Display device and method for adjusting chromaticity of display beam

A display device, comprising:

• a light source module includes a light source, the light source is used for providing a light beam, and an illumination beam is formed by the light beam through the light source module, wherein a chromaticity of the light beam falls within a first region in the CIE 1931 xy chromaticity coordinates, the first region is a region enclosed by four coordinate points, and values of the four coordinate points of the first region are (0.2535, 0.2160), (0.2656, 0.2590), (0.2795, 0.2590), and (0.2674, 0.2160), respectively;
• a viewing angle switching module, located on a transmission path of the illumination beam, and comprising:
• a first polarizer;
• a viewing angle adjusting layer;
• and
• a second polarizer, wherein the viewing angle adjusting layer is located between the first polarizer and the second polarizer;
• and
• a display module, located on the transmission path of the illumination beam, and comprising:
• a display layer;
• and
• a third polarizer, wherein the display layer is located between the second polarizer and the third polarizer, and a display beam is formed by the illumination beam through the display module and the viewing angle switching module,
• wherein a chromaticity of the display beam falls within a standard region in the CIE 1931 xy chromaticity coordinates, the standard region is a region enclosed by four coordinate points, and values of the four coordinate points of the standard region respectively are (0.343, 0.359), (0.283, 0.359), (0.343, 0.299) and (0.283, 0.299) when the display beam is a white light.