Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
1999-08-25
2001-02-20
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C345S055000, C345S103000
Reexamination Certificate
active
06191533
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a plasma display panel (PDP), and more particularly, to an apparatus and method thereof for discharging a PDP display with a time-lag thereby reducing the instantaneous power consumption.
2. Description of the Related Art
Plasma displays have emerged as one of the dominant flat-panel display technologies. PDPs used for personal computers have proven to be small, light, and highly efficient. The term PDP refers to an electronic display device in which neon light emitted by applying a voltage between positive and negative electrodes while a gas such as Ne+Ar or Ne+Xe is filled in a hermetically sealed space between a front glass and rear glass partition. PDP displays have been successfully used over a very wide range of products. For example, PDPs have been used for factory automation (FA), ticket vending machines, and as an oil gauge in a gas station.
FIG. 1
shows the structure of the sub field and the television field of a plasma display panel.
Each of the pixels comprising an image should be discharged in order to display the image on the PDP. Conventional PDP displays simultaneously discharge all of the pixels comprising the display. High power on the order of 200 W (in the case of a 42 inch screen) should be applied to the panel in order to simultaneously discharge all of the pixels.
In accordance with conventional technology, one field of a television screen includes eight sub fields in order to show the brightness of an image displayed on the screen. As shown in
FIG. 1
, one sub field is comprised of a blank period, an erase period, an address period, and a sustain period. The respective pixels which constitute the screen display are simultaneously discharged, thus consuming significant power during the sustain period in which an image is substantially displayed on the PDP.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an apparatus and associated method for discharging pixels in a plasma display panel (PDP) with a time-lag by dividing the horizontal lines of the PDP into two or more parts and discharging each part with a time lag therebetween, thus reducing the instantaneous power consumption.
Accordingly, to achieve the above object, there is provided an apparatus according to the invention for discharging a plasma display panel with a time-lag based on a horizontal line division, the apparatus includes a signal processor for separating a vertical synchronous signal of a first horizontal line from a received video signal and delaying the separated synchronous signal of the first horizontal line in order to delay the discharge time of a next horizontal line, a data controller for generating a discharge pulse for discharging pixels of the first horizontal line according to the vertical synchronous signal, and a discharge pulse for discharging pixels of a second horizontal line responsive to the delayed vertical synchronous signal, and a displayer for discharging the first horizontal line and the second horizontal line by the respective discharge pulses with a time-lag defined by the delayed vertical synchronous signal and displaying the horizontal lines.
To achieve the above-described object, according to the present invention, there is provided a method for discharging a plasma display panel with a time-lag of a first horizontal line relative to a second horizontal line, including the steps of (a) determining whether to discharge pixels in the first horizontal line and (b) determining whether to discharge pixels in a second horizontal line the moment the pixels of the first horizontal line are discharged according to the determination in step (a), wherein pixels of a horizontal line to be discharged are determined and then pixels of a next horizontal line to be discharged are determined the moment the pixels of the horizontal line are discharged.
REFERENCES:
patent: 5534892 (1996-07-01), Tagawa
patent: 5617113 (1997-04-01), Prince
patent: 5844538 (1998-12-01), Shiraki et al.
patent: 5886677 (1999-03-01), Woo
patent: 5907314 (1999-05-01), Negishi et al.
patent: 8-106854 (1996-04-01), None
Kim Hak-yong
Kim Yeong-Jae
Dilworth & Barrese LLP
Dinh Trinh Vo
Samsung Electronics Co,. Ltd.
Wong Don
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