Source: http://www.google.com/patents/US8188647?dq=7,134,016
Timestamp: 2017-03-24 06:36:42
Document Index: 584155915

Matched Legal Cases: ['Application No. 09', 'Application No. 09', 'Application No. 03075377', 'Application No 03', 'Application No. 03', 'Application No. 03076313', 'Application No. 03077303', 'Application No. 03075377', 'Application No. 2009', 'Application No. 2008', 'Application No. 07', 'Application No. 2008']

Patent US8188647 - Current-driven light-emitting display apparatus and method of producing the same - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn electroluminescent device including a substrate, a transistor disposed above the substrate, the transistor including a gate electrode, a silicon film opposing the gate electrode, and a gate insulating film between the gate electrode and the silicon film. The electroluminescent device including a first...http://www.google.com/patents/US8188647?utm_source=gb-gplus-sharePatent US8188647 - Current-driven light-emitting display apparatus and method of producing the sameAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8188647 B2Publication typeGrantApplication numberUS 12/379,680Publication dateMay 29, 2012Filing dateFeb 26, 2009Priority dateFeb 17, 1997Fee statusPaidAlso published asCN1217806A, CN1333382C, CN1625313A, CN100440569C, DE69819662D1, DE69819662T2, DE69838110D1, DE69838110T2, DE69838304D1, DE69838304T2, EP0917127A1, EP0917127A4, EP0917127B1, EP1337131A2, EP1337131A3, EP1337131B1, EP1363265A2, EP1363265A3, EP1363265B1, EP1619654A1, EP1619654B1, US6462722, US7180483, US8362489, US20020196206, US20030231273, US20090072758, US20090167148, WO1998036406A1Publication number12379680, 379680, US 8188647 B2, US 8188647B2, US-B2-8188647, US8188647 B2, US8188647B2InventorsMutsumi Kimura, Tomoyuki ItohOriginal AssigneeSeiko Epson CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (105), Non-Patent Citations (50), Referenced by (19), Classifications (35), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetCurrent-driven light-emitting display apparatus and method of producing the same
US 8188647 B2Abstract
An electroluminescent device including a substrate, a transistor disposed above the substrate, the transistor including a gate electrode, a silicon film opposing the gate electrode, and a gate insulating film between the gate electrode and the silicon film. The electroluminescent device including a first interlayer insulation film covering the transistor, a second interlayer insulation film disposed above the first interlayer insulation film, and a pixel electrode disposed above the second interlayer insulation film and electrically connected to the transistor. The electroluminescent device including an organic EL layer disposed between the pixel electrode and a counter electrode, and a capacitor including a first electrode formed by the same material as the silicon film and a second electrode formed by the same material as the gate electrode.
a transistor disposed above the substrate, the transistor including a gate electrode, a silicon film opposing the gate electrode, and a gate insulating film between the gate electrode and the silicon film;
a first interlayer insulation film covering the transistor;
a second interlayer insulation film disposed above the first interlayer insulation film;
a pixel electrode disposed above the second interlayer insulation film and electrically connected to the transistor;
an organic EL layer disposed between the pixel electrode and a counter electrode;
a capacitor including a first electrode formed by the same material as the silicon film and a second electrode formed by the same material as the gate electrode; and
a bank layer, the organic EL layer being formed in a region surrounded by the bank layer, wherein the capacitor is disposed at least in an area where the bank layer is not disposed when viewed in a direction perpendicular to a major surface of the substrate.
2. The electroluminescent device according to claim 1, the second interlayer insulation film being flattened.
3. The electroluminescent device according to claim 1, wherein the bank layer does not overlap the capacitor layer when viewed in the direction perpendicular to the major surface of the substrate.
4. An electroluminescent device comprising:
a capacitor including a first electrode formed in the same layer with the silicon film and a second electrode formed in the same layer with the gate electrode; and
5. The electroluminescent device according to claim 4, wherein the bank layer does not overlap the capacitor layer when viewed in the direction perpendicular to the major surface of the substrate. Description
This is a Continuation of application Ser. No. 12/289,243, filed Oct. 23, 2008, which in turn is a Continuation of application Ser. No. 10/465,878, filed Jun. 20, 2003, which in turn is a Division of application Ser. No. 10/224,412, filed Aug. 21, 2002, which in turn is a Division of application Ser. No. 09/155,644, filed Oct. 2, 1998, which in turn us the U.S. National Phase of PCT/JP98/00655, filed Feb. 17, 1998, which in turn claims priority of Japanese Application No. 09-032474, filed Feb. 17, 1997, and Japanese Application No. 09-066046, filed Mar. 19, 1997. The disclosure of the prior applications is hereby incorporated by reference herein in its entirety.
