CN101866944B - Organic light-emitting diode display - Google Patents
Organic light-emitting diode display Download PDFInfo
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- CN101866944B CN101866944B CN2010101166877A CN201010116687A CN101866944B CN 101866944 B CN101866944 B CN 101866944B CN 2010101166877 A CN2010101166877 A CN 2010101166877A CN 201010116687 A CN201010116687 A CN 201010116687A CN 101866944 B CN101866944 B CN 101866944B
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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 high, 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 is 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, encapsulated with drier 5,, prolonged the useful life of OLED so that reduce of the damage of steam oxygen to organic function layer so must add bonnet 6.
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 said substrate, in each pixel display area surface coverage the suction protective layer is arranged;
Bonnet, said bonnet towards the one side of substrate be formed with substrate on the corresponding luminous zone of pixel display area matrix, said bonnet also comprises the continuous convexity of at least one circle of surrounding said luminous zone in periphery, said luminous zone, said convexity and bonnet are one;
Packaging plastic is positioned at the contact-making surface of substrate and bonnet, said packaging plastic around said luminous zone and complete covering around at least one circle convexity of said luminous zone.
Concrete, the material of said suction protective layer can be the organic chelate of aluminium, iron and/or zinc.
Concrete, said organic chelate can be Alq3, Znq2.
Preferably, the thickness of said suction protective layer can be 10～500nm.
Preferably, said bonnet also is formed with groove between said luminous zone and said convexity, be filled with drier in the said groove.
Concrete, said groove can be continuously or discrete distribution.
Preferably, the degree of depth of said groove is not more than the half the of bonnet thickness of glass.
Preferably, the degree of depth of said groove can be 0.1～0.4mm, and width is 0.1～10mm.
Preferably, the height of said convexity can be 5～100 μ m, and width is 5～200 μ m.
Preferably, the cross section of said convexity is trapezoidal.
Preferably, the distance between said convexity and the substrate is 0.1～2 μ m.
OLED of the present invention through the peripheral convexity 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; Through further on pixel display area, covering the transparent water-absorbing protective layer; Can adsorb and penetrate the inner steam of OLED; The protection organic function layer; And the suction manufacturing method of protective layer that increases is simple, can not cause bigger influence to production cycle and cost, has effectively prolonged the useful life of OLED; Through 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 sketch map 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 manufacturing approach of bonnet of the present invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the embodiment of the invention done further detailed explanation.
The inventor is through discovering: the steam oxygen that penetrates in the OLED mainly is to infiltrate through 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 use the pixel display area on the further protective substrate of suction protective layer, prolong the useful life of 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, said 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 said 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 when preparation substrate 10, select for use is special-purpose electro-conductive glass, the anode that the ITO of pre-deposition on the then said 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 sketch map of a bonnet as.Existing manufacturing technique is considered the problem of efficient; Usually can back cover glass and base plate glass be carried out contraposition, pressing respectively and solidify said 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.
Bonnet 20 towards the one side of substrate 10 be formed with substrate 10 on the corresponding luminous zone 201 of pixel display area matrix, bonnet also comprises the continuous convexity 202 of at least one circle of surrounding said luminous zone 201 in 201 peripheries, said luminous zone.
The height of bonnet 20 raisings 202 can be 5～100 μ m, 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 protruding 202, make that packaging plastic has certain thickness between bonnet 20 and the substrate 10, guaranteed the intensity that both are bonding.Protruding 202 with substrate 10 between distance can reach 0.1～2 μ m, and protruding 202 are continuous one whole circle encirclement luminous zones 201, therefore, can significantly strengthen the blocking capability to steam oxygen, prolong the useful life of OLED thus.
It is shown in Figure 5 trapezoidal that said protruding 202 cross section preferably is, and this structure is easier to packaging plastic 30 and is embedded into the sunk area between protruding 202, guarantees bonding strength.The concentration of etching liquid that can be through control etching protruding 202 and time are controlled the cross section pattern of convexity 202.Said etching liquid is the acid solution that contains fluorine ion, and concentration is 10%～40%, and etch period is 1～20 minute.
201 peripheral cross sections, luminous zone also can be as shown in Figure 6, and are equal with protruding 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 protruding 202 peripheral bonnet glass structures do not influence the effect that encapsulation back OLED stops steam oxygen.
In addition, because the ability that the OLED opposing steam oxygen that uses said bonnet encapsulation to form infiltrates improves greatly, can not attach drier in the luminous zone, therefore said 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 the depressed area (referring to Fig. 1, the about 0.2mm of the said depressed area degree of depth) that on bonnet etching is used to attach 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 said 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 and protruding 202 of bonnet 20, form groove 203, said groove 203 is between said luminous zone 201 and a circle protruding 202 adjacent with said luminous zone 201.The bonnet cross section that has formed groove 203 is as shown in Figure 7, is filled with drier 204 (referring to Fig. 8) in the groove 203, is 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 the half the 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 said 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.
Said liquid drier can be at inert gas (like N
2) solidify back and substrate 10 encapsulation under the atmosphere.Can reach more than 10 years the useful life that use has the OLED that bonnet the encapsulation protruding and groove that is filled with 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, and for example, the material of suction protective layer 40 can be the organic chelate of aluminium, iron and/or zinc etc.; Said 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 the required auxiliary electrode Cr of organic electroluminescence devices, transparency electrode ITO, insulating barrier PI and insulated column layer RIB with wet etching, after drying is good said electro-conductive glass put into the special-purpose vacuum coating package system of organic electroluminescence device.Elder generation's using plasma is handled conductive glass surface; Plate organic function layer 102 again, then plate negative electrode 103, then vapor deposition suction protective layer 40; Vacuum degree during vapor deposition suction protective layer 40 more than the Torr, gets into the package system of 99.999% above purity nitrogen gas at 10E (6) at last.
OLED of the present invention through the peripheral convexity 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; Through further on pixel display area, covering the transparent water-absorbing protective layer; Can adsorb and penetrate the inner steam of OLED; The protection organic function layer; And the suction manufacturing method of protective layer that increases is simple, can not cause bigger influence to production cycle and cost, has effectively prolonged the useful life of OLED; Through on bonnet, further being formed for loading the groove of drier, further prolonged the useful life of OLED.
Embodiment two
Present embodiment provides the manufacturing approach of bonnet among the above-mentioned OLED, and is 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 said back cover glass can be selected thickness for use.
First pattern hides the position of convexity, and the part between luminous zone and the convexity is come out.Said bonnet formation first pattern on glass can for: at the one side spin coating photoresist of said bonnet glass to substrate, exposure imaging forms said first pattern.Wherein, the spin coating of photoresist, exposure imaging can be identical with prior art.
Said bonnet formation first pattern on glass also can for: paste protective tapes in said bonnet glass to the one side of substrate, utilize laser engraving to go out said first pattern.Wherein, the stickup of protective tapes, laser engraving can be identical with prior art.
Said bonnet formation first pattern on glass can also for: form said first pattern to the one side of substrate through screen printing ink in said bonnet glass.
S20, according to said first pattern the bonnet formation on glass luminous zone corresponding with the pixel display area matrix on the substrate and in said luminous zone the continuous convexity of at least one circle peripheral, that surround said luminous zone.
Said around bonnet formation convexity on glass specifically can be fitted each other for: the one side that cover glass does not form first pattern after with two and seal, immerse that etching forms said convexity in the acid solution that contains fluorine ion.It is trapezoidal that the cross section of said convexity preferably is.The said acid solution concentration that contains fluorine ion is 10%～40%, and etch period is 1～20 minute.The height of said convexity is 5～100 μ m, and width is 5～200 μ m.
S30 removes bonnet said first pattern on glass.
After forming convexity, 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 identical with prior art, and the present invention repeats no more to this.
Optional, before step S10 or after the S20, can also comprise step S40: form the groove between said luminous zone and said convexity, said groove is between said luminous zone and a circle convexity adjacent with said luminous zone.
The forming process of said groove can comprise: form second pattern in said bonnet glass to the one side of substrate; According to said second pattern at the said groove of bonnet formation on glass; Remove bonnet said second pattern on glass.The degree of depth of said groove is 0.1～0.4mm, and width is 0.1～10mm.
The concrete 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 concrete implementation that forms groove can be with to form protruding technological means identical: or around the one side that cover glass after two does not form second pattern fitted each other and seal; Immersion contains that etching forms groove in the acid solution of fluorine ion, can select the etching liquid of identical composition when forming convexity for use; Or the one side sandblast that bonnet glass has second pattern formed groove.
For forming the implementation that protruding back forms groove earlier, first pattern need hide the zone at protruding place, and second pattern exposes the zone at groove place; After forming groove earlier, form protruding implementation, 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 convexity after forming groove earlier, can when forming first pattern, groove not blocked.A kind of preferred manufacture process is: adopt sandblast to form groove earlier, adopt the acid solution etching that contains fluorine ion to form convexity 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, adopt the acid solution that contains fluorine ion carry out etching can form protruding in, the bottom and the sidewall of groove carried out smoothing processing.
The manufacturing approach of bonnet of the present invention; Through the peripheral convexity that forms in the luminous zone,, OLED both can guarantee required bonding strength when encapsulating, 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; Through 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 relation or the order that has any this reality 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.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, 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 said substrate, in each pixel display area surface coverage the suction protective layer is arranged;
Bonnet, said bonnet towards the one side of substrate be formed with substrate on the corresponding luminous zone of pixel display area matrix, said bonnet also comprises the continuous convexity of at least one circle of surrounding said luminous zone in periphery, said luminous zone, said convexity and bonnet are one;
Packaging plastic is positioned at the contact-making surface of substrate and bonnet, said packaging plastic around said luminous zone and complete covering around at least one circle convexity of said luminous zone.
