Biasing liquid crystal displays having capacitors and transistors
Pixel transistor free of parasitic capacitance fluctuations from misalignment
Liquid crystal display device Patent #: 4983022
ApplicationNo. 592272 filed on 10/03/1990
US Classes:349/55, Laser links257/59, In array having structure for use as imager or display, or with transparent electrode349/38, With supplemental capacitor349/42Transistor
ExaminersPrimary: Miller, Stanley D.
Assistant: Duong, Tai V.
Attorney, Agent or Firm
Foreign Patent References
International ClassG02F 001/133
Foreign Application Priority Data1989-10-04 JP
AbstractOne end portion of each pixel electrode is extended under a gate insulating film underlying the neighboring gate bus and defines an additional capacitance region. The extended portion of the pixel electrode is divided into a plurality of comb-tooth-like electrodes, each defining divided additional capacitors. One of the comb-tooth-like electrodes is separated by a gap from the pixel electrode, and first and second electrodes for laser welding use are formed on the comb-tooth-like electrode and the pixel electrode facing each other across the gap. The first and second electrodes form series-connected first and second capacitances for laser welding use between them and a third electrode for laser welding use formed above them with a gate insulating film interposed therebetween. When one of the divided additional capacitors connected to the pixel electrode is bad in insulation, the defective one of the divided additional capacitors is cut off and the first and second capacitances are caused to short by welding, whereby the total additional capacitance can be held substantially constant.
Field of SearchWelding