CN102610631B - OLED (organic light-emitting diode) display device with adjustable surface color and preparation method of OLED display device - Google Patents
OLED (organic light-emitting diode) display device with adjustable surface color and preparation method of OLED display device Download PDFInfo
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Abstract
The embodiment of the invention discloses an OLED (organic light-emitting diode) display device with adjustable surface color and a preparation method of the OLED display device. The device comprises a substrate, an OLED apparatus on the upper surface of the substrate and an encapsulating rear cover adhered to the upper surface of the substrate for encapsulating the OLED apparatus, wherein the OLED apparatus comprises an anode, an organic function layer and a cathode, which are sequentially arranged from down to up, a groove is arranged at one side of the encapsulating rear cover towards the substrate; the OLED apparatus is located inside the groove; the anode of the OLED apparatus is a semi-transparent metal electrode; the cathode is a full-reflecting metal electrode, or the anode is the full-reflecting metal electrode, and the cathode is the semi-transparent metal electrode. By the electrode structure, the OLED apparatus can display color on the surface when no light is emitted and natural light comes in, and simultaneously an optical path difference can be changed to change the color on the surface of the OLED display device by adjusting the thickness of the organic function layer.
Description
Technical field
The present invention relates to semiconductor device fabrication process technical field, more particularly, relate to adjustable OLED display of a kind of surface color and preparation method thereof.
Background technology
OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) display device, it is the novel display technique of one grown up mid-term in 20th century, there is ultra-thin, all solid state, active illuminating, fast response time, high-contrast, low-power consumption, low cost wide without angle limitations, operating temperature range, shock resistance is strong and can realize the plurality of advantages such as Flexible Displays, be widely used in the daily production of people, life.So OLED display will become optimal flat display apparatus of future generation, its superior function and huge market potential, in the production attracting the numerous producer in the whole world and scientific research institution to put into OLED display and research and development.
With reference to figure 1, Fig. 1 is the structural representation of existing a kind of OLED display, described OLED display comprises: the glass-encapsulated bonnet 1 be oppositely arranged and glass substrate 8, described encapsulation bonnet 1 and glass substrate 8 are sealed by packaging plastic 4, encapsulation bonnet 1 is provided with groove 2 towards the one side of glass substrate 8, drying agent 3 is pasted with in described groove 2, on glass substrate 8, the region of respective slot 2 is provided with OLED, and described OLED comprises transparent anode 5, organic function layer 6 and metallic cathode 7 from the bottom to top successively.After add suitable voltage between the transparent anode 5 and metallic cathode 7 of OLED, OLED issued light will penetrate from transparent glass substrate 8.
For existing OLED display, when OLED does not show therein, when namely himself is not luminous, color is with by color or self organic material that can only present photoresist under natural light.Namely existing OLED display is not when OLED shows therein, and its surperficial Show Color is comparatively single.
OLED electrode in OLED display of the prior art is an alltrans electrode and a full-transparency type electrode.Consider the cost of OLED display, OLED display adopts metal that cost performance is higher as alltrans electrode, but the reflectivity but causing reflecting electrode is larger.Namely existing OLED display adopts the higher material of low-cost reflectivity to prepare alltrans electrode, and another electrode is full-transparency type electrode.And the reflectivity of the OLED display of this kind of structure determines primarily of the reflectivity of alltrans electrode.Because the reflectivity of alltrans electrode is higher, from above-mentioned contrast formula, this contrast just causing OLED display is lower, makes its display effect under outdoor or sunlight irradiate poor.
In order to improve the contrast of OLED display in these cases, prepare reflecting electrode by adopting the metal material of antiradar reflectivity and not only increase production cost, and increasing the complicacy of technique, prior art is by arranging filter at the exiting surface of OLED display to eliminate the impact of natural light on device contrast.Although this kind of mode can improve the contrast of device to a certain extent, because the transmittance of optical filter is lower, is generally 30%-45%, the brightness of device is caused to reduce.
OLED display described in the present embodiment, by arranging half-penetration type electrode and alltrans electrode structure, can increase the contrast of described OLED display, can increase the brightness of device simultaneously relative to existing structure when regulating the thickness of organic function layer.
