KR100578851B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel capable of uniformizing phosphor efficiency and discharge characteristics of a discharge cell by optimizing a structure of a partition wall according to red, green, and blue phosphor characteristics, comprising: a first substrate and a second substrate facing each other; Address electrodes formed on the second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition the discharge cells; Red, green, and blue fluorescent layers formed in each discharge cell; And discharge holding electrodes formed on the first substrate, wherein the partition wall is formed in a direction crossing the address electrodes with the first partition members extending along the direction of the address electrode and connected to the first partition members at an inclination angle. Θ (R) is the inclination angle between the second partition member and the first partition member in the red discharge cell, and θ (G) is the second partition member and the first partition member in the green discharge cell Θ (B) is an inclination angle formed by the second partition member and the first partition member in the blue discharge cell, at least two or more of θ (R), θ (G), and θ (B) Provided is a plasma display panel in which a second partition member is formed to have a different value. In this case, the second partition member may satisfy a condition of θ (R) <θ (G) ≤ θ (B).

Plasma, Plasma Display, Bulkhead, Discharge Cell, Address Electrode

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a partially exploded perspective view of a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a plan view of the plasma display panel shown in FIG. 1.

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of uniformizing phosphor efficiency and discharge characteristics of discharge cells by optimizing a structure of a partition wall according to red, green, and blue phosphor characteristics.

In general, a plasma display panel (hereinafter referred to as a 'PDP') is a display device for realizing an image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge in a discharge cell. I am in the limelight. Such PDPs are roughly classified into alternating current, direct current type, and mixed type, and it is common to use an alternating current three-electrode surface discharge structure.

In the three-electrode surface discharge structure of the AC type, an address electrode, a partition wall, and a fluorescent layer are formed on a rear substrate corresponding to each discharge cell, and a discharge holding electrode consisting of a scan electrode and a display electrode is formed on a front substrate. The inside of the divided discharge cell is filled with discharge gas (Ne-Xe mixed gas).

Accordingly, when a discharge cell for emitting light is selected by applying a signal to the address electrode and the scan electrode, and a voltage of 150 to 200 V is applied between the scan electrode and the display electrode, the discharge gas causes plasma discharge, Vacuum ultraviolet rays having wavelengths of 147 nm, 150 nm and 173 nm are emitted from the excitation atom. And this vacuum ultraviolet-ray excites fluorescent substance and converts it into visible light, and color expression is attained.

In such a PDP, a loss occurs in various stages, from input power input to the driving circuit to display light that passes through the front substrate and reaches the viewer.

The luminous efficiency of PDP is based on circuit efficiency due to circuit loss, discharge efficiency when discharge power is converted into ultraviolet light, ultraviolet light utilization when ultraviolet light is converted into effective ultraviolet light, and phosphor efficiency when effective ultraviolet light is converted into visible light. And the sum of the visible light utilization when the visible light is converted into the display light.

Therefore, many efforts have been made to minimize the losses in each of the above-described steps when designing and manufacturing the PDP, and the efficiencies in the remaining steps except circuit efficiency are mainly the internal structure and material properties of the PDP, in particular, the structure of the discharge cell. And because of the great influence on the material properties of the discharge gas and the phosphor, many researches on this.

On the other hand, since the phosphor used for PDP has to be excited with low energy compared with the phosphor used for cathode ray tube, the choice is limited. Conventional phosphors used in PDP have low luminous efficiency, red, green and blue colors. That is, there is a disadvantage that the brightness difference is severe. This causes a difference in phosphor efficiency and discharge characteristics for each of the red, green, and blue discharge cells, and makes it difficult to adjust the white balance and the color temperature.

Accordingly, the present invention is to solve the above problems, an object of the present invention is to optimize the structure of the partition wall partitioning the discharge cells according to the red, green, blue phosphor characteristics to uniform the phosphor efficiency and discharge characteristics of the discharge cells. It is to provide a plasma display panel that can be.

In order to achieve the above object, the present invention, the first substrate and the second substrate disposed opposite to each other; Address electrodes formed on the second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition the discharge cells; Red, green, and blue fluorescent layers formed in each discharge cell; And discharge holding electrodes formed on the first substrate, wherein the partition wall is formed in a direction crossing the address electrodes with the first partition members extending along the direction of the address electrode and connected to the first partition members at an inclination angle. Θ (R) is the inclination angle between the second partition member and the first partition member in the red discharge cell, and θ (G) is the second partition member and the first partition member in the green discharge cell Θ (B) is an inclination angle formed by the second partition member and the first partition member in the blue discharge cell, at least two or more of θ (R), θ (G), and θ (B) Provided is a plasma display panel in which a second partition member is formed to have a different value.

