A display with at least N(P−1)+1 number of gray levels extended from P number of gray levels is disclosed. The display includes a row driver, a column driver, scan lines and data lines crossing the scan lines to form a pixel matrix with pixels. The scan lines couple with the row driver and the data lines couple with the column driver. Each pixel further includes N number of sub-pixels and M number of transistors. The N number of sub-pixels are grouped into M number of sub-pixel groups. The M number of transistors control the M number of sub-pixel groups respectively and each sub-pixel group receives one of the P number of gray levels to display corresponding gray levels.