JP3080678B2 - Plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP) capable of displaying various colors by providing a phosphor.

[0002] A matrix display type PD for displaying characters and figures by combining dots (pixels) to emit light
P seals the periphery of the pair of substrates to form a discharge space therein, and selectively discharges each discharge cell defined at or near the intersection of the display electrode group arranged in a grid. Be composed.

Conventionally, as a matrix display type PDP, a surface discharge type PDP which displays a color other than the emission color of a discharge gas by using a phosphor has been known.

[0004]

2. Description of the Related Art For example, a surface discharge type PDP of a three-electrode type.
Has a plurality of pairs of display electrodes, which are arranged adjacent to each other in parallel on one substrate, and a plurality of address electrodes arranged to be orthogonal to each pair of electrodes. In the unit light emitting area, a selected discharge cell for selecting display or non-display is defined at an intersection of one display electrode and the address electrode, and a main discharge is provided in a portion of each display electrode in the vicinity of the selected discharge cell. A cell is defined.

The phosphor is usually provided on the other substrate so as to oppose the electrode pair via a discharge space in order to avoid ion bombardment due to discharge, and is excited by ultraviolet rays generated by surface discharge of the main discharge cell. To emit light. When performing color display or multicolor display, a plurality of unit light emitting regions are associated with one dot, and phosphors having different emission colors are provided in each of the unit light emitting regions.

In a PDP called a transmission type in which a phosphor is provided on a substrate on the display surface side, of the light emitted on the surface layer of the phosphor (the surface in contact with the discharge space), the light is transmitted through the inside of the phosphor. Display is performed by light appearing on the surface. In a PDP called a reflection type in which a phosphor is provided on a substrate on the back side, display is performed by light emitted from the surface of the phosphor to a discharge space.

In the reflection type PDP, the display electrodes are:
Since it is disposed on the display surface side with respect to the phosphor, it is a transparent electrode made of a Nesa film, an ITO film, or the like in order to increase display brightness. Then, an auxiliary metal electrode (bus electrode) for supplementing conductivity is superimposed on the transparent electrode.

[0008] Generally, a screen printing method is used for forming a phosphor. That is, the phosphor is formed by printing a paste mixed with a fluorescent substance in a predetermined pattern using a screen mask, and then firing the paste. When providing a plurality of phosphors having different emission colors,
The paste is printed in order for each color.

According to the screen printing method, the number of manufacturing steps is small and the productivity is advantageous as compared with the case where a photolithography method is used. Are not mixed, and the turbidity of the display color can be prevented.

[0010]

However, when the phosphor is formed by screen printing, the area of the phosphor (printing area) corresponding to each unit light emitting region tends to vary. For this reason, in the related art, there has been a problem that the display brightness and the display color become non-uniform in the display surface and display quality is impaired.

For example, when a unit light-emitting region provided with a red phosphor and a unit light-emitting region provided with a green phosphor adjacent thereto are simultaneously illuminated to display yellow, if the red phosphor is provisionally used. When the light-emitting area of is smaller than normal, the display color becomes yellow-green.

The present invention has been made in view of the above-mentioned problems, and has as its object to make display luminance and display color uniform by making the light emitting area in a unit light emitting area constant.

[0013]

[0014]

Means for Solving the Problems The P according to the first aspect of the present invention.
DP is a pair of transparent electrodes 1 on the substrate 11 on the display surface H side.
In the matrix display type plasma display panel 1 having the phosphors 38 on the rear substrate 21 having the light-transmissive windows 15W having a constant area for each unit light-emitting region EU, A light-shielding layer 15 is provided so as to overlap with each of the transparent electrodes 13 and 14.

[0015]

In each unit light emitting region EU, a region in the light transmitting window 15W provided in the light shielding layer 15 is a light emitting region. That is, display is performed by light emitted from the light transmitting window 15W to the display surface H out of the light emitted by the phosphor 38, and the other light is shielded from the display surface H.

A light-shielding layer 15 made of a metal film is provided so as to overlap with each of the transparent electrodes 13 and 14, and
It also has a function as an auxiliary metal electrode (bus electrode) that supplements the conductivity of 3, 14.

[0017]

1 is an exploded perspective view showing the structure of a PDP 1 according to the present invention, and FIG. 2 is a plan view showing the structure of a main part of the PDP 1 of FIG.

