Transistor, liquid crystal display device, and manufacturing method thereof
First Claim
1. A display device comprising:
- a transistor comprising a gate electrode, a source electrode, a drain electrode, and a semiconductor layer;
a first wiring electrically connected to the gate electrode, the first wiring extending in a first direction;
a second wiring electrically connected to the source electrode, the second wiring extending in a second direction and intersecting the first wiring;
a pixel electrode electrically connected to the drain electrode; and
a capacitor wiring having a first part extending in parallel with the first direction, and second and third parts each extending in parallel with the second direction,wherein the pixel electrode has a first edge portion overlapping with the first part of the capacitor wiring, a second edge portion overlapping with the second part of the capacitor wiring, and a third edge portion overlapping with the third part of the capacitor wiring,wherein the semiconductor layer overlaps with the first wiring, the second wiring, the pixel electrode, and the capacitor wiring, andwherein the semiconductor layer overlaps with an entirety of the pixel electrode.
1 Assignment
0 Petitions
Accused Products
Abstract
Photolithography and etching steps for forming an island-shaped semiconductor layer are omitted, and a liquid crystal display device is manufactured with four photolithography steps: a step of forming a gate electrode (including a wiring formed using the same layer as the gate electrode), a step of forming source and drain electrodes (including a wiring formed using the same layer as the source and drain electrodes), a step of forming a contact hole (including the removal of an insulating layer and the like in a region other than the contact hole), and a step of forming a pixel electrode (including a wiring formed using the same layer as the pixel electrode). By the reduction in the number of photolithography steps, a liquid crystal display device can be provided at low cost and high productivity. Formation of a parasitic channel is prevented by an improvement in shape and potential of a wiring.
164 Citations
17 Claims
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1. A display device comprising:
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a transistor comprising a gate electrode, a source electrode, a drain electrode, and a semiconductor layer; a first wiring electrically connected to the gate electrode, the first wiring extending in a first direction; a second wiring electrically connected to the source electrode, the second wiring extending in a second direction and intersecting the first wiring; a pixel electrode electrically connected to the drain electrode; and a capacitor wiring having a first part extending in parallel with the first direction, and second and third parts each extending in parallel with the second direction, wherein the pixel electrode has a first edge portion overlapping with the first part of the capacitor wiring, a second edge portion overlapping with the second part of the capacitor wiring, and a third edge portion overlapping with the third part of the capacitor wiring, wherein the semiconductor layer overlaps with the first wiring, the second wiring, the pixel electrode, and the capacitor wiring, and wherein the semiconductor layer overlaps with an entirety of the pixel electrode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A display device comprising:
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a transistor comprising a gate electrode, a source electrode, a drain electrode, and a semiconductor layer; a first wiring electrically connected to the gate electrode, the first wiring extending in a first direction; a second wiring electrically connected to the source electrode, the second wiring extending in a second direction and intersecting the first wiring; an interlayer insulating over the semiconductor layer, the first wiring and the second wiring, the insulating layer being partly in contact with the semiconductor layer; a pixel electrode electrically connected to the drain electrode, the pixel electrode being provided over the insulating layer; and a capacitor wiring having a first part extending in parallel with the first direction, and second and third parts each extending in parallel with the second direction, wherein the pixel electrode has a first edge portion overlapping with the first part of the capacitor wiring, a second edge portion overlapping with the second part of the capacitor wiring, and a third edge portion overlapping with the third part of the capacitor wiring, wherein the semiconductor layer overlaps with the first wiring, the second wiring, the pixel electrode, and the capacitor wiring, and wherein the semiconductor layer overlaps with an entirety of the pixel electrode. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A display device comprising:
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a transistor comprising a gate electrode, a source electrode, a drain electrode, and a semiconductor layer; a first wiring electrically connected to the gate electrode, the first wiring extending in a first direction; an interlayer insulating layer provided between the gate electrode and the semiconductor layer, the insulating layer being in contact with the semiconductor layer; a second wiring electrically connected to the source electrode, the second wiring extending in a second direction and intersecting the first wiring; a pixel electrode electrically connected to the drain electrode; and a capacitor wiring having a first part extending in parallel with the first direction, and second and third parts each extending in parallel with the second direction, wherein the pixel electrode has a first edge portion overlapping with the first part of the capacitor wiring, a second edge portion overlapping with the second part of the capacitor wiring, and a third edge portion overlapping with the third part of the capacitor wiring, wherein the semiconductor layer overlaps with the first wiring, the second wiring, the pixel electrode, and the capacitor wiring, and wherein the semiconductor layer overlaps with an entirety of the pixel electrode. - View Dependent Claims (15, 16, 17)
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Specification