This invention provides a precise current load device. A cell includes a power supply line, a ground line, first and second voltage supply lines, a signal line, first, third and fourth control lines, first to fourth switches, a p-type TFT, a capacitance element, and a current load element. A source of...http://www.google.de/patents/US7209101?utm_source=gb-gplus-sharePatent US7209101 - Current load device and method for driving the same
