US Patent 7934855 Flat light-emitting apparatus

A flat light-emitting apparatus includes a light-emitting element for radiating visible light consisting of a first-wavelength light with a wavelength substantially not less than 600 nm and a second-wavelength light with a wavelength substantially not greater than 480 nm, a wavelength conversion material for generating a third-wavelength light when irradiated by the second-wavelength light, a first color filter for the passing of the first-wavelength light, a second color filter for the passing of the second-wavelength light, and a third color filter for the passing of the third-wavelength light.