Patent ID: 11871616
Assignee: LG DISPLAY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. An organic light emitting display device, comprising:
a substrate including a first substrate, a second substrate, and an inorganic insulating layer disposed between the first substrate and the second substrate;
a first buffer layer on the substrate;
a first thin film transistor including a first active layer that is formed of a low-temperature polysilicon and includes a first source region, a first channel region, and a first drain region, a first gate electrode that overlaps the first active layer with a first gate insulating layer interposed therebetween, and a first source electrode and a first drain electrode that are electrically connected to the first active layer;
a second thin film transistor including a second active layer that is formed of an oxide semiconductor and includes a second source region, a second channel region, and a second drain region, a second gate electrode that overlaps the second active layer with a second gate insulating layer interposed therebetween, and a second source electrode and a second drain electrode that are electrically connected to the second active layer;
a storage capacitor including a first capacitor electrode that is disposed on a same layer as the first gate electrode, and a second capacitor electrode that overlaps the first capacitor electrode with a first interlayer insulating layer interposed therebetween; and
a light blocking layer disposed under the second active layer and overlapping a lower portion of the second active layer and formed on Men a same layer as the second capacitor electrode,
wherein steps are formed in the light blocking layer, which block light incident through a lower portion and a side surface of the second channel region; one or more protrusion patterns on at least a part of an insulating layer; and an interlayer insulating layer on the one or more protrusion patterns such that at least a portion of the interlayer insulating layer on the one or more protrusion patterns forms a stepped shape, wherein the one or more protrusion patterns is formed in a same layer as the first gate electrode.