Backlight device and liquid crystal display apparatus

A liquid crystal display apparatus comprising

• a light transmitting liquid crystal panel;
• a backlight section including a plurality of light emitting arrays arranged at equal intervals on one surface of an interconnection substrate, each light emitting array being composed of a plurality of light emitting units made up of a plurality of light emitting diodes mounted on the same co-axial line, said backlight section sending out light radiated from said light emitting diodes towards said liquid crystal panel as illuminating light;
• an optical converting section arranged between said liquid crystal panel and said backlight section, and formed by a laminate of a plurality of functional optical sheets for processing said illuminating light supplied from said backlight section with preset optical conversion to send the so converted illuminating light to said liquid crystal panel;
• a light conducting section including a light diffusing light guide plate for diffusing said illuminating light to send the so diffused light to said liquid crystal panel and a light diffusing plate for performing light reflection/diffusion and light transmission on said illuminated light for equalizing the brightness to supply the resulting illuminating light to said diffusing light guide plate;
• a reflecting section for reflecting said light radiated from said light emitting diodes of said backlight section to the surrounding and said illuminating light reflected by said light diffusing plate towards said light conducting section;
• and
• a heat radiating section having a heat radiating plate formed of a metal material having heat conductivity in which a major surface of the heat radiating plate base is formed with a substrate fitting part for carrying said interconnection substrates side-by-side on the same co-axial line in the lengthwise direction and in which said substrate fitting part is formed as one with reflective plate supports along the lateral sides of said substrate fitting part;
• and
• a reflecting plate including a plurality of reflective sheet pieces and a reflecting plate, said reflective sheet pieces each being formed from a sheet with reflecting properties to the shape of a rectangle having a length corresponding to a preset number of said light emitting diodes and a width smaller than the width of said heat radiating plate, said reflective sheet pieces each being provided with a large number of guide through-holes on the same axial line, through which are passed the light emitting pars of said light emitting diodes, said reflecting plate being formed by a plate member formed to an outer shape approximately equal to that of said liquid crystal panel, said reflecting plate having a plurality of rows of guide through-holes through which are passed light emitting parts of said light emitting diodes, said rows being each registering with said light emitting arrays;
• said reflecting sheet pieces being mounted from one light emitting unit to another as said light emitting parts of said light emitting diodes are protruded through said guide through-holes facing the light emitting parts;
• said reflecting plate being superposed on said reflective sheet pieces and bonded to said reflective plate supports of each heat radiating plate as said light emitting diodes protruded from said guide through-holes are protruded through said guide openings.