Light-emitting device having triplet and singlet compound in light-emitting layers
First Claim
Patent Images
1. A display comprising:
- a display portion having a light emitting device, the light emitting device comprising a pixel portion, the pixel portion comprising;
a first pixel including a first EL element for emitting a red light;
a second pixel including a second EL element for emitting a green light; and
a third pixel including a third EL element for emitting a blue light,wherein each of the first, second and third pixels comprises a switching thin film transistor and a current control thin film transistor; and
wherein a triplet compound is used in the first EL element while a singlet compound is used in each of the second and third EL elements.
0 Assignments
0 Petitions
Accused Products
Abstract
There is provided a light emitting device which enables a color display with good color balance. A triplet compound is used for a light emitting layer of an EL element that emits red color, and a singlet compound is used for a light emitting layer of an EL element that emits green color and a light emitting layer of an EL element that emits blue color. Thus, an operation voltage of the EL element emitting red color may be made the same as the EL element emitting green color and the EL element emitting blue color. Accordingly, the color display with good color balance can be realized.
105 Citations
80 Claims
-
1. A display comprising:
-
a display portion having a light emitting device, the light emitting device comprising a pixel portion, the pixel portion comprising; a first pixel including a first EL element for emitting a red light; a second pixel including a second EL element for emitting a green light; and a third pixel including a third EL element for emitting a blue light, wherein each of the first, second and third pixels comprises a switching thin film transistor and a current control thin film transistor; and wherein a triplet compound is used in the first EL element while a singlet compound is used in each of the second and third EL elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A portable telephone comprising:
-
a display portion having a light emitting element; a sound input portion; and a sound output portion, the light emitting device comprising a pixel portion, the pixel portion comprising; a first pixel including a first EL element for emitting a red light; a second pixel including a second EL element for emitting a green light; and a third pixel including a third EL element for emitting a blue light, wherein each of the first, second and third pixels comprises a switching thin film transistor and a current control thin film transistor; and wherein a triplet compound is used in the first EL element while a singlet compound is used in each of the second and third EL elements. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A display comprising:
-
a display portion having a light emitting device, the light emitting device comprising a pixel portion, the pixel portion comprising; a first pixel including a first EL element for emitting a red light; a second pixel including a second EL element for emitting a green light; and a third pixel including a third EL element for emitting a blue light, wherein each of the first, second and third pixels comprises a switching thin film transistor and a current control thin film transistor; wherein the first EL element comprises a triplet compound; and wherein at least one of the second EL element and the third EL element comprises a singlet compound. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. A portable telephone comprising:
-
a display portion having a light emitting element; a sound input portion; and a sound output portion, the light emitting device comprising a pixel portion, the pixel portion comprising; a first pixel including a first EL element for emitting a red light; a second pixel including a second EL element for emitting a green light; and a third pixel including a third EL element for emitting a blue light, wherein each of the first, second and third pixels comprises a switching thin film transistor and a current control thin film transistor; wherein the first EL element comprises a triplet compound; and wherein at least one of the second EL element and the third EL element comprises a singlet compound. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
-
-
49. A portable telephone comprising:
-
a display portion having a light emitting element; a sound input portion; and a sound output portion, the light emitting device comprising a pixel portion, the pixel portion comprising; a first EL element for emitting a red light; a second EL element for emitting a green light; and a third EL element for emitting a blue light, wherein the first EL element comprises a triplet compound; and wherein at least one of the second EL element and the third EL element comprises a singlet compound. - View Dependent Claims (50, 51, 52, 53, 54)
-
-
55. A portable telephone comprising:
-
a display portion having a light emitting element; a sound input portion; and a sound output portion, the light emitting device comprising a pixel portion, the pixel portion comprising; a first EL element for emitting a red light; a second EL element for emitting a green light; and a third EL element for emitting a blue light, wherein the first EL element comprises a first electrode, a second electrode and a light emitting layer comprising an organic compound which emits light by a triplet excitation interposed therebetween; and wherein at least one of the second EL element and the third EL element comprises a third electrode, a fourth electrode and a light emitting layer comprising an organic compound which emits light by a singlet excitation interposed therebetween. - View Dependent Claims (56, 57, 58, 59, 60)
-
-
61. A light emitting device having a pixel portion, the pixel portion comprising:
-
a first pixel electrode, a second pixel electrode, and a third pixel electrode; a hole injection layer being in contact with each of the first pixel electrode, the second pixel electrode, and the third pixel electrode; a first light emitting layer formed over the first pixel electrode with the hole injection layer interposed therebetween, wherein the first light emitting layer emits red light and comprises a triplet compound; a second light emitting layer formed over the second pixel electrode with the hole injection layer interposed therebetween, wherein the second light emitting layer emits green light; and a third light emitting layer formed over the third pixel electrode with the hole injection layer interposed therebetween, wherein the third light emitting layer emits blue light, wherein at least one of the second light emitting layer and the third light emitting layer comprises a singlet compound. - View Dependent Claims (62, 63, 64, 65)
-
-
66. A light emitting device having a pixel portion, the pixel portion comprising:
-
a first thin film transistor, a second thin film transistor, and a third thin film transistor; a first pixel electrode electrically connected to the first thin film transistor, a second pixel electrode electrically connected to the second thin film transistor, and a third pixel electrode electrically connected to the third thin film transistor; a hole injection layer being in contact with each of the first pixel electrode, the second pixel electrode, and the third pixel electrode; a first light emitting layer formed over the first pixel electrode with the hole injection layer interposed therebetween, wherein the first light emitting layer emits red light and comprises a triplet compound; a second light emitting layer formed over the second pixel electrode with the hole injection layer interposed therebetween, wherein the second light emitting layer emits green light; and a third light emitting layer formed over the third pixel electrode with the hole injection layer interposed therebetween, wherein the third light emitting layer emits blue light, wherein at least one of the second light emitting layer and the third light emitting layer comprises a singlet compound. - View Dependent Claims (67, 68, 69, 70)
-
-
71. A light emitting device having a pixel portion, the pixel portion comprising:
-
a first thin film transistor, a second thin film transistor, and a third thin film transistor; a first pixel electrode electrically connected to the first thin film transistor, a second pixel electrode electrically connected to the second thin film transistor, and a third pixel electrode electrically connected to the third thin film transistor; a fourth electrode over the first pixel electrode, the second pixel electrode, and the third pixel electrode; a first light emitting layer interposed between the first pixel electrode and the fourth electrode, wherein the first light emitting layer emits red light and comprises a triplet compound; a second light emitting layer interposed between the second pixel electrode and the fourth electrode, wherein the second light emitting layer emits green light light;
a third light emitting layer interposed between the third pixel electrode and the fourth electrode, wherein the third light emitting layer emits blue light; andan electron injecting layer interposed between the fourth electrode and each of the first light emitting layer, the second light emitting layer, and the third light emitting layer, wherein at least one of the second light emitting layer and the third light emitting layer comprises a singlet compound. - View Dependent Claims (72, 73, 74, 75)
-
-
76. A light emitting device having a pixel portion, the pixel portion comprising:
-
a first thin film transistor, a second thin film transistor, and a third thin film transistor; a first pixel electrode electrically connected to the first thin film transistor, a second pixel electrode electrically connected to the second thin film transistor, and a third pixel electrode electrically connected to the third thin film transistor; a fourth electrode over the first pixel electrode, the second pixel electrode, and the third pixel electrode; a hole injection layer being in contact with each of the first pixel electrode, the second pixel electrode, and the third pixel electrode; a first light emitting layer interposed between the hole injection layer and the fourth electrode, wherein the first light emitting layer emits red light and comprises a triplet compound; a second light emitting layer interposed between the hole injection layer and the fourth electrode, wherein the second light emitting layer emits green light light; a third light emitting layer interposed between the hole injection layer and the fourth electrode, wherein the third light emitting layer emits blue light; and an electron injecting layer interposed between the fourth electrode and each of the first light emitting layer, the second light emitting layer, and the third light emitting layer comprises a singlet compound. - View Dependent Claims (77, 78, 79, 80)
-
Specification