KR100704561B1 - Plasma display device - Google Patents

Abstract

The present invention relates to a plasma display apparatus, wherein the apparatus includes a filter disposed in front of the plasma display panel, and the filter is formed on the base portion and the base portion, and includes a plurality of pattern portions having a refractive index smaller than that of the base portion. To include an external light shielding sheet, the thickness of the external light blocking sheet is characterized in that 1.01 times to 2.25 times the height of the pattern portion.

According to the present invention, an external light blocking sheet that absorbs and blocks light incident from the outside as much as possible is attached to the front surface of the panel, thereby effectively realizing a black image and improving contrast.

PDP, Front Filter, Brightness, Clear Contrast, NIR, EMI

Description

Plasma Display Device

1 is a diagram illustrating 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 5 are cross-sectional views showing embodiments of the external light blocking sheet structure provided in the filter according to the present invention;

6 is a view schematically showing the front surface of the external light blocking sheet according to the present invention;

7A to 8B are cross-sectional views showing embodiments of the structure of a filter to which an external light shielding sheet is applied according to the present invention;

9 illustrates an embodiment of a structure of a plasma display device according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device for improving the clear contrast of a panel by manufacturing an external light shielding sheet for blocking external light incident from the outside of the panel and attaching it to the front surface of the panel.

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, weight, and planar thickness, provide a wide viewing angle from side to side, and realize full color and high brightness.

When a black image is realized by the PDP, external light is reflected from the front of the panel of the PDP due to the white phosphor exposed on the lower panel of the panel, thereby lowering the clear contrast of the PDP.

The present invention has been made to solve the above-described problems of the prior art, and effectively blocks external light incident on the panel to prevent reflection of light, thereby significantly improving the clear contrast of the PDP and at the same time improving the brightness of the panel. An object of the present invention is to provide a plasma display device including an external light shielding sheet.

Plasma display device according to the present invention for solving the above problems is a plasma display panel; A filter installed in front of the plasma display panel, wherein the filter includes an external light blocking sheet having a base portion and a pattern portion formed on the base portion and having a refractive index smaller than that of the base portion, and the external light blocking sheet The thickness of the pattern portion is 1.01 times to 2.25 times, or the thickness of the external light shielding sheet is characterized in that 1.01 times to 1.5 times the height of the pattern portion.

In addition, the refractive index of the pattern portion is preferably 0.300 times to 0.999 times the refractive index of the base portion, the bottom width of the pattern portion is 1 to 3.5 times the height of the middle of the pattern portion (h / 2), the pattern portion adjacent to each other Preferably, the shortest distance therebetween is 1.1 to 5 times the width of the bottom of the pattern portion, and the height of the pattern portion is 0.89 times to 4.25 times the shortest distance between the pattern portions adjacent to each other, and the interval between the upper ends of the pattern portions adjacent to each other is Characterized in that it is 1.5 to 3.5 times the shortest distance.

In addition, the filter is an anti-reflection layer for preventing the reflection of external light; A near infrared shielding layer for shielding near infrared rays emitted from the panel; And an electromagnetic wave shielding layer for shielding electromagnetic waves.

Filter according to the present invention for solving the above problems is the base portion; And an external light blocking sheet formed on the base part and having a pattern part having a refractive index smaller than that of the base part, wherein the external light blocking sheet has a thickness of 1.01 times to 2.25 times the height of the pattern part.

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

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 in 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 includes 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 to physically distinguish the discharge cells. In addition, it is possible to prevent the ultraviolet rays and the visible light generated by the discharge 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-division driven into 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. .

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 cells during subfield 1, subfield 3, and subfield 8 sections.

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 4D are cross-sectional views illustrating embodiments of an external light blocking sheet structure provided in a filter according to the present invention.

4A to 4D, the external light blocking sheet 100 includes a base part 110 and a pattern part 120.

Base portion 110 is preferably made of a transparent plastic material, for example, a resin-based material formed by UV (UV) curing method so that light can be transmitted through smoothly, to enhance the effect of protecting the front of the panel For this purpose, a solid glass material may be used.

Referring to FIG. 4A, the pattern part 120 is formed of a material of darker color than the base part 110, and is preferably made of a black material. For example, the pattern unit 120 may be formed of a carbon-based material or may apply a black dye to maximize the effect of absorbing external light.

4A to 4D, the lower end a of the external light blocking sheet is the panel side B, and the upper end b of the external light blocking sheet is provided in front of the panel to the observer side A where external light is incident. In general, since the external light source is located above the panel, external light may be incident to the panel at an angle from the upper side of the pattern portion. 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 outer peripheral surface of at least a portion of the pattern part 120 may be the base part 110. It is preferable that it is smaller than the refractive index of. In order to maximize absorption and blocking of external light incident on the panel and total reflection of the panel light, the refractive index of the pattern portion is preferably 0.300 times to 0.999 times the refractive index of the base portion.

In addition, when the thickness T of the external light shielding sheet 100 is 20 μm to 250 μm, the manufacturing process may be easy and may have an appropriate light transmittance. The light emitted from the panel is smoothly transmitted, and the light incident from the outside is refracted to be effectively absorbed and blocked by the pattern portion 120, and the thickness of the external light blocking sheet to secure the sheet (T). May be formed to 100㎛ to 180㎛.

Referring to FIG. 4A, the pattern part 120 formed on the base part 110 may have a triangular shape, and more preferably, may have an isosceles triangular shape. In addition, the bottom width P1 of the pattern portion 120 may be 18 μm to 35 μm, and in this case, an aperture ratio through which light generated from the panel may be smoothly emitted to the user side A may be ensured and external light may be obtained. The blocking efficiency can be maximized.

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. Short circuit of the part 120 can be prevented. Here, the height h of the pattern portion 120 is defined as the longest distance from the bottom to the top of the pattern portion 120 as shown in FIG. 4A.

The panel light is emitted to the user side A to secure an aperture ratio for displaying a display image with an appropriate brightness, and to increase the external light blocking effect and the panel light reflection efficiency. In order to secure the slope of the lower inclined surface, the shortest distance P3 between two adjacent pattern parts may be 40 μm to 90 μm, and the interval P4 between the upper ends of the adjacent pattern parts may be 60 μm to 130 μm. Can be. Here, the shortest distance P3 between the two pattern portions adjacent to each other is substantially the same as the shortest distance between the lower ends of each of the two pattern portions, and the spacing P4 between the upper ends of the two pattern portions adjacent to each other is substantially the two pattern portions, respectively. Is equal to the shortest distance between the top of.

For the same reason as above, when the distance between two adjacent pattern parts, that is, the shortest distance P3 is 1.1 to 5 times the width P1 of the lower end of the pattern part 120, the opening ratio for the display is secured. At the same time, the external light blocking effect and the panel light reflection efficiency can be increased.

When the height h of the pattern portion 120 has a range of 0.89 times to 4.25 times the shortest distance P3 between two adjacent pattern portions, external light incident at an angle from the upper side of the panel may not be incident on the panel. It is possible to prevent the short circuit of the pattern unit 120 and to optimize 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 panel light may be totally reflected at the inclined surface of the pattern unit 120.

Referring to FIG. 4B, the pattern portion 120 may have a trapezoidal shape in which the upper end b has a predetermined width P2, in which case the width P2 of the upper end b is the width P1 of the lower end. It is formed smaller than). In addition, the width P2 of the upper end of the pattern portion 120 may be 9 μm or less, thereby forming an inclined surface slope capable of effectively absorbing external light and reflecting panel light in a relationship with the lower width P1. .

As described above, the width of the pattern portion 120 is increased from the upper end (b) to the lower end (a) so as to have an inclined surface in which the aperture ratio and external light blocking are maximized.

Table 1 below shows the results of experiments on the opening ratio and the external light blocking effect of the external light blocking sheet according to the width at the bottom width P1 of the pattern part of the external light blocking sheet 100 and the middle of the height of the pattern part (h / 2). This is the case where the bottom bottom width is 23 µm.

pattern Bottom width pattern Center width Aperture Outer light  block 23.0㎛ 23.0㎛ 50% ○ 23.0㎛ 22.0㎛ 55% ○ 23.0㎛ 20.0 ㎛ 60% ○ 23.0㎛ 18.0㎛ 65% ○ 23.0㎛ 16.0㎛ 70% ○ 23.0㎛ 14.0㎛ 72% ○ 23.0㎛ 12.0㎛ 75% ○ 23.0㎛ 10.0㎛ 78% ○ 23.0㎛  9.0 μm 80% ○ 23.0㎛  8.0㎛ 83% △ 23.0㎛  6.0 μm 85% △ 23.0㎛  5.0㎛ 90% X

Referring to Table 1, when the bottom width P1 of the pattern portion of the exterior light shielding sheet 100 is 23.0 μm, the light emitted from the inside of the panel is formed when the width at the center of the pattern portion h / 2 is 23 μm or less. This is passed to the user side to ensure an appropriate 50% or more aperture ratio for displaying an image. However, when the width at the center of the pattern portion (h / 2) is formed to 8 μm or less, the efficiency of blocking external light may be reduced, and when formed to 5 μm or less, external light may be incident on the panel.

