CN110605899A - Laminating method based on curved surface flexible screen and display device - Google Patents

Laminating method based on curved surface flexible screen and display device Download PDF

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Publication number
CN110605899A
CN110605899A CN201910904504.9A CN201910904504A CN110605899A CN 110605899 A CN110605899 A CN 110605899A CN 201910904504 A CN201910904504 A CN 201910904504A CN 110605899 A CN110605899 A CN 110605899A
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CN
China
Prior art keywords
panel
adhesive film
curved
laminating
flexible screen
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910904504.9A
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Chinese (zh)
Inventor
陈波
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Shenzhen Yixin New Materials Co Ltd
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Shenzhen Yixin New Materials Co Ltd
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Publication date
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Priority to CN201910904504.9A priority Critical patent/CN110605899A/en
Publication of CN110605899A publication Critical patent/CN110605899A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0007Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10Methods 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating 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
    • G09F9/301Indicating 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 flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED

Abstract

The invention relates to the technical field of displays and display attaching. The invention relates to a laminating method based on a curved surface flexible screen, wherein the laminating method based on the curved surface flexible screen comprises the steps of arranging a first panel with a curved surface and an optical thermoplastic adhesive film, tearing off a first release film of the adhesive film, attaching the adhesive film to the surface of the first panel, arranging a second panel, tearing off the second release film, attaching one side of the adhesive film, which is far away from the first panel, to the second panel, carrying out hot pressing and defoaming treatment on the first panel and the second panel, and curing the joint of the first panel and the second panel; the display device is manufactured by the film pasting method. The adhesive film can be quickly attached to the first panel and the second panel, bubbles generated in the hot pressing process of the adhesive film are eliminated, the stress at the joint of the first panel and the second panel is absorbed, the adhesive film is prevented from rebounding and the first panel and the second panel are prevented from deforming, the joint yield between the first panel and the second panel is improved, and the display effect and the service life of the display device are improved.

Description

Laminating method based on curved surface flexible screen and display device
Technical Field
The invention relates to the technical field of displays and display attaching, in particular to an attaching method based on a curved surface flexible screen and display equipment.
Background
With the continuous development of science and technology, various types of electronic equipment are gradually applied to life, study and work of people, and curved surface screens and arc surface screens have wider and wider application range due to good operation and visual effects; in order to protect a display in an electronic device, a protective panel is generally attached to a surface of the display by a film.
Because of the lateral part of curved surface screen is crooked, has the R angle, and the pad pasting in-process, the laminating of glued membrane and curved surface screen is not abundant or the laminating dynamics of glued membrane is low, leads to having the bubble between curved surface screen and the glued membrane to the glued membrane depends on the curved surface screen's shape and buckles the back, and easy bounce-back leads to the laminating yield between curved surface screen and the glued membrane to be low, has reduced curved surface display device's performance.
Disclosure of Invention
The invention aims to provide a curved-surface flexible screen-based attaching method and display equipment, so as to overcome the defect of low attaching yield of the conventional flexible curved-surface screen.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, a fitting method based on a curved flexible screen is provided, which comprises the following steps,
s1, arranging a first panel with a curved surface and a thermoplastic optical adhesive film, and tearing off a first release film of the adhesive film;
s2, attaching the adhesive film to the attaching surface of the first panel;
s3, arranging a second panel, and tearing off the second release film on the adhesive film;
s4, attaching one side of the adhesive film, which is far away from the first panel, to the second panel;
s5, performing hot-pressing treatment on the first panel and the second panel;
s6, defoaming the joint of the first panel and the second panel;
and S7, curing the joint of the first panel and the second panel.
In a preferred embodiment, in the step S2, the adhesive film is fixed on the profiling jig, and the first panel is pressed down onto the adhesive film on the surface of the profiling jig.
In a preferred embodiment, in the step S2, the adhesive film is rolled on the curved surface area of the first panel by using a roller.
In a preferred embodiment, in the step S3, the second panel is placed on the profiling fixture, and the first panel to which the adhesive film is attached is pressed down to the surface of the second panel.
In a preferred embodiment, the S2 step and/or the S3 step are performed in a vacuum environment.
In a preferred embodiment, the first panel and the adhesive film are positioned before the step of S2, and the first panel and the second panel are positioned before the step of S3.
In a preferred embodiment, before the step of S2, the adhesive film is cured.
In a preferred embodiment, after the step of S6, a first detecting step is further provided,
if the detection does not reach the standard, tearing off the adhesive film, and executing the steps S2 to S6 again;
if the detection reaches the standard, step S7 is executed.
In a preferred embodiment, a second detection step is provided after the step S7, and if the detection fails to reach the standard, the adhesive film is removed, and the steps S2 to S7 are executed again.
In a preferred embodiment, the method for removing the adhesive film comprises the following steps: the first panel and the second panel are placed in a temperature environment of no more than-60 deg..
In a preferred embodiment, the first panel is a curved cover glass, and the second panel is a flexible display panel.
In a second aspect, a display device is provided, which includes a first panel, a second panel and an adhesive film, wherein the adhesive film is attached to the surfaces of the first panel and the second panel by using the above attaching method based on the curved flexible screen.
The invention has at least the following beneficial effects:
utilize the self-adhesive power of glued membrane, make the glued membrane can attach on first panel and second panel fast, and after hot pressing and bubble removal, make and closely laminate between first panel and the second panel, the bubble that the glued membrane produced in the hot pressing process has been eliminated, improve the arc region laminating quality of first panel and second panel, and the glued membrane has absorbed the stress of first panel with second panel laminating department in the hot pressing process, prevent that the glued membrane from rebounding and first panel and second panel warp, make the laminating of glued membrane more level and smooth, the laminating yield between first panel and the second panel has been improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic flow chart of an embodiment of a fitting method based on a curved flexible screen.
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.
Referring to fig. 1, the laminating method based on the curved flexible screen in this embodiment includes the following steps:
s1, arranging a first panel with a curved surface and an adhesive film, and tearing off a first release film of the adhesive film, wherein the adhesive film is an optically transparent hot melt adhesive film;
s2, attaching the adhesive film to the surface of the first panel;
s3, arranging a second panel, and tearing off the second release film on the adhesive film;
s4, attaching one side of the adhesive film, which is far away from the first panel, to the second panel;
s5, performing hot-pressing treatment on the first panel and the second panel;
s6, defoaming the joint of the first panel and the second panel;
and S7, curing the joint of the first panel and the second panel.
In the embodiment, the optical transparent thermoplastic is adopted for bonding the first panel and the second panel, has good self-adhesive force, light transmittance and elongation, can be quickly and flatly attached to and filled in the plane parts of the first panel and the second panel and the R-shaped angle of the curved surface, and is converted into a completely transparent state after being heated; in the hot pressing process, by applying a pressing force to the first panel and/or the second panel, the adhesive film positioned between the first panel and the second panel is converted into a molten state under the action of hot pressing and flows, so that the plane area and the curved surface area of the first panel and the second panel are attached more tightly, the attachment yield between the first panel and the second panel is ensured, and the adhesive film can absorb partial stress during pressing and attaching to prevent the first panel and the second panel from deforming; in the hot-pressing process of the adhesive film, bubbles are easily generated due to the influence of the external environment, the bubbles between the first panel and the second panel are discharged after defoaming treatment, the phenomenon that the adhesive film is not leveled or converted is improved, and the attaching quality of the first panel and the second panel is further improved; the adhesive film cured in S7 undergoes a cross-linking reaction, so that the first panel and the second panel are relatively fixed.
The glued membrane in this embodiment can attach on first panel and second panel fast, and after hot pressing and bubble removal, make the planar zone of first panel and second panel and R angle curved surface region homoenergetic closely laminate, eliminated the bubble that the glued membrane produced in the hot pressing process, and the glued membrane has absorbed the stress of first panel and second panel laminating department in the hot pressing process, prevent that the glued membrane from rebounding and first panel and second panel warp, make the laminating of glued membrane more level and smooth, the laminating yield between first panel and the second panel has been improved.
Preferably, the Adhesive film can also be a UV-curable optically Clear Adhesive (TOCA) Adhesive film, the light transmittance of the Adhesive film can reach 92%, the display effect after the first panel and the second panel are attached is optimized, the elongation can reach 300%, the Adhesive film has good ductility, the Adhesive film can be prevented from rebounding and the material warping and deforming, the self-Adhesive force is strong, the Adhesive film can be firmly adhered to the first panel and the second panel, and the Adhesive film adhesion stability is improved.
Specifically, in step S2, the profiling jig is used to adsorb the adhesive film, and the jig may be provided with a vacuum chuck or other fixing structure to adsorb and fix the adhesive film and prevent the adhesive film from moving. And tearing off the first release film on the adsorbed adhesive film to expose the adhesive surface of the adhesive film, so as to facilitate the adhesion between the subsequent adhesive film and the first panel.
The first panel is pressed down to the adhesive film on the profiling jig, and the adhesive film is smoothly attached to the plane and the curved surface R-angle area of the first panel; tear the second on the glued membrane afterwards and leave the type membrane, prepare the second panel, place the second panel on the profile modeling tool, push down one side that has attached the glued membrane of first panel to the second panel of profile modeling tool on, realize the laminating of first panel and second panel.
Above-mentioned a profile modeling tool for placing glued membrane and second panel can adopt same profile modeling tool or different profile modeling tools, at the attached in-process of glued membrane, satisfies fixed and the adsorption of glued membrane and second panel to do not interfere the attached of glued membrane, keep away the position to glued membrane is attached.
It is conceivable that, in step S2, the roller is used to attach the arc-shaped bent region of the side portion of the first panel by: the gyro wheel action, the gyro wheel rolls based on first panel arc region, along with the roll of gyro wheel, rolls the both sides of glued membrane in the lateral part of first panel, guarantees the laminating degree between glued membrane and the first panel, prevents to laminate the in-process and appear the bubble and laminate the condition of unevenness. Or the adhesive film is scraped on the plane and curved surface area of the first panel by a scraper which can move along the contour of the arc-shaped bending area of the first panel.
In the step S2, before the adhesive film is attached, the adhesive film and the first panel are positioned so that the adhesive film is accurately attached to the surface of the first panel; in the step S4, before the first panel is attached, the first panel and the second panel are positioned, so that the first panel is accurately attached to the surface of the second panel, and the accuracy of attaching the first panel to the second panel is improved. The above-mentioned locate mode preferably adopts CCD optics positioner to fix a position, guarantees the positioning accuracy to first panel, second panel, glued membrane.
Preferably, the step S2 and the step S4 are performed in a vacuum environment, so that the adhesive film is prevented from being affected by the outside air, bubbles are generated between the first panel and the second panel, and the attaching effect is optimized. If the first panel and the glue film are not aligned in the step S2, the first panel and the glue film can be separated and repositioned, and no production waste is generated; in addition, in the steps S2 and S4, if the corner R of the curved surface of the adhesive film, the first panel and the second panel has bubbles or scratches, rework is not needed, and the adhesive film after hot melting is repaired in the later hot pressing and defoaming steps, so that the defects of bubbles, uneven bonding and the like generated in the adhesive film bonding process are eliminated.
