TW201726848A - Sheet laminating method effectively reducing defects generated by post process failure due to the improvement of the adhesive force - Google Patents

Abstract

This present invention discloses a sheet laminating method for a flat panel display and particularly relates to a method for laminating a solid-state silicon optical-grade adhesive sheet to a flat panel display sheet. The method comprises the steps: before laminating the sheet, carrying out surface treatment of the laminating surface of a silicone layer of the solid-state silicon optical-grade adhesive sheet to improve the adhesive force of the surface of the silicone layer; and after completing surface treatment, immediately laminating the sheet, wherein the adhesion force of the silicone layer after surface treatment is 20-50 N/25mm, thereby significantly improving the adhesion to the sheet for the same silicone layer thickness and effectively reducing defects generated by post process failure due to the improvement of the adhesive force.

Description

Sheet bonding method

The invention belongs to the technical field of flat panel display sheet bonding technology, in particular to a method for bonding a solid silicone optical grade film to a flat display sheet, which can greatly increase the adhesion to the sheet under the same thickness of the silicone layer. Moreover, due to the increased adhesion, the effect of defects caused by failure of the post process can be effectively reduced.

According to the conventional flat panel display, especially the flexible display [the so-called flexible display (Flexible Display) is composed of a flexible display medium (Display Cell), a front panel (Frontplane, FP) and a flexible drive circuit backplane (Backplane, BP). The display has a light and thin bendable, foldable, rollable, curved display], which constitutes the fit of each sheet of the flexible display, and takes a touch panel module (TPM) as an example, such as a window glass inside the panel (Cover) Glass; CG), touch-sensing sheet (Sensor Sheet), and printed circuit board bonding are made of optical adhesive (OCA) as a bonding process. The optically transparent adhesives (optical adhesives) currently used in the industry include solid optical adhesives and liquid optical adhesives.

In the manner of bonding with a liquid optical glue, after applying an optical adhesive (OCA) to a predetermined area of one of the sheets, the other sheet is attached to the sheet coated with the optical adhesive. The optical adhesive is then cured by ultraviolet light to complete the bonding preparation of the two sheets. However, the above-mentioned liquid optical adhesive is used to form a two-piece sheet bonding method. Before the liquid optical glue has not been hardened, the joint edge between the two sheets is easily generated, and must be wiped off immediately. The optical glue will continue to overflow during the wiping process, which is difficult and time consuming to handle. In particular, if the optical glue overflows and cannot be removed immediately, it will be more difficult to remove after it has hardened. In order to improve such a defect, there is a patent of China Patent Publication No. I463574 "Adhesive structure, electronic device having the same structure and its bonding method" (refer to the patent publication on December 1, 2014), and the conforming structure includes A bonding frame is disposed on a peripheral region of the first substrate, and the surface of the bonding frame comprises a plurality of protrusions, and a gap is formed between each of the two adjacent protrusions to accommodate a overflow portion of the liquid adhesive. The patent creates a patterned bonding frame, so that the substrate and the substrate do not have the problem of overflowing during the bonding process, so that the entire process does not need to be scraped and cleaned, and the labor and material cost can be reduced. In addition, the patent No. M485092 "scraping equipment" patent (refer to the patent publication of September 1, 2014) includes a body, a scraper transmission device, a linear displacement device and a platform fixture, wherein the blade transmission device Arranging on the body, and having a horizontal and vertical movement of the scraper assembly, the linear displacement device is disposed on the body, the platform fixture is disposed on the linear displacement device, and can be driven by the linear displacement device One side of the doctor drive is displaced to the other side. The squeegee device of the patent can use a saw-type squeegee to remove the glue layer of the bonding surface quickly, in a large amount and stably. The liquid optical adhesive bonding process generally has problems such as poor light transmittance and low refractive index, and the fluidity must be appropriately adjusted to avoid the problem of overflowing glue, which is lacking.

In addition, the industry also uses an OCA optical tape that is made of a non-substrate, and then attached to a layer of release film on the upper and lower layers to form a comprehensive fit, similar to the OCA optical tape. After mixing and stirring the pre-mixed monomer and the film-forming material, it is hardened by irradiation with UV light, that is, a solid optical adhesive. Solid-state optical grade film OCA must have high transparency, purity, and no foreign matter characteristics, and can not affect the visibility of the final laminated sheet product. The color tone reproducibility does not generate bubbles during the sheet bonding process, and the finished product does not cause yellowness under ambient stress such as high temperature/wet or UV exposure during the process and after shipment. Peeling of each layer (Peeling) Or Debonding) is bad. Solid-state optical grade film OCA is a double-sided tape with high penetration and low haze...etc. In addition to OCA glue, it also includes light and heavy 2-layer release film (RF) as a colloid protection. . The type of solid-state optical grade film OCA is classified into Acrylic Adhesive, Rubber, Silicone Adhesive, and Polyurethane Adhesive. Acrylic Adhesive is better than Silicone Adhesive, but Silicone Adhesive has good thermal stability, low ion content (sodium, potassium, chlorine, amine) and good optical transparency. The anti-yellowing effect is good, and the unique optical properties of Silicone Adhesive are more suitable for the needs of certain products, so there is still a certain demand in the industry. However, due to the poor adhesion of Silicone Adhesive, although the formula can improve the adhesion, the effect is not significant. How to greatly improve the adhesion without changing the material of Silicone Adhesive itself is a difficult problem to be overcome in the industry.

In view of the above-mentioned conventional technology, the inventors of the present invention have accumulated many years of practical expertise in the design and manufacture of precision coated film products. After continuous research and improvement, the invention has been successfully developed and made public.

The main purpose of the present invention is to provide a "sheet bonding method", in particular to a method for bonding a solid silicone optical grade film to a flat display sheet by using a solid silicone prior to laminating the sheet. The surface of the optical grade film is laminated to improve the adhesion of the surface of the silicone layer. Immediately after the surface treatment, the bonding of the silicone layer and the sheet is performed. The adhesion of the layer after surface treatment is 20-50N/25mm, and the thickness of the silicone layer is above 3um, which can be increased by 150-280%, and the adhesion to the sheet can be greatly increased under the same thickness of the silicone layer. Due to the increased adhesion, the effect of defects caused by failure of the post process can be effectively reduced.

The method for bonding the solid silicone optical grade film to the flat display sheet of the invention can also be surface treated on the surface of the solid silicone optical grade film silicone layer and the bonding surface of the sheet before the sheet is bonded, after the surface treatment And immediately fit.

In the foregoing sheet of the present invention, the surface of the bonding surface has a microstructure.

In the foregoing method of the present invention, the surface treatment method includes, but is not limited to, corona, plasma or ozone.

Another main object of the present invention is to provide a "sheet laminating device" which mainly includes a sheet sticking machine and a moving positioning device provided on the side of the sheet sticking machine, and the moving positioning device is provided with a surface treating device.

The aforementioned mobile positioning device of the present invention is a multi-axis robot arm.

The aforementioned surface treatment apparatus of the present invention includes, but is not limited to, a Corona surface treatment apparatus, a Plasma surface treatment apparatus, or an Ozone surface treatment apparatus.

(1)‧‧‧Solid silicone optical grade film

(10) ‧ ‧ 矽 layer

(11)‧‧‧Light release film

(12) ‧‧‧Removable membrane

(2) ‧ ‧ sheets

(20)‧‧‧Microstructure

(3) ‧ ‧ sheets

(4)‧‧‧Paste machine

(40) ‧‧‧ template

(41)‧‧‧Rolling device

(42)‧‧‧ Lifting device

(43) ‧‧‧displacement device

(44) ‧‧‧Upper template

(45) ‧‧‧Rotary device

(5) ‧‧‧Moving displacement devices

(6)‧‧‧ Surface treatment equipment

1 is a cross-sectional view of a solid silicone optical grade film of the present invention; FIG. 2 is a cross-sectional view of a solid silicone optical grade film after surface treatment of the present invention; and FIG. 3 is a cross-sectional view of a laminated sheet of the present invention. Figure 4 is a cross-sectional view of the surface of the present invention after surface treatment; 5 is a cross-sectional view showing the completion of the two-sided bonding of the present invention; FIG. 6 is a schematic view showing the lamination of the microstructured sheet of the present invention; and FIG. 7 is a schematic view showing the lamination of another microstructured sheet of the present invention; Fig. 9 is a plan view of a sheet laminating apparatus of the present invention (1); Fig. 10 is a schematic view (2) of a sheet laminating apparatus of the present invention.

In order to achieve the above-described technical means of the present invention, the present invention will be better understood by the following description of the embodiments of the present invention, and the methods, steps, structures, features, and effects achieved by the present invention. The present invention will be described in the following with reference to the embodiments of the invention. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified manner.

The sheet bonding method of the invention is to laminate a flat display sheet with a solid silicone optical grade film by: surface treating the surface of the solid silicone optical grade film silicone layer before laminating the sheet to improve the surface. The adhesion of the surface of the silicone layer is immediately adhered to the sheet after the surface treatment. The adhesion of the silicone layer after surface treatment is 20-50N/25mm, and the thickness of the silicone layer is above 3um, which can be increased by 150-280%. With the same thickness of the silicone layer, the adhesion to the sheet can be greatly increased, and due to the increased adhesion, the effect of defects caused by failure of the post-process can be effectively reduced.

The solid silicone optical grade film of the present invention is affixed to the flat display sheet The method can also be applied to the surface of the solid silicone optical grade film silicone adhesive layer and the sheet bonding surface before the sheet is bonded (ie, the solid silicone optical grade film silicone layer bonding surface and the sheet bonding surface). The two bonding surfaces are all surface treated. After the surface treatment, the bonding is performed immediately, and a better bonding effect can be obtained.

The specific steps of the laminating method of the present invention are as follows: slicing: the original solid silicone optical grade film is cut into a sheet shape according to a predetermined size, as shown in FIG. 1 , the solid silicone optical grade film (1) includes The silicone layer (10), the light release film (11) and the heavy release film (12) are formed; the light release film (11) is peeled off; the surface treatment is performed on the bonding surface of the silicone layer (10) [surface treatment The surface of the silicone layer can be activated to increase the adhesion or bonding force], as shown in Fig. 2, to improve the adhesion of the surface of the bonding surface of the silicone layer (10); the invention can also be applied to the bonding surface of the sheet. The surface treatment step is to activate the sheet bonding surface; the sheet is bonded, and the silicone layer (10) is bonded to the sheet (2) immediately after the surface treatment of the bonding surface [or the bonding surface of the silicone layer and the sheet bonding) Immediately after the surface treatment, please refer to Figure 3, the bonding of the silicone layer (10) and the sheet (2) can be applied to the sheeting machine; if the invention is to be attached to another sheet (3) In addition, it further comprises the steps of: tearing off the heavy release film (12); surface treatment on the other bonding surface of the silicone layer (10) [may also increase the other bonding surface of the sheet Step of surface treatment], please refer to Figure 4 to improve the adhesion of the surface of the other bonding surface of the silicone layer (10); sheet bonding, after the surface of the other bonding surface of the silicone layer (10) Immediately adhere to the sheet (3) [or another bonding surface of the silicone layer and the surface of the other bonding surface of the sheet immediately after the surface treatment], please refer to As shown in Fig. 5, the bonding of the silicone layer (10) and the sheet (3) can be carried out by a sheet sticking machine; thus, a complete sheet bonding method is constructed by the method of the present invention, because the silicone layer (10) After the surface treatment, the adhesion is 20-50N/25mm, which can be increased by 150-280%. Thus, under the same thickness of the silicone layer (10), the adhesion to the sheet can be greatly increased, and the adhesion is greatly increased. The increase can effectively reduce the effect of defects caused by failure of the post process. The thickness of the silicone layer can also be reduced to achieve the same adhesion as the thickness of the larger silicone layer without the surface treatment process, that is, to reduce the thickness of the silicone layer to achieve the effect of reducing the overall thickness of the product, thus achieving the object of the present invention.

Referring to Figures 6 and 7, the sheet (2) of the present invention has a microstructure (20) on the surface of the bonding surface. For the microstructure (20) such as a light guide sheet or a bio-wafer, please refer to Figures 6-7, and the sheet (2) has a concave-convex microstructure (20) on the surface of the bonding surface. Since the sheet (2) is attached to the mask microstructure (20), when the adhesion is insufficient, bubbles are generated when the post process is heated, and high temperature and high pressure are required to eliminate the bubbles. The method of the invention has large adhesion, and can effectively avoid the generation of bubbles when the process is heated.

The Silicone Adhesive of the present invention is, for example, a well-known anthrone-based pressure-sensitive adhesive containing a diorganopolyoxyalkylene group having an alkenyl group bonded to a ruthenium atom at both ends of a molecular chain, and comprising An R ₃ SiO _1/2 unit (wherein R is an alkyl group, an alkenyl group, or a hydroxyl group) and an organopolyoxyalkylene resin of a SiO _4/2 unit, and a molecule having at least two deuterium atoms bonded to a hydrogen atom; Organic polyoxyalkylene oxide, platinum-based catalyst and organic solvent.

