Light emitting device
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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.
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Citations
71 Claims
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1-47. -47. (canceled)
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48. A display comprising:
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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 (49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A portable telephone comprising:
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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 (61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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Specification