Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2005-05-31
2005-05-31
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169100, C345S060000, C345S204000
Reexamination Certificate
active
06900598
ABSTRACT:
When a gas discharge panel is driven, a voltage is applied between scan and address electrode groups to perform set-up. The voltage waveform has four intervals. In a first interval, the voltage is raised in a short time (less than 10 μs) to a first voltage, wherein 100 V≦first voltage<starting voltage. Then, in a second interval, the voltage is raised to a second voltage no less than the starting voltage and with an absolute gradient smaller than that for the voltage rise in the first interval (no more than 9 V/μs). Next, in a third interval, the voltage is lowered in a short time (no more than 10 μs) from the second voltage to a third voltage no more than the starting voltage. Following this, in a fourth interval, the voltage is lowered still further (for 100 μs to 250 μs) with a gradient smaller than that for the voltage fall in the third interval. The time occupied by the whole voltage waveform should be no more, than 360 μs. This means that a wall charge can be properly accumulated, allowing stable addressing to be performed even when the pulse applied during the address period is short (no more than 1.5 μs). This lengthens the discharge sustain period and improves luminance.
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Hibino Junichi
Higashino Hidetaka
Miyashita Kanako
Nagao Nobuaki
Ookawa Masafumi
Alemu Ephrem
Matsushita Electric Company Co., Ltd.
Wong Don
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