KR100670384B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve largely expression of gray levels by using two sub-pixels for emitting green visible rays. A second substrate(120) is arranged in parallel to a first substrate(110). A first discharge electrode(131) is formed between the first and second substrates. A second discharge electrode(132) is formed between the first and second substrates. A barrier rib(140) is disposed between the first and second substrates in order to define sub-pixels(191a,192a,193a,194a) for forming pixels. The discharge cells are filled with discharge gas. One pixel is formed with four sub-pixels(191,192,193,194).

Description

Plasma display panel {Plasma display panel}

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

FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 110: first substrate

120: second substrate 131: first discharge electrode

132: second discharge electrode 133: bus electrode

140: partition wall 150: phosphor layer

151: red phosphor layer 152: green phosphor layer

153: blue phosphor layer 161: first dielectric layer

162: second dielectric layer 170: protective layer

180: address electrode 190: pixel

191, 192, 193, and 194: subpixels 191a, 192a, 193a, and 194a: discharge cells

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving color reproducibility.

Recently, a plasma display panel (PDP), which is drawing attention as a replacement for a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. The phosphor formed in a predetermined pattern is excited by the ultraviolet rays generated thereby to obtain a desired image.

In such a conventional plasma display panel, a phosphor that generates red, green, and blue visible light is disposed at each subpixel that implements a pixel, and then a plasma gas discharge is generated to emit red, green, and blue visible light from the phosphor. In addition, the desired color was realized by adding and synthesizing the primary colors of red, green, and blue emitted in this way. That is, in the conventional plasma display panel, one subpixel which generates red, green, and blue colors is combined to form one pixel, thereby realizing a desired color.

By the way, since the phosphor which generates green visible light of the conventional plasma display panel generally has luminance saturation characteristics, it has a characteristic of generating visible light having a lower luminance than that of other colored phosphors, and thus the overall linearity of the expression of gray scale It is difficult to implement, there is a problem that the color reproducibility of the plasma display panel is bad.

The main object of the present invention is to provide a plasma display panel which can improve color reproducibility.

The present invention provides a substrate comprising: a first substrate, a second substrate arranged in parallel with the first substrate, a first discharge electrode formed between the first substrate and the second substrate, the first substrate, and the second substrate. A second discharge electrode formed between the substrates, a partition wall disposed between the first substrate and the second substrate and defining a discharge cell of subpixels forming a pixel, and a discharge gas in the discharge cell; One pixel includes one subpixel in which a phosphor layer emitting red visible light is arranged, one subpixel in which a phosphor layer emitting blue visible light is arranged and at least two in which a phosphor layer emitting green visible light is arranged. A plasma display panel including two subpixels is provided.

The first substrate may be formed to transmit visible light.

Here, the first discharge electrode may extend in one direction, and the second discharge electrode may extend to cross the first discharge electrode.

The first discharge electrode and the second discharge electrode may be disposed in parallel to each other, and further include address electrodes to intersect the first discharge electrode and the second discharge electrode.

The address electrode may be disposed on the second substrate.

The first dielectric layer may be disposed on the second substrate to cover the address electrode.

The first discharge electrode and the second discharge electrode may be disposed on the first substrate, and the second dielectric layer may be disposed on the first substrate to cover the first discharge electrode and the second discharge electrode.

The first discharge electrode and the second discharge electrode may include ITO.

Here, at least part of the second dielectric layer may be covered by a protective layer.

Here, the protective layer may include magnesium oxide (MgO).

Here, a discharge cell of a subpixel in which the phosphor layer emitting green visible light is disposed, and a discharge cell of a subpixel in which the phosphor layer emitting red visible light is disposed and a phosphor layer emitting blue visible light are disposed. The volume may be smaller than the discharge cells of the subpixels.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 1 below.

<Formula 1>

Zn _2-x Mn _x SiO ₄

In Chemical Formula 1, 0.1 ≦ x ≦ 0.5.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 2 below.

<Formula 2>

(Zn, A) ₂ SiO ₄ : Mn

In Formula 2, A is an alkaline earth metal.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 3 below.

<Formula 3>

(BaSrMg) O.aAl ₂ O ₃ : Mn

In Chemical Formula 3, 1 ≦ a ≦ 23.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 4 below.

<Formula 4>

BaMgAl _b O _c : Mn

In Formula 4, 1 ≦ b ≦ 23 and 1 ≦ c ≦ 23.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 5 below.

<Formula 5>

LaMgAl _d O _e : Tb

In Formula 5, 1 ≦ d ≦ 14 and 8 ≦ e ≦ 47.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 6 below.

<Formula 6>

ReBO ₃ : Tb

In Formula 6, Re is at least one rare earth selected from the group consisting of Sc, Y, La, Ce and Gd.

Here, the phosphor layer emitting green visible light may include a phosphor having Formula 7 below.

<Formula 7>

MgAl _g O _h : Mn

In Formula 7, 1 ≦ g ≦ 10 and 1 ≦ h ≦ 30.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

1 is a schematic partial cutaway perspective view illustrating a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.

1 and 2, the plasma display panel 100 according to the embodiment of the present invention may include a first substrate 110, a second substrate 120, a first discharge electrode 131, and a second discharge. An electrode 132, a partition wall 140, a phosphor layer 150, a first dielectric layer 161, a second dielectric layer 162, and an address electrode 180 are included.

The first substrate 110 and the second substrate 120 are spaced apart from each other at a predetermined interval and are disposed to face each other. The first substrate 110 is made of transparent glass, so that visible light can be transmitted.

In the present embodiment, since the first substrate 110 is transparent, visible light generated by the discharge passes through the first substrate 110, but the present invention is not limited thereto. That is, while the first substrate of the present invention is opaque, the second substrate may be configured to be transparent, and the first substrate and the second substrate may be configured to be transparent at the same time. In addition, the first substrate and the second substrate of the present invention may be made of a semi-transparent material, it may be configured by embedding a color filter on the surface or inside.

The first discharge electrode 131, the second discharge electrode 132, and the bus electrode 133 having a stripe shape are formed on the rear surface of the first substrate 110.

One of the first discharge electrode 131 and the second discharge electrode 132 functions as a scan electrode and the other function as a common electrode, and is composed of a transparent electrode made of indium tin oxide (ITO). .

The bus electrode 133 is provided on the lower surfaces of the first discharge electrode 131 and the second discharge electrode 132, and is electrically conductive to reduce the line resistance of the first discharge electrode 131 and the second discharge electrode 132. It is made of a large metal material and is formed in a narrow width.

The first discharge electrode 131 and the second discharge electrode 132 of the present embodiment are made of ITO, but the present invention is not limited thereto. That is, the first discharge electrode and the second discharge electrode of the present invention may be made of silver (Ag), copper (Cu), aluminum (Al) and the like of an opaque material. In this case, however, in order to increase the transmittance of visible light, it is preferable to divide the first discharge electrode and the second discharge electrode into several narrow strands, and arrange the light to be transmitted therebetween.

In the present embodiment, the first discharge electrode 131 and the second discharge electrode 132 are disposed on the rear surface of the first substrate 110, but are not limited thereto. That is, the first discharge electrode and the second discharge electrode of the present invention may be spaced apart from the first substrate at a predetermined interval. In addition, the first discharge electrode and the second discharge electrode of the present invention may be disposed embedded in the partition wall, in which case, the first discharge electrode and the second discharge electrode is a circular ring shape, a ladder shape, a ring partly opened It may be formed in a shape or the like and configured to surround at least a part of the discharge space.

The second dielectric layer 162 is disposed on the first substrate 110 to cover the first discharge electrode 131, the second discharge electrode 132, and the bus electrode 133.

The second dielectric layer 162 prevents the first discharge electrode 131 and the second discharge electrode 132 from directly conducting electricity during sustain discharge, and charged particles are discharged from the first discharge electrode 131 and the second discharge electrode 132. It is possible to prevent damage by directly colliding with and to induce charged particles to accumulate wall charges. As such dielectrics, PbO, B ₂ O ₃ , SiO _2, and the like are used.

A protective layer 170 is formed on the lower surface of the second dielectric layer 162, and the protective layer 170 is made of magnesium oxide (MgO).

The protective layer 170 prevents the first discharge electrode 131 and the second discharge electrode 132 from being damaged by the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons. do.

Meanwhile, an address electrode 180 is formed on the second substrate 120.

The address electrode 180 performs an address discharge together with a discharge electrode serving as a scan electrode among the first discharge electrode 131 and the second discharge electrode 132.

The first dielectric layer 161 is formed on the address electrode 180. The first dielectric layer 161 functions to protect the address electrodes 180 from discharge, and the material is formed of the second dielectric layer 162 described above. The same can be formed.

