本篇論文主要聚焦可調光低閃爍之四通道高匹配電流LED驅動電路晶片，利用數位脈衝寬度調變(Digital Pulse Width Modulation，DPWM)方式作為可高度線性調光，並提出創新之演算法以降低閃爍，爾後搭配恆定電流方式再搭配抗溫度變異之參考電壓以驅動電路，避免產生色彩偏移(Color Shift)的現象。另一方面，考量晶片在製作上的變異情況，在論文中提出高精度佈局技巧於電流電晶體之上，使各通道之電流大小得以精準匹配，增加對製程、電壓、溫度(PVT)的容忍度。
在本論文架構中也增加了保護機制以及抗溫敏、抗電壓變異振盪器，並且利用AC-DC轉換器應用，以提高其實用性。本次晶片使用TSMC0.25μm 1P3M CMOS 60V高壓製程，晶片面積為1.76*1.37mm2。經實驗測試，所設計晶片效果優良，達成所有預設的規格。

A low flicker dimmable four-channel LED driver with precise current matching is proposed in this thesis. The architecture is capable to achieve highly linear dimming and reduce lighting flicker by using digital pulse width modulation(DPWM) along with an innovative dimmming structure. To avoid of color shift, current balancing and temperature-compensated voltage reference are adopted drive the LED strings. To conquer the msimatch problem caused by process variation, a 4th order common centroid layout is proposed for current-controlling mosfets to match the driving currents of four LED strings.
Low-voltage and high-temperature protection circuits as well as a temperature compensated relaxation oscillator are all embeded to make the driver much practical for usual applications. The chip is designed in a TSMC0.25μm 1P3M CMOS 60V high voltage 1P3M cmos process with a chip size of 1.76 * 1.37 mm2.

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