The PDP 1 is composed of a pair of glass substrates 11 and 21 opposed to each other via a discharge space 30 and a pair of strip-shaped transparent electrodes 13 and 14. Metal electrode layer 1 described later
5. Dielectric layer 17 for generating surface discharge between transparent electrodes 13 and 14 by AC (AC) driving, discharge space 30
, A grid-shaped partition wall 19 for partitioning the unit light-emitting areas EU, a strip-shaped partition wall 29 provided on the glass substrate 21 on the rear side,
It is composed of an address electrode 22 orthogonal to the transparent electrodes 13 and 14, a phosphor 38 of a predetermined emission color, and the like.
P.

The phosphors 38 are provided one by one for each unit light emitting area EU by a screen printing method. The partition 19 is a dark member such as a low-melting glass mixed with a black pigment in order to increase the contrast of display.

The feature of the PDP 1 of the present embodiment is the planar shape of the metal electrode layer 15 provided as a bus electrode on each of the transparent electrodes 13 and 14. That is, as is well shown in FIG. 2, each hatched metal electrode layer 15 has a translucent window portion 15W in which the center side is cut off in a semi-elliptical shape for each unit light emitting region EU. It has a band shape, and its width is about the same as or larger than the transparent electrodes 13 and 14.

That is, the metal electrode layer 15 has a discharge gap (the transparent electrode 13,
14 gap) and a region excluding the inside of the light transmitting window 15W. Such a metal electrode layer 15
Is formed, for example, by patterning a thin film having a three-layer structure of chromium-copper-chromium.

The translucent window 15W is provided inside the region where the phosphor 38 is formed, and its area is equal between the unit light emitting regions EU.

In the PDP 1 configured as described above, since the area of the phosphor 38 that can be seen through the display surface H is defined by the metal electrode layer 15, the area of the formation region of the phosphor 38 varies. In this case, the light emitting area on the display surface H is uniform among the unit light emitting regions EU.

Thus, when a multi-color matrix display is performed by associating a plurality of unit light-emitting areas EU having different light-emitting colors with one dot, the display color and luminance between the dots become uniform, and Also, even when displaying a single color, the brightness between the dots becomes uniform.

According to the above-described embodiment, the transparent electrodes 13, 1
The light-shielding of the display surface H is performed by the metal electrode layer 15 as a bus electrode that supplements the conductivity of the fourth embodiment, so that the light-emitting area is made uniform by changing the planar shape of the bus electrode and using the same number of manufacturing steps as before. PDP1 can be manufactured.

FIG. 3 shows a PDP 2 according to another embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the structure of FIG. In the figure, components having the same functions as those in FIG. 1 are denoted by the same reference numerals, regardless of their shape, arrangement, and difference in material.

The PDP 2 is a so-called transmission type PDP in which the phosphor 38 is disposed on the glass substrate 11 on the display surface H side.

A pair of display electrodes 130, 1 for surface discharge
40 is provided on the glass substrate 21 on the back side, and the address electrode 22 is also provided on the dielectric layer 17 covering the display electrodes 130 and 140.

In the PDP 2, the inner surface of the glass substrate 11 is uniformly covered with the light shielding layer 40. However, the light-shielding layer 40 is provided with one light-transmitting window 40W having a predetermined area for each unit light-emitting region EU.
Is provided on the glass substrate 11 in the light transmitting window 40W so as to overlap the light shielding layer 40 around the light transmitting window 40W.

Therefore, even if the area of the formation region of the phosphor 38 varies, the light emission area on the display surface H is equal to the area of the light-transmitting window 40W, so that the display brightness is reduced in each unit light emission region. It is uniform between EUs.

In the above embodiment, the light transmitting window 15W,
The shape of 40 W and the number in the unit light emitting area EU can be appropriately changed according to the arrangement of the address electrodes 22 and the like.

[0032]

According to the present invention, the luminous area on the display surface can be made uniform among the unit luminous regions without increasing the number of manufacturing steps, and the luminance and color of the display vary. Can be eliminated.

According to the second aspect of the present invention, it is possible to eliminate variations in display brightness and display color without increasing the number of manufacturing steps.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a structure of a main part of the PDP of FIG.

FIG. 3 is an exploded perspective view illustrating a structure of a PDP according to another embodiment of the present invention.

[Explanation of symbols]

 1, 2 PDP 11, 21 Glass substrate (substrate) 13, 14 Transparent electrode 38 Phosphor 15 Metal electrode layer (light shielding layer) 15 W light transmitting window 40 light shielding layer 40 W light transmitting window EU unit light emitting area H display surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 11/02 H01J 11/00

Claims (1)

(57) [Claims] 1. A has a pair of transparent electrodes on a base plate on the display surface side, Oite the plasma display panel of a matrix display type having a phosphor on a rear side of the base plate, the unit light area PDP shielding layer made of a metal film having a light transmitting window of a predetermined area, characterized by comprising provided superimposed on each of the respective transparent electrodes each.