KR101899804B1 - Method for Slimming OLED Panels - Google Patents

Abstract

Disclosed is a method for slimming an OLED panel, which attaches a protective film for suppressing damage to and deformation of a panel due to physical and chemical reactions in slimming an OLED panel. The method can prevent a defective product due to the remaining adhesive by using a reactive UV adhesive to suppress defects of the OLED panel and smoothly remove the protective film, and further improve the production yield of a panel by easy delaminating.

Description

Method for Slimming OLED Panels}

The present disclosure relates to a slimming method for all-red panels. More specifically, the present disclosure relates to a protective film for suppressing damage and deformation of a panel due to physical and chemical action during the slimming process of all-red panel, and suppresses defects of all-red panel using a visible light reactive adhesive And more particularly to a slimming method for an all-red panel which can increase the production yield of a panel by facilitating delaminating.

In recent years, as the importance of display devices has become more important in line with the information society, there is a demand for ultra-light weight for mobile, tablet, monitor, and premium TV.

As such display devices, liquid crystal TFT-LCDs, plasma PDPs, organic light emitting diodes (OLEDs), and organic light emitting diodes (OLEDs) have been developed. In recent years, the thickness of display portions has become thinner to 100 탆 or less.

Among these display devices, organic light emitting diodes (hereinafter, referred to as "OLEDs") are formed by recombining electrons and holes injected through an anode and a cathode into an organic thin film to form an excitation, Emitting display device using a phenomenon in which light is generated.

Conventionally, an adhesive is applied to the circuit pattern forming surface of an all-red panel in order to manufacture an all-red panel (OLED panel) according to the market demand. Then, a protective film is laminated, A slimmed all-red panel is manufactured by delaminating a protective film laminated on an all-red panel after forming a thick all-red panel.

However, in the case of the conventional all-red panel slimming method, when the adhesive used for attaching the protective film to the all-red panel increases the adhesive force under the etching temperature, when the protective film is delaminating from the all red panel, It has not been easily peeled off due to the adhesive force of the adhesive, and the all-red panel of the thin slurry processed (processed) in the delaminating process is deformed or broken to cause not only defective but also reduced production yield.

On the other hand, in order to solve such a problem, it may be considered to introduce an ultraviolet reactive adhesive or an infrared reactive adhesive into the red panel slimming process instead of a conventional adhesive. In addition, a method of introducing the heat shrinkable film into the allred panel slimming process can be considered.

For example, an ultraviolet reactive adhesive or an infrared reactive adhesive is applied to all red panels to laminate the protective film and perform an etching operation. Then, ultraviolet rays or infrared rays are irradiated to the surface of the protective film to form an ultraviolet reactive adhesive or an infrared reactive adhesive By losing the adhesive force, it is expected that the protective film can be easily delaminated from the allred panel. However, in the case of an all-red panel, which is an organic material, since the molecular structure of the organic material is changed due to the infrared ray or ultraviolet ray to be irradiated, the organic material is denatured, which can cause serious defects that cause the color change of the all-red panel. Heat will cause additional processing and damage to the panel.

Therefore, the all-red panel is severely restricted in the slimming process using an ultraviolet reactive adhesive or an infrared reactive adhesive.

Further, in the case of the heat shrinkable film, the temperature of the etchant during the allold panel etching process is about 40 ° C. However, due to the chemical reaction during the slimming process, heat is generated in the panel itself and the temperature is raised to 80 ° C. or more. , And it acts as a factor to increase the defective rate due to the sensitivity of the film.

In addition, when the adhesive strength of a general film is increased, the thinner the thickness of the slimming panel, the more damage is caused in the delamination (peeling) process of the film.

Korean Patent Laid-Open Publication No. 10-2013-0056697 (titled invention: touch panel and its manufacturing method, publication date: May 30, 2013)

The present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a protective film which can prevent defective products issued during the slimming process of all red panels, And to provide a method for improving the production yield of the panel by delaminating it.

According to one embodiment of the present disclosure,

(a) providing an OLED panel having a predetermined thickness;

(b) applying a visible light reactive adhesive to one side of the allold panel;

(c) laminating a protective film on the surface of the all-red panel to which the visible light-reactive adhesive is applied;

(d) etching the laminated allred panel to a desired thickness;

(e) cleaning the etched all red panel;

(f) irradiating the cleaned protective film of the allred panel with visible light for delamination; And

(g) delaminating the protective film from the allred panel;

Lt; / RTI >

Here, the adhesive force of the laminated protective film after performing the step (c) is at least 1 kg / cm 2, the adhesive force of the laminated protective film after the step (f) is less than 5 g /

The visible light-reactive adhesive is provided with an all-red panel slimming method that includes an optical initiator that functions by absorbing short-wavelength light in a wavelength band of 370 nm or less and an optical initiator that functions by absorbing long wavelength light of 410 nm or more.

According to an exemplary embodiment, the visible light reactive adhesive contains an oligomer, a monomer and an additive, wherein the oligomer is a urethane acrylate oligomer, wherein the monomer is selected from the group consisting of isobornyl acrylate and tetrahydrofurfuryl acrylate (tetrahydrofurfuryl acrylate), and the additive may be caprolactone acrylate.

According to an exemplary embodiment, the visible light reactive adhesive comprises 50 parts by weight of a urethane acrylate oligomer, 2 parts by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine, 3 parts by weight of benzyldimethylketal, 17 parts by weight, tetrahydrofurfuryl acrylate 15 parts by weight, and caprolactone acrylate 10 parts by weight.

According to an exemplary embodiment, the visible light reactive adhesive may further comprise 2 to 5 parts by weight of silicon acrylate.

According to an exemplary embodiment, the step of irradiating light of a short wavelength of 370 nm or shorter (concretely, visible light) before the step (c) after the step (b) .

According to an exemplary embodiment, the visible light irradiated in step (f) may be visible light having a long wavelength of 410 nm or more.

According to an exemplary embodiment, the protective film may be a blue polyolefin film.

According to another embodiment of the present disclosure,

(A) providing a protective film;

(B) applying a visible light-reactive adhesive to one side of the protective film;

(C) thermally drying the protective film coated with the visible light-reactive adhesive;

(D) laminating the protective film to an OLED panel having a predetermined thickness so that the plate surface coated with the visible light-reactive adhesive is adhered;

(E) etching the laminated allred panel to a desired thickness;

(F) cleaning the etched all red panel;

(G) irradiating the cleaned protective film of the allred panel with visible light for delamination; And

(H) delaminating the protective film from the allred panel;

Lt; / RTI >

Here, the adhesive strength of the laminated protective film after the step (D) is at least 1 kg / cm 2, the adhesive strength of the laminated protective film after the step (G) is 5 g /

The visible light-reactive adhesive is provided with an all-red panel slimming method that includes an optical initiator that functions by absorbing short-wavelength light in a wavelength band of 370 nm or less and an optical initiator that functions by absorbing long wavelength light of 410 nm or more.

According to an exemplary embodiment, the step of irradiating light having a short wavelength of 370 nm or shorter (specifically, visible light) before the step (E) after the step (D) is performed to temporarily cure the visible light- .

According to an exemplary embodiment, the step (G) may further include cutting the cleaned all-red panel to a desired size.

According to embodiments of the disclosure, the protective film is adhered with a high adhesive force (adhesive strength) during the slimming process of the all red panel, thereby suppressing the damage of the all-red panel and the deformation of the panel caused by the chemical, A plate type all red panel can be implemented. Particularly, the adhesive strength (adhesion strength) of the protective film after the final slimming process is remarkably weakened, so that the protective film can be easily delaminated without further processing. In addition, by using light in the visible light band to weaken the adhesion strength of the protective film, product defects such as the color of the all-red panel can be reduced, and furthermore, However, it offers the advantage of eliminating factors of rising raw material costs.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow diagram of a slimming method for an all-red panel according to one embodiment;
FIG. 2 is a process chart showing the slimming method of the all-red panel according to FIG. 1 step by step; FIG.
3 is a view schematically showing a reaction process of a visible ray-responsive adhesive according to irradiation of a visible ray; And
4 is a flowchart of a slimming method of an all-red panel according to another embodiment.

The present invention can be all accomplished by the following description. The following description should be understood to describe preferred embodiments of the present invention, but the present invention is not necessarily limited thereto. It is to be understood that the accompanying drawings are included to provide a further understanding of the invention and are not to be construed as limiting the present invention. The details of the individual components may be properly understood by reference to the following detailed description of the related description.

1 is a flow chart of a slimming method for an all-red panel according to one embodiment. FIG. 2 is a process chart showing the slimming method of the all-red panel according to FIG. 1 step by step.

Referring to the drawing, first, an all-red panel 10 to be slimming is provided (S10). At this time, the all red panel 10 may have a plate shape having a predetermined thickness.

Next, a visible ray-reactive (curable) adhesive 20 is applied to one side surface of the all-red panel 10 (S20). A circuit pattern or the like may be formed on one side surface of the all-red panel 10 to which the visible light-reactive adhesive 20 is applied.

In this regard, the visible light-reactive adhesive 20 applied to the slimming of the all-red panel can be briefly described as follows.

The visible light reactive adhesive 20 contains (i) a photoinitiator that functions by absorbing short-wavelength light in the wavelength band of 370 nm or less, and (ii) a photoinitiator that functions by absorbing long wavelength light of 410 nm or more. In this connection, a typical example of the photoinitiator that acts by absorbing short-wavelength light in the wavelength band of 370 nm or less is a benzyl dimethyl ketal, and a typical example of the photoinitiator that functions by absorbing long wavelength light of 410 nm or more is 2,4,6-trimethylbenzoyl-diphenylphosphine.

Further, the visible light-reactive adhesive 20 contains an oligomer and a monomer, and may further contain an additive. According to an illustrative embodiment, the oligomer may be a urethane acrylate oligomer, and the monomer may be isobornyl acrylate and tetrahydrofurfuryl acrylate. In addition, the additive may be caprolactone acrylate. The visible light reactive adhesive 20 can be cured by the polymerization reaction described by the two components that function as photoinitiators in different wavelength bands as described above.

According to an exemplary embodiment, the visible light reactive adhesive 20 may further comprise an appropriate amount of silicone acrylate, which may be added to reinforce the releasability of the film. The silicone acrylate is commercially available under the trade name BYK SILCLEAN 3710 (BYK).

Illustratively, the urethane acrylate oligomer of the visible light reactive adhesive 20 in the form of a mixture as described above may be represented by the following formula (1).

[Chemical Formula 1]

CH2CH2COOCH2CH2OCONH1R3-NHCOOCH2CH2COOCH2

According to a particular embodiment, the visible light reactive adhesive 20 comprises 50 parts by weight of a urethane acrylate oligomer, 2 parts by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine, 3 parts by weight of benzyldimethylketal, 17 parts by weight of a tetrahydrofurfuryl acrylate, 15 parts by weight of tetrahydrofurfuryl acrylate, and 10 parts by weight of caprolactone acrylate. Further, the additionally obtainable silicon acrylate may be contained in an amount of about 2 to 5 parts by weight, and more specifically, it may be advantageously contained in 3 parts by weight.

Referring to FIGS. 1 and 2 again, a visible light-reactive adhesive 20 is applied to one side of the all-red panel 10 (S20). Then, the visible light-reactive adhesive 20 may be selectively cured by irradiating visible light having a short wavelength (S25). As described above, the visible light-reactive adhesive 20 is irradiated with visible light of a short wavelength to harden the adhesive agent 20, thereby increasing the adhesive force between the protective film 30 and the all-red panel 10 under the presence of the visible light- .

