JP2001325891A - DC discharge type plasma display panel - Google Patents

Abstract

(57) Abstract: The luminous efficiency of a conventional direct current discharge type plasma display panel (DC type PDP) is determined by first and second electrodes formed on the front glass substrate and the rear glass substrate on the discharge space side, respectively. Is also less than half of that of a CRT (cathode ray tube) in a DC discharge type plasma display panel comprising a plurality of discharge elements having a structure arranged diagonally to each other in a discharge space.
There were problems to be solved such as lack of luminance and increase in power consumption. A space between a front glass substrate (101) and a barrier (104) forming a discharge space together with the rear glass substrate (102) is narrower in a positive column (202) than in a negative glow (201).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC discharge type plasma display panel having improved luminous efficiency.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter referred to as P
DP) is the front glass substrate and the rear glass substrate
A rare gas or a mixed gas of a rare gas is enclosed in a discharge space enclosed by a barrier separating the glass substrates and each discharge element to generate a discharge. Is a flat-panel display device that emits visible light by exciting phosphors. PDPs are classified into two types: DC type (DC discharge type) and AC type (AC discharge type).
Classified into types. The DC PDP has a structure in which a cathode and an anode are exposed in a discharge space, and the AC PDP has a structure in which an electrode portion is covered with a dielectric protection film.

Hereinafter, a DC type PDP will be described. Examples of DC-type PDP light emitting devices include Ishii et al.
"Y ₂ O ₃ lower voltage positive column PDP by cathodic" IEICE, EID98-65, pp. As described in 51-56, a region where a negative glow occurs in a DC discharge mode (hereinafter, simply referred to as a negative glow region) and a region where a positive column occurs (hereinafter, simply referred to as a positive column region). Some use ultraviolet light emitted from both.

FIG. 11 is a perspective view showing the structure of a DC-type PDP by Ishii et al.
2 (a) to 2 (d). In FIG. 11, 100 is a discharge element, 101 is a front glass substrate, 102 is a rear glass substrate, 103 is a cathode, 104 is a barrier, 105 is an anode, 1
06 is a phosphor surface, and 110 is a priming path. 12A to 12D, FIG.
(A) is a broken line Y1-Y1 '(shown in FIG. 12 (b))
12 (b) is a sectional view of the element viewed from the front side of the panel, and FIG. 12 (c) is a sectional view taken along a line Y2-Y2 ′ (shown in FIG. 12 (b)). FIG. 12D is a sectional view of the element, and FIG.
FIG. 12 shows element cross-sectional views at positions (shown in FIG. 12B).

In the DC type PDP of Ishii et al., The cathode 103 is formed on the discharge space side of the front glass substrate 101. As a material of the cathode 103, yttrium oxide (Y ₂₎ which is a low-voltage cathode material is formed on an aluminum electrode. O ₃ ) A thin film is used. On the discharge space side of the rear glass substrate 102, partition walls 10 for separating discharge elements are provided.
4, an anode 105 and a phosphor surface 106 are formed. Although not shown in FIGS. 11 and 12, a resistor for limiting a current at the time of discharge is connected in series to each discharge element.

Normally, in the case of a discharge element utilizing only ultraviolet light emission in the negative glow region, an anode 105 is formed at the center of the element surrounded by a barrier 104, and discharge is generated at a position facing the cathode 103. However, in this example (Ishii et al.), The cathode 103 and the anode 105 are arranged in a diagonal relationship with each other in the discharge element to increase the distance between the electrodes, and the negative glow region 201 and the positive column The phosphor surface 106 formed on the inner wall surface of the discharge element is made to emit light by using both the ultraviolet light emission in the region 202 (the light emission enclosed by broken lines in FIG. 12D). I have. In FIGS. 12A to 12D, the discharge element has an opening width W: 310 μm and a height H of the barrier 104: 175 μm.
Is a rectangular parallelepiped element. As described above, by utilizing not only the ultraviolet light emission in the negative glow region but also the ultraviolet light emission from the highly efficient positive column region, the cathode 103 and the anode 105 are arranged to face each other, and the ultraviolet light emission only from the negative glow region is achieved. It is described in the above-mentioned Ishii et al. Document that higher luminance and higher efficiency can be obtained than a DC-type PDP using the PDP.

In order to display an image on a DC-type PDP having such a structure, in addition to the driving method of the pulse memory method described in the same document, Yamamoto et al. Academic report, EID99-65, p
p. There is a driving method described in 57-62. According to this method, the rear glass substrate 1 is provided at a position facing the cathode 103.
Providing the second anode 107 on the reference numeral 02 (see FIG. 13) provides stable moving image display characteristics and enables driving with reduced power consumption.

[0008]

However, even if the structure of the discharge element as described above and the drive of the element are performed, DC
The luminous efficiency of the type PDP is less than half that of a CRT (cathode ray tube), and there is a problem that the image display device has insufficient luminance and increased power consumption.

An object of the present invention is to solve the above-mentioned problems and to provide a DC PDP having higher luminance and higher efficiency than a conventional DC PDP display device.

[0010]

In order to achieve the above object, a direct current discharge type plasma display panel according to the present invention is provided.
DC discharge type plasma display panel comprising a plurality of discharge elements having a structure in which first and second electrodes respectively formed on a discharge space side of a front glass substrate and a rear glass substrate are diagonally arranged in the discharge space. Wherein the distance between the barriers forming the discharge space together with the front glass substrate and the rear glass substrate is narrower in a region where a positive column is generated than in a region where a negative glow is generated.

Further, in the DC discharge type plasma display panel according to the present invention, the rear surface glass substrate preferably faces the first electrode formed on the discharge space side of the front glass substrate. A third electrode is formed.

Further, in the DC discharge type plasma display panel according to the present invention, first and second electrodes formed respectively on the front glass substrate and the rear glass substrate on the discharge space side are diagonally arranged in the discharge space. In the direct current discharge type plasma display panel including a plurality of discharge elements having the above-described structure, the surface of the second electrode formed on the discharge space side of the rear glass substrate is formed on the rear glass substrate on which the electrode is formed. It is characterized by being significantly higher than the surface.

Further, in the DC discharge type plasma display panel according to the present invention, the rear surface glass substrate may face the first electrode formed on the discharge space side of the front glass substrate. A third electrode is formed.

Further, in the DC discharge type plasma display panel according to the present invention, first and second electrodes formed respectively on the front glass substrate and the rear glass substrate on the discharge space side are diagonally arranged in the discharge space. In the direct current discharge type plasma display panel including a plurality of discharge elements having a structure described above, the first electrode formed on the discharge space side of the front glass substrate has a recess provided in advance on the discharge space side of the front glass substrate. Characterized by being formed inside.

Further, the direct current discharge type plasma display panel of the present invention further comprises a front glass substrate facing the first electrode formed on the discharge space side of the front glass substrate. A third electrode is formed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments of the present invention with reference to the accompanying drawings. FIG.
(A) to (d) show a first embodiment of an element structure of a discharge element constituting a DC discharge type plasma display panel as a first invention of the present invention. FIG.
In FIGS. 12A to 12D, each of the components shown in FIG.
(D) (conventional technology). In the first embodiment, the barrier interval in the direction of the dashed line Y2-Y2 '(shown in FIG. 1B) is made narrower in the positive column than in the negative glow region. This can be easily understood from the sectional shape of the discharge space viewed from the front side of the panel shown in FIG. 1B, what the element structure in the first embodiment is.

With such a structure of the discharge element, the discharge path of the positive column discharge is narrowed, so that the loss of charged particles contributing to ultraviolet light emission increases at the barrier and the bottom surface of the adjacent discharge element. However, in this region where the electron density and the positive ion density of the filling gas are in equilibrium, the generation of charged particles for compensating for this increases due to ionization. Ultraviolet rays for exciting the phosphor to obtain visible light emission are generated by an exciting action of the sealing gas which occurs in proportion to ionization, so that the intensity thereof can be increased.

According to the first embodiment, the area of the phosphor screen of the element viewed from the front of the panel is as shown in FIGS.
Although it is smaller than that of the conventional discharge element shown in (d), the intensity of the generated ultraviolet light increases, so that the visible light emission intensity by the excitation of the phosphor is improved.

FIG. 2 shows the case of the first embodiment.
An example of the opening width (μm) of the positive column region of the discharge element versus the emission intensity (relative value) of the positive column region is shown. In this example, an yttrium oxide film (Y ₂ O
Using a cathode 103 on which _three films have been deposited, a total pressure of 27 kPA (200 Torr) and a mixing ratio of 9
In a device in which a mixed gas of He and Xe of 0% and 10% is sealed, the width of the opening (W) and the visible light emission intensity due to the positive column region when the opening width (W) is changed by making the interval of the barrier 104 close to each other. Shows the relationship. In this case, the height (H) of the barrier 104 is fixed so as not to affect the variable range of the opening width (W). As a result, when the opening width (W) of the positive column region becomes about half, the emission intensity of the positive column region becomes
About 1 in relative strength. The improvement is about three times. In this case, the voltage for maintaining the discharge and the visible light emission intensity in the negative glow region hardly change.

The first invention of the present invention for narrowing the distance between the barriers is the same as that of the first embodiment described above.
4 (a) to (d) and FIGS. 4 (a) to 4 (d), respectively.
The second embodiment shown in FIGS.
This is an embodiment in which the reference numeral 4 is formed in a tapered shape. FIG.
The third embodiment shown in (a) to (d) is an embodiment in which the barrier 104 is formed in a shape having a step. 3 (a) to 3 (d) and FIGS. 4 (a) to 4 (d), the same reference numerals as in FIGS. 1 (a) to 1 (d) are used for the respective components. ing. In these cases, almost the same characteristic improvement as in the first embodiment described above can be seen.

FIGS. 5A to 5D show an embodiment of the element structure of a discharge element constituting a DC discharge type plasma display panel according to the second invention of the present invention.
5 (a) to 5 (d), the same reference numerals as in FIGS. 1 (a) to 1 (d) are given to the respective components. In the second invention of the present invention shown in FIGS. 5A to 5D, the surface of the anode 105 formed on the rear glass substrate 102 is significantly higher than the surface of the rear glass substrate 102.

In other words, the second invention of the present invention shown in FIGS. 5A to 5D is such that the discharge space in the positive column region is made narrower in the height direction of the barrier 104 than in the negative glow region. is there. In this case, a step 108 is formed on the rear glass substrate 102 in the light emitting element. With this shape,
In the positive column region, the discharge space can be made narrower. Step 1
08 can be formed of a commonly used barrier material or an insulator material used for the purpose of insulating protection between electrodes when forming a panel.

FIG. 6 shows an example of the height H (μm) of the barrier in the positive column region of the discharge element versus the luminous intensity (relative value) of the positive column region in the case of the second invention of the present invention. . This example uses a cathode 103 in which an yttrium oxide film (Y ₂ O ₃ film) is deposited on a thin-film formed aluminum, and a discharge space has a total pressure of 27 kPA (200 Torr) and a mixing ratio of 90% and 10%, respectively. The figure shows the relationship between the height (H) of the barrier 104 and the visible light emission intensity due to the positive column when the height (H) of the barrier 104 is varied in an element in which a mixed gas of He and Xe is sealed. In this case, the opening width (W)
Is fixed so as not to affect the variable range of the height (H) of the barrier 104. As a result, the height (H) of the barrier 104
When is about half, the luminous intensity in the positive column region is about 1 in relative intensity. The improvement is about three times.

FIG. 7 shows a step 1 having a convex structure as shown in FIG.
08, the visible light emission of the negative glow region relative to the height (H) of the barrier 104 in the negative glow region when only the height (H) of the barrier 104 is reduced to narrow the discharge space. The relationship between the intensity (relative value) and the sustaining voltage (V) is shown. The figure shows that the height of the barrier is
A decrease in the visible light emission intensity in the negative glow region and an increase in the discharge sustaining voltage are observed. This phenomenon is described in the literature, “Discharge Handbook (Vol.1)”
It is thought to be due to the blocking glow discharge introduced in Ohmsha, published in 1998. In this case, the luminous efficiency of the light emitting element decreases. However, such a phenomenon is not observed in a configuration in which the height (H) of the barrier is sufficiently set in the negative glow region as shown in FIG. 5 as the second embodiment of the present invention.

FIGS. 8A to 8D show one embodiment of the element structure of the discharge element constituting the DC discharge type plasma display panel according to the third invention of the present invention.
8A to 8D, the same components as those in FIGS. 1A to 1D are denoted by the same reference numerals. In the third invention of the present invention shown in FIGS. 8A to 8D, the cathode 103 formed on the front glass substrate 101
It is formed in a recess provided in the front glass substrate 101 in advance.

In other words, the third invention of the present invention shown in FIGS. 8A to 8D is one in which the discharge space in the positive column region is narrower in the height direction of the barrier 104 than in the negative glow region. is there. In this case, similarly to the embodiment shown in FIG. 5 as the second invention of the present invention, it is possible to make the discharge space in the positive column region narrow by taking a sufficient negative glow region.

As a specific structure, the front glass substrate 1
A groove 109 is provided in a region including the cathode 103 of the cathode 01 and the cathode 1
03 is formed at the bottom of the formed groove 109 to increase the height of the barrier in the negative glow region. The groove 109 can be easily formed by cutting the glass surface by sandblasting or the like. The cathode 103 is formed by patterning a conductive cathode formed as a thin film by an electron beam evaporation method or a sputtering method by photoetching, and forming a thin film of a low-voltage cathode material such as yttrium oxide (Y ₂ O ₃ ). I do. When the thick film printing method is used for forming the cathode 103, the cathode material is printed after forming the groove 109, and the cathode portion is cut again by the sand blast method. With this structure, a similar effect can be obtained.

In the description of the prior art, the DC type P
In order to display an image by DP, in addition to the driving method of the pulse memory system, Yamamoto et al., “DC in Positive Column PDP”
Memory Drive, "IEICE Technical Report, EID99-65, pp. 5
7-62. According to this driving method,
As shown in FIG. 13, by providing the second anode 107 on the rear glass substrate 102 at a position facing the cathode 103, stable moving image display characteristics can be obtained and driving with reduced power consumption is possible. I explained to you. Also in the present invention, by providing the above-described second anode 107,
In addition to the unique effects of the present invention such as improvement in luminous efficiency, increase in luminance, and reduction in power consumption, the characteristics that the above-described stable moving image display characteristics can be obtained and driving with reduced power consumption can be performed. Can be pulled out.

FIGS. 9A to 9D show this second anode 10.
7 shows an embodiment of the fourth invention according to the present invention in which 7 is applied to the first invention (particularly, the discharge element shown in FIG. 1). 9A to 9D, the same components as those in FIGS. 1A to 1D are denoted by the same reference numerals.

The present invention is not limited to the above-described embodiment, but can be implemented with various modifications. For example, FIG.
2 and an anode 105 is formed on the front glass substrate 101. In this example, basically,
It is based on the first invention of the present invention (particularly, the element structure shown in FIG. 1).

[0031]

As described above, according to the present invention,
A discharge device having higher luminance, higher efficiency, and lower power consumption than a conventional discharge device can be realized, and therefore, a DC discharge type plasma display panel having high performance in these points can be realized.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of an element structure of a discharge element constituting a DC discharge type plasma display panel as a first invention of the present invention.

FIG. 2 shows an example of the opening width (μm) of the positive column region of the discharge element versus the emission intensity (relative value) of the positive column region in the case of the first embodiment.

FIG. 3 shows a second embodiment of the element structure of the discharge element constituting the DC discharge type plasma display panel as the first invention of the present invention.

FIG. 4 shows a third embodiment of the element structure of the discharge element constituting the DC discharge type plasma display panel as the first invention of the present invention.

FIG. 5 shows an embodiment of an element structure of a discharge element constituting a DC discharge type plasma display panel as a second invention of the present invention.

FIG. 6 shows an example of the height H (μm) of the barrier in the positive column region of the discharge element versus the emission intensity (relative value) of the positive column region in the case of the second invention of the present invention.

