JP2005019008A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel (PDP) for improving the quality of an image by restraining reduction in reflection luminance caused by external light at a bright place to improve contrast at the bright place without deteriorating the light emitting luminance of a display panel. <P>SOLUTION: In this PDP, a black stripe part 51 is disposed between adjacent display electrodes 4, and a first black part 16, a second black part 17 and a third black part 18 are formed at each of the same positions of each bus electrode 2b and bus electrode 3b composing a scanning electrode 2 and a sustaining electrode 3, respectively, and of the black stripe part 51, at small intervals in a direction perpendicular to the PDP surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display panel (hereinafter referred to as a PDP) that displays an image by exciting and emitting phosphors with ultraviolet rays generated by gas discharge, which is known as a large-screen, thin, and lightweight display device. The present invention relates to a panel structure of an (AC) type PDP.
[0002]
[Prior art]
The PDP is a display that displays an image by exciting and emitting phosphors with ultraviolet rays generated by gas discharge. It can be classified into AC (alternating current) type and DC (direct current) type according to the discharge forming method, and the AC type PDP is said to be superior to the DC type in terms of luminance, luminous efficiency, and life.
[0003]
Next, a panel structure of a conventional AC type PDP will be described with reference to FIGS. 3, 4, 5, and 6. FIG. FIG. 3 is a partially broken perspective view for explaining a panel structure of a conventional AC type PDP, FIG. 4 is an electrode arrangement diagram of a conventional AC type PDP having a matrix configuration of M columns × N rows, and FIG. FIG. 6 is an enlarged plan view of a discharge cell portion viewed from above the front substrate of the AC type PDP, and FIG. 6 is a diagram for explaining the effect of reducing external light reflection by the black portion in the black stripe portion of the conventional AC type PDP. is there.
[0004]
In FIG. 3, a plurality of pairs of stripe-shaped display electrodes 4 are formed on the transparent front substrate 1 so as to be paired with the scan electrodes 2 and the sustain electrodes 3. The scan electrodes 2 and the sustain electrodes 3 are respectively transparent. An electrode 2a, a transparent electrode 3a, a bus electrode 2b made of a metal thin film such as silver (Ag) electrically connected to the transparent electrode 2a and the transparent electrode 3a, and a bus electrode 3b, respectively. The electrode 3b is arrange | positioned in the edge part on the side far from the surface discharge gap in each transparent electrode 2a and the transparent electrode 3a. Further, a dielectric layer 5 is formed on the front substrate 1 so as to cover a plurality of pairs of display electrodes, and a protective layer 6 is further formed on the dielectric layer 5 to constitute a front panel 7. Yes.
[0005]
A plurality of data electrodes 10 covered with an insulator layer 9 are formed on the back substrate 8, and a partition wall 11 is provided on the insulator layer 9 between adjacent data electrodes 10 in parallel with the data electrodes 10. ing. In addition, the phosphor layer 12 is provided on the surface of the insulator layer 9 and the side surface of the partition wall 10, and the back panel 13 is constituted by these.
[0006]
The front panel 7 and the back panel 13 are arranged to face each other with the discharge space 14 therebetween so that the scanning electrode 2 and the sustain electrode 3 in the front panel 7 and the data electrode 10 in the back panel 13 are orthogonal to each other. And a rare gas such as helium (He), neon (Ne), argon (Ar), xenon (Xe) or the like as a discharge gas is sealed in the discharge space 14 so that two adjacent partition walls 11 are sealed. A discharge cell 15 is formed in the discharge space 14 at the intersection of the scan electrode 2 and the sustain electrode 3 that are sandwiched between and opposed to the data electrode 10, and each discharge cell 15 has red, The phosphor layers 12 that are excited and emitted in green and blue, respectively, are sequentially arranged for each color to constitute a display panel of the AC type PDP 31.
