Display device and method of fabricating the display device
First Claim
1. A light emitting device comprising:
- a thin film transistor over a substrate;
an interlayer insulating film over the thin film transistor;
a first electrode on the interlayer insulating film;
a bump selectively formed for covering an end portion of the first-electrode;
an electroluminescence film on the first electrode; and
a second electrode on the electroluminescence film;
wherein the bump has a bottom end portion contacting with an upper surface of the first electrode and a top end portion connecting continuously to a flat upper surface of the bump,wherein the top end portion of the bump is rounded, andwherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween.
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Accused Products
Abstract
In an EL element having an anode, an insulating film (bump) formed on the anode, and an EL film and a cathode formed on the insulating film, each of a bottom end portion and a top end portion of the insulating film is formed so as to have a curved surface. The taper angle of a central portion of the insulating film is set within the range from 35° to 70°, thereby preventing the gradient of the film forming surface on which the EL film and the cathode are to be formed from being abruptly changed. On the thus-formed film forming surface, the EL film and the cathode can be formed so as to be uniform in thickness, so that occurrence of discontinuity in each of EL film and the cathode is prevented.
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Citations
60 Claims
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1. A light emitting device comprising:
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a thin film transistor over a substrate; an interlayer insulating film over the thin film transistor; a first electrode on the interlayer insulating film; a bump selectively formed for covering an end portion of the first-electrode; an electroluminescence film on the first electrode; and a second electrode on the electroluminescence film; wherein the bump has a bottom end portion contacting with an upper surface of the first electrode and a top end portion connecting continuously to a flat upper surface of the bump, wherein the top end portion of the bump is rounded, and wherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A display device comprising:
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a thin film transistor over a substrate; an interlayer insulating film over the thin film transistor; a first electrode on the interlayer insulating surface; a bump selectively formed for covering an end portion of the first electrode; an electroluminescence film on the first electrode; and a second electrode on the electroluminescence film, wherein the bump has a bottom end portion contacting with an upper surface of the electrode, a top end portion connecting continuously to a flat upper surface of the bump, and a central portion between the bottom end portion and the top end portion, wherein the top end portion of the bump is rounded, wherein a tangent of the central portion has a taper angle of 35°
to 70°
with respect to the upper surface of the first electrode, andwherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A light emitting device comprising:
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a thin film transistor over a substrate; an interlayer insulating film over the thin film transistor; a first electrode on an interlayer insulating surface; a bump selectively formed for covering an end portion of the first electrode; an electroluminescence film on the first electrode; and a second electrode on the electroluminescence film; wherein the bump has a bottom end portion contacting with an upper surface of the first electrode and a top end portion connecting continuously to a flat upper surface of the bump, wherein the top end portion the bump has a curved surface having a first radius of a curvature and a center of curvature located inside the bump, and wherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A light emitting device comprising:
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a thin film transistor over a substrate; an interlayer insulating film over the thin film transistor; a first electrode on the interlayer insulating film; a bump selectively formed for covering an end portion of the first electrode; an electroluminescence film on the first electrode; and a second electrode on the electroluminescence film, wherein the bump has a bottom end portion contacting with an upper surface of the first electrode, a top end portion connecting continuously to a flat upper surface of the bump, and a central portion between the bottom end portion and the top end portion, wherein the top end portion has a curved surface having a first radius of a curvature and a center of curvature located inside the bump, wherein a tangent of the central portion has a taper angle of 35°
to 70°
with respect to the upper surface of the first electrode, andwherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A light emitting device comprising:
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a thin film transistor over a substrate; an interlayer insulating film over the thin film transistor; a first electrode on the interlayer insulating film; a bump selectively formed for covering an end portion of the first electrode; an electroluminescence film on the first electrode; and a second electrode on the electroluminescence film; wherein the bump has a bottom end portion contacting with an upper surface of the first electrode and a top end portion connecting continuously to a flat upper surface of the bump, wherein an angle between a tangent of the bump and the upper surface of the first electrode changes continuously from the bottom end portion to the top end portion, the angle being within 0°
to 70°
, andwherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
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51. A light emitting device comprising:
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a thin film transistor over a substrate; an interlayer insulating film over the thin film transistor; a first electrode on the interlayer insulating film; a bump selectively formed for covering an end portion of the first electrode, an electroluminescence film on the first electrode; and a second electrode on the electroluminescence film; wherein the bump has a bottom end portion contacting with an upper surface of the first electrode and a top end portion connecting continuously to a flat upper surface of the bump, wherein the top end portion has an elliptic or circular surface having a center located inside the bump, and wherein the thin film transistor is overlapped with the bump with at least the interlayer insulating film interposed therebetween. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60)
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Specification