1. A display panel, comprising: a plurality of pixel groups arranged in a first direction and a different second direction in a two-dimensional array, each pixel group comprising four pixels, including a first pixel, a second pixel, a third pixel and a fourth pixel, such that the first pixel is arranged in parallel immediately adjacent to the second pixel in the first direction and also arranged in parallel immediately adjacent to the third pixel in the second direction, wherein the first pixel and the second pixel are different in color content, and the first pixel and the third pixel are different in color content, and wherein the first and fourth pixels have same color content, and the second and third pixels have same color content, and wherein the first pixel consists of a first color sub-pixel and a different second color sub-pixel arranged in parallel to each other and immediately adjacent to each other in the first direction, and the second pixel consists of a third color sub-pixel and a different fourth color sub-pixel arranged in parallel to each other and immediately adjacent to each other in the second direction, wherein each of the first color sub-pixel, the second color sub-pixel, the third color sub-pixel and the fourth color sub-pixel has a longer dimension and a shorter dimension such that the longer dimension of the first color sub-pixel is immediately adjacent to the longer dimension of the second color sub-pixel, and the longer dimension of the third color sub-pixel is immediately adjacent to the longer dimension of the fourth color sub-pixel.