Development of Wide-Viewing-Angle TFT-LCDs using halftone gray-scale method

We have developed wide-viewing-angle TFT-LCDs using the halftone gray scale (HTGS) method. Compared with conventional TN-LCDs, the viewing angle of HTGS TFT-LCDs is twice as wide in the up-down direction and has also greatly improved in the diagonal direction. The gray-scale display response time of HTGS TFT-LCDs is also shorter by one-half compared with conventional TN-LCDs. We have studied the application of HTGS TFT-LCDs to passenger cabin entertainment use. In contrast to consumer use, environmental durability characteristics are required; however, the developed HTGS TFT-LCDs meet all of the requirements and have been practically used. This paper presents the principles of HTGS, the pixel design, the device structure, the electro-optical characteristics, and the application to passenger cabin entertainment. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 2, 80(5): 89–98, 1997