KR20050117015A - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel which improves bright room contrast and discharge efficiency.

A plasma display panel according to the present invention comprises: a first substrate and a second substrate facing each other while maintaining a gap; Barrier ribs disposed in a space between the first substrate and the second substrate to form discharge cells; Phosphor layers formed in the discharge cells; Discharge sustain electrodes formed on a first substrate corresponding to each of the discharge cells; And address electrodes formed on the second substrate to intersect the discharge sustain electrodes, wherein the discharge sustain electrodes include first and second electrodes corresponding to each discharge cell, and the first electrode and the second electrode. One of the electrodes is formed of a transparent electrode and a bus electrode, and the other is formed of a bus electrode.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter referred to as PDP) for displaying an image using plasma discharge.

In general, PDP uses red (R), green (G), and blue (B) visible light generated by exciting a phosphor with vacuum ultra-violet (VUV) emitted from plasma obtained through gas discharge. A display device for implementing an image. This PDP can realize a 60-inch or larger screen with a thickness of only 10 cm or less, and is a self-luminous display device such as a cathode ray tube, so that there is no distortion caused by color reproduction and viewing angle, and the manufacturing method is simpler than LCD. It also has strengths in terms of productivity and cost.

The AC PDP forms address electrodes in one direction on the back substrate, covers the address electrodes with a dielectric layer, and has stripe-shaped partition walls between each address electrode on the dielectric layer, and between the partition walls. A phosphor layer of red (R), green (G), and blue (B) color is provided, and discharge sustaining electrodes are provided along a direction crossing the address electrodes on the front substrate facing the rear substrate. The sustain electrodes are formed by covering the dielectric layer and the MgO protective film. Of course, the discharge sustaining electrode is composed of a pair of X and Y electrodes which cause surface discharge, and these X and Y electrodes are usually composed of a transparent electrode which causes surface discharge and a bus electrode which applies a discharge voltage thereto. In addition, these X and Y electrodes may be formed of only a transparent electrode or a bus electrode. A discharge cell is formed at the point where the address electrodes on the rear substrate and the pair of X and Y electrodes on the front substrate cross each other.

Therefore, millions of unit discharge cells are arranged in a matrix form in the PDP, and the discharge cells arranged in the matrix form are simultaneously driven by a driving method using a memory characteristic.

In more detail, in order to generate a discharge between the X electrode and the Y electrode constituting the pair of discharge sustaining electrodes, a potential difference of more than a specific voltage is required, and the voltage at this boundary is called a firing voltage (Vf: Firing Voltage). do. At this time, when the address voltage is applied between the Y electrode and the address electrode, the discharge is initiated to form a plasma in the discharge cell, and the electrons and ions in the plasma move toward the electrode having the opposite polarity, so that a current flows.

On the other hand, a dielectric layer is applied to each electrode of the AC PDP so that most of the transferred space charges are stacked on the dielectric layer having the opposite polarity, so that the net space potential between the Y electrode and the address electrode is originally applied to the address voltage. It becomes smaller than Va, the discharge is weakened, and the address discharge is extinguished. At this time, a relatively small amount of electrons are accumulated on the X electrode side, and a relatively large amount of ions are accumulated on the Y electrode side. The charges accumulated on the dielectric layers covering the X electrode and the Y electrode are accumulated as wall charges (Qw). The space voltage formed between the X and Y electrodes by these wall charges is referred to as wall voltage (Vw).

Subsequently, when a constant voltage (Vs: discharge holding voltage) is applied between the X electrode and the Y electrode, the sum of the magnitudes of the discharge holding voltage Vs and the wall voltage Vw (Vs + Vw) is the discharge starting voltage. If it is higher than (Vf), the discharge occurs in the discharge cell, and the vacuum ultraviolet light (VUV) generated at this time excites the phosphor layer and emits visible light through the transparent front substrate so that the PDP realizes an image.

