Patent ID: 8754418
Filing Date: 2014-06-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a pixel thin film transistor of a first conductive type; a driver circuit thin film transistor of the first conductive type; a driver circuit thin film transistor of a second conductive type that differs from the first conductive type; a first lightly doped drain region between at least either of a channel region and a source region of the driver circuit thin film transistor of the first conductive type, and the channel region and a drain region of the driver circuit thin film transistor of the first conductive type; and a second lightly doped drain region between at least either of a channel region and a source region of the pixel thin film transistor, and the channel region and a drain region of the pixel thin film transistor, wherein the first lightly doped drain region has impurities of the first conductive type at a first impurity concentration, wherein the channel region of the pixel thin film transistor and the channel region of the driver circuit thin film transistor of the first conductive type have impurities of the second conductive type at a second impurity concentration, which is lower than the first impurity concentration, and wherein the second lightly doped drain region has the impurities of the first conductive type at the first impurity concentration and the impurities of the second conductive type at the second impurity concentration.