convenience of fixing referring to fig1 the diffuser 130 and the prismatic plates are integrated into a unit the direct type backlight module 100 of the present invention is not limited to utilize the independent dedicated light compensating elements 140 and total reflection prism 39 s structures 130 a can also be adopted and directly formed in some regions of the diffuser 130 wherein those regions correspond to the positions between any two neighboring ccfls 120 the total reflection prism 39 s structure 130 a is equivalent to the prisms 142 of the prismatic plate in the aforementioned embodiment and via the total reflection prism 39 s structures 130 a the light is guided to some regions of the diffuser 130 wherein those regions correspond to the positions between any two neighboring ccfls 120 in order to compensate the brightness defects occurring between any two neighboring ccfls 120 fig1 is a schematic diagram of the brightness values measured at several points in a conventional direct type backlight module fig1 is a schematic diagram of the brightness values measured at several points in the direct type backlight module of the present invention comparing fig1 with fig1 it is obvious that each of the values measured at point 1 to.