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| Method of and apparatus for the storage of radioactive waste |
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| Fabrication of leads on semiconductor connection components |
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| Semiconductor connection components and methods with releasable lead support |
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Electro-optical device constructed with thin film transistors
| Details |
Inventors: Yamazaki, Shunpei;
Assignee: Semiconductor Energy Laboratory Co., Ltd. (Kanagawa, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Mai; Huy
Attorney, Agent or Firm: Sixbey, Friedman, Leedom & Ferguson, Ferguson, Jr.; Gerald J., Smith; Evan R.
An electro-optical device and a method for manufacturing the same are disclosed. The device comprises a pair of substrates and an electro-optical modulating layer (e.g. a liquid crystal layer having sandwiched therebetween, said pair of substrates consisting of a first substrate having provided thereon a plurality of gate wires, a plurality of source (drain) wires, and a pixel matrix comprising thin film transistors, and a second substrate facing the first substrate, wherein, among the peripheral circuits having established on the first substrate and being connected to the matrix wirings for the X direction and the Y direction, only a part of said peripheral circuits is constructed from thin film semiconductor devices fabricated by the same process utilized for an active device, and the rest of the peripheral circuits is constructed from semiconductor chips. The liquid crystal display device according to the present invention is characterized by that the peripheral circuits are not wholly fabricated into thin film transistors, but only those portions having a simple device structure, or those composed of a small number of devices, or those comprising an IC not easily available commercially, or those comprising an expensive integrated circuit, are fabricated by thin film transistors. According to the present invention, an electro-optical device is provided at an increased production yield with a reduced production cost. |
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DETAILED DESCRIPTION An object of the present invention is to overcome the six problems mentioned above by taking balance among them and to provide a more economical electro-optical device at a high yield.
This and other objects of the present invention have been attained by an electro-optical device comprising a pair of substrates and an electro-optical modulating layer having sandwiched therebetween, said pair of substrates consisting of a first substrate having provided thereon thin film transistors and matrix lines comprising a plurality of gate wires (extending e.
g.
in Y direction) and a plurality of source (drain) wires (extending e.
g.
in X direction), and a second substrate facing the first substrate, wherein, among the peripheral circuits being connected to the matrix lines, only one direction side of said peripheral circuits is constructed from thin film semiconductor devices fabricated by the same process utilized for the thin film transistors, and the rest of the peripheral circuits is constructed from semiconductor chips.
The electro-optical modulating layer may comprise a liquid crystal.
In the electro-optical device according to the present invention, the peripheral circuit only on one side is fabricated as TFTs.
In such a manner, a general use economical ICs can be utilized on one side, while fabricating the side comprising peripheral circuits which are not commercially available or which are costly, as TFTs.
Furthermore, by making only one side into TFTs, the number of the TFTs in the peripheral circuit portion can be considerably reduced.
For example, the number of the TFTs can be halved in case the peripheral circuits for the X and the Y directions have the same function.
Thus, the production yield of a TFT on the same substrate is increased by two times in a simple calculation.
According to another embodiment of the present invention, there is provided an electro-optical device comprising a first substrate having provided thereon a pixel matrix furnished with complementary TFTs and matrix lines comprising a plurality of gate wires (extending e
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Quantum Computing 
