Liquid crystal lens, method for producing the same, and display apparatus

A method for producing a liquid crystal lens, comprising:

• providing a first substrate and a second substrate;
• and
• forming a plurality of prism units between the first substrate and the second substrate, wherein each of the prism units comprises a first electrode and a second electrode group, the second electrode group comprises a plurality of second electrodes, the plurality of second electrodes are arranged in a line in a first direction, a liquid crystal layer is provided between the first electrode and the second electrode group, the first electrode and the second electrode group are configured to apply drive voltage to the liquid crystal layer to form a gradient electric field in the prism unit, gradient electric field makes long axes of the liquid crystal molecules in the liquid crystal layer to change in the first direction in the prism unit from being perpendicular to the first substrate at one end of the prism unit to being parallel to the first substrate at the other end of the prism unit, and wherein a transparent insulating prism unit-separating structure is provided between two prism units adjacent in the first direction, and refractive index of the prism unit-separating structure is the same as that of the long axis of the liquid crystal molecule constituting the liquid crystal layer, and an orthogonal projection of the prism unit-separating structure on the second substrate is outside an orthogonal projection of the second electrode on the second substrate, and there is no electrode on a surface of the prism unit-separating structure, so that upon the drive voltage being applied, long axes of liquid crystal molecules at one side of the prism unit-separating structure are perpendicular to the first substrate, while axes of liquid crystal molecules at the other side of the prism unit-separating structure are parallel to the first substrate,
• wherein the prism unit-separating structure has a total height less than the thickness of the liquid crystal layer, and the direction of the height of the prism unit-separating structure is the same as the direction of the thickness of the liquid crystal layer.