KR100590094B1 - Plasma display panel - Google Patents

Abstract

The plasma display panel of the present invention includes a first substrate and a second substrate disposed to face each other, a partition wall partitioning a plurality of discharge cells in a space between the first substrate and the second substrate, and a product formed in each of the discharge cells. R), green (G) and blue (B) phosphor layers, a discharge holding electrode having a first electrode and a second electrode corresponding to each discharge cell in the first substrate, and the first substrate on the first substrate An intermediate electrode disposed between the electrode and the second electrode corresponding to each discharge cell, and an address electrode formed on the second substrate, wherein the discharge cell has a phosphor layer of the same color adjacent to the discharge cell in the longitudinal direction; When the distance between the vertical axes passing through the center of each cell is d, and the distance between the centers of a pair of adjacent discharge cells in the discharge cell width direction is Ps, d = Ps × α, 0 <α <1.5 (α is a rational number), and the partition wall is A vertical partition wall member for partitioning an area including the center of all cells, and an oblique partition wall member for connecting discharge cells having phosphor layers of the same color adjacent to the discharge cell in a longitudinal direction, wherein the first electrode further includes a conductive electrode It is configured.

Plasma Display, High Definition, Exhaust

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

2 is a waveform diagram illustrating the operation of a general four-electrode structure.

3 is a partial plan view showing a plasma display panel showing another configuration of the first electrode.

4 is a schematic diagram schematically showing a discharge cell structure according to an embodiment of the present invention.

5 and 6 are schematic diagrams showing a state in which the horizontal partition member is further formed in the discharge cell structure as described above.

7 to 9 are schematic diagrams illustrating an address electrode structure applicable to a plasma display panel according to an exemplary embodiment of the present invention.

10 is a partially exploded perspective view showing a conventional plasma display panel.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a discharge cell structure that is advantageous for realizing high definition displays.

In general, a plasma display panel uses an image of red (R), green (G), and blue (B) visible light generated by excitation of a phosphor by vacuum ultraviolet (VUV) radiation emitted from a plasma obtained through gas discharge. It is a display element to implement. Such a plasma display panel can realize a large screen of 60 inches or more with a thickness of only 10 cm or less, and since it is a self-luminous display device such as a CRT, it has no characteristic of distortion due to color reproduction and viewing angle, and also has a manufacturing method compared to LCD. Its simplicity makes it a popular TV and industrial flat panel display, which has strengths in terms of productivity and cost.

Referring to FIG. 10, in a typical AC plasma display panel, address electrodes 115 are formed on one side of a rear substrate 112 in one direction and cover the address electrodes 115 to cover a dielectric layer on the front surface of the rear substrate 112. 120) is formed. A plurality of stripe-shaped partition walls 117 are formed on the dielectric layer 120 so as to be disposed between the address electrodes 115, and red (R), green (G), and blue (blue) layers are formed between the partition walls 117. B) A phosphor layer 118 of color is formed.

In addition, one surface of the front substrate 111 facing the rear substrate 112 includes a pair of transparent electrodes 113a and 114a and bus electrodes 113b and 114b along a direction crossing the address electrodes 115. The discharge sustain electrodes 113 and 114 are formed, and the dielectric layer 121 and the MgO passivation layer 123 are sequentially formed on the entire front substrate 111 while covering the discharge sustain electrodes 113 and 114.

The point where the address electrodes 115 on the rear substrate 112 and the pair of discharge sustaining electrodes 113 and 114 on the front substrate 111 cross each other corresponds to the discharge cell 119.

More than millions of unit discharge cells are arranged in a matrix form in the plasma display panel configured as described above. In order to simultaneously drive the discharge cells of the AC plasma display panel arranged in the matrix form, driving is performed using a memory characteristic.

The above-mentioned stripe-type barrier rib structure has only one direction of partition member, so the manufacturing process is simple and advantageous in the exhaust process. However, the discharge efficiency or luminance is lowered and separate partition members are formed between discharge cells adjacent in the vertical direction. Therefore, a problem of crosstalk between discharge cells occurs.

