US7982222B2
Active / In Force
US
⏱️ 1.5 years remaining
EL display device and electronic device
Assignee: Semiconductor Energy Laboratory Co Ltd
•
Filing: 2008-04-11
•
Granted: 2011-07-19
•
Expires: 2028-04-11
Abstract
Abstract An EL display device capable of producing a vivid multi-gradation color display, and an electronic device having the EL display device. An electric current supplied to an EL element is controlled by providing a resistor between a current control TFT and the EL element formed in a pixel, the resistor having a resistance higher than the on-resistance of the current control TFT. The gradation display is executed by a time-division drive system which controls the emission and non-emission of light of the EL element by time, preventing the effect caused by a dispersion in the characteristics of the current control TFT.
Inventors
- 👤 Jun Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G09; G09G; G09G3/00; G09G3/20; G09G3/2007; G09G3/2018; G09G3/2022; G09G3/22; G09G3/30; G09G3/32; G09G3/3208; G09G3/3225; G09G3/3258; G09G3/3275; G09G3/3291; H; H10; H10D; H10D86/00; H10D86/40; H10D86/481; H10D86/60; H10H; H10H29/00; H10H29/10; H10H29/14; H10H29/142; H10K; H10K59/00; H10K59/10; H10K59/12; H10K59/121; H10K59/1213; H10K59/123; G09G2300/00; G09G2300/02; G09G2300/026; G09G2300/04; G09G2300/0404; G09G2300/0408; G09G2300/0421; G09G2300/0426; G09G2300/08; G09G2300/0809; G09G2300/0842; G09G2300/088; G09G2300/0885; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0221; G09G2310/04; G09G2320/00; G09G2320/02; G09G2320/0223; G09G2320/0233; G09G2320/04; G09G2320/043; G09G2330/00; G09G2330/02; G09G2330/021; G09G3/3233; H10D86/471; H10K59/126; H10K59/131
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
91 words
A display device comprising: a TFT provided over a substrate; an EL element provided over the substrate; and a resistor comprising a first semiconductor layer, wherein the EL element is electrically connected to one of a source and a drain of the TFT through at least the resistor, wherein an amount of light emitted from the EL element varies depending on an amount of direct current flowing through the EL element, wherein the TFT includes a second semiconductor layer, and wherein the first and the second semiconductor layers are same material.
Claim 2
Dependent Claim
91 words
A display device comprising: a TFT provided over a substrate; an EL element provided over the substrate; and a resistor comprising a first semiconductor layer, wherein the EL element is electrically connected to one of a source and a drain of the TFT through at least the resistor, wherein an amount of light emitted from the EL element varies depending on an amount of direct current flowing through the EL element, wherein the TFT includes a second semiconductor layer, and wherein the first and the second semiconductor layers are same material.
Claim 3
Dependent Claim
20 words
The display device according to claim 1 , wherein the resistor has a resistance of 1 kΩ to 50 MΩ.
Claim 4
Dependent Claim
15 words
The display device according to claim 1 , wherein the TFT is a top-gate transistor.
Claim 5
Dependent Claim
17 words
The display device according to claim 1 , wherein the EL element is an organic EL element.
Claim 6
Dependent Claim
17 words
The display device according to claim 1 , wherein the first semiconductor layer comprises an impurity element.
Claim 7
Dependent Claim
18 words
The display device according to claim 1 further comprising a light-shielding film provided over the first semiconductor layer.
Claim 8
Dependent Claim
123 words
A display device comprising: a first TFT provided over a substrate; a second TFT provided over the substrate, wherein a gate of the second TFT is electrically connected to one of a source and a drain of the first TFT; an EL element provided over the substrate; and a resistor comprising a first semiconductor layer, wherein the EL element is electrically connected to one of a source and a drain of the second TFT through at least the resistor, wherein an amount of light emitted from the EL element varies depending on an amount of direct current flowing through the EL element, wherein the second TFT includes a second semiconductor layer, and wherein the first and the second semiconductor layers are same material.
Claim 9
Dependent Claim
123 words
A display device comprising: a first TFT provided over a substrate; a second TFT provided over the substrate, wherein a gate of the second TFT is electrically connected to one of a source and a drain of the first TFT; an EL element provided over the substrate; and a resistor comprising a first semiconductor layer, wherein the EL element is electrically connected to one of a source and a drain of the second TFT through at least the resistor, wherein an amount of light emitted from the EL element varies depending on an amount of direct current flowing through the EL element, wherein the second TFT includes a second semiconductor layer, and wherein the first and the second semiconductor layers are same material.
Claim 10
Dependent Claim
20 words
The display device according to claim 7 , wherein the resistor has a resistance of 1 kΩ to 50 MΩ.
Claim 11
Dependent Claim
19 words
The display device according to claim 7 , wherein the first TFT and the second TFT are top-gate transistors.
Claim 12
Dependent Claim
20 words
The display device according to claim 7 , wherein the first TFT and the second TFT are n-channel type transistors.
Claim 13
Dependent Claim
17 words
The display device according to claim 7 , wherein the EL element is an organic EL element.
Claim 14
Dependent Claim
26 words
The display device according to claim 7 , wherein a channel width of the second TFT is wider than a channel width of the first TFT.
