Abstract: An illumination device and a projection system using the same. The illumination device includes two or more color channels each including one or more light sources for generating a color light. At least one of the color channels includes light sources of a first type for generating a first (narrow band) light and light sources of a second type for generating a second light. The dominant wavelengths of the first and second lights are within 50 nm of each other, and the width of the combined spectrum (sum of normalized spectra of the first and second lights) is greater than the width of the spectrum of the first light by at least 10 nm.

Abstract: A backlight source and a thinning method for the same are provided. The backlight source includes: a solid state light source array having a plurality of solid state light sources (1) distributed on the base, a light transmitting unit (3) arranged above the solid state light source array, and a plurality of light adjusting units (2) arranged between the solid state light source array and the light transmitting unit (3). The plurality of the light adjusting units (2) is arranged above the plurality of solid state light sources (1) to reflect the shallow angle incident light from the solid state light source (1), thus changes the light intensity distribution of the output light through the light transmitting unit (3) from the solid state light sources (1) from Lambertian distribution to main sides emission.

Abstract: A polarized light source comprises a light emitting source and a polarization conversion device. The polarization conversion device comprises a fixing device (107), and a transparent moveable carrier (104) having motion state with respect to the fixing device (107) and provided with light wavelength conversion material (103). The polarization conversion device further comprises a stationary polarization beam splitter (101) close to the moveable carrier for transmitting a portion of excited light from the light wavelength conversion material (103) to provide a polarized emitted light and reflecting the other portion back to the light wavelength conversion material (103). A filter (102) for reflecting the excited light and transmitting the light from the light emitting source can be disposed at the side of the moveable carrier opposite to the polarization beam splitter (101).