CN101872781A - Image display system - Google Patents
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- CN101872781A CN101872781A CN200910136071A CN200910136071A CN101872781A CN 101872781 A CN101872781 A CN 101872781A CN 200910136071 A CN200910136071 A CN 200910136071A CN 200910136071 A CN200910136071 A CN 200910136071A CN 101872781 A CN101872781 A CN 101872781A
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Abstract
The invention discloses an image display system, which comprises a tandem electroluminescent device. The tandem electroluminescent device comprises a first electrode, the first organic electroluminescent unit to the Nth organic electroluminescent unit, a second electrode and (N-1) connecting electrodes, wherein the first organic electroluminescent unit to the Nth organic electroluminescent unit are configured on the first electrode in turn, wherein N is more than or equal to 2 and is a positive integer; the second electrode is configured on the Nth organic electroluminescent unit; each connecting electrode is arranged between any two adjacent organic electroluminescent units; the first organic electroluminescent unit comprises a first luminous layer and a second luminous layer in turn from the side of the first electrode; the first luminous layer and the second luminous layer have different physical quantities; and the Nth organic electroluminescent unit comprises a third luminous layer and a fourth luminous layer in turn from the side of the first electrode, wherein the third luminous layer and the second luminous layer have the same physical quantity, and the fourth luminous layer and the first luminous layer have the same physical quantity.
Description
Technical field
The present invention relates to a kind of image display system that comprises el light emitting device, particularly relate to a kind of image display system that comprises the tandem el light emitting device.
Background technology
In recent years, along with the progress of electronic product Development Technology and increasingly extensive application thereof, it similarly is the city of asking of mobile phone and notebook computer, make the demand of comparing flat-panel screens with traditional monitor grow with each passing day, become one of present most important electronic application product with smaller size smaller and power consumption characteristic.In the middle of flat-panel screens because organic electroluminescent spare has characteristics such as self-luminous, high brightness, wide viewing angle, high answer speed and technology is easy, make organic electroluminescent spare undoubtedly will become next optimal selection of flat-panel screens from generation to generation.
Organic electroluminescent spare is used on the flat panel display (flat panel display) in recent years gradually for using the light-emitting diode of organic layer as active layer.Developing the organic electroluminescent device with high-luminous-efficiency and long life is one of main trend of present plane Display Technique.
Be the further purpose that increases the brightness of the single pixel of organic electroluminescent device and reach full-colorization, a kind of tandem Organnic electroluminescent device (tandem) that is called is proposed by industry.Known tandem Organnic electroluminescent device is respectively with a plurality of luminescence unit vertical stackings, and links to each other with connection electrode between per two adjacent luminescence units, and drives with single power supply.Therefore yet known tandem Organnic electroluminescent device because that its red bluish-green luminescent layer of each luminescence unit puts in order is all identical, causes the photochromic instability of sending, and can change along with the drive current size.
Summary of the invention
Provide a kind of image display system according to the embodiment of the invention, comprising: the tandem el light emitting device, it comprises: first electrode; First to the N organic electroluminescence cell, is disposed in regular turn on first electrode, and wherein N is more than or equal to 2, and is positive integer; Second electrode is disposed on the N organic electroluminescence cell; And, (N-1) individual connection electrode, wherein each connection electrode is arranged between the wantonly two adjacent organic electroluminescence cells.Wherein, first organic electroluminescence cell is comprised in regular turn by the first electrode side: first luminescent layer, and second luminescent layer, wherein first luminescent layer has different physical quantitys with second luminescent layer, and the N organic electroluminescence cell is comprised in regular turn by the first electrode side: the 3rd luminescent layer, and the 4th luminescent layer, wherein the 3rd luminescent layer and the identical physical quantity of the second luminescent layer tool, the 4th luminescent layer and the identical physical quantity of the first luminescent layer tool.
Description of drawings
Fig. 1 shows its generalized section of tandem el light emitting device according to the preferred embodiment of the invention;
Fig. 2 shows its generalized section of tandem el light emitting device of another preferred embodiment according to the present invention;
Fig. 3 and Fig. 4 show its generalized section of tandem el light emitting device of another preferred embodiment according to the present invention, and wherein this tandem el light emitting device comprises the organic electroluminescence cell with barrier layer;
Fig. 5 shows its generalized section of tandem el light emitting device of the another preferred embodiment according to the present invention;
Fig. 6 shows its generalized section of tandem el light emitting device of other preferred embodiments according to the present invention, and wherein this tandem el light emitting device comprises the organic electroluminescence cell with barrier layer;
Fig. 7 shows its generalized section of tandem el light emitting device with N organic electroluminescence cell of other preferred embodiments according to the present invention; And
Fig. 8 shows image display system block schematic diagram according to another embodiment of the present invention.
Description of reference numerals
1,101,201: the first organic electroluminescence cells
2,102,202: the second organic electroluminescence cells
100,200,300: the tandem el light emitting device
103,203,303: substrate
104,204,304: anode
105: organic material layer
106.1,106.2,206.1,206.2: hole injection layer
108.1,108.2,108.1,208.2: hole transmission layer
110.1,110.2,112.1,112.2,114.1,114.2,210.1,210.2,212.1,212.2,310.1,310.N, 312.1,312.N, 314.1,314.N: luminescent layer
116.1,116.2,216.2,216.2: electron transfer layer
118,218,318: connection electrode
120,220,320: negative electrode
122.1,122.2,222.1,222.2: barrier layer
400: display unit
450: input unit
500: electronic installation
N: N organic electroluminescence cell
Embodiment
Below with conjunction with figs., with the explanation according to the image display system that comprises the tandem el light emitting device provided by the present invention.
Please refer to Fig. 1, show the tandem el light emitting device 100 that image display system comprised according to the embodiment of the invention.At this, be example with tandem el light emitting device 100 with two organic electroluminescence cells 101 and 102.In other embodiments, the tandem el light emitting device also can comprise plural organic electroluminescence cell.Tandem el light emitting device 100 comprises substrate 103, for example: glass, pottery, plastic substrate, semiconductor substrate or metal substrate (metal foil).Substrate 103 can optionally be selected for use, and also even desire forms illuminated organic electroluminescent device, and then this substrate also can be opaque substrate: in addition, if desire forms down luminous or lighting at two sides formula organic electroluminescent device, then this substrate can be transparency carrier.First electrode for example anode (anode) 104 is formed at the upper surface of substrate 103.
First organic electroluminescence cell 101 is formed on the anode 104.First organic electroluminescence cell 101 is comprised in regular turn by anode-side (from the anode side) number: luminescent layer 110.1, luminescent layer 112.1, and luminescent layer 114.1, and also can comprise hole injection layer 106.1, hole transmission layer 108.1 is formed between luminescent layer 110.1 and the anode 104, and electron transfer layer 116.1 is formed on the luminescent layer 114.1.It should be noted that luminescent layer 110.1, luminescent layer 112.1, and luminescent layer 114.1 have different physical quantitys.At this, this physical quantity is meant the whole layer quantifiable character that luminescent layer showed, for example: emission wavelength (similarly being the wavelength that has maximum intensity in the luminescent spectrum), electron mobility (being meant the transfer ability of electronics in this luminescent layer) or hole mobility (being meant the transfer ability of hole in this luminescent layer).In addition, but each self-contained alloy (dopant) of each luminescent layer (for example fluorescence (fluorescence) or phosphorescence (phosphorescence) luminescent material), and it is red, blue or green etc. photochromic that it is sent separately.At this, luminescent layer 110.1, luminescent layer 112.1, and luminescent layer 114.1 can have different emission wavelengths, for example be respectively and select in free red, green and the group that blue light-emitting layer is formed.
Still please refer to Fig. 1, connection electrode 118 is formed on first organic electroluminescence cell 101, in order to separate follow-up formed second organic electroluminescence cell 102.The material of connection electrode 118, and without particular limitation, can be known any suitable electric conducting material.
Second organic electroluminescence cell 102 is disposed on the connection electrode 108.According to the present invention, the luminescent layer that second organic electroluminescence cell 102 (organic electroluminescence cell of the most close negative electrode 120) is comprised can be identical with first organic electroluminescence cell 101 (organic electroluminescence cell of the most close anode 104), but the putting in order of second organic electroluminescence cell, 102 luminescent layers (being come by the anode-side number) can be opposite with putting in order of first organic electroluminescence cell, 101 luminescent layers.Therefore, second organic electroluminescence cell 102 is comprised in regular turn by anode 104 side numbers: luminescent layer 114.2 (with the identical physical quantity of luminescent layer 114.1 tools), luminescent layer 112.2 (with the identical physical quantity of luminescent layer 112.1 tools), and luminescent layer 110.2 (with the identical physical quantity of luminescent layer 110.1 tools), and also can comprise hole injection layer 106.2, hole transmission layer 108.2 and be formed at luminescent layer 114.2 and link between the electrode 118, and electron transfer layer 116.2 is formed on the luminescent layer 110.2.The composition of luminescent layer 110.1 and luminescent layer 110.2 is identical, the composition of luminescent layer 112.1 and luminescent layer 112.2 is identical and composition luminescent layer 114.1 and luminescent layer 114.2 is identical.
Second electrode for example negative electrode (cathode) 120 is disposed on second organic electroluminescence cell 102.Anode 104 and negative electrode 120 be independence and can be transparency electrode, metal electrode or combination electrode separately, its material can for example be Ca, Ag, Mg, Al, Li, Au, Cu,, indium tin oxide (ITO), indium-zinc oxide (IZO), Zinc-aluminium (AZO), zinc oxide (ZnO) or its combination, and its generation type can be hot evaporation, sputter or chemical vapour deposition (CVD) mode.Wherein, one of them is a transparency electrode at least for this anode 104 and this negative electrode 120.
According to another embodiment of the present invention; second organic electroluminescence cell 102 is except comprising first organic electroluminescence cell, 101 all luminescent layers and putting in order on the contrary; second organic electroluminescence cell can also comprise at least one organic material layer 105; wherein organic material layer 105 can be the rete that known organic electroluminescent LED comprises; for example: luminescent layer, carrier injection layer, carrier blocking layers, resilient coating or protective layer please refer to Fig. 2.
According to other embodiments of the invention, first organic electroluminescence cell 101 can also comprise barrier layer 122.1 and be formed between luminescent layer 110.1 and the luminescent layer 112.1, and second organic electroluminescence cell 102 comprises barrier layer 122.2 equally and is formed between luminescent layer 110.2 and the luminescent layer 112.2, color degree of saturation (NTSC ratio) with further increase Organic Light Emitting Diode please refer to Fig. 3.Barrier layer 122.1 and 122.2 can be double carriers (bipolar) material, electronics or hole mobile material.In addition, barrier layer 122.1 (or 122.2) also can be formed between the luminescent layer 112.1 and luminescent layer 114.1 of first organic electroluminescence cell 101 (also can be between the luminescent layer 112.2 and luminescent layer 114.2 of second organic electroluminescence cell 102), please refer to Fig. 4.
Please refer to Fig. 5, demonstration is according to the tandem el light emitting device 200 of the embodiment of the invention, comprise substrate 203, on substrate 203, dispose anode 204, first organic electroluminescence cell 201, binding electrode 218, second organic electroluminescence cell 202 in regular turn, reach negative electrode 220.
