JP2965659B2 - Plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] A plasma display panel, which is magnetized as a plurality of spacers for defining a discharge gap, for the purpose of enhancing display brightness and facilitating manufacture. Are provided, and the directions of the respective magnetic fields are aligned in one direction.

[Industrial Application Field] The present invention relates to a plasma display panel.

Plasma display panels (PDPs) are superior in terms of luminance among flat display devices, and their applications are expanding to office automation equipment and the like.

Along with this, it is desired that the display brightness be further increased to improve the visibility, and that the display be cheaper.

[Conventional technology]

The dot matrix display type PDP, which displays characters and figures by combining dots (pixels) to emit light,
A pair of glass substrates are opposed to each other with a spacer interposed therebetween, and the discharge cells defined by the intersections of the electrodes facing each other in a grid pattern can selectively emit light. The spacers are provided at a plurality of positions avoiding each discharge cell in order to make the size of the discharge gap relating to display quality uniform over the entire display surface.

Conventionally, in a counter discharge type PDP in which an electrode is provided on each of a pair of glass substrates, a PDP in which a permanent magnet is provided for each discharge cell in order to increase the display brightness is known (Japanese Patent Application Laid-Open No. H10-139,878). 55-83130).

In a conventional PDP, a permanent magnet is provided between a glass substrate and an electrode, and generates a magnetic field in a direction perpendicular to the glass substrate surface or in a direction parallel to the glass substrate surface.

At the time of discharge, charged particles such as electrons moving in a discharge gap (discharge gas space) are deflected by passing through a magnetic field, and their movement paths are extended, so that the probability of collision with discharge gas molecules increases. As a result, the plasma density in the discharge cell increases.

[Problems to be solved by the invention]

Conventionally, in an AC-type PDP in which an AC discharge sustaining voltage is applied to the electrodes, a pair of electrodes facing each other in the discharge cell is made to correspond to each pair of electrodes in the discharge cell so that the discharge characteristics do not differ depending on the polarity of the applied voltage. Permanent magnets of the same magnetic force must be provided.

However, on the glass substrate on the display surface side, light shielding by the permanent magnet must be minimized, so that a permanent magnet having a large area cannot be provided. Therefore, a permanent magnet having a large area cannot be provided on the glass substrate on the back side.

For this reason, there is a problem that the range in which the magnetic force works effectively in the discharge cell is narrow, and the effect of improving the luminance by providing the permanent magnet is small. In particular, when the direction of the magnetic force of the permanent magnet is parallel to the surface of the glass substrate, the intensity of the magnetic field in the discharge cell decreases due to mutual interference between the permanent magnets provided in adjacent discharge cells.

In addition, a permanent magnet must be formed at a position corresponding to the intersection of the electrodes on the surface of the glass substrate, which is difficult to manufacture. Further, since a permanent magnet is separately provided, the number of manufacturing steps is large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to further increase display luminance and facilitate manufacturing.

[Means for solving the problem]

The PDP 1 according to the present invention is a plasma display panel 1 having a plurality of spacers 18 for defining a discharge gap 30, as shown in FIGS. Each spacer 18 is made of a magnetized member, and the direction of the magnetic field generated by each is arranged in one direction M1.

(Operation)

A magnetic field in the same direction is generated around each spacer 18.

Since the charged particles moving in the discharge gap 30 are deflected by the magnetic force and the movement path is extended, the probability of collision with the discharge gas molecules increases, ionization easily occurs, and the plasma density in the discharge cells increases.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a main part plan view showing the structure of a PDP 1 according to the present invention,
FIG. 2 is a sectional view taken along the line II-II of FIG.

In these figures, PDP1 is a glass substrate 1 on the display side.
1, a glass substrate 21 on the back side, a plurality of strip-shaped X electrodes 13 and Y electrodes 23 formed on the surface of each glass substrate 11, 21 and each electrode
It is composed of dielectric layers 15 and 25 covering the layers 13 and 23, a spherical spacer 18, and the like. In FIG. 1, the dielectric layers 15, 25
Are not shown. The surfaces of the dielectric layers 15 and 25 are covered with a protective film (not shown) made of MgO or the like.

Discharge space 30 whose gap size is defined by spacer 18
Is filled with a discharge gas in which Ne and Xe are mixed.
In FIG. 2, the upper surface of the glass substrate 11 becomes the display surface 11H.

