Patent ID: 7663714

Claim:
A backlight device for illuminating a transmissive color liquid crystal display panel, having a color filter, from a backside thereof with white light, said color filter being constituted by a tristimulus filter for wavelength-selecting and transmitting red light, green light and blue light, said backlight device comprising: a light source, made up by a red light emitting diode emitting red light with a half-value width hwr such that 15 nm≦hwr≦30 nm, a green light emitting diode emitting green light with a half-value width hwg such that 15 nm≦hwg≦50 nm and a blue light emitting diode emitting blue light with a half-value width hwb such that 15 nm≦hwb≦30 nm; and color mixing means for mixing the red light, green light and blue light emitted by said light source to generate said white light.