CN204179111U - A kind of top emitting white light OLED device and display unit - Google Patents
A kind of top emitting white light OLED device and display unit Download PDFInfo
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- CN204179111U CN204179111U CN201420677676.XU CN201420677676U CN204179111U CN 204179111 U CN204179111 U CN 204179111U CN 201420677676 U CN201420677676 U CN 201420677676U CN 204179111 U CN204179111 U CN 204179111U
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Abstract
The utility model provides a kind of top emitting white light OLED device and display unit, this OLED comprises the multiple pixel cells be positioned on substrate, each pixel cell is away from described orientation substrate comprising the first electrode layer, organic layer and the second electrode lay that set gradually, wherein, the chamber that described organic layer in pixel cell described in each has gradual change is long, the chamber of described gradual change is long corresponding from ruddiness to blue wavelength range respectively, and the white light making described pixel cell corresponding strengthens.Adopt scheme of the present utility model, the light-out effect of top emitting white light OLED device can be improved, obvious intensity can not occur when larger observation visual angle and decline and photochromic change.
Description
Technical field
The utility model include organic electroluminescence devices (Organic Light-Emitting Diode, hereinafter referred to as: OLED) Display Technique field, particularly relates to a kind of top emitting white light OLED device and display unit.
Background technology
OLED because of possess active illuminating, good temp characteristic, power consumption little, respond fast, flexible, ultra-thin and low cost and other advantages, and be referred to as third generation illusion Display Technique.At present, under the promotion that global manufacturer continues fund input and technical research, OLED flat panel display is just trending towards that volume production technology is increasingly mature to grow at top speed the stage with the market demand.
OLED is mainly divided into two kinds according to light direction, that is: bottom emitting OLED and top emitting OLED.Bottom emitting OLED refers to the OLED that light penetrates from orientation substrate, and top emitting OLED refers to the OLED that light penetrates from top device direction.Wherein, top emitting OLED, because of not by the impact of substrate whether printing opacity, effectively can improve the aperture opening ratio of display floater, expand the design of TFT circuit on substrate, enrich the selection of electrode material, is conducive to the integrated of device and TFT circuit.
Although top emitting OLED has can improve device efficiency, spectrum and the raising colorimetric purity etc. of narrowing advantage, it often has stronger microcavity effect.Microcavity effect can make the electroluminescent spectrum of OLED change with observation angle change, and with great visual angle time, efficiency obviously declines, and namely causes OLED to occur observation angle dependency problem.And these problems are very large shortcomings for high-precision flat panel display.
Utility model content
In view of this, the utility model provides a kind of top emitting white light OLED device and display unit, causes to solve existing top emitting white light OLED device the problem changing light-out effect difference with viewing angle due to microcavity effect.
For solving the problems of the technologies described above, the utility model provides a kind of top emitting white light OLED device, comprising:
Be positioned at the multiple pixel cells on substrate, pixel cell described in each comprises edge away from the first electrode layer, organic layer and the second electrode lay that described orientation substrate sets gradually, the chamber that described organic layer in pixel cell described in each has gradual change is long, the chamber of described gradual change is long corresponding from ruddiness to blue wavelength range respectively, and the white light making described pixel cell corresponding strengthens.
Preferably, described first electrode layer has periodic undulations shape structure towards the interface of described organic layer.
Preferably, described periodic undulations shape structure is lattice structure, and described lattice structure comprises the salient point of multiple continuous setting, or comprises multiple spaced salient point and pit.
Preferably, the paddy peak heights of described salient point is positioned at the difference range of optical cavity length corresponding to visible wavelength change, and the paddy peak gap length of described salient point is less than or equal to the width of described pixel cell.
Preferably, the paddy peak heights of described salient point is in 20-150 nanometer range, and the paddy peak gap length of described salient point is in 1-10 micrometer range.
Preferably, described salient point is hemispherical or the hemispherical salient point of class, and described pit is hemispherical or the hemispherical pit of class.
Preferably, described top emitting white light OLED device also comprises: resin bed, is positioned under described first electrode layer, and described resin bed has the periodic undulations shape structure identical with described first electrode layer towards the interface of described first electrode layer.
Preferably, described organic layer fills and leads up the periodic undulations shape structure of described first electrode layer at least partly or all, long to make the described organic layer in described pixel cell have the chamber of gradual change.
Preferably, described first electrode layer is reflecting electrode, and described the second electrode lay is translucent half reflection electrode.
The utility model also provides a kind of display unit, comprises above-mentioned top emitting white light OLED device.
The beneficial effect of technique scheme of the present utility model is as follows:
In top emitting white light OLED device, the chamber that organic layer in one pixel cell has gradual change is long, the chamber of this gradual change is long corresponding from ruddiness to blue wavelength range respectively, it is long that the microcavity making the diverse location of organic layer corresponding different strengthens chamber, thus make the white light emission that described pixel cell can be enhanced.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing top emitting white light OLED device;
Fig. 2 is the structural representation of the top emitting white light OLED device of the utility model embodiment one;
Fig. 3 is the enhancing bright dipping principle schematic of the top emitting white light OLED device in Fig. 2;
Fig. 4 is the structural representation of the top emitting white light OLED device of the utility model embodiment two;
Fig. 5 is the vertical view at the resin bed top of the utility model embodiment;
Fig. 6 is the profile of the resin bed of the utility model embodiment;
Fig. 7 is the enhancing bright dipping principle schematic of the top emitting white light OLED device in Fig. 4;
Fig. 8 is the structural representation of the top emitting white light OLED device of the utility model embodiment three;
Fig. 9 is the structural representation of the top emitting white light OLED device of the utility model embodiment four.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Please refer to Fig. 1, Fig. 1 is the structural representation of existing top emitting white light OLED device, and this OLED comprises: glass substrate 101, TFT functional layer and planarization layer 102, first electrode layer 103, organic layer 104, the second electrode lay 105, and pixel defining layer 106.In figure, arrow direction is light exit direction.
As can be seen from Figure 1, the chamber length of the organic layer 104 in one pixel cell is all identical on diverse location, due to microcavity effect, a kind of visible ray of optimal wavelength is only had to be enhanced bright dipping, the visible ray of other wavelength is then filtered, this is when causing larger observation visual angle, the reason that light intensity declines.
The problem changing light-out effect difference with viewing angle is caused due to microcavity effect for solving existing top emitting white light OLED device, the utility model embodiment provides a kind of top emitting white light OLED device, comprise the multiple pixel cells be positioned on substrate, pixel cell described in each comprises edge away from the first electrode layer that described orientation substrate sets gradually, organic layer and the second electrode lay, described organic layer in pixel cell described in each has the chamber long (i.e. thickness) of gradual change, the chamber of described gradual change is long corresponding from ruddiness to blue wavelength range respectively, thus the white light making described pixel cell corresponding strengthens.
In the utility model embodiment, the chamber due to the organic layer in a pixel cell with gradual change is long, the chamber of this gradual change is long corresponding from ruddiness to blue wavelength range respectively, it is long that the microcavity making the diverse location of organic layer corresponding different strengthens chamber, thus make the white light emission that described pixel cell can be enhanced.
In the utility model embodiment, the first electrode layer is hearth electrode, and usually used as anode, the second electrode lay is top electrode, usually used as negative electrode.Described first electrode layer is reflecting electrode, and its material can be a kind of or their alloy in gold, silver, aluminium.The second electrode lay is the electrode of translucent half reflection, and its material can be gold, silver, or their alloys.
The top emitting white light OLED device of the utility model embodiment can be various structures.Below citing is described.
Embodiment one
See Fig. 2, Fig. 2 is the structural representation of the top emitting white light OLED device of the utility model embodiment one, described top emitting white light OLED device comprises: substrate 200, be formed at the first electrode layer 201 on described substrate 200, be positioned at the organic layer 202 on described first electrode layer 201, and the second electrode lay 203 be positioned on described organic layer 202, wherein, described first electrode layer 201 is periodic undulations shape structure towards the interface of described organic layer 202.This concrete periodic undulations shape structure is lattice structure, and described lattice structure comprises the salient point 2011 of multiple continuous setting.
Wherein, described substrate 200 can comprise underlay substrate, TFT functional layer and planarization layer.
