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Slope Controlled Self Conditioning Waveform

IP.com Disclosure Number: IPCOM000050673D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Beidl, JR: AUTHOR [+2]

Abstract

When cells in a plasma display panel are erased, the wall charge that resides in the ON cells is reduced to zero. If the wall charge is not reduced to zero, it must at least be reduced to a point below a specific threshhold. Classical theory holds that this remaining wall charge will decay further towards zero rapidly in a few sustain cycles following the erase operation. Experience has shown that this decay does not always occur rapidly, and that this slowly decaying wall charge can cause problems if adjacent cells are written shortly after the erase operation. This problem may be controlled by careful gap control and slope write waveforms to minimize the adverse effects of the residual wall charge.

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Slope Controlled Self Conditioning Waveform

When cells in a plasma display panel are erased, the wall charge that resides in the ON cells is reduced to zero. If the wall charge is not reduced to zero, it must at least be reduced to a point below a specific threshhold. Classical theory holds that this remaining wall charge will decay further towards zero rapidly in a few sustain cycles following the erase operation. Experience has shown that this decay does not always occur rapidly, and that this slowly decaying wall charge can cause problems if adjacent cells are written shortly after the erase operation. This problem may be controlled by careful gap control and slope write waveforms to minimize the adverse effects of the residual wall charge.

Another proposed solution would be to improve the erase operation so that the wall charge is actually reduced to zero. This is not always possible for all cells with conventional erase waveforms. However, a waveform described by Stilwell and Schlig in the 1976 IEEE SID Biennial Display Conference Records, October 1976, page 121, described as a "self conditioning waveform," did produce an erase operation that reduced the wall charge for all cells to a point very close to zero, as shown in Fig. 1. The operation of this waveform is ideally suited as a solution to the residual wall charge problem. It is applied to all cells on the sustainer and turns ON all OFF cells and then erases them, while ignoring the ON cells. Since the residual wall charge resides with the cells just erased (OFF cells), this waveform neutr...