In one embodiment, a display panel includes: a first polarization sheet, a second polarization sheet and a liquid crystal box between the first polarization sheet and the second polarization sheet. The display panel further includes: a control electrode layer and a control module; wherein the control electrode layer is provided to the liquid crystal box, the control electrode layer comprises a plurality of separated strip electrodes, a preset pitch that satisfies a requirement of grating formation is formed between adjacent strip electrodes, and transmittances of the strip electrodes are changeable under voltage. The control module is coupled to the strip electrodes and is configured to output a voltage to the strip electrodes to change the transmittances of the strip electrodes such that the control electrode layer becomes a grating or is totally transparent.