Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Patent
1996-08-14
1998-07-07
Dang, Hung X.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
349129, 349144, G02F 1133, G02F 11343
Patent
active
057777004
ABSTRACT:
A liquid crystal display having satisfactory visibility in a wide viewing angle range is provided. A TFT array substrate of the liquid crystal display includes scanning electrodes and signal electrodes arranged in a matrix shape, thin-film transistors respectively disposed at intersections between the scanning electrodes and the signal electrodes, first pixel electrodes respectively connected to the signal electrodes via the thin-film transistors, connecting capacitor electrodes formed in a layer including gate electrodes of the thin-film transistors, and second pixel electrodes capacitively connected to the first pixel electrodes via the connecting capacitor electrodes. It is not necessary to use any additional process to form the second electrodes, leading to advantages that the product yield is improved and production cost is lowered. Each pixel is divided into plural areas having different directions of orientation and into plural areas being applied with different voltages. Due to existence of the areas having different directions of orientation, there is attained a vertically symmetric transmittivity characteristic. Moreover, adjusting the surface ratio and the application voltage ratio between the areas to be applied with different voltages, there are attained an advantageous effect that viewing angle dependence is relaxed in the low gradation presentation and visibility is improved.
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Hatada Yoriko
Kaneko Setsuo
Sumiyoshi Ken
Dang Hung X.
NEC Corporation
Parker Kenneth
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