Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1980-10-20
1982-09-21
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
340768, G09F 9313, H05B 4100
Patent
active
043509320
ABSTRACT:
A method for suppressing the objectionable visual flash associated with replacing patterns in a "plasma-charge-transfer" shift mechanism type AC plasma shift display panel. During the erase mode, the load mode, or both, the phase voltage repetition rate is reduced until the time average luminous flux is substantially below the level of human perception in a room ambient light background. Upon entry into the hold mode, the phase voltage repetition rate reverts to a high frequency. The rapid rate generates patterns in the display panel which have a time average luminous flux adequate for viewing in the ambient light background. The visual flash is thereby suppressed without degrading the normal display characteristics of the panel.
REFERENCES:
patent: 3781600 (1973-12-01), Coleman et al.
patent: 4051409 (1977-09-01), Craycraft
patent: 4132924 (1979-01-01), Yamaguchi et al.
Coleman William E.
Hall Stacy W.
Cavender J. T.
Dalton Philip A.
LaRoche Eugene R.
NCR Corporation
Salys Casimer K.
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