KR100870290B1 - Visibility enhancement film, display filter and display apparatus using the same - Google Patents

Abstract

The present invention relates to a visibility enhancing film, a display filter and a display device using the same. The visibility enhancing film of the present invention includes a light blocking pattern layer facing the viewer side and having an external light shielding portion, and a light refractive layer formed to face the image light source side by interviewing the light blocking pattern layer, wherein the refractive index of the light blocking pattern layer ( N _x ) has a value greater than or equal to the refractive index N _y of the external light shielding portion, and the refractive index N _x of the light shielding pattern layer has a value greater than or equal to the refractive index N _z of the light refractive layer, that is, N _x ≧ N _y And satisfying the condition that N _x ≥ N _z . According to the present invention, as compared with the conventional visibility enhancing film, the image light source can be more effectively transmitted, and the image and the reflected light by the external environmental light can be effectively shielded, so that the luminance and the viewing angle can be more efficiently expanded, and the contrast can be increased on the spot. There are advantages to it.

Visibility Enhancement Films, Black Stripes, Lenses, Refractive Index, Display Filters, Display Devices

Description

Visibility enhancement film, display filter and display apparatus using the same}

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 and 2 are cross-sectional views showing a visibility improving film according to an embodiment of the present invention.

3 is a cross-sectional view illustrating a display filter according to an embodiment of the present invention.

4 is an exploded perspective view showing a display device according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

DESCRIPTION OF SYMBOLS 10: Visibility improvement film 11: Transparent base material 12: Light-shielding pattern layer

13: light refractive layer 14: protective film 15: external light shielding

15a: Bottom surface of external light shielding portion 15b: Inclined surface of external light shielding portion

16: lens 20: antireflection film 30: transparent glass substrate

40: electromagnetic wave shielding film 50: color correction film 100: display filter

110: case 120: driving circuit board

130: panel assembly 140: cover 1000: display device

The present invention relates to a visibility enhancing film, a display filter and a display device using the same, and more particularly, to form a light shielding pattern layer having an external light shielding portion and a light refractive layer provided with a lens or refractive layer on the light shielding pattern layer. The refractive index N _x of the light shielding pattern layer has a value greater than or equal to the refractive index N _y of the external light shielding portion, and the refractive index N _x of the light shielding pattern layer has a value greater than or equal to the refractive index N _z of the light refractive layer. so as to have, that is, than a N ≥N _{x y, x} N ≥N by by adjusting so as to satisfy the condition of _z at the same time to more effectively transmit the image ores compared to the conventional visibility improving film effectively shield the image and the reflected light by the external light Visibility Enhancement Film and Display Fill Using the Same to Easily Increase Brightness and Viewing Angle and Enable Contrast on Spots And a display device.

In a projection screen and a flat panel display (liquid crystal display device, plasma display device, organic light emitting display) and the like, viewer visibility is generally important to ensure that a good image can be obtained from any position.

In the projection screen device, in order to increase the visibility of the viewer, the surface of the transmissive sheet is roughened, light diffusing fine particles are contained in the resin film, or a lenticular lens sheet in which a cylindrical lens is arranged in parallel on one plane. Although these technologies are known, image light is diffusely reflected along the surface of a film having light diffusing fine particles or irregularities, and a lot of stray light is generated, resulting in problems such as deterioration of brightness and contrast of a display surface.

In addition, Japanese Laid-Open Patent Publication No. 58-47681, Japanese Laid-Open Patent Publication No. Hei 6-504627, Japanese Laid-Open Patent Publication No. 1997-311206, and Japanese Laid-Open Patent Publication No. 2004-062084 are referred to as louver as a visibility improving sheet. BACKGROUND ART A technique for improving visibility is known, in which a light absorbing layer sheet is provided on a front surface of a display to prevent performance deterioration due to contrast degradation or lightness caused by external ambient light, to diffuse the effective display light, and to control the viewing angle. However, since these conventional techniques simply cut the image light in the oblique direction, the light reaching the viewer side in the high-precision display reduces the diffused light of the image, thereby narrowing the viewing angle and reducing the luminance. I have a problem.

