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Cortinarius snowbankensis

Cortinarius snowbankensis is a species of fungus in the large agaric genus Cortinarius. Found in the United Kingdom, where it grows on decomposing snow, it was first described by mycologist Miles Joseph Berkeley in 1851. The fungus is edible.

See also
List of Cortinarius species


External links

Category:Fungi described in 1851
Category:Fungi of Europe
Category:Fungi of North America1. Field of the Invention
The present invention relates to an alternating current drive method and apparatus for a plasma display panel (PDP) which uses a one or more alternating current (AC) components in a single driving pulse in order to stably discharge the panel for an extended period of time.
2. Description of the Prior Art
As is well known in the art, a PDP is a type of flat panel display (FPD) that uses plasma discharge to produce a variety of colors. Two general discharge methods are used to make the panel discharge: hot electron method and cold cathode method. The hot electron PDP, in which discharge is achieved by the impact of hot electrons on phosphors, provides a higher brightness and a higher light emission efficiency than cold cathode PDPs.
An AC PDP, which uses an AC pulse to perform discharge, is also widely used in the art.
However, an AC PDP has a weak cell discharge compared to a DC PDP. As a result, the cell discharge is more difficult to maintain and the temperature of the panel is raised due to the slower time of cell discharge. Thus, the life span of the panel is shortened.
In the past, attempts have been made to address this problem by using AC drive. However, AC drive is not quite perfect and causes some problems.
First, the response speed is not as fast as a DC drive. For example, the transition from the ON to OFF state requires approximately 30 ms when an AC drive is used. This is much longer than the transition time of 20 ms to 8 ms obtained by a DC drive.
Second, the secondary capacitor generation problem is generated due to the breakdown of the DFT (discharge firing transistor) for a DC PDP. On the other hand, the secondary capacitor problem is not generated in an AC PDP because of the use of an AC drive.
Third, the cell


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