JP3121090B2 - 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) for performing full-color display.

2. Description of the Related Art PDPs are expected to become the mainstream of large-sized flat display means, especially 20 inches or more, because they can display at high speed and can easily realize a large screen as compared with liquid crystal panels. I have. Also, progress in the field of high definition television is promising. Therefore, there is a demand for the rapid commercialization of full-color display by PDP.

[0003]

2. Description of the Related Art Conventionally, matrix display type PDPs
Among them, an AC drive type surface discharge type PDP is known as a PDP having a structure suitable for displaying a specific color (including multicolor and full color) by a phosphor.

For example, a surface discharge type PDP having a three-electrode structure is:
A plurality of pairs of display electrodes are arranged on one of the substrates in parallel and adjacent to each other, and a plurality of address electrodes are arranged to be orthogonal to each pair of electrodes.

The phosphor is provided on the other substrate so as to be opposed to 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 between display electrodes. Emits light.

Now, when performing full-color display,
Normally, three unit light emitting areas are associated with one dot, and so-called three (R) (red), G (green), and B (blue)
The primary color phosphor is provided for each color in each unit light emitting region.
The discharge space is filled with a discharge gas that emits a large amount of ultraviolet light.

[0007] In a conventional PDP, a penning gas in which xenon (Xe) is mixed as a component for emitting ultraviolet rays to helium (He) as a main component is sealed as a discharge gas.

[0008]

The discharge gas containing helium as a main component emits only a small amount of visible light from the gas itself, and the color purity of the color developed by the phosphor can be directly reflected on the display color. That is, it is advantageous in color reproducibility in display.

However, a PDP using this kind of discharge gas
In this case, since the molecular weight of helium (equal to the atomic weight because it is a monoatomic molecule) is small, the motion of ion particles such as xenon is hardly suppressed. Therefore, there is a problem that the inner surface (that is, the discharge surface) on the display electrode side is significantly deteriorated by ion bombardment, and the life is short.

SUMMARY OF THE INVENTION It is an object of the present invention to extend the life and improve the color reproducibility of a full-color display.

[0011]

Means for Solving the Problems The P according to the first aspect of the present invention.
In the DP, a plurality of display electrodes forming an electrode pair for generating a surface discharge between adjacent electrodes on a substrate on a display surface side are arranged along a display line, and intersect with the display line on a substrate on a back side. A plasma display panel in which a plurality of address electrodes in three directions and three kinds of phosphors having different emission colors are arranged, wherein a strip-shaped partition partitioning a discharge space and defining a gap dimension of the discharge space is provided for each of the addresses. The phosphors are arranged between the electrodes, and between the partition walls, the phosphors are sequentially provided one by one in a strip shape, and a total of three unit light emitting regions adjacent to each other along the display line and corresponding to the phosphors are displayed. Arranged in association with one pixel, a mixed gas mainly composed of neon is sealed in the discharge space as a discharge gas that emits ultraviolet rays for exciting a phosphor, and further in the discharge space. On the display surface side, an optical filter for unnecessary light emitted by the neon is provided in a strip shape, and the optical filter is provided in a form corresponding to each of the three types of phosphors in the display surface. And a strip-shaped colored dielectric layer provided with spectral characteristics selected so as to transmit light of the emission color.

A PDP according to a second aspect of the present invention is characterized in that the discharge gas is a mixed gas containing neon as a main component and xenon in a content of 1 to 15 mol%, and the substrate on the display surface side is provided with the substrate on the back side. A colored dielectric layer that transmits light of the emission color of the phosphor but does not transmit visible light due to the neon discharge is provided so as to cover the display electrode in each of the regions corresponding to the three types of phosphors. It was done.

[0013]

[0014]

[0015]

[0016]

The ion particles moving in the discharge space during the discharge reach the discharge surface while repeatedly colliding with gas molecules which are the main components of the mixed gas. At this time, as the amount of kinetic energy lost by the ion particles due to collision with gas molecules is larger than that at the time of collision with helium molecules, ion impact on the discharge surface is reduced.

On the other hand, the transparent colored dielectric layers 60R and 60R
The optical filter 60 composed of G and 60B absorbs unnecessary visible light and infrared light emitted by the mixed gas, and reduces the influence of the unnecessary light on the display color as much as possible. That is, the display surface H
Light in a predetermined wavelength range is absorbed so that the display colors of the regions corresponding to the respective phosphors 28R, 28G, and 28B in G are substantially equal to the respective emission colors R, G, and B, respectively.

[0018]

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

In these figures, a PDP 1 is a surface discharge type PDP having a three-electrode structure of an AC drive type, and a glass substrate 11 on a display surface H side, a pair of display electrodes 13 extending in the X (lateral) direction. , 14 and a strip-shaped colored dielectric layer 60R, 60G, 60B having spectral characteristics described below.
Optical filter 60, a plurality of strip-shaped partitions 19 extending in the Y (vertical) direction, a glass substrate 21 on the back side, and each partition 1
9, a plurality of strip-shaped barrier ribs 29 for defining the gap size of the discharge space 30, the address electrodes 22 provided between the strip-shaped barrier ribs 29, and R (red), G (green), and B
(Blue) phosphors 28R, 28G, 28B of three primary colors
(The alphabet of the code corresponds to the emission color).

The display electrodes 13 and 14 are provided with phosphors 28R and 2
8G and 28B, the transparent electrodes made of a Nesa film (tin oxide film) are arranged on the display surface H side, and on the back side thereof, a narrow bus electrode (supplied with a conductive film) for supplementing the conductivity. For example, a chromium-copper-chromium three-layer thin film)
15 are superimposed. Note that each colored dielectric layer 60R,
60G and 60B are several thousand square meters (not shown) together with the partition wall 19.
It is covered with a protective film made of a MgO film having a thickness of about a certain value.

The phosphors 28R, 28G, and 28B are provided in the order of R, G, and B from left to right in the X direction so as to fill spaces between the partitions 29. The phosphor 28R having an emission color of R is composed of, for example, (Y, Gd) BO ₃ : Eu ³⁺ , and the phosphor 28G having an emission color of G is, for example, Zn ₂ Si.
The phosphor 28B of O ₄ : Mn and emitting B light is composed of, for example, BaMgAl ₁₄ O ₂₃ : Eu ²⁺ . The composition of the phosphors 28R, 28G, and 28B is selected such that the three colors become white when excited simultaneously under the same conditions.

In the PDP 1, a selected discharge cell WC for selecting display or non-display of the unit light emitting region EU is defined at each intersection between one display electrode 13 of the electrode pair 12 and the address electrode 22. A main discharge cell SC for surface discharge is defined near the discharge cell WC. This allows
Each of the strip-shaped phosphors 28R, 28G, 28 continuous in the Y direction
Of B, it is possible to selectively emit light at a portion corresponding to each unit light emitting region EU. However, when driving the PDP 1, in order to perform full color display by appropriately combining R, G, and B, one dot (pixel) of display has three unit light emitting regions EU, that is, three color phosphors 28R, 28.
G and 28B are associated with each other.

In the PDP 1 of this embodiment, a two-component penning gas composed of neon and xenon (about 1 to 15 mol%) is sealed in the discharge space 30 at a predetermined pressure as a discharge gas for generating ultraviolet rays. ing.

Thus, since the molecular weight of neon as a main component is larger than that of helium, the movement of ion particles in the discharge space 30 is suppressed, and the ion bombardment of the discharge surface is reduced as compared with the conventional case.

However, as shown in FIG. 3, neon emits red-orange visible light having a wavelength of about 580 to 800 nm. When such visible light is emitted to the display surface H, the display color becomes reddish and the color reproducibility deteriorates.
FIG. 3 is a diagram showing an emission spectrum of a mixed gas of neon and xenon (5 mol%) sealed at a pressure of 500 [Torr], that is, a relationship between wavelength and emission intensity.

Therefore, in the PDP 1, on the display surface H side with respect to the discharge space 30, the emission color of each unit emission region EU is made substantially equal to the emission color of the corresponding phosphors 28R, 28G, 28B, that is, the display color The optical filter 60 is provided in order to optimize the value.

