Source: http://www.docstoc.com/docs/57175903/Organic-Electroluminescence-Device-And-Method-For-Fabricating-Thereof---Patent-7394193
Timestamp: 2014-12-25 17:56:19
Document Index: 694888138

Matched Legal Cases: ['Application No. 02810619', 'Application No. 2001', 'art.\n2', 'art.\n9', 'art.\n15', 'art 14', 'art 14', 'art 14', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500', 'art 500']

Organic Electroluminescence Device And Method For Fabricating Thereof - Patent 7394193
United States Patent: 7394193
Organic electroluminescence device and method for fabricating thereof
There are provided an organic EL device and a method of fabricating the
same. An effective display area on which an anode electrode, an organic
luminescence layer and a cathode electrode are formed is sealed by means
of a metal can, a glass cap or an organic/inorganic material. A power
source is applied to the anode and the cathode electrodes through a power
transferring part extended from the effective display area to a
non-effective display area. Accordingly, it is possible to reduce the
oxidation of the cathode electrode of the organic EL device, thereby
preventing the electrical contact characteristics of the cathode
electrode from being deteriorated.
Choi; Joon-Hoo (Seoul, KR), Choi; Beom-Rak (Seoul, KR), Chai; Chong-Chul (Seoul, KR), Chung; Jin-Koo (Seoul, KR)
11/515,019
104763987102281
PCT/KR02/00987May., 2002
2001-28890
313/504  ; 313/506; 313/512; 445/23; 445/24
H05B 33/00&amp;nbsp(20060101)
313/504-506,512 428/917 315/169.3 445/23-25
6936846
5-190280
08-162270
11-26156
11-40344
2000-21564
2000-40586
2001-102166
Patent Abstracts of Japan, No. 08-162270, Jun. 21, 1996. cited by other
Patent Abstracts of Japan, No. 11-26156, Jan. 29, 1999. cited by other
Patent Abstracts of Japan, No. 11-40344, Feb. 12, 1999. cited by other
Patent Abstracts of Japan, No. 2000-21564, Jan. 21, 2000. cited by other
Patent Abstracts of Japan, No. 2001-102166, Apr. 13, 2001. cited by other
Patent Abstracts of Japan, Publication No. 05-190280, Jul. 30, 1993, 2 pp. cited by other
Patent Abstracts of Japan, Publication No. 2000-040586, Feb. 8, 2000, 1 p. cited by other
English translation of Office Action received in related Chinese Patent Application No. 02810619.9 (3 pp.). cited by other.
10/476,398 filed Oct. 31, 2003, now U.S. Pat. No. 7,102,281 by Joon-Hoo
CHOI, Beom-Rak CHOI, Chong-Chul CHAI, and Jin-Koo CHUNG entitled &quot;ORGANIC
ELECTROLUMINESCENCE DEVICE AND METHOD FOR FABRICATING THEREOF,&quot; which is
based on and claims priority from International Application No.
PCT/KR02/00987 filed May 24, 2002, which claims priority of Korean Patent
Application No. 2001-28890 filed May 25, 2001.
1.  An organic electro luminescence device comprising;  an anode electrode only being disposed in an effective display area;  an organic luminescence layer disposed on
the anode electrode;  a cathode electrode disposed on the organic luminescence layer;  a conductive film connected with the cathode electrode, and extending to a non-effective display;  and an insulating part disposed on the overall conductive film and
having contact holes formed through the insulating part.
2.  The organic electro luminescence device of claim 1, wherein the conductive film is partially exposed at a first portion to which the cathode electrode is connected and partially exposed at a second portion.
3.  The organic electro luminescence device of claim 1, wherein a common voltage is applied to the conductive film.
4.  The organic electro luminescence device of claim 1, further comprising: a gate electrode;  a gate insulating layer contacting the gate electrode;  a semiconductor layer contacting the gate insulating layer;  and a source electrode and a
drain electrode each contacting the semiconductor layer, the drain electrode being connected with the anode electrode.
