Liquid-crystal display device employing a common electrode consi

Details Liquid-crystal display device employing a common electrode consi Liquid-crystal display device employing a common electrode consi

1988-07-29

1989-09-26

Miller, Stanley D.

350339F, 350333, 350334, G02F 113, H01L 2978

Patent

active

048695769

ABSTRACT:
A liquid-crystal cell is formed with first and second transparent substrates opposing each other and a liquid crystal sealed therebetween. A plurality of display electrodes are formed in a matrix arrangement with rows and columns on the inner surface of said first transparent substrate. Gate bus lines are formed on the first transparent substrate along the respective rows of display electrodes. Source bus lines are formed on the first transparent substrate along the respective columns of display electrodes. Thin-film transistors are formed on the first transparent substrate at the intersections of a gate and source bus lines. The thin-film transistors each have a gate electrode connected to the associated gate bus line, a source electrode connected to the associated source bus line and the drain electrode connected to the corresponding display electrode. A common electrode is formed on the second transparent substrate such that it faces the display electrodes. The opposed sides of the source and drain electrodes of each thin-film transistor are constituted by tapered surfaces with the distance therebetween progressively decreased as they approach the first transparent substrate. Ohmic contact layers are formed on these tapered surfaces. A semiconductor of each thin-film transistor is formed over the source and drain electrodes via the ohmic contact layers.

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