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Liquid crystal display device provided with auxiliary circuitry for reducing electrical resistance
| Details |
Inventors: Koyama, Jun; Ohtani, Hisashi; Ogata, Yasushi; Yamazaki, Shunpei;
Assignee: Semiconductor Energy Laboratory, Inc. (Kanagawa-Ken, JP)
Primary Examiner: Picard; Leo P.
Assistant Examiner: Duong; Hung Van
Attorney, Agent or Firm: Fish & Richardson P.C.
A wiring line to which a high-frequency signal is applied is electrically connected in parallel to an auxiliary wiring line via a plurality of contact holes. The contact holes are formed through an interlayer insulating film and arranged in vertical direction to the wiring line. Since the auxiliary wiring line is formed in the same layer as an electrode that constitutes a TFT, the electric resistance of the wiring line can be reduced effectively and waveform rounding of an applied high-frequency signal can be reduced without increasing the number of manufacturing steps. |
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DETAILED DESCRIPTION The present invention has been made to solve the above problems, and an object of the invention is therefore to reduce, without increasing the capacitance, the electric resistance of wiring lines to which a high-frequency signal of several megahertz to tens of megahertz or an even higher frequency in an integrated circuit using TFTs that are formed on a relatively large substrate having an insulating surface, particularly a peripheral circuits integration type liquid crystal display device.
To attain the above object, according to one aspect of the invention, there is provided a semiconductor device in which a circuit using a thin-film transistor having an active layer that is constituted of a crystalline silicon film is provided on a substrate having an insulating surface, wherein at least part of at least one of wiring lines that are connected to the circuit and/or wiring lines in the circuit is electrically connected in parallel to an auxiliary wiring line that is provided with an interlayer insulating film interposed in between.
The above configuration is particularly effective when a high-frequency signal is applied to the at least one wiring line.
The above configuration is particularly effective when the circuit constitutes a peripheral circuit of a peripheral circuits integration type liquid crystal display device.
According to another aspect of the invention, there is provided a manufacturing method of a semiconductor device which method is applied to forming, on a substrate having an insulating surface, an active layer that is constituted of a crystalline silicon film and a thin-film transistor having a plurality of electrodes that are insulated from each other by an interlayer insulating film, the manufacturing method comprising the steps of forming a wiring line in a step of forming one of the plurality of electrodes; and forming an auxiliary electrode so that it is electrically connected in parallel to the wiring line in a step of forming another or other plural ones of the plurality of electrodes
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