As described above, the optical filter 60 includes the phosphors 28R, 28G, and 2 facing each other via the discharge space 30.
It comprises colored dielectric layers 60R, 60G, and 60B colored according to the emission colors R, G, and B of 8B, and is formed, for example, by adding a pigment of a predetermined color to low-melting glass.

Here, the pigment of R is cadmium
(Between cadmium sulfide and cadmium selenide crystals)
Solid solution) or molybdenum red (lead molybdate,
Using a solid solution of lead romate and lead sulfate) as a G pigment
Chrome green (Cr _TwoO_Three ) Or viridian
[Cr_TwoO (OH)_FourOr Cr_FourO_Three(OH)₆〕Such
Can be used. Also, as the pigment of B, ultramarine blue
(Sulfur-containing sodium aluminosilicate), or
Navy blue (ferrocyanide) can be used.

FIG. 4 is a diagram showing the spectral characteristics of the colored dielectric layers 60R, 60G and 60B constituting the optical filter 60. As shown by a solid line in the figure, the colored dielectric layer 60R
Absorbs light other than light in the wavelength range corresponding to R. The colored dielectric layer 60G absorbs light other than light in the wavelength range corresponding to G, as indicated by the dashed line. The colored dielectric layer 60B absorbs light other than light in the wavelength range corresponding to B, as indicated by the broken line.

That is, the colored dielectric layers 60R, 60G, 6
OB selectively transmits light in a wavelength region corresponding to the emission color of each of the phosphors 28R, 28G, and 28B. Therefore, the phosphors 28R, 28G, 28 on the display surface H
In each unit emission region EU corresponding to B, the phosphors 28R,
Display colors almost the same as the emission colors of 28G and 28B appear.

FIG. 5 is a chromaticity diagram [CIE (International Commission on Illumination) -1931-chromaticity diagram] showing the chromaticity of each unit light emitting region EU of the PDP 1 according to the present invention. In FIG. 5, three white circle points P1 to P3 indicate the chromaticity of the unit light emitting area EU corresponding to each of the colors R, G, and B, and are surrounded by a chain line connecting these points P1 to P3. The color in the area is PD
Reproducible color is obtained by P1. The dots P4 to P6 of the black circles in the figure indicate the chromaticity of each unit light emitting area EU when the optical filter 60 is not provided.

According to the above-described embodiment, since the display color is optimized by coloring the dielectric layer for AC driving, an increase in the number of manufacturing steps in providing the optical filter 60 is minimized. Can be.

According to the above embodiment, since the mixed gas mainly composed of neon is used as the discharge gas, the emission spectrum of the visible light emitted by the discharge gas itself is concentrated in a relatively narrow wavelength range. The optical filter 60 having the spectral characteristic of absorbing visible light can be formed relatively easily.

In the above embodiment, each phosphor 28
Although the spectral filter 60 including the colored dielectric layers 60R, 60G, and 60B having different spectral characteristics is provided for each of R, 28G, and 28B, the configuration of the spectral filter 60 is not limited thereto. That is, as the spectral filter 60, for example, a light-transmitting layer having uniform spectral characteristics that appropriately absorbs only visible light emitted by neon may be provided. Further, an uncolored (transparent) dielectric layer may be provided for the R phosphor 28R.

In the above-described embodiment, the discharge gas mainly composed of neon is used. However, the object of the present invention can be achieved by using a discharge gas mainly composed of other gas molecules. In that case, the configuration of the optical filter 60 is appropriately selected according to the emission spectrum of visible light emitted by the discharge gas.

That is, for example, the phosphors 28R, 28G, 28B of three primary colors of R, G, and B having a visible light emission spectrum.
When the light emission spectrum overlaps with the light emission spectrum of R, only the light of R is transmitted in the area corresponding to the phosphor 28R of R on the display surface H, and only the light of G is transmitted in the area corresponding to the phosphor 28G of G, and In an area corresponding to the phosphor 28B, an optical filter that transmits only the B light is provided.

