Optical Lens Design for LED Backlights

摘要

The optical lens with wide emission angle is designed for thin direct LED backlight and large LED pitch. Through the refraction of two interfaces on the optical lens, the emission profile of a single LED is modified from Lambertian to bat-wing type. This new angular light energy distribution results in a more uniform spatial light energy distribution on the emission plane of LED backlight. The dark bands between LED light bars due to large LED pitch and thin backlight cavity can therefore be eliminated.