KR20030074987A - Barrier rib of plasma display panel - Google Patents

Abstract

PURPOSE: A barrier rib of a plasma display panel is provided to prevent an abnormal discharge in the non-display area by preventing an accumulation of wall discharge in the non-display area. CONSTITUTION: A barrier rib comprises a plurality of main barrier ribs(64) for defining discharge cells in a display area(61) for displaying images; and auxiliary barrier ribs(63) arranged between the main barrier ribs which are disposed adjacent with each other in the widthwise direction of the main barrier rib, wherein the auxiliary barrier ribs serve to suppress an abnormal discharge in a non-display area(62) arranged in the outside of the display area.

Description

Barrier of plasma display panel {BARRIER RIB OF PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly to a partition of a plasma display panel for suppressing abnormal discharge generated from a non-display area.

Plasma Display Panel (hereinafter referred to as "PDP") is used to excite and emit phosphors by using ultraviolet rays generated when an inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is discharged. Will be displayed. Such PDPs are not only thin and large in size, but also have improved in image quality due to recent technology development.

Referring to FIG. 1, a discharge cell of a three-electrode alternating surface discharge type PDP includes a sustain electrode pair including a scan electrode (Y) and a sustain electrode (Z) formed on the upper substrate 1, and a lower portion perpendicular to the sustain electrode pair. An address electrode X formed on the substrate 2 is provided. Each of the scan electrode Y and the sustain electrode Z is composed of a transparent electrode and a metal bus electrode formed thereon. The upper dielectric layer 6 and the MgO protective layer 7 are stacked on the upper substrate 1 on which the scan electrode Y and the sustain electrode Z are formed. The lower dielectric layer 4 is formed on the lower substrate 2 on which the address electrode X is formed to cover the address electrode X. FIG. A partition 3 is formed vertically on the lower dielectric layer 4. Phosphors 5 are formed on the surfaces of the lower dielectric layers 4 and the partition walls 3. An inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is injected into the discharge space provided between the upper substrate 1, the lower substrate 2, and the partition wall 3. The upper substrate 1 and the lower substrate 2 are bonded by a seal (not shown).

The PDP is time-divisionally driven by dividing one frame into several subfields with different number of emission times in order to realize grayscale of an image. Each subfield is divided into an initialization period for initializing the full screen, an address period for selecting a scan line and selecting a cell in the selected scan line, and a sustain period for implementing gray levels according to the number of discharges. The initialization period is divided into a setup period in which the rising ramp waveform is supplied and a set down period in which the falling ramp waveform is supplied. For example, when the image is to be displayed with 256 gray levels, as shown in FIG. 2, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8. As described above, each of the eight subfields SF1 to SF8 is divided into an initialization period, an address period, and a sustain period. The initialization period and the address period of each subfield are the same for each subfield, while the sustain period and the number of sustain pulses allocated thereto are 2 ⁿ (n = 0,1,2,3,4,5,6) in each subfield. , 7).

As shown in FIGS. 3 and 4, the PDP has a display area 31 in each of the upper non-display area 32 located on the upper outer side of the display area 31 and the lower non-display area 33 located on the lower outside. The dummy discharge space having the same structure as that of the discharge cell in () is formed. That is, the address electrode X and the pair of dummy electrodes UD1, UD2, BD1, and BD2 are formed in each of the upper non-display area 32 and the lower non-display area 33, and the electrodes X, UD1, UD2, Dielectric layers 4 and 6 are formed to cover BD1 and BD2, and phosphors 5 are formed thereon. The dummy electrodes UD1, UD2, BD1, and BD2 formed in the upper non-display area 32 and the lower non-display area 33 respectively generate a discharge in the non-display area in the aging process, thereby causing the display area 31 to be discharged. The discharge characteristics of the discharge cells of the first horizontal line and the n-th horizontal line of the display area 31 are stabilized under the same conditions as the other discharge cells of. To this end, a voltage capable of causing a discharge during the aging process is applied to the dummy electrodes UD1, UD2, BD1, and BD2, and no voltage is applied or the ground voltage GND is applied after the aging process.

The conventional PDP has a problem in that discharge is accidentally generated from the upper non-display area 32 and the lower non-display area 33. Such discharges are defined as abnormal discharges. The abnormal discharge occurs when discharge such as initialization discharge, address discharge and sustain discharge occurs during the operation of the PDP, so that the space charges generated by the discharge are in the dielectric and phosphor phases of the upper non-display area 32 and the lower non-display area 33. Is condensed on. For example, as shown in FIG. 4, as shown in FIG. 4, the negative scan voltage is sequentially shifted to the scan electrodes Y1 to Yn, and the positive space charge 42 moves toward the lower non-display area 33. The negative space charge 41 moves toward the upper non-display area 32. The space charges 41 and 42 moved to the non-display areas 32 and 33 are accumulated on the dielectric layers 6 and 7 and the phosphor 5 in the non-display areas 32 and 33. When the wall voltage rising due to the wall charges accumulated on the non-display areas 32 and 33 is greater than or equal to a voltage capable of causing a discharge, the address electrode X and the scan electrode in the non-display areas 32 and 33 Abnormal discharge occurs between (Y) or the sustain electrode (Z). When the abnormal discharge occurs, not only the image can be implemented for a few seconds but also the visible light 51 generated during the abnormal discharge is propagated toward the display area 31 as shown in FIG. 5 and recognized by the viewer. As a result, the display quality of the PDP is degraded due to the abnormal discharge.

