CN111516391A

Movatterモバイル変換

Info

Publication number: CN111516391A
Application number: CN202010328451.3A
Authority: CN
Inventors: 赵金阳
Original assignee: TCL China Star Optoelectronics Technology Co Ltd
Current assignee: TCL China Star Optoelectronics Technology Co Ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-08-11
Anticipated expiration: 2040-04-23
Also published as: CN111516391B

Abstract

The application provides an ink jet printing device and an ink jet printing method. The inkjet printing apparatus includes: the printing device comprises a spray head, a bracket for fixing the spray head and a first electrode positioned on the bracket or the spray head, wherein the spray head and the first electrode are positioned on one side of the bracket close to a substrate to be printed; the first electrode and a second electrode on the ink-jet printing device or a third electrode on the substrate to be printed form a printing electric field, and the printing electric field is used for enabling solutes in ink to be uniformly distributed on the substrate to be printed. This application forms the printing electric field through first electrode and second electrode or first electrode and third electrode, makes the solute in the ink evenly distributed on waiting to print the base plate under the effect of electric field, has avoided the production of coffee ring effect, has improved product quality.

Description

Ink jet printing apparatus and ink jet printing method

Technical Field

The present disclosure relates to display devices, and particularly to an inkjet printing apparatus and an inkjet printing method.

Background

With the rapid development of display products, people are continuously and deeply developing the manufacturing process of the display products, and the inkjet printing attracts people's extensive attention as a patterning technology which does not need vacuum, can be directly patterned, and has low temperature and low cost.

After the existing ink-jet printing device ejects ink, due to the coffee ring effect, the deposition of solute in the ink on the substrate to be printed is not uniform, and the quality of a display product applying the substrate to be printed is influenced.

Therefore, a new inkjet printing apparatus and inkjet printing method are needed to solve the above technical problems.

Disclosure of Invention

The application provides an ink-jet printing device and an ink-jet printing method, which are used for solving the problem that the quality of a product is influenced because solutes in the ink are deposited unevenly on a substrate to be printed due to the coffee ring effect after the ink is printed on the substrate to be printed by the existing ink-jet printing device.

In order to solve the technical problem, the technical scheme provided by the application is as follows:

the application provides an ink-jet printing device, which comprises a spray head, a bracket for fixing the spray head and a first electrode positioned on the bracket or the spray head, wherein the spray head and the first electrode are positioned on one side of the bracket close to a substrate to be printed;

the first electrode and a second electrode on the ink-jet printing device or a third electrode on the substrate to be printed form a printing electric field, and the printing electric field is used for enabling solutes in ink to be uniformly distributed on the substrate to be printed.

In the inkjet printing device provided by the application, the nozzle protrudes out of the bracket and extends towards the substrate to be printed, and the first electrode is positioned on the surface of the nozzle.

In the inkjet printing device that this application provided, the shower nozzle embedded in on the support, the spout of shower nozzle does not exceed the support is close to wait to print the first surface of base plate one side, first electrode is located the support on the first surface.

In the inkjet printing device provided by the application, the inkjet printing device further comprises a carrying platform positioned on one side of the substrate to be printed, which is far away from the support;

the second electrode is positioned on the carrying platform, the orthographic projection of the first electrode on the second electrode is positioned in the second electrode, and the second electrode and the first electrode form the printing electric field.

In the inkjet printing device that this application provided, the third electrode is treat the pixel electrode of printing the base plate, the third electrode is in orthographic projection on the first electrode is located in the first electrode, the third electrode with the first electrode forms print the electric field.

In the inkjet printing apparatus provided by the present application, an electric field strength of the printing electric field is 0.01 to 20 volts per micron.

In the inkjet printing apparatus provided by the present application, the solute in the ink includes at least one of nanoparticles with surface charges or nanoparticles with surface modified with charged ligands.

In the inkjet printing device that this application provided, inkjet printing device still includes the removal subassembly, it is used for control to remove the subassembly support or microscope carrier with treat the removal in the plane parallel plane at printing base plate place and be used for control the shower nozzle with treat the distance between the printing base plate.

The present application also provides an inkjet printing method, comprising:

printing ink on a substrate to be printed by using the ink-jet printing device;

wherein the step of printing the ink on the substrate to be printed using the inkjet printing apparatus comprises:

the ink forms a solution layer on the substrate to be printed through a spray head;

enabling the solute in the solution layer to be uniformly distributed on the substrate to be printed by utilizing a second electric field;

and removing the solvent in the solution layer to enable the solution layer to form a light-emitting layer.

In the inkjet printing method provided by the present application, the forming a solution layer on the substrate to be printed by the ink through the nozzle includes:

the ink forms a solution layer on the substrate to be printed through the spray head under a first electric field;

wherein the electric field intensity of the first electric field is less than or equal to the electric field intensity of the second electric field;

the second electric field has an electric field strength of 0.01 to 20 volts per micron.

Has the advantages that: this application forms the printing electric field through first electrode and second electrode or first electrode and third electrode, makes the solute in the ink evenly distributed on waiting to print the base plate under the effect of electric field, has avoided the production of coffee ring effect, has improved product quality.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic view of a first structure of an inkjet printing apparatus according to the present application.

Fig. 2 is a schematic view of a second structure of the inkjet printing apparatus of the present application.

Fig. 3 is a schematic view of a third structure of the inkjet printing apparatus of the present application.

Fig. 4 is a schematic view of a fourth structure of the inkjet printing apparatus of the present application.

Fig. 5 is a flowchart of step S1 of the inkjet printing method of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

After the existing ink-jet printing device prints ink on a substrate to be printed, in the process of reducing the solvent of the ink, due to the existence of coffee ring effect, solute in the ink is not uniformly distributed on the substrate to be printed, so that the quality of a product is affected. Based on this, the present application proposes an inkjet printing apparatus and an inkjet printing method.

Referring to fig. 1 to 4, theinkjet printing apparatus 100 includes anozzle 103, aholder 101 for fixing thenozzle 103, and afirst electrode 102 disposed on theholder 101 or thenozzle 103, wherein thenozzle 103 and thefirst electrode 102 are disposed on a side of theholder 101 close to asubstrate 104 to be printed.

Thefirst electrode 102 and thesecond electrode 107 on theinkjet printing apparatus 100 or thethird electrode 105 on thesubstrate 104 to be printed form a printing electric field, and the printing electric field is used for uniformly distributing the solute in the ink on thesubstrate 104 to be printed.

In this embodiment, the printing electric field is a dc electric field.

The printing electric field may be a constant voltage dc electric field, a pulse dc electric field, or other types of dc electric fields, and is not limited herein.

In this embodiment, theinkjet printing apparatus 100 further includes an ink storage component for storing the ink.

When the ink is used to form the light emitting layer of thesubstrate 104 to be printed, the ink storage assembly at least includes a first storage container, a second storage container, and a third storage container for storing red, green, and blue inks, respectively.

In addition, the ink storage assembly further includes a first pipe, a second pipe, and a third pipe, which are respectively connected to the first storage container, the second storage container, and the third storage container and thecorresponding ejection head 103.

According to the printing electric field formed by thefirst electrode 102 and thesecond electrode 107 or thefirst electrode 102 and thethird electrode 105, the solute in the ink is uniformly distributed on thesubstrate 104 to be printed under the action of the electric field, so that the coffee ring effect is avoided, and the product quality is improved.

Referring to fig. 1-4, the electric field strength of the printing electric field is 0.01 to 20 volts per micron.

In the present embodiment, the electric field strength of the printing electric field is preferably 0.1 to 10 volts per micrometer.

When the electric field intensity of the printing electric field is less than 0.01 volt per micrometer, the electric field intensity of the printing electric field is too small, the effect of the electric field force on the solute in the ink is too small, and the solute in the ink is difficult to inhibit from being gathered to the edge along with the reduction of the solvent in the solvent volatilization process, so that the solute is not uniformly distributed on thesubstrate 104 to be printed, and the product quality is influenced; when the electric field intensity of the printing electric field is greater than 20 volts per micron, the electric field intensity of the printing electric field is too large, and the printing electric field may affect the internal structure of theinkjet printing apparatus 100 and the properties of the solute, thereby affecting the product quality; when the electric field intensity of the printing electric field is 0.1 to 10 volts per micrometer, the electric field intensity of the printing electric field is not too small to inhibit the solute in the ink from concentrating to the edge along with the reduction of the solvent in the solvent volatilization process, and is not too large to influence the internal structure of theinkjet printing device 100 and the property of the solute.

In this embodiment, the electric field direction of the printing electric field is determined by the charging property of the solute in the ink.

When the solute is positively charged, the electric field direction of the printing electric field is directed from thefirst electrode 102 to thesecond electrode 107 or thethird electrode 105; when the solute is negatively charged, the electric field direction of the printing electric field is directed from thesecond electrode 107 or thethird electrode 105 to thefirst electrode 102.

In this embodiment, the voltage difference between thefirst electrode 102 and thesecond electrode 107 or thethird electrode 105, or the distance between thenozzle 103 and thesubstrate 104 to be printed, is not limited in particular, and the electric field strength of the printing electric field can be maintained to be 0.01 to 20 volts per micrometer, preferably 0.1 to 10 volts per micrometer.

Referring to fig. 1-4, the solute in the ink at least includes one of nanoparticles with surface charges or nanoparticles with surface modified with ligands with charges.

In this embodiment, the solute may be at least one of nanoparticles with surface charges, such as quantum dots, quantum rods, metal nanoparticles, or other inorganic nanoparticles, or nanoparticles with surface modified with ligands with surface charges.

When the solute is a quantum dot, the quantum dot may be a core-shell type quantum dot, or may be other composite type quantum dots, perovskite type quantum dots, or other types of quantum dots, which is not specifically limited herein.

When the solute material is quantum dots, the ligand material on the surface of the quantum dots can be at least one of organic ligands of common quantum dots such as amine, acid, mercaptan, organic phosphorus and the like.

When the solute material is other composite quantum dots, the solute material can be hydrogel loading type quantum dots or CdSe-SiO₂And (4) quantum dots.

When the ink is used to form the light emitting layer of thesubstrate 104 to be printed, the solute may be a red light material, a green light material, or a blue light material.

For example, when the solute is a core-shell type quantum dot red-like material, the core material of the quantum dot can be CdSe, Cd₂At least one of SeTe, InAs; when the solute is a core-shell type quantum dot green-like material, the core material of the quantum dot can be ZnCdSe₂，InP，Cd₂At least one of SSe.

When the solute material is a core-shell quantum dot, the shell material of the quantum dot may be at least one of CdS, ZnSe, ZnCdS2, ZnS, and ZnO.

When the material of the solute is a metal nanoparticle, the material of the solute may be a gold nanoparticle, a silver nanoparticle, or other metal nanoparticles, and is not particularly limited herein.

When the solute material is other inorganic nano-particles, the solute material can be TiO2, ZnO, SnO₂Or other inorganic nanoparticles, and is not particularly limited herein.

In this embodiment, the ink further includes a solvent for dispersing the solute, and the solvent may be a colorless and transparent low-boiling-point, volatile organic or inorganic solvent, which is not limited herein.

The technical solution of the present application will now be described with reference to specific embodiments.

Example one

Referring to fig. 1 and fig. 2, thethird electrode 105 is a pixel electrode of thesubstrate 104 to be printed, an orthogonal projection of thethird electrode 105 on thefirst electrode 102 is located in thefirst electrode 102, and the third electrode and thefirst electrode 102 form the printing electric field.

In this embodiment, the material of thefirst electrode 102 may be a metal conductive material, and may also be an ITO conductive material or other conductive materials, which is not limited herein.

In this embodiment, thenozzle 103 may protrude from thesupport 101 and extend toward thesubstrate 104 to be printed, and thefirst electrode 102 is located on the surface of thenozzle 103.

In this embodiment, thenozzle 103 may be embedded in thesupport 101, a nozzle of thenozzle 103 does not exceed a first surface of thesupport 101 on a side close to thesubstrate 104 to be printed, and thefirst electrode 102 is located on the first surface of thesupport 101.

When thespray head 103 is embedded in thebracket 101, and the spray opening of thespray head 103 does not exceed the first surface of thebracket 101 close to the side of thesubstrate 104 to be printed, the ink is sprayed from the spray opening of thespray head 103 through the piezoelectric effect.

In this embodiment, the material of theshowerhead 103 is an insulating material, and may be at least one of an inorganic insulating layer material or an organic insulating material.

When the material of theshowerhead 103 is an inorganic insulating material, the material of theshowerhead 103 may be silicon dioxide or glass.

