Display device

• US 20070146279A1
• Filed: 09/26/2006
• Published: 06/28/2007
• Est. Priority Date: 09/27/2005
• Status: Abandoned Application

• Current Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Oke, Ryutaro, Imajo, Yoshihiro
• Application Number:
  US11/526,610
• Publication Number:
  US 20070146279A1
• Time in Patent Office: Days
• US Class Current: 345/94
• CPC Class Codes: G09G 2310/0229 De-interlacing
• CPC Class Codes: G09G 2320/0204 Compensation of DC component across the pixels in flat panels
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

An afterimage produced when a hold response display is used in an I/P conversion display mode is reduced. This is achieved by a display device comprising: a plurality of drain electrode lines and a plurality of gate electrode lines arranged in a matrix; and pixel areas, each surrounded by two adjacent ones of the drain electrode lines and two adjacent ones of the gate electrode lines, each pixel area having a TFT element, the assembly of the pixel areas defining a display area, wherein a drain electrode of the TFT element is electrically connected to the drain electrode line, a source electrode of the TFT element is electrically connected to a pixel electrode, the pixel electrode repeatedly receives a signal of positive polarity even or odd number of times and a signal of negative polarity the same number of times as the signal of positive polarity, and one or both of the occurrence of the signal of negative polarity and the signal of positive polarity are periodically changed to an odd number when the occurrence of the signal of positive polarity is an even number, or to an even number when the occurrence of the signal of positive polarity is an odd number.

Claims

1. A display device comprising:

a plurality of drain electrode lines and a plurality of gate electrode lines arranged in a matrix; and

pixel areas, each surrounded by two adjacent ones of the drain electrode lines and two adjacent ones of the gate electrode lines, each pixel area having a TFT element, the assembly of the pixel areas defining a display area,

wherein a drain electrode of the TFT element is electrically connected to the drain electrode line, a source electrode of the TFT element is electrically connected to a pixel electrode, the pixel electrode repeatedly receives a signal of positive polarity even or odd number of times and a signal of negative polarity the same number of times as the signal of positive polarity, and one or both of the occurrence of the signal of negative polarity and the signal of positive polarity are periodically changed to an odd number when the occurrence of the signal of positive polarity is an even number, or to an even number when the occurrence of the signal of positive polarity is an odd number.

2. The display device according to claim 1, wherein each of the signal of positive polarity and the signal of negative polarity is repeatedly applied 2n times, and one or both of the occurrence of the signal of negative polarity and the signal of positive polarity are periodically changed to (2n+1) or (2n−

1).

3. A display device comprising:

a plurality of drain electrode lines and a plurality of gate electrode lines arranged in a matrix; and

pixel areas, each surrounded by two adjacent ones of the drain electrode lines and two adjacent ones of the gate electrode lines, each pixel area having a TFT element, the assembly of the pixel areas defining a display area,

wherein a drain electrode of the TFT element is electrically connected to the drain electrode line, a source electrode of the TFT element is electrically connected to a pixel electrode, the pixel electrode repeatedly receives a signal of positive polarity and a signal of negative polarity same number of times for each signal, the polarities of pixel electrodes of adjacent pixels in the direction the drain electrode line extends are different from each other, and

a signal of either polarity is periodically applied in succession to a plurality of adjacent pixels in the direction the drain electrode line extends.