KR20090021824A - Filter and display device thereof - Google Patents

Abstract

A filter and a display device using the same are provided to improve the bright room contrast by positioning the external light interception sheet in front side of the display panel. A filter comprises an electromagnetic interference shielding sheet(730) and an external light interception sheet(700). The electromagnetic interference shielding sheet is formed on the external light interception sheet. An adhesion layer(740) is formed between the external light interception sheet and the electromagnetic interference shielding sheet. The visible light transmission rate of the filter is 35% or greater. The surface resistance of the electromagnetic interference shielding sheet is less than 2Ф/sq.

Description

Filter and display device using the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a display panel and a display device using the same, and more particularly, to a filter and a display device using the same that block external light incident from the outside of the panel and block electromagnetic waves emitted from the panel.

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.

In addition, electromagnetic waves or near-infrared rays generated from the display panel may adversely affect the human body and cause malfunctions of precision devices such as a wireless telephone or a remote controller.

SUMMARY OF THE INVENTION 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 contrast and improving brightness of the panel, and reducing moire. It is an object of the present invention to provide a filter and a plasma display device using the same.

The filter according to the present invention for solving the above technical problem, the electromagnetic shielding sheet is laminated with a transparent layer and a metal layer having conductivity; And a base portion; And an external light blocking sheet formed on the base part and including a plurality of pattern parts absorbing external light, wherein the combination of the transparent layer and the metal layer is repeated three to five times, and two adjacent ones of the plurality of pattern parts are provided. The interval between the pattern portions is 2 to 5 times the width of the lower end of the pattern portion, the visible light transmittance of the filter is characterized in that more than 35%.

Another filter according to the present invention for solving the above technical problem is an electromagnetic shielding sheet in which a combination of a transparent layer and a metal layer having conductivity is laminated two or more times; And a base portion; And an external light blocking sheet formed on the base part to absorb external light, wherein the external light blocking sheet includes an average thickness t1 of the metal layer and a distance D1 between two pattern parts adjacent to each other among the plurality of pattern parts. ) And the bottom width P1 of the pattern portion satisfy the following equation.

Display device according to the present invention for solving the above technical problem is a display panel; And the filter disposed at the front of the panel.

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. In addition, by using the external light shielding sheet together with the electromagnetic shielding film in which a plurality of metal layers and conductive transparent layers are repeatedly stacked, the moiré phenomenon may be reduced simultaneously with external light blocking, and the brightness and clarity of the display image may be improved. .

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 to 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 to be physically connected. have.

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, and 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 10 nm to 10 μm. In addition, in order to effectively absorb external light refracted by the pattern portion 210, the pattern portion 210 may include 0.5 wt% or more of light absorbing particles. That is, light absorbing particles having a weight of 0.5% or more of the total weight of the pattern portion 210 may be included in the pattern portion 210.

3 to 6 illustrate cross-sectional views of embodiments of the structure of the external light blocking sheet in order 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 the 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 than the refractive index of the base part 300. It is preferable that it is less than. 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 blocking sheet is 10 μm to 180 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 10㎛ 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, the external light blocking efficiency Can be maximized.

The height h of the pattern portion 410 may be formed to have a thickness of 30 μm to 180 μm to form an inclined surface slope capable of effectively absorbing external light and reflecting panel light in a relationship with 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 10 μm to 90 μm, and the spacing D2 between the upper ends of the pattern parts may be 30 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.

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 short circuit of the pattern portion 410 and to optimize 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 below. It is applicable also when it is arrange | positioned to the observer side.

As described above, the moiré phenomenon is formed by overlapping a plurality of pattern portions formed at predetermined intervals on the external light shielding sheet and portions formed with a predetermined pattern on the panel such as a black matrix, a black layer, a bus electrode, a partition wall, and the like. It can happen. 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.

By forming the pattern portions of the external light blocking sheet at an angle, the moiré phenomenon generated by overlapping with the black matrix, the black layer, the bus electrode, and the partition wall formed in the panel can be reduced.

When the pattern portion 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 can be reduced. In addition, considering that the external light incident on the panel is often present at the top of the user's head, when the angle between the pattern portion and the black matrix is 0.5 degrees to 5 degrees, the moir phenomenon is prevented and an appropriate aperture ratio is secured. It is possible to increase the reflection efficiency of the panel light and to block the external light most effectively.

8 and 9 are sectional views showing embodiments of the structure of the filter including the electromagnetic shielding sheet and the external light shielding sheet, the filter according to the present invention is AR / NIR sheet, EMI shielding sheet, external light shielding sheet, light Property sheets and the like.

8 and 9, the AR / NIR sheet 510 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 513 made of a transparent plastic material. (Anti-Reflection) layer 511 is attached to the rear, shielding the near-infrared radiation emitted from the panel to the NIR (Near Infrared) shielding sheet 512 to ensure that the signals transmitted using infrared rays, such as a remote control, can be transmitted normally Can be attached.

The EMI shield sheet 520 shields the electromagnetic interference (EMI) to prevent the EMI emitted from the panel from being emitted to the outside, and the plurality of conductive layers, for example, the plurality of metal layers and the transparent transparent layers alternately. It may have a stacked structure. The structure of the EMI shielding sheet 520 according to the present invention will be described in detail with reference to FIGS. 10 to 14.

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 330 is attached to effectively block the external light so that the black image of the display panel can be darker.

An adhesive layer 540 is formed between the AR / NIR sheet 510, the EMI shield sheet 520, and the external light shielding sheet 530, so that the sheets 510, 520, 530, and the filter 500 are panels. Make sure that it is firmly attached to the front of the unit. In addition, the material of the base sheet included between each of the sheets 510, 520, and 530 is preferably used in consideration of the ease of fabrication of the filter 500.

Meanwhile, in FIG. 8, the AR / NIR sheet 510, the EMI shielding sheet 520, and the external light blocking sheet 530 are stacked in this order. As illustrated in FIG. 9, the AR / NIR sheet 510 and the external light blocking are shown. As the sheet 530 and the EMI shielding sheet 520 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 510, 520, 530 may be omitted.

In addition, the filter according to the present invention may further include an optical characteristic sheet (not shown). The optical sheet (not shown) improves the color temperature and luminance characteristics of the light incident from the panel, and an optical layer composed of a predetermined dye or pigment and an adhesive is laminated on the front or rear surface of the base sheet made of a transparent plastic material.

At least one of the basesheets shown in FIGS. 8 to 9 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.

As the diffusion sheet, a transmissive or reflective diffusion film may be used. In general, the diffusion sheet may have a form in which small glass beads are mixed in 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.

The filter including the external light blocking sheet according to the present invention as described above may be formed as a film filter type to be attached to the panel using the adhesion, in contrast to the glass filter type is spaced apart from the panel including the glass Can also be formed.

10 and 11 illustrate sectional views of embodiments of the structure of the electromagnetic shielding sheet.

Referring to FIG. 10, the electromagnetic shielding sheet according to the present invention may include a plurality of metal layers 610, 611, 612, and 613 and a plurality of transparent layers 600, 601, 602, 603, and 620 having conductivity. have. That is, the electromagnetic shielding sheet according to the present invention may have a structure in which a combination of a metal layer and a transparent layer is repeated and laminated.

10 illustrates an electromagnetic shielding sheet in which a combination of a metal layer and a transparent layer is laminated four times, which is an embodiment of the electromagnetic shielding sheet structure according to the present invention. The combination of the metal layer and the transparent layer may be repeated and stacked more than once.

As shown in FIG. 10, the uppermost layer of the electromagnetic shielding sheet, that is, the layer located farthest from the display panel, is the transparent layer 620.

The transparent layers 600, 601, 602, 603, and 620 have conductivity to increase the electromagnetic wave absorption efficiency, and preferably have transparency to transmit visible light to improve the visible light transmittance of the electromagnetic shielding sheet. Materials of the transparent layers 600, 601, 602, 603, and 620 include indium (In), titanium (Ti), niobium (Nb), zirconium (Zr), bismuth (Bi), tin (Sn), and zinc (Zn). , Oxides such as antimony (Sb), tantalum (Ta), cerium (Ce), neodium (Nd), lanthanum (La), thorium (Th), magnesium (Mg), potassium (K), mixtures of these oxides, Zinc sulfide and the like can be used. In addition, in order to prevent visible light from being reflected from the contact surfaces of the transparent layers 600, 601, 602, 603, 620 and the metal layers 610, 611, 612, 613, the transparent layers 600, 601, 602, 603, 620 The refractive index may be greater than that of the metal layers 610, 611, 612, and 613. For example, the refractive index of the transparent layers 600, 601, 602, 603, and 620 may be 1.6 or more.

As the material of the metal layers 610, 611, 612, and 613, an alloy in which silver (Ag) or silver (Ag) is mixed with metals such as gold, platinum, palladium, copper, indium, and tin may be used.

Each of the transparent layers 600, 601, 602, 603, and 620 may be made of different materials, and each of the metal layers 610, 611, 612, and 613 may be made of different materials.

Referring to FIG. 11, the electromagnetic wave shielding sheet according to the present invention includes a protective layer 650, 651, 652, 653, between the transparent layers 630, 631, 632, 633, 634 and the metal layers 640, 641, 642, 643. 654, 655, 656, 657.

The protective layers 650, 651, 652, 653, 654, 655, 656, 657 are transparent layers 630, 631, 632, 633, 634 and metal layers 640, 641, 642, 643 from damage by external pressure or the like. ), So that the electrical or optical properties of the plurality of layers are not changed, and the adhesion between the transparent layers 630, 631, 632, 633, 634 and the metal layers 640, 641, 642, 643 is improved. You can.

In addition, the protective layers 650, 651, 652, 653, 654, 655, 656, 657 can improve the electric wave shielding effect by improving the electrical conductivity of the metal layers, by suppressing the plasmon generated between the metal layer and the transparent layer The visible light loss due to the plasmon can be reduced, and damage to the metal layer by the oxygen plasma can be prevented.

The protective layers 650, 651, 652, 653, 654, 655, 656, and 657 include copper (Cu), nickel (Ni), chromium (Cr), gold (Au), platinum (Pt), and zinc ( Zn), zirconium (Zr), titanium (Ti), tungsten (W), tin (Sn), palladium (Pd), oxides of the materials or alloys of the materials may be used.

As a method of repeatedly laminating a transparent layer and a metal layer or a combination of a transparent layer, a protective layer, and a metal layer as described above, laminating a plurality of layers such as sputtering, ion plating, vacuum deposition, plating, and the like Various methods can be used.

The thickness t1 of the metal layers 640, 641, 642, and 643 may have a range of 5 nm to 40 nm in order not to significantly reduce the electromagnetic wave and the near infrared shielding effect and to sufficiently secure the transmittance of visible light.

In addition, when the thickness t2 of the transparent layers 630, 631, 632, 633, and 634 is 15 nm to 60 nm, it is possible to improve the transmittance of visible light and to prevent visible light from being reflected on the surface of the transparent layer.

The protective layers 650, 651, 652, 653, 654, 655, 656, and 657 may be thinly formed to have a thickness of 2 nm to 8 nm so as not to change the conductive and optical characteristics of the metal layer and the transparent layer.

As shown in FIG. 11, the plurality of metal layers, the transparent layers, and the protective layers as described above may be stacked on the base sheet 660. In addition, at least one of the passivation layers 650, 651, 652, 653, 654, 655, 656, and 657 illustrated in FIG. 11 may be omitted.

12 is a sectional view showing embodiments of the structure of the electromagnetic shielding sheet and the external light blocking sheet according to the present invention.

Referring to FIG. 12, an electromagnetic wave shielding sheet 730 is formed on the external light blocking sheet 700, and an adhesive layer 740 is formed between the external light blocking sheet 700 and the electromagnetic wave shielding sheet 730. As described above, the positions of the external light blocking sheet 700 and the electromagnetic shielding sheet 730 can be changed. That is, the exterior light shielding sheet 700 and the electromagnetic shielding sheet 700 of the electromagnetic shielding sheet 730 may be disposed closer to the panel, or vice versa, the electromagnetic shielding sheet 730 may be disposed closer to the panel. . In addition, the number of repeated laminations of the combination of the metal layer, the transparent layer and the protective layer may be two or more times.

In order to prevent deterioration of the image quality, brightness and sharpness of the display image, the visible light transmittance of the filter is preferably 35% or more, and more preferably 45% or more for high quality image display.

Table 1 below shows the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 as shown in FIG. 12. The two adjacent pattern parts 710 and 720 of the external light shielding sheet 700 are shown. It is the result of measuring by changing the space | interval (D1) between.

Table 2 below shows the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 as shown in FIG. 12, and the lower width P1 of the pattern portion 710 of the external light shielding sheet 700. This is the result of measuring by changing.

Referring to Tables 1 and 2, since the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 as shown in FIG. 12 is 35% or more, the interval D1 of the pattern portion is It is preferable that it is 1.4 times or more of the pattern part lower end width P1. Moreover, in order for the visible light transmittance of a filter to be 45% or more, it is preferable that the space | interval D1 of a pattern part is 2 times or more of the pattern part lower end width P1.

Considering that external light enters the panel with an angle of incidence of 30 to 60 degrees from the upper side of the panel, when the distance D1 of the pattern portion is 3.5 times or less of the pattern width lower portion P1, the external light is the external light blocking sheet 700. Both of the pattern portions 710 and 720 may be absorbed.

Therefore, in order to maintain the visible light transmittance of the filter including the external light blocking sheet 700 and the electromagnetic wave shielding sheet 730 at 35% or more and to improve the external light absorption efficiency of the filter, the interval D1 of the pattern portion is the width of the lower portion of the pattern portion. It may be 1.4 to 3.5 times (P1).

Table 3 below shows the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 as shown in FIG. 12. The thickness t1 of the metal layer 731 of the electromagnetic shielding sheet 730 is changed. It is a measurement result.

Referring to Table 3, since the visible light transmittance of the filter including the external light blocking sheet 700 and the electromagnetic shielding sheet 730 as shown in FIG. 12 is 35% or more, the thickness t1 of the metal layer 731 is 30. It is preferable that it is nm or less. In addition, in order for the visible light transmittance of a filter to be 45% or more, it is preferable that the thickness t1 of the metal layer 731 is 20 nm or less.

In order to facilitate the formation process of the metal layer 731 and not to reduce the electromagnetic wave and the near-infrared shielding effect of the metal layer 731, it is preferable that the thickness t1 of the metal layer 731 is 10 nm or more.

When the surface of the metal layer 731 is not uniform, the thickness t1 of the metal layer 731 may mean an average value of the thickness of the metal layer 731.

Referring to the visible light transmittance measurement results shown in Table 1, Table 2, and Table 3, the visible light transmittance of the filter including the external light blocking sheet 700 and the electromagnetic shielding sheet 730 is proportional to the interval (D1) of the pattern portion, It can be seen that it is inversely proportional to the bottom bottom width P1 and the thickness t1 of the metal layer 731.

Table 4 below shows the visible light transmittance of the filter according to the pattern part spacing D1 / (pattern bottom width P1 × metal layer thickness t1) using the measurement results of Table 3, and FIG. The measurement results shown in Table 4 are shown graphically.

Referring to Table 4 and FIG. 13, it can be seen that the visible light transmittance of the filter decreases as the pattern portion spacing D1 / (pattern portion bottom width P1 × metal layer thickness t1) decreases.

Since the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 as shown in FIG. 12 is 35% or more, the pattern part spacing D1 / (pattern part bottom width P1 × The metal layer thickness t1) preferably has a value of 0.067 (1 / nm) or more. In addition, in order for the visible light transmittance of a filter to be 45% or more, it is preferable that pattern part space | interval D1 / (pattern part lower end width P1 x metal layer thickness t1) has a value of 0.1 (1 / nm) or more.

In addition, as described above, the interval D1 of the pattern portion is 3.5 times or less than the lower portion width P1 of the pattern portion, and the thickness t1 of the metal layer 731 is preferably 10 nm or more, so that electromagnetic wave and near-infrared shielding effects are provided accordingly. It is preferable that the pattern part spacing D1 / (pattern lower end width P1 x metal layer thickness t1) has a value of 0.35 (1 / nm) or less in order to improve external light shielding efficiency while not significantly reducing.

Table 5 below shows the results of measuring the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 and the sheet resistance of the electromagnetic shielding sheet 730 according to the repeated stacking times of the metal layer and the transparent layer combination. will be.

Referring to Table 5, it can be seen that the sheet resistance of the filter and the visible light transmittance decrease as the number of repeated stacking of the metal layer and the transparent layer combination increases. Since the visible light transmittance of the filter is 35% or more, the number of repeated stackings of the metal layer and the transparent layer combination is preferably 5 or less.

When the sheet resistance of the electromagnetic shielding sheet 730 is increased, the conductivity of the electromagnetic shielding sheet 730 may be reduced, thereby lowering the electromagnetic shielding efficiency. Therefore, in order to improve the electromagnetic shielding efficiency of the electromagnetic shielding sheet 730, the sheet resistance of the electromagnetic shielding sheet 730 preferably has a value of 2Ω / sq or less.

Accordingly, in order to maintain the visible light transmittance of the filter including the external light shielding sheet 700 and the electromagnetic shielding sheet 730 at 35% or more and the sheet resistance of the electromagnetic shielding sheet 730 to 2? / Sq or less, It is preferable that the transparent layer combination is repeatedly laminated three to five times.

14 is a sectional view showing another embodiment of the structure of the electromagnetic shielding sheet.

As illustrated in FIG. 14, the thicknesses t11, t12, t13, and t14 of the metal layers 810, 811, 812, and 813 of the electromagnetic shielding sheet may be different from each other, and the plurality of transparent layers 800, The thicknesses of 801, 802, 803, 804 may also be different from one another. In this case, the thickness t1 of the metal layer may mean an average value of the thicknesses t11, t12, t13, and t14.

In addition, in order to reduce reflectance of visible light emitted from the display panel, the thickness t22 of the metal layer 810 closest to the panel among the plurality of metal layers 810, 811, 812, and 813 may be smaller than the thickness of the remaining metal layers. The thickness of the transparent layer 800 closest to the panel among the plurality of transparent layers 800, 801, 802, 803, and 804 may be smaller than the thickness of the remaining transparent layers.

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 a relationship with the lower width P1. .

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 incidence angle range of external light absorbed by the lower end of the pattern part 1110 may be enlarged by concave the lower end of the pattern part 1110 disposed on the observer side. 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 6 below shows the results of experiments to determine whether the display image is reduced in accordance with the depth (a) of the groove formed by forming the bottom of the pattern portion 1210 in a concave shape and the bottom width (d) of the pattern portion 1210. As a result, it is a result of experiment whether or not the blurring phenomenon of the image is reduced compared to the plasma display panel in which the external light blocking sheet having the 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 6, 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 7 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 7, 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 8 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 lower portion of the pattern portion of the external light shielding 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 8, when the width of the lower end of the pattern portion is 0.2 times to 0.5 times the width of the bus electrode, it is possible to reduce the moiré phenomenon and reduce 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 9 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 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 9, 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.

In the above, the filter according to the present invention has been described as an embodiment, which is disposed on the front surface of the plasma display panel. It can be used for various display devices.

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 to the branches. 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 and 9 are cross-sectional views showing embodiments of the structure of the filter including the electromagnetic shielding sheet and the external light blocking sheet.

10 and 11 are cross-sectional views showing embodiments of the structure of the electromagnetic shielding sheet.

12 is a cross-sectional view showing embodiments of the structure of the electromagnetic shielding sheet and the external light blocking sheet according to the present invention.

13 is a graph showing the results of experiments on the visible light transmittance of the electromagnetic shielding sheet and the external light blocking sheet according to the present invention.

14 is a cross-sectional view showing still another embodiment of the structure of the electromagnetic shielding sheet.

15 to 19 are cross-sectional views illustrating 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.

Claims (20)

In the filter for display panel, An electromagnetic shielding sheet having a conductive transparent layer and a metal layer laminated thereon; And A base portion; And an external light blocking sheet formed on the base part and including a plurality of pattern parts absorbing external light. The combination of the transparent layer and the metal layer is repeated three to five times, and the spacing between two adjacent pattern parts of the plurality of pattern parts is 1.4 times to 3.5 times the width of the lower end of the pattern part, and the visible light transmittance of the filter is 35%. The filter characterized by the above. The method of claim 1, And a visible light transmittance of the filter is 45% or more. The method of claim 1, The sheet resistance of the electromagnetic shielding sheet is a filter, characterized in that less than 2Ω / sq. The method of claim 1, The average thickness of the metal layer is a filter, characterized in that 10nm to 30nm. The method of claim 1, The interval between the two adjacent pattern portion of the plurality of pattern portion is characterized in that the filter is 40㎛ to 90㎛. The method of claim 1, The thickness of the external light shielding sheet is a filter, characterized in that 1.01 times to 2.25 times the height of the pattern portion. The method of claim 1, The refractive index of the pattern portion is a filter, characterized in that more than 0.3 times less than 1 times the refractive index of the base portion. The method of claim 1, The refractive index of the pattern portion is a filter, characterized in that 1 to 1.3 times the refractive index of the base portion. The method of claim 1, The difference between the refractive index of the pattern portion and the refractive index of the base portion is a filter, characterized in that 0.05 to 0.3. In the filter for display panel, An electromagnetic shielding sheet in which a combination of a transparent layer and a metal layer having conductivity is laminated two or more times; And A base portion; And an external light blocking sheet formed on the base part and including a plurality of pattern parts absorbing external light. And an average thickness t1 of the metal layer, a distance D1 between two adjacent pattern parts among the plurality of pattern parts, and a bottom width P1 of the pattern part satisfy the following equation.

The method of claim 10, And an average thickness t1 of the metal layer, a distance D1 between two adjacent pattern parts among the plurality of pattern parts, and a bottom width P1 of the pattern part satisfy the following equation.

The method of claim 10, The average thickness of the metal layer is a filter, characterized in that 10nm to 30nm. The method of claim 10, The average thickness of the transparent layer is a filter, characterized in that from 15nm to 60nm. The method of claim 10, Further comprising a protective layer formed between the transparent layer and the metal layer, The average thickness of the protective layer is a filter, characterized in that 2nm to 8nm. The method of claim 10, The electromagnetic shielding sheet is a filter, characterized in that the combination of the transparent layer and the metal layer is repeated three to five times. The method of claim 10, The sheet resistance of the electromagnetic shielding sheet is a filter, characterized in that less than 2Ω / sq. The method of claim 10, And the refractive index of the pattern portion is greater than the refractive index of the base portion. The method of claim 10, The refractive index of the pattern portion is a filter, characterized in that 1 to 1.3 times the refractive index of the base portion. The display device in which the filter of any one of Claims 1-18 is arrange | positioned in the front of a display panel. The method of claim 19, The filter includes a base portion; And an external light blocking sheet formed on the base part and including a plurality of pattern parts absorbing external light. And a narrower lower end of the upper and lower ends of the pattern part is disposed closer to the panel.

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