双光束扫描激光电视系统设计

阐述了双光束扫描激光电视系统的设计,系统采用两束激光(每束都由红、绿、蓝三基色配比而成)通过一个扫描头同时扫描,扫描头的行偏转采用多面转镜、场偏转采用电流计偏转实现,与单束扫描方式相比较有如下优点:1.多面转镜的转速可降至1/2,提高了扫描装置的性能,同时降低了光学扫描系统制作难度;其转镜镜面尺寸和出射光束直径可以相应加大,扫描光斑在屏幕上聚焦更好,图像显示更清晰;2.两组调制器同时工作,屏幕水平分辨率可提高2倍;3.在相同的屏幕亮度下,单点功率密度相应降低,提高了安全性。

Laser television with two-beam scanning

The design and priciples of a laser television with two-beam scanning are described. The system employs 2 laser beams, each being composed of red, green and blue components. The two beams from one scanner are scanned simultaneously by a rotating polygonal mirror for horizontal deflection and by a galvanometer for vertical deflection. Compared with conventional signal-beam scanning, the new design has the following advantages:(1)The rotational speed of the polygonal mirror can be reduced by a factor of 2, which will improved the system performance and decrease the difficulty of the manufacture of the system. The size of the polygonal facet and,therefore, the laser beam diameter can be increased, which will decrease the pixel diffusion. (2)The simultaneous operation of the 2 modulators will improve the horizontal resolution by a factor of 2.(3)for the same screen brightness, the single pixel power density can be reduced by a factor of 2, which will decrease the hazardous laser radiation.