As described above, the PDP forms the X and Y electrodes of the same material, that is, the X and Y electrodes are formed of a structure having a transparent electrode and a bus electrode, or both the X and Y electrodes are formed of only the bus electrode.

As described above, the PDP having the X and Y electrodes composed of the transparent electrode and the bus electrode has a black stripe for improving the clear room contrast because the contrast of the bright room is not good, and the PDP having the X and Y electrodes consisting of only the bus electrode is provided. Has a problem of lowering the discharge voltage but lowering the aperture ratio to lower the luminescence brightness.

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 which improves bright room contrast and discharge efficiency.

Plasma display panel according to the present invention,

A first substrate and a second substrate facing each other while maintaining a spacing;

Barrier ribs disposed in a space between the first substrate and the second substrate to form discharge cells;

Phosphor layers formed in the discharge cells;

Discharge sustain electrodes formed on a first substrate corresponding to each of the discharge cells; And

Address electrodes formed on the second substrate to cross the discharge sustain electrodes;

The discharge sustain electrode includes a first electrode and a second electrode corresponding to each discharge cell,

One of the first electrode (X electrode) and the second electrode (Y electrode) is formed of a transparent electrode and a bus electrode, and the other is formed of a bus electrode.

In addition, the plasma display panel according to the present invention,

A first substrate and a second substrate facing each other while maintaining a spacing;

Barrier ribs disposed in a space between the first substrate and the second substrate to form discharge cells;

Phosphor layers formed in the discharge cells;

Discharge sustain electrodes formed on the first substrate as first and second electrodes corresponding to the respective discharge cells;

Third electrodes formed side by side between the first electrode and the second electrode; And

Address electrodes formed on the second substrate to cross the discharge sustain electrodes and the third electrodes;

One of the first electrode (X electrode) and the second electrode (Y electrode) is formed of a transparent electrode and a bus electrode, and the other is formed of a bus electrode.

The first electrode and the second electrode are formed in a mutually asymmetric structure.

The first electrode is formed of a transparent electrode and a bus electrode, and the second electrode is formed of a bus electrode.

The transparent electrode of the first electrode extends in a direction crossing the address electrode, and the bus electrode is formed on one side of the transparent electrode.

The bus electrode of the second electrode may be formed of the same material as the bus electrode of the first electrode, and formed on the same layer on the first substrate.

The bus electrode forming the second electrode may include: a first electrode member extending in a direction crossing the address electrode inside each discharge cell;

A second electrode member protruding from the first electrode member to an outer side of the discharge cell; And

And a third electrode member extending in a direction crossing the address electrode while being parallel with the first electrode member at the tip of the second electrode member.

The second electrode member is formed at a corresponding position on the partition wall. In addition, the second electrode member is formed at a position opposite to the address electrode formed to extend. That is, the second electrode member is formed on an imaginary center line extending from the center of the discharge cell to one side. The third electrode is formed in the non-discharge region of the discharge cell.

The bus electrode forming the second electrode may include: a first electrode member extending in a direction crossing the stretching direction of the address electrode at the center of each discharge cell;

A second electrode member protruding from the first electrode member toward the outside of the discharge cell; And

And a third electrode member protruding from the second electrode member in the extending direction of the first electrode member, wherein the third electrode member is formed independently of each discharge cell.

The third electrode member is formed in plural and convex toward the center of the discharge cell.

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

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

Referring to this figure, the PDP is schematically described. The PDP seals the first substrate (1, hereinafter referred to as front substrate) and the second substrate (3, hereinafter referred to as back substrate) to face each other. It is formed by filling an inert gas between the front substrate 1 and the back substrate 3. In the space formed between the front substrate 1 and the back substrate 3, a plurality of partition walls 5 are arranged to partition the plurality of discharge cells 7R, 7G, and 7B. The discharge cells 7R, 7G, and 7B form fluorescent layers 8R, 8G, and 8B made of phosphors of red (R), green (G), and blue (B) colors applied therein.

