Display device with light blocking layer and manufacturing method thereof

A display device, comprising:

• a light blocking layer on a first substrate;
• a buffer layer on the light blocking layer;
• a semiconductor layer on the buffer layer;
• a dummy metal layer on and directly contacting the semiconductor layer, the dummy metal layer including an opening exposing an entirety of a channel region of the semiconductor layer;
• an insulating layer on the semiconductor layer in the opening and not directly contacting the dummy metal layer;
• a source/drain metal layer on the insulating layer, the source/drain metal layer comprising a non-overlap region that does not overlap the light blocking layer, and overlaps the semiconductor layer;
• and
• a gate metal layer on the insulating layer,
• wherein no portion of the dummy metal layer overlaps the gate metal layer in any part of the channel region of the semiconductor layer.