First organic electroluminescence cell 201 is comprised in regular turn by the anode-side number: luminescent layer 210.1 and luminescent layer 212.1, and also can comprise hole injection layer 206.1, hole transmission layer 208.1 and be formed between luminescent layer 210.1 and the anode 204 and electron transfer layer 216.1 is formed on the luminescent layer 212.1.It should be noted that luminescent layer 210.1 and luminescent layer 212.1 have different physical quantitys, and luminescent layer 210.1 and luminescent layer 212.1 one of them comprises two kinds of alloys at least.For instance, luminescent layer 210.1 can have the ruddiness alloy, and luminescent layer 212.1 has blue light alloy and green glow alloy; Luminescent layer 210.1 has the blue light alloy, and luminescent layer 212.1 has ruddiness alloy and green glow alloy; Luminescent layer 210.1 has the green glow alloy, and luminescent layer 212.1 has blue light alloy and ruddiness alloy; Luminescent layer 210.1 can have blue light alloy and green glow alloy, and luminescent layer 212.1 has the ruddiness alloy; Luminescent layer 210.1 has ruddiness alloy and green glow alloy, and luminescent layer 212.1 has the blue light alloy; Or luminescent layer 210.1 has blue light alloy and ruddiness alloy, and luminescent layer 212.1 has the green glow alloy.
In addition, as shown in Figure 5, the luminescent layer and first organic electroluminescence cell 201 (organic electroluminescence cell of the most close anode 204) that second organic electroluminescence cell 202 (organic electroluminescence cell of the most close negative electrode 220) is comprised can be identical, but the putting in order of second organic electroluminescence cell, 202 luminescent layers (being come by anode 204 side numbers) can be opposite with putting in order of first organic electroluminescence cell, 201 luminescent layers.Therefore, second organic electroluminescence cell 202 is comprised in regular turn by anode 204 side numbers: luminescent layer 212.2 (with the identical physical quantity of luminescent layer 212.1 tools), and luminescent layer 210.2 (with the identical physical quantity of luminescent layer 210.1 tools), and also can comprise hole injection layer 206.2, hole transmission layer 208.2 and be formed at luminescent layer 212.2 and link between the electrode 218, and electron transfer layer 216.2 is formed on the luminescent layer 210.2.The composition of luminescent layer 210.1 and luminescent layer 210.2 is identical, and the composition of luminescent layer 212.1 and luminescent layer 212.2 is identical.
According to another embodiment of the present invention, first organic electroluminescence cell 201 can also comprise barrier layer 222.1 and be formed between luminescent layer 210.1 and the luminescent layer 212.1, and second organic electroluminescence cell 202 also can comprise barrier layer 222.2 and be formed between luminescent layer 210.2 and the luminescent layer 212.2, please refer to Fig. 6.
According to other embodiments of the invention, the tandem el light emitting device that image display system of the present invention comprised can comprise N or above organic electroluminescence cell, and wherein N is more than or equal to 2, and is positive integer.Please refer to Fig. 7, show organic electroluminescence cell with N (N greater than 2, can for example be 3,4,5 ...) tandem el light emitting device 300, comprise substrate 303, on substrate 303, dispose in regular turn anode 304, first organic electroluminescence cell 1, second organic electroluminescence cell 2 ..., N organic electroluminescence cell N, and negative electrode 320, have connection electrode 318 between the wherein in office two adjacent organic electroluminescence cells.In other words, tandem el light emitting device 300 has (N-1) individual connection electrode 318.It should be noted that, when the tandem el light emitting device comprises N (N is greater than 2) organic electroluminescence cell, the luminescent layer that first organic electroluminescence cell 1 (organic electroluminescence cell of the most close anode 304) is comprised can be identical with the luminescent layer of N organic electroluminescence cell N (organic electroluminescence cell of the most close negative electrode 320), but the putting in order of N organic electroluminescence cell N luminescent layer (being come by the anode-side number) can be opposite with putting in order of first organic electroluminescence cell, 1 luminescent layer.For instance: the luminescent layer of first organic electroluminescence cell 1 is comprised in regular turn by the anode-side number: luminescent layer 310.1, luminescent layer 312.1, and the luminescent layer of luminescent layer 314.1, the N organic electroluminescence cell N come then to comprise in regular turn by the anode-side number: luminescent layer 314.N, luminescent layer 312.N, and luminescent layer 310.N.In addition, other organic electroluminescence cells between first organic electroluminescence cell 1 and N organic electroluminescence cell N, the number of its luminescent layer, composition or order are also unrestricted, can be known any organic electroluminescence cell.
