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发明授权
CN101350174B 匹配电流源的顺序标定的系统及方法 有权 转让

匹配电流源的顺序标定的系统及方法
摘要：
本发明公开了一种匹配电流源的顺序标定的系统及方法，其包括LED串和可编程电流源电路(CSC)。LED电流流过各LED串，各LED电流都由相关的可编程CSC控制。在一个实施方式中，CSC形成链。第一CSC将基准电流用于标定，其后将所述基准电流供应到下一CSC。当所述下一CSC检测到所述基准电流时，所述CSC将所述基准电流用于标定。沿着链逐一地对CSC进行标定。在第二实施方式中，各CSC能够接收来自共用导体的所述基准电流。如果检测到所述共用导体可用，则所述CSC将所述基准电流用于标定。当所述导体正在使用中，其它CSC检测所述导体为不可用并且不会试图自我标定。所述CSC逐一地、但以随时间变化的次序使用所述基准电流。
摘要（英）：

The present invention discloses a system and a method for sequential calibration of matched current sources. The system involves LED strings and programmable current source circuits (CSC). An LED current flows through each LED string. Each LED current is controlled by an associated programmable CSC. In one embodiment, the CSCs form a chain. A first CSC uses a reference current for calibration, and thereafter supplies the reference current to the next CSC. When the next CSC detects the reference current, it uses the reference current for calibration. CSCs are calibrated one by one down the chain. In a second embodiment, each CSC can receive the reference current from a common conductor. If the common conductor is detected to be available, then the CSC uses the reference current for calibration. When the conductor is in use, the other CSCs detect the conductor as unavailable and do not attempt to self-calibrate. The CSCs use the reference current one by one, but in an order that changesover time.

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