In the foregoing method of the present invention, the surface treatment method includes, but is not limited to, Corona, Plasma or Ozone, and individual Corona, Plasma or Ozone surface treatment. The method is a conventional technique and there is no rumor here.

The following experimental data confirms that the present invention does significantly increase the adhesion. The following table shows that the silicone layer with different thickness (25-100um) is adhered to the glass and 188um PET respectively. It can be seen from the following table that the silicone layer is treated by corona (condition: 40mm/s, distance from the rubber surface 5) -6mm, 3 times back and forth), the adhesion is greatly improved, it can be proved that the invention is applied as a surface treatment before laminating the sheet, which can greatly increase the adhesion of the silicone layer. In addition, if the adhesive force is required to be 18N/25mm, the thickness of the silicone layer can be greatly reduced from 100um to less than 25um, that is, under the same adhesive force, the thickness of the silicone layer can be greatly reduced, which can effectively reduce the overall thickness of the product. Make the product thinner and lighter.

The following table shows the use of a 100um thick silicone layer. After Corona treatment, the water droplet size is measured at different times. It can be seen that the water droplet size is detected immediately after the surface treatment, and the water droplet size is the largest (ie, the contact angle between the silicone surface and the water is the smallest, the most Hydrophilic), the longer the elapsed time, the smaller the droplet size (ie, the larger the contact angle between the surface of the silicone and the water, the worse the hydrophilicity), and the invention can be bonded to the sheet immediately after the surface treatment of the silicone layer is applied. In the method, when the silicone layer has high hydrophilicity, the adhesion of the silicone layer can be greatly improved.

The two important features of the sheet bonding method of the present invention are: surface treatment before bonding the sheet to the silicone adhesive layer of the solid silicone optical grade film, and immediately after the surface treatment, the bonding with the sheet is required. Develop a suitable sheet bonding device for this feature. Since the general sheet material is mostly laminated with a sheet sticking machine, the sheet bonding apparatus of the present invention mainly includes a sheet sticking machine (4) [the sheet sticking machine is a conventional technique], please refer to FIG. It is shown that the tableting machine (4) has a lower template (40) for fixing the sheet [the fixing method is generally vacuum suction, which is not known in the prior art], and the lower template (40) is provided with a rolling device (41) at one end. The rolling device (41) is connected with a lifting device (42) and a displacement device (43), and the lower template (40) is provided with an upper template (44) at the other end, and the upper template (44) is used for fixing the solid silicone optical film (1). [The fixed method is generally vacuum suction], the upper template (44) is coupled with the rotating device (45) and the displacement device (43). Referring to FIG. 9 and FIG. 10 together, the present invention is characterized in that the sheeting machine (4) side is provided with a moving positioning device (5), and the moving positioning device (5) is provided with a surface treatment device (6). The moving positioning device (5) is used for moving and positioning the surface treatment device (6) disposed thereon to the solid silicone optical grade film silicone layer (10) to be surface treated, and then by the surface treatment device (6) The surface treated solid silicone optical grade film silicone layer (10) is surface treated. In the cooperation industry of the present invention, the sheet (2) is fixed to The lower template (40) is at a predetermined position, and the solid silicone optical grade film (1) is fixed to the upper template (44) and the release mold is removed. At this time, the displacement device (5) is actuated to set the surface treatment device thereon ( 6) Align the silicone layer (10), and surface-treat the bonding surface of the silicone layer (10). After the surface treatment is completed, the upper template (44) is rotated downward to a predetermined angular position by the rotating device (45). That is, the solid silicone optical grade film silicone layer (10) and the sheet (2) are aligned with the bonding position], and the rolling device (41) is displaced to the predetermined rolling position by the displacement device (43), and the lifting device (42) is used. The action is lowered to the predetermined position. At this time, by the action of the rolling device (41) and the displacement of the displacement device (43), the rolling is shifted to the position where the fitting is completed, and then the rolling device (41) rises and returns to the position. At the start position, the upper template (44) is rotated back to the starting position, and the finished sheet can be taken out.

In the present invention, since the surface treatment device (6) is disposed on the side of the tableting machine (4), it is very convenient to surface-treat the surface of the silicone resin layer (10), and the surface treatment can be carried out immediately after the surface treatment. In the time point when the silicone layer (10) has high hydrophilicity, the adhesion of the silicone layer which is greatly improved can be maintained, thus achieving another design object of the present invention.

