Liquid crystal display device

• US 20060119755A1
• Filed: 11/29/2005
• Published: 06/08/2006
• Est. Priority Date: 11/30/2004
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Senda, Michiru, Kobayashi, Mitsugu, Tsutsui, Yusuke
• Application Number:
  US11/290,993
• Publication Number:
  US 20060119755A1
• Time in Patent Office: Days
• US Class Current: 349/38
• 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 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 3/3688 suitable for active matrices only

Abstract

An LCD device driven with storage capacitors prevents defective image display caused by capacitive coupling between data lines and storage capacitor lines. The LCD device includes pixel electrodes arranged at intersections between drain lines and gate lines, switching elements, storage capacitor lines corresponding to the gate lines, storage capacitors having first electrodes connected to the pixel electrodes and second electrodes connected to the storage capacitor lines, a switching circuit for selectively applying a potential to the storage capacitor lines, and a drain driver. The drain driver selects some of the data lines so that an equal number of image data signals having a positive polarity and image data signals having a negative polarity are provided to the selected data lines and simultaneously provides the selected data lines with the image data signals having a positive polarity and the image data signals having a negative polarity.

Claims

1. A liquid crystal display device comprising:

a plurality of data lines;

a plurality of gate lines intersecting the plurality of data lines;

a plurality of pixel electrodes respectively arranged at intersections between the plurality of data lines and the plurality of gate lines;

a plurality of switching elements, each including a control terminal connected to a corresponding one of the plurality of gate lines, a first terminal connected to a corresponding one of the plurality of pixel electrodes, and a second terminal connected to a corresponding one of the plurality of data lines;

a plurality of storage capacitor lines respectively corresponding to the plurality of gate lines;

a plurality of storage capacitors, each including a first capacitor electrode connected to a corresponding one of the plurality of pixel electrodes and a second capacitor electrode connected to a corresponding one of the plurality of storage capacitor lines;

a first drive unit, connected to the plurality of storage capacitor lines, for selectively applying a storage capacitor potential to the plurality of storage capacitor lines; and

a second drive unit, connected to the plurality of data lines, for alternately providing an image data signal having a positive polarity and an image data signal having a negative polarity to the plurality of data lines, wherein the second drive unit selects some of the data lines so that an equal number of image data signals having a positive polarity and image data signals having a negative polarity are provided to the selected data lines, the second drive unit simultaneously providing the selected data lines with the image data signals having a positive polarity and the image data signals having a negative polarity.

2. The liquid crystal display device according to claim 1, wherein the second drive unit selects some of the data lines in quantities that are an even number starting from a data line located at an end of the plurality of data lines.

3. The liquid crystal display device according to claim 1, wherein the second drive unit selects some of the data lines in quantities that are an even number at an interval of an even number of data lines.

4. The liquid crystal display device according to claim 1, further comprising:

a plurality of additional capacitors respectively connected to the plurality of storage capacitor lines.

5. The liquid crystal display device according to claim 1, wherein the plurality of storage capacitor lines include first and second storage capacitor lines for each of the plurality of gate lines, and the plurality of storage capacitors include a first storage capacitor connected to each first storage capacitor line and a second storage capacitor connected to each second storage capacitor line.

6. The liquid crystal display device according to claim 5, wherein a plurality of sets of the first and second storage capacitors are connected so that the first and second storage capacitors are arranged alternately on the first and second storage capacitor lines.

7. The liquid crystal display device according to claim 5, wherein the first storage capacitor lines correspond to the data lines provided with the image data signals having a positive polarity, the second storage capacitor lines correspond to the data lines provided with the image data signals having a negative polarity, and the first drive unit applies a storage capacitor potential having a first level to the first storage capacitor lines and applies a storage capacitor potential having a second level differing from the first level to the second storage capacitor lines.