A gray scale display method is provided. The method includes: dividing a matrix arrangement taking a pixel unit as a display unit into a matrix arrangement taking a plurality of pixel units as the display unit, where the display unit including the plurality of pixel units is a pixel module, and the pixel unit includes at least one sub-pixel; in a case that an average gray scale of the pixel module is smaller than a preset value, displaying a part of the pixel units of the pixel module with a preset gray scale, where the preset gray scale is larger than the average gray scale.