Liquid crystal display device having a common electrode as a black matrix
First Claim
1. A liquid crystal display device comprising:
- an active matrix substrate comprising;
a gate line;
a data line intersecting the gate line;
a thin-film transistor formed at an intersection of the gate line and the data line;
a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; and
a common electrode overlapped with the second portion of the conductive layer, the common electrode being a black matrix;
an opposed substrate that is opposed to the active matrix substrate;
a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and
a storage capacitor formed between an overlapping portion of the common electrode and the second portion of the conductive layer with an insulating film interposed therebetween.
1 Assignment
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Accused Products
Abstract
In a liquid crystal display device which performs image display by controlling a liquid crystal layer by a lateral electric field that is parallel with a substrate, the lateral electric field is formed by a black matrix and a pixel electrode. That is, a common electrode and a black matrix are commonized which are separately provided conventionally. Further, a storage capacitor is formed in an area where the black matrix and a pixel line coextend with a third interlayer insulating film interposed in between. Since the storage capacitor is formed by using all the area where a thin-film transistor is covered with the black matrix, sufficient capacitance can be secured even if the widths of electrodes and wiring lines are reduced in the future.
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Citations
42 Claims
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1. A liquid crystal display device comprising:
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an active matrix substrate comprising; a gate line; a data line intersecting the gate line; a thin-film transistor formed at an intersection of the gate line and the data line; a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; and a common electrode overlapped with the second portion of the conductive layer, the common electrode being a black matrix; an opposed substrate that is opposed to the active matrix substrate; a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and a storage capacitor formed between an overlapping portion of the common electrode and the second portion of the conductive layer with an insulating film interposed therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display device comprising:
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an active matrix substrate comprising; a gate line; a data line intersecting the gate line; a thin-film transistor formed at an intersection of the gate line and the data line, the thin-film transistor having, as an active layer, a crystalline silicon film; a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; and a common electrode overlapped with the second portion of the conductive layer, the common electrode being a black matrix; an opposed substrate that is opposed to the active matrix substrate; a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and storage capacitor formed between an overlapping portion of the common electrode and the second portion of the conductive layer with an insulating film interposed therebetween. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A liquid crystal display device comprising:
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an active matrix substrate comprising; a gate line; a data line intersecting the gate line; a thin-film transistor formed at an intersection of the gate line and the data line; a first insulating film and a second insulating film formed above the thin-film transistor; a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; and a common electrode overlapped with the second portion of the conductive layer, the common electrode being a black matrix; an opposed substrate that is opposed to the active matrix substrate; a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and a storage capacitor formed between an overlapping portion of the common electrode and the second portion of the conductive layer with the second insulating film interposed therebetween, the part of the common electrode being located on the first insulating film. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A liquid crystal display device comprising:
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an active matrix substrate comprising; a gate line; a data line intersecting the gate line; a thin-film transistor formed at an intersection of the gate line and the data line, the thin-film transistor having, as an active layer, a crystalline silicon film; a first insulating film and a second insulating film formed above the thin-film transistor; a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; and a common electrode overlapped with the second portion of the conductive layer, the common electrode being a black matrix; an opposed substrate that is opposed to the active matrix substrate; a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and a storage capacitor formed between an overlapping portion of the common electrode and the second portion of the conductive layer with the second insulating film interposed therebetween, the part of the common electrode being located on the first insulating film. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A liquid crystal display device comprising:
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an active matrix substrate comprising; a gate line; a data line intersecting the gate line; a thin-film transistor formed at an intersection of the gate line and the data line; a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; a common electrode, the common electrode being a black matrix; and a capacitor-forming electrode; an opposed substrate that is opposed to the active matrix substrate; a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and a storage capacitor formed by at least a part of the capacitor-forming electrode and the second portion of the conductive layer with an insulating film interposed therebetween. - View Dependent Claims (38, 39)
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40. A liquid crystal display device comprising:
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an active matrix substrate comprising; a gate line; a data line intersecting the gate line; a thin-film transistor formed at an intersection of the gate line and the data line; a first insulating film and a second insulating film formed above the thin-film transistor; a conductive layer electrically connected to the thin-film transistor, the conductive layer including at least a first portion which functions as a pixel electrode and a second portion which extends in parallel with the gate line; a common electrode, the common electrode being a black matrix and parts of the common electrode being located on the first insulating film; and a capacitor-forming electrode; an opposed substrate that is opposed to the active matrix substrate; a liquid crystal layer held between the active matrix substrate and the opposed substrate, and driven by an electric field formed between the pixel electrode and the common electrode, the electric field having a component parallel with the active matrix substrate; and a storage capacitor formed by at least a part of the capacitor-forming electrode and the second portion of the conductive layer with the second insulating film interposed therebetween. - View Dependent Claims (41, 42)
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Specification