CN204479887U - Display device - Google Patents
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- CN204479887U CN204479887U CN201520174326.6U CN201520174326U CN204479887U CN 204479887 U CN204479887 U CN 204479887U CN 201520174326 U CN201520174326 U CN 201520174326U CN 204479887 U CN204479887 U CN 204479887U
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Abstract
The utility model relates to display technique field, particularly relates to a kind of display device.This display device comprises: substrate; Around one or more cofferdams that the viewing area of described substrate is arranged; And the functional membrane formed in described viewing area.According to the technical solution of the utility model, cofferdam prevents functional ink to be diffused into the outer peripheral areas of substrate, thus is conducive to the functional membrane forming uniform film thickness, and reduces the consumption of functional ink.
Description
Technical field
The utility model relates to display technique field, and in particular to a kind of display device.
Background technology
In the display device of such as organic electroluminescence display device and method of manufacturing same and liquid crystal indicator, when forming organic or inorganic functional film, usually use the methods such as sputtering, evaporation, CVD.Recently, various functional membrane can be formed by coating process.Hole injection layer (HIL) particularly in organic electroluminescence display device and method of manufacturing same and the alignment film (such as polyimide alignment film) in liquid crystal indicator etc. adopt slit die coating machine (Die Slit Coater usually, DSC), ink-jet printer (Inkjet Printer, IJP) etc. are coated with.
Because the thickness of be coated with functional membrane is comparatively large to the function effect of display device, the good solvent of functional material (presoma of functional membrane) is easily dissolved in usual employing, to be formed uniformly functional membrane on substrate.In addition, in order to improve solvent wetting state on the surface of the substrate and in order to make dry after the profile (profile) of functional membrane even, also to use poor solvent, to make the functional membrane thickness after being coated with even.
When forming functional membrane with coating method, usually adopt the electric flush coater (Electric Spray Coater, ESC) shown in ink-jet printer IJP and Fig. 3 with piezoelectric element shown in slit die coating machine DSC, the Fig. 2 shown in Fig. 1.
Figure 1A, 1B and 1C are the schematic diagram utilizing slit die coating machine DSC coating function film on substrate.Substrate 104 is fixed on carrier 102.Coated components 106 advances along direction shown in arrow M, will comprise the ink coating of functional material on the substrate 104.After drying, functional ink 108 forms functional membrane 108 on the surface of substrate 104.Note, hereinafter, for simplicity, functional ink and the functional membrane formed by it use same or analogous Reference numeral to represent.
Fig. 2 A and 2B is the schematic diagram utilizing ink-jet printer IJP coating function film on substrate.Substrate 204 is fixed on carrier 202.Coated components 206 advances along direction shown in arrow M, will comprise the ink of functional material on substrate 204.Ink diffuses to form rete, and on the surface of substrate 204, forms functional membrane 208 after drying.
Fig. 3 A and 3B is the schematic diagram utilizing electric flush coater ESC coating function film on substrate.Substrate 304 is fixed on carrier 302.Coated components 306 advances along direction shown in arrow M, is sprayed on substrate 304 by the charged particle comprising functional material.Charged particle forms rete in the region limited by border 307, and on the surface of substrate 304, forms functional membrane 308 after drying.
But above-mentioned spraying equipment all needs to use expensive functional ink.In order to reduce the use amount of ink, expect only to be coated with in the part needed.
Use ink-jet printer IJP to be coated with in (On Demand) mode as required, not only can specify region to be coated, and can only be coated with in region to be coated.Use the slit width divided segmentation application type slit die coating machine DSC shown in Fig. 1 C, can realize to a certain extent being coated with as required.The electric flush coater ESC etc. using mask to carry out limiting dispensing area can come out in the near future.
