KR20090011760A - Optical member for display apparatus - Google Patents

Abstract

An optical member for display device is provided to increase a shielding effect to external light and to enhance a transmittance to a display light source by forming an optical trap for absorbing and reflecting light thereon. An optical member(200) for display device includes a base material(220) and an external light shielding part(240). The external light shielding part includes a light-absorbing layer(242), The base material is made of a transparent resin and includes a plurality of wedge-shaped grooves formed at one side thereof. The light-absorbing layer is formed along an inner wall of the wedge-shaped grooves. The external light shielding part includes a light-reflecting layer(244) formed on the light-absorbing layer.

Description

Optical member for display apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member for a display device, and more particularly, to prevent a decrease in contrast ratio and luminance due to interference of external light in bright room conditions, and to effectively transmit light emitted from a display. It relates to an optical member for a display device that can be made.

As the modern society is highly informationized, image display-related parts and devices have been remarkably advanced and disseminated. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses of personal computers, and the like, and thinning is progressing at the same time as these displays are enlarged.

In general, a plasma display panel (PDP) device is in the spotlight as a next-generation display device because it can satisfy both an enlargement and a thinning at the same time as a cathode ray tube (CRT) representing a conventional display device. The PDP apparatus displays an image using a gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like. In addition, PDP devices are easier to be enlarged than other display devices, and are considered to be thin display devices having the most suitable characteristics as high quality digital televisions in the future.

The PDP device generates a discharge in the gas between the electrodes by a direct current or an alternating current voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet rays, which emits light.

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 of the PDP device due to the orange light emitted from the encapsulated helium (He) or xenon (Xe), which does not reach the cathode ray tube. There is this.

Therefore, electromagnetic waves and near-infrared rays generated in the PDP device may adversely affect the human body and cause malfunction of precision devices such as a wireless telephone or a remote controller. In order to use such a PDP apparatus, it is required to suppress 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, and to reduce reflected light and improve 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.

Such a PDP filter is manufactured by stacking several functional films such as an electromagnetic shielding layer, a near infrared shielding layer, and a neon light shielding layer by an adhesive or an adhesive. Among these, an external light shielding layer for shielding external ambient light and absorbing external light reflected by the panel is used to increase contrast ratio and brightness of a display.

The conventional external light shielding layer is composed of an external light shielding pattern and a transparent substrate portion filled with a black material having a function of absorbing external light, and when the cross-section of the external light shielding pattern is wedge-shaped, the bottom surface is typically It is arranged in the direction facing the panel. The external light blocking efficiency may be increased in proportion to the area of the bottom surface of the external light shielding pattern, but the incident light from the display is also blocked, so that the luminous efficiency of the display is inversely proportional to the area of the bottom surface. After the light is reflected by the panel and is emitted to the display screen along with the incident light of the panel for displaying the image, the contrast ratio and the image quality of the display are deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical member for reflecting and absorbing light in an optical member, thereby providing an optical member for a display device with high external light shielding efficiency and high transmittance to a display light source. .

An object of the present invention is to provide an optical member for a display device which is excellent in contrast ratio in bright room conditions.

Technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

An optical member for a display device according to an aspect of the present invention includes a transparent resin substrate having a plurality of wedge-shaped grooves formed on one surface thereof, a light absorbing layer formed along an inner wall of the wedge-shaped groove, and light formed on the light absorbing layer. An external light shielding part including a reflective layer is provided. That is, the optical member is formed of a transparent resin substrate and a plurality of external light shielding portions, and a plurality of wedge-shaped grooves are formed on one surface of the substrate. The external light shielding portion is formed along the inner wall of each wedge-shaped groove and consists of a light absorbing layer and a light reflecting layer having a predetermined thickness. The shape of the wedge-shaped groove is not limited to the wedge-shaped, it can be varied in trapezoidal, U-shaped, semi-circular, and the like.

The optical member for a display device according to another aspect of the present invention is characterized in that the light absorbing layer is formed of carbon black.

According to another aspect of the present invention, an optical member for a display device includes at least one material selected from the group consisting of silver, cobalt, copper oxide powder, and silver-carbon paste, wherein the light reflection layer includes a gloss material such as metal. It is characterized by including.

The optical member for a display device according to another aspect of the present invention is characterized in that the light reflecting layer is formed by polishing the surface of the light absorbing layer.

In the optical member for a display device according to another aspect of the present invention, the thickness of the light absorbing layer is 10 to 40% compared to the width of the wedge-shaped groove, and the thickness of the light reflecting layer is compared with the thickness of the light absorbing layer. It may be characterized in that 1 to 30%.

In the optical member for a display device according to another aspect of the present invention, the refractive index of the external light shielding portion may be lower than the refractive index of the substrate. The refractive index of the external light shielding part may be lower in the range of 0.01 to 0.5 than the refractive index of the substrate.

In the optical member for a display device according to another aspect of the present invention, the substrate may be characterized in that it comprises at least one pigment that selectively absorbs light. The dye may be a color correction dye, a dye having a near infrared ray shielding function, or a dye having a neon cut function depending on the absorption wavelength. The pigment may include at least one of cyanine-based, anthraquinone-based, naphthoquinone-based, phthalocyanine-based, naphthalocyanine-based, dimonium-based, nickel dithiol-based, azo-based, stryl-based, phthalocyanine-based and methine-based dyes.

In the optical member for a display device according to another feature of the present invention, the plurality of wedge-shaped grooves may have a stripe shape when viewed in plan view. Alternatively, when the wedge-shaped grooves are conical and the plurality of wedge-shaped grooves are viewed on a plane, the wedge-shaped grooves may have a rectangular shape or a hexagonal shape.

The optical member for a display device used in the present invention is a plasma display panel (PDP) device, an organic light emitting diode (OLED) device, a liquid crystal display (LCD) device, or an FED that implements RGB with pixels of a grid pattern. (Field Emission Display) It can be applied to various devices. When the optical member of the present invention is used as part of a PDP filter used in a PDP apparatus, the optical member is attached to the front panel of the PDP and various functional films such as an electromagnetic shielding film, a color correction film, a near infrared shielding film, an antireflection film, and the like. It may further include them.

The optical member for display device according to the present invention not only absorbs and blocks external light, but also absorbs the external light reflected by the display panel while being reflected by the light reflecting unit, so that the contrast ratio in the bright room is excellent.

Moreover, according to the optical member for display apparatuses of this invention, since the external light shielding efficiency is high, the transmittance | permeability with respect to incident light from a display panel is high, and it is excellent in visibility.

Hereinafter, an optical member for a display apparatus according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a filter for a display device including an optical member according to an embodiment of the present invention.

Referring to FIG. 1, the display apparatus filter 100 may include functional optical members having various shielding functions on the transparent substrate 110, and the functional optical members may include an electromagnetic shielding layer 120, an optical member 130, And a color correction layer 140 and an antireflection layer 150.

Based on the transparent substrate 110, the electromagnetic shielding layer 120, the optical member 130, and the color correction layer 140 are disposed in the direction toward the panel assembly, and the other surface of the substrate, that is, the external environment. The antireflection layer 150 is disposed in the direction in which the light 190 is incident.

The present invention is not limited thereto, and the transparent substrate 110, the electromagnetic shielding layer 120, the optical member 130, the color correction layer 140, and the anti-reflection layer 150 may be stacked in any order. The optical member of may perform a combination of two or more functions.

Examples of the material of the transparent substrate 110 may include an inorganic compound molding such as glass and quartz and a transparent organic polymer molding. Acrylic or polycarbonate is generally used as the transparent substrate 110 formed of the organic polymer molding, but the present invention is not limited to these embodiments. The transparent substrate 110 preferably has high transparency and heat resistance, and a polymer molded product and a laminate of the polymer molded product may be used as the transparent substrate 110. As for the transparency of the transparent substrate 110, it is advantageous that the visible light transmittance is 80% or more, and in terms of heat resistance, the glass transition temperature is preferably 50 ° C or more. The polymer molded article may be transparent in the visible wavelength range, and polyethylene terephthalate (PET) is preferable in terms of cost, heat resistance, and transparency, but is not limited thereto. In addition, in some cases, the transparent substrate 110 may be excluded from the configuration of the filter.

The anti-reflection layer 150 prevents the external environment light 190 incident from the viewer's direction to be reflected back to the outside, thereby improving the contrast ratio of the display. In the present embodiment, the anti-reflection layer 150 is formed on the other surface of the transparent substrate 110, but the present invention is not limited to this stacking order. Preferably, as shown in FIG. 1, the anti-reflection layer 150 may be formed on the surface facing the viewer when the filter 100 for the display device is mounted on the display device, that is, the surface opposite to the panel assembly side. to be.

The electromagnetic shielding layer 120 serves to block electromagnetic waves generated from the panel assembly. In order to shield the electromagnetic waves, it is necessary to cover the display surface with an object having high conductivity. As the electromagnetic shielding layer 120 for shielding electromagnetic waves according to an embodiment of the present invention, a multilayer transparent conductive film in which a conductive mesh film or a metal thin film and a high refractive index transparent thin film is laminated may be used. As the conductive mesh film, generally, a metal mesh ground or a metal coating on a mesh of synthetic resin or metal fiber can be used. As a material of the metal which comprises a conductive mesh film, if the metal which is excellent in electroconductivity and workability, such as copper, chromium, nickel, silver, molybdenum, aluminum, can be used, for example.

In addition, the multilayer transparent conductive film may be a high refractive transparent thin film represented by indium tin oxide (ITO) to shield the electromagnetic waves. Examples of the multilayer transparent conductive film include a multilayer thin film in which metal thin films such as gold, silver, copper, platinum, and palladium are alternately stacked with high refractive index transparent thin films such as indium oxide, ditin oxide, and zinc oxide.

Although not shown, the display apparatus filter 100 according to an embodiment of the present invention may separately include a near infrared shielding layer. The near-infrared shielding layer serves to shield strong near-infrared rays generated from the panel assembly causing malfunction of electronic devices such as wireless telephones and remote controls.

In the exemplary embodiment of the present invention, when a multilayer transparent conductive film in which a metal thin film and a high refractive index transparent thin film are stacked as the electromagnetic shielding layer 120 is provided, the multilayer transparent conductive film shields near infrared rays. Therefore, in this case, two functions of shielding near infrared rays and electromagnetic waves may be performed using only the electromagnetic shielding layer 120 without separately forming the near infrared shielding layer. In this case, of course, the near-infrared shielding layer may be formed separately.

The display device filter 100 includes a color correction layer 140 that selectively absorbs light of a specific wavelength band. The color correction layer 140 is positioned on one surface of the optical member 130 in the direction of the panel assembly, but is not limited thereto. The color correction layer 140 changes or corrects the color balance by reducing or adjusting the amount of red (R), green (G), and blue (B) to increase the color reproduction range of the display and improve the sharpness. .

The color correction layer 140 includes various pigments, and such dyes may be used as dyes or pigments. Kinds of pigments include organic pigments 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 type and concentration of the dye are determined by the absorption wavelength, absorption coefficient, and transmission characteristics required in the display, the dye is not limited to a specific value and is not used.

In addition, although not shown, the filter for the display device 100 may include a diffusion layer. The diffusion layer prevents moiré or newtoning, which may be caused by interference between incident light and reflected light, when the periodic pattern of the optical member 130 or the electromagnetic shielding layer 120 is reflected on the front substrate of the panel assembly. Do it. The diffusion layer may be disposed at any position within the filter 100 for display device, but is preferably formed on one surface of the PDP filter 200 adjacent to the panel assembly. The diffusion layer may be included in the filter 100 for a display device as a separate layer, or may be included in combination with other optical members.

The optical member 130 absorbs external light to prevent external environment light 190 from entering the panel assembly, and totally reflects the panel incident light 180 emitted from the panel assembly toward the viewer. Thus, a high transmittance to visible light and a high contrast ratio can be obtained. In addition, the light reflected by the panel in the external light is absorbed by the external light shielding unit 134 to prevent the phenomenon that the image overlaps due to repeated light reflection.

In the present embodiment, the optical members corresponding to the electromagnetic shielding function, the anti-reflection function, and the color correction function are separately described as separate ones, but the present invention is not limited thereto, and a plurality of functions may be performed by one member. have.

The optical member 130 includes a transparent resin substrate 132 and an external light shielding pattern formed on one surface of the substrate 132 and composed of a plurality of external light shields 134. The external light shielding pattern may be formed in a shape of a wedge-shaped stripe, that is, a plurality of intaglio triangular pillar structures arranged in parallel with each other, but the present invention is not limited thereto, and the external light shielding pattern may be in the form of an embossed pattern. It may have a two-dimensional or three-dimensional shape in the form of intaglio. In addition, the external light shielding portion 134 may be a cone (cone) type, when viewed in plan view of the array of the cone-shaped external light shielding portion may be in the form of a square or hexagon.

The optical member 130 is disposed on an opposite surface of the anti-reflection layer 150 with respect to the transparent substrate 110. However, the present invention is not limited thereto, and as long as the optical member 130 is disposed so that absorption of the external environment light 190 and transmission of the panel incident light 180 occur well, the stacking order and the stacking direction between the optical members are It can be variously modified.

In the present embodiment, the external light shielding portion 134 has a wedge-shaped bottom surface of the external light shielding portion parallel to one surface of the substrate facing the panel assembly, but the present invention is not limited thereto. That is, the wedge-shaped bottom surface of the external light shielding portion 134 parallel to one surface of the substrate 132 may face the viewer, and the external light shielding portion 134 may be formed on both surfaces of the substrate 132. It may be.

The substrate 132 is a plate-like support made of a transparent material that transmits visible light, polyethylene terephthalate (PET), acrylic, polycarbonate (PC), urethane acrylate (Urethane Acrylate), It may be made of polyester, epoxy acrylate, brominated acrylate, polyvinyl chloride (PVC), and the like.

As a method of forming a plurality of wedge-shaped grooves on one surface of the substrate 132, a heat press method for pressing the heated mold to the thermoplastic resin, a casting method in which the thermoplastic resin composition is injected into the mold and solidified, an injection molding method, and an ultraviolet curing method The UV method etc. which inject | poured the resin composition in the shaping | molding die and ultraviolet-cured are conventionally well-known methods. Among the above methods, in order to protect the anti-reflection layer 150 already formed in the filter 100, it is preferable to form wedge-shaped grooves by using an ultraviolet curable resin on the opposite side to the side on which the anti-reflection layer 150 is formed.

Filling the base material 132 having the wedge-shaped grooves with a suitable amount of resin containing colored particles such as black pigment and carbon black, and using the mold having a smaller wedge-shaped protrusion than the wedge-shaped groove, the external light shielding portion 134 ), And then complete the pattern using a wiping method. The filling process may be performed a plurality of times when the light absorbing layer and the light reflecting layer in the external light shielding part 134 are formed of different kinds of materials. The light absorbing layer and the light reflecting layer will be described in detail later with reference to FIGS. 2 and 3.

The external light shielding part 134 mainly serves to absorb external environmental light 190 to increase the contrast ratio of the display, and may further include a conductive material according to the purpose.

The external light shielding part 134 may be formed of a material having a refractive index lower than that of the substrate 132. When the substrate 132 is a general ultraviolet curable resin, since the refractive index is about 1.56, the refractive index of the external light shielding part 134 may be about the same as the refractive index of the substrate 132 or lower in the range of about 0.01 to 0.5. . When the refractive index of the external light shielding portion 134 is lower than the refractive index of the substrate 132, the external light 190 incident into the filter 100 is at the boundary between the external light shielding portion 134 and the substrate 132. Can be totally reflected. Therefore, when the filter 100 is used as a PDP filter, the external light 190 passing through the filter 100 and incident into the PDP panel is totally reflected by the external light shielding part 134, and the transmitted external light absorbs light. By absorbing the material and shielding the external light, it is possible to increase the contrast ratio of the display.

Hereinafter, an optical member including external light shielding parts including a light absorbing layer and a light reflecting layer will be described.

FIG. 2 is a cross-sectional view illustrating an optical member according to an exemplary embodiment. FIG. 3 is a conceptual diagram illustrating a light absorption and a light reflection process in the optical member of FIG. 2.

2 and 3, the optical member 200 for a display device includes a transparent resin substrate 220 having a plurality of wedge-shaped grooves formed on one surface thereof and a light absorbing layer 242 formed along an inner wall of the wedge-shaped groove. ) And an external light shielding part 240 including a light reflecting layer 244 formed on the light absorbing layer 242.

The light absorbing layer 242 and the light reflecting layer 244 first fill a wedge-shaped groove with a mixture of a black material such as carbon black and a resin, and then fill a resin including a gloss material such as metal particles and protrude. It is formed using a mold having a wedge shape. That is, the light absorbing layer 242 formed of a black material including carbon black is formed in a wedge shape with a predetermined thickness along the inner wall of the wedge-shaped groove, and the light reflecting layer 244 is formed on the light absorbing layer 242. It is formed to have a predetermined thickness along the shape of (242). The light reflecting layer 244 may include at least one material selected from the group consisting of silver (Ag), cobalt, copper oxide powder, and silver-carbon paste, and the light reflecting layer 244 may partially reflect light. Will absorb. Accordingly, when the reflection occurs several times by the light reflecting layer 244, the light intensity gradually decreases, resulting in complete absorption. Alternatively, the light reflection layer 244 may be formed by polishing the surface of the light absorbing layer 242. By smoothly polishing the surface of the light absorbing layer 242 to increase the reflectance of the light, the light is partially reflected while some of the light is absorbed, so that the intensity of the light is gradually reduced during multiple reflections, thereby completely absorbing the light.

When the external light shielding part 240 is formed, the external light shielding part 240 is formed using a mold by filling an appropriate amount instead of completely filling the inside of the wedge-shaped groove, and then a predetermined space is empty. To be The optical member 200 is bonded to another functional member in a filter for a display device, and at this time, the empty space is filled with air. However, the present invention is not limited thereto, and after the external light shielding part 240 is formed, the transparent resin may be filled to completely fill the inside of the wedge-shaped groove.

Referring to FIG. 3, when external ambient light 350, 380, 390 is incident on a display and is directly absorbed by the light absorbing layer 342 (380), absorption after reflection by the light reflecting layer 344 is applied. There is a case 390 or a case 360 that is not absorbed and reflected by the panel 400. The panel reflected light 360 may be absorbed again by the external light shielding part 340, but in most cases, the panel reflected light 360 is emitted to the display screen along with the incident light of the panel, thereby decreasing the contrast ratio. Accordingly, the optical member of the present invention includes the light reflecting layer 344 and the light absorbing layer 342 in the external light shielding portion 340 as described above, and the panel reflected light 360 is reflected by the light reflecting layer 344 a plurality of times. As it grows, its strength decreases, eventually becoming fully absorbed.

On the other hand, it is preferable to optimize the transmittance of the incident light of the panel and the absorption of external ambient light by adjusting the distance between the external light shielding parts 240. When the light absorbing material is filled in the outer light shielding part as in the conventional case, the panel incident light is absorbed by the area of the width H ₁ of the wedge-shaped groove. Even in this embodiment, the absorption of the incident light on the panel is determined by the width H ₁ of the wedge-shaped groove, but the external ambient light 350 is reflected by the panel by the light reflection layer 344 and the light absorption layer 342. By efficiently absorbing the reflected panel reflected light 360, the contrast ratio of the display can be increased.

Thickness (H ₂₎ is from 10 to 40% in case of the width (H ₁₎ of the wedge-shaped groove, the thickness (H ₃₎ of the light-reflective layer of the light absorbing layer is compared to the thickness (H ₂₎ of said light absorbing layer 1 to 30%. If the thickness H ₂ of the light absorbing layer is less than 5% of H ₁ , the external light absorption efficiency is lowered. If the thickness H ₂ is greater than 40%, the light reflection part 244 is difficult to form. In addition, when the thickness H ₃ of the light reflection layer is greater than 30% of H ₂ , the efficiency of absorbing some of the incident light is very low.

Specifically, for example, when the width (H ₁ ) of the wedge-shaped groove is 30 to 40㎛, the thickness of the light absorbing layer may be 3 to 10㎛.

Hereinafter, an optical member for a display apparatus according to the present invention will be described in more detail with reference to the following examples, but the following examples are provided to illustrate the present invention in more detail, and the contents of the present invention are limited to the following examples. It is not.

Example 1

On one side of the optical polyethylene terephthalate (PET), a urethane acrylic UV resin having a solid-state refractive index of 1.56 was coated with a microvia to a thickness of about 200 μm, and then a wedge-shaped mold was used to form a pattern having a plurality of wedge-shaped grooves. The substrate was prepared by UV curing to form a wedge-shaped groove.

Next, black ink in which carbon black having an average particle diameter of 50 nm was dispersed at a 3% weight ratio was mixed with a UV cured resin to prepare a black resin having a refractive index of 1.56. The black resin is poured onto the substrate on which the wedge-shaped grooves are formed, and a small amount of cobalt and copper oxide powder, which is a glossy black material, is sprinkled on the black resin, and then the black resin and the gloss are formed only inside the wedge-shaped grooves using a wiping method. After filling the appropriate amount of the wedge-shaped mold using an external light absorbing portion of about 10㎛ thickness was formed in the wedge-shaped groove. The external light absorbing portion had a trapezoidal shape with a width of the bottom surface of 32 μm, an upper surface of 6 μm, and an interval between adjacent external light absorbing portions of 107.5 μm.

Example 2

The same method as in Example 1 was used except that a light reflective layer of about 3 μm was formed using silver (Ag) -carbon paste as a glossy material.

Comparative Example 1

After preparing a substrate having a wedge-shaped groove in the same manner as in Example 1, a black resin obtained by mixing a black ink in which carbon black having an average particle diameter of 50 nm was dispersed at a weight ratio of 3% to a UV curable resin was formed in the wedge-shaped substrate. The external light absorbing portion was formed by filling the entire groove.

Table 1 shows the results of measuring the external light reflectance, bright room contrast ratio, and transmittance after attaching the optical members prepared in Examples 1, 2, and Comparative Example 1 to the PDP module (for SDIV4 module) at 120 lux conditions, respectively. to be.

Example 1 Example 2 Comparative Example 1 External light reflectance (cd / m ² ) 1.7 2.1 2.5 Brightness Contrast Ratio 435: 1 364: 1 288: 1 Transmittance (%) 72 74 70

According to the above Table 1, Examples 1 and 2 in which the light reflecting layer and the light absorbing layer are formed in the external light absorbing part have a level of transmittance equal to or higher than that of Comparative Example 1 in which the external light absorbing part is filled only with the light absorbing material. In addition, the display quality characteristics can be improved by lowering the black nit and increasing the contrast ratio.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a cross-sectional view showing a filter for a display device including an optical member according to an embodiment of the present invention.

2 is a cross-sectional view showing an optical member for a display apparatus according to an embodiment of the present invention.

3 is a conceptual diagram illustrating a light absorption and a light reflection process in the optical member of FIG. 2.

[Description of Major Symbols in Drawing]

100: filter for display device

110: transparent substrate 120: electromagnetic shielding layer

130: optical member 132: base material

134: external light shield

140: color correction layer 150: reflective ring layer

180: panel incident light 190: external ambient light

200: optical member for display device

220, 320: base material 240, 340: external light shielding part

242, 342: light absorbing layer 244, 344: light reflecting layer

350, 380, 390: External ambient light 360: Panel reflected light

370: internal reflection light 400: PDP panel

Claims (5)

A substrate made of a transparent resin material having a plurality of wedge-shaped grooves formed on one surface thereof; And And an external light shielding part including a light absorbing layer formed along an inner wall of the wedge-shaped groove and a light reflecting layer formed on the light absorbing layer. The method of claim 1, And the light absorbing layer comprises carbon black. The method of claim 1, And the light reflecting layer includes at least one material selected from the group consisting of silver, cobalt, copper oxide powder, and silver-carbon paste. The method of claim 1, And the light reflecting layer is formed by polishing a surface of the light absorbing layer. The method of claim 1, The thickness of the light absorbing layer is 10 to 40% compared to the width of the wedge-shaped groove, the thickness of the light reflecting layer is 1 to 30% compared to the thickness of the light absorbing layer, the optical member for display device.

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