A part for a pixel cell is only shown in Fig. 2.
Please refer to Fig. 3, Fig. 3 is the enhancing bright dipping principle schematic of the top emitting white light OLED device in Fig. 2.As can be seen from the figure, the thickness of the diverse location of organic layer 202 in a pixel cell is different, wavelength due to red visible is about 630 ~ 780 nanometers, the wavelength of blue visible light is about 420 ~ 470 nanometers, thus organic layer part 2021 chamber that red visible is corresponding is long the longest, and the chamber of the organic layer part 2023 that blue visible light is corresponding is long the shortest.In figure, 2022 is the organic layer part that the visible ray of other colors is corresponding.
Preferably, the paddy peak heights a1 of described salient point 2011 is positioned at the difference range of optical cavity length corresponding to visible wavelength excursion, and the paddy peak gap length b1 (i.e. the fluctuating cycle at paddy peak) of described salient point 2011 is less than or equal to the width of described pixel cell.
Strengthen to effectively reach white light, preferably, the paddy peak heights of described salient point 2011 is in 20-150 nanometer range, and the paddy peak gap length of described salient point 2011 is in 1-10 micrometer range.
In the utility model embodiment, described organic layer 202 can comprise sandwich construction, as comprised: hole injection layer (HIL), hole transmission layer, luminescent layer, charge generation layer, articulamentum, electron transfer layer, electron injecting layer, hole blocking layer, the multilayer in electronic barrier layer etc., wherein, at least one deck (as hole injection layer) in described organic layer 202, there is wider thickness and regulate tolerance, to fill and lead up the fluctuating interface of described first electrode layer at least partly or all, make the organic layer in each pixel cell have the chamber of gradual change long.
Preferably, the salient point 2011 in the utility model embodiment is hemispherical or the hemispherical salient point of class, and certainly, in other embodiments of the present utility model, salient point 2011 also can be the salient point of other shapes.
Fig. 1 please be refer again to, because the thickness (chamber is long) of organic layer 104 corresponding to pixel cell is all identical on diverse location, when observing with great visual angle, when the chamber length of actual light path process is observed with front, the chamber appearance of light path process is than elongated, and this causes colour cast to occur.
In the utility model embodiment, because the lattice structure of the first electrode layer 201 has curved-surface structure, make
The optical cavity length of diverse location reflection is also just meeting the gradual change spectrum of white light OLED device, even if when larger observation visual angle, still can guarantee that pixel diverse location has approximately equalised chamber long, therefore, colour cast effect also weakens greatly, and intensity also can not obviously decline simultaneously.
Embodiment two
Refer to Fig. 4, Fig. 4 is the structural representation of the top emitting white light OLED device of the utility model embodiment two, described OLED comprises: substrate 200, be formed at the resin bed 204 on described substrate 200, be positioned at the first electrode layer 201 on described resin bed, be positioned at the organic layer 202 on described first electrode layer 201, and the second electrode lay 203 be positioned on described organic layer 202, wherein, described resin bed 204 is positioned under described first electrode layer 201, described resin bed 204 has the periodic undulations shape structure identical with described first electrode layer 201 towards the interface of described first electrode layer 201.
Wherein, described substrate 200 can comprise underlay substrate, TFT functional layer and planarization layer.
Because first electrode layer 201 with reflection function is made up of metal material usually, and it is more difficult to form separately the technique with the first electrode layer 201 of lattice structure on substrate 200, thus, in the utility model embodiment, first can form the resin bed 204 that has lattice structure on substrate 200, for being the first electrode layer 201 moulding, then, the resin bed 204 with lattice structure forms first electrode layer 201 with identical lattice structure, to reduce technology difficulty.
Described resin bed 204 can be made up of materials such as PI (polyimides).Certainly, this resin bed 204 for moulding is not limited only to resin material, and the other materials of easy moulding also can be adopted to be formed.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the vertical view at the resin bed top of the utility model embodiment, and Fig. 6 is the profile of the resin bed of the utility model embodiment.
