KR20120092308A - Optical filter for display appratus - Google Patents

Optical filter for display appratus Download PDF

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Publication number
KR20120092308A
KR20120092308A KR1020110012274A KR20110012274A KR20120092308A KR 20120092308 A KR20120092308 A KR 20120092308A KR 1020110012274 A KR1020110012274 A KR 1020110012274A KR 20110012274 A KR20110012274 A KR 20110012274A KR 20120092308 A KR20120092308 A KR 20120092308A
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KR
South Korea
Prior art keywords
layer
metal oxide
refractive index
low refractive
optical filter
Prior art date
Application number
KR1020110012274A
Other languages
Korean (ko)
Inventor
안진수
이재홍
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 KR1020110012274A priority Critical patent/KR20120092308A/en
Publication of KR20120092308A publication Critical patent/KR20120092308A/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
    • G02B5/28—Interference filters
    • G02B5/285—Interference filters comprising deposited thin solid films
    • 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
    • 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
    • H01J11/46—Connecting or feeding means, e.g. leading-in conductors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/008—Surface plasmon devices
    • 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
    • H01J2211/446—Electromagnetic shielding means; Antistatic means

Abstract

The present invention relates to an optical filter for a display device, and more particularly, to an optical filter for a display device having an excellent electromagnetic shielding function as well as excellent durability and environmental resistance.
To this end, the present invention is a transparent substrate; An electromagnetic shielding layer formed on the transparent substrate; And a low refractive index layer formed on the electromagnetic shielding layer and made of a low refractive material, wherein the low refractive index layer has a refractive index of 1.4 to 1.8 and a contact angle of 150 Hz or more. do.

Description

Optical filter for display device {OPTICAL FILTER FOR DISPLAY APPRATUS}

The present invention relates to an optical filter for a display device, and more particularly, to an optical filter for a display device having an excellent electromagnetic shielding function as well as excellent durability and environmental resistance.

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, Cathode Ray Tube (CRT) devices, which are representative of display devices, include Liquid Crystal Display (LCD), Plasma Display Panel (PDP) devices, and Field Emission Display devices. : FED) and flat panel displays (FPDs) such as organic light emitting displays (OLEDs).

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.

On the other hand, in recent years, as such display filters are used for DID (Digital Information Display) as product diversification, environmental resistance such as anti-reflection function, durability due to outdoor exposure, and antifouling function are required. Therefore, when the display filter is to be applied to the DID, it is urgent to develop a display filter having the above function.

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 provide an optical filter for a display device having a low reflectance and excellent durability and environmental resistance to incident light.

To this end, the present invention is a transparent substrate; An electromagnetic shielding layer formed on the transparent substrate; And a low refractive index layer formed on the electromagnetic shielding layer and made of a low refractive material, wherein the low refractive index layer has a refractive index of 1.4 to 1.8 and a contact angle of 150 Hz or more. do.

Here, the electromagnetic shielding layer is formed by repeatedly stacking one or more times in the order of the first high refractive metal oxide layer, the first conductive metal oxide layer, the metal layer, the second conductive metal oxide layer and the second high refractive metal oxide layer. The second conductive metal oxide layer may be stacked on the outermost layer of the shielding layer.

In this case, the first and second high refractive metal oxide layers may have a refractive index of 2.0 ~ 2.3.

In addition, the low refractive index material may be any one selected from the group of low refractive index materials consisting of diamond like carbon (DLC), MgF 2 and SiO 2 .

In addition, the DLC may be doped with CF 4 or CF 6 .

In addition, the DLC may be CF 4 or CF 6 doped at a concentration of 0.5wt% ~ 10wt% compared to the DLC.

In addition, the first and second high refractive metal oxide layers may include Nb 2 O 5 , and the first and second conductive metal oxide layers may include AZO.

According to the present invention, by forming a low refractive index layer on the electromagnetic shielding layer, there is an effect of lowering the reflectance for incident light and improving the transmittance.

In addition, according to the present invention, by forming a low refractive index layer with low refractive materials of DLC, MgF 4 and SiO 2 , there is an effect of improving the durability and environmental resistance.

In addition, according to the present invention, by omitting a separate film having an anti-reflection function, it is possible to simplify the structure of the filter, thereby improving the productivity and reduce the manufacturing cost.

1 is a cross-sectional view schematically showing an optical filter for a display device according to an embodiment of the present invention.
Figure 2 is a cross-sectional view schematically showing the structure of the electromagnetic shielding layer according to an embodiment of the present invention.
3 to 5 are graphs comparing optical characteristics of an optical filter for a display device according to an exemplary embodiment of the present invention. FIG. 3 is a low refractive index layer formed before forming a low refractive index layer. Is a graph showing optical characteristics when MgF 2 was formed as a low refractive index layer.
Figure 6 is a photograph showing the water repellent characteristics of the optical filter for a display device according to an embodiment of the present invention.

Hereinafter, an optical filter for a display device 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.

1 and 2, an optical filter 100 for a display device according to an exemplary embodiment of the present invention includes a transparent substrate 110, an electromagnetic wave shielding layer 120, and a low refractive index layer 130.

The transparent substrate 110 preferably has high transparency and heat resistance. In terms of transparency of the transparent substrate 110, the visible light transmittance is preferably 80% or more, and in terms of heat resistance, the glass transition temperature is preferably 50 ° C or more. In addition, an inorganic compound molding and an organic polymer molding may be used as the material of the transparent substrate 110. At this time, examples of the inorganic compound molded article include semi-tempered glass and quartz. The organic compound moldings include polyethylene terephthalate (PET), acrylic, polycarbonate (PC), urethane acrylate (polyurethane acrylate), polyester (polyester) and epoxy acrylate (epoxy acrylate). , Brominated acrylate (polyester), polyvinyl chloride (PolyVinyl Chloride, PVC) and the like.

The electromagnetic shielding layer 120 is a layer that shields electromagnetic waves emitted from the display panel to the outside. The electromagnetic shielding layer 120 is formed on the transparent substrate 110. In this case, the electromagnetic shielding layer 120 may be formed on the transparent substrate 110 by a deposition process such as a sputter. In addition, the electromagnetic shielding layer 120 may be formed by stacking a multilayer as shown in FIG. 2. That is, the electromagnetic shielding layer 120 includes a first high refractive metal oxide layer 121, a first conductive metal oxide layer 122, a metal layer 123, a second conductive metal oxide layer 124, and a second high refractive metal oxide layer. It may be formed by repeatedly stacking one or more times in the order of (125). For example, as in the embodiment of the present invention, the electromagnetic shielding layer 120 may be formed of 16 layers, in addition to the first high refractive metal oxide layer 121, the first conductive metal oxide layer 122, The metal layer 123, the second conductive metal oxide layer 124, and the second high refractive metal oxide layer 125 may be formed in various combinations in one combination, and may be formed in various layers. There is no limit.

Here, the first and second high refractive metal oxide layers 121 and 125 may include Nb 2 O 5 . In this case, the first and second high refractive metal oxide layers 121 and 125 may be composed of only Nb 2 O 5 or may contain a small amount of other elemental components. In this case, as other element components, for example, TiO 2 , Ti 2 O 3 , Ti 3 O 5 , Ta 2 O 5 , ZrO 2 , CeO 2 , ZnS, or the like may be used. Each of the first and second high refractive metal oxide layers 121 and 125 may be a layer having the same composition or a layer having a different composition. In addition, the high refractive index metal oxide layers 121 and 125 may have a refractive index larger than that of air (about 1.5), and preferably 2.0 to 2.3.

In addition, the first conductive metal oxide layer 122 has ZnO as a main component, and serves to improve durability by protecting the metal layer 123 stacked on the upper surface thereof. In addition, the first conductive metal oxide layer 122 serves to improve the electromagnetic shielding performance by enhancing the electrical conductivity represented by the metal layer 123. The first conductive metal oxide layer 122 may be formed of an oxide containing a small amount of Al or Al 2 O 3 in ZnO, that is, AZO, but is not limited thereto.

The metal layer 123 is formed on the first conductive metal oxide layer 122. The metal layer 123 may be made of Ag or an alloy containing Ag as a main component (Ag of 90% or more by weight). At this time, Ag has excellent ductility and conductivity, has excellent properties of maintaining conductivity even when forming a thin film, and is inexpensive and has a merit of easily obtaining a transparent thin film because of less visible light absorption than other metals. However, the metal layer 123 may be made of a metal such as Au, Cu, Pt, or Pd in addition to Ag. In addition, each metal layer 123 may be formed of a layer having the same composition, or may be formed of a layer having a different composition.

In addition, the second conductive metal oxide layer 124 is a kind of blocker for preventing the electrical conductivity of the metal layer 123 from disappearing due to the oxygen plasma in the process of forming the second high refractive metal oxide layer 125 which is a subsequent process ( Blocker). That is, when the direct current sputtering method is used to form the second high refractive metal oxide layer 125 after the metal layer 123 is formed, the metal layer 123 may be damaged by the oxygen plasma. Layer 124 is formed between them to prevent damage to metal layer 123. However, the second conductive metal oxide layer 124 may be omitted.

The first conductive metal oxide layer 122 and the second conductive metal oxide layer 124 described above may be formed of a layer having the same composition, or may be formed of a layer having a different composition. That is, the first and second conductive metal oxide layers 122 and 124 form surface plasmons generated at the interface between the metal layer 123 and the first and second high refractive metal oxide layers 121 and 125. This reduces the visible light loss in the electromagnetic shielding layer 120 generated by light absorption by the surface plasmon, while reducing the visible light reflectance and increasing the wavelength band at which low reflectance can be obtained.

On the other hand, the electromagnetic shielding layer 120, as described above, the first high refractive metal oxide layer 121, the first conductive metal oxide layer 122, the metal layer 123, the second conductive metal oxide layer 124 and the second high refractive index The metal oxide layer 125 is repeatedly stacked one or more times in order, and the outermost layer thereof is formed of the second conductive metal oxide layer 124. That is, the low refractive index layer 130 is formed on the second conductive metal oxide layer 124 on top of the electromagnetic shielding layer 120.

The low refractive index layer 130 serves to lower the reflectance of the incident light and improve the transmittance. In addition, the low refractive index layer 130 serves to improve the durability and environmental resistance of the filter for display device 100. The low refractive index layer 130 is formed on the electromagnetic shielding layer 120, and more specifically, is formed on the second conductive metal oxide layer 124 forming the uppermost layer of the electromagnetic shielding layer 120. In addition, the low refractive index layer 130 has a contact angle of 1.4 to 1.8, and has a contact angle of 150 Hz or more to lower the reflectance of incident light, improve transmittance, and exhibit excellent water repellency.

Here, the low refractive index layer 130 is made of a low refractive material. That is, the low refractive index layer 130 may be made of any one of diamond like carbon (DLC), MgF 2 and SiO 2 , but may also be made of a low refractive material that exhibits the same or similar properties. The refractive material is not limited to DLC, MgF 2 and SiO 2 .

In this case, CF 4 or CF 6 may be doped into the DLC. The F component of CF 4 or CF 6 serves to adjust the refractive index and the absorption coefficient of the DLC. That is, as the content of the F component increases, the refractive index and the absorption coefficient decrease. Accordingly, in the embodiment of the present invention, CF 4 or CF 6 is backed to DLC at a concentration of 0.5wt% to 10wt% of DLC, and shows a low refractive index of 1.4 to 1.8 and an absorption coefficient of 0.01 to 0.1, for example, There is an effect of increasing the 92% of the visible light transmittance of 3% to 95%, while reducing the conventional reflectance of 8% to 5%. In addition, DLC exhibits a high contact angle due to the properties of the material to prevent contamination of the surface exposed to the outside, and scratches or film dropout can be prevented to ensure long-term reliability.

Hereinafter, the optical characteristic measurement results of the optical filter for display device according to an embodiment of the present invention will be described with reference to FIGS.

First, FIG. 3 is a graph showing changes in transmittance and reflectance for each wavelength band of an optical filter for a display device according to the prior art in which the low refractive index layer is formed on the electromagnetic shielding layer or the outermost layer is formed of a high refractive material. 3, it can be seen that the reflectance decreases as the transmittance increases. In the visible region, the reflectance of the 550 nm wavelength band was found to be approximately 5% to 6%. That is, it was observed that the visible light area to reflectance of the conventional optical filter for display devices is approximately 5% to 6%.

In contrast, FIG. 4 is a graph showing changes in transmittance and reflectance for each wavelength band of an optical filter for a display device having a low refractive index layer formed of DLC. Referring to FIG. 4, the transmittance and reflectance patterns for each wavelength band were found to be almost similar to those of FIG. 3. However, when the low refractive index layer 130 formed of DLC is formed, the reflectance of the 550 nm wavelength band was found to be 1% or less. That is, when the low refractive index layer 130 made of DLC is formed on the electromagnetic shielding layer 120, the measurement result shows that the reflectance can be lowered by approximately five times or more than before, whereas the transmittance is confirmed to increase further. It became.

5 is a graph showing changes in transmittance and reflectance for each wavelength band of an optical filter for a display device having a low refractive index layer formed of MgF 2 . Referring to FIG. 5, the transmittance and reflectance patterns for each wavelength band were found to be almost similar to DLC. When the low refractive index layer 130 formed of MgF 2 was formed, the reflectance of the 550 nm wavelength band was confirmed to be 1% or less. In addition, it was confirmed that the low refractive index layer 130 made of MgF 2 exhibits a lower reflectance and a higher transmittance than the low refractive index layer 130 made of DLC.

However, as shown in the photograph showing the water repellent characteristics of the optical filter for a display device according to an embodiment of the present invention of Figure 6, the optical filter for display device 100 according to an embodiment of the present invention has a low reflectance or In addition to the anti-reflective function, water repellent and antifouling functions are required, and according to the purpose, it is preferable to use either DLC or MgF 2 as the material forming the low refractive index layer 130. However, other low refractive materials having the same or similar characteristics besides these may be used as the material forming the low refractive index layer 130.

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: optical filter for display device 110: transparent substrate
120: electromagnetic shielding layer 121: first high refractive metal oxide layer
122: first conductive metal oxide layer 123: metal layer
124: second conductive metal oxide layer 125: second high refractive metal oxide layer
130: low refractive index layer

Claims (7)

Transparent substrate;
An electromagnetic shielding layer formed on the transparent substrate; And
A low refractive index layer formed on the electromagnetic shielding layer and made of a low refractive material;
Including,
The low refractive index layer,
An optical filter for display device, characterized by having a refractive index of 1.4 ~ 1.8 and a contact angle of 150 ㅀ or more.
The method of claim 1,
The electromagnetic shielding layer is formed by repeatedly stacking one or more times in the order of the first high refractive metal oxide layer, the first conductive metal oxide layer, the metal layer, the second conductive metal oxide layer, and the second high refractive metal oxide layer,
The second conductive metal oxide layer is laminated on the outermost layer of the electromagnetic shielding layer, the optical filter for display device.
The method of claim 2,
And the first and second high refractive metal oxide layers have a refractive index of 2.0 to 2.3.
4. The method according to any one of claims 1 to 3,
The low refractive index material is any one selected from the group of low refractive index candidates consisting of diamond like carbon (DLC), MgF 2 and SiO 2 .
The method of claim 4, wherein
CF 4 or CF 6 is doped in the DLC optical filter for a display device.
The method of claim 4, wherein
CF 4 or CF 6 in the DLC is doped at a concentration of 0.5wt% ~ 10wt% compared to the DLC optical filter for a display device.
The method according to claim 2 or 3,
And the first and second high refractive metal oxide layers include Nb 2 O 5 , and the first and second conductive metal oxide layers include AZO.
KR1020110012274A 2011-02-11 2011-02-11 Optical filter for display appratus KR20120092308A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110012274A KR20120092308A (en) 2011-02-11 2011-02-11 Optical filter for display appratus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110012274A KR20120092308A (en) 2011-02-11 2011-02-11 Optical filter for display appratus

Publications (1)

Publication Number Publication Date
KR20120092308A true KR20120092308A (en) 2012-08-21

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