CN110136581B - Thermoplastic optical adhesive attaching method and application and display - Google Patents
Thermoplastic optical adhesive attaching method and application and display Download PDFInfo
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- CN110136581B CN110136581B CN201910257708.8A CN201910257708A CN110136581B CN 110136581 B CN110136581 B CN 110136581B CN 201910257708 A CN201910257708 A CN 201910257708A CN 110136581 B CN110136581 B CN 110136581B
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- display
- bonding
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000003287 optical effect Effects 0.000 title claims abstract description 19
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 18
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 11
- 239000000853 adhesive Substances 0.000 title claims abstract description 10
- 239000002313 adhesive film Substances 0.000 claims abstract description 56
- 238000007731 hot pressing Methods 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 20
- 239000003292 glue Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000006059 cover glass Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 230000000007 visual effect Effects 0.000 claims 1
- 238000010030 laminating Methods 0.000 abstract description 14
- 230000007547 defect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 abstract description 5
- 238000001723 curing Methods 0.000 description 36
- 238000003848 UV Light-Curing Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229920001187 thermosetting polymer Polymers 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000013007 heat curing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Fluid Mechanics (AREA)
- Liquid Crystal (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention relates to a method for laminating thermoplastic optical adhesive, application and a display, wherein the method for laminating comprises the following steps of arranging an adhesive film, and curing the adhesive film for the first time; arranging a first panel and a second panel, and attaching the adhesive film to the binding surface of the first panel and the second panel; carrying out vacuum hot-pressing treatment on the first panel and the second panel; carrying out vacuum defoaming treatment on the first panel and the second panel; and carrying out secondary curing on the first panel and the second panel. The first curing is arranged before the adhesive film is attached to the panel, so that the adhesive film is shrunk and deformed firstly, the bonding quality and precision of the adhesive film are prevented from being influenced by shrinkage in the subsequent curing process, the defects of difficult UV irradiation and poor curing effect caused by shadow regions in the process of bonding firstly and curing secondly are overcome, and the product yield is improved.
Description
Technical Field
The invention relates to the technical field of solidification and display bonding, in particular to a bonding method and application of thermoplastic optical adhesive and a display.
Background
The existing OCA and LOCA glue is easy to generate bubbles and overflow glue when bonding components, and is difficult to rework, so that the film pasting steps are multiple, the pasting efficiency is low, and the production yield is influenced. The thermoplastic optical adhesive film has the characteristics of no adhesiveness, repeated positioning, high transparency, simple process and no size limitation, and is widely applied to bonding between optical and electronic elements.
In the laminating method, in order to fix two adhered interfaces or fix two ultraviolet-opaque objects, the adhesive film needs to be subjected to UV or heating curing, but the adhesive film can shrink in the UV or heating curing process, and the stress and the size defects generated by the shrinkage are difficult to eliminate in the process, so that the appearance defects (such as yellow frames, white edges, yellow spots and the like) and the precision deviation of the product display are caused, the laminating of the two ultraviolet-opaque surfaces cannot be realized, and the processing efficiency, the processing precision and the yield are influenced.
Disclosure of Invention
The invention aims to provide a bonding method and application of thermoplastic optical adhesive and a display, and aims to overcome the defects of poor bonding quality and low precision of the existing bonding method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for attaching thermoplastic optical cement comprises the following steps,
s1, arranging an adhesive film, and curing the adhesive film for the first time;
s2, arranging a first panel and a second panel, and attaching the adhesive film to the joint surface of the first panel and the second panel;
s3, performing vacuum hot pressing on the first panel and the second panel;
s4, performing vacuum defoaming treatment on the first panel and the second panel;
and S5, performing secondary curing on the first panel and the second panel.
In a preferred embodiment, the first curing is ultraviolet irradiation curing, and the second curing is ultraviolet irradiation curing or heat curing.
In a preferred embodiment, step S6 is further provided after step S5, and the first panel and the second panel are cured by heating, and the second curing is ultraviolet irradiation curing.
In a preferred embodiment, the heat curing temperature in step S6 is greater than 60 ℃.
In a preferred embodiment, the temperature in steps S3 and S4 is greater than 40 ℃.
In a preferred embodiment, a detection step is further provided between the step S4 and the step S5,
if the detection result does not reach the standard, removing the adhesive film, and re-executing the steps S2-S4,
if the detection result meets the standard, go to step S5.
In a preferred embodiment, the step of detecting comprises appearance and electrical property detection.
In a preferred embodiment, the steps S3 and S4 are performed in a vacuum environment.
In a preferred embodiment, the first panel is a display, and the second panel is a cover glass or a combination of a cover glass and a touch device.
In a preferred embodiment, the adhesive film is a thermoplastic transparent optical adhesive film.
An application is also provided for a conformable process for a display.
The display is manufactured by the method for laminating the thermoplastic optical adhesive.
The invention has at least the following beneficial effects:
the first curing is arranged before the adhesive film is attached to the panel, so that the adhesive film is shrunk and deformed firstly, the bonding quality and precision of the adhesive film are prevented from being influenced by shrinkage in the subsequent curing process, the defects of difficult UV irradiation and poor curing effect caused by shadow regions in the process of bonding firstly and curing secondly are overcome, and the product yield is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of one embodiment of a method for applying thermoplastic optical cement.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The technical characteristics of the invention can be combined interactively on the premise of not conflicting with each other.
In the existing bonding method, the adhesive film shrinks and deforms in the curing process, the bonding strength of a bonded interface and the bonding dimensional precision are affected by stress generated by shrinkage, the bonding force is reduced, and the material is warped and deformed after bonding, so that the yield is affected.
Based on the above, referring to fig. 1, the embodiment provides a method for attaching a thermoplastic optical adhesive, which includes the following steps:
s1, arranging an adhesive film, and curing the adhesive film for the first time;
s2, arranging a first panel and a second panel, and attaching the adhesive film on the joint surface of the first panel and the second panel;
s3, carrying out vacuum hot-pressing treatment on the first panel and the second panel;
s4, performing vacuum defoaming treatment on the first panel and the second panel;
and S5, performing secondary curing on the first panel and the second panel.
The adhesive film in the embodiment adopts a thermoplastic optical transparent adhesive film, can be converted into a completely transparent state after being heated, has high light transmittance and is convenient to cure; and the adhesive film can absorb partial stress when being pressed and attached, and the deformation incidence of the adhered back panel is reduced. The first curing in step S1 is performed by ultraviolet irradiation, and after the UV irradiation of the adhesive film is completed, the adhesive film shrinks in volume and deforms under the influence of the content of functional groups and the structure of molecules. Because the shrinkage and deformation of the adhesive film are generated in the primary curing process, the adhesive film does not shrink or deform any more when the secondary curing is performed, the laminating precision and the laminating quality of the subsequent adhesive film are ensured, and the condition that the bonding surface is cracked or the bonding panel is cracked due to the shrinkage of the adhesive film is avoided.
According to the first UV curing, the defects of low bonding precision and bonding quality caused by shrinkage of the adhesive film are overcome, and on the other hand, the UV curing is not influenced by the opaque shadow area and the opaque ink area of the bonding panel, so that the adhesive film is completely cured, the problem of bonding force reduction between panels caused by the opaque light is solved, reworking treatment can be performed before the second curing, and the quality and precision of panel bonding are ensured.
The adhesive film subjected to the first UV curing is attached to the attaching surface between the first panel and the second panel, the first panel and the second panel are respectively provided with an attaching area for attaching the adhesive film, the adhesive film can be attached to the first panel or the second panel firstly, then the first panel and the second panel are attached, and the attaching position, the number and the thickness of the adhesive film can be selected according to the actual condition of the attaching method. When the shrunk adhesive film is attached to the first panel and the second panel, the adhesive film can be attached according to the sizes of the attaching areas of the first panel and the second panel, so that the influence of subsequent curing deformation is eliminated, and the adhesive film is attached more accurately.
The first panel is a display or a display device with a touch component, the second panel is protective glass or protective glass with a touch component, and the display device can be an opaque panel such as an LCD display, an LED display, an OLED display or an LCM display module. The size of the glue film corresponds to the specifications of the first panel and the second panel, and is not limited by the size.
And putting the first panel and the second panel which are attached into vacuum hot-pressing equipment for hot-pressing treatment, wherein the hot-pressing treatment is carried out in a vacuum environment. The vacuum hot-pressing equipment comprises a hot-pressing plate for pressing, the first panel and the second panel are placed on the workbench, the hot-pressing plate is pressed downwards to apply pressing force to the first panel and the second panel, a certain pressing time is kept, and an adhesive film between the first panel and the second panel is converted into a molten state and flows under the action of hot pressing, so that the first panel and the second panel are attached more tightly.
