Patent ID: 7880830

Claim:
A double-sided liquid crystal display comprising: a light guide plate comprising a first light emitting surface and a second light emitting surface, the first and second light emitting surfaces being configured for light emission; a plurality of illuminators configured for providing light beams for the light guide plate; a first liquid crystal panel configured for receiving the light beams from the first light emitting surface; a second liquid crystal panel configured for receiving the light beams from the second light emitting surface; a driving circuit comprising a first driving unit, a second driving unit, a switching unit and a main system, the first driving unit configured for driving the first liquid crystal panel, and the second driving unit configured for driving the second liquid crystal panel; and a Hall-effect switch configured for monitoring a rotation status of the first liquid crystal panel and generating corresponding variation signals; wherein the switching unit is configured for switching the first driving unit and the second driving unit according to the variation signals, the main system is configured for providing voltages and data signals for the first and second driving units, the switching unit comprises a first channel and a second channel, and the first channel is switched on or off and the second channel is switched on or off according to the corresponding variation signals from the Hall-effect switch; when the first channel is switched on, the main system provides the voltages for the first driving unit via the first channel, and the second driving unit is switched off; and when the second channel is switched on, the main system provides the voltages for the second driving unit via the second channel, and the first driving unit is switched off; and when the first liquid crystal panel is configured to display, all the illuminators are lit up to illuminate the first liquid crystal panel; and when the second liquid crystal panel is configured to display, only a fraction of the illuminators is lit up to illuminate the second liquid crystal panel, wherein the fraction of the illuminators comprises at least one illuminator.