CN108944033A - Printing equipment and printing process - Google Patents
Printing equipment and printing process Download PDFInfo
- Publication number
- CN108944033A CN108944033A CN201711010198.1A CN201711010198A CN108944033A CN 108944033 A CN108944033 A CN 108944033A CN 201711010198 A CN201711010198 A CN 201711010198A CN 108944033 A CN108944033 A CN 108944033A
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- China
- Prior art keywords
- printing
- vacuum drying
- print head
- printing equipment
- mobile drive
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0022—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using convection means, e.g. by using a fan for blowing or sucking air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
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- 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
Abstract
The present invention relates to one kind to state printing equipment and printing process.The printing equipment includes printing mechanism and vacuum drying mechanism, and wherein printing mechanism includes print head and mobile drive deivce, and print head connect with mobile drive deivce and can be driven by mobile drive deivce and moved；It is dried in vacuo mechanism and is equipped with bleeding point, vacuum drying mechanism connect with mobile drive deivce and can be driven by mobile drive deivce with print head synchronizing moving side to realize that the ink to printing carries out step-by-step movement vacuum drying.The printing equipment can be improved the uniformity finally to form a film, and can greatly shorten entire printing technology process, reduce production cost, and improve printing production efficiency, increase element manufacturing yield, and enhance device performance.
Description
Technical field
The present invention relates to display production equipment fields, more particularly to a kind of printing equipment and printing process.
Background technique
With the gradually development of display technology, the devices such as OLED obtain the concern of each side because of its excellent display performance.Often
Rule make the problems such as luminescent devices such as OLED face low stock utilization, needs hyperfine exposure mask using vapor deposition mode, cause to give birth to
Produce higher cost.For the production cost for further decreasing the luminescent devices such as OLED, the devices such as printing technology production OLED can be used.
After being exactly inkjet printing functional material ink using one of printing technology production crucial problem of devices such as OLED
Drying and forming-film process, which directly affects the show uniformity of device, service life etc..In general, in printing technology
It is dried to property is disposably printed after functional material ink again by being dried in vacuo (Vacuum Dry, VD) technology
Film forming.However, the disposal vacuum drying process has the following problems:
(1) make whole drying process complicated, inefficiency.This is because most luminescent devices need to carry out repeatedly difference
The printing process of functional material ink also just needs the process of repeatedly vacuum drying with vacuum breaker printing, it is clear that increase system
Make process quantity.
(2) the vacuum drying technique of property is easy to cause in the production to middle larger display panels again after finishing printing
Form a film uneven phenomenon.This is because being easy that there are biggish vapour pressure differences in the top of large-scale printed patterns, to lead
The problem of causing pixel film forming extremely unevenness at pattern edge region and forming mura (halo of many colours).This does not only result in the property of luminescent device
It can decline, while also make product competitiveness not strong.
Summary of the invention
Based on this, it is necessary to for providing a kind of printing equipment that can be improved into film uniformity and production efficiency and printing
Method.
A kind of printing equipment, for the production of luminescent device, the printing equipment includes printing mechanism and vacuum drier
Structure；
The printing mechanism includes print head and mobile drive deivce, and the print head and the mobile drive deivce connect
It connects, the print head can be driven mobile to realize step-by-step movement inkjet printing by the mobile drive deivce；
The vacuum drying mechanism is equipped with bleeding point, and vacuum drying mechanism with air extractor for connecting, the vacuum
Drier is connect with the mobile drive deivce, and the vacuum drying mechanism can be driven by the mobile drive deivce and institute
Print head synchronizing moving is stated to carry out step-by-step movement vacuum drying to the ink just printed.
The printing equipment further includes Feng Lin mechanism in one of the embodiments,；
The Feng Lin mechanism is equipped with air inlet, and the Feng Lin mechanism with air supply source for connecting, Feng Lin mechanism position
Between the print head and the vacuum drying mechanism, the Feng Lin mechanism connect with the mobile drive deivce and can be by
The mobile drive deivce driving compensates the air-flow taken away by the vacuum drying mechanism with the print head synchronizing moving.
The Feng Lin mechanism is arranged close to the vacuum drying mechanism in one of the embodiments,.
The mounting height of the mounting height of the Feng Lin mechanism and the vacuum drying mechanism in one of the embodiments,
It is identical.
The air inlet has multiple in one of the embodiments,；And/or the bleeding point have it is multiple.
The mounting height of the vacuum drying mechanism is greater than the peace of the nozzle of the print head in one of the embodiments,
Dress height.
The width of the print head of the width not less than 1.5 times of the vacuum drying mechanism in one of the embodiments,
Degree；And/or the length of the vacuum drying mechanism is greater than the width of the vacuum drying mechanism.
The printing equipment further includes the workbench for placing workpiece to be added, the work in one of the embodiments,
Make the lower section that platform is set to the print head.
The workbench is inhaled equipped with vacuum in one of the embodiments,；And/or
The printing equipment further includes rotation drive device, and the workbench is connect with the rotation drive device, described
Workbench can be driven by the rotation drive device and be rotated.
A kind of printing process, includes the following steps:
Step-by-step movement inkjet printing is carried out to machined part, and makes to be dried in vacuo mechanism described in during inkjet printing
The moving direction of print head is mobile and carries out step-by-step movement vacuum drying to the functional ink just printed.
Above-mentioned printing equipment includes printing mechanism and vacuum drying mechanism, wherein printing mechanism includes print head and movement
Driving device, print head are connect with mobile drive deivce, and print head can be driven mobile to realize stepping by mobile drive deivce
Formula inkjet printing；It is dried in vacuo mechanism and is equipped with bleeding point, vacuum drying mechanism with air extractor for connecting for fighting each other
The removal for the solvent that ink volatilizees during print, vacuum drying mechanism connect with mobile drive deivce and can be with the print heads
Synchronizing moving is to carry out step-by-step movement vacuum drying to the ink just printed.The devices such as OLED are carried out using above-mentioned printing equipment
When printing production, it can be realized inkjet printing and vacuum drying while progress, can realize that vacuum is pre- in inkjet printing
It is dry, have on the whole following aspect the utility model has the advantages that
(1) above-mentioned printing equipment can greatly shorten entire printing technology process, reduce process flow number, and it is multiple to reduce technique
Miscellaneous degree reduces production cost, and improves printing production efficiency.
(2) it is carried out since process of vacuum drying follows ink jet printing process step-by-step movement closely, above-mentioned printing equipment can eliminate base
The solvent steam concentration of plate edge and center position is poor, so can be avoided large-size substrate wait workpiece edge at
The non-uniform phenomenon of film improves the uniformity finally to form a film.
(3) particularly with the more situation of stamping ink water on substrate is needed, stepping is carried out using above-mentioned printing equipment
The vacuum drying mode of formula can effectively reduce the ink volume in pixel hole, wait workpiece whole so as to reduce substrate
Vapour pressure difference on version surface, also can reduce the mobility before ink is completely dried simultaneously, and then be conducive to finally form a film
Uniformity, reduce the generation of mura.
(4) compared with carrying out the dry mode of disposal vacuum again after traditional disposable printing, due to process of vacuum drying
It follows the progress of ink jet printing process step-by-step movement closely, the solvent in most of marking ink can be extracted in time, reduce print procedure
The pollution that middle solvent volatilizees to environment.
(5) used by the disposal vacuum drying process compared with vacuum dryer, above-mentioned printing equipment be can reduce
Requirement to vacuum dryer, i.e., it is lower to the requirement of vacuum degree, it can reduce equipment cost, and improve print production effect
Rate.
(6) above-mentioned printing equipment can be realized substrate and do not move in printing process, by vacuum drying mechanism and printing
The synchronizing moving of head realizes the process of step-by-step movement drying and forming-film, can further avoid causing when multiple transfer base substrate in pixel hole
Mura caused by ink flow further increases the uniformity finally to form a film, and improves quality of forming film.
Further, above-mentioned printing equipment further includes Feng Lin mechanism, and for providing air-flow, supplement is dried under vacuum mechanism pumping
The air-flow walked maintains the balance and stabilization of atmosphere above workbench.During inkjet printing and drying, vacuum drying
Mechanism and Feng Lin mechanism can match, and maintain the stable gas pressure of whole printing process, can be further ensured that and improve film forming
Quality, and can reduce the requirement to vacuum dryer, to realize improvement and optimize film-formation result, it is good to increase element manufacturing
Rate, and enhance device performance.
Above-mentioned printing process is dry by carrying out step-by-step movement vacuum to the ink for having completed printing while inkjet printing
Dry, i.e., vacuum drying mechanism of the ink just printed by subsequent movement to this carries out the drying process with position.Side printing
The dry mode in side can almost synchronously complete the predrying of entire substrate after the inkjet printing for completing entire substrate
Journey greatly shortens entire printing drying process.This step-type printing drying mode can reduce printing solvent volatilization and cause
Pollution, it is similar large-size substrate is resolved into multiple small substrates to be dried, can reduce the steam of different parts on substrate
Pressure difference improves the uniformity of film forming.Meanwhile in entire printing process, it is to be processed that above-mentioned printing process can be realized substrate etc.
Part does not move, and by vacuum drying mechanism with the process of the mobile realization step-by-step movement drying and forming-film of print head, beats after the completion of printing
Printing ink substantially dry, then the substrate printed is subjected to transfer and subsequent processing, this also reduces black in subsequent shifting pixel
Mura caused by water flowing further increases the uniformity finally to form a film.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of an angle of the printing equipment of an embodiment；
Fig. 2 is the structural schematic diagram of another angle of the printing equipment in Fig. 1；
Fig. 3 is the process status schematic diagram that embodiment 1 is printed using the printing equipment in Fig. 1；
Fig. 4 is the process status schematic diagram that embodiment 2 is printed using the printing equipment in Fig. 1.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more thorough
Comprehensively.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Incorporated by reference to Fig. 1 and Fig. 2, the printing equipment 10 of an embodiment, including workbench 100, printing mechanism 200, vacuum
Drier 300 and Feng Lin mechanism 400.
In the present embodiment, workbench 100 is for placing workpiece to be added.When product to be processed is OLED, QLED etc.
When device, which can be substrate.
In the present embodiment, it is preferable that workbench 100 is inhaled equipped with vacuum.Specifically, for putting on workbench 100
The peripheral portion for setting substrate is equipped with vacuum suction, and for substrate to be fixed, and this kind of fixed form be not by external air flow
Influence, can be realized to the firm fixation of substrate.The shape of workbench 100 can be unrestricted, such as cuboid etc..?
In other embodiments, wait the fixation of workpiece that can also use the modes such as other modes, such as clamping substrate.
In the present embodiment, further, printing equipment 10 further includes that the rotation that workbench 100 can be driven to rotate is driven
Dynamic device (being not drawn into figure).The rotation drive device can be convenient for the picture on the accurate counterpart substrate of nozzle on print head 210
Element hole.In other embodiments, when print head 210 can move and realize the hole of the pixel on accurate counterpart substrate, the use
Rotating rotation drive device in driving workbench 100 can be not provided with.But in terms of operating conveniently, it is arranged for driving workbench
The rotation drive device device of 100 rotations is more conducive to subsequent to other operations such as transfer of substrate.Rotation drive device can
To include the motor etc. of the shaft being connect with workbench 100 and drive shaft rotation.
In the present embodiment, printing mechanism 200 includes print head 210 and mobile drive deivce.
Specifically, print head 210 has nozzle, and the placement surface of the corresponding workbench 100 in the ink-jet area 211 of print head 210 is set
It sets.Print head 210 is set to the top of workbench 100, and print head 210 is connect for continuing to supply to printing 210 with ink inlet tube 220
Answer ink.Print head 210 is located on mobile drive deivce, and print head 210 can be driven by mobile drive deivce it is mobile with
It realizes and ink-jet is pinpointed to workpieces such as substrates.
Mobile drive deivce includes moveable support 250 and drives the driving device of the movement of moveable support 250 (in figure not
It draws).Print head 210 is arranged on moveable support 250.
In the present embodiment, vacuum drying mechanism 300 is connect with moveable support 250, and vacuum drying mechanism 300 is used for
Air extractor connection.Vacuum drying mechanism 300 can be driven with 210 synchronizing moving of print head by mobile drive deivce to realize pair
The ink of printing carries out step-by-step movement vacuum drying, i.e. the vacuum predrying in inkjet printing.It is dried in vacuo mechanism 300 and print head
210 are arranged on moveable support 250, can simplify apparatus structure, save space, and be easy to operate.Vacuum drying
The exhaust pipe 320 that mechanism 300 is equipped with multiple bleeding points and is connected respectively with multiple bleeding points, exhaust pipe 320 are used for
It is connected with air extractor.The direction of dotted arrow just as shown in figure 1, bleeding point are used to volatilize to ink during printing molten
The removal of agent.In fact, the setting quantity of bleeding point can be one, 20,50,80 and 200 etc., only
It can satisfy the requirement of predrying or the drying to the ink of different area.
