JPH08227664A - Plasma display panel - Google Patents

Abstract

PURPOSE: To enhance the reliability of a plasma display panel and improve luminous efficiency by forming a light absorbing section on the display side of a metal electrode layer and a light reflecting section on the reverse side thereof. CONSTITUTION: A plasma display panel(PDP) has a bus electrode 15 formed out of two metal films of Cr and Al. In this case, Cr and Al are sequentially sputtered or deposited, and patterned by use of the photolithography method to form the films. Regarding this PDP, the surface of a Cr layer acting as the display side of the electrode 15 has a small reflection factor, due to interference with a transparent electrode, and has a black color. Thus, the reflection of external light is prevented and contrast can be improved. On the other hand, the surface of an Al layer on the rear glass substrate 9 of the electrode 15 has a large reflection factor and mirror surface. Thus, regarding light emitted from a phosphor 11, light travelling to the electrode 15 is reflected on the surface of the Al layer, and can be used as display light.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and is particularly characterized by the structure of electrodes on a substrate on the display surface side.

[0003]

[0002]

[0004]

2. Description of the Related Art A color plasma display panel is
There is no need to provide an active element like a TFT type liquid crystal display element, it is a self-luminous type and has a wide viewing angle and a high-speed response, so that the display quality is good. By adopting the AC drive type surface discharge method, high brightness and long life can be realized, and it is a display element that is expected to be a display panel device following CRT and liquid crystal.

The internal structure of the plasma display panel, which is one of the display elements, will be described below with reference to FIG. 3 by taking the AC drive type surface discharge method as an example.

FIG. 3 is a sectional view of a part of an AC-driven surface discharge type plasma display panel (hereinafter referred to as PDP).

[0007]

In the front glass portion 13 on the display surface side, a transparent electrode 2 made of a transparent conductive film is provided on the front glass substrate 1.
a, 2b and bus electrodes 3, 3 made of a metal film having a narrow width to supplement the conductivity of the transparent conductive film, sustain electrode pairs 4, 4 are formed, and further, the sustain electrode pairs 4, 4 are formed. Is provided with a dielectric layer 6 and a MgO layer 7.
The bus electrode 3 is composed of a thin film electrode having a three-layer structure of chromium-copper-chromium. This chrome layer has a low reflectance,
The surface thereof is a light absorbing portion (black), which prevents external light from being reflected on the display surface of the PDP and improves the contrast of the screen.

On the other hand, the rear glass portion 14 facing the front glass portion 13 is constructed as follows. That is, in the rear glass part 14, the address electrodes 10 are provided on the rear glass substrate 9, and the phosphors 11 are formed on the respective address electrodes. Further, partition walls (ribs) (not shown) are provided between the address electrodes for the purpose of forming a discharge space while keeping the distance between the front glass substrate 1 and the rear glass substrate 9 constant.

[0009]

[0004]

[0010]

When the screen of the PDP is enlarged, the electrode length becomes long, the line impedance of the transparent electrode increases, and the narrow bus electrode 3 easily breaks. . Therefore, it is conceivable to increase the width of the bus electrode. However, if the width of the bus electrode 3 is increased, the area of the opening 8 is reduced and the light from the light emitting layer 11 is blocked and absorbed by the bus electrode 3. However, there is a problem in that the light emission efficiency is lowered due to a large proportion of the light emission.

The present invention has been made in view of the above problems, and an object thereof is to enhance the reliability of PDP and improve the luminous efficiency.

[0012]

[0005]

[0013]

According to a first aspect of the present invention, there is provided a PDP having an electrode composed of a transparent electrode layer and a metal electrode layer on an inner surface of a display surface side of a pair of substrates which are opposed to each other with a discharge space interposed therebetween. A light absorbing portion is provided on the display surface side of the metal electrode layer and a light reflecting portion is provided on the back surface side of the metal electrode layer.

[0014]

[0006]

[0015]

In the bus electrode used on the front glass substrate used for the PDP, the light absorbing portion is provided on the display surface side and the light reflecting portion is provided on the back surface side. Therefore, the reflected light is absorbed on the display surface side. The contrast of the screen is maintained and the light from the phosphor is reflected on the back side without being absorbed by the bus electrode and is emitted from the opening, so that the light from the phosphor layer is not wasted. It is used for display and can improve the luminous efficiency.