Discharge sustaining electrodes 9 and 11 extend in one direction (x-axis direction in the drawing) on the front substrate 1, and the discharge sustaining electrodes 9 and 11 are discharge cells 7R, in the y-axis direction. 7G, 7B). The address electrodes 13 are formed on the rear substrate 3 in a direction intersecting the discharge sustaining electrodes 9 and 11 (y-axis direction in the drawing), and the address electrodes 13 are formed on the rear substrate 3. It is arranged at intervals corresponding to each of the discharge cells 7R, 7G, and 7B in the x axis direction. That is, the discharge sustaining electrodes 9 and 11 and the address electrodes 13 are arranged to cross each other in correspondence with the discharge cells 7R, 7G and 7B. Discharge cells 7R, 7G, and 7B are formed at portions where the discharge sustaining electrodes 9, 11 and the address electrodes 13 intersect.

The partition walls 5 provided between the front substrate 1 and the rear substrate 3 are parallel to each other while maintaining a distance corresponding to the other partition walls 5 and the discharge cells 7R, 7G, and 7B that are adjacent to each other. Disposed, the discharge cells 7R, 7G, and 7B necessary for plasma discharge are partitioned in the space between the front substrate 1 and the back substrate 3. This embodiment illustrates a stripe-type barrier rib structure formed only of barrier ribs 5 arranged in parallel with the address electrodes 13 (y axis direction).

In addition, the barrier rib structure of the present invention is not limited to the above-described stripe barrier rib structure, and the barrier ribs 5 formed in the direction parallel to the address electrodes 13 (y-axis direction) and the barrier ribs 5 intersect with the barrier ribs 5. It includes a closed partition structure for partitioning the discharge cells (7R, 7G, 7B) independently by partitions (not shown) formed in the direction (x axis direction). In addition, the barrier rib structure of the present invention includes a closed barrier rib structure for forming the discharge cells 7R, 7G, and 7B in a quadrangular shape, and a closed barrier rib structure for forming hexagonal and octagonal shapes.

The discharge sustaining electrodes 9 and 11 are formed of first and second electrodes 9, 11, hereinafter referred to as X and Y electrodes corresponding to both sides of one discharge cell 7R, 7G, and 7B. It is formed on the substrate 1.

In the present invention, the X and Y electrodes 9 and 11 are formed in different structures, that is, asymmetrical structures, and are formed of different materials. That is, the X electrode 9 is formed of the transparent electrode 9a and the bus electrode 9b, and the Y electrode 11 is formed of the bus electrode. The X electrode 9 may be formed of a bus electrode, and the Y electrode 11 may be formed of a transparent electrode and a bus electrode.

First, the X electrode 9 will be described. The transparent electrode 9a is formed in a stripe shape in a direction crossing the address electrode 13 (x-axis direction), and discharge cells 7R, 7G, and 7B are formed. It may be formed of a structure (not shown) having a large area in the center of. In addition, since the transparent electrode 9a is a part which causes surface discharge inside the discharge cells 7R, 7G, and 7B, it blocks a considerable area of the discharge cells 7R, 7G, and 7B, thereby minimizing the blocking of visible light and emitting light. It may be formed of a transparent material to ensure luminance, and may be formed of an indium tin oxide (ITO) electrode.

In addition, the bus electrode 9b of the X electrode 9 is made of a metal material having excellent electrical conductivity by compensating for the high electrical resistance of the transparent electrode 9a to ensure the electrical conductivity of the transparent electrode 9a. It is preferable to be formed, and may be formed of an aluminum (Al) electrode. The bus electrode 9a is formed in a stacked structure on one side of the transparent electrode 9a formed on the front substrate 1 and extends in a direction crossing the address electrode 13 (x-axis direction). Since the bus electrode 9b is made of an opaque material, the bus electrode 9b is disposed to correspond to the partition wall 5, and is formed to have a width smaller than that of the partition wall 5 to block the visible light emitted from the discharge cells 7R, 7G, and 7B. It is desirable to minimize it.

