Patent ID: 7307317
Filing Date: 2007-12-11
Classification: G09G,H01L

Abstract:
1. An electronic device comprising: a first logic circuit having a first thin film transistor over an insulating surface; a second logic circuit having a second thin film transistor over the insulating surface; and a detection means which detects a first operating frequency of the first logic circuit and a second operating frequency of the second logic circuit, and which outputs a first detection result to a first threshold value control circuit and a second detection result to a second threshold value control circuit, wherein the first thin film transistor comprises a first gate electrode inputted with a first logic signal and a second gate electrode inputted with a first threshold value control signal from the first threshold value control circuit, wherein the second thin film transistor comprises a third gate electrode inputted with a second logic signal and a fourth gate electrode inputted with a second threshold value control signal from the second threshold value control circuit, and wherein the first operating frequency is different from the second operating frequency.