In one embodiment, the plurality of sub-pixels 20 in the display panel 10 may emit natural light. The birefringent layer 301 may be disposed at a side of a light-emitting surface of the display panel 10, and the light valve 302 may be disposed between the display panel 10 and the birefringent layer 301, to control a polarization direction of light incident on the birefringent layer 301. The polarization direction of the light incident on the birefringent layer 301 may be controlled to be a first polarization direction at the first time, and the polarization direction of the light incident on the birefringent layer 301 may be controlled to be a second polarization direction at the second time. The first polarization direction and the second polarization direction may be both parallel to the light-emitting surface of the display panel 10, and may be perpendicular to each other. In FIG. 7, the light is indicated by lines with arrows and directions pointed by the arrows are propagating directions of the light. The lines with circles indicate the light with the first polarization direction, and the lines with short dashes indicate the light with the second polarization direction. The lines with circles and short dashes indicate the natural light. An optical axis of the birefringent layer 301 may be perpendicular to the first polarization direction and may have an angle of about 0 degrees to about 90 degrees with the second polarization direction. Correspondingly, the light valve 302 may control the polarization direction of the light incident to the birefringent layer 301 to be the first polarization direction at the first time, and the light from the sub-pixels 20 may be not shifted after passing through the pixel shift unit 30 to form the first display pixels 401. The light incident to the birefringent layer 301 may directly exit through the birefringent layer 301 and the light transmitting through the birefringent layer 301 may be first light with the first polarization direction, that is the natural light o corresponding to the birefringent layer 301. At the second time, the light valve 302 may control the polarization direction of the light incident to the birefringent layer 301 to be the second polarization direction at the first time, and the light from the sub-pixels 20 may be shifted after passing through the pixel shift unit 30 to form the second display pixels 402. The light incident to the birefringent layer 301 may exit through the birefringent layer 301 after being refracted and the light transmitting through the birefringent layer 301 may be second light with the second polarization direction, that is the abnormal light e corresponding to the birefringent. layer 301.