Patent ID: 8023066

Claim:
A backlight module, comprising: a brightness enhancement unit comprising a first protective layer, a second protective layer, and a prism unit between the first and second protective layers; and a light emitting unit comprising a first electrode layer disposed adjacent to the second protective layer, a second electrode layer, and a light emitting layer between the first and second electrode layers; wherein the brightness enhancement unit and the light emitting unit are stacked one above the other, and the second protective layer covers the first electrode layer; wherein the prism unit has a refraction index n 0 , the first protective layer has a refraction index n 1 , the second protective layer has a refraction index n 2 , the refraction index n 1 is less than the refraction index n 2 , and the refraction index n 0 is between the refraction index n 1 and the refraction index n 2 .