Semiconductor device and manufacturing method of the same
First Claim
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1. A semiconductor device comprising:
- a first transistor comprising a gate electrode over a substrate;
a first electrode electrically connected to the first transistor, the first electrode being a pixel electrode;
a second transistor comprising a first gate electrode over the substrate;
a second electrode overlapping with the first gate electrode of the second transistor;
a third electrode over the substrate, the third electrode being supplied with a fixed potential, anda fourth electrode comprising a low-resistance oxide film over the substrate;
wherein the second electrode and the third electrode are formed by processing a same light-transmitting conductive film comprising a light-transmitting material,wherein a first capacitor is formed in a region where the first electrode and the third electrode overlap with each other with an insulating film provided therebetween, andwherein a second capacitor is formed in a region where the third electrode and the fourth electrode overlap with each other.
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Abstract
An object is to provide a display device with high productivity by reducing the number of masks and the number of steps. Another object is to provide a display device with high yield. A pixel transistor and a driver transistor are formed over a substrate having an insulating surface in the same step. A pixel electrode electrically connected to the pixel transistor is one electrode. The other electrode is supplied with a fixed potential. A region where a pair of electrodes overlap with each other is used as a capacitor. Accordingly, the number of masks and steps are reduced to provide a display device with high productivity.
119 Citations
24 Claims
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1. A semiconductor device comprising:
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a first transistor comprising a gate electrode over a substrate; a first electrode electrically connected to the first transistor, the first electrode being a pixel electrode; a second transistor comprising a first gate electrode over the substrate; a second electrode overlapping with the first gate electrode of the second transistor; a third electrode over the substrate, the third electrode being supplied with a fixed potential, and a fourth electrode comprising a low-resistance oxide film over the substrate; wherein the second electrode and the third electrode are formed by processing a same light-transmitting conductive film comprising a light-transmitting material, wherein a first capacitor is formed in a region where the first electrode and the third electrode overlap with each other with an insulating film provided therebetween, and wherein a second capacitor is formed in a region where the third electrode and the fourth electrode overlap with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a first transistor comprising a gate electrode over a substrate and a first oxide semiconductor layer over the gate electrode, the first oxide semiconductor layer comprising a channel formation region; a first electrode electrically connected to the first transistor, the first electrode being a pixel electrode; a second transistor comprising a first gate electrode over the substrate and a second oxide semiconductor layer over the first gate electrode, the second oxide semiconductor layer comprising a channel formation region; a first insulating film over the channel formation region of the first transistor and the channel formation region of the second transistor; a second insulating film over the first insulating film; a second electrode overlapping with the first gate electrode of the second transistor; a third electrode over the substrate, the third electrode being supplied with a fixed potential, and a fourth electrode comprising a low-resistance oxide film over the substrate, wherein the second electrode and the third electrode are formed by processing a same light-transmitting conductive film comprising a light-transmitting material, wherein a first capacitor is formed in a region where the first electrode and the third electrode overlap with each other with the second insulating film provided therebetween, and wherein a second capacitor is formed in a region where the third electrode and the fourth electrode overlap with each other. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A semiconductor device comprising:
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a first transistor comprising a gate electrode over a substrate; a first electrode electrically connected to the first transistor, the first electrode being a pixel electrode; a second transistor comprising a first gate electrode over the substrate; a second electrode overlapping with the first gate electrode of the second transistor; a third electrode over the substrate, the third electrode being supplied with a fixed potential; and a fourth electrode comprising a low-resistance oxide film over the substrate, wherein the second electrode and the third electrode are formed by processing a same light-transmitting conductive film comprising a light-transmitting material, wherein a first capacitor is formed in a region where the first electrode and the third electrode overlap with each other, and wherein a second capacitor is formed in a region where the third electrode and the fourth electrode overlap with each other. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification