Patent ID: 7324174

Claim:
A backlight device in which a plurality of light emitting units, each mounting many light emitting diodes on the same co-axial line on one surface of an interconnection substrate, are mounted on the same co-axial line to form a light emitting array, a plurality of said light emitting arrays are arranged at equal intervals on the back surface of a light transmitting liquid crystal panel, and in which the light radiated from said light emitting diodes are supplied through an optical sheet block to said liquid crystal panel to illuminate said liquid crystal panel, said backlight device comprising a heat radiating plate formed of a metal material exhibiting heat conductivity and having a substrate fitting part for arraying a plurality of said interconnection substrates side-by-side on the same coaxial line on a major surface of the heat radiating plate base having upstanding reflecting plate supports formed as one therewith and extending along the lateral sides of said substrate fitting part; a plurality of reflective sheet pieces each being formed of a sheet material exhibiting reflecting characteristics as a rectangular piece of a length corresponding to the length of said preset number of said light emitting diodes and a width smaller than the width of said heat radiating plate, each of said reflective sheet pieces including a plurality of guide through-holes through which are passed light emitting parts of said light emitting diodes; and a reflecting plate formed from a plate material exhibiting reflective characteristics to an outer shape approximately equal to the outer shape of said liquid crystal panel, said reflecting plate having a plurality of rows of guide openings in register with said light emitting arrays and through which are passed the light emitting parts of said light emitting diodes; said reflecting sheet pieces being mounted to said heat radiating plates as the light emitting parts of said light emitting diodes are protruded via those of said guide through-holes facing said light emitting parts, said reflecting plate being superposed on said reflective sheet pieces and bonded in this state to said reflective plate supports of said heat radiating plates, in a manner that the light emitting diodes protruded through said guide through-holes of said reflective sheet pieces are protruded through said guide openings to face the back side of said liquid crystal panel.