Grayscale control structure and method, liquid crystal display panel and display device

A grayscale control method, applied in a grayscale control structure, wherein the grayscale control structure, comprising a first substrate, a light extraction layer, an electrode layer, a liquid crystal layer, a filter layer and a second substrate which are sequentially stacked;

• wherein the electrode layer is provided with a plurality of strip-shaped electrodes arranged in parallel to form lens units in the liquid crystal layer, the filter layer comprises light exit strips and a black matrix arranged in parallel, and the light exit strips are disposed opposite to the lens units, and light extraction gratings are disposed in the light extraction layer, the light extraction gratings are disposed opposite to the light exit strips, and a projection of individual one of the light exit strips on the light extraction layer covers a corresponding one of the light extraction gratings;
• wherein the method comprises:
• according to a display requirement, adjusting voltage applied onto each of the plurality of strip-shaped electrodes to change the shape of each of the lens units, so that light refracted by each of the lens units passes through the light exit strips or is shielded by the black matrix.