This research approach the study of luminance and uniformity characteristics with new invented secondary optical lens, we called it as “lightguide-diffusive component”, with wide emission angle is designed for thin direct LED backlight . The LED backlight module composes ,at least, a part of “light source”, a secondary “lightguide-diffusive component “, a FPC for LED lighting and a new designed micro-structure reflective bottom surface on “lightguide-diffusive component “. Through the new designed lightguide-diffusive component , the emission profile of a single LED is modified to the situations of more illuminant and more uniformity. This new designed secondary optical lens is shaped as module type to cover the LED array results in a more uniform spatial light energy distribution on the emission plane of LED backlight. The new invented in this research thereto being apply the invention-patent of R.O.C.