Light-emitting device and display

A display comprising:

• a light source, including a waveguide-type red semiconductor light-emitting element emitting a red beam, a waveguide-type green semiconductor light-emitting element emitting a green beam and a waveguide-type blue semiconductor light-emitting element emitting a blue beam, so formed that the width of a waveguide of said semiconductor light-emitting element emitting a beam of a relatively short wavelength is rendered larger than the width of a waveguide of said semiconductor light-emitting element emitting a beam of a relatively long wavelength in at least two semiconductor light-emitting elements among said red semiconductor light-emitting element, said green semiconductor light-emitting element and said blue semiconductor light-emitting element;
• and
• modulation means modulating said beams emitted from said light source.