In order to improve the shortcomings of the stripe partition structure, a rectangular closed partition structure in which the vertical partition members and the horizontal partition members are formed in a lattice shape has been proposed. Under such a structure, phosphors can be applied to four wall surfaces of the discharge cells, thereby applying phosphors. The area is increased, thereby improving the brightness, and it is possible to reduce the optical crosstalk caused by the partition wall even if a component such as a light shielding film is not separately disposed between discharge cells adjacent in the vertical direction.

However, in such a rectangular closed partition structure, all four sides of the discharge cells are blocked by the partition walls, which causes a problem of poor exhaust conductance during the vacuum exhaust process. For the purpose of improving the partition pattern, when the line widths of the horizontal bulkheads and the vertical bulkheads are different, the bulkheads in one direction shrink due to a lot of thermal stress relaxation in the firing process. If the vertical bulkhead is thick, the exhaust port can be opened in the vertical direction, but the discharge space in the horizontal direction is insufficient. If the horizontal bulkhead is thick, the exhaust port can be opened in the left and right directions, but there is a fear of mixing.

In addition, it is possible to control the shape so as to partially open by raising the base without being completely blocked in the vertical direction, but there is a problem of yield rate because separate management is required for shape control for this part.

Currently, information devices used not only in the industrial field but also in daily life are required to process more diverse information, and display elements also need to express a larger amount of image information. Plasma display panels recently introduced on the market show XGA (1024 × 768) resolution at 42 inches, and ultimately, they must be able to express Full HD (High Definition) images.

It is known that the efficiency is improved by increasing the gap between the discharge holding electrodes facing each other in each discharge cell. In recent years, however, the cell pitch has been gradually decreasing due to the development of HDTV. As the cell structure becomes smaller, the discharge space becomes narrower. It is difficult to secure, and in particular, it is more difficult to secure the vertical length of the discharge cells related to the gap between the discharge sustain electrodes, which causes a decrease in luminance. In order to obtain the positive beam effect, the gap between electrodes should be about 400 μm, and when the discharge cell pitch becomes small, such an effect cannot be utilized.

As described above, the biggest problem in realizing a high resolution of the plasma display panel is a decrease in luminance due to an increase in resolution. As is well known, a plasma display panel is a display device using a discharge phenomenon, and an increase in resolution causes a reduction in discharge space and a reduction in aperture ratio relative to a display area.

Therefore, in order to secure a sufficient inter-electrode gap while overcoming the limit of the reduced cell pitch, a discharge cell structure that can replace the existing rectangular barrier rib structure having a rectangular planar shape of each discharge cell is required. It needs to be adapted to the structure.

The present invention was devised to solve the above problems, and an object thereof is to provide a partition capable of smoothly exhausting the gas by completely or partially opening the partition blocking the up and down direction, and at the same time between the adjacent discharge cells. It is to provide a plasma display panel having an electrode structure that can eliminate the interference problem.

Another object of the present invention is to provide a plasma display panel having improved efficiency by modifying the shape of the partition wall to sufficiently secure the gap between the discharge sustaining electrodes in the discharge cell while maintaining the discharge cell pitch at a high definition.

It is still another object of the present invention to provide a plasma display panel in which the contrast is improved by making the contrast of the discharge cells clear while sufficiently securing the aperture ratio of the discharge cells.

In order to achieve the above object, the plasma display panel provided by the present invention,

First and second substrates disposed to face each other, a partition wall partitioning a plurality of discharge cells in a space between the first and second substrates, red (R) and green (G) formed in each of the discharge cells A phosphor layer of blue (B) color, a discharge sustain electrode having a first electrode and a second electrode corresponding to each discharge cell in the first substrate, between the first electrode and the second electrode on the first substrate; A vertical axis passing through the center of each of the discharge cells including an intermediate electrode disposed to correspond to each discharge cell and address electrodes formed on the second substrate, wherein the discharge cells have a phosphor layer of the same color adjacent in the longitudinal direction of the discharge cell; When the distance between them is called d and the distance between the centers of a pair of adjacent discharge cells in the discharge cell width direction is Ps, d = Ps × α and 0 <α <1.5 (α is a rational number). Satisfies the above, and partitions an area including the center of the discharge cell Is vertical partition wall member, including the oblique partition wall member that connects the discharge cells having phosphor layers of the same color are adjacent in the longitudinal direction of the discharge cells, and configured to include more of the first electrode is a conductive electrode.

