KR100730203B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to reduce discharge margin difference between discharge cells and exhaust efficiently impurity gas from the discharge cells. A rear substrate(121) is disposed opposite to a front substrate(111) in order to define red, green, and blue discharge cells. A barrier rib(130) includes a plurality of first barrier ribs(131) defining discharge cells, a plurality of second barrier ribs(132) connected to the first barrier rib, and a plurality of third barrier ribs(133) arranged between rows. A plurality of sustain electrodes are extended along the discharge cells arranged in the row direction. Red, green, and blue phosphors(126R,126G,126B) are arranged in the red, green, and blue discharge cells. The green phosphor is electrified with an anode.

Description

Plasma display panel {Plasma display panel}

1 is a partially cutaway perspective view of 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 layout view illustrating an arrangement position of sustain electrodes, barrier ribs, and discharge cells shown in FIG. 1.

FIG. 4 is a layout diagram illustrating an arrangement position of sustain electrodes, barrier ribs, and discharge cells as a first modified example in which the third partition portions are disposed at positions different from those of FIG. 1.

FIG. 5 is a layout diagram illustrating arrangement positions of sustain electrodes, barrier ribs, and discharge cells as a second modified example in which a third partition portion is disposed at a position different from that of FIG. 1.

6 is a graph measuring discharge margin of the present example in which the green light emitting phosphor layer was oxidized to the anode (+) and the comparative example not oxidized to the anode (+).

<Brief description of symbols for the main parts of the drawings>

100: plasma display panel

111: front substrate 115: front dielectric layer

116: protective layer 121: back substrate

122: address electrode 125: rear dielectric layer

126R, 126G, 126B: red, green, blue light emitting phosphor layer

130: partition 131: first partition

132: second partition 133, 233, 333a, 333b: third partition

X: Y electrode Y: Y electrode

150: front panel 160: rear panel

170: discharge cell

170R, 170G, 170B: red, green, blue discharge cells

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel with improved discharge margin.

Plasma display device using plasma display panel is a flat panel display device that displays images by using gas discharge phenomenon. It is excellent in various displays such as brightness, contrast, afterimage, and viewing angle, and it is possible to display thin and large screens. It is attracting attention as a display device.

In the plasma display panel, the discharge margin is different depending on the characteristics of the phosphor layer. In addition, as the plasma display panel is more finely sized, the size of the discharge cells of the plasma display panel is gradually decreasing. In such small sized discharge cells, there is a problem in that the difference in the discharge margin is further increased. In general, the discharge margin of the green light emitting phosphor layer is the smallest among the red, green, and blue light emitting phosphor layers, and a solution for this is required.

An object of the present invention is to provide a plasma display panel in which a discharge margin is improved by charging a green light emitting phosphor layer with an anode (+).

The present invention is arranged so as to face the front substrate and the front substrate, the back substrate defining red, green and blue discharge cells arranged in a matrix pattern between the front substrate and the discharge disposed in the row direction. Partition walls including first partition walls partitioning cells, second partition walls connecting the first partition walls, and third partition walls disposed between rows of the discharge cells; The present invention provides a plasma display panel including red, green, and blue light emitting phosphor layers disposed in blue discharge cells, wherein the green light emitting phosphor layers are charged with an anode (+).

In the present invention, the green light emitting phosphor layers preferably include Ba-based phosphors or Y-based phosphors. The Ba-based phosphor is BAM: Mn, and the Y-based phosphor is YBO ₃ : Mn.

In addition, in the present invention, it is preferable that the height of the portion where the third partitions and the first partitions intersect is lower than the height of the other part of the partition.

Further, in the present invention, it is preferable that the third partitions are arranged so as to substantially correspond to the middle portions in the longitudinal direction of the second partitions. However, the third partition walls may be disposed to substantially correspond to the first partition walls. In addition, the third partitions may be disposed to substantially correspond to a central portion in the longitudinal direction of the second partitions and the first partitions.

Further, in the present invention, it is preferable to further include sustain electrodes extending along the discharge cells arranged in the row direction. In this case, each of the sustain electrodes may be arranged such that at least one portion thereof corresponds to a region between the rows of the discharge cells. Each of the sustain electrodes functions in common to discharge cells of adjacent rows, and each of the sustain electrodes is electrically connected to a bus electrode disposed to correspond to an area between rows of the discharge cells, and to the bus electrodes. It is preferable to include a transparent electrode extending in the direction of the discharge cells of the adjacent rows.

In addition, the sustain electrodes may be disposed between the barrier rib and the front substrate.

The plasma display panel further includes address electrodes extending to intersect the sustain electrodes, a front dielectric layer and a rear dielectric layer covering the sustain electrodes and the address electrodes, and a discharge gas filled in the discharge cells. It is preferable.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, a plasma display panel 100 according to a preferred embodiment of the present invention is shown. 1 is a partially cutaway perspective view of the plasma display panel 100, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 3 is a layout diagram illustrating an arrangement position of sustain electrodes, barrier ribs, and discharge cells shown in FIG. 1.

Referring to FIG. 1, the plasma display panel 100 includes a front panel 150 and a rear panel 160 that are largely opposed to each other. The front panel includes a front substrate 111, sustain electrodes (X, Y), a protective layer 116, and a front dielectric layer 115, and the back panel 160 includes a rear substrate 121 and a rear dielectric layer ( 125, address electrodes 122, barrier ribs 130, and red, green, and blue light emitting phosphor layers 126R, 126G, and 126B, and between the front panel 150 and the back panel 160. The space is filled with discharge gas (not shown). Look in detail below.

The front substrate 111 generally includes glass having excellent visible light transmittance. However, the front substrate 111 may be colored in order to improve the clear room contrast.

The rear substrate 121 is disposed to face each other at a predetermined interval from the front substrate 111, and is preferably formed of a material including glass. The back substrate 121 may also be colored in order to improve clear room contrast.

1 and 3, a partition wall 130 is formed between the front substrate 111 and the rear substrate 121 to partition a plurality of discharge cells 170 in which a discharge phenomenon occurs. The discharge cells 170 include red, green, and blue discharge cells 170R, 170G, and 170B. In this case, the discharge cells 170 are arranged in a matrix pattern, and more specifically, the discharge cells 170 are composed of a plurality of rows and a plurality of columns. The red discharge cells 170R, the green discharge cells 170R, and the blue discharge cells 170B are arranged along a column direction (second direction), respectively, and in the row direction, red, green, and blue discharge cells ( 170R, 170G and 170B are repeatedly arranged alternately.

The partition 130 performs a function of preventing optical / electric crosstalk between the discharge cells 170. The partition wall 130 may include first partition wall portions 131 partitioning between discharge cells 170 arranged in a row direction (first direction), and a second connection wall portion connecting the first partition wall portions 131. The partition parts 132 are included. Therefore, each discharge cell 170 has a closed structure defined by two first partition portions 131 facing each other and two second partition portions 132 facing each other.

The discharge cells 170 arranged in the row direction (first direction) are spaced apart from each other at predetermined intervals. The partition wall further includes third partition wall portions 133 disposed in the spaced space. Moreover, each 3rd partition wall part 133 is arrange | positioned so that it may correspond to the center part of the longitudinal direction of each 2nd partition wall part 132 substantially. However, the arrangement position of the third partition 133 is not limited thereto. Referring to FIG. 4, a state where the third partition walls 233 are arranged to be aligned with the first partition walls 131 is illustrated. In addition, as shown in FIG. 5, a portion 333a of the third partition walls is aligned with the first partition walls 131, and the remaining 233b is the length of each second partition wall 132. It may be arranged to correspond to the center portion in the direction.

Referring again to FIGS. 1 and 2, the height H of the portion 197 where the third partitions and the first partitions intersect is lower than the height of the other part of the partition. The height is defined here as the average height of the top surface of each member.

In the discharge cells 170 arranged in the row direction (first direction), since relatively large gaps are formed between the front panel 150 and the crossing portion 197, gas communication is caused in the gaps. It becomes possible. Therefore, the gaps have an advantage of smooth exhaust.

1 and 3, on the front substrate 111 facing the rear substrate 121, sustain electrodes X and Y are spaced apart from each other and arranged in parallel. The sustain electrodes X and Y cause discharge in the discharge cells 170 and have a structure in which one X electrode X and one Y electrode Y are disposed in each discharge cell 170. Have Therefore, each of the sustain electrodes X and Y performs the function of the X electrode or the Y electrode, and the sustain electrodes X and Y are repeatedly arranged alternately with the X electrode X and the Y electrode Y. It becomes a structure.

The sustain electrodes X and Y extend in the row direction (first direction). Each of the sustain electrodes X and Y includes bus electrodes Xb and Yb and transparent electrodes Xa and Ya electrically connected to the bus electrodes Xb and Yb. The width of the transparent electrode is greater than the width of the bus electrode, and the bus electrodes Xb and Yb are aligned with the transparent electrodes Xa and Ya.

The bus electrodes Xb and Yb are disposed to overlap the region 195 between the rows of the discharge cells 170 and a portion of the third partition 133. In general, the bus electrodes Xb and Yb are formed using a metal having excellent conductivity. In addition, since the bus electrodes Xb and Yb are formed in a multi-layered structure in which at least one layer has a dark color, bright bus contrast is improved by the bus electrodes Xb and Yb.

In addition, the transparent electrodes Xa and Ya extend from the region 195 between the rows of the discharge cells 170 to the inner regions of the discharge cells 170. Therefore, since the transparent electrodes Xa and Ya correspond to the discharge cells 170 of the adjacent rows in common, the transparent electrodes Xa and Ya function in common to the corresponding discharge cells.

The front dielectric layer 115 is formed on the front substrate 111 to fill the sustain electrodes X and Y. The front dielectric layer 115 prevents adjacent X electrodes X and Y electrodes Y from being energized with each other, and at the same time, charged particles or electrons are transferred to the X electrodes X and Y electrodes Y. It directly prevents damage to the X electrodes X and the Y electrodes Y. In addition, the front dielectric layer 115 performs a function of inducing charge.

On the front dielectric layer 115, a protective layer 116, which is usually made of MgO, is formed. The protective layer 116 prevents cations and electrons from colliding with the front dielectric layer 115 during the discharge to damage the front dielectric layer 115, and has good light transmittance and emits a lot of secondary electrons during the discharge. In particular, the protective layer 116 is mainly formed of a thin film using sputtering, electron beam deposition, or the like.

On the rear substrate 121 facing the front substrate 111, the address electrodes 122 are disposed to intersect the X electrodes X and the Y electrodes Y. The address electrodes 122 are used to generate an address discharge to facilitate sustain discharge between the X electrodes X and the Y electrodes Y. More specifically, the address electrodes 122 lower the voltage for sustain discharge. . The address discharge is a discharge that occurs between the Y electrodes Y and the address electrodes 122.

The rear dielectric layer 125 is formed on the rear substrate 121 to bury the address electrodes 122. The back dielectric layer 125 is formed of a dielectric. In addition, the rear dielectric layer 125 prevents cations or electrons from colliding with the address electrodes 122 to damage the address electrodes 122 during discharge, and induces charge.

The red, green, and blue discharge cells 170R, 170G, and 170B have red light emitting phosphor layers 126R, green light emitting phosphor layers 126G, and blue light emitting phosphor layers 126B, respectively. The red light emitting phosphor layers 126R, the green light emitting phosphor layers 126G, and the blue light emitting phosphor layers 126B are disposed on the rear dielectric layer 125 and on the sidewalls of the partition wall 130. The phosphor layers 126R, 126G, and 126B include phosphors that receive ultraviolet rays and generate visible light.

In general, the green light emitting phosphor layers 126G have the lowest discharge margins among the red light emitting phosphor layers 126R, the green light emitting phosphor layers 126G, and the blue light emitting phosphor layers 126B. The discharge margin refers to a region where discharge is generated in all discharge cells in order to implement a full pattern screen at room temperature.

In the present embodiment, the surface of the green light emitting phosphor layers 126G is charged with an anode (+). As described above, the green light emitting phosphor layers charged with the anode (+) have a characteristic of improving discharge margin.

6 shows a result of measuring a discharge margin by comparing an example in which a green light emitting phosphor layer is charged with an anode (+) and a comparative example not charged with an anode (+). In FIG. 6, the horizontal axis represents the sustain voltage Vs, and the vertical axis represents the address voltage Va. The experiment was performed on a 50 inch HD plasma display panel. The lamp set voltage in the reset discharge period is 190V, and the bias voltage of the X electrode X is 150V in the address discharge period. In addition, the voltage Va of the address electrode was measured while the scan voltage of the Y electrode Y was constant in the addressing discharge period. In addition, the display was made into the full green pattern. The green light emitting phosphor layer includes BAM: Mn.

In FIG. 6, a region surrounded by a closed curve means a discharge margin. Since the discharge margin of the present embodiment includes the discharge margin of the comparative example, it can be seen that the discharge margin of the present embodiment is improved. Therefore, the discharge margin can be improved by charging the green light emitting phosphor layer to the anode (+).

The green light emitting phosphor layers may be formed using various materials, but preferably include Ba-based phosphors or Y-based phosphors that are easily anode (+) charged. The Ba-based phosphor is BAM: Mn, and the Y-based phosphor is YBO ₃ : Mn.

In addition, the red light emitting phosphor layers 126R may include Y (V, P) O ₄ : Eu, and the blue light emitting phosphor layers 126B may include BAM: Eu.

In addition, as described above, the discharge cells 170 are filled with a discharge gas in which neon (Ne), xenon (Xe) and the like are mixed, and in the state where the discharge gas is filled as described above, the front substrate and the rear substrate ( The front and back substrates 111 and 121 are sealed to each other and joined by a sealing member such as frit glass formed at the edges of the 111 and 121.

Referring to the operation of the plasma panel 100 according to the present invention configured as described above are as follows.

An address discharge is generated by applying an address voltage between the address electrodes 122 and the Y electrodes Y, and the discharge cells 170 in which sustain discharge is generated are selected as a result of the address discharge. Thereafter, when a sustain voltage is applied between the X electrodes X and the Y electrodes Y of the selected discharge cells 170, the sustain discharge is generated.

 In this manner, ultraviolet rays are emitted while the energy level of the discharged gas excited during the sustain discharge is lowered. The ultraviolet rays excite the phosphor layers 126R, 126G, and 126B applied in the red, green, and blue discharge cells 170R, 170G, and 170B, and the excitation of the excited phosphor layers 126R, 126G, and 126B. As the energy level decreases, visible light is emitted, and the emitted visible light constitutes an image.

In the plasma display panel according to the present invention, the discharge margin is improved, and the difference in the discharge margin between the discharge cells is reduced. In addition, the exhaust capacity for exhausting the impurity gas remaining in the discharge cells is improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (15)

Front substrate; A rear substrate disposed to face the front substrate and defining red, green, and blue discharge cells arranged in a matrix pattern between the front substrate and the front substrate; First partitions that partition between the discharge cells arranged in a row direction, second partitions connecting the first partitions, and third partitions disposed between the rows of discharge cells. septum; Sustain electrodes extending along the discharge cells arranged in a row direction, the sustain electrodes being disposed such that at least a portion thereof corresponds to an area between the rows of the discharge cells; And And red, green, and blue light emitting phosphor layers disposed in the red, green, and blue discharge cells, respectively. And the green light emitting phosphor layer is charged with an anode (+). The method of claim 1, The green light emitting phosphor layers include a Ba-based phosphor. The method of claim 2, The green light emitting phosphor layers include BAM: Mn. The method of claim 1, The green light emitting phosphor layers include Y-based phosphors. The method of claim 4, wherein The green light emitting phosphor layers include YBO ₃ : Mn. The method of claim 1, And a height of a portion where the third partitions and the first partitions intersect is lower than a height of another portion of the partition. The method of claim 1, And the third partitions are disposed to correspond to a central portion of the second partitions in the longitudinal direction of the second partitions. The method of claim 1, And the third partitions are disposed to correspond to the first partitions. The method of claim 1, And the third partition walls are disposed to correspond to a central portion of the second partition walls in a longitudinal direction and to the first partition walls. delete delete The method of claim 1, Each of the sustain electrodes commonly acts on discharge cells of adjacent rows. The method of claim 1, Each sustain electrode includes a bus electrode arranged to correspond to an area between rows of the discharge cells, and a transparent electrode electrically connected to the bus electrode and extending in the direction of discharge cells of adjacent rows. panel. The method of claim 1, And the sustain electrodes are disposed between the barrier rib and the front substrate. The method of claim 1, Address electrodes extending to intersect the sustain electrodes; A front dielectric layer and a back dielectric layer covering the sustain electrodes and the address electrodes, respectively; And And a discharge gas filled in the discharge cells.

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