Current and charge leakage balancing device for display panel

Details Current and charge leakage balancing device for display panel Current and charge leakage balancing device for display panel

2003-04-28

2004-09-28

Vannucci, James (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S169100, C313S483000

Reexamination Certificate

active

06798151

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a current/charge leakage balancing device for display panel and, more particularly, a device that can eliminate and balance the residual charges between the lamps of the display panel module and the external metallic shield.
BACKGROUND OF THE INVENTION
A display device such as a liquid crystal display device is usually provided with a backlight radiating source formed by a plurality of lamps. As illustrated in
FIG. 1
, Rs
1
/Rs
2
are linear resistors (not necessarily identical). Meanwhile, C
1
, C
2
are the principal equivalent stray capacitors of the lamps (not necessarily identical). Due to several factors such as fabrication factors, structure factors, or wiring factors, C
1
and C
2
usually are not balanced. Rx
1
, Rx
2
represent the serial resistors of the equivalent stray capacitors. Because the backlight lamps usually need high frequency, high-voltage supply inverter, the equivalent circuit corresponding to the stray parasitic effects becomes more complex, and does not provide uniform and balanced allocation. The lamp currents that respectively pass through L
1
, L
2
therefore are not uniform due to the parasitic effects. As a result, the brightness and the gray scale of the display panel are not uniform and balanced, which not only alters the display quality, but also may undesirably affect the user's sight.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a waveform signal generator that can overcome the above disadvantages, and eliminate and balance the residual current and charges of the display panel.
To achieve the above and other objectives, the waveform signal generator of the invention is connected, either directly or through a cross-link element, to an external metallic shield of the display panel or a central layer of plastics. The waveform signal generator injects a signal to the central layer of plastics so as to eliminate and balance the residual current and charge of the display panel.
To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention, this detailed description being provided only for illustration of the invention.


REFERENCES:
patent: 6288496 (2001-09-01), Suzuki et al.
patent: 6570344 (2003-05-01), Lin

Affiliated with

Also associated with

Rating

Current and charge leakage balancing device for display panel does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Current and charge leakage balancing device for display panel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current and charge leakage balancing device for display panel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3191729