CN101866944A - Organic light-emitting diode display - Google Patents
Organic light-emitting diode display Download PDFInfo
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- CN101866944A CN101866944A CN 201010116687 CN201010116687A CN101866944A CN 101866944 A CN101866944 A CN 101866944A CN 201010116687 CN201010116687 CN 201010116687 CN 201010116687 A CN201010116687 A CN 201010116687A CN 101866944 A CN101866944 A CN 101866944A
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Abstract
The invention discloses an organic light-emitting diode (OLED) display. The organic light-emitting diode display comprises a substrate, a rear cover and a packaging adhesive, wherein the substrate is provided with a pixel display region matrix; a water-absorbing protection layer covers the surface of each pixel display region; the surface of the rear cover facing the substrate is provided with a light emitting region corresponding to the pixel display region matrix on the substrate; the rear cover also comprises at least one ring of continuous bumps surrounding the light emitting region at the periphery of the light emitting region; and the packaging adhesive is positioned on the contact surface of the substrate and the rear cover, surrounds the light emitting region and completely covers the at least one ring of bumps surrounding the light emitting region. By forming the bumps at the periphery of the light emitting region of the rear cover, the required adhesive strength can be ensured during the packaging of the OLED, the distance between the rear cover and the substrate can be greatly reduced, and the capability of the OLED of preventing the penetration of vapor and oxygen can be enhanced; and the vapor having penetrated into the OLED can be adsorbed by further covering a transparent water-absorbing protection layer on the pixel display region, so that the organic functional layer can be protected.
Description
Technical field
The present invention relates to a kind of electronic apparatus technical field, particularly relate to a kind of display of organic electroluminescence.
Background technology
Display of organic electroluminescence (OLED, Organic Light-Emitting Diode) is present emerging a kind of flat-panel monitor, since OLED have active illuminating, contrast height, can slimming, wide, the low-power consumption of response speed fast, no visual angle restriction, operating temperature range, shock resistance is strong and can the flexibility demonstration etc. plurality of advantages, be acknowledged as the main force of display of future generation.
The typical structure of existing OLED as shown in Figure 1, comprise: base plate glass 1, be deposited on the anode 2 on the base plate glass 1, cover the organic function layer 3 on the anode 2, be positioned at the negative electrode 4 on the organic function layer 3, the bonnet 6 corresponding with base plate glass 1 is attached to the drier 5 of bonnet 6 on negative electrode 4 one side luminous zones, and the packaging plastic 7 that is positioned at glass substrate 1 and bonnet 6 contact positions.
Lost efficacy easily because the luminous organic material in the organic function layer 3 is met steam oxygen,,, prolonged the useful life of OLED so that reduce of the damage of steam oxygen to organic function layer so must add bonnet 6 and drier 5 encapsulates.
Even but using bonnet and drier, the steam oxygen that still has considerable dosage penetrates in the OLED, damages organic function layer.Be still a difficult problem that needs to be resolved hurrily at present the useful life that how to prolong OLED.
Summary of the invention
The purpose of this invention is to provide a kind of OLED, to prolong the useful life of OLED.
The invention provides a kind of display of organic electroluminescence, comprising:
Substrate is formed with pixel display area matrix on the described substrate, in each pixel display area surface coverage the suction protective layer is arranged;
Bonnet, described bonnet is formed with the luminous zone corresponding with the pixel display area matrix on the substrate towards the one side of substrate, and described bonnet also comprises the continuous projection of at least one circle of surrounding described luminous zone in periphery, described luminous zone;
Packaging plastic is positioned at the contact-making surface of substrate and bonnet, described packaging plastic around described luminous zone and complete covering protruding around at least one circle of described luminous zone.
Concrete, the material of described suction protective layer can be the organic chelate of aluminium, iron and/or zinc.
Concrete, described organic chelate can be Alq3, Znq2.
Preferably, the thickness of described suction protective layer can be 10～500nm.
Preferably, described bonnet also is formed with groove between described luminous zone and described projection, be filled with drier in the described groove.
Concrete, described groove can be continuously or discrete distribution.
Preferably, the degree of depth of described groove is not more than half of bonnet thickness of glass.
Preferably, the degree of depth of described groove can be 0.1～0.4mm, and width is 0.1～10mm.
Preferably, the height of described projection can be 5～100 μ m, and width is 5～200 μ m.
Preferably, the cross section of described projection is trapezoidal.
Preferably, the distance between described projection and the substrate is 0.1～2 μ m.
OLED of the present invention by the peripheral projection that forms in the bonnet luminous zone, both can guarantee required bonding strength when OLED encapsulates, can significantly reduce the distance between bonnet and the substrate again, strengthened the ability that OLED stops that steam oxygen infiltrates; By further on pixel display area, covering the transparent water-absorbing protective layer, can adsorb the steam that has penetrated OLED inside, the protection organic function layer, and the suction manufacturing method of protective layer that increases is simple, can not cause bigger influence, effectively prolong the useful life of OLED production cycle and cost; By on bonnet, further being formed for loading the groove of drier, further prolonged the useful life of OLED.
Description of drawings
Fig. 1 is the typical section schematic diagram of existing OLED;
Fig. 2 is the schematic cross-section of OLED of the present invention;
Fig. 3 is the elevational schematic view of back cover glass of the present invention before cutting;
Fig. 4 is the enlarged diagram at I place among Fig. 3;
Fig. 5 is the enlarged diagram at K place among Fig. 2;
Fig. 6 is the schematic cross-section of an embodiment of bonnet of the present invention;
Fig. 7 is the schematic cross-section of another embodiment of bonnet of the present invention;
Fig. 8 is to use the schematic cross-section of the OLED of bonnet among Fig. 7;
Fig. 9 is the schematic flow sheet of embodiment of the manufacture method of bonnet of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the embodiment of the invention is described in further detail below in conjunction with the drawings and specific embodiments.
The inventor is through discovering: the steam oxygen that penetrates in the OLED mainly is to infiltrate by packaging plastic, and and bonnet and substrate between distance dependent: distance is big more, and the speed that steam oxygen infiltrates is just fast more, and the life-span of OLED is just short more.But consider the bond strength of bonnet and substrate, the thickness of packaging plastic can not be thin excessively.The present invention will provide a kind of OLED exactly; can under the prerequisite of the bond strength that guarantees bonnet and substrate, significantly reduce the distance of bonnet and substrate, stop the infiltration of steam oxygen; and the pixel display area on the further protective substrate of use suction protective layer, the useful life of prolongation OLED.
Embodiment one
Fig. 2 is the schematic cross-section of OLED of the present invention.The invention provides a kind of OLED, as shown in Figure 2, described OLED comprises: substrate 10, bonnet 20, packaging plastic 30.
Be formed with pixel display area matrix on the substrate 10; Each pixel display area in the described pixel display area matrix comprises transparent anode 101, organic function layer 102 and the negative electrode 103 that is deposited on successively on the substrate 10.In each pixel display area surface coverage suction protective layer 40 is arranged; If what select for use when preparation substrate 10 is special-purpose electro-conductive glass, the anode that the ITO of pre-deposition on the then described electro-conductive glass (Indium Tin Oxide, tin indium oxide) coating can be used as OLED uses.
At first, bonnet of the present invention is described in detail.Please be simultaneously referring to Fig. 3, Fig. 4, wherein, Fig. 3 is the elevational schematic view of back cover glass of the present invention before cutting, Fig. 4 is the enlarged diagram at I place among Fig. 3, also can regard the schematic diagram of a bonnet as.Existing manufacturing technique is considered the problem of efficient; usually back cover glass and base plate glass can be carried out contraposition, pressing respectively and solidify described packaging plastic before cutting into a plurality of bonnets and substrate; no matter but be cutting earlier or back cutting, the OLED structure that finally obtains is all as shown in Figure 2.