When the step S5 is executed, the process may be performed in a vacuum hot-pressing device, and the first panel and/or the second panel are pressed in the hot-pressing device and kept for a certain time, so as to provide sufficient time for the adhesive film to be transformed into a molten state and to flow, so that the adhesive film is more smoothly filled between the first panel and the second panel, thereby improving the flatness of the first panel and the second panel. The hot pressing temperature is less than 70 degrees, and the glue overflow caused by overhigh hot pressing temperature is prevented on the premise of ensuring that the glue film is converted into a molten state and can flow; keeping a certain hot pressing time under the condition of the hot pressing temperature to provide enough flowing time for the adhesive film and ensure the laminating effect and the laminating efficiency; the hot pressing temperature and the hot pressing time can be reasonably selected according to the size, the specification and other parameters of the first panel and the second panel.
Preferably, the shape and the size of the profiling jig correspond to those of the adhesive film, the first panel and the second panel, so that the adhesive film can be accurately attached to the surfaces of the first panel and the second panel when the adhesive film is subjected to hot pressing, and the adhesive film attaching accuracy is improved.
In step S6, the first panel and the second panel are pressed to extrude bubbles generated by hot pressing of the adhesive film, so that the first panel and the second panel are closely attached to each other, thereby optimizing the attachment effect. The step S6 can be performed in the defoaming device, the process can be performed in a vacuum environment, and the steps S5 and S6 can be directly transferred between the hot-pressing device and the defoaming device, so as to improve the working efficiency.
In step S7, the adhesive film is cross-linked by thermal curing, so as to fix the first panel and the second panel. The temperature of above-mentioned thermosetting is greater than 60, and the glued membrane carries out comprehensive solidification between first panel and second panel under the high temperature effect, improves the laminating intensity and the laminating stability of first panel and second panel. The fixation between the first panel and the second panel can also be realized by means of UV curing.
After the step of S6, a first detection step is further provided, where the first detection step specifically includes: and performing appearance detection and electrical property detection on the defoamed first panel and second panel. 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 detection reaches the standard, continuing to execute the step S7;
if the above detection is not up to standard, the adhesive film is torn off, and steps S2 to S6 are executed.
Because of the transparent hot melt adhesive of optics only has from the power of adhering to, does not have the bonding effect, consequently when tearing the glued membrane, can not destroy first panel and second panel, the simple operation carries out prosthetic prerequisite under to laminating quality, has reduced the rejection rate. When the adhesive film is torn off, the first panel and the second panel can be separated by using an organic solvent, such as alcohol or alcohol gas, so as to remove the adhesive film.
After step S7, a second inspection step is performed on the cured first panel and the second panel, and the second inspection step is performed in the same manner as the first inspection step, and appearance inspection and electrical property inspection are performed.
If the detection reaches the standard, the first panel and the second panel are attached;
if the detection result does not reach the standard, the adhesive film is removed, and the steps S2 to S7 are executed again.
The method for removing the adhesive film comprises the following steps: the first panel and the second panel are placed in a temperature environment not greater than minus 60 degrees, the deformation of the adhesive film is eliminated at the temperature, the adhesive film is restored to the original film pasting state, and the adhesive film can be torn off.
Through the detection and reworking steps, the laminating precision and the laminating effect of the first panel and the second panel are improved, waste products generated in the laminating process are reduced, the laminating cost is reduced, and the practicability of the laminating method is improved.
Preferably, before step S2, the adhesive film is cured by ultraviolet curing, and the adhesive film shrinks and deforms under the influence of the energy of functional groups and molecular structures inside the adhesive film. Because the shrinkage of the adhesive film is generated in the curing process at the position, the adhesive film is not deformed when the curing treatment in the step S7 is executed, the attaching precision and quality of the adhesive film are ensured, and the condition that the bonding surface of the first panel and the second panel is cracked due to the shrinkage of the adhesive film is prevented.
The first panel may be a curved protection panel made of glass or plastic material or a protection panel with a touch component, and the second panel may be a flexible display panel, such as a display or a display device with a touch component.
The invention also provides display equipment which comprises a first panel, a second panel and an adhesive film, wherein the adhesive film is attached to the surfaces of the first panel and the second panel by adopting the attaching method based on the curved flexible screen, so that the display effect and the service life of the display equipment 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 (12)

