Display control apparatus and method having dynamic backlight adjusting mechanism

A display control method with a dynamic backlight adjustment mechanism, comprising:

• receiving and detecting, by a vertical synchronization signal phase detection circuit, a vertical synchronization period of a vertical synchronization signal;
• generating, by a backlight control signal generating circuit, a backlight control signal to a display, wherein a backlight period of the backlight control signal is 1/N times of the vertical synchronization period;
• calculating, when the vertical synchronization period is changed from a first period length to a second period length, by a computing circuit, the end time of the first vertical synchronization period after the vertical synchronization signal starts operating with the second period length;
• determining, by the computing circuit, an end time of a first backlight period of the backlight control signal after the end time of the vertical synchronization period as a transition period start time;
• calculating, by the computing circuit, a time difference between the start time of the transition period and the end time of the vertical synchronization period;
• calculating, by the computing circuit, a transition period length between the second period length and the time difference, wherein the transition period length corresponds to a transition period;
• dividing, by the computing circuit, the transition period length evenly into at least one interval length, each as a third period length, wherein each interval length is closest to 1/N times of the second period length;
• and
• generating, by the computing circuit, an adjustment signal to control the backlight control signal generating circuit to generate the backlight control signal having the third period length in the transition period.