Light emitting device
First Claim
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1. A light emitting device comprising:
- a pixel portion;
a switching thin film transistor in the pixel portion;
a current control thin film transistor in the pixel portion;
at least an EL element electrically connected to the current control thin film transistor in the pixel portion;
wherein the switching thin film transistor is an n-channel thin film transistor;
wherein the current control thin film transistor is a p-channel thin film transistor;
a first pixel including a first EL element for emitting a red light in the pixel portion;
a second pixel including a second EL element for emitting a green light in the pixel portion;
a third pixel including a third EL element for emitting a blue light in the pixel portion;
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.
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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
52 Claims
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1. A light emitting device comprising:
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a pixel portion;
a switching thin film transistor in the pixel portion;
a current control thin film transistor in the pixel portion;
at least an EL element electrically connected to the current control thin film transistor in the pixel portion;
wherein the switching thin film transistor is an n-channel thin film transistor;
wherein the current control thin film transistor is a p-channel thin film transistor;
a first pixel including a first EL element for emitting a red light in the pixel portion;
a second pixel including a second EL element for emitting a green light in the pixel portion;
a third pixel including a third EL element for emitting a blue light in the pixel portion;
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 (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 19)
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2. A light emitting device comprising:
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a pixel portion;
a switching thin film transistor in the pixel portion;
a current control thin film transistor in the pixel portion;
at least an EL element electrically connected to the current control thin film transistor in the pixel portion;
wherein the switching thin film transistor is a p-channel thin film transistor;
wherein the current control thin film transistor is an n-channel thin film transistor;
a first pixel including a first EL element for emitting a red light in the pixel portion;
a second pixel including a second EL element for emitting a green light in the pixel portion;
a third pixel including a third EL element for emitting a blue light in the pixel portion;
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 (16, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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3. A light emitting device comprising:
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a pixel portion;
a switching thin film transistor in the pixel portion;
a current control thin film transistor in the pixel portion;
at least an EL element electrically connected to the current control thin film transistor in the pixel portion;
wherein the switching thin film transistor is an n-channel thin film transistor;
wherein the current control thin film transistor is an n-channel thin film transistor;
a first pixel including a first EL element for emitting a red light in the pixel portion;
a second pixel including a second EL element for emitting a green light in the pixel portion;
a third pixel including a third EL element for emitting a blue light in the pixel portion;
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 (17, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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4. A light emitting device comprising:
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a pixel portion;
a switching thin film transistor in the pixel portion;
a current control thin film transistor in the pixel portion;
at least an EL element electrically connected to the current control thin film transistor in the pixel portion;
wherein the switching thin film transistor is a p-channel thin film transistor;
wherein the current control thin film transistor is a p-channel thin film transistor;
a first pixel including a first EL element for emitting a red light in the pixel portion;
a second pixel including a second EL element for emitting a green light in the pixel portion;
a third pixel including a third EL element for emitting a blue light in the pixel portion;
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 (18, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification