KR100570664B1 - Plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel driven by using positive column discharge characteristics. The plasma display panel according to the present invention includes a first substrate and a second substrate disposed to face each other, and a discharge gap on the first substrate. A pair of display electrodes positioned between the first and second substrates and partitioning the discharge cells, wherein the first partition member is disposed between two adjacent discharge cells along the length direction of the display electrode. And a partition wall in which the second partition member is spaced apart from each other, and an address electrode formed inside one of the partition wall members corresponding to each of the discharge cells. In this case, the discharge gap between the pair of display electrodes is greater than the distance between the display electrode and the address electrode.

Address electrode, display electrode, scan electrode, sustain electrode, positive pole, discharge gap, barrier rib

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 and 3 are partial cross-sectional views illustrating the assembled state of FIG. 1, respectively.

4A is a diagram illustrating sustain waveforms applicable to the plasma display panel of the present invention, and FIG. 4B is a diagram illustrating voltage differences between the scan electrode, the sustain electrode, and the address electrode in FIG. 4A.

5 is a schematic diagram showing a process of forming a discharge in a discharge cell.

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 driven by using positive column discharge characteristics and having improved structure of discharge cells in order to increase discharge efficiency.

A plasma display panel (PDP) is a display device that generates an image by exciting phosphors by vacuum ultraviolet rays generated by gas discharge in a discharge cell. Such PDPs are classified into a direct current type and an alternating current type according to the shape of the driving voltage waveform applied and the structure of the discharge cell, and an AC type PDP having a three-electrode surface discharge structure is generally used.

In a typical AC PDP, a partition wall is formed between the front substrate and the rear substrate to partition discharge cells, and display electrodes including address electrodes on the rear substrate and scan electrodes and sustain electrodes on the front substrate corresponding to each discharge cell. Is formed. The address electrodes and the display electrodes are covered with respective dielectric layers, and a phosphor layer is positioned inside each discharge cell. The discharge cells are filled with discharge gas (mainly Ne-Xe mixed gas), and the scan electrode and the sustain electrode located in one discharge cell have a small discharge gap of about 60 to 120 μm (hereinafter, referred to as a 'short discharge gap'). It is called).

In general, in the AC PDP, one frame is divided into a plurality of subfields, and each subfield includes a reset period, an address period, and a sustain period.

The reset period is a period of initializing the state of each discharge cell so that the addressing operation can be smoothly performed on the discharge cell. The address period is a period in which wall charges are accumulated in the discharge cells that are turned on by selecting the discharge cells that are turned on and the discharge cells that are not turned on. The period of time to perform an operation. The sustain period is a period in which discharge for actually displaying an image is performed on the discharge cells to be turned on.

In this AC type PDP, many researches for improving the efficiency (luminance ratio to power consumption) have been conducted. However, in the conventional discharge cell structure having the above-described short discharge gap, the study for improving the efficiency has reached its limit. As a result, research on a new discharge cell structure and a new driving method is being actively conducted, and one of them is a technique using a positive light discharge characteristic.

The above-described technology forms a large discharge gap (so-called 'long discharge gap') of about 400 μm or more between the scan electrode and the sustain electrode located in one discharge cell, and generates a positive light column in the long discharge gap, which is used for driving. Means. In addition, in the AC PDP using the positive discharge characteristics, various methods for reducing the discharge start voltage and the discharge sustain voltage have been studied.

SUMMARY OF THE INVENTION An object of the present invention is to form a long discharge gap between a scan electrode and a sustain electrode located in one discharge cell to enable positive light generation, thereby increasing panel efficiency and improving the structure of the discharge cell, thereby achieving high efficiency discharge at a lower driving voltage. The present invention provides a plasma display panel capable of preventing crosstalk between adjacent discharge cells.

In order to achieve the above object, the present invention,

A first substrate and a second substrate disposed to face each other, a pair of display electrodes positioned on the first substrate with a discharge gap therebetween, and disposed in a space between the first substrate and the second substrate to partition the discharge cells; The barrier rib is disposed between the two discharge cells adjacent to each other along the longitudinal direction of the display electrode, and the barrier rib is positioned to be spaced apart from each other, and the first barrier member and the second barrier member correspond to each discharge cell. A plasma display panel including an address electrode formed inside a partition member, wherein a discharge gap between a pair of display electrodes is greater than a distance between the display electrode and the address electrode.

The plasma display panel further includes a dielectric layer and an MgO passivation layer formed on the entire first substrate while covering the display electrodes, and a phosphor layer formed on a side surface of the partition wall facing the discharge cell and a bottom surface of the second substrate.

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

1 is a partially exploded perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIGS. 2 and 3 are partial cross-sectional views illustrating an assembled state of FIG. 1, respectively.

1 to 3, in the plasma display panel PDP, the first substrate 2 and the second substrate 4 are disposed to face each other at random intervals, and a space between the two substrates 2 and 4. Discharge cells 6R, 6G, and 6B are provided in the cell to implement an arbitrary color image with visible light emission by an independent discharge mechanism of each of the discharge cells 6R, 6G, and 6B.

First, display electrodes 12 formed of a pair of scan electrodes 8 and sustain electrodes 10 are formed on one surface of the first substrate 2 in one direction (the x-axis direction of the drawing) of the first substrate 2. The dielectric layer 14 and the MgO passivation layer 16 are disposed on the entirety of the first substrate 2 while covering the display electrodes 12. The scan electrode 8 and the sustain electrode 10 may be formed of a silver (Ag) electrode layer having excellent conductivity or an electrode layer in which chromium (Cr) / copper (Cu) / chromium (Cr) is stacked.

On the MgO passivation layer 16, the lattice-shaped partition wall 18 is formed along the longitudinal direction of the display electrode 12 and the direction orthogonal to the display electrode 12 (the y-axis direction in the drawing) to form discharge cells 6R, 6G, Section 6B). At this time, the first partition member 18a and the second partition member 18b are spaced apart from each other between the two discharge cells 6R-6G, 6G-6B, and 6B-6R adjacent to each other along the longitudinal direction of the display electrode 12. Located.

That is, in this embodiment, the partition wall 18 is a direction orthogonal to the display electrode 12 between two adjacent discharge cells 6R-6G, 6G-6B, and 6B-6R along the longitudinal direction of the display electrode 12. The first and second barrier rib members 18a and 18b may be spaced apart from each other along the third barrier rib member 18c positioned along the longitudinal direction of the display electrode 12.

The shape of the partition wall 18 is not limited to a lattice shape, and may be formed of a closed structure other than a stripe shape or a grid shape in which the third partition wall member 18c is omitted.

Any one of the first partition member 18a and the second partition member 18b, for example, a first partition member corresponding to each discharge cell 6R, 6G, 6B in the first partition member 18a. The address electrode 20 is formed along the direction of 18a. As a result, an address electrode 20 corresponding to the discharge cells 6R, 6G, 6B is provided in the first partition member 18a positioned on the right side of each discharge cell 6R, 6G, 6B with reference to the drawings.

Then, a transparent second substrate 4 is positioned on the partition 18, and red and green are disposed on the four sides of the partition 18 facing the inside of each discharge cell 6R, 6G, and 6B and on the bottom surface of the second substrate 4. Alternatively, blue phosphor layers 22R, 22G, and 22B are located. In this case, the address electrode 20 is positioned toward the first substrate 2 where the display electrodes 12 are positioned, rather than the second substrate 4, in the first partition member 18a to be aligned with the display electrode 12. Reduce the distance

In the present embodiment, the scan electrode 8 and the sustain electrode 10 have a so-called long discharge gap G larger than the distance between the address electrode 20 and the display electrode 12 (see FIG. 2) between them. Note). To this end, the scan electrode 8 and the sustain electrode 10 are disposed to correspond to the outer portions of the respective discharge cells 6R, 6G, and 6B, and the discharge gap G between the scan electrode 8 and the sustain electrode 10. Is set to approximately 200 µm or more.

The first substrate 2 and the second substrate 4 described above are integrally bonded at edges by a sealing material (not shown) such as a frit, and discharge gas (mainly Ne) is formed inside the discharge cells 6R, 6G, and 6B. -Xe mixed gas) is sealed in a filled state to constitute a PDP.

Thus, in the structure in which the address electrode 20 is positioned inside the partition 18, the address electrode 20 and the display electrode 12 are compared with the case where the address electrode 20 and the display electrode 12 are formed on different substrates. Distance is reduced. In the PDP of this embodiment, only the phosphor layers 22R, 22G, and 22B are coated on the second substrate 4, and no electrode or coating film is provided, and the second partition wall member 18b is formed of each of the discharge cells and the adjacent discharge cells. It is positioned to block the address electrodes 20.

The PDP of this embodiment generates a positive column discharge by generating a positive column discharge in the long discharge gap G between the scan electrode 8 and the sustain electrode 10 during PDP driving based on the low voltage sustain waveform described below. It has an improved panel efficiency than the conventional PDP that does not use.

According to the known positive-light discharge characteristic, since the distance between the two display electrodes 12 is larger than the distance between the address electrode 20 and the display electrode 12, the address is caused by the negative sustain voltage applied between the two display electrodes 12. Initial discharge starts between the electrode 20 and any one of the display electrodes 12 (I: trigger discharge), the initial discharge spreads along the address electrode 20 (II: discharge diffusion), and the long discharge gap ( Main discharge occurs between two display electrodes 12 having G) (III: main discharge).

4A is a diagram of sustain waveforms applicable to a PDP of the present invention, and FIG. 4B is a diagram illustrating voltage differences between three electrodes in FIG. 4A.

In FIG. 4A, Vx represents a voltage applied to the sustain electrode, Vy represents a voltage applied to the scan electrode, and Vz represents a voltage applied to the address electrode. The sustain waveform shown in FIG. 4A is a form in which a voltage pulse is applied to an address electrode in synchronization with a conventional sustain voltage pulse. In FIG. 4B, Vxy denotes a voltage difference between the sustain electrode and the scan electrode, Vyz denotes a voltage difference between the scan electrode and the address electrode, and Vzx denotes a voltage difference between the address electrode and the sustain electrode. 4A and 4B, T and A represent pulse widths and amplitudes of pulses applied to address electrodes, respectively.

When amplitude A is Vz in FIGS. 4A and 4B, FIG. 5 is a schematic diagram showing a discharge formation process in a mode that satisfies the condition of Vf (discharge starting voltage) <2Vz.

Referring to FIG. 5, the discharge is started between the scan electrode and the address electrode by an electric field induced by Vxy and Vyz (i: trigger), and the discharge is diffused along the address electrode by electrons charged in the partition wall (ii). (Diffusion), this discharge is connected to the sustain electrode to generate a main discharge (일어난: main discharge).

In FIG. 5, black arrows indicate discharge progression directions, and white arrows indicate electric field formation directions due to voltage differences. The voltage shown in FIG. 5 is a voltage used to start discharging, and a sustain voltage of approximately 160 V and an address auxiliary pulse voltage of approximately 80 V may be applied during actual sustain discharge.

In the above-described driving process, as the address electrode 20 is positioned closer to the display electrode 12 in the first partition member 18a, the discharge start voltage is further lowered, and the second substrate 4 As the phosphor layers 22R, 22G, and 22B are directly applied, the brightness and luminous efficiency of the screen are increased.

Furthermore, in the PDP of the present embodiment, although the discharge cells 6R, 6G, 6B and the address electrodes 20 of the adjacent discharge cells are located close to each other, the second partition member 18b is formed in each of the discharge cells 6R, 6G, Since the 6B) and the address electrode 20 of the adjacent discharge cells are blocked, it is possible to prevent the discharge from being induced into the adjacent discharge cells when driving the specific discharge cells 6R, 6G, and 6B. Therefore, the PDP of this embodiment is advantageous in preventing crosstalk between the discharge cells 6R, 6G, and 6B.

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

As described above, the plasma display panel according to the present invention can increase panel efficiency by using the positive-light discharge characteristic, and improves the brightness and luminous efficiency of the screen while enabling the low voltage driving by lowering the discharge start voltage by the above-described discharge cell structure. You can. In addition, the plasma display panel of the present invention is effective in preventing crosstalk by suppressing erroneous discharge between adjacent discharge cells.

Claims (7)

A first substrate and a second substrate disposed to face each other; A pair of display electrodes positioned on the first substrate with a discharge gap therebetween; Disposed in the space between the first substrate and the second substrate to partition the discharge cells, the first partition member and the second partition wall member is spaced apart from each other between two adjacent discharge cells along the longitudinal direction of the display electrode. septum; And An address electrode formed inside one of the first and second partition wall members corresponding to each of the discharge cells; And a discharge gap between the pair of display electrodes is greater than a distance between the display electrode and the address electrode. The method of claim 1, And the first partition member, the second partition member, and the address electrode are formed in a direction orthogonal to the display electrode. The method of claim 2, And a third partition wall member, wherein the partition wall is positioned along a length direction of the display electrode. The method of claim 1, And a phosphor layer formed on a side surface of the barrier rib and a bottom surface of the second substrate. The method of claim 1, A plasma display panel further comprising a dielectric layer and an MgO passivation layer formed over the first substrate while covering the display electrodes. The method of claim 1, And the display electrode is formed of a metal electrode layer. The method of claim 1, And the address electrode is located toward the first substrate in the partition wall.

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