CURRENT DISTRIBUTOR
First Claim
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1. A light emitting diode (LED) backlight system comprising:
- a mainboard;
a power supply disposed on the mainboard for supplying power;
a current source disposed on the mainboard and coupled to the power supply;
a backlight module comprising;
plural sets of LEDs, each set of LEDs comprising a plurality of serial connected LEDs;
a plurality of current adjustment units coupled to the plural sets of LEDs for distributing currents flowing through the plural sets of LEDs; and
a reference voltage adjustment unit coupled to the plurality of current adjustment units for controlling the plurality of current adjustment units according to a reference voltage;
a first power line coupled between the power supply and the plural sets of LEDs for supplying a high voltage to the plural sets of LEDs; and
a second power line coupled between the current source and the plurality of current adjustment units for transmitting current outputted from the plurality of current adjustment units to the current source.
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Abstract
A current distributor includes a plurality of current adjustment units and a reference voltage adjustment unit. The plurality of current adjustment units is for distributing currents flowing through plural sets of light emitting diodes. The reference voltage adjustment unit is coupled to the plurality of current adjustment units for controlling the plurality of current adjustment units according to a reference voltage.
15 Citations
15 Claims
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1. A light emitting diode (LED) backlight system comprising:
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a mainboard; a power supply disposed on the mainboard for supplying power; a current source disposed on the mainboard and coupled to the power supply; a backlight module comprising; plural sets of LEDs, each set of LEDs comprising a plurality of serial connected LEDs; a plurality of current adjustment units coupled to the plural sets of LEDs for distributing currents flowing through the plural sets of LEDs; and a reference voltage adjustment unit coupled to the plurality of current adjustment units for controlling the plurality of current adjustment units according to a reference voltage; a first power line coupled between the power supply and the plural sets of LEDs for supplying a high voltage to the plural sets of LEDs; and a second power line coupled between the current source and the plurality of current adjustment units for transmitting current outputted from the plurality of current adjustment units to the current source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A current distributor comprising:
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a plurality of current adjustment units for distributing currents flowing through plural sets of LEDs; and a reference voltage adjustment unit coupled to the plurality of current adjustment units for controlling the plurality of current adjustment units according to a reference voltage, the reference voltage adjustment unit comprising; a first amplifier having a positive input, a negative input and an output; a first resistor having a first end for receiving a high voltage and a second end coupled to the negative input of the first amplifier; a second resistor having a first end for receiving the high voltage and a second end coupled to the positive input of the first amplifier; a first diode having an anode and a cathode, the anode of the first diode being coupled to the negative input of the first amplifier; and a reference voltage source having a positive end coupled to the cathode of the first diode and a negative end for receiving a low voltage for providing the reference voltage. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification