LIQUID CRYSTAL DISPLAY AND DRIVING METHOD THEREOF

• US 20090058785A1
• Filed: 06/12/2008
• Published: 03/05/2009
• Est. Priority Date: 08/29/2007
• Status: Abandoned Application

• Current Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Jung-Hwan, Yoshimura, Hideo, Jeon, Mu-Kyung, Jung, Tae-Hyeog
• Application Number:
  US12/138,259
• Publication Number:
  US 20090058785A1
• Time in Patent Office: Days
• US Class Current: 345/96
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/0254 Control of polarity reversal in general, other than for liquid crystal displays
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

A liquid crystal display including: a first common electrode line and a second common electrode line located near an edge of a panel and at least partly surrounding a plurality of pixels on the panel; a first common line positioned at an i^th horizontal row of the pixels and coupled to the first common electrode line; and a second common line positioned at an i+1^th horizontal row of the pixels and coupled to the second common electrode line; wherein each of the pixels includes a common electrode coupled to the first common line or the second common line.

Claims

1. A liquid crystal display comprising:

a first common electrode line and a second common electrode line located near an edge of a panel and at least partly surrounding a plurality of pixels on the panel;

a first common line positioned at an i^th horizontal row of the pixels and coupled to the first common electrode line; and

a second common line positioned at an i+1^th horizontal row of the pixels and coupled to the second common electrode line;

wherein

each of the pixels comprises a common electrode coupled to the first common line or the second common line.

2. The liquid crystal display as claimed in claim 1, further comprising a driving circuit for supplying a first common voltage to the first common electrode line and a second common voltage having an opposite polarity to the first common voltage to the second common electrode line.

3. The liquid crystal display as claimed in claim 2, wherein the driving circuit supplies the first and second common voltages, and wherein the common voltages are inversed in polarity between two sequentially adjacent frames.

4. The liquid crystal display as claimed in claim 1, further comprising:

a plurality of gate lines respectively at the i^th horizontal row of the pixels and the i+1^th horizontal row of the pixels and coupled to the pixels, and

a plurality of data line extending in a direction crossing the gate lines and coupled to the pixels.

5. The liquid crystal display as claimed in claim 4, wherein each of the pixels comprises a thin film transistor comprising a gate electrode coupled to a corresponding one of the gate lines, a source electrode coupled to a corresponding one of the date lines, and a drain electrode coupled to a pixel electrode that is parallel to the common electrode.

6. The liquid crystal display as claimed in claim 5, wherein the first common electrode line and the second common electrode line comprise a source/drain metal.

7. The liquid crystal display as claimed in claim 6, wherein the common electrode comprises a pixel electrode metal located in a different layer from the source/drain metal.

8. The liquid crystal display as claimed in claim 1, wherein both ends of the first common line are coupled to respective sides of the first common electrode line utilizing first contact holes, and both ends of the second common line are coupled to respective sides of the second common electrode line utilizing second contact holes.

9. A driving method for a liquid crystal display comprising:

applying a first common voltage of positive polarity to a first common electrode line located near an edge of a panel and at least partly surrounding a plurality of pixels on the panel driving a j^th frame period and transferring the first common voltage to a first common line positioned at an i^th horizontal row of pixels; and

applying a second common voltage of negative polarity to a second common electrode line located near the edge of the panel and at least partly surrounding the plurality of pixels on the panel driving the j^th frame period and transferring the second common voltage to a second common electrode line positioned at an i+1^th horizontal row of pixels,

wherein the polarities of the first and second common voltages supplied to the first common electrode line and the second common electrode line are inversed in two sequentially adjacent frames.

10. A liquid crystal panel comprising:

a first common electrode line and a second common electrode line located near a periphery of a liquid crystal panel and at least partly surrounding a plurality of pixels on the liquid crystal panel;

a first common line positioned at an i^th horizontal row of pixels and coupled to the first common electrode line;

a second common line positioned at an i+1^th horizontal row of pixels and coupled to the second common electrode line, wherein each of the pixels comprises a common electrode coupled to the first common line or the second common line;

a driving circuit for supplying a first common voltage to the first common electrode line and a second common voltage having an opposite polarity to the first common voltage to the second common electrode line, wherein the common voltages are inversed in polarity between two sequentially adjacent frames;

a plurality of gate lines respectively at the i^th horizontal row of pixels and the i+1^th horizontal row of pixels and coupled to the pixels; and

a plurality of data line extending in a direction crossing the gate lines and coupled to the pixels.

11. The liquid crystal panel as claimed in claim 10, wherein each of the pixels comprises a thin film transistor comprising a gate electrode coupled to a corresponding one of the gate lines, a source electrode coupled to a corresponding one of the date lines, and a drain electrode coupled to a pixel electrode that is parallel to the common electrode.

12. The liquid crystal panel as claimed in claim 10, wherein ends of the first common line are coupled to respective portions of the first common electrode line utilizing first contact holes, and ends of the second common line are coupled to respective portions of the second common electrode line at both ends of the second common line utilizing second contact holes.