CN101257035A - Organic electroluminescence display device with top luminous - Google Patents
Organic electroluminescence display device with top luminous Download PDFInfo
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- CN101257035A CN101257035A CNA2007100796035A CN200710079603A CN101257035A CN 101257035 A CN101257035 A CN 101257035A CN A2007100796035 A CNA2007100796035 A CN A2007100796035A CN 200710079603 A CN200710079603 A CN 200710079603A CN 101257035 A CN101257035 A CN 101257035A
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Abstract
A top luminous organic electroluminescent luminous display unit includes: a substrate including a display zone; a conductive layer situated above the substrate, and is electrically connected with the substrate; a reflection layer situated at the display zone of the substrate; a dielectric layer situated above the conductive layer, the reflection layer and the substrate, wherein the dielectric layer has a contact window out from the conductive layer; a transparent electrode layer situated above the dielectric layer and electrically connected along the contact window and the conductive layer; and a organic electroluminescent luminous layer situated above the transparent electrode layer, and corresponding to the display zone.
Description
Technical field
The present invention is relevant for a kind of organic electroluminescence display device with top luminous, and is particularly to a kind of organic electroluminescence display device with top luminous that promotes luminous efficiency and photochromism.
Background technology
(be called its principle of luminosity of organic electroluminescent LED (organic light emitting diode, OLED) display) again is to apply an extra electric field at organic molecule material to make it produce luminescence phenomenon to display of organic electroluminescence (organic electroluminescent devices).Display of organic electroluminescence is because its self-luminosity (selfemission), but array shows (dot matrix type display), have frivolous, high contrast, low consumpting power, high-res, reaction time short (fast response time), do not need characteristics such as backlight and wide viewing angle, and its panel size can be by the large-scale billboards of 4mm miniscope to 100 cun, be regarded as the main flow of flat-panel screens of future generation, except the application of display, there is dynamo-electric light-emitting component more can on the material of frivolous deflection, form array architecture.
In the application of display, full-color is the necessary condition of market success, if distinguish according to the colorize mode, the display of organic electroluminescence structure mainly can be divided into three-colour light-emitting layer structure, color converting layer (colorchange media, CCM) and colorized optical filtering membrane structure (color filter, three kinds of modes such as CF), wherein three-colour light-emitting layer structure is present full-colorization of the display of organic electroluminescence mode of normal use, be with red, blue, the luminescent material of green three looks is coated in the pixel respectively, add different bias voltages producing full-color effect, and have the optimized advantage of luminous efficiency.
Summary of the invention
The object of the present invention is to provide a kind of organic electroluminescence display device with top luminous, in order to improving the problem that reflector oxidation in traditional organic electroluminescence display device with top luminous causes impedance, and improve luminous efficiency and photochromism by the thickness of adjusting dielectric layer.
For reaching above-mentioned purpose, the invention provides a kind of organic electroluminescence display device with top luminous, comprising: substrate comprises the viewing area; Conductive layer is positioned on this substrate, and is electrically connected with this substrate; The reflector is positioned on this viewing area of this substrate; Dielectric layer is positioned on this conductive layer, this reflector and this substrate, and wherein this dielectric layer has contact hole and exposes this conductive layer; Transparent electrode layer is positioned on this dielectric layer, and is electrically connected with this conductive layer along this contact hole; And organic electro luminescent layer, be positioned on this transparent electrode layer, and correspond to this viewing area.
For reaching above-mentioned purpose, the present invention also provides a kind of organic electroluminescence display device with top luminous, comprising: substrate comprises the inferior pixel region of a plurality of different colours; Conductive layer is positioned at those times pixel region on this substrate, and is electrically connected with this substrate; The reflector is positioned at those times pixel region on this substrate; Dielectric layer is positioned on this conductive layer, this reflector and this substrate, and wherein this dielectric layer has a contact hole and exposes this conductive layer, and this dielectric layer has different thickness at the inferior pixel region of those different colours; Transparent electrode layer is positioned on this dielectric layer and along this contact hole and is electrically connected with this conductive layer; And the organic electro luminescent layer of a plurality of different colours, be positioned on this transparent electrode layer, and correspond to those times pixel region.
Description of drawings
Fig. 1 shows the profile of a kind of organic electroluminescence display device with top luminous known for inventor;
Fig. 2 shows the profile of the organic electroluminescence display device with top luminous of one embodiment of the invention;
Fig. 3 shows the profile of the organic electroluminescence display device with top luminous of another embodiment of the present invention;
Fig. 4 shows the profile of the organic electroluminescence display device with top luminous of further embodiment of this invention.
