In a current display panel illustrated in FIG. 4 showing a display image after a pixel shift unit in a display module 000′. The display panel 10′ of the display module 000′ includes at least three sub-pixels 20′ with different colors. The pixel shift unit changes polarization of the light from the display panel 10′ at different time and then induces different shift of light paths at different time. Correspondingly, at different time, a same sub-pixel 20′ of the display panel 10′ is displayed at different position and does not interfere other sub-pixels 20′. A visual resolution of the display panel and a resolution of the display module 000′ are improved. In FIG. 4, the sub-pixels with solid line frames indicate displayed images without shift induced by the pixel shift unit and the sub-pixels with broken line frames indicate displayed images with shift induced by the pixel shift unit. The sub-pixels with same filling patterns indicate the sub-pixels with same color. Although the displayed imaged are formed by the displayed images without shift induced by the pixel shift unit and the displayed images with shift induced by the pixel shift unit together, in a monochrome image, since a pixel point of a same sub-pixel 20′ without shift induced by the pixel shift unit and a pixel point of the same sub-pixel 20′ after shift induced by the pixel shift unit aggregate together, the image is more grainy. The display quality of the entire display module 000′ is reduced.