs the ratio corresponding to the read-out backlight dimming frequency;
• and
• an inverter synchronizer which modulates the synchronization signal based on the ratio to output the backlight dimming signal, and
• wherein the comparator comprises first and second look-up tables each of which has at least one column representing a frame frequency and at least one row representing a backlight dimming frequency, and the first look-up table stores a denominator value of the ratio and the second look-up table stores a numerator value of the ratio.