[0007]
Next, the operation of the main body of the display panel of the AC type PDP 31 will be described. As shown in the electrode array diagram of this display panel in FIG. 4, it has a matrix configuration comprising M columns × N rows of discharge cells, and N rows of scan electrodes SCN in the row direction. ₁ ~ SCN _n And sustain electrode SUS ₁ ~ SUS _n Are arranged, and M columns of data electrodes D are arranged in the column direction. ₁ ~ D _n Are arranged. An AC voltage of several tens of kHz to several hundreds of kHz is applied between the electrodes to generate a discharge in the discharge space, and the phosphor layer 12 is excited by ultraviolet light from, for example, excited helium (He) atoms in the discharge gas. The display operation is performed by generating visible light. That is, in FIG. 4, an image is displayed by performing the above-described display operation in an area composed of a plurality of discharge cells 15 where the intersections of the display electrode 4 and the data electrode 10 are located.
[0008]
In a display operation in a bright place of the display panel of the AC type PDP 31 configured as described above, reflection of external light by the phosphor layer 12 or the like occurs. The reflection brightness of the outside light is one of the very large factors that influence the quality of the image quality. When the reflection brightness is large, the contrast of the display image is lowered, and the display image looks white. The quality of the display image including the image is significantly deteriorated.
[0009]
In order to suppress the reflection brightness of the external light, a method of providing a black stripe portion, which is a band-shaped light-shielding film, on the display panel of the AC type PDP 31 has been proposed (for example, see Patent Document 1). Next, the black stripe portion provided for suppressing the reflection luminance of the external light will be described with reference to FIGS.
[0010]
When the front panel 7 of the conventional AC type PDP 31 is viewed from above, the front substrate 1, the dielectric layer 5 and the protective layer 6 are all translucent. In FIG. 5, the transparent electrode 2a of the scanning electrode 2 and the transparent electrode 3a of the sustaining electrode 3 indicated by broken lines are transparent and cannot be recognized in actual appearance. However, the bus electrode 2b of the scan electrode 2 and the bus electrode 3b of the sustain electrode 3 are generally black or dark and appear black without transmitting light. Further, a black stripe portion 51 is formed between the adjacent display electrodes 4, and the bus electrodes 2 b of the scan electrodes 2 and the sustain electrodes 3 constituting the display electrode 4 in order to suppress external light reflection in a bright place. Further, like the bus electrode 3b, it is black or dark and does not transmit light or hardly transmits light. Since the discharge is generated between the scan electrode 2 and the sustain electrode 3, even if the black stripe portion 51 is introduced, the position where the black stripe portion 51 is formed is a place where no discharge is originally generated. The light emission from the display panel is not impaired. That is, it does not reduce the light emission luminance of the PDP.
[0011]
Next, the effect of reducing external light reflection by the black portions in the bus electrode 2b and bus electrode 3b and the black stripe portion 51 will be described with reference to FIG. It is appropriate to consider that light is incident on the display panel from an oblique direction when it is exposed to illumination light such as a fluorescent lamp in the room or external light such as sunlight. Of course, it is considered that light is incident from all directions due to reflection of surrounding objects, but the most dominant external light can be regarded as light from an oblique angle of about 45 degrees. Consider a case in which external light 61 from an angle of about 45 degrees is incident on the display panel. FIG. 6A is a cross-sectional view showing the AC type PDP 31 cut on the data electrode 10 along a line parallel to the data electrode 10. As shown in FIG. 6A, the shadow of the bus electrode 2 b of the scan electrode 2, the bus electrode 3 b of the sustain electrode 3, and the black stripe portion 51 due to the external light 61 is projected onto the phosphor layer 12. FIG. 6B is a plan view showing how a shadow portion projected on the phosphor layer 12 looks when an observer sees the front panel 7 perpendicularly from above. The reflected luminance due to the external light received by the observer viewed from the direction perpendicular to the surface of the front panel 7 is expressed by the integral value of the bright and dark part, that is, proportional to the area of the bright and dark part. . That is, the bus electrode 2b of the scan electrode 2, the bus electrode 3b of the sustain electrode 3, and the black stripe portion 51 are projected in the direction perpendicular to the surface of the front panel 7 and the bus electrode 2b of the scan electrode 2 The total area of the shadow portions 63 of the sustain electrode 3 in the direction of the external light 61 of the bus electrode 3 b and the black stripe portion 51 is a portion that suppresses reflection with respect to the external light 61. Accordingly, the bus electrode 2b of the scan electrode 2 and the bus electrode 3b of the sustain electrode 3 and the black stripe portion 51 which are simply formed on the front panel 7 and the black stripe portion 51 are projected only on the shadow portion 62 projected on the phosphor layer in the vertical direction of the panel. It is an important factor to suppress the reflection luminance due to external light, not to suppress the reflection but to make the bus electrode 2b of the scan electrode 2 and the bus electrode 3b of the sustain electrode 3 and the shadow portion 63 of the black stripe portion 51 effectively. Become.
[0012]
However, in the above description, in order to simplify the description, the light refractive index of each element constituting the AC type PDP is set to 1, and the light is not refracted at the boundary between the elements, and the incident light. It is described as going straight in the direction of the path. However, in actuality, the light refractive index of each element is not necessarily 1, and light is refracted at the boundary between the elements. Therefore, it is necessary to consider the refractive index of the light of each element for accuracy. .
[0013]
[Patent Document 1]
JP 2000-82408 A (page 4, FIG. 2)
[0014]
[Problems to be solved by the invention]
However, in the above-described conventional AC type PDP 31, in order to improve the contrast of the display image while suppressing the reflection luminance, the bus electrode 2b of the scan electrode 2 and the bus electrode 3b of the sustain electrode 3 formed on the front panel 7 and the black stripe. If the width of the portion 51 is too wide, the light emission from the display panel cannot be effectively extracted, and the reflection brightness of the external light in a bright place cannot be suppressed while maintaining the light extraction from the display panel, and the contrast is reduced. There has been a problem of degrading and degrading the image quality.
[0015]
The present invention solves such problems, and provides an AC type PDP that suppresses reflection brightness of external light, improves contrast in bright places, and improves image quality without lowering light emission brightness. With the goal.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the PDP of the present invention forms a plurality of display electrodes including a transparent electrode and a bus electrode, and forms a dielectric layer so as to cover the display electrodes, and between display electrodes adjacent to each other. It has a front side substrate in which a black stripe portion is formed and a back side substrate in which a plurality of data electrodes are formed in a direction orthogonal to the display electrodes, and the front side substrate and the back side substrate are arranged to face each other with a discharge space interposed therebetween. In the PDP, a plurality of black portions are provided corresponding to at least one of the bus electrodes and the black stripe portions at positions different from the positions of the bus electrodes and the black stripe portions of the display electrodes in a direction perpendicular to the surface of the front substrate. Have a configuration.
[0017]
With this configuration, it is possible to suppress external light reflection luminance, improve contrast in a bright place, and improve image quality without reducing light emission luminance.
[0018]
In addition, the PDP of the present invention has a configuration in which the black portion is formed using an opaque material having substantially the same width as the corresponding bus electrode and black stripe portion. Furthermore, the PDP of the present invention has a configuration in which the black portion is provided in the dielectric layer of the front substrate and a configuration in which the black portion is provided on the display surface side surface of the front substrate. In addition, it has a configuration in which the formation position of the black part is set so that the overlapping part between the invisible part due to the bus electrode and the black stripe part and the shadow projected on the phosphor layer by the black part is minimized. ing.
[0019]
With these configurations, the area of the shadow formed on the phosphor layer effective for suppressing reflection on the surface of the phosphor layer is increased, and the reflected luminance due to external light can be further reduced by one layer.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a PDP according to an embodiment of the present invention will be described in detail with reference to the drawings.
[0021]
(Embodiment 1)
FIG. 1 is a diagram showing the configuration of the main part of an AC type PDP according to Embodiment 1 of the present invention and the brightness and darkness of a shadow projected on its phosphor layer. In FIG. 1, it is shown in FIGS. The same reference numerals are given to the same elements as the conventional components.
