unit 13 the bottom frame 14 is typically made of iron or another kind of metal the bottom frame 14 includes a rectangular bottom plate 141 a first side plate 142 a second side plate 143 and a third side plate 144 the three side plates 142 143 144 respectively extend up from the bottom plate 141 the first side plate 142 is opposite to the second side plate 143 the third side plate 144 connects with both the first side plate 142 and the second side plate 143 the bottom plate 141 has a rectangular through hole 145 at a corner thereof adjacent to the first side plate 142 and far from the third side plate 144 referring also to fig2 and fig3 a horizontal area of a middle portion of the through hole 145 is less than a horizontal area of each of an upper portion of the through hole 145 and a lower portion of the through hole 145 the backlight unit 13 includes a light guide plate lgp 15 for guiding light a linear lamp 16 adjacent to the light guide plate 15 a metal reflector 17 a pair of rubber stoppers 18 and a plastic frame 19 the lamp 16 can for example be a cold cathode fluorescent lamp ccfl the reflector 17 essentially surrounds three sides of the lamp 16 and reflects light radiating from the lamp 16 toward the light guide plate 15 the rubber stoppers 18 are engaged around two ends of the lamp.