Display device

A display device comprising:

• a color filter layer;
• an illumination device which illuminates the color filter layer with mixed color light including a first color component and a second color component;
• and
• a wavelength selection layer interposed between the illumination device and the color filter layer,
• wherein:
• the color filter layer includes a first color filter which transmits the first color component and absorbs the second color component and a second color filter which transmits the second color component and absorbs the first color component;
• the wavelength selection layer includes a phase element layer, a first polarizer interposed between the illumination device and the phase element layer, and a second polarizer interposed between the phase element layer and the color filter layer;
• the phase element layer includes a first color phase element located in a position corresponding to the first color filter and a second color phase element located in a position corresponding to the second color filter;
• the first color phase element changes a polarization state of the mixed color light, which strikes to the first phase element through the first polarizer, such that the first color component is transmitted through the second polarizer;
• and
• the second color phase element changes a polarization state of the mixed color light, which strikes to the second phase element through the first polarizer, such that the second color component is transmitted through the second polarizer.