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    • 1. 发明授权
    • Projection system using high-frequency drive modulation to reduce perceived speckle
    • 投影系统采用高频驱动调制来减少感觉到的斑点
    • US07972008B2
    • 2011-07-05
    • US12255639
    • 2008-10-21
    • Witold R TellerAlban N LescureMark O. Freeman
    • Witold R TellerAlban N LescureMark O. Freeman
    • H04N5/74
    • H04N9/3129
    • An image producing system (1400) delivers images (1414) having reduced speckle by employing one or more drive circuits (1404, 1405, 1406) that deliver both a direct current drive signal (205) and an alternating current drive signal (405) to one or more lasers (1401, 1402, 1403). Specifically, an alternating current drive circuit (403) is used in conjunction with a direct current drive circuit (203) to modulate a drive signal. The modulation can be at a frequency of between 400 MHz and 600 MHz. When lasers, such as the red laser (1401) or the blue laser (1403) of a multi-laser system are modulated in such a fashion, their emitted spectral widths (407) greatly expand, thereby reducing speckle in projected images (1414).
    • 图像产生系统(1400)通过采用一个或多个传送直流驱动信号(205)和交流驱动信号(405)的驱动电路(1404,1405,1406)来传送具有减少的斑点的图像(1414), 一个或多个激光器(1401,1402,1403)。 具体地,交流驱动电路(403)与直流驱动电路(203)结合使用以调制驱动信号。 调制可以在400MHz和600MHz之间的频率上。 当以这种方式调制激光器(例如多激光系统的红色激光器(1401)或蓝色激光器(1403))时,其发射的光谱宽度(407)大大地扩大,从而减少投影图像中的斑点(1414) 。