Patent ID: 7288818
Filing Date: 2007-10-30
Classification: H01L

Abstract:
1. A thin film transistor comprising: source and drain electrodes and an semiconductor layer formed on a substrate, the semiconductor layer comprising a channel region between the source and drain electrodes; a gate electrode insulated from the source and drain electrodes and the semiconductor layer; and a gate insulator having a first portion formed between the gate electrode and each of the source and drain electrodes and having a second portion formed between the gate electrode and the channel region of the semiconductor layer, wherein the thickness of the first portion of the gate insulator where the gate electrode overlaps each of the source and drain electrodes is greater than the thickness of the second portion of the gate insulator where the gate electrode overlaps the channel region of the semiconductor layer, wherein the first portion comprises a plurality of layers, and at least one of the layers comprises a discontinuity near the gate electrode.