Liquid crystal display

• US 20100110057A1
• Filed: 09/16/2009
• Published: 05/06/2010
• Est. Priority Date: 10/30/2008
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Oh, Jaeyoung, Choi, Sanghun, Shin, Dongsu, Lee, Jaekyun
• Granted Patent: US 8,368,630 B2
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• 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 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

A liquid crystal display is described. The liquid crystal display includes a common voltage generation unit that swings first and second common voltages in opposite directions every a predetermined period of time using two voltage levels, a plurality of first longitudinal common lines that are formed parallel to data lines to supply the first common voltage input through first input units to first pixel common line patterns formed in first pixel units, and a plurality of second longitudinal common lines that are formed parallel to the data lines to supply the second common voltage input through second input units to second pixel common line patterns formed in second pixel units.

Claims

1. A liquid crystal display comprising:

a liquid crystal display panel including a display area where a plurality of first pixel units each include at least one liquid crystal cell and a plurality of second pixel units each include at least one liquid crystal cell are positioned, and a plurality of data lines, and a plurality of gate lines are formed to cross each other;

a common voltage generation unit that swings a first common voltage and a second common voltage between two predetermined periods of time;

a plurality of first longitudinal common lines that are formed parallel to the data lines to supply the first common voltage input through a plurality of first input units to a plurality of first pixel common line patterns formed in the plurality of first pixel units, each of the first pixel common line patterns having a mesh structure; and

a plurality of second longitudinal common lines that are formed parallel to the data lines to supply the second common voltage input through a plurality of second input units to a plurality of second pixel common line patterns formed in the plurality of second pixel units, each of the second pixel common line patterns having a mesh structure.

2. The liquid crystal display of claim 1, further comprising:

a first edge common line that is formed in a non-display area outside the display area to electrically connect the first input units to the first longitudinal common lines; and

a second edge common line that is formed in the non-display area separately from the first edge common line to electrically connect the second input units to the second longitudinal common lines.

3. The liquid crystal display of claim 2, further comprising a plurality of data drive integrated circuits (ICs) for driving the data lines, wherein the first input units include a plurality of first common voltage input pads, each of which is connected to one dummy channel of both dummy channels of each of the data drive ICs, wherein the second input units include a plurality of second common voltage input pads, each of which is connected to the other dummy channel of each of the data drive ICs.

4. The liquid crystal display of claim 2, wherein the first and second edge common lines and the first and second pixel common line patterns have the same metal pattern as the gate lines, wherein the first and second longitudinal common lines have the same metal pattern as the data lines.

5. The liquid crystal display of claim 2, wherein the first pixel units and the second pixel units are positioned in a mosaic pattern or in a stripe pattern.

6. The liquid crystal display of claim 5, wherein when the first pixel units and the second pixel units are positioned in the mosaic pattern, the first pixel common line patterns of the first pixel units on adjacent horizontal lines are connected to the first longitudinal common line between the first pixel common line patterns in zigzags to supply the first common voltage to first common electrodes of the first pixel units, and the second pixel common line patterns of the second pixel units on adjacent horizontal lines are connected to the second longitudinal common line between the second pixel common line patterns in zigzags to supply the second common voltage to second common electrodes of the second pixel units.

7. The liquid crystal display of claim 6, wherein each of the first pixel unit and the second pixel unit includes two horizontally adjacent liquid crystal cells, wherein two gate lines and one data line are assigned to each of the first and second pixel units, wherein the first longitudinal common line and the second longitudinal common line are alternately positioned between horizontally adjacent pixel units.

8. The liquid crystal display of claim 6, wherein each of the first pixel unit and the second pixel unit includes three horizontally adjacent liquid crystal cells, wherein two gate lines and two data lines are assigned to each of the first and second pixel units, wherein the first longitudinal common line and the second longitudinal common line are alternately positioned between horizontally adjacent el pixel units

9. The liquid crystal display of claim 6, wherein each of the first pixel unit and the second pixel unit includes one liquid crystal cell, wherein one gate line and one data line crossing the middle of the pixel unit are assigned to each of the first and second pixel units, wherein the first longitudinal common line and the second longitudinal common line are alternately positioned between horizontally adjacent pixel units.

10. The liquid crystal display of claim 7, further comprising:

a normal edge common line that is separated from the first and second edge common lines in the non-display area to receive a normal common voltage;

a plurality of normal longitudinal common lines, each of which is formed between the first and second longitudinal common lines in a direction parallel to the data lines; and

a normal common line pattern that partially overlaps pixel electrodes of the liquid crystal cells and is commonly connected to the normal longitudinal common lines.

11. The liquid crystal display of claim 5, wherein when the first pixel units and the second pixel units are positioned in the stripe pattern, the first pixel common line patterns of the first pixel units on the same vertical line are commonly connected to the first longitudinal common line crossing the first pixel common line patterns to supply the first common voltage to first common electrodes of the first pixel units, and the second pixel common line patterns of the second pixel units on the same vertical line are commonly connected to the second longitudinal common line crossing the second pixel common line patterns to supply the second common voltage to second common electrodes of the second pixel units.

12. The liquid crystal display of claim 11, wherein each of the first pixel unit and the second pixel unit includes one liquid crystal cell, wherein one gate line and one data line are assigned to each of the first and second pixel units, wherein the first and second longitudinal common lines crossing the middle of vertically adjacent liquid crystal cells are alternately positioned.

13. The liquid crystal display of claim 1, wherein one of the two voltage levels is greater than the other, wherein the one voltage level has a potential equal to or greater than a maximum data voltage, and the other voltage level has a potential equal to or less than a minimum data voltage.

14. The liquid crystal display of claim 10, wherein the normal common voltage has a voltage level equal to or less than a low voltage level of the first and second common voltages.

15. The crystal display of claim 2, wherein a width of each of the first and second edge common line is greater than a width of each of the first and second longitudinal common lines.