Method of displaying video images on a plasma display panel and corresponding plasma display panel

• US 20040090397A1
• Filed: 09/12/2003
• Published: 05/13/2004
• Est. Priority Date: 03/13/2001
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Kervec, Jonathan, Hoelzemann, Herbert, Doyen, Didier
• Granted Patent: US 7,187,349 B2
• Time in Patent Office: Days
• US Class Current: 345/60
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/0266 Reduction of sub-frame artefacts
• CPC Class Codes: G09G 2320/106 Determination of movement vectors or equivalent parameters within the image
• CPC Class Codes: G09G 3/2033 with splitting one or more sub-frames corresponding to the most significant bits into two or more sub-frames
• CPC Class Codes: G09G 3/204 the sub-frames being organized in consecutive sub-frame groups
• CPC Class Codes: G09G 3/28 using luminous gas-discharge panels, e.g. plasma panels

Abstract

The present invention relates to a method of displaying video images on a plasma display panel. The invention is applicable in plasma display panels (PDPs). According to the invention, in order to achieve contouring movement compensation, the subscans are divided into two symmetrical groups of subscans. Moreover, the movement of the video image to be displayed with respect to the preceding video image is estimated so as to generate a movement vector for each pixel of the video image. Finally, for each pixel of the video image, the subscans of the second group are displaced by an amount proportional to the estimated movement vector.

Claims

1. Method of displaying video images on a display panel comprising a plurality of elementary cells, each video image being coded according to a plurality of subscans during which each elementary cell is either on or off, each subscan having a weight proportional to the duration of its illumination period, characterized in that, for each video image, the following steps are carried out:

the said plurality of subscans is divided into two consecutive groups of subscans, the two groups having the same number of subscans of corresponding weight, the temporal distribution of which is symmetrical;

the movement of the said video image to be displayed with respect to the preceding video image is estimated so as to generate a movement vector for each pixel of the video image; and

for each pixel of the video image, the subscans of the second group are displaced by an amount approximately equal to one half of the estimated movement vector.

2. Method according to claim 1, characterized in that the subscans of the first group are arranged in increasing order of their weights and the subscans of the second group are arranged in decreasing order of their weights.

3. Plasma display panel, characterized in that it includes a device implementing the display method according to either of claims 1 and 2.