In other embodiments, it when not needing vacuum drying mechanism 300 and 210 synchronizing moving of print head, can will be directed to
Mobile drive deivce is separately provided in vacuum drying mechanism 300, realizes the shifting respectively to vacuum drying mechanism 300 and print head 210
The independent regulation of dynamic speed.
In the present embodiment, it is preferable that the mounting height of vacuum drying mechanism 300 is greater than the nozzle of print head 210
Mounting height.Further, the width for being dried in vacuo effective vacuum drying region of mechanism 300 is WVD, WVDGreater than print head
210 print span WIJP.Further, in order to guarantee to be dried in vacuo effect, vacuum drying mechanism 300 is effectively evacuated range
The width of print head of the width not less than 1.5 times.Vacuum drying length LVDIt may be slightly larger than vacuum drying width, in order to guarantee
Effective vacuum drying regional scope, can use 3WVD≥LVD≥2WVD。
In addition, further, in order to avoid being dried in vacuo mechanism 300 in pumping to 210 nozzle ink jet angle of print head
Influence, vacuum drying mechanism 300 needs maintained a certain distance with workpiece to be added.For OLED device, it is dry to can adjust vacuum
Height of the dry mechanism 300 from workbench 100 is 3cm.In other embodiments, it can also be adjusted according to the actual situation.
Further, it is controllable for being dried in vacuo the speed of evacuation of mechanism 300.The size of its speed of evacuation depends on printing
Ink volume and dicyandiamide solution property.If the volume of marking ink is bigger, boiling point is higher, mechanism will be dried in vacuo
300 speed of evacuation is correspondingly arranged bigger.
In the present embodiment, Feng Lin mechanism 400 is set on moveable support 250 and is located at print head 210 and vacuum is dry
Between dry mechanism 300.Feng Lin mechanism 400 is used to be dried under vacuum what mechanism 300 took away with 210 synchronizing moving of print head to compensate
Air-flow.
Further, Feng Lin mechanism 400 is identical as the vacuum drying mounting height of mechanism 300, that is, is located at same level
On, and the distance between the two and workbench 100 are not less than at a distance from the nozzle and workbench 100 of print head 210.Preferably,
Altitude range of the Feng Lin mechanism 400 apart from substrate is 2~4mm.Further, Feng Lin mechanism 300 is slightly biased to vacuum drying mechanism
300 settings, further decrease influence of the air-flow to 210 ink ejection stability of print head.
In the present embodiment, specifically, Feng Lin mechanism 400 is equipped with multiple air inlets, and multiple air inlets correspond to work
The placement surface of platform 100 is arranged.Feng Lin mechanism 400 by supply air line 420 with air supply source for being connected, for providing air-flow,
Compensation is dried under vacuum the solvent gas that mechanism 300 takes away, maintains atmosphere balance above substrate.Gas source preferably not with ink
Inert gas that water reacts, such as the nitrogen of high-purity etc..The air-flow size of Feng Lin mechanism 400 is controllable.For OLED material
The gas source of Material system, preferably nitrogen as Feng Lin mechanism 400 is conducive to reduce device performance, the decaying in service life.The number of air inlet
Amount, which also can according to need, to be adjusted, such as one, 20,50,100 etc..Carrying out the device fabrications such as OLED
When, charge air flow is adjustable whole to identical as the vacuum drying speed of evacuation of mechanism 300.When in the production of product without treating
Workpiece can still have in the case where corresponding to air flow compensation it is good at film uniformity when, which can omit
Setting.
It is appreciated that in other embodiments, volatilizing to make to reduce solvent in ink in printing process to workshop
Pollution, can surround sealable system by partition for entire printing equipment 10, and then can further increase the quality of product,
And the service life for being able to extend air extractor etc., and gas source supply is saved, while also can be avoided and damage is generated to human body.
