To establish a color reproducing range with a 100% or more NTSC (national television system committee) ratio.
The backlight device is equipped with a light source comprising a red light emitting diode 21R which emits red light having the peak wavelength λpr in the range of 625 nm≤λpr≤685 nm, a green light emitting diode 21G which emits green light having the peak wavelength λpg in the range of 505 nm≤λpg≤540 nm, and a blue light emitting diode 21B which emits blue light having the peak wavelength λpb in the range of 420 nm≤λpb 465 nm, and a color mixing means 23 to mix the read light, green light and blue light from the light source to produce white light. The emission light intensity is controlled to obtain 10,000±1,000K color temperature of the white light. The half value width hwr in the spectrum of the red light, the half value width hwg in the spectrum of the green light and the half value width hwb in the spectrum of the blue light are specified to the ranges of 20 nm≤hwr≤25 nm, 30 nm≤hwg≤40 nm and 25 nm≤hwb≤30 nm, respectively.
KAKINUMA KOICHIRO
NAKAEDA TAKEHIRO
HAGA SHUICHI
Eiichi Tamura
Seiji Iga