KR100739040B1 - A plasma display panel - Google Patents

Abstract

Plasma display panel of the present invention is to reduce the unit light at a low gradation, to improve the discharge stability and to reduce the reflection brightness, and is disposed between the back substrate and the front substrate, which is disposed at a predetermined interval between the two substrates discharged A partition wall partitioning cells, red, green, and blue phosphor layers formed on the discharge cells, an address electrode formed on the rear substrate in a first direction to correspond to the discharge cells, and the first direction; And first and second electrodes extending in the second direction crossing each other and formed on the front substrate in correspondence with the discharge cells. Each of the first electrode and the second electrode includes a transparent electrode protruding from the outside of the discharge cell to the center and a bus electrode connecting the transparent electrodes neighboring in the second direction. The bus electrode may include a protrusion protruding from the discharge cell of at least one color of the red, green, and blue discharge cells.

Bus electrode, transparent electrode, protrusion, extension part

Description

Plasma Display Panel {A PLASMA DISPLAY PANEL}

1 is a perspective view schematically illustrating an exploded view of a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a plan view illustrating an arrangement relationship between a partition and an electrode in FIG. 1.

3 is a cross-sectional view taken along line III-III of FIG. 2.

4 is a plan view showing an arrangement relationship between a partition and an electrode according to a second exemplary embodiment of the present invention.

5 is a plan view showing an arrangement relationship between a partition and an electrode according to a third embodiment of the present invention.

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 realizes reduction of unit light, improvement of discharge stability, and reduction of reflection luminance by changing shape of a bus electrode.

In general, a plasma display panel is a display device that implements an image by using a gas discharge phenomenon, and has excellent display capability such as display capacity, brightness, contrast, afterimage, and viewing angle.

The plasma display panel is formed by enclosing a front substrate and a rear substrate with a partition wall partitioning discharge cells therebetween. The front substrate includes a sustain electrode and a scan electrode corresponding to the discharge cell, and the back substrate has an address electrode corresponding to the discharge cell and disposed to intersect the sustain electrode and the scan electrode.

In this discharge cell, a discharge gas (for example, a mixed gas of neon Ne and xenon) is filled, and phosphor layers each formed of phosphors generating red, green, or blue visible light are formed. .

The plasma display panel selects a discharge cell which is turned on by an address discharge by an address pulse applied to the address electrode and a scan pulse applied to the scan electrode, and in this state, the discharge cell selected by the sustain pulse applied to the sustain electrode and the scan electrode. The image is realized by the sustain discharge in the chamber.

In other words, the sustain discharge generates vacuum ultraviolet rays, which excite the phosphors in the discharge cells. The excited phosphors stabilize and generate red, green, or blue visible light, respectively, and the visible light implements an image.

According to the plasma display panel, a gradation, which is a degree of brightness gradually changing from the minimum brightness (low gradation) to the maximum brightness (high gradation), is expressed by the number of sustain pulses applied to the sustain electrode and the scan electrode. In order to express more detailed gray scales, it is required that the unit light indicating the minimum brightness is low.

It is an object of the present invention to provide a plasma display panel which reduces unit light at low gradation.

In addition, another object of the present invention is to provide a plasma display panel which improves discharge stability and reduces reflection brightness.

Plasma display panel according to an embodiment of the present invention, the rear substrate and the front substrate which are disposed facing each other at a predetermined interval, the partition wall disposed between the two substrates to partition the discharge cells, red formed in the discharge cells, A green and blue phosphor layer, an address electrode extending in a first direction on the rear substrate and corresponding to the discharge cells, and extending in a second direction crossing the first direction, respectively, to correspond to the discharge cells; And a first electrode and a second electrode formed on the front substrate. Each of the first electrode and the second electrode may include a transparent electrode protruding from the outside of the discharge cell to the center and a bus electrode connecting the transparent electrodes neighboring in the second direction. The bus electrode may include protrusions protruding from the discharge cells of at least one color of the red, green, and blue discharge cells.

The protrusion may be provided in the green discharge cell. The protrusion may be located on the transparent electrode together with the bus electrode. The protrusion may be formed of an opaque metal together with the bus electrode.

The protrusion may be located at an intermediate portion of the second direction on the transparent electrode. The protrusion may be formed in a symmetrical structure in the second direction with respect to the first direction.

The protrusion may include a first protrusion provided in the green discharge cell, a second protrusion provided in the red discharge cell, and a third protrusion provided in the blue discharge cell.