The X electrode 13 and the Y electrode 23 are arranged so as to face each other in a grid pattern, and a discharge cell C is defined at the intersection.

In the PDP 1, each spacer 18 is made of a permanent magnet, and the arrangement direction of the magnetic poles (the direction of the generated magnetic field) is in the direction of the arrow M1, that is, the right side in FIG. 2 is the N pole and the left side is the S pole. As described above, one pixel is provided at the center of each area defined by the X electrode 13 and the Y electrode 23, that is, at each of the four corners of the matrix display element (pixel). As a result, a strong magnetic field from the N pole to the S pole is generated between the spacers 18 on both sides of the discharge cell C in each discharge cell C. This magnetic field is substantially uniform among all the discharge cells C in the display surface 11H.

When manufacturing such a PDP 1, first, chromium is deposited on the display-side glass substrate 11 by sputtering evaporation.
Copper and chromium are laminated in this order to form a three-layer metal thin film (film thickness is
The metal thin film is patterned by photolithography to form an X electrode 13. At this time, the spacer 18 is located at the position where the spacer 18 is provided.
May be formed in advance.

Subsequently, a low-melting glass paste such as lead glass is applied on a glass substrate so as to cover the X electrode 13, and the low-melting glass paste is baked at a temperature of about 580 ° C. to form a dielectric layer 15 (having a thickness of about 20 μm). ) Is formed.

Next, a spacer 18 that has been magnetized in advance is placed at a predetermined position on the dielectric layer 15 by a screen printing method. Subsequently, an arrow M1 is drawn over the entire surface of the glass substrate 11 by an electromagnet or the like.
A magnetic field having a strong direction is generated, and the direction of the magnetic pole of each spacer 18 is aligned with the direction M1. At this time, since the spacer 18 is spherical, the spacer 18 can be rotated in an arbitrary direction while the center position is held by the printing paste.

Then, heat treatment is performed to soften the dielectric layer 15, and the spacers 18 are fixed by fusion.

Thereafter, the glass substrate 11 on which a protective film made of MgO is deposited so as to cover the dielectric layer 15 and the glass substrate 21 on the rear side on which a Y electrode 23, a dielectric layer 25, etc.
The PDP 1 is completed by superposing the 13 and the Y electrodes 23 so as to face each other in a grid pattern, sealing with a sealing glass, filling a discharge gas 30, and the like.

When displaying PDP1, select X electrode 13 and Y electrode
A voltage exceeding the discharge starting voltage is applied to 23, and the discharge cell C is selectively discharged. Once the discharge occurs, wall charges are generated in the dielectric layers 15 and 25, so that the discharge cells C can be discharged with a discharge sustaining voltage lower than the discharge starting voltage.

In the discharge cell C during discharge, the discharge gas enters a plasma state accompanied by light emission. At this time, the electrons moving in the discharge gap 30 are deflected by the magnetic field generated by the spacer 18, and the moving path is longer than when there is no magnetic field, so that the probability of collision with the discharge gas molecules during the movement increases. As a result, the plasma density is increased and the luminance of light emission is increased.

According to the above-described embodiment, after placing the magnetized spacer 18 in advance, it is necessary to provide a permanent magnet for generating a uniform magnetic field for each discharge cell C only by aligning the magnetic pole directions of the spacer 18. And the production of PDP1 is easy.

In the above-described embodiment, the permanent magnet may be formed by magnetizing the spacer 18 after placing it.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, while luminance of a display can be raised more, manufacture can be aimed at.

[Brief description of the drawings]

 FIG. 1 is a plan view of a principal part showing a structure of a PDP according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. In the figure, 1 is a PDP (plasma display panel), 13 is an X electrode (electrode), 18 is a spacer, 23 is a Y electrode (electrode), 30 is a discharge gap, C is a discharge cell, and M1 is a direction (direction of a magnetic pole). It is.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-83130 (JP, A) JP-A-61-275881 (JP, A) JP-A-4-4543 (JP, A) 36952 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 11/00-11/02 H01J 17/14

Claims (1)

(57) [Claims] 1. A plasma display panel having a plurality of spacers for defining a discharge gap, wherein each of said spacers is made of a magnetized member, and a direction of a magnetic field generated by each is aligned in one direction. A plasma display panel characterized by the above-mentioned.