Device for diffusing light 100 light-guiding unit 101, an optical input means (102) , and a light output means 103 . Optical input means ( 102, 202 ) and light output means ( 103, 203 ) is connected to a light guide portion ( 101,201,401,501 ) , and the light diffusing device 100 , a light source (108, 109 , 110) holding at least two separate light frequency from the input means (102) through the entrance to the light guide portion 101 and is disposed so as to propagate through the light guide portion 101 is emitted from the light output means 103 , and the light guide portion 101 is a columnar light to be propagated by a distance greater than the outer dimensions of the light guide portion 101 before it reaches the light output means 103 , thereby mixing the light from the at least two frequencies, . There is also disclosed a display device embodying the present invention .
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