The main element symbol description
Display of organic electroluminescence～100,200,300,400; Active element substrate～101,201,301; Conductive layer～103,203,303; Protective layer～401; Reflector～109,205,305,405; Dielectric layer～105,207,307; Contact hole～107,209,309,409; Transparent electrode layer～111,211,311; Organic electro luminescent layer～113,213; Organic electroluminescence red light luminescent layer～313R; Organic electroluminescence green luminescence layer～313G; Blue organic electroluminescence luminescent layer～313B; Viewing area～112,212; Red time pixel region～300R; Green time pixel region～300G; Blue sub-pixels district～300B; Pixel defining layer～115,215,315
Embodiment
Fig. 1 shows a kind of organic electroluminescence display device with top luminous known for inventor, and structure that it should be noted that Fig. 1 is not a known technology, and just is used for illustrating the problem that the inventor is found on technology.
Organic electroluminescence display device with top luminous 100 as shown in Figure 1 comprises an active element substrate 101, wherein has a plurality of driving element (not shown)s.Have conductive layer 103 on active element substrate, be used as the contact of source/drain in organic light-emitting display device picture element electrode and the active element substrate 101, its material for example is copper or aluminium.Be formed with a dielectric layer 105 on active element substrate 101 and conductive layer 103, it has the top surface of a contact hole 107 and exposed portions serve conductive layer 103.In dielectric layer 105, the conductive layer 103 that exposes and contact hole 107, be formed with a reflector 109, be generally metal material, be used for reflecting exciting light to increase the luminous efficiency of organic electroluminescence display device with top luminous 100.On reflector 109, be formed with a transparent electrode layer 111, be generally tin indium oxide,, and see through conductive layer 103 and be electrically connected with active element substrate 101 as the pixel electrode of display of organic electroluminescence 100.Be formed with organic electro luminescent layer 113 on transparent electrode layer 111, and around organic electro luminescent layer 113, also comprise pixel defining layer (pixel definition layer) 115, in order to define viewing area 112.
Organic electroluminescence display device with top luminous 100 as shown in Figure 1, wherein with the high metal level of reflectivity (reflector 109) as the display bottom reflection formula structure luminous efficiency that gains, but on the interface of 111 of metal level and transparent electrode layers, can its resistance be risen, and reduce the luminous efficiency of display of organic electroluminescence 100.In addition, because reflector 109 next-door neighbour's transparent electrode layers 111, therefore, effectively the light path of the light that excited of modulation organic electro luminescent layer 113 is with the luminous efficiency and the colourity of raising display.
In order to solve the problem of above-mentioned resistance and luminous efficiency, the present invention proposes a kind of organic electroluminescence display device with top luminous, by the formation position of adjusting the reflector and the thickness of dielectric layer, to reduce resistance and effective high-luminous-efficiency and colourity.
Fig. 2 shows the organic electroluminescence display device with top luminous 200 of one embodiment of the invention, comprises a substrate (for example active element substrate) 201, wherein has a plurality of driving element (not shown)s.Have conductive layer 203 and reflector 205 on active element substrate 201, wherein conductive layer 203 can be copper or aluminium, be used as source/drain in organic light-emitting display device picture element electrode and the active element substrate 201 contact.And reflector 205 generally is preferably aluminium or silver, and it is arranged in viewing area 212 and is used for reflecting the light that organic electro luminescent layer excites, to increase the luminous efficiency of display.Conductive layer 203 can be with layer structure with reflector 205, can make reflector 205 simultaneously when forming conductive layer 203, and both can be same material or different materials.Though conductive layer 203 and reflector 205 do not link to each other in the diagram, in another embodiment, conductive layer 203 and reflector 205 can be with layer and continuous structure.
Be formed with a dielectric layer 207 on active element substrate 201, conductive layer 203 and reflector 205, its material for example is the combination of silica, silicon nitride or above-mentioned material.Dielectric layer 207 has the top surface of a contact hole 209 exposed portions serve conductive layers 203.In dielectric layer 207, the conductive layer 203 that exposes and contact hole 209, be formed with a transparent electrode layer 211, for example be indium tin oxide (indium tin oxide, ITO), indium-zinc oxide (indium zinc oxide, IZO), cadmium tin-oxide (cadmium tin oxide, CTO), metal azo (metallized AZO), zinc oxide (zinc oxide, ZnO), indium nitride (indiumnitride, InN) or tin oxide (stannum dioxide, SnO
2), as the pixel electrode of display of organic electroluminescence 200, and see through conductive layer 203 and be electrically connected with source/drain in the active element substrate 201.On transparent electrode layer 211, be formed with organic electro luminescent layer 213 in the viewing area 212 and correspond to reflector 205 below the dielectric layer 207, wherein the material of organic electro luminescent layer 213 can be micromolecule or high molecular fluorescence or phosphor material, though only show one deck in the diagram, should understand and except luminescent layer, also comprise hole injection layer, hole transmission layer, electron injecting layer and electron transfer layer but be familiar with this operator, for simplicity of illustration will not illustrate at this.Around organic electro luminescent layer 213, also comprise pixel defining layer (pixel definition layer) 215, in order to define viewing area 212.Except said structure, on organic electro luminescent layer, be formed with top electrode, protective layer and transparent upper (not shown) successively.
