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Active matrix LCD device with image signal lines having a multilayered structure
| Details |
Inventors: Ono, Kikuo; Ogawa, Kazuhiro; Suzuki, Takashi; Anno, Kouichi; Sakuta, Hiroki; Tsumura, Makoto; Kitajima, Masaaki; Kawachi, Genshiro;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Ton; Toan
Attorney, Agent or Firm: Antonelli, Terry, Stout, & Kraus, LLP
A liquid crystal display device and a manufacturing method therefor are provided where the number of processes for manufacturing TFT substrates can be decreased and a high production yield can be attained. To attain these objects, an image signal bus-line includes at least a transparent conductive film and a semiconductor layer. A pattern of the transparent conductive film extends up to a thin film transistor to form its drain electrode, and a pattern of a semiconductor layer extends up to the transistor to form its source electrode. By virtue of these arrangements, the thin film transistor substrate can be manufactured using as little as three or four photolithography processes. |
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DETAILED DESCRIPTION The first object of the present invention is to provide a liquid-crystal display device and a manufacturing method therefor where the number of processes for manufacturing TFT substrates can be deceased and high production yield can be attained.
The second object of the present invention is to provide a liquid-crystal display device of active matrix type which is improved to solve the aforementioned problems accompanying the use of capacitor elements.
Describing this in more detail, the second object of the present invention is to provide a liquid-crystal display device of active matrix driving type which is high in aperture ratio, high in production yield, large in screen size and high in resolution, and further excellent in display quality.
Other objects of the present invention will appear in the course of the description of embodiments which follows.
In order to attain the first object above, a liquid crystal display device comprises one substrate having on one side of the surfaces a plurality of scanning signal bus-lines extending in a first direction, a plurality of image signal bus-lines extending in a second direction intersecting with the scanning signal bus-lines and insulated from the scanning signal bus-lines, pixel electrodes placed in areas surrounded by the adjacent scanning signal bus-lines and the adjacent image signal bus-lines apart from both of the signal bus-lines, thin film transistors placed near the intersecting points of the scanning signal bus-lines and the image signal bus-lines, their gate electrodes being connected to the scanning bus-lines, their drain electrodes being connected to the image signal bus-lines, and their source electrodes being connected to the pixel electrodes, another substrate having common electrodes on one side of the surfaces facing against the one substrate, and a liquid-crystal layer interposed between the one substrate and the other substrate, wherein the image signal bus-line is formed of a transparent conductive film, extending up to the thin film transistor to form the drain electrode, and the pixel electrode being formed of a transparent conductive film, extending up to the thin film transistor to form the source electrode
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