JP3647498B2 - Plasma display panel - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a plasma display panel, and particularly has a feature in the structure of an electrode of a substrate on the display surface side.
[0002]
[Prior art]
Color plasma display panels do not require active elements like TFT liquid crystal display elements, are self-luminous, have a wide viewing angle, high-speed response, good display quality, and a large manufacturing process that simplifies the manufacturing process. It is a display element that is highly expected as a display panel device following CRT and liquid crystal, because it is possible to increase brightness and extend the life by adopting an AC-driven surface discharge method.
[0003]
The internal structure of a plasma display panel, which is one of the display elements, will be described below with reference to FIG. 3 by taking an AC driven surface discharge method as an example.
[0004]
FIG. 3 is a partial cross-sectional view of an AC-driven surface discharge type plasma display panel (hereinafter referred to as PDP).
[0005]
In the front glass portion 13 on the display surface side, on the front glass substrate 1, there are formed transparent electrodes 2a and 2b made of a transparent conductive film and bus electrodes 3 and 3 made of a narrow metal film to supplement the conductivity of the transparent conductive film. A sustain electrode pair 4 and 4 are formed, and a dielectric layer 6 and an MgO layer 7 are provided on the sustain electrode pair 4 and 4. The bus electrode 3 is constituted by a thin film electrode having a three-layer structure of chromium-copper-chromium. This chrome layer has a low reflectivity, and its surface is a light absorbing portion (black), preventing reflection of extraneous light on the display surface of the PDP and improving the contrast of the screen.
[0006]
On the other hand, the back glass part 14 facing the front glass part 13 is configured as follows. That is, in the rear glass portion 14, the address electrode 10 is provided on the rear glass substrate 9, and the phosphor 11 is formed on each address electrode. Further, for the purpose of maintaining a constant distance between the front glass substrate 1 and the rear glass substrate 9 and forming a discharge space, ribs (not shown) are provided between the address electrodes.
[0007]
[Problems to be solved by the invention]
Now, when the screen of the PDP is enlarged, the electrode length becomes longer, the line impedance of the transparent electrode increases, and problems such as the narrow bus electrode 3 being easily disconnected occur. 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 light from the light emitter layer 11 is blocked and absorbed by the bus electrode 3. This causes a problem that the rate of light emission increases and the light emission efficiency decreases.
[0008]
The present invention has been made paying attention to the above-described problem, and aims to improve the light emission efficiency by increasing the reliability of the PDP.
[0009]
[Means for Solving the Problems]
The invention of claim 1 has an electrode composed of a transparent electrode layer and a metal electrode layer on the inner surface of the front substrate, and has a phosphor layer on the inner surface of the rear substrate disposed opposite to the front substrate via the discharge space. In the plasma display panel in which the partition wall for partitioning the discharge space is provided on the inner surface of the rear substrate , the light absorbing portion is provided on the display surface side of the metal electrode layer and the light reflecting portion is provided on the rear portion of the metal electrode layer. It is characterized by being installed so as not to block light from the phosphor layer guided to the reflection portion.
[0010]
[Action]
In the bus electrode arranged on the front glass substrate used for the PDP, the light absorption part is provided on the display surface side and the light reflection part is provided on the back side. Since the light from the phosphor is reflected by the bus electrode without being absorbed by the bus electrode and is emitted from the opening on the back side, the light from the phosphor layer is used for display without waste. Thus, the luminous efficiency can be improved.
[0011]
【Example】
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 in the present invention, and FIG. 2 is a perspective view. Further, the same reference numerals are given to the same parts as in the conventional example.
[0012]
The PDP has transparent electrodes 2a and 2b made of a transparent conductive film on the inner surface of the front glass substrate 1 on the display surface side of the pair of substrates 1 and 9 that are opposed to each other via the discharge space 30, and the conductivity of the transparent conductive film. A back glass substrate on the back side is formed with a sustain electrode pair 16 and 16 composed of a bus electrode 15 made of a metal film for supplementing, a dielectric layer 6 covering the sustain electrode 16, and an MgO layer 7 covering the dielectric film. 9 divides address electrodes 10 arranged in a direction crossing the sustain electrode pairs 16 and 16, phosphors 11 of three primary colors of red (R), green (G), and blue (B), and a discharge space 30. A strip-shaped partition wall (rib) 12 is provided. The discharge space 30 is filled with a discharge gas in which xenon is mixed with neon.
[0013]
In the PDP of this embodiment, the bus electrode 15 is made of a two-layer metal film of chromium (Cr) / aluminum (Al). For example, chromium or aluminum is sequentially sputtered or vapor-deposited and patterned using a photolithography method. Is formed.
[0014]
In the PDP configured as described above, the surface on the display surface side (the surface of the chromium layer) of the bus electrode 15 has a low reflectance due to interference with the transparent electrode and becomes a black surface (light absorbing portion). The surface of the bus electrode 15 on the rear glass substrate 9 side (the surface of the aluminum layer) has a high reflectivity and becomes a mirror surface (light reflecting portion). Of the light emitted at, light directed to the bus electrode 15 is reflected by the surface of the aluminum layer and can be used as display light.
[0015]
Here, the rib 12 is formed by printing and baking a glass paste containing a white pigment to make it light-reflective, and the address electrode 10 is made of a wide aluminum thin film to form a light-reflecting member. The light reflected by (the surface of the aluminum layer) can be used more effectively as display light directed to the opening 8.
[0016]
In the above-described embodiment, a nickel (Ni) layer may be used for the bus electrode instead of the chromium layer, or silver (Ag) instead of aluminum (Al), an Al alloy, or an Ag alloy. Similar effects can be obtained.
[0017]
Further, in the above-described embodiment, an example in which the phosphor is applied to a PDP called a reflection type provided on the rear glass substrate has been described. However, a transmission type PDP having a phosphor on the glass substrate on the display surface side or The same applies to the DC drive type PDP.
[0018]
【The invention's effect】
The present invention has a light absorbing portion on the display surface side of the bus electrode disposed on the front glass substrate and a light reflecting portion on the back side, thereby preventing reflection of extraneous light and transmitting light from the phosphor to the bus. The light is reflected from the back surface of the electrode and is efficiently emitted from the opening. As a result, the light emission efficiency of the PDP can be improved.
[Brief description of the 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 type PDP.
FIG. 3 is a cross-sectional view of a conventional example.
[Explanation of symbols]
1 .... Front glass substrates 2a, 2b ... Transparent electrodes 3, 15 ... Bus electrodes 4, 16 ... Sustain electrodes 6 ... Dielectric layer 7 ... MgO layer 8... Opening 9... Rear glass substrate 10... Address electrode 11.

Claims (4)

An electrode composed of a transparent electrode layer and the metal electrode layer on the inner surface of the front substrate, a phosphor layer on the inner surface of the oppositely disposed rear substrate through the front substrate and the discharge space, the inner surface of the rear substrate In the plasma display panel provided with a partition wall for partitioning the discharge space,
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 portion of the metal electrode layer, so that the partition wall does not block light from the phosphor layer guided to the light reflecting portion. A plasma display panel that is installed in   The plasma display panel according to claim 1, wherein the barrier rib has light reflectivity.   3. The plasma display panel according to claim 1, wherein the barrier rib is formed in a strip shape in a direction intersecting with a direction in which the metal electrode layer extends. 4. The plasma display panel according to claim 1, wherein an address electrode as a light reflecting member is provided between the back substrate and the phosphor layer.

Images