In the present invention, the discharge holding electrode may include a bus electrode passing over the oblique partition wall member, and a protruding electrode extending from the bus electrode toward the center of each discharge cell, wherein the protruding electrode is transparent. The conductive electrode may be formed in contact with the protruding electrode.

In addition, in the present invention, the conductive electrode may be formed in a bar shape having a width smaller than the width of the protruding electrode, and may be formed to extend in the direction in which the transparent electrode protrudes from the bus electrode. .

In the present invention, the first electrode may include a bus electrode passing over the oblique partition wall member, wherein the conductive electrode extends from the bus electrode toward the center of each discharge cell.

In the present invention, the intermediate electrode may include a bus electrode extending in a direction crossing the address electrode, and a transparent electrode extending along the bus electrode and having a larger width.

On the other hand, in the present invention, the vertical length of the vertical partition wall member may be in the range of 1/3 to 1/2 of the pitch of the vertical discharge cell, the diagonal partition member is a phosphor layer of the same color adjacent in the discharge cell length direction It may be formed in a structure that connects the vertical partition wall member of the discharge cells having.

The present invention may further include a horizontal partition member that extends in a direction perpendicular to the vertical partition member and crosses the diagonal partition member, and includes a horizontal partition member that crosses the diagonal partition member at a right angle. It may further include.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a partial plan view showing a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 1, in the plasma display panel according to the present exemplary embodiment, a first substrate (not shown) and a second substrate (not shown) are basically disposed to face each other at a predetermined interval, and a plasma is formed in a space between the two substrates. A plurality of discharge cells 23R, 23G, 23B are formed by the partition walls 17 so as to cause discharge. The illustrated partition wall 17 is shown as a single line for the sake of simplicity of the drawing, but may be formed to have a predetermined width in practice, and the same also applies to the following drawings. On the second substrate facing surface of the first substrate, discharge holding electrodes 12 and 13 facing each other along one direction (x-axis direction of the drawing) of the substrate are formed, and between the discharge holding electrodes 12 and 13. The intermediate electrode 14 is formed. Accordingly, the plasma display panel of this embodiment has a four-electrode structure. On the first substrate facing surface of the second substrate, a plurality of address electrodes 21 are formed along a direction crossing the discharge sustain electrodes 12 and 13.

In this embodiment, the discharge sustaining electrode is composed of the first electrode 12 and the second electrode 13 in its functional action. 2 is a waveform diagram illustrating the operation of a general four-electrode structure. The subfield operation of the four-electrode structure will be described with reference to this, and accordingly, the first electrode 12 and the second electrode 13 in functional function are defined.

1. Reset period (I)

During the initial period (I-1) of this period, the second electrode 13 is biased to the ground voltage, the intermediate electrode 14 is applied with a reset voltage which is initially lowered and then rises, and the intermediate electrode is applied to the first electrode 12. A voltage of opposite polarity is applied. Then, a discharge is induced between the intermediate electrode 14 and the first electrode 12 to erase the wall charge state.

2. Address period (II)

In this period (II), while the intermediate electrode 14 is biased, a scan voltage for selecting a discharge cell to be turned on is applied to the address electrode 21. At this time, the intermediate electrode 14 is maintained at a ground voltage, and the second electrode 13 maintains a voltage of a predetermined level as it is. Then, a discharge occurs between the intermediate electrode 14 and the address electrode 21 to accumulate wall charges in the selected discharge cell.

3. Retention period (III)

During this period (III), while the intermediate electrode 14 is biased with the sustain discharge voltage, the sustain discharge voltage pulses are alternately applied to the first electrode 12 and the second electrode 13. At this time, since the positive wall charges accumulated through the address period II are accumulated on the first electrode 12 acting negatively during this period II, the first electrode 12 is the first electrode 12. Input a signal whose sustain discharge voltage is positive. Accordingly, sustain discharge occurs in the discharge cells selected in the address period II, thereby displaying an image.

As described above, the first electrode 12 and the second electrode 13 have different functional functions, and through this specification, the first electrode 12 receives positive wall charges in the address period. It means an electrode which is stacked and inputs a positive pulse for the first time in the sustain period.

1, the first electrode 12 and the second electrode 13 are respectively extended bus electrodes 12b and 13b extending in the direction crossing the address electrode 21, and the bus electrodes 12b and 13b. Protruding electrodes 12a and 13a extending toward the center of each of the discharge cells 23R, 23G, and 23B. The bus electrodes 12b and 13b may be made of metal electrodes, and the protruding electrodes 12a and 13a may be made of transparent electrodes, and may be formed of indium tin oxide (ITO).

The first electrode 12 further includes a conductive electrode 12c formed in contact with the protruding electrode 12a. The conductive electrode 12c is formed in the same direction as the direction in which the protruding electrode 12a extends, and has a bar shape having a width smaller than that of the protruding electrode 12a. The conductive electrode 12c is formed of the same dark conductive material as the bus electrode 12b.

Meanwhile, in the plasma display panel disclosed in FIG. 1, the first electrode 12 includes the conductive electrode 12c formed on the protruding electrode 12a. However, as shown in FIG. 3, the first electrode 12 intersects with the bus electrode 12b. It may be configured as a pair of conductive electrodes 12c formed inside the discharge cell.

Since the conductive electrode 12c makes the contrast between the first electrode and the second electrode clearer in the discharge cell, the contrast becomes better when the entire panel is viewed, so that the contrast is improved and the conductivity is good. In the sustain period, the magnitude of the voltage required to start discharge can be relatively lowered. Accordingly, the discharge efficiency of the panel can be improved satisfactorily, and since the conductive electrode 12c is selectively formed only with the first electrode 12, the aperture ratio of the discharge cell can be ensured.

The intermediate electrode 14 is disposed between the pair of discharge sustaining electrodes 12 and 13 to correspond to the discharge cells 23R, 23G, and 23B, and crosses the address electrode in a stripe shape (see FIG. a bus electrode 14b extending in the x-axis direction) and a transparent electrode 14a extending in the same manner as the bus electrode 14b.

The discharge cell structure of this embodiment will be described in detail with reference to FIG. 4 as follows.

The discharge cells 23R, 23G, and 23B formed by the partition walls 17 have a plurality of discharge cell rows arranged adjacent to each other in the discharge cell width direction (x-axis direction of the drawing) in the longitudinal direction and are planar. The display screen on the screen. Each of these discharge cells 23R, 23G, and 23B constitutes a subpixel. In the plasma display panel, subpixels of red (R), green (G), and blue (B) colors are arranged adjacent to each other to form one pixel. Subpixels of R), green (G) and blue (B) colors are arranged adjacent to each other in the discharge cell width direction in a single discharge cell row.

In the present embodiment, the discharge cells 23R, 23G, and 23B have a spacing between the vertical axes passing through the center of each of the discharge cells having the phosphor layer of the same color adjacent to each other in the discharge cell length direction, and d is the discharge cell width direction. When the distance between the centers of a pair of adjacent discharge cells is referred to as Ps, the conditions d = Ps × α and 0 <α <1.5 (α is a rational number) are satisfied. In other words, Ps is the horizontal discharge cell pitch, and d is the moving distance of the next adjacent discharge cell row based on any one discharge cell row. For example, if α = 1, it is a case where one subpixel moves laterally. In the case of α = 0, it corresponds to the case of no movement (conventional rectangular closed structure), and in the case of α> 1.5, discharge cells having the same color phosphor layers in opposite directions are adjacent to each other.

Furthermore, in the present embodiment, the partition wall 17 includes a vertical partition wall member 17a that partitions an area including the center of the discharge cells 23R, 23G, and 23B, and a longitudinal direction of the discharge cells 23R, 23G, and 23B. It consists of an oblique partition wall member 17b which connects discharge cells 23R, 23G, 23B having phosphor layers of the same color adjacent to each other. The diagonal partition wall member 17b connects the discharge cells by connecting the vertical partition wall members 17a of the discharge cells 23R, 23G, and 23B having the same color phosphor layers adjacent to each other in the discharge cell length direction.