Claim 15
Dependent Claim
17 words
The display device according to claim 7 , wherein the first semiconductor layer comprises an impurity element.
Claim 16
Dependent Claim
18 words
The display device according to claim 7 further comprising a light-shielding film provided over the first semiconductor layer.
Claim 17
Dependent Claim
202 words
A display device comprising: a first line provided over a substrate; a second line provided perpendicular to the first line; a third line provided in parallel with the second line; a first TFT provided over the substrate, wherein a gate of the first TFT is electrically connected to the first line, and one of a source and a drain of the first TFT is electrically connected to the second line; a second TFT provided over the substrate, wherein a gate of the second TFT is electrically connected to the other of the source and the drain of the first TFT, one of a source and a drain of the second TFT is electrically connected to the third line; an EL element provided over the substrate; and a resistor comprising a first semiconductor layer, wherein the EL element is electrically connected to the other of the source and the drain of the second TFT through at least the resistor, wherein an amount of light emitted from the EL element varies depending on an amount of direct current flowing through the EL element, wherein the second TFT includes a second semiconductor layer, and wherein the first and the second semiconductor layers are same material.
Claim 18
Dependent Claim
202 words
A display device comprising: a first line provided over a substrate; a second line provided perpendicular to the first line; a third line provided in parallel with the second line; a first TFT provided over the substrate, wherein a gate of the first TFT is electrically connected to the first line, and one of a source and a drain of the first TFT is electrically connected to the second line; a second TFT provided over the substrate, wherein a gate of the second TFT is electrically connected to the other of the source and the drain of the first TFT, one of a source and a drain of the second TFT is electrically connected to the third line; an EL element provided over the substrate; and a resistor comprising a first semiconductor layer, wherein the EL element is electrically connected to the other of the source and the drain of the second TFT through at least the resistor, wherein an amount of light emitted from the EL element varies depending on an amount of direct current flowing through the EL element, wherein the second TFT includes a second semiconductor layer, and wherein the first and the second semiconductor layers are same material.
Claim 19
Dependent Claim
20 words
The display device according to claim 15 , wherein the resistor has a resistance of 1 kΩ to 50 MΩ.
Claim 20
Dependent Claim
19 words
The display device according to claim 15 , wherein the first TFT and the second TFT are top-gate transistors.
Claim 21
Dependent Claim
20 words
The display device according to claim 15 , wherein the first TFT and the second TFT are n-channel type transistors.
Claim 22
Dependent Claim
17 words
The display device according to claim 15 , wherein the EL element is an organic EL element.
Claim 23
Dependent Claim
26 words
The display device according to claim 15 , wherein a channel width of the second TFT is wider than a channel width of the first TFT.
Claim 24
Dependent Claim
17 words
The display device according to claim 15 , wherein the first semiconductor layer comprises an impurity element.
Claim 25
Dependent Claim
18 words
The display device according to claim 15 further comprising a light-shielding film provided over the first semiconductor layer.
Claim 26
Dependent Claim
107 words
A display device comprising: a first TFT provided over a substrate; a second TFT comprising a first semiconductor layer provided over the substrate, wherein a gate of the second TFT is electrically connected to one of a source and a drain of the first TFT; an EL element provided over the substrate; and a resistor comprising a second semiconductor layer, wherein the EL element is electrically connected to one of a source and a drain of the second TFT through at least the resistor, wherein the first semiconductor layer and the second semiconductor layer are same material, and wherein the first semiconductor layer is an LDD region.
Claim 27
Dependent Claim
107 words
A display device comprising: a first TFT provided over a substrate; a second TFT comprising a first semiconductor layer provided over the substrate, wherein a gate of the second TFT is electrically connected to one of a source and a drain of the first TFT; an EL element provided over the substrate; and a resistor comprising a second semiconductor layer, wherein the EL element is electrically connected to one of a source and a drain of the second TFT through at least the resistor, wherein the first semiconductor layer and the second semiconductor layer are same material, and wherein the first semiconductor layer is an LDD region.
Claim 28
Dependent Claim
20 words
The display device according to claim 23 , wherein the resistor has a resistance of 1 kΩ to 50 MΩ.
Claim 29
Dependent Claim
19 words
The display device according to claim 23 , wherein the first TFT and the second TFT are top-gate transistors.
Claim 30
Dependent Claim
20 words
The display device according to claim 23 , wherein the first TFT and the second TFT are n-channel type transistors.
Claim 31
Dependent Claim
17 words
The display device according to claim 23 , wherein the EL element is an organic EL element.
Claim 32
Dependent Claim
26 words
The display device according to claim 23 , wherein a channel width of the second TFT is wider than a channel width of the first TFT.
Claim 33
Dependent Claim
23 words
The display device according to claim 23 , wherein the first semiconductor layer and the second semiconductor layer comprises the same impurity element.
Claim 34
Dependent Claim
18 words
The display device according to claim 23 further comprising a light-shielding film provided over the second semiconductor layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2014-07-18 | 2015-01-17 | 2015-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2018-07-18 | 2019-01-17 | 2019-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2022-07-18 | 2023-01-17 | 2023-07-19 | $7700.00 | Window Closed / Lapsed |