以擴散片消除雷射微型投影機之光斑效應研究

Abstract

在本論文中，我們提出一個具有低光斑對比值、高對比度並同時維持系統效率的微型雷射投影機。消除光斑對比度值的方法為採用兩片擴散片與一個音圈馬達震盪器。隨著不同種類的第二擴散片，我們可以分成兩大類。在第一類裡，光斑對比值可以藉由圓對稱擴散片降低到2.8%。同時FO:FO對比度可以維持在1200:1~1300:1，系統效率減少1.5%。在第二類裡，光斑對比度值可以藉由橢圓對稱擴散片下降到6.49%。同時FO:FO對比度可以維持1300:1~1400:1，系統效率只減少1%

We proposed a LASER pico-projector of low speckle contrast value, high contrast ratio, and system efficiency maintained. The method of speckle contrast value reduction adopted two pieces of diffusers and a Voice Coil Motor (VCM) oscillator. With the different second diffusers for high contrast ratio and high system efficiency, we can divide into two categories. In the category 1, the speckle contrast value can be decreased to 2.8% by circular symmetric diffuser. In the meantime, the full-on/full-off (FO:FO) contrast ratio can be maintained 1200:1~1300:1, and the system efficiency decreases 1.5%. In the category 2, the speckle contrast value can be reduced to 6.495% with the elliptical symmetric diffuser. At the same time, the FO:FO contrast ratio can be maintained 1300:1~1400:1, and the system efficiency decreases only 1%.