In sum, the invention provides the tandem el light emitting device and comprise its image display system, this tandem el light emitting device comprises a plurality of organic electroluminescence cells, because each organic electroluminescence cell can comprise red, blue, green luminescent layer respectively, therefore can reach the purpose of full-colorization.In addition, compared to the prior art, each organic electroluminescence cell of conventional tandem el light emitting device has identical luminescent layer, and it is identical to put in order, the photochromic meeting that causes whole el light emitting device to send thus changes along with the drive current size, can't send single photochromic continually and steadily.And be different from known technology, according to tandem el light emitting device of the present invention, have N organic electroluminescence cell, and the N organic electroluminescence cell comprises the luminescent layer of first organic electroluminescence cell, but luminescent layer puts in order on the contrary.Thus, the el light emitting device of gained sent photochromicly can not change along with the drive current size, can reach and keep photochromic stable purpose.
Fig. 8 shows image display system block schematic diagram according to another embodiment of the present invention, it may be implemented in display unit 400 or electronic installation 500, for example notebook computer, mobile phone, digital camera, personal digital assistant, desktop computer, television set, automobile-used display or portable type digital audio-video optical disc player.Can be arranged at display unit 400 according to tandem el light emitting device 100 of the present invention (for example composite colour organic electroluminescent device shown in Fig. 1-4), and display unit 400 can be the composite colour organic electroluminescent display.In other embodiments, display unit 400 can be arranged in the electronic installation 500.As shown in Figure 8, electronic installation 500 comprises: display unit 400 and input unit 450.Input unit 450 is coupled to type flat panel display apparatus 400, in order to provide input signal (for example, signal of video signal) to display unit 400 to produce image.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those of ordinary skill in the technical field under any; without departing from the spirit and scope of the present invention; when can doing to change and retouching, so protection scope of the present invention is when looking appended being as the criterion that claim defined.
Claims (18)
1. image display system comprises:
The tandem el light emitting device comprises:
First electrode;
First to the N organic electroluminescence cell, is disposed in regular turn on this first electrode, and wherein N is more than or equal to 2 and be integer;
Second electrode is disposed on this N organic electroluminescence cell; And
N-1 connection electrode, wherein each connection electrode is arranged between the wantonly two adjacent organic electroluminescence cells,
Wherein, this first organic electroluminescence cell comprises first luminescent layer and second luminescent layer in regular turn by this first electrode side, wherein this first luminescent layer has different physical quantitys with this second luminescent layer, and this N organic electroluminescence cell comprises the 3rd luminescent layer and the 4th luminescent layer in regular turn by this first electrode side, wherein the 3rd luminescent layer and the identical physical quantity of this second luminescent layer tool, the 4th luminescent layer and the identical physical quantity of this first luminescent layer tool.
2. image display system as claimed in claim 1, wherein this physical quantity is meant the emission wavelength of these luminescent layers.
3. image display system as claimed in claim 1, wherein this physical quantity is meant the electron mobility of these luminescent layers.
4. image display system as claimed in claim 1, wherein this physical quantity is meant the hole mobility of these luminescent layers.
5. image display system as claimed in claim 1, wherein this first luminescent layer and second luminescent layer are respectively and select in the group that freedom is red, green and blue light-emitting layer is formed.
6. image display system as claimed in claim 1, wherein this first and this second luminescent layer one of them comprises redness, green, and wherein two kinds of blue alloy at least.
