Light emitting device
First Claim
Patent Images
1. A light emitting device comprising:
- a switching TFT provided over a substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the current control TFT and the EL element are provided in a pixel, wherein an impurity region of the switching TFT is electrically connected with a gate electrode of the current control TFT, wherein an impurity region of the current control TFT is electrically connected with the EL element, and wherein the gate electrode of the current control TFT exists at a position where the gate electrode does not overlap the impurity region of the current control TFT through a gate insulating film.
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Abstract
There is provided a light emitting device including a TFT having a high driving capacity (on current) and high reliability in a driver circuit and a TFT in which an off current is reduced in a pixel portion. In manufacturing the TFTs, after the TFT having an LDD region is formed, a part of a gate electrode is etched to form the TFT having GOLD region. Thus, the TFTs having required functions can be easily formed in the driver circuit and the pixel portion, respectively, on the same substrate.
56 Citations
59 Claims
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1. A light emitting device comprising:
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a switching TFT provided over a substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the current control TFT and the EL element are provided in a pixel, wherein an impurity region of the switching TFT is electrically connected with a gate electrode of the current control TFT, wherein an impurity region of the current control TFT is electrically connected with the EL element, and wherein the gate electrode of the current control TFT exists at a position where the gate electrode does not overlap the impurity region of the current control TFT through a gate insulating film. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A light emitting device comprising:
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a switching TFT provided over a substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the current control TFT and the EL element are provided in a pixel, wherein a drain region of the switching TFT is electrically connected with a gate electrode of the current control TFT, wherein a drain region of the current control TFT is electrically connected with the EL element, and wherein the gate electrode of the current control TFT exists at a position where the gate electrode does not overlap a source region and the drain region of the current control TFT through a gate insulating film. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A light emitting device comprising:
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a switching TFT provided over a substrate;
an erase TFT provided over the substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the erase TFT and the current control TFT and the EL element are provided in a pixel, wherein impurity regions of the switching TFT and the erase TFT are electrically connected with a gate electrode of the current control TFT, wherein an impurity region of the current control TFT is electrically connected with the EL element, and wherein the gate electrode of the current control TFT exists at a position where the gate electrode does not overlap the impurity region of the current control TFT through a gate insulating film. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A light emitting device comprising:
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a switching TFT provided over a substrate;
an erase TFT provided over the substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the erase TFT and the current control TFT and the EL element are provided in a pixel, wherein drain regions of the switching TFT and the erase TFT are electrically connected with a gate electrode of the current control TFT, wherein a drain region of the current control TFT is electrically connected with the EL element, and wherein the gate electrode of the current control TFT exists at a position where the gate electrode does not overlap a source region and the drain region of the current control TFT through a gate insulating film. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A light emitting device comprising:
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a switching TFT provided over a substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the current control TFT and the EL element are provided in a pixel, wherein an impurity region of the switching TFT is electrically connected with a gate electrode of the current control TFT, wherein an impurity region of the current control TFT is electrically connected with the EL element, and wherein a gate electrode of the switching TFT exists at a position where the gate electrode does not overlap the impurity region of the switching TFT through a gate insulating film. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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37. A light emitting device comprising:
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a switching TFT provided over a substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the current control TFT and the EL element are provided in a pixel, wherein a drain region of the switching TFT is electrically connected with a gate electrode of the current control TFT, wherein a drain region of the current control TFT is electrically connected with the EL element, and wherein a gate electrode of the switching TFT exists at a position where the gate electrode does not overlap an impurity region of the switching TFT through a gate insulating film. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A light emitting device comprising:
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a switching TFT provided over a substrate;
an erase TFT provided over the substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein impurity regions of the switching TFT and the erase TFT are electrically connected with a gate electrode of the current control TFT, wherein an impurity region of the current control TFT is electrically connected with the EL element, and wherein gate electrodes of the switching TFT and the erase TFT exist at respective positions where the gate electrodes do not overlap the impurity regions of the switching TFT and the erase TFT, respectively, through a gate insulating film. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
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52. A light emitting device comprising:
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a switching TFT provided over a substrate;
an erase TFT provided over the substrate;
a current control TFT provided over the substrate; and
an EL element provided over the substrate, wherein the switching TFT and the erase TFT and the current control TFT and the EL element are provided in a pixel, wherein drain regions of the switching TFT and the erase TFT are electrically connected with a gate electrode of the current control TFT, wherein a drain region of the current control TFT is electrically connected with the EL element, and wherein gate electrodes of the switching TFT and the erase TFT exist at respective positions where the gate electrodes do not overlap impurity regions of the switching TFT and the erase TFT, respectively, through a gate insulating film. - View Dependent Claims (53, 54, 55, 56, 57, 58, 59)
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Specification