Liquid crystal display with TFT channel at gate source crossing and capacitor dividing pixel
First Claim
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1. A liquid crystal display device comprising:
- an array substrate;
a counter substrate provided opposite to said array substrate, said counter substrate having counter electrodes;
a liquid crystal contained between said array and counter substrates;
scanning lines provided on said array substrate;
signal lines running across said scanning lines through an insulator;
switching elements including thin film transistors provided in a matrix form at crossing areas where said scanning lines run across said scanning lines;
pixel electrodes provided in a matrix form in regions surrounded by said scanning and signal lines, said pixel electrodes being connected to said switching elements; and
storage capacitor lines disposed in parallel with said scanning lines;
wherein said storage capacitor lines divide said pixel electrodes into first regions and second regions and define storage capacitors overlapping with and extending along said signal lines,wherein each of said thin film transistors includes a semiconductor layer which is overlapped with and extended along said crossing area, an area adjacent thereto and said storage capacitor,wherein an end portion of said semiconductor layer is overlapped with said first region of said pixel electrode,wherein said semiconductor forms a channel at said crossing area, and includesa first contact portion between said signal line and one of said source and drain electrodes at a location in the vicinity of said channel, anda second contact portion between said first region and the other one of said source and drain electrodes at said end portion.
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Abstract
Signal lines are formed to cover semiconductor layers around gate electrodes of pixel switching elements thereby to shield the switching elements. The semiconductor layers connected to drain electrodes of the switching elements extend under the signal lines. Storage capacitor lines also extend along the signal lines. Storage capacitors are defined between the semiconductor layers and the storage capacitor lines. The storage capacitor lines divide the pixel electrodes into first and second regions, respectively. The first and regions are overlapped at least in part with the signal lines. Contacts between the semiconductor layers and the pixel electrodes are disposed apart from the gate electrodes.
115 Citations
15 Claims
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1. A liquid crystal display device comprising:
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an array substrate; a counter substrate provided opposite to said array substrate, said counter substrate having counter electrodes; a liquid crystal contained between said array and counter substrates; scanning lines provided on said array substrate; signal lines running across said scanning lines through an insulator; switching elements including thin film transistors provided in a matrix form at crossing areas where said scanning lines run across said scanning lines; pixel electrodes provided in a matrix form in regions surrounded by said scanning and signal lines, said pixel electrodes being connected to said switching elements; and storage capacitor lines disposed in parallel with said scanning lines; wherein said storage capacitor lines divide said pixel electrodes into first regions and second regions and define storage capacitors overlapping with and extending along said signal lines, wherein each of said thin film transistors includes a semiconductor layer which is overlapped with and extended along said crossing area, an area adjacent thereto and said storage capacitor, wherein an end portion of said semiconductor layer is overlapped with said first region of said pixel electrode, wherein said semiconductor forms a channel at said crossing area, and includes a first contact portion between said signal line and one of said source and drain electrodes at a location in the vicinity of said channel, and a second contact portion between said first region and the other one of said source and drain electrodes at said end portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A liquid crystal display device comprising:
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an array substrate; a counter substrate provided opposite to said array substrate, said counter substrate having counter electrodes; a liquid crystal contained between said array and counter substrates; scanning lines provided on said array substrate; signal lines running across said scanning lines through an insulator; switching elements including thin film transistors provided in a matrix form at crossing areas where said scanning lines run across said scanning lines; pixel electrodes provided in a matrix form in regions surround by said scanning and signal lines, said pixel electrodes being connected to said switching elements; storage capacitor lines disposed in parallel with said scanning lines; a spacer provided on said array substrate to hold gaps between said array and counter substrates; and alignment layers provided on surfaces of said array and said counter substrates, said surfaces contacting said liquid crystal; wherein said storage capacitor lines divide said pixel electrodes into first regions and second regions and define storage capacitors overlapping with and extending along said signal lines, wherein each of said thin film transistors includes a semiconductor layer which is overlapped with and extended along said crossing area, an area adjacent thereto and said storage capacitor, wherein an end portion of said semiconductor layer is overlapped with said first region of said pixel electrode, wherein said semiconductor forms a channel at said crossing area, and includes a first contact portion between said signal line and one of said source and drain electrodes at a location in the vicinity of the channel, and a second contact portion between said first region and the other one of said source and drain electrodes at said end portion, wherein said spacer is formed in a column configuration which cross-section is substantially narrow, and wherein said spacer is disposed at a location on said signal line adjacent to said first region of said pixel electrode. - View Dependent Claims (12, 13, 14, 15)
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Specification
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Current AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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InventorsNakamura, Hiroki, Kihara, Yumi
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Primary Examiner(s)Parker, Kenneth
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Application NumberUS08/936,818Time in Patent Office783 DaysField of Search349/38, 349/39, 349/43, 349/111, 349/140, 257/59, 257/72US Class Current349/39CPC Class CodesG02F 1/136213 Storage capacitors associat...G02F 1/1368 in which the switching elem...
