Projector screen
Projectors provide images by generating the image in an image forming unit and projecting the same onto a screen. The projectors are classified into front projection projectors and rear projection projectors according to the method of magnifying and projecting an image onto a screen. In the operation of an image projection system, an image is projected from an image source to a screen, and the projected image is viewed by a viewer in front of the screen. When there are a large number of viewers, they must be positioned in many positions in front of the screen. Projector screens used for projectors fall into two types: a transmission type wherein projection lights are illuminated from the rear side of the projection screen and seen at the front side; and a reflection type wherein projection lights are illuminated from the front side of the projection screen, and the reflected lights are seen at the front side. Projection screens can be used to reflect a variety of projected images. To improve the image quality, screens often include a reflective region surrounded by a light-absorbing border, such as a black material, to enhance the contrast between the projected image and ambient or secondary light. Typical materials for projection screens for use in such conventional projection systems include white-colored paper or cloth materials, and plastic films coated with white inks that diffuse light. Besides, high-quality projection screens that comprise diffusing layers containing beads, pearlescent pigments capable of controlling the diffusion of imaging light, are also available.
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