On the other hand, although the address electrode 180 is disposed on the second substrate 120 of the present embodiment, the address operation is performed, but the present invention is not limited thereto. That is, according to the present invention, the first discharge electrode and the second discharge electrode can be driven only without an additional address electrode. In this case, the first discharge electrode and the second discharge electrode are disposed to intersect with each other. Even the second discharge electrode alone can perform an addressing action for determining where the discharge will occur.

The partition wall 140 is formed on the first dielectric layer 161. The partition wall 140 maintains a discharge distance and prevents electro-optic crosstalk between partitioned discharge spaces.

The partition wall 140 partitions the discharge space together with the first discharge electrode 131, the second discharge electrode 132, and the address electrode 180, and forms a subpixel constituting one pixel 190. sub-pixel) 191, 192, 193, 194 to perform the function of arranging.

Four subpixels 191, 192, 193, and 194 form a single pixel 190. Each subpixel 191, 192, 193, and 194 is arranged in a line. It is composed of discharge cells 191a, 192a, 193a, and 194a.

The subpixels 191, 192, 193, and 194 according to the present exemplary embodiment are configured of discharge cells 191a, 192a, 193a, and 194a arranged in a line, respectively, but the present invention is not limited thereto. Do not. That is, the arrangement of the discharge cells constituting the subpixels according to the present invention is not necessarily arranged in a line, but may be arranged to form a 2 × 2 matrix.

In addition, as shown in FIG. 1, in the embodiment of the present invention, the cross-sections of the respective discharge cells 191a, 192a, 193a, and 194a of the subpixels 191, 192, 193, and 194. Although the shape of the square is, the present invention is not limited thereto. That is, the cross-sectional shape of each discharge cell according to the present invention may be a polygon, such as a triangle, a pentagon, or various shapes such as a circle or an oval, and the partitions are formed in a stripe pattern, respectively. May have an open shape.

On the other hand, the phosphor layer 150 has a component of a photoluminescence phosphor that generates visible light by receiving ultraviolet rays, red phosphor layer 151, green phosphor layer 152, respectively for each color of the visible light emitted; It is made of a blue phosphor layer 153.

Here, the red phosphor layer 151 is disposed on the subpixel 191, the green phosphor layer 152 is disposed on the subpixel 192 and the subpixel 193, and the blue phosphor layer 153 is It is disposed in the subpixel 194. That is, the red phosphor layer 151 and the blue phosphor layer 153 are disposed in one subpixel 191 and 194, respectively, whereas the green phosphor layer 152 has two subpixels 192 ( 193).

According to the present exemplary embodiment, four subpixels 191, 192, 193, and 194 forming one pixel 190 are formed, and green phosphor layer 152 is disposed on two subpixels. However, the present invention is not limited thereto. That is, according to the present invention, the green phosphor layer may be disposed in two or more subpixels, thereby increasing the number of subpixels forming one pixel.

Here, the red phosphor layer 151 is formed by applying a phosphor of a material such as Y (V, P) O ₄ : Eu, and the blue phosphor layer 153 is a phosphor of a material such as BaMgAl ₁₀ O ₁₇ : Eu. Is applied and formed.

The red phosphor layer 151 according to the present embodiment is formed by applying a phosphor of a material such as Y (V, P) O ₄ : Eu, and the blue phosphor layer 153 is formed of BaMgAl ₁₀ O ₁₇ : Eu or the like. Although the phosphor of a raw material is apply | coated and formed, this invention is not limited to this. That is, the type of phosphor used for the red and blue phosphor layers according to the present invention is not particularly limited, and the red and blue phosphor layers newly developed as well as the red and blue phosphor layers used in the prior art may be applied. .

The phosphor constituting the green phosphor layer 152 is formed including the compound of Formula 1 below.

<Formula 1>

Zn _2-x Mn _x SiO ₄

In the formula (1), 0.1≤x≤0.5.

The phosphor of the green phosphor layer 152 according to the present embodiment is formed including the compound of Formula 1, but the present invention is not limited thereto. That is, the type of phosphor used for the green phosphor layer according to the present invention is not particularly limited, and a green phosphor layer newly developed as well as a green phosphor layer used in the related art may be applied. For example, the phosphor of the green phosphor layer according to the present invention may include any one of the following compounds of the formulas (2) to (7), and mix at least two or more of the compounds of the formulas (1) to (7). It can also be done.

Further, in the subpixel 192 and the subpixel 193 of the present embodiment, both green phosphor layers 152 made of phosphors having the same composition are disposed, but the present invention is not limited thereto. That is, in the phosphor of the green phosphor layer according to the present invention, phosphors having different compositions may be disposed in the subpixels 192 and the subpixels 193, respectively.

Hereinafter, as examples of the phosphors of the green phosphor layer that can be applied to the present invention, the compounds of Formulas 2 to 7 are as follows.

<Formula 2>

(Zn, A) ₂ SiO ₄ : Mn

In Formula 2, A is an alkaline earth metal such as Mg, Ca, and Ba.

<Formula 3>

(BaSrMg) O.aAl ₂ O ₃ : Mn

In Chemical Formula 3, 1 ≦ a ≦ 23.

<Formula 4>

BaMgAl _b O _c : Mn

In Formula 4, 1 ≦ b ≦ 23 and 1 ≦ c ≦ 23.

<Formula 5>

LaMgAl _d O _e : Tb

In Formula 5, 1 ≦ d ≦ 14 and 8 ≦ e ≦ 47.

<Formula 6>

ReBO ₃ : Tb

In Formula 6, Re is at least one rare earth selected from the group consisting of Sc, Y, La, Ce, and Gd. For example, Chemical Formula 6 may be YBO ₃ : Tb, YScBO ₃ : Tb, or the like.

<Formula 7>

MgAl _g O _h : Mn

In Formula 7, 1 ≦ g ≦ 10 and 1 ≦ h ≦ 30.

Meanwhile, according to the present exemplary embodiment, the red phosphor layer 151 is disposed on the subpixel 191, and the green phosphor layer 152 is disposed on the subpixel 192 and the subpixel 193. The phosphor layer 153 is disposed on the subpixel 194, but the present invention is not limited thereto. That is, according to the present invention, the green phosphor layer may be disposed in two subpixels arbitrarily selected from four subpixels.

In addition, in the embodiment of the present invention, the volume of each of the discharge cells 191a, 192a, 193a, and 194a constituting the subpixels 191, 192, 193, and 194 are all the same. The invention is not limited to this. That is, according to the present invention, the volume of the discharge cells 192a and 193a constituting the subpixel 192 and the subpixel 193 in which the green phosphor layer 152 is disposed is the remaining discharge cells 191a and 194a. It may be smaller than the volume of. This is to compensate for the luminance by appropriately adjusting the amount of green visible light emitted.

Meanwhile, the first discharge electrode 131, the second discharge electrode 132, the partition wall 140, the phosphor layer 150, and the first dielectric layer 161 are disposed between the first substrate 110 and the second substrate 120. After the second dielectric layer 162 and the address electrode 180 are formed, the first substrate 110 and the second substrate 120 are sealed using frit or the like.

After the first substrate 110 and the second substrate 120 are sealed, the space inside the assembled plasma display panel 100 is filled with air, thereby completely removing the air in the assembled plasma display panel 100. By exhausting, air is replaced with an appropriate discharge gas capable of increasing the efficiency of discharge.

As the discharge gas, a mixed gas such as Ne-Xe, He-Xe, He-Ne-Xe, or the like including xenon (Xe) may be used.

An exemplary discharge process and color reproduction process of the plasma display panel 100 according to the embodiment of the present invention configured as described above will be described below.

First, when a predetermined address voltage is applied between the discharge electrode serving as the scan electrode of the first discharge electrode 131 and the second discharge electrode 132 and the address electrode 180 from an external power source, an address discharge occurs. As a result of this address discharge, a discharge cell in which sustain discharge is to be generated is selected. After that, when a discharge holding voltage is applied between the first discharge electrode 131 and the second discharge electrode 132 of the selected discharge cell, the discharge discharge voltage is applied to the vicinity of the first discharge electrode 131 and the second discharge electrode 132. The movement of the accumulated wall charges causes a sustain discharge, and ultraviolet rays are emitted as the energy level of the discharged gas excited during the sustain discharge decreases.

The emitted ultraviolet rays excite the phosphor of the phosphor layer 150. As the energy level of the excited phosphor is lowered, visible light of red, green, and blue is emitted. At this time, the plasma display panel 100 according to the present embodiment discharges to any one of the subpixels 192 and 193 when the low grayscale image is implemented in the process of emitting green visible light. In order to implement green visible light, and to implement a high gradation image, discharge is caused to the subpixels of both the subpixel 192 and the subpixel 193 to implement green visible light.

That is, since the plasma display panel 100 of the present exemplary embodiment has two subpixels 192 and 193 to realize green visible light, only one of the subpixels is driven in the case of low gradation and high gradation In this case, it is possible to increase the gray scale expression power by driving both subpixels. In this case, since fine gray scales can be expressed according to the degree of gray scales required, gray scale linearity can be improved as a whole and brightness can be improved.

On the other hand, as shown above, when the red, green, and blue visible light is emitted from each of the sub-pixels 191, 192, 193, 194, the visible light is emitted by projecting the first substrate 110, and Visible light of the same three colors is additively synthesized to form the color of one pixel 190.

As described above, since the plasma display panel 100 of the present embodiment is composed of two sub-pixels emitting green visible light, detailed gray scales can be expressed, and thus, gray scale linearity is superior to conventional plasma display panels. . In this case, the plasma display panel 100 of the present embodiment not only improves the color reproducibility as a whole, but also has the advantage that the luminance of the image to be implemented is improved.

In particular, the plasma display panel 100 according to the present embodiment uses two subpixels 192 and 193 to implement green visible light in the case of synthesizing white light by adding red, green, and blue visible light. Therefore, since the luminance saturation characteristic is improved to improve gray scale linearity and gray scale expressing power of the white light, color reproduction of the plasma display panel 100 can be improved as a whole.

Since the plasma display panel according to the present invention has two sub-pixels emitting green visible light, fine gray scales can be expressed, and thus the gray scale linearity is improved and color reproduction is excellent overall. have.

In addition, since the plasma display panel of the present invention is composed of two subpixels emitting green visible light, the overall brightness is increased, and the gray scale display power of the white light 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 (18)

A first substrate; A second substrate arranged in parallel with the first substrate; A first discharge electrode formed between the first substrate and the second substrate; A second discharge electrode formed between the first substrate and the second substrate; Barrier ribs disposed between the first substrate and the second substrate and defining discharge cells of subpixels forming pixels; And A discharge gas in the discharge cell; One pixel includes at least one subpixel having a phosphor layer emitting red visible light, one subpixel having a phosphor layer emitting blue visible light, and at least a phosphor layer emitting green visible light. A plasma display panel comprising two subpixels. The method of claim 1, And the first substrate is formed to transmit visible light. The method of claim 1, And the first discharge electrode extends in one direction and the second discharge electrode extends to intersect the first discharge electrode. The method of claim 1, And the first discharge electrode and the second discharge electrode are disposed in parallel and further include address electrodes to intersect the first discharge electrode and the second discharge electrode. The method of claim 4, wherein And the address electrode is disposed on the second substrate. The method of claim 5, And a first dielectric layer disposed on the second substrate to cover the address electrode. The method of claim 1, Wherein the first discharge electrode and the second discharge electrode are disposed on the first substrate, and a second dielectric layer is disposed on the first substrate to cover the first discharge electrode and the second discharge electrode. The method of claim 7, wherein And the first discharge electrode and the second discharge electrode comprise ITO. The method of claim 7, wherein At least a portion of the second dielectric layer is covered by a protective layer. The method of claim 9, The protective layer includes magnesium oxide (MgO). The method of claim 1, The discharge cell of the subpixel in which the phosphor layer emitting green visible light is arranged is a subcell in which the discharge cell of the subpixel in which the phosphor layer emitting red visible light is disposed and the phosphor layer emitting the blue visible light are arranged. A plasma display panel whose volume is smaller than that of a discharge cell of a pixel. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having Formula 1 below. <Formula 1> Zn _2-x Mn _x SiO ₄ In Chemical Formula 1, 0.1 ≦ x ≦ 0.5. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having Formula 2 below. <Formula 2> (Zn, A) ₂ SiO ₄ : Mn In Formula 2, A is an alkaline earth metal. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having the following Chemical Formula 3. <Formula 3> (BaSrMg) O.aAl ₂ O ₃ : Mn In Chemical Formula 3, 1 ≦ a ≦ 23. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having the following Chemical Formula 4. <Formula 4> BaMgAl _b O _c : Mn In Formula 4, 1 ≦ b ≦ 23 and 1 ≦ c ≦ 23. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having Formula 5 below. <Formula 5> LaMgAl _d O _e : Tb In Formula 5, 1 ≦ d ≦ 14 and 8 ≦ e ≦ 47. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having the following Chemical Formula 6. <Formula 6> ReBO ₃ : Tb In Formula 6, Re is at least one rare earth selected from the group consisting of Sc, Y, La, Ce, and Gd. The method of claim 1, The phosphor layer emitting green visible light includes a phosphor having the following Chemical Formula 7. <Formula 7> MgAl _g O _h : Mn In Formula 7, 1 ≦ g ≦ 10 and 1 ≦ h ≦ 30.

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