KR100767687B1 - Filter for flat display panel and method for making the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter of a flat panel display panel, and more particularly, to a filter of a flat panel display panel for improving and protecting optical properties of the panel and a method of manufacturing the same. The present invention is formed of a synthetic resin, a substrate containing a plurality of transparent particles; It is configured to include an anti-reflection layer on the substrate.

Filters, panels, displays, substrates, resins.

Description

Filter for flat display panel and its manufacturing method {Filter for flat display panel and method for making the same}

1 is a perspective view showing an example of a filter of a conventional flat panel display panel.

2 is a perspective view showing an antireflection layer of a conventional filter.

3 is a perspective view showing an electromagnetic shielding layer of a conventional filter.

4 is a perspective view showing a color correction layer of a conventional filter.

5 is a perspective view showing another example of a filter of a conventional flat panel display panel.

6 is a cross-sectional view showing an embodiment of a filter of a flat panel display panel of the present invention.

7 is a cross-sectional view showing another embodiment of a filter of the flat panel display panel of the present invention.

8 is a cross-sectional view showing an embodiment of the electromagnetic shielding layer of the present invention.

9 is a cross-sectional view showing another embodiment of the electromagnetic shielding layer of the present invention.

10 is a cross-sectional view showing an embodiment of an antireflective layer of the present invention.

11 is a cross-sectional view showing another embodiment of the antireflective layer of the present invention.

<Brief description of the main parts of the drawing>

100 substrate 110 transparent particles

200: electromagnetic shielding layer 300: antireflection layer

400: light transmission control layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter of a flat panel display panel, and more particularly, to a filter of a flat panel display panel for improving and protecting optical properties of the panel and a method of manufacturing the same.

In general, a flat panel display panel is used for a display device having a thin structure, and representative examples thereof include a liquid crystal display (LCD), an organic light emitting diode (OLED) display, and a plasma display panel ( Plasma display panel (PDP) and field emission display (FED).

Among them, PDP is a type of light emitting device that displays an image by using a discharge phenomenon, and there is no need to mount an active device for each cell, so the manufacturing process is simple, the screen is easy to enlarge, and the response speed is fast. It is attracting attention as a display element of the image display apparatus which has a screen.

In the flat panel display panel such as the PDP, a filter for performing various functions is positioned on the front surface of the screen.

The function of the filter includes a color correction function for preventing reflection, improving contrast, and selectively absorbing such wavelengths when high visibility is observed at a specific wavelength.

Examples of such a filter include a glass filter disposed at regular intervals from the panel, a clear filter (film filter) attached to the front surface of the panel by an adhesive layer, and the like.

1 shows the structure of such a film filter. That is, the film filter is attached to the front glass 10 of the panel, and the anti-reflection layer 20 and the color correction layer 40, and the electromagnetic interference (EMI) to improve the optical characteristics ) May include an electromagnetic wave shielding layer 30.

The antireflective layer 20, as shown in Figure 2, on the PET film 21, a hard coating layer 22 for strength enhancement is located, on this hard coating layer 22, a high refractive index (23) layer And a low refrective index (24) layer in order to prevent reflection, and the PSA (pressure sensitive adhesive: 25) for adhesion below the PET film 21 is located.

In addition, as shown in FIG. 3, the electromagnetic wave shielding layer 30 has the adhesion layer 32 on the PET film 31, the copper mesh layer 33 is located on this adhesion layer 32, and the said anti-reflective layer Like (20), a pressure sensitive adhesive (PSA) 34 for adhesion is located under the PET film 31.

As shown in FIG. 4, the color correction layer 40 has a coating layer 42 having a color correction function on the PET film 41, and a PSA for adhesion to the front surface of the panel below the PET film 41. (pressure sensitive adhesive: 43) is placed. At this time, since the PSA 43 surface is directly bonded to the panel, a PSA 43 that can be reworked is used.

As described above, the antireflective layer 20, the electromagnetic shielding layer 30, and the color correction layer 40 forming the filter of the display panel each have three to five layers, and thus, a total of 12 or more multi-layered layers. It consists of, the production of such a filter requires a number of processes.

In addition, the antireflective layer 20, the electromagnetic wave shielding layer 30, and the color correction layer 40 are all repeatedly used in common with the PET films 21, 31, 41 and PSAs 25, 34, 43. In addition, since these materials are expensive materials, the manufacturing cost increases accordingly.

A flat panel display panel using such a film filter is vulnerable to shock from the outside. In addition, as the display panel becomes larger, such an impact becomes more problematic.

In particular, since the front surface of the PDP and the like may be relatively firm as compared to a display panel such as an LCD, breakage due to carelessness of a user may occur frequently.

Such a film filter is used by directly attaching a film filter to the front of the display panel as described above, the impact can be absorbed by the PET film constituting such a film filter, but the effect is weak.

In addition, the surface of the film may be deformed or fine cracks may be generated in the process of adhering the filter, thereby reducing the smoothness of the screen.

On the other hand, as shown in FIG. 5, the glass filter is provided with the anti-reflective layer 20, the electromagnetic shielding layer 30, the color correction layer 40, and the like on a separate glass substrate 50. Likewise, each layer comprises a PET film and a PSA.

Since such a glass filter uses tempered glass as a substrate, the protection from an external impact can be excellent. However, due to the weight of the tempered glass as the protective film, not only the weight of the entire display device is greatly increased, but also a double reflection image is generated, such that optical characteristics are deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and in the filter of the flat panel display panel, a filter of the flat panel display panel and a method of manufacturing the same which can protect the panel from external impact while improving the optical characteristics of the panel. To provide.

As a first aspect for achieving the technical problem of the present invention as described above, the present invention is formed of a synthetic resin, a substrate containing a plurality of transparent particles; It is achieved by including an anti-reflection layer located on the substrate.

The substrate is preferably formed by extrusion molding or injection molding with the transparent particles using any one of an acrylic resin, an epoxy resin, and a poly methyl methacrylate (PMMA) resin.

In addition, the substrate may include a light transmittance adjusting pigment including a near infrared absorption pigment, a near ultraviolet absorption pigment, a color correction pigment, and the like, and a light transmittance adjusting layer including the pigments may be formed separately.

The transparent particles are spherical or ellipsoidal particles having the same refractive index as the matrix of the substrate, and it is preferable to use cross-linked synthetic resin particles containing an elastic material.

On the other hand, between the substrate and the anti-reflection layer, it is preferable to further include an electromagnetic shielding layer for shielding electromagnetic waves (EMI) generated in the panel.

As a second aspect for achieving the technical problem of the present invention as described above, the present invention is formed of a synthetic resin, a substrate containing a plurality of transparent particles; It is achieved by including an electromagnetic shielding layer located in one plane of the substrate.

As a third aspect for achieving the technical problem of the present invention as described above, the present invention is formed of a synthetic resin, a substrate containing a plurality of transparent particles; It is achieved by including a light transmission control layer located in one plane of the substrate.

As a fourth aspect for achieving the technical problem of the present invention as described above, the present invention is achieved by forming a synthetic resin containing a pigment for light transmittance adjustment, comprising a plurality of transparent particles.

As a fifth aspect for achieving the technical problem of the present invention as described above, the present invention, the step of forming a substrate by molding a synthetic resin with transparent particles; Forming an electromagnetic shielding layer on the substrate; And forming an antireflection layer over the electromagnetic shielding layer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 6, the filter of the present invention is largely composed of a substrate 100, an electromagnetic shielding layer 200 formed on the substrate 100, and an antireflection layer 300.

The substrate 100 is formed of a synthetic resin, and preferably formed of a transparent acrylic resin, an epoxy resin, a polymethyl methacrylate (PMMA) resin, or the like.

The substrate 100 may be formed by extrusion molding or injection molding the transparent particles 110 together. In this case, it is preferable that the transparent particles 110 form a constant distribution or arrangement in the substrate 100.

The transparent particles 110 are particles having the same refractive index as that of the synthetic resin, which is the parent of the substrate 100. When the transparent particles 110 are manufactured together with the substrate 100, the transparent particles 110 have high transmittance without scattering or refraction of light. ) Does not deteriorate the optical characteristics of the filter or the panel in which it is installed.

The transparent particles 110 may use synthetic resin particles, and in particular, it is preferable to use cross-linked acrylic particles.

At this time, the transparent particles 110 may use spherical particles having a diameter of 0.1 to 1㎛, in addition to the particles having an ellipsoid or other shape.

In addition, the transparent particles 110 may include some elastic materials such as rubber.

The transparent particles 110 may connect materials constituting the substrate 100 to each other and reinforce the impact resistance of the substrate 100, and in particular, greatly improve the characteristics of torsion, warpage, and the like.

Therefore, the filter using the substrate 100 may have a very light impact resistance and very light than the filter using the tempered glass.

The thickness of the substrate 100 is preferably formed to a thickness of 0.1 to 10mm.

Meanwhile, the substrate 100 may include a pigment for light transmittance adjustment such as near infra-red (NIR) absorption pigments, near ultra-violet (NUV) absorption pigments, and other color correction pigments. Can be.

Depending on the type of flat panel display panel, near-infrared rays or near-ultraviolet rays may be generated when the panel is driven.

In particular, near infrared rays having a wavelength band of 800 to 1000 nm generated in the panel are used to control the display device and may interfere with the operation of a remote controller using infrared rays having a wavelength of approximately 974 nm. Inclusion can prevent or reduce near-infrared radiation below a certain amount.

In particular, in the case of the PDP panel, unnecessary near ultraviolet rays may be generated by the discharge in the discharge space.

In addition, in the PDP panel, neon light may be generated by neon gas in the discharge space by ultraviolet rays generated during discharge, or unnecessary visible light may be generated during the transition of other discharge gases.

Such unnecessary near-ultraviolet rays or other color visible rays may be removed or reduced to below a certain amount through the above-mentioned near ultra-violet (NUV) absorption pigments and color correction pigments.

In addition, the color correction pigment may absorb a specific wavelength of light to block or improve the specific color of the panel.

On the other hand, as described above, instead of including the light transmittance adjustment pigment in the substrate 100, as shown in Figure 7, it is also possible to form a separate light transmittance control layer 400 having the light transmittance control function.

The light transmittance control layer 400 may be formed by using a synthetic resin binder including a near infrared light (NIR) absorbing pigment, a near ultraviolet light (NUV) absorbing pigment, and other color correction pigments. Can be.

On the other hand, it may be made of a separate near-infrared absorbing layer, near-infrared absorbing layer, and color correction layer, respectively.

The light transmittance adjusting layer 400 is preferably formed between the electromagnetic shielding layer 200 and the anti-reflection layer 300.

Therefore, the anti-reflection layer 300 is positioned on the electromagnetic shielding layer 200 positioned below in the structure as shown in FIG. 6, and as shown in FIG. 7, when a separate light transmission control layer 400 is located, the light is provided. Located on the transmission control layer 400.

Meanwhile, the electromagnetic shielding layer 200 formed on the substrate 100 may shield electro-magnetic interference (EMI) that may occur in the panel.

As shown in FIG. 8, the electromagnetic shielding layer 200 includes at least one conductive layer 210 and a coating layer 220, and the conductive layer 210 is formed of copper (Cu), silver (Ag), or the like. It may be a network structure of a conductive material.

On the other hand, as the conductive layer 210, as shown in Figure 9, it may be formed of a transparent conductive layer 230 and a metal conductive layer 240 forming a film. In this case, the transparent conductive layer 230 may use a metal oxide such as indium tin oxide (ITO), and the metal conductive layer 240 preferably uses silver (Ag).

In this case, as shown in FIG. 9, the transparent conductive layer 230 and the metal conductive layer 240 may be formed in alternating two or more layers. In general, the metal conductive layer 240 may be formed more than the transparent conductive layer 230. It is thinly formed. The metal conductive layer 240 may exhibit a transparent characteristic under an opaque material or a predetermined thickness.

On the other hand, the anti-reflection layer 300 may be formed directly on the lower layer, or may be formed by laminating a separate film.

When the anti-reflection layer 300 is formed directly on the lower layer 200/400 such as the electromagnetic wave shielding layer 200 or the light transmission control layer 400, as shown in FIG. 10, on the hard layer 310. A high refractive index layer 320 is positioned, and a low refractive index layer 330 is positioned on the high refractive index layer 320.

On the other hand, when the anti-reflection layer 300 is attached to a separate film, as shown in Figure 11, the adhesive layer 340 attached to the lower layer (200/400), and the cured layer 310 positioned on the adhesive layer and , The PET film 350 positioned on the cured layer 310, the high refractive layer 320 and the low refractive layer 330 positioned on the PET film 350.

The adhesive layer 340 may be a pressure sensitive adhesive (PSA) or a reworkable PSA.

Meanwhile, the electromagnetic wave shielding layer 200 may be included in the substrate 100, which is formed of synthetic resin and includes a plurality of transparent particles 110, and the light transmission control layer may be formed in the substrate 100. It may be configured to include (400).

In addition, the substrate 100 including the plurality of transparent particles 110 may be formed of a synthetic resin containing a pigment for controlling light transmittance and may be used as a single body.

Hereinafter, an embodiment of the manufacturing method of the present invention will be described with reference to FIGS. 5 to 11.

First, the substrate 100 is manufactured by extrusion molding or injection molding the acrylic high-crosslinked transparent particles 110 together with at least one of an acrylic resin, an epoxy resin, and a PMMA resin, which are transparent synthetic resins.

At this time, as described above, the production of the substrate 100 may include a near infrared absorption pigment, a near ultraviolet absorption pigment, a color correction pigment.

The substrate 100 is formed to a thickness of 0.1 to 10mm.

An electromagnetic shielding layer 200 as shown in FIG. 8 or 9 is formed on the substrate 100 as described above.

As shown in FIG. 8, a conductive layer 210 having a network structure of a conductor such as copper is formed on the substrate 100. In this case, the conductive layer 210 of the network structure may be formed by forming a thin conductor and then etching, attaching the conductive layer 210 made of the network structure, or various other methods such as an inkjet method and an offset method. It can form by a method.

The electromagnetic shielding layer 200 is completed by covering the network structure of the conductive layer 210 or forming a covering layer 220 on the conductive layer 210 to fill a gap forming the network structure.

In this case, the electromagnetic shielding layer 200 may be grounded to a case of the device or the like when the display device is manufactured.

In addition, as illustrated in FIG. 9, the electromagnetic shielding layer 200 may be formed by repeatedly forming the transparent conductive layer 230 and the metal conductive layer 240 on the substrate 100.

That is, the transparent conductive layer 230 is formed of a transparent material such as ITO on the substrate 100, and the metal conductive layer 240 is formed of a material such as silver (Ag) thereon.

In this case, various thin film forming methods may be used, but in particular, it is preferable to use a sputter method.

The transparent conductive layer 230 and the metal conductive layer 240 are alternately formed, and may be formed two or more times.

The thickness of the electromagnetic wave shielding layer 200 is approximately 5 to 20 μm.

Thereafter, the light transmission control layer 400 may be selectively formed on the electromagnetic shielding layer 200 (see FIG. 7).

That is, in the case of manufacturing the substrate 100, when the near infrared absorption pigment, the near ultraviolet absorption pigment, and the color correction pigment are not manufactured, a separate light transmission control layer 400 is formed.

The light transmission control layer 400 dissolves a synthetic resin binder in a solvent, and includes a near infrared absorption pigment, a near ultraviolet absorption pigment, and a color correction pigment to prepare a material solution. 200) directly by coating and drying.

At this time, the composition of this material solution is approximately as follows.

That is, 60 to 95 wt.% Of organic solvent, 5 to 40 wt.% Of binder, and 0.01 to 5 wt.% Of the near-infrared absorbing pigment, near-ultraviolet absorbing pigment, and color correction pigment. .

When this material solution is dried, the organic solvent is removed and the pigment and binder remain.

On the other hand, the near-infrared absorbing pigment, the near-infrared absorbing pigment, and the color correction pigment may be mixed with a monomer or an oligomer and formed by thermosetting or UV curing. In this case, a thermal curing initiator or UV curing initiator should be included.

The thickness of the light transmission control layer 400 is formed to approximately 50 to 150㎛.

If the electromagnetic wave shielding layer 200 or if the separate light transmission control layer 400 is formed, the antireflection layer 300 is formed on the light transmission control layer 400.

When the anti-reflection layer 300 is directly formed, as shown in FIG. 10, a hard layer 310 and a high refractive index layer 320 are disposed on the electromagnetic wave shielding layer 200 or the light transmission control layer 400. ), And a low refractive index layer 330 are applied in sequence.

The antireflection layer 300 and the above-described layers may be formed using various wet coating methods such as spin coating, roll coating, spray coating, and bar coating.

On the other hand, when the anti-reflection layer 300 is attached to a separate film, as shown in Figure 11, the adhesive layer 340 is formed by attaching on the electromagnetic shielding layer 200 or the light transmission control layer 400.

Such an antireflection layer 300 is formed to a thickness of approximately 5 to 150㎛.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the present invention is not limited to the above embodiment, various modifications are possible, and various embodiments of the technical idea are all protected by the present invention. It belongs to the scope.

The present invention as described above has the following effects.

First, the weight of the filter is light and excellent impact resistance using a synthetic resin substrate containing transparent particles.

Second, the filter can be composed of a small number of layers, and the filter can be manufactured with a low number of processes and costs since it does not repeatedly use expensive materials.

Third, the use of the filter does not cause a problem of lowering optical characteristics such as double reflection and reduced smoothness.

Claims (26)

A substrate formed of a synthetic resin and including a plurality of transparent particles; And an anti-reflection layer disposed on one side plane of the substrate. The filter of claim 1, wherein the substrate is formed of any one of an acrylic resin, an epoxy resin, and a poly methyl methacrylate (PMMA) resin. The filter of claim 1, wherein the substrate is formed by extrusion molding or injection molding together with the transparent particles. The filter of claim 1, wherein the substrate comprises a pigment for controlling light transmittance. The filter of claim 4, wherein the light transmittance pigment comprises at least one of a near infrared ray absorption pigment, a near ultraviolet ray absorption pigment, and a color correction pigment. The filter of claim 1, wherein the substrate has a thickness of 0.1 to 10 mm. The filter of claim 1, wherein the transparent particles have the same refractive index as that of the substrate of the substrate. The filter of claim 1, wherein the transparent particles are spherical or ellipsoidal. The filter of claim 1, wherein the transparent particles include an elastic material. The filter of claim 1, wherein the transparent particles are high-crosslinked synthetic resin particles. The filter of claim 1, wherein the transparent particles have a diameter of about 0.1 μm to about 1 μm. The filter of claim 1, wherein the anti-reflection layer comprises a high refractive layer formed by directly applying the lower layer and a low refractive layer having a lower refractive index than the high refractive layer. The filter of claim 1, further comprising a light transmission control layer between the substrate and the anti-reflection layer. The method of claim 13, wherein the light transmission control layer, A filter of a flat panel display panel comprising at least one of a near infrared absorbing layer, a near ultraviolet absorbing layer, and a color correction layer. The method of claim 13, wherein the light transmission control layer, A filter for a flat panel display panel, which is formed of an organic binder containing at least one of a near infrared absorption pigment, a near ultraviolet absorption pigment, and a color correction pigment. The filter of claim 1, further comprising an electromagnetic shielding layer between the substrate and the antireflective layer. The method of claim 16, wherein the electromagnetic shielding layer, A conductive layer which is a network structure of a conductive material; And a coating layer covering the conductive layer. The method of claim 16, wherein the electromagnetic shielding layer, A filter for a flat panel display panel comprising a transparent conductive layer and a metal conductive layer. A substrate formed of a synthetic resin and including a plurality of transparent particles; And a electromagnetic shielding layer positioned on one side plane of the substrate. A substrate formed of a synthetic resin and including a plurality of transparent particles; And a light transmission control layer positioned at one plane of the substrate. A filter of a flat panel display panel formed of a synthetic resin containing a pigment for controlling light transmittance, and comprising a plurality of transparent particles. Forming a substrate by molding the synthetic resin together with the transparent particles; Forming an electromagnetic shielding layer on the substrate; And forming an anti-reflection layer on the electromagnetic shielding layer. 23. The method of claim 22, wherein the manufacturing of the substrate comprises: manufacturing a filter of a flat panel display panel including at least one of a near infrared absorption pigment, a near ultraviolet absorption pigment, and a color correction pigment in the synthetic resin matrix. Way. 23. The method of claim 22, wherein the manufacturing of the substrate is performed by extruding or injection molding the synthetic resin matrix together with the transparent particles. The method of claim 22, wherein after forming the electromagnetic shielding layer, A method of manufacturing a filter for a flat panel display panel, the method comprising: forming a light transmission control layer including at least one of a near infrared absorption pigment, a near ultraviolet absorption pigment, and a color correction pigment in an organic binder. The method of claim 22, wherein the synthetic resin is any one of an acrylic resin, an epoxy resin, and a polymethyl methacrylate (PMMA) resin.

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