LIQUID CRYSTAL DISPLAY

• US 20110032241A1
• Filed: 08/03/2010
• Published: 02/10/2011
• Est. Priority Date: 08/10/2009
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Moon, Hongman, JEONG, Youngmin
• Granted Patent: US 8,416,231 B2
• Time in Patent Office: Days
• US Class Current: 345/212
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2370/08 Details of image data interface between the display device controller and the data line driver circuit
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players

Abstract

A liquid crystal display includes a liquid crystal display panel on which a plurality of first units each including at least one liquid crystal cell and a plurality of second units each including at least one liquid crystal cell are positioned in a display area and data line and gate lines cross one another, a common voltage generation unit generating first and second common voltages, a plurality of first longitudinal common lines that supply the first common voltage input through a plurality of first input units to each of first common electrodes of the first units, and a plurality of second longitudinal common lines that supply the second common voltage input through a plurality of second input units to each of second common electrodes of the second units.

Claims

1. A liquid crystal display comprising:

a liquid crystal display panel on which a plurality of first units each including at least one liquid crystal cell and a plurality of second units each including at least one liquid crystal cell are positioned in a display area and a plurality of data line and a plurality of gate lines cross one another;

a common voltage generation unit configured to generate a first common voltage and a second common voltage;

a plurality of first longitudinal common lines configured to supply the first common voltage input through a plurality of first input units to each of first common electrodes of the plurality of first units; and

a plurality of second longitudinal common lines configured to supply the second common voltage input through a plurality of second input units to each of second common electrodes of the plurality of second units,

wherein each of the plurality of first longitudinal common lines is connected to at least one of the first common electrodes through a first thin film transistor (TFT),

wherein each of the plurality of second longitudinal common lines is connected to at least one of the second common electrodes through a second TFT.

2. The liquid crystal display of claim 1, wherein the first common voltage and the second common voltage are swung in opposite directions every predetermined period of time.

3. The liquid crystal display of claim 2, wherein the predetermined period of time is k horizontal period, where k is a natural number.

4. The liquid crystal display of claim 1, wherein the first common electrodes that are not directly connected to the first TFT are electrically connected to the at least one first common electrode directly connected to the first TFT,

wherein the second common electrodes that are not directly connected to the second TFT are electrically connected to the at least one second common electrode directly connected to the second TFT.

5. The liquid crystal display of claim 1, wherein the first and second longitudinal common lines are formed in a direction parallel to the data lines.

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

a first edge common line configured to be formed in a non-display area outside the display area of the liquid crystal display panel and configured to electrically connect the first input units to the first longitudinal common lines; and

a second edge common line configured to be formed independently of the first edge common line in the non-display area and configured to electrically connect the second input units to the second longitudinal common lines.

7. The liquid crystal display of claim 1, further comprising a plurality of source tape carrier packages (TCPs) on which data driver integrated circuits (ICs) for driving the data lines are respectively mounted,

wherein the first input units include a dummy channel at one side of each of the plurality of source TCPs,

wherein the second input units include a dummy channel at the other side of each of the plurality of source TCPs.

8. The liquid crystal display of claim 6, wherein the first and second edge common lines are formed using the same metal pattern as the gate lines,

wherein the first and second longitudinal common lines are formed using the same metal pattern as the data lines.

9. The liquid crystal display of claim 6, wherein the first and second edge common lines each have a line width greater than the gate lines,

wherein the first and second longitudinal common lines each have a line width less than the data lines,

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

a storage line configured to cross the first and second longitudinal common lines at a right angle in the liquid crystal cells of the first and second units and configured to receive a voltage of a constant level; and

a shield pattern configured to extend from the storage line along the data lines or the first and second longitudinal common lines in an outside area of the liquid crystal cells of the first and second units.

11. The liquid crystal display of claim 1, wherein when a resolution of a liquid crystal cell array including the liquid crystal cells of the first and second units is m×

n, where m and n are a natural number, 3m/2 data lines and 2n gate lines are formed on the liquid crystal display panel,

wherein a gate pulse having a width corresponding to ½

horizontal period synchronized with a data voltage is sequentially supplied to the gate lines.

12. The liquid crystal display of claim 1, wherein when a resolution of a liquid crystal cell array including the liquid crystal cells of the first and second units is m×

n, where m and n are a natural number, m data lines and 3n gate lines are formed on the liquid crystal display panel,

wherein a gate pulse having a width corresponding to ⅓

horizontal period synchronized with a data voltage is sequentially supplied to the gate lines.