Liquid crystal display device having improved electrostatic discharge resistance

• US 8,830,409 B2
• Filed: 12/26/2007
• Issued: 09/09/2014
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Segawa, Yasuo, Aota, Masaaki, Onogi, Tomohide, Matsuda, Hiroshi
• Primary Examiner(s): Nguyen, Hoan C
• Application Number:
  US12/003,455
• Publication Number:
  US 20080158453A1
• Time in Patent Office: 2,449 Days
• Field of Search: 349/141, 349/34, 349/40
• US Class Current: 349/40
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/136204 Arrangements to prevent high voltage or static electricity failures
• CPC Class Codes: G02F 2202/22 Antistatic materials or arrangements

Abstract

A liquid crystal display device includes a first substrate, a second substrate and liquid crystal. The first substrate includes pixel electrodes, a peripheral circuit and a dummy wiring. The peripheral circuit and the dummy wiring are provided outside a pixel area in which the pixel electrodes are arranged. The second substrate is opposed to the first substrate through the liquid crystal. The second substrate includes a translucent conductive film that is provided on an opposite side of the second substrate to a side where the liquid crystal is present. The dummy wiring is located on an outer peripheral side of the substrates than the peripheral circuit and is provided independently of the peripheral circuit in terms of circuit. The dummy wiring is grounded outside the first substrate.

Claims

1. A liquid crystal display device comprising:

a first substrate having a side and including pixel electrodes, a peripheral circuit, at least one common electrode, and a dummy wiring, the peripheral circuit and the dummy wiring being provided outside a pixel area in which the pixel electrodes are arranged, the peripheral circuit being arranged along the side of the first substrate;

a second substrate that includes a translucent conductive film provided at an opposite side of the second substrate to a side where the liquid crystal is present; and

liquid crystal through which the second substrate is opposed to the first substrate, wherein

the peripheral circuit includes a common wiring supplying a common electric potential to the at least one common electrode, the common wiring being separate from the dummy wiring,

the dummy wiring is located close to an outermost edge of the first substrate,

the dummy wiring is made of a continuous metal layer surrounding the pixel area and peripheral circuit to ground the static electricity,

the dummy wiring is located between the peripheral circuit and the outermost edge of the side at which the peripheral circuit is positioned and is not electrically connected to the peripheral circuit, the dummy wiring is connected to a ground potential outside the first substrate and the dummy wiring surrounds the peripheral circuit on at least three sides of the first substrate, and

wherein the dummy wiring is provided to discharge electric potential rise on the first substrate that occurs due to coupling with electric potential rise of the translucent conductive film on the second substrate.

2. The liquid crystal display device according to claim 1, wherein the translucent conductive film is maintained at a predetermined electric potential.

3. The liquid crystal display device according to claim 2, wherein the dummy wiring is positioned at an outermost periphery of the substrate outer edge side of the first substrate.

4. The liquid crystal display device according to claim 3, wherein the dummy wiring does not intersect with the periphery circuit.

5. The liquid crystal display device according to claim 4, the dummy wiring surrounds the outer periphery of the side of the first substrate and does not constitute a closed path, both ends of the dummy wiring are extended to a portion that connects with the external wiring and are connected to the ground potential of the external circuit through the external wiring.

6. The liquid crystal display device according to claim 1, wherein the ground potential outside the first substrate is separate from a ground potential of the liquid crystal display device.

7. The liquid crystal display device according to claim 1, wherein the dummy wiring has two ends, wherein each end is connected to the ground potential outside the first substrate.

8. The liquid crystal display device according to claim 1, wherein the dummy wiring surrounds all of the at least three sides of the first substrate and surrounds at least part of a fourth side.

9. A liquid crystal display device comprising:

a first substrate including pixel electrodes, a peripheral circuit, at least one common electrode, and a dummy wiring, the first substrate having a side with an edge and a pixel area, the peripheral circuit and the dummy wiring being provided outside of the pixel area, the pixel electrodes being arranged at the pixel area, the peripheral circuit being arranged along the side of a first substrate;

a second substrate having a first side and a second side opposite to a first side, the second substrate including liquid crystal provided at the first side of the second substrate and a translucent conductive film provided at a second side of the second substrate, the liquid crystal being disposed between the second substrate and the first substrate, the dummy wiring being positioned between the peripheral circuit and the edge of the side of the first substrate and is not electrically connected to the peripheral circuit, the dummy wiring being connected to a ground potential outside the first substrate;

wherein;

the peripheral circuit includes a common wiring supplying a common electric potential to the at least one common electrode, the common wiring being separate from the dummy wiring,

the dummy wiring is located close to an outermost edge of the first substrate,

the dummy wiring is made of a continuous metal layer surrounding the pixel area and peripheral circuit to ground the static electricity, and the dummy wiring surrounds the peripheral circuit on at least three sides of the first substrate in a plain view, and

wherein the dummy wiring is provided to discharge electric potential rise on the first substrate that occurs due to coupling with electric potential rise of the translucent conductive film on the second substrate.