KR100658748B1 - Plasma display panel - Google Patents

Abstract

In the PDP of the present invention, in the plasma display panel displaying an image by gas discharge using a plurality of discharge cells provided with a pair of display electrodes facing each other between the first substrate and the second substrate disposed opposite to each other, Each electrode is formed by a combination of a transparent electrode facing each other to form a discharge gap and a bus electrode that complements the conductivity of the transparent electrode, and the bus electrode is formed as an end of the transparent electrode far from the discharge gap. And a second bus electrode formed along an end portion of the transparent electrode spaced apart from the first bus electrode and forming a discharge gap.

Plasma, Display, Panel, Discharge Gap, Bus Electrode, Diffusion

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.

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

FIG. 3 is an electrode layout view selectively showing electrodes and partition walls in the plasma display panel of FIG. 1.

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

5 is an electrode layout view of a display electrode according to another exemplary embodiment of the present invention.

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 improved luminance by improving an electrode structure.

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 a vacuum ultraviolet ray (VUV) emitted from a plasma obtained through gas discharge. to be.

Such a PDP can realize an ultra-large screen of 60 inches or more within a thickness of only 10 cm, and has a characteristic of excellent color reproducibility and less 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 the liquid crystal display, and thus has advantages in terms of productivity and cost, and thus has been in the spotlight as the next-generation industrial flat panel display and home TV display.

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.

The presence or absence of the discharge is determined by the discharge of the address electrode which is connected to each line and is independently controlled by the scan electrode, and the sustain discharge indicating the luminance is the two electrode groups of the scan electrode and the sustain electrode located on the same plane. Made by (iii).

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 high resistance, in order to compensate for its conductivity, the metal electrode is combined with the transparent electrode to form the display electrode.

Nevertheless, there is a problem that the discharge start voltage is high because the transparent electrodes substantially face each other inside the discharge cell to form a discharge gap which causes initial counter discharge. In addition, it is preferable that the opposite discharge started around the discharge gap is diffused into the surface discharge directed to both ends of the discharge cell. Since the conductivity of the transparent electrode is not good, the electric field formed at the end of the electrode in the discharge gap is weak and discharge diffusion is prevented. There is a problem that does not happen well.

The present invention has been devised to solve the above problems in view of the above, and has an object of improving the electrode structure so that stable discharge can occur.

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

A plasma display panel for displaying an image by gas discharge using a plurality of discharge cells having a pair of display electrodes facing each other between a first substrate and a second substrate disposed opposite to each other, wherein the display electrodes are mutually A first bus electrode formed of a combination of a transparent electrode facing each other and forming a discharge gap and a bus electrode that complements the conductivity of the transparent electrode, and the bus electrode being formed as an end of the transparent electrode far from the discharge gap And a second bus electrode formed along an end portion of the transparent electrode spaced apart from the first bus electrode and forming a discharge gap.

In the present invention, the transparent electrode may be formed of a protruding electrode provided along each discharge cell, and a recess may be formed at an end of the protruding electrode to form a long gap and a short gap.

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 phosphor 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. The display electrode 25 will be described in detail later.

The display electrodes 25 are covered by a dielectric layer 28 formed of a dielectric such as PbO, B ₂ O ₃ , SiO _2, and the like, and the dielectric layer 28 is filled with charged particles during discharge. 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. ), And when charged particles collide with each other, the secondary electrons may be discharged to increase 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 buried 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 positioned between the address electrodes 12 is 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. This fluorescent layer 19 is formed over the wall surface of the partition wall 16 and the lower surface of the dielectric layer 14 defined by the partition wall 16 as shown. The fluorescent layer 19 may be selected and formed as 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), or the like is mixed is filled in the discharge cells 18 in which the fluorescent layer 19 is disposed.

Hereinafter, an electrode structure according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a layout plan view of an electrode selectively showing only a display electrode and a partition wall in FIG. 1, and FIG. 4 is a bottom perspective view illustrating a display electrode.

In the present invention, each of the scan electrode 21 and the sustain electrode 23 is formed of the transparent electrode 251 and the first bus electrode 253 and the second bus electrode 255 that complement the conductivity of the transparent electrode 251. In combination. In this case, since the scan electrode and the sustain electrode are formed to be symmetrical to each other, the following description will be described together with the scan electrode and the sustain electrode.

The pair of transparent electrodes 251 is formed to extend in a direction intersecting the partition wall 16 on the opposite surface of the front substrate 20, and is located at one end inside the discharge cell 18. The transparent electrode 251 has a strip shape in shape. In addition, the transparent electrode 251 forms a discharge gap G that faces each other inside the discharge cell 18 to form an initial counter discharge.

The transparent electrode 251 may be configured as a protruding electrode as shown in FIG. That is, the transparent electrode 251 is provided along each discharge cell, the end of the transparent electrode 251 is in contact with the bus electrode 253 and the other side is formed to protrude toward the center of the discharge cell.

The first bus electrode 253 is extended at both ends of the transparent electrode 251 far from the discharge gap G in a state overlapping with the transparent electrode 251 in the same direction as the extending direction of the transparent electrode 251. Is formed. The first bus electrode 253 has a shape of a thin bar. Since the first bus electrode 253 itself is a non-transmissive material, the first bus electrode 253 is provided in contact with a portion of the transparent electrode positioned toward both ends of the discharge cell in order to increase the aperture ratio of the discharge cell.

The first bus electrode 253 compensates for the low conductivity of the transparent electrode 251 to lower the discharge start voltage.

A second bus electrode 255 is provided to overlap the transparent electrode 251 along the front end of the transparent electrode, that is, along the end of the transparent electrode 251 facing the discharge gap G. It is made of flakes. The second bus electrode 255 is made of the same non-transparent and highly conductive material (eg, silver (Ag)) as the first bus electrode 253. Since the second bus electrode 255 is located inside the discharge cell, the line width is preferably smaller than that of the first bus electrode 251 so as not to block visible light.

The second bus electrode 255 is in contact with the transparent electrode 251 at a position adjacent to the discharge gap G. Since the second bus electrode 255 has good conductivity, the conductivity of the transparent electrode 251 is compensated for. Therefore, the strength of the electric field formed in the discharge gap G toward the first bus electrode 253 is increased. Accordingly, the counter discharge starting from the discharge gap G acts to easily diffuse into the surface discharge diffused toward the bus electrode 253. In addition, the second bus electrodes 255 substantially face each other with the discharge gap G interposed therebetween, and since the second bus electrodes 255 have high conductivity, the discharge starts due to the electric field effect caused thereby. The voltage can be lowered than before.

On the other hand, when the transparent electrode is formed of a protruding electrode, grooves having a curved groove shape having a predetermined curvature may be further formed as end portions of the protruding electrode. Accordingly, the long gap G1 is formed with the recess 257 interposed therebetween, and the short gap G2 is shorter than the long gap G1 between the end regions where the recess is not formed.

As the concave portions 21c and 23c are formed in the protruding electrodes as described above, the discharge gap G includes the long gap G1 and the short gap G2, so that the discharge starts at the short gap G2 to the long gap G2. In the discharge mechanism that spreads and spreads throughout the discharge cell 18, the concave portion 257 forming the long gap G1 concentrates the discharge in the center so that the discharge can be stably made, and the short gap G2 is formed. End regions other than the concave portion can increase the discharge efficiency by lowering the discharge start voltage.

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 the claims to be described.

According to the present invention, it is possible to solve the above-mentioned problems and compensate for the low conductivity of the transparent electrode, thereby generating stable discharge even at a low driving voltage. Furthermore, due to the high conductivity of the bus electrodes, the counter discharge formed around the discharge gap is stably diffused in the form of surface discharge.

Claims (6)

A plasma display panel for displaying 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 disposed opposite to each other, Each electrode is formed by a combination of a transparent electrode in which the display electrodes face each other to form a discharge gap, and a bus electrode that complements the conductivity of the transparent electrode, The bus electrode includes a combination of a first bus electrode formed at an end of the transparent electrode far from the discharge gap and a second bus electrode formed along an end of the transparent electrode spaced apart from the first bus electrode and forming a discharge gap. Lose, And a concave portion forming a long gap and a short gap at an end portion at which the transparent electrode and the second bus electrode form a discharge gap. The method of claim 1, And a projection electrode in which the transparent electrode is provided along each discharge cell. The method of claim 2, And the concave portion forms a long gap and a short gap at an end portion of the protruding electrode. The method of claim 1, And a transparent strip extending in one direction. The method of claim 1, And a line width of the first bus electrode is greater than that of the second bus electrode. The method according to any one of claims 1 to 5, And the second bus electrode is formed of a non-transparent conductive material in the same manner as the first bus electrode.

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