KR20130017529A - Filter for display device and manufacturing method thereof - Google Patents

Filter for display device and manufacturing method thereof Download PDF

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Publication number
KR20130017529A
KR20130017529A KR1020110080018A KR20110080018A KR20130017529A KR 20130017529 A KR20130017529 A KR 20130017529A KR 1020110080018 A KR1020110080018 A KR 1020110080018A KR 20110080018 A KR20110080018 A KR 20110080018A KR 20130017529 A KR20130017529 A KR 20130017529A
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KR
South Korea
Prior art keywords
filter
display device
coating film
transparent substrate
coating
Prior art date
Application number
KR1020110080018A
Other languages
Korean (ko)
Inventor
김종택
오상윤
신동근
허진녕
김호우
Original Assignee
삼성코닝정밀소재 주식회사
Priority date (The priority date 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 date listed.)
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Application filed by 삼성코닝정밀소재 주식회사 filed Critical 삼성코닝정밀소재 주식회사
Priority to KR1020110080018A priority Critical patent/KR20130017529A/en
Publication of KR20130017529A publication Critical patent/KR20130017529A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/201—Filters in the form of arrays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/44—Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/003—Light absorbing elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J2211/44—Optical arrangements or shielding arrangements, e.g. filters or lenses
    • H01J2211/448—Near infrared shielding means

Abstract

The present invention relates to a filter for a display device and a method for manufacturing the same. More particularly, the present invention relates to a filter for a display device and a method for manufacturing the same.
To this end, the present invention is a transparent substrate; A first coating film formed on the transparent substrate and to which a color correction material is added; And a second coating film formed on the first coating film by radiant heat of the transparent substrate and having a near-infrared absorbing material added thereto, and a filter for a display device, and a method of manufacturing the same.

Description

Filter for display device and manufacturing method thereof {FILTER FOR DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a filter for a display device and a method for manufacturing the same. More particularly, the present invention relates to a filter for a display device and a method for manufacturing the same, which can reduce manufacturing costs and at the same time achieve excellent durability through a simplified process.

As the modern society becomes highly informational, display devices are becoming remarkably advanced and rapidly spreading. Display devices such as televisions, PC monitors, portable display devices, and the like have tended to have larger screen sizes and thinner screens.

Accordingly, a cathode ray tube (CRT) device, which is representative of a display device, is a liquid crystal display (LCD), a plasma display panel (PDP) device, and a field emission display device. (FED), organic light emitting display (OLED), and the like, flat panel displays (FPD) are being replaced.

PDP devices are in the spotlight due to their excellent display ability such as brightness, contrast, afterimage, viewing angle, and the like. The PDP apparatus applies a direct current or alternating voltage to the electrodes, whereby discharge occurs in the gas between the electrodes. The image is displayed by excitation of the phosphor by the ultraviolet rays accompanying this and emitting visible light.

However, the PDP device has a problem in that a large amount of electromagnetic waves and near-infrared radiation are emitted. Electromagnetic waves and near-infrared rays have a harmful effect on the human body and may cause malfunctions of precision devices such as cordless phones and remote controls. In addition, due to the orange light (neon light) emitted from the discharge gas, there is a problem that the color purity is poor compared to the CRT apparatus.

Therefore, the PDP device employs a display filter in front of the display panel to solve this problem.

However, the conventional display filter has the following problems.

As shown in FIG. 8, in a structure in which a gap G is present between the display filter 5 and the display panel 10 or other layers on the rear surface, sealing of the gap G is not performed properly. If not, there was a problem that the dust (P) is introduced into the gap (G) from the outside and fixed to the rear of the filter (5).

In addition, conventionally, a hybrid layer prepared by including a near infrared absorbing material in a color correction layer was used as the functional optical layer constituting the display filter 5. However, in this case, there was a problem in that the adhesion of the film after curing was inferior at a temperature of 150 degrees or less at the time of thermal curing at a high temperature on the resin composition. On the other hand, as shown in the graph of Figure 9, when the curing at a high temperature of more than 150 degrees, there is a problem that discoloration of the near-infrared absorbing material that is weak to heat occurs.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to reduce the manufacturing cost through a simplified process and at the same time to achieve a good durability filter for a display device and its manufacturing method To provide.

To this end, the present invention is a transparent substrate; A first coating film formed on the transparent substrate and to which a color correction material is added; And a second coating film formed on the first coating film by radiant heat of the transparent substrate and having a near-infrared absorbing material added thereto.

Here, the transparent substrate is semi-tempered glass, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), acrylic (acryl), polycarbonate (polycabonate, PC), urethane acrylate (polyester), polyester (polyester), epoxy acrylate (epoxy acrylate), brominated acrylate (brominate acrylate) and polyvinyl chloride (PVC) It can be done as one.

The color correction material may include a coloring pigment and a neon cut pigment.

In addition, the second coating layer may have a surface energy of 30 ~ 40 dyne / cm.

In addition, the second coating layer may have a contact angle of 80 degrees or more.

In this case, a silicon compound or a fluorine compound may be added to the second coating layer.

On the other hand, the present invention comprises the steps of applying a first coating material to which the color correction material is added to the transparent substrate; Drying the coated first coating material at high temperature to form a first coating film on the transparent substrate; Applying a second coating material to which the near infrared absorbing material is added to the first coating film; And drying the second coating material by radiant heat emitted in the process of cooling the transparent substrate to form a second coating film on the first coating film.

Here, as the color correction material, a coloring pigment and a neon cut pigment may be used.

And an additive may be added so that the second coating material has a surface energy of 30 ~ 40 dyne / cm.

In addition, an additive may be added such that the second coating material has a contact angle of 80 degrees or more.

In this case, the additive may be a silicone compound or a fluorine compound.

According to the present invention, it is possible to minimize the loss of applying the high temperature drying process using the heater twice, and to prevent discoloration of the near-infrared absorbing material due to high temperature heat, and also to add a material that is weak to heat to the coating film. It is possible to impart various functionalities to the filter for display device manufactured.

1 is a schematic cross-sectional view of a display device having a filter according to an exemplary embodiment of the present invention.
2 is a cross-sectional view showing a filter for a display device according to an embodiment of the present invention.
Figure 3 is a photograph showing a comparison of the measurement results of the contact angle of the material used as a coating film and the material used as a general coating film according to an embodiment of the present invention.
4 to 7 is a process chart showing a filter manufacturing method for a display device according to an embodiment of the present invention in the order of process.
8 is a schematic cross-sectional view of a display device with a filter according to the prior art;
9 is a graph measuring a change in transmittance for each wavelength band of a filter including a high temperature dried near infrared absorbing material according to the related art.

Hereinafter, a display apparatus and a manufacturing method thereof according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

As shown in FIG. 1, the display apparatus filter 100 according to an exemplary embodiment is disposed or mounted in front of the display module 5 constituting the display apparatus, for example, the plasma display apparatus. Here, the filter 100 and the display module 5 are disposed to face each other, whereby a gap G exists between the filter 100 and the display module 5. The gap G may be sealed due to a sealing material (not shown) formed at the edges of the filter 100 and the display module 5 facing each other. In addition, the filter 100 and the display module 5 may be cased by a cover (not shown) provided on the front and rear surfaces.

As shown in FIG. 2, the display device filter 100 includes a transparent substrate 110, a first coating layer 120, and a second coating layer 130.

The transparent substrate 110 is a substrate for forming the first coating film 120. The transparent substrate 110 is semi-tempered glass, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), acrylic (acryl), polycarbonate (polycabonate) , PC), urethane acrylate (Urethane Acrylate), polyester (polyester), epoxy acrylate (epoxy acrylate), brominated acrylate (brominate acrylate) and polyvinyl chloride (polyvinyl chloride, PVC).

The first coating film 130 is formed on the transparent substrate 110. In this case, the first coating layer 130 may be formed on one surface of the transparent substrate 110 facing the display panel 5 or on the opposite side thereof, that is, on the transparent surface of the transparent substrate 110 that is a surface facing the viewer. In addition, the first coating layer 130 may be formed on both surfaces of the transparent substrate 110. The first coating film 130 is made of a polymer resin is formed on the transparent substrate 110 through the coating, which will be described in more detail below.

The first coating layer 130 serves as a functional optical layer constituting the filter 100. That is, the first coating layer 130 may reduce or adjust the amount of red (R), green (G), and blue (B) to increase the color reproduction range of the display device and to improve the top view of the screen. It serves as a color correction layer that changes or corrects the color balance. To this end, a color correction material is added to the first coating layer 130. Here, the color correction material may include a coloring pigment and a neon cut pigment. At this time, the coloring pigments are cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium, nickel dithiol, azo, stryl, phthalocyanine, methine, porphyrin, azaporphyrin System and the like can be used. The neon cut dye is a dye for preventing a phenomenon in which red visible light generated from plasma in the display panel 5 is changed into orange, and absorbs orange light (neon light) to lower the transmittance of light in the wavelength range. . The neon cut dye is not particularly limited because it only absorbs 10% to 90% of light having a wavelength of 550 to 610 wavelengths, but is not particularly limited. Cyanine-based, polymethine-based, squarylium salt-based, phthalocyanine-based, naphthalocyanine-based, and Paddy field, azaporphyrin type, azo type, azochelate type, azurenium type, pyryllium type, croconium type, indoaniline chelate type, indonaphthol chelate type, dithiol metal complex system, pyrromethene type, azomethine type, xanthene type , Oxonol system and the like can be used.

However, in the embodiment of the invention, the pigment added as the color correction material is not limited to the kind exemplified above. Since the type and concentration of the dye are determined by the absorption wavelength, absorption coefficient, and transmission characteristics required for the display, the dye is not limited to a specific kind or numerical value.

In addition, since only the color correction material is added to the first coating layer 130, adhesion with the transparent substrate 110 can be improved than the hybrid layer to which the conventional heterogeneous material is added, and thus the filter for the display device ( 100) durability can be improved.

The second coating film 130 is formed on the first coating film 120. At this time, the second coating film 130 is made of a polymer resin is applied to the first coating film 120 and is formed by drying by the radiant heat of the transparent substrate 110, which will be described in more detail below. In the embodiment of the present invention, the second coating layer 130 serves as a functional optical layer that shields near infrared rays. This is because the plasma display device generates strong near infrared rays over a wide wavelength range, and therefore, it is necessary to use a near infrared shielding layer capable of absorbing near infrared rays over a wide wavelength region. For example, the near-infrared shielding layer functions to shield near-infrared rays in the 850-950 nm wavelength range that causes malfunction of electronic devices such as a wireless telephone or a remote controller. Accordingly, the near infrared rays emitted from the plasma display device are shielded by the near infrared shielding layer, so that even if a remote controller, an optical communication device, or the like is used in the vicinity of the plasma display device, the operation thereof is not disturbed. In order to implement such a role as the near-infrared shielding layer, a near-infrared absorbing material is added to the second coating layer 130. Here, as the near infrared absorbing material, a material for selectively absorbing the wavelength light in the near infrared region is required.

The near-infrared absorbing material that can be used in the present invention is not particularly limited, but a mixed pigment of nickel complex and diammonium, a compound dye containing copper ions and zinc ions, a cyanine dye, an anthraquinone dye, a squarylium compound, One or more types selected from the group consisting of an azomethine compound, an ocisonol compound, an azo compound and a benzylidene compound can be used. In this case, since the second coating layer 130 is formed by drying by radiant heat emitted when the transparent substrate 110 is cooled, the second coating layer 130 is dried at a relatively lower temperature than the first coating layer 120 which is dried at high temperature. Accordingly, relatively heat-sensitive materials among the near-infrared absorbing materials may be freely selected and used because there is no risk of high temperature discoloration.

On the other hand, when the second coating layer 130 is composed of the outermost layer or the top layer to which the surface is exposed, the incoming dust (P) may be stuck to be fixed, and to prevent this, the second coating layer 130 is highly antifouling Need to have Accordingly, the second coating film 130 preferably has a low surface energy of approximately 30 ~ 40 dyne / cm. As shown in FIGS. 3A and 3B, the second coating layer 130 preferably has a contact angle of 80 degrees or more. Here, (a) is a measurement photograph showing a contact angle measurement result when a silicone (silicone) -based compound is added to the polymer resin constituting the second coating film 130, in which case the contact angle was measured at approximately 80 degrees, (b) When the fluorine-based compound was added to the polymer resin constituting the second coating film 130, the measurement photograph showing the contact angle measurement result. In this case, the contact angle was measured to be approximately 95 degrees. That is, in order to increase antifouling properties, the second coating layer 130 may include a silicon compound or a fluorine compound capable of realizing a low surface energy of 30-40 dyne / cm and a contact angle of 80 degrees or more. In this case, as the silicon compound, polysiloxane (polysiloxane), polydimethylsiloxane (polydimethysiloxane) may be used. On the other hand, (c) is a measurement photograph showing the contact angle measurement results for the polymer resin without the additives, in this case, the contact angle was measured to approximately 64 degrees, as shown, as the contact angle is small, dust (P) is easily It can confirm that it is in a state which can stick and stick.