5.  The organic electro luminescence device of claim 4, wherein the conductive film is simultaneously formed with the gate electrode.
6.  The organic electro luminescence device of claim 4, wherein the conductive film is simultaneously formed with the source electrode and the drain electrode.
7.  The organic electro luminescence device of claim 1, wherein the effective display area is surrounded by a sealing cap.
8.  A method of fabricating an organic electro luminescence device, comprising: forming an anode electrode only in an effective display area;  forming an organic electro luminescence layer on the anode electrode;  forming a conductive film
connected with the cathode electrode and extended to a non-effective display area;  forming a cathode electrode on the organic electro luminescence layer;  forming an insulating part on the overall conductive;  and forming contact holes through the
insulating part.
9.  The method of claim 8 further comprising partially exposing the conductive film at a first portion to which the cathode electrode is connected and at a second portion to which an external terminal is connected.
10.  The method of claim 8, further comprising: forming a gate electrode;  forming a gate insulating layer contacting the gate electrode;  forming a semiconductor layer contacting the gate insulating layer;  and forming a source electrode and a
11.  The method of claim 10, wherein the conductive film is simultaneously formed with the gate electrode.
12.  The method of claim 10, wherein the conductive film is simultaneously formed with the source electrode and the drain electrode.
13.  The method of claim 8, further comprising forming a shielding part for sealing the effective display area.
14.  An organic electro luminescence device comprising;  an anode electrode only being disposed in an effective display area;  an organic electro luminescence layer disposed on the anode electrode;  a cathode electrode disposed on the organic
electro luminescence layer;  a conductive film connected with the cathode electrode and extending to a non-effective display area;  an insulating part disposed on the conductive film;  and a sealant disposed on the insulating part.
15.  The organic electro luminescence device of claim 14, wherein the conductive film is partially exposed at a first portion to which the cathode electrode is connected, and partially exposed in the non-effective display area.
16.  The organic electro luminescence device of claim 14, wherein a common voltage is applied to the conductive film.
17.  The organic electro luminescence device of claim 14, further comprising: a gate electrode;  a gate insulating layer contacting the gate electrode;  a semiconductor layer contacting the gate insulating layer;  and a source electrode and a
18.  The organic electro luminescence device of claim 17, wherein the conductive film is simultaneously formed with the gate electrode.
19.  The organic electro luminescence device of claim 17, wherein the conductive film is simultaneously formed with the source electrode and the drain electrode.
20.  The organic electro luminescence device of claim 14, wherein the effective display area is surrounded by a sealing cap, the sealing cap having an edge contacting the sealant.
21.  A method of fabricating an organic electro luminescence device, comprising: forming an anode electrode only in an effective display area;  forming an organic electro luminescence layer on the anode electrode;  forming a cathode electrode on
the organic electro luminescence layer forming a conductive film connected with the cathode electrode and extending to a non-effective display area;  forming an insulating part on the conductive film;  and forming a sealant on at least a portion of the
22.  The method of claim 21, further comprising partially exposing the conductive film at a first portion to which the cathode electrode is connected and at a second portion in the non-effective display area.
23.  The method of claim 21, further comprising: forming a gate electrode;  forming a gate insulating layer contacting the gate electrode;  forming a semiconductor layer contacting the gate insulating layer;  and forming a source electrode and a
24.  The method of claim 23, wherein the conductive film is simultaneously formed with the gate electrode.
25.  The method of claim 23, wherein the conductive film is simultaneously formed with the source electrode and the drain electrode.
26.  The method of claim 21, further comprising forming a shielding part for sealing the effective display area.  Description
The present invention relates to an organic EL (Electro Luminescence) device and a method of fabricating the same, and more particularly, to an organic EL device capable of reducing an oxidation of a cathode electrode, the cathode electrode
applying a forward current to the organic EL material.
In these days, an organic luminescence material has been developed.  The organic luminescence material has characteristics of emitting a light when a forward current is applied to two electrodes interposing the organic luminescence therebetween.
Recently, an organic EL device has been developed by using the characteristics of the organic luminescence material.  The organic EL device is lighter in weight and smaller in size than that of an LCD (Liquid Crystal Display) device.
In order to display an image in a full-color in the organic EL display device, the organic EL requires an anode electrode, a cathode electrode and an organic luminescence layer having the organic luminescence material interposed between the anode
and the cathode electrodes.
The anode electrode is disposed on a transparent substrate in a matrix configuration.  The number of the anode electrode is three times as many as a resolution of organic EL device.  The cathode electrode 10 resolution of the organic EL device.
The anode electrode is connected with a thin film transistor disposed in the matrix configuration.  The anode electrode is made of a transparent conductive material such as an ITO (Indium Tin Oxide) or an IZO (Indium Zinc Oxide).
The thin film transistor includes a gate electrode, a source electrode, a drain electrode and a channel layer.  The gate electrode of the thin film transistor is connected with a gate line, and the source electrode of the thin film transistor is
connected with a data line.
Referring to FIG. 1, an anode electrode 1 is connected with the drain electrode of the thin film transistor.  The anode electrode I supplies holes to the organic EL material.
The organic EL material includes a Ted organic EL material 4 for emitting a light having a red wavelength, a green organic EL material 6 for emitting a light having a green wavelength and a blue organic EL material 8 for emitting a light having a
blue wavelength.  The red, green and blue EL materials 4, 6 and 8 are disposed on the anode electrode 1.
The cathode electrode 10 is disposed on the red, green and blue organic EL materials 4, 6 and 8 so as to supply electrons coupled to the holes provided from the anode electrode 1.  The cathode electrode 10 is comprised of a pure aluminum or an
aluminum alloy, and is disposed with a uniform thickness on a substrate to cover the anode electrode 1.
However, the organic EL materials 4, 6 and 8 are weak to oxygen and moisture in an atmosphere.  When the organic EL materials 4, 6 and 8 are exposed to the oxygen and the moisture, a macromolecule chain of the organic EL materials 4, 6 and 8 is
disconnected, or the organic EL materials 4, 6 and 8 are deteriorated because the organic EL materials 4, 6 and 8 react chemically with the oxygen and the moisture.
For this purpose, the organic EL materials 4, 6 and 8 are isolated from the oxygen and the moisture in the atmosphere by means of a metal can 12 and a sealant 12a.  As shown in FIG. 1, a terminal part 14 of the cathode electrode 10 is not sealed
by means of the metal can 12 and is exposed to the oxygen and the moisture in the atmosphere.
When the terminal part 14 of the cathode electrode 10 is exposed to the oxygen and the moisture in the atmosphere, an exposed portion of the terminal part 14 is oxidized, so that electrical characteristics of the cathode electrode 10 and display
characteristics of the organic EL device are deteriorated.
Accordingly, the present invention has been devised to solve the foregoing problems of the conventional art, and it is a first object of the present invention to provide an organic EL device for reducing the deterioration of the electrical
characteristics of a terminal part of a cathode electrode.
To accomplish the first object, there is provided an organic EL device comprising: a power supplying part for selectively supplying a power source having a predetermined level corresponding to image data; an anode electrode for receiving the
power source, the anode electrode being disposed on an effective display area; an organic luminescence layer disposed on the anode electrode; a cathode electrode disposed on the organic luminescence layer corresponding to the effective display area; a
power transferring part connected with the cathode electrode and extended to a non-effective display area covering the effective display area; and an insulating part disposed on the power transfer part, the insulating part partially exposed at a first
portion to which the cathode electrode is connected and exposed at a second portion to which an external terminal is connected.