On the one hand, from the functionally consideration of display device, the periphery frame region beyond viewing area (Active Area) is more and more less.On the other hand, the display device of narrow frame (Narrow Bezel) is quite praised highly in recent years.Fig. 4 A shows the vertical view of the substrate 404 being coated with functional membrane 408, and Fig. 4 B is the enlarged drawing of the corner 401 of Fig. 4 A, and Fig. 4 C is the enlarged drawing of corner 402 in Fig. 4 B.As shown in figs. 4 a-4 c, the wetting state of the functional ink 408 that this type of narrow frame display device is coated with on substrate 404 comparatively benefit starts diffusion, comes, form irregular diffusion front according to flat flat shape diffusion.Due to the uneven diffusion on substrate 404 of be coated with functional ink, make the in uneven thickness of the last functional membrane formed, cause the defect occurring luminous Mura in finished product display device thus.In addition, except covering viewing area 410, functional ink 408 also may cover the contact hole 430 of outer peripheral areas.Someone proposes to be diffused into by plasma or laser ablation the functional membrane not needing the functional ink 408 in part to be formed.But in this case, the sublimate that plasma or laser cause can have influence on the functional part in display device, therefore this is not the best mode for removing functional membrane.
The demand to the display device improved is there is in this area.
Utility model content
The purpose of this utility model is to alleviate or solve mentioned problem at least partly above.
According to embodiment of the present utility model, by the outer peripheral areas of the substrate in display device, cofferdam is set, thus when forming functional membrane on substrate, the functional ink be coated with is stopped by cofferdam and is not diffused into the outer peripheral areas of substrate, thus be conducive to the functional membrane forming uniform film thickness, and reduce the consumption of functional ink, and then alleviate at least partly or solve mentioned problem above.
In in first of the present utility model, provide a kind of display device, it comprises: substrate; Around one or more cofferdams that the viewing area of described substrate is arranged; And the functional membrane formed in described viewing area.
In display device of the present utility model, one or more cofferdam is arranged around the viewing area of substrate, and make when forming functional membrane by coating, the functional ink be coated with is stopped by cofferdam and do not diffuse into the outer peripheral areas of substrate.This contributes to the functional membrane forming uniform film thickness, decreases the defect of the such as luminous Mura caused in uneven thickness due to functional membrane (such as luminescent layer).In formation functional membrane process, can prevent functional ink from overflowing to the undesirably position of substrate, avoid the impact on other parts in display device, thus improve the yield of display device.Because functional ink is effectively limited in appointed area, the actual use amount of functional ink can be reduced thus, and then control the cost of display device.Owing to preventing functional ink to be diffused into undesirably position, the functional membrane therefore without the need to using the mode such as plasma or laser to remove undesirably position, Simplified flowsheet step.Because the functional membrane of formed such as luminescent layer has uniform thickness, this is conducive in subsequent technique, form the uniform rete of thickness, makes the even film layer ground luminescence in viewing area or display image.
According to embodiment of the present utility model, described cofferdam can have lyophobicity.By this, described cofferdam can prevent functional ink from adhering to effectively, and barrier functionality ink is to external diffusion better.
According to embodiment of the present utility model, the height of described cofferdam can be 0.5 μm-50 μm, is preferably 1 μm-10 μm, be more preferably 2 μm, and the width of described cofferdam can be 50 μm-5000 μm, is preferably 100 μm-1000 μm, it is more preferably 500 μm.The cofferdam with described height and width is cost-effective with regard to cofferdam makes, and can effectively barrier functionality ink to external diffusion.Preferably, each cofferdam can have identical or different height and width.
According to embodiment of the present utility model, at least one of described cofferdam can be continuous and closed.Such as, outermost cofferdam can be continuous and closed, thus effectively to suppress in coating process functional ink to external diffusion.
According to embodiment of the present utility model, described cofferdam can be formed by polyimide resin, acryl resin, melmac or polysiloxane.Such as can select to form described cofferdam with the organic material of the manufacture craft compatibility of display device.If consideration thermotolerance, then inorganic material can be selected to form described cofferdam.
According to embodiment of the present utility model, from the unilateral observation of described viewing area, the corner of described cofferdam can be right angle, polygon, R shape or circular arc.By this, described cofferdam can be conducive to preventing in coating process functional ink to external diffusion.
According to embodiment of the present utility model, groove can be formed with between described cofferdam or between outermost cofferdam and described viewing area.By this, in coating process, described groove can be contained in from cofferdam, inner side to the functional ink of external diffusion, prevent described functional ink from striding across outermost cofferdam to external diffusion.
According to embodiment of the present utility model, described groove can have lyophobicity.Such as, described groove can be made up of lyophobicity material, or through surface treatment to have lyophobicity.The groove with lyophobicity can prevent be coated with functional ink to external diffusion.
According to embodiment of the present utility model, the width of described groove can be 50 μm-5000 μm.By this, described groove can be contained in coating process effectively from cofferdam, inner side to the functional ink of external diffusion.
According to embodiment of the present utility model, the contact angle of described functional ink on the surface of described cofferdam and described groove can be at least 10 degree.By reducing the wellability of described functional ink on the surface of described cofferdam and described groove, improve described contact angle, be conducive to preventing the attachment of described functional ink on the surface of described cofferdam and described groove, stop that described functional ink is to external diffusion better.
According to embodiment of the present utility model, the contact angle of described functional ink on the surface of described cofferdam and described groove can be at least 30 degree.By this, as compared to the surface of described cofferdam with described groove, described functional ink is more prone to concentrate on the surface of such as ITO electrode, thus is conducive to the functional membrane forming uniform film thickness in ITO electrode on the surface.
According to embodiment of the present utility model, described display device can be organic electroluminescence display device and method of manufacturing same or liquid crystal indicator.When described display device is organic electroluminescence display device and method of manufacturing same, described functional membrane can be the luminescent layer of described organic electroluminescence display device and method of manufacturing same, such as hole transmission layer (HTL).When described display device is liquid crystal indicator, described functional membrane can be the both alignment layers of described liquid crystal indicator.
Accompanying drawing explanation
Hereinafter, by the mode of example, detailed explanation is carried out to the utility model with reference to embodiment by reference to the accompanying drawings and illustrate, in the accompanying drawings:
Figure 1A, 1B, 1C are respectively in prior art the schematic diagram utilizing slit die coating machine coating function film on substrate, and wherein Figure 1A is cross section view, and Figure 1B, 1C are three-dimensional view;
Fig. 2 A and 2B is respectively in prior art the schematic diagram utilizing ink-jet printer coating function film on substrate, and wherein Fig. 2 A is cross section view, and Fig. 2 B is three-dimensional view;
Fig. 3 A and 3B is respectively in prior art the schematic diagram utilizing electric flush coater coating function film on substrate, and wherein Fig. 3 A is cross section view, and Fig. 3 B is three-dimensional view;
Fig. 4 A, 4B, 4C are the schematic plan with functional ink diffusion during the coating of slit die coating machine in prior art;
Fig. 5 A is the schematic plan of the corner of the substrate of the display device of prior art, and Fig. 5 B is the schematic plan of the corner of the substrate of the display device of the utility model embodiment;
Fig. 6 is the schematic plan of the corner of the coating function ink metacoxal plate of the utility model embodiment;
The schematic cross sectional view of functional ink diffusion during Fig. 7 A, 7B, 7C, 7D, 7E are respectively coating process;
Fig. 8 A, 8B, 8C, 8D, 8E are respectively the schematic cross sectional view of functional ink diffusion when using slit die coating machine to be coated with;
Fig. 9 A, 9B, 9C, 9D, 9E are respectively the schematic cross sectional view of functional ink diffusion when using electric flush coater to be coated with; And
Figure 10 is the indicative flowchart of the display device method for making of the utility model embodiment.
Accompanying drawing is not necessarily drawn in proportion.The Reference numeral of integral multiple of identical or difference 100 is in the accompanying drawings all the time for same or analogous parts.
Embodiment
Following description is presented to make any those skilled in the art can reach and utilize the utility model, and this description is provided in the context of embody rule and requirement thereof.The various adjustment that those skilled in the art will easily expect disclosed embodiment, and the General Principle herein defined can be applied to other embodiment and application and not deviate from spirit and scope of the present utility model.Thus, the utility model is not limited to shown each embodiment, and should be given the most wide region consistent with claim.
The accompanying drawing of all embodiments of the utility model all schematically shows the structure relevant with utility model point and/or parts, and does not illustrate or only partly illustrate the structure irrelevant with utility model point and/or parts.
Employ following Reference numeral in the accompanying drawings.Carrier: 102,202,302; Substrate: 104,204,304,404,504,505; Coated components: 106,206,306,706,806,906; The border in region to be filmed: 307; Functional membrane: 108,208,308,408,608,708,808,908; The working direction (coating direction) of coated components: M; Be coated with the corner of the substrate of functional membrane: 401,402; Viewing area: 410,510,511; Cofferdam: 512A, 512B; Non-display area (Dummy Area): 520; Groove: 521; Contact hole: 430,530,531; Printing starts position: 700; The slit end of slit die coating machine DSC: 800.
Hereinafter, to form hole injection layer to explain design of the present utility model in organic electroluminescence display device and method of manufacturing same.Fig. 5 A schematically shows the corner of the substrate of the display device of prior art, to compare with the utility model.As shown in Figure 5A, the substrate 504 of organic electroluminescence display device and method of manufacturing same is divided into viewing area 510 and non-display area 520, and contact hole 530 is arranged in the periphery of viewing area 510.Fig. 5 B schematically shows the corner of the substrate of the display device of the utility model embodiment.As shown in Figure 5 B, the substrate of the organic electroluminescence display device and method of manufacturing same of the utility model embodiment is provided with cofferdam.Specifically, cofferdam 512A, 512B is arranged around viewing area 511 on substrate 505.Preferably, cofferdam 512A, 512B can be formed by lyophobicity material.Alternatively, cofferdam 512A, 512B can be formed by non-lyophobicity material.Preferably, lyophoby process can be carried out to the non-lyophobicity material of cofferdam 512A, 512B, make cofferdam 512A, 512B have lyophobicity.Two cofferdams 512A, 512B are schematically shown in Fig. 5 B.In this case, groove 521 is formed between outermost cofferdam 512A and secondary outside cofferdam 512B.Alternatively, substrate 505 only can be provided with a cofferdam 512A, forms groove 521 between this cofferdam and viewing area 511.Alternatively, substrate 505 can also be provided with three or more cofferdams.
When on the viewing area 511 that functional ink is coated on substrate 505, cofferdam 512A, 512B of being formed with groove 521 can prevent the diffusion of functional ink effectively.Such as, as shown in Figure 6, the functional ink of diffusion after coating flows into groove 521, is stopped and can not overflow to the outer peripheral areas of substrate 505, form the uniform functional membrane 608 of thickness thus in viewing area 511 by cofferdam 512A.First, such as, when this functional membrane 608 is the luminescent layer in organic electroluminescence display device and method of manufacturing same, because the thickness of luminescent layer is even, thereby reduce due to the luminous Mura caused in uneven thickness.The second, because functional ink is stopped the outer peripheral areas not diffusing into substrate 505 by cofferdam 512A, thus can not cause harmful effect to contact hole 531, and then improve the yield of organic electroluminescence display device and method of manufacturing same.3rd, because functional ink (with the final functional membrane 608 formed) is effectively limited the region in being surrounded by cofferdam, can being effectively controlled of the use amount of functional ink, this is conducive to the cost controlling organic electroluminescence display device and method of manufacturing same.4th, because functional ink (with the final functional membrane 608 formed) is prevented from being diffused into undesirably position, thus the functional membrane without the need to using the mode such as plasma or laser to remove undesirably position, this is conducive to reducing processing step and Controlling Technology cost.5th, because the functional membrane 608 of formed such as luminescent layer has uniform thickness, this is conducive in subsequent technique, form the uniform rete of thickness, makes the even film layer ground luminescence in viewing area or display image.
Figure 10 diagrammatically illustrates the process flow diagram of the display device method for making according to the utility model embodiment.As shown, according in the method for making of display device of the present utility model, when making the functional membrane of this display device, comprise the steps: that S1010 forms cofferdam around region to be coated on substrate; S1020 is coating function ink in region to be coated; And functional ink is formed as functional membrane by S1030.Form the method step after functional membrane and design of the present utility model and uncorrelated, therefore omit the description to it at this.In the utility model, only require that the step forming cofferdam performed before the step of coating function ink.
Below with reference to Fig. 7,8 and 9, the method for making according to the organic electroluminescence display device and method of manufacturing same of the utility model embodiment is described.
Adopt AN-100 alkali-free glass that such as Asahi Glass Co., Ltd (Asahi Glass Co., Ltd.) produces as substrate 505.Substrate 505 adopts the methods such as sputtering form aluminium film, photoetching is carried out to form various distribution to aluminium film, and forms required dielectric film by methods such as coatings.After the thin film transistor (TFT) (TFT) formed for driving and ito transparent electrode, by the polyimide film that coating formation such as 2 μm is thick, then form cofferdam 512A, 512B by photoetching etc., as shown in Figure 5 B.
Then by atmos plasma technological sourcing oxygen, surface-active-treatment is carried out by oxygen in ITO electrode.Then import carbon tetrafluoride (CF4), fluorination treatment is carried out to rib (Rib) surface of cofferdam 512A, 512B that polyimide film is formed, gives its lyophoby characteristic.Through this fluorination treatment, the surface of cofferdam 512A, 512B of polyimide has lyophobicity for functional ink, and the surface of ITO electrode still keeps good wellability to functional ink.Surface due to cofferdam 512A, 512B has lyophobicity and adheres to prevent functional ink, the wellability of functional ink on the rib surface of cofferdam is deteriorated, and makes cofferdam 512A, 512B can barrier functionality ink and being limited in groove 521 effectively.The contact angle of functional ink on the surface of cofferdam 512A, the 512B and groove 521 with lyophobicity is preferably at least 10 °, is more preferably at least 30 °.Such as, on the surface of cofferdam 512A, 512B of polyimide formation, by Nissan Chemical (Nissan Chemical Industries, the contact angle of the HIL ink Ltd.) provided is about 40 °, and on the surface of the ITO electrode of illuminating part, the contact angle of HIL ink is about less than 5 °.
Exemplarily, cofferdam 512A, 512B herein carry out fluorination treatment to have lyophobicity to its surface after being formed by the polyimide without lyophobicity subsequently.In the description, term lyophobicity refers to the characteristic functional ink for the formation of functional membrane in subsequent technique to repulsion.When the material itself forming cofferdam has lyophobicity, then without the need to the step of actuating surface process.As the material for the formation of cofferdam, organic material or inorganic material can be used.The organic material that can be used for being formed cofferdam includes but not limited to polyimide resin, acryl resin and melmac.The inorganic material that can be used for being formed cofferdam includes but not limited to polysiloxane.
In one embodiment, in made organic electroluminescence display device and method of manufacturing same, substrate 505 is of a size of 470mm × 370mmx0.7t, and substrate 505 is formed the viewing area 511 that catercorner length is 16 inches, aspect ratio is 4:3, resolution is 1024 × 768 (XGA resolution).Viewing area 511 is of a size of 324.608mm × 243.456mm.Pixel Dimensions is 0.317mm × 0.317mm, and the sub-pixel size of each RGB is 0.105667mm × 0.317mm, and light-emitting zone is the elliptical shape of 0.070mm × 0.210mm, as shown in Fig. 5 B, 6.
In the utility model, the width of cofferdam 512A, 512B can be 50 μm-5000 μm, is preferably 100 μm-1000 μm, is more preferably 500 μm.The height of cofferdam 512A, 512B can be 0.5 μm-50 μm, is preferably 1 μm-5 μm, is more preferably 2 μm.Each cofferdam 512A, 512B can have identical or different height and width.The width of groove 521 can be 50 μm-5000 μm, is preferably 100 μm-1000 μm, is more preferably 500 μm.Such as, as shown in Fig. 5 B, 6, the periphery of viewing area 511 is provided with the wide time outside cofferdam 512B of 0.200mm, at the outermost cofferdam 512A that the arranged outside of secondary outside cofferdam 512B has 0.300mm wide.The wide groove of 0.500mm 521 is provided with between outermost cofferdam 512A and secondary outside cofferdam 512B.