The temperature of the hot pressing process is more than 40 ℃ so as to ensure that the adhesive film can be converted into a transparent state and is melted and flowed. The temperature is not too high, so that the chemical reaction inside the adhesive film is avoided, and the adhesive property of the adhesive film is not affected. The hot pressing temperature is influenced by the hot pressing time and the bonding material, and can be reasonably selected according to the specific requirements of the bonding method.
And transferring the first panel and the second panel subjected to hot pressing into a defoaming device for defoaming treatment, wherein the process is also performed in a vacuum environment. The glued membrane is at the hot pressing in-process, because of the easy gassing of external environment influence, through the deaeration processing back, the bubble between first panel and the second panel is discharged for first panel and second panel laminating more closely and level, improved the laminating quality, and can improve the glued membrane and not flow flat or not the phenomenon of conversion, make first panel and second panel after the laminating have good display effect.
And detecting the defoamed first panel and second panel, and putting the first panel and the second panel into a detection device, wherein the detection step comprises appearance detection and electrical property detection. The appearance detection mainly comprises the steps of detecting whether the joint of the first panel and the second panel has a joint which is not jointed by mistake and has obvious cracks, and detecting whether glue overflows by mistake; the electrical property detection is mainly used for detecting whether the contents of the first panel and the second panel can be normally displayed or not after being attached, and whether poor electrical connection positions exist or not. If the phenomenon of failure to reach the standard appears after detection, reworking treatment is carried out; if the substandard phenomenon does not exist, the subsequent steps are continuously executed.
The rework process first needs to separate the first panel from the second panel by using an organic solvent, such as alcohol or alcohol gas, tear off the adhesive film, and perform the first curing of the adhesive film, the bonding with the first panel and the second panel, the vacuum hot pressing and the vacuum defoaming again. Because the thermoplastic optical adhesive film only has self-adhesive force and does not have an adhesive effect, the bonding area of the first panel and the second panel is not damaged when the thermoplastic optical adhesive film is torn off by an organic solvent, and the operation is convenient.
The first panel and the second panel which accord with the detection standard are cured for the second time, the second curing process adopts ultraviolet irradiation curing, the ultraviolet irradiates the joint area of the first panel and the second panel, the adhesive film generates shrinkage deformation on the premise of the first UV curing, the adhesive film does not shrink when the second UV curing is carried out, and the adhesive film generates a crosslinking reaction under the influence of the UV irradiation process and temperature, so that the first panel and the second panel are relatively fixed.
Preferably, the second curing can adopt a thermosetting mode, the thermosetting temperature is higher than 60 ℃, the adhesive film is comprehensively cured between the first panel and the second panel under the action of high temperature, the bonding strength and the bonding stability of the first panel and the second panel are improved through the dual functions of ultraviolet irradiation and heating curing, and the shrinkage rate of curing in the adhesive film bonding process is reduced through the composite curing mode of the first panel and the second panel.
Preferably, set up the curing process for the third time after the UV curing of second time, this curing process for the third time adopts the heating solidification, through the thermosetting of third time for the glued membrane flows between first panel and second panel more thoroughly, and the laminating between first panel and the second panel is more level and more smooth, has improved joint strength.
And (3) performing detection steps on the products which finish all curing processes, wherein the detection steps comprise appearance detection, electrical property detection and mechanical property detection, and finishing all bonding methods for the bonded products which reach the detection standard.
By adopting the process flow of firstly curing and then laminating, the adhesive film is not only contracted and deformed in the primary curing process, but also prevented from influencing the laminating quality of the panel due to the deformation in the subsequent curing process, the laminating firmness of the product is ensured, and the defects of difficult UV irradiation and poor curing effect due to the existence of a shadow area on the panel are overcome.
The invention also provides an application of the bonding method, namely the bonding method is applied to bonding treatment of devices such as a display, a display module and the like. The display is manufactured by the attaching method, so that the display performance, the service performance and the service life of the display are improved.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method for attaching thermoplastic optical cement is characterized by comprising the following steps,
s1, arranging a glue film, and carrying out primary curing on the glue film, wherein the glue film is a thermoplastic transparent optical glue film;
s2, arranging a first panel and a second panel, and attaching the adhesive film to the joint surface of the first panel and the second panel;
s3, performing vacuum hot pressing on the first panel and the second panel;
s4, performing vacuum defoaming treatment on the first panel and the second panel;
and S5, performing secondary curing on the first panel and the second panel.
