Semiconductor device and method of manufacturing the same
First Claim
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1. A display device comprising:
- a pixel portion comprising;
a transistor including a gate electrode and a semiconductor layer;
a first wiring on a same surface as the gate electrode;
a first electrode over the first wiring, and electrically connected to the first wiring and the semiconductor layer, the first electrode comprising a first titanium film, a first aluminum film over the first titanium film and a second titanium film over the first aluminum film;
a second electrode on a same surface as the first electrode, and electrically connected to the semiconductor layer; and
a pixel electrode over the second electrode, and electrically connected to the second electrode; and
an external input terminal portion comprising;
a second wiring on the same surface as the gate electrode; and
a third wiring over the second wiring, and electrically connected to the second wiring, the third wiring comprising a third titanium film, a second aluminum film over the third titanium film and a fourth titanium film over the second aluminum film.
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Abstract
The present invention improves the aperture ratio of a pixel of a reflection-type display device or a reflection type display device without increasing the number of masks and without using a blackmask. A pixel electrode (167) is arranged so as to partially overlap a source wiring (137) for shielding the gap between pixels from light, and a thin film transistor is arranged so as to partially overlap a gate wiring (166) for shielding a channel region of the thin film transistor from light, thereby realizing a high pixel aperture ratio.
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Citations
14 Claims
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1. A display device comprising:
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a pixel portion comprising; a transistor including a gate electrode and a semiconductor layer; a first wiring on a same surface as the gate electrode; a first electrode over the first wiring, and electrically connected to the first wiring and the semiconductor layer, the first electrode comprising a first titanium film, a first aluminum film over the first titanium film and a second titanium film over the first aluminum film; a second electrode on a same surface as the first electrode, and electrically connected to the semiconductor layer; and a pixel electrode over the second electrode, and electrically connected to the second electrode; and an external input terminal portion comprising; a second wiring on the same surface as the gate electrode; and a third wiring over the second wiring, and electrically connected to the second wiring, the third wiring comprising a third titanium film, a second aluminum film over the third titanium film and a fourth titanium film over the second aluminum film. - View Dependent Claims (2, 3)
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4. A display device comprising:
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a pixel portion comprising; a transistor; a first wiring on a same surface as a gate electrode of the transistor; a first electrode over the first wiring, and electrically connected to the first wiring and one of a source and a drain of the transistor, the first electrode comprising a first titanium film, a first aluminum film over the first titanium film and a second titanium film over the first aluminum film; a second electrode on a same surface as the first electrode, and electrically connected to the other of the source and the drain of the transistor; and a pixel electrode over the second electrode, and electrically connected to the second electrode; and an external input terminal portion comprising; a second wiring on the same surface as the gate electrode; and a third wiring over the second wiring, and electrically connected to the second wiring, the third wiring comprising a third titanium film, a second aluminum film over the third titanium film and a fourth titanium film over the second aluminum film. - View Dependent Claims (5)
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6. A display device comprising:
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a pixel portion comprising; a transistor including a gate electrode and a semiconductor layer; a first wiring on a same surface as the gate electrode; a first electrode over the first wiring, and electrically connected to the first wiring and the semiconductor layer; a second electrode on a same surface as the first electrode, and electrically connected to the semiconductor layer; and a pixel electrode over the second electrode, and electrically connected to the second electrode; and an external input terminal portion comprising; a second wiring on the same surface as the gate electrode; a third wiring on the same surface as the first electrode, and electrically connected to the second wiring; and a transparent conductive film on the same surface as the pixel electrode, and electrically connected to the third wiring. - View Dependent Claims (7, 8, 9, 10)
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11. A display device comprising:
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a pixel portion comprising; a transistor; a first wiring on a same surface as a gate electrode of the transistor; a first electrode over the first wiring, and electrically connected to the first wiring and one of a source and a drain of the transistor; a second electrode on a same surface as the first electrode, and electrically connected to the other of the source and the drain of the transistor; and a pixel electrode over the second electrode, and electrically connected to the second electrode; and an external input terminal portion comprising; a second wiring on the same surface as the gate electrode; a third wiring on the same surface as the first electrode, and electrically connected to the second wiring; and a transparent conductive film on the same surface as the pixel electrode, and electrically connected to the third wiring. - View Dependent Claims (12, 13, 14)
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Specification