Patent ID: 9638993
Date: 2017-05-02
CPC Classifications: G03F,H01L

Claim:
1. A phase-shift mask used for forming a source, a drain and a data line of a thin film transistor, comprising a light shading region which is covered by a light shading pattern and a light transmission region which is not covered by the light shading pattern, the light shading pattern comprises a symmetrical part and an asymmetrical part provided on an outside portion of the symmetrical part, wherein the symmetrical part is symmetrical about a symmetrical axis and the symmetrical part comprises a source pattern for forming the source and a drain pattern for forming the drain, and the asymmetrical part is asymmetrical about the symmetrical axis and the asymmetrical part comprises a data line pattern for forming the data line and a connection part pattern for forming a connection part between the data line and the source, wherein the source pattern is a U-shaped pattern, and the drain pattern is a stick-shaped pattern inserted into a recessed part of the U-shaped pattern, and wherein, an optical blocking unit that is asymmetrical about the light shading pattern is provided in the light transmission region on another outside portion of the symmetrical part away from the asymmetrical part, so that intensity of light transmitted through the part of the light transmission region provided with the optical blocking unit is reduced.