The Y electrode 11 opposite to the X electrode 9 is formed of a bus electrode as described above. Therefore, the Y electrode 11 has good electrical conductance, thereby reducing the discharge start voltage, thereby reducing the driving power consumption of the PDP, and improving the clear room contrast by the black layer of the bus electrode composed of the black layer and the white layer.

2 is a cross-sectional view taken along the line A-A of FIG.

Referring to the drawing, the Y electrode 11 formed of the bus electrode will be described. The Y electrode 11 is formed of the same material as the bus electrode 9b of the X electrode 9, and the bus electrode 9b. It is good to be formed in the same layer. The structure formed on the same material and the same layer as described above allows the bus electrode 9b and the Y electrode 11 of the X electrode 9 to be formed on the first substrate 1 in one process, thereby manufacturing the PDP. Simplify the process Of course, after the transparent electrode 9a is formed, the dielectric layer 15 is formed to correspond to the thickness of the transparent electrode 9a to match the height of the positions where the bus electrode 9b and the Y electrode 11 are to be formed. In this state, it is preferable to form the bus electrode 9b and the Y electrode 11.

3 is a partial plan view of FIG. 1.

Referring to the drawing, the Y electrode 11 will be described further. The Y electrode 11 made of the bus electrode is formed in a structure including the first, second, and second electrode members 11a, 11b, and 11c. .

The first electrode member 11a is formed to extend in the direction crossing the address electrode 13 at the center of each discharge cell 7R, 7G, 7B. In other words, the first electrode member 11a extends along the address electrode 13 at the center of the discharge cells 7R, 7G, and 7B to form the discharge gap g with the transparent electrode 9a of the X electrode 9. It is formed at a position slightly biased to the outside of the discharge cells 7R, 7G, and 7B.

The second electrode member 11b protrudes from the first electrode member 11a to the outer side of the discharge cells 7R, 7G, and 7B. The second electrode member 11b electrically connects the first and third electrode members 11a and 11c to each other. The second electrode member 11b is preferably formed at a corresponding position on the partition wall 5, which is a non-discharge area, in order to minimize blocking of visible light emitted from the discharge cells 7R, 7G, and 7B and to improve emission luminance. Do.

The third electrode member 11c is formed to extend in a direction crossing the address electrode 13 while being parallel to the first electrode member 11a at the tip of the second electrode member 11b. This third electrode member 11c is preferably provided on the outer side of the discharge cells 7R, 7G, 7B. In other words, the third electrode member 11c is provided in the non-discharge region of the discharge cells 7R, 7G, and 7B.

The discharge sustaining electrodes 9 and 11, that is, the X and Y electrodes 9 and 11 formed as described above, have a stacked structure of the dielectric layer 15 and the MgO passivation layer 17 in order to accumulate wall charges during PDP driving. Covered with The dielectric layer 15 is preferably formed of a transparent dielectric so as to improve the transmittance of visible light. The MgO protective film 17 prevents ions of the ionized atoms from colliding with the dielectric layer 15 and damaging the dielectric layer 15, and improves the emission of secondary electrons when the ions collide.

The address electrodes 13 scan-driven in interaction with the Y electrode 11 are covered with the dielectric layer 19 to form wall charges in the discharge cells 7R, 7G, and 7B to cause address discharge. The partitions 5 described above are formed on the dielectric layer 19.

4 is a partial plan view of a plasma display panel according to a second embodiment of the present invention.

The second embodiment will be described with reference to the drawings. The overall configuration and operation of this second embodiment are similar to or the same as those of the first embodiment, so that the first and second embodiments will be compared here, and thus the structure of the first embodiment will be described. The configuration of the second embodiment which is different from that will be described.

