From: Illumination optics design for DMD Pico-projectors based on generalized functional method and microlens array
Parmeters
Value
LED areas
2.09 mm × 1.87 mm
LED Luminous angle θ
120°
Material
Polycarbonate
Index of refraction
1.59132
Target surface areas
10 mm × 10 mm
Output angle γ
12°