Then, adopt TAZMO CO., the slit die coating machine DSC that LTD. produces uses Nissan Chemical application type HIL ink (solid concentration 2%) to be coated with, and forming thickness is the functional membrane of 30nm, i.e. HIL.
The schematic cross sectional view of functional ink diffusion during Fig. 7 A-7E is respectively coating process.Specifically, Fig. 7 A-7E is the sectional view intercepted along the BB' of Fig. 5 B.The coated components 706 of such as ink-jet printer IJP or slit die coating machine DSC advances along direction M, the functional ink 708 for the formation of HIL is coated on substrate 505.Not shownly in Fig. 7 A-7E be formed at associated components on substrate 505 and layer, such as distribution, dielectric film, TFT, ITO electrode etc., thus simplified characterization.Moreover, in Fig. 7 A-7E, outermost cofferdam 512A and groove 521 are only shown.Fig. 7 A illustrates the state of coated components 706 just on substrate 505 during coating function ink 708, and Reference numeral 700 shows printing beginning position.As shown in Figure 7 B, after coating, functional ink 708 starts diffusion, flows into groove 521.As seen in figure 7 c, outermost cofferdam 512A stops functional ink 708 outwards overflow.As illustrated in fig. 7d, in drying process, functional ink 708 is volatilized gradually due to solvent wherein, and thickness reduces gradually.As seen in figure 7e, through sintering process, functional ink forms the functional membrane 708 of uniform film thickness in viewing area 511.
Fig. 8 A-8E is respectively the schematic cross sectional view of functional ink diffusion when using slit die coating machine DSC to be coated with.Specifically, Fig. 8 A-8E is the sectional view intercepted along the AA' of Fig. 5 B, that is, outboard profile when slit die coating machine DSC is seen by front.Functional ink 808 for the formation of HIL is coated on substrate 505 by the coated components 806 of such as slit die coating machine DSC.Similarly, not shownly in Fig. 8 A-8E be formed at associated components on substrate 505 and layer, such as distribution, dielectric film, TFT, ITO electrode etc., thus simplified characterization.Moreover, in Fig. 8 A-8E, the groove 521 outermost cofferdam 512A and time outside cofferdam 512B being shown and being formed at therebetween.Fig. 8 A illustrates the state of coated components 806 just on substrate 505 during coating function ink 808, and Reference numeral 800 illustrates the slit end of slit die coating machine DSC.As shown in Figure 8 B, after coating, functional ink 808 starts diffusion, is subject to time outside cofferdam 512B and stops.As shown in Figure 8 C, functional ink 808 spreads further, and may cross time outside cofferdam 512B and flow into groove 521, outermost cofferdam 512A stops functional ink 808 outwards overflow.As in fig. 8d, in drying process, functional ink 808 is volatilized gradually due to solvent wherein, and thickness reduces gradually.As illustrated in fig. 8e, through sintering process, functional ink forms the functional membrane 808 of uniform film thickness in viewing area 511.
In the embodiment using slit die coating machine DSC coating function ink, in the working direction (that is, being coated with direction) of coated components 806, the length in the region surrounded by cofferdam is preferably more than the painting cloth length of slit die coating machine DSC.Such as, the outermost cofferdam 512A shown in Fig. 8 A and the distance between the outermost cofferdam (not being shown in Fig. 8 A) being positioned at opposite side are in the coating direction greater than the painting cloth length of slit die coating machine DSC.Herein, be coated with cloth length and refer to that slit die coating machine DSC carries out the distance be coated with in the working direction of coated components 806 simultaneously.According to this embodiment, functional ink 808 can be effectively prevented to be coated directly onto outermost cofferdam 512A, for the diffusion of functional ink 808 leaves leeway.
When coating function ink, the slit direction of coated components 806 usually perpendicular to the working direction of coated components 806, that is, perpendicular to coating direction.In another embodiment using slit die coating machine DSC coating function ink, on the direction vertical with coated components 806 working direction, the length of outermost cofferdam 512A is preferably more than the width in region to be coated, and is greater than the width of the slit of coated components 806.According to this embodiment, functional ink can be effectively prevented to be coated directly onto outermost cofferdam 512A, for the diffusion of functional ink 808 leaves leeway.
