Embodiments of the invention disclose a method for displaying image and a display device. In the display panel, 2*2 pixels constitute one repeating group, each repeating group contains two pixels composed of a B sub-pixel and a Y sub-pixel and two pixels composed of a R sub-pixel and a G sub-pixel, and sub-pixels included in neighboring pixels in the horizontal or vertical direction within the repeating group are different, thus compared to the existing arrangement in which three or more sub-pixels constitute one pixel, the number of sub-pixels in each pixel is reduced, enabling the resolution of image displayed to be enhanced under the same fabrication precision. And after converting the received RGB image signal of each pixel of the frame to be displayed into corresponding RG/BY image signal respectively, depending on arrangement of sub-pixels in each pixel of the display panel, image signal corresponding to sub-pixels of each pixel in the display panel is determined based on the RG/BY image signal corresponding to each pixel of the frame to be displayed, then the image is displayed, therefore, normal display can be ensured, image of the frame to be displayed can be rendered better.