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最近背投影电视的价格在大幅度下降,使其日见走俏,受到要求大画面的家庭影院爱好者的关注。现市面上绝大多数背投电视属于CRT型,成像元件为高亮度、小尺寸投影管,整机由电子电路、投影管和光学投影系统三大部分组成。一般用三只七英寸阴极射线管作为投影管,经三基色透镜过滤后分别产生红色(R)、绿色(G)和蓝色(B)三幅单色图像,经透镜投射在投影屏幕上,叠加起来合成一幅彩色图像。
The price of rear-projection TVs has dropped dramatically recently, making them popular on a daily basis and aroused by the attention of home theater enthusiasts who demand large screens. Now the vast majority of rear projection TVs belong to the CRT type, imaging components for high brightness, small size projection tube, the whole by the electronic circuit, projection tube and optical projection system composed of three parts. Generally, three seven-inch cathode ray tubes are used as projection tubes. Three color images of red (R), green (G) and blue (B) are respectively filtered through three primary color lenses and projected onto the projection screen through a lens. Stack up to make a color image.