CN111883657B - Display device and manufacturing method thereof - Google Patents
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- CN111883657B CN111883657B CN201910688141.XA CN201910688141A CN111883657B CN 111883657 B CN111883657 B CN 111883657B CN 201910688141 A CN201910688141 A CN 201910688141A CN 111883657 B CN111883657 B CN 111883657B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000002904 solvent Substances 0.000 claims abstract description 60
- 239000006096 absorbing agent Substances 0.000 claims abstract description 54
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 238000007639 printing Methods 0.000 claims description 15
- 238000009835 boiling Methods 0.000 claims description 12
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 6
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 6
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 claims description 6
- OCKPCBLVNKHBMX-UHFFFAOYSA-N butylbenzene Chemical compound CCCCC1=CC=CC=C1 OCKPCBLVNKHBMX-UHFFFAOYSA-N 0.000 claims description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 claims description 6
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 claims description 6
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 6
- MTZQAGJQAFMTAQ-UHFFFAOYSA-N ethyl benzoate Chemical compound CCOC(=O)C1=CC=CC=C1 MTZQAGJQAFMTAQ-UHFFFAOYSA-N 0.000 claims description 6
- HFPZCAJZSCWRBC-UHFFFAOYSA-N p-cymene Chemical compound CC(C)C1=CC=C(C)C=C1 HFPZCAJZSCWRBC-UHFFFAOYSA-N 0.000 claims description 6
- -1 benzyl alcohol, phthalic acid ester Chemical class 0.000 claims description 4
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 claims description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 3
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 claims description 3
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 claims description 3
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 16
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- 238000009825 accumulation Methods 0.000 abstract description 4
- 239000010408 film Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 9
- 238000007641 inkjet printing Methods 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- DTBNBXWJWCWCIK-UHFFFAOYSA-N phosphoenolpyruvic acid Chemical compound OC(=O)C(=C)OP(O)(O)=O DTBNBXWJWCWCIK-UHFFFAOYSA-N 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005525 hole transport Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention relates to a display device and a manufacturing method thereof, wherein a filling groove is formed on the top side of a pixel defining structure, and a vapor absorber is printed in the filling groove to absorb a solvent volatilized from ink, so that the concentration of the solvent vapor around a pixel pit is reduced, and the volatilization rate of the ink is accelerated. Since the volatilization rate of the ink in the original pixel pit is affected by the concentration of the solvent vapor volatilized from the ink and accumulated around the ink, the accumulation of the solvent vapor in different areas on the substrate leads to different volatilization rates in different areas, and further leads to different film formation morphology. Therefore, the solvent vapor absorber absorbs the solvent vapor accumulated around the pixel pits, so that the concentration of the solvent vapor between different areas on the substrate tends to be uniform, and the uniformity of film formation in the pixel pits in different areas can be improved, thereby effectively improving the brightness or color coordinate difference caused by the regional film formation morphology difference, improving the display effect of the printed display panel and improving the device yield.
Description
Technical Field
The invention relates to the field of display devices, in particular to a display device and a manufacturing method thereof.
Background
Organic Light Emitting Diodes (OLEDs) and other display devices are widely used in the fields of new-generation mobile phone screens, computer displays, full-color televisions, and the like, because of their advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, and the like.
As shown in fig. 1 and 2, the process of preparing the OLED by ink jet printing is to deposit ink 3 in the pixel pits 21 formed by the pixel defining structure 2 on the substrate 1, then dry under reduced pressure to evaporate the solvent completely, leaving only the organic material, and then bake the organic material to complete the preparation of a functional layer.
During the inkjet printing process, the printhead 4 can only fill a plurality of columns of pixel pits 21 in one pass, so that the filling of the ink 3 in the pixel pits 21 of different areas is in sequential order. During printing, the evaporation rate of the ink 3 in the pixel pits 21 is affected by the concentration of the solvent vapor around it. Therefore, when the entire substrate is printed into the vacuum drying stage, there is a large difference in the volatilization of the ink 3 in the pixel pits 21 of different areas.
After drying under reduced pressure, the morphology of the thin film in the pixel pits 21 in different areas on the substrate is greatly different, as shown in fig. 3, for example:
(1) Firstly, printing an area, wherein the drying condition is close to natural volatilization, the effect of a coffee ring is strong, and the shape of a film formed after drying is concave;
(2) The volatilization speed of the solvent in the pixel pit 21 near the central area of the substrate is slow, the action time of capillary flow in the ink 3 is long, and the shape of the dried film is concave;
(3) The volatilization speed of the pixel pit 21 near the edge area of the substrate is high, the capillary flow is carried at the position with strong carrying effect, and the film in the same pixel pit 21 is thicker near the edge of the substrate and thinner near the center.
Accordingly, there is a need in the art for improvement.
Disclosure of Invention
The invention aims to provide a display device and a manufacturing method thereof, and aims to solve the problem of uneven film formation of the existing display device.
A method of fabricating a display device, comprising:
providing a substrate, wherein a pixel defining structure is arranged on the substrate, and the pixel defining structure encloses a plurality of pixel pits;
forming a filling groove on the top side of the pixel defining structure, wherein the filling groove is formed near each pixel pit;
printing ink into the pixel pits, and printing a vapor absorber into the filling grooves, wherein the boiling point of the vapor absorber is higher than that of a solvent of the ink, and the vapor absorber is used for absorbing vapor generated by volatilization of the solvent of the ink;
drying under reduced pressure to remove the solvent of the ink and the vapor absorber.
In one embodiment, the vapor absorber has a boiling point of 160 ℃ to 300 ℃.
In one embodiment, the vapor absorbent is selected from one or more of butylbenzene, p-isopropyltoluene, benzyl alcohol, phthalate esters, ethyl benzoate, 1, 3-trimethylcyclohexenone, N-methylpyrrolidone, 1, 3-dimethyl-2-imidazolidinone, sulfolane, diphenyl ether, dodecane, and glycerol.
In one embodiment, the solvent of the ink is selected from one or more of ethanol, butanone, cyclohexane, ethylene glycol dimethyl ether, isopropanol, toluene, butanol, xylene, anisole, cyclohexanone, and cyclohexanol.
In one embodiment, a plurality of the pixel pits are distributed in an array, and the filling grooves are arranged between two adjacent columns of the pixel pits.
In one embodiment, the filling grooves are stripe grooves and extend in the column direction of the pixel pits.
In one embodiment, the width of the filled trench is 50% -60% of the top side width of the pixel defining structure.
In one embodiment, the depth of the filled trench is 50% -90% of the height of the pixel defining structure.
In one embodiment, the vapor absorber is controlled to have a fill thickness of no more than 50% of the depth of the filled trench when printing the vapor absorber into the filled trench.
In one embodiment, the ink and the vapor absorber are printed simultaneously.
A display device manufactured by the manufacturing method of the display device of any one of the above embodiments.
Compared with the prior art, the display device and the manufacturing method thereof have the following beneficial effects:
according to the display device and the manufacturing method thereof, the filling groove is formed on the top side of the pixel defining structure, the solvent volatilized from the ink is absorbed by printing the steam absorbent in the filling groove, so that the concentration of the solvent steam around the pixel pit is reduced, and the volatilization rate of the ink is accelerated. Since the volatilization rate of the ink in the original pixel pit is affected by the concentration of the solvent vapor volatilized from the ink and accumulated around the ink, the accumulation of the solvent vapor in different areas on the substrate leads to different volatilization rates in different areas, and further leads to different film formation morphology. Therefore, the solvent vapor absorber absorbs the solvent vapor accumulated around the pixel pits, so that the concentration of the solvent vapor between different areas on the substrate tends to be uniform, and the uniformity of film formation in the pixel pits of different areas can be improved, thereby effectively improving the brightness or color coordinate difference (mura) caused by the regional film formation morphology difference, improving the display effect of the printed display panel and improving the device yield.
Drawings
FIG. 1 is a schematic diagram of a conventional method for fabricating a display device;
FIG. 2 is a cross-sectional view of the first state of FIG. 1 taken along the direction A-A;
FIG. 3 is a cross-sectional view of the second state of FIG. 1 taken along the direction A-A;
FIG. 4 is a schematic diagram of a method for fabricating a display device according to an embodiment;
FIG. 5 is a cross-sectional view of the first state of FIG. 4 in the direction B-B;
FIG. 6 is a cross-sectional view of the second state of FIG. 4 taken along the direction B-B;
fig. 7 is a cross-sectional view of the third state of fig. 4 in the direction B-B.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 4, the present invention provides a method for manufacturing a display device, which includes the following steps:
in step S110, a substrate 110 is provided.
Specifically, the substrate 110 has a TFT driving array thereon for driving the light emitting device to display an image. Alternatively, the substrate 110 may be a rigid substrate or a flexible substrate. The rigid substrate may be made of ceramic material or various glass materials. The flexible substrate may be a polyimide film (PI) and its derivatives, polyethylene naphthalate (PEN), phosphoenolpyruvic acid (PEP), or diphenylene ether resin, etc. The TFT driving array may include an amorphous silicon TFT array, a polycrystalline TFT array, a metal oxide TFT array, and the like.
The substrate 110 is provided with a pixel defining structure 120, and the pixel defining structure 120 encloses a plurality of pixel pits 130.
Each pixel pit 130 is used for injecting ink 200 of a corresponding color to form a pixel structure. It will be appreciated that the pixel pit 130 has an electrode at the lower portion thereof, and the injected ink 200 may contact the electrode.
In step S120, a filling trench 140 is formed on the top side of the pixel defining structure 120, and the filling trench 140 is formed in the vicinity of each pixel pit 130.
Specifically, forming the filling trench 140 on the top side of the pixel defining structure 120 may be, but is not limited to, by exposure, development etching, or the like.
Step S130, the ink 200 is printed into the pixel pit 130, and the vapor absorber 300 is printed into the filling groove 140. Wherein the boiling point of the vapor absorber 300 is higher than that of the solvent of the ink 200, and the vapor absorber 300 is used to absorb vapor generated by the volatilization of the solvent of the ink 200.
The boiling point of the vapor absorber 300 is higher than that of the solvent of the ink 200, the solvent in the ink 200 is volatilized in the inkjet printing process (in a natural state), the high boiling point of the vapor absorber 300 makes it not volatilized or volatilized little in the inkjet printing process (in a natural state), and the vapor absorber 300 can volatilize at a relatively high speed in a reduced pressure state such as a vacuum state. After printing the ink 200 and the vapor absorber 300, the vapor absorber 300 is a good solvent for the ink solvent, so that the volatilized solvent can be absorbed, and meanwhile, the volatilization rate of the ink 200 is accelerated due to the absorption effect of the vapor absorber 300, so that most of the solvent can be volatilized quickly no matter in a first printing area or a later printing area, and the shape in the pixel pit 130 is relatively fixed. The vapor absorber 300 absorbs the solvent vapor accumulated around the pixel pits 130, so that the concentration of the solvent vapor tends to be uniform among different areas on the substrate 110, the solvent evaporation rate of the ink 200 among the different areas tends to be uniform, and the uniformity of film formation in the pixel pits of the different areas is improved. In one embodiment, the ink solvent can volatilize a majority of the solvent within 120s to 180s due to the absorption of the vapor absorber 300, thereby fixing the film formation morphology.
In step S140, the ink 200 is dried under reduced pressure to remove the solvent and the vapor absorber 300.
Since the evaporation rate of the ink 200 in the pixel pit 130 is affected by the concentration of the solvent vapor evaporated from the ink 200 and accumulated around the ink, the accumulation of the solvent vapor in the first and second printed areas on the substrate 110 leads to different evaporation rates in different areas, and thus different film formation morphologies.
According to the invention, after the vapor absorber 300 absorbs most of the volatilized solvent, the shape in the pixel pit 130 is relatively fixed, then the vapor absorber absorbing the solvent is mainly removed by performing reduced pressure drying, and meanwhile, the remaining solvent in the pixel pit is removed, so that the uniformity of film formation in the pixel pit 130 in different areas can be improved, the brightness or color coordinate difference (mura) caused by the difference of regional film formation shapes can be effectively improved, the display effect of a printed display panel is improved, and the device yield is improved.
In one example, the vapor absorber 300 has a boiling point of 160 ℃ to 300 ℃. In one example, the boiling point of the vapor absorber 300 is 20-200 ℃ higher than the boiling point of the solvent of the ink 200. Further, in one example, the boiling point of the vapor absorber 300 is 30-100 ℃ higher than the boiling point of the solvent of the ink 200.
In one example, the vapor absorber 300 is selected from one or more of butylbenzene, p-isopropyltoluene, benzyl alcohol, phthalic acid esters, ethyl benzoate, 1, 3-trimethylcyclohexenone, N-methylpyrrolidone, 1, 3-dimethyl-2-imidazolidinone, sulfolane, diphenyl ether, dodecane, and glycerol.
In one example, the solvent of the ink 200 is selected from one or more of ethanol, butanone, cyclohexane, ethylene glycol dimethyl ether, isopropanol, toluene, butanol, xylene, anisole, cyclohexanone, and cyclohexanol.
In one example, the ink 200 includes at least one of a hole injection functional ink, a hole transport functional ink, a light emitting functional ink, an electron transport functional ink, and an electron transport functional ink. The vapor absorber 300 is printed into the filling tank 140 at the same time as each ink is printed.
In one example, the filling trench 140 extends along the extension direction of the pixel defining structure 120. In one example, a plurality of pixel pits 130 are distributed in an array, and a filled trench 140 is disposed between two adjacent columns of pixel pits 130 and/or between two adjacent rows of pixel pits 130.
In the specific example shown in fig. 4, the pixel pits 130 are distributed in an array, and a filling groove 140 is formed between two adjacent columns of pixel pits 130. Each of the filling grooves 140 is a stripe-shaped groove, and the filling groove 140 extends in the column direction of the pixel pit 130.
In one example, the width of the filled trench 140 is 50% -60% of the width of the top side of the pixel defining structure 120. In one specific example, the width of the filled trench 140 is 55% of the width of the top side of the pixel defining structure 120. In one example, the edges of the filled trench 140 are the same distance from the two-sided pixel pits 130, i.e., the filled trench 140 is centered on the top side of the pixel defining structure 120.
In one example, the depth of the filled trench 140 is 50% -90% of the height of the pixel defining structure 120. Further, in one example, the depth of the filled trench 140 is 60% -80% of the height of the pixel defining structure 120. In one specific example, the depth of the filled trench 140 is 70% of the height of the pixel defining structure 120.
In one example, the vapor absorber 300 is printed into the filling tank 140 such that the filling thickness of the vapor absorber 300 is controlled to be not more than 50% of the depth of the filling tank 140 to prevent the vapor absorber 300 from overflowing from the filling tank 140 after absorbing the solvent vapor volatilized from the ink 200. In one example, the vapor absorber 300 is controlled to have a fill thickness of 20% to 50% of the depth of the filled trench 140 when the vapor absorber 300 is printed into the filled trench 140. In one example, the vapor absorber 300 is controlled to have a fill thickness of 30% to 40% of the depth of the filled trench 140 when the vapor absorber 300 is printed into the filled trench 140.
In one example, the ink 200 and the vapor absorber 300 print simultaneously.
In one example, printing is performed using a printing device having a first printhead 410 and a second printhead 420, ink 200 is printed by the first printhead 410, and vapor absorber 300 is printed by the second printhead 420. In the particular example shown in the figures, the first printhead 410 and the second printhead 420 are positioned side-by-side and move in synchrony.
In one example, the method of fabricating a display device further includes a step of forming an electrode on the pixel structure after the reduced pressure drying step.
The method of manufacturing the display device of the present invention will be further described below with a specific example.
The method for manufacturing the display device of a specific example includes the following steps:
s1, as shown in FIG. 4, during the ink-jet printing process, a first printhead 410 deposits ink 200 in the pixel pits 130 and a second printhead 420 deposits solvent vapor absorber 300 in the fill grooves 140;
s2, as shown in FIG. 5, after the ink 200 is deposited, the solvent of the ink 200 in the pixel pit 130 begins to volatilize, and the solvent vapor generated by the volatilization is absorbed by the vapor absorber 300;
s3, after the ink-jet printing, directly transferring the substrate 110 into a decompression drying chamber, and performing the ink-jet printing at the temperature of 1 multiplied by 10 -6 Maintaining the substrate 110 for 120-240 s under the condition of torr, drying the substrate 110 under reduced pressure, and placing the substrate in the pixel pit 130 in FIG. 6A small portion of the solvent remaining in the ink 200 is evaporated together with the solvent vapor absorber 300 having an increased volume due to the absorption of the ink 200, to finally obtain a uniform thin film 310 as shown in fig. 7.
Further, the invention also provides a display device, which is manufactured by the manufacturing method of the display device of any example.
The display device may be an OLED display device, a QLED display device, or the like.
In the display device and the method for manufacturing the same, the filling grooves 140 are formed on the top side of the pixel defining structure 120, and the vapor absorber 300 is printed in the filling grooves 140 to absorb the solvent volatilized from the ink 200, so that the concentration of the solvent vapor around the pixel pits 130 is reduced, and the volatilization rate of the ink 200 is increased. Since the evaporation rate of the ink 200 in the pixel pit 130 is affected by the concentration of the solvent vapor evaporated from the ink 200 and accumulated around the ink, the accumulation of the solvent vapor in different areas on the substrate 110 leads to different evaporation rates in different areas, and thus different film formation morphology. Therefore, the solvent vapor absorber 300 absorbs the solvent vapor accumulated around the pixel pits 130, so that the concentration of the solvent vapor tends to be uniform between different areas on the substrate 110, and the uniformity of film formation in the pixel pits 130 in different areas can be improved, so that the brightness or color coordinate difference (mura) caused by the regional film formation morphology difference can be effectively improved, the display effect of the printed display panel is improved, and the device yield is improved.
In addition, the evaporation rate of the ink 200 is increased by the absorption of the vapor absorber 300, and most of the solvent can be evaporated within 120 to 180 seconds in both the first printing region and the second printing region, so that the film formation morphology is fixed.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (11)
1. A method of manufacturing a display device, comprising the steps of:
providing a substrate, wherein a pixel defining structure is arranged on the substrate, and the pixel defining structure encloses a plurality of pixel pits;
forming a filling groove on the top side of the pixel defining structure, wherein the filling groove is formed near each pixel pit;
printing ink into the pixel pits, and printing a vapor absorber into the filling grooves, wherein the boiling point of the vapor absorber is higher than that of a solvent of the ink, and the vapor absorber is used for absorbing vapor generated by volatilization of the solvent of the ink;
drying under reduced pressure to remove the solvent of the ink and the vapor absorber.
2. The method of manufacturing a display device according to claim 1, wherein the vapor absorber has a boiling point of 160 ℃ to 300 ℃.
3. The method of manufacturing a display device according to claim 2, wherein the vapor absorber is selected from one or more of butylbenzene, p-isopropyltoluene, benzyl alcohol, phthalic acid ester, ethyl benzoate, 1, 3-trimethylcyclohexenone, N-methylpyrrolidone, 1, 3-dimethyl-2-imidazolidinone, sulfolane, diphenyl ether, dodecane, and glycerol.
4. The method of manufacturing a display device according to claim 3, wherein the solvent of the ink is one or more selected from the group consisting of ethanol, butanone, cyclohexane, ethylene glycol dimethyl ether, isopropanol, toluene, butanol, xylene, anisole, cyclohexanone, and cyclohexanol.
5. The method of manufacturing a display device according to claim 1, wherein a plurality of the pixel pits are arranged in an array, and the filling grooves are provided between two adjacent columns of the pixel pits.
6. The method of manufacturing a display device according to claim 5, wherein the filling grooves are stripe grooves and extend in a column direction of the pixel pits.
7. The method of manufacturing a display device of claim 1, wherein the width of the filling trench is 50% to 60% of the width of the top side of the pixel defining structure.
8. The method of manufacturing a display device according to claim 1, wherein the depth of the filling trench is 50% to 90% of the height of the pixel defining structure.
9. The method of manufacturing a display device according to claim 1, wherein a filling thickness of the vapor absorber is controlled to be not more than 50% of a depth of the filling groove when the vapor absorber is printed into the filling groove.
10. The method of manufacturing a display device according to any one of claims 1 to 9, wherein the ink and the vapor absorber are printed simultaneously.
11. A display device manufactured by the manufacturing method of the display device according to any one of claims 1 to 10.
Priority Applications (1)
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| CN115377334A (en) * | 2021-07-28 | 2022-11-22 | 广东聚华印刷显示技术有限公司 | Method for preparing light-emitting device |
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