JP5086896B2 - Plasma display panel, plasma display panel manufacturing method, and plasma display device - Google Patents

Description

  The present invention relates to a flat panel display (FPD) such as a display device (plasma display device: PDP device) including a plasma display panel (PDP), and more particularly to a cell structure and the like.

  FPDs such as PDP devices, liquid crystal displays, and organic EL display are highly competitive in terms of performance and cost. In particular, PDPs require improvements in bright room contrast (inhibition of external light reflection), further reduction in thickness and cost. Has been.

Examples of conventional techniques relating to the above-described improvement in contrast include techniques described in Japanese Patent Application Laid-Open No. 2007-272161 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2006-201577 (Patent Document 2). In these techniques, a film disposed on the front surface of the panel has a light-shielding functional layer in which a large number of light-absorbing portions that absorb light are arranged in parallel in at least a one-dimensional direction. Suppresses the brightness of the bright room.
JP 2007-272161 A JP 2006-201577 A

  There are two problems to be solved by the present invention. The first problem is improvement of bright room contrast. The second problem is improvement of front luminance. In particular, the improvement of front luminance, which is the second problem, is an important problem that leads to lower cost of the PDP, lower power consumption, and thinner display device.

  First, the improvement of the bright room contrast, which is the first problem, will be described. Since a general PDP has a structure in which a phosphor film (phosphor layer) in a cell can be directly seen from the front side by transmission, there is a problem that the bright room contrast is lowered due to reflection of outside light. In addition, the light emitted from the inside of the cell under the bright room includes internal light and reflected external light (external light reflected light), resulting in color mixture. This leads to a decrease in the color reproduction range. In particular, in the low gradation display with low luminance, this decrease in the color reproduction range becomes a serious problem.

  As one countermeasure against the above, as in the techniques of Patent Document 1 and Patent Document 2 and the like, a structure in which an optical filter having a partially light-shielding functional layer is disposed on the front surface of the panel is used to suppress external light incidence, This can improve the bright room contrast.

  However, the measures as described above have disadvantages such as a reduction in luminance, high cost, and an increase in panel thickness because a special optical filter is provided.

  Next, improvement of front luminance, which is a second problem, will be described. As described above, in future PDPs, there are various demands such as further reduction in power consumption, cost reduction, and thickness reduction. By achieving an improvement in front luminance, these requirements can be satisfied almost simultaneously. In a general PDP, light from a cell is emitted almost uniformly with respect to the entire visual field direction, and has a substantially uniform brightness over the entire panel surface. In contrast, an LCD or the like has a luminance distribution with respect to the viewing direction, and the front luminance is high. When a person watches a display such as a television, it is often viewed from the front. Considering this, it is very important to improve the front brightness. Further, improving the front luminance can also reduce the luminance other than the front, leading to low power consumption. Further, simplification of the drive circuit (reduction of the number of members) accompanying the reduction in power consumption leads to cost reduction and circuit thickness reduction (PDP thinning).

  The present invention has been made in view of the above problems, and a main object thereof is to provide a technique related to PDP, which can realize improvement of bright room contrast and improvement of front luminance.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows. In order to achieve the above object, a typical embodiment of the present invention is a PDP technique, which includes a discharge space in which a discharge gas for forming a discharge is enclosed, and a partition wall ( A plurality of cells (discharge cells) partitioned by ribs, a phosphor film (phosphor) that emits visible light when excited by ultraviolet rays generated by discharge between partition walls, and an electrode (display) for applying voltage to the cells Electrode) as at least a part of the constituent elements, and has the following configuration.

  (0) In the present embodiment, at least one set arranged symmetrically with respect to the center of gravity (center in a two-dimensional plan view) of a plurality of partitions (ribs) surrounding a cell (discharge region or light emitting region). The height of the partition walls on the two sides is different from each other.

  (1) In this embodiment, in the partition wall (rib) surrounding the cell, the upper rib (upper side) is relatively higher than the lower rib (lower side). Thereby, since the incidence of external light is blocked by the upper side portion of the cell, the incidence of external light on the phosphor in the cell is suppressed.

  (1A) For example, in a PDP having a box-type rib structure including a horizontal partition wall (horizontal rib) and a cell structure, among the four ribs surrounding the cell, the height of the upper side is set to another rib (at least the lower side). Part).

  (1B) For example, among the four sides of the rib surrounding the cell, the height of the lower side is made lower than the other ribs (at least the upper side).

  (2) In this embodiment, for example, in a PDP having a box-type rib structure and a cell structure including lateral partition walls (lateral ribs), a phosphor film surface (for example, a bottom surface) formed in the cells (between ribs) And the upper, lower, left, and right four side surfaces), the reflectance of the film on the upper side surface of the cell is relatively higher than the film on the lower side surface portion. As a result, the amount of light emitted from the upper surface side (upper side) in the cell increases, so that directivity is imparted to the light emitted from the cell.

  (2A) The above structure is based on, for example, changing the thickness of the phosphor film. For example, the upper side film is made thicker than the other film (at least the lower side film).

  (2B) The above structure is based on, for example, introducing a two-layer film into a part of the phosphor. The two layers are composed of, for example, a reflecting material (light reflecting layer) and a fluorescent film thereon. For example, the film on the upper side surface is a two-layer film, and the other film (at least the film on the lower side surface) is a single film.

  Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows. According to the present invention, it is possible to realize a bright room contrast improvement and a front luminance improvement in connection with the PDP. In particular, it is possible to improve bright room contrast by suppressing the incidence of external light to the phosphor in the cell (inhibition of reflection of external light), improving the front luminance by directing light from the inside of the cell, and improving the PDP performance.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted. For the sake of explanation, it has an x direction (horizontal direction in the screen), a y direction (vertical direction in the screen), and a z direction (panel thickness direction).

<Conventional technology>
With reference to FIGS. 10 and 11, the PDP of the prior art example as a premise will be briefly described. FIG. 10 shows a partial outline of a cross section in the longitudinal direction (y) of a conventional PDP. The arrow from the right side to the left side in the panel thickness direction (z) is the line-of-sight direction S in front of the panel. The upper side in the y direction is the upper part of the panel, and the lower side is the lower part of the panel.

  The conventional cell (screen) has the same cell structure on the entire surface. A partition (rib) 8 and a phosphor (phosphor film) 9 are formed on the second structure 12 on the back side, and a panel is configured by overlapping the first structure 11 on the front side. In the cell, the phosphor 9 is formed between the ribs 8. A side surface portion of the phosphor 9 is formed on the side surface of the rib 8, and a bottom surface portion of the phosphor 9 is formed on the substrate surface. The height hr of the rib 8 is basically constant over the entire panel surface.

  As indicated by a, outside light (interior lighting or the like) is basically incident from an obliquely upward direction of the panel. Contrast (bright room contrast) is reduced by a component that is reflected by the phosphor 9 and emitted in the z direction (line-of-sight direction S) of external light incident into the cell.

  Further, FIG. 11 shows a cross section (yz plane) of a conventional PDP cell as shown in FIG. 10 on the left side, and light emitted from the cell by external light irradiation such as a (external light reflected light) on the right side. ) Reflection luminance distribution (reflection luminance with respect to the position in the cell vertical direction (y)). This cell is in a non-lighting state, and only the light intensity of external light a (external light reflected light) reflected from the cell is measured. In this reflection luminance distribution, in region A, the reflection luminance is low due to the shadow of the partition wall 8 arranged on the upper side of the cell. In the region B, the reflection luminance gradually increases as the reflection luminance decreases due to the reflection of the fluorescent film 9 located on the bottom surface of the cell. On the other hand, in the region C, the reflected luminance rapidly increases due to the reflected light from the fluorescent film 9 formed on the partition wall 8 arranged on the lower side of the cell.

  These reflection luminances directly cause a decrease in the bright room contrast, and a sharp increase in the reflection luminance particularly in the region C is a problem. The reflection luminance increases toward the lower position in the vertical direction (y) of the cell. In particular, in the region C, the inclination of the reflection luminance changes with respect to the region B. This is because the lower partition 8 And it is estimated that the influence of the side surface portion of the phosphor 9 is large.

  Further, this external light reflected light, that is, the component of reflection of the external light emitted from the cell, becomes a main factor for narrowing the color reproduction range under the bright room due to color mixing with the internal light.

  In the front substrate (first structure 11) in FIGS. 10 and 11, the bus electrodes are shown so as to substantially overlap the tops of the ribs 8. However, in an actual panel, the structure, driving, etc. Depending on the situation, there are various locations where the bus electrodes are arranged. In particular, in the configuration and effect of the present invention, the position of the bus electrode is not limited.

  In addition, for example, by providing an optical filter 60 such as a louver film partially having a light absorption layer on the front surface of the panel, external light reflection is suppressed and measures for lowering contrast are taken.

(Embodiment 1)
The PDP 10 according to Embodiment 1 (Configuration 1A) of the present invention will be described with reference to FIG. In the first embodiment, in a PDP 10 having an exhaust path 50 and having a box-type partition wall 8 structure and a cell structure, one cell among four ribs (8A, 8B, 8C in FIG. 1) surrounding each cell. The heights of at least one pair of ribs (8A and 8B) arranged symmetrically with respect to the center of gravity (point G in FIG. 1) are different from each other. The center of gravity (G) is, for example, the center of the cell (light emitting region) in plan view on the xy plane. Specifically, the rib 8 (upper side portion 8A) located on the upper side of the cell is made higher than the other ribs 8 including the rib 8 (lower side portion 8B) located on the lower side of the cell. This cell structure is applied to the entire surface of the panel 10.

  In contrast to the rib height hr of the conventional PDP (FIG. 10), in this rib 8 structure, as shown in FIG. 1, the ribs 8 on the upper, lower, left and right sides surrounding the cell (light emitting region) 40, that is, the upper side portion (lateral rib) 8A. , Lower side (horizontal rib) 8B and left and right side (vertical rib) 8C, upper side (horizontal rib) 8A height: hra, lower side (horizontal rib) 8B height: hrb, left and right sides The height of the portion (vertical rib) 8C: hrc.

  In this structure, among the four ribs 8 surrounding the cell, the height fra of the upper rib (upper side portion 8A) is determined from the heights hrb and hrc of the other ribs 8 portions, that is, the lower side portion 8B and the left and right side portions 8C. (Hra> (hrb, hrc)). Further, the height hrc of the left and right side portions 8C is the same as the height hrb of the lower side portion 8B (hrc = hrb). Further, the height hr of the upper side portion 8A is made higher than the conventional rib height hr, and the height hrb of the lower side portion 8B is made the same as the conventional rib height hr (hr> hr = hrb). To summarize the above conditions, hr> hrb = hrc = hr.

  With this structure, external light is blocked by the upper rib 8 (upper side portion 8A) of the cell, so that external light incidence and external light reflection are suppressed. This corresponds to an increase in a region having a low reflection luminance such as the region A described with reference to FIG. 11, and the external light reflection from the cell is suppressed, that is, the panel reflectivity is suppressed, so that the bright room contrast is improved. (Improvement) effect is obtained.

  FIG. 4 shows an external light reflection luminance distribution in the cell, and FIG. 4A shows an effect obtained by changing the height of the rib 8 as in the first embodiment. For example, as shown in FIG. 4A, the reflection luminance in the region C can be reduced as compared with the distribution as shown in FIG. In this case, the reflected luminance can be reduced to approximately 70%. As a result, the bright room contrast can be improved by about 1.4 times. Furthermore, simultaneously with the reduction of the reflection luminance, the color mixture of internal light and external light is suppressed, and the color reproduction range is improved (improved). Further, internal light (that is, light emission from the phosphor 9 due to discharge inside the cell) is reflected by the phosphor 9 on the rib 8 (upper side portion 8A) on the upper side of the cell, and is emitted from the upper surface side in the cell. Since the amount of light increases, it is possible to provide the light emission directivity that light is likely to be emitted obliquely downward. In addition, as will be described in detail below, by forming such cells with different rib heights on a part or the entire surface of the panel, the luminance in the viewing direction S (FIG. 10) on the front of the panel, that is, the front luminance is improved. It becomes possible to do.

  In FIG. 1, (a) shows mainly the rib 8 and the front side plane of the cell structure of the PDP 10, (b) shows the AA ′ cross section (cell vertical cross section) of (a), ( c) shows the BB 'cross section (transverse cross section of the cell) of (a) correspondingly. a shows an example of light (external light) incident on the panel 10, and b shows an example of light (internal light) emitted from the panel 10.

  The PDP 10 has a box-type rib 8 having an exhaust path 50 and a cell structure. That is, a space that has a ladder-shaped partition wall 8 in the x direction and is surrounded on all sides by the partition wall 8 is associated with a cell (light emitting region or discharge region). The box-type rib 8 has horizontal ribs (8A, 8B) parallel to the x direction and vertical ribs 8C parallel to the y direction. The horizontal rib 8A corresponds to the upper side of the cell, the horizontal rib 8B corresponds to the lower side of the cell, and the vertical rib 8C corresponds to the left and right side of the cell. In the first structure (front substrate structure) 11, on the front substrate (glass substrate) 1, for example, above the lateral ribs (8A, 8B), display electrodes 2 (sustain electrodes (X ), A scanning electrode (Y)) is provided, and is covered with the dielectric layer 3 and the protective film 4. In the second structure (back substrate structure) 12, an address electrode 6 parallel to the y direction is provided on the back substrate (glass substrate) 5 and is covered with a dielectric layer 7. On the dielectric layer 7, ribs 8 are formed corresponding to the sections of the cell group. A phosphor 9 is formed between the ribs 8 in the form of a film (layer) having a predetermined thickness (average).

  As a first feature, in the structure of each cell, the height hr of the upper side portion 8A is higher than the height hrb of the lower side portion 8B (hr> hrb). Let the difference in height be Δh = hra-hrb. The above-described effects can be obtained by securing Δh to a predetermined size or more. It is desirable that Δh is at least 15 μm, which is greater than the height difference caused by manufacturing variations. Alternatively, Δh is desirably at least 0.1 × hr.

<Example of electrode configuration>
In order to obtain further effects in addition to the above, there are the following configuration examples. At least a part of the electrodes (bus electrodes in this example) constituting the display electrodes 2 (X, Y) arranged on the front substrate 1 side is made of an opaque material (low visible light transmission). A non-transparent electrode made of a conductive material. The height hrb of the lower side portion 8B is, for example, in the range of 0.58 times or more and 1.73 times or less the electrode width L (length in the y direction) of the opaque electrode (0.58L ≦ hrb ≦ 1. 73L: It is desirable to be in the formula (3) described later.

  In general, the display electrode is often composed of a transparent electrode such as ITO and a bus electrode such as silver or copper. The said opaque electrode means the metal electrode which consists of silver or copper, for example.

  Hereinafter, the relationship between the height hrb of the rib (8B) and the width L of the opaque electrode will be described with reference to FIG. FIG. 3 shows a cross section in the vertical direction (y) of the cell as another configuration example for producing a further effect in the first embodiment. In the drawing, only opaque electrodes (EX, EY in FIG. 3) are shown, and transparent electrodes are not shown. The display electrode 2 (X, Y) inside the first structure 11 has, for example, an opaque electrode EX constituting the sustain electrode (X) in the upper region of the cell, and the scanning electrode (Y) in the lower region. ) Forming the opaque electrode EY. Each of the opaque electrodes EX and EY is, for example, a metal electrode, and includes a linear bus electrode (connected to the drive circuit side). Alternatively, the opaque electrodes EX and EY may be formed of an overhanging portion that is connected to the bus electrode and protrudes to the inside of the cell. The opaque electrode EX is disposed, for example, at a position that slightly protrudes to the cell inner side than the position of the top of the lateral rib (upper side portion) 8A.

  As described above, in order to suppress reflection of external light from the cell, in particular, incidence on the fluorescent film 9 (side surface portion) formed on the rib (lower side portion 8B) disposed on the lower side of the cell is prevented. It is important to suppress. Therefore, as shown in FIG. 3, the fluorescent film 9 is formed near the side surface of the rib 8 (lower side portion 8B) disposed on the lower side of the cell by the opaque electrode 2 (EX, EY) such as a metal bus electrode. By suppressing the incidence of external light (a) to the portion (side surface portion 9b), it becomes possible to significantly reduce the reflected luminance from the cell. For example, since the external light a ′ is shielded by the opaque electrode (EX) on the upper side of the cell, the fluorescent light 9 (9b) formed on the rib 8 (8B) on the lower side of the cell is not irradiated. In order to form this non-irradiated region over the entire surface of the fluorescent film (9b) of the lower rib (8B), the height hrb of the lower rib (8B), the width L of the opaque electrode (EX), and the incidence of external light a The angle θ should satisfy the following formula (1).

hrb ≦ L / tan θ (1)
By satisfying the above formula (1), the external light incident on the fluorescent film (9b) surface of the cell lower rib (8B) can be shielded by the opaque electrode (metal bus electrode) (EX), and the reflection luminance is greatly increased. It becomes possible to reduce it.

  On the other hand, considering the extraction of internal light, the rib height should be as high as possible from the application area of the phosphor 9. In order to satisfy the above formula (1) and make the rib height as high as possible, it is desirable to satisfy the following formula (2).

hrb = L / tan θ (2)
In general, when viewing a PDP in an indoor environment with indoor lighting, the external light is mostly irradiated from obliquely above the PDP, and the incident angle θ is approximately It is between 30 ° and 60 ° (30 ° ≦ θ ≦ 60 °: θ condition (1)). More generally, θ is between 35 ° and 45 ° (35 ° ≦ θ ≦ 45 °: θ condition (2)).

  From these facts, for example, considering the θ condition (1), the height hrb of the lower rib (8B) is 0.58 (≈1 / tan 60 °) or more times the width L of the opaque electrode (EX). It is desirable to be in the range of 1.73 (≈1 / tan 30 °) times or less. That is, the following formula (3) is satisfied as the hrb condition (1).

0.58L ≦ hrb ≦ 1.73L (3)
Further, the width L of the opaque electrode (EX) is specifically in the range of 40 μm to 80 μm, for example, in consideration of driving conditions such as wiring resistance and design conditions (40 μm ≦ L ≦ 80 μm: L condition (1)). .

  Therefore, the height hrb of the rib (8B) is desirably in the range of 23 μm (≈0.58 × 40 μm) to 138 μm (≈1.73 × 80 μm). That is, the following condition (4) is satisfied as the hrb condition (1 ′).

23 μm ≦ hrb ≦ 138 μm (4)
Further, most generally, the aforementioned θ condition (2): 35 ° ≦ θ ≦ 45 °. At this time, the height hrb of the rib (8B) is in the range of 1.00 (= 1 / tan 45 °) times or more and 1.43 (≈1 / tan 35 °) times the width L of the opaque electrode (EX). It is desirable to be. That is, the following equation (5) is satisfied as the hrb condition (2).

1.00L ≦ hrb ≦ 1.43L (5)
Specifically, considering the L condition (1) as described above, hrb is preferably in the range of 40 μm (= 1.00 × 40 μm) to 114 μm (≈1.43 × 80 μm). That is, the following condition (6) is satisfied as the hrb condition (2 ′).

40 μm ≦ hrb ≦ 114 μm (6)
Thus, by setting the height of the rib (8B) on the lower side of the cell and the width L of the opaque electrode (metal bus electrode) (EX) as described above, the external light reflection luminance can be greatly suppressed. This corresponds to lowering the reflection luminance in the region C shown in FIG. Thereby, the reflection of external light from the cell is suppressed, that is, the panel reflectivity is suppressed, so that the bright room contrast improvement (improvement) effect is obtained.

  In this configuration, the height hrb of the lower lateral rib 8B is determined in consideration of the width L of the upper opaque electrode (EX), the external light incident angle θ, and the like. In particular, the phosphor side surface portion 9b of the lower lateral rib 8B is determined so as to be efficiently shielded by the width L of the opaque electrode.

  FIG. 4B shows the effect obtained by adding a light shielding technique using an opaque electrode (EX) as shown in FIG. 3 to the above-described (a) (when the rib height is changed). For example, as shown in FIG. 4B, compared to FIG. 11, the reflected luminance in the region C can be significantly reduced (ideally almost 0), and the reflected luminance is reduced to about 40%. Can do. This can improve the bright room contrast by about 2.5 times. Simultaneously with the reduction in reflection luminance, the color mixture of internal light and external light is suppressed, and the color reproduction range is improved (improved).

  In FIG. 1B, a film (side surface portion) of the phosphor 9 is formed on the side surface inside the cell of the upper side portion 8A and the lower side portion 8B. Further, a film (bottom surface portion) of the phosphor 9 is formed on the upper surface (the surface of the dielectric layer 7) of the second structure 12 between the upper side portion 8A and the lower side portion 8B. In the external light a, for example, light incident on the upper side 8A is blocked from entering the cell. In the internal light b, for example, light emitted from the bottom surface portion of the phosphor 9 or the side surface portion on the lower side portion 8B side and emitted in the direction of the phosphor 9 (side surface portion) of the upper side portion 8A is the phosphor 9 The light is reflected by the (side surface portion) and emitted obliquely downward with respect to the front surface of the panel. Therefore, the light emission in units of cells has directivity in this diagonally downward direction.

<Partition configuration example>
As another configuration example, as shown in FIG. 14B, the partition wall 8 structure is close to the front substrate 1 (first structure 11) as compared with the conventional (basic) cell structure as shown in FIG. By adding a structure (Awb> Awt) for reducing the cell opening portion (40) on the side, the above-described effects can be further obtained. That is, in the conventional configuration, as shown in FIG. 14 (a), the rear substrate 5 (second structure) with respect to the width Awt of the cell opening in the partition wall 8 near the front substrate 1 (first structure 11). The width Awb of the bottom on the body 12) side is equal or smaller. On the other hand, in the configuration of FIG. 14B, the width Awb is larger than the width Awt (Awb> Awt). Specifically, the upper rib (8A) and the lower rib (8B) of the cell are slightly inclined toward the inner side of the cell in the z direction. Thereby, since the incident of external light into the cell can be further suppressed, the above-described effects can be obtained. This structure can be achieved, for example, by forming the partition wall 8 obliquely with respect to the substrate (back substrate 5).

<Exhaust path>
Further, in the present configuration (FIG. 1), an exhaust path 50 (gap in the discharge space 13) extending in the x direction is provided between the ladder-like ribs 8. The exhaust path 50 is used in a known exhaust and gas filling process or the like. In addition, as shown in FIGS. 1B and 1C, in the discharge space (inter-substrate region) 13 between the first structure 11 and the second structure 12, the height of the upper side 8A on the higher side. A certain distance is secured in the z direction according to hr. Moreover, the case where an exhaust path is provided in the gap between the top surface of the horizontal rib 8A having a height hr and the front substrate (protective film 4) within the fixed distance is shown. This may be in a close contact state when the exhaust path is not provided. Further, in the lower side portion 8B having a lower height, a gap is formed between the first structure 11 (protective film 4), and the gap serves as an exhaust path in the y direction. The exhaust path is connected to the exhaust path 50 in the x direction. Therefore, by using the entire exhaust path including the upper exhaust path of the lower side portion 8B, the exhaust efficiency can be improved and the panel quality can be improved. It should be noted that the presence / absence and details of the exhaust path 50 are possible in addition to this configuration. For example, it is possible to eliminate the exhaust path 50 of FIG. 1 and form a box rib structure.

<Box rib>
FIG. 16 shows a case where the above-described box rib structure is used as another configuration example. That is, this is a case where the box-shaped partition wall 8 structure is formed by integrating the horizontal ribs (8A, 8B) having different heights in the cells adjacent in the vertical direction (y). The horizontal rib 8B having the height hrb and the horizontal rib 8A having the height hr are integrated to form a horizontal rib 8D that partitions adjacent cells.

<Various cells>
Furthermore, as a modification, various cell structures as shown in FIGS. 13A to 13D are possible. This is an example in which the shapes on the xy plane are different, and each is a partition 8 structure that satisfies the above-described conditions for the center G of the cell. (A) is a case of a rectangle. The height of the upper side portion 8A and the left and right side portions 8C is hra, and the height of only the lower side portion 8B is hrb. (B) is the case of the first hexagon. The height of the three sides on the upper half side is hr, and the height of the three sides on the lower half side is hrb. (C) is the case of the second hexagon. The height of the upper two sides is hra, and the height of the other sides is hrb. (D) is a circular case. The circumference of the upper half side is hr, and the circumference of the lower half side is hrb.

  In order to form the ribs 8 surrounding one cell at different heights as described above, for example, there are the following methods.

  First, the design and process is simply changing the mask pattern or the like in the sandblast method with the upper and lower (high and low) ribs (for example, 8A and 8B) surrounding the cell. For example, the method includes a step of forming the lower rib (8B) with a first mask pattern and a step of forming the higher rib (8A) with a second mask pattern. Alternatively, sandblasting time and strength may be changed by forming upper and lower ribs.

  Second, the material of the upper and lower ribs (for example, 8A and 8B) surrounding the cell is changed. For example, when the ribs 8 are formed by the sandblast method, rib materials having different hardnesses are used for the upper and lower ribs. As a result, the ribs having different heights are obtained because the polishing rates of the respective rib members are different between the upper and lower ribs in the same sandblasting time.

  A third method is to change the thickness (width) of the upper and lower ribs (for example, 8A and 8B) surrounding the cell. The final process for forming the rib includes a high-temperature firing process. At this time, the rib material undergoes thermal shrinkage. In a rib having a narrow width, the contraction is large and the rib height tends to be low. Conversely, a wide rib has a small shrinkage and the rib height tends to be higher than that of a narrow rib. By utilizing such a tendency, ribs having different heights can be formed. Or you may use the method of using the rib material from which a thermal contraction rate differs by an upper and lower rib. A difference in height can be obtained by different shrinkage levels between the upper and lower ribs for predetermined sandblasting and firing conditions.

(Embodiment 2)
Next, PDP 10 according to Embodiment 2 (Configuration 1B) of the present invention will be described with reference to FIG. The second embodiment has the same main features (hr> hrb) as the first embodiment. In the second embodiment, in the PDP 10 having the box-type rib 8 structure and the like similar to the first embodiment, the height of some ribs 8 in each cell is changed to be lower than the conventional one. Specifically, The rib 8 (lower side part 8B) located on the lower side of the cell is made lower than the other ribs 8 including the rib 8 (upper side part 8A) located on the upper side of the cell.

  In contrast to the rib height hr of the conventional PDP (FIG. 10), in this rib 8 structure, as shown in FIG. 2, four side ribs 8 (upper side portion (horizontal rib) 8A, lower side portion (horizontal rib)) surrounding the cell 40 are used. 8B and the left and right side portions (vertical ribs) 8C), the height rib of the lower rib (lower side portion 8B) is set to the height of the other ribs, that is, the heights of the upper side portion 8A and the left and right side portions 8C. Lower than hrc ((hra, hrc)> hrb). This is a case where the height hrc of the left and right side portions 8C is the same as the height hr of the upper side portion 8A (hrc = hr). Further, the height hrb of the lower side portion 8B is made lower than the conventional rib height hr, and the height hr of the upper side portion 8A is made equal to the conventional rib height hr (hra = hr> hrb). To summarize the above conditions, hr = hrc = hr> hrb. In each drawing, the scale difference in each embodiment with respect to the conventional rib height hr is omitted.

  As in the first embodiment, this structure suppresses the panel reflectivity, so that an effect of improving bright room contrast can be obtained and the directivity of light emission in a diagonally downward direction can be imparted.

  Further, as a modification when compared with the conventional rib height hr, the height hr of the upper side portion 8A is made higher than the conventional rib height hr, and the height hrb of the lower side portion 8B is set to the conventional rib height hr. A lower configuration (hr> hr> hrb) is also possible, and the effect can be further enhanced.

  Moreover, as a modification regarding the height hrc of the left and right side portions 8C, in addition to matching the height (hrb, hr) of the lateral ribs (8A, 8B), a configuration in which these heights are in the middle (hr> hrc) > Hrb) is also possible.

  As described above, according to the first and second embodiments, external light reflection suppression and the like can be realized, and directional light emission in a diagonally downward direction with respect to the front of the panel can be realized. As a result, the effect of improving bright room contrast and improving the luminance in the obliquely downward direction can be obtained. In addition, since the internal structure itself of the panel 10 has the functions and effects of the above optical characteristics, the necessity of providing an optical filter 60 such as a louver film on the front surface of the panel as in the prior art can be reduced. This makes it possible to reduce the thickness and cost.

(Embodiment 3)
Next, PDP 10 according to Embodiment 3 (Configuration 1C) of the present invention will be described with reference to FIG. In the third embodiment, in addition to the same configuration as in the first embodiment and the like (same in the second embodiment), the width (y-direction length) of the lateral ribs (8A, 8B) is further changed. Specifically, when the width of the upper lateral rib (upper side portion) 8A of the cell is Wra and the width of the lower lateral rib (lower side portion) 8B is Wrb, Wra> Wrb.

  With this configuration, it is possible to obtain the same operations (shielding of external light a, emission of internal light b in the diagonally downward direction on the front panel) and effects (contrast improvement, luminance improvement in the diagonally downward direction) as in the first embodiment. As an action, in particular, the amount of shielding from the incidence of external light increases depending on the size of the top surface of the lateral rib 8A. In addition, the above-mentioned effect is acquired by making the difference of said width into (DELTA) W = Wra-Wrb and ensuring (DELTA) W more than predetermined magnitude | size. It is desirable that ΔW is at least 15 μm, which is greater than or equal to a wide difference caused by manufacturing variations. Alternatively, Δw is preferably at least 0.1 × Wra.

  Similarly, it is possible to change the width (Wra, Wrb) of the rib 8 without changing the height of the rib 8. Also in this embodiment, a corresponding effect such as a contrast improvement can be obtained by the same operation as described above.

(Embodiment 4)
Next, the PDP 10 according to the fourth embodiment of the present invention will be described. In the fourth embodiment, the rib 8 is made of a black rib, that is, a low-reflective rib material in the configuration of the first embodiment. The shape is the same as in FIG. In each embodiment, the material of the rib 8 is not particularly limited. However, by adopting the present configuration, the above-described outside is comprehensively achieved due to the low reflectivity (reflection suppression (absorption, etc.) of external light a) of the black rib. The contrast improvement effect due to the effect of suppressing light reflection is increased.

  Further, not only the configuration in which the entire rib 8 is a black rib, but also only the top of the rib 8 (side closer to the first structure 11) as a low-reflective rib material (black rib) 80 as shown in FIG. A reasonable effect can be obtained. (A) is a case where, among the four sides of the rib 8, only the lower side portion 8B has a height hrb, and a layer of black ribs 80 is provided on the tops of the side portions (8A, 8C) having the other heights hr. (B) is a case where, among the four sides of the rib 8, only the upper side portion 8A has a height hra, and a layer of black ribs 80 is provided only on the top of the upper side portion 8A.

The black rib is generally constituted by mixing a black material such as Cr—Mn oxide or Fe ₂ O ₃ into a glass material mainly composed of a borosilicate glass material.

(Embodiment 5)
Next, PDP 10 according to Embodiment 5 (Configuration 2A) of the present invention will be described with reference to FIG. In Embodiment 5, the reflectance of the phosphor 9 film located on the upper surface of the cell among the film surfaces of the phosphor 9 formed in the cell (bottom surface and four side surfaces) is increased. It is a configuration. Specifically, the thickness of the fluorescent film 9 is changed in the cell, and in particular, the fluorescent film 9A positioned on the upper side surface (upper side portion 8A) is changed from the fluorescent film 9B positioned on the lower side surface (lower side portion 8B). It is the structure which makes it thick.

  In FIG. 6, the phosphor 9 in the cell has an upper fluorescent film 9A and a lower fluorescent film 9B, and the film thicknesses (roughly average) are da and db, respectively. The upper fluorescent film 9A is formed on the lower side surface of the upper side portion 8A. The lower fluorescent film 9B is formed on the upper side surface of the lower side portion 8B. As a feature, da> db.

  FIG. 12 shows the relationship between the thickness of the fluorescent film and the reflectance in connection with this configuration. In FIG. 12, a: “single-layer phosphor film” is a film composed of a single layer of phosphor only as in the fifth embodiment, and the reflectance of the phosphor film is equal to the film thickness of the phosphor film. In the film thickness range (40 μm or less) of the fluorescent film formed in the PDP cell, the reflectance tends to increase as the fluorescent film thickness increases. b: The “two-layer fluorescent film” will be described in the sixth embodiment.

  In FIG. 6, since the upper fluorescent film 9A is relatively thick, the light reflectance is high, and since the lower fluorescent film 9B is relatively thin, the light reflectance is low. For example, when external light such as a is incident on the lower fluorescent film 9B, reflection of external light is suppressed due to the low reflectance. Normally, the environment where the display is viewed is the indoor environment, and the outside light is indoor lighting arranged on the ceiling or the like. The light from the room lighting is light from diagonally above the panel as indicated by a. Further, the internal light such as b is efficiently reflected by the high reflectance of the upper fluorescent film 9A, and the amount of light emitted obliquely downward with respect to the viewing direction S on the front of the panel is increased. That is, as in the first embodiment and the like, a contrast improvement effect is obtained, and the light emission directivity in the obliquely downward direction is given, and the luminance in the direction is improved.

<Phosphor formation method>
FIG. 7 shows a method (process) for forming phosphor 9 of PDP 10 according to the fifth embodiment. In this method, the phosphor paste 90 is filled in the cells (between the ribs 8) by screen printing in the phosphor printing step on the second structure 12 side. Next, in the drying process, the shape of the phosphor film in the cell is determined at the time of drying. In the case of the drying process of the conventional method as compared with this method, the phosphor paste 90 is dried with the substrate (second structure 12) held in the horizontal direction. Thereby, the fluorescent film 9 is uniformly formed with a symmetrical thickness in the vertical direction in the y direction in the cell. On the other hand, in the drying step of the present method, the phosphor paste 90 is dried with the substrate (second structure 12) tilted. Thereby, as in the configuration of the fifth embodiment, fluorescent films 9 unevenly distributed in the cell, that is, films having different thicknesses according to the upper and lower positions in the y direction are formed.

(Embodiment 6)
Next, PDP 10 according to Embodiment 6 (Configuration 2B) of the present invention will be described with reference to FIG. The sixth embodiment is configured to increase the reflectance of the phosphor 9 (side surface portion) film located on the upper side surface (upper side portion 8A) of the phosphor 9 formed in the cell. is there. Specifically, in particular, the partial fluorescent film is a two-layer fluorescent film 9C, and the two-layer fluorescent film 9C includes a lower light reflecting layer (light reflecting material) 9E and an upper fluorescent film. Is done. The part other than the two-layer fluorescent film 9C in the cell becomes a single-layer fluorescent film 9D. The lower light reflection layer 9E is, for example, a titanium oxide layer, and the formation of the layer is unevenly distributed in the cell. The upper fluorescent film has a substantially constant thickness (dc) by the same phosphor forming method as in the prior art, and is made thinner than the fluorescent film 9 of the first embodiment, for example. The upper fluorescent film is continuous with the two-layer fluorescent film 9C and the single-layer fluorescent film 9D.

  FIG. 12 shows the relationship between the thickness of the fluorescent film and the reflectance in connection with this configuration. a: [Single-layer phosphor film] is as described above. b: The “two-layer fluorescent film” has a laminated structure of a reflective layer (film thickness: wr) (9E) and a fluorescent layer as in the sixth embodiment. B: “two-layer fluorescent film” shown in the graph of FIG. 12 is the reflectance [%] (vertical axis) when titanium oxide having wr = 11 μm is used. The horizontal axis represents the total film thickness wt [μm] including the film thickness of the reflective layer (9E). For example, even if a and b have the same thickness (total film thickness) of 20 μm, the reflectance is about 82% in a: single-layer phosphor film, whereas b: a two-layer phosphor film is used. The reflectance can be improved up to 92%. By using such a double-layer fluorescent film and a single-layer fluorescent film properly in the cell, the configuration as described above can be obtained.

  In FIG. 8, the light reflecting layer 9 </ b> E in the cell is formed over the lower side surface of the upper side portion 8 </ b> A and the upper surface of the dielectric layer 7. The upper fluorescent film is uniformly formed over the lower side surface of the upper side portion 8A, the upper surface of the dielectric layer 7, and the upper side surface of the lower side portion 8B. The light reflectance is relatively high due to the presence of the light reflecting layer (reflective film) 9E on the upper surface and the bottom surface of the cell, and the light reflectance is relatively low on the lower surface of the cell. . For example, when external light such as a is incident on the lower single fluorescent film 9D, reflection of external light is suppressed due to the low reflectance. Further, the internal light such as b is efficiently reflected by the high reflectance of the upper fluorescent film 9C, and the amount of light emitted obliquely downward with respect to the viewing direction S on the front of the panel increases. That is, as in the first embodiment and the like, a contrast improvement effect is obtained, and the light emission directivity in the obliquely downward direction is given, and the luminance in the direction is improved.

  Further, Embodiments 5 and 6 can be combined with Embodiments 1 to 4 described above.

(Embodiment 7)
Next, the PDP 10 according to the seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment, the cell structure (first structure) according to the first embodiment and the cell structure (second structure) obtained by inverting the first cell structure in accordance with the position in the screen of the panel 10. And a predetermined light emission directivity is imparted to the entire panel 10. Specifically, the first structure is applied to the upper part A of the center part B of the panel 10, and the second structure is applied to the lower part C. With this configuration, in addition to improving the bright room contrast, an effect of improving the front luminance can be obtained.

  9A shows a vertical direction (y) of a PDP apparatus configured to include a PDP 10, a driving circuit for the panel, a chassis (housing), and a video signal device for displaying an image on the panel. ) Is an example of a cross section, A is an upper portion of the panel 10 (screen), B is a central portion, and C is a lower portion. (B) shows a cell structure corresponding to each of the areas A to C of the panel 10. In the central part B, a cell structure having a light output directivity in the standard straight front direction (z) is applied. In the upper part A, the cell structure has a light emission directivity slightly downward with respect to the z direction due to a structure in which the upper side 8A of the rib 8 is higher than the lower side 8B as in the first embodiment. The first structure is applied. In the lower part C, as the cell structure, a second structure having a light emission directivity in a slightly oblique upward direction with respect to the z direction, which is obtained by vertically inverting the first structure of the upper part A, is applied.

  With such a combination of cell structures (light emission directivity), the luminance (front luminance) with respect to the line-of-sight direction S (FIG. 8) in front of the panel 10 can be improved.

  Similarly to the above, the same effects can be obtained by applying the same configuration as in the seventh embodiment to the fifth and sixth embodiments. That is, the cell structure (first structure) according to the fifth embodiment is applied to the upper part A of the panel 10, and the cell structure (second structure) obtained by inverting the first structure is applied to the lower part C. It is a configuration.

  As described above, according to each embodiment, it is possible to improve bright room contrast, impart light output directivity, improve front luminance, and the like, thereby improving PDP performance. Further, with such improved panel performance, the drive circuit can be simplified and the number of members can be reduced, leading to reductions in the PDP thickness, cost, and power consumption.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

  The present invention is applicable to a PDP device, particularly a thin PDP.

It is a figure which shows the structure of PDP of Embodiment 1 (structure 1A) of this invention, (a) is a cell structure of the front side, (b) is a longitudinal cross section, (c) shows a horizontal cross section. It is a figure which shows the structure of PDP of Embodiment 2 (structure 1B) of this invention, (a) is a cell structure of the front side, (b) is a longitudinal cross section, (c) shows a horizontal cross section. It is a figure which shows the cell cross section in another structural example for producing the further effect in Embodiment 1 of this invention, and shows the relationship between an electrode width and rib height. It is a figure which shows the external light reflection luminance distribution in a cell as a technical effect in Embodiment 1 of this invention, (a) shows the effect by changing rib height, (b) is a bus electrode ( This shows the effect when the opaque technology is applied. It is a figure which shows the structure of PDP of Embodiment 3 (structure 1C) of this invention, (a) is a cell structure of the front side, (b) shows a longitudinal direction cross section. It is a figure which shows the structure of PDP of Embodiment 5 (structure 2A) of this invention, (a) is a cell structure of the front side, (b) is a longitudinal cross section, (c) shows a horizontal cross section. It is a figure which shows the formation method of the fluorescent substance in the manufacturing method of PDP of Embodiment 5 of this invention. It is a figure which shows the structure of PDP of Embodiment 6 (structure 2B) of this invention, (a) shows the cell structure of the front side, (b) shows a longitudinal direction cross section. It is a figure which shows the structure of PDP (PDP apparatus) of Embodiment 7 of this invention, (a) is a longitudinal cross-section of a PDP apparatus, (b) shows the cell structure according to panel position (AC). . It is a figure which shows the longitudinal direction cross section of PDP of a prior art example. It is a figure which shows the longitudinal direction cross section of PDP (cell) of a prior art example, and the luminance distribution of external light reflection from a cell. It is a figure which shows the relationship between film thickness, such as a fluorescent film, and a reflectance in connection with the structure of Embodiment 5,6. (A)-(d) is a figure which shows the various cell structures in modifications, such as Embodiment 1. FIG. It is a figure which shows another structural example for taking out the further effect in Embodiment 1 of this invention, (a) is a conventional (basic) cell structure, (b) is a cell of this structural example with respect to (a). The structure is shown. It is a figure which shows another structural example for acquiring the effect similar to Embodiment 4 of this invention, (a) is a case where a black rib layer is arrange | positioned besides a lower rib, (b) is only an upper rib. The case where a black rib layer is arrange | positioned is shown. It is a figure which shows the case where horizontal ribs of the adjacent cell of a vertical direction are integrated, and it is set as a box-shaped partition structure as a modification in Embodiment 1 etc. of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Front substrate (glass substrate), 2 ... Display electrode (X electrode, Y electrode), 3, 7 ... Dielectric layer, 4 ... Protective film, 5 ... Back substrate (glass substrate), 6 ... Address electrode, 8 ... Partition wall, 8A ... Horizontal rib (upper side), 8B ... Horizontal rib (lower side), 8C ... Vertical rib (left and right side), 8D ... Horizontal rib, 9 ... Phosphor (fluorescent film), 9b ... Side surface (fluorescent) Film part), 9A ... fluorescent film, 9B ... fluorescent film, 9C ... fluorescent film (double layer film), 9D ... fluorescent film (single film), 9E ... light reflecting layer (reflective film), 10 ... PDP (panel) , 11 ... first structure (front substrate structure), 12 ... second structure (back substrate structure), 13 ... discharge space (inter-substrate area), 40 ... cell (light emitting area), 50 ... exhaust path, 60 ... Optical filter, 80 ... Low reflective rib material (black rib), 90 ... Phosphor paste, EX, EY ... Opaque electrode.

Claims (20)

A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a body and a display electrode for applying a voltage to the discharge cell,
At least one pair of two sides arranged symmetrically with respect to the center when the discharge cell is viewed in plan, from among the plurality of partition walls constituting the discharge cell in the entire surface or a partial region of the panel. The height of the partition walls is different from each other,
Among the plurality of sides of the barrier ribs constituting the discharge cell, the height ha of the barrier ribs disposed on the upper side of the discharge cell is higher than the height hb of the barrier ribs disposed on the lower side. Plasma display panel. The plasma display panel according to claim 1, wherein
A plasma display panel, wherein a width wa of a top portion of a partition wall portion disposed on an upper side of the discharge cell is wider than a width wb of a top portion of a partition wall portion disposed on a lower side. The plasma display panel according to claim 1, wherein
The plasma display panel according to claim 1, wherein the height hc of the barrier ribs located on the left and right sides of the discharge cell is the same as the height hb of the barrier ribs arranged on the lower side. The plasma display panel according to claim 1, wherein
The plasma display panel according to claim 1, wherein a height hc of the barrier ribs located on the left and right of the discharge cell is the same as a height ha of the barrier ribs disposed on the upper side. The plasma display panel according to claim 1, wherein
The height hc of the barrier ribs located on the left and right in the discharge cell is lower than the height ha of the barrier ribs arranged on the upper side and higher than the height hb of the barrier ribs arranged on the lower side. A characteristic plasma display panel. The plasma display panel according to claim 1, wherein
The difference Δhab between the height ha and the height hb is
(1) Δhab is 15 μm or more. (2) Δhab is 0.1 × ha or more. The plasma display panel satisfies at least one of the two conditions. The plasma display panel according to claim 1, wherein
At least a part of the electrodes constituting the display electrode is an opaque electrode formed of an opaque material, and the height hb is in a range of 0.58 times or more and 1.73 times or less of the width L of the opaque electrode. And a plasma display panel. The plasma display panel according to claim 1, wherein
At least a part of the electrodes constituting the display electrode is an opaque electrode formed of an opaque material, and the height hb is in a range of 1.00 to 1.43 times the width L of the opaque electrode. And a plasma display panel. The plasma display panel according to claim 1, wherein
The plasma display panel according to claim 1, wherein the height hb is in the range of 23 μm to 138 μm. The plasma display panel according to claim 1, wherein
The plasma display panel according to claim 1, wherein the height hb is in the range of 40 μm to 114 μm. The plasma display panel according to claim 2, wherein
The difference Δw between the width wa and the width wb is
(1) Δw is 15 μm or more (2) Δw is 0.1 × wa or more The plasma display panel satisfies at least one of the two conditions. The plasma display panel according to claim 1, wherein
A plasma display panel characterized in that a material constituting the partition wall in the discharge cell is made of a black material having a low reflectance. A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a body and a display electrode for applying a voltage to the discharge cell,
The reflectance of the phosphor film formed by the phosphor formed on the upper partition wall in the discharge cell is higher than the reflectance of the phosphor film formed by the phosphor formed on the lower partition wall. ,
Among the plurality of sides of the barrier ribs constituting the discharge cell, the height ha of the barrier ribs disposed on the upper side of the discharge cell is higher than the height hb of the barrier ribs disposed on the lower side. Plasma display panel. A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a body and a display electrode for applying a voltage to the discharge cell,
The thickness of the phosphor formed on the upper barrier rib in the discharge cell is thicker than the thickness of the phosphor formed on the lower barrier rib,
Among the plurality of sides of the barrier ribs constituting the discharge cell, the height ha of the barrier ribs disposed on the upper side of the discharge cell is higher than the height hb of the barrier ribs disposed on the lower side. Plasma display panel. A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a body and a display electrode for applying a voltage to the discharge cell,
The upper barrier rib in the discharge cell is formed with a reflecting layer for reflecting the light emission of the phosphor and the phosphor film thereon, and only the phosphor film is formed on the lower barrier rib. And
Among the plurality of sides of the barrier ribs constituting the discharge cell, the height ha of the barrier ribs disposed on the upper side of the discharge cell is higher than the height hb of the barrier ribs disposed on the lower side. Plasma display panel. The plasma display panel according to claim 15, wherein
In the discharge cell, the reflective layer is formed in a region including the upper barrier rib portion between the barrier ribs, and the phosphor film is formed on the entire region between the barrier ribs with a constant thickness. A plasma display panel. A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a body and a display electrode for applying a voltage to the discharge cell,
In the upper part of the panel, the upper barrier rib part in the discharge cell has a first structure higher than the lower barrier rib part,
In the lower part of the panel, the lower barrier rib part of the discharge cell has a second structure higher than the upper barrier rib part,
In the first structure, of the plurality of sides of the partition wall constituting the discharge cell, the height ha of the partition disposed on the upper side of the discharge cell is higher than the height hb of the partition disposed on the lower side. Higher
In the second structure, the height hb of the partition wall portion disposed on the lower side of the discharge cell among the plurality of partition wall portions constituting the discharge cell is higher than the height ha of the partition wall portion disposed on the upper side. The plasma display panel is characterized by being high. A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a body and a display electrode for applying a voltage to the discharge cell,
The upper part of the panel has a first structure in which the reflectance of the phosphor formed on the upper partition wall portion in the discharge cell is higher than the reflectance of the phosphor formed on the lower partition wall portion,
In this panel the bottom, have a second structure higher than the reflectance of the phosphor reflectance is formed in the partition wall portion of an upper side of the phosphor is formed in the partition wall portion of the lower side of the discharge cell,
In the first structure, of the plurality of sides of the partition wall constituting the discharge cell, the height ha of the partition disposed on the upper side of the discharge cell is higher than the height hb of the partition disposed on the lower side. Higher
In the second structure, the height hb of the partition wall portion disposed on the lower side of the discharge cell among the partition portions of the plurality of sides constituting the discharge cell is higher than the height hb of the partition wall portion disposed on the upper side. The plasma display panel is characterized by being high . A discharge space in which a discharge gas for forming a discharge is enclosed; a plurality of discharge cells partitioned by barrier ribs in the discharge space; and fluorescence that emits visible light by excitation by ultraviolet rays generated by the discharge between the barrier ribs. A plasma display panel having at least a display electrode for applying a voltage to the discharge cell,
In the step of forming the barrier rib in the discharge cell, the height of the barrier rib portion arranged on the upper side of the discharge cell among the barrier rib portions of the plurality of sides constituting the discharge cell is Formed to be higher than the height hb,
In the step of forming the phosphor in the discharge cell, the substrate structure is inclined in the phosphor paste drying step, thereby forming a film thickness distribution of the phosphor on the upper partition wall portion in the discharge cell. A method of manufacturing a plasma display panel, characterized in that the phosphor is formed such that the thickness of the phosphor is thicker than the thickness of the phosphor formed in the lower partition wall.   A plasma display device comprising: the plasma display panel according to any one of claims 1 to 18, a drive circuit for driving the panel, and a video signal device for displaying an image on the panel.

Images