Display apparatus and voltage calibration method

A voltage calibration method, applied to a display apparatus, the display apparatus comprising a timing controller, a ramp voltage generator and a ramp counter, when the ramp voltage generator generates a ramp voltage, the ramp counter starting counting, the voltage calibration method comprising steps of:

• (a) when the ramp voltage is increased to be equal to the reference voltage, recording an instant counting value of the ramp counter and transmitting the instant counting value to the timing controller;
• (b) the timing controller comparing the instant counting value with a default value;
• and
• (c) the timing controller selectively calibrating the rising slope of the ramp voltage generated by the ramp voltage generator,
• wherein the display apparatus further comprises a comparator;
• two input terminals of the comparator are coupled to the ramp voltage generator and the reference voltage respectively;
• the comparator is configured to compare the ramp voltage with the reference voltage to determine whether the ramp voltage is increased to be equal to the reference voltage, and
• wherein the display apparatus further comprises a D-type flip-flop;
• two input terminals of the D-type flip-flop are coupled to an output terminal of the comparator and the ramp counter respectively;
• an output terminal of the D-type flip-flop is coupled to the timing controller;
• when the ramp voltage is increased to be equal to the reference voltage, the D-type flip-flop transmits the instant counting value provided by the ramp counter to the timing controller.