The aforementioned mobile positioning device (5) of the present invention is a multi-axis robot arm.

The aforementioned surface treatment apparatus (6) of the present invention includes, but is not limited to, a Corona surface treatment apparatus, a Plasma surface treatment apparatus or an Ozone surface treatment apparatus, and an individual Corona surface treatment apparatus, A plasma surface treatment device or an ozone surface treatment device is a conventional technique, and there is no mention here.

In summary, the "sheet bonding method" disclosed in the present invention is unprecedented, and has not been seen in publications published at home and abroad, and has a novel patent requirement, and the present invention can eliminate the conventional technology. Missing, and achieving the design purpose, has also fully complied with the patent requirements, and submitted an application according to law. I would like to ask your review committee to give a review and give the patent in this case.

However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art, using the specification of the present invention and the scope of the patent application, or the like. The structural change is intended to be included in the scope of the patent of the present invention.

(1)‧‧‧Solid silicone optical grade film

(10) ‧ ‧ 矽 layer

(2) ‧ ‧ sheets

(3) ‧ ‧ sheets

Claims (11)

A sheet bonding method is a method for bonding a flat-panel display sheet with a solid silicone optical grade film by: surface-treating the surface of the solid silicone optical grade film silicone layer before the bonding of the sheet to improve the silicone rubber The adhesion of the surface of the layer, after the surface treatment, and immediately with the sheet. The sheet bonding method according to claim 1, wherein the surface treatment is performed on the bonding surface of the solid silicone optical grade film silicone layer and the bonding surface of the sheet before the bonding of the sheet, and after surface treatment Immediately fit the person. The sheet bonding method according to claim 1 or 2, wherein the silicone layer of the solid silicone optical grade film has a surface-treated adhesion of 20-50 N/25 mm. The sheet bonding method according to claim 1 or 2, wherein the thickness of the silicone layer of the solid silicone optical grade film is 3 μm or more. The sheet bonding method according to claim 1 or 2, wherein the sheet bonding surface has a microstructure. The sheet bonding method according to claim 1, wherein the step is: slicing: the original solid silicone optical grade film is cut into a sheet shape according to a predetermined size, and the solid silicone optical grade film includes The silicone layer, the light release film and the heavy release film are formed; the light release film is peeled off; the surface treatment is performed on the bonding surface of the silicone layer to improve the adhesion of the surface of the bonding surface of the silicone layer; the sheet bonding, the silicone rubber Immediately after surface treatment of the layer bonding surface, the film is adhered; the heavy release film is peeled off; and the other bonding surface of the silicone layer is surface-treated to improve the adhesion of the surface of the other bonding surface of the silicone layer; The sheet is bonded, and the other surface of the silicone layer is immediately after being treated with the sheet; this constitutes a complete sheet bonding step. The sheet bonding method according to claim 2, wherein the step is: slicing: the original solid silicone optical grade film is cut into a sheet shape according to a predetermined size, and the solid silicone optical grade film includes The silicone layer, the light release film and the heavy release film are formed; the light release film is peeled off; the surface treatment is performed on the bonding surface of the silicone layer to improve the adhesion of the surface of the bonding surface of the silicone layer; Surface treatment; sheet bonding, the bonding surface of the silicone layer and the surface of the bonding surface of the sheet are immediately adhered; the peeling film is peeled off; and the other bonding surface of the silicone layer is surface-treated to improve the silicone layer. The adhesion of the surface of the other bonding surface; the surface treatment is performed on the other bonding surface of the sheet; the bonding of the sheet, the other bonding surface of the silicone layer and the surface of the other bonding surface of the sheet are immediately adhered; Form a complete sheet bonding step. The sheet bonding method according to claim 1 or 2, wherein the surface treatment method is a Corona surface treatment or a plasma surface treatment or an Ozone surface treatment. A sheet laminating device mainly comprises a sheet sticking machine and a moving positioning device arranged on the side of the sheet sticking machine, and the moving positioning device is provided with a surface treating device. The sheet laminating device according to claim 9, wherein the moving positioning device is a multi-axis robot arm. The sheet laminating apparatus according to claim 9, wherein the surface treating apparatus is electric A Corona surface treatment device or a Plasma surface treatment device or an Ozone surface treatment device.