Liquid crystal display device

• US 8,866,713 B2
• Filed: 06/09/2005
• Issued: 10/21/2014
• Est. Priority Date: 12/31/2004
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, Dong-Hoon, Ryu, Ho-Jin
• Primary Examiner(s): Chang, Kent
• Assistant Examiner(s): AU, SCOTT D
• Application Number:
  US11/148,373
• Publication Number:
  US 20060145983A1
• Time in Patent Office: 3,421 Days
• Field of Search: 345/30, 345/55, 345/84, 345/87, 345/88, 345/89, 345/90, 345/91, 345/92, 345/93, 345/94, 345/95, 345/96, 345/97, 345/98, 345/99, 345/100, 345/101, 345/102, 345/103, 345/104, 345/204, 345/205, 345/206, 345/208, 345/209, 345/210, 345/214, 345/690, 345/691, 349/33, 349/34, 349/36, 349/37, 349/38, 349/39, 349/41, 349/42, 349/46, 349/47, 349/48, 349/54
• US Class Current: 345/92
• 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 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• 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 (LCD) device capable of reducing the driving power and preventing cross talk is provided. The LCD device comprises: a plurality of data lines arranged on a substrate in a vertical direction for transmitting image data; a plurality of gate lines arranged on the substrate in a horizontal direction for transmitting a scan signal; a plurality of pixels formed at each intersection between the gate lines and the data lines and arranged on the substrate in a matrix formation; a first electrode and a second electrode respectively provided at each pixel for forming a horizontal electric field; and a plurality of first common voltage lines and second common voltage lines alternately arranged on the substrate in a horizontal direction, wherein the second electrodes provided at each pixel of a line unit are alternately connected to the first common voltage line and the second common voltage line.

Claims

1. A liquid crystal display (LCD) device comprising:

a plurality of data lines arranged in a column direction on a substrate;

a plurality of gate lines arranged in a row direction on the substrate;

a plurality of pixels formed at intersections between the gate lines and the data lines, which are perpendicular to each other and arranged on the substrate in a matrix configuration;

a plurality of first electrodes and a plurality of second electrodes at each pixel, respectively, for generating an electric field between the first electrodes and the second electrodes; and

a plurality of first common voltage lines alternately arranged with a plurality of second common voltage lines on the substrate in the row direction,

wherein each of the plurality of first common voltage lines are connected to second electrodes at a plurality of pixels of odd numbered rows and odd numbered columns and connected to second electrodes at a plurality of pixels of even numbered rows and even numbered columns adjacent to the odd numbered rows and odd numbered columns,

wherein each of the plurality of second common voltage lines are connected to second electrodes at a plurality of pixels of even numbered rows and even numbered columns and connected to second electrodes at a plurality of pixels of odd numbered rows and odd numbered columns, so that each of the second electrodes in two pixels adjacent in the row or the column direction are respectively connected to the first common voltage line and the second common voltage line, wherein a voltage polarity applied to the first common voltage lines is different than a voltage applied to the second common voltage lines.

2. The LCD device of claim 1, wherein the first electrodes are pixel electrodes and the second electrodes are common electrodes.

3. The LCD device of claim 1, wherein the first common voltage lines are electrically connected to each other and the second common voltage lines are electrically connected to each other.

4. The LCD device of claim 1, wherein the first common voltage lines and the second common voltage lines are formed on the substrate in a horizontal direction.

5. The LCD device of claim 1, wherein a first common voltage having a pulse shape transformed on a one frame basis is applied to the first common voltage lines, and a second common voltage having a pulse shape that is an inversion of the first common voltage is applied to the second common voltage lines.

6. The LCD device of claim 1, wherein the second electrodes of even numbered pixels in a line unit are connected to the first common voltage lines, and the second electrodes of odd numbered pixels in the line unit are connected to the second common voltage lines.