2. The method of claim 1, wherein the first curing is ultraviolet irradiation curing, and the second curing is ultraviolet irradiation curing or heating curing.
3. The method of claim 1, further comprising a step S6 of heating and curing the first and second panels after the step S5, wherein the second curing is ultraviolet irradiation curing.
4. The method of claim 3, wherein the heating and curing temperature in step S6 is greater than 60 ℃.
5. The method of claim 1, wherein the temperature in steps S3 and S4 is greater than 40 ℃.
6. The method of claim 1, wherein a detecting step is further performed between the step S4 and the step S5,
if the detection result does not reach the standard, removing the adhesive film, and re-executing the steps S2-S4,
if the detection result meets the standard, go to step S5.
7. The method of claim 6, wherein the step of inspecting comprises visual and electrical inspection.
8. The method of claim 1, wherein the steps S3 and S4 are performed in a vacuum environment.
9. The method of claim 1, wherein the first panel is a display, and the second panel is cover glass or a combination of cover glass and a touch device.
10. The method for applying the thermoplastic optical adhesive according to any one of claims 1 to 9, which is used for applying a display.
11. A display manufactured by using the method for attaching a thermoplastic optical adhesive according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910257708.8A CN110136581B (en) | 2019-04-01 | 2019-04-01 | Thermoplastic optical adhesive attaching method and application and display |
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| CN201910257708.8A CN110136581B (en) | 2019-04-01 | 2019-04-01 | Thermoplastic optical adhesive attaching method and application and display |
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| CN110136581A CN110136581A (en) | 2019-08-16 |
| CN110136581B true CN110136581B (en) | 2022-01-04 |
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| CN111415584A (en) * | 2020-03-05 | 2020-07-14 | 深圳全息界科技有限公司 | Display device attaching process and display device |
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| CN101504496A (en) * | 2009-03-04 | 2009-08-12 | 信利半导体有限公司 | Touch screen and panel display module integrated combination module and method for producing the same |
| CN103635854A (en) * | 2011-07-03 | 2014-03-12 | 日本化药株式会社 | Liquid crystal sealant and liquid crystal display cell using same |
| CN202148279U (en) * | 2011-07-22 | 2012-02-22 | 广州市三泰汽车内饰材料有限公司 | Acrylic adhesive tape |
| CN202422091U (en) * | 2012-01-06 | 2012-09-05 | 江西合力泰微电子有限公司 | Surface type touch-control capacitance screen |
| CN102708759A (en) * | 2012-05-18 | 2012-10-03 | 深圳市三鑫精美特玻璃有限公司 | Display screen and processing process thereof |
| CN103077661A (en) * | 2012-12-29 | 2013-05-01 | 深圳市长江力伟股份有限公司 | Display device of mobile terminal and laminating process method thereof |
| CN104388000A (en) * | 2014-11-25 | 2015-03-04 | 深圳晶华显示器材有限公司 | Process and structure for adhering electronic paper and touch screen |
| CN104449542A (en) * | 2014-12-11 | 2015-03-25 | 江南大学 | Preparation method of novel dual-cured UV curing binder |
| CN205295215U (en) * | 2015-12-03 | 2016-06-08 | 昆山裕凌电子科技有限公司 | Self -adhesion conductive silicone piece |
| CN108230900A (en) * | 2016-12-21 | 2018-06-29 | 日东电工株式会社 | Image display device |
| CN207359810U (en) * | 2017-07-23 | 2018-05-15 | 深圳市高仁电子新材料有限公司 | A kind of SCA optical cements coating line |
| CN108417145A (en) * | 2018-02-02 | 2018-08-17 | 深圳全息界科技有限公司 | A kind of full attaching process of display |
| CN108447387A (en) * | 2018-02-02 | 2018-08-24 | 深圳全息界科技有限公司 | A kind of full attaching process of display module with outline border |
| CN108230914A (en) * | 2018-03-12 | 2018-06-29 | 京东方科技集团股份有限公司 | Display device and splicing display device |
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Effective date of registration: 20220309 Address after: 518000 Building 1, COFCO Yunjing Plaza, heshuikou community, Matian street, Guangming District, Shenzhen, Guangdong 2005 Patentee after: Shenzhen Yixin New Materials Co.,Ltd. Address before: 518107 section a, floor 5, building 1, No. 7, Mudun Road, No. 1 Industrial Zone, Loucun community, Xinhu street, Guangming District, Shenzhen, Guangdong Patentee before: Chen Bo |