此篇論文製作一個高精確度匹配電流LED驅動電路晶片。藉由本篇論文提出的高精度晶片佈局技術幫助下，各通道間的LED電流可達到極為精確的匹配，對製程、溫度、電壓(PVT)變異擁有高容忍度。本論文採用數位脈衝寬度調變(Digital Pulse Width Modulation，DPWM)方式，利用人眼視覺暫留的現象以完成定電流LED亮度調整，避免色彩偏移(Color Shift)問題，且具有線性調光功能。
即使在包含高壓電晶體的情況下，經由量測後發現LED各通道的電流最大變動量僅僅在 -0.385%~0.372% 之間，優於其他常規的表現。本篇論文的LED電流溫度係數，在-40℃~160℃之間的範圍及20mA的電流下低於25ppm/℃。本晶片使用TSMC製程為0.25μm 1P3M CMOS 60V製程，晶片面積為1.15*1.9mm2。

In this thesis, a LED driver with precise current matching is proposed. Through the help of highly matched layout scheme, the accurately matched LED currents for multi-channel are achieved with high tolerance to process, temperature and voltage (PVT) variations. The color shift problem of LED brightness can be avoided by using digital pulse width modulation (DPWM) control, and the DPWM technique has capability of linear dimming.
Even with high voltage MOSFETs, the maximum current mismatch among LED channels is measured to be merely -0.385%~0.372% which is much better than those of the conventional ones. The temperature coefficient of this circuit is as low as 25ppm/℃ over -40℃ ~ 160℃ range for 20mA LED driving current. This circuit was fabricated in TSMC 0.25μm 60V high voltage 1P3M cmos process with a chip size of 1.15*1.9mm2.

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