To provide a display switching between a private display mode with a narrow view angle and a public display mode with a wide view angle by a lighting system.

The lighting system is equipped with a first waveguide board 25, a plurality of light guide surfaces 29, 30 are provided on a bottom surface of the first waveguide board 25. The surfaces 29, 30 make light to be faced towards at least one angle range through an output surface 31 of the waveguide board 25, on the other hand, the light to be hardly faced to a different angle range. Each of the surfaces 29, 30 is equipped with a plurality of parts 32-32, and these parts have different inclined angles to a perpendicular axis of the waveguide board 25.