The height of projection 202 can be 5～100 μ m on the bonnet 20, and width can be 5～200 μ m.
When bonnet 20 during with substrate 10 involutions, because packaging plastic 30 can be embedded into the sunk area between the projection 202, make that packaging plastic has certain thickness between bonnet 20 and the substrate 10, guaranteed the intensity that both are bonding.Projection 202 can reach 0.1～2 μ m with distance between the substrate 10, and projection 202 is continuous one whole circle encirclement luminous zones 201, therefore, can significantly strengthen the blocking capability to steam oxygen, prolongs the useful life of OLED thus.
It is shown in Figure 5 trapezoidal that described protruding 202 cross section preferably is, and this structure is easier to packaging plastic 30 and is embedded into sunk area between the projection 202, guarantees bonding strength.The cross section pattern that the concentration of etching liquid that can be by control etching projection 202 and time are controlled projection 202.Described etching liquid is the acid solution that contains fluorine ion, and concentration is 10%～40%, and etch period is 1～20 minute.
The cross section of 201 peripheries, luminous zone also can be as shown in Figure 6, and is equal with projection 202 in the bonnet glass height of protruding 202 peripheries.Because packaging plastic 30 just can reach required bonding strength and height at protruding 202 places, therefore the bonnet glass structure of protruding 202 peripheries does not influence the effect that encapsulation back OLED stops steam oxygen.
In addition, because the ability that the OLED opposing steam oxygen that uses described bonnet encapsulation to form infiltrates improves greatly, can not attach drier in the luminous zone, therefore described bonnet also is fit to the OLED of top light emitting and lighting at two sides; Simultaneously, in the process of bonnet processing, can save on bonnet etching and be used to attach the depressed area (referring to Fig. 1, the about 0.2mm of the described depressed area degree of depth) of drier (can be the solid block that calcium oxide, barium monoxide or its composition etc. form), manufacturing process is simpler.Use the OLED life-span of described bonnet can reach 3～5 years, be significantly increased with respect to 100～200 days that have OLED now.
To requiring higher OLED useful life, can also between the luminous zone 201 of bonnet 20 and projection 202, form groove 203, described groove 203 is between described luminous zone 201 and a circle projection 202 adjacent with described luminous zone 201.The bonnet cross section that has formed groove 203 is filled with drier 204 (referring to Fig. 8) as shown in Figure 7 in the groove 203, be preferably liquid drier.Groove 203 can continuous distribution, promptly 201 forms a complete circle around the luminous zone, also can discrete distribution.
Consider the mechanical strength of bonnet 20, more excellent, the degree of depth of groove 203 is not more than half of bonnet thickness of glass.The degree of depth of groove 203 can be 0.1～0.4mm, and width can be 0.1～10mm, is advisable can use syringe needle filling liquid drier.
The bonnet 20 that has described groove 203, therefore the light-permeable because luminous zone 201 is not blocked, still goes for the OLED of top light emitting and lighting at two sides.
Described liquid drier can be at inert gas (as N
2) solidify back and substrate 10 encapsulation under the atmosphere.Can reach more than 10 years the useful life that use has projection and is filled with the OLED that the bonnet encapsulation of the groove of drier forms.
Secondly, introduce the suction protective layer on the substrate of the present invention.See also Fig. 2; suction protective layer 40 covers anode 101, organic function layer 102 and the negative electrode 103 of each pixel display area; suction protective layer 40 adopts the transparent water-absorbing material; for example; the material of suction protective layer 40 can be the organic chelate of aluminium, iron and/or zinc etc.; described organic chelate can be Alq3, Znq2 etc., and the substrate 10 that has covered suction protective layer 10 is equally applicable to the OLED device of top light emitting and lighting at two sides.
The thickness of suction protective layer 40 crosses that the thin suction protective effect that rises is just more limited, and thickness is blocked up can to extend manufacture cycle again, and therefore, the thickness of the protective layer 40 that absorbs water is preferably 10～500nm.
