JP4842392B2 - Outside light shielding layer and display device including the same - Google Patents

Description

  The present invention relates to an outside light shielding layer and a display device including the outside light shielding layer, and more particularly to an outside light shielding layer capable of improving a contrast ratio in a bright room and preventing a moiré phenomenon. It is related with the display apparatus containing.

  With the advancement of information technology in the modern society, parts and devices related to photoelectronics have remarkably advanced and become popular. Among them, display devices that display images are widely used for television and personal computer monitor devices. In addition, the display device is becoming thinner and thinner.

  In general, a plasma display panel (hereinafter referred to as a PDP) apparatus is a pioneering display apparatus that can simultaneously satisfy an increase in size and thickness as compared to a CRT (Cathode Ray Tube) that represents an existing display apparatus. Have been bathed. Such a PDP device displays an image using a gas discharge phenomenon, and has various display capabilities such as display capacity, luminance, contrast ratio, afterimage, and viewing angle. In addition, the PDP device is easier to increase in size than other display devices, and is evaluated as having a characteristic optimal for future high-quality digital televisions as a thin light-emitting display device. Furthermore, it has been attracting attention as a display device that can replace CRT.

  In the PDP device, a discharge is generated from a gas between electrodes by a direct current or an alternating voltage applied to the electrodes, and phosphors are excited by emission of ultraviolet light accompanying the discharge, thereby emitting light.

  However, due to the characteristics of driving the PDP device, not only the amount of electromagnetic waves and near-infrared emission is large and the surface reflection of the phosphor is high, but also the orange light emitted from helium (He) and xenon (Xe) which are encapsulated gases. There is a disadvantage that the color purity does not reach the cathode ray tube.

  Therefore, the electromagnetic waves and near infrared rays generated from the PDP device may adversely affect the human body, and may cause malfunctions in precision devices such as wireless telephones and remote controllers. In order to use such a PDP device, it is required to suppress the emission of electromagnetic waves and near infrared rays emitted from the PDP device to a predetermined value or less. Therefore, in order to shield electromagnetic waves and near infrared rays and reduce reflected light to improve color purity, a PDP filter having functions such as electromagnetic wave shielding, near infrared ray shielding, optical surface reflection prevention and / or color purity improvement is provided. Adopted.

  Such a PDP device includes a panel assembly including discharge cells in which a gas discharge phenomenon occurs, and a PDP filter that shields electromagnetic waves and near infrared rays. Since the PDP filter is mounted on the front surface of the panel assembly, it must also have transparency.

  In such a PDP device according to the prior art, under the condition that the outside is bright, that is, in a bright room condition, external ambient light may pass through the PDP filter and flow into the panel assembly. In such a case, polymerization occurs between incident light generated in the discharge cells in the panel assembly and external ambient light that has flowed in through the PDP filter from the outside. As a result, the contrast ratio is reduced under bright room conditions, and the screen display capability of the PDP device is deteriorated.

  In the case of the PDP device according to the related art, a moiré phenomenon occurs due to the periodic pattern interference between the pixels constituting the PDP device and the PDP filter, and the screen display capability of the PDP device is reduced.

  The present invention has been devised to solve the above problems, and provides an external light shielding layer for a display filter that can improve the contrast ratio in a bright room condition and prevent the moire phenomenon. The purpose is to do.

  Another object of the present invention is to provide a display device that includes the external light shielding layer and does not cause a moire phenomenon.

  The external light shielding layer for a display filter according to one aspect of the present invention includes a transparent resin base material and a light shielding pattern formed on one surface of the base material so as to be spaced apart from each other at a constant period. The bias angle (α) formed by the traveling direction of the light shielding pattern and the long side of the substrate is 5 ° or less.

  A display filter according to one aspect of the present invention includes a filter base and an external light shielding layer for the display filter. The external light shielding layer includes a light shielding pattern formed on one surface of the base material so as to be spaced apart from each other at a constant period. The bias angle (α) formed by the traveling direction of the light shielding pattern and the long side of the substrate is 5 ° or less.

  A display device according to one aspect of the present invention includes a panel assembly including a plurality of light-emitting cells that are divided into a light-emitting region and a non-light-emitting region that is a peripheral portion of the light-emitting region when viewed from the viewer side, and the panel And a display filter having an external light shielding layer disposed on the assembly and having a light shielding pattern formed on one side thereof. In the display device, an area of the light emitting region is 60% or more of an entire area of the light emitting cell, and a bias angle formed by a traveling direction of the light shielding pattern and a long side of the panel assembly is 5 ° or less. And

  However, those skilled in the art will understand that there are practically difficult aspects in implementing a display device having a perfect 100% light emission ratio at present.

  The bias angle is preferably 1.5 to 4 °.

  The panel assembly includes a front substrate, a rear substrate facing the front substrate, and a barrier rib formed between the front substrate and the rear substrate to form a plurality of discharge spaces.

  The panel assembly may include a plurality of electrodes that cause surface discharge on a side surface of the discharge space.

  Specifically, the panel assembly includes a transparent front substrate, a rear substrate disposed in parallel with the front substrate, and an upper partition that is disposed between the front substrate and the rear substrate to partition the discharge space. A first discharge electrode and a second discharge electrode disposed in the upper partition so as to surround the discharge space, a lower partition disposed between the upper partition and the rear substrate, and in the discharge space The phosphor layer may be disposed, and a discharge gas injected into the discharge space. The upper and lower barrier ribs may have a lattice shape.

  A black stripe is formed on any one of the front substrate and the rear substrate, and the black stripe can act as an element of the non-light emitting region. That is, the non-light emitting region corresponds to the partition wall or the black stripe. A transparent electrode pattern may be formed on the front substrate for discharging. The transparent electrode pattern is made of an opaque metal to prevent signal delay of the transparent electrode pattern, and passes through the light emitting region so as to be parallel to one surface of the light emitting region when viewed from above. A pattern can further be included.

  The bus electrode pattern is spaced from the surface of the light emitting region parallel to the bus electrode pattern by a predetermined distance H1 when viewed from above, and the H1 satisfies the following formula.

  H1 ≦ 0.3 × L1

  L1 is the length of the other surface connected to one surface of the light emitting region parallel to the bus electrode pattern.

  The external light shielding layer includes a base material made of a transparent resin material and a light shielding pattern formed on one surface of the base material so as to be spaced apart from each other at a constant period.

  The light shielding pattern may have various shapes such as 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.

  The display filter may be spaced apart from one side of the panel assembly and may be joined by an adhesive.

  As described above, a display device such as a PDP device according to the present invention employs an external light shielding layer having a light shielding pattern inclined at a predetermined bias angle with respect to the long side of the panel assembly, thereby providing the display. In addition to improving the bright room contrast ratio of the device, it is possible to prevent the moire phenomenon and improve the display quality of the display device.

  In addition, the display filter including the external light shielding layer according to the present invention is applied to a panel assembly having a predetermined effective light emitting area ratio, and can specifically shield the moire phenomenon.

  In addition, the external light shielding layer according to the present invention can be effectively employed to prevent moiré of a PDP panel having a structure in which surface discharge is performed on the side surface of the discharge space.

1 is an exploded perspective view schematically showing a PDP device according to an embodiment of the present invention. It is sectional drawing which showed the PDP filter which concerns on one Embodiment of this invention. FIG. 3 is a perspective view showing an external light shielding layer applied to the PDP filter of FIG. 2. 1 is a plan view conceptually showing a light emitting cell of a PDP panel assembly according to an embodiment of the present invention. 1 is a perspective view illustrating a PDP panel assembly according to an embodiment of the present invention. 6 is a plan view conceptually showing a light emitting cell of the PDP panel assembly of FIG. FIG. 6 is an exploded perspective view illustrating a PDP panel assembly according to another embodiment of the present invention. It is sectional drawing cut | disconnected along the I-I 'line | wire of FIG.

  Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the accompanying drawings. Specifically, in this embodiment, a PDP device will be described. Therefore, a PDP filter is used as the display filter of the present invention.

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

  Referring to FIG. 1, a PDP apparatus 100 according to an embodiment of the present invention includes a cover 150 covering an upper part of a case 110, a drive circuit board 120 accommodated in the case 110, and a light emitting cell in which a gas discharge phenomenon occurs. The panel assembly 130 includes a PDP filter 140. The PDP filter 140 includes a conductive layer formed of a material having excellent conductivity on a transparent substrate, and the conductive layer is grounded to the case 110 via the cover 150. That is, before the electromagnetic wave generated from the panel assembly 130 strikes the viewer, the electromagnetic wave is transferred to the cover 150 and the case 110 through the conductive layer of the PDP filter 140.

  Hereinafter, the PDP filter will be described in detail.

  FIG. 2 is a cross-sectional view showing a PDP filter according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating an external light shielding layer applied to the PDP filter of FIG.

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

  Here, the filter base 270 is formed by randomly laminating the transparent substrate 210, the antireflection layer 250, and the electromagnetic wave shielding layer 220. Hereinafter, in an embodiment of the present invention, the layers corresponding to the electromagnetic wave shielding function and the antireflection function will be described separately, but the present invention is not limited to this. That is, the filter base 270 according to an embodiment of the present invention may be configured with one or more layers, and each layer may have an electromagnetic wave shielding function, an antireflection function, or a combination of these functions. . The filter base 270 may have all of the electromagnetic wave shielding function, the antireflection function, or a combination of these functions, or may have only one of them.

  An external light shielding layer 230 is disposed on one surface of the filter base 270. The external light shielding layer 230 is disposed on the surface of the filter base 270 on the panel assembly side, that is, the surface opposite to the viewer side when the PDP filter 200 is mounted on the PDP device. The external light shielding layer 230 may be disposed on the other surface of the filter base 270 without being limited thereto.

  The external light shielding layer 230 shields the support 232, the base 234 formed on one surface of the support 232, and the external environmental light 320 that is formed in the base 234 and flows into the panel assembly from the outside. Pattern 236. In the present embodiment, the light shielding pattern 236 includes a large number of wedge-shaped black stripes spaced apart from each other at regular intervals. In the present embodiment, the bottom surface of the wedge-shaped black stripe is formed on the base material toward the panel assembly side.

  Here, the base material 234 on which the light shielding pattern 236 is formed may be directly formed on the filter base 270. However, as shown in FIG. 2, after the base material 234 is formed on the support 232, the base material 234 is coupled to the filter base 270. You may do it. The support 232 supports the substrate 234 on which the light shielding pattern 236 is formed. In the embodiment shown in FIG. 2, one surface of the base 234 and the filter base 270 is bonded through the support 232, but the present invention is not limited to this. That is, since the support body 232 has a purpose of supporting the base material 234, when the external light shielding layer 230 is disposed on the other surface of the filter base 270, the base material 234 and the filter base 270 are directly coupled. You can also.

  In one embodiment of the present invention, the support 232 is preferably a transparent resin film having ultraviolet transparency. Examples of the material of the support 232 include polyethylene terephthalate (PET), polycarbonate (Poly Carbonate: PC), and polyvinyl chloride (PVC). Of course, as the support 232, a film having a filter specific function, such as an antireflection layer 250, a color correction layer 240, or an electromagnetic wave shielding layer 220, can also be used.

  The light shielding pattern 236 has a wedge-shaped cross section, and a large number of black stripe patterns are formed on one surface of a base material 234 facing a panel assembly (not shown) so as to be spaced apart from each other. It plays a role of preventing the flow into the assembly.

  The substrate 234 is formed of an ultraviolet curable resin, and the light shielding pattern 236 is formed of a black organic material, an inorganic material, a metal, or the like that can absorb light. In particular, in the case of metal, since the electrical conductivity is high, that is, the electrical resistance is low, when the light shielding pattern 236 is formed by adding metal powder, the electrical resistance can be adjusted by the concentration of the metal powder. The light shielding pattern 236 can perform an electromagnetic wave shielding function. Furthermore, when the surface is treated with black or black metal is used, the external light shielding function and the electromagnetic wave shielding function can be efficiently realized. Further, the light-shielding pattern 236 can be made of an ultraviolet curable resin containing carbon.

  The light shielding pattern 236 of the present invention includes a roll molding method, a hot press method using a thermoplastic resin, and a thermoplastic or thermosetting resin placed in a substrate 234 on which a shape opposite to the light shielding pattern 236 is transferred. It can be formed by an injection molding method for filling and molding. Further, when the ultraviolet curable resin constituting the base material 234 has an antireflection function, an electromagnetic wave shielding function, a color adjustment function, or a combination of these functions, the external light shielding layer 230 is additionally provided as described above. It can also perform functions.

  The light shielding pattern 236 constituting the external light shielding layer 230 prevents external light 320 from flowing into the panel assembly and totally reflects incident light 310 from the panel assembly toward the viewer. Therefore, a high transmittance for visible light and a high contrast ratio can be obtained.

  The PDP device preferably has a high transmittance for visible light and a high contrast ratio. Here, the contrast ratio can be expressed as the following formula 1.

In order to increase the transmittance of the PDP device, when the light emitted from the panel assembly is passed through without being filtered by the PDP filter, not only the brightness of white light but also the brightness of black light is increased. Therefore, when the brightness of the PDP device is increased, the overall contrast ratio is relatively lowered. In the case of a PDP device according to the prior art, a PD using a PDP filter including a color correction film including a black pigment is used.
Instead of reducing the transmittance of the P filter to some extent, a method of increasing the contrast ratio is adopted. In the case of such a conventional PDP apparatus, a contrast ratio of about 120: 1 is obtained.

  The PDP filter 200 of the present invention uses a light shielding pattern 236 that absorbs light instead of using a color correction film containing a black pigment. Here, the light shielding pattern 236 serves to increase the contrast ratio by partially absorbing the incident light 310 emitted from the panel assembly and lowering the luminance of white light and black light by a predetermined part. Also, according to Equation 1, the contrast ratio is a function of the brightness of the reflected light, but the reflected light includes light reflected after the external ambient light 320 flows into the panel assembly. Here, even if the external ambient light 320 is directly absorbed by the light shielding pattern 236 or reflected in the panel assembly, it is absorbed again by the light shielding pattern 236, so that the brightness of the reflected light can be lowered. Therefore, even if the same reflected light is generated for the black light and the white light, the “brightness of the reflected light” located in the denominator of Equation 1 is lowered, so that the contrast ratio can be increased.

  When the ratio of the area occupied by the bottom surface of the light shielding pattern 236 to one surface of the substrate 234 is 20 to 50%, the maximum contrast ratio can be obtained while minimizing transmission loss. More preferably, a better effect can be obtained when the ratio of the area occupied by the bottom surface of the light shielding pattern 236 to one surface of the substrate 234 is 25 to 35%. In the case of the PDP device using the PDP filter 200 including the external light shielding layer 230, a contrast ratio of 250: 1 or more can be obtained in a state where the transmittance for visible light is maintained at 40% or more.

  On the other hand, the external light shielding layer 230 itself has a transmittance of 60% or more in the visible light wavelength band. Incident light 310 from the panel assembly is incident on the external light shielding layer 230 in a substantially vertical direction, and a part of the incident light 310 is absorbed by the light shielding pattern 236, but most of the incident light 310 is the base material. Since the light passes through 234 and passes through, the transmittance of the PDP device is increased.

  Referring to FIG. 2 again, the filter base 270 has a structure in which an electromagnetic wave 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 laminated. . However, the present invention is not limited to such a stacking order, and the filter base 270 may have a structure in which the transparent substrate 210, the antireflection layer 250, or the electromagnetic wave shielding layer 220 are stacked randomly.

  Here, the transparent substrate 210 is generally manufactured using a transparent plastic material such as glass or acrylic. However, depending on the specifications of the filter base 270, the transparent substrate 210 may be excluded.

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

  As the transparent substrate 210 made of an organic polymer molded product, acrylic or polycarbonate is generally used, but the present invention is not limited to such an embodiment. The transparent substrate 210 preferably has high transparency and heat resistance, and a polymer molded product and a laminate of the polymer molded product can also be used as the transparent substrate 210. With respect to the transparency of the transparent substrate 210, it is preferable that the visible light transmittance is 80% or more, and for heat resistance, it is preferable that the glass transition temperature is 50 degrees or more. The polymer molding may be transparent in the visible wavelength region. Specific examples of this type include polyethylene terephthalate (PET), polysulfone (PS), polyethersulfone (PES), polystyrene, polyethylene naphthalate, poly Examples include arylate, polyetheretherketone (PEEK), polycarbonate (PC), polypropylene (PP), polyimide, triacetylcellulose (TAC), polymethylmethacrylate (PMMA), and the like. Absent. Among them, polyethylene terephthalate (PET) is preferable in terms of price, heat resistance, and transparency.

  In order to shield electromagnetic waves, it is necessary to cover the display surface with a highly conductive object. As the electromagnetic wave shielding layer 220 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 film transparent thin film are laminated can be used. In one embodiment of the present invention, the electromagnetic wave shielding layer 220 is formed on one surface of the transparent substrate 210, that is, the surface on the panel assembly side, but the present invention is not limited to such an arrangement.

  Here, as the conductive mesh film, a metal mesh coated on a grounded metal mesh or a synthetic resin or metal fiber mesh is generally used. As an example of the metal material 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.

  As the multilayer conductive film, a highly refractive transparent thin film typified by ITO (Indium Tin Oxide) can be used for shielding electromagnetic waves. Examples of the multilayer transparent conductive film include a multilayer thin film in which metal thin films such as gold, silver, copper, platinum, and palladium and high refractive transparent thin films such as indium oxide, stannic oxide, and zinc oxide are alternately stacked.

  The metal thin film is a thin film layer made of silver (Ag) or an alloy containing silver. Among them, silver is preferably used because it has excellent conductivity, infrared reflectivity, and visible light transmittance when multilayered. However, since silver has low chemical and physical safety and deteriorates due to environmental pollutants, water vapor, heat, light, etc., silver is not suitable for surrounding environments such as gold, platinum, palladium, copper, indium, tin, etc. An alloy containing one or more kinds of stable metals is also preferably used.

  The high refractive index transparent thin film layer is transparent to visible light, and has an effect of preventing visible light from being reflected by the metal thin film due to a difference in refractive index from the metal thin film. Specific materials for forming such a high refractive index transparent thin film include oxides such as indium, titanium, zirconium, bismuth, tin, zinc, antimony, tantalum, cerium, neodymium, lanthanum, thorium, magnesium, and potassium. A mixture of these oxides or zinc sulfide can be used.

  Although not shown, the filter base 270 according to an embodiment of the present invention may include a near infrared shielding layer separately. The near-infrared shielding layer serves to shield strong near-infrared rays that are generated from the panel assembly and cause malfunction of electronic devices such as a radio telephone and a remote controller.

  In one embodiment of the present invention, when a multilayer transparent conductive film in which a metal thin film and a high refractive index transparent thin film are laminated is used as the electromagnetic wave shielding layer 220, the multilayer transparent conductive film has an effect of shielding near infrared rays. Therefore, in this case, two functions of shielding near infrared rays and electromagnetic waves can be performed only by the electromagnetic wave shielding layer 220 without separately forming the near infrared shielding layer. Of course, in this case as well, a near-infrared shielding layer to be described later can be formed separately.

  In one embodiment of the present invention, when a conductive mesh film is used as the electromagnetic wave shielding layer 220, a near-infrared absorbing dye that absorbs wavelengths in the near-infrared region is included to shield near-infrared rays emitted from the panel assembly. High polymer resin can be used. For example, organic dyes having various components such as cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, diimonium, and nickel-dithiol can be used as the near infrared absorbing dye. Since the PDP device emits strong near infrared rays over a wide wavelength region, it is necessary to use a near infrared shielding layer that can absorb near infrared rays over a wide wavelength region.

  In an embodiment of the present invention, when a transparent conductive film is used as the electromagnetic wave shielding layer 220, the electromagnetic wave shielding function may be lower than when a conductive mesh film is used, but a metal powder is added to the light shielding pattern 236. If the electromagnetic wave shielding function is complemented or enhanced, a sufficient electromagnetic wave shielding function can be realized even with a transparent conductive film.

  The antireflection 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 such a stacking order. Preferably, as shown in FIG. 2, the antireflection layer 250 is formed on a surface on the viewer side when the PDP filter 200 is mounted on the PDP device, that is, a surface opposite to the panel assembly side. Is efficient. Such an antireflection layer 250 can reduce reflection of external light and improve visibility.

  Of course, by forming the antireflection layer 250 on the surface of the peripheral surface of the PDP filter 200 on the panel assembly side, reflection of external light from the PDP filter 200 can be further reduced. Further, by forming the antireflection layer 250 to reduce reflection of external light from the PDP filter 200, the visible light transmittance from the panel assembly can be improved and the contrast ratio can be increased.

  Referring to FIG. 2 again, the PDP filter 200 according to an embodiment of the present invention may further include a color correction layer 240. The color correction layer 240 can change or calibrate the color balance by reducing or adjusting the amount of red (R), green (G), and blue (B).

  The reason why the orange color is strongly emitted from the panel assembly is that the light emitted from the plasma itself and the external environment light re-reflected by the panel assembly tends to have an orange color. The PDP filter 200 according to the embodiment of the present invention fundamentally reduces the amount of the orange incident light 310 by forming the external light shielding layer 230 to shield the external ambient light 320 from flowing into the panel assembly. Can be reduced to. Therefore, the PDP filter 200 of the present invention can improve the color purity without additionally reducing or using the amount of the dye for correcting the orange color. For example, in a bright room (150 lux), RGB hues are displayed in halftones (50 IRE), color coordinates are obtained with a measuring instrument for each hue, and the area of the unique hue and the measured color coordinates are calculated. If the area ratio is obtained, the area ratio of 86% is obtained when measured through the PDP filter 200 as compared to the area ratio of 66% when directly measured by the panel assembly, and the color ratio is high. You can know that purity is obtained.

  The color correction layer 240 uses various pigments in order to increase the color reproduction range of the display and improve the sharpness of the screen. As such a pigment, a dye or a pigment can be used. Examples of the dye include organic dyes having a neon light shielding function such as anthraquinone, cyanine, azo, styryl, 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 of the dye, the absorption coefficient, and the transmission characteristics required for the display, they are not limited to specific numerical values.

  When adhering each layer or film of the present invention, a transparent adhesive or adhesive can be used. Specific materials include acrylic adhesive, silicone adhesive, urethane adhesive, polyvinyl butyral adhesive (PMB), ethylene-vinyl acetate adhesive (EVA), polyvinyl ether, saturated amorphous polyester, melamine Examples thereof include resins.

  Moire fringes may occur due to the periodic pattern (light emitting cell structure, electrode pattern, etc.) of the panel assembly and the periodic pattern of the light shielding pattern 236 of the external light shielding layer 230. The moire fringe means an interference fringe generated when two or more periodic patterns overlap. In order to shield the moire fringes due to the interference phenomenon between the discharge cell and the external light shielding layer, as shown in FIG. 3, the extended line of the light shielding pattern 236 and the long side of the base material 234 have a predetermined angle α. It is arranged so that it has a cross. Here, in order to effectively shield the moire fringes, a bias angle (bias angle: α) defined as an intersection angle formed by the extended line of the light shielding pattern 236 and the long side of the substrate 234 is set to the structure of the panel assembly. The effective value is changed by. In order to prevent moiré of the panel assembly of the present invention, which will be described later, the bias angle must be 5 ° or less, and preferably within a range of 1.5 to 4 °. The bias angle may be understood as an intersection angle of the light shielding pattern 236 with respect to the long side of the panel assembly (lateral direction with respect to the viewer).

  As described above, when the light shielding pattern 236 has a predetermined bias angle (5 ° or less), the moire of the PDP apparatus is hardly affected by various patterns of the panel assembly and the pitch of the light shielding pattern 236. The phenomenon can be effectively shielded.

  Hereinafter, the panel assembly according to the present invention will be described in detail. In particular, the panel assembly described below has a feature in which prevention of moire phenomenon due to the bias angle is effectively applied.

  The panel assembly according to the present invention includes a plurality of light emitting cells. The light emitting cell is an area formed between the front substrate and the rear substrate of the panel assembly. The light emitting cell is divided into a light emitting region that emits light when viewed from the viewer side and a non-light emitting region that is a peripheral portion of the light emitting region. In the present invention, the light emitting region is not a concept that completely coincides with a discharge space, which is a space where discharge gas is discharged.

  In other words, the discharge space can be diversified according to a lattice shape, but the light emitting cell is a concept as one optical unit pixel. In contrast, the discharge space is diversified according to the shape of the barrier ribs of the panel assembly, for example, the stripe-shaped barrier ribs, the lattice-shaped barrier ribs, and the like.

  FIG. 4 is a plan view conceptually showing a light emitting cell of the panel assembly according to the embodiment of the present invention. The light emitting cell shown in FIG. 4 shows a planar state when viewed from the viewer side.

  Referring to FIG. 4, the light emitting cell 40 is divided into a light emitting region 42 and a non-light emitting region 44. The light emitting cells 40 are continuously formed adjacent to each other. 4 may not be on the same layer. That is, FIG. 4 is a diagram showing a state of the light emitting cell 40 observed from the viewer side.

  The light emitting area 42 may be a red light emitting area, a green light emitting area, and a blue light emitting area, respectively. The three light emitting regions that express different hues can form a group and function as a color pixel that can implement various colors.

  When the non-light emitting region 44 is a panel assembly having a grid-like partition wall, it may be a region corresponding to a part of the partition wall. On the other hand, in the case of a panel assembly having stripe-shaped partition walls, the non-light emitting region 44 may be a region corresponding to a part of the partition walls or a region corresponding to a part of the black stripe formed on the front substrate. That is, the non-light emitting area 44 is a portion displayed in black when viewed from the viewer side. For example, in the case of a panel assembly having stripe-shaped partition walls, the vertical non-light-emitting regions 44a in FIG. 4 are partition walls, and the horizontal non-light-emitting regions 44b are light-shielding patterns (black stripes) formed on the front substrate. Or

  In the case of the panel assembly according to the present invention, the area of the light emitting region 42 is 60 to 98.9% of the entire area of the light emitting cell 40. The area ratio of the light emitting region 42 to the entire area of the light emitting cell 40 is theoretical, but includes a case where the effective light emitting area has a ratio of 100%. That is, as the area ratio increases, the portion that looks black decreases, and conversely, the effective light emitting area decreases as the area ratio decreases.

  In the case of the PDP device including the panel assembly having the above-described area ratio and the above-described external light shielding layer having a bias angle of 5 ° or less, the bright room contrast ratio is excellent and the moire phenomenon does not occur. . That is, if the area ratio is less than 60%, a moire phenomenon may occur even in the case of an external light shielding layer having a bias angle of 5 ° or less, and on the contrary, the area ratio range is satisfied. Even if the bias angle exceeds 5 °, moire phenomenon may occur.

  Although the present embodiment has been described mainly with respect to the PDP device, the external light shielding layer of the present invention is applicable to a general display device in which the light emitting region is 60% or more of the entire area of the light emitting cell even if it is not a PDP device. can do. That is, those skilled in the art will be able to easily apply the external light shielding layer according to the present invention to prevent moiré in liquid crystal display devices and the like.

  FIG. 5 is an exploded perspective view illustrating a PDP panel assembly according to an embodiment of the present invention.

  A PDP panel assembly 500 according to the present embodiment is an AC type three-electrode surface discharge plasma display panel, and the PDP panel assembly 500 includes a front substrate 520 and a rear substrate 530.

  The back substrate 530 includes an address electrode 533 for generating an address discharge, a back dielectric layer 535 in which the address electrode is buried, a partition wall 537 for partitioning a discharge space, and a back surface on which both sides of the partition wall and the partition wall are not formed. A phosphor layer 539 applied to the substrate is formed. In this embodiment, the partition 537 has a stripe shape.

  The front substrate 520 spaced apart from and opposed to the back substrate 530 includes common and scan electrodes 522 and 523 that generate sustain discharges, and a front dielectric layer 525 in which the common and scan electrodes 522 and 523 are embedded. A protective layer 529 is provided.

  The common electrode 522 includes a transparent common electrode 522a and a bus common electrode 522b disposed on one side of the transparent common electrode. The scan electrode 523 includes a bus scan electrode 523b disposed on one side of the transparent scan electrode 523a.

  In this embodiment, the partition wall 537 extends in the vertical direction of the panel assembly 500 with respect to a viewer, and the common and scanning electrodes 522 and 523 are patterned to extend perpendicular to the partition wall 537. Therefore, the above-described external light shielding layer has an emission surface of the panel assembly 500 such that the bias angle of the light shielding pattern is 5 ° or less with respect to the common and scanning electrode extension directions, that is, the lateral direction of the panel assembly 500. Placed on top.

  6 is a plan view conceptually showing a light emitting cell of the PDP panel assembly of FIG. That is, FIG. 6 is a diagram showing a state when the panel assembly of FIG. 5 is viewed from the viewer side.

  As shown in FIG. 6, a plurality of light emitting cells 60 are included. The light emitting cell 60 is divided into a light emitting region 62 and a non-light emitting region 64. In FIG. 6, the bus common electrode 522b and the bus scanning electrode 523b of the front substrate 520 are shown in black. Since the bus electrodes 522b and 523b are made of an opaque metal and cannot transmit light, they are shown black when viewed from the viewer side.

  As described above, the area of the light emitting region 62 of the PDP panel assembly 500 according to the present embodiment has an area of 60% or more as compared with the area of the entire light emitting cell 60, and thus the predetermined bias angle (5) described above. An external light shielding layer having an angle of less than or equal to (°) is effectively applied to the panel assembly, and the occurrence of moire phenomenon can be effectively shielded. However, the external light shielding layer having the bias angle is applied to other display devices that are out of the area ratio of the light emitting region 62, although it has an effective difference, and performs a moire suppressing function of a predetermined level or more. be able to.

  However, the moiré prevention effect through the application of the external light shielding layer is more specifically applied to the display device in which the area ratio of the light emitting region 62 is at least 60% or more as described above. Can be shown.

  Further, the bus electrodes 522b and 523b are disposed close to the light emitting region surface 62a adjacent to the position parallel to the bus electrodes 522b and 523b. Specifically, the separation distance H1 between the bus electrodes 522b and 523b and the adjacent light emitting region surface 62a (non-light emitting region) is the length of the light emitting region surface 62b orthogonal to the extending direction of the bus electrodes 522b and 523b. It can arrange | position so that it may become within 30% of L1.

  In other words, when the arrangement of the bus electrodes is a panel assembly that satisfies the following formula 2, the moire phenomenon can be efficiently shielded through the application of the external light shielding layer according to the present invention.

[Equation 2]
H1 ≦ 0.3 × L1

  If described at an angle different from the above, H1 is a distance between the bus electrode and a non-light emitting region (light emitting region surface) parallel to the bus electrode, and L1 is a light emitting region surface orthogonal to the non-light emitting region. Is the length of

  The PDP panel assembly having the arrangement relationship of the bus electrodes 522b and 523b does not cause the moire phenomenon through the application of the external light shielding layer having the light shielding pattern having the predetermined angle described above.

  FIG. 7 is an exploded perspective view illustrating a PDP panel assembly according to another embodiment of the present invention. FIG. 8 is a cross-sectional view taken along the line I-I ′ of FIG. 7.

  FIG. 7 shows another embodiment of a PDP panel assembly 700 that causes surface discharge on the side of the discharge space. The external light shielding layer having a light shielding pattern having a predetermined bias angle (5 ° or less) according to the present invention is applied to the PDP panel assembly 700 according to the present embodiment, and can more effectively prevent the moire phenomenon. .

  Referring to FIGS. 7 and 8, a PDP panel assembly 700 according to the present embodiment includes a front substrate 720 and a rear substrate 730, and the front substrate 720 and the rear substrate 730 are spaced apart from each other. An upper partition 727 is formed on the front substrate 720. The upper barrier rib 727 is disposed in the non-discharge portion to partition the discharge space. An upper discharge electrode 722 and a lower discharge electrode 723 are formed in the upper partition 727 so as to surround the light emitting region. In this case, the upper discharge electrode 722 means an electrode disposed on the upper side of the lower discharge electrode 723. In the present embodiment, since the barrier ribs 727 have a lattice shape, the discharge space is understood as a concept corresponding to a light emitting region.

  A lower partition 737 is formed between the upper partition 727 and the rear substrate 730, and the lower partition 737 prevents crosstalk of charged particles. A phosphor layer 739 is disposed in a space defined by the lower partition 737. A discharge gas exists in the discharge space.

  Here, one of the upper discharge electrode 722 and the lower discharge electrode 723 can serve as an address electrode, and the other can serve as a discharge electrode to generate a discharge.

  7 and 8, the upper discharge electrode 722 and the lower discharge electrode 723 extend in one direction parallel to each other and do not face the upper discharge electrode 722 and the lower discharge electrode 723. An address electrode 733 extended as described above may be further provided. In this case, a side surface of the upper partition 727 is covered with an MgO film 729, the address electrode 733 is disposed between the back substrate 130 and the phosphor layer 739, and the address electrode 733 and the phosphor layer 739 are disposed. A dielectric layer 735 is preferably formed therebetween.

  One example of such a PDP structure will be described in more detail. A back substrate 730, an address electrode 733 disposed on the back substrate and extending in one direction, and a dielectric layer covering the address electrode 735, a lower partition wall 737 formed above the dielectric layer and defining the discharge space C, a lower discharge electrode 723 extending around the upper side of the discharge space so as to intersect the address electrode, An upper discharge electrode 722 surrounding the upper side of the discharge space and extending horizontally with the scan electrode; an upper barrier rib 727 covering the upper discharge electrode and the lower discharge electrode; The phosphor layer 739 disposed on the dielectric layer on which the barrier ribs are not disposed, the discharge gas existing in the light emitting cell, and the front substrate 7 disposed on the upper barrier rib so as to be parallel to the rear substrate. 0 and a.

  The back substrate 730 supports the address electrodes 733, the dielectric layer 735, and the like, and is usually made of a material mainly composed of glass.

  The address electrode 733 is used to cause an address discharge for facilitating the sustain discharge between the lower discharge electrode 723 and the upper discharge electrode 722. More specifically, the sustain discharge is started. It serves to lower the voltage.

  When the address electrode 733 is formed on the back substrate 730, the upper discharge electrode may be a scan electrode and the lower discharge electrode may be a common electrode. However, it is more preferable that the upper discharge electrode 722 is a common electrode and the lower discharge electrode 723 is a scan electrode. This is because the scan electrode is preferably disposed below the common electrode in order for the address discharge between the scan electrode and the address electrode 733 to occur smoothly. Therefore, for convenience of explanation, the upper discharge electrode 722 is referred to as a common electrode and the lower discharge electrode 723 is referred to as a scan electrode.

  In the present embodiment, the scanning electrode 723 and the common electrode 722 are disposed so as to surround the upper side of the discharge space C. The upper side of the discharge space means a portion higher than the lower partition 737.

  The scan electrode 723 and the common electrode 722 may be disposed to cross each other. However, when the address electrode 733 is formed on the rear substrate, the scan electrode 723 and the common electrode 722 are preferably disposed in parallel to each other.

  In FIG. 7, the scanning electrode 723 and the common electrode 722 are each formed as one electrode. However, unlike this, the scanning electrode and the common electrode can each include two or more sub-electrodes.

  The address discharge is a discharge that occurs between the scan electrode 723 and the address electrode 733. When the address discharge is completed, positive ions are accumulated on the scan electrode 723 side, and electrons are accumulated on the common electrode 722 side. Is done. Thereby, the sustain discharge between the scan electrode and the common electrode becomes easier.

