other monochromic light as such the r g and b monochromic light can be properly combined into white light and supplied to the lcd panel 103 more effectively as explained above an embodiment of the present invention by employing a corrugated reflector 117 having grooves with walls inclined at an angle u03b8 the r g and b monochromic light emitted from each light emitting device 111 can be improved hence the inclined angle u03b8 of the reflector 117 can be formed to have any appropriate angle as long as the r g and b monochromic light emitted from each light emitting device 111 is reflected in an improved manner however the reflector in the backlight unit 110 according to an embodiment of the present invention does not have to be formed with inclined sloped grooves as described above with reference to fig4 as shown in fig6 a corrugated reflector 617 having stepped portions may be provided underneath or below one or more light emitting devices 611 in such a case the stepped reflector 617 may be positioned underneath below the light emitting devices 611 in direct contact with as shown in fig6 or to have a gap distance therebetween in such a structure the rate in which the r g and b monochromic light emitted from the backlight 110 that is reflected by the stepped reflector 617 is decreased and thus the intensity of the light becomes weaker than that of the related art accordingly the r g and b monochromic light can be mixed combined in an improved manner and thus supplied to the lcd panel 103 as the white light more efficiently fig7 a and 7b show another embodiment of present invention as shown in fig7.