JP2000021313A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce resistance of sustained electrode pairs without reducing the opening ratio of a unit light emitting area by projecting the part where a metallic film of main electrode pairs arranged on a front side board crosses a barrier plate, toward at least adjacent discharge electrode pairs. SOLUTION: Surface discharge main electrode pairs (sustained electrodes) X, Y composed of a transparent conductive film 41 and a metallic film 42 overlapping with this, are arranged on a front side board of board pairs forming a discharge space 30, and a barrier plate 29 in the direction for crossing the main electrode pairs X, Y is arranged in the discharge space 30. The transparent conductive film 41 is formed by patterning an ITO thin film, and the metallic film (a bus electrode) 42 is formed by steaming/patterning a three-layer structure of chroming/copper/chromium over the almost whole surface of the front side board. This metallic film 42 is formed so as to have the straight line part 42A having a uniform width overlapping with the outside end part of the transparent conductive film 41 and the projecting part 42B where the part crossing the barrier plate 29 has a width narrower than the barrier rib 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a surface discharge type plasma display panel (PDP), and more particularly, to a surface discharge type PDP for displaying a large screen.

[0002]

2. Description of the Related Art Surface discharge type PDPs have been commercialized as color display devices for televisions and computer systems. Although the screen size has reached 50 inches, a larger screen is desired in the market. PDP
Is a flat display device including a pair of substrates provided with components such as electrodes as is well known. A surface discharge type PDP includes a pair of main electrodes serving as an anode and a cathode in a discharge for securing luminance. This is a PDP that is arranged in parallel on the same substrate and configured to generate surface discharge along the substrate surface. Although a structure in which the main discharge is shared between adjacent lines is also known, basically, a pair of main electrodes is arranged for each line, and the total number is 2n (n is the number of lines). In the surface discharge type PDP, the phosphor layer for color display is provided on the other substrate opposite to the substrate provided with the main electrode, so that deterioration of the phosphor layer due to ion bombardment during discharge can be reduced. it can. An arrangement in which the phosphor layer is arranged on the substrate on the back side is called "reflection type", and an arrangement in which the phosphor layer is arranged on the substrate on the front side is called "transmission type". For higher luminance, a reflection type in which the front surface of the phosphor layer is a light emitting surface is advantageous.

In a reflection type surface discharge type PDP, a main electrode is arranged on a front substrate. In order to avoid blocking of the display light, the main electrode needs to be a transparent electrode. But I
The conductivity of transparent conductive materials such as TO and Nesa is insufficient for practical use. Therefore, in the surface discharge type PDP, a laminated body of a transparent conductive film and a metal film that supplements conductivity is used as a main electrode.

FIG. 6 is a plan view showing a structure of a main electrode pair of a conventional surface discharge type PDP 60. As shown in FIG. In the PDP 60, a pair of band-shaped main electrodes (sustain electrodes) Xi and Yi are arranged for each matrix display line. Each of the sustain electrodes Xi and Yi is composed of a transparent conductive film (transparent electrode) 81 and a metal film (bus electrode) 82 having a smaller width. Screen area E where discharge cells are arranged vertically and horizontally
, The transparent electrode 81 and the bus electrode 82 have a linear band shape. The bus electrode 82 is overlapped with the transparent electrode 81 so as to approach the edge opposite to the gap (surface discharge gap) G between the transparent electrodes 81 in order to minimize the amount of light shielding. The bus electrodes 82 of the sustain electrodes Xi and Yi are distributed right and left to extend from the screen area E to near the edge of the substrate for connection to an external drive circuit. It is patterned into a suitable shape (bent band, etc.).

[0005]

In a conventional PDP, a bus electrode in a main electrode pair supplies a current required for discharging a plurality of discharge cells on the main electrode pair. For this reason, as the screen size of the PDP increases and the length of the main electrode pair increases accordingly, the current flowing through the bus electrode increases, and the voltage drop due to the electrical resistance of the bus electrode and the resulting applied voltage As a result, the luminance of the entire screen is reduced, and the discharge becomes unstable.

Further, as the number of discharge cells on one main electrode pair increases due to the enlargement of the screen of the PDP, the difference between the case where the number of discharge cells to emit light is large and the case where the number of discharge cells is small increases. Therefore, in the case of a display in which the number of discharge cells to emit light on one main electrode pair is large, the voltage drop due to discharge is large compared to the display in the case of a small number, and the applied voltage is greatly reduced. Luminance is reduced, and variation in light emission luminance occurs depending on display contents.

