Active-matrix liquid crystal display having storage capacitors of area smaller than that of pixel electrodes
First Claim
1. An active-matrix liquid crystal display comprising:
- a transparent upper substrate;
a transparent lower substrate disposed opposite to the upper substrate;
a liquid crystal filled and sealed in a space between the upper and the lower substrate;
a plurality of parallel gate lines formed on the lower substrate;
a plurality of parallel source lines formed on the lower substrate so as to extend perpendicularly to the gate lines;
thin-film transistors formed at intersections of the gate lines and the source lines, respectively;
pixel electrodes connected to the thin-film transistors, respectively; and
storage capacitors connected to the pixel electrodes, respectively;
wherein separate films are used as an insulating film included in the storage capacitors and a gate insulating film included in the thin-film transistors, respectively, and each of the storage capacitors has an upper electrode connected to the pixel electrode and a lower electrode disposed opposite to the upper electrode with the insulating film sandwiched between the upper and the lower electrode.
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Accused Products
Abstract
An active-matrix liquid crystal display has storage capacitors each having a small area relative to the area of each of pixel electrodes and has a large aperture ratio. A plurality of gate lines are formed on a lower substrate and a plurality of source lines are formed on the lower substrate so as to extend perpendicularly to the gate lines. Thin-film transistors are formed near the intersections of the gate lines and the source lines. Pixel electrodes are connected to the thin-film transistors and storage capacitors. Each storage capacitor includes an upper electrode, a lower electrode disposed opposite to the upper electrode, and an insulating film sandwiched between the upper and the lower electrode. The insulating film for the storage capacitors and gate insulating film for the thin-film transistors are formed separately. The insulating film for the storage capacitors is formed of a material different from that of the gate insulating film in a thickness smaller than that of the gate insulating film so that the storage capacitors have a large capacitance per unit area.
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Citations
22 Claims
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1. An active-matrix liquid crystal display comprising:
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a transparent upper substrate;
a transparent lower substrate disposed opposite to the upper substrate;
a liquid crystal filled and sealed in a space between the upper and the lower substrate;
a plurality of parallel gate lines formed on the lower substrate;
a plurality of parallel source lines formed on the lower substrate so as to extend perpendicularly to the gate lines;
thin-film transistors formed at intersections of the gate lines and the source lines, respectively;
pixel electrodes connected to the thin-film transistors, respectively; and
storage capacitors connected to the pixel electrodes, respectively;
wherein separate films are used as an insulating film included in the storage capacitors and a gate insulating film included in the thin-film transistors, respectively, and each of the storage capacitors has an upper electrode connected to the pixel electrode and a lower electrode disposed opposite to the upper electrode with the insulating film sandwiched between the upper and the lower electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An active-matrix liquid crystal display comprising:
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a transparent upper substrate;
a transparent lower substrate disposed opposite to the upper substrate;
a liquid crystal filled and sealed in a space between the upper and the lower substrate;
a plurality of parallel gate lines formed on the lower substrate;
a plurality of parallel source lines formed on the lower substrate so as to extend perpendicularly to the gate lines;
thin-film transistors formed at intersections of the gate lines and the source lines, respectively, and having a gate insulating film;
pixel electrodes connected to the thin-film transistors, respectively;
lower electrodes disposed below the pixel electrode;
auxiliary electrodes disposed between the lower electrodes and the pixel electrodes; and
a separate insulating film disposed between the auxiliary electrodes and the pixel electrodes;
the insulating film, pixel electrodes, auxiliary electrodes, and lower electrodes forming a storage capacitor.- View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification