CN1507068A - Organic electroluminescent diode display element - Google Patents
Organic electroluminescent diode display element Download PDFInfo
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- CN1507068A CN1507068A CNA021555788A CN02155578A CN1507068A CN 1507068 A CN1507068 A CN 1507068A CN A021555788 A CNA021555788 A CN A021555788A CN 02155578 A CN02155578 A CN 02155578A CN 1507068 A CN1507068 A CN 1507068A
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Abstract
The organic electroluminescent diode display element consists of mainly one transparent base board, several anodes, one organic functional layer, one light absorption layer and several cathodes. The anodes are configured on the transparent base board, the organic functional layer configured on the transparent base board covers the anodes, the light absorption layer is configured on the organic functional layer, and the cathodes are configured on the light absorption layer. The light absorption layer is utilized in improving the reflection to outer light and further increasing the contrast of the organic electroluminescent diode display element.
Description
Technical field
The invention relates to a kind of organic electric exciting light-emitting diode display element, and particularly relevant for a kind of organic electric exciting light-emitting diode display element with light absorbing zone.
Background technology
Communication industry has become main flow industry now, the emphasis that particularly portable various communication product develops especially, and flat-panel screens is man-machine communication interface, particular importance therefore seems.The technology that is applied in flat-panel screens now mainly contains following several: plasma scope (PlasmaDisplay Panel, PDP), LCD (Liquid Crystal Display, LCD), inorganic EL display (Electro-luminescent Display), light-emitting diode (Light EmittingDiode, LED), vacuum fluorescent display (Vacuum Fluorescent Display), field-emitter display (Field Emission Display, FED) and electrochromics display (Electro-chromicDisplay) etc.Yet, compared to other plane Display Technique, organic electric exciting light-emitting diode (OrganicLight Emitting Diode, advantages such as OLED), power saving interdependent with its self-luminous, no visual angle, manufacture craft are simple and easy, low-cost, low operating temperature scope, high answer speed and full-colorization and have great application potential are expected to become follow-on flat-panel screens.
Fig. 1 illustrates the generalized section into known organic electric exciting light-emitting diode display element.Please refer to Fig. 1, known organic electric exciting light-emitting diode display element mainly is made up of the metallic cathode 106 of transparent anode 102, an organic functional layer 104 and a plurality of strips of a transparency carrier 100, a plurality of strips.Wherein, transparency carrier 100 uses glass substrate usually; The material of transparent anode 102 is generally electrically conducting transparent materials such as tin indium oxide; Organic functional layer 104 is generally the multilayer organic film, and its (organic functional layer 104) includes plural layers such as electric hole implanted layer, electric hole transport layer, organic electric-excitation luminescent layer, electron transfer layer and electron injecting layer usually; And the material of metallic cathode 106 normally aluminium, calcium or magnesium-silver alloy etc.
For any display element, the complete dark brightness ratio of Quan Liangyu is the big factors of its resolution quality of decision, this brightness ratio for general be referred to as contrast (Contrast Ratio, CR), if big more its resolution of then representing of contrast is good more, and contrast is defined as follows shown in the formula (1):
Wherein, L
Sub, onBrightness when being lighted for pixel (pixel), L
Sub, offBrightness when not lighted, and R for pixel
AmbEnter the brightness that is reflected out in the display element for extraneous light, suppose that the brightness when pixel is lighted is 100, and brightness is not 1 when being lighted, and then can calculate relation between the contrast that extraneous light enters the brightness that is reflected out in the display element and display element according to formula (1).
Fig. 2 promptly illustrates the graph of a relation between the contrast and extraneous brightness in the known organic electric exciting light-emitting diode display element.By can significantly finding out among Fig. 2, to get over for a long time from the amount of organic electric exciting light-emitting diode demonstration reflection when extraneous light, its contrast can be more little, that is the resolution of display element can be poor more.Yet, for known organic electric exciting light-emitting diode display element, as if its recognition effect under strong extraneous light is desirable not to the utmost, and the contrast that therefore how to increase display element is one of problem that still must further break through at present to obtain preferable resolution.
The LUXELL corporate system is made have the interference of light layer organic electric exciting light-emitting diode display element of (Optical Interference Layer), it is mainly in the organic electric exciting light-emitting diode display element, metal half penetrated bed and the transparent material layer that add a very thin thickness between organic luminous layer and the metallic cathode, this transparent material layer is generally metal oxide, optical destructive interference effect by said structure can be reduced to the reflectivity of extraneous light below 1%, and then promotes the contrast of display element effectively.
Yet, organic functional layer in the organic electric exciting light-emitting diode display element partly is to adopt the mode of evaporation to form, but the transparent material layer in interference of light layer (metal oxide) can use the mode of sputter to carry out plated film, and therefore, the shortcoming of said method maximum is as follows:
1. must carry out being coated with of organic luminous layer and interference of light layer by different platform.
2. the result who carries out plated film by different platform can produce the rete problem of stress coupling each other, and then causes that acceptance rate descends, the manufacture craft cost increases.
3. interference of light layer is coated with sputtering way, because sputter manufacture craft intermediate ion bombardment (IonBombardment) has very big energy, the easy destruction of the energy of this ion bombardment has been coated with the organic luminous layer of finishing.
4. be coated with sputtering way owing to interference of light layer, but the investment of sputtering equipment (board) is comparatively expensive.
Summary of the invention
Purpose of the present invention is proposing a kind of organic electric exciting light-emitting diode display element with light absorbing zone, can reduce the amount that extraneous light reflects significantly from the organic electric exciting light-emitting diode display element, effectively being lifted at the contrast under the high light, and then increase the recognition effect of display element.
Another object of the present invention is proposing a kind of organic electric exciting light-emitting diode display element with light absorbing zone, light absorbing zone wherein adopts the mode of evaporation to make, plated film manufacture craft compatibility with organic luminous layer, manufacture craft is comparatively simple, and does not have the sputter manufacture craft and cause the ruined problem of organic luminous layer.
A further object of the present invention is proposing a kind of organic electric exciting light-emitting diode display element with light absorbing zone, light absorbing zone wherein is the material that general organic electric exciting light-emitting diode all can use, and does not therefore need additionally to increase other deposition material and equipment.
For reaching above-mentioned purpose of the present invention, propose a kind of organic electric exciting light-emitting diode display element and mainly constituted by a transparency carrier, a plurality of anode, an organic functional layer, a light absorbing zone and a plurality of negative electrode.Wherein, anode arrangement is on transparency carrier.The organic functional layer is disposed on the transparency carrier and covers anode, and light absorbing zone is disposed on the organic functional layer, and negative electrode then is disposed on the light absorbing zone.To improve the reflex of extraneous light, further increase the contrast of display element by light absorbing zone.
Among the present invention, anode and negative electrode for example are the structure of strip, and the bearing of trend of anode is perpendicular to the bearing of trend of negative electrode.Light absorbing zone is made of an organic material layer and half penetrated bed, the organic material layer for example for having the organic compound (Organic Compounds) or the organo-metallic compound (Organometallic Compounds) of electronic conduction ability, its material for example is CuPc (Copperphthalocyanine), and half penetrated bed for example constitutes with the metal of thinner thickness, and its material for example is an aluminum metal (Aluminum).
Among the present invention, the organic functional layer for example is made of an electric hole implanted layer, an electric hole transport layer, an organic electric-excitation luminescent layer, an electron transfer layer and an electron injecting layer.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. elaborate.
Description of drawings
Fig. 1 illustrates the generalized section into known organic electric exciting light-emitting diode display element;
Fig. 2 illustrates and is the graph of a relation between contrast and the extraneous brightness in the known organic electric exciting light-emitting diode display element;
Fig. 3 illustrates the schematic diagram into extraneous light reflection in the organic electric exciting light-emitting diode display element;
Fig. 4 illustrates and is the generalized section according to a preferred embodiment of the present invention organic electric exciting light-emitting diode display element;
Fig. 5 illustrates and is the graph of a relation between contrast in the organic electric exciting light-emitting diode display element and the extraneous brightness;
Fig. 6 illustrates and is the making flow chart according to a preferred embodiment of the present invention organic electric exciting light-emitting diode display element.
Indicate explanation:
100,200,300: transparency carrier 102,202,302: transparent anode
104,204,304: organic functional layer 106,206,308: metallic cathode
306: light absorbing zone 306a: the organic material layer
306b: half penetrated bed S400: transparent base is provided
S402: form transparent anode S404: evaporation organic functional layer
S406: evaporation light absorbing zone S408: form negative electrode
W
1, W
2, W
3: reflection ray L
1, L
2, L
3: light
Embodiment
Fig. 3 illustrates the schematic diagram into extraneous light reflection in the organic electric exciting light-emitting diode display element.Please refer to Fig. 3, the organic electric exciting light-emitting diode display element mainly is made up of the metallic cathode 206 of transparent anode 202, an organic functional layer 204 and a plurality of strips of a transparency carrier 200, a plurality of strips.Wherein, the refractive index n of organic functional layer 204
1Refractive index n with transparent anode 202
2Very approaching, and the refractive index n of organic functional layer 204
1For example greater than the refractive index n of transparency carrier 200
3, n wherein
1Be about about 1.7 n
2Approximately between 1.8 to 2.0, and n
3Be about about 1.5, and n
3Refractive index (≈ 1) greater than outside air.
