KR100696630B1 - Plasma display panel - Google Patents

Abstract

The plasma display panel of the present invention lowers the initial addressing voltage to smoothly induce an address discharge and secures a wider addressing voltage margin. The plasma display panel includes a plurality of discharge spaces disposed to face each other at predetermined intervals. First and second substrates, a phosphor layer formed in the discharge spaces, and a first electrode connected in a first direction, each of which surrounds one of the substrate-side discharge spaces between the first and second substrates. A second electrode spaced apart from the first electrode along a vertical direction of the first substrate and the second substrate to surround discharge spaces of the other substrate, and connected along the first direction; and the first electrode; An address electrode is formed between the second electrodes and surrounds the discharge spaces and is connected in a second direction crossing the first direction. At a distance between the first substrate and the second substrate in the vertical direction, a first distance between the address electrode and the first electrode and a second distance between the address electrode and the second electrode are different in size. Can be formed.

Plasma, display, address electrode, dielectric layer, dielectric constant

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

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

4 is a perspective view showing an arrangement structure of electrodes.

5 is a cross-sectional view comparing the cross-sectional specifications of the sustain electrode, scan electrode, and address 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 which lowers initial addressing voltage to smoothly induce address discharge and secures a wider addressing voltage margin.

In general, a plasma display panel (PDP) has a three-electrode surface discharge type.

The three-electrode surface discharge plasma display panel includes a sustain electrode, a scan electrode and an address electrode. The sustain electrode and the scan electrode are provided side by side on the same surface of the front substrate, and the address electrode is provided on the back substrate in the direction crossing the sustain electrode and the scan electrode.

A partition wall is provided between the front substrate and the rear substrate, that is, between the sustain electrode and the scan electrode side and the address electrode side. The barrier ribs form a discharge space at a portion where the sustain electrodes and the scan electrodes arranged side by side intersect with the address electrodes. This discharge space is filled with discharge gas.

The plasma display panel selects a discharge space to be turned on by an address discharge by a scan pulse applied to the scan electrode and an address pulse applied to the address electrode, and a sustain pulse alternately applied to the sustain electrode and the scan electrode in the selected discharge space. The image is realized by the sustain discharge by.

Since the plasma display panel includes a sustain electrode and a scan electrode in front of the discharge space, a plasma discharge is generated at each inner surface of the sustain electrode and the scan electrode, and the plasma discharge is diffused to the rear substrate side. This plasma discharge excites the phosphor in the discharge space to generate visible light.

The sustain electrode and the scan electrode provided on the front substrate reduce the aperture ratio of the discharge space and reduce the transmittance of visible light generated in the discharge space and directed to the front substrate.

Therefore, the three-electrode surface discharge plasma display panel has low luminance or low luminous efficiency. When it is used for a long time, charged particles of the discharge gas cause ion sputtering on the phosphor by an electric field. This may cause permanent afterimages.

In order to solve this problem, each electrode needs to be formed on the side of the discharge space between the front substrate and the rear substrate. In addition, it is necessary to direct the charged particles of the discharge gas to the center of the discharge space during the address discharge by the address electrode and the scan electrode and the sustain discharge by the sustain electrode and the scan electrode.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel which improves the aperture ratio of a discharge space or the transmittance of visible light and improves luminance and luminous efficiency.

Another object of the present invention is to provide a plasma display panel which lowers the initial addressing voltage to smoothly induce address discharge and secures a wider addressing voltage margin.

Plasma display panel according to an embodiment of the present invention, the first substrate and the second substrate having a plurality of discharge spaces are disposed facing each other at a predetermined interval, between the phosphors formed in the discharge spaces A layer, between the first substrate and the second substrate, each of which surrounds one of the substrate-side discharge spaces and is connected in a first direction, the first electrode in a vertical direction of the first and second substrates; A second electrode spaced apart from an electrode and surrounding the other substrate-side discharge spaces, and connected along the first direction, and between the first electrode and the second electrode, respectively surrounding the discharge spaces and in the first direction. It may include an address electrode connected in a second direction crossing the.

At a distance between the first substrate and the second substrate in the vertical direction, a first distance between the address electrode and the first electrode and a second distance between the address electrode and the second electrode are different in size. Can be formed.

The second distance may be shorter than the first distance. The second electrode applies a scan pulse in the addressing period and a sustain pulse in the sustain discharge period.

The first electrode is buried in a first dielectric layer having a first dielectric constant, and the second electrode is buried in a second dielectric layer having a second dielectric constant different from the first dielectric constant.

The second dielectric constant may be greater than the first dielectric constant.

The address electrode may be embedded in the second dielectric layer.

Each of the first electrode and the second electrode may include a circular member surrounding the discharge space and a connection member connecting the circular members in the second direction.

The address electrode may include a circular member surrounding the discharge space and a connection member connecting the circular members in the first direction.

The circular member of the first electrode, the circular member of the address electrode, and the circular member of the second electrode may be spaced apart from each other along the vertical direction of the first substrate and the second substrate.

The first electrode, the second electrode, and the address electrode may be formed of a metal electrode.

The first dielectric layer and the second dielectric layer may be covered with a protective film on an inner surface of the discharge space.

The discharge space may be formed by etching the second substrate.

The phosphor layer may be formed of a transmissive phosphor formed inside the discharge space formed on the second substrate side.

The discharge space may be formed in a cylindrical shape corresponding to the arrangement of the first electrode, the address electrode, and the second electrode.

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 an exploded perspective view illustrating a plasma display panel according to an exemplary embodiment of the present invention.

Referring to these drawings, the plasma display panel is basically a first substrate (hereinafter referred to as a "back substrate") 10 and a second substrate (hereinafter referred to as "front substrate") that are arranged at predetermined intervals ( 20 and discharge spaces 27 between the rear substrate 10 and the front substrate 20.

The discharge spaces 27 are formed in plural by etching the inside of the front substrate 20 (see FIG. 2). In addition, the discharge spaces 27 may be formed by etching the inside of the rear substrate 10, and may be formed by etching the inside of both substrates 10 and 20 facing each other (not shown).

This etching method can lower the processing cost as compared to the method of separately providing a partition layer on both substrates 10 and 20.

Furthermore, the discharge spaces 27 may include a partition layer (not shown) between the rear substrate 10 and the front substrate 20, and may be divided into a plurality of partition walls. In this case, the partition layer may be formed on the front substrate 20, may be formed on the rear substrate 10, and may be separately or integrally formed on both substrates 10 and 20, respectively.

The discharge space 27 may be formed in various shapes such as a square or a hexagon. This embodiment illustrates a discharge space 27 formed in a cylindrical shape (see Fig. 3). The cylindrical discharge space 27 makes the distance from its inner circumferential surface to the center constant, thereby enabling uniform discharge in the discharge space 27.

The discharge space 27 includes a phosphor layer 29 therein to absorb vacuum ultraviolet rays and emit visible light. In addition, the discharge space 27 is filled with a discharge gas (for example, a mixed gas containing neon (Ne), xenon (Xe), etc.) so as to generate vacuum ultraviolet rays by plasma discharge.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. Referring to this drawing, the inside of the front substrate 20 is etched to be described as an embodiment having a discharge space 27.

The phosphor layer 29 is formed on the inner side and the inner surface of the discharge space 27 formed by etching the inside of the front substrate 20. The phosphor layer 29 is formed of a transmissive phosphor that absorbs vacuum ultraviolet rays in the discharge space 27 and transmits visible light toward the front substrate 20.

When the phosphor layer is formed on the back substrate 10, the phosphor layer is formed of a reflective phosphor that absorbs vacuum ultraviolet rays and reflects visible light in the discharge space 27 (not shown).

When the phosphor layer is formed on the front substrate 20 and the back substrate 10, the phosphor layer of the front substrate 20 is formed of a transmissive phosphor, the phosphor layer formed on the back substrate 10 is formed of a reflective phosphor (Not shown).

The plasma display panel according to an embodiment of the present invention uses a first electrode corresponding to each discharge space 27 (hereinafter, " hold ") to generate an image by generating vacuum ultraviolet rays that will collide with the phosphor layer 29 by plasma discharge. An electrode 31), a second electrode (hereinafter referred to as " scan electrode ") 32, and an address electrode 33 are provided between the back substrate 10 and the front substrate 20. The " electrode "

The plasma display panel selects the discharge space 27 to be enlarged by the address discharge by the scan electrode 32 and the address electrode 33. After this selection, the sustain discharge by the sustain electrode 31 and the scan electrode 32 is selected. Thus, an image is implemented in the discharge space 27.

To this end, the scan electrode 32 applies a sustain pulse during sustain discharge and a scan pulse during address discharge. The sustain electrode 31 applies a sustain pulse during sustain discharge. The address electrode 33 applies an address pulse during address discharge.

The sustain electrode 31, the scan electrode 32, and the address electrode 33 may perform their roles differently depending on the signal voltage applied to them. Therefore, the relationship between the electrodes and the voltage signals is not limited to the above description.

The sustain electrode 31, the scan electrode 32, and the address electrode 33 are formed between the substrates 10 and 20 by forming separate electrode layers 30. Therefore, since the discharge space 27 is formed in the front substrate 10, the electrode layer 30 is provided between the discharge space 27 and the rear substrate 10 on the front substrate 10 side.

In addition, since the sustain electrode 31, the scan electrode 32, and the address electrode 33 do not lower the front opening ratio of the discharge space 27, the sustain electrode 31, the scan electrode 32, and the address electrode 33 may be formed of an opaque material. .

In the electrode layer 30, the sustain electrode 31 is provided on the discharge space 27 side of the front substrate 20, the scan electrode 32 is provided on the back substrate 10 side, and the address electrode 33 is provided. Is provided between the sustain electrode 31 and the scan electrode 32.

The electrode layer 30 forms another discharge space 37 which is integrally connected to the discharge space 27 formed on the front substrate 20. That is, one discharge cell 17 is formed by the discharge space 27 by the etching of the front substrate 20 and the discharge space 37 by the electrode layer 30.

FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, and FIG. 4 is a perspective view showing an arrangement of electrodes.

The sustain electrode 31, the scan electrode 32, and the address electrode 33 respectively have a structure corresponding to the discharge space 27 and surrounding the discharge space 37 connected thereto.

The sustain electrode 31 surrounds the discharge space 37 at the side of the front substrate 20 (that is, the discharge space 27) and is connected along the first direction (x-axis direction). The sustain electrode 31 continuously corresponds to the discharge space 37 adjacent along the x axis direction. The plurality of sustain electrodes 31 are arranged side by side along the second direction (y axis direction) while maintaining a distance between adjacent discharge spaces 37.

The scan electrode 32 surrounds each discharge space 37 on the rear substrate 10 side and is connected along the x axis direction. In the structure surrounding the discharge space 37 and connected, the scan electrode 32 has a structure corresponding to the sustain electrode 31. The scan electrode 32 is spaced apart from the sustain electrode 31 along the vertical direction (z-axis direction) of both substrates 10 and 20. The scan electrodes 32 correspond to the discharge spaces 37 adjacent to each other along the x axis direction. The plurality of scan electrodes 32 are arranged side by side in the y-axis direction while maintaining a distance between adjacent discharge spaces 37.

The address electrode 33 is provided between the sustain electrode 31 and the scan electrode 32 along the vertical direction (z-axis direction) of both substrates 10 and 20.

The address electrodes 33 are spaced apart from the sustain electrodes 31 and the scan electrodes 32 in the vertical direction (z-axis direction) of both substrates 10 and 20, respectively. In this state, the address electrode 33 is disposed closer to the electrode involved in the address discharge among the two electrodes 31 and 32.

The scan electrode 32 applies a scan pulse in the addressing period to participate in the address discharge. Therefore, the address electrode 33 is disposed closer to the scan electrode 32 than the sustain electrode 31.

In the distance LL in the vertical direction (z-axis direction) of both substrates 10 and 20, the address electrode 33 forms a first distance LL1 between the sustain electrode 31 and the scan electrode. A second distance LL2 is formed between (32). At this time, the first distance LL1 and the second distance LL2 maintain different sizes. That is, the second distance LL2 is formed shorter than the first distance LL1 (see FIG. 2 or FIG. 5).

The address electrode 33 continuously corresponds to the discharge space 37 adjacent along the y axis direction. That is, the connection direction (y axis direction) of the address electrode 33 crosses the connection direction (x axis direction) of the scan electrode 32. The plurality of address electrodes 33 are arranged side by side along the x-axis direction while maintaining a distance between adjacent discharge spaces 37. The discharge spaces 27 and 37 may be selected due to the cross arrangement of the address electrode 33 and the scan electrode 32.

The sustain electrode 31, the scan electrode 32, and the address electrode 33 are preferably formed in a structure that directs the plasma discharge to the center of the discharge space 37.

To this end, each of the sustain electrode 31 and the scan electrode 32 is formed to include circular members 31a and 32a and connecting members 31b and 32b. Circular members 31a and 32a surround the discharge space 37 on the sides thereof. The connecting member 31b of the sustain electrode 31 connects the circular members 31a of the sustain electrode 31 to each other in the x-axis direction. The connecting member 32a of the scan electrode 32 connects the circular members 32a of the scan electrode 32 to each other in the x-axis direction.

In addition, the address electrode 33 includes a circular member 33a and a connection member 33b. The circular member 33a surrounds the discharge space 37 on its side. The connecting member 33b of the address electrode 33 connects the circular members 33a of the address electrode 33 to each other in the y axis direction.

The circular member 31a of the sustain electrode 31, the circular member 33a of the address electrode 33, and the circular member 32a of the scan electrode 32 are formed of the front substrate 20 and the rear substrate 10. They are arranged side by side spaced apart from each other along the vertical direction (z axis direction).

On the other hand, it is preferable that the sustain electrode 31, the scan electrode 32, and the address electrode 33 are formed in a structure that enables plasma discharge by a low voltage.

5 is a cross-sectional view comparing the cross-sectional specifications of the sustain electrode, scan electrode, and address electrode.

In the cross section in which both substrates 10 and 20 are cut in the vertical direction (z-axis direction), each of the sustain electrode 31, the scan electrode 32, and the address electrode 33 has rectangular horizontal sides 31c, 32c, and 33c. ) And vertical sides 31d, 32d, and 33d.

Each of the horizontal edges 31c, 32c, and 33c of the sustain electrode 31, the scan electrode 32, and the address electrode 33 has a length corresponding to each other.

Each of the vertical edges 31d and 32d of the sustain electrode 31 and the scan electrode 32 causing the sustain discharge has a length corresponding to each other.

As the address electrode 33 is spaced apart from the sustain electrode 31 and the scan electrode 32 toward the scan electrode 32, the initial addressing voltage can be lowered, thereby causing address discharge at a lower voltage. have.

In addition, the electrode layer 30 includes a sustain electrode 31, an address electrode 33, and a first dielectric layer 34 and a second dielectric layer 35 filling the scan electrode 32.

The first dielectric layer 34 is disposed on the front substrate 20 by filling the sustain electrode 31. The second dielectric layer 35 is provided on the rear substrate 10 by filling the scan electrode 32 and the address electrode 33.

The first dielectric layer 34 and the second dielectric layer 35 have different dielectric constants of the first dielectric constant ε ₁ and the second dielectric constant ε ₂ . It is preferable that the second dielectric constant ε ₂ is greater than the first dielectric constant ε ₁ .

The second dielectric layer having the second dielectric constant ε ₂ fills the scan electrode 32 and the address electrode 33, thereby enabling address discharge at a portion having a high dielectric constant during address discharge.

The capacitance C between the scan electrode 32 and the address electrode 33 is proportional to the second dielectric constant ε ₂ of the second dielectric layer 35 as in Equation 1. The scan electrode 32 and the address are It is inversely proportional to the distance d between the electrodes 33 and is proportional to the opposing cross-sectional area S of the scanning electrode 32 and the address electrode 33.

In this case, the opposing cross-sectional area S of the scan electrode 32 and the address electrode 33 is constant, and the capacitance C between the sustain electrode 32 and the address electrode 33 becomes shorter as the distance d becomes shorter. Becomes large.

The capacitance Q between the address electrode 33 and the scan electrode 32 is proportional to the capacitance C, as shown in equation (2).

In this case, the voltage V applied between the address electrode 33 and the scan electrode 32 is a constant, and the capacitance Q increases as the capacitance C increases.

As the capacitance Q increases, more wall charges accumulate in the second dielectric layer 35.

As the wall voltage caused by the wall charges increases, the address voltage of the address pulse for address discharge can be lowered. That is, address discharge by low voltage is possible.

The second dielectric layer 35 and the first dielectric layer 34 form a cylindrical discharge space 37 corresponding to the discharge space 27 formed on the front substrate 20 side.

The first dielectric layer 34 and the second dielectric layer 35 are covered with a protective film 36 on the inner surface of the discharge cell 17 that forms the one side discharge space 37. The protective film 36 may be formed at a portion exposed to the plasma discharge occurring in the discharge space 37.

The protective film 36 protects the first dielectric layer 34 and the second dielectric layer 35 and requires a high secondary electron emission coefficient, but does not need to have visible light transmission. That is, since the electrodes 31, 32, and 33 are not formed on the front substrate 20 or the back substrate 10, the electrodes 31, 32, and 33 are embedded between the substrates 10 and 20. The protective layer 36 applied to the first dielectric layer 34 and the second dielectric layer 35 may be formed of a material having visible light impermeability.

As an example of the protective film 36, the visible light-transmissive MgO has a much higher secondary electron emission coefficient value than the visible light-transmissive MgO, and thus the discharge start voltage can be further lowered.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. It goes without saying that it belongs to the scope of the present invention.

As described above, according to the plasma display panel according to the exemplary embodiment of the present invention, the sustain electrode, the address electrode, and the scan electrode are spaced apart in the vertical direction between the rear substrate and the front substrate, and the discharge space is surrounded on the side. Since the structure is formed, the aperture ratio of the discharge space or the transmittance of visible light is improved, and the brightness and luminous efficiency are improved.

In addition, according to an embodiment of the present invention, the address electrode is disposed closer to the scan electrode than the sustain electrode, thereby lowering the initial addressing voltage to smoothly induce the address discharge and securing a wider addressing voltage margin.

In addition, according to an embodiment of the present invention, the second dielectric layer filling the address electrode and the scan electrode is formed of a dielectric having a higher dielectric constant than that of the first dielectric layer filling the sustain electrode, thereby lowering the addressing voltage at the initial address. It leads to smoothly, and has the effect of securing a wider addressing voltage margin.

Claims (14)

A first substrate and a second substrate disposed to face each other at a predetermined interval and having a plurality of discharge spaces interposed therebetween; Phosphor layers formed in the discharge spaces; A first electrode between the first substrate and the second substrate, each of which surrounds one of the substrate-side discharge spaces and is connected in a first direction; A second electrode spaced apart from the first electrode in a vertical direction of the first substrate and the second substrate, surrounding the other substrate-side discharge spaces, and connected in the first direction; And An address electrode connected between the first electrode and the second electrode in a second direction that surrounds the discharge spaces and crosses the first direction, respectively. Including; At a distance in the vertical direction between the first substrate and the second substrate, And a first distance between the address electrode and the first electrode and a second distance between the address electrode and the second electrode have different sizes. According to claim 1, And the second distance is shorter than the first distance. The method of claim 2, And the second electrode applies a scan pulse in an addressing period and a sustain pulse in a sustain discharge period. According to claim 1, The first electrode is embedded with a first dielectric layer having a first dielectric constant, And the second electrode is filled with a second dielectric layer having a second dielectric constant different from the first dielectric constant. The method of claim 4, wherein And said second dielectric constant is greater than said first dielectric constant. The method of claim 5, And the address electrode is buried in the second dielectric layer. According to claim 1, Each of the first electrode and the second electrode, A circular member surrounding the discharge space; And a connection member connecting the circular members in the second direction. The method of claim 7, wherein The address electrode, A circular member surrounding the discharge space; And a connection member connecting the circular members in the first direction. The method of claim 8, The circular member of the first electrode, the circular member of the address electrode, and the circular member of the second electrode, And a plasma display panel disposed side by side and spaced apart from each other along a vertical direction of the first substrate and the second substrate. According to claim 1, And the first electrode, the second electrode, and the address electrode are formed of a metal electrode. The method of claim 4, wherein The first dielectric layer and the second dielectric layer are covered with a protective film on the inner surface of the discharge space. According to claim 1, And the discharge space is formed by etching the second substrate. The method of claim 12, And the phosphor layer is formed of a transmissive phosphor formed inside the discharge space formed on the second substrate side. According to claim 1, And the discharge space is formed in a cylindrical shape corresponding to the arrangement of the first electrode, the address electrode, and the second electrode.

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