With the present invention, cost of the backlight system using the surface mounted type of LEDs can be reduced, and even when the number of LEDs is reduced, it never occurs that {HEAD ~ brightness} of {TAIL ~ the LEDs} lowers to locally darken the illuminating surface and that brightness variations are generated 
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With the present invention , cost of the backlight system using the surface mounted type of LEDs can be reduced , and even when the number of LEDs is reduced , it never occurs that { HEAD ~ brightness } of { TAIL ~ the LEDs } lowers to locally darken the illuminating surface and that brightness variations are generated
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