Backlight Unit Power Wire Segmentation for WWAN Noise

The power transmitting wire is divided into multiple circuit patterns (first, second, and third circuit patterns) with different widths instead of using a single uniform pattern. This segmentation allows each pattern to contribute differently to impedance characteristics, creating a frequency-selective filtering effect that reduces electromagnetic noise in the WWAN band while maintaining power transmission functionality.

Different sections of the power transmitting wire are designed with different circuit pattern widths to create varying impedance characteristics along the transmission path. The first circuit pattern has a wider width for lower impedance, the second has intermediate width, and the third has narrower width for higher impedance, creating a gradient filtering effect that targets specific frequency ranges including the WWAN band.

The power transmitting wire is divided into multiple circuit patterns (first, second, and third circuit patterns) with different widths instead of using a single uniform pattern. This segmentation allows each pattern to contribute differently to impedance characteristics, creating a frequency-selective filtering effect that reduces electromagnetic noise in the WWAN band while maintaining power transmission functionality.

The circuit pattern widths are specifically designed with different values (first pattern: wider, second pattern: intermediate, third pattern: narrower) to create varying impedance characteristics. This parameter variation creates a frequency-selective filtering effect that increases impedance at WWAN frequencies while maintaining adequate power transmission capability across the frequency spectrum.