SEMICONDUCTOR PLANAR LIGHT SOURCE

摘要

PROBLEM TO BE SOLVED: To emit high brightness intermediate color or a mixed color for a semiconductor planar light source. SOLUTION: A fluorescent cover 8 to which phosphor has been applied is adhered to other main surface 1b of a light guide plate 1. Wavelength of irradiated light from a semiconductor light-emitting element 4 is converted via phosphors and discharged from the light guide plate 1. Brightness reduction due to converted wavelength can be suppressed to the minimum because light diffusion because of the phosphors inside the sufficiently thin film-shaped fluorescent cover 8 being comparatively small. Light having a wavelength different from that of the light emitted from a commercially available semiconductor light-emitting element can be obtained by means of the fluorescent cover 8. Lights of different wavelengths can be extracted easily by changing the fluorescent cover 8.