JP2005251913A - Shielding material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shielding material by which reflection from outdoor daylight is suppressed, outgoing light from a PDP can efficiently be transmitted and a display characteristic of the PDP can be improved. <P>SOLUTION: A laminated metal film pattern 18 constituted of a first metal film 12 and a second metal film 16 is formed on a transparent base material 10. The lower face of the first metal film 12 shows a photoreflective achromatic color and an upper face and both sides of the second metal film 16 are blackened. A chromium film which exhibits silver is suitably used as the first metal film 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shield material, and more particularly to a shield material capable of blocking electromagnetic waves leaking from a plasma display panel (PDP).

  In recent years, PDPs (plasma display panels) having features such as a wide viewing angle, good display quality, and a large screen have been rapidly expanded in applications such as multimedia display devices.

  A PDP is a display device using gas discharge, which excites gas sealed in a tube by discharge and generates a line spectrum with a wide wavelength from the ultraviolet region to the near infrared region. A phosphor is disposed in the PDP tube, and this phosphor is excited by a line spectrum in the ultraviolet region to generate light in the visible region.

  Electromagnetic waves such as microwaves and ultra-low frequencies are generated by driving the PDP and leak to the outside, albeit slightly. Since the regulations for leakage of electromagnetic waves are stipulated in information equipment and the like, it is necessary to suppress the leakage of electromagnetic waves below a specified value.

  In addition, since the display screen of the PDP is smooth, the incident light is reflected when the light from the outside is incident on the display screen, and the contrast ratio of the screen is reduced. Therefore, the reflection of the incident light from the outside is suppressed. There is a need.

  Further, the near infrared wavelength emitted from the PDP is close to the wavelength (800 nm to 1000 nm) used in the remote control device and optical communication, and if these devices are operated near the PDP, malfunction may occur. Therefore, it is necessary to prevent leakage of near infrared rays from the PDP.

  For these purposes, a shield material is installed in front of the display screen of the PDP.

  A conventional shield material is basically composed of a transparent substrate and a mesh-like metal film pattern (copper film pattern) formed thereon as described in Patent Document 1, for example.

  When such a shield material is disposed on the PDP with the back side of the copper film pattern facing the display screen, the copper film pattern has a metallic luster, so that incident light from the outside is on the surface of the copper film pattern. It is reflected or the light emitted from the PDP is reflected on the back surface of the copper film pattern. For this reason, since the copper film pattern exhibits a reddish color, the display image of the PDP becomes reddish due to light reflection.

As a countermeasure, a shielding material that suppresses light reflection and suppresses redness of the display image of the PDP by blackening the entire surface including the back surface of the copper film pattern has been proposed (Patent Document 2).
JP-A-11-337702 JP 2002-9484 A

  However, in order to blacken the entire surface including the back surface of the copper film pattern, the manufacturing process becomes complicated, which may increase the manufacturing cost. Furthermore, when the entire surface including the back surface of the copper film pattern is blackened, reflection of the emitted light from the PDP is generally suppressed, and therefore, the transmittance of the emitted light from the PDP is decreased, and the display image is darkened. Is done.

  The present invention was created in view of the above problems, and a shielding material that can suppress the reflection of external light and efficiently transmit the light emitted from the PDP and improve the display characteristics of the PDP. The purpose is to provide.

  In order to solve the above-mentioned problems, the present invention relates to a shielding material, a laminated metal film pattern formed on a transparent base material and the transparent base material, and composed of a first metal film and a second metal film in order from the bottom. The lower surface of the first metal film exhibits a light-reflective achromatic color, and the upper surface and both side surfaces of the second metal film are blackened.

  In the shield material of the present invention, a laminated metal film pattern composed of a first metal film and a second metal film is formed on a transparent substrate. The first metal film (for example, chromium film) exhibits a light-reflective achromatic color (silver, etc.), and the upper surface and both side surfaces of the second metal film (for example, copper film) are blackened. Further, both side surfaces of the first metal film may be further blackened.

  Thus, in the shielding material of the present invention, the upper surface and both side surfaces of the laminated metal film pattern are blackened, and the lower surface (back surface) of the laminated metal film pattern exhibits a light reflective achromatic color (silver). Yes.

  Therefore, when the shielding material of the present invention is disposed on the front surface of the PDP so that the lower surface of the laminated metal film pattern faces the PDP display screen, the emitted light from the PDP display screen is emitted from the laminated metal film pattern. Reflected to some extent on the lower surface. For this reason, compared with the case where the whole surface including the lower surface of a metal film pattern is blackened, the transmittance | permeability in the shielding material of the emitted light from PDP can be improved. As a result, the luminous efficiency of the PDP is improved, so that the display screen of the PDP becomes bright and the display characteristics can be improved.

  In addition, since the second metal film (Cu film) constituting the laminated metal film pattern is blackened on the upper surface and both side surfaces, reflection of external light can be suppressed and display characteristics of the PDP can be improved. Can do. Furthermore, since the upper surface and both side surfaces of the second metal film (Cu film) are blackened and the lower surface is covered with the first metal film, the second metal film (Cu film) is reflected by reflection of external light or light emitted from the PDP. There is no possibility that the redness of the metal film (Cu film) is mixed in the display image of the PDP.

  In one preferred embodiment of the present invention, the transparent substrate is composed of a glass substrate and a first plastic film formed on the glass substrate via an adhesive layer, and the laminated metal film pattern is on the first plastic film. Is formed.

  Alternatively, the transparent substrate may be made of a first plastic film having an adhesive layer on the lower surface, and the laminated metal film pattern may be formed on the upper surface of the first plastic film. In this case, the adhesive layer on the lower surface of the first plastic film is directly attached to the display screen of the PDP.

  Moreover, in one suitable aspect of this invention, the near-infrared absorption layer formed above the transparent base material and the laminated metal film pattern, and the first antireflection layer formed above the near-infrared absorption layer are further included. Have. Furthermore, it is good also as an aspect by which the 2nd antireflection layer is formed above the surface in which the laminated metal film pattern of the transparent base material is not formed.

  As described above, according to the present invention, reflection of external light can be suppressed and the transmittance of light emitted from the PDP can be improved, so that the display characteristics of the PDP can be improved.

  Embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1-3 is sectional drawing which shows the manufacturing method of the shielding material of 1st Embodiment of this invention. In the manufacturing method of the shielding material according to the first embodiment of the present invention, first, a transparent first plastic film 10 (transparent substrate) such as a PET (polyethylene terephthalate) film is prepared as shown in FIG. . Thereafter, a first metal film exhibiting a light-reflective achromatic color (excluding black) is formed on the first plastic film 10. The light-reflective achromatic color is preferably silver, and as such a material for the first metal film, chromium (Cr), silver (Ag), or the like can be used. In this embodiment, the form which uses the Cr film | membrane which exhibits silver as a 1st metal film is illustrated.

  That is, as shown in FIG. 1B, a Cr film 12 and a nickel (Ni) film 14 are sequentially formed on the first plastic film 10 by sputtering or vapor deposition. The total film thickness of the Cr film 12 / Ni film 14 is set to 5 to 20 nm, for example. The Ni film 14 functions as an adhesion layer between the Cr film 12 and a Cu film to be formed later. Note that the Ni film 14 may be omitted when sufficient adhesion between the Cr film 12 and the Cu film to be formed later is obtained.

  Alternatively, instead of the Cr film 12 / Ni film 14, an alloy film of Cr and Ni having a film thickness of 5 to 20 nm may be formed by sputtering. In this case, the Ni film as the adhesion layer is omitted.

  Next, as shown in FIG. 1C, after forming a copper (Cu) seed film (not shown) on the Ni film 14, the Ni film 14 is formed by performing Cu plating on the Cu seed film by electrolytic plating. A Cu film 16 (second metal film) having a thickness of, for example, about 10 μm is formed thereon.

  Subsequently, as shown in FIG. 1D, the resist film 15 is patterned on the Cu film 16 by photolithography, and the Cu film 16, the Ni film 14, and the Cr film 12 are sequentially formed using the resist film as a mask. Etch. Thereafter, the resist film 15 is removed.

  As a result, as shown in FIG. 2A, a laminated metal film pattern 18 composed of the Cr film 12, the Ni film 14, and the Cu film 16 is formed in order from the bottom. The laminated metal film pattern 18 blocks PDP electromagnetic waves, and is patterned, for example, in a mesh shape. At the same time, a current-carrying portion 18 x connected to the laminated metal film pattern 18 is formed on the peripheral portion of the region that becomes the shield material of the first plastic film 10.

  Thereafter, as shown in FIG. 2 (b), the first plastic film 10 on which the laminated metal film pattern 18 is formed is subjected to a chemical conversion treatment with a mixed solution of a sodium chlorite aqueous solution and a caustic soda aqueous solution, thereby obtaining a laminated metal film. The upper surface and both side surfaces of the pattern 18 are blackened to form a black layer 18a.

  In the example of FIG. 2B, both side surfaces of the Cr film 12 and the Ni film 14 are also blackened, but it is sufficient that at least the upper surface and both side surfaces of the Cu film 16 are blackened.

  Thereby, the upper surface and both side surfaces of the laminated metal film pattern 18 are black due to the formation of the black layer 18 a, and the lower surface D of the laminated metal film pattern 18 becomes silver of the Cr film 12.

  As described above, in the present embodiment, the laminated metal film pattern 18 having the above-described configuration is easily formed by a sputtering method, a photolithography method, a wet process, or the like without using a complicated and special manufacturing method.

  As will be described later, when the shield material of the present embodiment is installed on the PDP with the lower surface D of the laminated metal film pattern 18 facing the display screen of the PDP, the entire surface including the lower surface D of the laminated metal film pattern 18 is covered. Since the light emitted from the PDP is reflected to some extent by the silver-colored Cr film 12 as compared with the case of blackening, the light emitted from the PDP is efficiently emitted to the outside.

  Next, as shown in FIG. 2 (c), a transparent glass substrate 20 (transparent base material) having a black frame layer 22 provided on the peripheral edge of one surface is prepared. Subsequently, the lower surface of the first plastic film 10 on which the laminated metal film pattern 18 is formed on the upper surface is attached to the surface of the glass substrate 20 on which the black frame layer 22 is not formed via the adhesive layer 24.

  Further, as shown in FIG. 2D, a second plastic film 30 such as a PET film having a first antireflection layer 32 formed on the upper surface and a near infrared absorption layer 34 formed on the lower surface is prepared. The second plastic film 30 has an ultraviolet (UV) absorption function. And the surface in which the near-infrared absorption layer 34 of this 2nd plastic film 30 was formed is stuck to the surface in which the laminated metal film pattern 18 of the 1st plastic film 10 was formed through the adhesion layer 24a. At this time, the second plastic film 30 is stuck so that a required portion of the energization portion 18x is exposed.

  In this way, the laminated metal film pattern 18 is embedded in the adhesive layer 24a, and the second plastic film 30 is attached with the upper surface of the first antireflection layer 32 being flattened.

  Thereafter, as shown in FIG. 3, a third plastic film 30a such as a PET film having a second antireflection layer 32a formed on the lower surface is prepared, and the upper surface of the third plastic film 30a is placed on the black frame layer of the glass substrate 20. It sticks on the surface in which 22 was formed through the adhesion layer 24b.

  Thus, the shield material 1 according to the embodiment of the present invention is completed.

  As shown in FIG. 3, in the shielding material 1 of the present invention, the first plastic film 10 is formed on the upper surface of the glass substrate 20 via the adhesive layer 24. A black frame layer 22 is provided on the peripheral edge of the lower surface of the glass substrate 20. Further, on the first plastic film 10, a laminate composed of a silver-colored Cr film 12 (first metal film), a Ni film 14 (adhesion layer), and a Cu film 16 (second metal film) in order from the bottom. A metal film pattern 18 is formed.

  A black layer 18a is formed on the upper surface and both side surfaces of the laminated metal film pattern 18, and these surfaces are black. In addition, the Cr film 12 is disposed at the lowermost part of the laminated metal film pattern 18, and the lower surface D of the laminated metal film pattern 18 has a silver color. In addition, a conductive portion 18 x made of the same material as the laminated metal film pattern 18 and connected to the laminated metal film pattern 18 is provided on the peripheral edge portion of the first plastic film 10.

  Further, on the first plastic film 10 and the laminated metal film pattern 18, the second plastic film 30 provided with the first antireflection layer 32 on the upper surface and the near infrared absorption layer 34 on the lower surface has the adhesive layer 24a. Is formed through. The second plastic film 30 has an ultraviolet (UV) absorption function. The second plastic film 30 is formed such that a required portion of the energization portion 18x connected to the laminated metal film pattern 18 is exposed, and the energization portion 18x is electrically connected to an external terminal. Note that the near-infrared absorbing layer 34 may include a color material that suppresses neon light emission.

  Further, on the lower surface of the glass substrate 20 (the surface on which the black frame layer 22 is provided), the surface on which the second antireflection layer 32a of the third plastic film 30a on which the second antireflection layer 32a is formed is not formed. Is formed via the adhesive layer 24b.

  The shield material 1 of the present embodiment has such a configuration, and the surface of the glass substrate 20 on which the laminated metal film pattern 18 is not formed becomes the display screen side of the PDP, and the laminated metal film pattern 18 of the glass substrate 20. It is installed in front of the display screen of the PDP so that the surface on which the is formed is on the side of the person operating the PDP. And in order to prevent electrification, the energization part 18x exposed to the peripheral part is electrically connected to the ground terminal of the housing of the PDP.

  Since the laminated metal film pattern 18 is a good conductor mainly composed of the Cu film 16, electromagnetic waves such as microwaves and ultra-low frequencies emitted from the display screen of the PDP can be blocked. In addition, since the laminated metal film pattern 18 and the energizing portion 18x are formed with the black layer 18a on the upper surface and both side surfaces, reflection of incident light from the outside is reduced, and the display performance of the PDP can be improved.

  Furthermore, in the present embodiment, the Cr film 12 whose lower surface D is not blackened is disposed at the lowermost part of the laminated metal film pattern 18 so that the lower surface of the laminated metal film pattern 18 exhibits the silver color of the Cr film 12. It has become. Thereby, the emitted light from the display screen of the PDP is reflected to some extent on the lower surface D of the Cr film 12 of the laminated metal film pattern 18, so that the entire surface including the lower surface D of the laminated metal film pattern 18 is blackened. As compared with the above, the transmittance of the emitted light from the display screen of the PDP can be improved. For this reason, since the emitted light of the PDP is efficiently emitted to the outside of the shield material, the display image of the PDP becomes bright and the display characteristics can be improved.

  Furthermore, since the upper surface and both side surfaces of the Cu film 16 constituting the laminated metal film pattern 18 are blackened, reflection of external light can be suppressed and display characteristics of the PDP can be improved. Moreover, since the upper surface and both side surfaces of the Cu film 16 are blackened and the lower surface thereof is covered with the Ni film 14 and the Cr film 12, even if the emitted light from the external light or PDP is reflected by the Cu film 16, There is no possibility that the display image of the PDP is reddish due to the reddishness of the Cu film 16.

  In addition, since the shielding material 1 of the present embodiment includes the first and second antireflection layers 32 and 32a on the outermost surfaces of both surfaces, reflection of light emitted from outside light or PDP can be suppressed. The contrast ratio of the display image can be improved. Furthermore, since the shielding material 1 of the present embodiment includes the near-infrared absorbing layer 34, there is no risk of malfunction even if a remote control device or the like is operated near the PDP.

  Furthermore, since the second plastic film 30 on which the first antireflection layer 32 and the near-infrared absorbing layer 34 are formed has an ultraviolet (UV) absorbing function, the shielding material 1 of this embodiment has an ultraviolet ray harmful to the human body. Can be cut off.

  Moreover, in the shielding material 1 of this embodiment, you may make the near-infrared absorption layer 34 contain the pigment of the color which suppresses light emission of neon as needed. In this case, the neon orange light emission is corrected and the color display performance of the PDP can be improved.

  In the above-described embodiment, the first metal film exhibiting the light-reflecting achromatic color is exemplified by the Cr film or the Cr / Ni alloy film exhibiting a silver color. However, light such as gray near black, gray near white, or white is used. Any metal film that exhibits a color that reflects to some extent can be applied to the present invention.

  Further, the first plastic film 10 may be omitted in FIG. 3 and the laminated metal film pattern 18 may be formed on the glass substrate 20.

(Second Embodiment)
FIG. 4 is a cross-sectional view showing a shield material according to a second embodiment of the present invention.

  As shown in FIG. 4, the shield material 1a of the second embodiment is the same as that of the shield material 1 of FIG. 3 of the first embodiment, but is the glass substrate 20, the adhesive layer 24b provided below the glass substrate 20, and the third plastic film 30a. In addition, the second antireflection layer 32a is omitted. The other elements are the same as those in FIG.

  In the shield material 1a of the second embodiment, the exposed surface of the adhesive layer 24 formed on the lower surface of the first plastic film 10 is directly attached to the display screen of the PDP to become a PDP shield material.

  The shield material 1a of the second embodiment has the same effect as that of the first embodiment.

FIG. 1 is a sectional view (No. 1) showing a manufacturing method of a shield material according to a first embodiment of the present invention. FIG. 2: is sectional drawing (the 2) which shows the manufacturing method of the shielding material of 1st Embodiment of this invention. FIG. 3 is a cross-sectional view showing the shield material according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing a shield material according to a second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st plastic film (transparent base material), 12 ... Cr film (1st metal film), 14 ... Ni film, 16 ... Cu film (2nd metal film), 18 ... Laminated metal film pattern, 18a ... Black layer , 18x ... current-carrying part, 20 ... glass substrate (transparent substrate), 22 ... black frame layer, 24, 24a, 24b ... adhesive layer, 30 ... second plastic film, 30a ... third plastic film, 32 ... first antireflection Layer, 32a ... second antireflection layer, 34 ... near-infrared absorbing layer.

Claims (9)

A transparent substrate;
A laminated metal film pattern formed on the transparent base material and composed of a first metal film and a second metal film in order from the bottom;
A shield material, wherein the lower surface of the first metal film exhibits a light-reflective achromatic color, and the upper surface and both side surfaces of the second metal film are blackened.   The shield material according to claim 1, wherein both side surfaces of the first metal film are further blackened.   3. The shield material according to claim 1, wherein the first metal film is a chromium film having a silver color or an alloy film of chromium and nickel, and the second metal film is a copper film.   When the first metal film is the chromium film, a nickel film is formed on the chromium film, and the chromium film and the nickel film constitute the first metal film. The shield material according to claim 3.   The transparent substrate is composed of a glass substrate and a first plastic film formed on the glass substrate via an adhesive layer, and the laminated metal film pattern is formed on the first plastic film. The shield material according to any one of claims 1 to 4, wherein:   The said transparent base material consists of a 1st plastic film provided with the adhesion layer in the lower surface, The said laminated metal film pattern is formed in the upper surface of the said 1st plastic film, The Claim 1 thru | or 4 characterized by the above-mentioned. The shield material according to any one of the above. A near infrared absorbing layer formed above the transparent substrate and the laminated metal film pattern;
The shielding material according to claim 1, further comprising a first antireflection layer formed above the near infrared absorption layer.   The shielding material according to claim 7, wherein a second antireflection layer is further formed above a surface of the transparent base material on which the laminated metal film pattern is not formed. The near-infrared absorbing layer is formed on one surface of the second plastic film, and the first antireflection layer is formed on the other surface of the second plastic film;
The near-infrared absorbing layer is on the laminated metal film pattern side, and the second plastic film is stuck on the transparent substrate and the laminated metal film pattern via an adhesive layer. The shielding material according to claim 7 or 8.

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