In the discharge cell structure formed as described above, a wider discharge space can be ensured than in the conventional rectangular closed structure. The effect of the discharge space expansion will be described with reference to the discharge length defined in FIG. 4 and the following equation (1).

Where Pv is the vertical pixel pitch and Ps is the horizontal subpixel pitch. K is the length of the vertical partition member 17a, and α is a variable representing the degree of movement of the subpixels, and as described above, Ps × α = d. For example, the discharge cell structure shown in FIG. 4 corresponds to the case of (k, α) = (1/3, 1). The longer the discharge length is, the more favorable the discharge is.

Table 1 below is a result of comparing the discharge lengths for various (k, α) with the length of a conventional discharge cell (square closed type structure) as 1.

Sub-pixel travel distance (α) k α Discharge distance / Pv 1 (subpixel) 0.75 One 1.17 One 0.50 One 1.10 One 0.33 One 1.08 One 0.25 One 1.07 0.5 (subpixel) 0.75 0.5 1.05 0.5 0.50 0.5 1.03 0.5 0.33 0.5 1.02 0.5 0.25 0.5 1.02 1.5 (subpixel) 0.75 1.5 1.31 1.5 0.50 1.5 1.21 1.5 0.33 1.5 1.17 1.5 0.25 1.5 1.15

In the case of α = 1.5, it is 1.5 times the horizontal subpixel pitch Ps, which is longer than when the α having a small discharge length is applied, whereby the efficiency improvement effect due to long gap discharge can be obtained more. have.

On the other hand, if α is too large, the ripple amplitude increases, which may be disadvantageous to the structure contour. Therefore, it is preferable that the length of the discharge is increased to about 10% or so, and α = 1 where the outline is not prominent. k is preferably formed to fall in the range of approximately 1/3 to 1/2.

On the other hand, since the thickness of the partition wall has a constant value, the actual discharge space is reduced by their volume. This problem becomes more severe as the resolution becomes higher, so the effect of discharging space expansion is greater without considering the horizontal bulkhead member. In the case of (k, α) = (1/3 to 1/2, 1), there is an effect of extending 8 to 10% of the vertical pixel pitch Pv compared to the conventional structure. More specifically, when a discharge cell having a vertical pixel pitch Pv of 0.5 mm is formed as a 50 μm wide partition wall, the width of the horizontal partition wall member corresponds to 10% of the vertical pixel pitch Pv. The conventional structure having the discharge length is 90% of the vertical pixel pitch Pv, while the structure according to the present invention is 110%, which is relatively about 20%.

In addition, in the discharge cell structure having the vertical partition member 17a and the diagonal partition member 17b as described above without forming the horizontal partition member, high exhaust conductance efficiency can be achieved and the spacing between the partition member members is approximately equal. As a result, in the process of applying the sand blasting method, it is possible to evenly apply the impact of a certain strength to the partition wall, thereby preventing damage to the partition wall.

In the case of not employing the horizontal partition member as described above, the intermediate electrode 14 as shown in FIG. 1 is particularly provided, and together with the electrode structure capable of causing addressing discharge to the intermediate electrode 14 and the address electrode 21 together. It is desirable to apply. This is advantageous in preventing crosstalk between adjacent discharge cells.

Nevertheless, as described above, it is also possible to adopt and use the horizontal partition member in the discharge cell structure composed of the vertical partition member and the diagonal partition member. 5 and 6 are schematic diagrams showing a state in which the horizontal partition member is further formed in the discharge cell structure as described above.

In the structure shown in FIG. 5, the horizontal partition wall member 18 extends in a direction perpendicular to the vertical partition wall member 17a across the diagonal partition wall member 17b to form a stripe shape.

In the structure shown in FIG. 6, the horizontal partition wall member 19 is formed to intersect the diagonal partition wall member 17b at a right angle. Therefore, adjacent horizontal bulkhead members 19 are adjacent to be shifted by a predetermined length without successive.

7 to 9 are schematic diagrams illustrating an address electrode structure applicable to a plasma display panel according to an exemplary embodiment of the present invention.

In the plasma display panel according to each embodiment of the present invention, the address electrodes are preferably formed to extend in a direction in which the discharge cells having the phosphor layer of the same color extend in the longitudinal direction.

FIG. 7 shows an address electrode having an extended portion at a portion facing the discharge sustaining electrode and an intermediate electrode, FIG. 8 shows an address electrode having an extended portion at a portion corresponding to the center portion of the discharge cell, and FIG. The address electrode having an extension portion in a portion facing the scan electrode is shown.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display panel according to the present invention, the barrier ribs capable of smoothly exhausting by opening or closing the barrier ribs blocking the vertical direction are eliminated and the interference problem between neighboring discharge cell rows is eliminated. It can work.

In addition, while maintaining the discharge cell pitch, the gap between the discharge holding electrodes facing each other in the discharge cell is sufficiently secured.                     

In addition, in the present invention, the conductive electrode constituting the first electrode has the effect of lowering the minimum voltage size required to generate a discharge in the sustain period, thereby improving the efficiency of the panel. The conductive electrode has an effect of improving contrast by sharpening the contrast between the portion where the conductive electrode is installed and the portion where the conductive electrode is not disposed in the discharge cell, and selectively transmits light through the discharge cell because the conductive electrode is selectively configured. The opening part to be used can be fully secured.

Claims (14)

A first substrate and a second substrate disposed to face each other; Barrier ribs defining a plurality of discharge cells in a space between the first substrate and the second substrate; Phosphor layers of red (R), green (G), and blue (B) colors formed in the respective discharge cells; A discharge holding electrode having a first electrode corresponding to each discharge cell on the first substrate and having a conductive electrode and a second electrode; An intermediate electrode disposed on the first substrate to correspond to each discharge cell between the first electrode and the second electrode; Address electrodes formed on the second substrate; The distance between the vertical axes passing through the center of each of the discharge cells having the phosphor layer of the same color adjacent to each other in the discharge cell longitudinal direction is referred to as d, and the center of the pair of adjacent discharge cells in the discharge cell width direction is d. When the inter-distance is Ps, it satisfies the condition that d = Ps × α, 0 <α <1.5 (α is rational) And a diagonal partition member connecting the discharge cells each having a vertical partition member partitioning a region including the center of the discharge cell and a phosphor layer of the same color adjacent in the length direction of the discharge cell. The method of claim 1, And a bus electrode through which the discharge sustaining electrode passes over the diagonal partition member, and a protruding electrode extending from the bus electrode toward the center of each discharge cell. The method of claim 2, And the conductive electrode is in contact with the protruding electrode. The method of claim 3, And the conductive electrode is formed in a bar shape with a width smaller than that of the protruding electrode. The method of claim 3, And the conductive electrode extends along a direction in which the transparent electrode protrudes from the bus electrode. The method of claim 1, The first electrode includes a bus electrode passing across the diagonal partition member, And the conductive electrode extends from the bus electrode toward the center of each discharge cell. The method according to any one of claims 2 to 6, And the conductive electrode is formed of the same dark metal electrode as the bus electrode. The method of claim 1, And a bus electrode which extends in the direction in which the intermediate electrode intersects the address electrode, and a transparent electrode which has a greater width along the bus electrode. The method according to any one of claims 1 to 6, And a vertical length of the vertical barrier rib member is in a range of 1/3 to 1/2 of a pitch of a vertical discharge cell. The method according to any one of claims 1 to 6, And the diagonal partition wall member connects the vertical partition wall members of the discharge cells having the same color phosphor layer in the discharge cell length direction. The method according to any one of claims 1 to 6, And a horizontal partition wall member extending across the diagonal partition wall member in a direction perpendicular to the vertical partition wall member. The method according to any one of claims 1 to 6, And a horizontal partition member formed to intersect the diagonal partition member at a right angle. The method according to any one of claims 1 to 6, And the address electrode is formed to extend in a direction in which discharge cells having phosphor layers of the same color extend in the longitudinal direction. The method of claim 13, And the address electrode has an extension in a portion corresponding to the discharge cell.

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