KR101052738B1 - Optical member for display device, method for manufacturing same and filter and display device for display device including same - Google Patents

Abstract

An optical member for a display device capable of improving contrast ratio in a bright room and preventing a moiré phenomenon, a method of manufacturing the same, and a filter and a display device for a display device including the same are provided. An optical member for a display device is formed on a light transmission support, and includes a light converging portion including a plurality of beads having an elliptical cross section, and a space between the light transmission supporting portion and the light concentrating portion and forming a space between the light concentrating portions. It is filled with the external light shielding portion.

Display, Filter, Bead, Brightness, Contrast Ratio

Description

Optical member for display apparatus, method for manufacturing the same, and filter and display device for display device including the same {Optical member for display apparatus, method for fabricating the same, filter for display device and display device employing the same}

1 is an exploded perspective view showing a PDP apparatus according to an embodiment of the present invention.

2 is a cross-sectional view of a PDP filter according to an embodiment of the present invention.

3A to 3C are perspective views of an optical member according to an embodiment of the present invention.

4 is a cross-sectional view of a PDP filter according to another embodiment of the present invention.

5A and 5B are cross-sectional views of a PDP filter according to another embodiment of the present invention.

6 is a process flowchart showing a manufacturing method of an optical member according to an embodiment of the present invention in order.

7 to 10C are perspective views of the intermediate structure during the manufacturing process of the optical member according to an embodiment of the present invention.

11A is a perspective view illustrating a PDP device according to an embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along the line BB ′ of FIG. 11A.

12 is an exploded perspective view showing a PDP apparatus according to another embodiment of the present invention.

13 is an exploded perspective view showing a PDP apparatus according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: PDP device 110: case

120: drive circuit board 130: panel assembly

140: PDP filter 150: cover

240: optical member 241: light transmission support

243: light condenser 245: external light blocking unit

250: filter base 260: diffusion layer

270: color correction layer 711: front substrate

712: sustain electrode 713: bus electrode

714: dielectric layer 715: dielectric protective film

721: back substrate 722: address electrode

723: dielectric layer 724: partition wall

725: phosphor layer 725R: red phosphor layer

725G: green phosphor layer 725B: blue phosphor layer

726: discharge cell 811: diffuse reflection surface

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member for a display device, a method for manufacturing the same, a filter for a display device and a display device including the same, and more particularly, to improve contrast ratio in light room, and to moire The present invention relates to an optical member for a display device capable of preventing a phenomenon, a method of manufacturing the same, a filter for a display device, and a display device including the same.

Compared to the Cathode-Ray Tube (CRT) device that represents the conventional display device, the Plasma Display Panel (PDP) device can satisfy both the size and the thickness of the display device. have.

However, due to its driving characteristics, the PDP device has a high emission amount of electromagnetic waves and near infrared rays, high surface reflection of the phosphor, and color purity due to the orange light emitted by the enclosed gas neon (Ne), helium (He), or xenon (Xe). Does not reach the cathode ray tube.

Therefore, it is required to prevent the emission of electromagnetic waves and near infrared rays emitted from the PDP apparatus below a predetermined value. To this end, in order to shield electromagnetic waves and near infrared rays, while reducing reflected light and improving color purity, a PDP filter having a function such as electromagnetic shielding, near infrared shielding, light surface reflection prevention and / or color purity improvement is employed.

Conventional PDP filters do not prevent external light from passing through the PDP filter into the panel assembly under bright conditions, that is, bright room conditions. Therefore, the external environmental light introduced into the panel assembly overlaps with the light generated in the discharge cells in the panel assembly, and thus the contrast ratio of the bright and dark is lowered and the screen display capability of the PDP device is reduced.

In addition, in the case of the conventional PDP device, the moiré phenomenon occurs due to the periodic pattern interference between the discharge cells constituting the PDP device and the PDP filter, thereby reducing the screen display capability of the PDP device.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an optical member for a display device capable of improving the contrast ratio of a bright room of a display device and preventing a moiré phenomenon.

Another object of the present invention is to provide a method of manufacturing the optical member for a display device.

Another object of the present invention is to provide a filter for a display device including such an optical member.

Another object of the present invention is to provide a display device including the optical member for such a display device.

The technical objects of the present invention are not limited to the above-mentioned technical problems, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided an optical light transmitting support for a display device, a light converging portion formed on the light transmitting support, and including a plurality of beads having an elliptical cross section. It includes an external light blocking unit is formed to fill the space between the support and the light focusing portion.

Filter for a display device according to an embodiment of the present invention for achieving the other technical problem is formed on the filter base and one surface of the filter base, the light transmission support, formed on the light transmission support and has an elliptical cross section An optical member for a display device includes a light converging part including a plurality of beads and an external light blocking part formed between the light transmitting support part and the light converging part and filling a space between the light converging parts.

According to another aspect of the present invention, there is provided a display apparatus including a transparent front substrate and a rear substrate coupled to face each other and a plurality of cells between the front substrate and the rear substrate. And an optical member for a display device and an optical member for a display device, which are directly attached to the front substrate of the panel assembly, and which are disposed opposite to the optical member for the display device, and which have an anti-reflection function and / or a function of shielding electromagnetic waves, near infrared rays or a combination thereof. And a filter for a display device having the same.

According to another aspect of the present invention, there is provided a display apparatus including a transparent front substrate and a rear substrate coupled to face each other and a plurality of cells between the front substrate and the rear substrate. And a filter for display device as described above disposed opposite the front substrate of the panel assembly.

According to another aspect of the present invention, there is provided a method of manufacturing an optical member for a display device, the method comprising: preparing a light transmission support, forming an opaque fluidized layer on one surface of the light transmission support, and the opacity Arranging a plurality of beads on the fluidized layer to form a light concentrator, and curing the opaque fluidized layer to form an external light blocker shaped to fill the light concentrator and the light transmission support.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. Also, as used herein, "top", "top", "top" or "bottom", "bottom" of a layer or film includes the case of intervening another layer or film.

In addition, unless there is another definition for the terminology used herein, all terms (including technical and scientific terms) used herein have a meaning that can be commonly understood by those skilled in the art. Could be used. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

In addition, in the present specification, a PDP filter and a PDP device are described as an example of a display device filter and a display device, but the present invention is not limited thereto, and an organic light emitting diode (OLED) device, a liquid crystal display (LCD) device, It can be applied to a large display device such as a field emission display (FED) device, a small mobile display device such as a personal digital assistant (PDA), a small game machine display window, a mobile phone display window, a flexible display device, and the like. . In particular, the present invention can be effectively applied to outdoor display devices having strong external environmental light and display devices installed indoors of public facilities.

First, a PDP apparatus according to an embodiment of the present invention will be described with reference to FIG. 1 is an exploded perspective view showing a PDP apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the structure of the PDP apparatus 100 according to an exemplary embodiment of the present invention includes a case 110, a cover 150 covering an upper portion of the case 110, and a drive accommodated in the case 110. The circuit board 120 includes a panel assembly 130 including a discharge cell in which a gas discharge phenomenon occurs, and a PDP filter 140. The PDP filter 140 includes a conductive layer formed of a material having excellent conductivity on the transparent substrate, and the conductive layer is grounded to the case 110 through the cover 150. That is, before the electromagnetic wave generated from the panel assembly 130 reaches the user, it is grounded to the cover 150 and the case 110 through the conductive layer of the PDP filter 140.

Hereinafter, a PDP filter that shields electromagnetic waves, near infrared rays, external ambient light, and the like will be described first with reference to FIG. 2, and then a PDP device including such a PDP filter and a panel assembly will be described. 2 is a cross-sectional view of a PDP filter according to an embodiment of the present invention.

As shown in FIG. 2, the PDP filter 140 according to an embodiment of the present invention focuses or blocks light with the filter base 250 on which the layers having various shielding functions are formed on the transparent substrate 251. It includes an optical member 240 having a.

First, the optical member will be described with reference to FIGS. 2 and 3A to 3C. 3A to 3C are perspective views of an optical member according to an embodiment of the present invention. As shown in FIGS. 2 and 3A to 3C, the optical member 240 according to the exemplary embodiment of the present invention includes a light transmission support part 241, a light focusing part 243, and an external light blocking part 245. do.

The light transmission support part 241 is a plate-like support made of a transparent material that transmits visible light. For example, polyethylene terephthalate (PET), polycarbonate (PC), and polyvinyl chloride (PVC) Or the like.

On the light transmission support part 241, a light converging part 243 composed of a plurality of beads 242 is formed. The light concentrator 243 focuses the light by allowing the visible light 310 generated from the discharge cells of the panel assembly 130 of FIG. 1 to pass through the bead 242. The shape of the bead 242 is the rate at which visible light 310 generated from the discharge cells of the panel assembly (130 in FIG. 1) is emitted through the optical member to the outside of the PDP device (100 in FIG. 1) (hereinafter referred to as "light"). It is not particularly limited as long as it is a shape capable of increasing the transmittance ”, but for example, the cross section may have an elliptical shape. When the cross section of the bead 242 is elliptical, the area where the bead 242 is exposed by the external light blocking unit 245 becomes wider than when the cross section is elliptical, which in turn increases the light transmittance of the PDP filter 140. Let's do it.

As shown in FIG. 3A, the bead 242 of the light converging unit 243 selects an arbitrary bead 242 and connects the focal points of the beads 242 that are adjacently surrounded by the connecting line. For example, the beads 242 can be arranged to be square. In this case, in order to increase the light transmittance, the beads 242 may be disposed at positions corresponding to the respective discharge cells of the panel assembly (130 of FIG. 1).

In addition, when the bead 242 of the light converging portion 243 selects an arbitrary bead 242 as shown in FIG. 3B and connects the focal points of the beads 242 that are adjacently surrounded by the center, The beads can be arranged such that the connecting line is for example hexagonal. In this case, since the ratio of the external light blocking unit 245 in the optical member 240 is lower than that of the optical member 242 shown in FIG. 3A, the light transmittance of the optical member 240 can be increased.

In addition, the bead 242 of the light converging portion 243 is a virtual extension line (α) and the light transmission support 241 connecting the focus of each bead 242 belonging to the same column or the same row, as shown in Figure 3c One side of, for example, long side (β) may be arranged to form a predetermined angle except 0 or 180 °. For example, when the crossing angle between the imaginary extension line α and the long side β of the light transmitting portion is a bias angle θ, the bead 242 of the light converging portion 243 has a bias angle of about 5 degrees. To 80 °. In this case, the moiré phenomenon and the Newton ring can be prevented, which will be described later.

The diameter of the bead 242 may be variously modified according to the PDP device (100 in FIG. 1) to which the optical member 240 is applied, for example, the pitch of the partition wall included in the panel assembly (130 in FIG. 1). There may be a certain relationship, which will be described in the section on the PDP device (100 in FIG. 1).

In addition, the beads 242 are formed of a transparent material having a high light transmittance, for example, a light transmittance of 70% or more. For example, it may be formed of glass or transparent resin. At this time, the refractive index of the bead 242 may be in the range of 1.5 to 2.3, for example.

The external light blocking unit 245 is formed in a shape to fill the space between the light transmission support 241 and the light converging portion 243, so that each bead 242 of the light converging portion 243 to the light transmission support 241. Fixation, reduce the light reflectivity of the optical member 240, and the external ambient light 320 is introduced into the panel assembly (130 of FIG. 1) through a gap between the beads 242 of the light focusing portion 243 To prevent them.

The external light blocking unit 245 has a close relationship with the shape and arrangement of the beads 242 constituting the light focusing unit 243. Depending on the shape of the bead 242 of the light converging portion 243, for example, the radius of curvature of the bead 242, the degree to which the bead 242 is exposed by the external light blocking unit 245 is changed, thereby causing light The light aperture ratio of the bead 242 of the focusing portion 243 varies. At this time, the radius of curvature of the beads 242 may be adjusted so that the ratio of the light passing through each bead, that is, the light aperture ratio is in the range of 20 to 60%.

In addition, according to the arrangement of the beads 242, the external light blocking unit 245 has a predetermined pattern. For example, when the bias angle of the arrangement of the beads 242 is about 5 to 80 °, the moiré phenomenon and the Newton ring This will be described later.

The external light blocking unit 245 should have a sufficient degree of opacity to shield the external ambient light 320 to prevent the external ambient light 320 from entering the panel assembly 130 (FIG. 1). Accordingly, the external light blocking unit 245 may include a black inorganic material and / or an organic material, a metal, or the like that may absorb light.

The external light blocking unit 245 may include, for example, a mixture of a black pigment such as carbon black or a dry printing toner in a resin having thermoplasticity or ultraviolet curability. Examples of the resin included in the external light blocking unit 245 include, but are not limited to, aliphatic ester resins, acrylic resins, aromatic olefin resins, polyvinyl resins, aliphatic polyolefin resins, polycarbonates, and the like. For example, an acrylic resin having excellent mechanical strength and excellent transparency in the visible region may be used. Specific examples thereof include methyl methacrylate, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, and the like.

In addition, the external light blocking unit 245 may include, for example, a metal powder having high electrical conductivity. In this case, the external light blocking unit may also perform an electromagnetic shielding function because the electrical resistance may be adjusted according to the concentration of the metal powder. have.

Referring again to FIG. 2, the filter base 250 of the PDP filter (100 of FIG. 1) will be described. The filter base 250 may be formed by stacking the transparent substrate 251, the anti-reflection layer 253, or the electromagnetic shielding layer 255 in any order. In the present specification, a case where the filter base 250 is composed of separate layers corresponding to the electromagnetic shielding function and the anti-reflective function will be described by way of example, but is not limited thereto. The filter base 250 may include one or more layers. In one layer, it may have both an electromagnetic shielding function and an antireflection function, or may have any one of these functions.

The filter base 250 may have a structure in which an electromagnetic shielding layer 255 formed on one surface of the transparent substrate 251 and an antireflection layer 253 formed on the other surface of the transparent substrate 251 are stacked.

The transparent substrate 251 may be formed of, for example, a transparent inorganic compound molding such as glass or quartz or a transparent organic polymer molding such as acrylic, and may have a thickness of about 2.0 to 3.5 mm. Depending on the specification of the filter base 250, such a transparent substrate 251 may be excluded.

The anti-reflection layer 253 reduces the reflection of the external environmental light 320 of the PDP filter 140 to improve the visibility of the PDP device (100 of FIG. 1), as well as to display visible light 310 from the panel assembly (130 of FIG. 1). ) Transmittance and contrast ratio can be increased. The anti-reflection layer 253 may be formed on either side of the both sides of the transparent substrate 251, for example, the side facing the viewer when the PDP filter 140 is mounted on the PDP device (100 in FIG. 1). That is, formed on the transparent substrate 251 on the opposite side of the panel assembly (130 of FIG. 1) is more efficient in terms of improving visibility.

The electromagnetic shielding layer 255 is for shielding electromagnetic waves, and may be, for example, in the form of a conductive mesh or a conductive multilayer thin film. The electromagnetic shielding layer 255 in the form of a conductive mesh may be, for example, a metal coated on a grounded metal mesh or a mesh of synthetic resin or metal fiber. Examples of the metal material constituting the conductive mesh include electrical conductivity such as copper (Cu), chromium (Cr), nickel (Ni), silver (Ag), molybdenum (Mo), tungsten (W), and aluminum (Al). It will not specifically limit, if workability is a metal with priority. In addition, a blackened surface of the metal mesh may be used in order not to lose the external environmental light 320 blocking function of the optical member 240 disposed on the filter base 250.

In addition, the electromagnetic shielding layer 255 in the form of a conductive multilayer thin film is made of a metal such as gold (Au), silver (Ag), copper (Cu), platinum (At), palladium (Pd), or an alloy thereof. A metal thin film and high refractive index transparent thin films, such as indium oxide, a 2nd tin oxide, and zinc oxide, are laminated | stacked alternately. The high refractive index transparent thin film also has the effect of shielding near infrared rays.

Although not shown, the filter base 250 according to the exemplary embodiment of the present invention may separately include a near infrared shielding layer. The near-infrared shield layer serves to shield strong near-infrared rays generated from the panel assembly (130 of FIG. 1) causing malfunction of electronic devices such as a wireless telephone or a remote controller. The near infrared ray shielding layer includes a polymer resin containing a near infrared absorbing dye that absorbs the wavelength of the near infrared region. As the near-infrared absorbing dye, for example, dyes of various components such as cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium and nickel dithiol can be used.

The optical member 240 described above is formed on one surface of both surfaces of the filter base 250. For example, the light transmission support part 241 of the optical member 240 may be formed on the filter base 250 to be located toward the electromagnetic shielding layer 255 of the filter base 240, but is not limited thereto.

Although not shown, a transparent pressure-sensitive adhesive or an adhesive layer may be formed between each layer or film in the PDP filter 140 according to an embodiment of the present invention. The pressure-sensitive adhesive or adhesive layer may be formed, for example. Acrylic adhesives, silicone adhesives, urethane adhesives, polyvinyl butyral adhesives (PMB), ethylene-vinyl acetate adhesives (EVA), polyvinyl ethers, saturated amorphous polyesters, melamine resins, and the like.

The PDP filter according to the embodiment of the present invention as described above includes an external light blocking unit for preventing external environment light from entering the panel assembly and a light focusing unit for focusing visible light emitted from the panel assembly. In contrast, the contrast ratio in the bright room condition of the PDP device can be improved and the brightness can be improved. In addition, by arranging the beads of the light converging portion to have a predetermined bias angle, the moiré phenomenon and the Newton ring can be prevented.

Subsequently, a PDP filter according to another embodiment of the present invention will be described with reference to FIG. 4 based on differences from the PDP filter according to an embodiment of the present invention. 4 is a cross-sectional view of a PDP filter according to another embodiment of the present invention.

As shown in FIG. 4, the PDP filter 140 according to another embodiment of the present invention has a diffusion layer on the same filter base 250 and the optical member 240 as the PDP filter 140 according to the embodiment of the present invention. 260 is further included.

The diffusion layer 260 is for preventing a moiré phenomenon, a Newton's ring, or the like. The external light blocking part 245 formed between the light transmission support part 241 and the light converging part 243 of the optical member 240 is influenced by the arrangement of the beads to form a predetermined pattern. When the pattern of the pattern 245 and the mesh pattern of the electromagnetic shielding layer 255 in the form of a conductive mesh are reflected on the front substrate of the panel assembly 130 (in FIG. 1), the moiré is formed by mutual interference between the original pattern and the pattern by the reflected light. Symptoms may occur. In addition, when the separation distance between the PDP filter 140 and the front substrate of the panel assembly 130 of FIG. 1 coupled thereto may be non-uniform, newtoning may occur. The diffusion layer 260 diffuses the pattern by the reflected light so that interference between the original pattern and the pattern by the reflected light does not occur, thereby preventing the moiré phenomenon and the Newton ring.

Diffusion layer 260 includes a film having an anti-glare surface. Here, the antiglare treatment may form a fine concavo-convex structure on the surface of the film by using a method such as, for example, a rough surfacing treatment method by sandblasting or embossing and a method of blending transparent fine particles. It is a process to do it. Such transparent fine particles include, for example, inorganic fine particles including silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide and the like, and organic fine particles including cross-linked or uncrosslinked polymers. Likewise, transparent fine particles having an average particle diameter of 0.1 to 50 mu m can be used.

As shown in FIG. 4, the diffusion layer 260 is, for example, the surface that is opposite to the viewer when the PDP filter 140 is mounted to the PDP device (140 in FIG. 1), that is, the panel assembly (130 in FIG. 1). Although not limited thereto, it may be disposed at any position within the PDP filter 140 and may also be formed on the surface of the PDP filter 140 facing the viewer, that is, on the anti-reflection layer 250.

As described above, the PDP filter according to another embodiment of the present invention further includes a diffusion layer, so that in addition to the effects of the PDP filter according to the embodiment of the present invention, moiré phenomenon and newton ring generation can be prevented.

Subsequently, a PDP filter 140 according to an embodiment of the present invention and a PDP filter 140 according to another embodiment of the present invention will be described with reference to FIGS. 5A and 5B. The explanation focuses on the difference from. 5A and 5B are cross-sectional views of a PDP filter according to another embodiment of the present invention.

5A and 5B, the PDP filter 140 according to another embodiment of the present invention has the same filter base 250 and optical member as the PDP filter 140 according to the embodiment of the present invention. The color correction layer 270 is further included in the same filter base 250 as the PDP filter 140 or the optical member 240 and the diffusion layer 260 according to another embodiment of the present invention.

The color correction layer 270 changes color balance by reducing or adjusting the amount of red (R), green (G), and blue (B) of visible light 310 emitted from the panel assembly (130 of FIG. 1). Or correct it. The color correction layer 270 uses various pigments to increase the color reproduction range of the PDP device (100 of FIG. 1) and to improve the sharpness of the screen. As such a dye, a dye or a pigment can be used. Kinds of dyes include dyes having a neon light shielding function such as anthraquinone, cyanine, azo, stryl, phthalocyanine and methine, but the present invention is not limited thereto. Since the concentration of the dye is determined by the absorption wavelength of the dye, the absorption coefficient, and the transmission characteristics required by the display device, it is not limited to a specific value and is not used. In the conventional PDP device, red visible light generated from plasma in the panel assembly is orange. The PDP filter 140 according to the embodiments of the present invention is provided by the color correction layer 270 included in the PDP filter 140. Essentially, the amount of orange light emitted can be reduced.

As described above, the PDP filter according to another embodiment of the present invention further includes a color correction layer, so that the PDP filter according to one embodiment of the present invention or the effect of the PDP filter according to another embodiment of the present invention may be colored. You can increase the range of reproduction and improve the sharpness of the screen.

Hereinafter, a method of manufacturing the optical member included in the PDP filter according to the embodiments of the present invention will be described with reference to FIGS. 6 to 10C. 6 is a flowchart illustrating a method of manufacturing an optical member according to an exemplary embodiment of the present invention, and FIGS. 7 to 10C are perspective views of an intermediate structure during the manufacturing process of the optical member according to an exemplary embodiment of the present invention. .

Referring to Figure 6, first to provide a light transmission support (S1).

Specifically, as shown in FIG. 7, the light transmission support part 241 is a plate-like support made of a transparent material that transmits visible light, for example, polyethylene terephthalate (PET), polycarbonate PC), and polyvinyl chloride (PVC). ) And the like, but is not limited thereto. In this case, the thickness of the light transmission support part 241 may be, for example, 25 to 1000 μm.

Next, an opaque fluidized bed is formed on the light transmitting support (S2 of FIG. 6).

As shown in FIG. 8, a fluidized bed 244 having opacity sufficient to block light is formed on the light transmission support 241.

First, a black pigment such as carbon black or a dry printing toner and a thermoplastic or ultraviolet curable resin are mixed with a commercial organic solvent. The mixture is formed on the light transmission support part 241 in a thin film form having fluidity by using a method such as spin coating, roll coating, dipping or bar coating. do. At this time, the opaque fluidized bed 244 has a fluidity that maintains its original shape when no external force is applied.

As the solvent, for example, a commercially available organic solvent such as toluene, methyl ethyl ketone (MEK), ethyl acetate (EA), or the like can be used. As the resin, an aliphatic ester resin or an acrylic resin can be used. , Aromatic olefin resins, polyvinyl resins, aliphatic polyolefin resins, polycarbonates, and the like, but are not limited thereto. For example, an acrylic resin having excellent mechanical strength and excellent transparency in the visible region may be used. Specific examples include methyl methacrylate, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, and the like. Include. In addition, a metal powder having high electrical conductivity may be further added to the mixture.

Subsequently, beads are arranged on the opaque fluidized bed to form a light focusing part (S3 in FIG. 6).

As shown in FIGS. 9A-9C, beads 242 are arranged on opaque fluidized bed 244. At this time, the bead 242 may be formed of, for example, glass or resin of a transparent material having a light transmittance of 70% or more. The cross section of the beads 242 may have an ellipsoid, for example, where the radius of curvature may be adjusted such that each bead is exposed by an external light shield (245 in FIG. 2) to have a light aperture ratio in the range of 20 to 60%. . In addition, the diameter of the beads 242 may be selected and used in a variety of sizes depending on the PDP device (100 of FIG. 1) to which the PDP filter (140 of FIG. 1) is applied, the diameter of the beads 242 is an example. For example, it may have a relationship with the partition wall of the panel assembly 130 of FIG. 1, which will be described in the section of the PDP device 100 of FIG.

The arrangement of the beads 242 can be adjusted to the form most suitable for increasing light transmittance and external ambient light blocking efficiency. For example, if one bead 242 is selected as shown in FIG. 9A and the focal point of the beads 242 that are adjacently surrounded by the center is connected, the beads 242 such that the connecting line is rectangular, for example. ) Can be arranged. In addition, when the bead 242 is arranged as shown in FIG. 9B, if one bead 242 is selected and the focus of the bead 242 that is adjacently surrounded by the center is connected, the connection line is for example. Beads 242 can be arranged to be hexagonal. In addition, the arrangement of the beads 242 is any one side of the virtual extension line (α) and the light transmission support portion 241 connecting the focus of each bead 242 belonging to the same column or the same row, as shown in Figure 9c, For example, the long sides β may be arranged to have a predetermined angle except for 0 or 180 °. For example, the beads 242 of the light focusing portion (243 in FIG. 10C) may be arranged such that the bias angle θ is about 5 to 80 degrees. When the bead 242 is arranged as shown in FIG. 9C, it is possible to prevent moiré phenomenon and newton ring generation.

Next, the opaque fluidized layer in which the light focusing part is formed is cured to form an external light blocking part (S4 in FIG. 6).

As shown in Figs. 10A to 10C, ultraviolet rays are applied or heat is applied to an opaque fluidized bed (244 of Figs. 9A to 9C) in which the beads 242 of the light converging portion 243 are arranged. That is, when the resin contained in the opaque fluidized bed (244 in FIGS. 9A to 9C) is an ultraviolet curable resin, ultraviolet rays are irradiated, and in the case of a thermoplastic resin, heat is applied. At this time, pressure may also be applied. As the opaque fluidized layer (244 of FIGS. 9A to 9C) is cured by ultraviolet irradiation, heating, or pressurization, the beads 242 are fixed to the light transmission support 241, and the light focusing unit 243 and the light transmission support 241. ) Is formed in the form of filling the space between the) to reduce the light reflectivity of the PDP filter (140 of FIG. 1), and complete the external light blocking unit 245 for blocking the light flowing into the PDP device (100 of FIG. 1) from the outside Done.

Hereinafter, a PDP apparatus to which a PDP filter according to embodiments of the present invention is applied will be described with reference to FIGS. 11A and 11B. 11A is a perspective view illustrating a PDP device according to an embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along the line BB ′ of FIG. 11A. As shown in FIGS. 11A and 11B, the PDP apparatus 100 according to an embodiment of the present invention includes a PDP filter 140 and a panel assembly 130. The PDP filter is the same as mentioned above, and the panel assembly will be described in detail below.

As shown in FIG. 11A, a plurality of sustain electrodes 712 are arranged in a stripe shape on the surface of the front substrate 711. Bus electrodes 713 are formed on each sustain electrode 712 to reduce signal delay. The dielectric layer 714 is formed on the surface where the storage electrode 712 is disposed so as to cover the whole. A dielectric protective film 715 is formed on the surface of the dielectric layer 714. For example, in one embodiment of the present invention, the dielectric protective film 715 can be formed by covering the surface of the dielectric layer 714 with a thin film of MgO using a sputtering method or the like.

On the other hand, a plurality of address electrodes 722 are arranged in a stripe shape on a surface of the rear substrate 721 that faces the front substrate 711. The arrangement direction of the address electrode 722 is a direction intersecting with the storage electrode 712 when the front substrate 711 and the rear substrate 721 are disposed to face each other. The dielectric layer 723 is formed on the surface where the address electrode 722 is disposed so as to cover the whole. On the surface of the dielectric layer 723, a plurality of partition walls 724 protruding toward the front substrate 711 while being parallel to the address electrode 722 are provided. The partition wall 724 is disposed in an area between the neighboring address electrode 722 and the address electrode 722.

The phosphor layer 725 is disposed on the side surface of the groove portion formed of the neighboring partition wall 724, the partition wall 724, and the dielectric layer 723. In the phosphor layer 725, a red phosphor layer 725R, a green phosphor layer 725G, and a blue phosphor layer 725B are disposed in each of the groove portions partitioned by the partition wall 724. These phosphor layers 725 are layers formed of a phosphor particle group formed by using a thick film forming method such as a screen printing method, an inkjet method, or a photoresist film method. As the material of the phosphor layer 725, for example, (Y, Gd) BO ₃ : Eu may be used as the red phosphor, Zn ₂ SiO ₄ : Mn as the green phosphor, and BaMgAl ₁₀ O ₁₇ : Eu as the blue phosphor. .

When the front substrate 711 and the rear substrate 721 having such a structure are disposed to face each other, the discharge gas is filled in the discharge cell 726 formed of the groove portion and the dielectric protective film 715. That is, the discharge cell 726 is formed at each portion of the panel assembly 130 where the sustain electrode 712 and the address electrode 722 intersect between the front substrate 711 and the rear substrate 721. As the discharge gas, for example, a Ne-Xe-based gas, a He-Xe-based gas, or the like can be used.

The panel assembly 130 having the above structure basically has a light emission principle such as a fluorescent lamp, and ultraviolet rays emitted from the discharge gas in accordance with the discharge in the discharge cell 726 excite the phosphor layer 725 to emit visible light. Is converted.

However, phosphor materials having different conversion efficiency into different visible light are used for the phosphor layers 725R, 725G, and 725B of each color used for the panel assembly 130, respectively. Therefore, when displaying an image in the panel assembly 130, the color balance is adjusted by adjusting the luminance of each phosphor layer 725R, 725G, 725B generally. Specifically, on the basis of the phosphor layer of the color having the lowest luminance, the luminance of the other phosphor layer is reduced at a ratio designated for each color.

The driving of the panel assembly 130 is largely divided into driving for address discharge and driving for sustain discharge. The address discharge occurs between the address electrode 722 and one sustain electrode 712, where wall charge is formed. The sustain discharge is caused by the potential difference between the two sustain electrodes 712 positioned in the discharge cell 726 in which the wall charges are formed. During the sustain discharge, the phosphor layer 725 of the corresponding discharge cell 726 is excited by the ultraviolet rays generated from the discharge gas, and visible light is emitted, and the visible light is emitted through the front substrate 711 to be recognized by the user. To form an image.

Hereinafter, the relationship between the panel assembly 130 and the PDP filter 140 will be described with reference to FIG. 11B. In this case, the PDP filter 140 will be described with reference to the PDP filter (140 of FIG. 4) according to another embodiment of the present invention, but is not limited thereto.

The PDP filter 140 is disposed on the front substrate 711 of the panel assembly 130. In this case, as illustrated in FIG. 11B, the PDP filter 140 may be spaced apart from the front substrate 711 of the panel assembly 130, or alternatively, may be disposed in contact with each other. In addition, the front substrate 711 may be combined with an adhesive or an adhesive to prevent side effects such as foreign matters flowing between the panel assembly 130 and the PDP filter 140 or to reinforce the PDP filter 140 itself. have. In addition, when the PDP filter 140 is disposed in contact with the front substrate 711 of the panel assembly 130, the transparent substrate 251 of the filter base 250 may be omitted.

The PDP filter 140 focuses the visible light generated from the discharge cell of the external light blocking unit 245 and the panel assembly to prevent external environment light from entering the panel assembly 130 on the light transmission support part 241. It includes an optical member 240 including a portion (243). The external ambient light is absorbed by the external light blocking unit 245 to prevent the external environment light from being reflected back through the front substrate 711, thereby reducing the contrast ratio of the PDP device 100 in a bright room condition. Can be improved. In addition, the light concentrator 243 positioned on the side facing the panel assembly 130 focuses the visible light generated from the discharge cell 726 and emits the light to the outside of the PDP device 100, thereby preventing the external light blocking unit 245. It is possible to reduce the loss of light due to, and as a result, the brightness of the PDP apparatus 100 can be improved.

As shown in FIG. 11B, the bead 242 constituting the light converging portion 243 allows the boundary between the beads 242 to be disposed at a position corresponding to the partition wall 724 to more efficiently focus visible light. have. At this time, the pitch L2 of the partition wall 724 is preferably an integer multiple of the pitch L1 of the light converging portion 243. Therefore, it is preferable that one or two or more beads 242 correspond to the unit discharge cells 726 to focus visible light.

Although not shown, three or four beads 242 may be arranged with respect to the unit discharge cell 726. In the case where the partition walls 724 and the beads 242 are not regularly aligned, the manufacturing efficiency in the process may be improved. Can increase.

Subsequently, a PDP device according to another embodiment of the present invention will be described with reference to FIG. 12 based on differences from the PDP device according to an embodiment of the present invention. 12 is an exploded perspective view showing a PDP apparatus according to another embodiment of the present invention. For convenience of description, members having the same function as each member of the previous embodiment are denoted by the same reference numerals, and thus description thereof is omitted. As shown in FIG. 12, the PDP filter according to another embodiment of the present invention has a basically identical structure except for the following with the previous embodiment.

As shown in FIG. 12, the PDP filter 140 may antiglare the front substrate 711 of the panel assembly 130 instead of including the diffusion layer in order to prevent moiré phenomenon and Newton ring. In other words, the diffuse reflection surface 811 of the front substrate 711 opposite to the PDP filter 140 is an antiglare surface, which prevents the interference phenomenon by diffuse reflection to prevent the reflected light from the front substrate 711 from having a certain pattern. Therefore, the moiré phenomenon and the Newton ring phenomenon can be prevented. In addition, the PDP filter 140 including the diffusion layer described in the previous embodiment may also be applied to the PDP device 100 according to another embodiment of the present invention.

Subsequently, a PDP device according to another embodiment of the present invention will be described with reference to FIG. 13 based on differences from the PDP device according to an embodiment of the present invention. 13 is an exploded perspective view showing a PDP apparatus according to another embodiment of the present invention. For convenience of description, members having the same function as each member of the previous embodiment are denoted by the same reference numerals, and thus description thereof is omitted.

In the above-described embodiments, the optical member 240 has been described as a component of the PDP filter 140 together with the filter base 250, but the present invention is not limited thereto. The PDP device 100 may be formed by directly forming or attaching the front substrate 711 of the panel assembly 130 and placing the filter base 250 on the optical member 240. That is, as shown in FIG. 13, the optical member 240 may be directly formed or attached to the front substrate 711 of the panel assembly 130. The PDP filter 140 ′ may be spaced apart from or in contact with the optical member 240 formed on the front substrate 711, and may be disposed between the panel assembly 130 and the PDP filter 140 ′. The optical member 240 may be combined with an adhesive or an adhesive to prevent side effects such as foreign matter from entering or to reinforce the strength of the PDP filter 140 ′. In the PDP apparatus 100 having such a structure, the same effects and effects can be obtained as in the previous embodiments.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, in the present invention, the contrast ratio of the display device may be improved by the optical member including the light focusing unit and the external light blocking unit. In addition, since the bead arrangement of the light converging portion is inclined at a predetermined bias angle or includes a diffusion layer, the moiré phenomenon and the like can be effectively prevented.

Claims (27)

Light transmission support; A light converging part formed on the light transmitting support part and including a plurality of beads having an elliptical cross section; And And an external light blocking unit formed to fill a space between the light transmitting support unit and the light concentrating unit. The method of claim 1, The bead is an optical member for a display device, the light transmittance is 70% or more glass or resin. The method of claim 1, The refractive index of the bead is 1.5 to 2.3 optical member for display device. The method of claim 1, And the bead is exposed by the external light blocking unit to have a light opening ratio of 20 to 60%. The method of claim 1, And the bead arrangement is biased at an angle of 5 ° to 80 ° with the long side of the light transmission support part. delete The method of claim 1, The external light blocking unit includes at least one of a black inorganic material, an organic material, and a metal. Filter base; And A light converging portion formed on one surface of the filter base, the light concentrating portion including a plurality of beads formed on the light transmitting support portion and having an elliptical cross section, and formed between the light transmitting support portion and the light concentrating portion; A filter for a display device comprising an optical member for a display device including an external light blocking unit formed while filling a space between the light concentrators. The method of claim 8, And said bead is a glass or resin light transmittance of 70% or more. The method of claim 8, The refractive index of the beads is 1.5 to 2.3 filter for a display device. The method of claim 8, And the bead is exposed by the external light blocking unit to have a light opening ratio of 20 to 60%. The method of claim 8, And the bead arrangement is biased at an angle of 5 ° to 80 ° with the long side of the light transmission support. delete The method of claim 8, The external light blocking unit is a filter for a display device including any one or more of black inorganic material, organic material and metal. The method of claim 8, And a diffusion layer on one surface of the filter for display device. The method of claim 15, And the diffusion layer comprises a film having an antiglare surface. A panel assembly including a transparent front substrate and a back substrate coupled to face each other and a plurality of cells between the front substrate and the back substrate; An optical member for a display apparatus according to any one of claims 1 to 7, which is directly attached to the front substrate of the panel assembly; And And a filter for display device disposed opposite to the optical member for display device and having a function of preventing an antireflection function or shielding electromagnetic waves, near infrared rays, or a combination thereof. A panel assembly including a transparent front substrate and a back substrate coupled to face each other and a plurality of cells between the front substrate and the back substrate; And A display device comprising a filter for a display device according to any one of claims 8 to 16 disposed opposite the front substrate of said panel assembly. The method of claim 18, And the front substrate has an antiglare surface. The method of claim 18, And the front substrate and the filter for the display device are bonded to each other with an adhesive or an adhesive. Preparing a light transmission support; Forming an opaque fluidized bed on one surface of the light transmitting support; Arranging a plurality of beads on the opaque fluidized bed to form a light concentrator; And Hardening the opaque fluidized layer to form an external light shielding portion having a shape that fills the light concentrating portion and the light transmitting support portion. The method of claim 21, The said bead is a manufacturing method of the optical member for display apparatuses whose light transmittance is 70% or more of glass or resin. The method of claim 21, The refractive index of the said bead is a manufacturing method of the optical member for display devices. The method of claim 21, The bead is exposed by the external light blocking unit having a light opening ratio of 20 to 60% of the manufacturing method of the optical member for a display device. The method of claim 21, And the bead arrangement is biased at an angle of 5 ° to 80 ° with the long side of the light transmitting support. delete The method of claim 21, The external light blocking unit is a manufacturing method of an optical member for a display device including any one or more of black inorganic material, organic material and metal.

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