Liquid crystal display device

• US 8,314,762 B2
• Filed: 10/16/2008
• Issued: 11/20/2012
• Est. Priority Date: 11/23/2007
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Park, June Ho
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Bolotin, Dmitriy
• Application Number:
  US12/252,735
• Publication Number:
  US 20090135125A1
• Time in Patent Office: 1,496 Days
• Field of Search: 345 87-104
• US Class Current: 345/92
• CPC Class Codes: G02F 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/043 Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
• CPC Class Codes: G09G 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A LCD device adapted to reduce data lines and prevent the deterioration of picture quality characteristics. The LCD device includes: a substrate defined into a plurality of pixels; a plurality of data lines arranged in a first direction on the substrate to divide the pixels in twos; a plurality of gate lines arranged on the substrate in a second direction crossing the first direction; thin film transistors each disposed on the pixels to be electrically connected to the respective gate lines and data lines; pixel electrodes each disposed on the pixels, to be electrically connected to the respective thin film transistors; and compensation electrodes each overlapped with the pixel electrodes adjacent to the respective gate lines in the center of an insulation film, to reduce parasitic capacitances between the pixel electrodes and the gate lines.

Claims

1. A liquid crystal display device comprising:

a substrate defined into a plurality of pixels;

a plurality of data lines arranged in a first direction on the substrate to divide the pixels two by two;

a plurality of gate lines arranged on the substrate in a second direction crossing the first direction;

thin film transistors disposed on the pixels, to be electrically connected to the respective gate lines and data lines;

pixel electrodes disposed on the pixels, to be electrically connected to the respective thin film transistors;

compensation electrodes overlapped with the pixel electrodes adjacent to the respective gate lines in the center of an insulation film, to reduce parasitic capacitances between the pixel electrodes and the gate lines; and

common lines, parallel with the data lines between the pixels which are divided in two by the data lines, each including storage electrode portions which are overlapped with the respective pixel electrodes in the center of the insulation film and form storage capacitors,

wherein the common line is crossed with the plurality of gate lines,

wherein the compensation electrode is disposed parallel to the gate line,

wherein the storage electrode portion is disposed parallel to the data line, and

wherein each of the thin film transistors of the gate lines which are disposed in both sides of pixel electrodes on the same row and each of the thin film transistors is alternately connected to the pixel electrodes,

wherein the common line is disposed between two pixels divided by the data lines and each of storage electrodes protruded from the common line is disposed at a left pixel and a right pixel of two pixels, and

wherein the storage electrodes are parallel with the common line.

2. The liquid crystal display device claimed as claim 1, wherein the compensation electrode is disposed in the same layer as one of the gate line and the data line.

3. The liquid crystal display device claimed as claim 1, wherein the compensation electrodes are formed in one unitary body with the common lines.

4. A liquid crystal display device comprising:

a substrate defined into a plurality of pixels;

a plurality of data lines arranged in a first direction on the substrate to divide the pixels two by two;

a plurality of gate lines arranged on the substrate in a second direction crossing the first direction;

thin film transistors disposed on the pixels, to be electrically connected to the respective gate lines and data lines;

pixel electrodes disposed on the pixels, to be electrically connected to the respective thin film transistors;

compensation electrodes overlapped with the pixel electrodes adjacent to the respective gate lines in the center of an insulation film, to reduce parasitic capacitances between the pixel electrodes and the gate lines;

common lines, parallel with the gate lines, each including storage electrode portions which are overlapped with the respective pixel electrodes in the center of the insulation film and form storage capacitors; and

connection patterns connecting the common lines which are disposed at each of the two pixels opposite each other in the center of the respective gate lines,

wherein the compensation electrodes and the common lines are formed in one unitary body,

wherein the compensation electrode is disposed parallel to the gate line,

wherein the storage electrode portion is disposed parallel to the data line,

wherein each of the thin film transistors of the gate lines which are disposed in both sides of pixel electrodes on the same row and each of the thin film transistors is alternately connected to the pixel electrodes, and

wherein the connection patterns are crossed with two gate lines and the storage electrode portion and the compensation electrode in the two pixels opposite each other are connected by the connection pattern.

5. The liquid crystal display device claimed as claim 4, wherein the common lines are formed in the shape of meshes.

6. The liquid crystal display device claimed as claim 4, wherein the connection patterns are arranged in the same layer as the pixel electrodes.