Can learn by Fig. 2, after in dielectric layer 207, forming contact hole 209, and then in contact hole 209, form transparent electrode layer 211 on the conductive layer 203 and on the dielectric layer 207, but not as shown in Figure 1, form transparent electrode layer 111 again after forming reflector 109 earlier in contact hole 107, on the conductive layer 103 and on the dielectric layer 105.Therefore, in embodiments of the present invention, in contact hole 209, can avoid the problem that causes resistance to rise because of the metal oxide that is generated on metallic reflector and the transparent electrode layer interface.In addition, compared to organic electroluminescence display device with top luminous shown in Figure 1, the reflector 205 of the embodiment of the invention is formed in the viewing area 212 and under the dielectric layer 207, dielectric layer 207 can be used as micro-cavity layer, makes light produce microcavity effect in dielectric layer 207.Because transparent electrode layer 211 and 205 in reflector are separated with a dielectric layer 207 in the viewing area 212, therefore, the light path of the light that organic electro luminescent layer 213 excites downwards is through carrying out modulation by the dielectric layer 207 of deposition different-thickness, to see through luminous efficiency and the photochromism that microcavity effect improves display 200.
Fig. 3 shows the organic electroluminescence display device with top luminous 400 of another embodiment of the present invention, and wherein identical with Fig. 2 label person represents components identical, does not repeat them here.Fig. 3 embodiment and Fig. 2 embodiment difference are that a protective layer (passiviationlayer) 401 is arranged between conductive layer 203 and the dielectric layer 207.That is, after conductive layer 203 forms, forming a protective layer 401 earlier, protective layer 401 can be the combination of silica, silicon nitride or above-mentioned material.Then, on the relative position of viewing area 212, on protective layer 401, form a reflector 405.Then, on conductive layer 203, protective layer 401 and reflector 405, form a dielectric layer 207.Then, in dielectric layer 207 and protective layer 401, form a contact hole 409, to expose conductive layer 203.In this embodiment, conductive layer 203 and reflector 205 be at different layers, and can be same material or different materials.
Continuation is with reference to figure 3, identical with Fig. 2, then, form transparent electrode layer 211 in contact hole 409, on the conductive layer 203 and on the dielectric layer 207, but not as shown in Figure 1, form transparent electrode layer 111 again after forming reflector 109 earlier in contact hole 107, on the conductive layer 103 and on the dielectric layer 105.Therefore, in embodiments of the present invention, in contact hole 409, can avoid the problem that causes resistance to rise because of the metal oxide that is generated on metallic reflector and the transparent electrode layer interface.In addition, compared to organic electroluminescence display device with top luminous shown in Figure 1, the reflector 405 of the embodiment of the invention is formed in the viewing area 212 and under the dielectric layer 207, dielectric layer 207 can be used as micro-cavity layer, makes light produce microcavity effect in dielectric layer 207.Because transparent electrode layer 211 and 205 in reflector are separated with a dielectric layer 207 in the viewing area 212, therefore, the light path of the light that organic electro luminescent layer 213 excites downwards is through carrying out modulation by the dielectric layer 207 of deposition different-thickness, to see through luminous efficiency and the photochromism that microcavity effect improves display 400.
Fig. 4 shows further embodiment of this invention, and the thickness difference of dielectric layer in each time pixel region wherein is by adjusting in the pixel thickness of dielectric layer in each time pixel region, with the luminous efficiency and the photochromism of lifting display.Fig. 4 shows the profile of organic electroluminescence display device with top luminous 300 of the present invention, comprises red time pixel region 300R, green time pixel region 300G and blue sub-pixels district 300B, and the cross-section structure of each time pixel region is roughly as shown in Figure 2.With red time pixel region 300R is example, red time pixel region comprises an active element substrate 301, be formed with a conductive layer 303 and reflector 305 on it, wherein conductive layer 303 can be copper or aluminium, is used as the contact of source/drain in organic light-emitting display device picture element electrode and the active element substrate 301.And reflector 305 generally is preferably aluminium or silver, is arranged in red time pixel region 300R and is used for reflecting the light that luminescent layer excites downwards, to increase the luminous efficiency of display.In addition, conductive layer 303 can be same material or different materials with reflector 305, and both can be with layer, can make reflector 305 when forming conductive layer 303 simultaneously.Though conductive layer 303 and reflector 305 do not link to each other in the diagram, conductive layer 303 and reflector 305 can be with layer and continuous structure in another embodiment.Perhaps, conductive layer 303 can be different layers (as shown in Figure 3, conductive layer 203 and reflector 405 are different layers) with reflector 305.
