Disclosed is a flat light source in which intensity of light emitted from sub-pixels is adjusted using color density distribution or color thickness distribution of a sub-pixel provided in the flat light source to minimize Fraunhofer diffraction. The flat light source is configured as such that an auxiliary flat light source has a color density distribution different from that of the sub-pixel and is inserted into the sub-pixel to constitute a pixel of a flat light source, such that intensity of light emitted from the auxiliary flat light source is stronger than intensity of light emitted from the sub-pixel in order to minimize intensity of light of second or higher order Fraunhofer diffraction patterns caused by the flat light source. Cleaner image is formed and a minute image can be realized.
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