In this embodiment, when thenozzle 103 protrudes from thesupport 101 and extends toward thesubstrate 104 to be printed, and thefirst electrode 102 is located on the surface of thenozzle 103, thefirst electrode 102 may completely cover the surface of thenozzle 103, or may be located on the surface of thenozzle 103 away from the nozzle; alternatively, thefirst electrode 102 may also be located on a first surface of thesupport 101 on a side close to thesubstrate 104 to be printed.

When thefirst electrode 102 is located on the surface of thenozzle 103 away from the nozzle, it is beneficial to avoid that when thenozzle 103 is closer to thesubstrate 104 to be printed, the ink is sprayed from thenozzle 103 and then submerges thefirst electrode 102, or when thenozzle 103 is in direct contact with thesubstrate 104 to be printed, thefirst electrode 102 and thethird electrode 105 located on thesubstrate 104 to be printed are short-circuited, so that theinkjet printing apparatus 100 is damaged, and the uniform distribution of the solute in the ink on thesubstrate 104 to be printed is affected.

When thefirst electrode 102 is disposed on the first surface of thesupport 101, thefirst electrode 102 may be disposed around the entire surface of the nozzle of theshowerhead 103, or may be disposed around the nozzle of theshowerhead 103 in a patterned manner.

Thefirst electrode 102 is disposed on the first surface of thesupport 101 close to thesubstrate 104 to be printed, which is beneficial to preventing thefirst electrode 102 from affecting the internal electronic devices of thenozzle 103 and affecting the ejection of the ink.

In this embodiment, the printing electric field is formed by thefirst electrode 102 and thethird electrode 105, so that the solute in the ink is uniformly distributed on thesubstrate 104 to be printed under the action of the electric field, thereby avoiding the occurrence of the coffee ring effect and improving the product quality.

Example two

Referring to fig. 3 and fig. 4, the present embodiment is the same as or similar to the first embodiment, except that:

theinkjet printing apparatus 100 further comprises astage 106 located on a side of the substrate to be printed 104 away from thesupport 101.

Thesecond electrode 107 is located on thestage 106, an orthogonal projection of thefirst electrode 102 on thesecond electrode 107 is located in thesecond electrode 107, and thesecond electrode 107 and thefirst electrode 102 form the printing electric field.

In this embodiment, the material of thesecond electrode 107 may be a metal conductive material, and may also be an ITO conductive material or other conductive materials, which is not limited herein.

In this embodiment, thesecond electrode 107 is disposed on thestage 106, and thefirst electrode 102 and thesecond electrode 107 form the printing electric field, which is beneficial to avoiding that when thenozzle 103 is too close to or directly contacts thesubstrate 104 to be printed, thefirst electrode 102 and thesecond electrode 107 are short-circuited to cause damage to theinkjet printing apparatus 100 and affect the uniform distribution of the solute in the ink on thesubstrate 104 to be printed; in addition, the printing electric field is formed by thefirst electrode 102 and thesecond electrode 107, and the solute in the ink is uniformly distributed on the substrate to be printed 104 under the action of the printing electric field, so that the coffee ring effect is avoided, and the product quality is improved.

In the above embodiments, theinkjet printing apparatus 100 may further include a moving component, and the moving component is configured to control movement of thesupport 101 or thestage 106 in a plane parallel to a plane of thesubstrate 104 to be printed and to control a distance between thenozzle 103 and thesubstrate 104 to be printed. The movement of thesupport 101 or thestage 106 in a plane parallel to the plane of thesubstrate 104 to be printed is controlled by the moving assembly, which is beneficial to improving the printing efficiency of thesubstrate 104 to be printed during large-scale production and improving the production speed of thesubstrate 104 to be printed; the distance between thespray head 103 and thesubstrate 104 to be printed is controlled by the moving assembly, so that the distance between thespray head 103 and thesubstrate 104 to be printed is conveniently adjusted and controlled in time according to the change of the electric field intensity of the printing electric field, and the electric field intensity of the printing electric field is kept at 0.01 to 20 volts per micron, preferably 0.1 to 10 volts per micron.

In the above embodiments, theinkjet printing apparatus 100 further includes a monitoring component for monitoring the variation of the electric field strength of the printing electric field. When the monitoring component detects that the electric field strength of the printing electric field is less than 0.01 volt per micron or more than 20 volts per micron, the distance between thenozzle 103 and thesubstrate 104 to be printed or the voltage difference between thefirst electrode 102 and thesecond electrode 107 or thethird electrode 105 can be adjusted by the moving component, so that the electric field strength of the printing electric field is maintained at 0.01 to 20 volts per micron, preferably 0.1 to 10 volts per micron.

