Liquid crystal display with switchable viewing angle and method of viewing angle control

An LCD (liquid crystal display) with switchable viewing angle, comprising:

• a first substrate being provided with a first electrode and a first alignment film thereon;
• a second substrate being provided with a second electrode, a third electrode and a second alignment film thereon, wherein one of the second electrode and the third electrode is a common electrode, and the other one of the second electrode and the third electrode is a pixel electrode;
• a liquid crystal layer being disposed between the first alignment film and the second alignment film, the liquid crystal layer comprising a plurality of liquid crystal molecules, wherein the liquid crystal molecules are negative liquid crystal molecules, the liquid crystal molecules adjacent to the first alignment film are tilted at a first pretilt angle, the liquid crystal molecules adjacent to the second alignment film are tilted at a second pretilt angle, the second pretilt angle is in the range of 30° to 50°, and the first pretilt angle is in the range of 0° to 5°;
• wherein when no bias voltage is applied to the first electrode, the LCD is displayed with a narrow viewing angle;
• and when a bias voltage is applied to the first electrode to generate a vertical electric field between the first substrate and the second substrate, the LCD is displayed with a wide viewing angle.