Further, the phosphors 28 of which the emission spectrum of visible light is two of the three primary colors (here, R and G are assumed).
When the emission spectrum of R and 28G overlap, the region corresponding to the phosphor 28R of one R of the two colors absorbs the light of the other G, and the region corresponding to the phosphor 28G of G absorbs the light of R. The phosphor 2 which absorbs light and has the remaining one of the three primary colors (B)
An optical filter that absorbs R and G light is provided in a region corresponding to 8B.

When the emission spectrum of the visible light overlaps with the emission spectrum of the phosphor 28R of one of the three primary colors (here, supposed to be R) as in the above-described embodiment, at least the other emission spectrum is obtained. Phosphor 28G of two colors (G and B),
An optical filter that absorbs R light is provided in a region corresponding to 28B.

Such an optical filter may be disposed on the display surface H side with respect to the discharge space 30, and may be provided on either the inner surface or the outer surface of the glass substrate 11. Also,
The material and the planar shape can be appropriately changed.

[0040]

[0041]

According to the present invention, the color reproducibility of full-color display can be improved even when a discharge gas suitable for extending the life is used.

According to the third aspect of the present invention, since the spectrum of the visible light emitted from the discharge gas is local, it is possible to relatively easily secure a predetermined color reproducibility. According to the fifth aspect of the present invention, since the discharge starting voltage is relatively low, driving can be facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a cross-sectional structure of a main part of a PDP according to the present invention.

FIG. 2 is a partial plan view of the PDP of FIG. 1;

FIG. 3 is a graph showing an emission spectrum of a penning gas composed of neon and xenon.

FIG. 4 is a diagram showing spectral characteristics of a colored dielectric layer constituting an optical filter.

FIG. 5 is a chromaticity diagram showing chromaticity of each unit light emitting region of the PDP according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 PDP R, G, B Emission color 28R, 28G, 28B Phosphor 30 Discharge space 60 Optical filter 60R, 60G, 60B Colored dielectric layer (light transmitting layer)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-134401 (JP, A) JP-A-3-269933 (JP, A) JP-A-59-36280 (JP, A) JP-A-3- 29239 (JP, A) JP-A-61-24126 (JP, A) JP-A-3-88237 (JP, A) JP-A-3-78937 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) H01J 11/00-11/02 G02B 5/20

Claims (2)

(57) [Claims] A plurality of display electrodes a table constituting the electrode pair for generating a surface discharge between 1. A adjacent to the substrate on the display surface side electrode
Are arranged along the shown lines, the display La on the rear side of the substrate
A plasma display panel on which a plurality of address electrodes in a direction intersecting the inside and three kinds of phosphors having different emission colors are arranged, wherein a strip-shaped partition partitioning a discharge space and defining a gap dimension of the discharge space. There is disposed between the respective address electrodes, the said phosphor between each partition wall is provided in a band shape in this order one by one, a total of three corresponding to the adjacent and the respective phosphors along Table 示Ra Inn A unit light emitting region is disposed in association with one pixel of the display, and emits ultraviolet light for exciting a phosphor in the discharge space.
As a discharge gas, a mixed gas mainly composed of neon is enclosed
The display surface side with respect to the discharge space.
An optical filter for unnecessary light emitted by ON is provided in a strip shape.
And the optical filter is provided in the display surface.
For each region corresponding to each kind of phosphor,
Spectral characteristics are selected and provided so that light of the emission color is transmitted.
A plasma display panel comprising a strip-shaped colored dielectric layer . 2. A surface discharge between adjacent electrodes on a substrate on a display surface side.
A plurality of display electrodes forming an electrode pair for generating
The display electrode is disposed on the substrate on the back side through the discharge space.
Address electrodes in the direction that intersects with each other and colors emitted from each other
Are arranged to excite the phosphors.
A discharge gas that emits ultraviolet light is sealed in the discharge space.
The A plasma display panel, the discharge gas is xenon as a main component neon 1-1
5% by mole, and the substrate on the display surface side has three kinds of gas on the substrate on the back side.
Light emission of the phosphor for each area corresponding to each of the phosphors
Color light is transmitted, but visible light due to the neon discharge is transmitted.
A colored dielectric layer is provided to cover the display electrode.
A plasma display panel characterized by being obtained .