KR100670336B1 - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel with improved visible light transmittance. To achieve the above object, the present invention provides a rear substrate, a front substrate spaced apart from the rear substrate, and the front substrate and the rear substrate. Partitions disposed between the discharge cells and partitioning discharge cells, the barrier ribs having a width decreasing from the rear substrate to the front substrate, address electrodes disposed to extend across the discharge cells, and the address in the discharge cell. The present invention provides a plasma display panel including sustain electrode pairs extending to intersect with electrodes, and phosphor layers disposed in the discharge cells.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view of a conventional plasma display panel,

2 is a partially cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2 and shows a state in which the lower plate is rotated 90 degrees.

Explanation of symbols on the main parts of the drawings

100: plasma display panel

110: back substrate 112: sustain electrode pair

113: X electrode 114: Y electrode

116: first dielectric layer 119: protective layer

120: front substrate 122: address electrode

126: second dielectric layer 128: partition wall

129 phosphor layer 130 discharge cell

W: width of bulkhead

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel with improved visible light transmittance.

Recently, a plasma display panel, which is drawing attention as a replacement of a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. The phosphor formed in a predetermined pattern by the ultraviolet rays is excited to obtain a desired image.

FIG. 1 is an exploded perspective view partially showing a conventional alternating current three-electrode surface discharge plasma display panel 5. As used herein, "front" means the direction in which the image is displayed. Referring to FIG. 1, the plasma display panel 5 includes a rear substrate 10 and a front substrate 20 that face each other. A plurality of address electrodes 11 are arranged on the front surface of the rear substrate 10, and the address electrodes 11 are embedded by the first dielectric layer 12. The partition wall 13 partitions the discharge cells 14 on the entire surface of the first dielectric layer 12. The phosphor layer 15 is applied to a predetermined thickness in the discharge cell 14 partitioned by the partition wall 13. The front substrate 20 is a transparent substrate through which visible light can be transmitted. The front substrate 20 is mainly made of glass and is coupled to the rear substrate 10 provided with the partition wall 13. On the rear surface of the front substrate 20, sustain electrode pairs 30 are formed to intersect the address electrodes 11. One sustaining electrode of the pair of sustaining electrodes 30 is the X electrode 21, and the other sustaining electrode is the Y electrode 22. Each of the sustain electrodes 21 and 22 includes transparent electrodes 21a and 22a and bus electrodes 21b and 22b. The sustain electrode pairs 30 are buried by the transparent second dielectric layer 23, and a protective layer 24 is formed on the rear surface of the second dielectric layer 23.

However, in the case of the plasma display panel, since the sustain electrode pairs 30 are disposed on the rear surface of the front substrate 20 on which visible light is projected, there is a limit in the structure change to improve the luminous efficiency. In particular, since the bus electrodes 21b and 22b are generally formed using an opaque conductive metal, there is a problem of further reducing the visible light transmittance. Since the protective layer 24 is formed on the rear surface of the second dielectric layer 23, there is a problem that transmittance of visible light generated in the discharge cells 14 is lowered.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel with improved visible light transmittance.

In order to achieve the above and other objects, the present invention provides a rear substrate, a front substrate spaced apart from the rear substrate, and disposed between the front substrate and the rear substrate to partition the discharge cells, the rear Barrier ribs having a width decreasing from a substrate adjacent to the front substrate, address electrodes arranged to extend across the discharge cells, sustain electrode pairs extending from the discharge cell to intersect the address electrode; It provides a plasma display panel comprising; phosphor layers disposed in the discharge cells.

In the present invention, it is preferable that the width of the partitions linearly decreases from the rear substrate to the front substrate.

2 is an exploded perspective view of the plasma display panel 100 according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. 3 illustrates the lower plate 160 rotated 90 degrees to clearly show the internal structure of the plasma display panel 100.

2 and 3, the plasma display panel 100 includes a top plate 150 and a bottom plate 160. The lower plate 160 compares the rear substrate 110, the first dielectric layer 116, the sustain electrode pairs 112, and the protection layer 119. The upper plate 150 is the front substrate 120 and the address electrode 122. ), A second dielectric layer 126, partition walls 128, and a phosphor layer 129.

The back substrate 110 and the front substrate 120 are spaced apart at predetermined intervals to define a plurality of discharge cells 130 partitioned by partitions 128 therebetween. Since the front (z direction) is the direction in which the image is displayed, the front substrate 120 is generally manufactured using glass having excellent visible light transmittance.

The back substrate 110 may be manufactured using various materials. For example, the back substrate 110 may be manufactured using a material including glass, similar to the front substrate 120.

On the front substrate 120 facing the rear substrate 110, partition walls 128 are formed to partition the plurality of discharge cells 130. In FIG. 2, the partitions 128 are formed to have a stripe shape extending in one direction (y direction), but the present invention is not limited thereto. As long as a plurality of discharge spaces may be formed, partition walls of various patterns may be formed. For example, an open partition such as a stripe may be used as well as a closed partition such as a waffle, a matrix, a delta, or the like. In this case, the closed partition wall may be formed such that the cross section of the discharge space is a polygon, such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the quadrangle. In addition, in the present embodiment, the partitions 128 are formed on the front substrate 120, but the arrangement position of the partitions 128 is not limited thereto, and may be disposed on the second dielectric layer 126 described later. .

In the present embodiment, the width W of the partitions 128 decreases as the direction W goes from the rear substrate 110 toward the front substrate 120 (Z direction). For example, the width W1 of the end portion adjacent to the front substrate 120 is formed to be narrower than the width W2 of the end portion adjacent to the rear substrate 110 among both ends of each partition wall 128. As described above, the width W of the barrier ribs 128 decreases toward the front side, thereby increasing the opening ratio of each of the discharge cells. Therefore, the visible light transmittance is improved by increasing the aperture ratio. The width of the partitions 128 may be variously implemented. However, the width of the partitions 128 may be changed linearly to simplify the manufacturing method.

The partitions 128 having such a shape may be manufactured by tilting the front substrate 120 on which the partitions 128 are formed at a predetermined angle when sandblasting is performed.

Referring to FIG. 2, the sustain electrode pairs 112 are arranged in parallel on the rear substrate 110 facing the discharge cells 130 at predetermined intervals. However, the arrangement position of the sustain electrode pairs 112 is not limited thereto. For example, the sustain electrode pairs may be spaced apart from the rear surface of the rear substrate at predetermined intervals. In this embodiment, each of the sustain electrode pairs 112 extends across the discharge cells 130 arranged in one direction (x direction).

The sustain electrode pair 112 includes an X electrode 113 and a Y electrode 114, where the X electrode 113 functions as a common electrode and the Y electrode 114 functions as a scan electrode. . The X electrode 113 and the bus electrode 113 of the Y electrode are spaced apart at predetermined intervals and extend across the discharge cells 130 in parallel in one direction (x direction). Since the sustain electrode pairs 112 are disposed on the back substrate 110, transparency is not required, and thus the sustain electrode pairs 112 may be formed of a general conductive metal material. As described above, since the sustain electrode pairs 112 can be formed of a metal material having excellent conductivity such as Ag, Al, or Cu and low resistance, the response speed due to the discharge is high, the signal is not distorted, and it is necessary for the sustain discharge. It is possible to reduce the power consumption has a number of advantages.

The sustain electrode pairs 112 are buried by the first dielectric layer 116 formed on the back substrate 110. The first dielectric layer 116 may be formed by applying a dielectric material to a front surface of the rear substrate 110 to a predetermined thickness. The first dielectric layer 116 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the sustain electrode pairs 112 and damaging the sustain electrode pairs 112 during discharge. PbO, B ₂ O ₃ , SiO ₂ and the like.

The protective layer 119 is preferably formed on the first dielectric layer 116. The protective layer 119 prevents the first dielectric layer 116 and the sustain electrode pair 112 from being damaged by the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons. The protective layer 119 may be formed by applying magnesium oxide (MgO) to a predetermined thickness on the first dielectric layer 116. The protective layer 119 is mainly formed of a thin film by sputtering or electron beam deposition.

2 and 4, a plurality of address electrodes 122 having a stripe shape in a direction (y direction) intersecting the sustain electrode pairs 112 in each of the discharge cells 130 on the rear surface of the front substrate 120. ) Are placed. The address electrodes 122 are used to generate an address discharge for facilitating sustain discharge between the X electrode 113 and the Y electrode 114. More specifically, the address electrodes 122 lower the voltage for sustain discharge. The address discharge is a discharge that occurs between the Y electrode 114 and the address electrode 122. Since the address electrodes 122 are disposed in front of the discharge cells 130, in order to improve visible light transmittance, the address electrodes 122 are formed using a transparent metal such as indium tin oxide (ITO).

2 and 3, the address electrodes 122 are buried by the second dielectric layer 126. The second dielectric layer 126 may be formed by applying a dielectric material on the front substrate 120 to a predetermined thickness. The second dielectric layer 126 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the address electrodes 122 upon discharge, such as PbO, B ₂ O ₃ , SiO ₂ and the like.

Red, green, and blue light emitting phosphor layers 129 are applied to a side of the partition wall 128 and the second dielectric layer 126 to a predetermined thickness, respectively. However, the position where the phosphor layer is disposed is not limited thereto.

The phosphor layers 129 have a component that generates ultraviolet light by receiving ultraviolet rays, and the red light emitting phosphor layer formed in the red discharge cells includes phosphors such as Y (V, P) O ₄ : Eu and the like. The formed green light emitting phosphor layer includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light emitting phosphor layer formed in the blue discharge cell includes a phosphor such as BAM: Eu.

In addition, the discharge cells 130 are filled with a discharge gas in which neon (Ne), xenon (Xe), etc. are mixed, and in the state where the discharge gas is filled as described above, The front substrate and the rear substrates 120 and 110 are sealed to each other and joined by a sealing member such as frit glass formed at the edge thereof.

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

An address discharge is generated by applying an address voltage between the address electrode 122 and the Y electrode 114. As a result of the address discharge, wall charges are accumulated on the electrodes, so that the discharge cells 130 for sustain discharge are selected.

After that, when a discharge holding voltage is applied between the X electrode 113 and the Y electrode 114 of the selected discharge cell 130, the wall charges accumulated on the X electrode 113 and the Y electrode 114 are maintained. A discharge is caused, and ultraviolet rays are emitted while the energy level of the discharge gas excited during this sustain discharge is lowered. The ultraviolet rays excite the phosphor 129 coated in the discharge cell 130. As the energy level of the excited phosphor 129 decreases, visible light is emitted, and the visible light is emitted from the second dielectric layer 126 and the front substrate. It is emitted through the 120 to form an image that can be recognized by the user.

The plasma display panel according to the present invention has the following effects.

First, since the width of the partition walls decreases from the rear substrate to the front substrate, the opening ratio in the forward direction is improved. Therefore, the visible light transmittance is improved, and the luminous efficiency is improved.

Second, when the sustain electrode pair and the protective layer are disposed on the rear substrate, the visible light transmittance of the front substrate is further improved to increase the luminance.

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 (9)

Back substrate; A front substrate spaced apart from the rear substrate; Disposed between the front substrate and the rear substrate to partition discharge cells; Barrier ribs whose width decreases from a substrate to the front substrate; Address electrodes disposed on the front substrate facing the rear substrate so as to extend across the discharge cells; Sustain electrode pairs disposed on the rear substrate facing the front substrate so as to extend across the address electrode in the discharge cell; And And phosphor layers disposed in the discharge cells. The method of claim 1, And a width of the barrier ribs decreases linearly from the rear substrate to the front substrate. delete delete The method of claim 1, And the barrier ribs are disposed on the front substrate facing the rear substrate. The method of claim 1, A first dielectric layer covering the sustain electrode pairs; And a second dielectric layer covering the address electrodes. The method of claim 6, And a protective layer covering the first dielectric layer. The method of claim 1, And at least one phosphor layer disposed on side surfaces of the barrier ribs. The method of claim 1, And the address electrodes are transparent.

Images