Partial drive-type light source device and image display device using same

A partial drive-type light source device comprising:

• an excitation light source that is formed from a plurality of light-emitting elements and is partially drivable;
• a phosphor sheet disposed at a position separated from the excitation light source and containing a phosphor that converts at least part of a wavelength region of incident light from the excitation light source and releases emitted light in a wavelength region differing from the incident light;
• and
• a wavelength-selective reflection film that is disposed between the excitation light source and the phosphor sheet and that transmits at least part of light in the wavelength region of the incident light from the excitation light source and reflects at least part of light in the wavelength region of the emitted light from the phosphor sheet, wherein
• the phosphor sheet includes a phosphor layer and a protective film for protecting the phosphor layer, the phosphor layer being formed from a resin composition including the phosphor,
• the phosphor sheet and the wavelength-selective reflection film are in an integrated form to configure an integrated sheet, and
• in the integrated sheet, the protective film is disposed at one side of the phosphor layer, and the phosphor layer and the wavelength-selective reflection film are directly joined at the opposite side of the phosphor layer.