Abstract
A suitable TFT structure for wide viewing-angle displays with in-plane switching mode of nematic LCs has been developed. The structure can be constructed by simplified process reduced the number of electrode layers, suppressing crosstalk generation which is essential for combining the IPS mode with TFTs. A practical aperture ratio was obtained in spite of the existence of interdigital electrodes in a pixel. It has also been adopted into a prototype which have a 10.4 inch diagonal display area with VGA resolution and which display 262,144 colors. This prototype has clarified that these display with the IPS mode have extremely wide viewing-angle characteristic exceeding the polar viewing-angle of 45 degrees satisfying contrast ratio more than 10 without gray-scale inversion in all azimuthal angles. In particular, the color shifting area is very slight in comparison with conventional TFT-LCDs with twisted nematic mode. It has been confirmed that IPS-TFT-LCDs are promising candidates for the next generation LCDs with wide viewing-angles and make it possible to replace CRTS in monitors and televisions.