Display device and method of fabricating the display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Hideomi Suzawa, Ichiro Uehara
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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.
Claims40
A display device comprising:
- a first electrode on an insulating surface over a substrate;
- a power supply line over the substrate;
- an electroluminescence film on the first electrode;
- a second electrode on the electroluminescence film;
- and
- a bump selectively formed for covering an end portion of the first electrode,
- 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 an upper surface of the bump,
- wherein a surface of the bottom end portion is rounded, and a surface of the top end portion is rounded, and
- wherein the power supply line extends along and below a portion of the bump.
A display device comprising:
- a first electrode on an insulating surface over a substrate;
- a data wiring over the substrate;
- an electroluminescence film on the first electrode;
- a second electrode on the electroluminescence film;
- and
- a bump selectively formed for covering an end portion of the first electrode,
- 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 an upper surface of the bump,
- wherein a surface of the bottom end portion is rounded, and a surface of the top end portion is rounded, and
- wherein the data wiring extends along and below a portion of the bump.
A display device comprising:
- a first electrode on an insulating surface over a substrate;
- a power supply line over the substrate;
- an electroluminescence film on the first electrode;
- a second electrode on the electroluminescence film;
- and
- a bump selectively formed for covering an end portion of the first electrode,
- 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 an upper surface of the bump,
- wherein the bottom end portion has a curved surface having a first radius of curvature and a center of curvature located above the first electrode, and the top end portion has a curved surface having a second radius of curvature and a center of curvature located inside the bump, and
- wherein the power supply line extends along and below a portion of the bump.
A display device comprising:
- a first electrode on an insulating surface over a substrate;
- a data wiring over the substrate;
- an electroluminescence film on the first electrode;
- a second electrode on the electroluminescence film;
- and
- a bump selectively formed for covering an end portion of the first electrode,
- 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 an upper surface of the bump,
- wherein the bottom end portion has a curved surface having a first radius of curvature and a center of curvature located above the first electrode, and the top end portion has a curved surface having a second radius of curvature and a center of curvature located inside the bump, and
- wherein the data wiring extends along and below a portion of the bump.
Dependencies are inferred from the claim text.