Semiconductor device having multiple semiconductor layers
AssigneeJapan Display Inc.
InventorSatoshi Maruyama
Life of this patent
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Abstract
A display device having an improved display characteristics and reduced manufacturing cost is provided. The display device includes a plurality of pixels arranged on a surface of a substrate. The plurality of pixels each include: a light-emitting element; a driving transistor; a selecting transistor; and a retention capacitor. The driving transistor has a bottom-gate structure. The driving transistor has a semiconductor layer containing a first semiconductor. The retention capacitor has a first electrode and a second electrode. The first electrode doubles as a gate of the driving transistor. The second electrode is disposed at a lower layer than the first electrode and contains a second semiconductor.
Claims5
A semiconductor device comprising:
- a first transistor having a first semiconductor layer, a first conductive layer as a gate electrode, and a first insulating layer between the first semiconductor layer and the first conductive layer;
- a second transistor having a second semiconductor layer, a second conductive layer as a gate electrode, and a second insulating layer between the second semiconductor layer and the second conductive layer;
- and
- a capacitor having a third semiconductor layer as a first electrode, the first conductive layer as a second electrode, and the second insulating layer between the third semiconductor layer and the first conductive layer, wherein
- the first conductive layer and the second conductive layer are located in the same level,
- the first insulating layer covers the second transistor,
- the first semiconductor layer includes an oxide semiconductor having a first channel region,
- the second semiconductor layer includes a polycrystalline silicon having a second channel region,
- at least a part of the first channel region has a first channel length in a first direction,
- at least a part of the second channel region has a second channel length in a second direction, and
- the first direction and the second direction are the same.
Dependencies are inferred from the claim text.