The invention relates to a display apparatus in which a current-driven light-emitting device, such as an organic electro luminescence (hereinafter referred to as “EL”) display device, are driven by using thin-film transistors. More particularly, the invention relates to a current-driven light-emitting display apparatus driven by thin-film-transistors, which realizes the suppression of deterioration with time, and to a method of producing the same.
FIG. 1 is a block diagram of the basic structure of a display to which the present invention is applied;
FIG. 6( a) is a sectional view of an organic display EL device equipped with thin-film transistors according to the first embodiment of the invention, and FIG. 6( b) is a plan view of an organic display EL device according to the first embodiment of the present invention;
FIG. 11( a) is a sectional view of an organic EL display device equipped with thin-film transistors according to the second embodiment of the present invention, and FIG. 11( b) is a plan view of an organic EL display device equipped with thin-film transistors according to the second embodiment of the present invention;
FIG. 14( a)-(d) are flow diagrams of the process for producing a thin-film-transistor-drive organic EL display device according to the present invention.
The General Structure of an Organic El Display Device
Formed in each of these pixels 7 is a first thin-film transistor (hereinafter referred to as “a switching thin-film transistor”) 121, in which scanning signals are supplied to a gate electrode 21 (a first gate electrode) through the scanning line 111. One end of the source/drain region of the switching thin-film transistor 121 is electrically connected to a data line 112, while the other end of the source/drain region is electrically connected to a potential holding electrode 113. In addition, a common line 114 is disposed in parallel to the scanning line 111. Holding capacitor 123 is formed between the common line 114 and the potential holding electrode 113. The common line is maintained at a controlled potential. Accordingly, when the switching thin-film transistor 121 is turned ON through the selection by a scanning signal, the image signal from the data line 112 is written to the holding capacitor 123 through the switching thin-film transistor.
The potential holding electrode 113 is electrically connected to the gate electrode of second thin-film transistor 122 (hereinafter referred to as “a current-thin-film transistor”). The one end of the source/drain region of the current-thin-film transistor 122 is electrically connected to a common line 114, while, the other end of the source/drain region is electrically connected to one electrode 115 of a luminescent element 131. When the current-thin-film transistor 122 is turned ON, the current of the common line 114 flows to the luminescent element 131 of such as an organic EL display device through the current-thin-film transistor 122, so that the luminescent element 131 emits light. Further, although one electrode of the holding capacitor is connected to a common line 114 in this arrangement, it is also possible for it to be connected to a capacitance line being provided separately, instead of being connected to the common line 114. Alternatively, one electrode of the holding capacitor may be connected to an adjacent gate line.
FIG. 2 is a block diagram of an organic EL display device equipped with thin-film transistors, according to a first embodiment of the present invention. FIG. 3 is a drive voltage diagram of an organic EL display device with thin-film transistors according to the first embodiment of the present invention. FIG. 4 is a current-voltage characteristic diagram of a current-thin-film transistor according to the first embodiment of the present invention. FIG. 5 is a current-voltage characteristic chart of an organic EL display device, according to the first embodiment of the present invention.
In FIG. 2, there are shown a scanning line 111, a data line 112, a holding electrode 113, a common line 114, a pixel electrode formed of Al 115, an opposite electrode formed of ITO 116, a switching thin-film transistor 121, an n-channel type current-thin-film transistor 122, a holding capacitor 123, an organic EL display element 131 (hereinafter referred to as “a forward oriented organic EL display device”) which is caused to emit light by the current flowing to the pixel electrode 115 from the opposite electrode 116, and the current directions of the organic EL display device 131 and 141.
FIG. 6( a) is a sectional view of a thin-film transistor organic EL display device (1 pixel) according to an embodiment of the present invention. FIG. 6( b) is a plan view of a thin-film transistor organic EL display device (1 pixel) according to an embodiment of the present invention. The section taken along the line A-A′ of FIG. 6( a) corresponds to the section taken along the line A-A′ of FIG. 6( b).
In FIG. 6( a), numeral 132 indicates a hole injection layer, numeral 133 indicates an organic EL layer, and numeral 151 indicates a resist.
In this example, the switching thin-film transistor 121 and the n-channel type current-thin-film transistor 122 adopt the structure and the process ordinarily used for a low-temperature polysilicon thin-film transistor, which are used for thin-film transistor liquid crystal display devices, i.e., a top-gate structure and a process conducted in the condition that the maximum temperature is 600° C. or less. However, other structures and processes are also applicable.
In the period 221 in which the pixel is in the display-state, the n-channel type current-thin-film transistor 122 is ON. The current which flows through the forward oriented organic EL display element 131, i.e., the ON-current of the n-channel type current-thin-film transistor 122 depends on the gate voltage, as shown in FIG. 4. Here, the term “gate voltage” means the potential difference between the holding potential 213 and the lower one of the common potential 214 and the pixel potential 215. In this embodiment, the common potential 214 is lower than the pixel potential 215, so that the gate voltage indicates the potential difference between the holding potential 213 and the common potential 214. The potential difference can be sufficiently large, so that a sufficiently large amount of ON-current is obtainable. The ON-current of the n-channel type current-thin-film transistor 122 also depends on the drain voltage. However, this does not affect the above situation.
In FIG. 7, there are shown a pixel electrode formed of ITO 615, an opposite electrode formed of Al 616, a p-channel type current-thin-film transistor 622, and an organic EL display device 631 (hereinafter referred to as “a reverse oriented organic EL display device”), which is caused to emit light by the current flowing to the Opposite electrode 616 from the pixel electrode 615. Numeral 641 indicates the direction of the current of the organic EL display device. This direction is the reverse of that shown in FIG. 2. Except for this, this embodiment is the same as the above first embodiment shown in FIG. 2.
FIG. 11( a) is a sectional view of an organic EL display device (1 pixel) equipped with the thin-film transistors, according to the second embodiment of the present invention. FIG. 11( b) is a plan view of a thin-film transistor organic EL display device (1 pixel), according to the second embodiment of the present invention. The section taken along the line A-A′ of FIG. 11( a) corresponds to the section taken along the line A-A′ of FIG. 11( b).
FIG. 11( a) is the same as FIG. 6( a), except that it shows a hole injection layer 632 and an organic EL layer 633.
As shown in FIG. 14( a), an amorphous silicon layer with a thickness of 200 to 600 angstroms is deposited all over a substrate 1, and the amorphous silicon layer is polycrystallized by laser annealing etc., to form a polycrystalline silicon layer. After this, patterning is performed on the polycrystalline silicon layer to form a silicon thin-film 421, which serves as a source/drain channel region of the switching thin-film transistor 121, a first electrode 423 of the storage capacitor 123, and a silicon thin-film 422, which serves as a source/drain channel region of the current-thin-film transistor 122. Next, an insulation film 424, which serves as a gate insulation film, is formed over the silicon thin-films 421, 422, and the first electrode 423. Then, implantation of phosphorous (P) ions is selectively effected on the first electrode 423 to lower the resistance thereof. Next, as shown in FIG. 14( b), gate electrodes 111 and 111′, which consist of TaN layers, are formed on the silicon thin-films 421 and 422 through the intermediation of the gate insulation film. Next, a resist mask 42 is formed on the silicon layer 422 serving as a current-thin-film transistor, and phosphorous (P) ions are implanted through self-alignment using the gate electrode as a mask to form an n-type source/drain region in the silicon layer 421. Subsequently, as shown in FIG. 14( c), a resist mask 412′ is formed on the first silicon layer 421 and the first electrode, and boron (B) is ion-implanted in the silicon layer 422 through self-alignment using the gate electrode 111′ as a mask to form a p-type source/drain region in the silicon layer 422. In this way, an n-channel type impurity doping 411 allows the switching thin-film transistor 121 to be formed. At this time, the current-thin-film transistor 122 is protected by the resist mask 42, so that the n-channel type impurity doping 411 is not performed. Then, a p-channel type impurity doping 412 allows the current-thin-film transistor 122 to be formed.
As shown in FIG. 14( d), after the formation of an inter-layer insulation film 43 and, then, contact holes, electrode layers 426, 427, 428 and 429 formed of aluminum, ITO or the like are formed.
Next, after an inter-layer insulation film 44 is formed and flattened, contact holes are formed; then, ITO 45 is formed with a thickness of 1000 to 2000 angstroms, preferably about 1600 angstroms, in such a manner that one electrode of the current-thin-film transistor is connected thereto. For each pixel region, bank layers 46 and 47, which are not less than 2.0 μm in width, are defined. Next, an organic EL layer 48 is formed by an ink-jet method etc., in the region surrounded by the bank layers 46 and 47. After the organic EL layer 48 is formed, an aluminum-lithium layer with a thickness of 6000 to 8000 angstroms is deposited as an opposite electrode 49 on the organic EL layer 48. Between the organic EL layer 48 and the opposite electrode 49, a hole injection layer may be disposed, as shown in FIG. 6( a).
