KR100646277B1 - Plasma Display Panel - Google Patents

Abstract

The present invention relates to a plasma display panel. A plasma display panel comprising a discharge cell partitioned at regular intervals by a partition wall between a front substrate and a rear substrate, the plasma display panel comprising: a plurality of bus electrodes spaced apart from a central portion of the discharge cell; A plurality of branch portions are formed toward the outer side of the discharge cell and include transparent electrodes electrically connected to the bus electrodes, respectively.

According to the present invention, it is possible to lower the discharge start voltage and the discharge holding voltage by improving the electrode structure formed on the front substrate of the plasma display panel, thereby increasing the luminance characteristics and luminous efficiency according to the same applied voltage. have.

Plasma, Display, Panel, Bus Electrode, Transparent Electrode

Description

Plasma Display Panel             

1 is a perspective view schematically showing a device structure of a conventional PDP.

2 is a diagram illustrating a method of implementing image gradation of a conventional PDP.

3 is a view showing an electrode structure formed on a conventional PDP front substrate.

4 is a perspective view schematically showing a PDP according to the present invention;

5 is a view showing an electrode structure formed on the PDP front substrate according to the present invention.

Figure 6 is a view showing the electron density according to the structure of the PDP front substrate electrode of the present invention compared with the prior art.

7 is a graph illustrating the luminous efficiency according to the PDP electrode structure of the present invention and the luminous efficiency according to the conventional PDP electrode structure.

8 illustrates another electrode structure formed on the front substrate of the PDP according to the present invention.

***** Explanation of symbols for the main parts of the drawing *****

110: front substrate 111: scanning electrode

111a and 112a transparent electrodes 111b and 112b bus electrodes

111a ', 112a': Auxiliary electrode 112: Sustain electrode

113: dielectric layer 114: protective layer

220: rear substrate 221: address electrode

222: dielectric layer 223: partition wall

224: fluorescent layer

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having a surface discharge electrode structure.

In general, a plasma display panel (hereinafter, referred to as a PDP) has a partition wall formed between a front substrate and a rear substrate of soda-lime glass and constitutes one unit cell. When an inert gas such as helium-xenon (He-Xe) or helium-neon (He-Ne) is discharged by a high frequency voltage, vacuum ultraviolet rays are generated to emit phosphors formed between the partition walls. It is a device to implement.

1 is a perspective view schematically showing a device structure of a conventional PDP. As shown in the figure, the PDP 100 is coupled in parallel with the front substrate 10, which is a display surface on which an image is displayed, and the rear substrate 20, which forms a rear surface, with a predetermined distance therebetween.

The front substrate 10 is made of a metal material and sustain electrodes 11 and 12 for maintaining light emission of cells by mutual discharge in one pixel below, that is, transparent electrodes 11a and 12a formed of a transparent ITO material. The sustain electrodes 11 and 12 provided as the bus electrodes 11b and 12b are formed in pairs. The sustain electrode pair includes a scan electrode 11 and a sustain electrode 12. The scan electrode 11 is mainly supplied with a scan signal for scanning a panel and a sustain signal for sustaining discharge, and the sustain electrode 12 ) Is mainly supplied with a holding signal. The sustain electrodes 11 and 12 are covered by a dielectric layer 13a that limits the discharge current and insulates the electrode pairs, and magnesium oxide (MgO) is deposited on the top surface of the dielectric layer 13a to facilitate discharge conditions. The protective layer 14 is formed.

In the rear substrate 20, a plurality of discharge spaces, that is, stripe-type (or well-type) partition walls 21 for forming cells are arranged in parallel with each other and address discharge is performed at an intersection with the sustain electrode 11. A plurality of address electrodes 22, which are performed to generate vacuum ultraviolet rays, are disposed in parallel with the partition wall 21. In addition, a dielectric layer 13b is formed on an upper surface of the address electrode 22, and an R, G, and B fluorescent layer 23 that emits visible light for displaying an image upon address discharge is coated on the upper surface of the dielectric layer. A method of implementing image gradation of a PDP having such a structure is shown in FIG.

2 illustrates a method of implementing image gradation of a conventional PDP. As shown, the PDP image gray level is driven by dividing one frame into several subfields with different number of emission times, each subfield being for selecting a reset period (RPD) and a discharge cell for uniformly discharging again. It is divided into an sustain period SPD for implementing grayscales according to the address period APD and the number of discharge times. For example, when displaying an image with 256 gray levels, a frame period (16.7 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. Each of the subfields SF1 to SF8 is divided into a reset period, an address period, and a sustain period. The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting a cell is caused by the voltage difference between the address electrode as the data electrode and the transparent electrode as the scan electrode. The sustain period is increased at a rate of 2n (n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. In this way, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges.

On the other hand, the conventional PDP is to adjust the content of the inert gas, such as xenon (Xe) in the PDP, rather than improving the structure of the electrode formed on the front substrate as shown in Figure 3 to adjust the luminous efficiency, The luminous efficiency of the PDP is proportional to the content of xenon (Xe), which is an inert gas.

However, a large amount of xenon gas in the panel contributes to increase the luminous efficiency of the PDP, but on the contrary, there is a problem of increasing the discharge start voltage and the discharge sustain voltage between the electrodes formed on the front substrate of the PDP.

In addition, when the content of the xenon gas increases, discharge instability such as an increase in discharge delay time is caused.

 Accordingly, an object of the present invention is to provide a plasma display panel which can improve the electrode structure formed on the front substrate of the PDP, lower the discharge start voltage and the discharge sustain voltage, and improve luminous efficiency.

Plasma display panel of the present invention for achieving the above object is a plasma display panel including a discharge cell partitioned at regular intervals by a partition between the front substrate and the rear substrate, a plurality of formed spaced apart in the center of the discharge cell A bus electrode; A plurality of branch portions are formed toward the outer side of the discharge cell and include transparent electrodes electrically connected to the bus electrodes, respectively.
According to this feature, the transparent electrode has at least one auxiliary electrode formed at the end of the branch portion.
According to this feature, the bus electrode has a width smaller than 1/4 of the vertical width of the discharge cell.

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Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

4 is a perspective view schematically showing a PDP according to the present invention. As illustrated, the front substrate 110, which is the display surface on which the image is displayed, and the rear substrate 220 forming the rear surface are coupled in parallel with a predetermined distance therebetween.

On the front substrate 110, scan electrodes 111 and sustain electrodes 112 are formed in pairs of sustain electrodes 111 and 112, and the scan electrodes 111 and sustain electrodes 112 are made of transparent ITO material, respectively. The electrodes 111a and 112a and the bus electrodes 111b and 112b made of metal are integrally formed. In addition, an upper dielectric layer 113 is stacked on the front substrate in which the scan electrode and the sustain electrode are arranged in parallel to limit the discharge current and to insulate the scan electrode 111 and the sustain electrode 112 from each other. In addition, the upper dielectric layer 113 is formed with a protective layer 114 on which magnesium oxide (MgO) is deposited to prevent damage to the upper dielectric layer and to increase emission efficiency of secondary electrons by sputtering generated during plasma discharge.

On the rear substrate 220, a plurality of address electrodes 221 are provided in a direction crossing the scan electrodes 111 and the sustain electrodes 112 arranged in parallel with the front substrate, and a wall is formed on the address electrodes 221. Lower dielectric layer 222 is formed for charge accumulation. A partition wall 223 is formed on the lower dielectric layer 222, and a fluorescent layer 224 is coated on a surface of the partition wall 223 to generate visible light of any one of R, G, and B during discharge. Done.

Looking at the electrode structure formed on the front substrate in the PDP of the present invention having such a structure as shown in FIG.

5 shows an electrode structure of a PDP front substrate according to the present invention.

As illustrated, the electrode formed on the PDP front substrate is referred to as the vertical width of the discharge cells partitioned at regular intervals by a partition wall (h), and when the horizontal width is w, a bus among the electrodes formed on the front substrate. Electrodes 111b and 112b are disposed within a point h / 4 at the center of the discharge cell (d <h / 4), and transparent electrodes 111a and 112a among the electrodes formed on the front substrate are installed in the discharge cell. . As described above, the bus electrodes 111b and 112b provided at the center of the discharge cell strengthen the electric field at the center of the PDP when driving the PDP, compared to the bus electrodes installed at the center of the discharge cell, thereby reducing the discharge start voltage and the discharge sustain voltage.

On the other hand, as described above, the bus electrodes 111b and 112b substantially provided at the center portion of the cell may be made of an opaque metal material, which may cause a decrease in luminance by decreasing transmittance during discharge. Therefore, the structure of the transparent electrodes 111a and 112a forms protrusions (or branch portions) from the center of the discharge cell toward the outer portion so as to effectively transmit the discharge generated at the center of the cell to the outer portion of the cell to increase the overall brightness. Preferably, the protrusion of the transparent electrode has a '山' shape.

Figure 6 shows the electron density according to the electrode structure of the PDP front substrate of the present invention compared with the prior art. Referring to FIG. 6, it can be seen that the electron density according to the PDP electrode structure of the present invention is higher in the discharge cell region than in the related art, thereby further strengthening the electric field during PDP driving. Looking at the PDP luminous efficiency of the present invention having such a structure as shown in FIG.

7 is a graph illustrating the luminous efficiency according to the PDP electrode structure of the present invention and the luminous efficiency according to the conventional PDP electrode structure. Referring to FIG. 7, the displayed convention graph is a conventional PDP electrode structure, and shows luminous efficiency when the position of the bus electrode is located at the outer portion of the discharge cell. In-Bus graph The PDP electrode structure according to the present invention shows the luminous efficiency when the bus electrode is located at the center of the discharge cell. Looking at this, it can be seen that the luminous efficiency according to the PDP electrode structure of the present invention is increased by about 5% compared to the conventional PDP electrode structure.

8 illustrates another electrode structure formed on the front substrate of the PDP according to the present invention. Referring to FIG. 8, as shown in (a), the auxiliary electrode 111a 'is formed at the end of the longest protruding portion (or branch portion) of the transparent electrodes 111a and 112a having a' yama 'shape from the center of the discharge cell to the outer edge thereof. , 112a 'is formed, or as shown in (b), auxiliary electrodes 111a' and 112a 'are formed at all ends of the protruding portions (or branch portions) of the transparent electrodes 111a and 112a. As described above, the auxiliary electrodes 111a 'and 112a' formed at the end of the transparent electrode protruding portion may cause a strong electric field at the position where the auxiliary electrode is formed during PDP driving, thereby lowering the discharge start voltage and improving luminance characteristics by expanding the discharge region. It becomes possible.

As described above, it will be understood by those skilled in the art that the technical configuration of the present invention may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the electrode structure formed on the front surface of the PDP may be improved to lower the discharge start voltage and the discharge sustain voltage, thereby increasing luminance characteristics and luminous efficiency according to the same applied voltage.

Claims (6)

In the plasma display panel including a discharge cell partitioned at regular intervals by a partition wall between the front substrate and the rear substrate, A pair of bus electrodes formed spaced apart from a central portion of the discharge cell and installed at a point h / 4 from the center of the discharge cell when h is a vertical width of the discharge cell; At least one branch portion is formed toward an outer side of the discharge cell, and includes a pair of transparent electrodes electrically connected to the bus electrodes, respectively. delete delete The method of claim 1, And the auxiliary electrode is formed at an end of at least one branch of the transparent electrode. delete delete

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