CN111261803B - Method for improving pit of frit glue - Google Patents
Method for improving pit of frit glue Download PDFInfo
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- CN111261803B CN111261803B CN202010059463.0A CN202010059463A CN111261803B CN 111261803 B CN111261803 B CN 111261803B CN 202010059463 A CN202010059463 A CN 202010059463A CN 111261803 B CN111261803 B CN 111261803B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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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
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Abstract
The invention discloses a method for improving pit of frat glue, which comprises the following steps: adding magnetic rheological body into the frat glue to form the frat glue with the magnetic rheological body; after a magnetic field is applied to the frat glue with the magnetorheologic body, the viscosity of the frat glue is increased after the frat glue is acted by the magnetic field, and the frat glue with the magnetorheologic body is adopted to carry out screen printing operation on the object to be screen printed; the screen printing operation is ended and the magnetic field is removed. The above technical scheme has the advantages that the viscosity and elasticity of the frit glue with the magnetic rheological body are larger than those of the traditional frit glue, the compression of the frit glue with the magnetic rheological body on the frit glue can be recovered to a certain degree, and the shape of the frit glue in a saddle shape can be avoided.
Description
Technical Field
The invention relates to the technical field of OLED (organic light emitting diode) packaging, in particular to a method for improving frat glue recess.
Background
Rigid OLED screen generally adopts laser frat to encapsulate, but because the easy saddle that produces of cover plate glass when screen printing and sintering can have the bubble in gluing with the frat when carrying out the butt fusion with backplate glass for the sealing effect worsens. During screen printing, the fact that the recess of the frat glue after screen printing is reduced and the surface of the frat glue after screen printing is rough is found along with the increase of the standing time of the frat glue on the screen plate. The standing time of the glue material on the screen plate is shortened, the viscosity of the frat glue is reduced, the standing time of the frat glue is increased again, the viscosity is increased, and the depression of the frat glue after screen printing is reduced. Such a change occurs due to a change in viscosity of the frit, and if the change in viscosity is reasonably controlled, the collapse of the frit becomes controllable.
Magnetorheological fluids (MR fluids for short) are suspensions of fine soft magnetic particles of high magnetic permeability and low magnetic hysteresis mixed with a non-magnetic conductive liquid. The suspension has low viscosity and Newtonian fluid characteristics under the condition of zero magnetic field; and under the action of a strong magnetic field, the Bingham body has the characteristics of high viscosity and low fluidity.
Disclosure of Invention
Therefore, a method for improving frat glue recess needs to be provided, and the problem that a better glue shape cannot be obtained due to frat glue recess is solved.
In order to achieve the above object, the inventor provides a method for improving frat glue sag, comprising the following steps:
adding magnetic rheological body into the frat glue to form the frat glue with the magnetic rheological body;
after a magnetic field is applied to the frat glue with the magnetorheologic body, the viscosity of the frat glue is increased after the frat glue is acted by the magnetic field, and the frat glue with the magnetorheologic body is adopted to carry out screen printing operation on the object to be screen printed;
the screen printing operation is ended and the magnetic field is removed.
Further, the screen printing operation is:
coating the frat glue with the magnetic rheological bodies on a screen printing plate, wherein the screen printing plate comprises a gauze and an emulsion, the emulsion is arranged at the bottom of the screen printing plate, the gauze is used for allowing the frat glue with the magnetic rheological bodies to permeate from top to bottom, and the screen printing plate is placed above an object to be screen printed;
And scraping the frat glue with the magnetic rheological bodies on the screen printing plate by using a scraper so that the frat glue with the magnetic rheological bodies penetrates through the screen to be printed on the object to be screened.
Further, when the screen printing operation is finished and the magnetic field is removed, the method also comprises the following steps;
and standing the frit glue with the magnetic rheological body to level the frit glue with the magnetic rheological body.
Further, when the frat glue is subjected to the action of a magnetic field, the strength of the frat glue with magnetorheologic bodies becomes higher after the magnetorheologic bodies in the frat glue with magnetorheologic bodies are linearly arranged.
Further, after the screen printing operation is finished and the magnetic field is removed, the method also comprises the following steps:
and (3) placing the object to be screen-printed in a magnetic field generated by alternating current with gradually reduced intensity, wherein the magnetic field generated by the alternating current is used for removing the magnetism of the frat glue.
Further, the direction of applying the magnetic field to the frit paste with the magnetic rheological body is a single direction and is perpendicular to the plane of the object to be screened.
Further, the object to be screen-printed is cover glass.
Different from the prior art, the frat glue with the magnetic rheological body in the technical scheme has higher viscosity and elasticity than the traditional frat glue, the extrusion of the frat glue with the magnetic rheological body on the frat glue can be recovered to a certain degree, and the frat glue can be prevented from being saddle-shaped.
Drawings
Fig. 1 is a schematic structural diagram of a frit glue with a magnetorheological body in a magnetic field according to this embodiment;
FIG. 2 is a schematic structural diagram of the frit glue with the magnetic rheological body in the non-magnetic field according to the embodiment;
FIG. 3 is a flowchart illustrating the steps of the screen printing operation of the present embodiment;
fig. 4 is a structural schematic diagram of the frit glue with the magnetic rheological body in a non-magnetic field according to the embodiment.
Description of the reference numerals:
1. printing the object with a screen;
2. frat glue with magnetic rheological body;
21. a magnetic rheological body;
3. screen printing;
31. screening;
32. an emulsion;
4. and (4) scraping the blade.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 4, the present embodiment provides a method for improving frat glue dishing, including the following steps: the magnetorheological fluid is a suspension formed by mixing tiny soft magnetic particles with high magnetic conductivity and low magnetic hysteresis and non-magnetic conductive liquid. The magnetorheological fluid has the characteristics of low viscosity Newtonian fluid under the condition of zero magnetic field; under the action of strong magnetic field, the Bingham fluid (Bingham fluid) with high viscosity and low fluidity is presented. The magnetic rheological body 21 (nano magnetic particles) is added into the frat glue to form the frat glue 2 with the magnetic rheological body, and the frat glue 2 with the magnetic rheological body has the property of the magnetorheological fluid. The frat glue 2 with the magneto-rheological fluid can also have the characteristics of the magneto-rheological fluid under the condition of not influencing the performance of the frat glue per se. Namely, the frat glue 2 with the magnetic rheological body shows the Newtonian fluid characteristic of low viscosity under the condition of zero magnetic field, and shows the Bingham fluid characteristic of high viscosity and low fluidity under the action of strong magnetic field. The viscosity and elasticity of the frit glue 2 with the magnetic rheological body are larger than those of the traditional frit glue, the compression of the frit glue 2 with the magnetic rheological body on the frit glue 2 can be recovered to a certain degree, and the saddle-shaped shape can be avoided.
After the frit 2 with the magnetic rheological body is prepared, the frit 2 with the magnetic rheological body is coated on the gauze 31 of the screen printing plate 3, and the object to be screen printed 1 can be cover glass in the OLED field and the like. When a strong magnetic field is applied to the frit rubber 2 having the magnetic rheological body, the viscosity of the frit rubber 2 having the magnetic rheological body increases. Various magnetic fields can be applied to the working environment using magnetic field generators, which can be solenoids or coil-made magnetic field generators, which can be dc and ac magnetic fields. In the magnetic field, when the magnetorheological bodies 21 in the frat glue 2 with the magnetorheological bodies are linearly arranged (or arranged in a fiber shape), the viscosity of the frat glue 2 with the magnetorheological bodies is higher in the strong magnetic field, the surface tension of the frat glue with the magnetorheological bodies is increased, the wetting between the frat glue with the magnetorheological bodies and the screen printing plate is poor, at this time, the screen printing operation on the object to be screen printed is better, namely, the frat glue 2 with the magnetorheological bodies is not easily brought up by the emulsion on two sides of the cross section of the frat glue during the plate separation, and the condition that the frat glue 2 with the magnetorheological bodies is low in the middle and high on two sides (saddle shape) can be prevented. It is of course also possible to screen-print the object 1 to be screened when the magnetorheologic bodies 21 in the frit 2 with the magnetorheologic bodies are not in a linear (or fibrous) arrangement.
Referring to fig. 3, in the present embodiment, the screen printing operation may be performed by first applying a magnetic field to the frit 2 with the magnetorheological fluid in a single direction perpendicular to the plane of the object to be screened. For example, the frit 2 with the magnetorheological bodies and the whole process environment are placed in a strong magnetic field which is vertical to the object to be screened downwards. The direction of the arrows in fig. 2 is the direction of the magnetic field, and the magnetic field generated for the direct current, i.e. the direction of the magnetic field, remains unchanged. The strong magnetic field can make the frit glue 2 with the magnetic rheological body have larger viscosity. Preferably, when the magnetic rheological bodies 21 in the grit glue 2 with the magnetic rheological bodies are in a linear arrangement state, the grit glue 2 with the magnetic rheological bodies is placed on the gauze 31 of the screen 3, and the gauze 31 can be penetrated by the grit glue 2 with the magnetic rheological bodies from top to bottom. The bottom of two sides of the screen printing plate or other outer wall parts are provided with an emulsion 32, the screen printing plate 3 is placed above the object to be screen printed 1, a distance is formed between the screen printing plate and the object to be screen printed 1, the distance can be adjusted to be 0.5-2.5 mm according to equipment process parameters, and no fixed value is provided. Then, the doctor blade 4 is used to scrape the frit 2 with the magnetic rheological body on the screen 31, so that the frit 2 with the magnetic rheological body enters the object to be screened under the screen 32 from the screen 31, and then the frit 2 with the magnetic rheological body is screened on the object to be screened 1 through the screen.
The screen printing operation includes a set-off operation which is required after the printing of the flit offset with the magnetorheology on the object 1 to be screen printed. The plate separation operation is to separate the screen plate from the screen to be printed, and after the separation, the magnetic field is removed, so that the viscosity of the frit glue with the magnetorheological body in a zero magnetic field can be reduced. And (3) standing the object to be screen-printed for a period of time to restore the frat glue with the magnetorheological body to the original state of low viscosity, namely, the viscosity of the frat glue with the magnetorheological body is the same as or similar to that of the frat glue with the magnetorheological body before the magnetic field is applied. Due to the surface tension and gravity of the frit with magnetorheology, the frit with magnetorheology initially takes an irregular shape like a saddle, and after standing for a period of time, becomes a glue-type shape with a smooth arc-shaped surface.
The middle part of the cross section of the frit rubber of the magnetorheological fluid is relatively small in contribution to emulsion support compared with the two sides, a scraper can generate serious depression on the extrusion of a saddle-shaped part under normal conditions, the existing frit rubber is small in viscosity and elasticity, and deformation formed is difficult to restore by self. The frat glue with the magnetic rheological body has high viscosity and elasticity, and can restore the deformation generated by extrusion to a certain degree by virtue of the restoring force of the frat glue after the frat glue is kept still for a period of time, so that the saddle-shaped form of the frat can be improved.
After the screen printing is finished, the magnetorheological body remains magnetic. To eliminate the magnetism, the object to be screen-printed may be subjected to a magnetic field generated by an alternating current of gradually decreasing intensity. The direction of the magnetic field of the alternating current generating magnetic field may exhibit a periodic variation. The direction of the magnetic field as in the above screen printing is perpendicular to the object to be screen printed downwards, so that the direction of the alternating magnetic field at this time can be perpendicular to the object to be screen printed upwards and perpendicular to the object to be screen printed downwards respectively and exhibit a periodic direction change. Of course, the direction of the alternating magnetic field may also be horizontally left and horizontally right, respectively, along the direction of the centre line of the object to be screen printed. And the magnetic field generated by the alternating current with gradually weakened strength is matched with the change of the direction of the periodic magnetic field to remove the magnetism of the frat glue in the object to be screen-printed, and the magnetic field generated by the alternating current is closed after the magnetism of the object to be screen-printed is removed.
It should be noted that, this embodiment can modify the original machine to obtain this function, for example, add the components that generate the magnetic field such as the magnetic field generator, etc., need not to purchase additional equipment, also control the cost of production, improve the efficiency of production.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (7)
1. A method for improving frat glue recess is characterized by comprising the following steps:
adding magnetic rheological bodies into the frat glue to form the frat glue with the magnetic rheological bodies;
after a magnetic field is applied to the frat glue with the magnetorheologic body, the viscosity of the frat glue is increased after the frat glue is acted by the magnetic field, and the frat glue with the magnetorheologic body is adopted to carry out screen printing operation on the object to be screen printed;
the screen printing operation is ended and the magnetic field is removed.
2. A method of improving frat glue sag according to claim 1, wherein the screen printing operation is:
coating the frat glue with the magnetic rheological bodies on a screen printing plate, wherein the screen printing plate comprises a gauze and an emulsion, the emulsion is arranged at the bottom of the screen printing plate, the gauze is used for allowing the frat glue with the magnetic rheological bodies to permeate from top to bottom, and the screen printing plate is placed above an object to be screen printed;
and scraping the frat glue with the magnetic rheological bodies on the screen printing plate by using a scraper so that the frat glue with the magnetic rheological bodies penetrates through the screen to be printed on the object to be screened.
3. A method of improving frat glue sag according to claim 1, further comprising the steps of, at the end of the screen printing operation and with the magnetic field removed;
and standing the frit glue with the magnetic rheological body to level the frit glue with the magnetic rheological body.
4. The method as claimed in claim 1, wherein the degree of tack rubber with magnetorheologic bodies becomes greater when the magnetorheologic bodies are linearly arranged in the tack rubber with magnetorheologic bodies after the tack rubber is subjected to the magnetic field.
5. A method of improving frat paste recession as defined in claim 1, further comprising the steps of, after the screen printing operation is completed and the magnetic field is removed:
and (3) placing the object to be screen-printed in a magnetic field generated by alternating current with gradually reduced intensity, wherein the magnetic field generated by the alternating current is used for removing the magnetism of the frat glue.
6. A method for improving frat glue sag according to any one of claims 1 to 5, wherein the direction of the applied magnetic field to the frat glue with magnetorheologic bodies is unidirectional and perpendicular to the plane of the object to be screened.
7. The method for improving frat glue sag of any one of claims 1 to 5, wherein the object to be screen printed is a cover glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010059463.0A CN111261803B (en) | 2020-01-19 | 2020-01-19 | Method for improving pit of frit glue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010059463.0A CN111261803B (en) | 2020-01-19 | 2020-01-19 | Method for improving pit of frit glue |
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| CN111261803A CN111261803A (en) | 2020-06-09 |
| CN111261803B true CN111261803B (en) | 2022-05-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114464094A (en) * | 2022-02-23 | 2022-05-10 | 深圳市华星光电半导体显示技术有限公司 | Flexible display device and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2765813B1 (en) * | 1997-07-11 | 1999-08-20 | Novatec | SQUEEGEE FOR APPLYING PRODUCTS PRESENTING A HIGH DEGREE OF VISCOSITY AND THIXOTROPY CHARACTERISTICS ON A SUBSTRATE CAPABLE OF PRESENTING VARIATIONS IN HEIGHT, THROUGH A STENCIL, APPLIED TO SAID SUBSTRATE |
| US6221138B1 (en) * | 1999-06-30 | 2001-04-24 | Ncr Corporation | Jet ink with a magneto-rheological fluid |
| ITMI20010807A1 (en) * | 2000-04-14 | 2002-10-13 | Saint Gobain | PROCEDURE FOR THE MANUFACTURE OF ELECTRO-CONDUCTOR TRACKS SUNUN TRANSPARENT SUBSTRATE AND SUBSTRATE OBTAINED |
| JP4682691B2 (en) * | 2005-05-13 | 2011-05-11 | 凸版印刷株式会社 | Method for manufacturing organic electroluminescence device |
| US8286705B2 (en) * | 2009-11-30 | 2012-10-16 | Schlumberger Technology Corporation | Apparatus and method for treating a subterranean formation using diversion |
| CN207607214U (en) * | 2017-06-23 | 2018-07-13 | 上海和辉光电有限公司 | Scraper mechanism is used in frit screen printing processings |
| CN209683134U (en) * | 2019-02-14 | 2019-11-26 | 京东方科技集团股份有限公司 | Scraper device and screen printing equipment |
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