1. The laminating method based on the curved flexible screen is characterized by comprising the following steps of,
s1, arranging a first panel with a curved surface and a thermoplastic optical adhesive film, and tearing off a first release film of the adhesive film;
s2, attaching the adhesive film to the attaching surface of the first panel;
s3, arranging a second panel, and tearing off the second release film on the adhesive film;
s4, attaching one side of the adhesive film, which is far away from the first panel, to the second panel;
s5, performing hot-pressing treatment on the first panel and the second panel;
s6, defoaming the joint of the first panel and the second panel;
and S7, curing the joint of the first panel and the second panel.
2. The attaching method based on the curved flexible screen of claim 1, wherein in the step S2, the adhesive film is fixed on the profiling fixture, and the first panel is pressed down onto the adhesive film on the surface of the profiling fixture.
3. The laminating method based on the curved flexible screen as claimed in claim 1, wherein in the step S2, the adhesive film is rolled on the curved area of the first panel by a roller.
4. The laminating method based on the curved flexible screen according to claim 2, wherein in the step S3, the second panel is placed on the profiling fixture, and the first panel to which the adhesive film is attached is pressed down to the surface of the second panel.
5. The curved flexible screen-based conforming method according to any one of claims 1 to 4 wherein the step S2 and/or the step S3 are performed in a vacuum environment.
6. The method as claimed in any one of claims 1 to 4, wherein the first panel and the adhesive film are positioned before the step of S2, and the first panel and the second panel are positioned before the step of S3.
7. The curved flexible screen-based laminating method according to any one of claims 1 to 4, wherein the adhesive film is cured before the step of S2.
8. The method for attaching a curved flexible screen according to claim 1, wherein a first detection step is further provided after the step of S6,
if the detection does not reach the standard, tearing off the adhesive film, and executing the steps S2 to S6 again;
if the detection reaches the standard, step S7 is executed.
9. The attaching method based on the curved flexible screen of claim 1, wherein a second detection step is provided after the step of S7, and if the detection does not reach the standard, the adhesive film is removed, and the steps S2 to S7 are executed again.
10. The laminating method based on the curved flexible screen is characterized in that the method for removing the adhesive film is as follows: the first panel and the second panel are placed in a temperature environment of no more than-60 deg..
11. The laminating method based on the curved flexible screen according to claim 1, wherein the first panel is a curved cover glass, and the second panel is a flexible display panel.
12. A display device, comprising a first panel, a second panel and an adhesive film, wherein the adhesive film is attached to the surfaces of the first panel and the second panel by using the method according to any one of claims 1 to 12.
CN201910904504.9A 2019-09-24 2019-09-24 Laminating method based on curved surface flexible screen and display device Pending CN110605899A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111105715A (en) * 2020-01-03 2020-05-05 武汉华星光电半导体显示技术有限公司 Foldable display device and preparation method and jig thereof
CN111425498A (en) * 2020-03-10 2020-07-17 深圳一鑫新材料有限公司 Laminating process of curved surface display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104503629A (en) * 2015-01-19 2015-04-08 欧浦登(顺昌)光学有限公司 Fully-glued curved surface touch control display screen and manufacturing process thereof
CN107264867A (en) * 2017-08-03 2017-10-20 京东方科技集团股份有限公司 Three-dimensional cover plate applying method, optical cement component and conformal instrument

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104503629A (en) * 2015-01-19 2015-04-08 欧浦登(顺昌)光学有限公司 Fully-glued curved surface touch control display screen and manufacturing process thereof
CN107264867A (en) * 2017-08-03 2017-10-20 京东方科技集团股份有限公司 Three-dimensional cover plate applying method, optical cement component and conformal instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111105715A (en) * 2020-01-03 2020-05-05 武汉华星光电半导体显示技术有限公司 Foldable display device and preparation method and jig thereof
CN111425498A (en) * 2020-03-10 2020-07-17 深圳一鑫新材料有限公司 Laminating process of curved surface display device

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