Suction protective layer 40 can adopt the mode of vacuum thermal evaporation to deposit in pixel display area.Can select thickness earlier for use is the special-purpose electro-conductive glass of organic electroluminescence device of 0.55mm, be manufactured with organic electroluminescence devices required auxiliary electrode Cr, transparency electrode ITO, insulating barrier PI and insulated column layer RIB with wet etching, after drying is good described electro-conductive glass put into the vacuum coating package system of organic electroluminescence device special use.Elder generation's using plasma is handled conductive glass surface; plate organic function layer 102 again, then plate negative electrode 103, then evaporation suction protective layer 40; vacuum degree during evaporation suction protective layer 40 more than the Torr, enters the package system of 99.999% above purity nitrogen gas at 10E (6) at last.
OLED of the present invention by the peripheral projection that forms in the bonnet luminous zone, both can guarantee required bonding strength when OLED encapsulates, can significantly reduce the distance between bonnet and the substrate again, strengthened the ability that OLED stops that steam oxygen infiltrates; By further on pixel display area, covering the transparent water-absorbing protective layer, can adsorb the steam that has penetrated OLED inside, the protection organic function layer, and the suction manufacturing method of protective layer that increases is simple, can not cause bigger influence, effectively prolong the useful life of OLED production cycle and cost; By on bonnet, further being formed for loading the groove of drier, further prolonged the useful life of OLED.
Embodiment two
Present embodiment provides the manufacture method of bonnet among the above-mentioned OLED, as shown in Figure 9, comprising:
S10 forms first pattern in the bonnet glass to the one side of substrate.
After choosing the back cover glass, also can comprise conventional polishing process.It is the white glass of 0.7mm that described back cover glass can be selected thickness for use.
First pattern hides the position of projection, and the part between luminous zone and the projection is come out.Described bonnet formation first pattern on glass can for: at the one side spin coating photoresist of described bonnet glass to substrate, exposure imaging forms described first pattern.Wherein, the spin coating of photoresist, exposure imaging can be same as the prior art.
Described bonnet formation first pattern on glass also can for: paste protective tapes in described bonnet glass to the one side of substrate, utilize laser engraving to go out described first pattern.Wherein, the stickup of protective tapes, laser engraving can be same as the prior art.
Described bonnet formation first pattern on glass can also for: form described first pattern to the one side of substrate by screen printing ink in described bonnet glass.
S20, according to described first pattern in the bonnet formation on glass luminous zone corresponding with in the continuous projection of at least one circle periphery, described luminous zone, that surround described luminous zone with the pixel display area matrix on the substrate.
Describedly be specifically as follows: around the one side that cover glass does not form first pattern after with two is fitted mutually and sealed, immerse that etching forms described projection in the acid solution that contains fluorine ion in bonnet formation projection on glass.It is trapezoidal that the cross section of described projection preferably is.The described acid solution concentration that contains fluorine ion is 10%～40%, and etch period is 1～20 minute.The height of described projection is 5～100 μ m, and width is 5～200 μ m.
S30 removes bonnet described first pattern on glass.
After forming projection, also comprise and remove first pattern (photoresist, protective tapes or printing ink that bonnet is on glass), obtain bonnet; afterwards; also comprise and clean the also process of dry bonnet, the technology that is adopted in these processes is same as the prior art, and the present invention repeats no more this.
Optionally, before step S10 or after the S20, can also comprise step S40: form the groove between described luminous zone and described projection, described groove is between described luminous zone and a circle projection adjacent with described luminous zone.
The forming process of described groove can comprise: form second pattern in described bonnet glass to the one side of substrate; According to described second pattern at the described groove of bonnet formation on glass; Remove bonnet described second pattern on glass.The degree of depth of described groove is 0.1～0.4mm, and width is 0.1～10mm.
The specific implementation that forms second pattern can be identical with the technological means that forms first pattern: or adopt spin coating photoresist, exposure imaging to form second pattern; Or adopt stickup protective tapes, laser engraving to form second pattern; Or adopt screen printing ink to form second pattern.
