Liquid crystal display, display panel and reference voltage control method and device

A reference voltage control method of a display panel, comprising:

• acquiring a refreshing frequency of the display panel;
• invoking a reference voltage database according to the refreshing frequency, to acquire reference voltage data corresponding to the refreshing frequency;
• generating a reference voltage adjusting signal for adjusting a reference voltage signal fixedly output by the display panel according to the reference voltage data;
• and
• synthesizing the reference voltage adjusting signal and the reference voltage signal fixedly output by the display panel to generate a reference voltage synthesis signal, and outputting the reference voltage synthesis signal to a reference voltage signal input terminal of the display panel,
• wherein the reference voltage database is built by:
• acquiring a refreshing frequency range of the display panel;
• detecting brightness and flicker value of the display panel at different refreshing frequencies in the refreshing frequency range respectively, to acquire a relationship between the refreshing frequency and the brightness and that between the refreshing frequency and the flicker value;
• acquiring a reference brightness and a reference flicker value range according to the relationship between the refreshing frequency and the brightness and that between the refreshing frequency and the flicker value;
• and
• adjusting reference voltage signals output by the display panel at different refreshing frequencies by inputting different reference voltage data, and obtaining reference voltage data at which the brightness of the display panel reaches the reference brightness and the flicker value of the display panel is within the reference flicker value range at each refreshing frequency,
• wherein the reference voltage database comprises a relationship between the refreshing frequency and the reference voltage data.