Accordingly, an object of the present invention is to provide a barrier rib of a PDP to suppress abnormal discharge generated from a non-display area.

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

2 is a diagram illustrating a frame configuration of an 8-bit default code for implementing 256 gray levels.

3 is a plan view of a plasma display panel for showing a non-display area.

4 is a cross-sectional view of a plasma display panel for showing a non-display area.

5 is a diagram schematically illustrating visible light generated from a non-display area and recognized in a display area.

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

7 is a cross-sectional view illustrating a cross section between a display area and a non-display area of a plasma display panel according to an exemplary embodiment of the present invention.

8 is a perspective view illustrating an auxiliary partition of a plasma display panel according to a first embodiment of the present invention.

9 is a perspective view illustrating an auxiliary partition of a plasma display panel according to a second exemplary embodiment of the present invention.

10 is a perspective view illustrating an auxiliary partition of a plasma display panel according to a third exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1,71: upper substrate 2,72: lower substrate

3,83,64: bulkhead (main bulkhead) 4,6,74,76: dielectric layer

5: phosphor 7,77: protective layer

31,61: display area 32,33,62: non-display area

41,42: space charge 51: visible light

63: secondary bulkhead 81,91,101: opening hole

82,92,102: air flow path X: address electrode

Y: scan electrode Z: sustain electrode

UD1, UD2, BD1, BD2, D1, D2: dummy electrode

In order to achieve the above object, the partition of the PDP according to the embodiment of the present invention is a plurality of main partitions for partitioning the discharge cells of the display area for displaying an image, and between the main partitions in the width direction of the main partition wall; And an auxiliary barrier rib formed therein to suppress abnormal discharge in the non-display area located outside the display area.

The auxiliary partition wall is positioned in the non-display area.

The auxiliary partition wall is located at a boundary between the display area and the non-display area.

The auxiliary partition wall is characterized in that the opening hole is formed to form an air flow path between the display area and the non-display area.

The auxiliary bulkhead is characterized in that the height is lower than the main bulkhead.

The opening is characterized in that formed in any one of the top and bottom of the auxiliary partition wall.

The main barrier rib is formed in a stripe shape.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 6 to 10.

6 and 7, the PDP according to the embodiment of the present invention is formed on the lower substrate 2 so as to be orthogonal to the sustain electrode pair including the scan electrode Y and the sustain electrode Z, and the sustain electrode pair. The address electrode X, the main partition 64 for vertically dividing the cells by red, green and blue, and the non-display area 62 or the non-display area 62 and the display area 61 An auxiliary partition 63 is formed between the main partitions 64 adjacent to the boundary in the width direction of the main partition.

The non-display area 62 is disposed outside the top or bottom of the display area 61, respectively. In the non-display area 63, dummy electrodes D1 and D2 formed at the same time as the sustain pairs Y and Z of the display area 61 are formed.

The dielectric layer 76 and the MgO protective layer 77 are stacked on the upper substrate 71 on which the sustain electrode pairs Y and Z are formed. The lower dielectric layer 74 is formed on the lower substrate 72 on which the address electrode X is formed to cover the address electrode X, and the main partition 64 and the auxiliary partition 63 are vertically formed thereon. Phosphors not shown are formed on the surfaces of the lower dielectric layer 74, the main partition 64, and the auxiliary partition 63. An inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is injected into the discharge space provided between the upper substrate 71, the lower substrate 72, and the main partition 64. The upper substrate 71 and the lower substrate 72 are bonded by a seal (not shown).

The main partition 64 is vertically elongated in the form of a stripe to physically distinguish discharge spaces of red, green, and blue (R, G, B) to electrically and optically crosstalk between adjacent cells. Will be prevented.

The auxiliary partition 63 is formed in the width direction of the main partition 64 to block the space charge generated in the display area 61 during the initialization discharge, the address discharge, and the sustain discharge, from moving to the non-display area 62. In addition, when abnormal discharge occurs in the non-display area 62, the visible light generated by the abnormal discharge is prevented from propagating to the display area 61. The auxiliary partition wall 63 has a display area 61 and a non-display area during the exhaust process for exhausting air in the display area 61 to the outside and injecting inert gas necessary for discharge into the discharge space in the display area 61. The air flow path is formed at the upper or lower portion of the upper and lower portions, as shown in FIGS.

Referring to FIG. 8, the height of the auxiliary partition wall 63 is lower than that of the main partition wall 64. An opening 81 is formed on the auxiliary partition wall 63. The opening hole 81 forms an air flow path 82 during the exhaust process to smooth the air flow.

9 and 10, the opening hole 91 is formed in the upper end or the lower end of the auxiliary partition wall (63). Air passages 91 and 101 are formed in the exhaust process through the opening hole 91. Since the width of the opening hole 91 is smaller than that of the opening hole 81 shown in FIG. 8, the auxiliary partition wall 63 propagates from the display area 61 to the non-display area 62 and the non-display area. It is more advantageous to block visible light propagating from the area 62 to the display area 61.

The manufacturing process of the main partition 64 and the auxiliary partition 63 is as follows. 8 and 9, the height of the auxiliary partition 63 is lower than that of the main partition 64, or the groove is formed at the top of the auxiliary partition 63.

The process for forming the main partition 64 and the auxiliary partition 63 using the screen printing method is performed in a long time, after aligning the first screen on which the main partition pattern and the auxiliary partition pattern are formed on the lower substrate 72. 1 The glass paste is printed and dried on the lower substrate 72 through the screen. The printing and drying process of this glass paste is repeated up to the height of the auxiliary partition 63 or the height of the bottom of the groove for forming the opening holes 91 and 101. Subsequently, after the second screen on which the main bulkhead pattern is formed is aligned on the lower substrate 72, the glass paste is printed and dried on the lower substrate 72 through the second screen. Then, the stacking height of the glass paste is different between the portion corresponding to the main partition 64 and the portion corresponding to the auxiliary partition 63. Finally, when the firing process is performed, an auxiliary partition 63 having a groove formed in the center is formed at a height lower than the main partition 64 or at the same height as the main partition 64.

In the partition fabrication process using sandblasting, first, a glass paste is printed and dried on the lower substrate 72, and then a photoresist is printed thereon. Above the photoresist, a first mask for masking only the main partition wall portion is aligned. The photoresist is exposed and developed through the first mask to remove photoresist corresponding to a portion other than the main partition, thereby forming a first photoresist pattern on the glass paste. Subsequently, after the first mask is removed, the abrasive particles pressed using the sand blasting apparatus are ejected toward the photoresist pattern and the glass paste. At this time, the injection time of the abrasive grains is set so that the glass paste can be sputtered and removed by the abrasive grains by the height difference between the main partition 64 and the auxiliary partition 63. After the first photoresist pattern is removed, the photoresist is secondarily printed on the glass paste on which a part of the auxiliary partition wall is sputtered to a predetermined depth by a primary sputtering process on the lower substrate 72. On the photoresist, a second mask for masking the main and auxiliary partitions is aligned. The second photoresist pattern is formed by exposing and developing the photoresist through the second mask to remove photoresist corresponding to the discharge cell spaces other than the main and sub barrier parts. Subsequently, after the second mask is removed, the abrasive particles pressed using the sand blasting apparatus are ejected toward the second photoresist pattern and the glass paste. At this time, only glass pastes other than the second photoresist pattern are removed by sputtering with abrasive particles. Finally, when the second photoresist pattern is removed and the glass paste is fired, the main partition walls and the auxiliary partition walls having different heights are completed.

In addition to these manufacturing methods, the main partition 64 and the auxiliary partition 63 may be formed using the photosensitive paste method of exposing and developing the photosensitive paste to form a structure. In addition, the barrier rib manufacturing method according to the present invention forms a green sheet on a metal substrate, and the green sheet is molded into a mold, and the substrate is formed by LTCCM (Low Temperature Cofired Ceramic on Metal) to form a structure by low-temperature firing the molded green sheet It is also possible to form the main partition 64 and the secondary partition (63). In addition, the method for manufacturing a partition wall according to the present invention forms a dry film resist (DFR) on a substrate by a laminating process, and then forms the dry film resist to support the main partition wall 64 on the substrate. The partition 63 may be formed.

As described above, the partition wall of the PDP according to the present invention includes an auxiliary partition wall between the main partition walls to physically block propagation of space charge and visible light in the non-display area or at the boundary between the non-display area and the display area. It is formed in the width direction. As a result, the partition wall of the PDP according to the present invention prevents wall charges from accumulating on the non-display area by blocking space charges propagated from the display area to the non-display area, thereby suppressing abnormal discharge generated in the non-display area. Can be. Furthermore, even if an abnormal discharge occurs in the non-display area, the partition wall of the PDP according to the present invention prevents visible light generated by the abnormal discharge from propagating to the display area, thereby improving display quality.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (7)

A plurality of main partition walls for partitioning discharge cells of a display area for displaying an image, And an auxiliary barrier rib formed between the main barrier ribs adjacent to each other in the width direction of the main barrier rib to prevent abnormal discharge in a non-display area positioned outside the display region. The method of claim 1, And the auxiliary barrier rib is positioned in the non-display area. The method of claim 1, And the auxiliary barrier rib is positioned at a boundary between the display area and the non-display area. The method of claim 1, The auxiliary barrier rib is formed in the plasma display panel, characterized in that the opening hole is formed to form an air flow path between the display area and the non-display area. The method of claim 4, wherein And the auxiliary barrier rib is the same or lower than the main barrier rib. The method of claim 4, wherein The opening of the plasma display panel, characterized in that formed in any one of the top and bottom of the auxiliary partition wall. The method of claim 1, The main partition wall is formed in a stripe shape partition wall of the plasma display panel.