The specific implementation that forms groove can be identical with the technological means that forms projection: or around the one side that cover glass after two does not form second pattern fitted mutually and sealing, immersion contains that etching forms groove in the acid solution of fluorine ion, can select the etching liquid of identical composition when forming projection for use; Or the one side sandblast that bonnet glass has second pattern formed groove.
For forming the implementation that the projection back forms groove earlier, first pattern need hide the zone at protruding place, and second pattern exposes the zone at groove place; Form protruding implementation after forming groove earlier, second pattern exposes the zone at groove place, and first pattern hides the zone at protruding place, and can further hide the zone at groove place.
Because therefore the degree of depth of groove will, form protruding manufacturing process much larger than the height of projection after forming groove earlier, can groove not blocked when forming first pattern.A kind of preferred manufacture process is: adopt sandblast to form groove earlier, adopt the acid solution etching that contains fluorine ion to form projection again.Because it is slow than sandblast to contain the acid solution etching speed of fluorine ion, and it is also rough through the device surface of blasting treatment, therefore, after sandblast forms groove, the acid solution that employing contains fluorine ion carries out etching can be when forming projection, and the bottom and the sidewall of groove carried out smoothing processing.
The manufacture method of bonnet of the present invention, by the peripheral projection that forms in the luminous zone, when encapsulating, OLED both can guarantee required bonding strength, can significantly reduce the distance between bonnet and the substrate again, strengthen the ability that OLED stops that steam oxygen infiltrates, effectively prolonged the useful life of OLED; By on bonnet, further being formed for the groove of filling liquid drier, can further prolong the useful life of the OLED that uses this bonnet.
Need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (11)
1. a display of organic electroluminescence is characterized in that, comprising:
Substrate is formed with pixel display area matrix on the described substrate, in each pixel display area surface coverage the suction protective layer is arranged;
Bonnet, described bonnet is formed with the luminous zone corresponding with the pixel display area matrix on the substrate towards the one side of substrate, and described bonnet also comprises the continuous projection of at least one circle of surrounding described luminous zone in periphery, described luminous zone;
Packaging plastic is positioned at the contact-making surface of substrate and bonnet, described packaging plastic around described luminous zone and complete covering protruding around at least one circle of described luminous zone.
2. display of organic electroluminescence as claimed in claim 1 is characterized in that, the material of described suction protective layer is the organic chelate of aluminium, iron and/or zinc.
3. display of organic electroluminescence as claimed in claim 2 is characterized in that, described organic chelate is Alq3, Znq2.
4. display of organic electroluminescence as claimed in claim 1 is characterized in that, the thickness of described suction protective layer is 10～500nm.
5. display of organic electroluminescence as claimed in claim 1 is characterized in that, described bonnet also is formed with groove between described luminous zone and described projection, be filled with drier in the described groove.
6. display of organic electroluminescence as claimed in claim 5 is characterized in that, described groove is continuously or discrete distribution.
7. display of organic electroluminescence as claimed in claim 5 is characterized in that the degree of depth of described groove is not more than half of bonnet thickness of glass.
8. display of organic electroluminescence as claimed in claim 7 is characterized in that, the degree of depth of described groove is 0.1～0.4mm, and width is 0.1～10mm.
9. as each described display of organic electroluminescence of claim 1-8, it is characterized in that the height of described projection is 5～100 μ m, width is 5～200 μ m.
10. as each described display of organic electroluminescence of claim 1-8, it is characterized in that the cross section of described projection is trapezoidal.
11., it is characterized in that the distance between described projection and the substrate is 0.1～2 μ m as each described display of organic electroluminescence of claim 1-8.
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| CN103681768A (en) * | 2013-12-20 | 2014-03-26 | 合肥京东方光电科技有限公司 | OLED (organic light emitting diode) display device, OLED display device preparation method and OLED display unit |
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