[0022]
First, the overall configuration of the AC type PDP in Embodiment 1 of the present invention is the configuration as shown in FIGS. That is, on the transparent front side substrate 1 such as a glass substrate, a plurality of pairs of striped display electrodes 4 that are paired with the scan electrodes 2 and the sustain electrodes 3 are formed. The scan electrode 2 and the sustain electrode 3 are made of, for example, ITO or tin oxide (SnO ₂ ) And the like, and the bus electrode 2b and the bus electrode 3b made of a metal thin film such as silver (Ag), which are electrically connected to the transparent electrode 3a and the transparent electrode 2a and the transparent electrode 3a, respectively. The bus electrode 2b and the bus electrode 3b are arranged at the edge portions on the side far from the surface discharge gap in the transparent electrode 2a and the transparent electrode 3a. Further, a dielectric layer 5 made of, for example, low-melting glass is formed on the front substrate 1 so as to cover a plurality of pairs of display electrodes. Further, for example, magnesium oxide is formed on the dielectric layer 5. A protective layer 6 made of (MgO) is formed to constitute a front panel 7.
[0023]
Further, on the back substrate 8 opposed to the front substrate 1, it was covered with an insulator layer 9 in a direction orthogonal to the scanning electrodes 2 and the sustain electrodes 3 on the front substrate 1. A plurality of data electrodes 10 are formed, and a plurality of stripe-shaped partition walls 11 are provided in parallel with the data electrodes 10 on the insulator layer 9 between the adjacent data electrodes 10. In addition, a phosphor layer 12 is provided on the surface of the insulator layer 9 and the side surface of the partition wall 11, thereby constituting a back panel 13.
[0024]
The front panel 7 and the back panel 13 are arranged to face each other with a minute discharge space 14 so that the scan electrode 2 and the sustain electrode 3 and the data electrode 10 are orthogonal to each other, and the periphery is sealed, and For example, a rare gas such as helium (He), neon (Ne), argon (Ar), or xenon (Xe) is sealed in the discharge space 14 at a pressure of approximately 66.5 kPa (500 Torr). . A discharge cell 15 is formed in a discharge space 14 sandwiched between two adjacent barrier ribs 11 and intersecting the data electrode 10, the scan electrode 2 and the sustain electrode 3. The phosphor layers 12 that excite and emit light in green and blue are sequentially arranged one by one to constitute a display panel of the AC type PDP 31.
[0025]
The display panel of the AC type PDP 31 has a matrix configuration in which the electrode array is composed of M columns × N rows of discharge cells, and N rows of scan electrodes SCN in the row direction. ₁ ~ SCN _n And sustain electrode SUS ₁ ~ SUS _n Are arranged. An AC voltage of several tens of kHz to several hundreds of kHz is applied between the electrodes to generate a discharge in the discharge space, and the phosphor layer 12 is excited by ultraviolet light from, for example, excited helium (He) atoms in the discharge gas. The display operation is performed by generating visible light. That is, an image is displayed by performing the above-described display operation in a region constituted by a plurality of discharge cells 15 where the intersections of the display electrodes 4 and the data electrodes 10 are located.
[0026]
Here, in the PDP according to the present invention, as shown in FIG. 1A, the first dielectric layer 5a is formed so as to cover the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51, and the first dielectric layer 5a is formed. On the dielectric layer 5a, an opaque material having substantially the same width is used so as to overlap with the corresponding ones of the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51 in a direction perpendicular to the surface of the display panel. The first black portion 16, the second black portion 17, and the third black portion 18 are formed, and the lower second dielectric layer 5b is formed so as to cover them. That is, the bus electrode 2b, the bus electrode 3b, and the black stripe are located at positions different from the positions of the bus electrode 2b of the scan electrode 2, the bus electrode 3b of the sustain electrode 3, and the black stripe portion 51 in the direction perpendicular to the surface of the display panel. Corresponding to the part 51, a first black part 16, a second black part 17, and a third black part 18 are provided.
[0027]
In order to form the first black portion 16, the second black portion 17, and the third black portion 18 shown in FIG. 1, the bus electrode 2b of the scan electrode 2, the bus electrode 3b of the sustain electrode 3, and the black The mask can be formed by using the same mask as that for forming the stripe portion 51. Therefore, the mask alignment for patterning the first black portion 16, the second black portion 17, and the third black portion 18 is possible. The first black portion 16, the second black portion 17, and the third black portion 18 can be formed without reducing the yield due to the shift.
