Display substrate with bragg reflection unit for each of the display units of at least three primary colors

A display substrate, comprising display units of at least two different colors, characterized in that,

• a first display unit of the display units corresponds to one of the at least two different colors, a second display unit of the display units corresponds to the other one of the at least two different colors and the first display unit is different from the second display unit,
• the display substrate further comprises bragg reflection units located in different regions corresponding to respective display units,
• each of the bragg reflection units comprises a first structural layer and a second structural layer which are alternately stacked with each other and have different refractive indexes, and
• each of the bragg reflection units is configured according to the color of a corresponding display unit so that a bragg reflection unit corresponding to the first display units and a bragg reflection unit corresponding to the second display unit have different thicknesses, wherein, in each bragg reflection unit, thickness of the first structural layer is ¼n1 of wavelength of incident light having the color of the corresponding display unit, wherein n1 is refractive index of the first structural layer;
• and thickness of the second structural layer is ¼n2 of wavelength of incident light having the color of the corresponding display unit, wherein n2 is refractive index of the second structural layer.