US 8,427,073 B2 · LED driving circuit and backlight module

Abstract

A LED driving circuit and a backlight module using the same are disclosed. The LED driving circuit comprises a LED module and a current controlling unit. The LED module has a plurality of the LED strings, each having a driving terminal. The current controlling unit has a plurality of current balancing terminal coupled to the driving terminal, for balancing the currents flowing through the LED strings. The current controlling unit receives a mode switch signal, controls the amount of the currents of the LED strings about a first current value when the mode switch signal represent a first mode, and controls the amount of the currents of the LED strings about a second current value when the mode switch signal represent a second mode.

Claims14

Dependent claims

A LED driving circuit, comprising:

a LED module, comprising a plurality of LED strings, each LED string having a driving terminal;
and
a current controlling element, having a plurality of current balancing terminal respectively coupled to the plurality of driving terminal for balancing an amount of current flowing through each of the plurality of the LED strings;
wherein, the current controlling element receives a mode switch signal, and accordingly controls the amount of the currents of the LED strings at a first current value when the mode switch signal represent a first mode, and controls the amount of the currents of the LED strings at a second current value when the mode switch signal represent a second mode,
wherein, the first current value and the second current value are larger than zero.

2 more elements

Dependencies are inferred from the claim text.

LED driving circuit and backlight module

Life of this patent

LED driving circuit and backlight module

Life of this patent

Abstract

Claims14