Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2000-06-30
2001-10-16
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169300, C345S080000, C345S055000, C345S204000, C345S212000
Reexamination Certificate
active
06304038
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for driving a display panel such as AC driving type plasma display panel or electroluminescence display panel.
2. Description of Related Art
Recently, display apparatuses using a display panel have been put into practical use as a wall-mounted TV. Examples of such display panels are a plasma display panel, and an electroluminescence display panel, or the like in which capacitive light emitting devices are arranged in the form of a matrix.
There, however, is a problem that when pixel data pulses are applied to column electrodes of a display panel such as plasma display panel or electroluminescence display panel having the capacitive light emitting devices, a charge or a discharge is created, due to a parasitic capacitance existing between the column electrodes, by a potential difference occurring between the column electrodes, so that a reactive power is consumed.
When the number of column electrodes is increased to display a high quality television image, the number of pixel data pulses to be applied to the column electrodes also increases in accordance with the increased number of columns. When this occurs, electric power consumption also increases. A driving apparatus, therefore, which can apply the pixel data pulses to the display panel while suppressing the electric power consumption is demanded at present.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the invention to provide a driving apparatus of a display panel, in which electric power consumption at the time a pixel data pulse is generated can be reduced.
According to the invention, there is provided a driving apparatus for a display panel having a plurality of row electrodes and a plurality of column electrodes arranged so as to cross the row electrodes, in which a pixel data pulse corresponding to a video signal is applied to each of the column electrodes of the display panel, comprising: a power supply circuit which comprises a capacitor, a first switching current path for selectively discharging charges stored in the capacitor and supplying them to a power line, a second switching current path for selectively applying a power potential to the power line, a third switching current path for selectively charging the charges stored on the column electrodes into the capacitor via the power line, and a fourth switching current path for selectively connecting the power line to the ground only for a short predetermined period of time; and a pixel data pulse generating circuit for generating the pixel data pulses onto the column electrodes by connecting the power line with the column electrodes only for a predetermined period of time in response to the video signal.
REFERENCES:
patent: 5517207 (1996-05-01), Kawada et al.
patent: 5739641 (1998-04-01), Nakamura
patent: 5943030 (1999-08-01), Minamibayashi
patent: 6072447 (2000-06-01), Noborio
patent: 6215463 (2001-04-01), Matsumoto et al.
Ide Shigeo
Iwami Takashi
Philogene Haissa
Pioneer Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
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