1. A transflective liquid crystal display (LCD), comprising: a plurality of scan lines disposed along a first direction on a substrate; a plurality of data lines, disposed along a second direction on the substrate, so that a plurality of pixel regions comprising a plurality of sub-pixel regions defined by the data lines and the scan lines, and at least three of the sub-pixel regions are as a color sub-pixel regions and at least one of the sub-pixel regions is as a fourth sub-pixel region, wherein the color sub-pixel regions are a transmission region within a transmissive electrode; and a plurality of switch devices adapted to control the color sub-pixel regions and the fourth sub-pixel region.