BACKLIGHT DRIVER OF DRIVING LIGHT-EMITTING DIODE STRING FOR DECREASING HEAT DISSIPATION AND METHOD OF CONTROLLING THE SAME
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United States of America Patent
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Issued Date -
Mar 27, 2025
app pub date -
Sep 22, 2023
filing date -
Sep 22, 2023
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Abstract
According to an embodiment of the invention, a backlight driver of driving a light-emitting diode (LED) string via a driving transistor in a load path is provided. The LED string, the driving transistor, and an electrical load are coupled to form the load path. The backlight driver includes a current regulator and a headroom detection circuit. The current regulator is coupled to the driving transistor and the first terminal of the electrical load to control a driving current flowing through the load path according to at least a feedback voltage from a first terminal of the electrical load. The headroom detection circuit is coupled to the first terminal of the electrical load and a voltage regulator to control the voltage regulator to regulate a supply voltage to a first terminal of the LED string according to at least the feedback voltage.
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