7. image display system as claimed in claim 1, wherein this first organic electroluminescence cell also comprises barrier layer, is disposed between this first luminescent layer and this second luminescent layer.
8. image display system as claimed in claim 7, wherein this barrier layer comprises the double carriers material.
9. image display system as claimed in claim 1, wherein this first organic electroluminescence cell also comprises the 5th luminescent layer, is disposed on this second luminescent layer.
10. image display system as claimed in claim 9, wherein this first luminescent layer, this second luminescent layer have different physical quantitys with the 5th luminescent layer.
11. image display system as claimed in claim 9, wherein the 5th luminescent layer is to select in the group that freedom is red, green and blue light-emitting layer is formed.
12. image display system as claimed in claim 9, wherein this second organic electroluminescence cell also comprises the 6th luminescent layer, is disposed under the 3rd luminescent layer.
13. image display system as claimed in claim 12, wherein the 3rd luminescent layer, the 4th luminescent layer have different physical quantitys with the 6th luminescent layer.
14. image display system as claimed in claim 12, wherein the 5th has identical physical quantity with the 6th luminescent layer.
15. image display system as claimed in claim 9, wherein this first organic electroluminescence cell also comprises barrier layer, is disposed between this first luminescent layer and this second luminescent layer.
16. image display system as claimed in claim 9, wherein this first organic electroluminescence cell also comprises barrier layer, is disposed between this second luminescent layer and the 5th luminescent layer.
17. image display system as claimed in claim 1 also comprises display unit, this display unit comprises this tandem el light emitting device.
18. image display system as claimed in claim 17 also comprises:
Electronic installation, wherein this electronic installation comprises:
This display unit; And
Input unit couples with this display unit, wherein this input unit transmission signals to this display unit to produce image.
19 image display systems as claimed in claim 18, wherein this electronic installation is mobile phone, digital camera, personal digital assistant, notebook computer, desktop computer, TV, automobile-used display or portable type digital audio-video optical disc player.
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| CN200910136071.3A CN101872781B (en) | 2009-04-27 | 2009-04-27 | Image display system |
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| CN200910136071.3A CN101872781B (en) | 2009-04-27 | 2009-04-27 | Image display system |
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| CN109216416A (en) * | 2017-06-30 | 2019-01-15 | 乐金显示有限公司 | Organic Light Emitting Diode and display device including it |
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| JP2007502534A (en) * | 2003-08-12 | 2007-02-08 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Circuit arrangement for organic diode AC drive |
| JP4431379B2 (en) * | 2003-12-19 | 2010-03-10 | 東北パイオニア株式会社 | Organic EL device and method for forming the same |
| KR100670543B1 (en) * | 2003-12-29 | 2007-01-16 | 엘지.필립스 엘시디 주식회사 | Organic Electro luminescence Device |
| US7494722B2 (en) * | 2005-02-23 | 2009-02-24 | Eastman Kodak Company | Tandem OLED having an organic intermediate connector |
| CN101106180B (en) * | 2006-06-08 | 2011-03-16 | 奇美电子股份有限公司 | Image display system |
| JP2008108503A (en) * | 2006-10-24 | 2008-05-08 | Fuji Electric Holdings Co Ltd | Manufacturing method of white light emitting organic el element |
| CN100479183C (en) * | 2007-01-09 | 2009-04-15 | 友达光电股份有限公司 | Pixel structure and organic EL component |
| EP2031036B1 (en) * | 2007-08-31 | 2012-06-27 | Semiconductor Energy Laboratory Co., Ltd. | Light-emitting element, light-emitting device, and electronic appliance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109216416A (en) * | 2017-06-30 | 2019-01-15 | 乐金显示有限公司 | Organic Light Emitting Diode and display device including it |
| CN109216416B (en) * | 2017-06-30 | 2023-06-09 | 乐金显示有限公司 | Organic light emitting diode and display device including the same |
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