KR100862568B1 - Plasma Display Panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, wherein a black layer is disposed between a substrate and an electrode with a black material including black particles having a diameter of 1 μm (micrometer) or more and 4 μm (micrometer) or less. As a result, the number of manufacturing steps and the manufacturing time of the black layer can be reduced, thereby reducing the manufacturing cost, and also preventing the discoloration of the electrode or the substrate, thereby suppressing the decrease in driving efficiency.

Such a plasma display panel according to an embodiment of the present invention includes a substrate, a black layer formed on the substrate, and an electrode formed on the black layer, and the black layer has a diameter of 1 μm (micrometer) or more and 4 μm (micro) And black particles less than or equal to a meter).

In addition, the black material for manufacturing a video display panel according to an embodiment of the present invention includes black particles having a diameter of 1 μm (micrometer) or more and 4 μm (micrometer) or less.

Description

Plasma Display Panel

1 is a view for explaining an example of the structure of a plasma display panel according to an embodiment of the present invention.

2 is a diagram for explaining the black layer in more detail.

3 is a view for explaining an example of a method for forming a black layer.

4A to 4B are views for explaining the effect of the application of the black layer in the single layer electrode structure.

5A to 5B are views for explaining an example of the structure of the first electrode and the second electrode of the plasma display panel according to the embodiment of the present invention;

FIG. 6 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an embodiment of the present invention. FIG.

7 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention;

8A to 8B are diagrams for explaining another form of the rising ramp signal or the second falling ramp signal.

9 is a diagram for explaining another type of a sustain signal.

<Explanation of symbols for the main parts of the drawings>

101: front substrate 102: first electrode

103: second electrode 104: upper dielectric layer

105: protective layer 111: back substrate

112, 112a, 112b: partition 113: third electrode

114: phosphor layer 115: lower dielectric layer

The present invention relates to a plasma display panel.

In general, a phosphor layer is formed in a discharge cell (Cell) partitioned by a partition, and a plurality of electrodes are formed in the plasma display panel.

The driving signal is supplied to the discharge cell through the electrode.

Then, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

One embodiment of the present invention is to provide a plasma display panel which suppresses discoloration of an electrode or a substrate by improving a material of a black layer formed between the electrode and the substrate.

Plasma display panel according to an embodiment of the present invention for achieving the above object comprises a substrate, a black layer formed on the substrate and an electrode formed on the black layer, the black layer has a diameter of 1㎛ (micrometer) or more Black particles less than or equal to 4 μm.

In addition, the thickness of a black layer is 2 micrometers (micrometer) or more.

In addition, the thickness of a black layer is 2 micrometers (micrometer) or more and 8 micrometers (micrometer) or less.

In addition, the black layer is thicker than the electrode.

In addition, the black particles include at least one of cobalt (Co) material or ruthenium (Ru) material.

In addition, the diameter of a black particle is 1.5 micrometers (micrometer) or more and 3 micrometers (micrometer) or less.

In addition, the electrode is a single layer.

In addition, the electrode includes a silver (Ag) material.

In addition, the color of the electrode is darker than the color of the substrate.

In addition, the substrate has a content of sodium oxide (Na ₂ O) of 10 wt% or more.

The black material for manufacturing an image display panel according to an embodiment of the present invention for achieving the above object includes black particles having a diameter of 1 μm (micrometer) or more and 4 μm (micrometer) or less.

In addition, the black particles include at least one of cobalt (Co) material or ruthenium (Ru) material.

In addition, the diameter of a black particle is 1.5 micrometers (micrometer) or more and 3 micrometers (micrometer) or less.

Hereinafter, a plasma display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining an example of the structure of a plasma display panel according to an embodiment of the present invention.

Referring to FIG. 1, a plasma display panel according to an exemplary embodiment of the present invention may include a front substrate 101 on which first electrodes 102 and Y and second electrodes 103 and Z are parallel to each other, and the first substrate described above. The rear substrate 111 formed with the third electrodes 113 and X crossing the electrodes 102 and Y and the second electrodes 103 and Z may be bonded to each other. Here, the front substrate 101 is a glass substrate including a glass material, between the first electrode (102, Y) and the front substrate 101, and the second electrode (103, Z) and the front substrate 101 A black layer (not shown) is formed between the layers. This will be described later in more detail.