Please refer to Fig. 7, Fig. 7 is the enhancing bright dipping principle schematic of the top emitting white light OLED device in Fig. 4, as can be seen from the figure, the thickness of the diverse location of organic layer 202 in a pixel cell is different, wavelength due to red visible is about 630 ~ 780 nanometers, the wavelength of blue visible light is about 420 ~ 470 nanometers, and organic layer part 2021 chamber that thus red visible is corresponding is long the longest, and the chamber of the organic layer part 2023 that blue visible light is corresponding is long the shortest.In figure, 2022 is the organic layer part that the visible ray of other colors is corresponding.
Preferably, the paddy peak heights a2 of described salient point 2011 is positioned at the difference range of optical cavity length corresponding to visible wavelength excursion, and the paddy peak gap length b2 (i.e. the fluctuating cycle at paddy peak) of described salient point 2011 is less than or equal to the width of described pixel cell.
Strengthen to effectively reach white light, preferably, the paddy peak heights of described salient point 2011 is in 20-150 nanometer range, and the paddy peak gap length of described salient point 2011 is in 1-10 micrometer range.
In the utility model embodiment, described organic layer 202 can comprise sandwich construction, as comprised: hole injection layer (HIL), hole transmission layer, luminescent layer, charge generation layer, articulamentum, electron transfer layer, electron injecting layer, hole blocking layer, the multilayer in electronic barrier layer etc., wherein, at least one deck (as hole injection layer) in described organic layer 202, there is wider thickness and regulate tolerance, to fill and lead up the fluctuating interface of described first electrode layer at least partly or all, make the organic layer in each pixel cell have the chamber of gradual change long.
In the utility model embodiment, due to technological reason, organic layer 202 is difficult to be filled and led up at the fluctuating interface of the first electrode layer completely, and just part is filled and led up, and the second electrode lay 203 therefore on organic layer 202 keeps level of approximation.
Preferably, the salient point 2011 in the utility model embodiment is hemispherical or the hemispherical salient point of class.Certainly, in other embodiments of the present utility model, salient point 2011 also can be the salient point of other shapes.
Embodiment three
Refer to Fig. 8, Fig. 8 is the structural representation of the top emitting white light OLED device of the utility model embodiment three, the present embodiment is compared with embodiment two, only have following difference: described lattice structure comprises multiple spaced salient point 2011 and pit 2012, its side pattern is the form of similar sine wave.
Preferably, the paddy peak heights a3 of described salient point 2011 is positioned at the difference range of optical cavity length corresponding to visible wavelength excursion, and the paddy peak gap length b3 (i.e. the fluctuating cycle at paddy peak) of described salient point 2011 is less than or equal to the width of described pixel cell.
Strengthen to effectively reach white light, preferably, the paddy peak heights of described salient point 2011 is in 20-150 nanometer range, and the paddy peak gap length of described salient point 2011 is in 1-10 micrometer range.
Preferably, the salient point 2011 in the utility model embodiment is hemispherical or the hemispherical salient point of class, and pit 2012 is hemispherical or the hemispherical pit of class.Certainly, in other embodiments of the present utility model, salient point 2011 and pit 2012 also can be other shapes, and as shown in Figure 9, Fig. 9 is the structural representation of the top emitting white light OLED device of the utility model embodiment four.
In above-described embodiment, by changing the shape of first electrode layer (hearth electrode) of top emitting white light OLED device, long to make organic layer in each pixel cell have different chambeies at diverse location, certainly, in other embodiments of the present utility model, also hearth electrode can be kept constant, change the shape of the second electrode lay (top electrode), namely at the second electrode lay, periodic undulations shape structure (as lattice structure) is set towards the interface of described organic layer, long to make the organic layer in each pixel cell have different chambeies at diverse location, or, also the thickness of organic layer itself can only be changed, the organic layer in each pixel cell is made to have different chambeies at diverse location long.
The OLED tool of above-described embodiment has the following advantages:
(1) effectively can strengthen the light-out effect of top emitting white light OLED device, and the problems such as the decline of obvious intensity and colour cast can not occur when larger observation visual angle.
(2) the utility model technique is simple, effectively can utilize the microcavity effect of speculum, while reaching the external quantum efficiency improving device, and reduces the dependence of angle of device, is especially suitable for use in large scale OLED display screen aspect.
