KR100683689B1 - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel in which the discharge space is enlarged, the discharge start voltage is reduced, the discharge efficiency is increased, and the luminance step on the screen is improved. To this end, in the present invention, the rear substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; Sustain discharge electrode pairs extending across the discharge cells and each having an X electrode and a Y electrode divided into predetermined lengths to divide the entire area of the front substrate into a predetermined number of areas; A first dielectric layer formed to cover the sustain discharge electrode pairs; On the back surface of the first dielectric layer, disposed between the X electrode and the Y electrode constituting the sustain discharge electrode pair, divided into a predetermined length with respect to the entire length of the front substrate, extending in parallel with the sustain discharge electrode pairs M electrodes; A second dielectric layer formed to cover the M electrodes; Address electrodes extending across the discharge cells to intersect the sustain discharge electrode pairs and the M electrodes in each discharge cell; A third dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And it provides a plasma display panel having a discharge gas in the discharge cell.

Description

Plasma display panel {Plasma display panel}

1 is a partially cutaway perspective view of a conventional plasma display panel;

2 is a partially cutaway perspective view of a plasma display panel to which the present invention is applied;

3 is a cross-sectional view taken along the line A-A of FIG. 2, showing a state in which the upper plate is rotated 90 degrees,

FIG. 4 is a diagram illustrating a conventional electrode configuration and a conventional scan method applied to the plasma display panel shown in FIG. 2.

FIG. 5 is a diagram for explaining a luminance step in the plasma display panel shown in FIG. 2; and

6 is a view showing the configuration of the electrodes disposed on the front substrate of the plasma display panel according to the present invention.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 111: front substrate

112: sustain discharge electrode pair 113: M electrode

114: first dielectric layer 115: second dielectric layer

116: protective film 121: back substrate

122: address electrode 125: third dielectric layer

126: phosphor 130: partition wall

131: X electrode 132: Y electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a reduced discharge start voltage, an increased luminous efficiency, and an improved luminance step during operation.

1 is a view showing the configuration of a conventional AC three-electrode surface discharge plasma display panel.

As shown in FIG. 1, the conventional plasma display panel 10 includes a front panel 50 displaying an image to a user and a rear panel 60 coupled in parallel thereto. The front panel 50 includes a front substrate 11 made of a transparent body, a pair of sustain discharge electrodes 12 formed of an X electrode 31 and a Y electrode 32 disposed on the front substrate 11, and the sustain discharge electrode. And a front dielectric layer 15 covering the pair. The rear panel 60 includes a rear substrate 21 made of a transparent body, an address electrode 22 disposed on the rear substrate 21 so as to intersect the sustain discharge electrode pair 12, and a rear dielectric layer covering the address electrode. (25) is provided.

A protective film 16 made of MgO is formed on the back surface of the front dielectric layer 15. The front surface of the rear dielectric layer 25 maintains a discharge distance and prevents electro-optical crosstalk between discharge cells. The partition 30 is formed. Red, green, and blue phosphors 26 are coated on both side surfaces of the barrier rib 30 and the front surface of the rear dielectric layer 25 on which the barrier rib 30 is not formed.

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

In the plasma display panel 10 having such a shape, in order to increase the discharge area, the distance between the X electrode 31 and the Y electrode 32 must be arranged far. This is because when the distance between the X electrode 31 and the Y electrode 32 is far, the discharge space is increased and discharge is actively generated. However, when the distance between the X electrode 31 and the Y electrode 32 increases, there is a problem that power consumption increases because the discharge start voltage increases.

FIG. 2 is a partially cutaway perspective view illustrating the structure of the improved plasma display panel, and FIG. 3 is a cross-sectional view illustrating the unit discharge cell of the plasma display panel shown in FIG. A cross section is shown.

As shown in FIGS. 2 and 3, in the improved plasma display panel, the M electrode 113 is disposed between the X electrode 131 and the Y electrode 132 on the sustain discharge electrode pair 112 disposed on the front panel 150. ) Has been devised. In the case where the M electrode 113 is added, even when the distance between the X electrode 131 and the Y electrode 132 is disposed far, there is an advantage that the power consumption is not high because the discharge start voltage does not increase significantly.