The first protrusion may be formed to have a larger area than the second protrusion and the third protrusion. The second protrusion may be formed to have a larger area than the third protrusion.

The first protrusion, the second protrusion, and the third protrusion may be positioned at an intermediate portion of the second direction on the transparent electrode.

The first protrusion, the second protrusion, and the third protrusion may be formed in a symmetrical structure in the second direction with respect to the first direction.

The first protrusion, the second protrusion, and the third protrusion are formed in the same area, and include a first extension part provided at the end of the first protrusion, a second extension part provided at the end of the second protrusion, and the third protrusion. It may include a third extension provided on the end of the projection.

The first extension part may have a larger area than the second extension part and the third extension part. The second extension part may have a larger area than the third extension part.

The first extension part, the second extension part, and the third extension part may be positioned in an intermediate portion of the second direction on the transparent electrode.

The first extension part, the second extension part, and the third extension part may be formed in a symmetrical structure in the second direction with respect to the first direction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a perspective view schematically illustrating an exploded view of a plasma display panel according to a first embodiment of the present invention.

Referring to this drawing, the plasma display panel according to the first embodiment is disposed between the rear substrate 10 and the front substrate 20 and the substrates 10 and 20 which are disposed to face each other at predetermined intervals and are sealed to each other. The partition 16 is included. The partition 16 is formed at a predetermined height between the rear substrate 10 and the front substrate 20 to partition the plurality of discharge cells 17. The discharge cells 17 are filled with a discharge gas (for example, a mixed gas including neon (Ne), xenon (Xe), etc.) so as to generate a vacuum ultraviolet ray by gas discharge, and absorbs the vacuum ultraviolet ray A phosphor layer 19 for emitting visible light is provided.

The plasma display panel includes an address electrode 11 corresponding to each discharge cell 17, a first electrode 31 (hereinafter referred to as a "holding electrode"), and a second electrode 32 corresponding to each discharge cell 17 in order to implement an image by gas discharge. Hereinafter referred to as "scanning electrode".

The address electrode 11 extends along the first direction (y-axis direction in the drawing) on the inner surface of the back substrate 10 to continuously discharge cells 17 adjacent to the y-axis direction. Corresponds. In addition, the plurality of address electrodes 11 are arranged side by side to correspond to the discharge cells 17 adjacent to each other in the second direction (the x-axis direction of FIG. 1) crossing the y-axis direction.

The address electrodes 11 are covered with a dielectric layer 13 covering the inner surface of the back substrate 10 as described above. The dielectric layer 13 prevents cations or electrons from directly colliding with the address electrode 11 during discharge, thereby preventing damage to the address electrode 11, and also forms and accumulates wall charges. Since the address electrode 11 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 11 may be formed of a metal electrode having excellent electrical conductivity.

The partition 16 is actually provided on the dielectric layer 13 to partition the discharge cells 17. The partitions 16 extend in the y-axis direction, and the plurality of partitions 16 are arranged side by side in the x-axis direction to form a stripe structure of the discharge cells 17. In addition, the partition wall may further include a partition wall extending in the x-axis direction between the partitions 16 extending in the y-axis direction to form discharge cells in a matrix structure (not shown).

Phosphor layer 19 formed in the discharge cells 17 is applied to the surface of the dielectric layer 13 located between the side wall of the partition wall 16 and the adjacent partition wall 16 in the x-axis direction, It is formed by baking this.

The phosphor layer 19 is formed of phosphors of the same color in the discharge cells 17 formed along the y-axis direction. In addition, the phosphor layer 19 is formed of red, green, and blue phosphors respectively formed by red (R), green (G), and blue (B) phosphors in the discharge cells 17 repeatedly disposed along the x-axis direction. Layers 19R, 19G, 19B.

This phosphor has a unique characteristic, so that the green discharge cell 17G with the green phosphor layer 19G is provided with the red or blue discharge cells 17R, 17B with the red or blue phosphor layers 19R, 19B. Compared with), the luminance and the unit light are high. In addition, the red phosphor layer 19R has higher luminance and unit light than the blue phosphor layer 19B.

On the other hand, the sustain electrode 31 and the scanning electrode 32 are provided on the inner surface of the front substrate 20, the surface discharge structure corresponding to each discharge cell 17 to cause gas discharge in the discharge cells 17 To form. The sustain electrode 31 and the scan electrode 32 extend in the x-axis direction crossing the address electrode 11 (see Fig. 2).

Each of the sustain electrodes 31 and the scan electrodes 32 includes transparent electrodes 31a and 32a for generating a discharge and bus electrodes 31b and 32b for applying a voltage signal to the transparent electrodes 31a and 32a. do. The transparent electrodes 31a and 32a are surface discharges in the discharge cells 17 and are formed of a transparent material (for example, indium tin oxide (ITO)) to secure the aperture ratio of the discharge cells 17. The bus electrodes 31b and 32b are formed of a metal material having excellent electrical conductivity to compensate for the high electrical resistance of the transparent electrodes 31a and 31a. Since the bus electrodes 31b and 32b are opaque, some of the visible light generated in the discharge cells 17 are blocked.

The transparent electrodes 31a and 32a are protruded from the outside of the discharge cell 17 along the y-axis direction to form a surface discharge structure, and the discharge gap G is formed at the center of each discharge cell 17. Form. The bus electrodes 31b and 32b extend in the x-axis direction from the outside of the discharge cell 17 to connect the transparent electrodes 31a and 32b arranged in the x-axis direction. Therefore, when the voltage signal is applied to the bus electrodes 31b and 32b, the voltage signal is applied to the transparent electrodes 31a and 32a connected to the respective bus electrodes 31b and 32b.

The transparent electrodes 31a and 32a have grooves 31aa and 32aa facing each other at the center of the discharge cell 17, respectively. Accordingly, the discharge gap G forms the long gap GL between the corresponding grooves 31aa and 32aa, and forms the short gap GS outside the grooves 31aa and 32aa. Since the short gap GS portion causes initial discharge and the long gap GL portion causes full discharge, sustain discharge by low voltage is possible.

The bus electrodes 31b and 32b have a two-layer structure of white layers 31bw and 32bw and black layers 31bb and 32bb, and black layers 31bb and 32bb are disposed on the inner surface of the front substrate 20. This reduces reflection brightness and improves contrast (see Fig. 3).

In addition, the bus electrodes 31b and 32b have projections 31c and 32c in the green discharge cells 17B. These projections 31c and 32c protrude from the outer edge of the discharge cell 17B along the y-axis direction to the center. These projections 31c and 32c are connected to the bus electrodes 31b and 32b and are formed of an opaque metal on the transparent electrodes 31a and 32a.

The projections 31c and 32c formed in the green discharge cell 17B block a part of the visible light generated in the green discharge cell 17B to reduce the luminance and the unit light in the green discharge cell 17B. Therefore, in the module including the plasma display panel, it is not necessary to reduce the green luminance for white balance, and the color temperature is improved.

These projections 31c and 32c are formed in a two-layer structure made of the same material as the bus electrodes 31b and 32b. In this case, the protrusions 31c and 32c may be manufactured by forming the bus electrodes 31b and 32b without additional processes.

In addition, the projections 31c and 32c increase the black ratio of the panel since the black layers 31cb and 32cb are provided on the transparent electrodes 31a and 32a among the white layers 31cw and 32cw and the black layers 31cb and 32cb. To reduce reflection brightness and improve contrast.

In addition, since the projections 31c and 32c are formed integrally with the bus electrodes 31b and 32b, the contact area between the bus electrodes 31b and 32b and the transparent electrodes 31a and 32a is increased. The green discharge cells 17G have lower discharge stability than the red or blue discharge cells 17R and 17B. Therefore, the signal voltages applied to the bus electrodes 31b and 32b are applied to the transparent electrodes 31a and 32a while passing through a minimum voltage drop by the protrusions 31c and 32c, thereby improving discharge stability.

These projections 31c and 32c are located in the middle portion on the transparent electrodes 31a and 32a along the x-axis direction. That is, the projections 31c and 32c form a symmetrical structure in the x-axis direction about the y-axis direction. As a result, a more uniform voltage is applied to the transparent electrodes 31a and 32a along the x-axis direction. That is, uniform discharge occurs in the x-axis direction in the green discharge cell 17B.

The sustain electrode 31 and the scan electrode 32 are covered with the dielectric layer 21 while crossing the address electrodes 11 and facing each other corresponding to the discharge cells 17. The dielectric layer 21 forms and accumulates wall charges during discharge while protecting the sustain electrode 31 and the scan electrode 32 from gas discharge.

This dielectric layer 21 is covered with a protective film 23. The protective film 23 is formed of transparent MgO to protect the dielectric layer 21, thereby increasing the secondary electron emission coefficient upon discharge.

In this plasma display panel, a reset discharge is generated by a reset pulse applied to the scan electrode 31 in the reset period, and the scan pulse and the address electrode 11 applied to the scan electrode 32 in the addressing period following the reset period. The address discharge is caused by the address pulse applied to the sustain pulse, and then the sustain discharge is caused by the sustain pulse applied to the sustain electrode 31 and the scan electrode 32 in the sustain period.

The sustain electrode 31 and the scan electrode 32 serve as electrodes for applying sustain pulses required for sustain discharge, and the scan electrodes 32 serve as electrodes for applying reset pulses and scan pulses, and the address electrodes. Reference numeral 11 serves as an electrode for applying an address pulse. These electrodes 31, 32, and 11 may differ in their roles according to voltage waveforms applied to the electrodes 31, 32, and 11, but are not necessarily limited to these roles.

The plasma display panel selects a discharge cell 17 to be turned on by the address discharge due to the interaction between the address electrode 11 and the scan electrode 32, and the interaction between the sustain electrode 31 and the scan electrode 32. The selected discharge cell 17 is driven by sustain discharge, thereby realizing an image.

4 is a plan view showing an arrangement relationship between a partition and an electrode according to a second exemplary embodiment of the present invention.

Since the second embodiment has a similar or the same configuration as compared with the first embodiment as a whole, different parts from the first embodiment will be described in detail.

The first embodiment includes the projections 31c and 32c only in the green discharge cell 17B, whereas the second embodiment includes the first projections 131c and 132c in the green discharge cell 17G and the red discharge. The second protrusions 231c and 232c are provided in the cell 17R, and the third protrusions 331c and 332c are provided in the blue discharge cell 17B.

That is, the first embodiment controls the visible light in the green discharge cells 17B and does not differentiate the red and blue discharge cells 17R and 17B. On the other hand, the second embodiment controls all the visible light by differentiating all of the green, red, and blue (17G, 17R, 17B) to enable finer control than the first embodiment.

The first protrusions 131c and 132c have a larger area than the second protrusions 231c and 232c and the third protrusions 331c and 332c. In addition, the second protrusions 231c and 232c have a larger area than the third protrusions 331c and 332c.

The luminance and unit light are gradually lowered in the same order as the green, red, and blue discharge cells 17G, 17R, and 17B. Therefore, the area size order as described above blocks the most visible light in the green discharge cell 17G having high luminance and unit light, and blocks the least visible light in the blue discharge cell 17B. That is, since the luminance and the unit light are differentially reduced, it is not necessary to reduce the luminance of the green discharge cells 17G and the red discharge cells 17R for the white balance as compared with the first embodiment, thereby further improving the color temperature.

In addition, the first protrusions 131c and 132c, the second protrusions 231c and 232c, and the third protrusions 331c and 332c increase the black ratio of the panel to reduce reflection brightness and improve contrast, and the bus electrode 31b. , 32b) and the contact area between the transparent electrodes 31a and 32a is increased. The green discharge cells 17G have a lower discharge stability than the red discharge cells 17R, and the red discharge cells 17R have a lower discharge stability than the blue discharge cells 17B. Therefore, the signal voltage applied to the bus electrodes 31b and 32b passes through voltage drops that are sequentially increased by the first protrusions 131c and 132c, the second protrusions 231c and 232c, and the third protrusions 331c and 332c. Since the green, red, and blue discharge cells 17G, 17R, and 17B are sequentially applied to the transparent electrodes 31a and 32a, the discharge stability is improved.

The first protrusions 131c and 132c, the second protrusions 231c and 232c, and the third protrusions 331c and 332c are intermediate portions in the x-axis direction on the transparent electrodes 31a and 32a as in the first embodiment. And formed in a symmetrical structure along the x-axis direction about the y-axis direction. As a result, a more uniform voltage is applied to the transparent electrodes 31a and 32a along the x-axis direction. That is, uniform discharge occurs in the x-axis direction in the green, red, and blue discharge cells 17B, 17R, and 17B.

5 is a plan view showing an arrangement relationship between a partition and an electrode according to a third embodiment of the present invention.

Since the third embodiment has a similar or the same configuration as a whole compared with the second embodiment, a part different from the second embodiment will be described in detail.

The second embodiment includes the first protrusions 131c and 132c, the second protrusions 231c and 232c, and the third protrusions 331c and 332c having different areas. In contrast, the third embodiment includes the first projections 431c and 432c, the second projections 531c and 532c and the third projections 631c and 632c having the same area. 1 extension part 431d, 432d, and 2nd extension part 531d, 532d at the end of 2nd protrusion 531c, 532c, and 3rd extension part 631d, at the end of 3rd protrusion 631c, 632c. 632d).

The third embodiment forms different areas of these extensions in order to obtain the same operational effects as the second embodiment. That is, the first extension parts 431d and 432d are formed with a larger area than the second extension parts 531d and 532d, and the second extension parts 531d and 532d are larger than the third extension parts 631d and 632d. Is formed.

In addition, the first extension parts 431d and 432d, the second extension parts 531d and 532d, and the third extension parts 631d and 632d are positioned at an intermediate portion along the x-axis direction on the transparent electrodes 31a and 32a. And a symmetrical structure along the x-axis direction with respect to the y-axis direction.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the plasma display panel according to the present invention, among the red, green, and blue discharge cells, an opaque protrusion connected to the bus electrode is provided on the transparent electrode in a green discharge cell having a high luminance and a unit light. By blocking a part of the visible light generated in the green discharge cell, there is an effect of reducing the unit light of the entire plasma display panel, and decreases the reflected brightness by increasing the black fraction.

In addition, the area of the projection is made small in the order of the low discharge cells, that is, the green discharge cells, the red discharge cells, and the blue discharge cells in the order of the discharge cells having the high luminance and the unit light, and is generated in each color discharge cell. Since the blocking degree of visible light is made relatively small, there is an effect of reducing the unit light of the entire plasma display panel.

In addition, the protrusion has a wide contact area between the bus electrode and the transparent electrode, thereby improving the discharge stability of the discharge cells. In particular, the green discharge cell having low discharge stability compared to other color discharge cells has a large effect of improving discharge stability.

Claims (16)

A rear substrate and a front substrate disposed to face each other at a predetermined interval; Barrier ribs disposed between the rear substrate and the front substrate to partition discharge cells; Red, green, and blue phosphor layers formed on the discharge cells; An address electrode formed on the rear substrate in a first direction and corresponding to the discharge cells; And A first electrode and a second electrode extending in a second direction crossing the first direction and respectively formed on the front substrate in correspondence with the discharge cells; Each of the first electrode and the second electrode, A transparent electrode protruding from the outside of the discharge cell to the center and a bus electrode connecting the transparent electrodes neighboring to the second direction; The transparent electrode, A groove facing each other in the first direction from the center of the second direction with respect to the discharge cell; The bus electrode, In the discharge cells of at least one color of the red, green, and blue discharge cells each provided with the red, green, and blue phosphor layers, And a projection protruding toward the groove toward the center. According to claim 1, The protrusion is provided in the green discharge cell plasma display panel. According to claim 1, And the protrusion is disposed on the transparent electrode together with the bus electrode. According to claim 1, And the protrusion is formed of an opaque metal together with the bus electrode. According to claim 1, And the protrusion is positioned at an intermediate portion of the second direction on the transparent electrode. The method of claim 5, And the protrusions are formed in a symmetrical structure in the second direction with respect to the first direction. According to claim 1, The projection includes a first projection provided in the green discharge cell, a second projection provided in the red discharge cell, and a third projection provided in the blue discharge cell. The method of claim 7, wherein And the first protrusion is formed to have a larger area than the second and third protrusions. The method of claim 8, And the second protrusion is formed to have a larger area than the third protrusion. The method of claim 7, wherein Wherein the first protrusion, the second protrusion, and the third protrusion are positioned in an intermediate portion of the second direction on the transparent electrode. The method of claim 10, The first projection, the second projection, and the third projection are formed in a symmetrical structure in the second direction with respect to the first direction. The method of claim 7, wherein The first protrusion, the second protrusion, and the third protrusion are formed in the same area, And a first expansion part provided at the end of the first projection, a second expansion part provided at the end of the second projection, and a third extension part provided at the end of the third projection. The method of claim 12, And the first extension part has a larger area than the second extension part and the third extension part. The method of claim 13, And the second extension part has a larger area than the third extension part. The method of claim 12, And the first extension part, the second extension part, and the third extension part are positioned in an intermediate portion of the second direction on the transparent electrode. The method of claim 15, And the first extension part, the second extension part, and the third extension part are formed in a symmetrical structure in the second direction with respect to the first direction.

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