[0028]
Further, at the same time when the transparent electrode 2a and the transparent electrode 3a are formed, the black stripe base portion 101 may be formed at a position where the black stripe portion 51 is formed, and the black stripe portion 51 may be formed thereon, or The thickness of the transparent electrode 2a and the transparent electrode 3a is much smaller than that of the bus electrode 2b and the bus electrode 3b, so that the transparent electrode 2a and the transparent electrode 3a are formed directly on the front substrate 1 without the black stripe base 101. Also good.
[0029]
External light 61 from the most dominant oblique angle of about 45 degrees is incident on the AC type PDP 100 in which the first black portion 16, the second black portion 17, and the third black portion 18 are arranged. FIG. 1B shows shadows formed by the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51, and the first black portion 16, the second black portion 17, and the third black portion 18 in the case of FIG. Will be described. In order to simplify the description, as in the description of the conventional configuration described above, it is assumed that the refractive index of light of each element constituting the AC type PDP 100 is 1, and the direction has an oblique angle of about 45 degrees. A description will be given by taking, as an example, a shadow formed by the black stripe portion 51 and the third black portion 18 when receiving the external light 61 from.
[0030]
The outermost points A and B of the shadow of the black stripe 51 projected onto the phosphor layer 12 by the external light 61 correspond to the points a and b of the black stripe 51, while the external light 61 The outermost points C and D of the shadow of the third black portion 18 projected onto the phosphor layer 12 correspond to the points c and d of the third black portion 18. Therefore, the outermost point of the shadow 102 where the black stripe portion 51 and the third black portion 18 facing each other across the first dielectric layer 5 a are projected onto the phosphor layer 12 by the external light 61 is the black stripe portion 51. The point a and the point d of the third black portion 18 become the projected shadow points A and D, respectively. Therefore, the width of the shadow 102 is the distance from the outermost point A to the outermost point D of the shadow 102.
[0031]
Therefore, the shadow 102 projected onto the phosphor layer 12 by providing the third black portion 18 has a larger area shadow than the conventional configuration in which the black stripe portion 51 is provided alone. Thus, the reflected luminance due to the external light 61 can be reduced, and on the other hand, the black stripe portion 51 and the third black portion 18 when the display panel is viewed from the direction perpendicular to the surface overlap, The light extracted from the display panel does not decrease, that is, the light emission luminance is not lowered, and the contrast in a bright place can be improved.
[0032]
Further, the shadow of the external light 61 projected on the bus electrode 2b of the scanning electrode 2 and the phosphor layer 12 of the first black portion 16 facing each other across the first dielectric layer 5a, and the first dielectric Regarding the shadow caused by the external light 61 projected onto the bus electrode 3b of the sustain electrode 3 and the phosphor layer 12 of the second black portion 17 facing each other across the layer 5a, the above-described black stripe portion 51 and the third black portion are also included. As in the case of the shadow 102 by 18, a shadow with a large area can be obtained as compared with the conventional case where the bus electrode 2 b of the scan electrode 2 and the bus electrode 3 b of the sustain electrode 3 are formed independently. The reflection brightness by the external light 61 can be reduced without reducing the light emission brightness, and the contrast in a bright place can be improved.
[0033]
By the way, the portion projected onto the phosphor layer 12 when the black stripe portion 51 and the third black portion 18 overlapping in the vertical direction are viewed from the direction perpendicular to the surface of the display panel is visible to the observer. It becomes a non-visible portion 103, that is, an invisible portion 103. Accordingly, the widths of the black stripe portion 51 and the third black portion 18 are set so that the shadow 102 projected on the phosphor layer 12 generated by the black stripe portion 51 and the third black portion 18 does not overlap the invisible portion 103. If the arrangement is set, the reflection luminance due to the external light 61 can be further reduced by one layer. The same applies to the bus electrode 2b, the bus electrode 3b, the first black portion 16, and the second black portion 17. Therefore, an invisible portion formed by the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51, and a shadow projected on the phosphor layer 12 by the first black portion 16, the second black portion 17, and the third black portion 18. By setting the formation positions of the plurality of first black portions 16, the second black portions 17, and the third black portions 18 so as to minimize the overlapping portion, the reflection on the surface of the phosphor layer 12 is performed. Therefore, the area of the shadow formed on the phosphor layer 12 that is effective for suppressing the reflection is increased, and the reflection luminance due to the external light 61 can be further reduced by one layer. The width of the black stripe portion 51 and the arrangement position of the first black portion 16, the second black portion 17, and the third black portion 18 are not limited to the range where the performance of the AC type PDP is adversely affected. The thickness of the first dielectric layer 5a, the second dielectric layer 5b, and the protective layer 6 and the thickness of the discharge space 14 (distance from the protective layer 6 to the phosphor layer 12) may be set as appropriate.