As a method of solving these problems, there is a method of reducing the resistance of the bus electrode by widening the width of the bus electrode. However, when the bus electrode is spread to the slit portion (portion where surface discharge occurs), the bus electrode is enlarged. The light emission of the discharge cells is blocked by the bus electrode portion, so that the aperture ratio, which is the ratio of the light-transmitting portion in the unit light-emitting region, becomes small, and the luminous efficiency decreases. Also, when the bus electrode is extended toward the reverse slit portion (the portion between the main electrode pairs where surface discharge cannot occur), the discharge at the slit portion spreads to the reverse slit portion, and the discharge cell adjacent to the address electrode in the extending direction extends. During this time, discharge interference occurs.

The present invention has been made in view of such circumstances, and without reducing the aperture ratio of the unit light emitting region,
Also, without causing discharge interference between adjacent discharge cells,
It is intended to reduce the resistance of the bus electrode.

[0009]

According to a first aspect of the present invention, there is provided a plasma display panel for a surface discharge comprising a transparent conductive film and a metal film overlapping the transparent conductive film on a front substrate of a pair of substrates forming a discharge space. In a plasma display panel in which a main electrode pair group is arranged and a partition wall in a direction intersecting with the main electrode pair is disposed in the discharge space, the metal film of the main electrode pair has at least an intersection portion with the partition wall. A plasma display panel formed so as to protrude toward an adjacent discharge electrode pair.

[0010] In the plasma display panel according to the second aspect of the present invention, the protruding shape of the metal film is a shape that becomes narrower toward the tip. In short, the present invention provides a unit having a size that is hidden by the partition only at the intersection with the partition where discharge does not occur, when the width of the bus electrode is increased to reduce the resistance of the bus electrode. This does not impair the aperture ratio of the light emitting region.

[0011]

FIG. 1 shows a PDP 1 according to the present invention.
It is a perspective view which shows the internal structure of No. 0. The PDP 10 is an AC-driven PDP having a three-electrode surface discharge structure, and includes a front glass substrate 11 on a display surface side and a main electrode pair (sustain electrode) for generating a surface discharge extending adjacent to each other in a direction parallel to the horizontal direction. ) X, Y, dielectric layer 17 covering sustain electrode pairs X, Y, protective film 18 made of MgO, rear glass substrate 2
1. Address electrodes A for generating an address discharge orthogonal to the sustain electrode pairs X and Y, stripe-shaped barrier ribs 29 formed so as to sandwich the address electrodes A, and fluorescent light of a predetermined emission color (R, G, B) It is composed of body layers 28R, 28G, 28B and the like.

The internal discharge space 30 is partitioned by a partition wall 29 into unit light emitting regions in the extending direction of the pair of sustain electrodes X and Y. The discharge space 30 is filled with a discharge gas for exciting the phosphor layer 28 with ultraviolet rays. In the PDP 10, as shown in each of the three unit light-emitting regions associated with one pixel (pixel), an intersection of one sustain electrode Y used as a scan electrode and an address electrode A as a data electrode is provided. In this example, a selected discharge cell for selecting display or non-display is defined, and a main discharge cell (surface discharge cell) is defined between the pair of sustain electrodes X and Y near the selected discharge cell.

The phosphor layer 28 is formed on a rear glass substrate 21 opposite to the front glass substrate 11 on which the sustain electrode pairs X and Y are provided, in order to avoid ion bombardment due to surface discharge.
It is provided between the upper partition walls 29 so as to cover the surface of the dielectric layer and the side surfaces of the partition walls, and emits light when excited by ultraviolet rays generated by surface discharge of the main discharge cells. Light emitted from the surface layer of the phosphor layer 28 (the surface in contact with the discharge space 30) passes through the protective layer 18, the dielectric layer 17, the front glass substrate 11, and the like, and is emitted from the display surface to the outside.

In the PDP 10, the emission colors of the phosphor layers 28 corresponding to the three unit emission regions are red (R),
The colors are green (G) and blue (B). At the time of display, first, for example, as writing over the entire display surface, a voltage exceeding the discharge start voltage is applied to one of the sustain electrodes X for all the sustain electrode pairs, and a surface discharge (dielectric material) is simultaneously performed in the unit light emitting region EU. (Discharge in the surface direction of the layer 17). When a surface discharge occurs, wall charges having a polarity opposite to the applied voltage are accumulated in the dielectric layer 17 on each of the sustain electrode pairs X and Y. Next, in a state where a discharge sustaining voltage lower than the discharge starting voltage is applied to the other sustain electrode Y, an address discharge is generated between the sustain electrode Y and the address electrode A selected according to the display pattern. An appropriate charge accumulation state is formed by this address discharge.

After that, a sustaining voltage is alternately applied to each of the sustain electrode pairs X and Y. Thus, in the unit light emitting region EU in which a predetermined amount of wall charge is accumulated, strong light emission is generated every time the discharge sustaining voltage is applied. At this time, the luminance can be adjusted by appropriately selecting the period of application of the sustaining voltage. As shown in FIG.
The sustain electrode pair X, Y, which is a feature of the present invention, is made of ITO.
Pattern the thin film to form a transparent conductive film (transparent electrode) 41
, Followed by, for example, chromium-copper-chromium 3
A metal thin film having a layer structure is formed by vapor deposition on almost the entire surface of the front glass substrate 11 and patterning it by photography. Here, the planar shape of the transparent electrode 41 is a band shape having a uniform width, but the metal film (bus electrode) 42 has a portion intersecting with the partition wall 29 protruding from other portions according to the feature of the present invention. It is shaped.

That is, the bus electrode 42 is connected to the transparent electrode 41.
A linear portion 42A having a uniform width overlapping the outer end of the partition wall 2;
9 and a protrusion 42B having a width smaller than that of the partition 29. The protrusion 42B of the bus electrode 42
It is possible to protrude to the extent that it does not affect adjacent sustain electrodes. Specifically, the slit side (the side that causes discharge) has a length that does not exceed the width of the transparent electrode,
The length of the reverse slit side (the side on which no discharge occurs) can be set to such a length that discharge coupling does not occur between adjacent discharge cells.
The projection 42B of the bus electrode 42 allows the bus electrode 42
Can be reduced.

If the bus electrode 42 is made dark to have a light absorbing property, the linear portion 42A of the bus electrode 42 and the projection 4
2B is a black lattice shape that surrounds the discharge cells in plan view, and thus can function as a so-called black matrix. FIG. 3 is a plan view showing the structure of the sustain electrode pairs X and Y of the PDP according to the second embodiment of the present invention.

The projecting portions 42B of the same width are provided in the bus electrodes 42 of the pair of sustain electrodes X and Y of the previous embodiment (first embodiment), but the buses of the pair of sustain electrodes X and Y of the second embodiment are provided. The protruding portion provided on the electrode 42o is formed so as to become narrower toward the distal end portion. This allows
When assembling the PDP, the required accuracy of alignment of the bus electrode 42o can be reduced.

FIGS. 4 and 5 are plan views showing the structures of the sustain electrodes X and Y according to the third and fourth embodiments of the present invention. The bus electrode 42p of the sustain electrode pair X, Y of the third embodiment is formed such that the protrusion on the slit side is shorter than the protrusion on the reverse slit side, and the bus electrode 42q of the sustain electrode X, Y of the fourth embodiment is , No protrusion on the slit side is formed. In these embodiments, the influence of the protrusions on the discharge cells can be reduced.

The present invention is not limited to the above embodiment.

[0021]

According to the present invention, it is possible to reduce the resistance of the sustain electrode pair without lowering the aperture ratio of the unit light emitting region. Therefore, it is possible to improve the display quality even in a large display PDP. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an internal structure of a PDP according to the present invention.

FIG. 2 is a plan view showing a structure of a sustain electrode of the PDP according to the present invention.

FIG. 3 is a plan view showing a structure of a sustain electrode of a PDP according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a structure of a sustain electrode of a PDP according to a third embodiment of the present invention.

FIG. 5 is a plan view showing a structure of a sustain electrode of a PDP according to a fourth embodiment of the present invention.

FIG. 6 is a plan view showing a structure of a sustain electrode of a conventional surface discharge type PDP 60.

[Explanation of symbols]

10, 60: PDP (plasma display panel) 11, 21: glass substrate 29: partition wall 30: discharge space 41, 81: transparent conductive film (transparent electrode) 42, 52a, 52b, 52c, 82: metal film (bus electrode) A: address electrode E: display surface X, Y: main electrode pair (sustain)

Claims (2)

[Claims] 1. A main electrode pair group for a surface discharge comprising a transparent conductive film and a metal film overlapping the transparent conductive film is disposed on a front substrate of a substrate pair forming a discharge space, and intersects with the main electrode pair. In the plasma display panel in which a partition in the direction is arranged in the discharge space, the metal film of the main electrode pair is formed such that an intersection with the partition projects at least toward an adjacent discharge electrode pair. A plasma display panel characterized by the above-mentioned. 2. The metal film according to claim 1, wherein the protruding shape of the metal film is a shape that becomes narrower toward the tip.
The plasma display panel as described in the above.