Be formed with a dielectric layer 307 on active element substrate 301, conductive layer 303 and reflector 305, its material for example is the combination of silica, silicon nitride or above-mentioned material.Dielectric layer 307 has the top surface that a contact hole 309 exposes conductive layer 303.In dielectric layer 307, the conductive layer 303 that exposes and contact hole 309, be formed with a transparent electrode layer 311, for example be indium tin oxide (indium tin oxide, ITO), indium-zinc oxide (indium zinc oxide, IZO), cadmium tin-oxide (cadmium tin oxide, CTO), metal azo (metallized AZO), zinc oxide (zinc oxide, ZnO), indium nitride (indiumnitride, InN) or tin oxide (stannum dioxide, SnO
2), as the pixel electrode of display of organic electroluminescence 300, and see through conductive layer 303 and be electrically connected with source/drain in the active element substrate 301.On transparent electrode layer 311, be formed with organic electroluminescence red light luminescent layer 313R among the red time pixel region 300R, and correspond to the reflector 305 of dielectric layer 307 belows, around organic electro luminescent layer 313R, also comprise pixel defining layer (pixel definition layer) 315, in order to define red time pixel region 300R.Except said structure, on organic electro luminescent layer, be formed with top electrode, protective layer and transparent upper (not shown) successively.
As shown in Figure 4, pixel defining layer 315 defines red time pixel region 300R, green time pixel region 300G and blue sub-pixels district 300B.On transparent electrode layer 311, in redness, green, blue sub-pixels district 300R, 300G, 300B, form organic electroluminescence red light luminescent layer 313R, organic electroluminescence green luminescence layer 313G and blue organic electroluminescence luminescent layer 313B respectively.Can make exciting light in dielectric layer, produce microcavity effect (microcavity), to promote the luminous efficiency and the colourity of display according to the thickness of dielectric layer in photochromic each time of modulation pixel that dynamo-electric luminescent layer is arranged of each time pixel.According to the embodiment of the invention, with Fig. 4 is example, dielectric layer 307 thickness in the red time pixel region 300R can be adjusted into maximum, dielectric layer 307 thickness in the green time pixel region 300G take second place, and dielectric layer 307 thickness in the blue sub-pixels district 300B can be adjusted to minimum.
Can learn by the embodiment of the invention, the formation position of metallic reflector is moved to the dielectric layer below, the resistance problems that not only can avoid the generation of metallic reflector and transparency electrode interlayer metal oxide and produce, simultaneously, also can reach optical path difference control by the thickness of adjusting reflector and luminous interlayer dielectric layer, make exciting light in dielectric layer, produce microcavity effect, to promote the adjustment on catoptrical gain and the colourity.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.
Claims (10)
1. an organic electroluminescence display device with top luminous comprises;
Substrate comprises the viewing area;
Conductive layer is positioned on this substrate, and is electrically connected with this substrate;
The reflector is positioned on this viewing area of this substrate;
Dielectric layer is positioned on this conductive layer, this reflector and this substrate, and wherein this dielectric layer has contact hole to expose this conductive layer;
Transparent electrode layer is positioned on this dielectric layer, and is electrically connected with this conductive layer along this contact hole; And
Organic electro luminescent layer is positioned on this transparent electrode layer, and corresponds to this viewing area.
2. organic electroluminescence display device with top luminous as claimed in claim 1, wherein this reflector and this conductive layer are with layer.
3. organic electroluminescence display device with top luminous as claimed in claim 1, wherein this reflector and this conductive layer are different layers.
4. organic electroluminescence display device with top luminous as claimed in claim 3 also comprises:
Protective layer is positioned on this substrate, under this reflector and this dielectric layer, makes this contact hole be formed within this protective layer and this dielectric layer.
