Viewing-angle adjustable liquid crystal display and method for adjusting viewing-angle of the same

A viewing-angle adjustable liquid crystal display, comprising:

• a display panel having a plurality of pixel units, each pixel unit comprising a first sub-pixel and a second sub-pixel;
• and
• a data driver for providing a first driving voltage to the first sub-pixel and a second driving voltage to the second sub-pixel, respectively;
• wherein when the liquid crystal display is operated in a wide viewing-angle mode, the first driving voltage and the second driving voltage corresponding to each pixel unit are substantially equal to a pixel voltage, and when the liquid crystal display is operated in a narrow viewing-angle mode, the first driving voltages and the second driving voltages corresponding to the pixel units in one portion of the display panel are substantially equal to a gray-level voltage and the pixel voltage, respectively, while the second driving voltages and the first driving voltages corresponding to the pixel units in another portion of the display panel are substantially equal to the gray-level voltage and the pixel voltage, respectively.