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Improving ZnO in Plasma ZnO Display Devices

IP.com Disclosure Number: IPCOM000076527D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

O'Hanlon, JF: AUTHOR [+2]

Abstract

In the display device arrangement shown, plasma 1 which may be generated remotely, acts to illuminate phosphor layer 3 of drain electrode 5, when allowed to come into contact therewith. With the plasma essentially at ground potential, and a potential applied to any of the electrodes 5, 7 and 9, a sheet around the biased electrode may be created. The dimensions of the sheet are determined by the rate at which charge is injected into the sheet and, the voltage across the sheet, in a manner consistent with space charge limited current flow. With control or gate electrodes 7 and 9 biased negatively by voltage source 11, an electron depleted sheet is created, as a function of the magnitude of bias.

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Improving ZnO in Plasma ZnO Display Devices

In the display device arrangement shown, plasma 1 which may be generated remotely, acts to illuminate phosphor layer 3 of drain electrode 5, when allowed to come into contact therewith. With the plasma essentially at ground potential, and a potential applied to any of the electrodes 5, 7 and 9, a sheet around the biased electrode may be created. The dimensions of the sheet are determined by the rate at which charge is injected into the sheet and, the voltage across the sheet, in a manner consistent with space charge limited current flow. With control or gate electrodes 7 and 9 biased negatively by voltage source 11, an electron depleted sheet is created, as a function of the magnitude of bias. Whenever the sheet dimension above the control electrodes 7 and 9 is insufficient to create an electron depletion region above drain electrode 5, electron current will flow across the phosphor to emit light in those areas exposed to electron bombardment. When the bias upon control electrodes 7 and 9 is sufficiently large to create a control sheet which covers drain electrode 5, current will shut off. By maintaining phosphor layer 3 at a potential more positive than the plasma potential at all times via source 13, degradation of the phosphor is avoided. The latter is due to the fact that any possible positively charged sputtered particles are repelled from the positively biased phosphor and, selectively attracted to the negatively...