In this case, the second partition member may satisfy the condition θ (R) <θ (G) ≤ θ (B), and θ (R) and θ (G) have angles larger than 90 degrees and smaller than 180 degrees, respectively. , θ (B) may have an angle greater than 90 degrees and less than or equal to 180 degrees.

The discharge cells may have a planar shape of two or more of a rectangle, a hexagon, and an octagon, and more specifically, the red and green discharge cells may have a planar shape of any one of a hexagon and an octagon, and the blue discharge cells may have a square, a hexagon, and an octagon. It may have a planar shape of any one of the octagons.

The maximum widths of the discharge cells along the address electrode direction may be substantially the same for each of the red, green, and blue colors.

The widths of the discharge cells along the direction perpendicular to the address electrode for each of the red, green, and blue colors may be substantially the same.

The distance between the first partition wall members in the direction orthogonal to the address electrode may be substantially the same between discharge cells of different colors, and the lengths of the first partition wall members in the address electrode direction may be different from the discharge cells of different colors. May be substantially the same.

The second partition member may be disposed between the discharge cells of the same color located along the address electrode direction to partition the discharge cells.

In addition, the plasma display panel according to the present invention may further include a non-discharge area surrounded by the second partition member.

In this case, the non-discharge region may have a different volume depending on the color of the fluorescent layer of the adjacent discharge cells.

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

1 is a partially exploded perspective view of a plasma display panel according to an embodiment of the present invention, Figure 2 is a plan view of the plasma display panel shown in FIG.

Referring to the drawings, in the plasma display panel (hereinafter referred to as 'PDP') according to the present embodiment, the first substrate 2 and the second substrate 4 are disposed to face each other at random intervals, and the space between the two substrates is provided. Discharge cells 8R, 8G, and 8B partitioned by partition 6 are provided to implement an arbitrary color image with visible light emission by an independent discharge mechanism of each discharge cell 8.

Looking at the configuration thereof, first, the address electrodes 10 are formed on the inner surface of the second substrate 4 in one direction (Y direction in the drawing), and the second substrate 4 is covered while covering the address electrodes 10. The dielectric layer 12 is formed over the entire inner surface of the substrate. For example, the address electrode 10 is formed in a stripe pattern and formed in parallel with a neighboring address electrode 10 at a predetermined interval.

The partition wall 6 is formed on the dielectric layer 12 in a closed type, and a red, green, and blue fluorescent layer is formed on the partition 6 surface and the bottom surface of the discharge cell 8 formed by the partition walls 6. 14R, 14G, and 14B are provided. The partition wall 6 includes a first partition wall member 6a in the address electrode direction and a second partition wall member 6b that intersects the first partition wall member 6a with an inclination angle. The interior of the discharge cell 8 surrounded by 6a and 6b is filled with discharge gas (Ne-Xe mixed gas).

On the inner surface of the first substrate 2 facing the second substrate 4, a discharge holding electrode 20 made up of the scan electrode 16 and the display electrode 18 is arranged along a direction orthogonal to the address electrode 10. The transparent dielectric layer and the MgO protective film (not shown) are disposed on the entire inner surface of the first substrate 2 while covering the discharge sustain electrodes 20.

In this embodiment, the discharge sustaining electrode 20 is formed in a stripe pattern, for example, and has a pair of bus electrodes 16a and 18a corresponding to each of the discharge cells 8 and each discharge cell 8 from the bus electrodes 16a and 18a. ) And protruding electrodes 16b and 18b extending inwardly to face each other. The protruding electrodes 16b and 18b may be transparent electrodes such as indium tin oxide (ITO), and it is preferable to use a conventional metal electrode as the bus electrodes 16a and 18a.

As a result, an address voltage Va is applied between the address electrode 10 and the scan electrode 16 to select a discharge cell for light emission, and a sustain voltage Vs is applied between the scan electrode 16 and the display electrode 18. When applied, the vacuum gas is emitted while the discharge gas in the discharge cell 8 causes plasma discharge, and the vacuum ultraviolet light excites the fluorescent layer 14 and converts it into visible light, thereby enabling color display.

Here, the PDP according to the present embodiment changes the structure of the partition wall 6 partitioning the discharge cells 8 according to the red, green, and blue phosphor characteristics, thereby discharging the red, green, and blue discharge cells 8R, 8G, and 8B. ), When forming one pixel, a structure in which the phosphor efficiency and discharge characteristics of the respective discharge cells 8 are equalized is applied. In this embodiment, the structure consists of applying the volume of the discharge cells 8 differentially by color while minimizing the change of components other than the partition wall 6.

That is, the non-discharge area 26 is formed together with the discharge cells 8R, 8G, and 8B which have different volumes according to the red, green, and blue phosphor characteristics and are optimized in consideration of the diffusion form of the plasma discharge during the sustain discharge. Partition partitions are provided to form a PDP.

More specifically, as shown in FIG. 2, the partition wall 6 has each of the discharge cells 8 facing the address electrode direction (Y direction in the drawing) and the direction orthogonal to the address electrode (X direction in the drawing). When the hypothetical horizontal axis H and the vertical axis V passing through the center of each discharge cell 8 are assumed, the non-discharge area (B) is surrounded by the horizontal axis H and the vertical axis V. 26) is located.

First, the optimized structure of the discharge cells 8 will be described. The structure is narrower as the widths of the upper and lower ends positioned in the address electrode directions in the respective discharge cells 8 become farther from the center of each discharge cell 8. Losing shapes can include. That is, referring to FIG. 1, the width Wc at the center of the discharge cell 8 is made larger than the width We at the end, and the width We at the end is from the center of the discharge cell 8. The farther it is, the narrower the characteristics can be. Thus, the upper and lower ends of the discharge cells 8 exhibit a triangular shape or a trapezoidal shape, and the overall planar shape of each discharge cell 8 forms a hexagon or an octagon.

However, it is possible to have a square as well as the above-described hexagon or octagon. The case where the planar shape of the discharge cell 8 is square is mentioned later.

The non-discharge region 26 is disposed in an area surrounded by the imaginary horizontal axis H and the vertical axis V passing through the center of each discharge cell 8, in particular, the center thereof is the horizontal axis H and the vertical axis V. It may be formed so as to coincide with the center of the area surrounded by them. That is, in the above structure, one common non-discharge is formed between a pair of discharge cells adjacent in the direction of the address electrode 10 and a pair of discharge cells neighboring in the direction orthogonal to the address electrode 10. Region 26 is located.

As a result, the first partition member 6a that extends the partition wall 6 along the address electrode 10 direction and the second partition member that is not parallel to the address electrode 10 but formed in a direction crossing the address electrode 10. When dividing into 6b, the 2nd partition member 6b is formed so that it may be connected with the 1st partition member 6a at predetermined inclination angle.

At this time, when the inclination angle formed by the second partition member 6b and the first partition member 6a in the discharge cell 8 is represented by θ, the inclined angle θ is red, green, or blue discharge cells 8R, 8G. , 8B) are set differently so that the discharge cells 8 have different volumes for each color. That is, the discharge cells 8 are formed such that at least two or more of θ (R), θ (G), and θ (B) have different values.

More preferably, the discharge cells 8 are formed to satisfy the condition of the following equation (1).

θ (R) <θ (G) ≤ θ (B)

Here, θ (R) is the inclination angle between the second partition member and the first partition member in the red discharge cell, θ (G) is the inclination angle between the second partition member and the first partition member in the green discharge cell, and θ ( B) represents the inclination angle between the second partition member and the first partition member in the blue discharge cell.

And θ (R), θ (G), and θ (B) each have a value satisfying the above Equation 1 within an angle greater than 90 degrees and less than or equal to 180 degrees.

If θ (R) is greater than 90, the red discharge cell 8R may have a hexagon, and if greater than a certain angle, it may have an octagon. Similarly, θ (G) has a value within an angle greater than 90 degrees and smaller than 180 while satisfying a condition larger than θ (R), so that the green discharge cells 8G may have hexagons or octagons.

And θ (B) has a value within an angle greater than 90 degrees and less than or equal to 180 while satisfying a condition greater than or equal to θ (G) so that the blue discharge cell 8B has a planar shape of hexagon, octagon, or rectangle. Can be. In the case of the blue discharge cell 8B having a rectangular planar shape, θ (B) is 180 degrees.

In addition, the discharge cells 8R, 8G, and 8B may have substantially the same maximum width D3 according to the address electrode direction (Y direction in the drawing) for each of red, green, and blue colors. That is, the length D1 of the first partition wall member 6a in the address electrode direction (Y direction) may be substantially the same between discharge cells of different colors, and discharge in the address electrode direction (Y direction). The maximum width D3 of the cells 8R, 8G, and 8B minus the length D1 of the first partition member 6a may be substantially the same between discharge cells of different colors.

In addition, the discharge cells 8R, 8G, and 8B have substantially the same widths W _R , W _G , and W _B along the direction perpendicular to the address electrode (the X direction in the drawing) for each of red, green, and blue colors. Can be. That is, the distance between the first partition wall members in the direction orthogonal to the address electrode (X direction) may be substantially the same between discharge cells of different colors.

In this way, the non-discharge regions 26 positioned along the direction (X direction) orthogonal to the address electrode 10 depend on the change of the angle θ formed by the second partition member 6b and the first partition member 6a. It is formed to have different shapes.

In this way, the discharge cells 8 are optimized in consideration of the diffusion mode of the plasma discharge (that is, the shape which starts from the space between the two protruding electrodes 16b and 18b and diffuses toward the upper and lower ends of the discharge cell 8). As a result, the fluorescent layer 14 is provided with a strong vacuum ultraviolet light over a larger area when the vacuum ultraviolet light is emitted by the plasma discharge during the sustain discharge. Accordingly, the phosphor efficiency for converting effective ultraviolet rays into visible light is increased, thereby improving discharge efficiency and screen brightness.

On the other hand, the discharge sustaining electrode 20 formed on the inner surface of the first substrate 2, in particular, the protruding electrodes 16b and 18b also has a shape optimized for the discharge cells 8. That is, the protruding electrodes 16b and 18b are formed on both sides of the rear end portions corresponding to the upper and lower ends of the discharge cells 8 side by side with the inner wall of the discharge cells 8, for example, the rear ends of the protruding electrodes 16b and 18b. The portion has a trapezoidal shape that narrows toward the bus electrodes 16a and 18a so as to match the end shape of the discharge cell 8.

In addition, each of the protruding electrodes 16b and 18b forms a concave portion 28 at the center of the opposing surface where the pair face each other and is positioned with a gap G1 between the concave portions 28. It is positioned with the gap G2 reduced from the edge. As a result, when the sustain voltage Vs is applied between the scan electrode 16 and the display electrode 18, plasma discharge starts from the space between both edges of the opposing surface corresponding to the outer portion of the discharge cell 8 and diffuses around. Then, plasma discharge starts from the space between the recesses 28 corresponding to the central portion of the discharge cell 8 and diffuses around.

Accordingly, in this modified example, the above-described protruding electrodes 16b and 18b have the shapes of the plasma discharge at the center and the outer portion of the discharge cell 8 simultaneously, thereby improving the luminance imbalance in the discharge cell 8, thereby improving discharge efficiency and instantaneous discharge. It has the advantage of increasing the brightness.

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

As described above, according to the present invention, the volume of discharge cells may be differentially applied for each phosphor color while minimizing changes in components other than the partition wall. Therefore, the present invention has the effect of uniformizing the phosphor efficiency and discharge characteristics of each discharge cell, improving color temperature characteristics, and ensuring uniformity of discharge when red, green, and blue discharge cells are collected to form a pixel.

Claims (11)

A first substrate and a second substrate disposed to face each other; Address electrodes formed on the second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition discharge cells; Red, green, and blue fluorescent layers formed in the respective discharge cells; And Including discharge sustain electrodes formed on the first substrate, The maximum widths of the discharge cells along the address electrode direction are substantially the same for each of the red, green, and blue colors, and the widths of the discharge cells along the direction perpendicular to the address electrode are substantially the same for each of the red, green, and blue colors. , The partition wall includes first partition wall members extending in the direction of the address electrode, and second partition wall members formed in a direction crossing the address electrode and connected to the first partition members at an inclination angle, θ (R) is the inclination angle between the second partition member and the first partition member in a red discharge cell, θ (G) is the inclination angle between the second partition member and the first partition member in a green discharge cell, θ (B) is an inclination angle formed by the second barrier member and the first barrier member in a blue discharge cell, and at least two or more of θ (R), θ (G), and θ (B) are different from each other. And the second partition member is formed to have a plasma display panel. The method of claim 1, And the second partition wall member satisfies a condition of θ (R) <θ (G) ≤ θ (B). The method according to claim 1 or 2, And wherein θ (R) and θ (G) have angles greater than 90 degrees and less than 180 degrees, respectively, and wherein θ (B) is greater than 90 degrees and less than or equal to 180 degrees. The method of claim 1, And the discharge cells have a planar shape of at least two of a rectangle, a hexagon, and an octagon. The method of claim 4, wherein The red and green discharge cells have a planar shape of any one of a hexagon and an octagon, and the blue discharge cells have a planar shape of any one of a rectangle, a hexagon, and an octagon. delete delete The method of claim 1, The distance between the first partition member along the direction orthogonal to the address electrode is substantially the same between the discharge cells of different colors, And a length of the first partition wall member in the address electrode direction is substantially the same between discharge cells of different colors. The method of claim 1, And the second partition member is disposed between discharge cells of the same color positioned along the address electrode direction to define the discharge cells. The method of claim 1, And a non-discharge area surrounded by the second partition member. The method of claim 10, And the non-discharge area has a different volume according to the fluorescent layer color of the adjacent discharge cells.

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