4 is a view illustrating a conventional scanning method in the plasma display panel shown in FIGS. 2 and 3, and FIG. 5 illustrates a luminance step problem when the plasma display panel shown in FIGS. 2 and 3 is applied. FIG. 4 is a diagram schematically illustrating a front surface of a screen of a plasma display panel.

When an image is implemented on the screen by applying a voltage to the address electrode (not shown), the X electrode 131, the M electrode 113, and the Y electrode 132 in the direction indicated by the arrow in FIG. 4, one screen is implemented. When a different screen is implemented afterwards, there is a problem that a luminance step is formed in which the luminance of a portion of the screen is different from the luminance of the other portion. That is, in FIG. 5, when the A part is brightly turned on, and then the A part is turned off again, the B part of the adjacent areas looks brighter than the other parts (A and C parts). That is, the luminance on the screen is uneven and a step is formed. Part B is an area on the screen where a pair of sustain discharge electrodes to which part A has been applied to illuminate part A is located. This phenomenon occurs as the resistance of the panel increases and the sustain discharge voltage during operation also increases in the plasma display panel having the M electrode. When such a luminance step on the screen is formed, the display quality is significantly reduced, so the necessity of taking countermeasures against it is increasing.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel in which a discharge space is enlarged, a discharge start voltage is reduced, discharge efficiency is increased, and an luminance step on the screen is improved.

An object of the present invention as described above, the back substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; Sustain discharge electrode pairs extending across the discharge cells and each having an X electrode and a Y electrode divided into predetermined lengths to divide the entire area of the front substrate into a predetermined number of areas; A first dielectric layer formed to cover the sustain discharge electrode pairs; On the rear surface of the first dielectric layer, disposed between the X electrode and the Y electrode constituting the sustain discharge electrode pair, divided into a predetermined length with respect to the entire length of the front substrate, and extends in parallel with the sustain discharge electrode pairs. M electrodes; A second dielectric layer formed to cover the M electrodes; Address electrodes extending across the discharge cells to intersect the sustain discharge electrode pairs and the M electrodes in each discharge cell; A third dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And a plasma display panel having a discharge gas in the discharge cell.

In this case, the X electrode, the Y electrode, and the M electrode have the same divided lengths, so that the area of the region on the front substrate is substantially the same.

Here, the Y electrode is preferably connected in common between the Y electrodes disposed in each area.

Here, it is preferable that at least one terminal portion connected to the flexible circuit board is formed at a portion where the Y electrodes are commonly connected.

Here, the X electrodes are preferably connected in common between the Y electrodes arranged in each area.

Here, the M electrodes preferably have terminal portions connected to the flexible circuit board, respectively.

In addition, the object of the present invention as described above, the rear substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; M electrodes extending across the discharge cells; A first dielectric layer formed to cover the M electrodes; Sustain discharge electrode pairs each having an X electrode and a Y electrode disposed on both sides of the M electrode and extending in parallel to the M electrode on the rear surface of the first dielectric layer; A second dielectric layer formed to cover the sustain discharge electrode pairs; Address electrodes extending across the discharge cells to intersect the sustain discharge electrode pairs and the M electrodes in each discharge cell; A third dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And a plasma display panel having a discharge gas in the discharge cell.

In this case, the X electrode, the Y electrode, and the M electrode have the same divided lengths, so that the area of the region on the front substrate is substantially the same.

Here, the Y electrode is preferably connected in common between the Y electrodes disposed in each area.

Here, it is preferable that at least one terminal portion connected to the flexible circuit board is formed at a portion where the Y electrodes are commonly connected.

Here, the X electrodes are preferably connected in common between the Y electrodes arranged in each area.

Here, the M electrodes preferably have terminal portions connected to the flexible circuit board, respectively.

Next, specific embodiments of the present invention will be described in more detail with reference to the attached file.

FIG. 5 is a diagram schematically illustrating a configuration of a front panel and a driving unit thereof of the plasma display panel 100 according to the present invention.

As shown in FIG. 5, in the plasma display panel 100 according to the present invention, the X electrode 131, the Y electrode 132, and the M electrode 113 are divided into two regions and disposed on the front panel. The sustain discharge electrode pairs arranged in the right region and the sustain discharge electrode pairs arranged on the left both have the same configuration as the improved plasma display panel 100 using the conventional M electrodes shown in Figs. However, the length in the arranged state is reduced by about half, compared to the conventional one, arranged in two sides, each driven separately.

The panel mentioned in the prior art and the plasma display panel referred to in the present invention are both AC-type plasma display panels that use an AC power source, and are electrically modeled as capacitors because of their capacitive load. Have. Therefore, in the plasma display panel 100 of the present invention configured as described above, the capacity of the capacitor is about half of that of the conventional plasma display panel in which the pair of sustain discharge electrodes are connected to the entire panel for one region driven separately. Is reduced. Thus, each area driven separately has a small capacity as its capacitor, and thus the resistance value is also reduced. When the resistance of the panel is reduced, a small load is applied, so that discharge occurs better even when the same voltage is applied. Therefore, there is an effect of improving the efficiency of the plasma display panel. In addition, since the capacitance as a capacitor of the panel is reduced, a voltage is applied to the X electrode 131, the M electrode 113, and the Y electrode 132 for discharge, and then the voltage is applied even after the voltage is cut off again. 131, the luminance level at which the areas where the M electrodes 113 and the Y electrodes 132 are located appear brighter than other areas is greatly reduced, thereby improving the quality of the image on the screen.

As shown in FIG. 5, the plasma display panel 100 according to the present invention includes two integrated driving boards. The integrated driving board includes a driving circuit capable of simultaneously driving both the X electrode 131, the M electrode 113, and the Y electrode 132, and one integrated driving board includes one drive plate on the plasma display panel 100. Will drive the area. Diagonal arrows shown in FIG. 5 indicate scan directions for respective regions.

Hereinafter, the operation principle and driving method of the plasma display panel having the M electrode to which the present invention is applied will be described.

As shown in FIGS. 2 and 3, the plasma display panel 100 including the M electrode has a large front panel 150 and a rear panel 160, and in detail, a rear substrate 121 and a rear surface thereof. The front substrate 111 spaced apart from and parallel to the substrate 121, the partition wall 130 disposed between the front substrate 111 and the rear substrate 121 and partitioning the discharge cells 170, and the discharge cell. The first dielectric layer 114 extending across the 170 and covering the sustain discharge electrode pairs 112 including the X electrode 131 and the Y electrode 132, and the sustain discharge electrode pairs 112, respectively. ), M electrodes 113 formed on the rear surface of the first dielectric layer 114 and extending in parallel with the sustain discharge electrode pairs 112, and a second dielectric layer formed to cover the M electrodes 113. 115, address electrodes 122 extending across the discharge cells 170 to intersect the sustain discharge electrode pairs 112 and the M electrodes 113 in each discharge cell 170, and the address And a discharge gas in the phosphor layer 126 and, and the discharge cells 170 disposed in the electrode 122, third dielectric layer 115, and discharge cells 170 formed to cover them.

A plurality of sustain discharge electrode pairs 112 are disposed on the front substrate 111. In this case, the front substrate 111 is generally formed of a transparent material mainly made of glass.

The sustain discharge electrode pair 112 refers to a pair of discharge electrodes 131 and 132 formed on the rear surface of the front substrate 111 to cause sustain discharge, and the sustain discharge electrode pair 112 is formed on the front substrate 111. Are arranged in parallel at predetermined intervals. One discharge electrode of the sustain discharge electrode pairs 112 is the X electrode 131, and the other discharge electrode is the Y electrode 132.

Each of the X electrode 131 and the Y electrode 132 includes transparent electrodes 131a and 132a and bus electrodes 131b and 132b. The transparent electrodes 131a and 132a are formed of a transparent material that is a conductor capable of causing a discharge and does not prevent light emitted from the phosphor 126 from advancing to the front substrate 111. Such a material is indium tin (ITO). oxide). However, transparent conductors such as ITO generally have a high resistance, and thus, when the discharge sustaining electrode is formed only by the transparent electrode, a large voltage drop in the longitudinal direction consumes a lot of driving power and a slow response time. In order to improve, the bus electrodes 131b and 132b made of a metal material and formed in a narrow width are disposed on the transparent electrode.

The first dielectric layer 114 is formed on the front substrate 111 provided with the sustain discharge electrode pairs 112 to fill the sustain discharge electrode pairs 112. The first dielectric layer 114 is directly energized between the adjacent X electrode 131 and the Y electrode 132 during sustain-discharge, and positive or negative electrons collide directly with the discharge electrodes 131 and 132 so that the X electrode 131 is discharged. And the Y electrode 132, while preventing damage, are formed of a dielectric material capable of inducing charge and accumulating wall charges. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

The M electrode 113 is disposed between the paired X electrode 131 and the Y electrode 132. The M electrode 113 is formed on the rear surface of the first dielectric layer 114 and extends in one direction to be parallel to the X electrode 131 and the Y electrode 132. The M electrode 113 also includes a transparent electrode 113a and a bus electrode 113b.

In addition, the second dielectric layer 115 is formed to fill the M electrodes 113. The second dielectric layer 115 prevents direct conduction between adjacent X electrodes 131, Y electrodes 132, and M electrodes, and cations or electrons directly collide with the M electrodes 113 to prevent the M electrodes ( 113) to inhibit damage. In addition, the second dielectric layer 115 is formed of a dielectric material capable of inducing charge to accumulate wall charges. Such dielectrics include PbO, B 2 O 3, SiO 2, and the like, using the same dielectric as the first dielectric layer 114. It is preferable to form.

The M electrode 113 is described as being biased in the rear substrate direction than the X electrode 131 and the Y electrode 132, but is not limited thereto. That is, the M electrode 113 may be disposed closer to the front substrate than the X electrode 131 and the Y electrode 132.

The plasma display panel according to the present invention has a small capacitor capacity and a small resistance characteristic for each driving region because the panel is divided into two regions and driven. As a result, the discharge start voltage is lowered, so that discharge is more likely to occur, and the luminance step on the screen during operation is reduced.

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

Claims (12)

Back substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; Sustain discharge electrode pairs extending across the discharge cells and each having an X electrode and a Y electrode divided into predetermined lengths to divide the entire area of the front substrate into a predetermined number of areas; A first dielectric layer formed to cover the sustain discharge electrode pairs; On the rear surface of the first dielectric layer, disposed between the X electrode and the Y electrode constituting the sustain discharge electrode pair, divided into a predetermined length with respect to the entire length of the front substrate, and extends in parallel with the sustain discharge electrode pairs. M electrodes; A second dielectric layer formed to cover the M electrodes; Address electrodes extending across the discharge cells to intersect the sustain discharge electrode pairs and the M electrodes in each discharge cell; A third dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And And a discharge gas in the discharge cell. The method of claim 1, And wherein the X electrode, the Y electrode, and the M electrode have the same divided lengths, so that each divided area of the region on the front substrate is the same. The method of claim 1, And the Y electrodes are commonly connected between Y electrodes disposed in respective regions. The method of claim 2, And at least one terminal portion connected to the flexible circuit board at a portion where the Y electrodes are commonly connected. The method of claim 1, And the X electrodes are connected in common between the Y electrodes arranged in the respective regions. The method of claim 1, And the M electrodes have terminal portions respectively connected to the flexible circuit board. Back substrate; A front substrate spaced apart from and parallel to the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning discharge cells; M electrodes extending across the discharge cells; A first dielectric layer formed to cover the M electrodes; Sustain discharge electrode pairs each having an X electrode and a Y electrode disposed on both sides of the M electrode and extending in parallel to the M electrode on the rear surface of the first dielectric layer; A second dielectric layer formed to cover the sustain discharge electrode pairs; Address electrodes extending across the discharge cells to intersect the sustain discharge electrode pairs and the M electrodes in each discharge cell; A third dielectric layer formed to cover the address electrodes; A phosphor layer disposed in the discharge cells; And And a discharge gas in the discharge cell, And wherein the X electrode, the Y electrode, and the M electrode have the same divided lengths, so that each divided area of the region on the front substrate is the same. delete The method of claim 7, wherein And the Y electrodes are commonly connected between Y electrodes disposed in respective regions. The method of claim 7, wherein And at least one terminal portion connected to the flexible circuit board at a portion where the Y electrodes are commonly connected. The method of claim 7, wherein And the X electrodes are connected in common between the Y electrodes arranged in the respective regions. The method of claim 7, wherein And the M electrodes have terminal portions respectively connected to the flexible circuit board.

Images