Speckle Noise Evaluation and Reduction of an Edge-Lit Backlight System Utilizing Laser Diodes and an Optical Fiber
Speckle Noise Evaluation and Reduction of an Edge-Lit Backlight System Utilizing Laser Diodes and an Optical Fiber
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DOI：
10.1109/jdt.2009.2027612
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发表时间：
2009-11-01
影响因子：
--
通讯作者：
Inaba, Yuta
中科院分区：
文献类型：
--
作者：
Fujieda, Ichiro;Kosugi, Takashi;Inaba, Yuta
激光二极管允许人们建立一个非常薄，宽色域的侧光背光系统的直视液晶显示器。光纤用于将其光功率传输到光导中。连接到光纤的超声波发射器对于减少斑点噪声是有效的，因为引入的机械振动使随机干涉图案平均化。在实验中，我们建立了一个背光系统与绿色激光和评估斑点噪声通过拍摄照片的条件下，模仿人类的观察。通过打开超声发射器，激光固有的散斑对比度从17%降低到2%。
Laser diodes allow one to build a very thin, wide-gamut edge-lit backlight system for a direct-view liquid crystal display. An optical fiber is used to transfer its optical power into a light-guide. An ultrasound transmitter attached to the optical fiber is effective for reducing Speckle noise because the mechanical vibration introduced averages out the random interference patterns. In experiment, we built a backlight system with a green laser and evaluated Speckle noise by taking photographs under the conditions that mimicked human observation. The Speckle contrast intrinsic to the laser was reduced from 17% to 2% by turning on the ultrasound transmitter.