To accomplish the second object, there is provided a method of fabricating an organic EL device, comprising: forming a thin film transistor on an effective display area in a matrix configuration; forming a power transferring part extended from
the effective display area to a non-effective display area covering the effective display area when forming the thin film transistor; forming an insulating part on the power transferring part, the insulating part partially being exposed at a first
portion of the effective display area and at a second portion of the non-effective display area; forming an anode electrode on an output terminal of the thin film transistor, the anode electrode receiving the power source having a predetermined level
corresponding to image data; forming an organic luminescence layer on the anode electrode, the organic luminescence layer emitting a light of a predetermined wavelength; forming a cathode electrode on the organic luminescence layer in the effective
display area, the cathode electrode being electrically connected with the power transferring part; and forming a shielding part for sealing the effective display area.
Referring to FIG. 2, an organic EL device 200 includes a plurality of organic EL elements 210, 220 and 230.  In the present embodiment, one organic EL element 210 among three organic EL elements 210, 220 and 230 will be described.
The driving signal line referred to as a reference numeral 250 indicates a gate line connected with a gate electrode 292 of the switching transistor 290.  The driving signal line referred to as a reference numeral 260 indicates a data line
connected with a source electrode of the switching transistor 290.  The data line is perpendicular to the gate line 250.  The driving signal line referred to, as a reference numeral 270 indicates a bias line parallel to the data line 260.
The drain electrode 296 of the switching transistor 290, which is operated as an output terminal, is connected with a first electrode 242 of the image maintaining capacitor 240, and simultaneously connected with a gate electrode 302 of the
driving transistor 300 in parallel.
A second electrode 244, which is opposite to the first electrode 242 of the image maintaining capacitor 240, and a source electrode 304 of the driving transistor 300 are connected with a bias line 270 to which a predetermined power source is
applied.  A drain electrode 306 of the driving transistor 300 is connected with the pixel 280.
A predetermined power source is applied to all data line 260 sequentially.  The first gate line 250 receives a power source that has enough voltage to turn on the switching transistor 290 for a short period.  The channel layer of the switching
transistor 290 remains as a conduction state according as the power source is applied to the gate line.  The power source applied to the data line 260 is output to the drain electrode 296 of the switching transistor 290 through the source electrode 294
and the channel layer (not shown) thereof.
Firstly, the power source is output to the first electrode 242 of the image maintaining capacitor 240.  Since the second electrode 244 of the image maintaining capacitor 240 has already received the power source, the image maintaining capacitor
240 is charged with electrical charges when the first electrode 242 receives the power source.
Secondly, the power source is output to the gate electrode 302 of the driving transistor 300.  Since the source electrode 304 of the driving transistor 300 has already received the power source from the bias line 270, the power source applied to
the source electrode 304 is output to the drain electrode 306 through the channel layer when the power source is applied to the gate electrode 302 of the driving transistor 300.  The power source output to the drain electrode 306 is applied to the pixel
However, when the switching transistor 290 is turned off, the image maintaining capacitor 240 is discharged.  Accordingly, the driving transistor 300 turns on for a period of a frame of an image.
Referring to FIG. 3, the pixel 280 includes a transparent conductive anode electrode 282, an organic luminescence layer 283 formed on the upper surface of the anode electrode 282, a cathode electrode 284 formed over the organic luminescence layer
283 with a uniform thickness, and a power transferring part 500.
Reference numerals &quot;410&quot; and &quot;420&quot; indicate an effective display area and a non-effective display area, respectively.  The image is displayed through the effective display area.
The anode electrode 282, the organic luminescence layer 283 and the cathode electrode 284 are disposed in the effective display area 410.  The effective display area 410 is encapsulated by means of the sealing cap to prevent the effective display
area 410 from being deteriorated by the oxygen or the moisture.  The cathode electrode 284 is not oxidized because the cathode electrode 284 is sealed by means of the sealing cap 700.