[0016]

[0007]

[0017]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of the inside of a PDP according to the present invention, and FIG. 2 is a perspective view. The same parts as those in the conventional example are designated by the same reference numerals.

[0018]

The PDP is a front glass substrate 1 on the display surface side of a pair of substrates 1 and 9 arranged to face each other with a discharge space 30 in between.
A pair of sustain electrodes 16 and 16 formed of transparent electrodes 2a and 2b made of a transparent conductive film on the inner surface of the electrode and a bus electrode 15 made of a metal film for compensating the conductivity of the transparent conductive film, and a dielectric covering the sustain electrode 16. M covering the body layer 6 and the dielectric film
The gO layer 7 is formed, and the address electrodes 10, red (R), green (G), and blue (B) are arranged on the rear glass substrate 9 on the rear side in a direction intersecting with the sustain electrode pairs 16, 16. A phosphor 11 of three primary colors and a band-shaped partition wall (rib) 12 that partitions the discharge space 30 are provided. The discharge space 30 is filled with a discharge gas in which neon is mixed with xenon.

[0019]

In the PDP of this embodiment, the bus electrode 15
Is composed of a two-layer metal film of chromium (Cr) / aluminum (Al), and is formed, for example, by sequentially sputtering or vapor depositing chromium and aluminum and patterning them by using a photolithography method.

In the PDP constructed as described above, the surface of the bus electrode 15 on the display surface side (the surface of the chrome layer) has a low reflectance due to the interference with the transparent electrode and becomes a black surface (light absorbing portion). Since the reflection of extraneous light can be prevented and the contrast can be improved, and the surface of the bus electrode 15 on the rear glass substrate 9 side (the surface of the aluminum layer) has a high reflectance and becomes a mirror surface (light reflecting portion), Of the light emitted from the phosphor 11, the light that goes toward the bus electrode 15 is reflected by the surface of the aluminum layer and becomes available as display light.

Here, the ribs 12 are formed by printing and firing a glass paste containing a white pigment so as to be light-reflecting, and the address electrodes 10 are formed of a wide aluminum thin film to serve as a light-reflecting member. The light reflected by the back surface of 15 (the surface of the aluminum layer) can be more effectively used as the display light directed to the opening 8.

[0022]

In the above-mentioned embodiment, a nickel (Ni) layer may be used for the bus electrode instead of the chromium layer, or silver (Ag) and A may be used instead of aluminum (Al).
The same effect can be obtained even if it is based on the 1-alloy or Ag alloy.

Further, in the above-mentioned embodiment, the example in which the phosphor is applied to the PDP called the reflection type provided on the rear glass substrate has been explained, but the transmission type having the phosphor on the glass substrate on the display surface side is explained. The same applies to the PDP or DC drive type PDP.

[0024]

[0011]

[0025]

The present invention has a light absorbing portion on the display surface side and a light reflecting portion on the back surface side of the bus electrode arranged on the front glass substrate, thereby preventing the reflection of external light and at the same time the phosphor. The light from is reflected on the back surface of the bus electrode and efficiently emitted from the opening. As a result, the luminous efficiency of the PDP can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the inside of a PDP according to the present invention.

FIG. 2 is an exploded perspective view of a part of an AC-driven surface discharge PDP.

FIG. 3 is a cross-sectional view of a conventional example.

[Explanation of symbols]

 1 ... Front glass substrate 2a, 2b ... Transparent electrode 3, 15 ... Bus electrode 4, 16 ... Sustain electrode 6 ... Dielectric layer 7 ... MgO layer 8: Opening 9: Rear glass substrate 10: Address electrode 11: Phosphor 12: Rib

Claims (1)

[Claims] 1. A plasma display panel having an electrode composed of a transparent electrode layer and a metal electrode layer on an inner surface of a substrate on a display surface side of a pair of substrates arranged to face each other with a discharge space interposed therebetween, the metal electrode layer comprising: A plasma display panel comprising a light absorbing portion on the display surface side and a light reflecting portion on the back surface side.