Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-06-26
1994-04-12
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 58, G02F 1133
Patent
active
053030729
ABSTRACT:
An improved arrangement of a liquid crystal display device is provided in which the redundancy of a known but unwanted TFT (thin film transistor) defect is suppressed so that the yield per finished liquid crystal display device product can be increased without deterioration in the picture quality. Each pixel of the liquid crystal display device arranged at an intersection of one of scanning lines and one of signal lines is provided with two or three TFTs and also, a storage capacitor which is formed of a portion of a gate insulating layer and is sandwiched between its electrode and a preceding scanning line in the previous row using no extra masking procedure. The source, drain and gate electrodes of both the first and third TFTs are respectively coupled to the same signal line, the electrode of the same pixel and the adjacent scanning lines. The gate, source and drain electrodes of the second TFT are respectively coupled to the same scanning line to which the gate electrode of the first TFT is coupled, the electrode of the same pixel and the electrode of a succeeding pixel provided on the opposite side of the scanning line with respect to the same pixel. The arrangement also has a scanning driver circuit capable of activating two scanning lines at the same time for a sequential one-by-one scanning operation, whereby no fault in a reproduced image will be perceived in spite of the presence of a defective TFT.
REFERENCES:
patent: 4890097 (1989-12-01), Yamashita et al.
patent: 4936656 (1990-06-01), Yamashita et al.
"Capacitively-coupled TFT/LCD with minimized parasitic effects" IBM, vol. 31, No. 3, Aug. 1988, pp. 94-97.
Hotta Sadayoshi
Takeda Mamoru
Takubo Yoneharu
Tamura Tatsuhiko
Yamashita Ichiro
Mai Huy
Matsushita Electric - Industrial Co., Ltd.
Sikes William L.
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