KR20050102390A - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel that can reduce abnormal discharge generated from a non-display area.

According to an embodiment of the present invention, a plasma display panel includes: a plurality of main partition walls for distinguishing a discharge space of a display area for displaying an image; A subsidiary partition wall disposed in a non-display area outside of the display area and configured to distinguish a dummy discharge space of the non-display area; The dummy discharge space is reduced as it moves away from the display area.

Description

Plasma Display Panel {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 plasma display panel capable of reducing 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 real material not shown.

The PDP is time-divisionally driven by dividing one frame into several subfields having different number of emission times in order to implement grayscale of an image. Each subfield is divided into an initialization period (or a reset period) for initializing the full screen, an address period for selecting a scan line and a cell in the selected scan line, and a sustain period for implementing gradation 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 in 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).

Meanwhile, as illustrated in FIGS. 3 and 4, the PDP has an upper non-display area 32 located at an upper outer side of an active area 31 on which an image is displayed, and a lower non-display area located at a lower outer side. Each of the discharge spaces having the same structure as that of the discharge cells of the display area 31 is formed in each of the 33 regions. That is, each of the upper non-display area 32 and the lower non-display area 33 includes the address electrode X, the upper / lower Y dummy electrodes UY1, UY2, BY1, BY2, and the upper / lower Z dummy electrodes UZ1, UZ2, BZ1 and BZ2 are formed and dielectric layers 4 and 6 are formed to cover the electrodes X, UY1, UY2, BY1, BY2, UZ1, UZ2, BZ1 and BZ2.

The dummy electrodes UDE and BDE formed in each of the upper non-display area 32 and the lower non-display area 33 generate a discharge in the non-display areas 32 and 33 during the aging process. The discharge characteristics of the discharge cells of the first horizontal line and the nth horizontal line of the display area 31 are stabilized under the same conditions as the other discharge cells of (31). To this end, a voltage capable of discharging during the aging process is applied to the upper / lower dummy electrodes UDE and BDE, and no voltage is applied after the aging process.

However, the conventional PDP has a problem that an accidental abnormal discharge occurs from the upper non-display area 32 and the lower non-display area 33. In detail, when a discharge such as an initialization discharge, an address discharge, and a sustain discharge occurs during the operation of the PDP, the space charges generated by the discharge are generated on the dielectric of the upper non-display area 32 and the lower non-display area 33. It is stored. For example, as shown in FIG. 4, when the address discharge is performed, the negative scan pulse scan is sequentially shifted to the scan electrodes Y1 to Yn, so that the positive space charge 53 moves toward the lower non-display area 33. At the same time, the negative space charge 51 moves toward the upper non-display area 32. The space charges 51 and 53 moved to the non-display areas 32 and 33 cover the electrodes of the display area 31 in the non-display areas 32 and 33 and adjacent to the non-display areas 32 and 33. Accumulate on dielectric layers 4 and 6. As such, when the wall voltage of the discharge space rising due to the wall charges accumulated on the non-display areas 32 and 33 and the display area 31 adjacent to the non-display areas 32 and 33 is greater than or equal to a voltage capable of causing discharge, the non-display area ( An abnormal discharge occurs accidentally in the 32 and 33 and the display area 31 adjacent thereto.

As a result of this abnormal discharge, visible light 48 generated from the upper and lower edges of the non-display areas 32 and 33 or the display area 31 adjacent thereto is visible to the viewer. In severe cases, an abnormal discharge may render the PDP unable to display an image for several seconds and may even damage the discharge cell.

Accordingly, an object of the present invention is to provide a plasma display panel which can reduce abnormal discharge generated from a non-display area.

In order to achieve the above object, the plasma display panel according to an embodiment of the present invention comprises a plurality of main partitions for separating the discharge space of the display area for displaying an image; A subsidiary partition wall disposed in a non-display area outside of the display area and configured to distinguish a dummy discharge space of the non-display area; The dummy discharge space is reduced as it moves away from the display area.

The auxiliary partition wall may include a first partition wall extending from the main partition wall; And a second partition wall intersecting the first partition wall and positioned between the first partition walls.

The dummy discharge space is reduced in at least one of a width direction and a length direction as the dummy discharge space moves away from the display area.

At least one of the first and second barrier ribs may be wider as it moves away from the display area.

The first and second partitions have the same width as the main partition.

A sustain electrode pair crossing the main partition wall in the discharge space of the display area; An address electrode intersecting with the sustain electrode pair is formed.

In the dummy discharge space, a dummy electrode formed on the same plane as the sustain electrode pair and intersecting the address electrode is formed.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 6 to 9.

