4.55-in. HDTV poly-Si TFT light valve for LCD projectors

摘要

A 4.55-in. HDTV (high-definition television) poly-Si TFTn(thin-film transistor) light valve with 960×1439 pixels for LCDn(liquid crystal display) projectors has been developed. This is thensmallest transmission-type HDTV TFT light valve yet produced, and it hasnan aperture ratio which is higher than 30% despite the use of anredundant TFT structure and sufficient storage capacity in the pixels.nOptimization of redundant poly-Si TFT circuits with sufficient storagencapacitance has realized excellent image quality suitable for HDTV.nLaser cutting and deposition technology make it possible to repair mostnof the defects in the TFT substrate before LCD assembly. The repairednpoints are reliable and have no effect on the image quality because theynare covered with passivation and alignment layers after repairing