KR20080023087A - Filter for display panel - Google Patents

Abstract

A display panel filter is provided to improve a light room contrast and to reduce a Moire effect by forming effectively a black image. A display panel filter includes a transparent substrate, a first base part(110), a first pattern part, and a second pattern part. The first base part is formed at the transparent substrate. The first pattern part is formed at the first base part. The second pattern part is formed at the transparent substrate and is composed of a metal material. A width of a lower end of the first pattern part is larger than a width of an upper end of the first pattern part. The upper end of the first pattern part is arranged near to the external light in comparison with the lower end of the first pattern part. The width of the first pattern part corresponds to 1.2 to 3.5 of the width of the second pattern part. The width of the lower end of the first pattern part corresponds to 0.2 to 0.5 of a width of an electrode formed at a display panel.

Description

Filter for display panel

1 is a perspective view showing an embodiment of a structure of a plasma display panel;

2 illustrates an embodiment of an electrode arrangement of a plasma display panel;

FIG. 3 illustrates an embodiment of a method in which a frame of an image is time-divided and driven into a plurality of subfields in the plasma display apparatus.

4a to 4c is a view showing an embodiment of the structure of the external light blocking sheet provided in the filter according to the present invention,

5 is a cross-sectional view of the external light shielding sheet for explaining the relationship between the thickness of the external light blocking sheet and the height of the pattern portion.

6A-7B illustrate embodiments of a filter structure comprising a plurality of sheets;

8a to 8b is a front view shown to explain the relationship between the external light shielding sheet and the EMI shielding layer according to the present invention,

9 illustrates an embodiment of a structure of a plasma display device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter disposed on a front surface of a display panel, and in particular, by manufacturing an external light shielding sheet to block external light incident from the outside of the panel and placing the sheet on the front of the panel, thereby providing a clear contrast of the panel. The present invention relates to a filter capable of improving moiety and preventing moiré.

In general, a plasma display panel (hereinafter referred to as a PDP) generates a discharge by applying a predetermined voltage to electrodes installed in a discharge space, and the plasma generated during gas discharge excites a phosphor, thereby causing an image including a character or graphic. As a device for displaying a display device, it is easy to increase in size, light weight, and planar thickness, and provides a wide viewing angle in up, down, left, and right, and realizes full color and high brightness.

When a black image is implemented, since the black light is reflected from the front of the panel of the PDP due to the white phosphor exposed on the bottom panel of the PDP, the black image is recognized as a light dark color. There is a problem that the clear room contrast of the PDP is lowered.

The present invention has been made to improve the above-described problems of the prior art, a filter that effectively blocks the external light incident on the panel to prevent reflection of light, and improve the clear room contrast and brightness of the plasma display panel The purpose is to provide.

A filter according to the present invention for solving the above technical problem is a transparent substrate; A first base part formed on the transparent substrate; A first pattern portion formed on the first base portion; And a second pattern portion of a metal material formed on the transparent substrate, wherein a lower width of the first pattern portion is greater than an upper width, and an upper end of the first pattern portion is disposed closer to external light than the lower end, and the first pattern portion is disposed on the transparent substrate. The width of the pattern portion is 1.2 to 3.5 times the width of the second pattern portion. The width of the lower end of the first pattern portion may be 0.2 to 0.5 times the width of the electrode formed on the display panel.

Another filter according to the present invention for solving the above technical problem, the width of the bottom of the first pattern portion is characterized in that the width of the partition wall formed in the display panel is 0.3 times to 0.8 times.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

1 is a perspective view illustrating an embodiment of a plasma display panel. Referring to FIG. 1, the plasma display panel includes a scan electrode 11 and a sustain electrode 12, which are sustain electrode pairs formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

Each of the sustain electrode pairs 11 and 12 is typically a transparent electrode 11a or 12a formed of indium tin oxide (ITO), a metal such as silver (Ag), chromium (Cr), or chromium / copper. And the bus electrodes 11b and 12b, which may be formed in a stack of / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). At this time, the bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to reduce the voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a and 12a and the bus electrodes 11b and 12b are stacked, but also without the transparent electrodes 11a 12a. It may consist of only the electrodes 11b and 12b. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 12b absorbs external light generated from the outside of the upper substrate 10 to reduce reflection. A black matrix (BM) is formed that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10. The first black matrix 15 and the transparent electrodes 11a and 12a are formed at positions overlapping the partition wall 21. And second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be simultaneously formed to be physically connected. .

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are physically separated.

An upper dielectric layer 13 and a protective layer 14 are stacked on the upper substrate 10 on which the scan electrode 11 and the sustain electrode 12 are formed, respectively, and charged particles, which generate plasma, are accumulated on the upper dielectric layer 13. . The protective layer 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed on the lower substrate 20 in a direction crossing the scan electrode 11 and the sustain electrode 12, and the lower dielectric layer 24 is formed on the lower substrate 20 on which the address electrode 22 is formed. ) And the partition wall 21 is formed.

In addition, phosphors 23 are applied to the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 is composed of a vertical partition wall 21a formed in a direction parallel to the address electrode 22 and a horizontal partition wall 21b formed in a direction crossing the address electrode 22, and physically distinguishes discharge cells. The ultraviolet rays and the visible light generated by the discharge can be prevented from leaking to the adjacent discharge cells.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a differential barrier rib structure having different heights of the vertical bulkhead 21a and the horizontal bulkhead 21b, and a channel having a channel usable as an exhaust passage in at least one of the vertical bulkhead 21a and the horizontal bulkhead 21b. A grooved partition structure in which a groove is formed in at least one of the type partition structure, the vertical partition wall 21a or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

On the other hand, in one embodiment of the invention is shown and described that each of the R, G and B discharge cells are arranged on the same line, it may also be arranged in other formation. For example, a delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible, and the shape of the discharge cell may be not only square but also various polygonal shapes such as pentagon and hexagon.

2 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display panel.

Referring to FIG. 2, the plurality of discharge cells constituting the plasma display panel may be arranged in a matrix form. The plurality of discharge cells are provided at the intersections of the scan electrodes Y1 to Ym, the sustain electrodes Z1 to Zm, and the address electrodes X1 to Xn, respectively. The scan electrodes Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrodes Z1 to Zm may be driven simultaneously. The address electrodes X1 to Xn may be driven by being divided into odd-numbered and even-numbered electrodes or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma display panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 2. For example, a dual scan method in which two scan electrodes of the scan electrodes Y1 to Ym are simultaneously scanned is possible, and the address electrodes X1 to Xn are divided up and down at the center of the panel. It may be driven.

FIG. 3 is a diagram illustrating an embodiment of a method in which a frame of an image is time-divided and driven into a plurality of subfields in the plasma display apparatus.

Referring to FIG. 3, referring to FIG. 3, a unit frame may be time-divisionally driven to a predetermined number, for example, eight subfields SF1,..., SF8 to express the gray level of an image. Each subfield SF1, ..., SF8 is divided into a reset section (not shown), an address section (A1, ..., A8), and a sustain section (S1, ..., S8). do.

In each address section A1, ..., A8, a data signal is applied to the address electrode X, and corresponding scan pulses are sequentially applied to each scan electrode Y. FIG. Sustain pulses are alternately applied to the scan electrode Y and the sustain electrode Z in each of the sustain periods S1, ..., S8, so that the discharge cells selected in the address periods A1, ..., A8 are alternately applied. Cause sustain discharge.

The luminance of the plasma display panel is proportional to the number of sustain discharges in the sustain periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gray levels, each subfield in turn has different sustain pulses at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of can be assigned. Alternatively, in order to obtain luminance of 133 gray levels, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

Meanwhile, the number of sustain discharges allocated to each subfield may be variably determined according to the weights of the subfields. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, the plasma display panel may be driven by dividing one frame into eight or more subfields or the like, such as 12 or 16 subfields.

4A to 4C are cross-sectional views illustrating an exemplary embodiment of an external light blocking sheet structure provided in a filter according to the present invention. The external light blocking sheet 100 includes a base part 110 and a pattern part 120. It is done by

The base unit 110 is preferably made of a transparent plastic material, for example, a resin-based material formed by an ultraviolet (UV) curing method so that light can be transmitted smoothly, and enhances the effect of protecting the front surface of the panel. For this purpose, a solid glass material may be used.

Referring to FIG. 4A, the pattern portion 120 of the external light shielding sheet 100 may have a triangular shape, and more preferably, may have an isosceles triangle shape. The pattern portion 120 is formed of a material darker than the base portion 110, for example, the pattern portion 120 is formed of a carbon-based material, or by applying a black dye to the outer surface of the pattern portion By forming, it is possible to increase the effect that the external light is absorbed by the outer peripheral surface of the pattern portion 120.

In FIGS. 4A to 4C, the lower end 120a of the pattern portion provided in the external light blocking sheet 100 is disposed at the panel side B, and the upper end 120b of the pattern portion provided in the external light blocking sheet 100 is external. It is preferable to arrange | position toward the observer side in which light is incident. Since the external light source is generally located on the upper side of the panel, the external light will be incident on the panel at an angle from the upper side. In order to absorb and block such external light and totally reflect the visible light emitted from the panel to increase the reflectance of the panel light, the refractive index of the pattern part 120, and the refractive index of the inclined surface that is at least part of the pattern part 120 may be the base part 110. It is preferable to have a refractive index smaller than), and in order to maximize absorption of external light and total reflection of panel light in consideration of the angle of external light incident on the panel, the refractive index of the pattern part 120 is 0.300 times to 0.999 of the refractive index of the base part 110. It is preferable to be a ship.

In addition, when the thickness T of the external light shielding sheet 100 is 20 μm to 250 μm, the manufacturing process may be facilitated and may have a light transmittance suitable for transmitting visible light. In addition, the light emitted from the panel to be smoothly transmitted, the light incident from the outside is refracted to be effectively absorbed and blocked by the pattern portion 120 and the thickness (T) of the external light shielding sheet in order to secure the firmness of the sheet It can be formed to 100㎛ to 180㎛.

In addition, the bottom width P1 of the pattern portion 120 may be formed to 18㎛ to 35㎛, in which case it is possible to ensure the aperture ratio for the light emitted from the panel to be smoothly emitted to the user side, the external light You can block as much as possible. Here, the lower end 120a of the pattern portion 120 may be defined as a portion disposed on the panel side B of the outer circumferential surface of the pattern portion.

The height h of the pattern portion 120 is formed to be 80 μm to 170 μm to form an inclined surface slope that can effectively absorb external light and reflect the panel light in relation to the bottom width P1. The short circuit of the part 120 can be prevented, and the height h of the pattern part 120 is defined as the longest distance from the bottom to the top of the pattern part.

The panel light is sufficiently emitted to the user side to secure an aperture ratio for displaying a display image having an appropriate brightness, and adjacent to each other in order to secure an inclination surface 120c of an optimal pattern portion for increasing external light blocking effect and panel light reflection efficiency. The shortest distance P3 between the two pattern parts may be 40 μm to 90 μm, and the distance P4 between the upper ends of the pattern parts adjacent to each other may be 60 μm to 130 μm. Here, the shortest distance D1 between two pattern parts adjacent to each other is substantially the same as the shortest distance between lower ends of each of the two pattern parts adjacent to each other.

For the same reason as above, when the shortest distance P3 between two adjacent pattern portions is two to five times the width P1 of the lower portion of the pattern portion, the aperture ratio for the display is secured while the external light blocking effect and the panel light are at the same time. The reflection efficiency can be increased.

In addition, when the height h of the pattern portion 120 has a range between 0.89 times and 4.25 times the distance between two adjacent pattern portions, that is, the shortest distance P3, the external light incident at an angle from the upper side to the panel is maximized. When the height h of the pattern portion 120 is formed too high, it is possible to prevent insulation breakage of the pattern portion that may be generated, thereby optimizing the reflection efficiency of the panel light.

In addition, when the interval P4 between the upper ends of two adjacent pattern parts is 1 to 3.25 times the interval P3 between the lower ends of two pattern parts adjacent to each other, an aperture ratio for displaying an image having an appropriate luminance may be secured. The light generated from the panel may be totally reflected at the inclined surface of the pattern part 510 to reach the observer.

Referring to FIG. 4B, the inclined surface 120c on both sides of the outer circumferential surface may have a curved shape. In this case, the inclined surface of the pattern portion 120 may receive external light incident on the pattern portion 120. In order to be absorbed and blocked by the furnace may be formed in the form of a curved curve inside the pattern portion.

Referring to FIG. 4C, the pattern portion 120 may have a trapezoidal shape. In this case, the width P2 of the upper end of the pattern part may be smaller than the width P1 of the lower end. In addition, the width P2 of the upper portion of the pattern portion 120 may be formed to be 5 μm or less, and according to the relationship with the lower width P1 of the pattern portion 120, external light absorption and total reflection of the panel light may be performed. A pattern portion having an inclined surface having an inclination that can be effectively formed may be formed. In addition, the pattern unit 120 may be formed in left and right asymmetrical shapes. That is, the areas according to the left and right inclined surfaces of the outer surface of the pattern unit 120 may be different, or the angles formed by the left and right inclined surfaces may be different from each other. In addition, the upper end of the outer peripheral surface of the pattern portion 120 may have a curved shape having a predetermined curvature.

5 is a cross-sectional view showing an embodiment of the structure of the external light shielding sheet according to the present invention to illustrate the thickness of the external light blocking sheet and the height of the pattern portion.

Referring to FIG. 5, the thickness T of the external light blocking sheet is 100 μm to 180 μm to secure the robustness of the external light blocking sheet including the pattern portion and to secure the transmittance of visible light emitted from the panel for displaying an image. Is preferably.

When the height h of the pattern portion provided in the external light shielding sheet is 80 μm to 170 μm, the pattern part is most easily manufactured, and an appropriate opening ratio of the external light blocking sheet can be ensured, and the external light blocking effect and the light emitted from the panel The reflection effect of the light can be maximized.

The height h of the pattern portion may vary depending on the thickness T of the external light shielding sheet. In general, external light incident on the panel and affecting bright room contrast is mainly located above the position of the panel. Therefore, in order to effectively block the incident external light, the height h of the pattern portion preferably has a value within a predetermined ratio range with respect to the thickness T of the external light shielding sheet.

Referring to FIG. 5, as the height h of the pattern portion increases, the thickness of the base portion of the upper portion of the pattern portion becomes thinner, which may cause insulation breakdown or short circuit, and as the height h of the pattern portion decreases, the incident portion has an angle within a predetermined range. External light may be incident on the panel so that external light may not be blocked.

Table 1 below shows the results of experiments on the breakdown of the external light blocking sheet and the external light blocking effect according to the thickness (T) of the external light blocking sheet and the height (h) of the pattern part.

Sheet thickness (T) Pattern part  Height (h) Dielectric breakdown Outer light  block 120 μm 120 μm ○ ○ 120 μm 115 ㎛ △ ○ 120 μm 110 ㎛ X ○ 120 μm 105㎛ X ○ 120 μm 100 μm X ○ 120 μm  95 ㎛ X ○ 120 μm  90 μm X ○ 120 μm  85 μm X ○ 120 μm  80㎛ X ○ 120 μm  75 μm X △ 120 μm  70 ㎛ X △ 120 μm  65 μm X △ 120 μm  60㎛ X △ 120 μm  55 μm X △ 120 μm  50 μm X X

Referring to Table 1, when the thickness T of the external light shielding sheet is 120 μm, when the height h of the pattern part is formed to be 120 μm or more, there is a risk that the pattern part is insulated and destroyed, thereby increasing the defective rate of the product. If the height h of the pattern portion is formed to be 115 μm or less, there is no fear that the pattern portion will be insulated and broken, thereby reducing the defective rate of the external light shielding sheet. However, when the height of the pattern portion is formed to be 75 μm or less, the efficiency of blocking external light by the pattern portion may be reduced, and when formed to 50 μm or less, external light may be incident on the panel.

Therefore, when the thickness T of the external light shielding sheet is 1.01 times to 2.25 times the height of the pattern portion, insulation breakdown of the upper portion of the pattern portion can be prevented, and external light can be prevented from entering the panel. In addition, in order to prevent dielectric breakdown and external light incident on the panel, and to increase the amount of reflection of light emitted from the panel and to secure a viewing angle, the thickness T of the external light blocking sheet is 1.01 times to 1.50 times the height of the pattern portion. Can be.

Since the plasma display panel has a lattice structure, moiré may occur. Moiré phenomenon is a low frequency pattern that occurs when a similar lattice pattern overlaps, for example, there is a wave pattern seen when the mosquito nets are stacked.

Table 2 below shows the results of experiments on whether moiré occurred and external light blocking effects according to the ratio of the width P1 of the pattern portion of the external light blocking sheet to the width of the bus electrodes formed on the upper substrate of the panel. This is the case of 90 micrometers.

Bottom width of pattern part / Bus electrode width Moire Exterior light blocking 0.10 △ × 0.15 △ × 0.20 × △ 0.25 × ○ 0.30 × ○ 0.35 × ○ 0.40 × ○ 0.45 △ ○ 0.50 △ ○ 0.55 ○ ○ 0.60 ○ ○

Referring to Table 2, when the width P1 of the lower end of the pattern portion is 0.2 to 0.5 times the width of the bus electrode, it is possible to reduce the moiré phenomenon and reduce external light incident on the panel. In addition, in order to prevent moiré phenomenon and effectively block external light, and to secure an aperture ratio for emitting panel light, the width P1 of the lower end of the pattern portion is preferably 0.25 times to 0.4 times the width of the bus electrode.

Table 3 below shows the results of experiments on whether moiré occurred and the effect of blocking external light according to the ratio of the width P1 of the pattern portion of the external light shielding sheet to the width of the vertical bulkhead formed on the lower substrate of the panel. This is the case of 50 micrometers.

Width of pattern bottom / width of vertical bulkhead Moire Exterior light blocking 0.10 ○ × 0.15 △ × 0.20 △ × 0.25 △ × 0.30 × △ 0.35 × △ 0.40 × ○ 0.45 × ○ 0.50 × ○ 0.55 × ○ 0.60 × ○ 0.65 × ○ 0.70 △ ○ 0.75 △ ○ 0.80 △ ○ 0.85 ○ ○ 0.90 ○ ○

Referring to Table 3, when the width P1 of the lower end of the pattern portion is 0.3 to 0.8 times the width of the vertical partition wall, it is possible to reduce the moire phenomenon and at the same time reduce the external light incident on the panel. In addition, in order to prevent moiré phenomenon and effectively block external light, and to secure an aperture ratio for emitting panel light, the width P1 of the lower end of the pattern portion is preferably 0.4 times to 0.65 times the width of the vertical partition wall.

6A to 7B are sectional views showing embodiments of the structure of the filter according to the present invention. The filter formed on the front surface of the plasma display panel includes an AR / NIR sheet, an EMI shield sheet, an external light shield sheet, and an optical characteristic sheet. And the like.

6A to 7B, the AR / NIR sheet 210 has a function of reducing glare by preventing reflection of light incident from the outside on the front surface of the base sheet 213 made of a transparent plastic material. (Anti-Reflection) layer 211 is attached to the rear, shielding the near-infrared radiation emitted from the panel to the NIR (Near Infrared) shielding layer (NIR) shielding so that the signals transmitted using infrared rays, such as a remote control, can be normally transmitted ( 212) is attached. In this case, the base sheet 213 may be applied to various materials in consideration of transparency, insulation, heat resistance, mechanical strength, and the like, which can withstand the use conditions or manufacturing. For example, polyester-based resins, polyamide-based resins, polyolefin-based resins, vinyl-based resins, acrylic resins, cellulose-based resins, and the like may be used, and generally have good transparency and a polyethylene having a visible light transmittance of 80% or more. It is preferable to be formed of a polyester-based material such as telephthalate (PET), polyethylene naphthalate, etc., and the thickness of the base sheet 213 is not enough mechanical strength to prevent the sheet from being damaged, and the thickness is larger than necessary. It may be desirable to form 50 μm to 500 μm in consideration of not spending the cost.

A general anti-reflection film may be applied to the AR layer 211. The NIR shielding layer 212 has a near-infrared transmittance of 20% or less, preferably 10% or less, in a wavelength range of 800 nm to 1100 nm, which the PDP emits. It is formed using a near infrared absorbent to the extent that it can be provided. As a material of the near-infrared absorber, for example, a polymethine-based, cyanine-based compound, a butaroocyanine-based compound, a nattarocyanine-based compound, a naphthoquino-based compound, an anthraquinone-based compound, Near-infrared absorption pigments, such as a thiol type compound, an immonium type compound, and a dimonium type compound, are mentioned.

EMI shielding sheet 220 is attached to the EMI shielding layer 221 on the front of the base sheet 222 made of a transparent plastic material to shield the electromagnetic interference (EMI) to prevent the EMI emitted from the panel to be emitted to the outside . In this case, the EMI shielding layer 221 typically has a mesh-shaped pattern using a conductive material, and the EMI shielding sheet outside the pattern, that is, the image is not displayed for the grounding of the EMI shielding layer ( In the non-effective area of 220, a conductive material is applied as a whole. Here, as a material of the metal layer forming the pattern of the EMI shielding sheet, for example, gold, silver, iron, nickel, chromium, aluminum, etc., a metal having a conductivity sufficient to shield the radio waves can be used, formed of a single material It may be formed and may be formed of an alloy or a multilayer. In addition, the lower surface of the pattern is blackened to improve the clear contrast of the panel, such as a black matrix formed inside the panel. At least one of the outer circumferential surfaces of the pattern is blackened to have a darker color than the base portion. In such a case, when external light such as sunlight or electric lamp light enters the panel, reflection is suppressed and absorbed from the blackened portion, so that the display image of the PDP can be improved with high contrast. As a blackening method, a plating method is preferable, and in such a case, it is excellent in adhesiveness and all the surfaces of a pattern can be blackened easily. As the plating material, at least one selected from copper, cobalt, nickel, zinc, tin, and chromium, or two or more compounds such as oxide compounds such as copper oxide, copper dioxide, and iron oxide may be used.

It is preferable that the pattern width of the EMI shielding layer is formed to be 10 μm to 30 μm, in which case it may have a sufficient electric resistance value for electromagnetic shielding, and an opening ratio for proper light transmittance can be ensured.

Typically, the external light source is most often present in the interior or exterior of the user's head. The external light blocking sheet 230 is attached to effectively block the external light so that the black image of the PDP can be darker.

The adhesive 240 forms a layer between the AR / NIR sheet 210, the EMI shielding sheet 220, and the external light shielding sheet 230, and each sheet and filter may be firmly installed at the front of the panel. To help. In addition, it is preferable that the material of the base sheet included in each sheet is substantially the same material in consideration of the ease of manufacturing the external light blocking sheet.

Meanwhile, in FIG. 6A, an AR / NIR sheet 210, an EMI shield sheet 220, and an external light shielding sheet 230 are stacked in this order. However, as illustrated in FIG. 6B, the AR / NIR sheet 210 is stacked. As the external light blocking sheet 230 and the EMI shielding sheet 220 may be stacked in this order, the stacking order of each sheet may be differently stacked by those skilled in the art. In addition, at least one layer of each sheet may be omitted.

7A to 7B, the filter 300 installed in front of the panel may include the AR / NIR sheet 310, the EMI shield sheet 330, and the external light shield sheet 340 as illustrated in FIGS. 6A and 6B. In addition to the photosensitive sheet 320 may further include. The optical sheet 320 improves the color temperature and luminance characteristics of light incident from the panel, and the optical layer 321 made of a predetermined dye and an adhesive is laminated on the front or rear of the base sheet 322 made of a transparent plastic material. do.

At least one of the basesheets included in each sheet shown in FIGS. 6A to 7B may be omitted, and any one of the basesheets may be made of hard glass, which is not made of plastic. It can improve the protection function. At this time, the glass is preferably formed spaced apart from the panel at a predetermined interval.

8A to 8B are front views illustrating the relationship between the external light shielding sheet and the EMI shielding sheet according to the present invention.

8A illustrates a front surface of the external light blocking sheet 400 according to the present invention. As illustrated, the plurality of pattern portions 420 are formed in a row on the base portion 410 with a predetermined width A1. In order to secure the transmittance of light emitted from the panel, adjacent pattern parts are formed at predetermined intervals A2. In FIG. 8A, the pattern portion 420 is formed to be substantially parallel to the lower end or the upper end of the external light shielding sheet 400, but is installed in front of the panel to prevent moiré from occurring. It may be installed in the front, it may be possible to form a pattern portion at an angle with respect to the bottom or top of the external light shielding sheet.

FIG. 8B illustrates the entire surface of the EMI shielding sheet 500. As shown in FIG. 8B, the EMI shielding layer 500 is formed of a conductive material having an electromagnetic shielding effect on the base portion 510, such as copper (Cu). It is preferable that the plurality of pattern portions 520 made of a material having a small electrical resistance be formed in a mesh shape. The pattern portion 520 of the EMI shielding sheet 500 has a width A3 of 10 μm to 30 μm, and the shortest distance A4 between adjacent pattern parts 520 is 250 μm to 300 μm. Is preferably. In such a case, the aperture ratio having a sufficient light transmittance can be ensured by the width A3 of the pattern portion 520 formed sufficiently small.

In the plasma display filter to which the external light shielding sheet 400 and the EMI shielding sheet 500 are applied simultaneously, the relationship between the width of the pattern portion of the external light shielding sheet 400 and the width of the pattern portion of the EMI shielding sheet 500 is determined by the filter. It is preferable to form at a predetermined ratio for securing the aperture ratio and the functionality of each sheet. That is, it is preferable that the pattern portion width A1 of the external light shielding sheet, which is relatively large in width, is 1.2 to 3 times larger than the pattern portion width A3 of the EMI shielding sheet. In such a case, even if each pattern portion overlaps or does not overlap, the functionality of each sheet is not degraded, and an appropriate aperture ratio for light emitted from the panel is ensured. In addition, the width of the pattern portion A1 of the external light shielding sheet is EMI shielded in consideration of the appropriate aperture ratio for the light emitted from the panel and the ease of manufacturing according to the alignment of the external light shielding sheet and the EMI shielding sheet. It may be 1.5 to 2.3 times the pattern portion width A3 of the sheet.

For the above reason, the distance A4 between the adjacent pattern portions of the EMI shielding sheet 500, which is relatively large in aperture ratio, is equal to 4 of the distance A2 between the adjacent pattern portions of the external light shielding sheet 400. It is preferable to be 7 to 7 times, and in such a case, even if a filter to which the EMI shielding sheet and the external light shielding sheet are applied in front of the panel, the aperture ratio at which the light emitted from the panel can reach the viewer can be secured. There is a blocking effect, it is possible to improve the clear room contrast of the panel by blocking the light incident to the panel from the outside.

Referring to FIG. 9, it is preferable that a filter 100 is formed on the front surface of the plasma display panel according to the present invention, and the filter 100 includes an external light blocking sheet, an anti-replication sheet, and a near infrared (NIR). The shield sheet, the EMI (Electro Magnetic Interference) shield sheet, the optical characteristic sheet and the like may be included.

An adhesive layer or an adhesive layer may be formed between the filter 100 and the panel, and when the thickness of the adhesive layer or the adhesive layer is 10 μm to 30 μm, light incident from the outside may be effectively blocked and may be generated in the panel. It can emit light to the outside effectively. In addition, in order to protect the panel from pressure from the outside, the thickness of the adhesive layer or the adhesive layer positioned between the filter 100 and the panel may be 30㎛ to 120㎛, the filter 100 to prevent the impact A film layer having a function of shock absorption may be formed between the panel and the panel.

As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and is provided to those skilled in the art within the scope of the technical idea of the present invention. Application is possible.

Filter according to the present invention is configured as described above, by placing the external light blocking sheet that absorbs and blocks the light incident from the outside to the front of the display panel as possible to effectively implement a black (black) image to improve the contrast contrast At the same time, the moiré phenomenon can be reduced.

Claims (12)

Transparent substrate; A first base part formed on the transparent substrate; A first pattern portion formed on the first base portion; And It includes a second pattern portion of a metal material formed on the transparent substrate, The lower end width of the first pattern portion is greater than the upper end width, the upper end portion of the first pattern portion is disposed adjacent to the external light than the lower end, the width of the first pattern portion is 1.2 to 3.5 times the width of the second pattern portion. The width of the lower end of the first pattern portion is a filter, characterized in that 0.2 to 0.5 times the width of the electrode formed on the display panel. According to claim 1, The width of the lower end of the first pattern portion is a filter, characterized in that 0.25 to 0.4 times the width of the electrode formed on the display panel. The display panel of claim 1, wherein the display panel is A first electrode and a second electrode formed on the upper substrate, The width of the lower end of the first pattern portion is a filter, characterized in that 0.2 to 0.5 times the width of any one of the first and second electrodes. According to claim 1, And the thickness of the first base portion is 1.01 times to 1.5 times the height of the first pattern portion. According to claim 1, The width of the lower end of the first pattern portion is a plasma display filter, characterized in that 1 to 3.5 times the width at the intermediate height of the first pattern portion. According to claim 1, The interval between the lower end of the first pattern portion adjacent to each other is characterized in that the filter is 1.1 to 5 times the width of the lower end of the first pattern portion. According to claim 1, The first base portion has a thickness of 100um to 180um. According to claim 1, The height of the first pattern portion is a filter, characterized in that 80um to 110um. Transparent substrate; A first base part formed on the transparent substrate; A first pattern portion formed on the first base portion; And It includes a second pattern portion of a metal material formed on the transparent substrate, The lower end width of the first pattern portion is greater than the upper end width, the upper end portion of the first pattern portion is disposed adjacent to the external light than the lower end, the width of the first pattern portion is 1.2 times to 3.5 times the width of the second pattern portion, The width of the lower end of the first pattern portion is a filter, characterized in that 0.3 to 0.8 times the width of the partition wall formed in the display panel. The method of claim 9, And the thickness of the first base portion is 1.01 times to 1.5 times the height of the first pattern portion. The method of claim 9, The first base portion has a thickness of 100um to 180um. The method of claim 9, The height of the first pattern portion is a filter, characterized in that 80um to 110um.

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