Active matrix substrate and active matrix display apparatus

• US 5,151,807 A
• Filed: 01/30/1990
• Issued: 09/29/1992
• Est. Priority Date: 01/31/1989
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kato, Hiroaki, Katayama, Mikio, Kanemori, Yuzuru, Hirobe, Toshihiko, Nagayasu, Takayoshi, Negoto, Hidenori, Imaya, Akihiko
• Primary Examiner(s): Oberley, Alvin E.
• Assistant Examiner(s): Luu, Matthew
• Application Number:
  US07/472,604
• Time in Patent Office: 973 Days
• Field of Search: 357/4, 357/51, 357/23.1, 357/30 H, 357/30 I, 357/30 Q, 350/336, 350/332, 350/333, 350/334, 359/55, 359/57, 359/58, 359/59
• US Class Current: 349/55
• CPC Class Codes: G02F 1/1309 Repairing; Testing
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/136259 Repairing; Defects

Abstract

An active matrix substrate comprising picture element electrodes disposed in a matrix on a substrate, each of which is composed of divided electrodes, and an electrically conductive film on which two of said divided electrodes adjacent to each other are superposed in a manner to sandwich an insulating film therebetween so as to form a connection. The connection is irradiated with laser beams from the outside of the display apparatus when one of the divided electrodes brings about a picture element defect, so that both the divided electrodes can be electrically connected to each other, thereby attaining a correction of the picture element defect. A display apparatus using the active matrix substrate is also provided.

Claims

1. An active matrix display apparatus comprising a pair of substrates at least one of which is translucent, a display medium charged between said substrates, the optical characteristics of said display medium being modulated in response to an applied voltage, picture element electrodes disposed in a matrix on one of said pair of substrates, each of said picture element electrodes being composed of a pair of divided electrodes, a first bus wiring disposed between said pair of divided electrodes, and a second bus wiring intersecting with said first bus wiring, wherein a connection region comprises a pair of electrical conductor layers disposed at both sides of said first bus wiring and extending in parallel thereto, a pair of electrical conductor pieces superposed on portions of said electrical conductor layers so as to sandwich an insulating film therebetween in a non-conductive state, respectively, portions of said divided electrode superposed on said electrical conductor pieces in a conductive state respectively, and a spare wiring intersecting with said first bus wiring so as to sandwich said insulating film therebetween, said spare wiring being superposed on said electrical conductor layers so as to sandwich said insulating film therebetween in a non-conductive state, and said connection region being coated by a protective coat so as to be isolated from said display medium.

2. An active matrix display apparatus according to claim 1, wherein at said connection region, one end of each of said electrical conductor layer and each of said pair of branch ends of said second bus wiring are superposed to each other so as to sandwich said insulating film therebetween in a non-conductive state.

3. An active matrix display apparatus according to claim 1, wherein a connection comprises an electrically conductive film superposed on said divided electrodes constituting said picture element electrodes adjacent to each other, a pair of metal pieces superposed on both ends of said electrically conductive film so as to sandwich said insulating film therebetween in a non-conductive state, and portions of said divided electrodes superposed on said metal pieces in a conductive state, said connection being coated by a protective film so as to be isolated from said display medium.

4. An active matrix display apparatus according to claim 2, wherein a connection comprises an electrically conductive film superposed on said divided electrodes constituting said picture element electrodes adjacent to each other, a pair of metal pieces superposed on both ends of said electrically conductive film so as to sandwich said insulating film therebetween in a non-conductive state, and portions of said divided electrodes superposed on said metal pieces in a conductive state, said connection being coated by a protective film so as to be isolated from said display medium.

5. An active matrix display apparatus comprising a pair of substrates at least one of which is translucent, a display medium charged between said substrates, the optical characteristics of said display medium being modulated in response to an applied voltage, picture element electrodes disposed in a matrix on one of said pair of substrates, each of said picture element electrodes being composed of a pair of divided electrodes, a first bus wiring disposed between said pair of divided electrodes, and a second bus wiring intersecting with said first bus wiring, wherein a connection region comprises a pair of electrical conductor layers disposed at both sides of said first bus wiring and extending in parallel thereto, a pair of branch ends of said second bus wiring superposed on one ends of said electrical conductor layers so as to sandwich an insulating film therebetween in a non-conductive state respectively, and a spare wiring intersecting with said first bus wiring so as to sandwich sand insulating film therebetween, said spare wiring being superposed on said electrical conductor layers so as to sandwich said insulating film therebetween in a non-conductive state, and said connection region being coated by a protective coat so as to be isolated from said display medium.

6. An active matrix display apparatus according to claim 5, wherein a connection comprises an electrically conductive film superposed on said divided electrodes constituting said picture element electrodes adjacent to each other, a pair of metal pieces superposed on both ends of said electrically conductive film so as to sandwich said insulating film therebetween in a non-conductive state, and portions of said divided electrodes superposed on said metal pieces in a conductive state, said connection being coated by a protective film so as to be isolated from said display medium.