Patent ID: 6573662
Filing Date: 2003-06-03
Classification: G02F,H01J

Abstract:
A plasma addressed display device comprising:a channel substrate provided with an array of interconnected longitudinal channel chambers; a cover sheet extending over the channel chambers and making seals to the channel chambers on a side of an upper face of the chamber, whereby the channel substrate and the cover sheet define sealed channel chambers; a pair of electrodes located in each sealed channel chamber for selectively ionizing a gas within the channel chamber; a dopant source having a storage material that reversibly absorbs and releases a dopant gas to be mixed with a primary ionizable gas in the sealed channel chambers; and a heater for heating the storage material, which is CHARACTERIZED in that there is provided a feedback loop for a control of partial pressure of the dopant gas within the sealed channel chambers, the feedback loop comprising: measurement means for measuring a value corresponding to a decay time of an electrical conductivity in at least one of the channel chambers from turning off the plasma in the channel chamber; and control means for controlling a temperature of the storage material through the heater on the basis of the measured value so that the decay time is within a predetermined range.