Liquid crystal display device and method of fabricating the same

• US 9,500,923 B2
• Filed: 11/12/2014
• Issued: 11/22/2016
• Est. Priority Date: 03/14/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, Hyuck
• Primary Examiner(s): Qi, Mike
• Application Number:
  US14/539,911
• Publication Number:
  US 20150070610A1
• Time in Patent Office: 741 Days
• Field of Search: 349/142, 349/144, 349/138, 349/139
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/134336 Matrix
• 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 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 33/0041 characterised by field-effect operation

Abstract

Discussed are a liquid crystal display device and a method of fabricating the same in which a single common line is formed at the center of a substrate, which results in an enhanced aperture ratio and transmittance. The liquid crystal display device includes a single common line located at a center of a substrate; a first group of unit pixels located in a right portion of the substrate on the basis of the common line and a second group of unit pixels located in a left portion of the substrate on the basis of the common line, each unit pixel defined by a plurality of gate lines and data lines orthogonally intersecting each other; and a plurality of thin film transistors formed at a right side of the respective unit pixels of the first group and at a left side of the respective unit pixels of the second group.

Claims

1. A liquid crystal display device comprising:

a single common line located at a center of a substrate;

a first group of unit pixels located in a right portion of the substrate on the basis of the common line and a second group of unit pixels located in a left portion of the substrate on the basis of the common line, each unit pixel defined by a plurality of gate lines and data lines orthogonally intersecting each other; and

a plurality of thin film transistors formed at a right side of the respective unit pixels of the first group and at a left side of the respective unit pixels of the second group,

wherein each unit pixel includes;

a thin film transistor formed on the lower substrate;

at least one of insulating film on the substrate including the thin film transistor;

a pixel electrode formed on the at least one of insulating film to connect to the thin film transistor on a per unit pixel basis;

a third insulating film formed over the pixel electrode; and

a common electrode on the third insulating film to contact to the single common line, wherein the common electrode is formed over the entire surface of the lower substrate to have an opening corresponding to the thin film transistor.

2. The device according to claim 1, wherein, each gate line is located at the right side of the respective unit pixels in the first group of unit pixels, and each gate line is located at the left side of the respective unit pixels in the second group of unit, wherein the gate lines are parallel to the single common line.

3. The device according to claim 1,

wherein the pixel electrode and the common electrode create a fringe field therebetween with the third insulating film.

4. The device according to claim 3, wherein the pixel electrodes or the common electrode is formed in a form of slits.