FIG. 7 is a graph showing the relationship between the height of the barrier in the negative glow region and the height of the barrier in the negative glow region when the discharge space is narrowed by reducing only the height of the barrier without forming a step having a convex structure The relationship between the visible light emission intensity (relative value) of the region and the discharge sustaining voltage (V) is shown.

FIG. 8 shows an embodiment of an element structure of a discharge element constituting a DC discharge type plasma display panel as a third invention of the present invention.

FIG. 9 shows an embodiment of the fourth invention in which the second anode is applied to the first invention of the invention.

FIG. 10 shows an example in which a cathode is formed on a rear glass substrate and an anode is formed on a front glass substrate.

FIG. 11 is a perspective view showing a structure of a conventional DC PDP.

FIG. 12 shows an element structure of a conventional discharge element.

FIG. 13 shows that by providing a second anode on a rear glass substrate at a position facing a cathode, stable moving image display characteristics can be obtained and driving with reduced power consumption can be performed. I have.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Discharge element 101 Front glass substrate 102 Rear glass substrate 103 Cathode 104 Barrier 105 Anode 106 Phosphor surface 107 Second anode 108 Step 109 Groove 110 Priming path 201 Negative glow region 202 Positive column region

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshimichi Takano 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside Japan Broadcasting Corporation Broadcasting Research Institute (72) Masahiko Seki 1-10-11 Kinuta, Setagaya-ku, Tokyo No. Japan Broadcasting Corporation Broadcasting Research Institute (72) Inventor Takao Kuriyama 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (72) Inventor Toshihiro Kato 1-10 Kinuta, Setagaya-ku, Tokyo No. 11 Japan Broadcasting Corporation Broadcasting Research Institute (72) Inventor Satoshi Ueda 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Research Institute (72) Inventor Tatsuya Takei 1 Kinuta, Setagaya-ku, Tokyo 10-10-11 Japan Broadcasting Corporation Broadcasting Research Institute F term (reference) 5C040 FA02 FA04 GB06 GB08 GB09 GB12 GC02 GF03 GF12

Claims (6)

[Claims] 1. A direct current comprising a plurality of discharge elements having a structure in which first and second electrodes respectively formed on a front glass substrate and a rear glass substrate on a discharge space side are diagonally arranged in the discharge space. In the discharge type plasma display panel, the interval between barriers forming the discharge space together with the front glass substrate and the rear glass substrate is made smaller in a region where a positive column is generated than in a region where a negative glow occurs. DC discharge type plasma display panel. 2. The direct current discharge type plasma display panel according to claim 1, wherein said rear glass substrate is directly opposed to said discharge space side of said front glass substrate and said first electrode formed on said discharge space side of said front glass substrate. And a DC discharge type plasma display panel, further comprising a third electrode. 3. A direct current comprising a plurality of discharge elements having a structure in which first and second electrodes respectively formed on the front glass substrate and the rear glass substrate on the discharge space side are diagonally arranged in the discharge space. In the discharge type plasma display panel, the second glass substrate is formed on a side of the rear glass substrate on a discharge space side.
Wherein the surface of the electrode is significantly higher than the surface of the rear glass substrate on which the electrode is formed. 4. The direct-current discharge type plasma display panel according to claim 3, wherein said rear glass substrate is directly opposed to said discharge space side of said front glass substrate and said first electrode formed on said discharge space side of said front glass substrate. And a DC discharge type plasma display panel, further comprising a third electrode. 5. A direct current comprising a plurality of discharge elements having a structure in which first and second electrodes respectively formed on a front glass substrate and a rear glass substrate on a discharge space side are diagonally arranged in the discharge space. In the discharge type plasma display panel, the first glass substrate is formed on a discharge space side of the front glass substrate.
Wherein the electrode is formed in a recess provided beforehand on the discharge space side of the front glass substrate. 6. The direct current discharge type plasma display panel according to claim 5, wherein said rear glass substrate is directly opposed to said discharge space side of said front glass substrate and said first electrode formed on said front glass substrate. And a DC discharge type plasma display panel, further comprising a third electrode.