The utility model embodiment also provides a kind of preparation method of OLED, be included in step substrate being formed multiple pixel cell, wherein, each pixel cell is along sequentially comprising the first electrode layer, organic layer and the second electrode lay away from described orientation substrate, the chamber that described organic layer in pixel cell described in each has gradual change is long, the chamber of described gradual change is long corresponding from ruddiness to blue wavelength range respectively, and the white light making described pixel cell corresponding strengthens.
Preferably, the preparation method of described OLED specifically comprises:
Step S11: form resin bed on substrate, the surface of described resin bed is lattice structure, and described lattice structure comprises the salient point of multiple continuous setting, or comprises multiple spaced salient point and pit;
Step S12: form the first electrode layer on described resin bed, the surface of described first electrode layer is the lattice structure identical with described resin bed;
Step S13: form organic layer on described first electrode layer, described organic layer can fill and lead up the contoured surface of described first electrode layer at least partly or all;
Step S14: form the second electrode lay on described organic layer.
Described substrate can comprise underlay substrate, TFT functional layer and planarization layer.
Described resin bed can adopt following two kinds of methods preparation:
Method one:
Adopt printing type to be coated on substrate the precursor ink forming resin, form uniform drop dot matrix, then remove the solvent in described drop dot matrix and cross-linked polymeric, after solidification, form the described resin bed with lattice structure.
Method two:
The mode applied is taked to form resin film on substrate; Utilize the mode of light shield mask to carry out exposure imaging to described resin film, form the resin bed with lattice structure.
The preparation method of the top emitting white light OLED device of the utility model embodiment comprises the following steps (structure of the OLED adopting the present embodiment to prepare refers to Fig. 4):
(1) printing type is adopted to be coated on planarization layer the precursor ink forming resin, form uniform drop dot matrix, then desolventizing is removed and cross-linked polymeric, the resin bed with the micro-nano lattice structure of one deck is formed after solidification, each resin point after solidification is hemispherical or class hemispherical configuration, the paddy peak heights difference of salient point between 20-150 nanometer, dot matrix be spaced apart 1-10 micron.
(2) deposition of first electrode layer on the resin layer, also i.e. hearth electrode, and keep the fluctuating pattern of resin bed.
(3) depositing organic successively on this first electrode layer, at least one deck wherein in organic layer, as hole injection layer, there is wider thickness and regulate tolerance, it partly can fill and lead up the fluctuating pattern of the first electrode layer, make the organic layer thickness between two electrode layers along with hearth electrode height fluctuations there is corresponding adjustment.The method forming organic layer has, wet coating, as spin coating, prints and dry method evaporation, or both combinations.Preferably wet method mode, it partly can fill and lead up sunk area preferably.
(4) on organic layer, deposit the second electrode lay, i.e. top electrode, and encapsulate.
Another preparation method of the top emitting white light OLED device of the utility model embodiment comprises (structure of the OLED adopting the present embodiment to prepare refers to Fig. 6):
(1) on planarization layer, the mode applied is taked to form resin bed, the mode of light shield mask is utilized to carry out exposure imaging to this resin bed, control exposure technology, form the lattice structure that hemispherical protuberances is alternate with bowl-like depression, the paddy peak heights difference of salient point is between 20-150 nanometer, and period distances is 1 to 10 microns.
(2) deposition of first electrode layer on the resin layer, also i.e. hearth electrode, and keep the fluctuating pattern of resin bed.
(3) depositing organic successively on this first electrode layer, at least one deck wherein in organic layer, as hole injection layer, there is wider thickness and regulate tolerance, it partly can fill and lead up the fluctuating pattern of the first electrode layer, make the organic layer thickness between two electrode layers along with hearth electrode height fluctuations there is corresponding adjustment.The method forming organic layer has, wet coating, as spin coating, prints and dry method evaporation, or both combinations.Preferably wet method mode, it partly can fill and lead up sunk area preferably.
(4) on organic layer, deposit the second electrode lay, i.e. top electrode, and encapsulate.
