Display device having digital micromirror array with an increased display bit depth

A display device, comprising:

• a light source;
• a light modulator, wherein the light modulator comprises a digital micromirror array comprising a plurality of micromirrors, and is arranged on a light path of light emitted by the light source and configured to modulate the light emitted by the light source based on a target image and luminance of the light source to obtain a grayscale image;
• and
• a control apparatus, wherein the control apparatus is configured to control a driving current of the light source to adjust the luminance of the light source in different periods within a frame image, and to cause a driving current overdrive pulse of the light source during at least one of the periods, so that a display bit depth of the grayscale image increases from n to n+i and the periods correspond to bitplanes of the grayscale image in one-to-one correspondence, where n denotes an original display bit depth of the display device, i≥1 and i is an integer.