Backlight unit and a liquid crystal display apparatus applying the same therein

A liquid crystal display apparatus, comprising:

• a liquid crystal panel;
• and
• a backlight unit for irradiating lights upon said liquid crystal panel, wherein said backlight unit has plural number of sets, each including at least one or more light sources and a light guidance plate for guiding said lights from said light sources to a side of said liquid crystal panel to be emitted therefrom, and wherein
• said light guidance plate includes an incident portion provided on one end side of said light guidance plate, upon which said lights from said one or more light sources are incident, a light emission surface, from which the lights incident upon said incident portion emit, and a diffusing light guidance portion, which is provided between said incident portion and said light emission surface, and
• when assuming that distance of said diffusing light guidance portion in a light propagating direction is “b”, width of said incident portion of said light guidance plate is “W”, a number of unit of the light sources corresponding to each of said light guidance plates is “N”, and a pitch of the light sources aligned in said incident portion is “P”, then the following condition is satisfied:
• W=P×N
• P/2/√3≦b≦P/2×√3.