Referring to fig. 1 to 5, the present application further provides an inkjet printing method, including:

s1, printing the ink on thesubstrate 104 to be printed by theinkjet printing apparatus 100.

Wherein the step of printing the ink on the substrate to be printed 104 by theinkjet printing apparatus 100 comprises:

s11, the ink forms a solution layer on thesubstrate 104 to be printed through thenozzle 103.

In this embodiment, step S11 includes:

s11a, forming a solution layer on thesubstrate 104 to be printed by the ink through thenozzle 103 under the first electric field.

And S12, uniformly distributing the solute in the solution layer on the substrate to be printed 104 by using a second electric field.

And S13, removing the solvent in the solution layer to enable the solution layer to form a light-emitting layer.

In this embodiment, the electric field strength of the first electric field is less than or equal to the electric field strength of the second electric field.

The electric field strength of the first electric field may be 0 volts per micron.

The electric field strength of the second electric field is 0.01 to 20 volts per micron, preferably 0.1 to 10 volts per micron, and the reason for selecting the electric field strength of the second electric field is the same as or similar to the reason for selecting the electric field strength of the printing electric field in the printing device, and is not repeated herein.

In this embodiment, the solute in the ink may be used to form a light emitting layer in a quantum dot photodiode.

When the solute in the ink is used to form a light emitting layer in a quantum dot photodiode, the substrate to be printed 104 further includes a lower transport layer located below the light emitting layer. In order to avoid the influence of the lower transport layer on the first electric field and the second electric field, which influences the uniform deposition of the solute in the ink to form the light-emitting layer, the material of the lower transport layer is preferably a metal oxide, such as ZnO and ZnMgO₂、SnO₂、ZnS、NiO、WO₃And the like.

According to the ink-jet printing method, the printing electric field is formed by thefirst electrode 102 and thesecond electrode 107 or thefirst electrode 102 and thethird electrode 105, so that solutes in ink are uniformly distributed on thesubstrate 104 to be printed under the action of the electric field, the coffee ring effect is avoided, and the product quality is improved.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The foregoing detailed description is directed to an inkjet printing apparatus and an inkjet printing method provided in the embodiments of the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the description of the foregoing embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. An ink-jet printing device is characterized by comprising a spray head, a bracket for fixing the spray head and a first electrode positioned on the bracket or the spray head, wherein the spray head and the first electrode are positioned on one side of the bracket close to a substrate to be printed;

2. Inkjet printing apparatus according to claim 1 wherein the printhead protrudes from the frame and extends toward the substrate to be printed, the first electrode being located on a surface of the printhead.

3. Inkjet printing apparatus according to claim 1 wherein the head is embedded in the frame, the head has an orifice that does not extend beyond a first surface of the frame on a side of the frame adjacent the substrate to be printed, and the first electrode is located on the first surface of the frame.

4. The inkjet printing apparatus of claim 1, further comprising a stage on a side of the substrate to be printed away from the support;

5. The inkjet printing apparatus according to claim 1, wherein the third electrode is a pixel electrode of the substrate to be printed, an orthographic projection of the third electrode on the first electrode is located in the first electrode, and the third electrode and the first electrode form the printing electric field.

6. Inkjet printing apparatus according to claim 1 wherein the printing electric field has an electric field strength of 0.01 to 20 volts per micron.

7. The inkjet printing apparatus of claim 1, wherein the solute in the ink includes at least one of nanoparticles with a surface charge or nanoparticles with a surface modification with a charged ligand.

8. Inkjet printing apparatus according to claim 1,

the inkjet printing device further comprises a moving assembly, wherein the moving assembly is used for controlling the support or the carrying platform to move in a plane parallel to the plane of the substrate to be printed and controlling the distance between the spray head and the substrate to be printed.

9. A method of inkjet printing, comprising:

printing ink on a substrate to be printed using the inkjet printing apparatus of any one of claims 1 to 8;

10. The method of inkjet printing according to claim 9 wherein the step of forming a layer of solution on the substrate to be printed with the ink via a nozzle comprises: