| 摘要 |
In the display device, a light source unit, a louver, a transparent/scattering state switching element, and a transmissive liquid crystal panel are provided in sequence, an optical waveguide and a cone sheet are provided to the light source unit, and a light source is disposed on the side of the optical waveguide. The light-exiting surface of the optical waveguide is made flat, and a tilted surface that is tilted to the side of the light source with respect to the light-exiting surface is formed in a light diffusing surface. A flat plate is provided to the cone sheet, and a plurality of circular cones are arranged two-dimensionally on the light-incident surface of the flat plate. The central axes of the circular cones are parallel to each other. The transparent/scattering state switching element is capable of switching between a state for transmitting incident light and a state for scattering the light. By this configuration, a light source device is obtained having high directivity, high luminance, and no limitations on the mounting position of the light source.
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