Active matrix liquid crystal display device

• US 5,414,278 A
• Filed: 04/25/1994
• Issued: 05/09/1995
• Est. Priority Date: 07/04/1991
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kobayashi, Kazuhiro, Murai, Hiroyuki, Hayama, Masahiro
• Primary Examiner(s): Limanek, Robert P.
• Assistant Examiner(s): WILLIAMS, ALEXANDER O
• Application Number:
  US08/231,774
• Time in Patent Office: 379 Days
• Field of Search: 257/310, 257/59, 257/311, 257/72, 257/64, 257/71, 257/437, 257/382, 359/59
• US Class Current: 349/39
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode

Abstract

A pixel electrode and a line for a storage capacitor are sandwiched by first and second protecting films so as to position them in a different plane from a gate electrode and source/drain lines. An insulating film for a storage capacitor and the second protecting film remain at a crossing of the source line and a gate line, but part of them on a TFT is removed, when a pattern of the removal is at least partially deviated from a pattern of a contact hole in the first protecting film directly covering a polycrystalline Si film over the TFT, so that a short-circuit between lines and a breaking of the lines because of a level difference of film layers. Thus, an occurance of failure because of the short-circuit between lines is inhibited, and failure in the lines is reduced by reducing the breaking of the source line and/or the drain line.

Claims