Fig. 9 A-9E is respectively the schematic cross sectional view of functional ink diffusion when using electric flush coater ESC to be coated with.Specifically, Fig. 9 A-9E is the sectional view intercepted along the AA' of Fig. 5 B, and shows the electric mask of flush coater ESC and the position relationship of cofferdam.Such as electrically the functional ink 908 for the formation of HIL is coated on substrate 505 by the coated components 906 of flush coater ESC.More specifically, coated components 906 represents the mask that electric flush coater ESC uses in Fig. 9 A-9E.Similarly, not shownly in Fig. 9 A-9E be formed at associated components on substrate 505 and layer, such as distribution, dielectric film, TFT, ITO electrode etc., thus simplified characterization.Moreover, in Fig. 9 A-9E, the groove 521 outermost cofferdam 512A and time outside cofferdam 512B being shown and being formed at therebetween.Fig. 9 A illustrates the state of coated components 906 just on substrate 505 during coating function ink 908, and functional ink 908 is subject to time outside cofferdam 512B and stops.As shown in Figure 9 B, functional ink 908 spreads further, and may cross time outside cofferdam 512B and flow into groove 521, outermost cofferdam 512A stops functional ink 908 outwards overflow.As shown in Figure 9 C, functional ink 808 is in drying process, and functional ink 908 is volatilized gradually due to solvent wherein, and thickness reduces gradually.As shown in fig. 9d, along with the carrying out of drying process, the thickness of functional ink 908 reduces further.As shown in fig. 9e, through sintering process, functional ink forms the functional membrane 908 of uniform film thickness in viewing area 511.
In the embodiment using electric flush coater ESC coating function ink, in the projection in the direction perpendicular to substrate 505, the length of cofferdam 512A, 512B and width are preferably all greater than Opening length and the width of the mask that electric flush coater ESC uses.According to this embodiment, can effectively utilize electric flush coater ESC by mask functional ink is applied to by cofferdam around region to be coated in.
According to above-described embodiment of the present utility model, can form the uniform HIL of thickness in sub-pixel, this is conducive in subsequent technique, form the uniform rete of thickness, makes each thicknesses of layers in sub-pixel even, and then luminous equably, extend the light-emitting zone of sub-pixel thus.
When utilizing slit die coating machine DSC coating function film, the width of the slit of slit die is such as 243.000mm, arrange abreast with the 243.456mm minor face of viewing area 511, and contraposition adjustment is carried out at the center of the center of slit die and viewing area 511.In addition, the starting position of coating is 0.300mm place inwardly, viewing area 511, and the end position of coating is also 0.300mm place inwardly, viewing area.
The gap of now printing is 0.03mm, and the speed of printing is 30mm/sec.
After coating HIL ink, the hot plate (hot plate) of 80 ° of C carries out 5 minutes predrying, in the atmospheric atmosphere of 230 ° of C, then carry out the formal sintering of 20 minutes, cool subsequently.30 seconds are about from printing to the pre-dried time.The diffusion-condition of HIL ink is observed, determines that functional ink does not stride across outermost cofferdam 512A and spreads laterally.
After HIL 708,808,908 is formed, form HTL, white light-emitting layer, electron injecting layer (EIL), transparency electrode by evaporation mode, and use the AN-100 glass with RGB color filter (color filter) to encapsulate as cover plate (cover) glass.
Make multiple 16 inches of XGA organic electroluminescence display device and method of manufacturing same thus.After organic electroluminescence display device and method of manufacturing same modularity, when luminescence, obtain very evenly beautiful display effect.In addition, because functional ink can not flow into the electrode contact hole 531 being arranged on outside, viewing area 511, confirm that organic electroluminescence display device and method of manufacturing same is all lighted.
