Electro-optical device and method for driving the same
First Claim
1. A method for forming an electro-optical device comprising the steps of:
- forming a plurality of thin film transistors, each of said thin film transistors having at least a semiconductor film to form a channel region;
forming an interlayer insulating film comprising an inorganic material on the thin film transistors;
forming a leveling layer comprising an organic resin over said interlayer insulating film to provide a leveled upper surface;
forming a plurality of openings in the leveling layer over the respective thin film transistors; and
forming a plurality of pixel electrodes over the leveled upper surface, each of said pixel electrodes being electrically connected to the corresponding thin film transistors through the corresponding openings,wherein an inside wall of at least some of said openings is tapered.
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Reexamination
Accused Products
Abstract
A novel structure of an active electro-optical device is disclosed. The device is provided with complementary thin film insulated gate field effect transistors (TFTs) therein which comprise a P-TFT and an N-TFT, P-TFT and N-TFT are connected to a common signal line by the gate electrodes thereof, while the source (or drain) electrodes thereof are connected to a common signal line as well as to one of the picture element electrodes.
In case of driving the active electro-optical device, a gradation display can be carried out in a driving method having a display timing determined in relation to a time F for writing one screen and a time (t) for writing in one picture element, by applying a reference signal in a cycle of the time (t), to the signal line used for a certain picture element driving selection, and by applying the select signal to the other signal line at a certain timing within the time (t), and whereby setting the value of the voltage to be applied to a liquid crystal.
191 Citations
40 Claims
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1. A method for forming an electro-optical device comprising the steps of:
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forming a plurality of thin film transistors, each of said thin film transistors having at least a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistors; forming a leveling layer comprising an organic resin over said interlayer insulating film to provide a leveled upper surface; forming a plurality of openings in the leveling layer over the respective thin film transistors; and forming a plurality of pixel electrodes over the leveled upper surface, each of said pixel electrodes being electrically connected to the corresponding thin film transistors through the corresponding openings, wherein an inside wall of at least some of said openings is tapered. - View Dependent Claims (2, 3, 4, 5, 38, 39, 40)
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6. A method for forming an electro-optical device comprising the steps of:
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forming a thin film transistor, said thin film transistor having a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistor; forming a leveling layer comprising an organic resin over said thin film transistor to provide a leveled upper surface; forming an opening in said leveling layer over said thin film transistor; and forming a pixel electrode over the leveled upper surface, said pixel electrode being electrically connected to said thin film transistor through said opening, wherein a diameter of said opening is larger at an uppermost surface of said organic resin layer than at a lowermost surface thereof. - View Dependent Claims (7, 8, 9, 10)
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11. A method for forming an electro-optical device comprising the steps of:
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forming a plurality of thin film transistors on an insulating surface, each of said thin film transistors having at least a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistors; forming a leveling layer comprising an organic resin over said interlayer insulating film to provide a leveled upper surface; forming a plurality of openings in the leveling layer over the respective thin film transistors; forming a plurality of pixel electrodes over the leveled upper surface, each of said pixel electrodes being electrically connected to the corresponding thin film transistors through the corresponding openings, wherein the respective diameters of at least some of said openings is are larger at an uppermost surface of the leveling layer than at a lowermost surface thereof. - View Dependent Claims (12, 13, 14)
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15. A method for forming an electro-optical device comprising the steps of:
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forming a thin film transistor on an insulating surface, said thin film transistor having a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistors; forming a leveling layer comprising an organic resin over said interlayer insulating film to provide a leveled upper surface; forming an opening in said leveling layer over said thin film transistor; forming a pixel electrode over said leveled upper surface, said pixel electrode being electrically connected to said thin film transistor through said opening, wherein said opening has a tapered configuration. - View Dependent Claims (16, 17, 18)
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19. A method for forming an electro-optical device comprising the steps of:
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forming a plurality of thin film transistors on an insulating surface, each of said thin film transistors having at least a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistors; forming first openings in the interlayer insulating film on the respective transistors; forming a leveling layer comprising an organic resin on said interlayer insulating film to provide a leveled upper surface; forming second openings in said leveling layer over the respective transistors; and forming pixel electrodes on the leveled upper surface, each of said pixel electrode being connected to the corresponding transistors through the corresponding first and second openings, wherein an inside wall of each of said second openings is tapered. - View Dependent Claims (20, 21, 22, 23)
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24. A method for forming an electro-optical device comprising the steps of:
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forming a thin film transistor on an insulating surface, said transistor having a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material above the thin film transistor; forming a leveling layer comprising an organic resin over said transistor to provide a leveled upper surface, wherein said interlayer insulating film prevents said leveling film from directly contacting said semiconductor film; forming an opening in said leveling layer; and forming a pixel electrode on said leveled upper surface, said pixel electrode being electrically connected to said transistor through said opening, wherein a diameter of said opening is larger at an uppermost surface of said organic resin layer than at a lowermost surface thereof. - View Dependent Claims (25, 26, 27, 28)
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29. A method for forming an electro-optical device comprising the steps of:
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forming a plurality of thin film transistors on an insulating surface, each of said thin film transistors having at least a semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistors; forming a leveling layer comprising an organic resin over said interlayer insulating film to provide a leveled upper surface; forming a plurality of openings in said leveling layer over the respective thin film transistors; and forming a plurality of pixel electrodes over said leveled upper surface, each of said pixel electrodes being electrically connected to the corresponding thin film transistors through the corresponding openings, wherein an inside wall of at least some of said openings is tapered, and wherein said organic resin is translucent. - View Dependent Claims (30, 31, 32)
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33. A method for forming an electro-optical device comprising the steps of:
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forming a thin film transistor on an insulating surface, said thin film transistor having semiconductor film to form a channel region; forming an interlayer insulating film comprising an inorganic material on the thin film transistor; forming a leveling layer comprising an organic resin over the interlayer insulating film to provide a leveled upper surface; forming an opening in the leveling layer over said thin film transistor; and forming a pixel electrode over the leveled upper surface, said pixel electrode being electrically connected to said thin film transistor through said opening, wherein a diameter of said opening is larger at an uppermost surface of said organic resin layer than at a lowermost surface thereof, and wherein said organic resin is translucent. - View Dependent Claims (34, 35, 36, 37)
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Specification