Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2006-03-16
2008-10-21
Owens, Douglas W. (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S291000
Reexamination Certificate
active
07439679
ABSTRACT:
A method and apparatus for controlling a plurality of light sources (102,103,104,105) in an electronic device (100) is provided. In one embodiment, the plurality of light sources (102,103,104,105) is used to backlight an illuminated display (101). As switching multiple light sources on simultaneously can cause output voltages of power sources (219) to drop, thereby potentially affecting the overall operation of the electronic device (100), an illumination controller (107) distributes actuation times associated with illumination control signals (204,205,206,207) such that each actuation time is unique. A control signal generator (201) produces a control signal (202) having light source actuation information stored therein. The illumination controller (107) then generates a plurality of illumination control signals (204,205,206,207) that are capable of actuating the plurality of light sources (102,103,104,105). Each illumination control signal (204,205,206,207) has a duty cycle and actuation time associated therewith. The illumination controller (107) distributes the actuation times across the control signal (202) so as to reduce the instantaneous current drawn by the plurality of light sources (102,103,104,105).
REFERENCES:
patent: 5970419 (1999-10-01), Terashima et al.
patent: 6119023 (2000-09-01), Tomiyori
patent: 6404145 (2002-06-01), Saito
patent: 6798395 (2004-09-01), Yamauchi et al.
patent: 6873203 (2005-03-01), Latham et al.
patent: 7076234 (2006-07-01), Grivas et al.
patent: 2002/0048169 (2002-04-01), Dowling et al.
patent: 2005/0057539 (2005-03-01), Ong
patent: 2005/0122060 (2005-06-01), Yu et al.
patent: 2005/0218838 (2005-10-01), Lys
patent: 2005/0231633 (2005-10-01), Yuyama et al.
patent: 2005/0253799 (2005-11-01), Kamio
Cholewin Erik A.
Grivas Chris J.
Lundholm Andrew S.
A Minh Dieu
Burrus, IV Philip H.
Motorola Inc.
Owens Douglas W.
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