Semiconductor device comprising pixel portion
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsHiroshi Shibata, Atsugo Isobe
Life of this patent
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Abstract
To provide a liquid crystal display device having high quality display by obtaining a high aperture ratio while securing a sufficient storage capacitor (Cs), and at the same time, by dispersing a load (a pixel writing-in electric current) of a capacitor wiring in a timely manner to effectively reduce the load. A scanning line is formed on a different layer from a gate electrode and the capacitor wiring is arranged so as to be parallel with a signal line. Each pixel is connected to the individually independent capacitor wiring via a dielectric. Therefore, variations in the electric potential of the capacitor wiring caused by a writing-in electric current of a neighboring pixel can be avoided, whereby obtaining satisfactory display images.
Claims14
A display device comprising a pixel portion, the pixel portion comprising:
- a scanning line and a source wiring crossed with each other over a substrate;
- and
- a semiconductor layer including a first portion, a second portion and a third portion between the first portion and the second portion,
- wherein the first portion extends in parallel with the scanning line and the second portion extends in parallel with the source wiring,
- wherein the first portion overlaps the scanning line and the second portion overlaps the source wiring, and
- wherein the third portion is narrower than the first portion and the second portion.
A display device comprising a pixel portion, the pixel portion comprising:
- a scanning line and a source wiring crossed with each other over a substrate;
- and
- a semiconductor layer including a first portion, a second portion and a third portion between the first portion and the second portion,
- wherein the first portion extends in parallel with the scanning line and the second portion extends in parallel with the source wiring,
- wherein the first portion overlaps the scanning line and the second portion overlaps the source wiring,
- wherein the first portion and the second portion extend at a right angle to each other, and
- wherein the third portion is narrower than the first portion and the second portion.
Dependencies are inferred from the claim text.