Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
2011-01-11
2011-01-11
Stahl, Mike (Department: 2874)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S046000, C438S158000
Reexamination Certificate
active
07868957
ABSTRACT:
As a wiring becomes thicker, discontinuity of an insulating film covering the wiring has become a problem. It is difficult to form a wiring with width thin enough for a thin film transistor used for a current high definition display device. As a wiring is made thinner, signal delay due to wiring resistance has become a problem. In view of the above problems, the invention provides a structure in which a conductive film is formed in a hole of an insulating film, and the surfaces of the conductive film and the insulating film are flat. As a result, discontinuity of thin films covering a conductive film and an insulating film can be prevented. A wiring can be made thinner by controlling the width of the hole. Further, a wiring can be made thicker by controlling the depth of the hole.
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Kanno Yohei
Maekawa Shinji
Yamazaki Shunpei
Costellia Jeffrey L.
Nixon & Peabody LLP
Semiconductor Energy Laboratory Co,. Ltd.
Stahl Mike
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