Patent ID: 9291884
Filing Date: 2016-03-22
CPC Classification: G03B,H04N

Claim Text:
1. A method of regulating light wavelength for a projection device, comprising the steps of: providing a single-color light source emitting a first chromatic light; forming a phosphor layer on an optical pathway of the single-color light source, so that the first chromatic light transmits the phosphor layer, wherein the phosphor layer comprises a phosphor material, having a chemical formula of Ba transforming a part of the first chromatic light to a second chromatic light through the phosphor layer, and emitting the residual first chromatic light, to wherein the wavelength of the second chromatic light is longer than the wavelength of the first chromatic light; and mixing the residual first chromatic light and the second chromatic light to generate a third chromatic light, wherein the wavelength of the third chromatic light is between the first and the second chromatic lights, and the wavelength of the third chromatic light is regulated by adjusting the proportion of the luminous intensity of the residual first chromatic light and the second chromatic light.