JPH05205643A - Plasma display panel - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a plasma display panel for full-color display, and an object thereof is to prolong the life by suppressing deterioration of the discharge surface due to ion bombardment. [Purpose] A plasma display panel 1 having three types of phosphors 28R, 28G, 28B having different emission colors R, G, B and capable of full-color display. As a discharge gas that emits ultraviolet rays to excite 28B, a mixed gas containing gas molecules having a larger molecular weight than helium molecules as a main component is sealed in the discharge space 30, and on the display surface H side with respect to the discharge space 30,
Optical filter 6 that absorbs unnecessary visible light emitted by the mixed gas
0 is provided and configured.

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 full color display.

Compared with a liquid crystal panel, a PDP is capable of high-speed display and can easily realize a large screen, so that it is expected to become the mainstream of large flat type display means of 20 inches or more. There is. Moreover, progress in the field of high-definition television is also promising. Therefore, there is a demand for urgent commercialization of full-color display by PDP.

[0003]

2. Description of the Related Art Conventionally, a matrix display type PDP
Among them, an AC drive type surface discharge 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 PDP having a three-electrode structure is
It has a plurality of electrode pairs formed of a pair of display electrodes arranged adjacent to each other in parallel on one substrate, and a plurality of address electrodes arranged so as to be orthogonal to each electrode pair.

In order to avoid ion bombardment due to discharge, the phosphor is provided on the other substrate so as to face the electrode pair through the discharge space, and is excited by the ultraviolet rays generated by the surface discharge between the display electrodes. It emits light.

Now, in the case of full-color display,
Normally, one dot is associated with three unit light emitting areas, and so-called 3 of R (red), G (green), and B (blue).
One primary color phosphor is provided for each unit light emitting region.
The discharge space is filled with a discharge gas that emits a large amount of ultraviolet rays.

In the conventional PDP, a Penning gas in which helium (He) as a main component is mixed with xenon (Xe) as a component that emits ultraviolet rays is enclosed as a discharge gas.

[0008]

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

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

In view of the above problems, it is an object of the present invention to prolong the life of a PDP for full color display.

[0011]

[Means for Solving the Problems] P according to the invention of claim 1
In order to solve the above-mentioned problems, the DP has three types of phosphors 28 having different emission colors R, G, B as shown in FIG.
A plasma display panel 1 having R, 28G, and 28B and configured to be capable of full-color display, in a discharge space 30 as discharge gas that emits ultraviolet rays for exciting the phosphors 28R, 28G, and 28B. A mixed gas containing gas molecules having a molecular weight larger than that of helium molecules as a main component is enclosed, and an optical filter 60 for absorbing unnecessary visible light emitted from the mixed gas is provided on the display surface H side with respect to the discharge space 30. It becomes.

In the PDP according to the second aspect of the present invention, the optical filter 60 includes the phosphors 28 in the display surface H.
The display colors of the areas corresponding to R, 28G, and 28B are configured to be substantially the same as the respective emission colors R, G, and B, respectively.

In the PDP according to the invention of claim 3, the discharge space 30 is filled with a mixed gas containing neon as a main component, and the display surface H side with respect to the discharge space 30 absorbs unnecessary visible light emitted by the neon. The optical filter 60 is provided.

In the PDP according to the fourth aspect of the present invention, the optical filter 60 includes the phosphors 28 in the display surface H.
The light-transmitting layer 60 provided by selecting the spectral characteristics for each region so that the display colors of the regions corresponding to R, 28G, and 28B are substantially equal to the emission colors R, G, and B, respectively.
It consists of R, 60G and 60B.

The PDP according to the fifth aspect of the present invention is a PDP in which a two-component Penning gas consisting of neon and xenon is enclosed as a discharge gas.

[0016]

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

On the other hand, the optical filter 60 including the light transmitting layers 60R, 60G and 60B absorbs unnecessary visible light emitted by the mixed gas and reduces the influence of the visible light on the display color as much as possible. That is, each of the phosphors 28R, 28 in the display surface HG
The light in the predetermined wavelength range is absorbed so that the display colors of the regions corresponding to G and 28B become substantially equal to the respective emission colors R, G and B.

[0018]

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, the PDP 1 is a surface discharge type PDP having an AC drive type three-electrode structure, and includes a glass substrate 11 on the display surface H side and a pair of display electrodes 13 extending in the X (horizontal) direction. , 14, an electrode pair 12, an optical filter 60 including colored dielectric layers 60R, 60G, and 60B having spectral characteristics described later, a plurality of partition walls 19 extending in the Y (vertical) direction, a glass substrate 21 on the back side, A plurality of barrier ribs 2 that define the gap size of the discharge space 30 by contact with each barrier rib 19
9, address electrodes 22 provided between the partitions 29, and phosphors 28 of three primary colors of R (red), G (green), and B (blue)
R, 28G, 28B (the alphabets of reference numerals correspond to the emission colors) and the like.

The display electrodes 13 and 14 are made up of phosphors 28R and 2R.
Since it is arranged on the display surface H side with respect to 8G and 28B, it is a transparent electrode made of a Nesa film (tin oxide film), and the back side of each of these has a narrow bus electrode (for narrowing the conductivity). For example, a thin film with a three-layer structure of chromium-copper-chromium)
Fifteen are stacked. In addition, each colored dielectric layer 60R,
60G and 60B are several thousand Å not shown together with the partition wall 19.
It is covered with a protective film made of a MgO film having a certain thickness.

The phosphors 28R, 28G, 28B are provided in order of R, G, B from the left side to the right side in the X direction so as to fill the spaces between the partition walls 29. The phosphor 28R having an emission color of R is made 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 made of O ₄ : Mn and emitting light of B is made of, for example, BaMgAl ₁₄ O ₂₃ : Eu ²⁺ . The composition of each of the phosphors 28R, 28G, and 28B is selected so that the mixed color of the three colors becomes white when simultaneously excited under the same conditions.

In the PDP 1, a selective discharge cell WC for selecting display or non-display of the unit light emitting area EU is defined at each intersection of 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
Of the phosphors 28R, 28G, and 28B that are continuous in the Y direction, it is possible to selectively emit light in a portion corresponding to each unit light emitting region EU. However, when driving the PDP 1, full color display is performed by appropriately combining R, G, and B, so that one dot (pixel) for display has three unit light emitting regions EU, that is, phosphors 28R, 28G of three colors.
28B is associated.

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

Since the molecular weight of the main component neon 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 relaxed as compared with the conventional case.

However, neon emits red-orange visible light with a wavelength of 600 to 700 nm, as shown in FIG. When such visible light is emitted to the display surface H, the display color becomes reddish, resulting in poor color reproducibility.
Note that 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, in order to make the emission color of each unit emission region EU substantially equal to the emission color of the corresponding phosphors 28R, 28G, 28B, that is, the display color. An optical filter 60 is provided in order to optimize the above.

As described above, the optical filter 60 has the phosphors 28R, 28G, 2 facing each other through the discharge space 30.
The colored dielectric layers 60R, 60G, and 60B are colored in accordance with the emission colors R, G, and B of 8B, and are formed by adding a pigment of a predetermined color to, for example, low melting glass.

Here, the R pigment is cadmium rhe.
Interstitial crystals of cadmium sulfide and cadmium selenide
Solid solution) or molybdenum red (lead molybdate, black
(A solid solution of lead romate and lead sulfate)
For chrome green (Cr ₂O₃ ), Or Viridian
[Cr₂O (OH)_FourOr Cr_FourO₃(OH)₆〕Such
Can be used. Also, as the B pigment, ultramarine
(Sulfur-containing sodium aluminosilicate), or
Navy blue (ferrocyanide iron) or the like 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. The colored dielectric layer 60R, as shown by the solid line in the figure,
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 chain 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
0B selectively transmits light in the wavelength region corresponding to the emission colors of the phosphors 28R, 28G, and 28B. Therefore, the phosphors 28R, 28G, 28 on the display surface H are
In each unit light emitting region EU corresponding to B, the phosphors 28R,
Display colors that are 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 region EU corresponding to each color of R, G, and B, and are surrounded by a chain line connecting these points P1 to P3. The color in the area is PD
The color becomes reproducible by P1. Black dots P4 to P6 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-mentioned embodiment, since the display color is optimized by coloring the dielectric layer for AC driving, it is possible to suppress the increase in the number of manufacturing steps in providing the optical filter 60 as much as possible. You can

According to the above-mentioned embodiment, since the mixed gas containing neon as the main component is used as the discharge gas, the emission spectrum of 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 this 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 for each of R, 28G, and 28B is provided, the configuration of the spectral filter 60 is not limited to this. That is, as the spectral filter 60, for example, a light transmitting layer having uniform spectral characteristics that properly absorbs only visible light emitted by neon may be provided. An uncolored (transparent) dielectric layer may be provided for the R phosphor 28R.

