Patent ID: 7321473
Filing Date: 2008-01-22
Classification: G02B

Abstract:
1. An aperture, comprising: a round filter portion, a transmission wavelength range of the round filter portion being equal to a combined wavelength range of a red light, a green light and a blue light; and a plurality of annular filter portions, comprising a first annular filter portion and a second annular filter portion, the first annular filter portion being located between the round filter portion and the second annular filter portion, a transmission wavelength range of the first annular filter portion being equal to a combined wavelength range of the red light and the green light, a transmission wavelength range of the second annular filter portion being equal to the wavelength range of the red light, the transmission wavelength range of the first annular filter portion being larger than the transmission wavelength range of the second annular filter portion, wherein the round filter portion and the annular filter portions form a round zone and the transmission wavelength range of the round filter portion is larger than the transmission wavelength range of the first annular filter portion and the second annular filter portion.