Meanwhile, U.S. Patent 4,469,402, U.S. Patent 4,573,764, U.S. Patent 4,936,652, U.S. Patent 4,993,806, U.S. Patent 6,822,792 B2, JP-A-1987-108232, JP-A-1988- 037337, Japanese Patent Laid-Open No. 2000-352608, Japanese Patent Laid-Open No. 2003-050307, Japanese Patent Laid-Open No. 2003-0547416, Japanese Patent Laid-Open No. 2004-151592, Japanese Patent Laid-Open No. 2005-114953 Another conventional technique disclosed in Japanese Patent Application Laid-Open No. 2006-106393 and the like relates to a light diffusion sheet having a wedge-shaped external light absorbing layer on an image light source side. These conventional techniques fill an external light absorbing layer with a material having a lower refractive index than a light diffusing layer and a light absorbing material to effectively block external environmental light incident in an oblique direction, and more effectively diffuse an image light source using a total reflection principle to reduce contrast. It is about reducing. According to the conventional light diffusion sheet technology, since a light source such as a projection screen is parallel light, an external light shielding layer of black stripe type is formed in order to effectively transmit light of parallel light and to block light by external ambient light relatively high. It is formed as high as 70% of the total area. As a result, various problems such as low transmittance, double image generation, and narrow viewing angle are generated in diffused image source light of flat panel displays where contrast is improved but visibility is important.

Recently, transmittance and contrast enhancement sheets for image light on a flat panel display have been developed on a spot, and Japanese Patent Application Laid-Open No. 2004-295045, Japanese Laid-Open Patent Publication No. 2005-084477, Japan It is disclosed in Japanese Patent Laid-Open No. 2006-145611, Korean Laid-Open Patent No. 2006-80116, and Korean Patent No. 59713. The above techniques have the advantage of reducing the shape and area ratio of the blast-life type external light shielding layer to improve the transmittance while appropriately blocking the image by external environmental light to enable contrast enhancement. There is a problem in that the luminance is reduced or the viewing angle is narrowed by the ratio of the external light shielding layer that is partially absorbed.

Accordingly, efforts to recognize and solve the problems of the prior art related to the light diffusion sheet or the external light shielding layer described above have been continued in the related art, and the present invention has been made under such a technical background.

The technical problem to be solved by the present invention is to effectively transmit the image source light as compared to the conventional visibility enhancement film, and to effectively block the image and the reflected light by the external environment light, thereby increasing the luminance and viewing angle more efficiently, and contrast on the spot An object of the present invention is to provide an increase in visibility visibility film and a display filter and a display device using the same, which enables to increase the number of technical problems.

Visibility improvement film for achieving the technical problem to be achieved by the present invention, the light shielding pattern layer facing the viewer side and having an external light shielding portion; And a light refractive layer formed to face the image light source side in contact with the light shielding pattern layer, wherein the refractive index N _x of the light shielding pattern layer has a value greater than or equal to the refractive index N _y of the external light shielding portion. The refractive index N _x of the light shielding pattern layer is characterized by satisfying a condition having a value greater than or equal to the refractive index N _z of the light refractive layer, that is, N _x ≥ N _y and N _x ≥ N _z .

Display filter for achieving the technical problem to be achieved by the present invention is characterized in that it is provided including at least one of the visibility improving film.

According to an aspect of the present invention, there is provided a display apparatus including: a panel assembly 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 the display filter disposed to face the front substrate of the panel assembly.

In addition, the visibility enhancing film of the present invention may be laminated on the transparent surface of the light-shielding pattern layer to the viewer opposing surface arbitrarily imparted antistatic, anti-scratch, anti-reflection function, the protective film is provided on the image source facing surface of the light refractive layer Can be attached.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

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 of ordinary skill in the art. Could be used. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly.

The visibility enhancing film of the present invention includes a large display device such as a plasma display panel (PDP) device, an organic light emitting diode (OLED) device, a liquid crystal display (LCD) device, or a field emission display (FED) device; Small mobile display devices such as personal digital assistants (PDAs), small game machine display windows, and mobile phone display windows; The present invention may be variously applied to a flexible display device. In particular, the present invention can be effectively applied to an outdoor display device having strong external environmental light and a display device installed indoors of a public facility. Hereinafter, for convenience of description, the present invention will be described using a PDP device that implements RGB with pixels of a grid pattern and a PDP filter used therein, but the present invention is not limited thereto, and the aforementioned various display devices are described. And a filter for a display device used therein.

The present inventors have endeavored to economically manufacture a film that enables more efficient visibility improvement on a sight. As a result, a light shielding pattern layer having an external light shielding part is formed on a transparent substrate, and a lens is arbitrarily provided on the light shielding pattern layer. As a result of the formation of the layered light refraction layer, it was confirmed that the contrast on the spot can be improved by transmitting the image source light more effectively than the conventional visibility enhancing film and effectively shielding the image by the external environment light. On the basis of this, the present invention has been completed.

Visibility improvement film of the present invention is opposed to the viewer side and the light shielding pattern layer having an external light shielding portion; And a light refractive layer formed to face the image light source side in contact with the light shielding pattern layer, wherein the refractive index N _x of the light shielding pattern layer has a value greater than or equal to the refractive index N _y of the external light shielding portion. It is preferable that the refractive index N _x of the light shielding pattern layer satisfies a condition having a value equal to or higher than the refractive index N _z of the light refractive layer.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4.

1 and 2 are cross-sectional view showing a visibility improving film according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the structure of the visibility enhancing film 10 according to the embodiment of the present invention is formed on the viewer side transparent substrate 11 and the viewer side transparent substrate 11, The light shielding pattern layer 12 having the external light shielding portion 15, the light refractive layer 13 formed on the light shielding pattern layer 12, and optionally having a lens 16 or a refractive layer stacked thereon, and the light refractive index. It consists of a protective film 14 formed on the layer (13).

The viewer-side transparent base material 11 and a transparent resin film having visible light transmittance are preferable. As the material of the viewer-side transparent substrate 11, polyethylene terephthalate, polycarbonate, polyvinyl chloride, triacetyl cellulose, or the like may be used. In addition, a film having a unique function of a filter, for example, a color correction film layer or an electromagnetic wave shielding layer, may be used as the viewer-side transparent substrate 11 and the image light source side protective film 14.

The light shielding pattern layer 12 is formed on the viewer-side transparent substrate 11 and has a plurality of external light shielding portions 15 formed at predetermined intervals on one surface in contact with the viewer-side transparent substrate 11. The refractive index N _x of the light blocking pattern layer 12 is formed of a transparent material that satisfies a relationship having a value equal to or higher than the refractive index N _z of the light refractive layer 13, and one surface of the light blocking pattern layer 12 is formed. The external light shielding portion 15 formed at the upper portion is filled with a transparent low refractive index material having a refractive index N _y of a value less than or equal to the refractive index N _x of the light shielding pattern layer 12 and a material to which a light absorbing material is added. . The light shielding pattern layer 12 may be made of a light transmissive resin, and for example, an acrylate resin cured by ionizing radiation or thermal energy may be used.

The external light shielding portion 15 has a wedge shape in cross section and is formed in parallel on one surface of a substrate facing the panel assembly to prevent external environment light from entering the panel assembly. The external light shielding portion 15 includes a bottom surface 15a in contact with the light refraction layer 13 and an inclined surface 15b grooved in the light shielding pattern layer 12 from the bottom surface 15a. It absorbs external environmental light L5 and L6 or totally reflects light L1, L2, L3, and L4 incident from the panel assembly toward the viewer. At this time, the length ratio of the bottom surface 15a and the inclined surface 15b of the external light shielding portion 15 can be appropriately adjusted as necessary, and it is usually visible that the length of the inclined surface 15b is longer than the bottom surface 15a. It can have a high transmittance and a high contrast ratio for. In addition, the shape of the external light shielding portion 15 formed by the inclined surface 15b grooved in the light shielding pattern layer 12 from the bottom surface 15a is wedge-shaped, trapezoidal, cylindrical, rectangular, rhombic, etc. as necessary. It is a matter of course that the shape can be appropriately selected.

The angle? Formed by the normal of the surface (image light source surface) on which light is incident from the panel assembly and the inclined surface 15b of the external light shielding portion 15 is preferably 0 to 20 °. Regarding the numerical range of the angle θ formed by the normal of the image light source surface and the inclined surface 15b of the external light shielding portion 15, if the lower limit is reached, the effect of improving the brightness of the front side of the viewer is not obtained. If the upper limit is exceeded, a double phase is generated on the screen, which is not preferable. On the other hand, it is more preferable when the angle θ formed by the normal of the image light source surface and the inclined surface 15b of the external light shielding portion 15 is formed as 3 to 15 °.

The external light shielding portion 15 is made of a light-transmitting resin and a light absorbing material, and these materials can absorb external environmental light (L5, L6), and if it can totally reflect the light incident from the panel assembly, its kind Is not limited. The light transmissive resin may be a resin constituting the light shielding pattern layer 12 or a low refractive acrylate resin in which silicon or fluorine having a low refractive index is introduced, and the light absorbing material may be light incident from external light. The type is not limited as long as it can absorb, and for example, a pigment such as carbon or a substance colored at a predetermined concentration in a predetermined dye, a black inorganic substance, a black organic substance, or a metal may be used.

The light absorbing material constituting the external light shielding portion 15 is preferably included in 2 to 20% of the total volume. With respect to the numerical range for the content of the light absorbing material included in the external light shielding portion 15, if it falls below the lower limit, sufficient light absorbing effect is not obtained, contrast is lowered, which is undesirable, and when the upper limit is exceeded. It is not preferable because it obstructs the transmission of light incident at a large angle near the upper portion of the outer light shielding portion 15 and the viewing angle is narrowed.

The external light shielding portion 15 may be formed on the light shielding pattern layer 12 by a heat press method using a thermoplastic resin, or in a light shielding pattern layer 12 in which a shape opposite to the external light shielding portion 15 is transferred. And a roll molding method for injection-molding ionizing radiation, a thermoplastic or thermosetting resin, and an injection molding method. When the ultraviolet curable resin constituting the light shielding pattern layer 12 has an antireflection function, an electromagnetic shielding function, a color control function, or a combination thereof, the visibility enhancement film 10 may additionally perform these functions. .

The light refraction layer 13 is formed on one surface of the light shielding pattern layer 12, and includes a plurality of lenses 16 formed at predetermined intervals on one surface in contact with the light shielding pattern layer 12 (see FIG. 1), It may be made of a refractive layer (see FIG. 2) without a lens 16. The light refraction layer 13 may be formed using the same material as the material for forming the light blocking pattern layer 12, and a material smaller than the refractive index of the light blocking pattern layer 12 in view of refractive index, for example, ionizing radiation. Or an acrylate resin which is cured by thermal energy.

The lenses 16 (refer to FIG. 1) formed on one surface of the light refraction layer 13 at predetermined intervals have an interval equal to or different from the bottom surface 15a of the external light shielding portion 15 formed on the light shielding pattern layer 12. It may be formed in a width and is preferably a concave lens. It is preferable that the concave lens is manufactured in an embossing shape or a trench shape that is open toward the image light source side. The lens 16 may be used in a state where the inside thereof is completely empty in a vacuum state, and may be used in a state of being filled with a material having a refractive index smaller than that of the light refractive layer 13 as necessary.

The length of the bottom surface 2R of the lens 16 is preferably formed to be 60 to 180% of the length X1 of the bottom surface 15a of the external light shielding portion 15, and preferably the length of the bottom surface of the external light shielding portion. It is formed in the same length as (X1). That is, when the length X1 of the bottom surface 15a of the external light shielding portion 15 is 33.5 μm, the length 2R of the bottom surface of the lens 16 is 20 μm ≦ 2R ≦ 60 μm. In addition, the height (H) of the lens 16 is preferably a size of 0.8 to 2.8 times the bottom length (R) of the bottom surface of the lens 16, preferably the same as the bottom length (2R) of the lens 16. It is formed in length. That is, when the length 2R of the bottom surface of the lens 16 is 34 μm, the height of the lens 16 is 34 μm. On the other hand, the photorefractive layer 13 may be formed of only a refractive layer that is not provided with a plurality of lenses 16 on one surface (see FIG. 2). The above-described light refractive layer 13 is preferably formed to have a thickness of 10 to 100 µm, and more preferably 10 to 60 µm in thickness.

In addition, the refractive index N _x of the light shielding pattern layer 12 is greater than or equal to the refractive index N _y of the external light shielding portion 15, and the refractive index N _x of the light shielding pattern layer 12 is the light. It is preferable to satisfy the condition that the refractive index N _z of the refractive layer 13 is greater than or equal to, that is, N _x ≧ N _y , and N _x ≧ N _z .

In particular, the first refractive index difference (N _x -N _y ) is more preferably 0.05 or less in order to obtain optical characteristics for increasing contrast of image light and preventing double phase. When the first refractive index difference (N _x -N _y ) is larger than 0.05, the critical angle (75.45 °) that the total reflection occurs is small, and because of this, the external environmental light is totally reflected from the inclined surface (15b) to enter the panel assembly, so the contrast is low It is not desirable to lose. That is, since the external environment light such as fluorescent lamps, sunlight, etc. are positioned above the display device, the external environment light is incident at a value substantially smaller than 90 ° with respect to the inclined surface 15b of the external light shield 15. On the other hand, the second refractive index difference (N _x -N _z ) is preferably 0.26 or less in order to change the light of the image light source absorbed on the external light shielding portion 15 to an appropriate angle to further improve the brightness and viewing angle. If the second refractive index difference (N _x -N _z ) is larger than 0.26, it is not preferable because a double image occurs on the screen on the viewer side.

Finally, the image light source side protective film 14 is formed on the light refractive layer 13.

Referring to the visibility improving film of the present invention as described above according to the optical path of the light from the image light source side to the viewer side as follows.

As shown in FIG. 1, L1 light, L2 light, L3 light and L4 light are image source light generated in a discharge cell in a panel assembly, and L5 light and L6 light are external light.

First, the L1 light is straight ahead, and the obliquely incident L2 light and L3 light are totally reflected on the inclined surface 15b of the outer light shielding portion 15 of the light shielding pattern layer 12 due to the difference in refractive index of the lens portion, and thus the vertical light or incident light. The L4 light that reaches the viewer side at a small angle and enters the external light shielding portion 15 is effectively emitted to the viewer side by changing the angle of the refraction direction by the lens 16 of the light refraction layer 13. On the other hand, L5 light, which is light coming from the outside, L5 light that reaches the lens of the external light incident from the viewer side is totally reflected by the lens and absorbed by the external light shielding portion 15, and the inclined surface of the external light shielding portion 15 The L6 light incident on the light shielding portion 15b at a predetermined angle or less is absorbed by the external light shielding portion 15 without being totally reflected according to the difference in refractive index between the light shielding pattern layer 12 and the external light shielding portion 15.

3 is a cross-sectional view showing a display filter 100 according to an embodiment of the present invention. As shown in FIG. 3, the display filter 100 according to an exemplary embodiment of the present invention includes an antireflection film 20, a transparent glass substrate 30 formed on the antireflection film 20, and the transparency. With the electromagnetic shielding film 40 formed on the glass substrate 30, the visibility enhancement film 10 formed on the electromagnetic shielding film 40 and the color correction film 50 formed on the visibility enhancement film 10 It is composed. In this case, the antireflection film 20, the transparent glass substrate 30, the electromagnetic shielding film 40, the visibility enhancement film 10 and the color correction film 50 may be laminated and formed in a different order from the illustrated order. It is self-evident.

Hereinafter, in an embodiment of the present invention, the layers corresponding to the electromagnetic shielding function and the antireflection function are separately described as separate ones, but the present invention is not limited thereto. That is, the display filter according to an embodiment of the present invention necessarily includes a visibility enhancing film 10, and may be composed of one or more layers, and each layer may have an electromagnetic shielding function, an antireflection function, or a combination thereof. It can have a combination function.

The anti-reflection film 20 is formed on the other surface of the transparent glass substrate 30, but the present invention is not limited to this stacking order. Preferably, as shown in Figure 3, the anti-reflection film 20 is formed on the side to be the viewer side when the PDP filter 100 is mounted on the PDP device, that is, the opposite side to the panel assembly side to be. Such an antireflection film 20 may improve visibility by reducing reflection of external light.

Of course, the anti-reflection film 20 may be formed on the surface of the main surface of the PDP filter 100 to be the panel assembly side, thereby further reducing external light reflection of the PDP filter 100. In addition, by forming the antireflection film 20 to reduce the external light reflection of the PDP filter 100, it is possible to improve the visible light transmittance from the panel assembly and increase the contrast ratio. In order to form such an antireflection film 20, a film having an antireflection function may be formed on a substrate by coating, printing, or various conventionally known film forming methods. In addition, the transparent molded article on which the film having an antireflection function is formed or the transparent molded article having an antireflective function can be formed by pasting through any transparent pressure-sensitive adhesive or adhesive.

The antireflection film 20 has a refractive index of 1.5 or less, preferably 1.4 or less in the visible region, and is formed of a thin film of fluorine-based transparent polymer resin, magnesium fluoride, silicon resin, or silicon oxide, such as an optical film thickness of 1/4 wavelength. Monolayers may be used. In addition, the antireflection film 20 may be formed of a thin film of an inorganic compound such as metal oxides, fluorides, silicides, borides, carbides, nitrides, sulfides, or organic compounds such as silicone resins, acrylic resins, and fluorine resins having different refractive indices. A multilayer film in which more than one layer is laminated may be used.

Here, the antireflection film 20 formed of a single layer is easy to manufacture, but has a relatively low antireflection capability compared to the multilayer film. The multilayer film described above has antireflection performance over a wide wavelength range. Such an inorganic compound thin film can be formed by conventionally known methods such as sputtering, ion plating, ion beam assist, vacuum deposition, and wet coating, and the organic compound thin film can be formed by conventionally known methods such as wet coating.

The transparent glass substrate 30 is generally manufactured using a transparent plastic material such as tempered or semi-reinforced glass or acrylic having a thickness of 2.0 to 3.5 mm. Glass has a specific gravity of 2.6, which makes it difficult to reduce the weight and makes the filter thick. Therefore, the weight of the glass increases when it is mounted on the plasma display panel set.

In one embodiment of the present invention, examples of the transparent glass substrate 30 include inorganic compound moldings such as glass and quartz and transparent organic polymer molding.

On the other hand, in order to shield the electromagnetic waves, it is necessary to cover the display surface with a highly conductive object. As the electromagnetic shielding film 40 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. In one embodiment of the present invention, the electromagnetic shielding film 40 is formed on one surface of the transparent glass substrate 30, that is, the surface of the panel assembly side, the present invention is not limited to this arrangement.

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 the material of the metal constituting the conductive mesh film, any metal having excellent electrical conductivity and workability, such as copper, chromium, nickel, silver, molybdenum, tungsten, and aluminum, can be used. In view of workability, copper and nickel are most preferred. The conductive mesh may be formed by laminating a metal thin film and forming a pattern using a photo ethch, and a method of directly forming a metal layer through plating. 1-20 micrometers is preferable and, as for the thickness of this metal layer, it is more preferable to have thickness of 3-10 micrometers. Thinner ones may have a lower electromagnetic shielding capability, and thicker ones may result in longer manufacturing times. In general, the sheet resistance of the substrate on which the metal mesh is formed is 0.5 kW / square or less.

In addition, the multilayer transparent conductive film may use a high refractive transparent thin film represented by indium tin oxide (ITO) for electromagnetic wave shielding. As the multilayer transparent conductive film, a multilayer thin film in which metal thin films such as gold, silver, copper, platinum and palladium, and a high refractive index transparent thin film such as indium oxide, ditin oxide, and zinc oxide are alternately laminated may be used. Among the multilayer transparent conductive films, the metal thin film has high conductivity but high near-infrared shielding ability due to reflection and absorption of metal over a wide wavelength range, but relatively low visible light transmittance. In addition, the high refractive index transparent thin film of the multilayer transparent conductive film is relatively low in conductivity and reflectance of near infrared rays, compared with the use of a metal thin film, but is excellent in transparency. Therefore, the multilayer transparent conductive film in which the metal thin film and the high refractive index transparent thin film are laminated has the characteristics of excellent conductivity, near infrared shielding ability, and visible light transmittance by combining the advantages of the metal thin film and the high refractive index transparent thin film.

In addition, the color correction film 50 preferably has a transmittance of 60% or more in the wavelength range of 580 to 600nm, the color correction film 50 is the amount of red (R), green (G), blue (B). Reduce or adjust the color balance to change or correct it.

Generally, red visible light generated from the plasma in the panel assembly tends to appear orange. The color correction film according to the prior art mainly serves to color correct the orange color having a wavelength range of 580 to 600 nm to red. However, the color correction film 50 according to an embodiment of the present invention has a transmittance of 60% or more with respect to the orange color having a wavelength range of 580 to 600nm, thereby reducing or excluding the role of color correction to orange color red. have.

Various colorants are used to increase the color reproduction range of the color correction film 50 display and to improve the sharpness of the screen. As such a dye, a dye or a pigment can be used. 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, transparent adhesives or adhesives may be used to mutually bond each film or film of the present invention. Specific materials include 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.

4 is an exploded perspective view illustrating a display apparatus 1000 according to an exemplary embodiment of the present invention. As shown in FIG. 4, the display apparatus 1000 according to an exemplary embodiment of the present invention includes a case 140, a cover 140 covering an upper portion of the case 110, and a driving circuit accommodated in the case 110. The substrate 120 includes a panel assembly 130 including a discharge cell in which gas discharge occurs and a PDP filter 100. The PDP filter 100 includes a conductive layer formed of a material having excellent conductivity on the transparent glass substrate, and the conductive layer is grounded to the case 110 through the cover 140. That is, the electromagnetic wave generated from the panel assembly 130 is grounded to the cover 140 and the case 110 through the conductive layer of the PDP filter 100 before reaching the viewer.

Hereinafter, in order to help the understanding of the present invention will be described in more detail through preferred examples and comparative examples.

Example 1

High refractive index acrylic curing resin with a refractive index of 1.55 on one surface between a forming roll having an opposite shape formed on the surface of a pattern roll device equipped with an ultraviolet device and a 188 μm thick optical PET film (manufactured by Toyobo), which is a transparent substrate. The mixed solution was slowly added while being cured and transferred to form a wedge shaped external light shielding pattern. A carbon dispersion having a refractive index of 1.54, prepared by mixing the carbon paste and the high refractive index acrylic curing resin with the formed external light shielding pattern is scattered in the external light shielding part, and is repeatedly used by using a Dr. blade made of soft plastic. Wiping was performed so that the dispersion was evenly filled in the external light shielding portion, and then cured with ultraviolet rays to form a light shielding pattern layer provided with the external light shielding portion.

Then, by using a forming roll having the opposite shape of the external light shielding portion and the lens formed on the surface, the low refractive index urethane acrylic curing resin mixture solution having a refractive index of 1.30 was slowly applied while curing and transferring to form a photorefractive layer. And finally, the visibility improvement film like FIG. 1 was manufactured.

At this time, the pitch between the lenses of the visibility enhancement film is 107.5㎛, the top surface of the external light shielding portion 33.5㎛, the bottom of the external light shielding portion 8㎛, the depth of the external light shielding portion 160㎛, the lens bottom surface 33.5㎛, the lens height is 33.5 The refractive index of the microrefractive layer and the refractive index layer were 1.3 and the thickness of the optical refractive layer was 50 µm.

Example 2

Except that the lens bottom surface was changed to 50㎛ in Example 1 was carried out in the same manner as in Example 1.

Example 3

Except for using a high refractive index acrylic curing resin mixture having a refractive index of 1.55 in place of the low refractive index urethane acrylic curing resin mixture having a refractive index of 1.30 when forming a photorefractive layer in the same manner as in Example 1 Was carried out.

Example 4

High refractive index acrylic curing resin mixture liquid having a refractive index of 1.55 on one surface between a forming roll having an opposite shape formed on the surface of a pattern roll device equipped with an ultraviolet device and a 188 μm thick optical PET film (Toyobo), which is a transparent substrate. Was slowly added while curing and transferring to form a wedge shaped external light shielding pattern. A carbon dispersion having a refractive index of 1.54, prepared by mixing the carbon paste and the high refractive index acrylic curing resin with the formed external light shielding pattern, is scattered in the external light shielding part, and is used several times using a Dr. blade made of soft plastic. After wiping, the dispersion was evenly filled in the external light shielding portion and then cured with ultraviolet rays to form a light shielding pattern layer having the external light shielding portion.

Subsequently, a low refractive index urethane acrylic curing resin mixture having a refractive index of 1.30 was coated and cured using a bar coater on the light shielding pattern layer to form a photorefractive layer, thereby manufacturing a visibility improving film as shown in FIG. 2.

At this time, the pitch between the lenses of the visibility enhancement film is 107.5㎛, the top surface of the external light shielding portion 33.5㎛, the bottom surface of the external light shielding portion 8㎛, the depth of the external light shielding portion 160㎛, the refractive index of the light refractive layer is 1.30, light refractive index The thickness of the layer was 50 μm.

Comparative Example 1

A commercially available visibility improvement film (manufactured by DNP) was used.

Contrast ratio was measured by the following method using the visibility improvement films of Examples 1 and 4 and Comparative Example 1, and the results are shown in Table 1 below.

First, using the visibility improving film of Examples 1 and 4 and Comparative Example 1 to prepare a PDP filter laminated in the order of the antireflection film, transparent glass substrate, electromagnetic shielding film, visibility enhancement film and color correction film, The prepared PDP filter was attached to the PDP module, set in a fixed frame, and contrast was measured with a luminance meter at a distance of 1.5 m under a spot environment (150 Lux).

division Example 1 Example 4 Comparative Example 1 Visibility Enhancement Film Transmittance (%) 75.1 71.1 67 PDP filter transmittance (%) 48 43 40 Contrast Ratio in PDP Devices 400: 1 330: 1 310: 1

As shown in Table 1, the PDP device manufactured by using the visibility enhancement films prepared in Examples 1 and 4 according to the present invention has a contrast ratio in a spot environment as compared to currently available visibility enhancement films. It was confirmed that excellent. In particular, in the case of Example 1 having a lens in the photorefractive layer it was confirmed that the contrast ratio is significantly superior compared to Comparative Example 1 without the photorefractive layer.

Although only described in detail with respect to the described embodiments of the present invention, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, it is natural that such variations and modifications belong to the appended claims. .

According to the present invention, as compared with the conventional visibility enhancing film, the image source light can be transmitted more effectively, and the image and reflected light by the external environment light can be effectively shielded, so that the luminance and the viewing angle can be more efficiently expanded, and the contrast can be increased on the spot. There is an advantage.

Claims (18)

A light shielding pattern layer facing the viewer and having an external light shielding portion; And And a light refractive layer formed to face the light blocking pattern layer and face the image light source side. The refractive index N _x of the portion of the light shielding pattern layer excluding the external light shielding portion has a value greater than or equal to the refractive index N _y of the external light shielding portion, and the refractive index N _x of the portion of the light shielding pattern layer excluding the external light shielding portion is the light. the refractive index of the refractive layer visibility enhancement film to satisfy the following condition with a value equal to or greater than (N _z). The method of claim 1, The external light shielding portion, the angle (θ) formed by the normal of the surface (image light source surface) to which light is incident from the panel assembly and the inclination surface of the external light shielding portion is a visibility improvement film, characterized in that. The method of claim 1, The external light shield, Transparent resins; And A light-absorbing material comprising a single material selected from the group consisting of a black inorganic material, a black organic material, a metal, a pigment, and a dye or a mixture of two or more selected from these. The method of claim 3, The light absorbing material is a visibility improving film, characterized in that formed in 2 to 20% with respect to the total volume of the light shielding pattern layer. The method of claim 1, The photorefractive layer further comprises a concave lens, The concave lens is formed on the image light source side surface of the light refractive layer in the form of a groove open toward the image light source side, The inside of the groove constituting the concave lens is empty or is filled with a material having a lower refractive index than the light refractive layer is characterized in that the visibility enhancement film. The method of claim 5, The said concave lens is in a vacuum state with the groove | channel empty, The visibility improvement film characterized by the above-mentioned. The method of claim 6, The concave lens is a visibility improving film, characterized in that the length of the bottom surface is formed to be 60 to 180% of the length of the bottom surface of the external light shield. The method of claim 6, The height of the concave lens, the visibility improvement film, characterized in that the height of 0.6 to 1.4 times the half length of the lens bottom surface. The method of claim 5, The concave lens is filled therein with a material having a refractive index of a value smaller than the refractive index of the light refractive layer. The method of claim 9, The concave lens is a visibility improving film, characterized in that the length of the bottom surface is formed to be 60 to 180% of the length of the bottom surface of the external light shield. The method of claim 9, The concave lens has a height of 0.8 to 2.8 times the half length of the lens bottom surface, the visibility improvement film. delete The method of claim 1, The light refractive layer has a thickness of 10 to 100㎛, visibility improvement film. The method of claim 1, The refractive index difference (N _x -N _y ) of the refractive index (N _x ) and the external light shielding refractive index (N _y ) of the portion of the light shielding pattern layer excluding the external light shielding portion is 0.05 or less. The method of claim 1, The refractive index difference (N _x -N _z ) of the refractive index (N _x ) and the refractive index (N _z ) of the light refractive layer of the portion of the light shielding pattern layer excluding the external light shielding portion is 0.26 or less. A display filter comprising at least one of the visibility enhancing film according to any one of claims 1 to 11 and 13 to 15. The method of claim 16, The display filter, the anti-reflection film; A transparent glass substrate formed on the antireflection film; An electromagnetic shielding film formed on the transparent glass substrate; Visibility enhancing film formed on the electromagnetic shielding film; And And a color correction film formed on the visibility enhancing film. A panel assembly 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 And a display filter according to claim 16, which is disposed opposite to the front substrate of the panel assembly.

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