In addition, although not shown, the display apparatus filter 100 according to the embodiment of the present invention may include one or more various functional optical layers, such as an anti-reflection layer, an electromagnetic wave shielding layer, an external light shielding layer, and an antiglare layer, as necessary.

In addition, the PDP device is described as an example for convenience of explanation, but the present invention is not limited thereto, and the display device filter 100 of the present invention may be a large size device such as a PDP device, an OLED device, an LCD device, or an FED device. The present invention may be variously applied to a small mobile display device such as a display device, personal digital assistants (PDA), a small game machine display window, a mobile phone display window, and a flexible display device.

Hereinafter, a method for manufacturing a filter for a display device according to an embodiment of the present invention will be described with reference to FIGS. 4 to 7.

The method for manufacturing a filter for a display device according to an exemplary embodiment of the present invention includes a first coating material applying step, a first coating film forming step, a second coating material applying step, and a second coating film forming step.

First, as shown in FIG. 4, in the first coating material applying step, the first coating material 121 to which the color correction material is added is applied to the transparent substrate 110. Here, the first coating material 121 is made of a high molecular material, and color adjustment dyes and neon cut dyes may be used as the color correction material added to the high polymer material.

Next, as shown in FIG. 5, in the first coating film forming step, the first coating material 121 is dried at a high temperature so that a color correction material is added to the transparent substrate 110. A first coating film 120 is formed. Here, the high temperature drying process for the first coating material 121 may be performed through an electric furnace or a heater 20. The first coating film 120 formed as described above serves as a color correction layer of the filter 100 for a display device manufactured.

Next, as shown in FIG. 6, in the second coating material applying step, the second coating material 131 to which the near infrared absorbing material is added is applied to the first coating film 120 formed on the transparent substrate 110. Here, the second coating material 131 is made of a polymer resin, and the near-infrared absorbing material is a mixed pigment of nickel complex and diammonium, a compound dye containing copper ions and zinc ions, a cyanine dye, and anthra One or more types selected from the group consisting of quinone dyes, squarylium compounds, azomethine compounds, ocisonol compounds, azo compounds and benzylidene compounds can be used.

In addition, in order to increase antifouling property of the second coating layer 130 to be formed, a near-infrared absorbing material is added to the second coating material 131, and the second coating material 131 has a surface energy of 30-40 dyne / cm. And additives to have a contact angle of at least 80 degrees. That is, a silicon compound or a fluorine compound may be used as an additive for implementing such characteristics.

Next, as shown in FIGS. 6 and 7, in the second coating film forming step, the applied second coating material 131 is dried to form the second coating film 130 on the first coating film 120. Here, the drying of the second coating material 131 uses the radiant heat emitted during the cooling of the transparent substrate 110. That is, the heater 20 is used to dry the first coating material 121 in the first coating film forming step. In this case, the transparent substrate 110 is also heated by the high temperature heat applied from the heater 20. Thereafter, when the heater 20 is removed or the transparent substrate 110 is taken out of the heater 20, the transparent substrate 110 is cooled, and radiant heat is emitted from the transparent substrate 110 in this cooling process. Therefore, in the second coating film forming step, the second coating material 131 is dried using such radiant heat. Here, the reason for drying the second coating material 131 using the radiant heat emitted from the transparent substrate 110 is to prevent discoloration of the near infrared absorbing material added to the second coating material 131. In other words, when the second coating material 131 is dried at a temperature equal to the drying temperature of the first coating material 121 to which the color correction material is added, the near-infrared absorbing material that is weaker in heat than the color correction material is added. This is because, as shown in the graph of FIG. 9 of the prior art, discoloration of the near-infrared absorbing material is generated and the transmittance of the filter 100 is considerably lowered. In addition, when the radiant heat emitted from the transparent substrate 110 is used, since a substantial drying process using equipment when forming the first coating layer 120 and the second coating layer 130 may be applied only to forming the first coating layer 120. , The number of processes can be reduced, and the cost of operating the heater 20 can be reduced.

