KR20080036804A - Filter and plasma display device thereof - Google Patents

Abstract

A filter and a plasma display apparatus using the same are provided to prevent the reduction of contrast by implementing an external beam preventing film on the filter. The plasma display apparatus includes a plasma display panel(P), a filter(100), and a prism sheet(200). The filter is coupled at the front of the plasma display panel. The prism sheet, which is formed between the plasma display panel and the filter, includes a triangular shaped concave part(202) at a surface opposite to the filter. The filter includes an AR(Anti-Reflection) layer for preventing external lights, a NIR(Near Infrared) layer for shielding infrared rays from the plasma display panel, and an EMI(ElectroMagnetic Interference) layer for shielding electromagnetic wave from the plasma display panel.

Description

FILTER AND PLASMA DISPLAY DEVICE THEREOF}

1 is a structural diagram of a plasma display panel according to the present invention;

2 is a structural diagram of a plasma display device according to a first embodiment of the present invention;

3 is a structural diagram of a plasma display device according to a second embodiment of the present invention;

4 is a structural diagram of a plasma display device according to a third embodiment of the present invention;

5 is a structural diagram of a plasma display device according to a fourth embodiment of the present invention;

6 is a structural diagram of a plasma display device according to a fifth embodiment of the present invention;

7 is a structural diagram of a plasma display device according to a sixth embodiment of the present invention;

8 is a structural diagram of an external light blocking film of the present invention;

9 is a cross-sectional view of an external light blocking film of the present invention.

The present invention relates to a filter and a flat panel display device, and more particularly, to a filter and a plasma display device including a prism sheet capable of collecting panel image light and having an external light blocking function.

The type of flat panel display panel refers to a device in which an image is displayed through a flat panel such as LCD, PDP, OLED, FED, and SED, and a driving technology for displaying an image may be variously applied.

When the flat panel displays a black image, external environment light is reflected from the front of the panel due to the white phosphor exposed on the upper or lower panel of the panel, so that the black image is perceived as a bright dark color, and the contrast is reduced. There is a problem.

On the other hand, unlike LCD, PDP has the advantage that there is almost no difference in luminance emitted from the front and the slope, but since the viewing is mainly done in the front, the development to increase the panel image light in the front is more progressed than in the slope. have.

The present invention has been made to solve the above-mentioned problems of the prior art, and condenses the panel image light emitted from the panel to further increase the luminance at the front and at the same time absorb and refract the external environmental light to reduce the luminance due to reflection of external light It is an object of the present invention to provide a filter and a plasma display device capable of preventing the same.

To this end, the present invention intends to couple the prism sheet to the panel or to apply the prism sheet to the filter.

The plasma display device of the present invention includes a panel, a filter coupled to the front of the panel, and a prism sheet positioned between the panel and the filter and having irregularities formed on a surface opposite to the filter.

The filter includes at least one of an AR film preventing reflection of external ambient light, an NIR shielding film shielding near infrared rays emitted from the panel, and an EMI shielding film shielding electromagnetic waves emitted from the panel.

In addition, the filter includes an external light blocking sheet that refracts and absorbs external light, and the external light blocking sheet includes a base part and a pattern part having a refractive index smaller than or equal to that of the base part.

The refractive index of the pattern portion is 0.3 times to 1.00 times the refractive index of the base portion, and the external light blocking film thickness is 1.01 times to 2.25 times the height of the pattern portion.

In addition, the prism sheet may be implemented by being included in the filter, wherein the prism sheet is formed with a base portion having a concave-convex portion protruding forward and a pattern portion having a refractive index smaller than or equal to the base portion, Refract and absorb external ambient light while condensing light emitted from the panel.

On the other hand, the prism sheet of the present invention can perform the function of the external light blocking sheet for absorbing and refracting the external ambient light, the base portion and a plurality of pattern portions having a refractive index less than or equal to the base portion is formed, The refractive index of any one of the plurality of pattern portions may be different from the refractive index of another neighboring pattern portion, thereby making it possible to collect and emit light emitted from the panel while refracting and absorbing external environmental light without forming a protruding uneven portion. .

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

First, FIG. 1 is a perspective view showing a PDP configuration as one embodiment of a flat panel display panel.

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

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

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Between the transparent electrodes 11a and 12a of the scan electrode 11 and the sustain electrode 12 and the bus electrodes 11b and 11c, external environment light generated outside the upper substrate 10 is absorbed to reduce reflection. Black matrixes (BMs, 15) are arranged that function to block light and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10, the first black matrix 15 and the transparent electrodes 11a and 12a formed at positions overlapping the partition wall 21. And the second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be simultaneously formed and thus not physically connected. .

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

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, a lower dielectric layer 24 and a partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking into adjacent discharge cells.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be possible.

Here, in the case of the differential partition wall structure, the height of the horizontal partition wall 21b is more preferable, and in the case of the channel partition wall structure or the groove partition wall structure, it is preferable that a channel is formed or the groove is formed in the horizontal partition wall 21b. something to do.

On the other hand, in one embodiment of the invention is shown and described that each of the R, G and B discharge cells are arranged on the same line, it may be arranged in a different shape. 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.

The filter 100 is coupled to the front of the panel configured to improve image quality. The filter may be formed of a glass type or a film type, or may be formed of other types.

The filter 100 is formed by stacking one or more films, and the prism sheet 200 of the present invention may be coupled to the panel by being included in the filter, and may be formed as a separate film from the filter. It can be inserted between the filter and the panel.

In addition, the prism sheet 200 may be attached to, adhered to, attached to the front surface of the panel, or spaced apart from the panel by a predetermined distance.

The prism sheet 200 of the present invention performs a function of refracting light so that light emitted from the panel is focused toward the front, thereby improving luminance at the front, thereby increasing luminous efficiency.

First, a plasma display device equipped with a prism sheet of the present invention will be described with reference to FIG. 2. In the first embodiment of FIG. 2, a prism sheet having protruding convex portions 202 is provided, and the prism sheet 200 is inserted between the filter 100 and the panel P.

In the first embodiment, the prism sheet 200 is formed of only a base portion 201 made of a transparent material, and an uneven portion 202 is formed on the front surface of the base portion. That is, the uneven portion protrudes toward the front where the viewer is located, and the rear surface where the panel is located is rough.

At this time, the cross-section of the uneven portion 202 is preferably a triangle, but not limited to any shape as long as the shape can be refracted so that the light emitted from the panel toward the front. Therefore, the cross section of the uneven portion may be a triangle, a square, a circle, or the like having an inclined surface.

In the first embodiment, since the prism sheet 200 is manufactured separately from the filter 100, the luminance at the front of the panel can be increased simply by adding the step of inserting and placing the prism sheet in the manufacturing process.

In this case, the filter 100 may include at least one of an anti-reflection (110) film, a near infrared (NIR) 120 shielding film, an electromagnetic interference (130) shielding film, and a support transparent substrate.

In addition, any one layer laminated on the panel P or included in the filter 100 may include an anti-glare film, a matt coating, and an electrostatic or external material that suppresses reflection of external light at the outermost surface. Antistatic film, anti-glare coating film, etc. may be further provided to prevent contamination from the environment, color correction and Ne light shielding coating film to improve the color purity displayed, uniformly diffuse the light emitted from the panel of the display screen A diffusion film or the like capable of widening the vertical viewing angle may be further provided, but is not limited by the drawings.

The AR film 110 is a film having a function of reducing glare by preventing reflection of external ambient light and is arranged to form the outermost surface of a plurality of films or a filter composed of the plurality of films coupled to the panel.

In addition, the NIR shielding film 120 is a film for shielding the near infrared rays emitted from the panel so that the signals transmitted using infrared rays, such as a remote control, can be normally transmitted, the EMI shielding film 130 is an electromagnetic wave emitted from the panel It is a membrane for shielding.

In this case, the EMI shielding layer 130 is typically formed of a mesh structure using a conductive material, and a conductive material is formed on an ineffective display area of a panel on which an image is not displayed in order to facilitate grounding. Is applied.

However, the stacking order of the AR film 110, the NIR shielding film 120, and the EMI shielding film 130 may be differently stacked by those skilled in the art, and at least one layer may be omitted and is not limited by the drawings. do.

As described above, in the plasma display apparatus including the prism sheet 200, since the visible light emitted from the panel is refracted inward while passing through the prism sheet, the luminance at the front of the viewer is increased.

As such, the panel image light collected while passing through the prism sheet 200 is displayed to the outside through the boundary surface of each layer constituting the filter 100.

The second embodiment shown in FIG. 3 illustrates that the prism sheet is not manufactured separately, but is one layer constituting the filter.

In this case, the plurality of layers constituting the filter 101 will be replaced with the description in the first embodiment.

The prism sheet 200 may be disposed at any position among the plurality of layers constituting the filter, but performs a function of condensing the light emitted from the panel. As shown in FIG. It is preferably arranged in.

In the third embodiment of FIG. 4, the prism sheet is manufactured separately as in the first embodiment, but the external light blocking film 140 for refracting and absorbing the external environmental light incident toward the panel is formed by the filter 102. It is included in the example.

In this case, the prism sheet 200 will be replaced with the description of the first embodiment. This prism sheet is inserted between the filter 102 and the panel P.

In addition, as illustrated in FIG. 8, the external light blocking layer 140 included in the filter 102 includes a transparent base portion 141 and one or more grooves formed in the base portion to form a pattern portion 142. Dark particles 143 having a color darker than that of the base part are filled in to absorb and refract external light.

The base portion 141 is preferably made of a transparent plastic material, for example, a resin-based material formed by an ultraviolet (UV) curing method so that light can be transmitted through smoothly, and protects the entire surface of the panel. In order to increase the strength of the glass material may be used.

That is, the base portion 141 is configured to include at least one transparent resin layer and a transparent adhesive layer, it is possible to absorb the external impact by adjusting the elasticity and Young's modulus of the transparent adhesive layer.

The transparent resin layer includes at least one of polyester resin, polypropylene resin, ethylene vinyl acetate copolymer, polyethylene, and polyurethane, and the transparent adhesive layer includes acrylic resin or silicone resin.

In addition, the shape of the pattern portion 142 may be triangular, rectangular, trapezoidal, as shown in FIG. 9, in addition, it may be formed in a shape having a symmetrical shape, asymmetrical different curvature, and a curvature.

The dark particle 143 is a material of darker color than the base portion 141 and is preferably made of a black material to absorb light, for example, a carbon-based material.

In the fourth embodiment illustrated in FIG. 5, as the filter 103 includes the prism sheet 200 and the external light blocking film 140, the filter is mounted on the panel to condense the panel image light and to enter the panel. It is possible to improve contrast by refracting and absorbing external environmental light.

That is, the prism sheet 200 is further included in the same filter as the third embodiment, and the description of the prism sheet and the external light shielding film is replaced as described above.

However, although the prism sheet 200 and the external light blocking film 140 may be disposed at any position among the plurality of layers constituting the filter, the prism sheet 200 performs a function of condensing light emitted from the panel. As shown in the drawing, the panel is preferably disposed at a position adjacent to the panel, and the external light blocking film 140 is preferably disposed inside the AR film 110 forming the outermost surface of the filter.

The fifth embodiment shown in FIG. 6 is characterized in that a pattern is formed on the prism sheet to enable external light blocking function. That is, the prism sheet and the external light shielding film are integrated on a single sheet.

To this end, the prism sheet 210 has a base portion 201 and a plurality of pattern portions 204 and 205 having a refractive index smaller than or equal to the base portion are formed in the base portion, and one of the pattern portion refractive indices is adjacent to the base portion 201. It is different from the refractive index of other pattern portions.

That is, as a plurality of grooves are formed in the base portion, a plurality of pattern portions are formed, and some of the plurality of pattern portions 205 are filled with dark particles to absorb and refract external environmental light incident on the panel to prevent diffuse reflection. The other part 204 of the plurality of pattern portions are smaller than the base portion, but transparent than the dark particles, and are filled with particles having a high light transmittance and refracting light emitted from the panel. The brightness is increased.

At this time, when the pattern portion filled with the dark particles is called the first pattern portion 205 and the pattern portion filled with the transparent particles rather than the dark particles is called the second pattern portion 204, the first pattern portion is the second pattern portion. Compared with the light absorption rate, the second pattern portion has a higher light transmittance than the first pattern portion.

In addition, the heights of the first pattern portion 205 and the second pattern portion 204 may be different, which are preferably formed to cross each other and neighbor each other. As a result, light is absorbed by the first pattern portion and light is transmitted by the second pattern portion to maintain luminance.

The prism sheet of this fifth embodiment may be inserted between the panel and the filter separately from the filter, and may be made of any one layer constituting the filter. At this time, the prism sheet 210 of the fifth embodiment is preferably arranged to be the layer closest to the panel among the plurality of layers constituting the filter.

The sixth embodiment shown in FIG. 7 also forms a pattern on the prism sheet to enable external light blocking function. However, the prism sheet of the sixth embodiment is different from the shape of the fifth embodiment because it has protruding irregularities.

To this end, the prism sheet 220 has a base portion 201 having an uneven portion 202 protruding toward the front, and a pattern portion 205 having a refractive index smaller than or equal to the base portion is formed on the base portion. .

Therefore, the light emitted from the panel is refracted by the uneven portion 202 formed in the base portion, and is condensed to the front. External ambient light is absorbed and refracted.

The prism sheet 220 of the sixth embodiment may be inserted between the panel and the filter separately from the filter, and may be manufactured as one layer constituting the filter. At this time, the prism sheet of the sixth embodiment is preferably arranged to be the layer closest to the panel among the plurality of layers constituting the filter.

Hereinafter, the structure of the external light blocking film of the above embodiment will be described in more detail with reference to FIGS. 8 and 9.

The pattern part 142 formed on the external light blocking layer 140 absorbs external light by applying the dark particles 143 to the groove of the base part, and has a refractive index smaller than or equal to that of the base part 141.

It is easy to manufacture the dark particles 143, easy to add to the pattern portion 142, the size and weight of the dark particles are determined in order to maximize the external environmental light absorption effect, the size of the particles In the case of 1 μm or more, the pattern part preferably contains 10% by weight or more of dark particles in order to effectively absorb external environmental light refracted by the pattern part. When the size of the particles is 1 μm or less, the pattern part includes 2 dark particles. It is preferably included within 10% by weight.

In addition, although the shape of the dark particles is illustrated in the drawings, the shape of the particles may not have a circular shape due to the manufacturing process or for other purposes, and in this case, the diameter of the circle inscribed to the particles is preferably 1 μm or more. Do.

In addition, the size of the particles included in the pattern portion 142 may be different from each other, in this case, the average size of the particles is preferably 1㎛ or more.

In order to maximize the absorption of the external ambient light and the total reflection of the panel light in consideration of the general angle of the external ambient light incident on the panel, the refractive index of the pattern portion 142 is in the range of 0.3 times to 1.00 times the refractive index of the base portion 141. . Further, in order to maximize the total reflection of the light emitted from the panel on the inclined surface of the pattern portion, the refractive index of the pattern portion is preferably 0.3 times to 0.8 times in consideration of the upper and lower panel viewing angles.

That is, the external environment light incident at an angle is refracted and absorbed into the pattern part having a refractive index smaller than or equal to that of the base part 141. In addition, although the light emitted from the display panel is refracted while passing through the prism sheets 200 and 210 of the present invention, the light may be totally reflected on the inclined surface of the pattern portion of the external light blocking film and reflected to the outside. Therefore, in the plasma display device including both the prism sheet and the external light shielding film of the present invention, higher front luminance can be expected than when only the prism sheet is provided.

Therefore, the external light blocking film 140 according to the present invention absorbs the external ambient light so that the external ambient light is not reflected to the viewer side, thereby improving the clear room contrast, and assisting the function of the prism sheet to improve the front brightness.

When the thickness T of the external light blocking film 140 is 20 μm to 250 μm, the manufacturing process may be easy and may have an appropriate light transmittance. In order to smoothly transmit the light emitted from the panel, the light incident from the outside is refracted to be effectively absorbed and blocked by the pattern portion 142, and to secure the firmness of the sheet, the thickness T of the external light shielding film is 100 It may be formed to a micrometer to 180㎛.

The pattern portion 142 may be formed at a height h of 80 μm to 170 μm to effectively block external light and to prevent a short circuit.

In addition, the bottom width P1 of the pattern portion 142 may be formed to 18um to 35um, in which case the slope of the inclined surface of the groove is determined in contrast to the height (h) of the pattern portion, the external light absorption rate is increased and The aperture ratio at which the generated light source can be smoothly emitted to the viewer side can be ensured.

The panel light is emitted to the viewer side to secure an aperture ratio for displaying a display image having an appropriate brightness, and to secure an optimal pattern part slope inclination for increasing external light blocking effect and panel light reflection efficiency, The interval D1 may be in the range of 40 μm to 90 μm, and the interval D2 between the upper ends of the adjacent pattern parts may be 60 μm to 130 μm.

For the same reason as above, when the distance D1 between two adjacent bottom portions of the pattern portion is 2.5 to 5 times the width of the bottom portion of the pattern portion, the aperture ratio for the display is secured while the external light blocking effect and the panel image are secured. It is possible to increase the light reflection efficiency.

When the height h of the pattern portion has a range of 1.1 times to 2 times the distance D1 between two adjacent pattern portions, external light incident obliquely from the upper side may not be incident on the panel, and the panel light reflection efficiency Can be optimized.

Also, when the distance D2 between the upper ends of two adjacent pattern parts is 1.1 to 1.45 times the distance D1 between the lower ends of two pattern parts adjacent to each other, an aperture ratio for displaying an image having an appropriate luminance can be secured. The panel light may be totally reflected on the inclined surface of the pattern portion.

Here, the height (h) of the pattern portion may vary according to the thickness (T) of the external light blocking film, and thus have a value within a predetermined ratio range. That is, as the height h of the pattern portion increases, the thickness of the base portion may become thinner from the top of the pattern portion, and insulation breakdown or short circuit may occur. As the height h of the pattern portion decreases, external light incident at an angle within a predetermined range is directed to the panel. It may not be incident and blocked.

Table 1 below shows the results of experiments of insulation breakdown and external light blocking effects of the external light blocking film according to the thickness T of the external light blocking film and the height h of the pattern portion.

Film thickness (T) Pattern part  Height (h) Dielectric breakdown Outer light  block 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 × ×

Referring to Table 1, when the thickness T of the external light blocking film 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 destroyed, thereby reducing the defective rate of the external light blocking film. 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 75 μm or less, the external light may be incident on the panel.

Therefore, when the thickness T of the external light shielding film is 1.01 times to 2.25 times the height of the pattern portion, insulation breakdown of the upper portion of the pattern portion can be prevented, and external light can be prevented from entering the panel. 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 blocking film is 1.01 times to 1.35 times the height of the pattern portion. Can be.

Table 2 below shows the results of experiments using a PDP among flat panel display panels. Moire phenomenon and external light depend on the ratio of the width P1 of the pattern blocking portion of the external light blocking film to the width of the bus electrode formed on the upper substrate of the panel. As a result of experiments with the blocking effect, the bus electrode had a width of 90 µm.

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 2, when the width P1 of the lower end of the pattern portion is 0.2 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 P1 of the lower end of the pattern portion is preferably 0.25 times to 0.4 times the width of the bus electrode.

Table 3 below shows the results of experiments on whether the moiré phenomenon occurred and the external light blocking effect according to the ratio of the bottom width P1 of the pattern portion of the external light blocking film to the width of the vertical partition wall formed on the lower substrate of the panel. It is a case of 50 micrometers.

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 3, when the width P1 of the lower end of the pattern portion is 0.3 to 0.8 times the width of the vertical partition wall, it is possible to reduce the moire phenomenon and at the same time reduce the external light incident on the panel. In addition, in order to prevent moiré phenomenon and effectively block external light, and to secure an aperture ratio for emitting panel light, the width P1 of the lower end of the pattern portion is preferably 0.4 times to 0.65 times the width of the vertical partition wall.

9A to 9F are exemplary embodiments of shapes of pattern portions formed in the external light blocking films 140a to 140f of the present invention. As shown in FIG. 9A, the pattern portions 142 may be symmetrical triangles on both sides, or FIG. It may be a triangle asymmetrically, such as 9b. That is, the area of the left and right inclined surfaces of the pattern unit 142 may be different, or the angles formed by the lower and left respective 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 of the two inclined surfaces of the pattern portion 142 to which external light is incident may be gentler than that of the lower inclined surface. That is, the inclination of the upper inclined surface of the two inclined surfaces of the pattern portion 142 may be smaller than the inclination of the lower inclined surface.

Referring to FIG. 9C, the pattern portion 142 may have a trapezoidal shape, in which case, the width P2 of the upper end is larger than the width P1 of the lower end. In addition, the width P2 of the upper end of the pattern portion 221 may be 5 μm or less, thereby forming an inclined surface slope that may effectively absorb external light and reflect panel light in relation to the lower width P1. .

9D to 9F are shapes of pattern portions respectively corresponding to FIGS. 9A to 9C, which illustrate that the left and right inclined surfaces each have a curved shape. In addition, the top or bottom of the pattern may have a curved shape.

In addition, in the embodiments of the cross-sectional shape of the pattern portion 142 illustrated in FIGS. 9A to 9F, the corner portion of the pattern portion may have a curved shape having a predetermined curvature. It may have a curved shape extending outward.

The pattern portion 142 formed as described above may be formed in a stripe, and one or both ends of the pattern portion may be connected to each other to form a closed loop.

The numerical ranges for the shape, height, spacing, and width of the pattern portion provided in the external light blocking film 140 are the same as those of the fifth and sixth embodiments as well as the external light blocking film provided in the filter as in the third and fourth embodiments. The same applies to the prism sheet provided with the external light blocking function.

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

The filter and the plasma display device provided with the prism sheet of the present invention configured as described above may further improve the image quality experienced by the viewer because the luminance at the front surface is further increased as the light source emitted from the panel is focused.

In addition, when the filter is provided with an external light shielding film or when the external light shielding film is provided with a prism function, brightness at the front of the panel is increased, and external ambient light can be prevented from being diffused to reduce contrast, thereby improving image quality. It works.

Claims (13)

Plasma display panel, A filter coupled at the front of the panel, And a prism sheet disposed between the panel and the filter and having an uneven portion formed on a surface of the panel opposite to the filter. In claim 1, And a cross section of the uneven portion is a triangle. In claim 1, The filter may include an AR film to prevent reflection of external ambient light; A NIR shielding film shielding near infrared rays emitted from the panel; And And at least one of an EMI shielding film shielding electromagnetic waves emitted from the panel. In claim 1, The filter includes an external light blocking sheet that refracts and absorbs external light, The external light blocking sheet has a base portion and a pattern portion having a refractive index smaller than or equal to the base portion is formed in the base portion plasma display apparatus. In claim 4, The refractive index of the pattern portion is 0.3 times to 1.00 times the refractive index of the base portion Plasma display device characterized in that. In claim 4, The thickness of the external light blocking film is a flat panel display device, characterized in that 1.01 to 2.25 times the height of the pattern portion. The filter coupled to the plasma display panel includes a prism sheet for collecting light emitted from the panel, The prism sheet is a filter, characterized in that the base portion is formed with an uneven portion protruding toward the front, and the pattern portion having a refractive index less than or equal to the base portion is formed in the base portion. In claim 7, The filter may include an AR film to prevent reflection of external ambient light; A NIR shielding film shielding near infrared rays emitted from the panel; An EMI shielding film for shielding electromagnetic waves emitted from the panel; And at least one of a supporting transparent substrate. In claim 7, A filter, characterized in that the cross section of the uneven portion is a triangle. In claim 7, The refractive index of the pattern portion is a filter, characterized in that 0.3 to 1.00 times the refractive index of the base portion. The filter coupled to the plasma display panel includes a prism sheet for collecting light emitted from the panel, The prism sheet has a base portion; A plurality of pattern portions having a refractive index smaller than or equal to the base portion are formed, and the light absorption rate of any one of the pattern portions of the plurality of pattern portions is different from the light absorption rate of another neighboring pattern portion. In claim 11, Some of the plurality of pattern portions are filled with dark particles, And the other part is filled with particles that are transparent than the dark particles. In claim 11, The filter may include an AR film to prevent reflection of external ambient light; A NIR shielding film shielding near infrared rays emitted from the panel; An EMI shielding film for shielding electromagnetic waves emitted from the panel; A filter, characterized in that it further comprises at least one of the supporting transparent substrate.

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