The utility model also provides a kind of display unit, comprises the top emitting white light OLED device that above-described embodiment provides.Described display unit can be: any product or parts with Presentation Function such as oled panel, mobile phone, panel computer, television set, display, notebook computer, DPF, navigator.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. a top emitting white light OLED device, comprise the multiple pixel cells be positioned on substrate, pixel cell described in each comprises edge away from the first electrode layer, organic layer and the second electrode lay that described orientation substrate sets gradually, it is characterized in that, the chamber that described organic layer in pixel cell described in each has gradual change is long, the chamber of described gradual change is long corresponding from ruddiness to blue wavelength range respectively, and the white light making described pixel cell corresponding strengthens.
2. top emitting white light OLED device according to claim 1, is characterized in that, described first electrode layer has periodic undulations shape structure towards the interface of described organic layer.
3. top emitting white light OLED device according to claim 2, is characterized in that, described periodic undulations shape structure is lattice structure, and described lattice structure comprises the salient point of multiple continuous setting, or comprises multiple spaced salient point and pit.
4. top emitting white light OLED device according to claim 3, it is characterized in that, the paddy peak heights of described salient point is positioned at the difference range of optical cavity length corresponding to visible wavelength change, and the paddy peak gap length of described salient point is less than or equal to the width of described pixel cell.
5. top emitting white light OLED device according to claim 4, is characterized in that, the paddy peak heights of described salient point is in 20-150 nanometer range, and the paddy peak gap length of described salient point is in 1-10 micrometer range.
6. top emitting white light OLED device according to claim 3, is characterized in that, described salient point is hemispherical or the hemispherical salient point of class, and described pit is hemispherical or the hemispherical pit of class.
7. top emitting white light OLED device according to claim 2, it is characterized in that, also comprise: resin bed, be positioned under described first electrode layer, described resin bed has the periodic undulations shape structure identical with described first electrode layer towards the interface of described first electrode layer.
8. top emitting white light OLED device according to claim 2, is characterized in that, described organic layer fills and leads up the periodic undulations shape structure of described first electrode layer at least partly or all, long to make the described organic layer in described pixel cell have the chamber of gradual change.
9. the top emitting white light OLED device according to any one of claim 1-8, is characterized in that, described first electrode layer is reflecting electrode, and described the second electrode lay is translucent half reflection electrode.
10. a display unit, is characterized in that, comprises the top emitting white light OLED device according to any one of claim 1-9.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319352A (en) * | 2014-11-13 | 2015-01-28 | 京东方科技集团股份有限公司 | Top emission white light OLED device, preparation method of top emission white light OLED device, and display device |
| CN107535025A (en) * | 2015-05-28 | 2018-01-02 | 株式会社神户制钢所 | Organic electronic device and organic electronic device substrate |
| US10002911B2 (en) | 2015-08-17 | 2018-06-19 | Boe Technology Group Co., Ltd. | Display back plate and fabricating method thereof and display device |
| US10553826B2 (en) | 2016-01-04 | 2020-02-04 | Boe Technology Group Co., Ltd. | Optical waveguide and manufacturing method thereof, display substrate and display device |
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2014
- 2014-11-13 CN CN201420677676.XU patent/CN204179111U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319352A (en) * | 2014-11-13 | 2015-01-28 | 京东方科技集团股份有限公司 | Top emission white light OLED device, preparation method of top emission white light OLED device, and display device |
| US10186675B2 (en) | 2014-11-13 | 2019-01-22 | Boe Technology Group Co., Ltd. | Top-emitting white organic light emitting diode device, method for manufacturing the same, and display apparatus |
| CN107535025A (en) * | 2015-05-28 | 2018-01-02 | 株式会社神户制钢所 | Organic electronic device and organic electronic device substrate |
| US10002911B2 (en) | 2015-08-17 | 2018-06-19 | Boe Technology Group Co., Ltd. | Display back plate and fabricating method thereof and display device |
| US10553826B2 (en) | 2016-01-04 | 2020-02-04 | Boe Technology Group Co., Ltd. | Optical waveguide and manufacturing method thereof, display substrate and display device |
| US11217775B2 (en) | 2016-01-04 | 2022-01-04 | Boe Technology Group Co., Ltd. | Optical waveguide and manufacturing method thereof, display substrate and display device |
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