A flat display includes a substrate, a pixel matrix, a data driver and a number of bias apparatuses. The pixel matrix is disposed on the substrate and includes several columns of first pixels and several columns of second pixels, wherein each column of second pixels is located between two adjacent columns of first pixels. The data driver is for outputting a plurality of data signals to the columns of first pixels. The bias apparatuses are disposed on the substrate, and respectively coupled to the columns of second pixels. Each of the bias apparatuses outputs a bias data signal to the corresponding column of second pixels according to the two data signals outputted to the two columns of first pixels adjacent to the corresponding column of second pixels.