Light emitting device
First Claim
Patent Images
1. A light emitting device comprising:
- a substrate;
a first EL element over the substrate; and
a second EL element over the substrate, wherein the first EL element comprises a first EL layer comprising a triplet compound, wherein the second EL element comprises a second EL layer comprising a singlet compound, and wherein at least one of the first and second EL layers comprises a plurality of hole transporting layers.
1 Assignment
0 Petitions
Accused Products
Abstract
The luminance of different colors of light emitted from EL elements in a pixel portion of a light emitting device is equalized and the luminance of light emitted from the EL elements is raised. The pixel portion of the light emitting device has EL elements whose EL layers contain triplet compounds and EL elements whose EL layers contain singlet compounds in combination. The luminance of light emitted from the plural EL elements is thus equalized. Furthermore, a hole transporting layer has a laminate structure to thereby cause the EL elements to emit light of higher luminance.
-
Citations
17 Claims
-
1. A light emitting device comprising:
-
a substrate;
a first EL element over the substrate; and
a second EL element over the substrate, wherein the first EL element comprises a first EL layer comprising a triplet compound, wherein the second EL element comprises a second EL layer comprising a singlet compound, and wherein at least one of the first and second EL layers comprises a plurality of hole transporting layers. - View Dependent Claims (2, 3, 4)
-
-
5. A light emitting device comprising:
-
a first substrate;
a second substrate;
a flexible printed circuit;
a pixel portion including a first thin film transistor over the first substrate;
a driver circuit including a second thin film transistor over the second substrate;
wherein the pixel portion comprises a first EL element and a second EL element, wherein the first EL element comprises a first EL layer comprising a triplet compound, wherein the second EL element comprises a second EL layer comprising a singlet compound, wherein at least one of the first and second EL layers comprises a plurality of hole transporting layers, and wherein the first substrate and the second substrate are connected through the flexible printed circuit. - View Dependent Claims (6, 7, 8)
-
-
9. A light emitting device comprising:
-
a substrate;
a pixel portion including a first thin film transistor over the substrate;
a driver circuit including a second thin film transistor over the substrate;
wherein the pixel portion comprises a first EL element and a second EL element, wherein the first EL element comprises a first EL layer comprising a triplet compound, wherein the second EL element comprises a second EL layer comprising a singlet compound, and wherein at least one of the first and second EL layers comprises a plurality of hole transporting layers. - View Dependent Claims (10, 11, 12)
-
-
13. An image playback device comprising:
-
a main body;
a display portion;
an operation switch;
a substrate;
a first EL element over the substrate; and
a second EL element over the substrate, wherein the first EL element comprises a first EL layer comprising a triplet compound, wherein the second EL element comprises a second EL layer comprising a singlet compound, and wherein at least one of the first and second EL layers comprises a plurality of hole transporting layers. - View Dependent Claims (14, 15, 16, 17)
-
Specification