PROJECTION SCREEN

摘要

A projection screen capable of providing a clear and sharp image thereon without being affected by the brightness of a projection environment. The projection screen displays an image by projecting the narrow-band primaries wavelength band light, and includes on a screen substrate (2) an optical thin film (3) having a high reflection characteristic to the narrow-band primaries wavelength band light and a high transmission characteristic to the visible wavelength band light other than the aforementioned wavelength band light. In the projection screen, the optical thin film (3) plays a role as a so-called a band filter. That is, the optical thin film (3) functions as a narrow-band primaries wavelength band filter having the effect of particularly reflecting the narrow-band primaries wavelength band light and substantially transmitting the light of the other wavelength, thereby separating these two kinds of light.