LED Circuit and Operation Method of the Same

A LED circuit comprising:

• a plurality of LED channels;
• a driving module to supply a driving voltage to the plurality of LED channels according to a feedback voltage;
• and
• a feedback-selecting module comprising:
• an open detection unit connected to the plurality of LED channels to perform an open detection mechanism to separate the plurality of LED channels into a plurality of open LED channels and a plurality of non-open LED channels having output voltages respectively;
• and
• a minimum-selecting unit comprising:
• a plurality of inputs each selectively connected to a high voltage higher than a predetermined value or one of the corresponding LED channel such that a first part of the inputs corresponding to the non-open LED channels receives the output voltage respectively and a second part of the inputs corresponding to the open LED channels receives the high voltage;
• and
• a comparing module to compare the output voltages and the high voltages to generate a comparison result;
• wherein the minimum-selecting unit selects a minimum output voltage from the output voltages and the high voltages as the feedback voltage according to the comparison result.

A LED circuit operation method adapted in a LED circuit, wherein the LED circuit comprises a plurality of LED channels and a driving module, the LED circuit operation method comprises the steps of:

• providing the driving module to supply a driving voltage to the plurality of LED channels according to a feedback voltage;
• performing an open detection mechanism to separate the plurality of LED channels into a plurality of open LED channels and a plurality of non-open LED channels having an output voltage respectively;
• and
• performing a selection mechanism to select a minimum output voltage as the feedback voltage from the output voltage of each of the plurality of non-open LED channels.