Spread illuminating apparatus having light reflecting sheet with light diffusing portions

摘要

A spread illuminating apparatus is provided which includes: a light conductive plate having a light entrance surface and a light exit surface; a plurality of LEDs disposed at the light entrance surface of the light conductive plate; a light reflecting sheet disposed at the light exit surface so as to cover a portion of the light conductive plat located close to the side surface and also the LEDs, and a plurality of light diffusing portions disposed at the light reflecting sheet so as to cover respective LEDs. Lights leaking from the LEDs are diffused by the light diffusing portions thus preventing the brightness variation at the areas closed to the LEDs, and the leakage lights are reflected by the light reflecting sheet into the light conductive plate so as to be efficiently utilized thus achieving an enhanced brightness across the light exit surface of the light conductive plate.