The display apparatus according to the present invention can be used as a display apparatus equipped with a current-driven luminescent device such as an organic EL display device or an inorganic EL display device, and a switching device to drive the luminescent device, such as a thin-film transistor.
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Howard, "Active-Matrix Techniques for Display", Proceedings of the SID, Society for Information Display, 1986, vol. 27, No. 4, pp. 313-326.50Wu C et al., "Integration of Organix LED's and Amorphous Si TFT's onto Flexible and Lightweight Metal Foil Substrates," IEEE Electron Device Letters, vol. 18, No. 12, pp. 609-612, Dec. 1997.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8344992Oct 30, 2009Jan 1, 2013Semiconductor Energy Laboratory Co., Ltd.Display device and method for fabricating the sameUS8558241Sep 11, 2012Oct 15, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and fabrication method thereofUS8575619Sep 11, 2012Nov 5, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and fabrication method thereofUS8669925Oct 4, 2012Mar 11, 2014Semiconductor Energy Laboratory Co., Ltd.Light-emitting device and electric applianceUS8680517 *Jun 13, 2012Mar 25, 2014Lg Display Co., Ltd.Organic light emitting diode display device and method of manufacturing the sameUS8717262Dec 31, 2012May 6, 2014Semiconductor Energy Laboratory Co., Ltd.Display device and method for fabricating the sameUS8970576May 17, 2013Mar 3, 2015Semiconductor Energy Laboratory Co., Ltd.Image display device and driving method thereofUS9087476May 13, 2014Jul 21, 2015Semiconductor Energy Laboratory Co., Ltd.Display system and electrical applianceUS9263476Apr 28, 2014Feb 16, 2016Semiconductor Energy Laboratory Co., Ltd.Display device and method for fabricating the sameUS9293545Aug 5, 2014Mar 22, 2016Semiconductor Energy Laboratory Co., Ltd.Semiconductor deviceUS9368089Jul 16, 2015Jun 14, 2016Semiconductor Energy Laboratory Co., Ltd.Display system and electrical applianceUS9412309Feb 26, 2015Aug 9, 2016Semiconductor Energy Laboratory Co., Ltd.Image display device and driving method thereofUS9431431Nov 4, 2013Aug 30, 2016Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and fabrication method thereofUS9443461Jul 24, 2009Sep 13, 2016Semiconductor Energy Laboratory Co., Ltd.Electronic device and method of driving the sameUS9514670Apr 17, 2015Dec 6, 2016Semiconductor Energy Laboratory Co., Ltd.Display deviceUS9536468Oct 19, 2015Jan 3, 2017Semiconductor Energy Laboratory Co., Ltd.Display deviceUS20090284522 *Jul 24, 2009Nov 19, 2009Semiconductor Energy Laboratory Co., Ltd.Electronic Device and Method of Driving the SameUS20100045584 *Oct 30, 2009Feb 25, 2010Semiconductor Energy Laboratory Co., Ltd.Display Device and Method for Fabricating the SameUS20130221381 *Jun 13, 2012Aug 29, 2013Aram ShinOrganic light emitting diode display device and method of manufacturing the same* Cited by examinerClassifications U.S. Classification313/498, 313/506, 313/500International ClassificationH05B33/08, H01J1/28, H01L27/32, H01L51/52, G09G3/32, H01L51/50, G09F9/30Cooperative ClassificationH01L51/5234, H05B33/08, G09G3/3266, G09G3/3225, H01L27/3248, G09G2300/0842, H01L27/3244, Y02B20/325, G09G2300/0417, H01L51/5206, G09G2300/0439, H01L2251/5315, G09G3/3291, G09G2300/0819, G09G2310/06, G09G2300/0866, G09G2300/0876, G09G3/3233, G09G2320/043, H01L27/1255European ClassificationH05B33/08, G09G3/32A8C, G09G3/32A8, H01L27/12T, H01L27/32M2CLegal EventsDateCodeEventDescriptionApr 30, 2013ASAssignmentOwner name: INTELLECTUAL KEYSTONE TECHNOLOGY LLC, DELAWAREFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SEIKO EPSON CORPORATION;REEL/FRAME:030320/0775Effective date: 20130318Nov 24, 2015FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services