Display apparatus for alleviating a problem of image flicker by regulating a common voltage

A display apparatus, comprising:

• a display panel, comprising a first input line and a first output line, wherein the first input line obtains a common voltage, and the first output line outputs a common feedback voltage;
• a voltage regulating unit, comprising a second output line, wherein the second output line outputs the common voltage, and the voltage regulating unit is a mechanical voltage regulator and is electrically connected to the display panel;
• and
• a timing controller, comprising a control line and a second input line, wherein the control line outputs a voltage regulating signal, and the second input line obtains the common feedback voltage, wherein
• the timing controller is electrically connected to the display panel and the voltage regulating unit;
• the timing controller continuously obtains the common feedback voltage at a speed twice a frame rate, obtains a maximum feedback voltage and a minimum feedback voltage from the common feedback voltage in a period, and the timing controller calculates a deviation value according to the maximum feedback voltage and the minimum feedback voltage;
• when the deviation value exceeds the voltage threshold, the timing controller outputs the voltage regulating signal, the voltage regulating unit regulates a voltage value range forward or backward by using the common voltage as a start according to the voltage regulating signal;
• and the timing controller continuously obtains the deviation value in a period of outputting the voltage regulating signal;
• and
• when the timing controller obtains a minimum deviation value from the deviation value and the minimum deviation value is less than the voltage threshold, the timing controller stops sending the voltage regulating signal, so that the voltage regulating unit stops regulating the common voltage.