Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2008-05-06
2008-05-06
Owens, Douglas W. (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169100, C315S169300, C315S312000
Reexamination Certificate
active
11114122
ABSTRACT:
A clock signal synchronized with a data write signal for each scan line supplied from a light emission control circuit4to a scan driver6is supplied to an oscillator12generating a reference switching signal of a DC-DC converter8by a PWM method via a frequency divider14. Thus, even when a ripple component by a switching operation of the converter has been superimposed on a drive voltage Va, constantly the same gate-to-source voltage Vgs is supplied to a light emission drive transistor Tr2for each scan line, whereby a problem that a state in which light emission intensities differ for each scan line is brought about can be resolved. Further, the duty ratio of a switching signal from a PWM circuit11is detected by a detection circuit13to grasp the load condition of the converter, and when the load is light, the division ratio of the frequency divider14is increased to execute the switching operation at a low frequency. In this manner, the cycle (boost cycle) of the switching operation in the converter is made greater, so that a useless power loss by the switching operation in the converter can be reduced, whereby the power utilization rate of a light load time can be improved.
REFERENCES:
patent: 5172108 (1992-12-01), Wakabayashi et al.
patent: 6858992 (2005-02-01), Park et al.
patent: 6894436 (2005-05-01), Togashi et al.
patent: 7023415 (2006-04-01), Fujita et al.
patent: 7042164 (2006-05-01), Yazawa
patent: 7084848 (2006-08-01), Senda et al.
patent: 7088319 (2006-08-01), Yoshida et al.
patent: 7119768 (2006-10-01), Yazawa et al.
patent: 2004/0252087 (2004-12-01), Yazawa
patent: 2005/0012698 (2005-01-01), Takahashi
patent: 2005/0067553 (2005-03-01), Agari et al.
patent: 2005/0179627 (2005-08-01), Hayafuji et al.
patent: 2002-366101 (2002-12-01), None
patent: 2003-316315 (2003-11-01), None
Owens Douglas W.
Tohoku Pioneer Corporation
Tran Chuc
Westerman, Hattori, Daniels & Adrian , LLP.
LandOfFree
Light emitting display device and drive control method thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light emitting display device and drive control method thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light emitting display device and drive control method thereof will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3950821