Liquid crystal display device with controllable viewing angle and driving method thereof

A driving method for a liquid crystal display device, the liquid crystal display device comprising:

• an upper substrate on which an upper substrate common electrode is disposed,
• a lower substrate parallel to the upper substrate on which a pixel electrode is disposed, and
• a liquid crystal layer sandwiched between the upper substrate and the lower substrate, liquid crystal molecules are perpendicular to the upper substrate in substance when no voltage is applied,
• wherein a plurality of strip-like lower substrate common electrodes are disposed on the lower substrate and arranged in parallel substantially,
• the driving method comprising the following steps:
• applying a voltage to the upper substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate and thus provide a first viewing angle mode;
• applying a voltage to the lower substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate and an electric field parallel to the upper substrate and thus provide a second viewing angle mode;
• and
• switching between the first viewing angle mode and the second viewing angle mode by selectively applying the voltage to the upper substrate common electrode or the lower substrate common electrode,
• wherein there is an angle between a viewing direction of the first viewing angle mode and a viewing direction of the second viewing angle mode.