The dielectric layer 735 is formed as a dielectric material that can induce charges while preventing cations or electrons from colliding with the address electrode 733 and damaging the address electrode when discharging. Examples of such a dielectric include PbO, B ₂ O ₃ , and SiO ₂ .

  The lower barrier rib 737 prevents an erroneous discharge from occurring between the discharge spaces C corresponding to one of the red light emitting subpixel, the green light emitting subpixel, and the blue light emitting subpixel constituting the unit pixel. In FIG. 7, the lower barrier ribs 737 are shown as partitioning the discharge space in a matrix form, but the present invention is not limited to this, and can be partitioned in other forms like a honeycomb. In FIG. 7, the discharge space C defined by the lower barrier rib 737 is shown as having a quadrangular cross section. However, the present invention is not limited to this, and a polygon such as a triangle or a pentagon, It is formed to be formed in a circular shape or an oval shape.

  The scan electrode 723 and the common electrode 722 are electrodes for sustain discharge, and a sustain discharge for realizing a PDP image occurs between the electrodes. The scan electrode 723 and the common electrode 722 are formed of a conductive metal such as aluminum or copper. That the common electrode 722 extends in parallel with the scan electrode 723 means that the common electrode is disposed together with the scan electrode at a predetermined interval.

  The upper barrier rib 727 partitions the adjacent discharge space C, and is formed in a dielectric to prevent the scan electrode 723 and the common electrode 722 from being directly energized during the sustain discharge, so that charged particles are emitted from the electrodes 722 and 723. It prevents the damage of these by directly colliding with each other, and induces charged particles to accumulate wall charges.

  In the case of the PDP panel assembly according to the present embodiment, since the scanning electrodes and the common electrode are all disposed inside the partition wall, there is an advantage that the effective light emitting area is substantially increased as compared with the PDP panel assembly of FIG. Moreover, the PDP panel assembly according to this embodiment described above can effectively shield the moire phenomenon by employing the external light shielding layer according to the present invention.

  Hereinafter, in order to confirm whether or not the moire phenomenon occurs due to the ratio of the area of the light emitting region to the area of the light emitting cell (effective light emitting area), a PDP apparatus including two types of panels having different effective light emitting area ratios is used. The result of observing whether or not moire occurs will be described.

  First, it was confirmed whether or not the moire phenomenon occurred in a 42-inch PDP apparatus (each having an A-type module and a B-type module) having the respective panel specifications shown in Table 1 below.

  As shown in Table 1, the ratio of the effective light emitting area was about 59% in the case of the A type module panel, and about 75% in the case of the B type module panel.

  As a result of observing the occurrence of moire phenomenon in each of the PDP devices adopting the bias angle (5 ° or less) of the external light shielding layer according to the present invention, in the case of a PDP device employing an A-type module, the bias Although there was a slight difference depending on the angle, moire phenomenon occurred in all cases under a bias angle of 5 ° or less. On the other hand, no moire phenomenon was observed in the case of the panel of the B-type module.

  As a result of simulation, it was predicted that the moire phenomenon was not observed when the ratio of the effective light emitting area was at least 60% or more.

  Next, it was confirmed whether or not the moire phenomenon occurred in a 50 inch PDP apparatus (each of which is an A type module and a B type module) having the respective panel specifications shown in Table 2 below.

  Similar to the case of 40 inches, as shown in Table 2, the ratio of the effective light emitting area in the case of the panel of the A type module was about 59%, and in the case of the panel of the B type module, it was about 75%. .

  As a result of observing the occurrence of moire phenomenon in each of the PDP devices adopting the bias angle (5 ° or less) of the external light shielding layer according to the present invention, in the case of a PDP device employing an A-type module, the bias Although there was a slight difference depending on the angle, moire phenomenon occurred in all cases under a bias angle of 5 ° or less. On the other hand, no moire phenomenon was observed in the case of the panel of the B-type module.

  As a result of the simulation, it was predicted that even in the case of a 50-inch PDP device, the moire phenomenon is not observed when the effective light emitting area ratio is at least 60% or more.

  Hereinafter, a description will be given of a result of confirming whether or not moiré is generated by a variable such as the position of the bus electrode and the thickness of the black stripe in the PDP apparatus including the PDP panel assembly of FIG.

  First, whether or not moire was generated was examined while changing the angle of the external light shielding layer provided with the light shielding pattern made of wedge-shaped black stripes having a constant spacing from each other. The spacing between the black stripes was 73.4 μm, and the area ratio of the wedge-shaped bottom surface was 30.0% with respect to the entire surface of the external light shielding layer. The size of the light emitting cell of the applied PDP panel assembly was 912 × 693 μm. The distance between the auxiliary electrode of the panel assembly and the non-light emitting region was 109 μm, and the thickness of the auxiliary electrode was 48 μm.

  As a result of the test, the moiré phenomenon hardly occurs when the bias angle of the black stripe with respect to the horizontal direction (horizontal direction) of the panel assembly is 5 ° or less, particularly 1.5 to 3.5 °. Sometimes no moire phenomenon occurred.

  Next, whether or not moiré was generated was examined while changing the angle of the external light shielding layer provided with the light shielding pattern made of wedge-shaped black stripes having a predetermined interval from each other. The spacing between the black stripes was 107.5 μm, and the area ratio of the wedge-shaped bottom surface was 30.0% with respect to the entire surface of the external light shielding layer. The size of the light emitting cell of the applied PDP panel assembly was 912 × 693 μm. The distance between the auxiliary electrode of the panel assembly and the non-light emitting region was 109 μm, and the thickness of the auxiliary electrode was 48 μm.

  As a result of the test, the moire phenomenon hardly occurs when the bias angle of the black stripe with respect to the horizontal direction (horizontal direction) of the panel assembly is 5 ° or less, particularly 2.5 to 3.5 °. Sometimes no moire phenomenon occurred.

  Finally, whether or not moire was generated was examined while changing the angle of the external light shielding layer provided with the light shielding pattern made of wedge-shaped black stripes having a predetermined interval from each other. The spacing between the black stripes was 73.4 μm, and the area ratio of the wedge-shaped bottom surface was 30.0% with respect to the entire surface of the external light shielding layer. The size of the light emitting cell of the applied PDP panel assembly was 810 × 810 μm. The distance between the auxiliary electrode of the panel assembly and the non-light emitting area was 159.5 μm, and the thickness of the auxiliary electrode was 65 μm.

  As a result of the test, the moire phenomenon hardly occurs when the bias angle of the black stripe with respect to the horizontal direction (horizontal direction) of the panel assembly is 5 ° or less, particularly 2.0 to 4.0 °. Sometimes no moire phenomenon occurred.

  As can be seen from the test results, there is a difference in the degree of moire generation depending on the spacing between the black stripes and the size of the light emitting cells, but when the bias angle is about 5.0 ° or less, the spacing between the black stripes. The moiré phenomenon can be effectively shielded without being greatly affected by the size of the light emitting cell. Furthermore, when the bias angle is about 1.5 to 4.0 °, the moire phenomenon can be prevented more effectively.

  As described above, the preferred embodiments of the present invention have been described with reference to the preferred embodiments of the present invention. However, those skilled in the relevant arts should not depart from the spirit and scope of the present invention described in the claims. Thus, it will be understood that the present invention can be variously modified and changed. In other words, the technical scope of the present invention is defined based on the claims, and is not limited by the best mode for carrying out the invention.

DESCRIPTION OF SYMBOLS 100: PDP apparatus 110: Case 120: Drive circuit board 130: Panel assembly 140: PDP filter 150: Cover 210: Transparent substrate 220: Electromagnetic wave shielding layer 230: External light shielding layer 232: Support body 234: Base material 236: Light shielding pattern 240: Color correction layer 250: Antireflection layer 270: Filter base 520: Front substrate 522a, 523a: Transparent electrode 522b, 523b: Bus electrode 525: Front dielectric layer 529: Protection layer 530: Back substrate 533: Address electrode 535: Back dielectric layer 537: barrier rib 539: phosphor layer 722: upper discharge electrode 723: lower discharge electrode 727: upper barrier rib 737: lower barrier rib

Claims (10)

A panel assembly including a plurality of light emitting cells divided into a light emitting region and a non-light emitting region which is a peripheral portion of the light emitting region when viewed from the viewer side;
A display device including a display filter disposed on the panel assembly and provided with an external light shielding layer having a light shielding pattern formed on one side thereof;
The area of the light emitting region is 60% or more of the entire area of the light emitting cell, and the bias angle formed by the traveling direction of the light shielding pattern and the long side of the panel assembly is 1.5 to 4 ° ,
The panel assembly is
A front substrate;
A back substrate facing the front substrate;
A partition walls forming a plurality of discharge spaces formed between the rear substrate and the front substrate, characterized in that it comprises a partition wall which includes a plurality of electrodes that cause surface discharge side of the discharge space Display device. Before Kipa panel assembly,
A transparent front substrate,
A rear substrate disposed parallel to the front substrate;
An upper barrier rib partitioning the discharge space is disposed between the rear substrate and the front substrate,
A first discharge electrode and a second discharge electrode disposed in the upper partition so as to surround the discharge space;
A lower partition wall disposed between the rear substrate and the upper partition wall,
A phosphor layer disposed in the discharge space;
The display apparatus according to claim 1, further comprising: a discharge gas injected into the discharge space. The display apparatus of claim 2, wherein the upper-side partition wall and the lower partition is lattice-shaped. The external light shielding layer is
A base material made of transparent resin,
The display device according to claim 1, further comprising: a light shielding pattern formed on one surface of the substrate so as to be spaced apart from each other at a constant period. The light-shielding pattern, wedge - black stripe form, a wedge-shaped - black matrix form, a wedge-shaped - black wave form, a flat - black stripe form, a flat - black matrix shape or flat - claim, characterized in that a black wave form 4 A display device according to 1. The display device according to claim 1, wherein the display filter is bonded to one side of the panel assembly with an adhesive. A panel assembly including a plurality of light emitting cells divided into a light emitting region and a non-light emitting region which is a peripheral portion of the light emitting region when viewed from the viewer side;
An external light shielding layer attached to a viewer side of the panel assembly and having a light shielding pattern formed on one side thereof,
The area of the light emitting region is 60% or more of the entire area of the light emitting cell, and the bias angle formed by the traveling direction of the light shielding pattern and the long side of the panel assembly is 1.5 to 4 ° ,
The panel assembly is
A front substrate;
A back substrate facing the front substrate;
A partition walls forming a plurality of discharge spaces formed between the rear substrate and the front substrate, characterized in that it comprises a partition wall which includes a plurality of electrodes that cause surface discharge side of the discharge space Display device. A panel assembly including a plurality of light emitting cells divided into a light emitting region and a non-light emitting region which is a peripheral portion of the light emitting region when viewed from the viewer side;
A display filter disposed on the panel assembly and provided with an external light shielding layer having a light shielding pattern formed on one side;
In a display device comprising:
The area of the light emitting region is 60% or more of the entire area of the light emitting cell, and the bias angle formed by the traveling direction of the light shielding pattern and the long side of the panel assembly is 1.5 to 4 °,
The panel assembly includes a front substrate, a rear substrate facing the front substrate, and a barrier rib formed between the front substrate and the rear substrate to form a plurality of discharge spaces.
A transparent electrode pattern is formed on the front substrate for discharging,
The transparent electrode pattern is made of an opaque metal to prevent signal delay of the transparent electrode pattern, and a bus electrode pattern that passes through the light emitting region so as to be parallel to one surface of the light emitting region when viewed from above. In addition,
The display device, wherein the bus electrode pattern is separated from a surface of a light emitting region parallel to the bus electrode pattern by a predetermined distance H1 when viewed from above, and the H1 satisfies the following formula.
H1 ≦ 0.3 × L1
(L1 is the length of the other surface connected to one surface of the light emitting region parallel to the bus electrode pattern) The display apparatus according to claim 8, wherein a black stripe is formed on any one of the front substrate and the rear substrate. The display device according to claim 9, wherein the non-light emitting region corresponds to the partition wall or the black stripe.

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