KR100545022B1 - Plasma display panel - Google Patents

Abstract

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

According to an embodiment of the present invention, transparent electrodes spaced apart from each other by a predetermined distance, metal electrodes formed at one edge of each of the transparent electrodes, and auxiliary electrodes formed on each of the transparent electrodes so as to be biased toward opposite sides of each of the transparent electrodes And metal electrodes.

By such a configuration, the present invention can enhance the electric field at the center of the discharge cell applied in the discharge space to induce a strong discharge to improve the brightness and efficiency.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}             

1 is a perspective view showing a discharge cell of a conventional plasma display panel.

FIG. 2 is a plan view illustrating the sustain electrode pair shown in FIG. 1; FIG.

3 is a perspective view showing a discharge cell of the plasma display panel according to an embodiment of the present invention.

4 is a plan view illustrating a sustain electrode pair according to a first embodiment of the present invention illustrated in FIG. 3.

FIG. 5 is a cross-sectional view taken along the line AA ′ of FIG. 4. FIG.

FIG. 6 is a diagram showing current densities generated during discharge of the sustain electrode pairs shown in FIG. 4; FIG.

FIG. 7 is a view showing a discharge phenomenon extending from the center of the discharge cell to the outside by the discharge of the sustain electrode pair shown in FIG. 4; FIG.

8 is a graph comparing the brightness of the present invention and conventional brightness according to the discharge voltage.

9 is a graph comparing the present invention and conventional efficiency according to the discharge voltage.

10 is a plan view illustrating a sustain electrode pair according to a second embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along the line BB ′ shown in FIG. 10. FIG.

12 is a plan view illustrating a sustain electrode pair according to a third embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10, 110: upper substrate 12, 112: lower substrate

14, 114, 214, 314: scan electrodes 16, 116, 216, 316: sustain electrodes

14A, 114A, 214A, 314A: Transparent electrode 14B, 114B, 214B, 314B: Metal electrode

16A, 116A, 216A, 316A: transparent electrode 16B, 116B, 216B, 316B: metal electrode

18, 118: upper dielectric layer 20, 120: protective film

22, 122: address electrodes 24, 124: lower dielectric layer

26, 126: partition 28, 128: phosphor layer

114C, 214C, 314C: auxiliary metal electrode 116C, 216C, 316C: auxiliary metal electrode

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 brightness and efficiency.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays (LCDs), field emission displays (FEDs), plasma display panels (hereinafter referred to as "PDPs"), and electroluminescence (Electro). -Luminescence (EL) display.

PDP is a display device using a gas discharge has the advantage that it is easy to manufacture a large panel. As a PDP, a three-electrode AC surface discharge type PDP having three electrodes and driven by an alternating voltage is typical.

1 is a perspective view illustrating a cell structure typically arranged in an alternating current type PDP in a matrix form.

Referring to FIG. 1, a conventional PDP cell includes an upper plate having sustain electrode pairs 14 and 16, an upper dielectric layer 18, and a passivation layer 20 sequentially formed on an upper substrate 10, and a lower substrate 12. ), A lower plate having an address electrode 22, a lower dielectric layer 24, a partition wall 26, and a phosphor layer 28 formed sequentially. The upper substrate 10 and the lower substrate 12 are spaced in parallel by the partition wall 26.

Charges accumulate in the upper dielectric layer 18 and the lower dielectric layer 24. The protective film 20 prevents damage to the upper dielectric layer 18 by sputtering, thereby increasing the lifetime of the PDP and increasing the emission efficiency of secondary electrons. As the protective film 20, magnesium oxide (MgO) is usually used.

The address electrode 22 is formed to cross the sustain electrode pairs 14 and 16. The address electrode 22 is supplied with a data signal for selecting cells to be displayed.

The partition wall 26 is formed in parallel with the address electrode 22 to prevent ultraviolet rays generated by the discharge from leaking to adjacent cells. In this case, the partition wall 26 may or may not exist at the boundary line of the subpixel.

The phosphor layer 28 is applied to the surfaces of the lower dielectric layer 24 and the partition wall 26 to generate visible light of any one of red, green, and blue. Then, an inert gas for gas discharge is injected into the discharge space therein.

Inert gas, such as He + Xe, Ne + Xe, He + Xe + Ne, for gas discharge, is injected into the discharge space provided between the upper substrate 10, the lower substrate 12, and the partition wall 26.

The sustain electrode pairs 14 and 16 are constituted by the scan electrode 14 and the sustain electrode 16. The scan signal for panel scanning and the sustain signal for sustaining discharge are mainly supplied to the scan electrode 14, and the sustain signal is mainly supplied to the sustain electrode 16.

