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

Claim 14:
15. An organic light emitting display device, comprising:
a substrate;
a first thin film transistor on the substrate, the first thin film transistor including a first active layer formed of a low-temperature polysilicon, the first thin film transistor including another gate electrode;
a second thin film transistor on the substrate, the second thin film transistor including:
an active layer formed of an oxide semiconductor and including a source region, a channel region, and a drain region,
a gate insulating layer on the active layer, and
a gate electrode on the gate insulating layer and overlapping the active layer;
a light blocking layer disposed under the active layer and overlapping the active layer, the light blocking layer having a first portion below the channel region and a second portion that extends upward to horizontally overlap with at least a part of the active layer; 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 another gate electrode.