Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
1998-01-08
2001-03-06
Parker, Kenneth (Department: 2515)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S135000
Reexamination Certificate
active
06198521
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device. More particularly, the present invention is related to a liquid crystal display device including electrodes on an upper substrate connected to electrodes on a lower substrate.
2. Discussion of the Background
A liquid crystal display cell includes two transparent substrates each having driving electrodes on the inner side of the substrate. The substrates are spaced apart substantially in parallel to each other forming a gap between the substrates. In addition, the gap between the two substrates contains a liquid crystal body.
A problem with a conventional liquid crystal display is that the cell gap of the liquid crystal display does not have a proper thickness because the connection of the electrodes by a sealing agent cause the liquid crystal cell to be weighted vertically. That is, the mask weight is distributed in a center of the substrates which causes uneven and undesired cell gap thicknesses, as shown, for example, in FIG.
4
.
SUMMARY OF THE INVENTION
Accordingly, one object of this invention is to provide a novel liquid crystal display device in which the cell gap of the liquid crystal display maintains a predetermined thickness.
To achieve this object, the present invention provides a liquid crystal display device including a first transparent substrate having a contact hole, a second transparent substrate spaced apart substantially in parallel from the first transparent substrate to form a gap, and a liquid crystal body filling the gap between the first transparent substrate and the second transparent substrate. The first transparent substrate includes first driving electrodes and the second transparent substrate includes second driving electrodes and connection electrodes which pass through the contact hole of the first transparent substrate. In addition, the device includes external electrodes which connect to the second driving electrodes and connection electrodes through the contact hole of the first transparent substrate. The connection electrodes on the second transparent substrate are also connected to the first driving electrodes of the first transparent substrate at a location which is close to an edge of the contact hole.
REFERENCES:
patent: 5625474 (1997-04-01), Aomori et al.
patent: 5861929 (1999-01-01), Spitzer
patent: 04365015 (1992-12-01), None
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Parker Kenneth
Ricoh & Company, Ltd.
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