七十年代出现了多种光阀技术,获得了相当显著的成绩,但由于设备庞大、价值昂贵、维护复杂,使用范围受到一定的限制.近年来由于使用荧光粉的投影管技术、光学技术和银幕技术的飞速发展,使彩色大屏幕电视的水平出现了质的飞跃,无论是它的亮度、清晰度、色彩鲜艳的程度都有显著的提高,见表1.它的发展 Seventies appeared a variety of light valve technology, has achieved considerable success, but due to the huge equipment, expensive, complex maintenance, the use of a certain limit.In recent years due to the use of phosphor projection tube technology, optical technology and The rapid development of screen technology, the quality of large-screen color TV appeared a qualitative leap, whether it is the brightness, sharpness, the degree of colorful have a significant increase, see Table 1. Its development