However, when the cathode electrode 284 is isolated from the oxygen or the moisture by means of the sealing cap 700, the power source from the non-effective area cannot be applied to the cathode electrode 284.  For example, the sealing cap 700
may be a metal can.
Particularly, the first end of the power transferring part 500 is connected with the cathode electrode 284 disposed in the effective display area 410, and the second end of the power transferring part 500 is connected with the external terminal
(not shown) disposed in the non-effective display area.
The power transferring part 500 is covered by means of an insulating thin film 600 except two portions of the power transferring part 500.  A first portion of the power transferring part 500 is a portion that is connected with the external
terminal, and the second portion of the power transferring part 500 is a portion that is connected with the cathode electrode 284.  For example, the power transferring part 500 may be a conductive film.
The driving thin film transistor 300 includes a channel layer 301, a first insulating layer 305, a gate electrode 302, a second insulating layer 308, a contact hole 309, a source electrode 304 and a drain electrode 306.  Processes for forming the
driving thin film transistor 300 are the same as that of the switching thin film transistor, so that the switching thin film transistor has the driving thin film transistor 300.
The channel layer 301 is formed by depositing an amorphous silicon layer on the substrate 281 and by patterning the amorphous silicon layer by means of a photolithography process.  Amorphous silicon doped by n+ ions may be used instead of the
After forming a gate metal layer on the first insulating layer 305, the gate metal layer is patterned to form the gate electrode 302.  The gate electrode 302 is disposed on the portion, which corresponds to the upper surface of the channel layer
301, of the first insulating layer 305.  In the process of forming the gate electrode 302, the power transferring part 500 may be formed.  For example, the gate electrode 302 and the power transferring part 500 may be formed simultaneously.
The second insulating layer 308 insulates the gate electrode 302.  For this purpose, the second insulating layer 308 is formed over the substrate 281.
The contact hole 309 is formed by partially etching the first and the second insulating layers 305 and 308 via a photolithography process.  The contact hole 309 is placed at both sides of the gate electrode 302, which is adjacent to the gate
electrode 302.  The channel layer 301 is exposed through the contact hole 309.
In the process of forming the source and the drain electrode 304 and 306, the power transferring part 500 may be formed, which is extended from the effective display area 410 to the non-effective display area 420.  For example, the source
electrode and the drain electrode 304, 306, and the power transferring part 500 may be formed simultaneously.
The third insulating layer 600 is patterned to form contact holes 610, 620 and 630, the contact hole 610 is formed on a portion of the drain electrode 306, the contact hole 620 is formed on the effective display area of the power transferring
part 500, and the contact holes 630 is formed on the non-effective display areas of the power transferring part 500.
Referring to FIG. 6, in order to form the anode electrode 282, a thin film made of the ITO or the IZO is deposited on the third insulating layer 600.  The thin film is patterned to form the anode electrode 282, and the anode electrode 282 is
connected with the drain electrode 306.
Referring to FIG. 7, the organic luminescence layer 283 is partially formed on, the anode electrode 282.  The organic luminescence layer 283 includes the red organic luminescence for emitting the light having the red wavelength, the green organic
luminescence for emitting the light having the green wavelength or the blue organic luminescence for emitting the light having the blue wavelength.  The reference numeral &quot;282a&quot; is an organic wall wrapping an edge portion of the anode electrode 282 as
Referring to FIG. 9, the sealing cap 700 is formed to seal the effective display area 410 by means of a sealant 710.  For example, the sealing cap 700 may be a metal can.
The data line 260 receives a predetermined power source.  The gate line 250 receives a power source having a voltage level higher than a threshold voltage for the switching transistor 290.
Next, the power source applied to the drain electrode 296 of the switching transistor 290 charges the image maintaining capacitor 240, and simultaneously applies a power source having a voltage level higher than the threshold voltage to the gate
electrode 302 of the driving transistor 300.
