Backlight unit and liquid crystal device using backlight units

A backlight unit comprising:

• a plurality of light sources whose luminescent chromaticities are different mutually;
• and
• a light guide plate for receiving lights emitted from said plurality of light sources and emitting the lights in a predetermined direction,
• wherein said plurality of light sources include one fluorescent tube arranged at a position closer to said light guide plate than the other light sources, and a green color fluorescent tube arranged at a position remote from said one fluorescent tube relative to said light guide plate.

A backlight unit comprising:

• a plurality of light sources whose luminescent chromaticities are different mutually;
• a light guide plate for receiving lights emitted from said plurality of light sources and emitting the lights to a predetermined direction;
• and
• a filter interposed between at least one light source of the plurality of light sources and said light guide plate to limit a wavelength of a transmitted light.

A backlight unit comprising:

• a plurality of light sources whose luminescent chromaticities arc different mutually;
• a light guide plate for receiving lights emitted from said plurality of light sources and emitting the lights in a predetermined direction;
• and
• lighting circuits for controlling a luminance of at least one light source of said plurality of light sources independently from luminances of the other light sources.

A backlight unit comprising:

• a plurality of light sources including a white color fluorescent tube, a red color fluorescent tube, a green color fluorescent tube, and a blue color fluorescent tube;
• and
• a light guide plate for receiving lights emitted from said plurality of light sources and emitting the lights in a predetermined direction,
• wherein said plurality of light sources are arranged independently on four different side surfaces of said light guide plate respectively.

A liquid crystal display device comprising:

• a liquid crystal panel;
• a backlight unit for illuminating said liquid crystal panel having a plurality of light sources including a white color fluorescent tube, a red color fluorescent tube, a green color fluorescent tube, and a blue color fluorescent tube,
• wherein said backlight unit includes a plurality of light sources whose luminescent chromaticities are different mutually;
• and
• a light guide plate for receiving lights emitted from said plurality of light sources and emitting the lights in a predetermined direction,
• wherein said white color fluorescent tube is arranged at a position closer to said light guide plate, than said other color fluorescent tubes.

A liquid crystal display device comprising:

• a liquid crystal panel;
• and
• a backlight unit for illuminating said liquid crystal panel from a back surface side,
• wherein said backlight unit includes a plurality of light sources whose luminescent chromaticities are different mutually;
• a light guide plate for receiving lights emitted from said plurality of light sources and emitting the lights in a predetermined direction;
• and
• a filter interposed between at least one light source of the plurality of light sources and said light guide plate to limit a wavelength of a transmitted light.