Therefore, when the width at the center height (h / 2) of the pattern portion of the external light shielding sheet is 1 to 3.5 times or 1.5 to 2.5 times the lower width P2, external light may be prevented from entering the panel. Appropriate opening ratio can be secured.

Referring to FIG. 4C, the pattern portion 120 of the external light blocking sheet 100b may have a curved shape in which an inclined surface of the outer circumferential surface is curved toward the inside of the panel, and in this case, external light is refracted into the pattern portion on the inclined surface of the pattern portion. The efficiency of blocking can be increased, and the top and bottom of the pattern portion as well as the inclined surface may be formed in a curved shape having a predetermined curvature.

In addition, the inclined surface of the pattern portion may have a form having two inclined surfaces different from each other in the form of a curve rather than a curved shape.

Referring to FIG. 4D, the pattern part 120 may have a curved shape of left and right inclined surfaces as shown in FIG. 4C, and the upper end b of the pattern part may also have a curved shape as shown in FIG. 4D. There will be. In such a case, it is possible to improve the difficulty in manufacturing a pattern portion having a very small shape in the form of a triangle.

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 to display an image. It is preferable.

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 aperture 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 can be maximized.

The height h of the pattern portion may vary according to the thickness T of the external light shielding sheet. In general, since the external light incident on the panel affects the decrease in bright room contrast mainly located above the position of the panel, in order to effectively block external light incident on the panel, the height h of the pattern portion is the thickness of the external light shielding sheet ( It is preferable to have a value within a certain ratio range for T).

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 may become thinner, and insulation breakdown may occur. As the height h of the pattern portion decreases, the external light panel having an angle within a predetermined range is reduced. It is incident to the outside light blocking is not made properly.

Table 2 below shows the results of experiments on the effects of the breakdown and the external light blocking effect of the external light blocking sheet according to the thickness (T) of the external light blocking sheet and the height (h) of the pattern portion.

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 2, 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. When 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 destroyed, thereby reducing the defective rate of the external light blocking sheet. However, when the height h 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.

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. More preferably, the thickness T of the external light shielding sheet may be equal to the height of the pattern portion h in order to prevent dielectric breakdown and external light incident on the panel and to increase the reflectance of the light emitted from the panel and to sufficiently secure the viewing angle. It may be 1.01 times to 1.5 times.

6 is a view schematically showing the front surface of the external light blocking sheet according to the present invention.

Referring to FIG. 6, in the exterior light shielding sheet 100 according to the present invention, the pattern portion 120 is preferably formed side by side at a predetermined interval on the base portion 110, but is not limited thereto. Another pattern portion may be further formed in a direction crossing the illustrated pattern portion 120, and a moire may be generated by interference of the pattern portion with the black matrix formed in the panel and the black layer, the partition wall, the bus electrode, and the like. In order to prevent the phenomenon, the pattern unit 120 may be formed to be inclined by a predetermined angle with respect to the top or bottom of the external light blocking sheet.

Here, the moiré phenomenon refers to a low frequency pattern generated by overlapping similar lattice patterns, for example, there is a wave pattern seen when the mosquito nets are superimposed.

Table 3 below shows the results of experiments on whether moiré issuance and the external light blocking effect according to the ratio of the width P1 of the pattern portion of the external light blocking sheet to the width of the bus electrode formed on the upper substrate of the panel. It is a 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 3, when the width of the bottom of the pattern portion is 0.2 times to 0.5 times the width of the bus electrode, it is possible to reduce the moiré phenomenon and 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 of the lower end of the pattern portion is preferably 0.25 times to 0.4 times the width of the bus electrode.

Table 4 below shows the results of experiments on the occurrence of moiré phenomenon and external light blocking effect according to the ratio of the width of the bottom of the pattern portion of the external light blocking sheet to the width of the vertical partition formed on the lower substrate of the panel. If

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 4, when the width of the bottom of the pattern portion is 0.3 times to 0.8 times the width of the vertical partition wall, it is possible to reduce the moiré phenomenon and to 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 of the lower end of the pattern portion is preferably 0.4 times to 0.65 times the width of the vertical partition wall.

7A to 8B 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 may include an AR / NIR sheet, an EMI shield sheet, an external light shield sheet, and an optical sheet. And the like.

7A to 8B, the AR / NIR sheet 210 is an AR having 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 to ensure that the signals transmitted using infrared rays such as a remote control 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. 7A, the AR / NIR sheet 210, the EMI shield sheet 220, and the external light shielding sheet 230 are stacked in this order. However, as illustrated in FIG. 7B, 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.

8A to 8B, 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. 7A and 7B. 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. 7A to 8B 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.

9 is a view showing an embodiment of the structure of a plasma display device according to the present invention.

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 having a thickness of 10 μm to 30 μm is formed between the filter 100 and the panel to form a layer to facilitate adhesion of the panel and the filter 100, and at the same time, to improve adhesiveness. In addition, in order to protect the panel from external pressure, the adhesive layer may be formed to have a thickness of 30 μm to 120 μm between the filter 100 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 the application is made by those skilled in the art within the technically protected scope of the present invention. It is possible.

Plasma display device of the present invention is configured as described above is attached to the front of the panel of the external light blocking sheet that absorbs and blocks the light incident from the outside can realize a black image close to the primary color, accordingly Has the effect of improving.

In addition, the thickness of the external light shielding sheet and the height of the pattern portion are formed at a predetermined ratio so that the aperture ratio of the external light shielding sheet can be properly secured, so that the light emitted into the panel can be transmitted to the user side as much as possible.

Claims (23)

A plasma display panel; A filter formed on the front surface of the plasma display panel; The filter, A base portion; And An external light shielding sheet having a plurality of pattern portions formed on the base portion, The thickness of the external light shielding sheet is a plasma display device, characterized in that 1.01 to 1.5 times the height of the pattern portion. According to claim 1, The thickness of the external light shielding sheet is a plasma display device, characterized in that 1.1 to 1.5 times the height of the pattern portion. According to claim 1, The refractive index of the pattern portion is smaller than the refractive index of the base portion plasma display device. According to claim 1, And a refractive index of the pattern portion is 0.300 times to 0.999 times the refractive index of the base portion. According to claim 1, And the bottom width of the pattern portion is 1 to 3.5 times the width in the middle of the height of the pattern portion. According to claim 1, And the lower width of the pattern portion is 1.5 to 2.5 times the width at the middle of the height of the pattern portion. According to claim 1, And the shortest distance between the pattern portions adjacent to each other is 1.1 to 5 times the width of the bottom of the pattern portion. According to claim 1, And the shortest distance between the pattern portions adjacent to each other is 1.5 to 3.5 times the width of the bottom of the pattern portion. According to claim 1, And the pattern portion height is 0.89 to 4.25 times the shortest distance between adjacent pattern portions. According to claim 1, And the height of the pattern portion is 1.5 to 3 times the shortest distance between the pattern portions adjacent to each other. According to claim 1, And a spacing between the upper ends of the pattern portions adjacent to each other is 1 to 3.25 times the shortest distance. According to claim 1, The distance between the upper end of the pattern portion adjacent to each other is a plasma display device, characterized in that 1.2 to 2.5 times the shortest distance. According to claim 1, The filter, An anti-reflection layer for preventing reflection of external light; A near infrared shielding layer for shielding near infrared rays emitted from the panel; And And at least one of electromagnetic shielding layers for shielding electromagnetic waves. A base portion; And An external light blocking sheet formed on the base part and including a pattern part having a refractive index smaller than that of the base part, The thickness of the external light shielding sheet is a filter, characterized in that 1.01 times to 1.5 times the height of the pattern portion. The method of claim 14, The thickness of the external light shielding sheet is a filter, characterized in that 1.1 to 1.5 times the height of the pattern portion. The method of claim 14, The bottom width of the pattern portion is a filter, characterized in that 1 to 3.5 times the width in the middle of the height of the pattern portion. The method of claim 14, The shortest distance between the pattern portion adjacent to each other is characterized in that 1.1 to 5 times the width of the bottom of the pattern portion. The method of claim 14, And the pattern portion height is 0.89 to 4.25 times the shortest distance between the adjacent pattern portions. The method of claim 14, The interval between the upper end of the pattern portion adjacent to each other is a filter, characterized in that 1 to 3.25 times the shortest distance. The method of claim 14, An anti-reflection layer for preventing reflection of external light; A near infrared shielding layer for shielding near infrared rays; And And at least one of electromagnetic shielding layers for shielding electromagnetic waves. The method of claim 20, The pattern part includes a lower end of the first width and an upper end of the second width smaller than the first width, At least one of the near-infrared shielding layer, the anti-reflection layer, and the electromagnetic shielding layer is formed at a lower end side of the pattern portion. The method of claim 14, The external light blocking sheet has a thickness of 100um to 180um. The method of claim 14, The pattern portion is characterized in that the filter is 80um to 110um.

Images