Method for driving display device, and display device

A display device, comprising an array substrate, a memory, a processor and a computer program stored in the memory and executable by the processor, wherein the array substrate comprises a pixel array, and the processor is configured to, when executing the computer program, implement steps of a method for driving the display device, comprising:

• obtaining a refresh frequency of a current frame image;
• and
• adjusting a common voltage of all pixels in a second vertical blank interval to control a difference value between a first voltage difference and a second voltage difference to be within a preset-voltage-difference-range if the refresh frequency of the current frame image is different from a refresh frequency of a reference frame image, the preset-voltage-difference-range is equivalently replaced with a single ideal value 0;
• wherein the first voltage difference is a root mean square of m difference values between m common voltages and m pixel voltages of the pixels obtained at m time points in a first vertical blank interval when the reference frame image is displayed on the display device;
• the second voltage difference is a root mean square of n difference values between n common voltages and n pixel voltages of the pixels obtained at n time points in the second vertical blank interval when the current frame image is displayed on the display device;
• wherein when the reference frame image is displayed by the display device a vertical blank interval of the display device is defined as the first vertical blank interval;
• when the current frame image is displayed by the display device, the vertical blank interval of the display device is defined as the second vertical blank interval.