Demultiplexer and the driving method and active display thereof

The present invention provides an active display comprising a pixel matrix, a data line, a first signal line, a second signal line and a demultiplexer (DeMux). Every pixel in the pixel matrix comprises a first sub-pixel and second sub-pixel. The Data line, the first and the second signal line provide data signal, first and second predetermined voltage respectively. DeMux comprises a first and a second driving units used to drive the first and the second sub-pixel respectively. The first and the second driving unit comprise a first and a second transistor respectively. The first and the second transistor output data signal to the first and second sub-pixel according to a first and second control signal respectively. The second driving unit further comprises a third and a fourth transistor. The third and fourth transistors output the first and second predetermined voltage to the second sub-pixel respectively, so as to pre-charge and pre-discharge the voltage of the second sub-pixel.