Patent ID: 9685557
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A method of fabricating thin-film transistors (TFTs) for a display having an array of pixels, the method comprising: placing a first photoresist mask over a TFT stack including a conductive gate layer, and a semiconducting layer, the mask having a thicker portion of photoresist covering a pixel area, and the mask having a half tone mask with a thicker portion of photoresist and a thinner portion of photoresist near edge covering an area surrounding the pixel area; asking a top portion of the first photoresist mask such that the thinner portion of the photoresist is removed; etching a portion of the conductive gate layer to expose a portion of the semiconductor layer; and doping the semiconductor layer with a first doping dose such that a length of light drain doping (LDD) region in the pixel area is shorter than a length of the LDD in the area surrounding the pixel area.