Light in the organic electroluminescent display device is by 204 generation of organic functional layer, though the direct of travel of the light that produces is an any direction, metallic cathode 206 can be considered a reflector, so light only can spread out of towards transparency carrier 200 directions.
The light that spreads out of towards transparency carrier 200 directions can be subjected to the influence of extraneous light usually, and makes its identification not as expection.Wherein, when extraneous light enters organic electroluminescent display device, mainly can produce reflection with the interface of transparent anode 202 and the interface of organic functional layer 204 and metallic cathode 206, spread out of towards transparency carrier 200 directions again at interface, the transparency carrier 200 of air and transparency carrier 200.
The reflection ray W of air and transparency carrier 200 interfaces
1Account for 4%, the reflection ray W of transparency carrier 200 and transparent anode 202 interfaces
2Account for 0.8%, and the reflection ray W of organic functional layer 204 and metallic cathode 206 interfaces
3Then surpass 90%.Hence one can see that, and most reflection ray is produced by the reflection of metallic cathode 206.In other words, the interface between organic functional layer 204 and the metallic cathode 206 is the main source of reflection ray.
Fig. 4 illustrates and is the generalized section according to a preferred embodiment of the present invention organic electric exciting light-emitting diode display element.Please refer to Fig. 4, organic electric exciting light-emitting diode display element of the present invention mainly is made up of the metallic cathode 308 of transparent anode 302, an organic functional layer 304, light absorbing zone 306 and a plurality of strips of a transparency carrier 300, a plurality of strips.Wherein, transparency carrier 300 uses glass substrate usually; The material of transparent anode 302 is generally electrically conducting transparent materials such as tin indium oxide; Organic functional layer 304 is generally the multilayer organic film, and its (organic functional layer 304) includes plural layers such as electric hole implanted layer, electric hole transport layer, organic electric-excitation luminescent layer, electron transfer layer and electron injecting layer usually; And the material of metallic cathode 308 normally aluminium, calcium or magnesium-silver alloy etc.
Light absorbing zone 306 is made of an organic material layer 306a and half penetrated bed 306b.Wherein, organic material layer 306a's for example is organic compound (OrganicCompounds) or the organo-metallic compound (0rganometallic Compounds) with electronic conduction ability, and half penetrated bed 306b for example constitutes with the metal of thinner thickness.In addition, the material of organic material layer 306a for example is CuPc (Copper phthalocyanine), and the material of half penetrated bed 306b for example is an aluminum metal (Aluminum).Have the effect of optical interference by above-mentioned organic material layer 306a and half penetrated bed light absorbing zone that 306b constitutes 306, it can make the reflectivity of extraneous light descend by the optical destructive interference effect, and then promotes the contrast of display element effectively.
In other words, when extraneous light is incident to the interface of half penetrated bed 306b and organic functional layer 304, have partly light L
1Be reflected, and the phenomenon of part light penetration.The light that penetrates half penetrated bed 306b can be reflected by negative electrode 308 and turn back, and is reflected by negative electrode 308 and the light that turns back has partly light L equally
2Penetrate, and the phenomenon of portions of light line reflection.In addition, may take place repeatedly to reflect between half penetrated bed 306b and the metallic cathode 308 after just by the element outgoing, as light L
3In the present embodiment,, make light L by adjusting the thickness of organic material layer 306a
1, light L
2, light L
3Optical path difference to each other satisfies the condition of destruction interference, and then it is minimum to allow the intensity of reflection ray drop to, and reaches the purpose that improves contrast.
Fig. 5 illustrates and is the graph of a relation between contrast in the organic electric exciting light-emitting diode display element and the extraneous brightness.Please refer to Fig. 5, by learning easily among the figure, the present invention has the organic electric exciting light-emitting diode display element of light absorbing zone, and it can be better than traditional organic electric exciting light-emitting diode display element in the performance of contrast.
Fig. 6 illustrates and is the making flow chart according to a preferred embodiment of the present invention organic electric exciting light-emitting diode display element.Please refer to Fig. 6, the making of organic electric exciting light-emitting diode display element of the present invention mainly comprises the following step: transparent base S400, formation transparent anode S402, evaporation organic functional layer S404, evaporation light absorbing zone S406 are provided and form negative electrode S408.
The present invention still continues to use evaporated device to carry out the action of evaporation light absorbing zone S406 after evaporation organic functional layer S404.Wherein, the material that organic material layer 306a in the light absorbing zone 306 and half penetrated bed 306b are adopted is all the material that organic electric exciting light-emitting diode all can use, and does not therefore need additionally to increase other deposition material and equipment.