When carrying out luminescent device production using printing equipment 10, have the advantage that (1) synchronizes the ink of printing
Forevacuum be dried, can greatly shorten entire printing technology process, reduce process flow number, reduce complex process journey
Degree reduces production cost, and improves printing production efficiency；(2) since process of vacuum drying follows ink jet printing process step-by-step movement closely
Ground carries out, and the printing equipment 10 of present embodiment can eliminate the solvent steam concentration of substrate edges position and center position
Difference, and then can be avoided large-size substrate and wait the non-uniform phenomenon of workpiece edge film forming, the uniformity finally to form a film is improved,
Improve and optimize film-formation result, has the function that increase element manufacturing yield, enhancing device effect；(3) it is for needing in base
The more situation of stamping ink water on plate carries out the vacuum drying mode of step-by-step movement using the printing equipment 10 of present embodiment,
The ink volume in pixel hole can be reduced, effectively so as to reduce the steam pressure difference on substrate waiting workpiece full page surface
It is different, the mobility before ink is completely dried also can be reduced simultaneously, and then be conducive to the uniformity finally to form a film, reduce mura's
It generates；(4) compared with carrying out the dry mode of disposal vacuum again after traditional disposable printing, since process of vacuum drying follows closely
Ink jet printing process steppingly carries out, and can extract the solvent in most of marking ink in time, reduces solvent volatilization pair
The pollution of environment；(5) used by the disposal vacuum drying process compared with vacuum dryer, the printing of present embodiment is filled
Setting 10 can reduce requirement to vacuum dryer, i.e., lower to the requirement of vacuum degree, can reduce equipment cost, and improve
Printing production efficiency.
A kind of printing process includes the following steps: to carry out step-by-step movement inkjet printing to the workpiece to be added that is placed on workbench,
It moves vacuum drying mechanism along the moving direction of print head and stepping is carried out to the ink after printing
Formula vacuum drying.The vacuum drying printing process of the step-by-step movement can substantially reduce reduction printing-flow, reduce production cost,
And improve printing production efficiency, while can farthest predrying or dry ink, reduce ink flow, be conducive to most
The uniformity to form a film eventually improves the performance of device.
Specifically, the printing equipment 10 that present embodiment can be used is printed, and printing process includes the following steps:
Substrate to be printed is placed on workbench 100, substrate is fixed in vacuum suction, by print head 210 to passing through base
The pixel of plate cheat in inkjet printing, and make under the driving of mobile drive deivce to be dried in vacuo mechanism 300, Feng Lin mechanism 400 with
The synchronizing moving of print head 210 simultaneously carries out step-by-step movement vacuum drying to the ink printed.
Above-mentioned printing process is while inkjet printing by carrying out step-type vacuum to the ink for having completed printing
It is dry, i.e., it is dried in printing；Vacuum drying mechanism 300 of the ink just printed by subsequent movement to this carries out same position
It is dried.In the drying process, N sprays in the Feng Lin mechanism 400 being dried in vacuo between mechanism 300 and print head 2102Air-flow,
The air-flow for the solvent that supplement vacuum drying mechanism 300 takes away, maintains the stable gas pressure of entire printing equipment 10.In this way, printer
After structure 200 completes the inkjet printing of entire substrate, the pre-drying process of entire substrate has almost been synchronously completed, has been substantially reduced whole
A printing-flow.This step-type printing drying mode reduces pollution caused by printing solvent volatilization, similar by large scale
Substrate resolves into multiple small substrates and is dried, and reduces intermediate and steam pressure difference, improves the uniformity of film forming.Meanwhile
In entire printing process, it is dried in vacuo mechanism 300 and Feng Lin mechanism 400 is moved with the movement of print head 210, it is to be printed
Substrate then remains stationary, marking ink substantially dry after the completion of printing, then carries out the mechanism arrangements such as thimble, manipulator, conveyer belt
Transfer and subsequent processing are carried out to the substrate printed, this also reduces mura caused by ink flow in subsequent shifting pixel,
The uniformity for guaranteeing film forming, enhances product performance.
Below by taking print head 210 is using Fujifilm Sapphire QS-256/10AAA spray head as an example, to using this reality
The process for applying the progress parameter setting of printing equipment 10 of mode is illustrated.
The nozzle number of Fujifilm Sapphire QS-256/10 AAA spray head is 256, in order to completely eliminate between nozzle
Cross talk effects (Cross talk), distance is 254 μm between adjacent nozzle.The effective printing zone of the spray head most width be (256 ×
254)/1000≈65mm。
For security consideration, the arid region width for being dried in vacuo mechanism 300 is no less than 130mm.Vacuum drier
The arid region length of structure 300 should be between 130mm to 195mm.Interval between vacuum drying mechanism 300 and spray head is chosen as
3cm。
Assuming that printing is one long: the OLED device of the RGB SBS of 32 cun of FHD of wide=4:3, sub-pixel size are not more than
339 151 μm of μ ms (containing BM and TFT zone), the distance of jet speed v=6m/s, spray head apart from substrate are d, d=1.5mm,
And safe avoidance distance is L=20 μm.Using single Fujifilm Sapphire QS-256/10 AAA spray printing.Then spray head is horizontal
To movement speed are as follows:
It is then dried in vacuo 300 movement speed of mechanism and is also equal to 80mm/s.
Then 32 cun of unidirectional print stroke time-consumings are 6.1s.Assuming that reset and repositioning time are consistent with single direction stroke, and can
To complete the second printing, then secondary total trip time is 12.2s twice.Since the spray head distance is far longer than adjacent two sub-pixel
Spacing realizes that nozzle can be located at the top in pixel hole so substrate needs the rotation (Rotating Angle) of certain angle.This
When assume each one column pixel of correspondence of each nozzle, then spray head needs the angle that rotates are as follows:
And reciprocating stroke can complete 2 printings, i.e. 256 × 2=512 sub-pixel every time.In order to print entire screen
Curtain needs the number of strokes of walking are as follows:
Because the integral multiple that stroke is 0.5, needs 11.5 strokes.It can be seen that being printed using single nozzle
Under the conditions of it is time-consuming to complete full page printing is 140.3s, about 2 minutes 20s.It knows in the ideal case, the functions such as printing HIL or HTL
Layer needs 2 points of 20s.
In usual ink injection to pixel hole, the volume of its flowing is variation when liquid internal flows before being completely dried
's.Description liquid motion cannot be removed with the formula of classical mechanics at this time.If considering, liquid is incompressible, and the flowing of liquid internal can
To be described with Navier-Stoke hydrodynamics formula:
Wherein ρ is fluid density；V is flowing velocity；P is pressure；Represent the viscosity of liquid；F represents other field of forces
Effect to liquid flowing.Left side of the equal sign is the effect of inertial force field in formula, whereinUnstable acceleration is represented, andFor convective acceleration；Right side of the equal sign is the stress field of force in formulaWith the effect of remaining field of force F, force is being answered
Further it is divided into barometric gradient component-inWith viscosity component
Navier-Stoke formula calculates complicated and is difficult to solve in practice, so can carry out herein to formula key factor
Ratio enlargement influences the factor of liquid flowing to study.Can have after prime formula is simplified:
If fluid flow be Q, liquid level flow distance be e, mean flow rate v, viscosity η, simultaneouslyRepresentative is being flowed
The motive force provided on per unit length on direction, then:
E can represent liquid thickness when liquid is relatively thin, it is known that flow Q and e3It is directly proportional, and be inversely proportional with viscosity η.
Then in quick volatilization, raising liquid viscosity rapidly and thickness can be reduced, so as to avoid subsequent liquid
Transverse shifting problem reduces the inhomogeneities that forms a film in pixel.
Further below in conjunction with specific embodiments, the printing effect situation of printing equipment of the invention is done and is further said
It is bright.
The case where printing a small amount of ink in 1 pixel of embodiment hole
Please further combined with Fig. 3, the functional layer relatively thin for film forming thickness, such as the material of film forming thickness about 20nm~30nm
Material.Generally in a sub-pixel, make print head 210 with the speed spray printing of the every drop of 10pl, it is only necessary to 5 to 8 melted inks (80pl with
Under), its liquid level is relatively thin at this time.After the printing of print head 210, ink is fallen into the pixel hole 3 that pixel defining layer 2 surrounds, and is carried out
It is distributed and sprawls, and then vacuum drying mechanism 300 is moved to this overlying regions and is dried in vacuo to it.
At this point, surface area is larger and readily volatilized since ink is less, lateral flow of the ink in pixel hole 3 compared with
It is small.Advance as vacuum drying mechanism 300 is mobile, ink can be completely dried film forming in pixel hole 3.After to be printed, base
The drying and forming-film process of plate 1 is also completed, and can be directly entered in baking oven and be carried out further crosslinking curing.
The case where printing a large amount of inks in 2 pixel of embodiment hole
Please further combined with Fig. 4, the functional layer thicker for film forming thickness, such as the material of film forming thickness about 40nm-80nm
Material.Generally in 1 sub-pixel, print head 210 needs 10 to 18 melted inks, its liquid level is thicker at this time with the every drop spray printing of 10pl.?
Ink is fallen into the pixel hole 3 surrounded by pixel defining layer 2 after spray head printing, is distributed and is sprawled, at this time ink thickness be e1 and
Viscosities il 1, then ink transverse direction flow is Q1 at this time.Because ink is thicker, lateral flow Q1 is very big, is easy to cause ink film forming not
?.
Because ink is more, volatilization is more difficult.Then when being dried in vacuo the process that mechanism 300 advances, ink in pixel hole 3
Most of drying and forming-film may be implemented.
After vacuum drier 300 is walked, remaining ink thickness is e2 in pixel hole 3, and viscosity is η 2, ink
Lateral flow is Q2.Have after being dried in vacuo by stepping: e1> 2e2；η12 η of >2。
ThenInk transverse flow momentum is greatly reduced at this time, can be avoided because of lateral flow bring film forming not
Equal problem.After to be printed, because solvent storage is few, substrate 1 can be directly entered baking oven and carry out crosslink material solidification.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of printing equipment, the production for luminescent device, which is characterized in that including printing mechanism and vacuum drying mechanism；
The printing mechanism includes print head and mobile drive deivce, and the print head is connect with the mobile drive deivce, institute
Stating print head can drive movement to realize step-by-step movement inkjet printing by the mobile drive deivce；
The vacuum drying mechanism is equipped with bleeding point, and vacuum drying mechanism with air extractor for connecting, the vacuum drying
Mechanism is connect with the mobile drive deivce, and the vacuum drying mechanism can be driven by the mobile drive deivce and be beaten with described
Print head synchronizing moving is to carry out step-by-step movement vacuum drying to the ink just printed.
2. printing equipment according to claim 1, which is characterized in that further include Feng Lin mechanism；
The Feng Lin mechanism is equipped with air inlet, and for connecting with air supply source, the Feng Lin mechanism is located at institute for the Feng Lin mechanism
It states between print head and the vacuum drying mechanism, the Feng Lin mechanism connect with the mobile drive deivce and can be by described
Mobile drive deivce driving compensates the air-flow taken away by the vacuum drying mechanism with the print head synchronizing moving.
3. printing equipment according to claim 2, which is characterized in that the Feng Lin mechanism is close to the vacuum drying mechanism
Setting.
4. printing equipment according to claim 3, which is characterized in that the mounting height and the vacuum of the Feng Lin mechanism
The mounting height of drier is identical.
5. printing equipment according to claim 2, which is characterized in that the air inlet has multiple；And/or the bleeding point
Have multiple.
6. printing equipment according to claim 1, which is characterized in that the mounting height of the vacuum drying mechanism is greater than institute
State the mounting height of the nozzle of print head.
7. printing equipment according to claim 1, which is characterized in that the width of the vacuum drying mechanism is not less than 1.5
The width of the print head again；And/or the length of the vacuum drying mechanism is greater than the width of the vacuum drying mechanism.
8. printing equipment according to any one of claims 1 to 7, which is characterized in that further include for placing workpiece to be added
Workbench, the workbench be set to the print head lower section.
9. printing equipment according to claim 8, which is characterized in that the workbench is inhaled equipped with vacuum；And/or
It further include rotation drive device, the workbench is connect with the rotation drive device, and the workbench can be by described
Rotation drive device driving rotation.
10. a kind of printing process, which comprises the steps of:
Step-by-step movement inkjet printing is carried out to machined part, and makes to be dried in vacuo mechanism along the printing during inkjet printing
The moving direction of head is mobile and carries out step-by-step movement vacuum drying to the functional ink just printed.
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| CN201711010198.1A CN108944033B (en) | 2017-10-25 | 2017-10-25 | Printing apparatus and printing method |
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| CN201711010198.1A CN108944033B (en) | 2017-10-25 | 2017-10-25 | Printing apparatus and printing method |
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| CN108944033B CN108944033B (en) | 2020-07-31 |
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| CN111038114A (en) * | 2019-11-13 | 2020-04-21 | 深圳市华星光电半导体显示技术有限公司 | Ink-jet printing device and method for preparing organic light-emitting diode display panel |
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