Patent ID: 11971641
Assignee: SHARP DISPLAY TECHNOLOGY CORPORATION
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An active matrix substrate provided with a display region defined by a plurality of pixel regions, the active matrix substrate comprising:
a substrate;
a first thin film transistor (TFT) supported by the substrate and disposed on each of the plurality of pixel regions;
a first flattened layer covering the first TFT; and
a pixel electrode provided on the first flattened layer and electrically connected to the first TFT,
wherein the first TFT includes:
a lower gate electrode provided on the substrate,
a lower gate insulating layer covering the lower gate electrode,
an oxide semiconductor layer provided on the lower gate insulating layer, the oxide semiconductor layer including a channel region facing the lower gate electrode with the lower gate insulating layer interposed between the channel region and the lower gate electrode, and a source contact region and a drain contact region positioned, respectively, at either sides of the channel region,
an upper gate insulating layer provided on the channel region of the oxide semiconductor layer, and
an upper gate electrode provided on the upper gate insulating layer and facing the channel region of the oxide semiconductor layer with the upper gate insulating layer interposed between the channel region and the upper gate electrode,
wherein the active matrix substrate further comprises:
a first connection electrode configured to electrically connect the drain contact region of the oxide semiconductor layer and the pixel electrode, wherein:
the first flattened layer includes a pixel contact hole formed, such that to partially expose the first connection electrode,
a bottom face of the pixel contact hole at least partially overlaps, of a lower gate metal layer including the lower gate electrode and an upper gate metal layer including the upper gate electrode, at least the lower gate metal layer when viewed from a normal direction of the substrate, and
an entirety of the first connection electrode is formed from a transparent conductive material,
a part of the first connection electrode is in direct contact with the drain contact region of the oxide semiconductor layer, and
the active matrix substrate does not include a metal layer located above the pixel electrode.