JPH10282897A - Electromagnetic wave shield filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the electromagnetic wave shield filter which can effectively suppress an interference pattern on a display screen at low cost. SOLUTION: On a light-transmissive filter substrate 1 which uses a plastic plate formed of transparent acrylic resin, a conductive layer 6 is formed of a metal vapor-deposited film by a vacuum vapor-depositing method using copper and on it, a printing-method top coat layer 7 is formed by using polyester resin. On the entire surface of the top coat layer 7, silk screen printing is carried out by using negative resist ink and the surface is exposed to a spacer pattern and then etched to manufacture the electromagnetic wave shield filter having columnar spacers 2 conforming with the conductive layer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for various display screens such as LCD (Liquid Crystal Display), PDP (Plasma Display Panel), FED (Field Emission Display), CRT (CRT), LED (Light Emitting Diode Display). And an electromagnetic wave shielding filter.

[0002]

2. Description of the Related Art In various displays, an electromagnetic wave of a predetermined frequency is cut or attenuated by a plastic or glass material in order to appropriately control an optical or electromagnetic wave emitted from a display screen 3. The electromagnetic wave shielding filter having the function of causing the electromagnetic wave shielding filter to be provided is provided on the display screen 3 at intervals by a frame-shaped spacer 7 provided only on the periphery (FIG. 2).
reference). As the electromagnetic wave shield filter, there is a filter in which a net-like conductive layer 6 is formed on the translucent filter substrate 1 and a top coat layer is formed on the entire surface.

[0003]

However, the radiation of heat from the display, which is an electronic device, causes the electromagnetic wave shielding filter to be heated and deformed and warped. It was in a concave shape and was in so-called surface contact with the display screen 3. An optical interference pattern called Newton's ring was not generated at the place where the surfaces were in contact, and the display quality was deteriorated such that the display on the display screen 3 was difficult to see (see FIG. 2). Therefore, there has been a method in which an adhesive is applied to the other surface of the anti-Newton ring film (AN film) having a mat shape on one side, and is attached to the conductive layer side surface of the electromagnetic wave shield filter (see FIG. 3). In this method, even if the electromagnetic wave shield filter is warped, the mat-shaped surface makes point contact with the display screen 3, so that an optical interference pattern does not occur. However, since the film is interposed entirely between the electromagnetic wave shield filter and the display screen 3, light is scattered and light transmittance from the display screen is reduced. Further, there is a disadvantage that the sharpness of the image on the display screen 3 is reduced. Further, since the AN film was processed into a mat shape, the film cost was high. Also, it takes time and effort to adhere the AN film to the entire surface of the electromagnetic wave shield filter. Further, dirt and dust are easily trapped between the AN film and the electromagnetic wave shield filter, and the yield of products is reduced, and as a result, the cost of the electromagnetic wave shield filter is often high.

Accordingly, it is an object of the present invention to provide an electromagnetic wave shielding filter capable of effectively suppressing an interference pattern generated on a filter on a display screen at low cost.

[0005]

The electromagnetic wave shielding filter of the present invention is basically an electromagnetic wave shielding filter arranged on a display screen, and is formed on a net-like conductive layer formed on a light-transmitting filter substrate. The spacers were formed in agreement.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic wave shielding filter according to the present invention will be described in detail with reference to the drawings. FIG.
1 is a conceptual sectional view showing an embodiment of the electromagnetic wave shield filter of the present invention, FIGS. 2 and 3 are conceptual sectional views showing an example of a conventional electromagnetic wave shield filter, and FIGS. It is a conceptual plan view showing an example. 1 is a translucent filter substrate, 2 is a spacer, 3 is a display screen, 4 is a display, 5 is a frame spacer, 6 is a conductive layer, and 7 is a top coat layer.

The light-transmitting filter substrate 1 has a mesh-shaped conductive layer 6 formed thereon, and appropriately cuts or attenuates optical or electromagnetic frequency waves radiated from the display screen 3. . The translucent filter substrate 1 is made of transparent plastics or transparent glass having a thickness of 1 mm to 10 mm. The light-transmitting filter substrate 1 has a flat surface or a curved surface. Examples of the transparent plastics include acrylic resin and polycarbonate resin having excellent transparency. Translucent filter substrate 1
May be in the form of a plate, a film, or a sheet. The reticulated conductive layer 6 is made of a material such as copper and may be formed by a vacuum deposition method or the like.

The top coat layer 7 may be formed on the entire surface of the conductive layer 6. The material of the top coat layer 7 is polyester resin or the like, and may be formed by various printing methods or the like, or a film may be attached.

The spacer 2 is formed directly on the conductive layer 6 or on the top coat layer 7 so as to coincide with the conductive layer 6. That is, the spacer 2 is formed such that at least a part thereof is inside the width of the conductive layer 6. The spacer 2 may extend beyond the width of the conductive layer 6. Spacer 2
May completely match the width of the conductive layer 6. Further, the width of the spacer 2 may be smaller than the width of the conductive layer 6. Note that the coincidence does not necessarily mean that the spacer 2 and the conductive layer 6 are in direct contact. This includes that, for example, a top coat layer 7 may exist between the spacer 2 and the conductive layer 6. Spacer 2
It may be formed only at the center of the side of the display screen 3 of the translucent filter substrate 1. The central portion is a portion that comes closest to the display screen when it is heated by heat radiation from the display to be deformed and warped. When the translucent filter substrate 1 is used by being laid horizontally, the vicinity of the center of gravity of the translucent filter substrate 1 corresponds. When the translucent filter substrate 1 is used standing upright, the vicinity of a portion shifted downward from the center of gravity of the translucent filter substrate 1 corresponds. The spacer 2 is obtained by forming the spacer 2 on the translucent filter substrate 1 by printing, coating, or the like using a photosensitive resin, a synthetic resin, rubber, or the like. Spacer 2
Is preferably transparent.

The spacer 2 may be composed of a group of fine dots that do not protrude from the width of the conductive layer 6. The pitch of the dot spacers 2 can be set to 10 μm to 10 mm. The height of the dot spacer 2 is 1
It can be set to μm to 1 mm. The diameter of the horizontal section of the dot spacer 2 can be set to 1 μm to 3 mm. The dot spacer 2 may be formed by a combination of screen printing and photo process printing,
Alternatively, either one may be formed alone.

The spacer 2 may be a wall having a width that does not protrude from the width of the conductive layer 6 (see FIG. 6). The height of the wall-shaped spacer 2 can be set to 1 μm to 1 mm. The diameter of the horizontal cross section of the wall-shaped spacer 2 is 1 μm or more.
It can be set to 3 mm. Wall-shaped spacer 2
May be formed by a combination of screen printing and photo process printing, or may be formed alone.

In using the electromagnetic wave shield filter of the present invention, the surface of the electromagnetic wave shield filter on which the spacer 2 is formed is disposed so as to face the display screen 3 and is provided only around the display screen 3. It is preferable that the frame-shaped spacer 5 be installed so that the translucent film substrate 1 of the electromagnetic wave shielding filter and the display screen 3 are not in surface contact. The frame-shaped spacer 5 may also serve as the spacer 2 and the function of the grounding conductor. In this case, the frame-shaped spacer 5
Need to be in contact with the conductive layer 6 so as to conduct. In the installation completed state, the distal end of the spacer 2 may be in contact with the display screen 3 or may be separated therefrom. Display screen 3 is LCD, PDP, FED, C
It is a flat or curved display screen that can display normal characters such as RT and LED, moving images or still images.

According to the present invention, even if the light-transmitting filter substrate 1 is heated by heat radiation from the display 4 and deformed and warped, only the tip end of the spacer 2 contacts the display screen, and the light-transmitting filter substrate 1 is in contact with the display screen. The translucent filter substrate 1 does not come into surface contact with the display screen 3 because it serves as a support for preventing the surface of the transparent filter substrate 1 from coming into surface contact with the display screen 3. In particular, the center of the translucent filter substrate 1 is more likely to be warped, bent or sagged due to the weight of the translucent filter substrate 1 or static electricity, and is easier to approach the display screen 3 than the peripheral portion. Dot spacer 2 in the center
Is preferably formed so that the pitch is dense, and the peripheral portion is formed so that the pitch is coarse. This is effective because the dot spacer 2 that can effectively prevent surface contact can be formed.

[0014]

EXAMPLE As a light-transmitting filter substrate, a plastic plate made of a transparent acrylic resin and having a thickness of 3 mm and a size of 10 cm long × 15 cm wide was used. The conductive layer was a metal deposited film formed by a vacuum deposition method using copper, and the thickness was 0.2 μm. The top coat layer was formed on the conductive layer (excluding the portion serving as the ground electrode) by a printing method using a polyester resin. Formed by silk screen printing on the surface of the top coat layer using a negative resist ink as a spacer, etched after exposing the spacer pattern so that the bottom part has a substantially conical shape with a diameter of 30 μm and a height of 10 μm. An electromagnetic shield filter having a spacer corresponding to the layer was prepared. In the electromagnetic wave shield filter of this embodiment, even when the filter is placed on a display screen and used as a display panel of a lighting fixture, there is no portion that comes into surface contact with the display screen, and an optical interference pattern such as a Newton ring occurs. I never did. In addition, since at least a part of the spacer was hidden by the conductive layer, the appearance of the spacer was not remarkable and the design was good.

[0015]

The electromagnetic wave shielding filter of the present invention is an electromagnetic wave shielding filter arranged on a display screen, wherein a spacer is formed on a translucent filter substrate on a mesh-like conductive layer formed on the display screen side. Is formed.

Therefore, since the electromagnetic wave shield filter and the display screen do not come into surface contact with each other, no optical interference pattern occurs, and the display on the display screen is easy to see. Further, since the spacer interposed between the light-transmitting filter substrate and the display screen is formed only in the minimum necessary portion, the influence on the decrease in light transmittance from the display screen is small. In addition, the effect on the sharpness of the image on the display screen is small. In addition, no dust or dirt is trapped, and the cost is reduced.
In addition, since the spacer is formed on the conductive layer in conformity with the conductive layer, the spacer is hidden by the conductive layer and is not seen from a gap between the conductive layers, so that the appearance is improved in design.

[Brief description of the drawings]

FIG. 1 is a conceptual sectional view showing one embodiment of an electromagnetic wave shield filter of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of a conventional electromagnetic wave shield filter.

FIG. 3 is a cross-sectional view illustrating an example of a conventional electromagnetic wave shield filter.

FIG. 4 is a conceptual plan view showing an embodiment of the electromagnetic wave shield filter of the present invention.

FIG. 5 is a conceptual plan view showing an embodiment of the electromagnetic wave shield filter of the present invention.

FIG. 6 is a conceptual plan view showing an embodiment of the electromagnetic wave shield filter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Translucent filter substrate 2 Spacer 3 Display screen 4 Display 5 Frame-shaped spacer 6 Conductive layer 7 Top coat layer

Claims (5)

[Claims] 1. An electromagnetic wave shield filter disposed on a display screen, wherein a spacer is formed in conformity with a mesh-like conductive layer formed on the display screen side of the translucent filter substrate. Electromagnetic shield filter. 2. The electromagnetic wave shield filter according to claim 1, wherein the spacer is a dot spacer. 3. The electromagnetic wave shield filter according to claim 1, wherein the spacer is a wall-shaped spacer. 4. The electromagnetic wave shield filter according to claim 1, wherein the pitch of the spacers is dense at the center of the light-transmitting filter substrate and coarse at the periphery. 5. The electromagnetic wave shield filter according to claim 1, wherein the spacer is formed at a central portion of the translucent filter substrate.