KR101448876B1 - Filter and plasma display device having it - Google Patents

Abstract

In the filter and the plasma display device having the filter of the present invention, at least one of the base portion and the film layer of the filter includes a plurality of diffusion beads. Accordingly, it is possible to uniformly diffuse the light emitted from the panel to uniformly improve the brightness of the display image, widen the vertical viewing angle of the plasma display panel, and conceal a pattern formed on the external light shielding sheet or the like.

PDP, bright room contrast, filter, brightness, external light shielding sheet, film layer, bead

Description

[0001] The present invention relates to a filter and a plasma display device having the same,

The present invention relates to a plasma display device, and more particularly, to a plasma display device including a plurality of diffusion beads in at least one of a base portion and a film layer to uniformly diffuse light emitted from the panel, To a plasma display device.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plasma display apparatus, and more particularly, to an external light shielding sheet for preventing external light incident from the outside of a panel, And maintains luminance at the same time.

2. Description of the Related Art Generally, a plasma display panel (PDP) is a device for displaying an image including a character or a graphic by causing a discharge by applying a predetermined voltage to electrodes provided in a discharge space and causing a plasma generated during a gas discharge to excite the phosphor , It is easy to make it larger and lighter and flattened, and it has a merit that a wide viewing angle is provided up and down and right and left, and full color and high brightness can be realized.

However, in the plasma display panel according to the related art, external light is reflected from the front surface of the panel due to the phosphor of the white system exposed to the bottom plate of the panel when implementing a black image, , The bright room contrast is lowered, the upper and lower viewing angles of the display screen are narrow, and the pattern formed on the external light shielding sheet is exposed to the outside.

An object of the present invention is to provide a filter capable of uniformly diffusing light emitted from a panel by including a plurality of diffusion beads in at least one of a base portion and a film layer, and a plasma display device using the same .

A filter and a plasma display device having the same according to the present invention include a base, a plurality of pattern units formed on the base unit to absorb external light, and a film layer formed on at least one surface of the base, And at least one of the base portion and the film layer includes a plurality of diffusion beads. At this time, the average diameter of the plurality of diffusion beads may be 3.0 탆 to 10 탆.

In the present invention, the base portion may be integrally coated with the plurality of diffusion beads, and the base portion may be melt-mixed with the plurality of diffusion beads to be formed by extrusion molding.

In the present invention, the film layer may be integrally coated with the plurality of diffusion beads.

In the present invention, a coating layer may be formed on one side of the film layer, and the coating layer may include the plurality of diffusion beads.

In the present invention, it may further include at least one of an AR layer preventing reflection of external light, a NIR shielding layer shielding near-infrared rays radiated from the panel, and an EMI shielding layer shielding electromagnetic waves.

In the filter and the plasma display device having the filter according to the present invention, the plurality of diffusion beads are included in at least one of the base portion and the film layer of the filter, thereby uniformly diffusing the light emitted from the panel, The upper and lower viewing angles of the plasma display panel can be widened and the pattern formed on the external light shielding sheet can be concealed.

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

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

1, the plasma display panel includes a scan electrode 11 and a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, an address electrode 22 formed on the lower substrate 20, .

The sustain electrode pairs 11 and 12 include transparent electrodes 11a and 12a formed of indium-tin-oxide (ITO) and bus electrodes 11b and 12b. 12b may be formed of a metal such as silver (Ag), chromium (Cr), or a laminate of chromium / copper / chromium (Cr / Cu / Cr) or a laminate of chromium / aluminum / chromium . The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to reduce the voltage drop due to the transparent electrodes 11a and 12a having high resistance.

According to an embodiment of the present invention, the sustain electrode pairs 11 and 12 may have a structure in which not only the transparent electrodes 11a and 12a but the bus electrodes 11b and 12b are laminated, It may be constituted by only the electrodes 11b and 12b. This structure does not use the transparent electrodes 11a and 12a, and thus has an advantage in that the unit cost of manufacturing a panel can be reduced. The bus electrodes 11b and 12b used in such a structure may be made of various materials such as a photosensitive material in addition to the materials listed above.

Between the transparent electrodes 11a and 12a of the scan electrode 11 and the sustain electrode 12 and the bus electrodes 11b and 11c is formed a light absorbing external light generated from the outside of the upper substrate 10, A black matrix (BM matrix) 15 functioning to cut off and function to improve the purity and contrast of the upper substrate 10 is arranged.

The black matrix 15 according to an exemplary embodiment of the present invention is formed on the upper substrate 10 and includes a first black matrix 15 formed at a position overlapping the barrier ribs 21 and transparent electrodes 11a and 12a, And second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, which are also referred to as a black layer or a black electrode layer, may be formed at the same time in the forming process and may be physically connected to each other, .

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

An upper dielectric layer 13 and a protective film 14 are stacked on the upper substrate 10 on which the scan electrode 11 and the sustain electrode 12 are arranged. Charged particles generated by the discharge are stored in the upper dielectric layer 13 and can function to protect the sustain electrode pairs 11 and 12. [ The protective film 14 protects the upper dielectric layer 13 from the sputtering of charged particles generated during the gas discharge and increases the emission efficiency of the secondary electrons.

In addition, the address electrodes 22 are formed in a direction intersecting the scan electrodes 11 and the sustain electrodes 12. A lower dielectric layer 24 and barrier ribs 21 are formed on the lower substrate 20 on which the address electrodes 22 are formed.

A phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the barrier ribs 21. The barrier ribs 21 are formed in a closed shape such that the vertical barrier ribs 21a and the horizontal barrier ribs 21b physically separate the discharge cells and prevent the ultraviolet rays and the visible rays generated by the discharge from being leaked to the adjacent discharge cells .

In an embodiment of the present invention, not only the structure of the partition 21 shown in FIG. 1 but also the structure of the partition 21 having various shapes will be possible. For example, a differential type barrier rib structure in which the vertical barrier ribs 21a and the horizontal barrier ribs 21b have different heights, a channel in which a channel usable as an exhaust passage is formed in at least one of the vertical barrier ribs 21a or the horizontal barrier ribs 21b, Type barrier rib structure, a groove type barrier rib structure in which a hollow is formed in at least one of the vertical barrier ribs 21a and the horizontal barrier ribs 21b, or the like.

In the case of the differential type barrier rib structure, it is preferable that the height of the horizontal barrier rib 21b is high, and in the case of the channel type barrier rib structure or the groove type barrier rib structure, a channel is formed or a groove is formed in the horizontal barrier rib 21b something to do.

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

The phosphor layer 23 is emitted by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G) and blue (B). 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 and lower substrates 10 and 20 and the barrier ribs 21.

Referring to FIG. 1, it is preferable that a filter 100 is formed on a front surface of a plasma display panel according to the present invention. Hereinafter, an embodiment of the structure of the filter 100 will be described.

FIG. 2 is a cross-sectional view illustrating an external light blocking sheet according to an embodiment of the present invention. The external light blocking sheet includes a base unit 200 and a pattern unit 210.

The base part 200 is preferably made of a transparent plastic material such as a resin-based material formed by ultraviolet (UV) curing so that light can be transmitted smoothly, A solid glass material may be used.

Referring to FIG. 2, the pattern unit 210 is formed on the base unit 200 and absorbs external light. The shape of the pattern unit 210 may be triangular, and may have various shapes such as a trapezoid, a square, and the like. The pattern unit 210 is formed of a darker material than the base unit 200, and is preferably made of a black material. For example, the pattern unit 210 may be formed of a carbon-based material or may be coated with a black dye to maximize the effect of absorbing external light. Hereinafter, the width of the upper and lower ends of the pattern unit 210 will be referred to as the lower end of the pattern unit 210.

2, the lower end of the pattern unit 210 is disposed on the panel side, and the upper end of the pattern unit 210 is disposed on the observer side to which external light is incident. Also, contrary to the above arrangement, the lower end of the pattern unit 210 may be disposed on the observer side, and the upper end of the pattern unit 210 may be disposed on the panel side.

Since the external light source is generally located on the upper side of the panel, the external light is incident on the panel diagonally from the upper side and absorbed into the pattern portion 210.

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

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

3 to 6 are sectional views illustrating embodiments of the structure of the external light shielding sheet for explaining optical characteristics according to the structure of the external light shielding sheet.

3, the external light is absorbed and shielded, and the refractive index of the pattern portion 305 is adjusted so that the refractive index of the pattern portion 305, that is, at least a portion of the pattern portion 305, Is smaller than the refractive index of the base portion 300. [

As described above, the external light that lowers the bright room contrast of the plasma display panel is often located above the panel 310. Referring to FIG. 3, external light (indicated by a dotted line) obliquely incident on the external light blocking sheet is refracted and absorbed into the pattern unit 305 having a refractive index smaller than that of the base unit 300, according to Snell's law . External light refracted into the pattern unit 305 can be absorbed by the light absorbing particles.

 Also, the light (indicated by a solid line) emitted from the panel 310 to the outside for the display is totally reflected on the inclined surface of the pattern unit 305 and is reflected to the outside of the observer side.

The reason why the light (indicated by a solid line) which is refracted and absorbed by the pattern unit 305 and emitted from the panel 310 is totally reflected by the pattern unit 305 is as shown in FIG. 3 The angle formed by the external light of the panel 310 with the sloped surface of the pattern unit 305 is greater than the angle formed by the sloped surface of the pattern unit 305 as shown in FIG.

Therefore, the external light blocking sheet according to the present invention absorbs external light so that external light is not reflected to the observer side, and improves the bright room contrast of the display image by increasing the amount of reflection of light emitted from the panel 310.

The refractive index of the pattern unit 305 is preferably 0.3 times or more and less than 1 times the refractive index of the base unit 300 in order to maximize absorption of external light and total reflection of the light of the panel 305 in consideration of the angle of external light incident on the panel 310 . Considering the upper and lower viewing angles of the plasma display panel, the refractive index of the pattern unit 305 is set to be 0.3 of the refractive index of the base unit 300 in order to maximize the total reflection of the light emitted from the panel 310 on the inclined plane of the pattern unit 305. [ Fold to 0.8 fold.

3, when the upper end of the pattern unit 305 is disposed on the observer side and the refractive index of the pattern unit 305 is smaller than the refractive index of the base unit 300, light emitted from the panel is transmitted through the pattern unit 305 ) And spreads to the observer side, so that a ghost phenomenon in which the image is not clear and disturbed as viewed from the observer side may occur.

4 shows a case where 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. [ 4, since the refractive index of the pattern unit 325 is larger than the refractive index of the base unit 320, the external light and the panel light incident on the pattern unit 325 are absorbed by the pattern unit 325 according to Snell's law. 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 can be reduced. The difference between the refractive index of the pattern unit 325 and the refractive index of the base unit 320 is preferably 0.05 or more in order to sufficiently absorb the panel light obliquely incident on the pattern unit 325 to prevent ghosting.

When the refractive index of the pattern portion 325 is made larger than the refractive index of the base portion 320, the transmittance and the bright room contrast of the external light shielding sheet can be reduced, thereby preventing the ghost phenomenon and greatly lowering the transmittance of the external light shielding sheet 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. Further, in order to prevent the ghost phenomenon and to maintain the bright-field court of the panel at an appropriate level, it is preferable that the refractive index of the pattern portion 325 is set to be 1.0 to 1.3 times the refractive index of the base portion 320. [

5 shows a case where the lower end of the pattern portion 345 is disposed on the observer side and the refractive index of the pattern portion 345 is smaller than the refractive index of the base portion 340. [ As shown in FIG. 5, the lower end of the pattern portion 345 is disposed on the observer side to which the external light is incident, and the external light is absorbed to the lower end of the pattern portion 345, whereby the external light blocking effect can be improved. In addition, since the interval between the lower ends of the pattern unit 345 can be made larger than the case shown in Fig. 4, the aperture ratio of the external light shielding sheet can be improved.

5, the panel light emitted from the panel 350 may be reflected on the inclined surface of the pattern unit 345, and may be gathered around the panel light passing through the base unit 340. Accordingly, the ghost phenomenon can be reduced without significantly lowering the transmittance of the external light shielding sheet.

The interval d between the panel 350 and the external light shielding sheet is required to prevent the ghost phenomenon due to the gathering of the panel light passing through the base portion 340 by being reflected by the inclined surface of the pattern portion 345, Is preferably 1.5 to 3.5 mm.

6 shows a case where the lower end of the pattern portion 365 is disposed on the observer side and the refractive index of the pattern portion 365 is larger than the refractive index of the base portion 360. [ 6, since the refractive index of the pattern unit 365 is larger than that of the base unit 360, the panel light incident on the sloped surface of the pattern unit 365 can be absorbed by the pattern unit 365. Accordingly, since the image is displayed by the panel light passing through the base portion 360, the ghost phenomenon can be reduced.

Since the refractive index of the pattern portion 365 is larger than the refractive index of the base portion 360, the external light absorption effect can be improved.

7 is a cross-sectional view showing a first embodiment of a structure in which a plurality of diffusion beads 540 are formed on a base portion 520. FIG. Referring to FIG. 7, the filter 500 of the present invention includes an external light shielding sheet. The external light shielding sheet includes a base portion 520, a plurality of pattern portions 525 formed on the base portion 520 to absorb external light, and a film layer 530 formed on at least one surface of the base portion 520, . As described above, the base portion 520 is preferably made of a Resin-based material. The base portion 520 and the plurality of pattern portions 525 have the same specific structures as those described above, and will not be described below.

The film layer 530 includes at least one of PET (Poly Ethylene Terephthalate) and PMMA (Poly methyl Meta Acrylate), and a plurality of glass particles may be formed on at least one surface of the film layer 530. When PET is used as the film layer 530, light generated from the panel 510 can be easily emitted to the outside due to its high transparency. When PMMA is used as the film layer 530, the thickness of the external light shielding sheet is thick It can be used for a large-sized display device having high heat resistance and high heat generation.

The film layer 530 is made of a material that can transmit visible light and can function to allow the filter 500 according to the present invention to be directly attached to the front surface of the display device. That is, any transparent material which is advantageous to be adhered to materials such as glass or plastic due to its interfacial property can be used, and it can be made of a flexible material for convenience of transportation and adhesion process.

At least one of the base portion 520 and the film layer 530 includes a plurality of diffusion beads 540. The diffusion beads 540 serve to diffuse the incident light so that the light maintains uniform brightness. Accordingly, the diffusion beads 540 can uniformly diffuse the light emitted from the panel 510, thereby uniformly improving the brightness of the display image. In addition, the upper and lower viewing angles of the plasma display panel 510 can be widened, and the pattern formed on the external light shielding sheet or the like can be concealed.

7, a plurality of diffusion beads 540 are formed in the base 520. Light emitted from the panel 510 (indicated by a solid line) passes through two adjacent pattern units 525 And is emitted to the outside of the observer side. The panel light passing through the film layer 530 is incident on the base portion 520. The diffusion beads 540 uniformly diffuse the panel light incident on the base portion 520, The upper and lower viewing angles of the panel light can be widened.

Although an embodiment of the filter structure according to the present invention has been described with reference to FIG. 7 where the film layer 530 is positioned between the panel 510 and the base 520, the order of lamination is not limited to the embodiment of the present invention The positions of the film layer 530 and the base 520 may be changed.

The base portion 520 may be integrally coated with the plurality of diffusion beads 540. Specifically, the base portion 520 may be melt-mixed with the plurality of diffusion beads 540, . Here, the plurality of diffusion beads 540 are substantially uniformly distributed in the base portion 520 so that the diffusion effect of the light depending on the position can be uniform.

The plurality of diffusion beads 540 are mixed in the base 520 to scatter the light emitted from the panel 510 so as to increase the light uniformity over the entire surface so that a difference in brightness does not occur between the light source position and the position between the light sources do.

The base portion 520 and the diffusion beads 540 may be made of a material having the same refractive index. In the case of having the same refractive index, the refraction of the visible light ray does not occur on the surface where the base portion 520 and the diffusion beads 540 are in contact with each other.

In order to maximize the effect of the bright room contrast diffusion due to blocking, transmission and diffusion of light in relation to the size of the discharge cells of the plasma display panel 510 when used in a plasma display apparatus, a plurality of diffusion beads 540 ) Is preferably 3.0 占 퐉 to 10 占 퐉.

8 is a cross-sectional view showing a second embodiment of a structure in which a plurality of diffusion beads 640 are formed in a film layer 630. FIG. Hereinafter, differences from the embodiment shown in FIG. 7 will be mainly described. In FIG. 8, a structure in which a film layer 630, not the base 620, is integrally coated with a plurality of diffusion beads 640 is shown. That is, the diffusion beads 640 may be formed integrally with the base layer 620 as well as the film layer 630.

9 is a cross-sectional view showing a third embodiment of a structure in which a plurality of diffusion beads 740 are included in a coating layer 750 formed on one side of a film layer 730. FIG. Hereinafter, differences from the embodiment shown in FIG. 7 will be mainly described.

A coating layer 750 may be formed on one side of the film layer 730 and a coating layer 750 may include a plurality of diffusion beads 740. The coating layer 740 may be bonded to the base portion 720 by an acrylic adhesive or the like. The coating layer 740 is made of a material that transmits visible light and is for attaching a plurality of diffusion beads 740 to the film layer 730. Preferably, the coating layer 750 is made of a transparent acrylic resin and is melt-mixed with the plurality of diffusion beads 740, and may be formed by extrusion molding. Here, the plurality of diffusion beads 740 are substantially uniformly distributed in the coating layer 750 so that the diffusion effect of the light depending on the position can be uniform.

The coating layer 750 and the diffusion beads 740 may be made of materials having the same refractive index. When the refractive indexes are the same, the visible rays do not refract on the surface where the diffusion beads 740 and the coating layer 750 are in contact with each other. The coating layer 750 may be made of an ultraviolet curable resin that is cured by ultraviolet rays, or alternatively may be made of a thermosetting resin that is cured by heat.

A pigment or pigment may be added to the coating layer 750. The color and transmittance of the visible light incident from the display device can be controlled by using the coating layer 750.

10 is a cross-sectional view showing the structure of a filter 800 according to another embodiment of the present invention. The filter 800 according to the present invention may include an AR / NIR sheet 810, an EMI shielding sheet 820 and an external light shielding sheet 830, and the adhesive layer 810, 820, (840) may be formed.

The AR / NIR sheet 810 includes an AR (anti-reflection) layer 811 having a function of preventing reflection of light incident from the outside on the front surface of a base sheet 813 made of a transparent plastic material to reduce glare, And a NIR (Near Infrared) shielding sheet 812 for shielding near infrared rays radiated from the panel and transmitting signals transmitted by infrared rays, such as a remote controller, may be attached to the rear surface.

The EMI shielding sheet 820 shields EMI (Electromagnetic Interference) to prevent EMI emitted from the panel from being emitted to the outside, and a plurality of conductive layers, for example, a plurality of metal layers and conductive transparent layers, It may have a laminated structure.

An adhesive layer 840 may be formed between the AR / NIR sheet 810, the EMI shielding sheet 820 and the external light shielding sheet 830, and each of the sheets 810, 820, 830, To be firmly attached to the front surface of the panel. In addition, it is preferable that the material of the base sheet included between the respective sheets 810, 820, 830 uses substantially the same material in consideration of easiness of manufacturing the filter.

10, the AR / NIR sheet 810, the EMI shielding sheet 820, and the external light shielding sheet 830 are stacked in this order, but the stacking order of each sheet may be stacked differently by those skilled in the art. Also, at least one of the illustrated sheets 810, 820, 830 may be omitted, or another functional layer may be added.

At least one base sheet of the base sheets shown in Fig. 10 may be omitted, and one of the base sheets may be made of a solid glass rather than a plastic material to improve the function of protecting the panel . The glass is preferably spaced apart from the panel at a predetermined interval.

As described above, the filter including the external light shielding sheet according to the present invention may be formed as a film filter type attached to a panel using an adhesive, or may be a glass filter type including a glass and spaced apart from the panel .

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

The present invention can uniformly diffuse the light emitted from the panel to uniformly improve the luminance of the display image, widen the vertical viewing angle of the plasma display panel, and hide the pattern formed on the external light shielding sheet or the like, And a plasma display device having the same.

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

2 is a cross-sectional view showing an embodiment of an external light shielding sheet structure provided in the filter shown in FIG.

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

7 is a cross-sectional view showing a first embodiment of a structure in which a plurality of diffusion beads are formed in a base portion.

8 is a cross-sectional view showing a second embodiment of a structure in which a plurality of diffusion beads are formed in a film layer.

9 is a cross-sectional view showing a third embodiment of a structure in which a plurality of diffusion beads are included in a coating layer formed on one side of a film layer.

10 is a cross-sectional view illustrating a structure of a filter according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

100, 500, 600, 700, 800: filters 200, 300, 320, 340, 360, 520,

210, 305, 325, 345, 365, 524, 625,

530, 630, 730: Film layer 540, 640, 740:

Claims (14)

A filter formed on a front surface of a display panel, A base portion; And And an external light blocking sheet formed on the base portion and including a plurality of pattern portions for absorbing external light, The base portion includes a plurality of diffusion beads, Wherein the base portion is formed integrally with the plurality of diffusion beads, and the refractive index of the base portion is equal to the refractive index of the plurality of diffusion beads. The method according to claim 1, Wherein the external light shielding sheet further comprises a film layer formed on at least one surface of the base portion. The method according to claim 1, Wherein the plurality of diffusion beads have an average diameter of from 3.0 mu m to 10 mu m. delete The method according to claim 1, Wherein the base portion is melt-mixed with the plurality of diffusion beads and formed by extrusion molding. The method according to claim 1, Wherein the pattern portion comprises light absorbing particles. A filter formed on a front surface of a display panel, A base portion; A plurality of pattern units formed on the base unit and absorbing external light; And And an external light shielding sheet including a film layer formed on at least one surface of the base portion, The film layer includes a plurality of diffusion beads, Wherein a coating layer is formed on one side of the film layer, the coating layer includes the plurality of diffusion beads, and the refractive index of the coating layer is the same as the refractive index of the plurality of diffusion beads. 8. The method of claim 7, Wherein the plurality of diffusion beads have an average diameter of from 3.0 mu m to 10 mu m. 8. The method of claim 7, Wherein the film layer is formed integrally with the plurality of diffusion beads. delete 8. The method of claim 7, Wherein the film layer is positioned between the panel and the base portion. 8. The method of claim 7, Wherein the film layer comprises at least one of PET (Poly Ethylene Terephthalate) and PMMA (Poly Methyl Meta Acrylate), and a plurality of glass particles are formed on at least one surface of the film layer. The method according to claim 1, An AR layer for preventing reflection of external light; A NIR shielding layer shielding near-infrared rays emitted from the panel; And And at least one of EMI shielding layers shielding electromagnetic waves. A plasma display device in which the filter according to any one of claims 1 to 3, 5 to 9, and 11 to 13 is disposed on a front surface of a plasma display panel.

Images