Each of the sustain electrode pairs 14 and 16 has a relatively wide width and has a stripe-shaped transparent electrode 14A and 16A made of transparent electrode material (ITO) to transmit visible light, and has a relatively narrow width and transparency. In order to compensate for the resistive components of the electrodes 14A and 16A, the metal electrodes 14B and 16B are formed. At this time, the transparent electrodes 14A and 16A of the sustain electrode pairs 14 and 16 face each other with a predetermined gap Gap therebetween. In addition, each of the metal electrodes 14B and 16B of the sustain electrode pairs 14 and 16 is formed at one edge of the transparent electrodes 14A and 16A so as to be positioned at the outer portion of the discharge cell as shown in FIG. 2. That is, each of the metal electrodes 14B and 16B is formed at the outer edge of the transparent electrodes 14A and 16A.

The PDP cell of this structure is selected by the counter discharge between the address electrode 22 and the scan electrode 14, and then sustains the discharge by the surface discharge between the sustain electrode pairs 14 and 16. In the PDP cell, the fluorescent substance 28 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted outside the cell. As a result, the PDP having cells displays an image. In this case, the PDP implements a gray scale required for displaying an image by adjusting the discharge sustain period of the cell, that is, the number of sustain discharges, according to the video data.

In the conventional PDP, xenon (Xe) of the inert gas injected into the discharge space excites the phosphor 28 by using vacuum ultraviolet rays generated when a change from the excited state to the ground state is caused by gas discharge. Accordingly, as the content of xenon (Xe) included in the inert gas increases, the amount of vacuum ultraviolet rays generated during gas discharge in the discharge space increases, thereby increasing the efficiency of the PDP. However, an increase in the content of xenon (Xe) becomes a factor of increasing the discharge start voltage and the discharge sustain voltage between the sustain electrode pairs 14 and 16.

Accordingly, in the conventional PDP, since the metal electrodes 14B and 16B are formed at the outer edges of the transparent electrodes 14A and 16A, the distance between the metal electrodes 14B and 16B is long, so that the discharge start voltage and the sustain voltage are maintained. Will be raised. Accordingly, the conventional PDP is reduced in brightness and efficiency.

Accordingly, an object of the present invention is to provide a plasma display panel capable of improving brightness and efficiency.

In order to achieve the above object, a plasma display panel according to an exemplary embodiment of the present invention includes transparent electrodes spaced apart from each other by a predetermined distance, metal electrodes formed at one edge of each of the transparent electrodes, and each of the transparent electrodes. Auxiliary metal electrodes formed on each of the transparent electrodes so as to be biased toward the opposite side from the.

The auxiliary metal electrodes of the plasma display panel may be formed between the opposite sides from the center of the width direction of the transparent electrode.

Each of the auxiliary metal electrodes of the plasma display panel includes a plurality of electrode patterns formed at equal intervals.

The electrode patterns of the plasma display panel may be one or more columns.

In the plasma display panel, the electrode patterns are arranged in two rows and are parallel to each other.

The electrode patterns may be arranged in a zigzag form in the plasma display panel.

In the plasma display panel, each of the electrode patterns is rectangular.

Other objects and features of the present invention in addition to the above object will be 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. 3 to 12.

Referring to FIG. 3, a plasma display panel (hereinafter referred to as a “PDP”) according to a first exemplary embodiment of the present invention may include sustain electrode pairs 114 and 116 sequentially formed on the upper substrate 110. The upper plate having the upper dielectric layer 118 and the passivation layer 120, the address electrode 122, the lower dielectric layer 124, the partition wall 126, and the phosphor layer 128 sequentially formed on the lower substrate 112 may be formed. The branches have a lower plate. The upper substrate 110 and the lower substrate 112 are spaced in parallel by the partition wall 126.

Charges are accumulated in the upper dielectric layer 118 and the lower dielectric layer 124. The passivation layer 120 prevents damage to the upper dielectric layer 118 by sputtering, thereby increasing the lifetime of the PDP and increasing the emission efficiency of secondary electrons. As the protective film 120, magnesium oxide (MgO) is usually used.

The address electrode 122 is formed to cross the sustain electrode pairs 114 and 116. The address electrode 122 is supplied with a data signal for selecting cells to be displayed.

The partition wall 126 is formed in parallel with the address electrode 122 to prevent the ultraviolet rays generated by the discharge from leaking to the adjacent cells. In this case, the partition wall 126 may or may not exist at the boundary line of the subpixel.

The phosphor layer 128 is applied to the surfaces of the lower dielectric layer 124 and the partition wall 126 to generate visible light of any one of red, green, and blue. Then, an inert gas for gas discharge is injected into the discharge space therein.

Inert gas, such as He + Xe, Ne + Xe, He + Xe + Ne, for gas discharge, is injected into the discharge space provided between the upper substrate 110, the lower substrate 112, and the partition wall 126.

The sustain electrode pairs 114 and 116 are composed of the scan electrode 114 and the sustain electrode 116. The scan signal for scanning the panel and the sustain signal for maintaining the discharge are mainly supplied to the scan electrode 114, and the sustain signal is mainly supplied to the sustain electrode 116.

Each of the sustain electrode pairs 114 and 116 has a relatively wide width and has a stripe-shaped transparent electrode 114A and 116A made of transparent electrode material (ITO) to transmit visible light, and has a relatively narrow width and transparency. In order to compensate the resistive components of the electrodes 114A and 116A, the metal electrodes 114B and 116B and the plurality of auxiliary metal electrodes 114C and 116C are formed. At this time, the transparent electrodes 114A and 116A of the sustain electrode pairs 114 and 116 face each other with a predetermined gap therebetween.

Each of the metal electrodes 114B and 116B of the sustain electrode pairs 114 and 116 is formed at one edge of each of the transparent electrodes 114A and 116A, as shown in FIG. 4.

Each of the plurality of auxiliary metal electrodes 114C and 116C has a square shape as shown in FIG. 5 at equal intervals to each of the transparent electrodes 114A and 116A such that each of the transparent electrodes 114A and 116A is biased toward the opposite side. Is formed. Each of the plurality of auxiliary metal electrodes 114C and 116C receives a discharge voltage supplied from the metal electrodes 114B and 116B through the transparent electrodes 114A and 116A during discharging, thereby strengthening an electric field applied to the discharge space. Will induce a discharge. Accordingly, each of the plurality of auxiliary metal electrodes 114C and 116C reduces the discharge start voltage and the sustain voltage by inducing a strong electric field in the center of the discharge cell.

The PDP cell of this structure is selected by the counter discharge between the address electrode 122 and the scan electrode 114, and then sustains the discharge by the surface discharge between the sustain electrode pairs 114 and 116. In this case, as shown in FIG. 6, the current density during the surface discharge is strongly generated between the auxiliary metal electrodes 114C and 116C at the center of the discharge cell and gradually expands toward the metal electrodes 114B and 116B located outside the discharge cell. . In addition, as shown in FIG. 7, the discharge is strongly generated between the auxiliary metal electrodes 114C and 116C at the center of the discharge cell and gradually expands toward the metal electrodes 114B and 116B located outside the discharge cell. Accordingly, in the PDP cell, visible light is emitted to the outside of the cell by emitting the phosphor 128 by ultraviolet rays generated during sustain discharge. As a result, the PDP having cells displays an image. In this case, the PDP implements a gray scale required for displaying an image by adjusting the discharge sustain period of the cell, that is, the number of sustain discharges, according to the video data.

As described above, xenon (Xe) in the inert gas injected into the discharge space in the PDP according to the first embodiment of the present invention uses a vacuum ultraviolet ray generated when a change from the excited state to the ground state by the gas discharge phosphor 128 Will be excited. Accordingly, as the content of xenon (Xe) included in the inert gas increases, the amount of vacuum ultraviolet rays generated during gas discharge in the discharge space increases, thereby increasing the efficiency of the PDP. However, an increase in the content of xenon (Xe) becomes a factor of increasing the discharge start voltage and the discharge sustain voltage between the sustain electrode pairs 114 and 116.

As such, even if the content of xenon (Xe) in the inert gas is increased, the PDP according to the first embodiment of the present invention can improve the brightness and discharge efficiency by reducing the discharge start voltage and the discharge holding voltage during discharge. In detail, since the PDP according to the first embodiment of the present invention has a close distance between the auxiliary metal electrodes 114C and 116C, a strong electric field may be generated at the center of the discharge cell during discharge. Due to the strong electric field in the center of the discharge cell, the discharge start voltage and the discharge sustain voltage are reduced. Therefore, the luminance of the PDP according to the first embodiment of the present invention is improved by up to 57% compared to the conventional PDP when the discharge voltage is 260V, as shown in FIG. 8, and the efficiency is discharge voltage as shown in FIG. At 200V, it is about 39% better than the conventional PDP.

Meanwhile, referring to FIG. 10, other components except for the sustain electrode pairs 214 and 216 that are sequentially formed on the upper substrate of the PDP according to the second embodiment of the present invention are shown in FIG. 3. Since it is the same as each component of the PDP according to the embodiment, a description thereof will be omitted.

Each of the sustain electrode pairs 214 and 216 has a relatively wide width and has a stripe-shaped transparent electrode 214A and 216A made of transparent electrode material (ITO) to transmit visible light, and has a relatively narrow width and transparency. In order to compensate for the resistive components of the electrodes 214A and 216A, the metal electrodes 214B and 216B and a plurality of auxiliary metal electrodes 214C and 216C are arranged in at least two rows. At this time, the transparent electrodes 214A and 216A of the sustain electrode pairs 214 and 216 face each other with a predetermined gap therebetween.

Each of the metal electrodes 214B and 216B of the sustain electrode pairs 214 and 216 is formed at one edge of each of the transparent electrodes 214A and 216A.

Each of the plurality of auxiliary metal electrodes 214C and 216C is formed in a first row and a second row on the side of each of the transparent electrodes 214A and 216A facing each other and is formed side by side at equal intervals as shown in FIG. 11. .

Each of the plurality of auxiliary metal electrodes 214C and 216C receives a discharge voltage supplied from the metal electrodes 214B and 216B through the transparent electrodes 214A and 216A when discharging, thereby strengthening an electric field applied to the discharge space. Will induce a discharge. Accordingly, each of the plurality of auxiliary metal electrodes 214C and 216C reduces the discharge start voltage and the sustain voltage by inducing a strong electric field in the center of the discharge cell.

The PDP cell of this structure is selected by the counter discharge between the address electrode and the scan electrode 214 and then sustains the discharge by the surface discharge between the sustain electrode pairs 214 and 216. At this time, as shown in FIG. 6, the current density is strongly generated between the auxiliary metal electrodes 214C and 216C at the center of the discharge cell and gradually expands toward the metal electrodes 214B and 216B located outside the discharge cell. . In addition, as shown in FIG. 7, the discharge is strongly generated between the auxiliary metal electrodes 214C and 216C at the center of the discharge cell, and gradually expands toward the metal electrodes 214B and 216B located outside the discharge cell. Accordingly, in the PDP cell, the fluorescent material emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted outside the cell. As a result, the PDP having cells displays an image. In this case, the PDP implements a gray scale required for displaying an image by adjusting the discharge sustain period of the cell, that is, the number of sustain discharges, according to the video data.

As described above, xenon (Xe) in the inert gas injected into the discharge space in the PDP according to the second embodiment of the present invention causes the phosphor to be excited by using the vacuum ultraviolet rays generated when changing from the excited state to the ground state by the gas discharge. do. Accordingly, as the content of xenon (Xe) included in the inert gas increases, the amount of vacuum ultraviolet rays generated during gas discharge in the discharge space increases, thereby increasing the efficiency of the PDP. However, an increase in the content of xenon (Xe) becomes a factor of increasing the discharge start voltage and the discharge sustain voltage between the sustain electrode pairs 214 and 216.

As such, even if the content of xenon (Xe) in the inert gas is increased, the PDP according to the second embodiment of the present invention can improve the brightness and discharge efficiency by reducing the discharge start voltage and the discharge holding voltage during discharge. In detail, since the distance between the plurality of auxiliary metal electrodes 214C and 216C arranged in at least two rows is close, the PDP according to the second embodiment of the present invention can generate a strong electric field in the center of the discharge cell during discharge. Due to the strong electric field in the center of the discharge cell, the discharge start voltage and the discharge sustain voltage are reduced. Therefore, the luminance of the PDP according to the second embodiment of the present invention is improved by up to 57% compared to the conventional PDP when the discharge voltage is 260V, as shown in Figure 8, the efficiency is discharge voltage as shown in Figure 9 At 200V, it is about 39% better than the conventional PDP.

On the other hand, referring to FIG. 12, each of the auxiliary metal electrodes 314C and 316C of the sustain electrode pairs 314 and 316 is zigzag on each transparent electrode 314A and 316A in the PDP according to the third embodiment of the present invention. It may be formed in the form.

As described above, the plasma display panel according to the exemplary embodiment of the present invention is disposed at side edges of the transparent electrodes parallel to the metal electrodes, which are formed in parallel with the transparent electrodes, and are disposed on the sides facing each other at equal intervals. The auxiliary metal electrodes are formed. Accordingly, the present invention can improve the brightness and efficiency by inducing a strong discharge by strengthening the electric field in the center of the discharge cell applied in the discharge space due to the auxiliary metal electrode formed on the transparent electrode so as to be close to the center of the discharge cell. .

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 (7)

Transparent electrodes spaced apart by a predetermined distance, Metal electrodes formed at one side edge of each of the transparent electrodes to be biased toward opposite sides of the sides facing each other; Each of the transparent electrodes includes auxiliary metal electrodes formed between the opposite sides from the center in the width direction of the transparent electrode, And the auxiliary metal electrodes are arranged in at least two rows at equal intervals in a zigzag form. delete delete delete delete delete The method of claim 1, And the auxiliary metals are rectangular.

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