背投是相对于前投(有时也称作直投影电视机)而言的。前投就像电影院放电影,观众和投影机在屏幕的同一侧,投影机将光信号投射到屏幕正面供人们观看:而背投电视机则不然,其投影设备和屏幕共同安装在一个较大的箱体内,由屏幕下方的投影设备将光信号先投射到屏幕后方的反射镜上,再反射投影到半透明屏幕的背面,故称作背投与前投相比较,背投影机有两大优点:一是对环境光线要求不高,即便在明亮的白天也能收看到清晰的电视图 Rear projection is relative to the former vote (sometimes referred to as direct projection television) in terms of. The former cast like a movie theater cinematography, the audience and the projector on the same side of the screen, the projector project the light signal to the front of the screen for people to watch: the rear projection TV is not the same, its projection equipment and screen installed together in a larger Of the box, the projection device at the bottom of the screen will be the first optical signal projected onto the mirror behind the screen, and then reflected projection to the back of the translucent screen, it is called the rear projection compared with the previous vote, there are two rear projector Advantages: First, less demanding on ambient light, even in bright daytime can see a clear picture of the TV