KR100456145B1 - Plasma Display Panel - Google Patents

Abstract

The present invention relates to a plasma display panel capable of lowering power consumption and preventing luminance decrease.

According to the present invention, a plasma display panel includes: a partition wall formed between an upper substrate and a lower substrate; A bus electrode formed on the upper substrate in a direction crossing the partition wall; A transparent electrode formed on the upper substrate to be connected to the bus electrode; An upper dielectric layer formed to cover the transparent electrode and the bus electrode; A protective film formed on the upper dielectric layer; An address electrode formed on the lower substrate to cross the transparent electrode, and a lower dielectric layer formed to cover the address electrode; A phosphor layer formed on the barrier rib and the lower dielectric layer, wherein the transparent electrode includes: a “T” shaped electrode pattern having a horizontal portion horizontal to the bus electrode and a vertical portion intersecting the horizontal portion; At least one barrier rib electrode pattern protruding toward the bus electrode from at least one of both sides of the horizontal portion and the vertical portion is provided.

Description

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 capable of lowering power consumption and preventing luminance decrease.

Recently, a plasma display panel (hereinafter referred to as "PDP"), which is easy to manufacture a large panel, has attracted attention as a flat panel display device. The PDP normally displays an image by adjusting the discharge period of each pixel according to the digital video data. As such a PDP, an AC type PDP having three electrodes and driven by an AC voltage is typical.

1 is a perspective view illustrating a cell structure typically arranged in an alternating current PDP in a matrix form, and FIG. 2 is a cross-sectional view of the PDP shown in FIG. 1.

1 and 2, a 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. Each of the sustain electrode pairs 14 and 16 has a relatively wide width and a relatively narrow transparent electrode 14A and 16A made of a transparent electrode material (ITO) having a light transmittance of 90% or more, as shown in FIG. It consists of bus electrodes 14B and 16B having a width. Here, the transparent electrode material (ITO) has a large resistance value and thus does not transmit power efficiently. Accordingly, the resistive components of the transparent electrodes 14A and 16A are formed on the transparent electrodes 14A and 16A by forming buses 14B and 16B made of a good conductive material, for example, silver (Ag) or copper (Cu). To compensate. The sustain electrode pairs 14 and 16 are composed of a scan sustain electrode and a common sustain electrode. The scan sustain electrode 14 is mainly supplied with a scan signal for panel scanning and a sustain signal for discharging sustain. 16, a sustain signal is mainly supplied. 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. 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.

The PDP cell is selected by the counter discharge between the address electrode 22 and the scan sustain 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.

The discharge efficiency of PDP is so good that the ratio of electrode area to cell area is small. In other words, when the ratio of the electrode area becomes smaller, the reactive power consumed for charging the capacitance between the electrodes becomes smaller. In addition, as the ratio of the electrode area decreases, the discharge current decreases, and as the discharge current decreases, the magnetic absorption of vacuum ultraviolet rays by the discharge gas decreases, thereby increasing the efficiency of exciting the phosphor.

Accordingly, as shown in FIG. 4, a PDP including a T-shaped transparent electrode has been proposed.

The sustain electrode pairs 14 and 16 of the PDP shown in FIG. 4 are composed of bus electrodes 14B and 16B formed in a stripe shape, and transparent electrodes 14A and 16A protruding from the respective bus electrodes 14B and 16B. do.

The bus electrodes 14B and 16B are located at both edges of the discharge cell and are formed of a highly conductive metal material such as silver (Ag) or copper (Cu). The transparent electrodes 14A and 16A have a relatively wider width than the bus electrodes 14B and 16B, have a T-shape, and face each other.

When the ratio of the area of the sustain electrode pairs 14 and 16 occupied by the transparent electrodes 14A and 16A to the area of the discharge cells is reduced, power consumption is reduced to improve luminous efficiency. However, since the discharge voltage is increased as the electrode area is reduced, the driving voltage margin is reduced, thereby reducing the luminance.

In order to solve this problem, a PDP having a high brightness and high efficiency shown in FIG. 5 has been proposed.

The PDP shown in FIG. 5 includes first and second trigger electrodes 30 and 32 formed on an upper substrate (not shown) so as to be positioned at the center of the discharge cell, and scan / formation formed on the upper substrate so as to be positioned at the edge of the discharge cell. The sustain electrode 14 and the common sustain electrode 16 are provided.

The trigger electrodes 30 and 32 formed at a narrow interval N in the center of the discharge cell are used to start sustain discharge by receiving an AC pulse during the sustain period. The scan / hold electrode 14 and the common sustain electrode 16 formed at a wide interval (W) at the edge of the discharge cell are supplied with an alternating pulse during the sustain period, and then discharge is started between the trigger electrodes 30 and 32. Used to maintain. That is, the scan / maintenance electrode 14 and the common sustain electrode are controlled by the priming effect while suppressing the increase of the discharge start voltage by primarily starting the discharge using the trigger electrodes 30 and 32 formed at a narrow interval N. The long discharge path between the (16) can cause sustain discharge. Thus, the amount of ultraviolet rays is increased, and the light emitting area is increased to improve the light emitting efficiency.

However, since the charged particles formed in the primary discharge are difficult to move to the sustain electrode pairs 14 and 16 for sustain discharge with a long discharge path, a high voltage must be applied to the sustain electrode pairs 14 and 16 for this purpose. There is a problem that increases.

In order to solve this problem, a PDP having a low voltage high brightness high efficiency structure shown in FIGS. 6A and 6B has been proposed.

The PDP shown in FIGS. 6A and 6B has a scan / hold electrode 14 having first and second bus electrodes 14B1 and 14B2 and a common sustain electrode having first and second bus electrodes 16B1 and 16B2. (16) is provided.

The first bridge electrode 34A connecting the first and second bus electrodes 14B1 and 14B2 of the scan / sustain electrode 14 to each other, and the first and second bus electrodes 16B1, A second bridge electrode 34B connecting 16B2 to each other is formed. The first and second bridge electrodes 34A and 34B are used in a trigger discharge occurring between the second bus electrode 14B2 of the scan / sustain electrode 14 and the first bus electrode 16B1 of the common sustain electrode 16. The charged particles can be easily moved to the first bus electrode 14B1 of the scan / hold electrode 14 and the second bus electrode 16B2 of the common sustain electrode 16. As a result, the long gap discharge effect can be obtained. In this case, PDPs of two or more bridge electrodes 34A and 34B shown in FIG. 6B have higher luminance and efficiency than PDPs of one bridge electrode shown in FIG. 6A. In addition, the area of the intersection between the address electrode (not shown) and the scan / hold electrode is also widened, so that address discharge easily occurs.

However, in order to form the plurality of bridge electrodes 34A and 34B shown in FIG. 6B, the electrodes are shorted because they are formed to have a relatively smaller width than when forming one bridge electrode.

Accordingly, it is an object of the present invention to provide a plasma display panel which can lower the power consumption and prevent luminance decrease.

1 is a perspective view showing a discharge cell of a conventional three-electrode AC surface discharge plasma display panel.

FIG. 2 is a cross-sectional view of the plasma display panel shown in FIG. 1. FIG.

3 is a plan view of the plasma display panel shown in FIG. 1;

4 is a plan view showing a plasma display panel having a conventional 'T' shaped transparent electrode.

5 is a plan view showing a plasma display panel having a conventional trigger electrode.

6A and 6B are plan views showing a plasma display panel having bridge electrodes.

7 is a perspective view illustrating a plasma display panel according to a first embodiment of the present invention.

8 is a plan view of the plasma display panel shown in FIG. 7;

9 is a plan view illustrating a plasma display panel according to a second embodiment of the present invention.

10 is a plan view illustrating a plasma display panel according to a third embodiment of the present invention.

11 is a plan view illustrating a plasma display panel according to a fourth embodiment of the present invention.

12 is a plan view illustrating a plasma display panel according to a fifth embodiment of the present invention.

13 is a plan view illustrating a plasma display panel according to a sixth embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10,40: upper substrate 12,42: lower substrate

14,44: scanning holding electrode 16,46: common holding electrode

18,48: upper dielectric layer 20,50: protective film

22, 52: address electrode 24, 54: lower dielectric layer

26,56: bulkhead 28,58: phosphor layer

In order to achieve the above object, the plasma display panel according to the present invention includes a partition wall formed between the upper substrate and the lower substrate; A bus electrode formed on the upper substrate in a direction crossing the partition wall; A transparent electrode formed on the upper substrate to be connected to the bus electrode; An upper dielectric layer formed to cover the transparent electrode and the bus electrode; A protective film formed on the upper dielectric layer; An address electrode formed on the lower substrate to cross the transparent electrode, and a lower dielectric layer formed to cover the address electrode; A phosphor layer formed on the barrier rib and the lower dielectric layer, wherein the transparent electrode includes: a “T” shaped electrode pattern having a horizontal portion horizontal to the bus electrode and a vertical portion intersecting the horizontal portion; And at least one partition electrode pattern protruding toward the bus electrode from at least one of both sides of the horizontal portion and the vertical portion.

The barrier rib electrode pattern may include two barrier rib electrode patterns protruding from both sides of the horizontal portion.

The two barrier rib electrode patterns may be disconnected or short-circuited with the bus electrode.

Any one of the barrier rib electrode patterns may have a rectangular shape.

The barrier rib electrode pattern protrudes from any one of "V" and "U" characters in the vertical portion, and is formed in one of diagonal and straight lines.

Other objects and advantages of the present invention in addition to the above object will be apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 7 to 13.

FIG. 7 is a perspective view illustrating a PDP according to a first embodiment of the present invention, and FIG. 8 is a plan view illustrating the PDP illustrated in FIG. 7.

7 and 8, a PDP according to the first embodiment of the present invention may include a pair of sustain electrodes 44 and 46, an upper dielectric layer 48, and a passivation layer 50 sequentially formed on an upper substrate 40. The upper plate has a lower plate having an address electrode 52, a lower dielectric layer 54, a partition wall 56, and a phosphor layer 58 sequentially formed on the lower substrate 42. The upper substrate 40 and the lower substrate 42 are spaced apart in parallel by the partition wall 56.

The upper dielectric layer 48 and the passivation layer 50 are stacked on the upper substrate 40 on which the sustain electrode pairs 44 and 46 are formed. Charges are accumulated in the upper dielectric layer 48 and the lower dielectric layer 54. The passivation layer 50 prevents damage to the upper dielectric layer 48 by sputtering, thereby increasing the lifetime of the PDP and increasing the emission efficiency of secondary electrons. As the protective film 50, magnesium oxide (MgO) is usually used.

The partition wall 56 is formed in parallel with the address electrode 52 to prevent ultraviolet rays generated by the discharge from leaking to adjacent cells. The phosphor layer 58 is applied to the surfaces of the lower dielectric layer 54 and the partition wall 56 to emit visible light of any one of red, green, and blue. Then, an inert gas for gas discharge is injected into the discharge space therein.

Each of the sustain electrode pairs 44 and 46 according to the first embodiment of the present invention includes transparent electrodes 44A and 46A and bus electrodes 44B and 46B.

The transparent electrodes 44A and 46A are formed of a 'T'-shaped electrode pattern 60A having a horizontal portion 63A and a vertical portion 63B, and a partition wall on both sides of the' T'-shaped electrode pattern 60A. The first and second partition direction electrode patterns 62A and 62B protrude in a direction parallel to 56 and are connected to the bus electrodes 44B and 46B. That is, the transparent electrodes 44A and 46A are formed in an 'E' shape. The transparent electrodes 44A and 46A are made of transparent electrode material (ITO) having good light transmittance of 90% or more.

The bus electrodes 44B and 46B are formed on the transparent electrodes 44A and 46A in the direction crossing the partition walls 56. The bus electrodes 44B and 46B are made of a highly conductive material such as silver (Ag) or copper (Cu) because the transparent electrodes 44A and 46A have a large resistance value and are unable to efficiently transfer power. Compensate for the resistive components of (14A, 16A).

The sustain electrode pairs 44 and 46 including the transparent electrodes 44A and 46A and the bus electrodes 44B and 46B are constituted by the scan sustain electrode 44 and the common sustain electrode 46. The scan signal for panel scanning and the sustain signal for discharging sustain are mainly supplied to the scan sustain electrode 44, and the sustain signal is mainly supplied to the common sustain electrode 46.

The transparent electrodes 44A and 46A of the scan sustaining electrode 44 and the common sustaining electrode 46 form partition wall electrode patterns 62A and 62B in the 'T'-shaped electrode pattern 60A, so that even at low discharge voltages. Discharge occurs between the sustain electrode pairs 44 and 46. In other words, the wall charges formed by the scan holding electrode 44 having the first and second partition wall electrode patterns 62A and 62B formed in the partition wall direction and the transparent electrodes 44A and 46A of the common holding electrode 46. They diffuse toward the bus electrodes 44B and 46B, so that long pass discharge of the sustain electrodes 44 and 46 occurs more easily. In other words, by lowering the discharge voltage, the power consumption is reduced and efficient discharge occurs.

The address electrode 52 is formed to intersect with the sustain electrode pairs 44 and 46. The scan pulse is supplied to the scan sustain electrode 44 at the time of address discharge, and the data pulse is applied to the address electrode 52 in synchronization with the scan sustain electrode 44 so that an address discharge occurs between the scan / sustain electrode 44 and the address electrode 52. Wall charges are formed on the lower dielectric layers 48 and 54.

In cells selected by the address discharge, sustain discharge occurs between the sustain electrode pairs 44 and 46. At this time, ultraviolet rays are generated in the process of transition after the discharge gas is excited in the discharge space. The generated ultraviolet rays excite the phosphor 58 to generate visible light, thereby implementing a PDP image.

In addition, the PDP according to the first embodiment of the present invention has the same address discharge characteristics as the cross-sectional area of the address electrode 52 and the scan / sustain electrode 44 is the same as that of the PDP having a 'T'-shaped electrode. .

9 is a plan view illustrating a PDP according to a second embodiment of the present invention.

Referring to FIG. 9, the first and second barrier rib electrode patterns 62A and 62B of the sustain electrode pairs 44 and 46 are not connected to the bus electrodes 44B and 46B as compared with the PDP shown in FIG. 8. Except that it has the same components.

Each of the sustain electrode pairs 44 and 46 includes transparent electrodes 44A and 46A and bus electrodes 44B and 46B.

The transparent electrodes 44A and 46A protrude in a direction parallel to the partition wall 56 on both sides of the 'T'-shaped electrode pattern 60A and the' T'-shaped electrode pattern 60A, and thus the bus electrodes 44B. And the first and second partition wall direction electrode patterns 62A and 62B which are not connected to the 46B. The transparent electrodes 44A and 46A are made of transparent electrode material (ITO) having good light transmittance of 90% or more.

The bus electrodes 44B and 46B are formed on the transparent electrodes 44A and 46A in the direction crossing the partition walls 56. The bus electrodes 44B and 46B are made of a highly conductive material such as silver (Ag) or copper (Cu) because the transparent electrodes 44A and 46A have a large resistance value and are unable to efficiently transfer power. Compensate for the resistive components of (14A, 16A).

The transparent electrodes 44A and 46A of the scan sustain electrode 44 and the common sustain electrode 46 are formed in the 'T'-shaped electrode pattern 60A in the direction of the partition wall 56 and the first and second partition wall direction electrode patterns. By forming 62A and 62B, discharge occurs between the sustain electrode pairs 44 and 46 even at a low discharge voltage. In other words, the wall charges formed by the transparent electrodes 44A and 46A having the first and second partition direction electrode patterns 62A and 62B in the same direction as the partition wall 56 are diffused toward the bus electrodes 44B and 46B. Long pass discharges of the sustain electrodes 44 and 46 occur more easily. In other words, by lowering the discharge voltage, the power consumption is reduced and efficient discharge occurs.

The transparent electrodes 44A and 46A of the PDP according to the first and second embodiments of the present invention are formed with three or more electrodes in a direction parallel to the partition wall 56. In this case, since the distance between the partition walls 56 is narrow, in order to form three or more electrodes, there is a problem that a very sophisticated technique is required in manufacturing.

10 is a plan view illustrating a PDP according to a third embodiment of the present invention.

Referring to FIG. 10, the same elements as those of the PDP shown in FIG. 8 except that the scan sustain electrode 44 and the common sustain electrode 46 of the PDP according to the third embodiment of the present invention are formed asymmetrically. It is provided.

The scan / hold electrode 44 has a bus electrode 44B and a 'T' shaped transparent electrode 44A protruding from the bus electrode 44B. The transparent electrode 44A is formed of one partition wall electrode pattern 60C protruding from the bus electrode 44B in a direction parallel to the partition wall 56.

The common holding electrode 46 has a bus electrode 46B and a 'c' shaped transparent electrode 46A protruding from the bus electrode 46B. The transparent electrode 46A is formed of two first and second partition wall direction electrode patterns 60A and 60B protruding from the bus electrode 46B in a direction parallel to the partition wall 56.

The transparent electrodes 44A and 46A of the sustain electrode pair are made of transparent electrode material (ITO) having good light transmittance of 90% or more. The bus electrodes 44B and 46B of the sustain electrode pair are made of a conductive material such as silver (Ag) or copper (Cu) because the transparent electrodes 44A and 46A do not transmit power efficiently due to their large resistance values. To compensate for the resistive components of the transparent electrodes 44A and 46A.

Since the scan sustain electrode 44 includes a conventional 'T' shaped transparent electrode, the area of the intersection between the scan sustain electrode 46 and the address electrode 52 is the same as in the related art, thereby maintaining the address discharge characteristics. The common holding electrode 46 is formed with two partition electrode patterns 60A and 60B to improve brightness and efficiency.

11 is a plan view illustrating a PDP according to a fourth embodiment of the present invention.

Referring to FIG. 11, the PDP according to the fourth embodiment of the present invention has a common holding electrode 46 having a 'U'-shaped transparent electrode 46A instead of the sustain electrode pair shown in FIG. 8, and a rectangular transparent shape. It has the same components as the PDP shown in FIG. 8 except for having the electrode 44A, i.e., the scan / hold electrode 44 having the '?' Shaped transparent electrode 44A.

The scan / hold electrode 44 has a bus electrode 44B and a '?'-Shaped transparent electrode 44A protruding from the bus electrode 44B. The scan sustain electrode 44 maintains the address discharge characteristic by the same cross-sectional area between the scan sustain electrode 44 and the address electrode 52 due to the '?'-Shaped transparent electrode 44A.

The common holding electrode 46 has a bus electrode 46B and a 'U'-shaped transparent electrode 46A protruding from the bus electrode 46B. The transparent electrode 46A is formed of two first and second partition wall direction electrode patterns 60A and 60B protruding from the bus electrode 46B in a direction parallel to the partition wall 56. As a result, brightness and efficiency are improved.

12 is a plan view illustrating a PDP according to a fifth embodiment of the present invention.

Referring to FIG. 12, the PDP according to the fifth embodiment of the present invention is a transparent electrode 44A and 46A in which a 'T' type and a 'U' shape are combined in place of a pair of sustain electrodes as compared to the PDP shown in FIG. 8. Except having the sustain electrode pair (44, 46) having the same component.

The PDP according to the fifth embodiment of the present invention forms two partition direction electrode patterns 60A and 60B in a direction parallel to the partition wall 56. As a result, the luminance can be increased.

In addition, the intersecting area between the scan sustain electrode 44 and the address electrode 52 can be secured to a certain degree by positioning the separation point of the partition direction electrode patterns 60A and 60B slightly downward.

13 is a plan view illustrating a PDP according to a sixth embodiment of the present invention.

Referring to FIG. 13, the PDP according to the sixth exemplary embodiment of the present invention has a sustain electrode pair 44 and 46 having 'V' shaped transparent electrodes 44A and 46A as compared to the PDP shown in FIG. 8. And the same components.

8 to 12, when the transparent electrodes 44A and 46A are formed in parallel with the partition walls 56, the manufacturing difficulties and charged particles generated at the electrodes close to the partition walls 56 diffuse into the partition walls 56. There is a problem that is lost. In order to solve this problem, the PDP according to the sixth embodiment of the present invention forms diagonal electrode pattern 60A, 60B formed in a direction parallel to the partition wall 56.

Accordingly, two partition electrode patterns 60A and 60B can be formed, and the positions thereof can be maintained at a predetermined distance from the partition wall 56, thereby improving luminance and efficiency, and reducing the loss of charged particles to the partition wall 56. have. In addition, the intersecting area between the scan sustain electrode 44 and the address electrode 52 can be secured to a certain degree by positioning the separation point of the partition direction electrode patterns 60A and 60B slightly downward.

As described above, the plasma display panel according to the present invention can improve brightness and efficiency by forming a plurality of electrodes in the partition wall direction to spread the charged particles generated in the discharge between the transparent electrodes to the bus electrodes. In addition, the address discharge easily occurs by securing a wide area of the intersection between the address electrode and the scan sustain electrode. In addition, the shape of the scan sustain electrode and the common sustain electrode may be different from each other to obtain a panel having high brightness and high efficiency with easy address 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 (8)

Barrier ribs formed between the upper substrate and the lower substrate; A bus electrode formed on the upper substrate in a direction crossing the partition wall; A transparent electrode formed on the upper substrate to be connected to the bus electrode; An upper dielectric layer formed to cover the transparent electrode and the bus electrode; A protective film formed on the upper dielectric layer; An address electrode formed on the lower substrate to intersect the transparent electrode; A lower dielectric layer formed to cover the address electrode; A phosphor layer formed on the barrier ribs and the lower dielectric layer; The transparent electrode A “T” shaped electrode pattern having a horizontal portion parallel to the bus electrode and a vertical portion intersecting the horizontal portion; And at least one partition electrode pattern protruding toward the bus electrode from at least one of both sides of the horizontal portion and the vertical portion. The method of claim 1, The barrier rib electrode pattern may include two barrier rib electrode patterns protruding from both sides of the horizontal portion. delete The method of claim 2, And the two barrier rib electrode patterns are disconnected or short-circuited with the bus electrode. The method of claim 1, The plasma display panel of claim 1, wherein any one of the barrier rib electrode patterns has a rectangular shape. The method of claim 1, And wherein the barrier rib electrode pattern protrudes from the vertical portion in one of “V” and “U” shapes and is formed in one of diagonal and straight lines. delete delete