KR101047488B1 - Display device filter and display device having same - Google Patents

Abstract

The present invention provides a filter for a display device mounted on a front side of a display panel, the filter including an external light shielding layer having an external light shielding pattern, wherein the CIE color coordinates of the front surface of the filter for a display device under a D65 light source are -2.0 ≤ a * ≤ 2.0,- Provided is a filter for a display device, wherein 2.0 ≦ b * ≦ 2.0. In addition, the present invention is a filter for a display device mounted on the front of the display panel, comprising an external light shielding layer having an external light shielding pattern, the CIE color coordinate of the front surface of the filter for a display device under a D65 light source is 60≤L * ≤80 A filter for a display device is provided. In addition, the present invention is a filter for a display device to be mounted on the front of the display panel, the first pigment having an external light shielding layer formed with an external light shielding pattern, absorbing light of a wavelength of 380 ~ 480 nm, and 450 ~ 550 nm The present invention provides a filter for a display device, comprising a second dye that absorbs light of a wavelength and a third dye that absorbs light of a wavelength of 560 to 620 nm. Preferably, the color correction layer comprises a polymer resin, wherein the first pigment, the third pigment is contained in each of 0.01 to 1% by weight relative to the polymer resin, the second pigment is 0.01 to 2% by weight relative to the polymer resin % Is included. In addition, the present invention provides a display device having the filter.

Description

Filter for display device and display device having same {filter for display apparatus and display apparatus having the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a display device and a display device having the same, and more particularly, to improve contrast ratio in light room, and to prevent moire phenomenon. The present invention relates to a filter for a display device, and a display device having the same.

As the modern society becomes more and more information, photoelectronics related parts and devices are remarkably advanced and spread. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses for 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 a larger size and a thinner thickness than a 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, the PDP device is easier to be enlarged than other display devices, and is considered as a thin light emitting display device having the most suitable characteristics as a high quality digital television 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.

The PDP device includes a display panel including discharge cells in which gas discharge occurs, and a PDP filter that shields electromagnetic waves and near infrared rays. Since the PDP filter is mounted on the front of the display panel, transparency must be satisfied at the same time.

In the PDP device according to the related art, external environment light may pass through the PDP filter and flow into the display panel under bright conditions, that is, bright room conditions. In this case, the panel light generated in the discharge cells in the display panel overlaps with external environmental light introduced through the PDP filter from the outside. As a result, the contrast ratio is lowered in the bright room condition, resulting in poor display capability of the PDP device.

In addition, in the case of the PDP device according to the prior art, the moiré phenomenon occurs due to the interference of the periodic pattern between the pixels constituting the PDP device and the PDP filter, thereby reducing the screen display capability of the PDP device.

On the other hand, the PDP filter is assembled into a PDP module and a cabinet to be completed in a set, in particular, it plays an important role in indicating the appearance of the PDP device in the power-off state. However, the conventional PDP filter is simply considered and designed only from the functional point of view, such as electromagnetic shielding, near-infrared shielding, neon light shielding, etc., there is a limit that does not satisfy the consumer satisfaction with the product because the appearance quality is not excellent.

This can be found in the fact that the filter can be designed in consideration of the visual point of view without the functional point of view due to the characteristics of the filter through which the screen light is transmitted.

However, in recent years, according to the consumer's preference for products that recognize even home appliances such as TVs, refrigerators, and air conditioners as part of interior and exterior interiors, the appearance of the display device is becoming an important issue in product design. As a result, attempts have been made to enhance the appearance of cabinets, especially by manufacturers. However, there is no clear way to improve the appearance of the screen part which is located in front of the product and visually attracts the most viewers.

In addition, the conventional filter has a problem of lowering the image quality. In particular, when displaying a black image such as darkness, there was a problem in that it does not properly express black. As consumers' eye level is gradually increasing, the demand for natural colors is strongly demanded, and the situation is emphasized to minimize the loss of images sent from broadcasting stations.

The present invention has been made to solve the above problems, an object of the present invention is to improve the contrast in the bright room conditions, and to prevent the moiré phenomenon.

In addition, an object of the present invention is to provide an excellent appearance quality to the display device.

In addition, an object of the present invention is to prevent degradation of the image quality of the display device. The purpose of the present invention is to maintain the image quality closer to the actual color by making the display device have excellent color reproducibility without degrading the color purity.

In addition, the present invention provides a filter for a display device that can achieve the above object efficiently without further processing by additionally defining the optimal color coordinate value and determining the pigment formulation accordingly in achieving the above object. There is a purpose.

In order to achieve the above object, the present invention is a filter for a display device mounted on the front of the display panel, comprising an external light shielding layer formed with an external light shielding pattern, the CIE color coordinates of the front surface of the filter for the display device under a D65 light source- A filter for a display device is provided, wherein 2.0 ≦ a * ≦ 2.0 and −2.0 ≦ b * ≦ 2.0.

In addition, the present invention is a filter for a display device to be mounted on the front of the display panel, comprising an external light shielding layer formed with an external light shielding pattern, the CIE color coordinates of the front surface of the filter for a display device under a D65 light source is 60≤L * ≤ A filter for a display device, characterized by being 80.

Preferably, the bias angle α formed between the advancing direction of the external light shielding pattern and the long side of the filter for a display device is 1.5 to 80 degrees.

In addition, the present invention is a filter for a display device to be mounted on the front of the display panel, the first pigment having an external light shielding layer formed with an external light shielding pattern, absorbing light of a wavelength of 380 ~ 480 nm, and 450 ~ 550 nm The present invention provides a filter for a display device, comprising a second dye that absorbs light of a wavelength and a third dye that absorbs light of a wavelength of 560 to 620 nm.

Preferably, the color correction layer comprises a polymer resin, the first pigment and the third pigment are each contained 0.01 to 1% by weight relative to the polymer resin, the second pigment is 0.01 to 2% by weight relative to the polymer resin % Is included.

In addition, the present invention provides a display device having the filter.

According to the above configuration, the present invention can improve the brightness and contrast ratio of the display device.

In addition, the moire phenomenon and the Newton ring phenomenon can be effectively prevented by arranging the external light shielding pattern at a predetermined bias angle or by arranging the external light shielding pattern and the electromagnetic shielding layer at a predetermined bias angle.

In addition, the present invention can provide an excellent appearance quality to the display device.

In addition, the present invention can prevent the deterioration of the image quality of the display apparatus. By making the display device have excellent color reproducibility without degrading the color purity, the image quality can be maintained closer to the actual color.

In addition, the present invention simply defines the optimal color coordinate value, and thus determines the pigment formulation, so that the above effects can be efficiently achieved without additional steps.

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

1 is a cross-sectional view showing a PDP filter according to a first embodiment of the present invention.

The filter 200 of FIG. 1 includes a color correction layer 240, a transparent substrate 210, an electromagnetic wave shielding layer 220, an external light shielding layer 230, and a protective layer 280.

As the transparent substrate 210, semi-tempered glass or transparent polymer resin can be used.

The electromagnetic wave shielding layer 220 is typically an electromagnetic shielding layer of a conductive mesh layer type or a conductive film layer type.

The conductive mesh layer has a structure in which a metal mesh pattern is formed on a substrate.

In general, the conductive mesh layer may be a metal coated with a grounded metal mesh or a mesh of synthetic resin or metal fiber.

As the material of the metal constituting the metal mesh pattern, for example, copper, chromium, nickel, silver, molybdenum, tungsten, aluminum, and the like can be used as long as the metal has excellent electrical conductivity and processability.

The substrate of the conductive mesh layer may include a dimonium-based near infrared absorbing dye, in which case the conductive mesh layer has a green or brown color.

More preferred embodiments of the conductive mesh layer will be described in detail with reference to FIG. 6.

The conductive layer is made of metal thin film 221 such as gold, silver, copper, platinum, palladium, high indium tin oxide (ITO), ditin tin oxide, zinc oxide (ZnO), and zinc oxide (AZO) doped with aluminum. The refractive index transparent thin films may be alternately stacked to form a multilayer transparent thin film. Typically the conductive layer has a blue or green color.

The protective layer 280 is formed to prevent oxidation of the external light shielding layer, adhesion of impurities, and the like.

The external light shielding layer 230 includes a support 232, a transparent resin substrate 234, and an external light shielding pattern 236 formed on one surface of the substrate.

The external light shielding pattern 236 is formed by filling a light absorbing material such as carbon black and curing the intaglio pattern having a predetermined cross-sectional shape. The light absorbing material absorbs the external environment. .

In addition, the external light shielding pattern 236 may be filled with a conductive material. As the conductive material, silver paste or the like can be used. When the conductive material is filled in the external light shielding pattern to supplement the electromagnetic wave shielding function, a conductive film layer having a reduced number of stacks of one to three times as compared to the conventional one may be used as the electromagnetic shielding layer.

The external light shielding pattern 236 may have a stripe pattern when viewed from the front. The external light shielding pattern is typically made of a wedge-shaped stripe, that is, a plurality of intaglio three-dimensional triangular pillar structures, but the present invention is not limited thereto. For example, the external light shielding pattern may be embossed, or may have a two-dimensional or three-dimensional shape in the form of an intaglio.

In addition to the wedge-shaped cross section, the external light shielding pattern may have various cross-sectional shapes such as rectangular, trapezoidal, and U-shaped.

In the external light shielding pattern 236, the wedge-shaped rear surface of the external light shielding pattern parallel to one surface of the substrate 234 faces the display panel, but the present invention is not limited thereto. That is, the wedge-shaped back surface of the external light shielding pattern parallel to one surface of the substrate may face the viewer, and the external light shielding pattern may be formed on both the front and the back of the substrate.

The external light shielding layer 230 absorbs external light to prevent external environment light II from entering the display panel and totally reflects the panel light I emitted from the display panel toward the viewer. Thus, a high transmittance to visible light and a high contrast ratio can be obtained.

In addition to the external light shielding layer, the filter according to the present invention has excellent absorption of external light because the absorption of external light is made by the color correction layer as described later.

The external light shielding pattern 236 may be filled with a resin in which a polymer resin, a binder, and the like are mixed together with the light absorbing material and the conductive material described above.

More preferred embodiments of the external light shielding layer will be described in detail with reference to FIGS. 2 to 6.

The color correction layer 240 corrects the color of the filter so that the CIE color coordinates on the front surface of the filter have values of -2.0 ≦ a * ≦ 2.0 and −2.0 ≦ b * ≦ 2.0 under a D65 light source. This color coordinate value causes the filter of the present invention to have achromatic color. Therefore, it is possible to minimize the change in color of the panel light I by the filter.

The color correction layer corrects colors such that the filter of the present invention has a L * value of 60 ≦ L * ≦ 80 of the CIE color coordinates under a D65 light source.

Table 1 shows that the a * and b * values satisfy -2.0 ≤ a * ≤ 2.0 and -2.0 ≤ b * ≤ 2.0, but the L * values are tested by mounting different filters on the product and then evaluating each item. to be.

L * <60 60 ≤ L * ≤ 80 80 <L * Appearance at power off Great Great Bad Luminance at power ON Bad Great Great Clear contrast ratio at power ON Great Great Bad Moiré phenomenon removed when power is ON Great Great Bad

As can be seen from Table 1, when the filter has a value of 60 ≤ L * ≤ 80, it can be seen that excellent evaluation results for each item.

When the L * value is less than 60, the luminance is low, and the viewer may feel frustrated when watching. In order to compensate for this, when the discharge voltage is increased, the power consumption increases and the use of the withstand voltage component increases the cost of the product and causes a problem of shortening the lifetime of the phosphor due to the use of the high voltage.

On the contrary, when the L * value exceeds 80, the transmittance is very large, and the achromatic function of the present invention is deteriorated, so that the color of the surface of the PDP module is exposed to the front as it is and the blackness is reduced when the power is turned off. In addition, the absorption rate of external ambient light is lowered, the brightness and contrast ratio is lowered, and the risk of occurrence of moiré phenomenon is relatively increased.

On the other hand, when the L * value is 60 ≤ L * ≤ 80, a good contrast ratio (BRCR) and a moiré removing effect (especially, a second moiré removing effect) are obtained that are excellent in appearance quality and luminance efficiency and have a large external light absorption. Can be.

In this invention, the contrast ratio improvement effect by an achromatic filter is added to the contrast ratio improvement by an external light shielding layer, and a very high contrast ratio can be obtained.

In order to obtain a higher contrast ratio only by the external light shielding layer, the contrast ratio may be improved by increasing the black density of the external light shielding pattern or by changing the wedge shape. However, in the case of changing the wedge shape, the length of the wedge may be longer, and the vertical viewing angle may be worse.

In comparison with this, the achromatic filter has a black color when the product is installed, so the effect of increasing the contrast ratio will be greater.

In addition, as described later, the moiré removal effect by the achromatic color filter is added to the moiré removal effect by the bias control of the external light shielding pattern and the mesh pattern and the anti-glare surface treated diffusion layer, thereby suppressing the moiré phenomenon as much as possible. It becomes possible.

In more detail, in the PDP device, the moire phenomenon occurs due to the discharge cells of the display panel, the grid of the mesh pattern, and the stripe of the external light shielding pattern.

By adjusting the bias of the mesh pattern and the external light shielding pattern, the primary moiré due to the panel light can be removed, and the secondary moiré due to the external light can be removed by the external light absorption effect of the achromatic filter. The achromatic filter was found to be effective in removing the first moiré. This is because the first moiré appears black or white.

The various members used in the PDP filter, the near-infrared shielding layer, the color correction layer, the conductive layer, and the like each have a unique color, and the PDP filter in which these are combined also has a specific body color.

In the present invention, considering that the cabinets of most PDP devices are glossy black, matte black, or silver series, the body color of the PDP filter satisfies the L *, a *, b * values of the CIE color coordinates. Make it achromatic.

Through this, the present invention allows the PDP device to have an excellent appearance quality in the power off state.

In addition, even when the power is turned on, the color of the panel light due to the body color of the filter is prevented from being prevented, and the actual color of the screen is displayed to the viewer to provide improved image quality. In particular, even when displaying a black image such as darkness, it is possible to provide excellent image quality by properly expressing black.

On the other hand, look at the improvement of the light and dark contrast ratio by the above-described external light absorption through the formula as follows.

Brightness / Contrast Ratio = (luminance of white light + luminance of reflected light) / (luminance of black light + luminance of reflected light)

Therefore, in the present invention, the brightness of the denominator and the reflected light of the molecules are lowered to improve the clear and dark contrast ratio. Since the brightness of white light is much greater than that of black light and that of reflected light, the brightness and contrast ratio can be increased by lowering the brightness of reflected light.

Hereinafter, the combination of the dye for achieving the color coordinate value mentioned above is demonstrated.

The electromagnetic shielding layer has a color as described above. In addition, the neon cut absorbing dye generally used in the conventional color correction layer absorbs light in the region of 560 nm to 620 nm so that the amount of light transmitted in the blue or green region is relatively greater than the amount of light transmitted in the red region.

Therefore, in the present invention, a dye for absorbing light in the blue and green areas is appropriately added to the color correction layer in addition to the neon cut absorbing dye so that the light in the red, green, and blue areas can equally pass through the filter.

The color correction layer contains two or more pigments and a polymer resin.

In the color correction layer, a first dye that absorbs light having a wavelength of 380 nm to 480 nm is 0.01 to 1 wt% of the polymer resin, and a second dye that absorbs light having a wavelength of 450 nm to 550 nm is 0.01 to 2 wt% of the polymer resin. In addition, the third pigment absorbing light having a wavelength of 560 nm to 620 nm is included in an amount of 0.01 to 1 wt% based on the polymer resin.

When the blending ratio of the dye is outside the above range, for example, less than 0.01% by weight, the amount of light absorbed at the wavelength decreases, so that the transmittance of the light at the wavelength increases, and when the amount of the pigment is greater than 1% by weight (2% by weight in the case of the second pigment). The amount of light absorbed at the wavelength is excessive, so that the transmittance of light at the wavelength is reduced. The higher the amount of pigment blended, the lower the L * value. The smaller the amount of pigment blended, the higher the L * value.

As a result of the test, the preferred blending ratio of each pigment was found to be 0.01 to 1% by weight for the first and third pigments and 0.01 to 2% by weight for the second pigment, as described above.

Each pigment optionally absorbs light in a range of wavelengths, each exhibiting a maximum absorption at its own wavelength. According to an embodiment, the first dye exhibits maximum absorption in light of 438 nm wavelength, the second pigment exhibits maximum absorption in light of 524 nm wavelength, and the third pigment exhibits maximum absorption in light of 593 nm wavelength. Can be. The first pigment absorbs light in a blue region, the second pigment absorbs light in a green region, and the third pigment serves as a neon cut.

The pigments which selectively absorb light include cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium, nickeldithiol, azo, stryl, phthalocyanine, methine, porphyrin, Dyes such as azaporphyrin-based;

The color correction layer may play a role of antireflection as well as improving color purity.

A filter according to a preferred embodiment of the present invention exhibits a minimum transmittance of 10% to 40% of light at wavelengths of 550 nm to 600 nm. In addition, the filter for a display device has an average transmittance of 50% or less of light having a wavelength of 450 nm to 550 nm.

Test Example

First dye (the yellow dye of Ciba's Orasol series) absorbs the light in the 380nm to 480nm region with respect to the PET resin in the color correction film, and the second dye (the Orasol series from the Ciba Corporation) absorbs light in the 450nm to 550nm region Heavy red pigment) and a third dye (azaporphyrin-based pigment) that absorbs light in the 560nm to 620nm region to prepare a color correction film.

Next, the color correction film manufactured on one side of the semi-tempered glass substrate was bonded, and an electromagnetic wave shielding layer was formed on the other side of the semi-tempered glass substrate to prepare filters of the first and second test examples. The content of the dye used in the color correction layer of the filter of the first test example and the second test example and the type of the electromagnetic shielding layer is summarized in Table 2 below.

On the other hand, the content of the dye used in the filter of the first comparative example using only the third dye which is a neon cut dye and the second comparative example using only the second dye and the third dye and the kind of the electromagnetic wave shielding layer are similarly summarized in Table 2 below. .

Electromagnetic shielding layer First pigment Second pigment Tertiary pigment Test Example 1 Conductive coating layer 0.7 wt% 0.7 wt% 0.12 wt% Test Example 2 Conductive mesh layer 0.7 wt% 0.8 wt% 0.12 wt% Comparative Example 1 Conductive layer - - 0.12 wt% Comparative Example 2 Conductive mesh layer - 0.7 wt% 0.12 wt%

The body color of the PDP filter according to Examples 1 to 2 and Comparative Examples 1 to 2 was measured using a D65 light source, a CIE 1934 L * a * b *, and a spectrophotometer. It is summarized in Table 3 below.

L * a * b * Test Example 1 70.86 0.079 -0.83 Test Example 2 70.52 -0.61 1.03 Comparative Example 1 80.06 -4.72 -12.29 Comparative Example 2 72.23 1.5 -6.00

As can be seen from Table 3, the filters of Test Examples 1 and 2 show achromatic colors because the values of a * and b * are close to zero. On the contrary, in the first to second comparative examples, the color of the entire surface of the PDP filter has a blue or green color.

In FIG. 1, the filter 200 including the color correction layer 240, the transparent substrate 210, the electromagnetic shielding layer 220, the external light shielding layer 230, and the protective layer 280 is illustrated. In addition, as shown in Figure 2 may include an antireflection layer. In addition, although not shown, the filter of the present invention may include a near infrared shielding layer. The near-infrared shielding layer may be formed as a separate layer. For example, the near-infrared shielding layer may be configured as a hybrid layer including a near-infrared material in the color correction layer of FIG. 2.

However, these layers may be removed from the filter in some embodiments, or more various layers not illustrated above may be included as constituent layers of the filter.

In addition, the stacking order may also have various modified embodiments, and may have a hybrid layer that performs a combination of functions performed by two or more layers.

For example, the external light shielding layer may be formed between the transparent substrate and the electromagnetic shielding layer.

In addition, in FIG. 1, the color correction layer 250 shows an embodiment positioned in front of the external light shielding layer 230, but as shown in FIG. 2, the color correction layer is positioned behind the external light shielding layer. It is possible. However, the color correction layer may be preferably located in front of the viewer, as close to the viewer as possible. For example, it may be preferable to be located in front of the rear of the transparent substrate.

The closer the color correction layer is to the viewer, the more the external light absorbing effect can be further improved. In other respects, the present invention provides an advantage in that the color correction layer having the external light absorbing effect can be located closer to the viewer. Can have

2 is a cross-sectional view illustrating a PDP filter according to a second embodiment of the present invention, and FIG. 3 is a perspective view illustrating an external light shielding layer used in the PDP filter of FIG. 2.

2 and 3, the PDP filter 200 according to an embodiment of the present invention includes a filter base 270 and an external light shielding layer in which layers having various shielding functions are formed on the transparent substrate 210. 230).

Here, the filter base 270 is formed by stacking the transparent substrate 210, the antireflection layer 250, or the electromagnetic shielding layer 220 in any order. 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 filter base 270 according to an embodiment of the present invention may be composed of one or more layers, and each layer may have an electromagnetic shielding function, an antireflection function, or a combination thereof. In addition, the filter base 270 may have all of the aforementioned electromagnetic shielding function, antireflection function, or a combination thereof, or may have only one of them.

The external light shielding layer 230 may be disposed on one surface of the filter base 270. The external light shielding layer 230 of the embodiment shown in FIG. 2 is disposed on the side of the display panel side of the filter base 270, that is, on the side opposite to the viewer side when the PDP filter 200 is mounted to the PDP device. The present invention is not limited thereto, and the same effect and effect may be obtained when the external light shielding layer 230 is disposed on the other surface of the filter base 270.

2 and 3, the external light shielding layer 230 is formed in the support 232, the substrate 234 formed on one surface of the support 232, and the substrate 234, and the external environmental light flowing into the display panel from the outside. External light shielding pattern 236 that blocks 320 is included. In the present embodiment, the external light shielding pattern 236 is composed of a plurality of wedge-shaped black strips (black stripe) spaced apart from each other at regular intervals.

Here, the substrate 234 on which the external light shielding pattern 236 is formed may be formed directly on the filter base 270, but as shown in FIG. 2, the substrate 234 is formed on the support 232 and then the filter base ( 270). The supporter 232 supports the substrate 234 on which the external light shielding pattern 236 is formed. In the embodiment illustrated in FIG. 2, one surface of the substrate 234 and the filter base 270 are coupled through the support 232, but the present invention is not limited thereto. That is, since the support 232 serves to support the substrate 234, when the external light shielding layer 230 is disposed on the other surface of the filter base 270, the substrate 234 and the filter base 270 may be formed. It may be combined directly.

In one embodiment of the present invention, the support 232 is preferably a transparent resin film having ultraviolet transmittance. As the material of the support 232, for example, polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC) and the like may be used. Of course, the support 232 may be a film having an inherent function of a filter, for example, an antireflection layer 250, a color correction layer 240, or an electromagnetic shielding layer 220.

In addition, the external light shielding pattern 236 has a wedge shape in cross section, and a plurality of black stripe patterns are formed on a surface of the substrate 234 facing the display panel (not shown) at regular intervals to be spaced apart from each other to form external environment light 320. ) Is prevented from flowing into the display panel.

The substrate 234 may be formed of an ultraviolet curable resin, and the external light shielding pattern 236 may be formed of a black inorganic material and / or an organic material and a metal that may absorb light. Particularly, in the case of metal, since the electrical conductivity is large, that is, the electrical resistance is low, when the external light shielding pattern 236 is formed by adding the metal powder, the external light shielding pattern 236 is possible because the electrical resistance can be adjusted according to the concentration of the metal powder. ) Can perform the electromagnetic shielding function. Furthermore, when the surface is black or using black metal, external light shielding and electromagnetic shielding can be efficiently implemented. As the external light shielding pattern 236, an ultraviolet curable resin containing carbon may be used.

The external light shielding pattern 236 of the present invention is formed by a roll molding method, a heat press method using a thermoplastic resin, or by filling a thermoplastic or thermosetting resin in a substrate 234 on which a shape opposite to the external light shielding pattern 236 is transferred. It may be formed by an injection molding method or the like. In addition, when the ultraviolet curable resin constituting the substrate 234 has an antireflection function, an electromagnetic shielding function, a color control function, or a combination thereof, the external light shielding layer 230 may additionally perform these functions. .

The external light shielding pattern 236 constituting the external light shielding layer 230 absorbs the external ambient light 320 to prevent the external ambient light 320 from entering the display panel, and blocks the panel light 310 from the display panel. It acts as a total reflection to the viewer. Thus, a high transmittance to visible light and a high contrast ratio can be obtained.

The PDP device preferably has a high transmittance to visible light and a high contrast ratio. Here, the contrast ratio may be expressed as in Equation 1 below.

When the area ratio of the bottom surface of the external light shielding pattern 236 to the one surface of the substrate 234 is 20-50%, the maximum contrast ratio can be obtained with the minimum loss of transmission amount. More preferably, when the area ratio of the bottom surface of the external light shielding pattern 236 to one surface of the substrate 234 is 25 to 35%, a better effect can be obtained.

On the other hand, the external light shielding layer 230 itself has a transmittance of 70% or more in the visible light wavelength band. The panel light 310 from the display panel is incident in a direction substantially perpendicular to the external light shielding layer 230, and some of the panel light 310 is absorbed by the external light shielding pattern 236, but most of the panel light 310 is emitted. ) Passes through the base material 234 and immediately transmits, thereby increasing the transmittance of the PDP device.

Moire fringes may occur due to the periodic pattern of the discharge cells of the display panel (see 600 of FIG. 4A) (see 660 of FIG. 4A) and the periodic pattern of the external light shielding pattern 236 of the external light shielding layer 230. have.

The moiré pattern represents an interference fringe that is created when two or more periodic patterns overlap. In order to block the moiré pattern caused by the interference between the discharge cell and the external light shielding layer, as shown in FIG. 3, the extension line of the external light shielding pattern 236 and the long side of the substrate 234 cross each other at a predetermined angle. To place. Here, in order to effectively block the moire fringe, it is preferable that the bias angle α defined by the crossing angle between the extension line of the external light shielding pattern 236 and the long side of the substrate 234 is about 1.5 to 80 degrees.

Hereinafter, referring to Table 4, the degree to which the moiré phenomenon occurs according to the change of the bias angle α will be described. The panel assembly having a pixel pitch (see P1 in FIG. 4A) of about 0.5 to 2.5 mm (see 600 in FIG. 4A), and the pitch P2 of the black stripe-shaped external light shielding pattern 236 is about 0.07-0.11 mm. By using the external light shielding layer 230, the bias angle α is set to 0 °, 4 °, 5 °, 10 °, 20 °, 35 °, 40 °, 50 °, 60 °, 70 °, 80 °, Thirteen test samples set at 81 ° and 90 ° were prepared. Then, the presence or absence of the moiré phenomenon by the interference between the pixel of the display panel (refer 600 of FIG. 4A) and the external light shielding pattern 236 of the external light shielding layer 830 was investigated.

(Where, ○: moiré phenomenon does not appear, ×: moiré phenomenon appears)

As shown in Table 4, the presence or absence of moiré phenomenon may be determined as the pitch and width of the external light shielding pattern 236 change. When the bias angle α is about 1.5 to 80 degrees, it can be seen that the moiré phenomenon does not occur regardless of the change in the pitch and width of the external light shielding pattern 236.

It is important to note that even when the bias angle is out of the range of 1.5 to 80, for example, a bias angle of 0 degrees, the moiré removal effect is more effective than without the external light shielding pattern. That is, in this invention, the bias angle of 1.5-80 degree is proposed as a more preferable bias angle.

In order to prevent the moiré phenomenon, an interference phenomenon may be prevented from occurring by adjusting the pitch P1 of the pixel and the pitch P2 of the external light shielding pattern 236. Furthermore, since the mutual control of the pitches P1 and P2 may be difficult to be precisely implemented by the process margin, the external light shielding layer 230 may be disposed on the display panel (see 600 of FIG. 6A) where pixels are arranged in a predetermined pattern. By arranging the external light shielding pattern 236 at a predetermined bias angle α, it is possible to more effectively prevent the moiré phenomenon.

Referring back to FIG. 2, the filter base 270 has a structure in which an electromagnetic shielding layer 220 formed on one surface of the transparent substrate 210 and an antireflection layer 250 formed on the other surface of the transparent substrate 210 are stacked. Have However, the present invention is not limited to the stacking order, and the filter base 270 may have a structure in which the transparent substrate 210, the antireflection layer 250, or the electromagnetic shielding layer 220 are stacked in any order.

Here, the transparent substrate 210 is generally manufactured using a transparent plastic material such as tempered or semi-reinforced glass or acrylic having a thickness of about 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. However, the transparent substrate 210 may be excluded according to the specification of the filter base 270.

In one embodiment of the present invention, examples of the transparent substrate 210 include inorganic compound moldings such as glass and quartz and transparent organic polymer molding.

Acrylic or polycarbonate is generally used as the transparent substrate 210 formed of the organic polymer molding, but the present invention is not limited to these embodiments. The transparent substrate 210 preferably has high transparency and heat resistance, and a polymer molding and a laminate of polymer molding may be used as the transparent substrate 210. As for the transparency of the transparent substrate 210, 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 molding may be transparent in the visible wavelength region, and specific examples thereof include polyethylene terephthalate (PET), polysulfone (PS), polyether sulfone (PES), polystyrene, polyethylene naphthalate, polyarylate, and poly Ether ether ketone (PEEK), polycarbonate (PC), polypropylene (PP), polyimide, triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), and the like, but are not limited thereto. Among them, polyethylene terephthalate (PET) is preferred in view of price, heat resistance and transparency.

Although not shown, the filter base 270 according to an embodiment of the present invention may separately include a near infrared shielding layer. The near-infrared shielding layer serves to shield powerful near-infrared rays generated from the display panel and causing malfunction of electronic devices such as a wireless telephone or a remote controller.

In the embodiment of the present invention, when the electromagnetic shielding layer 220 uses a multilayer transparent conductive film in which a metal thin film and a high refractive index transparent thin film are stacked, 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 220 without separately forming the near infrared shielding layer. Of course, also in this case, the near-infrared shielding layer mentioned later can also be formed separately.

When the conductive mesh film is used as the electromagnetic shielding layer 220 in one embodiment of the present invention, in order to shield the near infrared rays emitted from the display panel, a polymer resin containing near infrared absorbing dyes that absorb wavelengths in the near infrared region may be used. have. For example, organic dyes of various components such as cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium, and nickel dithiol may be used as the near infrared absorbing dye. Since PDP devices emit strong near infrared rays over a wide wavelength range, it is necessary to use a near infrared shielding layer capable of absorbing near infrared rays over a wide wavelength range.

In the exemplary embodiment of the present invention, when the transparent conductive film is used as the electromagnetic shielding layer 220, the electromagnetic shielding ability may be lower than that when the conductive mesh film is used. However, the metal powder is added to the external light shielding pattern 236 to shield the electromagnetic wave. In the case of supplementing or reinforcing the film, a transparent conductive film can realize a sufficient electromagnetic shielding function.

The antireflection layer suppresses reflection of external light to improve visibility.

The antireflection layer is formed of a fluorine-based transparent polymer resin, a magnesium fluoride, a silicon resin, a silicon oxide thin film, or the like having a low refractive index of 1.5 or less, preferably 1.4 or less, in the visible region, for example, by an optical film thickness of 1/4 wavelength. A single layer formed can be used.

In addition, a layer of two or more layers of inorganic compounds such as metal oxides, fluorides, silicides, borides, carbides, nitrides, and sulfides having different refractive indices or organic compounds such as silicone resins, acrylic resins, and fluorine resins is used as an antireflection layer. Can be used. For example, the antireflection layer may have a structure in which a low refractive index oxide film such as SiO ₂ and a high refractive index oxide film such as TiO ₂ or Nb ₂ O ₅ are alternately stacked.

The anti-reflection layer 250 according to an embodiment of the present invention is formed on the other surface of the transparent substrate 210, but the present invention is not limited to this stacking order. Preferably, as shown in FIG. 2, the anti-reflection layer 250 may be formed on the side facing the viewer when the PDP filter 200 is mounted on the PDP device, that is, on the side opposite to the display panel side. The anti-reflection layer 250 may improve visibility by reducing reflection of external light.

Of course, by forming the anti-reflection layer 250 on the surface of the PDP filter 200 which becomes the display panel side, it is possible to further reduce the external light reflection of the PDP filter 200. In addition, by forming the antireflection layer 250 to reduce the external light reflection of the PDP filter 200, it is possible to improve the visible light transmittance from the display panel and increase the contrast ratio.

When sticking each layer or film of this invention, a transparent adhesive or an adhesive agent can be used. 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.

4A is an exploded perspective view illustrating a PDP apparatus including the PDP filter of FIG. 2. 4B is a cross-sectional view taken along line BB ′ of FIG. 4A.

As shown in FIGS. 4A and 4B, a PDP apparatus according to an embodiment of the present invention includes a PDP filter 200 and a display panel 600. The PDP filter 200 is the same as mentioned above, and the display panel 600 will be described in detail below.

As shown in FIG. 4A, a plurality of sustain electrodes 615 are disposed in a stripe shape on the surface of the front substrate 610. Bus electrodes 620 are formed at each sustain electrode 615 to reduce signal delay. The dielectric layer 625 is formed on the surface where the sustain electrode 615 is disposed so as to cover the whole. A dielectric protective film 630 is formed on the surface of the dielectric layer 625. For example, in one embodiment of the present invention, the dielectric protective film 630 may be formed by covering the surface of the dielectric layer 625 with a thin film of MgO using a sputtering method or the like.

On the other hand, a plurality of address electrodes 640 are arranged in a stripe shape on a surface of the rear substrate 635 facing the front substrate 610. The disposition direction of the address electrode 640 is a direction intersecting with the sustain electrode 615 when the front substrate 610 and the rear substrate 635 are disposed to face each other. The dielectric layer 645 is formed on the surface where the address electrode 640 is disposed so as to cover the whole. On the surface of the dielectric layer 645, a plurality of partition walls 650 protruding toward the front substrate 610 while being parallel to the address electrode 640 are provided. The partition wall 650 is disposed in an area between the neighboring address electrode 640 and the address electrode 640.

The phosphor layer 655 is disposed on the side surface of the groove portion formed of the neighboring partition wall 650, the partition wall 650, and the dielectric layer 645. In the phosphor layer 655, a red phosphor layer 655R, a green phosphor layer 655G, and a blue phosphor layer 655B are disposed in each groove portion partitioned by the partition wall 650. These phosphor layers 655 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 655, 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 610 and the rear substrate 635 having such a structure are disposed to face each other, a discharge gas is filled in the discharge cell 660 formed of the groove portion and the dielectric protective film 630. That is, the light emitting cell 660 is formed at each portion of the display panel 600 where the sustain electrode 615 and the address electrode 640 cross between the front substrate 610 and the rear substrate 635. As the discharge gas, for example, a Ne-Xe-based gas, a He-Xe-based gas, or the like can be used.

The display panel 600 having the above structure basically has a light emitting principle such as a fluorescent lamp, and ultraviolet rays emitted from the discharge gas according to the discharge inside the discharge cell 660 excite the phosphor layer 655 to produce visible light. Is converted.

However, phosphor materials having different conversion efficiency into different visible light are used for the phosphor layers 655R, 655G, and 655B of each color used for the display panel 600, respectively. Therefore, when displaying an image on the display panel 600, in general, the color balance is adjusted by adjusting the luminance of each phosphor layer 655R, 655G, 655B. 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 display panel 600 is largely divided into driving for address discharge and driving for sustain discharge. The address discharge occurs between the address electrode 640 and one sustain electrode 615, at which time a wall charge is formed. The sustain discharge is caused by the potential difference between the two sustain electrodes 615 positioned in the discharge cell 660 in which the wall charges are formed. During the sustain discharge, the phosphor layer 655 of the corresponding discharge cell 660 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 610 so that the viewer can recognize it. To form an image.

Hereinafter, the relationship between the display panel 600 and the PDP filter 200 will be described with reference to FIG. 4B.

As shown in FIG. 4B, the PDP filter 200 is disposed above the front substrate 610 of the display panel 600. The PDP filter 200 may be spaced apart from or contacted with the front substrate 610 of the display panel 600, as shown in FIG. 4A, and the display panel 600 and the PDP filter 200 may also be disposed in contact with each other. The front substrate 610 and the adhesive or adhesive 690 may be combined as shown in FIG. 4B to prevent side effects such as inflow of foreign matters or to reinforce the strength of the PDP filter 200 itself.

The external light shielding layer 230 is formed in the PDP filter 200 to prevent external environment light from entering the display panel 600. The external environmental light is mainly absorbed by the external light shielding layer 230, thereby preventing external environmental light from passing back through the front substrate 610. Therefore, the contrast ratio of the PDP apparatus can be improved under the bright room conditions.

The pitch P2 of the external light shielding pattern 236 is preferably smaller than the pitch P1 of the discharge cells 660 (or pixels) formed in the display panel 600. That is, by disposing a plurality of external light shielding patterns 236 in one discharge cell 660, the panel light can be uniformly dispersed, and the external environment light can be efficiently absorbed.

Moire fringes may be generated by the periodic pattern of the discharge cells 660 of the display panel 600 and the periodic pattern of the external light shielding pattern 236 of the external light shielding layer 230. In order to prevent such moiré patterns, the pitch P2 of the external light shielding pattern 236 is preferably about 70-110 μm. Here, the pixel pitch P2 of the display panel 600 may be about 0.5 to 2.5 mm.

As described above, the external light shielding layer 230 in which the external light shielding pattern 236 has a wedge-shaped black stripe shape has been described. However, the present invention is not limited thereto, and various examples illustrated in FIGS. 5A to 5H are provided. The external light shielding layer in which the external light shielding pattern of the shape was formed can be used. 5A to 5H are perspective views illustrating modified examples of the external light shielding layer of the present invention.

As shown in FIGS. 5A to 5E, the external light shielding layers 430a, 430b, 430c, 430d, and 430e may be externalized by using various shapes of external light shielding patterns 436a, 436b, 436c, 436d, and 436e. By absorbing ambient light to prevent external environment light from entering the display panel and reflecting the panel light from the display panel toward the viewer, a high transmittance to visible light and a high contrast ratio can be obtained. The external light shielding pattern may include a wedge-black matrix type external light shielding pattern 436a of FIG. 5A, a wedge-black wave type external light shielding pattern 436b of FIG. 5B, The flat-black stripe type external light shielding pattern 436c of FIG. 5C, the flat-black matrix type external light shielding pattern 436d of FIG. 5D, and the flat-black stripe type external light shielding pattern 436d of FIG. 5E. For example, a flat-black wave type external light shielding pattern 436e may be used. In order to prevent moiré, the external light shielding patterns 436a, 436b, 436c, 436d, and 436e may be formed at a bias angle α of about 1.5 to 80 degrees with respect to the long side of the substrate 234.

In addition, the external light shielding layers 430f, 430g, and 430h illustrated in FIGS. 5F to 5H block external ambient light and efficiently focus and transmit panel light from the display panel toward the viewer, thereby providing high transmittance to visible light. And high contrast ratio.

Specifically, the external light shielding layer 430f illustrated in FIG. 5F includes a substrate 234 and a plurality of semi-cylindrical lenticular lenses 510 formed on one surface of the substrate 234 facing the display panel to focus the panel light. And a flat-black striped external light shielding pattern 436c formed on the other surface of the substrate 234 to block external environmental light. The external light shielding layer 430g illustrated in FIG. 5G includes a substrate 234, a plurality of hemispherical lenticular lenses 512 formed on one surface of the substrate 234 facing the display panel, and focusing the panel light; A flat-black matrix external light shielding pattern 436d is formed on the other surface of the substrate 234 to block external ambient light. The external light shielding layer 430h illustrated in FIG. 5H includes a substrate 234, a plurality of elliptical bead lenses 514 formed on one surface of the substrate 234 to focus panel light, and a substrate. An external light shielding pattern 524 fills between the 234 and the bead lens 514 and blocks external ambient light.

Here, the external light shielding pattern 524 of FIG. 5H is made of the same material as the external light shielding pattern 236 of FIG. 2, and performs the same function, and the external light shielding pattern 524 is also periodically periodically arranged by the bead lens 514. Will have a pattern. The lenticular lenses 510 and 512 and the bead lens 514 may be 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 a transparent resin, and may include neon light and / or a near infrared absorbent.

Therefore, in order to prevent the moiré phenomenon caused by the periodic pattern of the discharge cells 660 of the display panel 600 and the periodic patterns of the external light shielding layers 430f, 430g, and 430h, the external light shielding patterns 436c, 436d, and 524 are described. The bias angle α of about 1.5 to 80 degrees with respect to the long side of 234.

For convenience of description, the present invention will be described using an outer light shielding pattern 236 having a wedge-shaped black stripe shape.

In general, when two or more periodic patterns overlap, an interference fringe such as a moire fringe may occur. Referring to FIG. 6, a PDP filter capable of preventing a moiré phenomenon that may occur between an external light shielding layer and an electromagnetic shielding layer may be used. Explain in detail. FIG. 6 is an exploded perspective view of an external light shielding layer and an electromagnetic shielding layer separately disposed in the PDP filter of FIG. 2. Hereinafter, a wedge-shaped black stripe is used as the external light shielding pattern and a conductive mesh film having a periodic pattern is formed as the electromagnetic shielding layer as an example.

As described above, when the pitch of pixels periodically disposed on the display panel is about 0.5 to 2.5 mm, and the pitch of the external light shielding pattern 236 is about 0.07 to 0.11 mm, the bias angle of the external light shielding pattern 236 is The moiré phenomenon between the pixel and the external light shielding pattern 236 was not seen at about 1.5-80 degrees.

As shown in FIG. 6, the electromagnetic shielding layer 220 is also inclined at a predetermined bias angle β to prevent moiré between the electromagnetic shielding layer 220 and the external light shielding layer 230 of the conductive mesh layer type. It is preferable. Here, the bias angle β refers to the intersection angle between the extension line of the mesh and the long side of the substrate 234 (that is, the long side of the display panel). Preferably, when the bias angle difference β-α between the electromagnetic shielding layer 220 and the external light shielding layer 230 is 5 to 40 degrees or 50 to 75 degrees, the moiré phenomenon may be prevented. Furthermore, when the bias angle difference β-α is 5 to 15 degrees or 55 to 65 degrees, the moiré phenomenon can be more effectively prevented.

For example, Table 5 below shows the degree to which the moiré phenomenon occurs according to the change of the bias angle β of the electromagnetic shielding layer 220. Here, when the pixel pitch of the display panel is about 0.5 to 2.5 mm, the pitch of the mesh is about 0.25 to 0.35 mm, and the bias angle α of the external light shielding pattern 236 is 5 degrees, the bias angle β is 0. Five sample groups set at -9 degrees, 10-45 degrees, 46-54 degrees, 55-80 degrees, and 81-90 degrees were used to indicate whether the moiré pattern was visually recognized.

As shown in Table 5, it can be seen that the presence or absence of moiré patterns is determined by changing the bias angle β of the electromagnetic shielding layer 220. That is, when the bias angle β of the electromagnetic shielding layer 220 is 10 to 45 degrees or 55 to 80 degrees, the moiré phenomenon may be effectively prevented. Since the bias angle α of the external light shielding pattern 236 is 5 degrees, the bias angle difference β-α between the electromagnetic wave shielding layer 220 and the external light shielding layer 230 is 5-40 degrees or 50-75. It can be seen that the moire phenomenon can be prevented in the case of a degree.

FIG. 7A is a cross-sectional view illustrating a PDP filter according to a third embodiment of the present invention, and FIG. 7B is a cross-sectional view illustrating a PDP device using the PDP filter of FIG. 7A.

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 FIGS. 7A and 7B, the PDP filter according to the present embodiment has a basically identical structure except for the following with the previous embodiment.

That is, as shown in FIGS. 7A and 7B, the PDP filter 700 includes a diffusion layer 710 for preventing moire fringes and Newton rings. When periodic patterns such as the external light shielding pattern 236 of the external light shielding layer 230 or the mesh pattern of the electromagnetic shielding layer 220 are reflected on the front substrate 610 of the display panel 600, The moiré phenomenon may occur due to mutual interference between patterns, or the Newtoning phenomenon may occur when the separation distance between the PDP filter 700 and the front substrate 610 of the display panel 600 coupled thereto is uneven. In this case, the diffusion layer 710 diffuses the pattern by the reflected light so that interference between the original pattern and the pattern due to the reflected light does not occur, thereby preventing the moiré phenomenon and the Newton ring phenomenon. The diffusion layer 710 is preferably formed on one surface of the PDP filter 700 close to the display panel 600, but may be disposed at any position within the PDP filter 700 as long as it can prevent moire fringes and Newton rings. have. That is, the diffusion layer 710 may be formed on the surface facing the viewer of the PDP filter 700, that is, on the anti-reflection layer 250.

The diffusion layer 710 consists of a film having an anti-glare surface. The anti-glare treatment here comprises a fine concavo-convex structure on the surface of the film using suitable methods such as, for example, a rough surfacing treatment method by sandblasting or embossing, and a transparent fine particle compounding method. Forming process. As such transparent fine particles, inorganic fine particles which may have conductivity, including, for example, silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide, and the like, and cross-linked or non-crosslinked polymers Like organic type microparticles | fine-particles containing, transparent microparticles | fine-particles whose average particle diameter is 0.1-50 micrometers can be used.

8 is an exploded perspective view showing a PDP apparatus according to a fourth 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. 8, the PDP filter according to the present embodiment has a basically identical structure except for the following with the previous embodiment.

That is, as shown in FIG. 8, instead of forming the diffusion layer 710 on the PDP filter 200 to prevent the moiré phenomenon and the Newton ring phenomenon, the front substrate 610 of the display panel 600 is described above. -Can handle glare. In other words, the diffuse reflection surface 611 of the front substrate 610 facing the PDP filter 200 is an anti-glare surface, and the reflection phenomenon is suppressed by the diffuse reflection so that the reflected light from the front substrate 610 does not have a constant pattern. Therefore, the moiré phenomenon and the Newton ring phenomenon can be prevented. In addition, the PDP filter including the diffusion layer described in the previous embodiment may also be applied to the PDP apparatus of the present embodiment.

The PDP filter and the PDP device have been described as an example for convenience of explanation, but the present invention is not limited thereto, and the display device to which the filter for display device of the present invention is applied has a PDP that implements RGB with pixels. Devices, OLED devices, LCD devices or FED devices.

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 PDP filter according to a first embodiment of the present invention.

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

3 is a perspective view illustrating an external light shielding layer used in the PDP filter of FIG. 2.

4A is an exploded perspective view illustrating a PDP apparatus including the PDP filter of FIG. 2.

4B is a cross-sectional view taken along line BB ′ of FIG. 4A.

5A to 5H are perspective views illustrating modified examples of the external light shielding layer of the present invention.

FIG. 6 is an exploded perspective view of an external light shielding layer and an electromagnetic shielding layer separately disposed in the PDP filter of FIG. 2.

7A is a cross-sectional view illustrating a PDP filter according to a third embodiment of the present invention.

FIG. 7B is a cross-sectional view of a PDP apparatus using the PDP filter of FIG. 7A.

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

(Explanation of symbols for the main parts of the drawing)

100: PDP device 110: case

120: driving circuit board 130: display panel

140: PDP filter 150: cover

200: PDP filter 210: transparent substrate

220: electromagnetic shielding layer 230: external light shielding layer

232: support 234: substrate

236: external light shielding pattern 240: color correction layer

250: antireflection layer 270: filter base

310: panel light 320: external ambient light

430a, 430b, 430c, 430d, 430e, 430f, 430g, 430h: external light shielding layer

436a, 436b, 436c, 436d, 436e, 430f, 430g, 430h: exterior light shielding pattern

510: semi-cylindrical lenticular lens 512: hemispherical lenticular lens

514: bead lens 524: external light shielding pattern

600: display panel 610: front substrate

611: diffuse reflection surface 615: sustain electrode

620: bus electrode 625: dielectric layer

630: dielectric protective film 635: back substrate

640: address electrode 645: dielectric layer

650: partition 655: phosphor layer

655R: red phosphor layer 655G: green phosphor layer

655B: blue phosphor layer 660: discharge cell

690: adhesive or adhesive 700: PDP filter

710: diffusion layer 900: PDP filter

690: adhesive or adhesive

Claims (22)

A filter for a display device mounted on the front of the display panel, An external light shielding layer having an external light shielding pattern formed thereon; And a CIE color coordinate of the front surface of the filter for the display device under a D65 light source, wherein 60? L *? 80, -2.0? A *? 2.0, and -2.0? B *? 2.0. delete delete The method of claim 1, And a bias angle? Formed between the advancing direction of the external light shielding pattern and the long side of the filter for the display device is 1.5 to 80 degrees. The method of claim 1, The external light shielding pattern may be a wedge-black stripe shape, a wedge-black matrix shape, a wedge-black wave shape, a flat-black stripe shape, a flat-black matrix shape, or a flat-black wave shape. filter. The method of claim 1, The external light shielding layer includes a semicylindrical lenticular lens, a hemispherical lenticular lens, or a bead lens disposed between the external light shielding patterns to collect and emit light from the display panel. The method of claim 1, The external light shielding pattern is a filter for a display device, characterized in that the light absorbing material is filled. The method of claim 7, wherein The external light shielding pattern is a filter for a display device, characterized in that the conductive material is filled. The method of claim 1, The filter for display device has a conductive mesh layer, An angle difference between a bias angle β formed by an extension line of the mesh of the conductive mesh layer and a long side of the filter for a display device, and a bias angle α between a traveling direction of the external light shielding pattern and a long side of the filter for a display device ( β-α) is a filter for a display device, characterized in that 5 to 40 or 50 to 74 degrees. The method of claim 1, And a diffusion layer formed on one surface of the display panel facing the display panel. The method of claim 10, And said diffusion layer has an anti-glare surface. The method of claim 1, The display device filter is a display device filter, characterized in that the lowest transmittance of 10 to 40% of the light of the wavelength of 550 nm to 600 nm. The method of claim 1, The display device filter may include a first pigment that absorbs light of a wavelength of 380 to 480 nm, a second pigment that absorbs light of a wavelength of 450 to 550 nm, and a third pigment that absorbs light of a wavelength of 560 to 620 nm. A filter for display device, characterized in that it comprises. The method of claim 1, The display device filter includes a color correction layer, The color correction layer includes a first pigment that absorbs light in a wavelength of 380 to 480 nm, a second pigment that absorbs light in a wavelength of 450 to 550 nm, and a third pigment that absorbs light in a wavelength of 560 to 620 nm. A filter for display device, characterized in that. The method of claim 14, The color correction layer includes a polymer resin, wherein the first and third pigments each include 0.01 to 1 wt% of the polymer resin, and the second pigment contains 0.01 to 2 wt% of the polymer resin. Filter for a display device, characterized in that. The method of claim 14, The filter for display device includes a transparent substrate, The color correction layer is a filter for a display device, characterized in that located in front of the transparent substrate. The method of claim 16, The filter for display device includes an electromagnetic shielding layer, The electromagnetic shielding layer is positioned between the color correction layer and the transparent substrate, or a filter for a display device, characterized in that located behind the transparent substrate. delete delete The method of claim 1, A filter for display device, characterized in that the filter is for a PDP device. A display device comprising the filter for display device according to any one of claims 1, 4 to 17 and 20. delete

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