KR20040083801A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve stability of a discharge and achieve improved brightness and efficiency in the plasma display panel. CONSTITUTION: A plasma display panel comprises transparent electrodes(114A,116A) spaced apart from each other, and metal electrodes(114B,116B) formed at the transparent electrodes. The metal electrodes are formed between the opposite sides from a center of a width direction of the transparent electrodes and are spaced apart form the opposite side of the transparent electrodes.

Description

Plasma Display Panel {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 that can improve brightness and efficiency, as well as discharge stability.

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. ) Is provided with 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.

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 sustain electrode pairs 14 and 16 are composed of a scan electrode and a sustain electrode. The scan signal for the panel scan and the sustain signal for maintaining the discharge are mainly supplied to the scan electrode 14, and the sustain signal is mainly supplied to the sustain electrode 16.

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 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. In addition, an increase in xenon (Xe) content increases discharge instability such as an increase in discharge delay time.

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, in the conventional PDP, a discharge delay time is generated due to a high discharge start voltage and a discharge sustain voltage, thereby causing unstable discharge, thereby reducing luminance and efficiency.

Accordingly, an object of the present invention is to provide a plasma display panel which can improve brightness and efficiency, as well as discharge stability.

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.

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

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

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

8A is a plan view illustrating a sustain electrode pair according to a third embodiment of the present invention.

FIG. 8B is a cross-sectional view taken along the line AA ′ of FIG. 8A;

<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

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, and metal electrodes formed on each of the transparent electrodes so as to be biased toward opposite sides of each of the transparent electrodes. It is characterized by including.

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

Each of the metal electrodes of the plasma display panel may be spaced apart from each other by a predetermined distance from opposite sides of the transparent electrodes.

Each of the metal electrodes of the plasma display panel may be formed toward the center of the width direction of the transparent electrode from opposite sides of the transparent electrodes.

A portion of each of the metal electrodes in the plasma display panel overlaps sides of the transparent electrodes facing each other.

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 8B.

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 including 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.

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) for transmitting visible light, and has a relatively narrow width and transparency. The metal electrodes 114B and 116B are formed to compensate for the resistive components of the electrodes 114A and 116A. 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. In addition, each of the metal electrodes 114B and 116B of the sustain electrode pairs 114 and 116 has a transparent electrode 114A between the center of each of the transparent electrodes 114A and 116A and the center of the discharge cell Pc. , 116A). That is, each of the metal electrodes 114B and 116B is formed on each of the transparent electrodes 114A and 116A such that the transparent electrodes 114A and 116A are biased toward opposite sides. In this case, the center of the discharge cell is Pc, the distance between the center of each of the transparent electrodes 114A and 116A and Pc is d1, and the distance between each center of the metal electrodes 114B and 116B and Pc is d2. Is assumed to be smaller than d1 / 2.

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 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 the PDP cell, the fluorescent substance 128 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted to the outside of 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 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. In addition, an increase in xenon (Xe) content increases discharge instability such as an increase in discharge delay time.

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 reduce the discharge start voltage and the discharge holding voltage during discharge, and reduce the discharge delay time to ensure the stability of the discharge. It will be possible to improve. In detail, since the PDP according to the first embodiment of the present invention has a close distance between the metal electrodes 114B and 116B, 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. Accordingly, the luminance of the PDP according to the first embodiment of the present invention is improved by approximately 40% to 60% compared to the conventional PDP with the same discharge voltage as shown in FIG. 5, and the efficiency is the same as shown in FIG. 6. The discharge voltage is improved by 40% to 60% compared to the conventional PDP. In addition, the PDP according to the first embodiment of the present invention can improve the stability of the discharge by reducing the discharge start voltage and the discharge delay time.

Meanwhile, referring to FIG. 7, 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, the following description will be omitted.

The sustain electrode pairs 214 and 216 include transparent electrodes 214A and 216A and metal electrodes 214B and 216B formed at ends of the transparent electrodes 214A and 216A adjacent to the discharge cell center Pc.

Each of the metal electrodes 214B and 216B is formed toward the central portion of each of the transparent electrodes 214A and 216A from the side facing each of the transparent electrodes 214A and 216A. Accordingly, the distance between the metal electrodes 214B and 216B in the PDP according to the second embodiment of the present invention is closer to that of the PDP according to the first embodiment of the present invention. Therefore, a strong electric field is induced in the center portion Pc of the discharge cell during the plasma discharge.

As described above, since the PDP according to the second embodiment of the present invention has a close distance between the metal electrodes 214B and 216B, a strong electric field can 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. Accordingly, the luminance of the PDP according to the second embodiment of the present invention is improved by about 40% to 60% compared to the conventional PDP with the same discharge voltage as shown in FIG. 5, and the efficiency is the same as shown in FIG. 6. The discharge voltage is improved by 40% to 60% compared to the conventional PDP. In addition, in the PDP according to the second embodiment of the present invention, the discharge start voltage is reduced and the discharge delay time is reduced, thereby improving the stability of the discharge.

8A and 8B, other components except for the sustain electrode pairs 314 and 316 sequentially formed on the upper substrate of the PDP according to the third embodiment of the present invention are illustrated in FIG. 3. Since it is the same as each component of the PDP according to the first embodiment of the present invention described below it will be omitted.

The sustain electrode pairs 314 and 316 include transparent electrodes 314A and 316A, and metal electrodes 314B and 316B partially overlapped at ends of the transparent electrodes 314A and 316A adjacent to the discharge cell center Pc. .

Each of the metal electrodes 314B and 316B is formed such that a part of the metal electrodes 314B and 316B overlap each other at the opposite sides of the transparent electrodes 314A and 316A. That is, some of the metal electrodes 314B and 316B overlap at the ends of the transparent electrodes 314A and 316A adjacent to the center of the discharge cell Pc, and the rest of the metal electrodes 314B and 316B are formed in the center of the discharge cell Pc.

Accordingly, the distance between the metal electrodes 314B and 316B in the PDP according to the third embodiment of the present invention is formed closer to that of the PDP according to the first and second embodiments of the present invention. Therefore, a strong electric field is induced in the center portion Pc of the discharge cell during the plasma discharge.

As described above, since the PDP according to the third embodiment of the present invention has a close distance between the metal electrodes 214B and 216B, it is possible to 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. Accordingly, the luminance of the PDP according to the third embodiment of the present invention is improved by approximately 40% to 60% compared to the conventional PDP with the same discharge voltage as shown in FIG. 5, and the efficiency is the same as shown in FIG. 6. The discharge voltage is improved by 40% to 60% compared to the conventional PDP. In addition, the PDP according to the third embodiment of the present invention can improve the stability of the discharge by reducing the discharge start voltage and the discharge delay time.

As described above, the plasma display panel according to the embodiment of the present invention includes metal electrodes formed on the transparent electrodes so as to be close to the center of the discharge cell. Accordingly, the present invention can generate a strong electric field in the center of the discharge cell during discharge because the distance between the metal electrodes is close. Accordingly, the present invention can reduce the discharge start voltage and the discharge holding voltage due to the strong electric field generated in the center of the discharge cell during discharge. Therefore, the present invention can improve the brightness and efficiency, and the discharge delay time is reduced due to the reduction of the discharge start voltage, thereby improving the stability of the discharge.

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 (5)

Transparent electrodes spaced apart by a predetermined distance, And metal electrodes formed on each of the transparent electrodes so as to be biased toward opposite sides of each of the transparent electrodes. The method of claim 1, And the metal electrodes are formed between the opposite sides from the center in the width direction of the transparent electrode. The method of claim 2, Each of the metal electrodes is spaced apart from each other by a predetermined distance from the sides facing each other of the transparent electrodes. The method of claim 2, And each of the metal electrodes is formed toward the center of the width direction of the transparent electrode from opposite sides of the transparent electrodes. The method of claim 1, A portion of each of the metal electrodes overlaps sides of the transparent electrodes facing each other.