Patent ID: 8575640

Claim:
A polarized white light emitting diode comprising: a reflection substrate; a transparent substrate having a first surface and a second surface opposing the first surface; a metallic wire-grid polarizing layer disposed under the transparent substrate and in contact therewith, wherein the metallic wire-grid polarizing layer and the reflection substrate form a cavity; a light emitting diode chip, disposed in the cavity, for providing a first color light; and a phosphor layer, covering over and around the LED chip, disposed in the cavity with an air gap between the phosphor layer and the metallic wire-grid polarizing layer, wherein a second color light is generated by the phosphor layer excited with the first color light, wherein the metallic wire-grid polarizing layer multiply reflects a portion of the first color light in plural directions in the cavity to produce secondary excitations; a polarized white light transmits through the metallic wire-grid polarizing layer by mixing another portion of the first color light and the second color light excited by the first color light; and the polarized white light is transmitted through the second surface of the transparent substrate; wherein the first color light includes a transverse magnetic wave and a transverse electric wave, the transverse electric wave is multiply reflected in plural directions by the metallic wire-grid polarizing layer between the phosphor layer and the air gap, and the polarized white light transmits through the metallic wire-grid polarizing layer by mixing the transverse magnetic wave with the second color light excited by the first color light; and wherein the reflection substrate has a first concave, a second concave connected with the first concave and a transparent layer, the first concave is disposed below the second concave, the light emitting diode chip is disposed in the first concave, the transparent layer is spread around the light emitting diode chip and the first concave is filled with the transparent layer, the phosphor layer covers the transparent layer and is disposed in the second concave, and the transverse electric wave is multiply reflected in the cavity.