Concrete, when light is propagated between described half-penetration type electrode and alltrans negative electrode, reflection repeatedly and transmission can be there is between the anode of described half-penetration type, light path can be changed by regulating the thickness of organic function layer, the light wave of the wavelength that the light that organic function layer is sent is identical with the natural light of transmission occurs to strengthen interfering, and then increases the brightness of device.
If its transmittance of OLED display above by subsides polaroid is 30%-45%, and OLED display described in the present embodiment, the light that organic function layer is launched goes out at described half-penetration type electrode will through reflection projection repeatedly, the light intensity of each projection is previous 1/2nd, namely, when not considering that material absorbs, the intensity of the light finally launched is:
Wherein, n trends towards infinite, and actual light intensity is the superposition of infinite series.Be similar to:
Above-mentioned light intensity is approximately 87.5%, and namely the transmitance of light is 87.5%, and after when considering the absorption of material to light, the transmitance of its light is also greater than the percent of pass pasting polaroid and be.
Simultaneously, by regulating the thickness of organic function layer, under the effect of described half-penetration type electrode and alltrans electrode again, the natural light of the subband directly reflected at described half-penetration type electrode can be made and after described alltrans electrode reflection, again form destructive interference through the natural light of this wave band of described half-penetration type electrode outgoing transmitted through described half-penetration type electrode, the impact of natural light on device contrast can be reduced, improve the contrast of device.
Experimental result shows that the OLED display of said structure effectively can improve the contrast of device
With reference to figure 2, Fig. 2 for OLED display hole injection layer thickness described in the embodiment of the present invention is
time reflection spectrum curve figure.In figure, horizontal ordinate represents wavelength, and ordinate represents reflectivity.Now, the maximum optical wavelength of OLED is 560nm, and the reflectivity being 550nm place at wavelength is 59.351%.Wherein, selective light wavelength is the light of 550nm is because eye is that 550nm light (light near green glow light wave) perception is the most responsive to optical wavelength as the test wavelength of OLED display overall reflectivity, now can optimization brain to the perception of contrast.
With reference to figure 3, Fig. 3 for OLED display hole injection layer thickness described in the embodiment of the present invention is
time reflection spectrum curve figure.Now, the maximum optical wavelength of OLED is 620nm, and the reflectivity being 550nm place at wavelength is 39.865%.
With reference to figure 4, Fig. 4 for OLED display hole injection layer thickness described in the embodiment of the present invention is
time reflection spectrum curve figure.Now, the maximum optical wavelength of OLED is 500nm, and the reflectivity being 550nm place at wavelength is 20.934%.
From the data in Fig. 2-Fig. 4, in visible-range, OLED display described in the present embodiment increases along with the thickness of hole injection layer, and its overall reflectivity reduces, and from contrast formula, shows as contrast and increases.
With reference to the reflection spectrum curve figure that figure 5, Fig. 5 is OLED display in prior art.As shown in Figure 5, at most visible light wave range, its reflectivity is all greater than 60%, and when changing the thickness of hole injection layer, its data are without significant change.The reflectivity of OLED display of the prior art determines primarily of the reflectivity of alltrans electrode, can not be reduced the reflectivity of device entirety by the thickness changing hole injection layer.
Data in Fig. 5 are known with Data Comparison in Fig. 2-Fig. 4 respectively, and OLED display described in the present embodiment obviously reduces compared to its reflectivity of existing OLED display, and namely its contrast significantly improves, and substantially increases the display effect of OLED display.
Described half-penetration type electrode and alltrans electrode structure effectively can weaken the microcavity effect of OLED, and along with the change of observation angle, the colourity change of OLED display is little.
Table one
Known by data in table one, difference from 0 ° to 90 ° along with observation angle in the experimental data of OLED display described in the present embodiment, the maximum difference of the coordinate figure of chrominance C IE obviously reduces relative to the maximum difference of the reference data of the OLED display of ordinary construction.
With reference to figure 6, Fig. 6 for OLED display described in the embodiment of the present invention at hole injection layer is
the electroluminescent spectrum figure of Shi Butong observation angle.In figure, horizontal ordinate represents wavelength, and ordinate represents luminous relative intensity.As seen from the figure, observe visual angle be 0 °, 30 °, 60 ° and ~ 90 ° time, four corresponding spectral shift amounts are very little, and namely along with visual angle change, the colourity change of device is very little, matches with experimental data in table one.Wherein, ~ 90 ° refer to that observation angle is about 90 °.
It should be noted that, Fig. 6 is little in order to spectrum line side-play amount corresponding to above-mentioned four angles is described, and due to spectral line intensive, therefore mark distinguishes each spectral line.
In sum, OLED display described in the present embodiment can realize its surface color when it is not luminous by described half-penetration type electrode and alltrans electrode structure and show as colour, and by regulating the thickness of organic function layer to change optical path difference, and then regulate the change of surface color; Meanwhile, when it carries out luminescence display, by regulating the thickness of organic function layer, the contrast of regulating device can also be carried out, and then improve the display effect of device; And with the change at visual angle, the chrominance C IE change of OLED display described in the present embodiment is little.
Summary of the invention
In view of this, the invention provides adjustable OLED display of a kind of surface color and preparation method thereof, this OLED display is not when OLED shows therein, and its surface color can regulate according to the actual requirements, thus presents colour.
For achieving the above object, the invention provides following technical scheme:
The adjustable OLED display of a kind of surface color, this display device comprises:
Substrate;
Be positioned at the OLED on upper surface of base plate, described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top;
Encapsulation bonnet for described OLED is encapsulated mutually bonding with described upper surface of base plate, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove;
Wherein, the anode of described OLED is half-penetration type metal electrode, and negative electrode is alltrans metal electrode;
Or anode is alltrans metal electrode, and negative electrode is half-penetration type metal electrode.
Preferably, in above-mentioned display device, described organic function layer comprises tactic hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and electron injecting layer from the bottom to top.
Preferably, in above-mentioned display device, the thickness of described hole injection layer is
Preferably, in above-mentioned display device, the thickness of described half-penetration type metal electrode is
Preferably, in above-mentioned display device, the thickness of described alltrans metal electrode is
Preferably, in above-mentioned display device, also comprise:
Be attached in described groove the drying agent not shutting out the light and propagate.
Preferably, in above-mentioned display device, described encapsulation bonnet is bonding by epoxy encapsulation glue or UV glue with between described upper surface of base plate.
Preferably, in above-mentioned display device, described anode comprises: silver, aluminium, magnesium, copper, chromium, lanthanum, nickel or the alloying metal electrode formed by these metals.
Present invention also offers the method for making of the adjustable OLED display of a kind of surface color, it is characterized in that, comprising:
A substrate is provided;
Form OLED on the substrate, described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top;
There is provided the encapsulation bonnet that mutually bonding with described upper surface of base plate, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove, and described encapsulation bonnet is used for described OLED to be encapsulated;
Wherein, described organic function layer comprises tactic hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and electron injecting layer from the bottom to top;
The mode of described formation OLED is: form alltrans anode, described alltrans anode forms organic function layer, described organic function layer is formed half-penetration type negative electrode; Or, form half-penetration type anode, described half-penetration type anode form organic function layer, described organic function layer is formed alltrans negative electrode.
Preferably, in said method, the described OLED that formed on the substrate comprises:
OLED is formed on the substrate by evaporation process;
OLED is formed on the substrate by gas-phase deposition;
Or,
OLED is formed on the substrate by spin coating proceeding.
As can be seen from technique scheme, OLED display provided by the present invention, comprising: substrate; Be positioned at the OLED on upper surface of base plate, described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top; Encapsulation bonnet for described OLED device package is got up mutually bonding with described upper surface of base plate, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove; Wherein, the anode of described OLED is half-penetration type metal electrode, and negative electrode is alltrans metal electrode; Or anode is alltrans metal electrode, and negative electrode is half-penetration type metal electrode.
By above-mentioned electrode structure, described OLED can be made at portion's luminescence, the incident surperficial display color constantly of natural light, concrete, when natural light is incident, part natural light can be reflected by described half-penetration type electrode, a part reflects from described half-penetration type electrode after the reflection of alltrans metal electrode through described half-penetration type electrode again, the light directly reflected through described half-penetration type electrode like this and inject light that described half-penetration type electrode penetrates described half-penetration type electrode again after the reflection of alltrans metal electrode and formed and interfere, its appearance be colored display.Simultaneously by regulating the thickness of organic function layer to change optical path difference and then changing the color on OLED display surface.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of existing a kind of OLED display;
Fig. 2 for OLED display hole injection layer thickness described in the embodiment of the present invention is
time reflection spectrum curve figure;
Fig. 3 for OLED display hole injection layer thickness described in the embodiment of the present invention is
time reflection spectrum curve figure;
Fig. 4 for OLED display hole injection layer thickness described in the embodiment of the present invention is
time reflection spectrum curve figure;
Fig. 5 is the reflection spectrum curve figure of OLED display in prior art;
Fig. 6 for OLED display described in the embodiment of the present invention at hole injection layer is
time different angles electroluminescent spectrum figure;
The structural representation of a kind of bottom emitting OLED display that Fig. 7 provides for the embodiment of the present invention;
Fig. 8 is the structural representation of the OLED of OLED display described in Fig. 6;
The structural representation of a kind of top emitting OLED display that Fig. 9 provides for the embodiment of the present invention;
Figure 10 is the structural representation of base plate carving and corrosion pattern described in the embodiment of the present invention;
Figure 11 is the structural representation that Fabry-Bai Luo Gan relates to regulator.
Embodiment
Just as described in the background section, existing OLED display, when OLED does not show therein, when namely himself is not luminous, color is with by color or self organic material that can only present photoresist under natural light.Namely existing OLED display is not when OLED shows therein, and its surperficial Show Color is comparatively single.
Inventor studies discovery, can realize OLED display its surface color when not luminous, natural light irradiation show as colour and by regulating the thickness of OLED organic function layer to change its surface color by the metal electrode of the metal electrode of a high reverse--bias and a half-penetration type.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
Secondly, the present invention is described in detail in conjunction with schematic diagram, when describing the embodiment of the present invention in detail; for ease of explanation; the sectional view of indication device part structure can be disobeyed general ratio and be made partial enlargement, and described schematic diagram is example, and it should not limit the scope of protection of the invention at this.In addition, the three-dimensional space of length, width and height should be comprised in actual fabrication.
Embodiment one
Present embodiments provide the adjustable OLED display of a kind of surface color, this device comprises:
Substrate;
Be positioned at the OLED on upper surface of base plate, described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top;
Encapsulation bonnet for described OLED is encapsulated mutually bonding with described upper surface of base plate, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove;
Wherein, the anode of described OLED is half-penetration type electrode, and negative electrode is alltrans electrode;
Or anode is alltrans metal electrode, and negative electrode is half-penetration type metal electrode.
OLED anode in OLED display is half-penetration type metal electrode by the technical scheme that the embodiment of the present invention provides, and negative electrode is alltrans metal electrode; Or anode is alltrans metal electrode, and negative electrode is half-penetration type metal electrode.Wherein, half-penetration type electrode is semi-transflective reflective membrane electrode, when natural light is incident, part natural light can be reflected by described half-penetration type electrode, a part reflects from described half-penetration type electrode after the reflection of alltrans metal electrode through described half-penetration type electrode again, the light directly reflected through described half-penetration type electrode like this and inject light that described half-penetration type electrode penetrates described half-penetration type electrode again after the reflection of alltrans metal electrode and formed and interfere, its appearance be colored display.
By arranging optical path difference between two parts light, the thickness of the organic function layer namely between two electrodes regulates the light color after two parts interference of light, and then it is adjustable to realize surface color.Meanwhile, by regulating contrast and the brightness of all right regulating device of the thickness of organic function layer.
When traditional OLED display carries out luminescence display under outdoor or sunshine, originally non-luminous pixel can because the reflection of natural light, or in pixel, fluorescent material is luminous because absorbing sunshine middle-ultraviolet lamp, makes greatly to reduce in the contrast of outdoor OLED display.
And the contrast of bottom emitting OLED display of the present invention is higher.Concrete, the contrast of display device be one much larger than 1 constant, contrast formula is:
Contrast=(Lon+RLamb)/(Loff+RLamb)
Namely the brightness Lon under pixel light emission adds that the natural light RLamb of reflection is divided by the brightness Loff+RLamb under black picture.Wherein, R is the overall reflectivity of display device.Have above-mentioned formula known, when reflectivity R is larger, the contrast of display device is less, and its display effect under outdoor or sunlight is poorer.
Embodiment two
Based on scheme described in embodiment, present embodiments provide a kind of bottom emitting OLED display, with reference to figure 7, this device comprises:
The glass-encapsulated bonnet 1 be oppositely arranged and substrate 9, described encapsulation bonnet 1 and substrate 9 are sealed by cementing agent 10, encapsulation bonnet 1 is provided with groove 2 towards the one side of substrate 9, drying agent 3 is pasted with in described groove 2, on substrate 9, the region of respective slot 2 is provided with OLED, and described OLED comprises half-penetration type anode 11, organic function layer 12 and alltrans negative electrode 13 from the bottom to top successively.After add suitable voltage between the half-penetration type anode 11 and alltrans negative electrode 13 of described OLED, OLED issued light will penetrate from transparency carrier 9, as shown by arrows in FIG..
With reference to figure 8, described organic function layer 12 comprises tactic hole injection layer B1, hole transmission layer B2, luminescent layer B3, electron transfer layer B4 and electron injecting layer B5 from the bottom to top.Wherein, described luminescent layer B3 can require according to the colour developing of OLED display the luminous organic material selecting different colours.
When OLED is not luminous, under natural light irradiation, part natural light can be reflected by described half-penetration type anode 11, a part reflects from half-penetration type anode 11 after described alltrans negative electrode 13 reflects through described half-penetration type anode 11 again, like this through described half-penetration type anode 11 directly reflection light and inject light that described half-penetration type anode 11 penetrates described half-penetration type anode 11 again after alltrans negative electrode 13 reflects and formed and interfere, its appearance be colored display.
By regulating, optical path difference between two parts light being set, the optical path difference namely by regulating the thickness of the organic function layer between two electrodes to regulate two parts light, realizing described bottom emitting OLED display surface color adjustable.Two parts light interferes at the lower surface of substrate 9, forms multicolour pattern.
In order to ensure described half-penetration type anode to the half transmitting of natural light and the function of half reflection, the preferred thickness range of described half-penetration type anode is
silver, aluminium, magnesium, copper, chromium, lanthanum, nickel or the alloying metal that formed by these metals can be adopted to prepare described anode.Preferably, the present embodiment adopts silvery for described half-penetration type anode, and its thickness is
now, the contrast of OLED display and brightness best.
Wherein, described alltrans negative electrode adopts low-cost aluminium electrode, and its thickness is
the alltrans electrode production cost of aluminum is low, although its reflectivity is higher, reduces the reflectivity of OLED display entirety by the control method in embodiment one, thus improves the contrast of device.
Preferably, described cementing agent adopts and not easily turns to be yellow epoxy encapsulation glue or UV glue aging and bonding; Described substrate adopts ito glass substrate.
When ensureing that other organic functions layer thicknesses are constant within the scope of technological requirement, regulate optical path difference by regulating the thickness of hole injection layer.Preferably, the thickness of described hole injection layer is
in above-mentioned thickness range, regulate the thickness of described hole injection layer, effectively can regulate the optical path difference of interference light in visible-range, and then change the color on described bottom emitting OLED display surface.
As described in embodiment one, described OLED display its when not showing surface color for colored, and the adjustment of the present embodiment equally by regulating the thickness of organic function layer (the present embodiment is preferred, regulates the thickness of hole injection layer) to realize surface color when OLED display does not show; Meanwhile, when it is luminous, the contrast of the thickness regulating organic function layer also adjustable OLED display.Relative to existing bottom emitting OLED display, add comparison and brightness, and the adjustment of the surface color display achieved when device does not show and effects on surface color.
Embodiment three
Based on embodiment one, present embodiments provide a kind of top emitting OLED display, with reference to figure 9, this device comprises:
The glass-encapsulated bonnet 1 be oppositely arranged and substrate 9, described encapsulation bonnet 1 and substrate 9 are sealed by cementing agent 10, encapsulation bonnet 1 is provided with groove 2 towards the one side of substrate 9, do not shut out the light in described groove 2 to propagate on position and be pasted with drying agent 3, on substrate 9, the region of respective slot 2 is provided with OLED, and described OLED comprises alltrans anode 14, organic function layer 12 and half-penetration type negative electrode 15 from the bottom to top successively.After add suitable voltage between the alltrans anode 14 and half-penetration type negative electrode 15 of described OLED, OLED issued light will penetrate from transparent encapsulation bonnet 1, as shown by arrows in FIG..
Wherein, the structure of described organic function layer 12 is identical with structure described in embodiment two, comprise tactic hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and electron injecting layer from the bottom to top, described luminescent layer can require according to the colour developing of OLED display the luminous organic material selecting different colours.
Now, described half-penetration type negative electrode adopts magnesium, silver alloy film electrode, and its thickness is
described alltrans anode is silver metal electrode, and its thickness is
Equally, preferably, described cementing agent adopts and not easily turns to be yellow epoxy encapsulation glue or UV glue aging and bonding; Described substrate generally adopts ito glass substrate.
As described in embodiment one, described OLED display its when not showing surface color for colored, and the adjustment of the present embodiment equally by regulating the thickness of organic function layer (the present embodiment is preferred, regulates the thickness of hole injection layer) to realize surface color when OLED display does not show; Meanwhile, when it is luminous, the contrast of the thickness regulating organic function layer also adjustable OLED display.Relative to existing bottom emitting OLED display, add comparison and brightness, and the adjustment of the surface color display achieved when device does not show and effects on surface color.
Embodiment four
Present embodiments provide a kind of method for making of OLED display based on above-mentioned three embodiments, comprising:
Step S1 a: substrate is provided.
OLED mating shapes in the shape of described substrate and described OLED display.Can adopt ito glass substrate, this process is same as the prior art.
Concrete, evaporation is selected to have the ito glass substrate of assistant metal, ultraviolet and ozone process is carried out after cleaning-drying is carried out to described glass substrate, the exposure mask plate designed is utilized to make various substrate pattern by lithographic method, comprise: the making of the making of metal auxiliary electrode pattern, the making of transparent anode pattern, insulation course PI pattern and the making of cathode insulated column RiB pattern, the substrate pattern etched as shown in Figure 10, described substrate comprises: negative electrode cabling 01, insulation course PI02, negative electrode overlap joint walks block 03, insulated column RiB04, ITO pixel 05.
Step S2: form OLED on the substrate.
Described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top.
Described organic function layer comprises tactic hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and electron injecting layer from the bottom to top.
Aforesaid substrate forms anode construction, then puts it into antianode in pre-service cavity and carry out oxygen plasma treatment, reduce the potential barrier that hole is injected, to carry out the evaporation of hole injection layer.Concrete, after oxygen plasma treatment, in high vacuum conditions, adopt evaporation process evaporation hole injection layer, hole transmission layer, luminescent layer, electron transfer layer, electron injecting layer and negative electrode successively on described anode, thus on described glass substrate, prepare a complete OLED.
Anode and the negative electrode of evaporation different structure is come according to the illumination mode of described OLED display.
As described in OLED display be bottom emitting OLED display, then first on substrate after treatment, form half-penetration type anode, at described half-penetration type anodic formation organic function layer, described organic function layer form alltrans negative electrode.
Concrete, under certain vacuum tightness, use the shadow mask evaporation of little 5 μm-10 μm of the mask plate (shadow mask) than organic function layer, thickness exists
half-penetration type anode, preferably, described anode is silver membrane electrode, and its thickness is
Then, the shadow mask used with organic layer, evaporation hole injection layer HIL, hole transmission layer HTL, organic luminous layer EML, electron transfer layer ETL, electron injecting layer EIL and alltrans negative electrode successively.Wherein, alltrans negative electrode metal shadow mask evaporation, the thickness of alltrans negative electrode is
the thickness of alltrans negative electrode is
by the color regulating the thickness of HIL, HTL, EML, ETL and/or material (refractive index of different materials is different, and light path is not identical yet) that OLED display surface can be regulated at visible light wave range.
In order to ensure the evaporating quality of each OLED, whole evaporate process is all continual under high vacuum state carries out.
It should be noted that, the lap width of the shadow mask that the lap width of the shadow mask that evaporation anode is used uses than organic function layer is little, takes connection cause short circuit to avoid anode and negative electrode.
Also can form the OLED of the OLED display of top emitting in this step, now, first on substrate after treatment, form alltrans anode, described alltrans anode form organic function layer, described organic function layer is formed half-penetration type negative electrode.Concrete technology engineering is identical with the technique of the OLED in above-mentioned bottom emitting OLED display.
No matter be bottom emitting OLED display or top emitting OLED display, electrode during its OLED is coloured electrode, namely one, electrode is half-penetration type electrode and one is alltrans electrode, and when described colored electrodeposition electrode structure can make OLED display not show, surface presentation is colored.
As described in above-mentioned three embodiments, when above-mentioned colored electrodeposition electrode structure makes OLED display not show, surface presentation colour is the principle of interference that have employed light, the structure of OLED is prepared into the structure that a similar Fabry-Bai Luo Gan relates to regulator.
With reference to Figure 11; Fabry-Bai Luo Gan relates to regulator and comprises a total reflection layer 19 and one and half perspective layer 17; layer of transparent dielectric layer 18 is provided with between described total reflection layer 19 and semi-permeable layer 17; also be provided with the glassy layer 16 for the protection of said structure and glassy layer 20, wherein glassy layer 16 can adopt coloured glass to play the effect of optical filtering if desired simultaneously.
When there being light beam incident from top, be directly mirrored at a part of light of semi-permeable layer 17, a part can transmission and entering, and at semi-permeable layer 17, repeatedly transmission can occur when propagating between transparent dielectric layer 18 afterwards, and transmission and the light that goes out can be formed with the light directly reflected interferes.
The phase differential of mutual interference light is ΔΦ
m, its expression formula is:
ΔΦ
m＝4JId/λ
0(n
2 2-sin
2(i))
1/2＝2NJI(N＝1、2、3、......)
ΔΦ
mchange not only can be caused by the change of incident angle i, also can by wavelength X
0change cause.But for the n determined
2(refractive index of transparent dielectric layer 18), d (thickness of transparent dielectric layer 18), i (incident angle of incident beam) value, when the number of coherent light beam is very large, the ΔΦ that the light wave in light source produces
mbeing attenuated causing close to destructive interference small the departing from of 2NJI, not relating to regulator by Fabry-Bai Luo Gan, the light only having those strictly to meet above-mentioned formula could undampedly pass through.So, if when taking in Fabry-Bai Luo Gan's interferometer with white light plane wave with certain incident angle, only have those ΔΦs
mclosely the light of the wavelength components of 2NJI could pass through substantially undampedly.
And the OLED of OLED display of the present invention and above-mentioned Fabry-Bai Luo Gan relate to regulator has similar structure, the thickness controlling organic function layer by principle of interference regulates optical path difference, make the light generation destructive interference of subband in incident natural light, and then reduce natural light to the adverse effect of device contrast, improve the contrast of OLED display, and then improve its display effect.
Step S3: the encapsulation bonnet that mutually bonding with described upper surface of base plate is provided.
Put into glove box after the process such as carrying out the encapsulation bonnet prepared cleaning, dry, in glove box, attach drying agent at described encapsulation bonnet inwall.Afterwards, at described encapsulation bonnet lower surface surrounding coated with adhesive.Then, the encapsulation bonnet being coated with cementing agent is put into package system, have the glass substrate of OLED to encapsulate to above-mentioned preparation.In order to ensure the serviceable life of the OLED display after packaging effect and encapsulation, whole packaging technology is carried out in the high pure nitrogen environment of low steam, low oxygen.Wherein, described cementing agent preferably uses the epoxide-resin glue of not easy oxidation discoloration, is cured, completes the encapsulation of OLED display by modes such as UV ultraviolet irradiation or heating to described epoxide-resin glue.
Wherein, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove, and described encapsulation bonnet is used for described OLED to be encapsulated.
The material of each structure described in the present embodiment and size can with reference to above-mentioned three embodiments.
Upper method is when preparing OLED display, and relative to prior art, the method for the invention decreases the processing step pasting polaroid, improve work efficiency, meanwhile, because without the need to using polaroid, having saved production cost.
Two kinds of OLED display contained can be formed by said method, two electrodes of the OLED that colored electrodeposition electrode structure refers in described OLED display are respectively alltrans electrode and half-penetration type electrode, by described colored electrodeposition electrode structure, when OLED display can be made not show, surface is for colored, and its surface color changes by regulating the thickness of organic function layer; Meanwhile, the contrast of OLED display can be regulated by the thickness of known organic function layer.