2 (a), the protective film 30 is laminated on the plate surface of the all-red panel 10 to which the visible ray-reactive adhesive 20 is applied by using the laminating roller 110 laminating (S30). As a result, the all-red panel 10 in which the protective film 30 is laminated as shown in Fig. 2 (b) can be obtained. At this time, the adhesive strength of the laminated protective film may be at least about 1 kg / cm 2, specifically, at least about 1 to 2 kg / cm 2.

2 (c), the laminated panel 10 is immersed in an etching solution or sprayed with an etching solution to etch the opposite surface of the protective film-attached surface of the all-red panel 10 (S40). Through this etching process, the laminated all-red panel 10 can be slimmed to a desired thickness.

When the etching step is completed, a step of cleaning the etched red panel 10 using a cleaner (not shown) or the like may be performed (S50). Illustratively, drying can be performed at the same time the cleaning operation of the etched red panel 10 is completed.

When the cleaning step is completed, a visible ray is irradiated to the protective film 30 laminated on the cleaned all-red panel 10 as shown in FIG. 2 (d) using a visible light generating lamp 120 (S70 ).

Illustratively, the reaction mechanism of the visible light reactive adhesive 20 as irradiated with visible light is shown in FIG.

Referring to the drawings, when the visible ray-reactive adhesive 20 is applied on the transparent panel 10 to laminate the protective film 30, the visible ray-reactive adhesive 20 (FIG. 3 ) Forms a stable molecular array structure.

When visible light is irradiated to the visible light-reactive adhesive 20 stably arranged via the protective film 30, the visible light-reactive adhesive 20 receives visible light energy and a photopolymerization reaction occurs.

Specifically, as shown in Fig. 3 (b), the photoinitiator is converted to the radical state to the irradiated visible light. Illustratively, when the visible light-reactive adhesive 20 contains, for example, a benzyl dimethyl ketal component as a photoinitiator, the curing reaction is caused by the short-wavelength light in the wavelength band of 370 nm or less, the protective film 30 is bonded, The part is in the state of the polymer.

In addition, as shown in FIG. 3 (c), the photoinitiator converted to the radical state reacts with the monomer and the oligomer so that the visible light-reactive adhesive 20 forms a polymer. At this time, the upper portion of the visible light-reactive adhesive layer is completely bonded to the protective film, while the lower portion of the adhesive layer is sticky (having viscosity), and the former step of the polymer is maintained.

Thereafter, the photoinitiator (specifically, 2,4,6-trimethylbenzoyl-diphenylphosphine) component contained in the visible light-reactive adhesive layer, which functions by absorbing the long wavelength light of 410 nm or more in wavelength, (That is, visible light), and as a result, the visible light-reactive adhesive is hardly transformed into a polymer state as shown in Fig. 3 (d).

As such, the visible light-reactive adhesive layer interposed between the all-red panel 10 and the protective film 30 significantly reduces the adhesive force by the irradiation of the visible light. In this case, the adhesive force of the laminated protective film may be 5 g / have.

In the above-described series of processes, the mechanism of the polymerization reaction that occurs as the visible light-reactive adhesive 20 irradiates and absorbs visible light can be expressed as shown in the following reaction formula (1).

[Reaction Scheme 1]

Where P is a photoinitiator, R is an active free radical, and M is a monomer.

According to the above reaction scheme, when the photoinitiator (P) receives light, the active free radical (R) reacts with the oxygen in the air to form a polymer while binding with the monomer (M), and is hardened to a cured state. Specifically, when visible light (specifically visible light having a wavelength of 410 nm or longer, visible light) is irradiated, the visible light-reactive adhesive 20 hardens and hardens by being bonded to the polymer. Therefore, unlike the prior art, a visible ray wavelength band is used without using ultraviolet rays. According to an exemplary embodiment, a blue polyolefin film can be used so as not to react with ordinary sun light or other light, and may contain a photo initiator having a wavelength band of 410 nm or more.