FIG. 6 is a plan view illustrating a partition wall of a PDP according to the first embodiment of the present invention, and FIG. 7 is a discharge cell and a dummy discharge cell cut along the lines "1-1" and "2-2" in FIG. 6. It is sectional drawing which shows.

6 and 7, a PDP according to the present invention is provided for partitioning a display area, a non-display area disposed outside the top or bottom of the display area, and discharge cells AP positioned in the display area. The main partition 60 and the auxiliary partition 62 for partitioning the dummy discharge cell DP located in the non-display area are provided.

The display area includes a sustain electrode pair including the scan electrode Y and the sustain electrode Z, and an address electrode X formed to be orthogonal to the sustain electrode pair.

Each of the scan electrode Y and the sustain electrode Z is composed of a transparent electrode and a metal bus electrode formed thereon. An upper dielectric layer 106 and an MgO protective layer 107 are stacked on the upper substrate 101 on which the scan electrode Y and the sustain electrode Z are formed. The lower dielectric layer 104 is formed on the lower substrate 102 on which the address electrode X is formed to cover the address electrode X. FIG. The main partition wall 60 is formed on the lower dielectric layer 104 in a direction parallel to the address electrode X. Phosphors 105 are formed on the surfaces of the lower dielectric layer 104 and the main partition wall 60. An inert mixed gas such as He + Xe, Ne + Xe, He + Xe + Ne is injected into the discharge space provided between the upper substrate 101, the lower substrate 102, and the main partition wall 60. The upper substrate 101 and the lower substrate 102 are bonded by a real material not shown.

The main partition wall 60 prevents crosstalk between adjacent cells electrically and optically by distinguishing red, green, and blue discharge spaces. To this end, the main partition wall is formed in a stripe form or a fish-born (fish-born) having a projection derived from the stripe-shaped partition wall or formed in the same closed shape as the auxiliary partition (62).

The non-display areas are respectively disposed outside at least one of the top and bottom of the display area. On the upper substrate 101 of each of the upper non-display area and the lower non-display area, dummy electrodes UD1, UD2, BD1, and BD2 are formed on the same plane as the sustain electrode pairs Y and Z of the display area. The upper dielectric layer 106 and the passivation layer 107 are formed to cover the dummy electrodes UD1, UD2, BD1, and BD2. On the lower substrate 102 of each of the upper non-display area and the lower non-display area, an address electrode X of the display area is formed to extend, and a lower dielectric layer 104 is formed to cover the address electrode X. An auxiliary partition 62 is formed thereon, and a phosphor layer 105 is formed on the surfaces of the lower dielectric layer 104 and the auxiliary partition 62.

The auxiliary partition wall 62 is formed in a closed shape having a first partition 62a extending from the main partition 60 and parallel to the main partition 60, and a second partition 62b intersecting the first partition 62a. do. The first partition 62a of the closed auxiliary partition 62 separates dummy discharge cells DP left and right adjacent to each other with the first partition 62a interposed therebetween, and the second partition 62b is formed in the display area. The discharge cells AP are distinguished from the dummy discharge cells DP in the non-display area, and the dummy discharge cells DP vertically adjacent to each other are separated by the second partition 62b.

The dummy discharge spaces of the dummy discharge cells DP divided by the auxiliary partition walls 62 gradually decrease in area from the display area. To this end, the widths of the first and second partitions 62a and 62b are the same as the width of the main partition wall 60, and the dummy discharge spaces of the dummy discharge cells vertically adjacent to each other with the second partition 62b interposed therebetween. (L1> L2> L3) In this case, when the area of the dummy discharge space closest to the display area is 100%, the area of the dummy discharge space farthest from the display area may be 0%. Do.

The auxiliary partition wall 62 prevents space charges generated in the display area from moving to the non-display area during the initial discharge, the address discharge, and the sustain discharge. In addition, the auxiliary partition wall 62 prevents the visible light generated by the abnormal discharge from propagating to the display area when the abnormal discharge occurs in the non-display area. In particular, the dummy discharge space provided by the auxiliary partition wall 62 gradually decreases, thereby reducing the probability of abnormal discharge occurring in the non-display area.

This will be described with reference to FIG. 7. For example, as the scan pulses of the negative polarity are sequentially shifted to the scan electrodes Y1 to Yn during the address discharge, the positive spatial charge 113 is moved toward the lower non-display area as shown in FIG. 7. At the same time, the negative space charge 111 moves toward the upper non-display area. Since the space charge to be moved to the non-display area is blocked by the closed auxiliary partition wall 62 of the non-display area, deterioration in image quality due to abnormal discharge can be prevented.

8 is a plan view illustrating a partition wall of a PDP according to a second embodiment of the present invention.

Referring to FIG. 8, the partition wall of the PDP according to the second embodiment of the present invention is wider as the width of the first partition wall of the auxiliary partition wall is farther from the display area than the partition wall shown in FIG. It has the same components except that it gradually decreases. Accordingly, detailed description of the same components will be omitted.

The dummy discharge spaces of the dummy discharge cells DP divided by the auxiliary partition walls 62 gradually decrease in area from the display area. To this end, the width of the second partition 62b of the auxiliary partition 62 is constant, while the width of the first partition 62a is wider as it moves away from the display area. Accordingly, the width of the dummy discharge space gradually decreases as the dummy discharge spaces of the dummy discharge cells DP move away from the display area. (W1> W2> W3) In this case, the dummy discharge space closest to the display area When the area is 100%, the area of the dummy discharge space furthest from the display area may be 0%.

In addition, while the width 62a of the first partition wall is constant, the width of the second partition wall 62b gradually increases as the distance from the display area increases, so that the discharge space of the dummy discharge cells DP gradually decreases in the longitudinal direction. You may.

The auxiliary partition wall 62 prevents space charges generated in the display area from moving to the non-display area during the initial discharge, the address discharge, and the sustain discharge. In addition, the auxiliary partition wall 62 prevents the visible light generated by the abnormal discharge from propagating to the display area when the abnormal discharge occurs in the non-display area.

9 is a plan view illustrating a partition wall of a PDP according to a third embodiment of the present invention.

Referring to FIG. 9, the partition of the PDP according to the third embodiment of the present invention has the same components except that the dummy discharge space is reduced in the longitudinal direction and the width direction as compared with the partition shown in FIG. 6. Accordingly, detailed description of the same components will be omitted.

The dummy discharge spaces of the dummy discharge cells DP divided by the auxiliary partition walls 62 gradually decrease in area from the display area. To this end, the widths of the first and second partitions 62a and 62b become wider as they move away from the display area. Accordingly, the dummy discharge spaces of the dummy discharge cells DP gradually decrease in the width direction and the longitudinal direction of the dummy discharge cells DP (L1> L2> L3, W1> W2> W3). When the area of the adjacent dummy discharge space is 100%, the area of the dummy discharge space furthest from the display area may be 0%.

The auxiliary partition wall 62 prevents space charges generated in the display area from moving to the non-display area during the initial discharge, the address discharge, and the sustain discharge. In addition, the auxiliary partition wall 62 prevents the visible light generated by the abnormal discharge from propagating to the display area when the abnormal discharge occurs in the non-display area.

As described above, in the plasma display panel according to the present invention, a barrier rib having a closed shape is formed in the non-display area to block propagation of space charges generated in the display area to the non-display area. The closed discharge space provided by the closed partitions gradually decreases away from the display area. Accordingly, the abnormal discharge generated in the non-display area can be prevented, and the fire compartment is improved by preventing the visible light generated by the abnormal discharge from propagating to the display area.

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.

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 plan view illustrating a partition of a plasma display panel according to a first embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a display area and a non-display area of the plasma display panel taken along the lines "1-1" and "2-2" in FIG. 6.

8 is a plan view illustrating a partition of a plasma display panel according to a second exemplary embodiment of the present invention.

9 is a plan view illustrating a partition of a plasma display panel according to a third exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1,101: upper substrate 2,102: lower substrate

3,60,62: partition 4,6,104,106: dielectric layer

5,105 phosphor 7,107: protective layer

70: projection X: address electrode

Y: scan electrode Z: sustain electrode

Claims (7)

A plurality of main bulkheads for distinguishing a discharge space of a display area for displaying an image; A subsidiary partition wall disposed in a non-display area outside of the display area and configured to distinguish a dummy discharge space of the non-display area; And the area of the dummy discharge space gradually decreases away from the display area. The method of claim 1, The secondary partition wall A first partition wall extending from the main partition wall; And a second partition wall intersecting the first partition wall and positioned between the first partition walls. The method of claim 2, And the dummy discharge space decreases in at least one of a width direction and a length direction as the dummy discharge space moves away from the display area. The method of claim 2, At least one of the first and second barrier ribs is wider as it moves away from the display area. The method of claim 2, And the first and second barrier ribs have the same width as the main barrier rib. The method of claim 1, In the discharge space of the display area A pair of sustain electrodes crossing the main partition wall; And an address electrode intersecting the sustain electrode pair. The method of claim 6, In the dummy discharge space And a dummy electrode formed on the same plane as the sustain electrode pair and intersecting the address electrode.