Global Patent Index - EP 1258857 A1

EP 1258857 A1 2002-11-20 - Method for compensation of ageing effects in a plasma panel

Title (en)

Method for compensation of ageing effects in a plasma panel

Title (de)

Verfahren zur Kompensierung von Alterungseffekten einer Plasma-Anzeigetafel

Title (fr)

Procédé de compensation des effets du vieillissement dans un écran à plasma

Publication

EP 1258857 A1 (EN)

Application

EP 01112254 A

Priority

EP 01112254 A

Abstract (en)

In a plasma display panel (PDP) a method for prolonging useful life thereof comprises the steps of performing an experiment on red, green, and blue phosphor layers each coated on a corresponding discharge cell for calculating a gain per gray scale on the phosphor layer of each discharge cell and obtaining expressions to represent relationship with respect to the use time of each discharge cell, thereby establishing a comparison table with respect to the gains; enabling a control circuit of PDP to select one of the gains from the comparison table based on use time for dynamically adjusting strength of input video signal of each discharge cell; and compensating a reduced brightness per gray scale on the phosphor layer of each discharge cell due to increase of the use time by each of emitted red, green and blue lights. This compensates the reduced emissivity and eliminates adverse effects such as shortening of life, color temperature change, and color deviation caused by the reduced emissivity. As a result, an image having an optimum color purity and color temperature is rendered and accordingly the useful life of PDP is improved. <IMAGE>

IPC 1-7 (main, further and additional classification)

G09G 3/28; G09G 5/02

IPC 8 full level (invention and additional information)

G09G 5/02 (2006.01); G09G 3/28 (2013.01)

CPC (invention and additional information)

G09G 3/2003 (2013.01); G09G 3/288 (2013.01); G09G 2320/0242 (2013.01); G09G 2320/043 (2013.01); G09G 2320/048 (2013.01); G09G 2320/0626 (2013.01); G09G 2320/0666 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

EP 1258857 A1 20021120

INPADOC legal status


2012-06-06 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20111220

2007-12-19 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20071115

2003-08-06 [AKX] PAYMENT OF DESIGNATION FEES

- Designated State(s): DE FR GB IT NL

2003-05-07 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20030307

2002-11-20 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-11-20 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI