光学信息处理中TFT-LCD像素结构衍射的干扰

Disturbance of the diffraction of TFT - LCD Pixels Structure on Optical Information Processing

薄膜晶体管液晶显示器TFT-LCD是信息光学研究中一种非常重要的电寻址空间光调制器SLM。TFT—LCD像素之间导电沟道上不透明的金属掩膜的周期性分布形成矩形光栅,引起衍射,在光学信息处理中相邻衍射级间傅立叶谱的部分重叠,引起了相互干扰,这形成了TFT—LCD较好地用于信息光学研究的空间频率上限;理论分析表明,在谱平面,各衍射级的谱的相对分布是相同的。并通过联合变换实验加以证实。

TFT-LCD is a very important spatial light modulator in optical information processing. The matrix of TFT -LCD is constructed with a metal mask that covers the inter - pixel spaces, obscuring the thin fihn transistors and preventing light leakage through the unswitched parts of the panel. It result in diffraction. The overlap of adjacent order of diffraction limited the spatial frequency used in optical information processing with TFT - LCD. The analysis shows that the relative amplitude spatial distributings of different diffraction orders are same. This has been checked by the experiment of JTC.