Here, as the second coating material 131 is dried by using radiant heat emitted from the transparent substrate 110, the second coating material applying step and the second coating film forming step are divided for convenience of description, but the second coating material ( The application of 131 and the formation of the second coating layer 130 proceed simultaneously. That is, the first coating is applied to the second coating material 131 is dried by the radiant heat to form a second coating film 130, this process is carried out continuously along the application direction of the second coating material (131).

The second coating layer 130 formed as described above serves as a hybrid layer that simultaneously performs a near infrared shielding and antifouling function.

When the second coating film forming step is performed to form a second coating film 130 on the first coating film 120, the method for manufacturing a filter for a display device according to an embodiment of the present invention is completed, the transparent substrate 110, The filter 100 for a display device including the first coating film 120 and the second coating film 130 is manufactured.

As described above, according to the present invention, the first coating material 121 having the color correction material resistant to heat is added to the transparent substrate 110 and formed into the first coating film 120 through high temperature drying. The second coating material 131 to which the weak near-infrared absorbing material is added is dried using the radiant heat emitted from the transparent substrate 110 to be formed as the second coating film 130 on the first coating film 120. In addition to minimizing the loss of having to apply the high temperature drying process using 20) twice, it is possible not only to prevent discoloration of the near-infrared absorbing material due to high temperature heat, but also to freely use the heat-sensitive material so that the second coating film ( 130) can be provided with a variety of functionalities, the display device filter to increase the antifouling properties by adding an additive having a low surface energy and a large contact angle to the second coating film 130 exposed to the outside And a method for producing the same.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill 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. This is possible.

Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims as well as the appended claims.

100: filter for the display device 110: transparent substrate
120: first coating film 121: first coating material
130: second coating film 131: second coating material
5: display panel 20: heater

Claims (11)

Transparent substrate;
A first coating film formed on the transparent substrate and to which a color correction material is added; And
A second coating film formed on the first coating film by radiant heat of the transparent substrate and having a near infrared absorbing material added thereto;
Filter for a display device comprising a.
The method of claim 1,
The transparent substrate is semi-tempered glass, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), triacetyl cellulose (TAC), polyvinyl alcohol (PVA), acrylic (polyryl), polycarbonate (polycabonate, PC) , Urethane acrylate (polyurethane), polyester (polyester), epoxy acrylate (epoxy acrylate), brominated acrylate (brominate acrylate) and polyvinyl chloride (polyvinyl chloride, PVC) made of any one selected from the group of materials including A filter for display device, characterized in that.
The method of claim 1,
The color correction material filter for a display device, characterized in that it comprises a coloring pigment and a neon cut pigment.
The method of claim 1,
The second coating film is a filter for a display device, characterized in that having a surface energy of 30 ~ 40 dyne / cm.
5. The method of claim 4,
The second coating film is a filter for a display device, characterized in that having a contact angle of 80 degrees or more.
The method of claim 5,
A filter for a display device, characterized in that a silicon compound or a fluorine compound is added to the second coating film.
Applying a first coating material to which a color correction material is added to the transparent substrate;
Drying the coated first coating material at high temperature to form a first coating film on the transparent substrate;
Applying a second coating material to which the near infrared absorbing material is added to the first coating film; And
Forming a second coating layer on the first coating layer by drying the second coating material by radiant heat emitted during the cooling of the transparent substrate;
Filter manufacturing method for a display device comprising a.
The method of claim 7, wherein
The method for manufacturing a filter for a display device, characterized in that a color pigment and a neon cut pigment are used as the color correction material.
The method of claim 7, wherein
Method for producing a filter for a display device characterized in that the additive is added so that the second coating material has a surface energy of 30 ~ 40 dyne / cm.
10. The method of claim 9,
And adding an additive such that the second coating material has a contact angle of 80 degrees or more.
The method of claim 10,
The additive is a method for manufacturing a filter for a display device, characterized in that a silicon compound or a fluorine compound.
KR1020110080018A 2011-08-11 2011-08-11 Filter for display device and manufacturing method thereof KR20130017529A (en)

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KR1020110080018A KR20130017529A (en) 2011-08-11 2011-08-11 Filter for display device and manufacturing method thereof

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Application Number Priority Date Filing Date Title
KR1020110080018A KR20130017529A (en) 2011-08-11 2011-08-11 Filter for display device and manufacturing method thereof

Publications (1)

Publication Number Publication Date
KR20130017529A true KR20130017529A (en) 2013-02-20

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