[0034]
In the above description, in order to simplify the description, it is assumed that the optical refractive index of each element constituting the AC type PDP is 1, as in the description of the conventional configuration described above. Although it is assumed that light is not refracted at the boundary between them and goes straight in the direction of the path of the incident light, the light refractive index of each element is not necessarily 1 in reality. Since light is refracted at the boundary between elements, it goes without saying that the light refractive index of each element needs to be considered.
[0035]
Moreover, the 1st black part 16, the 2nd black part 17, and the 3rd black part 18 are not restricted to black at all, What is necessary is just a dark color which blocks visible light.
[0036]
In addition, the first black portion 16, the second black portion 17, and the third black portion 18 do not necessarily have to be made of the same material as that of the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51. Rather, since it is desirable to form the first black portion 16, the second black portion 17 and the third black portion 18 at the same time, the first black portion 16, the second black portion 17 and the third black portion. Most preferably, 18 are the same material. Note that the first black portion 16, the second black portion 17, and the third black portion 18 do not have to be one layer, and may be formed in two or more layers as necessary.
[0037]
As described above, according to the first embodiment of the present invention, even when external light is received in use in a bright place, the first black portion, the second black portion, and the third black portion The area for blocking external light is increased, reflection of external light on the surface of the phosphor layer can be reduced, and the reflection luminance due to external light can be reduced without reducing the emission luminance of the AC type PDP. Therefore, it is possible to realize an AC type PDP that can improve the contrast in a bright place and improve the quality of a displayed image or the like. It is desirable to provide the black part corresponding to each of the bus electrode and the black stripe part. However, even if the black part is provided corresponding to at least one of the bus electrode and the black stripe part, the black part is brighter than before. Contrast can be improved.
[0038]
(Embodiment 2)
FIG. 2 is a diagram showing the main configuration of the AC type PDP in Embodiment 2 of the present invention and the brightness of the shadow projected on the phosphor layer. As shown in FIG. 2A, in this embodiment, the surface of the front substrate 1 of the AC type PDP 200 on the display surface side corresponds to the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51, respectively. A first black portion 21, a second black portion 22, and a third black portion 23 are formed.
[0039]
In FIG. 2A, the first black portion 21, the second black portion 22, the third black portion 23 of the front panel 24, and the bus electrodes of the scan electrode 2 and the sustain electrode 3 constituting the display electrode 4, respectively. The 2b, the bus electrode 3b, and the black stripe portion 51 receive the external light 61 and form respective shadows on the surface of the phosphor layer 12. The sum of the areas of these shadow portions is the sum of the areas of the respective shadow portions by the bus electrodes 2b and the bus electrodes 3b of the scan electrodes 2 and the sustain electrodes 3 constituting the display electrode 4 and the black stripe portion 51. As a result, the reflection area of the phosphor layer 12 with respect to the external light 61 is reduced, and the reflection luminance due to the external light 61 can be reduced. On the other hand, when viewed from the direction perpendicular to the surface of the display panel, the first black portion 21 and the bus electrode 2b of the scanning electrode 2, the second black portion 22 and the bus electrode 3b of the sustain electrode 3, and the third black Since the portion 23 and the black stripe portion 51 are overlapped with each other, the light extracted from the display panel is not reduced, that is, the light emission luminance is not lowered, and the contrast in a bright place can be improved.
[0040]
In FIG. 2B, if the width of the black portion is set so that the invisible portion 25 projected onto the phosphor layer 12 and the overlapping portion 26 of the shadow created by the black portion are reduced, the external light 61 When the light is received, the reflection area by the phosphor layer 12 can be further reduced.
[0041]
In the above-described embodiment, the width of the black portion is substantially the same as the width of the corresponding bus electrode 2b, bus electrode 3b, and black stripe portion 51. However, the width is not limited to this, and the bus electrode 2b is not limited thereto. The bus electrode 3b, the black stripe portion 51, the shadow area formed by the black portion is large, the invisible portion by the bus electrode 2b, the bus electrode 3b and the black stripe portion 51, and the bus electrode 2b, the bus electrode 3b, the black stripe portion 51. When the shadow can be effectively formed so that the overlapping portion with the shadow formed by the black portion is minimized, the width of the black portion is larger than the width of each of the bus electrode 2b, the bus electrode 3b, and the black stripe portion 51. May be small.
[0042]
【The invention's effect】
As described above, according to the present invention, even when external light is received in use in a bright place, the area where the external light is shielded is increased by the black portion, and the shadow formed on the phosphor layer can be effectively increased. And reflection of external light on the surface of the phosphor layer can be reduced. Moreover, since the black portion is formed corresponding to the same position as the bus electrode and the black stripe portion of the display electrode when viewed from the vertical direction of the display panel, it is possible to reduce the light emission luminance as the display panel. Absent.
[Brief description of the drawings]
FIG. 1 is a diagram showing the configuration of the main part of an AC type PDP in Embodiment 1 of the present invention and the brightness of a shadow projected on its phosphor layer
FIG. 2 is a diagram showing a configuration of a main part of an AC type PDP according to Embodiment 2 of the present invention and brightness of a shadow projected on a phosphor layer.
FIG. 3 is a partially broken perspective view for explaining a panel structure of a conventional AC type PDP.
FIG. 4 is an electrode array diagram having a matrix configuration of M columns × N rows of a conventional AC type PDP.
FIG. 5 is an enlarged plan view of a discharge cell portion as seen from the other front side substrate of a conventional AC type PDP.
FIG. 6 is a diagram for explaining an effect of reducing external light reflection by a black portion in a black stripe portion of a conventional AC type PDP.
[Explanation of symbols]
1 Front side board
2 Scanning electrodes
2a, 3a Transparent electrode
2b, 3b bus electrode
3 Sustain electrodes
4 display electrodes
5 Dielectric layer
5a First dielectric layer
5b Second dielectric layer
6 Protective layer
7, 19, 24 Front panel
8 Back side board
9 Insulator layer
10 Data electrode
11 Bulkhead
12 Phosphor layers
13 Back panel
14 Discharge space
15 discharge cells
16, 21 First black portion
17, 22 Second black portion
18, 23 Third black portion
25,103 Invisible part
26 Overlap
31, 100, 200 AC type PDP (AC type plasma display panel)
51 Black stripe
61 Outside light
62, 63 Shadow
101 Black stripe base
102 Shadow
A, a, B, b, C, c, D, d points

Claims (5)

Forming a plurality of display electrodes composed of transparent electrodes and bus electrodes, forming a dielectric layer so as to cover the display electrodes, and forming a black stripe portion between the display electrodes adjacent to each other; and In a plasma display panel having a back side substrate on which a plurality of data electrodes are formed in a direction orthogonal to the display electrode, and the front side substrate and the back side substrate are arranged to face each other with a discharge space interposed therebetween,
A plurality of black colors corresponding to at least one of the bus electrodes and the black stripe portions at positions different from the positions of the bus electrodes and the black stripe portions of the display electrodes in a direction perpendicular to the surface of the front substrate. A plasma display panel characterized in that a part is provided. The plasma display panel according to claim 1, wherein the black portion is formed using a light-impermeable material having substantially the same width as the corresponding bus electrode and the black stripe portion. The plasma display panel according to claim 1, wherein the black portion is provided in the dielectric layer of the front substrate. The plasma display panel according to claim 1, wherein the black portion is provided on a display surface side surface of the front substrate. The formation position of the black part is set so that an overlapping part between an invisible part by the bus electrode and the black stripe part and a shadow projected on the phosphor layer by the black part is minimized. The plasma display panel according to claim 1.

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