A planar light source

摘要

The invention provides a planar light source comprising
€ƒ€ƒ€ƒ an LED emitting a blue light,
€ƒ€ƒ€ƒ a coating comprising a fluorescent material for absorbing a part of the blue light and converting the absorbed blue light to a light having a wavelength different from the wavelength of the blue light, and
€ƒ€ƒ€ƒ an optical guide plate,
€ƒ€ƒ€ƒ wherein said optical guide plate accepts the converted light mixed with unabsorbed blue light from the LED through the coating at an end face of the optical guide plate and emits the mixed light from a principal plane of the optical guide plate in a planar state.