Driving circuit for powering light sources
AssigneeO2 Micro, Inc.
InventorsDa Liu, Yung-Lin Lin
Life of this patent
Estimating the term…
Abstract
There is provided a driving circuit for powering a plurality of light sources. The driving circuit includes a power converter, a plurality of switching regulators and a plurality of switching balance controllers. The power converter is operable for receiving an input voltage and for providing a regulated voltage to the light sources. The switching regulators are operable for adjusting forward voltages of the light sources respectively. The switching balance controllers are operable for generating pulse modulation signals to control the switching regulators respectively.
Claims20
A driving circuit for powering a plurality of light emitting diode (LED) strings, comprising:
- a power converter operable for receiving an input voltage and for providing a regulated voltage to said plurality of LED strings;
- a plurality of switching regulators coupled to said power converter and for adjusting a plurality of forward voltages of said plurality of LED strings respectively;
- and
- a plurality of switching balance controllers coupled to said plurality of switching regulators and for generating a plurality of pulse modulation signals to control said plurality of switching regulators respectively.
A display system comprising:
- a liquid crystal display (LCD) panel;
- a plurality of light emitting diode (LED) strings for illuminating said LCD panel;
- a power converter operable for receiving an input voltage and for providing a regulated voltage to said plurality of LED strings;
- a plurality of switching regulators coupled to said power converter and for adjusting a plurality of forward voltages of said plurality of LED strings respectively;
- and
- a plurality of switching balance controllers coupled to said plurality of switching regulators and for generating a plurality of pulse modulation signals to control said plurality of switching regulators respectively.
A method for powering a plurality of LED strings, comprising:
- converting an input voltage to a regulated voltage;
- applying said regulated voltage to said plurality of LED strings to produce a plurality of LED currents flowing through said LED strings respectively;
- adjusting a plurality of forward voltages of said plurality of LED strings respectively by a plurality of switching regulators;
- and
- controlling said plurality of switching regulators by a plurality of pulse modulation signals respectively.
Dependencies are inferred from the claim text.