An advantage of embodiments in accordance with the present disclosure is that visible light, rather than infrared and ultraviolet light, is applied to the light source illuminated to the all-red panel 10. That is, since the irradiation of the visible light is used, the molecular structure of the organic material in the all red panel 10 is not changed, and the deformation of the organic material is suppressed. Therefore, the color shift phenomenon, which is one of the major defects in the all- .

2 (e), when the visible light irradiation of the cleaned all-red panel 10 to the protective film 30 is completed, the protective film 30 is transferred to the all-red panel 10, Delaminating and delaminating the same (S80).

According to an exemplary embodiment, the delaminating process may be performed manually by holding the protective film 30 or by separating the red panel 10 from the red panel 10, or by spraying water between the red panel 10 and the protective film 30 So that the protective film 30 can be removed together with the cleaning of the all-red panel 10. In the case of delaminating the protective film 30 manually, it is also possible to remove foreign matter remaining on the mounting surface of the protective film of the all-red panel 10 by cleaning the all-red panel 10.

As another example of the above embodiment, the same procedure as described above is performed, and one side of the all-red panel 10 is coated with the visible light reactive adhesive 20 and the protective film 30 is laminated (S30), the all-red panel 10 is slimmed to a desired thickness through an etching operation (S40). After the all-red panel 10 is cleaned (S50), the cleaned all-red panel 10 is transported by a cutting machine in the state shown in FIG. 2 (f), and the protective film 30 is transferred to the all- The cutting tool 10 may be cut to a size of a predetermined cross sectional area using the cutter 130 as shown in FIG. 2 (g) (S60). At this time, the protective film 30 may function as a protective paper while being subjected to a cleaning process after etching.

2 (h), visible light is irradiated to the protective film 30 laminated on the cut individual aluminum panel 10 by using the visible light generating lamp 120 (S70 ). The adhesive force of the visible ray-responsive adhesive 20 interposed between the individual allred panel 10 and the cut-joined body of the protective film 30 is remarkably reduced by visible light irradiation, 10) (S80) to obtain an all-red panel 10 slimmed to a desired thickness.

4 is a flow chart of a slimming method of an all-red panel according to another embodiment of the present disclosure.

In the slimming method of the all-red panel according to another embodiment of the present disclosure, unlike the previous specific example in which the visible ray-reactive adhesive is applied to the plate surface of the all-red panel and the protective film is laminated, And then adhered to the surface of the all-red panel.

Details of the components including the composition and composition of the visible light-reactive adhesive, and the laminating and delaminating mechanisms thereof are the same as those in the above-described specific examples, unless otherwise stated, so the overlapping description will be omitted.

Referring to FIG. 4, first, a protective film is provided (S10), and the protective film is as described with reference to FIG. Next, the visible ray-reactive adhesive described above is applied to one side surface of the protective film (S20), followed by a thermal drying step (S30). Through this series of procedures, a protective film coated with a visible light reactive adhesive can be produced.

Thereafter, the protective film is laminated so that the surface to which the visible light reactive adhesive of the protective film coated with the visible light reactive adhesive is applied is adhered to one side surface of the OLED panel (S40). Thereafter, as a selective step, the visible ray-reactive adhesive may be cured (S50) into short-wavelength light (or visible light) so as to improve the adhesion between the protective film and the allred panel by the visible light-reactive adhesive.

Then, the protective film coated with the visible light-reactive adhesive, or the allred panel laminated with the protective film subjected to the hardening process is etched to a desired thickness (S60), and then the etched all red panel is cleaned (S70) .

Subsequently, visible light (specifically, light of a wavelength longer than 410 nm) is irradiated to the protective film of the cleaned all-red panel (S80), and the reaction of the visible light-reactive adhesive initiated by the visible light (polymerization reaction or curing reaction (Or visible light-reactive adhesive layer) attached to the protective film. At this time, the cleaned all-red panel may be cut to a desired size prior to selectively irradiating the visible ray. Thereafter, the protective film having a significantly weakened adhesion due to the curing reaction can be easily delaminated from the allred panel (S90).

