KR100848287B1 - Sheet for protecting external light and plasma display device thereof - Google Patents

Abstract

The present invention relates to a plasma display device, comprising: a plasma display panel; And an external light blocking sheet formed on the front surface of the plasma display panel to absorb external light incident on the panel, wherein the external light blocking sheet comprises: a base part; And a pattern part for absorbing external light incident from at least three of upper, lower, left, and right sides of the panel.

According to the present invention, the plasma display device can effectively realize a black image and improve contrast with clear light by placing an external light blocking sheet that absorbs and blocks light incident from the outside in front of the panel. . In addition, by forming a pattern portion that absorbs external light in two or more directions to block external light incident from the left side or the right side as well as the upper side of the panel, clear contrast can be further improved.

PDP, Clarity Contrast, Front Filter, Luminance

Description

Exterior light blocking sheet and plasma display device using same

1 is a perspective view showing an embodiment of a structure of a plasma display panel according to the present invention.

2 is a cross-sectional view showing embodiments of the structure according to the present invention.

4A and 4B are cross-sectional views illustrating embodiments of a structure of an external light blocking sheet including light absorbing particles.

Figure 4c is a cross-sectional view showing an embodiment of the front shape of the external light blocking sheet.

5A to 5F are cross-sectional views illustrating embodiments of the cross-sectional shape of the pattern portion of the external light blocking sheet.

6 is a cross-sectional view showing an embodiment of a filter to which an external light blocking sheet is applied.

7A to 7C are cross-sectional views illustrating embodiments of a pattern portion cross-sectional shape including a corner portion of a curved shape of the exterior light shielding sheet according to the present invention.

8 is a cross-sectional view showing an embodiment of the cross-sectional shape of the pattern portion having a curved corner portion.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and in particular, by manufacturing an external light shielding sheet in order to block external light incident from the outside of the panel and placing it in front of the panel, the contrast of the panel is clear. The present invention relates to a plasma display device in which brightness is maintained and brightness is maintained.

In general, a plasma display panel is a device for displaying an image including a character or a graphic by applying a predetermined voltage to the electrodes installed in the discharge space to generate a discharge, and the plasma generated during gas discharge excites the phosphor. It is advantageous in that it is easy to enlarge, lighten, and thinner, to provide a wide viewing angle up, down, left and right, and to realize full color and high brightness.

When the plasma display panel implements a black image, external light is reflected from the front of the panel due to the white phosphor exposed on the lower panel of the panel, so that the black image is perceived as a dark color of a bright series and contrast is increased. There is a problem of deterioration.

The present invention has been made to solve the above-mentioned problems of the prior art, and effectively block the external light incident on the panel to prevent reflection of the light, to improve the clear contrast and brightness of the plasma display panel plasma display The purpose is to provide a device.

Plasma display device according to the present invention for solving the above technical problem, the plasma display panel; And an external light blocking sheet formed on a front surface of the plasma display panel to absorb external light incident on the panel.

The external light blocking sheet has a base portion; And a pattern portion formed on the base portion and having a refractive index smaller than that of the base portion, wherein at least one of the corner portions of the pattern portion has a curved shape.

At least one of the corner portions of the pattern portion may have a radius of curvature of 10 μm to 3 mm, and preferably may have a radius of curvature of 100 μm to 800 μm.

The refractive index of the pattern portion is preferably 0.3 times to 0.99 times the refractive index of the base portion.

Another plasma display device according to the present invention for solving the above technical problem, the pattern portion has a cross-sectional shape asymmetrical, at least one of the edge portion of the pattern portion is characterized in that the curved shape.

External light blocking sheet according to the present invention for solving the above technical problem is a base portion; And a pattern portion formed on the base portion and having a refractive index smaller than that of the base portion, wherein at least one of the corner portions of the pattern portion has a curved shape.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a perspective view showing an embodiment of a plasma display panel according to the present invention.

As shown in FIG. 1, the plasma display panel includes scan electrodes 11, sustain electrodes 12, sustain electrodes 12, and address electrodes 22 formed on the lower substrate 20, which are pairs of sustain electrodes formed on the upper substrate 10. It includes.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and the bus electrodes 11b and 12b. 12b) may be formed of a metal such as silver (Ag) or chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). . The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce 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 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. 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.

Between the transparent electrodes 11a and 12a of the scan electrode 11 and the sustain electrode 12 and the bus electrodes 11b and 11c, external light generated from the outside of the upper substrate 10 is absorbed to reduce reflection. Black matrixes (BMs, 15) are arranged that function to block light 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 formed at positions overlapping the partition wall 21. And the 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 and thus not 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 formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 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 in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, a lower dielectric layer 24 and a partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into 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 channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall 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.

Meanwhile, in one embodiment of the present invention, although the R, G and B discharge cells are shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

As shown in FIG. 1, it is preferable that the external light blocking sheet 100 is positioned on the front surface of the plasma display panel according to the present invention. The external light shielding sheet 100 absorbs the light incident to the panel from the outside so as not to be reflected to the observer side, and reflects the light from the panel to the outside to improve the clear room contrast of the display image.

The external light blocking sheet 100 may be attached to the front of the panel, or may be spaced apart from the panel by a predetermined interval. In addition, the plasma display apparatus according to the present invention may further include a glass filter (not shown) formed to be spaced apart from the front surface of the panel, the external light blocking sheet 100 may be attached to the glass filter (not shown). .

The external light blocking sheet 100 may further include an anti-reflection (AR) layer, a near infrared (NIR) shielding layer, or an electromagnetic interference shield (EMI) shielding layer. In addition, when the external light blocking sheet 100 is attached to a glass filter (not shown), the AR layer, NIR shielding layer or EMI shielding layer may be attached to the glass filter (not shown).

2a to 3b are sectional views showing embodiments of the structure of the filter applied to the external light blocking sheet according to the present invention, the filter formed on the front surface of the plasma display panel is AR / NIR sheet, EMI shielding sheet, external light blocking Sheets, optical properties sheets, and the like.

2A and 2B, 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. An anti-reflection (AR) layer 211 is attached, and a rear infrared shielding layer 212 for shielding near-infrared rays emitted from the panel on the rear surface thereof so that signals transmitted using infrared rays such as a remote controller can be normally transmitted. ) Is attached.

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 is typically formed of a mesh structure using a conductive material, and the ratio of the EMI shielding sheet 220 in which an image is not displayed in order to make the grounding smooth is made. The conductive material is entirely coated on the effective display area.

Typically, the external light source is most often present at the top of the observer's head, indoors or outdoors. The external light blocking sheet 230 is attached to effectively block the external light so that the black image of the plasma display panel can be darker.

Since the adhesive 240 forms a layer between the AR / NIR sheet 210, the EMI shield sheet 220, and the external light shielding sheet 230, the sheets 210, 220, 230, and the filter 200, respectively. ) To be firmly attached to the front of the panel. In addition, the material of the base sheet included between each of the sheets 210, 220, and 230 is preferably used in consideration of the ease of fabrication of the filter 200.

Meanwhile, in FIG. 2A, 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. 2B, the AR / NIR sheet 210 and external light are stacked. As the stacking layer 230 and the EMI shielding sheet 220 may be stacked in order, the stacking order of each sheet may be differently stacked by those skilled in the art. In addition, at least one of the illustrated sheets 210, 220, 230 may be omitted.

Referring to FIGS. 3A and 3B, the filter 300 formed on the 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. 2A and 2B. 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 shown in FIGS. 2A to 3B may be omitted, and any one of the basesheets may be made of hard glass, which is not made of plastic, to improve the function of protecting the panel. You can. The glass is preferably formed spaced apart from the panel at a predetermined interval.

4A and 4B illustrate a cross-sectional view of an example of the structure of the external light blocking sheet according to the present invention, and the external light blocking sheet includes a base part 400 and a pattern part 410.

Base portion 400 is preferably made of a transparent plastic material, for example, a resin-based material formed by UV (UV) curing, so as to transmit light smoothly, and enhances the effect of protecting the front surface of the panel. For this purpose, a rigid glass material may be used.

Referring to FIG. 4A, the pattern portion 410 may have a triangular shape, or may have various shapes. The pattern part 410 is formed of a material of darker color than the base part 400, and is preferably made of a black material. For example, the pattern portion 410 is formed of a carbon-based material or by applying a black dye to maximize the effect of absorbing external light.

As shown in FIG. 4A, the pattern portion 410 preferably includes light absorbing particles 420, and the light absorbing particles 420 may be resin particles colored in a specific color. In order to maximize the light absorption effect, the light absorbing particles 420 are preferably colored black.

In order to facilitate the manufacture of the light absorbing particles 420 and the addition into the pattern portion 410 and to maximize the effect of absorbing external light, the size of the light absorbing particles 420 is preferably 1 μm or more. In addition, when the size of the light absorbing particles 420 is 1㎛ or more, the pattern portion 410 includes 10% by weight or more of the light absorbing particles 420 in order to effectively absorb the external light refracted by the pattern portion 410. It is preferable. That is, it is preferable that the light absorbing particles having a weight of 10% or more of the total weight of the pattern portion 410 are included in the pattern portion 420.

Referring to FIG. 4A, the shape of the light absorbing particles 420 may be circular. In this case, the diameter of the light absorbing particles 420 may be 1 μm or more. On the other hand, the shape of the light absorbing particles 420 by the manufacturing process or for other purposes may not have a circular shape, in this case it is preferable that the diameter of the circle circumscribed or inscribed to the light absorbing particles 420 is 1㎛ or more. .

As shown in FIG. 4B, the size of the light absorbing particles included in the pattern portion 410 may be different from each other. In this case, the average size of the light absorbing particles included in the pattern portion 410 is preferably 1 μm or more. Do. That is, the average diameter of the light absorbing particles shown in Figure 4b is preferably 1㎛ or more.

When the size of the light absorbing particles 420 is 1 μm or less, in order to effectively absorb external light that is refracted from the inclined surface of the pattern portion 410, the pattern portion 410 may have 2 to 10 wt% of the light absorbing particles 420. It is preferable to include. That is, it is preferable that the light absorbing particles having a weight of 2 to 10% of the total weight of the pattern portion 410 are included in the pattern portion 420, and the light absorbing particles are evenly distributed in the pattern portion 410.

As shown in Figure 4b, the size of the light absorbing particles may be different from each other, in this case it is preferable that the average size of the light absorbing particles is 1㎛ or less.

In order to increase absorption of external light, the light absorbing particles may be formed on the outer surface of the pattern portion 410.

The refractive index of the pattern portion 410 and at least the refractive index of the inclined surface of the pattern portion 410 is smaller than the refractive index of the base portion 400. External light, which lowers the contrast of the plasma display panel, is often present at the top of the observer's head. Referring to FIG. 4A, according to Snell's law, external light (indicated by dashed lines) obliquely incident on the external light blocking sheet is refracted and absorbed into the pattern part 410 having a refractive index smaller than that of the base part 400. do. External light refracted into the pattern portion 410 may be absorbed by the light absorbing particles 420.

 In addition, the light (shown in solid line) emitted from the panel to the outside for display is totally reflected on the inclined surface of the pattern portion 410 to be reflected to the outside which is the observer's side.

As described above, the external light (indicated by the dotted line) is refracted and absorbed by the pattern portion 410, and the light emitted from the panel (indicated by the solid line) is totally reflected by the pattern portion 410, as shown in FIG. 4A. This is because the angle formed with the inclined surface of the pattern portion 410 is greater than the light of the panel.

Therefore, the external light blocking sheet according to the present invention absorbs the external light so that external light is not reflected to the observer side, and improves the clear contrast of the display image by increasing the amount of reflection of the light emitted from the panel.

In order to maximize absorption of external light and total reflection of panel light in consideration of the general angle of external light incident on the panel, the refractive index of the pattern part 410 is preferably 0.3 times to 0.99 times the refractive index of the base part 400.

The thickness T of the external light shielding sheet according to the present invention is preferably 20 μm to 250 μm, in which case the manufacturing process may be easy, and may have an appropriate light transmittance. More preferably, in order to allow the light emitted from the panel to be transmitted smoothly, and the light incident from the outside is refracted to be effectively absorbed and blocked by the pattern portion 410, the thickness (T) of the external light shielding sheet is 200um to It is formed in 210um.

Figure 4c illustrates embodiments of the front shape of the exterior light shielding sheet according to the present invention.

Referring to FIG. 4C, the external light blocking sheet 430 has a pattern portion 450 having a refractive index smaller than that of the base portion 440 on the base portion 440. As shown in FIG. 4C, the pattern portion 450 may form a plurality of rows on the base portion 440. In addition, the pattern portions 450 formed in a line may be obliquely formed at a predetermined angle on the base portion 440 to prevent moiré phenomenon.

5A to 5F illustrate cross-sectional views of embodiments of a cross-sectional shape of the pattern portion of the external light blocking sheet according to the present invention.

Referring to FIG. 5A, the pattern part 510 formed on the base part 500 may have a triangular shape, and more preferably has an isosceles triangular shape. In addition, the bottom width P1 of the pattern portion 510 may be 5 μm to 150 μm, and in this case, an aperture ratio may be secured so that light generated from the panel may be smoothly emitted to the observer side.

The height h of the base part 500 is formed to be 30 to 250 um, and may form an inclined surface slope capable of effectively absorbing external light and reflecting panel light in relation to the bottom width P1.

Referring to FIG. 5B, the pattern portion 520 may be formed in left and right asymmetric shapes. That is, the areas of the left and right inclined surfaces of the pattern unit 520 may be different from each other, or the angles of the left and right inclined surfaces may be different from each other.

Referring to FIG. 5C, the pattern portion 530 may have a trapezoidal shape, in which case, the width P2 of the upper end is larger than the width P1 of the lower end. In addition, it is preferable that the width P2 of the upper end of the pattern portion 530 is 130 μm or less, thereby forming an inclined surface slope capable of effectively absorbing external light and reflecting panel light in relation to the lower width P1. have.

As shown in FIGS. 5D to 5F, the shapes of the pattern parts illustrated in FIGS. 5A to 5C may have curved shapes of left and right inclined surfaces, respectively. In addition, the top or bottom of the pattern may have a curved shape.

6 is a cross-sectional view showing an embodiment of the filter applied to the external light blocking sheet according to the present invention, as shown in the external light blocking sheet 610 according to the present invention is an AR layer, NIR shielding layer or EMI shielding layer And may be attached to a filter 620 including the like. In addition, the filter 620 to which the external light blocking sheet 610 is applied may be attached to the front surface of the plasma display panel 600.

As shown in FIG. 6, light emitted from the panel 600 to which the external light blocking sheet 610 is attached (indicated by a solid line) is total reflection at an inclined surface of the pattern portion 640 having a refractive index smaller than that of the base portion 630. And emitted to the outside, the external light incident from the outside (represented by a dotted line) is refracted and absorbed into the pattern portion 640.

As the refractive index of the pattern portion 640 becomes smaller than the refractive index of the base portion 630, the amount of reflection of light emitted from the panel 600 increases. Therefore, in order to maximize the total reflection of the light emitted from the panel 600 on the inclined surface of the pattern portion 640, considering the vertical viewing angle of the plasma display panel, the refractive index of the pattern portion 640 is equal to the refractive index of the base portion 630. It is preferable that they are 0.3 times-0.8 times.

7A to 7C are cross-sectional views illustrating embodiments of a cross-sectional shape of the pattern portion of the exterior light shielding sheet according to the present invention. As illustrated, the edge portion of the pattern portion may be formed in a curved shape to have a predetermined curvature. desirable.

Referring to FIG. 7A, the corner portions 720, 730, and 740 of the pattern portion 710 may have a curved shape, and some of the corner portions 720, 730, and 740 have a predetermined curvature. It may be formed as.

When the external light blocking sheet according to the present invention is laminated to a film or glass, the pattern portion 710 is prevented from being peeled off from the base portion 700, and the pattern portion 710 is prevented by impact due to heat or pressure. In order to prevent peeling from the base portion 700, the radius of curvature of the corner portions 720, 730, and 740 of the pattern portion 710 is preferably 10 μm to 3 mm.

Referring to FIG. 7B, the pattern portion 760 may have a right and left asymmetrical shape, and the corner portion of the pattern portion 760 may have a thickness of 10 μm or more to prevent the pattern portion 760 from being separated from the base portion 750. It may be formed in the form of a curve having a radius of curvature of 3 mm.

Referring to FIG. 7C, the upper portion of the pattern portion 780 may have a shape similar to a trapezoid in which the upper portion of the pattern portion 780 is present. In this case, at least one of the four corner portions has a curvature radius of 10 μm to 3 mm. It can be formed as.

8 is a cross-sectional view of an embodiment of a cross-sectional shape of a pattern portion having a curved edge portion.

Referring to Figure 8, the corner portion of the pattern unit 810 formed on the base portion 800 may have a radius of curvature r _1, r _2, r _3, respectively, wherein r _1, r _2, r ₃ is It may be the same or different from each other.

In addition, by forming the upper edge portion of the pattern portion 810 in a curved shape, the pattern portion 810 may absorb external light incident to the panel at various incidence angles.

In order to prevent the pattern portion 810 from being peeled from the base portion 800 during impact due to lamination or heat, and to effectively absorb external light, the radius of curvature r ₁ , r ₂ , r ₃ , In particular, it is preferable that the radius of curvature r ₁ of the upper edge portion is 100 μm to 800 μm.

 Although a preferred embodiment of the present invention has been described in detail above, those skilled in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

Plasma display device of the present invention configured as described above is an external light blocking sheet that absorbs and blocks the light incident from the outside as possible in front of the panel can effectively implement a black image and improve the contrast contrast (clear) can do. In addition, by forming a pattern portion that absorbs external light in two or more directions to block external light incident from the left side or the right side as well as the upper side of the panel, clear contrast can be further improved.

Claims (20)

A plasma display panel; And An external light blocking sheet formed on a front surface of the plasma display panel to absorb external light incident on the panel; The external light blocking sheet has a base portion; And a pattern portion formed on the base portion and having a refractive index smaller than that of the base portion, wherein at least one of the corner portions of the pattern portion has a curved shape. The method of claim 1, At least one of the corner portions of the pattern portion has a radius of curvature of 10 μm to 3 mm. The method of claim 1, At least one of the corner portions of the pattern portion has a radius of curvature of 100 μm to 800 μm. The method of claim 1, The refractive index of the pattern portion is a plasma display device, characterized in that 0.3 to 0.99 times the refractive index of the base portion. The method of claim 1, wherein the pattern portion A plasma display device comprising light absorbing particles. The method of claim 1, wherein the base portion Plasma display device, characterized in that made of a transparent plastic material. The method of claim 1, wherein the pattern portion Plasma display device, characterized in that made of carbon-based material. The method of claim 1, The brightness of the pattern portion is lower than the brightness of the base portion plasma display device. The method of claim 1, The thickness of the external light shielding sheet is a plasma display device, characterized in that 20um to 250um. The method of claim 1, wherein the pattern portion The width of the upper end on the observer side is narrower than the width of the lower end on the panel side. The method of claim 1, The width of the bottom of the pattern portion is a plasma display device, characterized in that 5um to 150um. The method of claim 1, The width of the upper portion of the pattern portion is a plasma display device, characterized in that less than 130um. The method of claim 1, wherein the height of the pattern portion Plasma display device, characterized in that 30 to 250um. A base portion; And A pattern portion formed on the base portion and having a refractive index smaller than that of the base portion, At least one of the corner portions of the pattern portion is an external light blocking sheet, characterized in that it has a curved form. The method of claim 14, At least one of the corner portions of the pattern portion is an external light shielding sheet, characterized in that it has a radius of curvature of 10㎛ to 3mm. The method of claim 14, The refractive index of the pattern portion is an external light shielding sheet, characterized in that 0.3 to 0.99 times the refractive index of the base portion. The method of claim 14, An AR layer preventing reflection of external light; A NIR shielding layer that shields near infrared rays emitted from the panel; And External light shielding sheet, characterized in that it comprises at least one of the EMI shielding layer for shielding electromagnetic waves. A plasma display panel; And An external light blocking sheet formed on a front surface of the plasma display panel to absorb external light incident on the panel; The external light blocking sheet has 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 pattern portion has a cross-sectional shape asymmetrically left and right, and at least one of the corner portions of the pattern portion has a curved shape. delete The method of claim 18, At least one of the corner portions of the pattern portion has a radius of curvature of 10 μm to 3 mm.

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