激光显示中光学系统研究

Optics for laser display

为了满足机械转镜扫描要求(转镜转速每分钟不少于3万转)及光束与水平信号的行场同步要求,提出采用面阵空间光调制器及多像素并行扫描方式。采用“面阵空间光调制器”对激光束进行选通和光强调制,使覆盖多像素的激光束在高速扫过面阵空间光调制器时,光强按视频图像的强弱进行调制,从而形成激光视频图像。由于采用了多像素并行扫描、新型二维扫描转镜和积分器光路,扫描速度大大降低,由每分钟几万转降低到3000转,解决了扫描式激光显示的技术瓶颈和激光干涉条纹问题,获得了很好的显示效果。

The planar-array spatial light modulator and multi-pixel parallel scanning mode were put forward to meet the requirements of the mechanical rotating mirror scanning and the linefield synchronization of the beam and horizontal signal. The planar-array spatial light modulator was adopted for the laser beam gating and light-intensity modulation, such that the light intensity of video images was modulated when the laser beam covering multi pixels scanned the planar-array spatial light modulator in high speed. Therefore, the laser video images were formed. Since the multi-pixel parallel scanning, a novel 2-D scanning rotating mirror and an integrator beam path were used, the scanning speed was reduced from 30 000 rpm to 3 000 rpm. This technology solved the difficulties in scanning laser display and eliminated the laser interference fringes.