投影幕常识（Projection screen）.doc

投影幕常识（Projection screen） Home theater projection curtain common sense Classification by function The projection curtain is divided into two types: reflection type and transmission type. The reflector is used for the forward projection and the transmission is used for rear projection. The positive projection is the projector with the viewer on one side; the rear projection is the projector with the viewer at both ends of the screen. Since the rear projection requires considerable space and is not suitable for ordinary families, it is recommended for the general family to use reflective projection screens. Proportional classification The commercial projection curtain is divided into two categories: 16:9 and 4:3. The projector is basically 16:9 display output format, while watching DVD, BD/HD-DVD are 16:9 or 2.35:1 wide screen, in order to get close to the cinema viewing experience, proposed uses the 16:9 home theater curtain, some super fancier in order to pursue the ultimate effect, will build the 2.35:1 screen with Panamorph lenses or the use of CRT gun. But if you watch TV programs based on 4:3, NTSC and PAL, you can also consider the 4:3 screen. Sort by installation It can be divided into four kinds: hand hanging curtain, electric hanging curtain, ground drawing curtain and frame curtain. Many famous screen manufacturers provide the same curtain material, but different installation methods of the curtain to meet the needs of consumers, consumers can choose according to their own economic conditions. Frame curtain Frame screen is the favorite of super fans. It doesnt appear. Like other three types of installation, it will be easier to fold and not be straight after use for a period of time, and provide a mirror like picture. Classification by material Curtain material is generally divided into textiles (including PVC) and metals, the following focuses on the most widely used textile category. Textile fabrics are usually divided into white screen and gray screen. Wh