2. display of organic electroluminescence as claimed in claim 1 is characterized in that, the material of said 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, said organic chelate is Alq3, Znq2.
4. display of organic electroluminescence as claimed in claim 1 is characterized in that, the thickness of said suction protective layer is 10～500nm.
5. display of organic electroluminescence as claimed in claim 1 is characterized in that, said bonnet also is formed with groove between said luminous zone and said convexity, be filled with drier in the said groove.
6. display of organic electroluminescence as claimed in claim 5 is characterized in that, said 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 said groove is not more than the half the of bonnet thickness of glass.
8. display of organic electroluminescence as claimed in claim 7 is characterized in that, the degree of depth of said groove is 0.1～0.4mm, and width is 0.1～10mm.
9. like each described display of organic electroluminescence of claim 1-8, it is characterized in that the height of said convexity is 5～100 μ m, width is 5～200 μ m.
10. like each described display of organic electroluminescence of claim 1-8, it is characterized in that the cross section of said convexity is trapezoidal.
11., it is characterized in that the distance between said convexity and the substrate is 0.1～2 μ m like each described display of organic electroluminescence of claim 1-8.
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| CN2010101166877A CN101866944B (en) | 2010-02-26 | 2010-02-26 | Organic light-emitting diode display |
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| CN2010101166877A CN101866944B (en) | 2010-02-26 | 2010-02-26 | Organic light-emitting diode display |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097454A (en) * | 2010-11-19 | 2011-06-15 | 信利半导体有限公司 | OLED (Organic Light Emitting Diode) display and manufacturing method thereof |
| CN102751442B (en) * | 2011-04-19 | 2016-04-13 | 海洋王照明科技股份有限公司 | Organnic electroluminescent device and preparation method thereof |
| US8803187B2 (en) | 2012-10-22 | 2014-08-12 | Empire Technology Development Llc | Protection of light emitting devices |
| CN103811432B (en) * | 2012-11-12 | 2016-09-14 | 财团法人工业技术研究院 | Environment sensitive electronic element packaging body |
| CN103681768B (en) * | 2013-12-20 | 2017-01-11 | 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 |
| CN103915573B (en) * | 2014-03-05 | 2017-05-17 | 厦门天马微电子有限公司 | Packaging cover plate, manufacturing method and display device |
| CN103887446A (en) * | 2014-03-10 | 2014-06-25 | 京东方科技集团股份有限公司 | Encapsulation structure for OLED device and encapsulation method and lighting device of OLED device |
| CN104576972A (en) * | 2014-12-02 | 2015-04-29 | 深圳市华星光电技术有限公司 | OLED (organic light-emitting diode) packaging method and OLED packaging structure |
| CN104538555A (en) * | 2014-12-02 | 2015-04-22 | 深圳市华星光电技术有限公司 | OLED packaging structure and OLED packaging method |
| CN104979373A (en) * | 2015-05-26 | 2015-10-14 | 京东方科技集团股份有限公司 | Substrate for display and display device |
| CN105118931B (en) * | 2015-09-10 | 2017-07-04 | 京东方科技集团股份有限公司 | A kind of array base palte, organic EL display panel and display device |
| CN107210375B (en) * | 2015-12-30 | 2019-01-15 | 深圳市柔宇科技有限公司 | Flexible display screen and flexible display screen production method |
| TWI582662B (en) * | 2016-03-14 | 2017-05-11 | 財團法人工業技術研究院 | Electrical device |
| CN106784390A (en) | 2017-03-06 | 2017-05-31 | 京东方科技集团股份有限公司 | Substrate for display panel and preparation method thereof, display panel and method for packing |
| CN109920806B (en) * | 2019-04-02 | 2021-08-03 | 业成科技（成都）有限公司 | Display module, touch display panel using same and electronic device |
| CN112750846B (en) * | 2021-01-04 | 2023-06-06 | 武汉华星光电半导体显示技术有限公司 | OLED display panel and OLED display device |
| CN113013352B (en) * | 2021-01-29 | 2023-07-21 | 固安翌光科技有限公司 | Film packaging structure and organic photoelectric device |
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| CN1200465C (en) * | 2001-10-24 | 2005-05-04 | 翰立光电股份有限公司 | Packaged structure of display element and its packaging method |
| CN100461492C (en) * | 2005-03-21 | 2009-02-11 | 友达光电股份有限公司 | Organic electroluminescent display and packaging method thereof |
| CN101080121A (en) * | 2007-07-06 | 2007-11-28 | 清华大学 | An organic EL part and its making method |
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