It should be noted that, electrode structure described in the present invention is metal film electrode structure; Not only described " semi-transparent " refers to have transmission but also have reflex to light; Described " being all-trans " refers to only have reflection not have transmission.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. the adjustable OLED display of surface color, is characterized in that, comprising:
Substrate;
Be positioned at the OLED on upper surface of base plate, described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top;
Encapsulation bonnet for described OLED is encapsulated mutually bonding with described upper surface of base plate, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove;
Wherein, the anode of described OLED is half-penetration type metal electrode, and negative electrode is alltrans metal electrode;
Or anode is alltrans metal electrode, and negative electrode is half-penetration type metal electrode;
Described semi-transparent, not only refer to there is transmission but also there is reflex to light; Describedly to be all-trans, to refer to only have reflection there is no transmission;
Wherein, described organic function layer comprises tactic hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and electron injecting layer from the bottom to top; The thickness of described hole injection layer is
2. device according to claim 1, is characterized in that, the thickness of described half-penetration type metal electrode is
3. device according to claim 1, is characterized in that, the thickness of described alltrans metal electrode is
4. device according to claim 1, is characterized in that, also comprises:
Be attached in described groove the drying agent not shutting out the light and propagate.
5. device according to claim 1, is characterized in that, described encapsulation bonnet is bonding by epoxy encapsulation glue or UV glue with between described upper surface of base plate.
6. device according to claim 1, is characterized in that, described anode comprises: silver, aluminium, magnesium, copper, chromium, lanthanum, nickel or the alloying metal electrode formed by these metals.
7. a method for making for the adjustable OLED display of surface color, is characterized in that, comprising:
A substrate is provided;
Form OLED on the substrate, described OLED comprises tactic anode, organic function layer and negative electrode from the bottom to top;
There is provided the encapsulation bonnet that mutually bonding with described upper surface of base plate, described encapsulation bonnet is provided with groove towards the side of substrate, and described OLED is positioned at described groove, and described encapsulation bonnet is used for described OLED to be encapsulated;
Wherein, described organic function layer comprises tactic hole injection layer, hole transmission layer, luminescent layer, electron transfer layer and electron injecting layer from the bottom to top;
The mode of described formation OLED is: form alltrans anode, described alltrans anode forms organic function layer, described organic function layer is formed half-penetration type negative electrode; Or, form half-penetration type anode, described half-penetration type anode form organic function layer, described organic function layer is formed alltrans negative electrode;
Described semi-transparent, not only refer to there is transmission but also there is reflex to light; Describedly to be all-trans, to refer to only have reflection there is no transmission;
Wherein, the thickness of described hole injection layer is
8. method according to claim 7, is characterized in that, the described OLED that formed on the substrate comprises:
OLED is formed on the substrate by evaporation process;
OLED is formed on the substrate by gas-phase deposition;
Or,
OLED is formed on the substrate by spin coating proceeding.
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| CN104009166A (en) * | 2013-02-26 | 2014-08-27 | 海洋王照明科技股份有限公司 | Organic electroluminescent device and preparation method |
| CN105389049A (en) * | 2015-11-11 | 2016-03-09 | 京东方科技集团股份有限公司 | Touch OLED display device and method for manufacturing same |
| CN105633121B (en) * | 2016-01-05 | 2019-03-12 | 京东方科技集团股份有限公司 | A kind of electroluminescence display panel, its production method and display device |
| CN107421681B (en) * | 2017-07-31 | 2019-10-01 | 京东方科技集团股份有限公司 | A kind of pressure sensor and preparation method thereof |
| EP3520141B1 (en) | 2017-11-23 | 2022-01-05 | BOE Technology Group Co., Ltd. | Organic light emitting diode assembly, light source, and method of fabricating organic light emitting diode assembly |
| CN109037472B (en) * | 2018-07-19 | 2020-11-20 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and flexible display device |
| CN110767104B (en) * | 2018-07-25 | 2021-09-28 | 深圳Tcl新技术有限公司 | LED display screen and preparation method thereof |
| CN109065739B (en) * | 2018-07-27 | 2020-08-11 | 云谷（固安）科技有限公司 | OLED device packaging structure, manufacturing method and display device |
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| CN102157704A (en) * | 2011-03-11 | 2011-08-17 | 上海大学 | Light sources for lighting organic electroluminescence (OEL) plants and manufacturing method thereof |
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| CN202712274U (en) * | 2012-03-29 | 2013-01-30 | 信利半导体有限公司 | OLED display apparatus with surface color adjustable |
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| CN102157704A (en) * | 2011-03-11 | 2011-08-17 | 上海大学 | Light sources for lighting organic electroluminescence (OEL) plants and manufacturing method thereof |
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