Through the above-described procedure, it is possible to obtain an all-red panel slimmed to a desired thickness similarly to the above-mentioned specific examples, and the protective film can be smoothly removed without fear of breakage of the all-red panel, It is possible to realize a panel, reduce the defects of the product, and improve the production yield.

10: All Red Panel
20: Visible light reactive adhesive
30: Protective film
110: laminating roller
120: Visible light generating LED lamp
130: cutter

Claims (10)

(a) providing an OLED panel having a predetermined thickness;
(b) applying a visible light reactive adhesive to one side of the allold panel;
(c) laminating a protective film on the surface of the all-red panel to which the visible light-reactive adhesive is applied;
(d) etching the laminated allred panel to a desired thickness;
(e) cleaning the etched all red panel;
(f) irradiating the cleaned protective film of the allred panel with visible light for delamination; And
(g) delaminating the protective film from the allred panel;
Lt; / RTI >
Here, the adhesive force of the laminated protective film after performing the step (c) is at least 1 kg / cm 2, the adhesive force of the laminated protective film after the step (f) is less than 5 g /
Wherein the visible light-reactive adhesive contains an optical initiator that functions by absorbing short-wavelength light in the wavelength band of 370 nm or less, and a photoinitiator that functions by absorbing long-wavelength light of 410 nm or longer. (A) providing a protective film;
(B) applying a visible light-reactive adhesive to one side of the protective film;
(C) thermally drying the protective film coated with the visible light-reactive adhesive;
(D) laminating the protective film to an OLED panel having a predetermined thickness so that the plate surface coated with the visible light-reactive adhesive is adhered;
(E) etching the laminated allred panel to a desired thickness;
(F) cleaning the etched all red panel;
(G) irradiating the cleaned protective film of the allred panel with visible light for delamination; And
(H) delaminating the protective film from the allred panel;
Lt; / RTI >
Here, the adhesive force of the laminated protective film after the step (D) is at least 1 kg / cm 2, the adhesive force of the laminated protective film after the step (G) is 5 g /
Wherein the visible light-reactive adhesive contains an optical initiator that functions by absorbing short-wavelength light in a wavelength band of 370 nm or less and an optical initiator that functions by absorbing long-wavelength light of 410 nm or more. The photoinitiator according to any one of claims 1 to 3, wherein the photoinitiator which acts by absorbing short-wavelength light in the wavelength band of 370 nm or less is benzyldimethylketal, and the photoinitiator which functions by absorbing the long- , 6-trimethylbenzoyl-diphenylphosphine. ≪ / RTI > The visible light reactive adhesive of claim 1 or 2, wherein the visible light reactive adhesive comprises an oligomer, a monomer and an additive, wherein the oligomer is a urethane acrylate oligomer and the monomer is isobornyl acrylate and tetrahydrofur Wherein the additive is a tetrahydrofurfuryl acrylate, and the additive is caprolactone acrylate. The visible light reactive adhesive according to claim 4, wherein the visible light reactive adhesive comprises 50 parts by weight of a urethane acrylate oligomer, 2 parts by weight of 2,4,6-trimethylbenzoyl-diphenylphosphine, 3 parts by weight of benzyl dimethyl ketal, 17 parts by weight of isobornyl acrylate 17 15 parts by weight of tetrahydrofurfuryl acrylate, and 10 parts by weight of caprolactone acrylate. 6. The slimming method of claim 5, wherein the visible light-reactive adhesive further comprises 2 to 5 parts by weight of silicon acrylate. The method of claim 1, further comprising, after the step (b), irradiating visible light having a short wavelength of 370 nm or shorter before the step (c) to cure the visible light- A method of slimming all red panels. [3] The method of claim 2, further comprising the step of irradiating visible light having a short wavelength of 370 nm or shorter before the step (E) after the step (D) to cure the visible light- A method of slimming all red panels. The slimming method according to claim 1 or 2, wherein the visible light is visible light having a long wavelength of 410 nm or more. The method of any preceding claim, further comprising cutting the cleaned all-red panel to a desired size prior to irradiating the visible light.

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