The electrodes formed on the front substrate 101, for example, the first electrodes 102 and Y and the second electrodes 103 and Z, generate a discharge in a discharge space, that is, a discharge cell, and discharge the discharge of the discharge cell. I can keep it.

The dielectric layer covers the first electrode 102 and the second electrode 103 and Z on the front substrate 101 on which the first electrode 102 and the second electrode 103 and Z are formed. For example, upper dielectric layer 104 may be formed.

This upper dielectric layer 104 limits the discharge current of the first electrode 102, Y and the second electrode 103, Z and between the first electrode 102, Y and the second electrode 103, Z. Can be insulated.

A protective layer 105 may be formed on the upper surface of the upper dielectric layer 104 to facilitate a discharge condition. The protective layer 105 may be formed through a method of depositing a material such as magnesium oxide (MgO) on the upper dielectric layer 104.

Meanwhile, electrodes, for example, third electrodes 113 and X are formed on the rear substrate 111, and third electrodes 113 and X are formed on the rear substrate 111 on which the third electrodes 113 and X are formed. A dielectric layer, such as lower dielectric layer 115, may be formed to cover the gap.

The lower dielectric layer 115 may insulate the third electrodes 113 and X.

On top of the lower dielectric layer 115, a discharge space, that is, a partition wall 112 such as a stripe type, a well type, a delta type, and a honeycomb type for partitioning the discharge cells is formed. Can be formed. Accordingly, discharge cells such as red (R), green (G), and blue (B) may be formed between the front substrate 101 and the rear substrate 111.

In addition to the red (R), green (G), and blue (B) discharge cells, it is also possible to further form a white (W) or yellow (Yellow: Y) discharge cell.

Meanwhile, although the pitches of the red (R), green (G), and blue (B) discharge cells in the plasma display panel according to an embodiment of the present invention may be substantially the same, red (R) and green The pitches of the red (R), green (G) and blue (B) discharge cells may be varied to match the color temperature in the (G) and blue (B) discharge cells.

In this case, the pitch may be different for each of the red (R), green (G), and blue (B) discharge cells, but the pitch of one or more discharge cells among the red (R), green (G), and blue (B) discharge cells. May be different from the pitch of other discharge cells. For example, the pitch of the red (R) discharge cells is the smallest, and the pitch of the green (G) and blue (B) discharge cells may be larger than the pitch of the red (R) discharge cells.

Here, the pitch of the green (G) discharge cells may be substantially the same as or different from the pitch of the blue (B) discharge cells.

In addition, the plasma display panel according to the exemplary embodiment of the present invention may have not only the structure of the partition wall 112 shown in FIG. 1 but also the structure of the partition wall having various shapes. For example, the partition wall 112 includes a first partition wall 112b and a second partition wall 112a, where the height of the first partition wall 112b and the height of the second partition wall 112a are different from each other. At least one of the first partition wall 112b or the second partition wall 112a, and a channel type partition wall structure having a channel usable as an exhaust passage, at least one of the first partition wall 112b and the second partition wall 112a. Grooved partition wall structure having a groove formed in the groove will be possible.

Here, in the case of the differential partition wall structure, the height of the first partition wall 112b among the first partition wall 112b or the second partition wall 112a may be lower than the height of the second partition wall 112a. In addition, in the case of a channel-type partition wall structure or a groove-type partition wall structure, a channel may be formed or a groove may be formed in the first partition wall 112b.

On the other hand, in the plasma display panel according to an embodiment of the present invention, although the red (R), green (G), and blue (B) discharge cells are shown and described as being arranged on the same line, they may be arranged in different shapes. It will be possible. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may also be a variety of polygonal shapes, such as pentagonal, hexagonal, as well as rectangular.

In addition, in FIG. 1, only the case where the partition wall 112 is formed on the rear substrate 111 is illustrated, but the partition wall 112 may be formed on at least one of the front substrate 101 and the rear substrate 111.

Here, a predetermined discharge gas may be filled in the discharge cell partitioned by the partition wall 112.

In addition, a phosphor layer 114 for emitting visible light for image display may be formed in a discharge cell partitioned by the partition wall 112. For example, red (R), green (G), and blue (B) phosphor layers may be formed.

In addition to the red (R), green (G), and blue (B) phosphors, it is also possible to further form a white (W) and / or yellow (Y) phosphor layer.

In addition, the phosphor layers 114 of the red (R), green (G), and blue (B) discharge cells may have substantially the same thickness or may differ from one or more. For example, when the thickness of the phosphor layer 114 in at least one of the red (R), green (G), and blue (B) discharge cells is different from the other discharge cells, green (G) or The thickness of the phosphor layer 114 in the blue (B) discharge cell may be thicker than the thickness of the phosphor layer 114 in the red (R) discharge cell. Here, the thickness of the phosphor layer 114 in the green (G) discharge cell may be substantially the same as or different from the thickness of the phosphor layer 114 in the blue (B) discharge cell.

In the above description, only one example of the plasma display panel according to an exemplary embodiment of the present invention is illustrated and described. However, the present invention is not limited to the plasma display panel having the above-described structure. For example, the description hereinabove illustrates only the case where the top dielectric layer number 104 and the bottom dielectric layer number 115 are each one layer, but one or more of these top dielectric layers and bottom dielectric layers may be a plurality of layers. It can also be layered.

In addition, another black layer (not shown) may be further formed on the upper part of the partition wall 112 to prevent reflection of the external light due to the partition wall number 112.

In addition, another black layer (not shown) may be further formed at a specific position on the front substrate 101 corresponding to the partition wall 112.

In addition, the width or thickness of the third electrode 113 formed on the rear substrate 111 may be substantially constant, but the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. will be. For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

As such, the structure of the plasma display panel according to the exemplary embodiment may be variously changed.

Next, FIG. 2 is a diagram for explaining the black layer in more detail.

Referring to FIG. 2, black layers 200a and 200b are formed on the front substrate 101 and a first electrode 102 or a second electrode 103 is formed on the black layers 200a and 200b. Can be.

The black layers 200a and 200b include black particles having a diameter of 1 μm (micrometer) or more and 4 μm (micrometer) or less. Alternatively, the black layers 200a and 200b may include black particles having a diameter of 1.5 μm (micrometer) or more and 3 μm (micrometer) or less. Here, the black particles may include at least one of cobalt (Co) material or ruthenium (Ru) material.

This color of the black layers 200a and 200b is darker than the color of the first electrode 102 and the second electrode 103. Accordingly, the black layers 200a and 200b may absorb light incident from the outside to prevent generation of reflected light.

An example of the method of forming the black layers 200a and 200b will be described with reference to FIG. 3.

3 is a view for explaining an example of a method of forming a black layer.

Referring to FIG. 3, first, a front substrate 101 is prepared as shown in (a), and a black material in a paste state or slurry state is coated on the front substrate 101 as shown in (b). Material layers 300a and 300b may be formed. Here, the black material in the paste state or the slurry state forming the black material layers 300a and 300b may include about 60% or more and 90% or less of the black particles 310. Alternatively, the black material in the paste state or the slurry state may include about 70% or more and 80% or less of the black particles 310. In addition, the black material may include a material such as a solvent such as a solvent and the like.

Subsequently, when the drying or firing process is performed, a material such as a solvent evaporates, and thus black layers 200a and 200b are formed.

Next, as in step (c), the first electrode 102 or the second electrode 103 may be formed on the black layers 200a and 200b.

Here, when the diameter of the black particles 310 is less than 1 μm (micrometer), the number of steps of applying the black material for forming the black material layers 300a and 300b to the front substrate 101 as shown in (b) is as follows. Can increase. In more detail, when the diameter of the black particles 310 is less than 1 μm (micrometer), the diameter of the black particles 310 is relatively small, so that the thickness of the black material layers 300a and 300b may be sufficiently thick. Three black material application processes should be performed.

In addition, when the diameter of the black particles 310 is excessively large, the process of forming the black material layers 300a and 300b becomes difficult, or it is difficult to precisely control the thickness of the black material layers 300a and 300b.

On the other hand, when the diameter of the black particles 310 is 1 ㎛ (micrometer) or more than 4 ㎛ (micrometer) as in one embodiment of the present invention, the black material layer 300a, 300b) can be formed to a sufficient thickness. Thereby, the process time which a manufacturing process requires can be reduced. In addition, the forming process of the black material layers 300a and 300b is facilitated, and the thickness of the black material layers 300a and 300b can be precisely controlled.

In addition, when the diameter of the black particles 310 is less than 1 μm (micrometer), the black material in the process of applying the black material for forming the black material layers 300a and 300b to the front substrate 101 as shown in (b) Bubbles or the like may occur in the material layers 300a and 300b to increase the possibility of a defect.

On the other hand, when the diameter of the black particles 310 is 1 μm (micrometer) or more and 4 μm (micrometer) or less as in the exemplary embodiment of the present invention, bubbles or the like occur in the black material layers 300a and 300b. By suppressing, the possibility of a defect can be reduced.

The thickness t1 of the black layers 200a and 200b formed in the same manner as described above is 2 μm (micrometer) or more as shown in FIG. 2. Alternatively, the thickness t1 of the black layers 200a and 200b is greater than the thickness t2 of the first electrode 102 or the second electrode 103.

Such a black layer 200a, 200b has a sufficient thickness of at least 2 μm (micrometers) or has a thickness larger than the thickness t2 of the first electrode 102 or the second electrode 103, thereby Preventing direct contact between the substrate 101 and the first electrode 102 or the second electrode 103, and the electrode materials of the first electrode 102 or the second electrode 103 to the front substrate 101. By preventing penetration, discoloration of the predetermined region or the first electrode 102 and the second electrode 103 of the front substrate 101 can be prevented.

Alternatively, in order to prevent the structural stability of the plasma display panel from deteriorating, it is also possible to set the thickness t1 of the black layers 200a and 200b to 2 μm (micrometer) or more and 8 μm (micrometer) or less.

On the other hand, the black material described above is an image display panel other than the plasma display panel, such as a liquid crystal display (LCD), a field emission display (FED), an organic light emitting panel (Organic Light Emitting) It is also possible to apply to such fields as Diodes, OLED).

In the above description, only the method of applying the black material in the paste state or the slurry state to the substrate has been described, but it is also possible to form the black layer using the black material in the form of a sheet including at least one protective film. Do.

In addition, the first electrode 102 and the second electrode 103 may be a single layer.

Next, FIGS. 4A to 4B are views for explaining the effect of the application of the black layer in the single layer electrode structure.

First, referring to FIG. 4A, a case in which the first electrode 102 and the second electrode 103 include transparent electrodes 102a and 103a and bus electrodes 102b and 103b, respectively, is illustrated.

Here, black layers 400 and 410 may be formed between the transparent electrodes 102a and 103a and the bus electrodes 102b and 103b, respectively. The black layers of numbers 400 and 410 will be referred to as the first black layer. The transparent electrodes 102a and 103a may include a substantially transparent material such as indium tin oxide (ITO).

For example, assuming that the thicknesses of the first black layers 400 and 410 are t20 and that the thicknesses of the transparent electrodes 102a and 103a are t10, the thickness t20 of the first black layers 400 and 410 is two. When the thickness t20 of the black layers 400 and 410 is larger than the micrometer (micrometer) or the thickness t20 of the transparent electrodes 102a and 103a, the transparent electrodes 102a and 103a and the bus electrode 102b. , The electrical resistance is excessively increased between 103b, which may cause the electrical resistance of the first electrode 102 and the second electrode 103 to be excessively increased. This lowers the driving efficiency.

Also, in the structure of FIG. 3A, since the first black layers 400 and 410 and the transparent electrodes 102a and 103a are disposed together between the bus electrodes 102b and 103b and the front substrate 101, the first black layer ( The thickness of 400 and 410 need not be more than 2 탆 (micrometer).

Next, referring to FIG. 4B, a case in which the first electrode 102 and the second electrode 103 are a single layer (0ne Layer) is shown as in the embodiment of the present invention.

For example, the first electrode 102 and the second electrode 103 may be electrodes in which the transparent electrodes of numbers 102a and 103a are omitted in FIG. 3A.

At least one of the first electrode 102 and the second electrode 103 may include a substantially opaque electrically conductive metal material. For example, it may include a material having excellent electrical conductivity such as silver (Ag), copper (Cu), aluminum (Al), and the like, and a material having a lower cost than a transparent material such as indium tin oxide (ITO). .

In addition, at least one of the first electrode 102 or the second electrode 103 may be darker in color than the front substrate 101.

Here, as shown in FIG. 4B, when the first electrode 102 and the second electrode 103 are a single layer, the manufacturing process is simpler than in the case of FIG. 4A. For example, in the case of FIG. 4A, the bus electrodes 102b and 103b are formed again after the transparent electrodes 102a and 103a are formed in the process of forming the first electrode 102 and the second electrode 103. 4B is a single layer structure, it is possible to form the first electrode 102 and the second electrode 103 in one process.

In addition, as shown in FIG. 4B, when the first electrode 102 and the second electrode 103 are formed in a single layer, the manufacturing process is simplified and a relatively expensive transparent material such as indium-tin-oxide (ITO) is used. Since it does not need to use, manufacturing cost can be reduced.

In the case of FIG. 4B, black layers 200a and 200b may be formed between the first electrode 102 and the second electrode 103 and the front substrate 101, respectively. Such black layers of numbers 200a and 200b will be referred to as second black layers.

In the case of FIG. 4B, the transparent electrodes 102a and 103a are omitted between the first electrode 102 and the second electrode 103 and the front substrate 101 in comparison with the case of FIG. 4A. As a result, the thickness t1 of the second black layers 200a and 200b is less than 2 μm (micrometer), or the thickness t1 of the second black layers 200a and 200b is the first electrode 102 or the like. When it is thinner than the thickness t2 of the second electrode 103, the electrode material included in the first electrode 102 or the second electrode 103 passes through the second black layers 200a and 200b to pass through the front substrate. It becomes easy to reach 101. Therefore, the front substrate 101 or a part of the first electrode 102 and the second electrode 103 may be discolored. Then, the electrical resistance of the first electrode 102 and the second electrode 103 increases, which may lower the driving efficiency. Even the discoloration may be deepened and a part of the first electrode 102 or the second electrode 103 may be disconnected.

Accordingly, when the first electrode 102 and the second electrode 103 are a single layer, the second black layer 200a formed between the first electrode 102 and the second electrode 103 and the front substrate 101 may be formed. It may be more advantageous to make the thickness t1 of 200b) thicker than the thickness t2 of the first electrode 102 or the second electrode 103 or to be 2 μm (micrometer) or more.

In addition, when the front substrate 101 contains 10 wt% or more of sodium oxide (Na ₂ O), the thickness of the second black layers 200a and 200b may be 2 μm or more (micrometer) or the first electrode 102. Or thicker than the thickness of the second electrode 103 can be effective. This is as follows.

For example, when the front substrate 101 includes 10 wt% or more of sodium oxide (Na ₂ O), the density of the front substrate 101 may decrease. This is caused by the sodium (Na) material of sodium oxide. Then, the electrode material, for example, silver (Ag) particles included in the first electrode 102 or the second electrode 103 can more easily penetrate into the front substrate 101.

In addition, an electrode material included in the first electrode 102 or the second electrode 103, for example, silver (Ag), may easily react with sodium (Na).

Accordingly, when the front substrate 101 includes 10 wt% or more of sodium oxide (Na ₂ O), discoloration of the front substrate 101 or the first electrode 102 and the second electrode 103 may further occur. . For this reason, the agent formed between the front substrate 101 and the first electrode 102 and the second electrode 103 when the front substrate 101 contains 10 wt% or more of sodium oxide (Na ₂ O). It may be more effective to make the thickness of the two black layers 200a and 200b larger than the thickness of the first electrode 102 or the second electrode 103 or to be 2 μm (micrometer) or more.

Next, FIGS. 5A to 5B are views for explaining an example of the structure of the first electrode and the second electrode of the plasma display panel according to the exemplary embodiment of the present invention.

First, referring to FIG. 5A, the first electrode 540 and the second electrode 580 may include one or more line parts 530a, 530b, 570a, and 570b.

The line portions 530a, 530b, 570a, and 570b may be formed to intersect the third electrode 590 in a discharge cell partitioned by the partition wall 500.

The line parts 530a, 530b, 570a, and 570b may be spaced apart from each other within a discharge cell.

For example, the first line portion 530a and the second line portion 530b of the first electrode 540 are spaced apart from each other at a distance d1, and the first line portion 570a of the second electrode 580 may be spaced apart from each other. The second line portions 570b may be spaced apart at a distance d2. Here, the intervals d1 and d2 may be the same or may be different from each other.

Alternatively, two or more line portions may be adjacent to each other.

In addition, these line portions 530a, 530b, 570a, and 570b have a predetermined width.

For example, the first line portion 530a of the first electrode 540 may have a width of W1, and the second line portion 530b may have a width of W2. Here, W1 and W2 may be the same or may be different.

Here, the shapes of the first electrode 540 and the second electrode 580 may be symmetric with each other in the discharge cell.

In addition, the first electrode 540 and the second electrode 580 may include one or more protrusions 510a, 510b, 510c, 550a, 550b, and 550c parallel to the third electrode 590.

The protrusions 510a, 510b, 510c, 550a, 550b, and 550c may protrude from one or more of the plurality of line parts 530a, 530b, 570a, and 570b. For example, the first protrusions 510a and 510b of the first electrode 540 may protrude from the first line portion 530a, and the second protrusion 510c may protrude from the second line portion 530b. .

The protrusions 510a, 510b, 510c, 550a, 550b, and 550c are the first electrodes in the portions where the protrusions 510a, 510b, 510c, 550a, 550b, and 550c are formed in the discharge cells partitioned by the partition wall 500. The gap g1 between 540 and the second electrode 580 is made shorter than the gap g2 in other parts. Accordingly, the start voltage of the discharge generated between the first electrode 540 and the second electrode 580, that is, the discharge voltage can be lowered.

In addition, the protrusions 510a, 510b, 510c, 550a, 550b, and 550c may overlap with the third electrode 590 in the discharge cell. In this manner, the discharge voltage between the first electrode 540 and the third electrode 590 and the discharge voltage between the second electrode 580 and the third electrode 590 may be lowered.

In addition, the first electrode 540 and the second electrode 580 may include connecting parts 520 and 560 connecting two or more of the plurality of line parts 530a, 530b, 570a, and 570b.

For example, the connection part 520 connects the first line part 530a and the second line part 530b in the first electrode 540, and the connection part 560 in the second electrode 580 is the first line. The unit 570a and the second line unit 570b may be connected.

The connections 520 and 560 may allow the discharge to be evenly spread throughout the discharge cells.

Next, referring to FIG. 5B, the protrusions 510a, 510b, 510c, 550a, 550b, and 550c may have a curvature.

In addition, curvature may be provided between the line portions 530a, 530b, 570a, and 570b of the first electrode 540 and the second electrode 580 and the connection portions 520 and 560.

As shown in FIG. 5B, when the first electrode 540 and the second electrode 580 have curvature, wall charges may be evenly distributed in the discharge cell without being concentrated in a specific portion. Accordingly, the discharge can be stabilized in the discharge cell.

Next, FIG. 6 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display panel according to an exemplary embodiment of the present invention.

7 is a view for explaining an example of the operation of the plasma display panel according to an embodiment of the present invention.

First, referring to FIG. 6, in a plasma display panel according to an exemplary embodiment of the present invention, an image frame for implementing gray levels of an image may be divided into a plurality of subfields having different emission counts.

Although not shown, one or more subfields among the plurality of subfields may be grayed out according to a reset period for initializing discharge cells, an address period for selecting discharge cells to be discharged, and the number of discharges. It can be divided into the sustain period to implement.

For example, in the case where it is desired to display an image with 256 gray levels, for example, one image frame is divided into eight subfields SF1 to SF8 as shown in FIG. 6, and each of the eight subfields SF1 to SF8. Can be subdivided into a reset period, an address period and a sustain period.

The gray scale weight of the corresponding subfield may be set by adjusting the number of the sustain signals supplied in the sustain period. That is, a predetermined gray scale weight can be given to each subfield using the sustain period. For example, the gray scale weight of each subfield is 2 ⁿ by setting the gray scale weight of the first subfield to 2 ⁰ and the gray scale weight of the second subfield to 2 ¹ (where n = 0, 1). , 2, 3, 4, 5, 6, and 7) to increase the gray scale weight of each subfield. As described above, the number of sustain signals supplied in the sustain period of each subfield is adjusted according to the gray scale weight in each subfield, thereby implementing gray levels of various images.

A plasma display panel according to an embodiment of the present invention uses a plurality of image frames to implement an image, for example, to display an image of 1 second. For example, 60 image frames are used to display one second of images. In this case, the length T of one image frame may be 1/60 second, that is, 16.67 ms.

In FIG. 6, only one image frame is composed of eight subfields. However, the number of subfields constituting one image frame may be variously changed. For example, one video frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one video frame may be configured with 10 subfields.

In addition, in FIG. 6, subfields are arranged in the order of increasing magnitude of gray scale weight in one image frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one image frame. Alternatively, subfields may be arranged regardless of the gray scale weight.

Next, referring to FIG. 7, an example of an operation of the plasma display apparatus according to an exemplary embodiment of the present invention in any one of a plurality of subfields included in the image frame as shown in FIG. 6 is shown.

First, the first ramp-down signal may be supplied to the first electrode Y in the pre-reset period before the reset period.

In addition, while the first falling ramp signal is supplied to the first electrode Y, a pre-sustain signal in a polarity opposite to the first falling ramp signal may be supplied to the second electrode Z.

Here, the first falling ramp signal supplied to the first electrode Y may gradually fall to the tenth voltage V10.

In addition, the pre-sustain signal can keep the pre-sustain voltage Vpz substantially constant. Here, the pre-sustain voltage Vpz may be a voltage of the sustain signal SUS supplied in a subsequent sustain period, that is, a voltage approximately equal to the sustain voltage Vs.

As such, when the first falling ramp signal is supplied to the first electrode Y and the presuspension signal is supplied to the second electrode Z in the pre-reset period, a wall of a predetermined polarity is formed on the first electrode Y. Wall charges are accumulated, and wall charges of opposite polarity to the first electrode Y are accumulated on the second electrode Z. For example, positive wall charges may be accumulated on the first electrode Y, and negative wall charges may be accumulated on the second electrode Z.

This makes it possible to generate a set-up discharge of sufficient intensity in the subsequent reset period, which in turn makes it possible to perform the initialization sufficiently stably.

In addition, even when the voltage of the rising ramp signal Ramp-Up supplied to the first electrode Y becomes smaller in the reset period, it is possible to generate the setup discharge of sufficient intensity.

From the viewpoint of securing the driving time, a pre-reset period is included before the reset period in the subfields arranged first in time among the subfields of the image frame, or before the reset period in two or three subfields of the subfields of the image frame. It is also possible to include a pre-reset period.

Alternatively, this pre-reset period may be omitted in all subfields.

After the pre-reset period, in a set-up period of a reset period for initialization, a ramp-up signal in a direction opposite to that of the first falling ramp signal may be supplied to the first electrode Y.

Here, the rising ramp signal may include a first rising ramp signal gradually increasing with a first slope from the twentieth voltage V20 to the thirtieth voltage V30 and the second rising ramp signal from the thirtieth voltage V30 to the forty-th voltage V40. It may include a second rising ramp signal rising to the slope.

In this setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

Here, it is preferable that the second slope of the second rising ramp signal is gentler than the first slope. As such, when the second slope is made gentler than the first slope, the voltage is increased relatively quickly until the setup discharge occurs, and the voltage is increased relatively slowly while the setup discharge occurs. The amount of light generated by the setup discharge can be reduced.

Accordingly, the contrast characteristic can be improved.

In a set-down period after the set-up period, a second ramp-down signal in a direction opposite to that of the ramp ramp signal may be supplied to the first electrode Y after the ramp ramp signal.

Here, the second falling ramp signal may gradually fall from the 20th voltage V20 to the 50th voltage V50.

As a result, weak erase discharge, that is, set-down discharge, occurs in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated in the discharge cells remain uniformly.

Next, FIGS. 8A to 8B are diagrams for describing another form of the rising ramp signal or the second falling ramp signal.

First, referring to FIG. 8A, the rising ramp signal gradually increases from the thirtieth voltage V30 to the forty-th voltage V40 after rapidly rising to the thirtieth voltage V30.

As such, the rising ramp signal may be gradually raised to different slopes over two stages as shown in FIG. 7, and may be gradually raised in one stage as shown here in FIG. 8A. It is possible to change.

Next, referring to FIG. 8B, the second falling ramp signal has a form in which the voltage gradually decreases from the thirtieth voltage V30.

As described above, the second falling ramp signal may be changed in various forms, such as a different point in time at which the voltage falls.

Meanwhile, in the address period after the reset period, a scan bias signal that substantially maintains a voltage higher than the 50 th voltage V50 of the second falling ramp signal may be supplied to the first electrode Y. FIG.

In addition, a scan signal Scan which decreases by the scan voltage ΔVy from the scan bias signal may be supplied to all of the first electrodes Y1 to Yn.

For example, the first scan signal Scan 1 is supplied to the first first electrode Y1 of the plurality of first electrodes Y, and then the second scan signal (2) is applied to the second first electrode Y2. Scan 2) is supplied, and the n-th scan signal Scan n is supplied to the n-th first electrode Yn.

On the other hand, the width of the scan signal in units of subfields may vary. That is, the width of the scan signal Scan in at least one subfield may be different from the width of the scan signal Scan in other subfields. For example, the width of the scan signal Scan in the subfield located later in time may be smaller than the width of the scan signal Scan in the subfield located earlier. In addition, the scan signal scan width decreases according to the arrangement order of the subfields gradually, such as 2.6 ms (microseconds), 2.3 ms (microseconds), 2.1 ms (microseconds), 1.9 ms (microseconds), and the like. Or 2.6 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.1 ㎲ (microseconds) ... 1.9 ㎲ (microseconds), 1.9 ㎲ (microseconds) It could be done.

As such, when the scan signal Scan is supplied to the first electrode Y, a data signal rising by the magnitude ΔVd of the data voltage may be supplied to the third electrode X to correspond to the scan signal.

As the scan signal Scan and the data signal Data are supplied, the voltage difference between the voltage of the scan signal and the data voltage Vd of the data signal and the wall voltage generated by the wall charges generated in the reset period are In addition, address discharge may occur in a discharge cell to which the voltage Vd of the data signal is supplied.

Here, a sustain bias signal may be supplied to the second electrode Z to prevent address discharge from becoming unstable due to interference of the second electrode Z in the address period.

Here, the sustain bias signal may maintain a substantially constant sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and greater than the voltage of the ground level GND.

Thereafter, the sustain signal SUS may be alternately supplied to the first electrode Y and / or the second electrode Z in the sustain period for displaying an image. The sustain signal SUS may have a magnitude of a voltage of ΔVs.

When the sustain signal SUS is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal SUS, and the first electrode when the sustain signal SUS is supplied. A sustain discharge, that is, a display discharge, may be generated between (Y) and the second electrode Z.

Next, FIG. 9 is a diagram for explaining another type of the sustain signal.

Referring to FIG. 9, a positive sustain signal and a negative sustain signal are alternately supplied to any one of the first electrode Y or the second electrode Z, for example, the first electrode. do.

As such, while a positive sustain signal and a negative sustain signal are supplied to any one electrode, a bias signal may be supplied to the other electrode, for example, the second electrode Z.

Here, the bias signal may maintain the voltage of the ground level GND substantially constant.

As shown in FIG. 9, when the sustain signal is supplied only to one of the first electrode Y and the second electrode Z, one of the first electrode Y and the second electrode Z may be used. Only one driving board in which circuits for supplying a sustain signal is arranged is required.

Accordingly, the overall size of the driving unit for driving the plasma display panel can be reduced, thereby reducing the manufacturing cost.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described in detail above, the plasma display panel according to the embodiment of the present invention is disposed between the substrate and the electrode with a black material including black particles having a diameter of 1 μm (micrometer) or more and 4 μm (micrometer) or less. By forming the black layer, the effect of reducing the number of manufacturing steps and the manufacturing time of the black layer to reduce the manufacturing cost, and also prevent the discoloration of the electrode or the substrate, thereby suppressing the decrease in driving efficiency There is.

Claims (13)

Board; A black layer formed on the substrate; And An electrode formed on the black layer; Including, The black layer includes black particles having a diameter of 1 μm (micrometer) or more and 4 μm (micrometer) or less, And the black layer is thicker than the electrode. delete The method of claim 1, And a thickness of the black layer is 2 μm (micrometer) or more and 8 μm (micrometer) or less. delete The method of claim 1, The black particles include at least one of cobalt (Co) material or ruthenium (Ru) material. The method of claim 1, The black particle has a diameter of 1.5 μm (micrometer) or more and 3 μm (micrometer) or less. The method of claim 1, The electrode is a plasma display panel of a single layer (One Layer). The method of claim 7, wherein The electrode includes a plasma (Ag) material. The method of claim 7, wherein And a color of the electrode is darker than that of the substrate. delete delete delete delete

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