EL display device, driving method thereof, and electronic equipment provided with the EL display device
First Claim
Patent Images
1. A light emitting element comprising:
- an electrode formed of a conductive film over a substrate;
a transparent pixel electrode over and in contact with the electrode;
an insulating film over the transparent pixel electrode, the insulating film overlapping a part of the transparent pixel electrode;
an electroluminescent layer over the transparent pixel electrode and the insulating film; and
a cathode over the electroluminescent layer.
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Abstract
An EL display device capable of performing clear multi-gradation color display and electronic equipment provided with the EL display device are provided, wherein gradation display is performed according to a time-division driving method in which the luminescence and non-luminescence of an EL element (109) disposed in a pixel (104) are controlled by time, and the influence by the characteristic variability of a current controlling TFT (108) is prevented. When this method is used, a data signal side driving circuit (102) and a gate signal side driving circuit (103) are formed with TFTs that use a silicon film having a peculiar crystal structure and exhibit an extremely high operation speed.
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Citations
27 Claims
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1. A light emitting element comprising:
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an electrode formed of a conductive film over a substrate; a transparent pixel electrode over and in contact with the electrode; an insulating film over the transparent pixel electrode, the insulating film overlapping a part of the transparent pixel electrode; an electroluminescent layer over the transparent pixel electrode and the insulating film; and a cathode over the electroluminescent layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A light emitting device comprising:
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a pixel portion formed over a substrate; plural pixels formed in the pixel portion; a switching thin film transistor and a current-control thin film transistor formed in at least one of the plural pixels; an electrode formed of a conductive film which is electrically connected to the current-control thin film transistor; a transparent pixel electrode over and in contact with the electrode; an insulating film over the transparent pixel electrode, the insulating film overlapping a part of the transparent pixel electrode; an electroluminescent layer over and in contact with the transparent pixel electrode and the insulating film; and a cathode over the electroluminescent layer, wherein the conductive film comprises aluminum. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An electronic equipment comprising an electroluminescent element, the electroluminescent element comprising;
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an electrode formed of a conductive film over a substrate; a transparent pixel electrode over and in contact with the electrode; an insulating film over the transparent pixel electrode, the insulating film overlapping a part of the transparent pixel electrode; an electroluminescent layer over the transparent pixel electrode and the insulating film; and a cathode over the electroluminescent layer, wherein the conductive film comprises aluminum. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification