KR100730191B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to reduce reflecting luminance and improve light room contrast by coloring a front substrate and barrier ribs. A front substrate(111) is colored with a first color. Visible rays penetrate the front substrate. A rear substrate(121) is disposed opposite to the front substrate. A plurality of barrier ribs(130) are arranged between the front substrate in order to define a plurality of discharge cells. The barrier ribs are colored with a second color. The first color and the second color are subtracted from each other or are added to each other. The front substrate includes a first coloring material for absorbing selectively light of 800 to 1200 micrometers.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view of a typical plasma display panel.

2 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2.

4 is an explanatory diagram schematically showing a color wheel.

FIG. 5 is a modified example of the plasma display panel shown in FIG. 2.

<Brief description of symbols for the main parts of the drawings>

100: plasma display panel

111: front substrate 115: front dielectric layer

116: shield 121: back substrate

122: address electrode 125: rear dielectric layer

130, 130 ': bulkhead 131: X electrode

132: Y electrode 170: discharge cell

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having high clear room contrast.

The general AC plasma display panel 10 includes an upper plate 50 showing an image to a user and a lower plate 60 coupled in parallel with each other, as shown in FIG. 1. On the front substrate 11 of the upper plate 50, a pair of sustain electrodes 12, which are paired with the X electrode 31 and the Y electrode 32, is arranged, and the pair of sustain electrodes 12 of the front substrate 11 is disposed. On the rear substrate 21 of the lower substrate 60 opposite to the disposed surface, the address electrodes 22 are disposed to intersect the electrodes 31 and 32 of the front substrate 11. The front dielectric layer 15 and the rear dielectric layer 25 are formed on each surface of the front substrate 11 and the back substrate 21 to bury the electrodes. A protective layer 16, usually made of MgO, is formed on the rear surface of the front dielectric layer 15, and a partition wall maintains a discharge distance on the front surface of the rear dielectric layer 25 and prevents electro-optic crosstalk between discharge cells. 30 is formed. Red, green, and blue light emitting phosphors 26 are coated on both sides of the partition wall 30 and on the front surface of the front dielectric layer 25 in which the partition wall 30 is not formed.

Each of the X electrode 31 and the Y electrode 32 includes transparent electrodes 31a and 32a and bus electrodes 31b and 32b. The space formed by the pair of X electrodes 31 and Y electrodes 32 arranged in this way and the address electrodes 22 intersecting the same form one discharge unit as the unit discharge cells 70.

However, in the plasma display panel, since the luminance of reflection generated by the reflection of external light on the plasma display panel is very large, there is a disadvantage that the clear room contrast is not good.

An object of the present invention is to provide a plasma display panel having high clear room contrast.

According to the present invention, visible light can pass therethrough, and at least a portion of the front substrate is colored between the first substrate, a rear substrate disposed to face the front substrate, and disposed between the front substrate and the rear substrate. It provides a plasma display panel that partitions discharge cells and includes a partition wall colored in a second color, wherein the first color and the second color are subtracted and mixed with each other.

According to another aspect of the invention, the present invention is visible light can pass through, at least a portion of the first substrate is colored in a first color, the rear substrate disposed to face the front substrate, the front substrate and the back A plasma display panel is disposed between a substrate, partitions a plurality of discharge cells, and includes a partition wall colored in a second color.

In the present invention, the front substrate preferably includes a first coloring material that selectively absorbs light having a wavelength of about 800 to about 1200 nm. In this case, the first coloring material preferably includes at least one selected from the group consisting of CoO, FeO, Fe ₂ O ₃ , CuO, FeO, VO ₂ and NiO.

In addition, in the present invention, the front substrate and the partition wall include a first coloring material and a second coloring material, respectively, the first and second coloring material is Ti, V, Cr, Mn, Fe, It is preferred to include at least one selected from the group consisting of Co, Ni, Cu, Mo, Ru, Pt, U, Nd, Er, Pr, Ce, Sm, Eu, Tb, Dy, Ho, Tm, Ag and Cd .

In the present invention, the first color and the second color are preferably complementary to each other.

In addition, in the present invention, only the upper surface visible from the front of the partition wall may be partially colored or entirely colored.

In addition, in the present invention, the front substrate preferably has a light transmittance of 60% or less having a wavelength of about 800 to about 1200 nm.

Moreover, in this invention, it is preferable that the said partition is closed.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, a plasma display panel 100 according to a preferred embodiment of the present invention is shown. 2 is a partially cutaway perspective view of the plasma display panel 100, and FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

The plasma display panel 100 includes a front panel 150 and a rear panel 160 that are largely opposed to and coupled to each other. The front panel includes a front substrate 111, sustain electrode pairs 112, a protective layer 116, and a front dielectric layer 115, and the back panel 160 includes a rear substrate 121 and a rear dielectric layer 125. ), Address electrodes 122, barrier ribs 130, and phosphor layers 126, and a discharge gas (not shown) is filled in the space between the front panel 150 and the rear panel 160. Look in detail below.

The front substrate 111 generally includes glass. The front substrate 111 is colored in the first color as a whole. Various colors may be selected as the first color, but are preferably colored. The front substrate 111 may be formed by mixing a first coloring material on a glass paste for manufacturing the front substrate. The first coloring material is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Ru, Pt, U, Nd, Er, Pr, Ce, Sm, Eu, Tb, Dy, Ho, Tm, Including at least one of Ag or Cd, the front substrate 111 is colored in a desired color.

In general, when driving the plasma display panel, near infrared rays may be generated. The near infrared ray has a wavelength of 800 nm to 1200 nm, and since the wavelength region of the near infrared ray overlaps with 800 nm to 1000 nm, which is a wavelength region of electromagnetic waves generally used in a remote control device, when the near infrared ray is not shielded, It may cause malfunction of peripheral electronics. Accordingly, the front substrate 111 preferably includes a first coloring material that selectively absorbs light having a wavelength of about 800 nm to about 1200 nm. The first colored material preferably includes at least one of CoO, FeO, Fe ₂ O ₃ , CuO, FeO, VO _2, or NiO. For example, the first coloring material may include 1 to 15 wt% CuO, 200 to 7000 ppm (wt) FeO / Fe ₂ O ₃ , and 10 to 1000 ppm (wt) CoO. When the first coloring material is included, the front substrate 111 may have a blue color.

In order to block near infrared rays, it is preferable that the transmittance of near infrared rays having a wavelength of about 800 to about 1200 nm in the front substrate 111 is 60% or less.

As described above, since the near infrared ray is absorbed by the front substrate 111, it is not necessary to arrange a separate filter for blocking the near infrared ray on the front surface of the plasma display panel. Therefore, the plasma display panel can be reduced in weight, the manufacturing process is simplified, and the cost can be reduced.

The rear substrate 121 is disposed to face each other at a predetermined interval from the front substrate 111, and is preferably formed of a material including glass.

A partition wall 130 is formed between the front substrate 111 and the rear substrate 121 to partition the plurality of discharge cells 170 in which the discharge phenomenon occurs. The partition partitions the discharge cells in a matrix form, but the present invention is not limited thereto. The partition 130 performs a function of preventing optical crosstalk between the discharge cells 170. Referring to FIG. 2, the partition wall 130 intersects the first partition wall portions 130a and the first partition wall portions 130a that are disposed in the direction in which the address electrodes 122 extend (y direction). The second partition walls 130b in the (x direction) may be formed, and the discharge cells 170 may be formed to have a rectangular cross section. However, the shape of the partition is not limited to the aforementioned closed partition. That is, the partition wall may have an open partition wall such as a stripe. In particular, in the closed partition wall, the cross section of the discharge cell may be formed to be a polygon, such as a triangle, a square, a pentagon, or a circle, an ellipse, or the like.

The partition 130 is entirely colored in a second color. Various colors may be selected as the second color, but are preferably colored. The coloring method of the partition 130 may be variously selected, and the partition wall may be manufactured by mixing a second coloring material with a dielectric paste for partition wall manufacture. The second coloring material is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Ru, Pt, U, Nd, Er, Pr, Ce, Sm, Eu, Tb, Dy, Ho, Tm, Including at least one of Ag or Cd, the partition 130 is colored in a desired color.

The first color of the front substrate 111 and the second color of the partition wall 130 are colors that are in a subtractive mixture relationship with each other. The subtraction mixing method is a method of subtracting any one color element from white to make a color. Referring to FIG. 4, three primary colors of a color are magenta, magenta, cyan, and cyan. When two colors in complementary color relation are mixed, gray or black It becomes the same achromatic color. There is a combination of red and indigo, green and orange guitars. The combination is a case where one of the three primary colors is combined, and there are many combinations of complementary colors. Subtractive blending decreases the brightness and saturation as the blend is mixed, and near-field blending becomes a neutral color in the color circle, while blending of far-field colors decreases the brightness and saturation, making it closer to gray and blending complementary colors to black. It has an attribute that comes close to it. Such subtractive mixing is caused by absorption and selective transmission or reflection of light, essentially because of red absorption, green absorption and blue absorption.

As described above, since the first color and the second color are subtracted and mixed, when the first color and the second color are overlapped, the color is darker, so that the luminance of reflection by visible light incident from the outside is greatly reduced. Thus, the clear room contrast of the plasma display panel is improved. In particular, when the first color and the second color have a complementary color relationship with each other, when they are mixed, they appear to be close to black, and thus the light absorption rate is further increased, thereby improving the clear room contrast.

The visible light generated by the discharge cells 170 passes through the front substrate 111 and is projected to the outside. At this time, when the generated visible light is absorbed by the front substrate 111, the brightness of the plasma display panel is reduced. In addition, even when the generated visible light is absorbed by the partition wall 130 or transmitted through the partition wall 130 and projected in another direction, the luminance is reduced. Therefore, the front substrate 111 should have excellent visible light transmittance, and the partition wall 130 is preferably excellent in visible light reflectance. That is, the front substrate 111 is preferably colored in a first color having better visible light transmittance than the partition 130, and the partition 130 is colored in a second color having better visible light reflectance than the front substrate 111. It is desirable to be.

Since the portion where the front substrate 111 and the partition wall 130 overlap and appear dark is mainly a non-discharge area, the decrease in luminance due to the front substrate 111 itself is not large. In addition, since the partition wall 130 has a closed structure, an area overlapping with the front dielectric layer 115 is increased, so that the clear room contrast is greatly improved without decreasing the luminance.

On the front substrate 111 facing the rear substrate 121, the pair of sustain electrodes 112 are arranged in parallel at predetermined intervals. Each sustain electrode pair 112 includes an X electrode 180 and a Y electrode 190, and the X electrode 180 and the Y electrode 190 cause plasma discharge in the discharge cell 170.

Each of the X electrode 131 and the Y electrode 132 includes transparent electrodes 131a and 132a and bus electrodes 131b and 132b. The transparent electrodes 131a and 132a are formed of a transparent material that is a conductor capable of causing a discharge and does not prevent light emitted from the phosphor 126 from advancing to the front substrate 111. Such a material is indium tin (ITO). oxide). However, transparent conductors such as ITO generally have a large resistance, and thus, when the discharge electrodes are formed only by the transparent electrodes, the voltage drop in the longitudinal direction is large, which consumes a lot of driving power and slows the response speed. To this end, bus electrodes 131b and 132b made of a metal material and formed in a narrow width are disposed on the transparent electrode. The bus electrode may be formed in a single layer structure using a metal such as Ag, Al, or Cu, but may be formed to have a multilayer structure such as Cr / Al / Cr. Such transparent electrodes and bus electrodes are formed using a photo etching method, a photolithography method, or the like.

Looking at the shape and arrangement of the X electrode 131 and the Y electrode 132 in detail, the bus electrodes 131b and 132b are spaced apart at predetermined intervals from the unit discharge cells 180 and disposed in parallel to each other. 180 extend across them. As described above, the transparent electrodes 131a and 132a are electrically connected to each of the bus electrodes 131b and 132b, and the rectangular transparent electrodes 131a and 132a are discontinuously disposed for each unit discharge cell 180. One side of the transparent electrodes 131a and 132a is connected to the bus electrodes 131b and 132b, and the other side thereof is disposed to face the center direction of the discharge cell 180.

The front dielectric layer 115 is formed on the front substrate 111 to fill the discharge electrode pairs 112. The front dielectric layer 115 prevents adjacent X electrodes 131 and Y electrodes 132 from being energized with each other, and at the same time, charged particles or electrons are applied to the X electrodes 131 and Y electrodes 132. Direct collision prevents damage to the X electrodes 131 and the Y electrodes 132. In addition, the front dielectric layer 115 performs a function of inducing charge.

On the front dielectric layer 115, a protective layer 116, which is usually made of MgO, is formed. The protective layer 116 prevents cations and electrons from colliding with the front dielectric layer 115 during the discharge to damage the front dielectric layer 115, and has good light transmittance and emits a lot of secondary electrons during the discharge. In particular, the protective layer 116 is mainly formed of a thin film using sputtering, electron beam deposition, or the like.

The address electrodes 122 are disposed to intersect the X electrodes 131 and the Y electrodes 132 on the back substrate 121 opposite to the front substrate 111. The address electrodes 122 are intended to cause an address discharge to facilitate sustain discharge between the X electrodes 131 and the Y electrodes 132, and more specifically, serve to lower a voltage for sustain discharge. . The address discharge is a discharge that occurs between the Y electrodes 132 and the address electrodes 122.

The rear dielectric layer 125 is formed on the rear substrate 121 to fill the address electrodes 122. The back dielectric layer 125 is formed of a dielectric. In addition, the rear dielectric layer 125 prevents cations or electrons from colliding with the address electrodes 122 to damage the address electrodes 122 during discharge and induce charge.

Red, green, and blue light emitting phosphor layers 126 are formed on the rear dielectric layer 125 between the partition walls 130 partitioning the discharge cells 170 and on the side surfaces of the partition walls 130. The phosphor layers 126 have a component that generates ultraviolet light by receiving ultraviolet rays, and the red phosphor layers formed in the red discharge cells include phosphors such as Y (V, P) O ₄ : Eu, and green discharges. The green light emitting phosphor layers formed in the cells include a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light emitting phosphor layers formed in the blue discharge cells include a phosphor such as BAM: Eu.

In addition, the discharge cells 180 are filled with a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed, and in the state where the discharge gas is filled as described above, the front and rear substrates 111 and 121 of the substrates are filled. The front substrate and the back substrates 111 and 121 are sealed to each other and joined by a sealing member such as frit glass formed at the edge thereof.

Referring to the operation of the plasma panel 100 according to the present invention configured as described above are as follows.

The address discharge is caused by the application of an address voltage between the address electrodes 122 and the Y electrodes 132, and as a result of the address discharge, the discharge cells 170 for sustain discharge are selected. After that, when a sustain voltage is applied between the X electrodes 131 and the Y electrodes 132 of the selected discharge cells 170, the sustain discharge is generated.

 In this manner, ultraviolet rays are emitted while the energy level of the discharged gas excited during the sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 126 applied in the discharge cells 170. The energy level of the excited phosphor layer 126 is lowered to emit visible light, and the emitted visible light forms an image. do.

5 is a sectional view showing a modification of this embodiment. Here, the same reference numerals as in the above embodiment denote the same members. Referring to FIG. 5, the barrier rib 130 ′ includes a lower barrier rib portion 130bb disposed on the rear dielectric layer 125 and an upper barrier rib portion 130aa disposed on the lower barrier rib portion 130bb. . In this case, the upper partition wall portion 130aa is colored with a second color subtracted from the first color of the front dielectric layer 115. It is preferable that the said 1st color and the 2nd color are chromatic colors, respectively. Further, the first color and the second color are more preferably complementary to each other.

The lower partition wall part 130bb is colored in a white color to improve visible light reflectance.

Even when only the front substrate 111 and the upper partition wall portion 130aa are subtracted and mixed, since the user views the plasma display panel through the front substrate 111, the upper partition portion (130bb) is not seen. 130aa). Therefore, even if only the upper partition wall part 130aa is colored by the color subtracted from the said 1st color, the bright room contrast is improved.

In the plasma display panel according to the present invention, since the front substrate and the partition wall are colored, the reflection brightness is reduced and the clear room contrast is improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (20)

Visible light can pass through, the front substrate colored in the first color; A rear substrate disposed to face the front substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning a plurality of discharge cells and colored in a second color; And the first and second colors are subtracted from each other. The method of claim 1, The front substrate includes a first colored material for selectively absorbing light having a wavelength of 800 to 1200nm. The method of claim 2, The first colored material includes at least one selected from the group consisting of CoO, FeO, Fe ₂ O ₃ , CuO, FeO, VO ₂ and NiO. The method of claim 1, The front substrate and the partition wall each include a first coloring material and a second coloring material, The first colored material and the second colored material are Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Ru, Pt, U, Nd, Er, Pr, Ce, Sm, Eu, Tb, A plasma display panel comprising at least one selected from the group consisting of Dy, Ho, Tm, Ag, and Cd. The method of claim 1, And the first color and the second color are complementary to each other. The method of claim 1, And a plasma display panel partially colored only on an upper surface of the partition wall seen from the front. The method of claim 1, And said barrier rib is colored entirely. The method of claim 1, And the front substrate has a transmittance of 60% or less of light having a wavelength of 800 to 1200 nm. The method of claim 1, The partition wall is a plasma display panel. The method of claim 1, Sustain electrode pairs causing discharge in the discharge cells; Address electrodes extending to intersect the sustain electrode pairs; A front dielectric layer and a back dielectric layer covering the sustain electrode pairs and the address electrodes, respectively; Phosphor layers disposed in the discharge cells; And And a discharge gas filled in the discharge cells. Visible light can pass through, the front substrate is colored in a first color; A rear substrate disposed to face the front substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning a plurality of discharge cells and colored in a second color; And the first and second color schemes are subtracted and mixed with each other. The method of claim 11, The front substrate includes a first colored material for selectively absorbing light having a wavelength of 800 to 1200nm. The method of claim 12, The first colored material includes at least one selected from the group consisting of CoO, FeO, Fe ₂ O ₃ , CuO, FeO, VO ₂ and NiO. The method of claim 11, The front substrate and the partition wall each include a first coloring material and a second coloring material, The first colored material and the second colored material are Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Ru, Pt, U, Nd, Er, Pr, Ce, Sm, Eu, Tb, A plasma display panel comprising at least one selected from the group consisting of Dy, Ho, Tm, Ag, and Cd. The method of claim 11, And the first and second color schemes are complementary to each other. The method of claim 11, And a plasma display panel partially colored only on an upper surface of the partition wall seen from the front. The method of claim 11, And said barrier rib is colored entirely. The method of claim 11, And the front substrate has a transmittance of 60% or less of light having a wavelength of 800 to 1200 nm. The method of claim 11, The partition wall is a plasma display panel. The method of claim 11, Sustain electrode pairs causing discharge in the discharge cells; Address electrodes extending to intersect the sustain electrode pairs; A front dielectric layer and a back dielectric layer covering the sustain electrode pairs and the address electrodes, respectively; Phosphor layers disposed in the discharge cells; And And a discharge gas filled in the discharge cells.

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