KR100734920B1 - Plasma display device - Google Patents

Abstract

A plasma display device is provided to absorb and shield external light and secure simultaneously an aperture ratio of a panel by using an external light shielding sheet. A plasma display device includes a plasma display panel and a filter installed on the front of the plasma display panel. The filter includes a base part(110) and a plurality of pattern parts(120). The pattern parts are formed on the base part. The pattern part includes a lower end, an upper inclined side, and a lower inclined side. The upper and lower inclined sides are connected to the lower end. The thickness of the external light shielding sheet is 1.01 to 1.5 times of the height of the pattern part. A first internal angle(theta1) between the upper inclined side and the lower end is different from a second internal angle(theta2) between the lower inclined side and the lower end.

Description

Plasma display device

1 illustrates an embodiment of a panel structure of a plasma display device;

2 illustrates an embodiment of an electrode arrangement of a plasma display panel;

FIG. 3 illustrates an embodiment of a method in which one frame of an image is time-divided and driven into a plurality of subfields in a plasma display device.

4a to 4f are views showing various embodiments of the structure of the external light blocking sheet according to the present invention,

5 is a view showing the front surface of the external light blocking sheet according to the present invention;

6a to 7b are cross-sectional views showing embodiments of the laminated structure of the filter according to the present invention,

8 shows a structure of a plasma display device according to the present invention;

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device. In particular, in order to block external light incident from an outside of a panel, an external light shielding sheet made of two materials having different refractive indices is provided on the front of the panel, thereby providing a clear contrast and luminance of the panel. It relates to a plasma display device that can improve the.

In general, a plasma display panel (hereinafter referred to as a PDP) generates a discharge by applying a predetermined voltage to electrodes installed in a discharge space, and plasma generated during gas discharge excites phosphors, thereby preventing characters or graphics. As an apparatus for displaying an included image, it is advantageous in that it can be easily enlarged, reduced in weight, and thinned in plane, provides a wide viewing angle vertically and horizontally, and can realize full color and high brightness.

When the PDP realizes a black image, external light is reflected from the front of the panel of the PDP due to the white phosphor exposed on the 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.

The present invention has been made to solve the above-mentioned problems of the prior art, and effectively blocks the external light incident on the panel to prevent reflection of the light, and significantly improve the clear contrast of the PDP and at the same time improve the brightness of the panel An object of the present invention is to provide a plasma display device including an external light shielding sheet.

Plasma display device according to the present invention for solving the above problems is a plasma display panel; A filter formed on the front surface of the plasma display panel, wherein the filter includes an external light blocking sheet having a base portion and a pattern portion formed on the base portion and having a refractive index smaller than that of the base portion, and the external light blocking sheet The thickness of the pattern portion is 1.01 times to 2.25 times the height of the pattern portion is characterized in that the first and second internal angles formed by the upper, lower inclined surface and the lower end of the pattern portion is different from each other.

The second inner angle of the pattern portion is 1.01 times to 1.45 times, or 1.02 times to 1.32 times the first inner angle, and the second inner angle of the pattern portion is 81 to 115 degrees.

In addition, the interval between the pattern portion adjacent to each other is 1.1 to 5 times the width of the lower end of the pattern portion, the height of the pattern portion is 0.89 times to 4.25 times the interval between the pattern portion adjacent to each other, between the upper end of the pattern portion The interval of is characterized in that 1 to 3.25 times the interval between the bottom.

In addition, the refractive index of the pattern portion is characterized in that 0.300 times to 0.999 times the refractive index of the base portion.

The filter may further include an AR layer to prevent reflection of external light; A NIR shielding layer that shields near infrared rays emitted from the panel; And an EMI shielding layer that shields electromagnetic waves.

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

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

Referring to FIG. 1, the plasma display panel includes a scan electrode 11 and a sustain electrode 12, which are sustain electrode pairs formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

Each of the sustain electrode pairs 11 and 12 is typically a transparent electrode 11a or 12a formed of indium tin oxide (ITO), a metal such as silver (Ag), chromium (Cr), or chromium / copper. And the bus electrodes 11b and 12b which can be formed in a stack of / chromium (Cr / Cu / Cr) or in a stack of chromium / aluminum / chromium (Cr / Al / Cr). At this time, the bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to reduce the voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

In addition, the PDP has a function of light blocking to reduce the reflection and absorption of external light generated from the outside of the upper substrate 10, and to improve the purity of the upper substrate 10 and the contrast of the PDP. Black Matrix (BM) is formed.

The black matrix is formed between the first black matrix 15 formed at a position overlapping the partition wall 21 formed on the lower substrate 20, the transparent electrodes 11a and 12a and the bus electrodes 11b and 12b. It is composed of the second black matrices 11c and 12c formed. As such, the black matrix formed by separating the first and second black matrices 15, 11c, and 12c is called a separate type BM, and the second black matrix 11c and 12c is formed by forming a layer between the electrodes. It may also be called a layer or a black electrode layer.

An upper dielectric layer 13 and a protective layer 14 are stacked on the upper substrate 10 on which the scan electrode 11 and the sustain electrode 12 are formed, respectively, and charged particles, which generate plasma, are accumulated on the upper dielectric layer 13. . The protective layer 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 on the lower substrate 20 in a direction crossing the scan electrode 11 and the sustain electrode 12, and the lower dielectric layer 24 is formed on the lower substrate 20 on which the address electrode 22 is formed. ) And a partition wall 21 are formed, and phosphors 23 which emit light by ultraviolet rays generated during gas discharge and generate visible light are coated on the lower dielectric layer 24 and the partition wall 21.

The partition wall 21 includes a vertical partition wall 21a formed in a direction parallel to the address electrode 22 and a horizontal partition wall 21b formed in a direction crossing the address electrode 22 to physically distinguish discharge cells. Ultraviolet rays and visible light generated by the discharge are prevented from leaking to the adjacent discharge cells.

Since the structure of the panel shown in FIG. 1 is only an embodiment of the structure of the plasma display panel according to the present invention, the present invention is not limited to the structure of the plasma display panel shown in FIG. 1. For example, the PDP according to the present invention may have a structure in which each of the sustain electrode pairs 11 and 12 omits the transparent electrodes 11a and 12a made of ITO and includes only the bus electrodes 11b and 12b. Since this structure does not use the transparent electrodes 11a and 12a, there is an advantage that the unit cost of panel manufacturing can be reduced, and the bus electrodes 11b and 12b may be made of various materials such as photosensitive materials in addition to the materials listed above. All.

In addition, the partition structure of the PDP shown in FIG. 1 represents a close type in which the discharge cells are closed by the vertical partition 21a and the horizontal partition 21b, but the present invention is not limited thereto. The exhaust passage is provided in at least one of the stripe type, which is the omitted structure, the differential partition structure having a different height between the vertical partition 21a and the horizontal partition 21b, the vertical partition 21a or the horizontal partition 21b. A channel type barrier rib structure in which a usable channel is formed, a groove type barrier rib structure in which a groove is formed in at least one of the vertical barrier rib 21a or the horizontal barrier rib 21b, and the like may be used.

Here, in the case of the differential barrier rib structure, the height of the horizontal barrier rib 21b is more preferable, and in the case of the channel barrier rib structure or the groove barrier rib structure, it is preferable that the channel is formed in the horizontal barrier rib 21b or the groove is formed. 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, and the shape of the discharge cells may be not only rectangular but also various polygonal shapes such as pentagon and hexagon.

FIG. 2 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel are preferably arranged in a matrix form as shown in FIG. 2. The plurality of discharge cells are provided at the intersections of the scan electrodes Y1 to Ym, the sustain electrodes Z1 to Zm, and the address electrodes X1 to Xn, respectively. The scan electrodes Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrodes Z1 to Zm may be driven simultaneously. The address electrodes X1 to Xn may be driven by being divided into odd-numbered and even-numbered electrodes or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma display panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 2. For example, a dual scan method in which two scan electrodes of the scan electrodes Y1 to Ym are simultaneously scanned is possible, and the address electrodes X1 to Xn are divided up and down at the center of the panel. It may be driven.

FIG. 3 is a diagram illustrating an embodiment of a time division driving method in which one frame of an image is divided into a plurality of subfields in a PDP.

Referring to FIG. 3, a unit frame may be time-division driven into a predetermined number, for example, eight subfields SF1,..., SF8 to express the gray level of an image. Each subfield SF1, ..., SF8 is divided into a reset section (not shown), an address section A1, ..., A8, and a sustain section S1, ..., S8. .

In each address section A1, ..., A8, a data signal is applied to the address electrode X, and corresponding scan pulses are sequentially applied to each scan electrode Y. FIG. Sustain pulses are alternately applied to the scan electrode Y and the sustain electrode Z in each of the sustain periods S1, ..., S8, so that the discharge cells selected in the address periods A1, ..., A8 are alternately applied. Cause sustain discharge.

The luminance of the plasma display panel is proportional to the number of sustain discharges in the sustain periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gray levels, each subfield in turn has different sustain pulses at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of can be assigned. Alternatively, in order to obtain luminance of 133 gray levels, cells may be sustained by addressing cells during subfield 1, subfield 3, and subfield 8 sections.

Meanwhile, the number of sustain discharges allocated to each subfield may be variably determined according to the weights of the subfields. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, the plasma display panel may be driven by dividing one frame into eight or more subfields or the like, such as 12 or 16 subfields.

4A to 4F are cross-sectional views illustrating embodiments of a structure of an external light shielding sheet according to the present invention.

4A to 4F, the external light blocking sheet 100 of the present invention includes a base part 110 and a pattern part 120.

In general, external light that affects the brightness loss of the PDP is often present at the top of the user's head. Such external light is refracted toward the inside of the pattern portion 120 to be absorbed and blocked, and in order for total light reflection to occur on the inclined surfaces c and d of the pattern portion 120, the light emitted from the inside of the panel to display an image is generated. It is preferable to make the refractive index of the pattern portion 120 smaller than the refractive index of the base portion 110. In such a case, the external light is absorbed so that the external light is not reflected toward the observer side, and the reflection amount of the light emitted from the panel is increased to improve the clear contrast of the display image.

In order to maximize absorption of external light and total reflection of panel light in consideration of the angle of external light incident on the panel, the refractive index of the pattern part 120 is preferably 0.3 times to 0.999 times the refractive index of the base part 110. In order to maximize the total reflection of the light emitted from the panel on the inclined surface of the pattern portion 120, considering the vertical viewing angle of the plasma display panel, the refractive index of the pattern portion 120 is 0.3 times to 0.8 times the refractive index of the base portion 110. It is preferable to be a ship.

The base unit 110 is formed of a transparent plastic material having a predetermined refractive index in order to allow light to be transmitted smoothly and be refracted by a predetermined angle. For example, it is preferable that the resin is formed of a resin-based material formed by ultraviolet (UV) curing, but a rigid glass material may be used to increase the effect of protecting the entire surface of the panel.

In addition, the pattern portion 120 formed on the base portion 110 to block external light as much as possible has a cross-sectional shape having a larger width of the lower portion (b) than the upper portion (a). For example, it is preferable that the width of the top (a) is a triangular pointed shape close to zero, but may be formed to have a predetermined width to have a trapezoidal shape or may have a curved shape. In order to maximize the external light blocking effect of the external light shielding sheet 100, the upper end (a) of the pattern portion 120 is disposed to the user side (A) to which light is incident from the outside, the lower end (b) is the panel side (B) It is preferable to arrange.

In addition, the pattern portion 120 may have a darker color than the base portion 110 made of a transparent plastic material, and a material series having light absorption characteristics may be added to more effectively block and absorb light incident from the outside. Black series of materials may be added or applied to the surface.

In general, in order to block the external light existing at the top of the user's head and at the same time to secure a wider aperture ratio of the panel, the upper and lower sides of the pattern portion 2 and 2 are divided into upper and lower sides based on the position of the blocked external light source. The angles formed by the four inclined surfaces c and d are preferably formed different from each other. That is, the first internal angle θ1 formed by the upper inclined plane c and the lower end to which external light mainly affects the clear room contrast of the PDP is smaller than the second internal angle θ2 formed by the lower inclined plane d and the lower end. Preferably, the second internal angle θ2 of the pattern portion 120 is preferably 1.01 times to 1.45 times the first internal angle θ1.

When the second internal angle θ2 of the pattern portion 120 provided in the external light blocking sheet 100 is 1.02 times to 1.32 times the first internal angle θ1, the external light blocking sheet 100 is easily in a range where the pattern portion is easily manufactured. It is possible to secure the maximum aperture ratio, and to maximize the external light blocking effect and the internal light reflection of the panel.

Table 1 below shows the results of experiments of the aperture ratio of the external light blocking sheet 100 and whether the panel internal light passes through the first internal angle θ1 and the second internal angle θ2 of the pattern unit 120.

θ1 θ2 Aperture Internal light 80 degrees 80 degrees 50% ○ 80 degrees 82 degrees 60% ○ 80 degrees 85 degrees 63% ○ 80 degrees 87 degrees 65% ○ 80 degrees 90 degrees 68% ○ 80 degrees 92 degrees 70% ○ 80 degrees 95 degrees 73% ○ 80 degrees 98 degrees 75% ○ 80 degrees 100 degrees 78% ○ 80 degrees 105 degrees 80% ○ 80 degrees 110 degrees 83% △ 80 degrees 115 degrees 85% △ 80 degrees 120 degrees 88% X 80 degrees 125 degrees 90% X

Referring to Table 1, when the first internal angle θ1 of the pattern portion 120 is 80 degrees, the second internal angle θ2 of the pattern portion 120 must be formed higher than 80 degrees to provide contrast to the contrast ratio of the panel. The aperture ratio is gradually increased while the aperture ratio is over 50%, which can minimize the loss of transmission amount. However, when the second internal angle θ2 is 120 degrees or more, the aperture ratio is improved to 88% or more, but light emitted from the inside of the panel cannot pass.

That is, when the second internal angle θ2 of the pattern portion 120 is 1.01 times to 1.45 times larger than the first internal angle θ1, the aperture ratio of the external light shielding sheet 100 may be sufficiently secured, and the light emitted from the inside of the panel may be obtained. This can be sufficiently passed out. In addition, in order to maximize the opening ratio and the passage rate of the panel internal light in consideration of ease of manufacturing process, the second internal angle θ2 of the pattern portion 120 may be 1.02 times to 1.32 times larger than the first internal angle θ1, and the second internal angle (θ2) may be preferably formed at 81 to 115 degrees.

As shown in FIG. 4A, the external light shielding sheet 100 having the acute angle smaller than 90 degrees between the first internal angle θ1 of the pattern portion 120 and the second internal angle θ2 larger than the first internal angle θ1 is formed. As shown in FIG. 4B, a second inner angle θ2 larger than the first inner angle θ1 of the pattern portion 120a may be formed at a right angle, and as shown in FIG. 4C. The first internal angle θ1 of the portion 120b and the second internal angle θ2 larger than 90 degrees may be formed at an obtuse angle smaller than 115 degrees. At this time, the opening ratio is improved as the second internal angle θ2 larger than the first internal angle θ1 of the pattern portion 120 is increased, but the light emitted from the panel is totally reflected at the pattern portion 120 to reach the user. In order to be able to do so, the second inner angle θ2 of the pattern portion 120 may be formed at an angle smaller than 115 degrees as described in Table 1 above.

In addition, the pattern portion 120 of the external light blocking sheet 100 may have a polygonal shape such as a quadrangle, a trapezoid, etc., not a triangle, as shown in FIG. 4D, and as shown in FIG. In the cross-sectional shape, the top a may be formed in a curved line.

Here, the structure of the external light shielding sheet of the present invention will be described in more detail with reference to FIGS. 4E to 4F. When the thickness T of the external light shielding sheet is 20 μm to 250 μm, the manufacturing process may be easy and may have an appropriate light transmittance. In order to smoothly transmit the light emitted from the panel, the light incident from the outside is refracted to be effectively absorbed and blocked by the pattern unit 120, and to secure the sheet, the thickness T of the external light blocking sheet is 100 μm to 180 μm.

In addition, when the height (h) of the pattern portion provided in the external light shielding sheet is 80㎛ to 170㎛, it is the most easy to manufacture the pattern portion, it is possible to ensure the appropriate opening ratio of the external light blocking sheet, and the external light blocking effect and emitted from the panel Maximize the light reflection effect.

The height h of the pattern portion may vary according to the thickness T of the external light shielding sheet. In general, since the external light incident on the panel affects the decrease in bright room contrast mainly located above the position of the panel, in order to effectively block external light incident on the panel, the height h of the pattern portion is the thickness of the external light shielding sheet ( It is preferable to have a value within a certain ratio range for T).

Referring to FIG. 4F, 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 breakdown may occur. As the height h of the pattern portion decreases, the external light panel having an angle within a predetermined range is reduced. It is incident to the outside light blocking is not made properly.

Table 2 below shows the results of experiments on the effects of the breakdown and the external light blocking effect 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 part  Height (h) Dielectric breakdown Outer light  block 120 μm 120 μm ○ ○ 120 μm 115 ㎛ △ ○ 120 μm 110 ㎛ X ○ 120 μm 105㎛ X ○ 120 μm 100 μm X ○ 120 μm  95 ㎛ X ○ 120 μm  90 μm X ○ 120 μm  85 μm X ○ 120 μm  80㎛ X ○ 120 μm  75 μm X △ 120 μm  70 ㎛ X △ 120 μm  65 μm X △ 120 μm  60㎛ X △ 120 μm  55 μm X △ 120 μm  50 μm X X

Referring to Table 2, when the thickness T of the external light shielding sheet is 120 μm, when the height h of the pattern part is formed to be 120 μm or more, there is a risk that the pattern part is insulated and destroyed, thereby increasing the defective rate of the product. When 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 sheet. However, when the height h of the pattern portion is formed to be 75 μm or less, the efficiency of blocking external light by the pattern portion may be reduced, and when formed to 50 μm or less, external light may be incident on the panel.

When the thickness T of the external light shielding sheet 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, the thickness T of the external light shielding sheet is 1.01 times the height of the pattern portion h in order to prevent dielectric breakdown and external light incident on the panel, and to increase the reflectance of the light emitted from the panel and to sufficiently secure the viewing angle. It may be 1.5 times.

Referring to FIG. 4F, the opening width of the external light blocking sheet including the pattern part is secured, the external light blocking effect and the panel internal light reflection efficiency are maximized, and the bottom width P1 of the pattern part is 18 μm to 35 in consideration of ease of manufacture. It is preferably formed in 탆.

In order to secure the aperture ratio for displaying the display image having an appropriate brightness by emitting the panel light to the user side, and to secure the inclination of the inclined plane of the pattern part 120 to increase the external light blocking effect and the panel light reflection efficiency, adjacent patterns are adjacent to each other. The shortest distance P2 between the parts may be 40 μm to 90 μm, and the interval P3 between the upper ends of the pattern parts adjacent to each other may be 60 μm to 130 μm.

For the above reason, when the shortest distance P2 between two adjacent pattern parts is 1.1 to 5 times the width of the lower end of the pattern part 120, the aperture ratio for the display can be secured. In addition, in order to secure the aperture ratio and optimize the external light blocking effect and the panel light reflection efficiency, the shortest distance P2 between two adjacent pattern parts may be 1.5 to 3.5 times the width of the bottom of the pattern part 120.

Table 3 below shows the results of experiments on the opening ratio and the external light blocking effect of the external light blocking sheet according to the width at the bottom width P1 of the pattern portion of the external light blocking sheet 100 and the middle of the height of the pattern portion (h / 2). This is the case where the bottom bottom width is 23 µm.

pattern Bottom width pattern Center width Aperture Outer light  block 23.0㎛ 23.0㎛ 50% ○ 23.0㎛ 22.0㎛ 55% ○ 23.0㎛ 20.0 ㎛ 60% ○ 23.0 ㎛ 18.0㎛ 65% ○ 23.0㎛ 16.0㎛ 70% ○ 23.0㎛ 14.0㎛ 72% ○ 23.0㎛ 12.0㎛ 75% ○ 23.0㎛ 10.0㎛ 78% ○ 23.0㎛  9.0 μm 80% ○ 23.0㎛  8.0㎛ 83% △ 23.0㎛  6.0 μm 85% △ 23.0㎛  5.0㎛ 90% X

Referring to Table 3, when the bottom width P1 of the pattern portion of the exterior light shielding sheet 100 is 23.0 μm, the light emitted from the inside of the panel is formed when the width at the center of the pattern portion h / 2 is 23 μm or less. This is passed to the user side to ensure an appropriate opening ratio of 50% or more to display an image. However, when the width at the center of the pattern portion (h / 2) is formed to 8 μm or less, the efficiency of blocking external light may be reduced, and when formed to 5 μm or less, external light may be incident on the panel.

Therefore, when the width at the center height (h / 2) of the pattern portion of the external light shielding sheet is 1 to 3.5 times or 1.5 to 2.5 times the lower width P2, external light may be prevented from entering the panel. Appropriate opening ratio can be secured.

Also, in consideration of the angle at which external light enters into the panel, the height h of the pattern portion has a ratio of 0.89 to 4.25 times the shortest distance between the adjacent pattern portions, in which case the reflectance of the light emitted from the panel and The external light blocking efficiency is maximized, and the upper and lower viewing angles according to the height (h) of the pattern portion can be sufficiently secured.

In addition, in order to ensure the maximum aperture ratio of the external light shielding sheet, the distance between the upper ends of the pattern parts adjacent to each other is formed to be 1 to 3.25 times the shortest distance between the adjacent pattern parts to secure the aperture ratio and maximize the external light blocking efficiency. .

5 is a front view showing an external light shielding sheet according to the present invention.

As shown in FIG. 5, the pattern parts 120 are preferably formed at predetermined intervals in a row on the base part 110. In FIG. 5, the pattern part 120 is formed in parallel with the top or bottom of the external light blocking sheet 100, but may be formed at an angle with the top or bottom of the external light blocking sheet at an angle. In such a case, it is possible to prevent the moire phenomenon caused by the black matrix and the black layer inside the panel, the partition, the bus electrode, and the like. Moiré is a low-frequency pattern that occurs when a similar lattice pattern overlaps, for example, a wave pattern that appears when mosquito nets overlap. The moiré phenomenon is not only related to the angle of the pattern portion forming the upper or lower portion of the external light shielding sheet, but also to the width of the bottom portion of the pattern portion which is substantially the same as the width of the pattern portion, and the width of the bus electrode and the vertical partition wall formed in the panel.

Table 4 below shows the results of experiments on whether moiré occurred and external light blocking effect according to the ratio of the width of the bottom of the pattern portion of the external light blocking sheet to the width of the bus electrode formed on the upper substrate of the panel. If it is.

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 4, when the width of the bottom of the pattern portion is 0.2 times to 0.5 times the width of the bus electrode, it is possible to reduce the moiré phenomenon and reduce the external light incident to 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 5 below shows the results of experiments on the occurrence of moiré phenomenon and external light blocking effect according to the ratio of the width of the bottom of the pattern portion of the external light blocking sheet to the width of the vertical partition formed on the lower substrate of the panel. If

Width of pattern bottom / width of vertical bulkhead Moire Exterior light blocking 0.10 ○ × 0.15 △ × 0.20 △ × 0.25 △ × 0.30 × △ 0.35 × △ 0.40 × ○ 0.45 × ○ 0.50 × ○ 0.55 × ○ 0.60 × ○ 0.65 × ○ 0.70 △ ○ 0.75 △ ○ 0.80 △ ○ 0.85 ○ ○ 0.90 ○ ○

Referring to Table 5, when the width of the bottom of the pattern portion is 0.3 times to 0.8 times the width of the vertical partition wall, it is possible to reduce the moiré phenomenon and reduce the external light incident on the panel. In addition, in order to prevent moiré phenomenon and effectively block external light, and to secure an aperture ratio for emitting panel light, the width of the lower end of the pattern portion is preferably 0.4 times to 0.65 times the width of the vertical partition wall.

6A to 7B are sectional views showing embodiments of the structure of the filter according to the present invention. The filter formed on the front surface of the plasma display panel includes an AR / NIR sheet, an EMI shield sheet, an external light shield sheet, and an optical characteristic sheet. And the like.

6A to 7B, the AR / NIR sheet 210 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 213 made of a transparent plastic material. (Anti-Reflection) layer 211 is attached to the rear, shielding the near-infrared radiation emitted from the panel to the NIR (Near Infrared) shielding layer (NIR) shielding so that the signals transmitted using infrared rays, such as a remote control, can be normally transmitted ( 212) is attached. In this case, the base sheet 213 may be applied to various materials in consideration of transparency, insulation, heat resistance, mechanical strength, and the like, which can withstand the use conditions or manufacturing. For example, polyester-based resins, polyamide-based resins, polyolefin-based resins, vinyl-based resins, acrylic resins, cellulose-based resins, and the like may be used, and generally have good transparency and a polyethylene having a visible light transmittance of 80% or more. It is preferable to be formed of a polyester-based material such as telephthalate (PET), polyethylene naphthalate, etc., and the thickness of the base sheet 213 is not enough mechanical strength to prevent the sheet from being damaged, and the thickness is larger than necessary. It may be desirable to form 50 μm to 500 μm in consideration of not spending the cost.

A general anti-reflection film may be applied to the AR layer 211. The NIR shielding layer 212 has a near-infrared transmittance of 20% or less, preferably 10% or less, in a wavelength range of 800 nm to 1100 nm, which the PDP emits. It is formed using a near infrared absorbent to the extent that it can be provided. As a material of the near-infrared absorber, for example, a polymethine-based, cyanine-based compound, a butaroocyanine-based compound, a nattarocyanine-based compound, a naphthoquino-based compound, an anthraquinone-based compound, Near-infrared absorption pigments, such as a thiol type compound, an immonium type compound, and a dimonium type compound, are mentioned.

EMI shielding sheet 220 is attached to the EMI shielding layer 221 on the front of the base sheet 222 made of a transparent plastic material to shield the electromagnetic interference (EMI) to prevent the EMI emitted from the panel to be emitted to the outside . In this case, the EMI shielding layer 221 typically has a mesh-shaped pattern using a conductive material, and the EMI shielding sheet outside the pattern, that is, the image is not displayed for the grounding of the EMI shielding layer ( In the non-effective area of 220, a conductive material is applied as a whole. Here, as a material of the metal layer forming the pattern of the EMI shielding sheet, for example, gold, silver, iron, nickel, chromium, aluminum, etc., a metal having a conductivity sufficient to shield the radio waves can be used, formed of a single material It may be formed and may be formed of an alloy or a multilayer. In addition, the lower surface of the pattern is blackened to improve the clear contrast of the panel, such as a black matrix formed inside the panel. At least one of the outer circumferential surfaces of the pattern is blackened to have a darker color than the base portion. In such a case, when external light such as sunlight or electric lamp light enters the panel, reflection is suppressed and absorbed from the blackened portion, so that the display image of the PDP can be improved with high contrast. As a blackening method, a plating method is preferable, and in such a case, it is excellent in adhesiveness and all the surfaces of a pattern can be blackened easily. As the plating material, at least one selected from copper, cobalt, nickel, zinc, tin, and chromium, or two or more compounds such as oxide compounds such as copper oxide, copper dioxide, and iron oxide may be used.

It is preferable that the pattern width of the EMI shielding layer is formed to be 10 μm to 30 μm, in which case it may have a sufficient electric resistance value for electromagnetic shielding, and an opening ratio for proper light transmittance can be ensured.

Typically, the external light source is most often present in the interior or exterior of the user's head. The external light blocking sheet 230 is attached to effectively block the external light so that the black image of the PDP can be darker.

The adhesive 240 forms a layer between the AR / NIR sheet 210, the EMI shielding sheet 220, and the external light shielding sheet 230, and each sheet and filter may be firmly installed at the front of the panel. To help. In addition, it is preferable that the material of the base sheet included in each sheet is substantially the same material in consideration of the ease of manufacturing the external light blocking sheet.

Meanwhile, in FIG. 6A, an AR / NIR sheet 210, an EMI shield sheet 220, and an external light shielding sheet 230 are stacked in this order. However, as illustrated in FIG. 6B, the AR / NIR sheet 210 is stacked. As the external light blocking sheet 230 and the EMI shielding sheet 220 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 layer of each sheet may be omitted.

7A to 7B, the filter 300 installed in front of the panel may include the AR / NIR sheet 310, the EMI shield sheet 330, and the external light shield sheet 340 as illustrated in FIGS. 6A and 6B. In addition to the photosensitive sheet 320 may further include. The optical sheet 320 improves the color temperature and luminance characteristics of light incident from the panel, and the optical layer 321 made of a predetermined dye and an adhesive is laminated on the front or rear of the base sheet 322 made of a transparent plastic material. do.

At least one of the basesheets included in each sheet shown in FIGS. 6A to 7B may be omitted, and any one of the basesheets may be made of hard glass, which is not made of plastic. It can improve the protection function. At this time, the glass is preferably formed spaced apart from the panel at a predetermined interval.

8 is a view showing the structure of a plasma display device according to the present invention.

Referring to FIG. 8, 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, EL (Electro Magmetic Interferenc e) shielding sheets, optical properties sheets, and the like.

An adhesive having a thickness of 10 μm to 30 μm is formed between the filter 100 and the panel to form a layer to facilitate adhesion of the panel and the filter 100, and at the same time, to improve adhesiveness. In addition, in order to protect the panel from external pressure, the adhesive layer may be formed to have a thickness of 30 μm to 120 μm between the filter 100 and the panel.

As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and drawings disclosed herein, and is easily used by those skilled in the art within the technically protected scope of the present invention. It is possible.

Plasma display device of the present invention configured as described above includes an external light shielding sheet to ensure that the opening ratio of the panel is secured at the same time to absorb and block the light incident from the outside, it is possible to effectively implement the black image of the PDP, the screen There is an effect of improving the whee.

Claims (30)

A plasma display panel; And A filter installed in front of the plasma display panel; The filter, A base portion; And An external light shielding sheet having a plurality of pattern portions formed on the base portion, The pattern part includes a lower end, an upper inclined surface and a lower inclined surface connected to the lower end, and the thickness of the external light shielding sheet is 1.01 to 1.5 times the height of the pattern part, and the first inner angle formed by the upper inclined surface and the lower end of the pattern part. Is different from the second internal angle formed by the lower inclined surface and the lower end of the plasma display apparatus. According to claim 1, And the first cabinet is smaller than the second cabinet. According to claim 1, And the second cabinet is 1.01 to 1.45 times larger than the first cabinet. According to claim 1, And the second cabinet is 1.02 to 1.32 times larger than the first cabinet. According to claim 1, And the second cabinet is 81 degrees to 115 degrees. According to claim 1, And the bottom width of the pattern portion is 1 to 3.5 times the width at the middle height of the pattern portion. According to claim 1, The interval between the lower end of the pattern portion adjacent to each other is a plasma display device, characterized in that 1.1 to 5 times the width of the lower end of the pattern portion. According to claim 1, The height of the pattern portion is a plasma display device, characterized in that 0.89 times to 4.25 times the interval between the lower end of the pattern portion adjacent to each other. According to claim 1, The interval between the upper end of the pattern portion adjacent to each other is a plasma display device, characterized in that 1 times to 3.25 times the interval between the lower end. According to claim 1, The refractive index of the pattern portion is smaller than the refractive index of the base portion plasma display device. According to claim 1, And a refractive index of the pattern portion is 0.300 times to 0.999 times the refractive index of the base portion. According to claim 1, The filter, An anti-reflection layer for preventing reflection of external light; A near infrared shielding layer for shielding near infrared rays emitted from the panel; And And at least one of electromagnetic shielding layers for shielding electromagnetic waves. According to claim 1, Plasma display device, characterized in that the bottom width of the pattern portion is 18㎛ 35㎛. According to claim 1, The height of the pattern portion is a plasma display device, characterized in that 80㎛ to 170㎛. According to claim 1, The interval between the lower end of the pattern portion adjacent to each other is a plasma display device, characterized in that 40㎛ to 90㎛. A base portion; And An external light shielding sheet having a plurality of pattern portions formed on the base portion, The pattern portion includes a lower, upper inclined surface and lower inclined surface connected to the lower, The thickness of the external light shielding sheet is 1.01 to 1.5 times the height of the pattern portion, and the first inner angle formed by the upper inclined surface and the lower end of the pattern portion is different from the second inner angle formed by the lower inclined surface and the lower end. Filter. The method of claim 16, And the first cabinet is smaller than the second cabinet. The method of claim 16, The second cabinet is a filter, characterized in that 1.01 times to 1.45 times the first cabinet. The method of claim 16, The second cabinet is a filter, characterized in that from 1.02 times to 1.32 times the first cabinet. The method of claim 16, The second cabinet is a filter, characterized in that 81 to 115 degrees. The method of claim 16, The bottom width of the pattern portion is a filter, characterized in that 1 to 3.5 times the width at the middle height of the pattern portion. The method of claim 16, The interval between the lower end of the pattern portion adjacent to each other is a filter, characterized in that 1.1 to 5 times the width of the bottom of the pattern portion. The method of claim 16, The height of the pattern portion is a filter, characterized in that 0.89 times to 4.25 times the interval between the lower end of the pattern portion adjacent to each other. The method of claim 16, The interval between the upper end of the pattern portion adjacent to each other is a filter, characterized in that 1 to 3.25 times the interval between the lower end. The method of claim 16, An anti-reflection layer for preventing reflection of external light; A near infrared shielding layer for shielding near infrared rays emitted from the panel; And And at least one of electromagnetic shielding layers for shielding electromagnetic waves. The method of claim 16, The refractive index of the pattern portion is a filter, characterized in that 0.300 times to 0.999 times the refractive index of the base portion. delete The method of claim 16, The external light blocking sheet has a thickness of 100um to 180um. The method of claim 16, The pattern portion is characterized in that the filter is 80um to 110um. delete

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