Liquid crystal display panel

• US 9,052,554 B2
• Filed: 08/27/2010
• Issued: 06/09/2015
• Est. Priority Date: 09/02/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Ota, Akio, Watanabe, Sachiko
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): BIBBEE, CHAYCE R
• Application Number:
  US12/870,005
• Publication Number:
  US 20110050551A1
• Time in Patent Office: 1,747 Days
• Field of Search: 345/87
• US Class Current: 1/1
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A liquid crystal display panel includes: substrates arranged opposite to each other with a liquid crystal layer therebetween. One of the substrates includes scanning and signal lines arranged in a matrix in a display area, a common wiring line along a peripheral edge portion of the display area, an interlayer resin film at least over the whole display area, and lower and upper electrodes arranged opposite to each other with an inter-electrode insulating film therebetween. The upper electrode includes slits in each pixel area sectioned by the scanning and signal lines. One of the upper and lower electrodes is formed over the whole display area and connected to the common wiring line and operates as a common electrode. In the display area, a common line is formed in parallel to the scanning line, the electrode operating as the common electrode is connected to the common line through a contact hole and the common line is connected to the common wiring line at the peripheral edge portion.

Claims

1. A liquid crystal display panel comprising:

a pair of substrates arranged opposite to each other with a liquid crystal layer sandwiched therebetween,

one of the pair of substrates including

plural scanning lines and signal lines arranged in a matrix state in a display area,

a common wiring line formed along a peripheral edge portion of the display area,

an interlayer resin film formed at least over the whole display area, and

a lower electrode and an upper electrode made of a transparent conductive material arranged opposite to each other with an inter-electrode insulating film sandwiched therebetween,

wherein the upper electrode includes plural slits formed in each pixel area sectioned in a row direction and a column direction by the scanning line and the signal line in the display area in planar view,

wherein one of the upper electrode and the lower electrode is electrically connected to the common wiring line and operates as a common electrode,

wherein in the display area, a common line is formed along the scanning line, the common line is made of a light shielding metal material, and the electrode operating as the common electrode is electrically connected to the common line through a contact hole in each pixel area, and the common line is electrically connected to the common wiring line at the peripheral edge portion of the display area,

wherein the common line has a connection portion that is electrically connected to the electrode operating as the common electrode,

wherein a width of the connection portion in the row direction is wider than a maximum width of the contact hole in the row direction, and a width of the connection portion in the column direction is wider than a maximum width of the contact hole in the column direction, and

wherein the connection portion is formed at a position in which the connection portion overlaps with the contact hole in planar view so as to shield an opening of the contact hole.

2. The liquid crystal display panel according to claim 1, further comprising:

at least one relay terminal formed between the common line and the common electrode at a position where the relay terminal overlaps with the contact hole,

wherein the electrode operating as the common electrode is electrically connected to the relay terminal to be electrically connected to the common line through the relay terminal.

3. The liquid crystal display panel according to claim 2,

wherein the relay terminal is formed in the same layer as the signal line.

4. The liquid crystal display panel according to claim 2,

wherein a connection portion between the electrode operating as the common electrode and the relay terminal does not overlap with a connection portion between the relay terminal and the common line in planar view.

5. The liquid crystal display panel according to claim 2,

wherein the relay terminal is made of a non-transparent material and formed so as to shield the opening of the contact hole in planar view.

6. The liquid crystal display panel according to claim 1,

wherein a first slit opening area and a second slit opening area in which rotation directions of liquid crystal molecules are reverse to each other are formed on the upper electrode, and

the common line is formed at a boundary between the first and the second slit opening areas.