The power source having the voltage level higher than the threshold voltage is applied to the gate line 250 for a short period.  When it is stopped to apply the power source to the drain electrode 296 of the switching transistor 290, electric
charges charged into the image maintaining capacitor 240 is discharged.
Accordingly, the power source charged into the image maintaining capacitor 240 is applied as a turn on voltage to the gate electrode 302 of the driving transistor 300 during a time corresponding to a frame.  As a result, the anode electrode 282
receives a predetermined current from the bias line 270 while the image maintaining capacitance 540 is in a discharge state.
The power source V.sub.cathode supplied from the external terminal is supplied to the effective display area 410 from the non-effective display area 420 through the power transferring part 500.  The V.sub.cathode applied to effective display area
410 is applied to the cathode electrode 284.  For example, a common voltage may be applied to the power transferring part 500.
Thus, the cathode electrode 284 supplies the electrons to the organic luminescence layer 283, and the anode electrode 583 continuously supplies the holes.  As a result, an energy level change, which is caused by bonding the electrons and the
holes, occurs in the organic luminescence layer 283.
As described previously, the cathode electrode is formed only on the effective display area sealed by means of the sealing cap such as the metal can.  Also, the power source for the cathode electrode is applied through the power transferring part
extended from the effective display area to the non-effective display area.  Accordingly, it is possible to reduce the oxidation at the cathode electrode of the organic EL device, thereby preventing the electrical contact characteristics of the cathode
This invention has been described above with reference to the aforementioned embodiments.  It is evident, however, that many alternative modifications and variations will be apparent to those having skills in the art in light of the foregoing
description.  Accordingly, the present invention embraces all such alternative modifications and variations as fall within the spirit and scope of the appended claims.
Organic electroluminescence device and method for fabricating thereof, Choi, et al., Joon-Hoo Choi, Beom-Rak Choi, Chong-Chul Chai, Jin-Koo Chung, Application number 11 515-019, Electric Lamp And Discharge Devices, Electric Lamp Or Space Discharge Component Or Device Manufacturing, thin film transistor, DISPLAY DEVICE, Organic electroluminescence, Liquid crystal display, Semiconductor device, gate electrode, electro luminescence, Patent Documents, display panel, ORGANIC LIGHT
The present invention relates to an organic EL (Electro Luminescence) device and a method of fabricating the same, and more particularly, to an organic EL device capable of reducing an oxidation of a cathode electrode, the cathode electrodeapplying a forward current to the organic EL material.BACKGROUND ARTIn these days, an organic luminescence material has been developed. The organic luminescence material has characteristics of emitting a light when a forward current is applied to two electrodes interposing the organic luminescence therebetween.The organic luminescence material can emit a light having a red wavelength, a light having a green wavelength and a light having a blue wavelength according to the characteristics thereof.Recently, an organic EL device has been developed by using the characteristics of the organic luminescence material. The organic EL device is lighter in weight and smaller in size than that of an LCD (Liquid Crystal Display) device.In order to display an image in a full-color in the organic EL display device, the organic EL requires an anode electrode, a cathode electrode and an organic luminescence layer having the organic luminescence material interposed between the anodeand the cathode electrodes.The anode electrode is disposed on a transparent substrate in a matrix configuration. The number of the anode electrode is three times as many as a resolution of organic EL device. The cathode electrode 10 resolution of the organic EL device. The anode electrode is connected with a thin film transistor disposed in the matrix configuration. The anode electrode is made of a transparent conductive material such as an ITO (Indium Tin Oxide) or an IZO (Indium Zinc Oxide).The thin film transistor includes a gate electrode, a source electrode, a drain electrode and a channel layer. The gate electrode of the thin film transistor is connected with a gate line, and the source electrode of the thin film transistor isconnected with a data line.FIG. 1
ELECTROLUMINESCENCE 2008018737 Material For An Organic Electroluminescence Device And An Organic Electroluminescence Device - Patent 8119828