5. organic electroluminescence display device with top luminous comprises:
Substrate comprises the inferior pixel region of a plurality of different colours;
Conductive layer is positioned at those times pixel region on this substrate, and is electrically connected with this substrate;
The reflector is positioned at those times pixel region on this substrate;
Dielectric layer is positioned on this conductive layer, this reflector and this substrate, and wherein this dielectric layer has contact hole and exposes this conductive layer, and this dielectric layer has different thickness at the inferior pixel region of those different colours;
Transparent electrode layer is positioned on this dielectric layer and along this contact hole and is electrically connected with this conductive layer; And
The organic electro luminescent layer of a plurality of different colours is positioned on this transparent electrode layer, and corresponds to those times pixel region.
6. organic electroluminescence display device with top luminous as claimed in claim 5, wherein this time pixel region comprises: red time pixel region, green time pixel region and blue sub-pixels district; This dielectric layer in the thickness of this redness time pixel region greater than the thickness of this dielectric layer, and greater than the thickness of this dielectric layer in the blue sub-pixels district in green time pixel region.
7. organic electroluminescence display device with top luminous as claimed in claim 6, wherein this dielectric layer in the thickness of this green time pixel region greater than the thickness of this dielectric layer in the blue sub-pixels district.
8. organic electroluminescence display device with top luminous as claimed in claim 5, wherein this reflector and this conductive layer are with layer.
9. organic electroluminescence display device with top luminous as claimed in claim 6, wherein this reflector and this conductive layer are different layers.
10. organic electroluminescence display device with top luminous as claimed in claim 9 also comprises:
Protective layer is positioned on this substrate, under this reflector and this dielectric layer, makes this contact hole be formed within this protective layer and this dielectric layer.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103545449A (en) * | 2012-07-10 | 2014-01-29 | 群康科技(深圳)有限公司 | Organic light emitting diode (OLED), display panel with OLED and display equipment with OLED |
| CN103715220A (en) * | 2012-10-05 | 2014-04-09 | 三星显示有限公司 | Organic light emitting diode display and manufacturing method thereof |
| CN104409654A (en) * | 2014-11-19 | 2015-03-11 | 昆山工研院新型平板显示技术中心有限公司 | Light-emitting device and manufacturing method thereof |
| CN105633290A (en) * | 2015-12-31 | 2016-06-01 | 昆山国显光电有限公司 | OLED device and manufacturing method thereof |
| CN110752316A (en) * | 2019-11-08 | 2020-02-04 | 深圳市华星光电半导体显示技术有限公司 | Organic display panel and electronic device |
| CN111628102A (en) * | 2020-05-18 | 2020-09-04 | 武汉华星光电半导体显示技术有限公司 | Microcavity electrode structure and organic electroluminescent device |
| CN111704623A (en) * | 2020-06-10 | 2020-09-25 | 山西大学 | Organic electroluminescent red light material and preparation method and application thereof |
| WO2021027133A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
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| KR100623252B1 (en) * | 2004-04-07 | 2006-09-18 | 삼성에스디아이 주식회사 | Top-emission organic electroluminescent display and fabrication method of the same |
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| CN103545449A (en) * | 2012-07-10 | 2014-01-29 | 群康科技(深圳)有限公司 | Organic light emitting diode (OLED), display panel with OLED and display equipment with OLED |
| CN103715220A (en) * | 2012-10-05 | 2014-04-09 | 三星显示有限公司 | Organic light emitting diode display and manufacturing method thereof |
| CN103715220B (en) * | 2012-10-05 | 2018-04-03 | 三星显示有限公司 | Organic light emitting diode display and its manufacture method |
| CN104409654A (en) * | 2014-11-19 | 2015-03-11 | 昆山工研院新型平板显示技术中心有限公司 | Light-emitting device and manufacturing method thereof |
| CN105633290A (en) * | 2015-12-31 | 2016-06-01 | 昆山国显光电有限公司 | OLED device and manufacturing method thereof |
| WO2021027133A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市华星光电半导体显示技术有限公司 | Display panel |
| CN110752316A (en) * | 2019-11-08 | 2020-02-04 | 深圳市华星光电半导体显示技术有限公司 | Organic display panel and electronic device |
| CN110752316B (en) * | 2019-11-08 | 2022-08-05 | 深圳市华星光电半导体显示技术有限公司 | Organic display panel and electronic device |
| CN111628102A (en) * | 2020-05-18 | 2020-09-04 | 武汉华星光电半导体显示技术有限公司 | Microcavity electrode structure and organic electroluminescent device |
| CN111704623A (en) * | 2020-06-10 | 2020-09-25 | 山西大学 | Organic electroluminescent red light material and preparation method and application thereof |
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| CN101257035B (en) | 2012-07-18 |
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