KR100400378B1 - Plasma Display Panel - Google Patents

Abstract

The present invention relates to a plasma display panel capable of improving discharge efficiency.

The plasma display panel of the present invention is formed on the upper substrate and formed in the direction intersecting the first and second trigger electrodes on the lower substrate opposite to the upper substrate and the first and second trigger electrodes formed on the center of the discharge cell. At least one of a first electrode and a second trigger electrode in a width direction of the partition wall; a barrier rib formed in parallel with the address electrode between the upper substrate and the lower substrate; A wing portion is formed to extend and overlap with the above electrode.

Description

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 capable of improving discharge efficiency.

Plasma Display Panel (hereinafter referred to as "PDP") is a display device using visible light generated from a phosphor when vacuum ultraviolet rays generated by gas discharge excite the phosphor. PDP is thinner and lighter than Cathode Ray Tube (CRT), which has been the mainstay of display means, and has the advantage of being able to realize high definition large screen. PDP is composed of a plurality of discharge cells arranged in a matrix form, one discharge cell constitutes a pixel of the screen.

1 is a perspective view showing a discharge cell structure of a conventional three-electrode AC surface discharge type PDP.

Referring to FIG. 1, a discharge cell of a conventional three-electrode AC surface discharge type PDP is formed on a scan / sustain electrode 12Y and a common sustain electrode 12Z formed on an upper substrate 10, and on a lower substrate 18. The formed address electrode 20X is provided. The upper dielectric layer 14 and the passivation layer 16 are stacked on the upper substrate 10 having the scan / sustain electrode 12Y and the common sustain electrode 12Z side by side. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated. The protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases discharge efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used. The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode 20X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in the direction crossing the scan / sustain electrode 12Y and the common sustain electrode 12Z. The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 10 / lower substrate 18 and the partition wall 24.

The AC surface discharge type PDP is driven by dividing one frame into several subfields having different discharge times in order to express gray level of an image. Each subfield is further divided into a reset period for uniformly causing discharge, an address period for selecting a discharge cell, and a sustain period for expressing gray scale according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. Each of the eight subfields is further divided into an address period and a sustain period. Here, the reset period and the address period of each subfield are the same for each subfield, while the sustain period is 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. Is increased. In this way, since the sustain period is different in each subfield, the gray level of the image can be expressed.

Here, in the reset period, a reset pulse is supplied to the common sustain electrode 12Z to cause reset discharge. In the address period, scan pulses are supplied to the scan / sustain electrodes 12Y, and data pulses are supplied to the address electrodes 20X to generate address discharges between the two electrodes 12Y and 20X. During the address discharge, wall charges are formed in the upper and lower dielectric layers 14 and 22. In the sustain period, sustain discharge occurs between the two electrodes 12Y and 12Z by an alternating current signal alternately supplied to the scan / sustain electrode 12Y and the common sustain electrode 12Z.

However, in the conventional AC surface discharge PDP, the sustain discharge space is concentrated in the center of the upper substrate 10 as shown in FIG. Accordingly, there is a problem that the discharge area is reduced and the luminous efficiency is reduced. In order to solve this problem, a 5-electrode AC surface discharge type PDP as shown in FIGS. 3 and 4 has been proposed.

3 and 4 are a perspective view and a cross-sectional view showing a discharge cell structure of a conventional 5-electrode AC surface discharge type PDP.

Referring to FIGS. 3 and 4, the conventional 5-electrode AC surface discharge type PDP includes first and second trigger electrodes 34Y and 34Z formed on the upper substrate 30 so as to be positioned at the center of the discharge cell. The lower substrate in a direction orthogonal to the first and second sustain electrodes 32Y and 32Z, the trigger electrodes 34Y and 34Z, and the sustain electrodes 32Y and 32Z formed on the upper substrate 30 so as to be positioned at the edges. An address electrode 42X formed in the center portion of the 40 is provided. An upper dielectric layer 36 and a protective layer 38 are stacked on the upper substrate 30 having the sustain electrodes 32Y and 32Z and the trigger electrodes 34Y and 34Z side by side. The lower dielectric layer 44 and the barrier rib 46 are formed on the lower substrate 40 on which the address electrode 42X is formed, and the phosphor layer 48 is coated on the surfaces of the lower dielectric layer 44 and the barrier rib 46. The trigger electrodes 34Y and 34Z formed at narrow intervals in the center of the discharge cell are used to start the sustain discharge by receiving an AC pulse during the sustain period. The first sustain electrode 32Y and the second sustain electrode 32Z formed at a wide interval at the edge of the discharge cell are supplied with alternating current pulses during the sustain period to start the discharge between the trigger electrodes 34Y and 34Z, and then maintain the plasma discharge. Used for.

The conventional 5-electrode AC surface discharge type PDP is driven by dividing one frame into several subfields having different discharge times in order to express the gray level of an image. Each subfield is further divided into a reset period for uniformly generating discharge, an address period for selecting a discharge cell, and a sustain period for expressing gray scale according to the number of discharges. In the reset period, a reset pulse is supplied to the first trigger electrode 34Y of the discharge cell to generate reset discharge for initializing the discharge cell. In the address period, scan pulses are sequentially supplied to the first trigger electrode 34Y, and data pulses synchronized with the scan pulses are supplied to the address electrodes 42X. At this time, an address discharge occurs in the discharge cell supplied with the data pulse. In the sustain period, a sustain pulse having a predetermined voltage level is alternately supplied to the first and second sustain electrodes 32Y and 32Z, and a voltage level lower than that of the sustain pulse is supplied to the first and second trigger electrodes 34Y and 34Z. Trigger pulses are alternately supplied. Trigger discharge between the first and second trigger electrodes 34Y and 34Z when the sustain pulse and the trigger pulse are supplied to the first and second sustain electrodes 32Y and 32Z and the first and second trigger electrodes 34Y and 34Z. This happens. When trigger discharge occurs as described above, charged particles are generated, and the secondary discharge is induced between the first and second sustain electrodes 32Y and 32Z by the priming effect of the generated charged particles.

The discharge contributing to the luminance in the five-electrode PDP operating as described above is the sustain discharge occurring between the first sustain electrode 32Y and the second sustain electrode 32Z. The trigger discharge generated between the trigger electrodes 34Y and 34Z is a discharge for generating charged particles so that a sustain discharge can occur. Therefore, a fine discharge should occur between the trigger electrodes 34Y and 34Z. However, since the trigger electrodes 34Y and 34Z are formed at narrow intervals and wall charges are formed in the first trigger electrode 34Y in the address period, strong discharge occurs between the trigger electrodes 34Y and 34Z. . If a strong discharge is generated between the trigger electrodes 34Y and 34Z as described above, the discharge between the sustain electrodes 32Y and 32Z is weakened, resulting in a decrease in discharge efficiency.

Accordingly, an object of the present invention relates to a plasma display panel that can improve discharge efficiency.

1 is a perspective view showing a conventional three-electrode AC surface discharge type plasma display panel.

FIG. 2 is a cross-sectional view showing sustain discharge of the plasma display panel shown in FIG. 1; FIG.

3 is a perspective view showing a conventional 5-electrode AC surface discharge type plasma display panel.

4 is a view showing an electrode structure of the plasma display panel shown in FIG.

5 illustrates a plasma display panel according to an embodiment of the present invention.

6 illustrates a plasma display panel according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10,30: upper substrate 12Y: scan / sustain electrode

12Z: common sustain electrode 14,22,36,44: dielectric layer

16,38: protective film 18,40: lower substrate

20X, 42X, 54X: address electrode 24, 46, 56: partition wall

26,48: phosphor layer 32Y, 32Z, 50Y, 50Z: sustain electrode

34Y, 34Z, 52Y, 52Z: trigger electrode 60a, 60b, 62a, 62b: wing

In order to achieve the above object, the plasma display panel of the present invention includes first and second trigger electrodes formed on an upper substrate and formed in the center of a discharge cell, and first and second trigger electrodes on a lower substrate facing the upper substrate. An address electrode formed in a direction intersecting with the first and second electrodes, a partition wall formed parallel to the address electrode between the upper substrate and the lower substrate, a pair of sustain electrodes formed at an edge of the discharge cell, and a first and a first direction in the width direction of the partition wall; And a wing formed to extend to overlap at least one of the two trigger electrodes.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 6.

5 is a diagram illustrating a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the plasma display panel according to the exemplary embodiment of the present invention is formed on the upper substrate (not shown) and is formed on the trigger electrodes 52Y and 52Z formed at the center of the discharge cell, and the peripheral parts of the discharge cell. Sustain electrodes 50Y and 50Z and an address electrode 54X formed on a lower substrate (not shown) opposite to the upper substrate in a direction crossing the trigger electrodes 52Y and 52Z and the sustain electrodes 50Y and 50Z. ). A partition wall 56 is formed between the upper substrate and the lower substrate in a direction parallel to the address electrode 54X. Meanwhile, in the present invention, wing parts 62a and 62b are formed to reduce the discharge space in which trigger discharge occurs. The wings 62a and 62b extend from the partition wall 56 so as to overlap the trigger electrodes 52Y and 52Z.

The five-electrode AC surface discharge type PDP of the present invention is driven by dividing one frame into several subfields having different discharge times in order to express the gray level of an image. Each subfield is further divided into a reset period for uniformly generating discharge, an address period for selecting a discharge cell, and a sustain period for expressing gray scale according to the number of discharges. In the reset period, a reset pulse is supplied to the first trigger electrode 52Y of the discharge cell to generate reset discharge for initializing the discharge cell. In the address period, scan pulses are sequentially supplied to the first trigger electrode 52Y, and data pulses synchronized with the scan pulses are supplied to the address electrode 54X. At this time, an address discharge occurs in the discharge cell supplied with the data pulse. In the sustain period, a sustain pulse having a predetermined voltage level is alternately supplied to the first and second sustain electrodes 50Y and 50Z, and a voltage level lower than that of the sustain pulse is supplied to the first and second trigger electrodes 52Y and 52Z. Trigger pulses are alternately supplied. Trigger discharge between the first and second trigger electrodes 52Y and 52Z when the sustain pulse and the trigger pulse are supplied to the first and second sustain electrodes 50Y and 50Z and the first and second trigger electrodes 52Y and 52Z. This happens. At this time, the discharge space of the trigger discharge is reduced by the wing portions (60a, 60b) than the sustain discharge space. Therefore, a weak trigger discharge occurs between the trigger electrodes 52Y and 52Z. When trigger discharge occurs as described above, charged particles are generated, and the secondary discharge is induced between the first and second sustain electrodes 50Y and 50Z by the priming effect of the generated charged particles. That is, in the PDP of the present invention, the trigger discharge space is reduced, so that a weak trigger discharge occurs, and thus a strong sustain discharge can be generated, thereby improving the discharge efficiency. Meanwhile, in the PDP of the present invention, since the wing portions 60a and 60b are formed at portions overlapping the first and second trigger electrodes 52Y and 52Z, sufficient wall charges may not be formed in the address discharge period. have. That is, sufficient wing space may not be secured by the wing portions 60a and 60b formed on the first trigger electrode 52Y, and thus sufficient wall charges may not be formed in the discharge cells. In order to compensate for this disadvantage, the wing portions 62a and 62b may be formed only at a portion where the partition wall 56 and the second trigger electrode 52Z overlap with each other as shown in FIG. 6.

As described above, according to the plasma display panel according to the present invention, a wing portion extending from the barrier rib is formed at a portion where the barrier rib and the first and second trigger electrodes or the second trigger electrode overlap to reduce the trigger discharge space. Since the wing portion is formed in this way, the trigger discharge space is reduced, so that a weak trigger discharge is generated, and a strong trigger discharge is induced by the weak trigger discharge, thereby improving discharge efficiency.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

First and second trigger electrodes formed on the upper substrate and formed in the center of the discharge cell; An address electrode formed on the lower substrate opposite to the upper substrate in a direction crossing the first and second trigger electrodes; Barrier ribs formed between the upper substrate and the lower substrate in parallel with the address electrode; A pair of sustain electrodes formed at an edge of the discharge cell; And a wing portion extending and overlapping with at least one of the first and second trigger electrodes in the width direction of the barrier rib. delete The method of claim 1, And the wing portion does not overlap the first trigger electrode supplied with the scan pulse in an address period for selecting the discharge cell. The method of claim 3, wherein And the wing portion extends in both width directions of the partition wall.