KR100829503B1 - Exterior light shielding sheet and plasma display device using same - Google Patents

Abstract

An external light blocking sheet and a plasma display apparatus using the same are provided to improve the ability of external absorption without narrowing left and right view angles by using a plurality of pattern sections for absorbing an external light. A plasma display apparatus includes a plasma display panel and an external light blocking sheet. The external light blocking sheet is located on the front surface of the plasma display panel and includes a base(200) and a plurality of pattern sections(210) for absorbing an external light formed on the base. At least one front shape out of the plural pattern sections includes a rising part rising with an average inclination of 0.5 degree to 45 degrees, and a falling part falling with an average inclination of -45 degrees to -0.5 degree. One of the rising and falling parts has an inclination value of 2 or more. The pattern section has a refractive index greater than that of the base.

Description

Exterior light blocking sheet and plasma display device using same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device. In particular, in order to block external light incident from the outside of a panel, an external light shielding sheet is manufactured and attached to the front surface of the panel, thereby improving contrast and maintaining brightness of the panel. The present invention relates to a plasma display device.

In general, a plasma display panel generates a discharge by applying a predetermined voltage to electrodes provided in a discharge space, and plasma generated during gas discharge excites a phosphor, thereby displaying an image including a character or a graphic. It is advantageous in that it is easy to thin a plane, provides a wide viewing angle up and down, left and right, and realizes full color and high brightness.

In the panel as described above, when the black image is implemented, 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 the contrast is reduced. There is a problem.

The present invention has been made to solve the above-mentioned problems of the prior art, and effectively blocks external light incident on the display panel, thereby improving the brightness of the panel, improving brightness, and reducing the moiré phenomenon. It is an object of the present invention to provide a blocking sheet and a plasma display device using the same.

Plasma display device according to the present invention for solving the above technical problem, the plasma display panel; And an external light blocking sheet disposed on a front surface of the panel and including a base portion and a plurality of pattern portions formed on the base portion to absorb external light, wherein a front shape of at least one of the plurality of pattern portions is 0.5 degrees. It characterized in that it comprises a rising portion that rises with an average slope of to 45 degrees and a falling portion having an average slope of -45 to -0.5 degrees.

Another plasma display device according to the present invention for solving the above technical problem, the plasma display panel; And an external light blocking sheet disposed on a front surface of the panel and including a base portion and a plurality of pattern portions formed on the base portion to absorb external light, wherein the external light blocking sheet is adjacent to each other in a parallel direction. A pattern portion and a second pattern portion; And a third pattern part which is formed in a direction crossing the first and second pattern parts and connects the first and second pattern parts.

External light blocking sheet according to the present invention for solving the above technical problem, the base portion; And a plurality of pattern portions formed on the base portion to absorb external light, wherein at least one of the front surface shapes of the plurality of pattern portions rises with an average inclination of 0.5 degrees to 45 degrees, and -45 degrees to- It characterized in that it comprises a lower portion descending with an average slope of 0.5 degrees.

Another external light blocking sheet according to the present invention for solving the above technical problem, the base portion; And a plurality of pattern portions formed on the base portion to absorb external light, wherein at least one of the front surface shapes of the plurality of pattern portions rises with an average inclination of 0.5 degrees to 45 degrees, and -45 degrees to- It characterized in that it comprises a lower portion descending with an average slope of 0.5 degrees.

According to the filter and the plasma display device using the same according to the present invention configured as described above, it is possible to effectively implement a black image by placing an external light shielding sheet that absorbs and blocks the light incident from the outside to the front of the display panel. And can improve the contrast. Further, by forming the direction of the pattern portion that absorbs external light at two or more in a specific angle range, it is possible to absorb external light incident from the left or right side as well as the upper and lower sides without greatly narrowing the left and right viewing angles.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 30. 1 illustrates a perspective view of an embodiment of a plasma display panel.

As shown in FIG. 1, the plasma display panel includes a scan electrode 11, a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. 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 (Indi μm-Tin-Oxide; ITO), and the bus electrodes 11b. , 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). have. 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.

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

The black matrix according to the exemplary embodiment of the present invention is formed on the upper substrate 10, and the first black matrix 15, the transparent electrodes 11a and 12a and the bus electrode are formed at positions overlapping the partition wall 21. The second black matrices 11c and 12c formed between the 11b and 12b may be formed. 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.

Since the bus electrodes 11b and 12b or the partition wall 21 have a dark color, the light blocking function absorbs external light generated from the outside and reduces reflection, such as the black matrix, thereby improving contrast. have. Alternatively, a specific member formed on the upper substrate 10, for example, the dielectric layer 13 and the specific member formed on the lower substrate 20, for example, the partition wall 21, have a complementary color relationship with each other, so that they overlap when viewed from the front of the panel. It can also function as the black matrix by making the portion appear closer to black.

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 the discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells. have.

Referring to FIG. 1, 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 has an external light blocking sheet, an anti-reflection (AR) sheet, and a near infrared shield (NIR). Sheets, EMI (Electromagnetic Interference) shielding sheet, diffusion sheet, optical properties sheet and the like can be included.

When the distance between the filter 100 and the panel is 10 μm to 30 μm, light incident from the outside may be effectively blocked, and light emitted from the panel may be effectively emitted to the outside. In addition, in order to protect the panel from the pressure from the outside, the distance between the filter 100 and the panel can be 30㎛ to 120㎛, and between the filter 100 and the panel to prevent impact An adhesive layer having a function of shock absorption may be formed.

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.

2 is a cross-sectional view showing an embodiment of the external light blocking sheet structure provided in the filter according to the present invention, the external light blocking sheet comprises a base portion 200 and the pattern portion 210.

Base portion 200 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 of the panel For this purpose, a rigid glass material may be used.

Referring to FIG. 2, the pattern portion 210 may have a triangular shape, or may have various shapes. The pattern part 210 is formed of a material of darker color than the base part 200, and preferably, a material of black color. For example, the pattern unit 210 may be formed of a carbon-based material or may apply a black dye to maximize the effect of absorbing external light. Hereinafter, the wider of the upper and lower ends of the pattern unit 210 is referred to as the lower end of the pattern unit 210.

In FIG. 2, the lower end of the pattern part 210 may be disposed on the panel side, and the upper end of the pattern part 210 may be disposed on the observer side where external light is incident. In addition, in contrast to the arrangement, the lower end of the pattern portion 210 may be disposed toward the observer side, and the upper end of the pattern portion 210 may be disposed on the panel side.

Since the external light source is generally located above the panel, the external light is incident on the panel at an angle from the upper side and absorbed by the pattern portion 210.

The pattern unit 210 may include light absorbing particles, and the light absorbing particles may be resin particles colored in a specific color. In order to maximize the light absorption effect, the light absorbing particles are preferably colored black.

In order to facilitate the manufacture of the light absorbing particles and the addition into the pattern portion 210 and to maximize the effect of absorbing external light, the size of the light absorbing particles may be 1 μm or more. In addition, when the size of the light absorbing particles is 1 μm or more, the pattern unit 210 may include 10 wt% or more of the light absorbing particles in order to effectively absorb external light refracted by the pattern unit 210. That is, light absorbing particles having a weight of 10% or more of the total weight of the pattern portion 210 may be included in the pattern portion 210.

3 to 6 are sectional views showing embodiments of the structure of the external light blocking sheet to explain the optical characteristics according to the structure of the external light blocking sheet.

In the case of FIG. 3, in order to absorb and block external light and totally reflect visible light emitted from the panel to increase the reflectance of the panel light, the refractive index of the pattern portion 305 and the refractive index of the inclined surface that is at least part of the pattern portion 305 are based on. It is a case where it is made smaller than the refractive index of the part 300.

As described above, the external light that lowers the clear room contrast of the plasma display panel is often located above the panel. Referring to FIG. 3, 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 310 having a refractive index smaller than that of the base part 300. . External light refracted into the pattern portion 305 may be absorbed by the light absorbing particles.

 In addition, light (shown in solid line) emitted from the panel 310 to the outside for display is totally reflected on the inclined surface of the pattern portion 305 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 305 and the light emitted by the panel 310 (indicated by the solid line) is totally reflected by the pattern portion 305. As shown, the angle between the light of the panel 310 and the inclined surface of the pattern portion 305 is greater than that of the inclined surface of the pattern portion 305.

Therefore, the external light blocking sheet according to the present invention absorbs external light so that the 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 310.

In order to maximize absorption of external light and total reflection of light of the panel 310 in consideration of the angle of external light incident on the panel 310, the refractive index of the pattern part 305 is 0.3 times or more and less than 1 times the refractive index of the base part 300. It is preferable. In order to maximize the total reflection of the light emitted from the panel 310 on the inclined surface of the pattern portion 305, considering the vertical viewing angle of the plasma display panel, the refractive index of the pattern portion 305 is 0.3 times the refractive index of the base portion 300. It is preferable that it is times-0.8 times.

As shown in FIG. 3, when the upper end of the pattern portion 305 is disposed on the observer side and the refractive index of the pattern portion 305 is smaller than the refractive index of the base portion 300, the light emitted from the panel is pattern portion 305. Because it is reflected from the inclined surface of the and spreads to the observer's side, a ghost phenomenon may occur when the image is not clear and distorted when viewed from the observer's side.

4 illustrates a case where the upper end of the pattern part 325 is disposed on the observer side and the refractive index of the pattern part 325 is larger than the refractive index of the base part 320. Referring to FIG. 4, since the refractive index of the pattern portion 325 is greater than the refractive index of the base portion 320, both external light and panel light incident on the pattern portion 325 according to Snell's law are absorbed by the pattern portion 325. do.

Therefore, when the upper end of the pattern portion 325 is disposed on the observer side and the refractive index of the pattern portion 325 is larger than the refractive index of the base portion 320, the ghost phenomenon may be reduced. In order to sufficiently absorb the panel light incident at an angle to the pattern portion 325 to prevent ghosting, the difference between the refractive index of the pattern portion 325 and the refractive index of the base portion 320 is preferably 0.05 or more.

When the refractive index of the pattern portion 325 is larger than the refractive index of the base portion 320, the transmittance and clear room contrast of the external light shielding sheet may be reduced, thereby preventing ghosting and greatly reducing the transmittance of the external light shielding sheet. In order not to, the difference between the refractive index of the pattern portion 325 and the refractive index of the base portion 320 is preferably 0.05 to 0.3. In addition, in order to prevent the ghost phenomenon and maintain the clear yarn coat of the panel at an appropriate level, the refractive index of the pattern portion 325 is preferably 1.0 times to 1.3 times the refractive index of the base portion 320.

5 illustrates a case where the lower end of the pattern part 345 is disposed on the observer side and the refractive index of the pattern part 345 is smaller than the refractive index of the base part 340. As illustrated in FIG. 5, the lower end of the pattern part 345 is disposed on the side of the observer to which external light is incident, so that the external light is absorbed by the lower end of the pattern part 345, thereby improving external light blocking effect. In addition, since the interval between the lower ends of the pattern portion 345 can be made larger than that shown in FIG. 4, the aperture ratio of the external light blocking sheet can be improved.

As shown in FIG. 5, the panel light emitted from the panel 350 may be reflected at the inclined surface of the pattern part 345, and may be gathered around the panel light passing through the base part 340. Therefore, the ghost phenomenon can be reduced without significantly reducing the transmittance of the external light shielding sheet.

In order to prevent the ghost phenomenon as the panel light is reflected from the inclined surface of the pattern portion 345 and passes through the base portion 340 as the center, the distance d between the panel 350 and the external light blocking sheet It is preferable that it is 1.5-3.5 mm.

6 illustrates a case where the lower end of the pattern part 365 is disposed at the observer's side and the refractive index of the pattern part 365 is greater than the refractive index of the base part 360. As shown in FIG. 6, since the refractive index of the pattern portion 365 is greater than the refractive index of the base portion 360, the panel light incident on the inclined surface of the pattern portion 365 may be absorbed by the pattern portion 365. Accordingly, since the image is displayed by the panel light passing through the base 360, the ghost phenomenon can be reduced.

In addition, since the refractive index of the pattern portion 365 is greater than the refractive index of the base portion 360, the external light absorption effect may be improved.

7 is a sectional view showing a first embodiment of the structure of the external light blocking sheet provided in the filter according to the present invention. When the thickness T of the external light shielding sheet is 20 μm to 250 μm, the manufacturing process may be easy and may have an appropriate light transmittance. In order to smoothly transmit the light emitted from the panel, the light incident from the outside is refracted to be effectively absorbed and blocked by the pattern portion 410, and to secure the sheet, the thickness T of the external light blocking sheet is 100 μm to 180 μm.

Referring to FIG. 7, the pattern part 410 formed on the base part 400 may have a triangular shape, and more preferably, may have an isosceles triangular shape. In addition, the bottom width P1 of the pattern portion 410 may be formed to 18㎛ to 36㎛, in such a case to ensure the aperture ratio for the light emitted from the panel can be smoothly emitted to the user side, blocking external light The efficiency can be maximized.

The height h of the pattern portion 410 is formed to be 80 μm to 170 μm, thereby forming an inclined surface slope capable of effectively absorbing external light and reflecting panel light in relation to the bottom width P1. Short circuit of the part 410 can be prevented.

The panel light is emitted to the user side to secure an aperture ratio for displaying a display image having an appropriate brightness, and to secure an optimal pattern part 410 inclination slope for increasing the external light blocking effect and panel light reflection efficiency, The spacing D1 between the pattern parts may be 40 μm to 90 μm, and the spacing D2 between the upper ends of the pattern parts may be 90 μm to 130 μm.

For the above reason, when the distance D1 between two adjacent pattern parts is 1.1 to 5 times the width of the lower end of the pattern part 410, an opening ratio for the display can be secured. In addition, in order to secure the aperture ratio and optimize the external light blocking effect and the panel light reflection efficiency, the distance D1 between two adjacent pattern parts may be 1.5 to 3.5 times the width of the bottom of the pattern part 410.

When the height h of the pattern portion 410 has a range of 0.89 times to 4.25 times the interval D1 between two adjacent pattern portions, external light incident at an angle from the upper side may not be incident to the panel. In addition, in order to prevent the short circuit of the pattern portion 410 and to optimize the reflection efficiency of the panel light, the height h of the pattern portion 410 may be 1.5 to 3 times the distance D1 between two adjacent pattern portions. .

In addition, when the distance D2 between the upper ends of the two pattern parts adjacent to each other is 1 to 3.25 times the distance D1 between the lower ends of the two pattern parts adjacent to each other, an aperture ratio for displaying an image having an appropriate luminance may be secured. . In addition, in order to optimize the reflection efficiency in which the panel light is totally reflected on the inclined surface of the pattern portion 410, the distance D2 between two adjacent upper ends of the pattern parts is 1.2 times the distance D1 between the lower ends of the two pattern parts adjacent to each other. To 2.5 times.

In the above, the structure of the exterior light shielding sheet according to the present invention has been described with an example in which the upper end of the pattern part 410 is disposed to the observer side, but the contents described above with reference to FIG. 7 are described in the lower part of the pattern part 410. It is applicable also when it is arrange | positioned to the observer side.

8 illustrates an embodiment of the front shape of the pattern portions formed in a row on the external light blocking sheet, and as shown, the pattern portions 500 are formed in a row at a predetermined interval on the base portion 510. desirable.

The moire phenomenon may occur by overlapping the plurality of pattern parts 510 formed at predetermined intervals on the external light blocking sheet and the black matrix, black layer, bus electrode, and partition wall formed with the predetermined pattern on the panel. . The moiré phenomenon is a low frequency pattern generated by overlapping similar lattice patterns. For example, the moiré pattern shows a wave pattern when the mosquito nets are stacked.

As illustrated in FIG. 8, by forming the plurality of pattern portions 510 at an angle, the moiré phenomenon generated by overlapping with the black matrix, the black layer, the bus electrode, the partition wall, etc. formed in the panel may be reduced.

In order to reduce the moiré phenomenon, it is preferable that the inclination angle θ1 of the plurality of pattern portions 510 is 0.5 to 20 degrees. That is, when the pattern portion 510 of the external light blocking sheet is formed obliquely with an angle between 0.5 degrees and 20 degrees with the black matrix formed on the panel, the moiré phenomenon may be reduced. In addition, considering that the external light incident on the panel is often present at the top of the user's head, the moir phenomenon is prevented and appropriate when the inclination angle θ1 of the pattern portion 510 is 0.5 to 5 degrees. The aperture ratio can be secured to increase the reflection efficiency of the panel light, and the external light can be blocked most effectively.

In addition, the moiré phenomenon may be reduced when the angle between the pattern portion 510 of the external light blocking sheet and the horizontal electrode formed on the lower substrate or the bus electrode formed on the upper substrate of the panel is 0.5 to 20 degrees. . In addition, considering that the external light incident on the panel is often present at the top of the user's head, the moiré phenomenon is prevented while the angle between the pattern portion and the bus electrode or the horizontal partition wall is 0.5 to 5 degrees. The proper aperture ratio can be secured to increase the reflection efficiency of the panel light, and the external light can be blocked most effectively.

In FIG. 8, the pattern portion 510 is formed obliquely in the upper left direction from the lower right side of the external light blocking sheet, but in another embodiment, the pattern portion 510 is described above in the lower right direction from the upper left side of the external light blocking sheet. It may be formed at an angle with the angle as shown.

9A to 14 briefly illustrate embodiments of the front shape of the exterior light shielding sheet according to the present invention.

The front face shape of the pattern portion of the exterior light shielding sheet according to the present invention preferably has a rising slope in some areas, and a falling slope in some areas. Therefore, the external light incident from the left and right sides of the panel as well as the upper and lower sides of the panel may be absorbed in the pattern part to improve the image quality of the display image.

Referring to FIG. 9A, the pattern portion 610 formed on the base portion 600 may include a portion having a rising slope and a portion having a falling slope, whereby the pattern portion 610 is at an upper side of the panel. It can absorb all the external light incident from the lower side, the right side, and the left side.

Referring to FIG. 9B, in order to effectively absorb external light incident on the panel, considering that most external light is incident from the upper side of the panel, the inclination θ2 of the rising portion of the pattern portion 611 is 0.5 to 45 degrees. It is preferable that the inclination (theta) 3 of the falling part of the pattern part 611 is -0.5 degree--45 degree.

If the inclination of the pattern portion 611 is too large, there may be a problem in that the left and right viewing angles of the panel become narrow. In order to absorb external light incident from the top, bottom, left and right sides of the panel, and to sufficiently secure the left and right viewing angles of the panel, and to sufficiently secure the aperture ratio of the panel to prevent the decrease of the brightness of the panel, the pattern portion 611 is raised. The inclination θ2 of the portion may be 0.5 degrees to 20 degrees, and the inclination θ3 of the descending portion of the pattern portion 611 may be −0.5 degrees to −20 degrees.

Therefore, when the vertical gap b between the highest point and the lowest point of the pattern portion 611 is 0.36 times or less of the horizontal distance a between the highest point and the lowest point, external light absorption efficiency, left and right viewing angles, and luminance can be improved.

Referring to FIG. 10A, in order to reduce moiré occurring between electrodes, partitions, and the like, which are formed in the panel in the vertical direction or the left and right directions, and to improve the ease of the manufacturing process of the pattern portion 630, the pattern portion 630. The front shape of h) may have a curved shape.

Referring to FIG. 10B, in order to effectively absorb external light, most of which is incident from the upper side and less from the left and right sides, the average inclination θ4 of the rising portion of the pattern portion 631 is preferably 0.5 to 45 degrees. It is preferable that the average inclination (theta) 5 of the falling part of the pattern part 631 is -0.5 degree--45 degree.

In addition, in order to absorb external light incident from the top, bottom, left, and right sides of the panel, and to sufficiently secure the left and right viewing angles of the panel, and to prevent a decrease in luminance of the image, the average slope θ4 of the rising portion of the pattern portion 631. ) May be 0.5 degrees to 20 degrees, and the average slope θ5 of the descending portion of the pattern portion 631 may be -0.5 degrees to -20 degrees.

Therefore, in order to simultaneously improve external light absorption efficiency, left and right viewing angles, and luminance, the vertical distance d between the highest point and the lowest point of the pattern portion 631 may be 0.36 times or less of the horizontal direction d.

Referring to FIG. 11A, the pattern parts 710 and 720 formed on the base part 700 may include a pattern part 720 formed in a vertical direction with the pattern part 710 formed in a horizontal direction. In addition, the vertical pattern portion 720 may connect two pattern portions in the horizontal direction adjacent to each other.

Referring to FIG. 11B, it absorbs external light incident from the top, bottom, left, and right sides of the panel, and sufficiently secures the aperture ratio of the panel to reduce the decrease in brightness of the image, and the width of the pattern portions 711, 712, and 723 is reduced. In order to make it easy to manufacture, it is preferable to make the width | variety f of the pattern part 721 of a vertical direction into the range of 0.1 times-5 times the width e of the pattern part 711 of a horizontal direction.

In general, considering that the user feels more discomfort when the left and right viewing angles are narrower than the vertical viewing angle of the panel, the width f of the pattern portion 721 in the vertical direction is equal to the width (the width of the pattern portion 711 in the horizontal direction). It is preferred to be smaller than e). Therefore, by forming the width f of the pattern portion 721 in the vertical direction at 0.3 times to 0.6 times the width e of the pattern portion 711 in the horizontal direction, the left and right viewing angles of the panel are sufficiently secured, and external light absorption efficiency and The brightness of the image can be improved.

In addition, in order to prevent the left and right viewing angles of the panel from being narrowed much, the distance g between two horizontal direction pattern parts 711 and 712 adjacent to each other is equal to the distance g between the two vertical direction pattern parts 721 and 722 adjacent to each other. Preference is given to smaller than h).

Therefore, in order to sufficiently secure the left and right viewing angles of the panel and to improve external light absorption efficiency and image brightness, the distance g between two adjacent horizontal patterns 711 and 712 is equal to two adjacent vertical patterns. It may be from 0.05 times to 0.5 times the interval h between (721, 722).

Accordingly, as described above, the distance g between the two pattern portions 711 and 712 in the two horizontal directions adjacent to each other is preferably 40 μm to 90 μm, so that the pattern portions 721 and 722 in the two vertical directions adjacent to each other. It is preferable that the space | interval h between (8) is 0.3 times the width f of the pattern part 721 of 80 micrometers-1800 micrometers vertical direction to the width e of the pattern part 711 of a horizontal direction.

Since the moiré phenomenon may occur due to the overlapping portions formed in the same pattern as described above, between the pattern portions 721, 722 and 723 in the vertical direction and the electrodes or partitions formed in the vertical direction at regular intervals in the panel. Moiré may occur at

Referring to FIG. 11B, moiré phenomena may be reduced by making the gaps g and i between two adjacent horizontal pattern parts different from each other so as not to form a predetermined pattern with electrodes or partition walls formed on the panel at regular intervals. Can be.

In addition, as shown in FIG. 12A, the pattern parts 750 and 760 in the vertical direction are inclined at an angle with a predetermined angle, thereby reducing the moiré phenomenon occurring between the electrodes or the partitions formed in the vertical direction in the panel. Can be.

Referring to FIG. 12B, in order to improve the external light absorption efficiency and the left and right viewing angles of the panel, and to reduce the occurrence of moiré phenomenon, the angle Φ 1 formed between the horizontal pattern portion 740 and the vertical pattern portion 752. Silver is preferably 45 degrees to 135 degrees. In addition, the angles Φ 1 and Φ 2 formed between the horizontal pattern portion 740 and the two vertical pattern portions 752 and 753 may be different from each other.

In addition, as shown in FIG. 13, the moiré phenomenon generated between the electrodes or the partitions in the panel by forming the horizontal pattern portion 800 and the vertical pattern portion 810 at an angle as inclined by Φ 3 and Φ 4, respectively. Can be reduced. As described above, the inclined angle Φ 3 of the pattern portion 800 in the horizontal direction may be 0.5 degrees to 20 degrees, and the inclined angle Φ 4 of the pattern portion 810 in the vertical direction is 45 degrees to 135 degrees. Can be.

Referring to FIG. 14, the moire phenomenon may be reduced by disposing the pattern parts 840 in the vertical direction as a whole.

15 to 19 illustrate cross-sectional views of embodiments of a pattern portion of an exterior light blocking sheet.

Referring to FIG. 15, the pattern portion 900 may be formed in left and right asymmetric shapes. That is, the area of the left and right inclined surfaces of the pattern unit 900 may be different from each other, or the angles of the left and right inclined surfaces may be different from each other. In general, since objects generating external light are located above the panel, external light is incident from the top of the panel to the panel within a predetermined angle range. Therefore, in order to increase the external light absorbing effect and increase the reflectance of the light emitted from the panel, the inclination of the upper inclined surface to which the external light is incident can be gentler than the inclination of the lower inclined surface of the two inclined surfaces of the pattern portion 900. That is, the inclination of the upper inclined surface of the two inclined surfaces of the pattern portion 900 may be smaller than the inclination of the lower inclined surface.

Referring to FIG. 16, the pattern portion 910 may have a trapezoidal shape, in which case, the upper width P2 is smaller than the lower width P1. In addition, the width P2 of the upper end of the pattern portion 910 may be 10 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.

17 to 19, the pattern portions 920, 930, and 940 of the external light blocking sheet may have a curved shape in which left and right inclined surfaces have a predetermined curvature. In this case, in order to improve the blocking effect of the external light incident at an angle, it is preferable that the amount of change of the inclination of the inclined surfaces of the pattern parts 920, 930, and 940 decreases from the lower end to the upper end.

In addition, in embodiments of the shape of the pattern portion illustrated in FIGS. 17 to 19, the corner portion of the pattern portion may have a curved shape having a predetermined curvature.

20 is a sectional view showing an embodiment of the shape of the pattern portion having a concave shape at the bottom.

As shown in FIG. 20, the lower end 1015 of the pattern part has a concave shape in which the center is rounded or recessed in the middle, so that the image generated as the light emitted from the panel is reflected from the lower end 1015 of the pattern part. It is possible to reduce the bleeding phenomenon of, and when the external light blocking sheet is attached to another functional sheet or panel, it is possible to improve the adhesive force by increasing the area of the bonding site.

That is, by forming the pattern portion 1010 so that the height at the center portion is smaller than the height at the outermost portion, the pattern portion 1010 including the concave lower end 1015 can be formed.

The pattern portion 1010 may be formed by filling a light absorbing material or the like in a groove formed in the base portion 1000, wherein a portion of the groove formed in the base portion 1000 forms the pattern portion 1010. Can be filled in, and the rest can be left blank. Accordingly, the lower end 1015 of the pattern portion may have a concave shape in which a center portion thereof is drawn in.

As shown in FIG. 21, when the bottom of the pattern portion 1030 is flat, light emitted from the panel and obliquely incident to the bottom of the pattern portion 1030 may be reflected in the panel direction. As described above, an image to be displayed at a specific position is displayed around the specific position by the panel light reflected in the panel direction, so that an image blur phenomenon may occur to reduce the sharpness of the display image.

Referring to FIG. 22, an incident angle θ2 of light incident obliquely to the lower end of the concave pattern portion 1010 is smaller than an incident angle θ1 incident to the lower end of the flat pattern portion 1030 shown in FIG. 21. do. Accordingly, the panel light reflected from the bottom of the flat pattern portion 1030 illustrated in FIG. 21 may be absorbed into the pattern portion 1010 at the bottom of the pattern portion 1010 having the concave shape illustrated in FIG. 22. As a result, blurring of the display image may be reduced to improve sharpness of the image.

FIG. 23 is a cross-sectional view showing an embodiment of the structure of an external light shielding sheet including a pattern portion having a concave lower end, and the lower end of the pattern portion 1110 is arranged in an observer side.

Referring to FIG. 23, the lower end of the pattern part 1110 disposed on the observer side may be concave, thereby increasing the incident angle range of external light absorbed by the lower part of the pattern part 1110. That is, when the lower end of the pattern portion 1110 is concave, the incident angle of the external light to the lower end of the pattern portion 1110 can be increased, thereby improving the external light absorption effect.

24 is a sectional view showing an embodiment of the shape of the pattern portion having a concave shape at the bottom. Table 1 below shows the results of experiments on whether or not the blurring phenomenon of the display image is reduced according to the depth (a) of the groove formed by forming the lower end of the pattern part 1210 and the width d of the lower part of the pattern part 1210. As a result, it is a result of experiment whether or not an image bleeding phenomenon is reduced compared to a plasma display panel in which an external light blocking sheet having a flat pattern portion at the bottom is disposed.

Depth of groove (a) Bottom width of pattern part (d) Reduced bleeding 0.5 μm 27 ㎛ × 1.0 μm 27 ㎛ × 1.5 μm 27 ㎛ ○ 2.0 μm 27 ㎛ ○ 2.5 μm 27 ㎛ ○ 3.0 μm 27 ㎛ ○ 3.5 ㎛ 27 ㎛ ○ 4.0 μm 27 ㎛ ○ 4.5㎛ 27 ㎛ ○ 5.0㎛ 27 ㎛ ○ 5.5㎛ 27 ㎛ ○ 6.0 μm 27 ㎛ ○ 6.5㎛ 27 ㎛ ○ 7.0㎛ 27 ㎛ ○ 7.5㎛ 27 ㎛ × 8.0㎛ 27 ㎛ × 9.0 μm 27 ㎛ × 9.5 ㎛ 27 ㎛ ×

As shown in Table 1, when the depth (a) of the groove formed in the lower end of the pattern portion 1210 is 1.5㎛ to 7.0㎛, it is possible to reduce the blurring phenomenon of the display image to improve the sharpness of the image.

In addition, considering the prevention of damage to the pattern portion 1210 due to external impact and the ease of forming the pattern portion 1210, the depth a of the groove formed at the lower end of the pattern portion 1210 is 2 μm to 5 μm. It is preferable.

As described with reference to FIG. 7, when the bottom width d of the pattern portion 1210 is 18 μm to 35 μm, the aperture ratio for panel light emission may be secured and the external light blocking efficiency may be maximized. The bottom width (d) is preferably 3.6 times to 17.5 times the depth (a) of the groove formed in the bottom of the pattern portion 1210.

On the other hand, when the height c of the pattern portion 1210 is 80 μm to 170 μm, an inclined surface slope capable of effectively absorbing external light and reflecting panel light can be formed, so that the height c of the pattern portion 1210 is increased. The depth of the groove formed in the lower end of the pattern portion 1210 is preferably 16 times to 85 times.

In addition, when the thickness (b) of the external light blocking sheet is 100 μm to 180 μm, smooth transmission of panel light and effective absorption and blocking of external light can be achieved, and the firmness of the sheet can be secured, and thus the thickness (b) of the external light blocking sheet ) Is preferably 20 to 90 times the depth (a) of the groove formed in the lower end of the pattern portion 1210.

Referring to FIG. 25, the pattern portion 1230 may have a trapezoidal shape, and in this case, the width e of the upper end is preferably smaller than the width d of the lower end. In addition, when the width e of the upper end of the pattern portion 1230 is 10 μm or less, an inclined surface slope capable of effectively absorbing external light and reflecting panel light may be formed in relation to the lower width d. Even in this case, the relationship between the depth a of the groove formed in the lower end of the pattern part 1230 and the lower width d of the pattern part 1230 may be the same as described with reference to FIG. 24.

FIG. 26 is a cross-sectional view showing the structure of the external light blocking sheet in order to explain the relationship between the thickness of the external light blocking sheet and the height of the pattern portion.

Referring to FIG. 26, 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. 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 external light incident on the panel even with a predetermined angle of incidence θ, the ratio of the height h of the pattern portion to the thickness T of the external light blocking sheet preferably has a value within a certain range.

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 breakage may occur. It may not be blocked properly.

Table 2 below shows the results of experiments of insulation breakdown and external light blocking effects 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 height (h) Dielectric breakdown Exterior light blocking 120 μm 120 μm ○ ○ 120 μm 115 ㎛ △ ○ 120 μm 110 ㎛ × ○ 120 μm 105㎛ × ○ 120 μm 100 μm × ○ 120 μm 95 ㎛ × ○ 120 μm 90 μm × ○ 120 μm 85 μm × △ 120 μm 80㎛ × △ 120 μm 75 μm × △ 120 μm 70 ㎛ × △ 120 μm 65 μm × △ 120 μm 60㎛ × △ 120 μm 55 μm × △ 120 μm 50 μm × ×

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 115 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 85 μm or less, the efficiency of blocking external light by the pattern portion may be reduced, and when formed to 60 μm or less, external light may be incident on the panel. Accordingly, when the height h of the pattern portion is 90 μm to 110 μm, the external light blocking efficiency of the external light shielding sheet may be increased and the defective rate may be reduced.

In addition, when the thickness T of the external light shielding sheet is 1.01 to 2.25 times the height of the pattern portion, insulation breakdown of the upper portion of the pattern portion may be prevented, and external light may 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 shielding sheet is 1.01 times to 1.5 times the height of the pattern portion. It may be a boat.

Table 3 below shows the results of experiments on whether moiré occurred 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 bus electrode formed on the upper substrate of the panel. If

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 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 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 bottom width of the pattern portion is 0.3 times to 0.8 times the top width of the vertical partition wall, it is possible to reduce the moiré 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, it is preferable that the bottom width of the pattern portion is 0.4 times to 0.65 times the top width of the vertical partition wall.

27 to 30 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 sheet. And the like.

Referring to FIGS. 27 and 28, the AR / NIR sheet 1310 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 1313 made of a transparent plastic material. (Anti-Reflection) layer 1311 is attached to the rear, shielding the near infrared rays emitted from the panel to the NIR (Near Infrared) shielding sheet (1312) so that signals transmitted using infrared rays such as a remote control can be normally transmitted. Is attached.

The EMI shield sheet 1320 has an EMI shield sheet 1321 attached to a front surface of the base sheet 1322 made of a transparent plastic material to shield electromagnetic interference (EMI) from being emitted from the panel to the outside. . In this case, the EMI shield sheet 1321 is typically formed of a mesh structure using a conductive material, and the ratio of the EMI shield sheet 1320 without an image to be smoothly grounded is achieved. 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 1330 is attached to effectively block the external light so that the black image of the plasma display panel can be darker.

The adhesive 1340 forms a layer between the AR / NIR sheet 1310, the EMI shielding sheet 1320, and the external light shielding sheet 1330, and thus, the sheets 1310, 1320, 1330, and the filter 1300. ) To be firmly attached to the front of the panel. In addition, the material of the base sheet included between each of the sheets 1310, 1320, and 1330 may preferably use substantially the same material in consideration of the ease of fabrication of the filter 1300.

Meanwhile, in FIG. 27, the AR / NIR sheet 1310, the EMI shielding sheet 1320, and the external light shielding sheet 1330 are stacked in this order. As illustrated in FIG. 28, the AR / NIR sheet 1310 and the external light blocking are shown. As the sheet 1330 and the EMI shielding sheet 1320 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 of the illustrated sheets 1310, 1320, 1330 may be omitted.

29 and 30, the filter 1400 formed on the front of the panel may further include an optical sheet 1420 in addition to the AR / NIR sheet 1410, the EMI shield sheet 1430, and the external light shield sheet 1440. It may include. The optical sheet 1420 improves the color temperature and luminance characteristics of the light incident from the panel, and the optical layer 1421 formed of a predetermined dye and an adhesive is laminated on the front or rear surface of the base sheet 1422 made of a transparent plastic material. do.

At least one of the basesheets shown in FIGS. 27 to 30 may be omitted, and any one of the basesheets may be made of hard glass, not plastic, to protect the panel. You can. The glass is preferably formed spaced apart from the panel at a predetermined interval.

In addition, the filter according to the present invention may further include a diffusion sheet. The diffusion sheet serves to diffuse the incident light so that the light maintains uniform brightness. Accordingly, the diffusion sheet can uniformly diffuse the light emitted from the panel to widen the vertical viewing angle of the display screen, and conceal the pattern formed in the external light blocking sheet or the like. In addition, the diffusion sheet can condense light in the direction corresponding to the vertical viewing angle to make the front luminance uniform and at the same time improve antistatic property.

The diffusion sheet may be a transmissive or reflective diffusion film and the like, and generally may have a form in which small glass bead grains are mixed with a base sheet of a polymer material. In addition, high purity acrylic resin (PMMA) may be used as the base sheet of the diffusion sheet, and when the high purity acrylic resin (PMMA) is used, the sheet may have a thick thickness but good heat resistance, and thus may be used in a large display device having high heat generation.

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. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

1 is a perspective view illustrating an embodiment of a structure of a plasma display panel.

2 is a cross-sectional view showing an embodiment of a schematic cross-sectional structure of an external light blocking sheet according to the present invention.

3 to 6 are cross-sectional views showing optical characteristics according to the structure of the external light blocking sheet.

It is sectional drawing which shows 1st Example about the shape of the pattern part of an exterior light shielding sheet.

8 is a view showing an embodiment of the front shape of the pattern portion formed in a line on the external light blocking sheet.

9A to 14 are views briefly showing embodiments of the front shape of the exterior light shielding sheet according to the present invention.

15 to 19 are cross-sectional views showing second to seventh embodiments of the pattern portion shape of the external light blocking sheet.

20 to 25 are cross-sectional views illustrating embodiments of a cross-sectional shape of a pattern portion having a concave shape at its lower end and optical characteristics thereof.

It is sectional drawing for demonstrating the relationship between the space | interval between the adjacent pattern parts formed in the exterior light shielding sheet, and the height of a pattern part.

27 to 30 are cross-sectional views showing embodiments of the structure of the filter including the external light blocking sheet.

Claims (24)

A plasma display panel; And Located on the front of the panel, and includes a light blocking sheet including a base portion and a plurality of pattern portions formed on the base portion to absorb external light, The front surface of at least one of the plurality of pattern portions includes a rising portion rising with an average slope of 0.5 degrees to 45 degrees and a falling portion falling with an average slope of -45 degrees to -0.5 degrees. . The method of claim 1, And an average slope of the rising part is in the range of 0.5 to 20 degrees. The method of claim 1, The average slope of the lower portion is -20 degrees to -0.5 degrees plasma display device, characterized in that. The method of claim 1, The slope of any one of the rising portion and the falling portion has a value of two or more plasma display device. The method of claim 1, And the vertical gap between the highest point and the lowest point of the pattern portion is 0.36 times or less of the horizontal direction. The method of claim 1, The pattern portion has a larger refractive index than the base portion, and the difference between the refractive index of the base portion and the pattern portion is a plasma display device, characterized in that 0.05 to 0.3. The method of claim 1, And a refractive index of the pattern portion is 1.0 to 1.3 times the refractive index of the base portion. The method of claim 1, And an upper end of an upper end of the pattern portion and a lower end of a width larger than the upper end of the pattern part to be adjacent to the panel. A plasma display panel; And Located on the front of the panel, and includes a light blocking sheet including a base portion and a plurality of pattern portions formed on the base portion to absorb external light, The external light blocking sheet A first pattern portion and a second pattern portion formed adjacent to each other in a parallel direction; And A third pattern part which is formed in a direction crossing the first and second pattern parts and connects the first and second pattern parts, The width of the third pattern portion is smaller than the width of the first pattern portion plasma display device. The method of claim 9, And an angle between the first pattern portion and the third pattern portion is 45 degrees to 135 degrees. The method of claim 9, The width of the third pattern portion is a plasma display device, characterized in that 0.1 to 5 times the width of the first pattern portion. delete The method of claim 9, And the width of the third pattern portion is 0.3 to 0.6 times the width of the first pattern portion. The method of claim 9, The width of the third pattern portion is a plasma display device, characterized in that 5.4㎛ to 35㎛. The method of claim 9, The external light blocking sheet further includes a fourth pattern portion formed adjacent to the third pattern portion to connect the first and second pattern portions. The space between the first and second pattern portions formed in the horizontal direction is smaller than the space between the third and fourth pattern portions. The method of claim 15, And the interval between the first and second pattern portions is 0.05 to 0.5 times the interval between the third and fourth pattern portions. The method of claim 15, The interval between the third and fourth pattern portion is a plasma display device, characterized in that 80㎛ to 1800㎛. The method of claim 9, The external light blocking sheet A fourth pattern portion formed adjacent to the third pattern portion and connecting the first and second pattern portions; And And a fifth pattern part and a sixth pattern part which are formed adjacent to each other in a direction crossing the first and second pattern parts and connect the first and second pattern parts. And the spacing between the third and fourth pattern portions is different from the spacing between the fifth and six pattern portions. The method of claim 9, The pattern portion has a larger refractive index than the base portion, and the difference between the refractive index of the base portion and the pattern portion is a plasma display device, characterized in that 0.05 to 0.3. The method of claim 9, And a refractive index of the pattern portion is 1.0 to 1.3 times the refractive index of the base portion. The method of claim 9, And an upper end of an upper end of the pattern part and a lower end of a width larger than the upper end of the pattern part to be adjacent to the panel. A base portion; And a plurality of pattern portions formed on the base portion to absorb external light, At least one front surface of the plurality of pattern portions may include a rising portion rising with an average slope of 0.5 degrees to 45 degrees and a falling portion falling with an average slope of -45 degrees to -0.5 degrees. . A base portion; And A plurality of pattern portions formed on the base portion to absorb external light, The plurality of pattern portions A first pattern portion and a second pattern portion formed adjacent to each other in a parallel direction; And A third pattern part which is formed in a direction crossing the first and second pattern parts and connects the first and second pattern parts, The width of the third pattern portion is less than the width of the first pattern portion, the external light blocking sheet. The method of claim 23, wherein An external light blocking sheet, wherein the angle between the first pattern portion and the third pattern portion is 45 degrees to 90 degrees.

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