Continue with reference to figure 5A, 5B, owing to being provided with cofferdam 512A in the utility model, this cofferdam 512A prevents be coated with functional ink from spreading laterally effectively, so the amount of the functional ink of actual coating is less than the average requirement obtained according to areal calculation.
In preferred embodiment of the present utility model, cofferdam 512A, 512B itself can have lyophobicity, or have lyophobicity after surface treatment.Cofferdam 512A, the 512B with lyophobicity can prevent be coated with functional ink from spreading laterally better, reduce the amount of functional ink required when being coated with further.
In preferred embodiment of the present utility model, groove 521 can be made up of lyophobic material, or through surface treatment to have lyophobicity.Such as, when being formed cofferdam 512A, 512B by polyimide, the polyimide material between cofferdam 512A, 512B can partly retain, and forms the groove 521 sunk relative to cofferdam thus.In subsequent technique, cofferdam 512A, 512B and groove 521 simultaneously through surface treatment to have lyophobicity.The groove 521 with lyophobicity can prevent be coated with functional ink to external diffusion further, reduces the amount of functional ink required when being coated with thus further.
In preferred embodiment of the present utility model, at least one of multiple cofferdam is continuous and closed, and such as, outermost cofferdam 512A is continuous and closed, thus effectively to suppress in coating process functional ink to external diffusion.More preferably, secondary outside or inner side cofferdam also can be closed.
In preferred embodiment of the present utility model, from viewing area 511 unilateral observation, the corner of cofferdam 512A, 512B can be right angle, polygon, R shape or circular arc, thus to be conducive to preventing in coating process functional ink to external diffusion.
In the foregoing description, to form hole injection layer to explain design of the present utility model in organic electroluminescence display device and method of manufacturing same.But, it will be understood by those skilled in the art that the utility model not as limit.Such as, design of the present utility model may be used in organic electroluminescence display device and method of manufacturing same, form other organofunctional film, and in liquid crystal indicator, can form the alignment film of such as polyimide on color membrane substrates.
It is only the aforementioned description provided the utility model embodiment for the object illustrated and illustrate.They are not intended to exhaustive or restriction present disclosure.Therefore, those skilled in the art will easily expect many adjustment and modification.Scope of the present utility model will be defined by claims.
Claims (12)
1. a display device, is characterized in that, comprising:
Substrate;
Around one or more cofferdams that the viewing area of described substrate is arranged; And
The functional membrane formed in described viewing area.
2. display device according to claim 1, is characterized in that, described cofferdam has lyophobicity.
3. display device according to claim 1, is characterized in that, the height of described cofferdam is 0.5 μm-50 μm, and the width of described cofferdam is 50 μm-5000 μm.
4. display device according to claim 1, is characterized in that, the height of described cofferdam is 1 μm-10 μm, and the width of described cofferdam is 100 μm-1000 μm.
5. display device according to claim 1, is characterized in that, the height of described cofferdam is 2 μm, and the width of described cofferdam is 500 μm.
6. display device according to claim 1, is characterized in that, at least one of described cofferdam is continuous and closed.
7. display device according to claim 1, is characterized in that, described cofferdam is formed by polyimide resin, acryl resin, melmac or polysiloxane.
8. display device according to claim 1, is characterized in that, from the unilateral observation of described viewing area, the corner of described cofferdam is right angle, polygon, R shape or circular arc.
9. display device according to claim 1, is characterized in that, between described cofferdam or between outermost cofferdam and described viewing area, be formed with groove.
10. display device according to claim 9, is characterized in that, described groove has lyophobicity.
11. display device according to claim 9, is characterized in that, the width of described groove is 50 μm-5000 μm.
12. display device according to claim 1, is characterized in that, described display device is organic electroluminescence display device and method of manufacturing same or liquid crystal indicator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104698662A (en) * | 2015-03-26 | 2015-06-10 | 京东方科技集团股份有限公司 | Display device and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698662A (en) * | 2015-03-26 | 2015-06-10 | 京东方科技集团股份有限公司 | Display device and manufacturing method thereof |
| US9929367B2 (en) | 2015-03-26 | 2018-03-27 | Boe Technology Group Co., Ltd. | Display device and method for fabricating the same |
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