3D display device with adjustable grating layer

A 3D display device, comprising:

• a display panel;
• a first grating layer, located at a light exiting side of the display panel and comprising hole-like light-transmitting regions arranged in an array form and first light-shielding regions configured for separating adjacent hole-like light-transmitting regions of the first grating layer;
• a second grating layer, located over the first grating layer and comprising hole-like light-transmitting regions arranged in an array form and second light-shielding regions configured for separating adjacent hole-like light-transmitting regions of the second grating layer;
• and
• an adjusting device, configured to adjust a relative shift between the first grating layer and the second grating layer so as to realize switching between a 2D display state and a 3D display state,
• wherein, the hole-like light-transmitting regions included in the first grating layer correspond to the hole-like light-transmitting regions included in the second grating layer in a one-to-one correspondence relationship, pixel units arranged in an array form are provided within the display panel;
• in the 2D display state, an overlap region of projections of each pair of the hole-like light-transmitting regions on the display panel covers a region of at least one pixel unit;
• in the 3D display state, an area of an overlap region of projections of each pair of the hole-like light-transmitting regions on the display panel is smaller than an area of the region of one pixel unit.