KR20010002917A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to make the high frequency discharge by using the voltage pulse of the high frequency and to raise the brightness and to reduce consumption of the electricity by applying the superior high frequency discharge. CONSTITUTION: The device includes a lower board(100), address electrode lines(110), assistant electrodes(111), the first dielectric layer(120), a scanning electrode line(130), the second dielectric layer(140), a partition wall(160), an upper board(200) and a sustain electrode line(210). Many address electrode lines(110) are formed on the lower board(100) and many address electrode lines(110) are formed on each address electrode line at regular intervals. The first dielectric layer(120) is formed for applying the address electrode lines(110) and the assistant electrodes(111). The scanning electrode line(130) is at right angles to the address electrode lines(110) on the first dielectric layer(120). The second dielectric layer(140) is formed for applying the scanning electrode line(130). The partition wall(160) is formed with a lattice type for making the discharge space on the crossing portion of the address electrode and the scanning electrode. The impact of electron in the upper board(200) and the lower board(100) is decreased and that in the discharging gas is increased when the frequency of the high frequency voltage pulse permitted in the scanning electrode line(130) and the sustain electrode line(210) becomes higher and the space between the scanning electrode line(130) and the sustain electrode line(210) becomes wide.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to a discharge cell structure of a plasma display panel.

Plasma display panels and liquid crystal displays (LCDs) are spotlighted as next generation display devices with the highest practicality among flat panel display devices. In particular, the plasma display panel has a higher luminance and wider viewing angle than a liquid crystal display device, and thus has wide applicability as a large, thin display such as an outdoor advertising tower, a wall display TV, or a theater display.

In the typical three-electrode surface discharge plasma display panel, as shown in FIG. 1A, the upper substrate 10 and the lower substrate 20 installed to face each other are bonded to each other. FIG. 1B illustrates a cross-sectional structure of the plasma display panel illustrated in FIG. 1A, and the lower substrate 20 is rotated by 90 ° for convenience of description.

The upper substrate 10 is a dielectric layer for coating the scan electrodes 16 and 16 'and the sustain electrodes 17 and 17' formed in parallel with each other, and the scan electrodes 16 and 16 'and the sustain electrodes 17 and 17'. And a protective film 12, wherein the lower substrate 20 is formed between the address electrode 22 and the dielectric film 21 formed on the entire surface of the substrate including the address electrode 22, and the address electrode 22. As shown in FIG. A partition 23 formed on the dielectric film 21 of the dielectric film 21, and a phosphor 23 formed on the surface of the partition wall 23 and the dielectric film 21 in each discharge cell. The upper substrate 10 and the lower substrate 20 The space between) is filled with an inert gas such as helium (He), xenon (Xe), etc. at a pressure of about 400 to 500 Torr to form a discharge region.

The scan electrodes 16 and 16 'and the sustain electrodes 17 and 17' are made of transparent electrodes 16 and 17 and a metal bus as shown in FIGS. 2A and 2B to increase light transmittance of each discharge cell. It consists of electrodes 16 'and 17'. FIG. 2A is a plan view of the sustain electrodes 17 and 17 'and the scan electrodes 16 and 16', and FIG. 2B is a sectional view of the sustain electrodes 17 and 17 'and the scan electrodes 16 and 16'. The bus electrodes 16 'and 17' receive a discharge voltage from an external driving IC, and the transparent electrodes 16 and 17 receive a discharge voltage applied to the bus electrodes 16 'and 17' and are adjacent to each other. It causes discharge between (16, 17). The overall width of the transparent electrodes 16 and 17 is about 300 micrometers (µm) indium oxide or tin oxide, and the bus electrodes 16 'and 17' are made of chromium (Cr) -copper (Cu) -chromium. It consists of three thin films comprised of (Cr). At this time, the width of the bus electrode 16 ', 17' lines is set to approximately one third the width of the transparent electrode 16, 17 line.

The operation of the three-electrode surface discharge type AC plasma display panel is the same as that shown in FIGS. 3A to 3D.

First, when a driving voltage is applied between the address electrode and the scan electrode, a counter discharge occurs between the address electrode and the scan electrode as shown in FIG. 3A, and some of the electrons discharged from the inert gas in the discharge cell are lost due to the counter discharge. Impinge on the protective layer surface as shown in 3b. Due to the collision of electrons, electrons are secondarily emitted from the surface of the protective layer. The secondary electrons collide with the gas in the plasma state to diffuse the discharge. When the opposite discharge between the address electrode and the scan electrode is completed, wall charges of opposite polarities are generated on the surface of the protective layer on the address electrode and the scan electrode as shown in FIG. 3C.

