A light-guide-plate structure has a light guide plate, an LED module disposed on at least one side of the light guide plate, and a reflection member disposed between the LED module and the light guide plate. The LED module includes a circuit board and a plurality of LEDs arranged on the circuit board. The reflection member covers the side and a bottom surface of the light guide plate. The reflection member has a plurality of openings corresponding to the LEDs of the LED module in order to enable the LEDs to face the side of the light guide plate.