Lighting device using wavelength conversion sheet, and display device using the same

A lighting device comprising:

• a plurality of light sources arranged side by side in a plane;
• and
• a wavelength conversion sheet arranged to face a light emitting surface of each of the plurality of light sources and converting a wavelength of light from the plurality of light sources,
• wherein the wavelength conversion sheet includes:
• a base material having transparency, and
• a wavelength conversion layer, in which a plurality of protrusions containing a wavelength conversion material and having a spherical surface, is arranged side by side without gaps on a principal surface of the base material opposite the plurality of light sources,
• the wavelength conversion layer is provided on each of a pair of principal surfaces of the base material, and
• centers of the plurality of protrusions in a plan view are arranged at different positions in the wavelength conversion layer provided on one of the pair of principal surfaces and the wavelength conversion layer provided on another one of the pair of principal surfaces.