The second electrode member 11b of the second embodiment is formed at a position opposite to the address electrode 13, while the second electrode member 11b of the first embodiment is formed at a position corresponding to the partition wall 5. do. That is, the second electrode member 11b of the second embodiment is formed on an imaginary center line extending from the center of the discharge cells 7R, 7G, 7B to one side of the discharge cells 7R, 7G, 7B.

Accordingly, in the second embodiment, the opposing range of the second electrode member 11b of the Y electrode 11 and the address electrode 13 is long, so that a scan pulse is applied to the Y electrode 11 and the address electrode 13 is applied. The address discharge can be more surely performed in the scan period in which the address voltage is applied.

5 is a partial plan view of a plasma display panel according to a third embodiment of the present invention.

The third embodiment will be described with reference to the drawings. The overall configuration and operation of this third embodiment are similar to or the same as those of the second embodiment, and thus, the second and third embodiments will be compared, and thus the structure of the second embodiment will be described. The configuration of the third embodiment is different from that of the following.

The Y electrode 11 of the third embodiment removes the third electrode member 11c of the configuration of the Y electrode 11 of the second embodiment, and the third electrode member 11c is attached to the second electrode member 11b in this state. It is formed into a structure having further).

The third electrode member 11c of the third embodiment is formed to protrude in the extending direction of the first electrode member 11a on the second electrode member 11b, and is independent of each discharge cell 7R, 7G, 7B. Is formed. That is, the third electrode member 11c of the third embodiment is not formed to extend continuously to the neighboring discharge cells 7R, 7G, and 7B, but protrudes only in one discharge cell 7R, 7G, and 7B. The third electrode member 11c may be formed on the second electrode member 11b as one, but within the allowable emission luminance range, two or more third electrode members 11c may be formed. It may be. The third electrode member 11c formed in plural forms the sustained discharge by acting with the X electrode 9 to pass visible light therebetween to maintain the required light emission luminance. In addition, the third electrode member 11c may be formed convexly toward the center of the discharge cells 7R, 7G, and 7B. That is, the third electrode member 11c may be deformed into various shapes in the discharge cells 7R, 7G, and 7B.

6 is a partial plan view of a plasma display panel according to a fourth embodiment of the present invention.

Referring to the fourth embodiment, the fourth embodiment may correspond to the first to third embodiments described above, and only those corresponding to the first embodiment are shown and described herein. That is, the present invention also applies to a PDP having X and Y electrodes 9 and 11 and an address electrode 13 and a PDP having X and Y electrodes 9 and 11, an address electrode 13 and an M electrode 21. It means that the same can be applied.

Since the overall configuration and operation of this fourth embodiment are similar to or the same as those of the first embodiment, the structure of the first embodiment is different from that of the first embodiment by comparing the first and fourth embodiments.

That is, the fourth embodiment further includes a third electrode 21 (hereinafter referred to as M electrode) as compared with the configuration of the first embodiment. The M electrode 21 is formed to extend on the front substrate 1 in parallel to the X electrode 9 and the Y electrode 11 in correspondence with each discharge cell 7R, 7G, 7B. In addition, the M electrode 21 may be formed in a structure composed of the transparent electrode 9a and the bus electrode 9b or a Y electrode 11 composed only of the bus electrode, like the X electrode 9 described above.

The X electrode 9 and the Y electrode 11 mainly serve as an electrode for applying a voltage necessary for sustain discharge, while the M electrode 21 mainly applies a reset waveform and a scan pulse voltage. It serves as an electrode for. However, the role of the surface discharge electrodes including the X electrode 9, the Y electrode 11, and the M electrode 21 may be different depending on the voltage waveform applied to each electrode, but is not necessarily limited thereto. .

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, among the X and Y electrodes forming the discharge sustaining electrode, the X electrode is formed as a transparent electrode and a bus electrode, and the Y electrode is formed as a bus electrode, thereby providing good conductance. It is possible to reduce the power consumption by improving the discharge voltage at low voltage by the Y electrode which is made of the light, improve the clear room contrast, and improve the aperture ratio by the X electrode adopting the transparent electrode and the bus electrode which have good transmittance of visible light. There is an effect of improving the discharge efficiency.

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

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a partial plan view of FIG. 1.

4 is a partial plan view of a plasma display panel according to a second embodiment of the present invention.

5 is a partial plan view of a plasma display panel according to a third embodiment of the present invention.

6 is a partial plan view of a plasma display panel according to a fourth embodiment of the present invention.

Claims (16)

A first substrate and a second substrate facing each other while maintaining a spacing; Barrier ribs disposed in a space between the first substrate and the second substrate to form discharge cells; Phosphor layers formed in the discharge cells; Discharge sustain electrodes formed on a first substrate corresponding to each of the discharge cells; And Address electrodes formed on the second substrate to cross the discharge sustain electrodes; The discharge sustain electrode includes a first electrode and a second electrode corresponding to each discharge cell, One of the first electrode and the second electrode is formed of a transparent electrode and a bus electrode, and the other is a plasma display panel. The method of claim 1, And the first electrode and the second electrode are formed in an asymmetrical structure. The method of claim 1, And the first electrode is formed of a transparent electrode and a bus electrode, and the second electrode is formed of a bus electrode. The method of claim 3, wherein And a transparent electrode of the first electrode extending in a direction crossing the address electrode, and a bus electrode of the first electrode formed on one side of the transparent electrode. The method of claim 3, wherein The bus electrode of the second electrode is formed of the same material as the bus electrode of the first electrode. The method of claim 3, wherein And the bus electrode of the second electrode is formed on the same substrate as the bus electrode of the first electrode. The method of claim 1, The bus electrode forming the second electrode may include a first electrode member extending in a direction crossing the address electrode at the center of each discharge cell; A second electrode member protruding from the first electrode member to an outer side of the discharge cell; And And a third electrode member extending from the distal end of the second electrode member in parallel with the first electrode member and extending in a direction crossing the address electrode. The method of claim 7, wherein And the second electrode member is formed at a corresponding position on the partition wall. The method of claim 7, wherein And the second electrode member is formed at a position opposite to the address electrode formed to extend. The method of claim 7, wherein The second electrode member is formed on a virtual center line extending from the center of the discharge cell to one side. The method of claim 7, wherein And the third electrode is formed in the non-discharge area of the discharge cell. The method of claim 1, The bus electrode forming the second electrode may include: a first electrode member extending in a direction crossing the stretching direction of the address electrode at the center of each discharge cell; A second electrode member protruding from the first electrode member toward the outside of the discharge cell; And A third electrode member protruding from the second electrode member in a direction in which the first electrode member extends; And the third electrode member is formed independently of each discharge cell. The method of claim 12, And a plurality of third electrode members. The method of claim 12, And the third electrode member is formed convexly toward the center of the discharge cell. A first substrate and a second substrate facing each other while maintaining a spacing; Barrier ribs disposed in a space between the first substrate and the second substrate to form discharge cells; Phosphor layers formed in the discharge cells; Discharge sustain electrodes formed on the first substrate as first and second electrodes corresponding to the respective discharge cells; Third electrodes formed side by side between the first electrode and the second electrode; And Address electrodes formed on the second substrate to cross the discharge sustain electrodes and the third electrodes; One of the first electrode and the second electrode is formed of a transparent electrode and a bus electrode, and the other is a plasma display panel. The method of claim 15, The bus electrode forming the second electrode may include a first electrode member extending in a direction crossing the address electrode at the center of each discharge cell; A second electrode member protruding from the first electrode member to an outer side of the discharge cell; And And a third electrode member extending from the distal end of the second electrode member in parallel with the first electrode member and extending in a direction crossing the address electrode.