In sum, organic electric exciting light-emitting diode display element of the present invention has following advantage at least:
1. organic electric exciting light-emitting diode display element of the present invention can reduce the amount that extraneous light reflects significantly from the organic electric exciting light-emitting diode display element, effectively being lifted at the contrast under the high light, and then increase the recognition effect of display element.
2. in the organic electric exciting light-emitting diode display element of the present invention, light absorbing zone adopts the mode of evaporation to make, the plated film manufacture craft compatibility of itself and organic luminous layer, and manufacture craft is comparatively simple.
3. in the organic electric exciting light-emitting diode display element of the present invention, light absorbing zone adopts the mode of evaporation to make, and does not have the sputter manufacture craft and causes the ruined problem of organic luminous layer.
Though the present invention with a preferred embodiment openly as above; right its is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention defines and is as the criterion when looking claims.
Claims (11)
1, a kind of organic electric exciting light-emitting diode display element is characterized in that: comprise at least:
One transparency carrier;
A plurality of anodes are disposed on this transparency carrier;
One organic functional layer is disposed on this transparency carrier and covers those anodes:
One light absorbing zone is disposed on this organic functional layer, and wherein this light absorbing zone comprises an organic material layer and half penetrated bed;
A plurality of negative electrodes are disposed on this light absorbing zone.
2, organic electric exciting light-emitting diode display element as claimed in claim 1 is characterized in that: each those anode and each those negative electrode are a list structure.
3, organic electric exciting light-emitting diode display element as claimed in claim 2, it is characterized in that: the bearing of trend of those anodes is perpendicular to the bearing of trend of those negative electrodes.
4, organic electric exciting light-emitting diode display element as claimed in claim 1 is characterized in that: the material of this organic material layer comprises CuPc (Copper phthalocyanine).
5, organic electric exciting light-emitting diode display element as claimed in claim 1 is characterized in that: the material of this half penetrated bed is a metal.
6, organic electric exciting light-emitting diode display element as claimed in claim 5, it is characterized in that: the material of this half penetrated bed comprises aluminum metal.
7, organic electric exciting light-emitting diode display element as claimed in claim 1 is characterized in that: this organic functional layer comprises:
One electric hole implanted layer is disposed on those anodes:
One electric hole transport layer is disposed on this electricity hole implanted layer:
One organic electric-excitation luminescent layer is disposed on this electricity hole transport layer;
One electron transfer layer is disposed on this organic electric-excitation luminescent layer;
One electron injecting layer is disposed on this electron transfer layer.
8, a kind of light absorbing zone is suitable for being disposed among the organic electric exciting light-emitting diode display element between the organic functional layer and a plurality of negative electrode, and it is characterized in that: this light absorbing zone comprises:
Half penetrated bed, this half penetrated bed are disposed at this organic functional layer top;
One organic material layer is disposed between this half penetrated bed and those negative electrodes.
9, light absorbing zone as claimed in claim 8 is characterized in that: the material of this organic material layer comprises CuPc (Copper phthalocyanine).
10, light absorbing zone as claimed in claim 8 is characterized in that: the material of this half penetrated bed is a metal.
11, light absorbing zone as claimed in claim 8 is characterized in that: the material of this metal comprises aluminum metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021555788A CN1507068A (en) | 2002-12-11 | 2002-12-11 | Organic electroluminescent diode display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021555788A CN1507068A (en) | 2002-12-11 | 2002-12-11 | Organic electroluminescent diode display element |
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| Publication Number | Publication Date |
|---|---|
| CN1507068A true CN1507068A (en) | 2004-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021555788A Pending CN1507068A (en) | 2002-12-11 | 2002-12-11 | Organic electroluminescent diode display element |
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| CN (1) | CN1507068A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034736B (en) * | 2006-03-08 | 2013-08-21 | 株式会社半导体能源研究所 | Light emitting element, light emitting device, and electronic device |
| CN104183749A (en) * | 2013-05-22 | 2014-12-03 | 海洋王照明科技股份有限公司 | Inversed organic light emission diode, display screen and terminal |
-
2002
- 2002-12-11 CN CNA021555788A patent/CN1507068A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034736B (en) * | 2006-03-08 | 2013-08-21 | 株式会社半导体能源研究所 | Light emitting element, light emitting device, and electronic device |
| TWI475737B (en) * | 2006-03-08 | 2015-03-01 | Semiconductor Energy Lab | Light emitting element, light emitting device, and electronic device |
| CN104183749A (en) * | 2013-05-22 | 2014-12-03 | 海洋王照明科技股份有限公司 | Inversed organic light emission diode, display screen and terminal |
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