KR100786837B1 - Plasma display panel - Google Patents

Abstract

The PDP of the present invention is a plasma display panel which displays an image by gas discharge using a plurality of discharge cells provided with a pair of display electrodes facing each other between a first substrate and a second substrate that are disposed to face each other. At least one of the display electrodes includes two or more line parts spaced apart from each other by a predetermined interval, a connection part connecting the two or more line parts to each other, and a reinforcement part near an intersection where the line part and the connection part meet.

Plasma, Display, Line, Reinforcement, Disconnection, Dissipation

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 cross-sectional view of the plasma display panel cut along the line A-A of FIG.

3 is an electrode layout diagram illustrating an electrode structure of the plasma display panel illustrated in FIG. 1 together with a partition wall.

4 is a perspective view showing a state of a display electrode according to an exemplary embodiment of the present invention.

5 is an electrode layout view showing an electrode structure according to another embodiment of the present invention.

6 is a diagram illustrating a distribution of luminance of one discharge cell in a plasma display panel.

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 in which an electrode structure is improved to improve light emission luminance.

In general, a plasma display panel (PDP) is a display device that realizes an image by using visible light generated by excitation of a phosphor by vacuum ultraviolet (VUV) radiation emitted from a plasma obtained through gas discharge. to be. Such a PDP can realize a super-large screen of 60 inches or more in a thickness of only 10 cm, and has a characteristic of excellent color reproduction and no distortion due to a viewing angle because it is a self-luminous display device such as a CRT. In addition, the manufacturing method is simpler than LCD, and thus has advantages in terms of productivity and cost.

The structure of the PDP has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. The three-electrode surface discharge type structure consists of one substrate including a display electrode located on the same surface and another substrate including an address electrode vertically spaced apart from the substrate and having a discharge gas interposed therebetween. to be. In general, the presence or absence of the discharge is determined by the discharge of the address electrode facing the scan electrode independently connected to each line, and the sustain discharge indicating the luminance is performed by two electrode groups located on the same plane. .

In this case, in order not to block light emitted from the substrate, the display electrode is generally formed of a transparent electrode. However, since the transparent electrode itself has a high resistance, in order to compensate for its conductivity, the metal electrode is combined with the transparent electrode to form a sustain electrode.

In this case, the transparent electrode is made of a material such as indium tin oxide (ITO) or SnO _2, and the metal electrode is a thin film made of three layers of Ag, Cr / Cu / Cr, or a thin film made of a two-layer structure of Al / Cr. do.

Such a conventional electrode structure forms a metal electrode on a substrate by a photo etching method or a liftoff method, and a transparent electrode is then etched or liftoff by a next process. To form.

Therefore, there is a disadvantage that the work process is very complicated, thereby increasing the manufacturing cost of the panel. In addition, since the transparent electrode itself is expensive, this also increases the manufacturing cost.

Therefore, efforts are being made to form the storage electrode only with the metal electrode without using the transparent electrode, and one of the related arts includes a "plasma display panel" disclosed in US Pat. No. 6,522,072.

According to this, there is an advantage that the manufacturing cost can be lowered as compared with the electrode structure described above. However, the sustain electrode formed of only the metal electrode has a problem of lowering the aperture ratio of the panel and decreasing luminance.

As an alternative to solving this problem, it is possible to consider a method of increasing the distance between the two metal electrodes positioned with the discharge gap in between. However, this increases the discharge voltage and causes the discharge to become unstable. This is required.

Meanwhile, FIG. 6 is a diagram illustrating a distribution of luminance of one discharge cell in the PDP. As shown in FIG.

In the drawing, only the display electrode 101 and the partition wall 201 are selectively illustrated, and a graph showing the luminance distribution according to the electrode is shown vertically based on the drawing by extending the display electrode, and the luminance distribution along the partition is shown horizontally. It was. According to this, the closer to the partition wall, the higher the brightness, which is due to the large amount of phosphor coated on the wall of the partition wall. . In addition, the closer the discharge gap W is, the higher the luminance appears, because the intensity of the discharge is the largest in this portion.

The present invention has been devised to solve the above-described problems, and provides a plasma display panel of the present invention in which the aperture ratio of a discharge cell is expanded using only a metal electrode and the emission luminance is improved.

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

A plasma display panel for displaying an image by gas discharge using a plurality of discharge cells including a pair of display electrodes facing each other between a first substrate and a second substrate disposed to face each other, wherein at least one of the display electrodes is displayed. One includes two or more line portions spaced apart from each other by a predetermined interval, a connecting portion connecting the two or more line portions to each other, and a reinforcement portion near an intersection where the line portion and the connecting portion meet.

In the present invention, the display electrode may include a first line part positioned at both ends of the discharge cell, and a second line part spaced apart from the first line part to face each other in the discharge cell to form a discharge gap. .

In addition, the line width of the line portion and the connection portion in the present invention may be made different, wherein the line width of the line portion is formed thinner than the line width of the connection portion.

The present invention may further include a third line part positioned between the first line part and the second line part, wherein a reinforcement part is further provided along an intersection point of the third line part and the connection part. In addition, the third line portion may be located adjacent to the first line portion relatively to the second line portion.

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.

FIG. 1 is a partially exploded perspective view illustrating a plasma display panel according to an embodiment of the present invention, and FIG. 2 is a partially combined cross-sectional view of the A-A line of FIG. 1.

As shown, in the PDP of the present embodiment, the first substrate 10 (hereinafter referred to as 'back substrate') and the second substrate 20 (hereinafter referred to as 'front substrate') are disposed to face each other at predetermined intervals. Color spaced discharge cells 18R, 18G, and 18B formed by the partition wall 16 are provided in the space between the substrates 10 and 20. In the discharge cell 18, a fluorescent layer 19, which is excited by ultraviolet rays and emits visible light, is formed along the partition surface 161 and the bottom surface 141, and discharge gas (for example, to generate plasma discharge). Mixed gas containing xenon (Xe), neon (Ne), and the like.

The front substrate 20 is formed of a transparent material such as glass through which visible light can be transmitted so that an image is displayed. In the lower surface 201 of the front substrate 20, display electrodes 25 are formed to correspond to each discharge cell 18 in one direction (the x-axis direction of the drawing). These display electrodes 25 are composed of a scanning electrode 21 and a sustain electrode 23 in their functional operation. The scan electrode 21 selects a discharge cell that is turned on by working with the address electrode 12, and the sustain electrode 23 works with the scan electrode 21 to generate sustain discharge for the selected discharge cell. Formally, the display electrode 25 is formed in a thin bar shape to form an empty space therein. The display electrode 25 will be described in detail later.

The display electrodes 25 are embedded and covered by a dielectric layer 28 formed of a dielectric such as PbO, B ₂ O ₃ , SiO _2, and the like. It prevents damage to the display electrodes 25 by directly colliding with and serves to induce charged particles.

The lower surface 281 of the dielectric layer 28 may be covered by a protective film 29 formed of MgO or the like. The protective film 29 may be charged when the charged particles collide directly with the dielectric layer 28 during discharge. 28) and damage the charged particles can be discharged secondary electrons can play a role in improving the discharge efficiency.

In addition, the upper surface 101 of the rear substrate 10 facing the front substrate 20 extends in the direction in which the address electrodes 12 intersect the display electrodes 25 (y-axis direction in the drawing), and are spaced apart from each other. In this state, the discharge cells are arranged in a form corresponding to each discharge cell. The address electrodes 12 are covered with a dielectric layer 14 and embedded therein, and the partition wall 16 is formed in a predetermined pattern on the dielectric layer 14.

The partition wall 16 divides the discharge cells 18, which are discharge spaces in which discharge is performed, to prevent cross talk between adjacent discharge cells 18. As shown, the partition 16 is mutually spaced apart from each other in a direction intersecting the vertical partitions 16a on the same plane as the vertical partitions 16a and the vertical partitions 16a. The horizontal partition walls 16b extending apart from each other define the discharge cells 18 having a closed structure. In the present embodiment, such a barrier rib structure is described as a preferred form, and thus, a barrier rib structure having various shapes such as a stripe-type barrier rib structure formed in parallel with the address electrode 12 while being located between the address electrodes 12 is also possible. Of course.

In the discharge cells 18, a fluorescent layer 19 that emits visible light by being excited by ultraviolet rays generated during discharge is formed. The fluorescent layer 19 is formed over the wall surface 161 of the partition wall 16 and the lower surface 141 of the dielectric layer 14 defined by the partition wall 16 as shown. The phosphor layer 19 may be formed by selecting any one of red, green, and blue phosphors for color expression, and thus divided into red, green, and blue phosphor layers 18R, 18G, and 18B. Can be. As described above, a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed is filled in the discharge cells 18 in which the phosphor layer 19 is disposed.

Hereinafter, the electrode structure according to the present embodiment will be described. The display electrode 25 of the present embodiment has a non-transparent electrode structure composed of only metal electrodes without using transparent electrodes.

3 is a partial plan view selectively showing the structure of an electrode and a discharge cell in the plasma display panel shown in FIG. In FIG. 3, only the electrode and the discharge cell are selectively shown, and the address electrode is not shown. 4 is a perspective view illustrating a scan electrode constituting the display electrode.

Referring to the drawings, the display electrode 25 of the present embodiment is disposed between the pair of first line portions 211 and 231 facing the discharge cells and positioned in parallel with each other, and between the first line portions 211 and 231. And second line portions 212 and 232 positioned to face each other inside the discharge cell to form a discharge gap G.

In this case, the first line portions 211 and 231 are positioned inside the discharge cell 18 adjacent to the horizontal partition wall 16b that divides the discharge cells 18 among the partition walls 16. Accordingly, the phosphor layer 19 formed as the wall surface of the horizontal partition wall 16b is excited under the influence of the electric field formed by the first line portions 211 and 231 to emit visible light. Experimentally, the first line portions 211 and 231 are preferably located between 10 and 20 micrometers from the phosphor layer 19. If the distance is smaller than this distance, there is a problem that visible light is blocked due to insufficient space for emitting visible light. If the distance is larger than this distance, the distance between the phosphor layer 19 and the first line portions 211 and 231 is too far, and the phosphor is too far. There is a disadvantage that does not excite.

The second line portions 212 and 232 are formed to cross the center of the discharge cell 18 while forming an empty space S therebetween at a predetermined distance from the first line portions 211 and 231. (In the x-axis direction of the drawing). Substantially, the first line parts 211 and 231 and the second line parts 212 and 232 are formed to extend in a direction crossing the address electrode 12 (x-axis direction in the drawing) in parallel with each other.

Accordingly, a pair of adjacent second line portions 212 and 232 facing the center of the discharge cell face each other inside the discharge cell 18 to form a discharge gap G, and an electrical signal applied to each electrode. As a result, counter discharge at the initial stage of discharge is formed.

The initial counter discharge started around the discharge gap G is induced between the first line portions 211 and 231 as a surface discharge. At this time, if the distance between the first line portion 211 and 231 and the second line portion 212 and 232 becomes too wide, the discharge is not diffused and thus an appropriate distance should be maintained, which is dependent on various factors involved in plasma discharge. Although it cannot be determined, it is desirable to maintain about 130 (μm) microns within the general driving range.

In the present embodiment, the first line portions 211 and 231 and the second line portions 212 and 232 constituting the scan electrodes 21 and the sustain electrodes 23 are connected to the inside of the discharge cells 213 and 233. Are connected to each other by

In this case, the connecting portions 213 and 233 are positioned along the center line of the discharge cell 18 along the longitudinal axis (y-axis direction of the drawing) so that the distribution of discharges can be geometrically uniform for the entire discharge cell. The ends thereof are connected to the second line portions 212 and 232 and extend to the first line portions 211 and 231 in parallel with the vertical bulkhead 16a to be in contact with each other.

As such, since the first line portions 211 and 231 and the second line portions 212 and 232 spaced apart from each other are connected to each other by the connecting portions 213 and 233, the wall charges generated during the discharge process are connected to the connecting portions ( The opposite discharge formed at the discharge gap G between the second line portions 213 and 232 while traveling along the lines 213 and 233 extends to the first line portions 211 and 231 to facilitate surface discharge with a long discharge path. It acts to form.

On the other hand, since the connecting portions 213 and 233 are located at the center of the discharge cell, they are directly related to the opening ratio of the discharge cell. Therefore, the connection parts 213 and 233 are produced by making the line width relatively thinner than the 1st and 2nd line parts.

The reinforcement parts 21a and 23a are further provided along the intersection point P where the first and second line parts and the connection parts 213 and 233 meet. These reinforcement parts 21a and 23a are formed in the shape which enlarges the partial area of an intersection, It is preferable that the outer periphery is rounded. The reinforcing parts 21a and 23a serve to prevent the disconnection or splitting of each other due to the shrinkage difference when the line part and the connecting part having different line widths are fired.

On the other hand, at the end portions of the second line portions 212 and 232 that form the discharge gap G, recesses 21c and 23c having a groove shape curved with a predetermined curvature are formed. Accordingly, the long gap G2 is formed with the recesses 21c and 23c interposed therebetween, and the short gap G1 is shorter than the long gap G2 between the end regions where the recess is not formed. .

As described above, recesses 21c and 23c are formed in the first bus electrodes 211 and 231, respectively, so that the discharge gap G includes the long gap G2 and the short gap G1. In the discharge mechanism that starts at and spreads to the long gap G1 and spreads to the entire discharge cell 18, the discharges can be stably formed by concentrating the discharges in the centers of the recesses 21c and 23c constituting the long gap G2. In addition, the end regions other than the recesses forming the short gap G2 may increase the discharge efficiency by lowering the discharge start voltage.

The concave portions 21c and 23c are positioned along the intersection point P where the connecting portions 213 and 233 meet the second line portions 212 and 232 so that diffusion can easily occur from the long gap G2 to surface discharge. It is desirable to.

On the other hand, between the first line portions 211 and 231 and the second line portions 212 and 232 of the scan electrode 21 and the sustain electrode 23 are substantially empty, respectively, As a result, the electric field is distorted, and thus the opposite discharge generated around the discharge gap G may not be easily diffused due to the surface discharge between the first line portions 211 and 231. In another embodiment of the present invention, the third line part 214 and 234 may be further formed between the first line part 211 and 231 and the second line part 212 and 232. The third line portions 214 and 234 are located closer to the first line portions 211 and 231 than the second line portions 212 and 232. Accordingly, as shown in FIG. Discharge diffusion can be easily achieved without covering the high light emission luminance around the gap (see FIG. 5).

Thus, the scan electrode 21 and sustain electrode 23 having the metal bus electrode combination are formed in the above-described structure along each discharge cell, and are also connected to the driver for transmitting a drive signal to the PDP. Accordingly, each line part supplies a voltage applied from the driver to each discharge cell.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the present invention, the above-mentioned problem is solved, so that the electrodes are partially formed in the empty space, so that the aperture ratio of the panel is improved compared to the prior art, thereby increasing the light emission luminance. Furthermore, since light generated on the wall surface of the partition wall with good light emission brightness is not blocked, light emission brightness higher than before can be exhibited. Since each line part is connected to the connection part, the discharge path is extended, so that the distribution of the discharge is uniform throughout the discharge cell. In addition, since the reinforcement part is provided along the intersection, the problem of disconnection and loss due to heat shrinkage during the firing process of the electrode can be solved.

Claims (9)

A first substrate; A second substrate disposed to face the first substrate; A partition wall partitioning a space between the first substrate and the second substrate to form a discharge cell; A pair of display electrodes facing each other in the discharge cell; A dielectric layer covering the display electrode; And, An address electrode formed to intersect the display electrode; Including, At least one of the display electrodes, First line portions positioned at both ends of the discharge cell; A second line part spaced apart from the first line part so as to face each other inside the discharge cell to form a discharge gap; A connection part connecting the first line part and the second line part; An expanded reinforcement part having an intersection point where the line parts and the connection part meet, And the line parts are formed of a metal bus electrode. delete The method of claim 1, And a line width of the first and second line parts and the connection part are different from each other. The method of claim 3, And a line width of the connection portion is thinner than a line width of the first or second line portion. The method of claim 1, And a concave portion forming a long gap and a short gap along a point where the second line portion meets the connection portion. The method of claim 1, Further comprising a third line portion located between the first line portion and the second line portion, And a reinforcing part provided along an intersection point of the third line part and the connecting part. The method of claim 6, And the third line portion is located adjacent to the first line portion rather than the second line portion. delete The method of claim 1, And the line parts are spaced apart from each other in parallel to extend in one direction.

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