Patent ID: 7872706

Claim:
A polarized light-emitting device, comprising: a light source for emitting blue light having a wavelength λ, wherein the wavelength λ=470 nanometers; a first optical thin film disposed at the light-emitting side of the light source, having a thickness d 1 and a height h 1 , and comprising a plurality of first geometric units having a width a 1 , wherein 0.2≦d 1 /a 1 ≦2; and a second optical thin film covering the first optical thin film, having a thickness d 2 and a height h 2 , and comprising a plurality of second geometric units having a width a 2 , wherein 0.2≦d 2 /a 2 ≦2; wherein the first geometric unit and the second geometric unit is repeatedly arranged along a first direction; and wherein a 1 =a 2 =200 nm, d 1 =90 nm, d 2 =76 nm, and h 1 =h 2 =140 nm.