Although the discharge gas containing neon as the main component is used in the above-mentioned embodiments, the object of the present invention can be achieved by using the discharge gas containing other gas molecules as the main component. 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, phosphors 28R, 28G, 28B of three primary colors whose emission spectrum of visible light is R, G, B
In the region corresponding to the R phosphor 28R on the display surface H, only the R light is transmitted, and in the region corresponding to the G phosphor 28G, only the G light is transmitted. An optical filter that transmits only the B light is provided in the region corresponding to the phosphor 28B.

Further, the fluorescent substance 28 of two colors (here, R and G tentatively) of the three primary colors of the emission spectrum of visible light is used.
When they overlap with the emission spectra of R and 28G, the region of one of the two colors corresponding to the R phosphor 28R absorbs the other G light, and the region of the two colors corresponding to the G phosphor 28G absorbs the R light. Phosphor 2 that absorbs light and is the remaining one of the three primary colors (B)
An optical filter that absorbs R and G light is provided in the region corresponding to 8B.

When the emission spectrum of visible light overlaps with the emission spectrum of the phosphor 28R of one of the three primary colors (here, R), as in the above-described embodiment, at least other emission colors are used. Two-color (G and B) phosphor 28G,
An optical filter that absorbs R light is provided in the 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 changed appropriately.

In the above embodiment, the phosphor 28R,
The PDP 1 called a reflection type in which 28G and 28B are provided on the glass substrate 21 on the back side is exemplified, but the phosphor 28
The present invention can be applied to a PDP called a transmission type in which R, 28G, and 28B are provided on the glass substrate 11 on the display surface H side. In addition, AC drive type opposite discharge PDP
The present invention can also be applied to DC discharge type opposed discharge type and surface discharge type PDPs.

[0041]

According to the present invention, it is possible to reduce the deterioration of the discharge surface due to ion bombardment and to extend the life of the display without impairing the color reproducibility of full-color display.

According to the third aspect of the invention, since the spectrum of visible light emitted by the discharge gas is local, it is possible to relatively easily ensure a predetermined color reproducibility. According to the invention of claim 5, since the discharge starting voltage is relatively low, driving can be facilitated.

[Brief description of 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.

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 forming an optical filter.

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

[Explanation of symbols]

 1 PDP R, G, B Emission color 28R, 28G, 28B Phosphor 30 Discharge space 60 Optical filter 60R, 60G, 60B Colored dielectric layer (translucent layer)

Claims (5)

[Claims] 1. A phosphor having three kinds of phosphors (28R) (28G) (28B) having different emission colors (R) (G) (B) from each other,
A plasma display panel (1) capable of full-color display, comprising: a discharge space (30) as a discharge gas that emits ultraviolet rays for exciting the phosphors (28R) (28G) (28B).
A mixed gas containing a gas molecule having a larger molecular weight than that of helium molecules as a main component is enclosed, and an optical element for absorbing unnecessary visible light emitted from the mixed gas is provided on the display surface (H) side with respect to the discharge space (30). A plasma display panel comprising a filter (60). 2. The plasma display panel (1) according to claim 1, wherein the optical filter (60) is provided on each of the phosphors (28R) (28G) (28B) in the display surface (H). The display color of the corresponding area is the respective emission color (R) (G).
A plasma display panel, which is configured to be substantially equal to (B). 3. Three kinds of phosphors (28R) (28G) (28B) having different emission colors (R) (G) (B) from each other,
A plasma display panel (1) capable of full-color display, comprising: a discharge space (30) as a discharge gas that emits ultraviolet rays for exciting the phosphors (28R) (28G) (28B).
Is filled with a mixed gas containing neon as a main component, and an optical filter (6) for absorbing unnecessary visible light emitted by the neon is provided on the display surface (H) side with respect to the discharge space (30).
0) is provided, The plasma display panel characterized by the above-mentioned. 4. The plasma display panel (1) according to claim 3, wherein the optical filter (60) is provided on each of the phosphors (28R) (28G) (28B) in the display surface (H). The display color of the corresponding area is the respective emission color (R) (G).
A light-transmitting layer (60R) (60G) (6) provided by selecting spectral characteristics for each region so as to be substantially equal to (B).
A plasma display panel characterized by comprising 0B). 5. The plasma display panel (1) according to claim 3, wherein the mixed gas is a two-component Penning gas composed of neon and xenon.