When the discharge voltages having opposite polarities are continuously applied to the scan electrode and the sustain electrode, and the driving voltage applied to the address electrode is blocked at the same time, the potential difference between the scan electrode and the sustain electrode as shown in FIG. Surface discharge occurs in the discharge region on the surface of the dielectric layer and the protective layer. Due to the opposite discharge and the surface discharge, electrons present in the discharge cell collide with the inert gas inside the discharge cell. As a result, ultraviolet rays having a wavelength of 147 nm are generated in the discharge cells while the inert gas of the discharge cells is excited. The ultraviolet rays collide with the phosphor surrounding the address electrode and the partition wall to operate the plasma display panel.

However, in the conventional plasma display panel, since the discharge voltage must be increased to increase the brightness, there is a problem in that the discharge efficiency is limited. The reason is that if the potential difference between the address electrode and the scan electrode maintained at about 250 to 330 volts and the potential difference between the scan electrode and the sustain electrode maintained at about 150 to 200 volts is increased to increase the luminance, the dielectric state and the protective film are insulated. Is destroyed and the lifetime of the plasma display panel is shortened.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide a plasma display panel with high brightness and low power consumption.

1A is a perspective view illustrating a structure of a general plasma display panel.

1B is a cross-sectional view showing the structure of the plasma display panel shown in FIG. 1A.

2A is a plan view showing the structure of a sustain electrode installed on an upper substrate;

Figure 2b is a cross-sectional view showing the structure of the sustain electrode provided on the upper substrate

3A to 3D show the operation of the discharge cell in the write discharge section.

4 illustrates a portion of a plasma display panel according to the present invention.

5A to 5H illustrate a process of manufacturing a plasma display panel according to the present invention.

6 is a block diagram showing a configuration of a plasma display panel according to the present invention.

7 is a waveform diagram showing a voltage pulse for driving a plasma display panel according to the present invention.

8 is a view showing a lower substrate of the crossover type;

9 is a view showing the structure of a lower substrate according to the present invention;

Symbol description for main parts of drawing

100: lower substrate 110: address electrode line

111: auxiliary electrode 120: first dielectric layer

130: scan electrode line 140: second dielectric layer

150: shield 160: partition

170: phosphor 200: upper substrate

210: sustain electrode line 220: dielectric layer of the upper substrate

300: low band filter unit 400: high band filter unit

A characteristic of the present invention is that the discharge between the address electrode and the scan electrode is caused by a general alternating current (AC) voltage, and the discharge between the scan electrode and the sustain electrode is caused by a high frequency voltage.

Another feature of the present invention is that the address electrode line and the scan electrode line causing AC discharge of the hybrid plasma display panel are formed on the same plane.

The lower panel of the plasma display panel according to the present invention includes an address electrode line formed on the lower substrate, a plurality of auxiliary electrodes formed to be connected to the address electrode line, a first dielectric layer applying the address electrode line and the auxiliary electrode, and an address electrode line. And orthogonal scan electrode lines, a second dielectric layer to which the scan electrode lines are applied, a partition wall formed in a lattice shape on the second dielectric layer, and a phosphor layer formed on the side surface of the partition wall.

The upper substrate is a simple structure in which only a high frequency sustain electrode and a dielectric layer for RF sustain are formed. After the upper substrate and the lower substrate are bonded and exhausted, a discharge gas is injected to complete the device.

Hereinafter, a detailed structure of the plasma display panel according to the present invention will be described with reference to FIGS. 4 and 5A to 5H.

The address electrode lines 110 are continuously formed in one direction on the lower substrate 100 as in the case of the conventional plasma display panel. The address electrode line 110 receives a low frequency voltage pulse corresponding to a commercial AC voltage.

The auxiliary electrode 111 is one of the main features of the present invention, and is formed in a direction orthogonal to each address electrode line 110 so as to have discharge characteristics similar to those of the conventional AC discharge. Since the auxiliary electrode 111 is formed to be parallel to the scan electrode to be formed later, the address discharge does not occur only at the intersection of the address electrode line and the scan electrode line, but occurs on a parallel line with the auxiliary electrode. Therefore, the voltage required for addressing becomes low.

The first dielectric layer 120 is formed on the lower substrate 100 to apply the address electrode line 110 and the auxiliary electrode 111. The material of the first dielectric layer 120 may be the same as the conventional one.

The scan electrode line 130 is formed on the first dielectric layer 120 to be perpendicular to the address electrode. The scan electrode line 130 generates an AC discharge by applying a low frequency voltage corresponding to a frequency of a commercial alternating voltage between the address electrodes during a writing discharge, and a high frequency pulse when a sustain discharge is applied. It is used as a reference electrode of the high frequency sustain electrode is to cause a high frequency discharge.

The second dielectric layer 140 is formed on the first dielectric layer 120 to apply the scan electrode line 130. In this case, an additional passivation layer 150 may be additionally formed on the second dielectric layer 140 to prevent the dielectric layer from being damaged by the plasma discharge. The protective film 150 is preferably made of magnesium oxide (MgO).

A barrier rib 160 having a lattice shape is formed on the second dielectric layer 140 or on the passivation layer 150. The partition wall 160 is provided to form a discharge space having a predetermined area at the intersection of the address electrode line 110 and the scan electrode line 130. The reason why the partition wall 160 of the present invention is formed in a lattice shape is that a counter discharge occurs between the electrodes of the upper substrate 200 and the lower substrate 100 during a sustain discharge, and thus, a general straight partition 160 is formed. This is because it is difficult to isolate the discharge of each discharge cell. Therefore, the partition wall 160 of the present invention has a lattice shape so that each discharge cell is formed as an independent space. That is, the discharge cells of the plasma display panel according to the present invention have a lattice shape.

In addition, a phosphor layer 170 that emits light by plasma discharge is formed on a side surface of the partition wall 160, and each discharge space serves as a pixel of the plasma display panel by the phosphor layer 170. The reason why the phosphor layer 170 of the present invention is formed on the side surface of the partition wall 160 is that the sustain discharge is the opposite discharge between the upper substrate 200 and the lower substrate 100. This is because when the 170 is formed, the phosphor layer 170 is deteriorated by electrons and the color is changed.

As shown in FIG. 6, the driving unit of the plasma display panel according to the present invention is driven and controlled by the sustain control unit that generates high frequency discharge and the address control unit that generates AC discharge, and prevents interference with each other by mixing AC and RF. To this end, the low-band filter unit 300 and the high-band filter unit 400 are configured so that the high-frequency signal and the AC signal do not affect each other driving control signal.

Hereinafter, a method of manufacturing a plasma display panel according to the present invention is as follows.

First, as illustrated in FIG. 5A, a plurality of address electrode lines 110 is formed on a predetermined lower substrate 100. As shown in FIG. 5B, a plurality of auxiliary electrodes 111 are formed in each address electrode line 110 at regular intervals. Thereafter, as shown in FIG. 5C, the first dielectric layer 120 is formed to apply the address electrode line 110 and the auxiliary electrode 111.

After applying the address electrode line 110 and the auxiliary electrode 111 to the first dielectric layer 120, the scan electrode line 130 is formed on the first dielectric layer 120 as shown in FIG. 5D. In this case, the scan electrode line 130 is formed to be orthogonal to the address electrode line 110.

Thereafter, as shown in FIG. 5E, the second dielectric layer 140 is formed to apply the scan electrode line 130. In this case, the passivation layer 150 may be further formed on the second dielectric layer 140 as illustrated in FIG. 5F. As described above, the passivation layer 150 prevents electrons generated by the discharge of the discharge cell from colliding with the dielectric layer and promotes generation of secondary electrons due to the collision of electrons. Accordingly, the protective film 150 may be formed of a material such as magnesium oxide (MgO) in which secondary electrons are easily generated by plasma discharge electrons.

When the partition wall 160 as shown in FIG. 5G is formed on the second dielectric layer 140 or on the passivation layer 150, and the phosphor layer 170 is applied to the side surface of the partition wall 160, the layer shown in FIG. As described above, the lower substrate 100 of the plasma display panel according to the present invention is completed.

Hereinafter, the operation principle of the plasma display panel according to the present invention will be described with reference to FIGS. 7, 8, and 9.

First, when a write pulse of an AC voltage pulse is applied to the address electrode line 110 and the scan electrode line 130 of the plasma display panel, an address discharge occurs at a point where the two electrode lines cross each other. . At this time, the write voltage should have a starting voltage at which the plasma discharge can be applied to each discharge cell. When there is no auxiliary electrode, the discharge occurs only at the intersection of the address electrode line and the scan electrode line, so that the discharge efficiency is low. Although a voltage is required, in the present invention, since the actual address discharge is formed in parallel with the scan electrode and is connected to the auxiliary electrode connected to the address electrode line, the discharge occurs in the entire surface where the two electrodes are formed in parallel. Therefore, the discharge start voltage can be lowered.

The write pulse is applied to form an initial charge at an intersection of the address electrode line 110 and the scan electrode line 130. At this time, in the case of ADS (Address During Sustaining), since the potential by the high frequency voltage pulse is always maintained between the scan electrode line 130 and the sustain electrode line 210 of the upper substrate 200, the initial charge By the high frequency discharge is performed.

Ultraviolet rays generated by high frequency discharge in the discharge space between the scan electrode line 130 and the sustain electrode line 210 collide with the phosphor layer 170 formed on the sidewalls of the barrier rib 160 to collect electrons of the phosphor layer 170. Here it is. The electrons of the phosphor layer 170 excited by the ultraviolet rays are reduced to the ground state to generate visible light.

If the discharge of the discharge cell is to be stopped, the high frequency discharge may be disturbed by applying a voltage and an erase pulse below the potential at which the plasma discharge can be performed to the address electrode line 110.

In the high frequency discharge used in the present invention, since the electric field is changed at a higher speed than the normal AC discharge by the high frequency voltage pulse, the ions are less affected by the electric field than the electrons. This is because the mass of ions is heavier than the mass of electrons. Therefore, when a high frequency plasma discharge occurs, the electrons oscillate rapidly as the electric field changes.

At this time, when the frequency of the high frequency voltage pulse applied to the scan electrode line 130 and the sustain electrode line 210 becomes higher, and the interval between the scan electrode line 130 and the sustain electrode line 210 increases, collision of electrons occurs. What is done in the upper substrate 200 and the lower substrate 100 is reduced and what is made in the discharge gas is increased. That is, most of the collision between the electrons is made only in the discharge gas. The collision between electrons in this gas generates a plasma state and increases the ionization process and the excitation process, thereby reducing the energy consumption consumed by electrons colliding directly with the substrate.

The method using the high frequency and the AC voltage at the same time is very excellent in discharge efficiency and brightness compared to the conventional AC discharge, but when the circuit is implemented according to the mixing of the high frequency and the AC voltage may interfere with each other. In order to solve this problem, according to the present invention, each of the electrode lines includes a high band filter unit 400 as a sustain drive control unit to which high frequency is applied, and a low band filter unit 300 as an address control unit to which an AC voltage is applied. By connecting the driving control unit for driving to form a circuit independent from each other to prevent the interference of the signal. That is, although the sustain controller for high frequency driving actually configured and the address controller using AC share the scan electrode lines, the two circuit portions are electrically disconnected from each other. As a result, it was not easy to implement a circuit that mixes commercial AC and high frequency voltages.

In order to solve this problem, the plasma display panel of the present invention includes a low band filter unit 300 having a low pass filter (LPF) and a high band filter unit 400 having a high pass filter (HPF). The low frequency voltage pulse and the high frequency voltage pulse can be mixed. That is, although the circuit of the actually configured plasma display panel shares the scan electrode line 130, the low band filter unit 300 and the high band filter unit 400 are electrically blocked. As a result, the current due to the low frequency voltage pulse does not flow to the high band filter section 400, and the current due to the high frequency voltage pulse does not flow to the low band filter section 300.

In addition, in order to perform the write discharge using the AC pulse on the lower substrate 100, the write discharge and the erase discharge may be selectively performed on each discharge cell only when the address electrode line 110 and the scan electrode line 130 cross each other. Therefore, the electrode lines should be arranged in a cross-over structure as shown in FIG. 8, but in this case, there is a problem in that discharges are dispersed in all directions. As a result, there is a problem in that the discharge voltage for writing discharge becomes high, and the capacitors C1, C2, and Csh are parasitic, so that the lower substrate 100 cannot be easily designed.

In order to solve this problem, in the plasma display panel according to the present invention, as shown in FIG. 9, the auxiliary electrode 111 may be formed in a two-dimensional form, thereby limiting the discharged portion to a region between the address electrode and the scan electrode. . As a result, the discharge voltage for writing discharge is lowered and the parasitic capacitance Csh is adjusted according to the distance between the scan electrode and the auxiliary electrode 111, so that the lower substrate 100 can be easily designed. Therefore, the plasma display panel according to the present invention is not a general crossover structure but is configured in a new two-dimensional form as shown in FIG.

Plasma display panel according to the present invention can be applied to the high-frequency discharge with excellent energy efficiency and brightness compared to the conventional plasma display panel, there is an effect that can improve the power consumption and brightness. In addition, since the high band filter unit and the low band filter unit can be distinguished using a simple frequency filter, there is an advantage that a high frequency voltage pulse can be used without adding a new process or equipment.

Claims (5)

In a plasma display panel having an address electrode and a scan electrode formed on the lower substrate so as to be perpendicular to each other to cause AC addressing discharge, and a sustain electrode formed on the upper substrate so as to be parallel to the scan electrode to cause high frequency sustain discharge. And an auxiliary electrode connected to the address electrode and formed at each intersection with the scan electrode such that the addressing discharge occurs in a direction parallel to the scan electrode. The plasma display panel of claim 1, wherein the auxiliary electrode is formed on the address electrode line. The plasma display panel of claim 1, further comprising a protective film formed between the second dielectric layer and the partition wall to prevent damage of the second dielectric layer due to discharge of the plasma display panel. 4. The plasma display panel of claim 3, wherein the passivation layer is made of magnesium oxide (MgO). The high-band filter unit of claim 1, wherein the high-frequency filter unit applies a high frequency voltage having a frequency higher than a commercial AC voltage to the scan electrode. And a low band filter unit configured to apply a low frequency voltage corresponding to the frequency of the commercial AC voltage to the address electrode.