Colorful liquid crystal thin film, method of manufacturing thereof and display device

A method of manufacturing a colorful liquid crystal thin film, comprising:

• adjusting a voltage applied across a liquid crystal cell filled with a blue phase liquid crystal until the liquid crystal cell shows a first required color;
• radiating a first portion of the liquid crystal cell needed to show the first required color by a mercury lamp and then radiating the first portion of the liquid crystal cell needed to show the first required color by ultraviolet rays, while the voltage is maintained across the liquid crystal cell, a pitch of the blue phase liquid crystal in the first portion of the liquid crystal cell being adjusted and fixed accordingly;
• suspending applying the voltage across the liquid crystal cell until a remaining portion of the liquid crystal cell returns to a clear state, while the first portion of the liquid crystal cell shows the first required color;
• reapplying and adjusting the voltage across the liquid crystal cell until the remaining portion of the liquid crystal cell shows a second required color, while the first portion of the liquid crystal cell shows the first required color;
• and
• radiating a second portion of the liquid crystal cell needed to show the second required color by ultraviolet rays, the second portion being at least part of the remaining portion of the liquid crystal cell.