Uniform luminance light-emitting diode circuit board

A uniform luminance light-emitting diode (LED) circuit board, comprising:

• a substrate;
• a first primary trace mounted on the substrate;
• a second primary trace mounted on the substrate and spaced apart from the first primary trace;
• multiple LED strings sequentially mounted on the substrate with two ends of each LED string electrically connected to the first primary trace and the second primary trace respectively and parallelly connected between the first primary trace and the second primary trace;
• a first power trace mounted on the substrate and electrically connected to the first primary trace;
• a second power trace mounted on the substrate and electrically connected to the second primary trace;
• and
• a first auxiliary trace mounted on the substrate with two ends of the first auxiliary trace electrically connected to the second primary trace and the second power trace respectively;
• wherein trace widths of the first primary trace and the second primary trace are wider than trace widths of the first power trace, the second power trace and the first auxiliary trace.