EP 1258857 A1 20021120 - 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
Application
Priority
EP 01112254 A 20010518
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
IPC 8 full level
CPC (source: EP)
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)
- [X] US 5821917 A 19981013 - CAPPELS RICHARD D [US]
- [A] WO 0017846 A1 20000330 - MATSUSHITA ELECTRIC IND CO LTD [JP], et al
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 01112254 A 20010518