JP2006024408A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel easy to manufacture having improved contrast. <P>SOLUTION: The plasma display panel is formed by arranging a front substrate 10 having a pair of display electrodes 14, and a rear substrate 20 having data electrodes 22 and barrier ribs 24 so that the pair of display electrodes 14 cross the data electrodes 22. The barrier ribs 24 consist of lengthwise barrier ribs 24a parallel with the data electrodes 22 and a pair of lateral barrier ribs 24b parallel with the display electrodes 14, the lengthwise ribs 24a and the lateral ribs 24b forming a discharge cell 26 of a well curb shape, and a pair of the lateral ribs 24b forming a non-discharging space 27, with its inner face blackened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plasma display panel, and more particularly to a plasma display panel realizing high contrast.

  2. Description of the Related Art In recent years, color display devices using plasma display panels (hereinafter referred to as PDPs) in color display devices used in image display devices such as computers and televisions can achieve large, thin, and lightweight colors. It is attracting attention as a display device.

  In the PDP, a front substrate made of a glass substrate formed by arranging scan electrodes and sustain electrodes for performing surface discharge and a rear substrate made of a glass substrate formed by arranging data electrodes so that both electrodes form a matrix. In addition, they are arranged in parallel so as to form a discharge space in the gap, and the outer periphery thereof is sealed with a sealing member such as a glass frit.

  Discharge cells partitioned by barrier ribs are provided between the front substrate and the rear substrate, and a phosphor layer is formed in the discharge cell space between the barrier ribs. In the PDP having such a configuration, color display is performed by generating ultraviolet rays by gas discharge and exciting the phosphors of red, green, and blue colors with the ultraviolet rays to emit light (for example, Patent Document 1). .

  FIG. 3 is an exploded perspective view showing the structure of such a conventional PDP. As shown in FIG. 3, the PDP includes a front substrate 30 and a back substrate 40. The front substrate 30 includes a plurality of scan electrodes 32 and sustain electrodes 33 arranged in parallel to each other on a front glass substrate 31 to form a pair of display electrodes 34, and a dielectric layer 35 and MgO that protects the dielectric layer 35 thereon. The protective film 36 is covered. The scanning electrode 32 and the sustain electrode 33 are configured by laminating transparent electrodes 32a and 33a made of ITO and bus electrodes 32b and 33b made of a metal film, respectively.

  A black film 37 called a black stripe is formed between the scanning electrode 32 and the sustaining electrode 33 between the pair of adjacent display electrodes 34 to improve the black display quality and increase the contrast.

  On the other hand, the back substrate 40 has a plurality of strip-like data electrodes 42 orthogonal to the display electrodes 34 disposed on the back glass substrate 41, and a plurality of the back plate dielectric layers 43 covering the data electrodes 42 and further partitioning the discharge space. The parallel barrier ribs 44 are formed, and red, green and blue phosphor layers 45 are formed on the back plate dielectric layer 43 and the barrier ribs 44. The periphery of the front substrate 30 and the back substrate 40 is sealed with a sealing member, and a discharge gas such as neon or xenon is injected into the discharge space and sealed with a pressure of 53 kPa to 80 kPa.

  With such a configuration, by applying a voltage to the display electrode 34 to generate plasma discharge and irradiating the phosphor layer 45 with the generated ultraviolet light, it is possible to emit red, green, and blue colors.

In recent years, there has been a demand for further improvements in luminance and contrast as image quality as screens have higher definition. As an example of improving the brightness and contrast, an example is disclosed in which the color of the partition wall of the rear substrate is white in the light emission unit and the partition wall between adjacent light emission units is black (for example, Patent Document 2).
JP 2001-195990 A JP 2000-1113825 A

  However, in the PDP having the above-described configuration, in the example in which a black film called a black stripe for increasing contrast is provided on the front substrate, it is necessary to form the black stripe with high accuracy, and the display electrodes constituting the front substrate It has been necessary to select a material that does not have an insulating property with respect to the dielectric layer or a mutual influence in the baking process. Therefore, the manufacturing process requires many steps of printing, drying, exposure, development, and baking, and has a problem that the material cost is increased.

  On the other hand, for the purpose of improving the contrast and brightness, in the example in which the color of the partition wall of the back substrate is white in the light emitting unit and the partition wall between adjacent light emitting units is black, it is necessary to change the partition material in forming the partition wall. However, the manufacturing process is not only complicated, but also has a problem of high cost.

  The present invention solves the above-described problems, and provides a PDP with excellent image quality that is easy to manufacture and has improved contrast and brightness.

  In order to solve the above-described problems, the PDP of the present invention includes a front substrate on which a pair of display electrodes are formed, a rear substrate on which data electrodes and barrier ribs are formed, and a pair of display electrodes and data electrodes. A PDP that is arranged so as to face each other, the partition wall including a vertical barrier rib parallel to the data electrode and a horizontal barrier rib parallel to the pair of display electrodes, and a discharge cell and a non-discharge formed by the vertical barrier rib and the horizontal barrier rib And the surface of the non-discharge space is black.

  In this way, by setting the inner surface of the non-discharge space to black, the effect of the light-shielding film can be exhibited and the contrast can be improved, as in the case of forming the black film on the conventional front substrate, and further the display Since the material and the formation process can be selected regardless of the electrode and the dielectric layer, a high-contrast PDP can be realized at low cost.

  Furthermore, it is desirable that black be formed of black paste, and the inner surface of the non-discharge space formed by the pair of horizontal barrier ribs can be made black at low cost.

  As described above, according to the present invention, a black stripe can be manufactured more easily than a conventional black stripe, and a PDP with excellent contrast can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a PDP according to an embodiment of the present invention, and FIG. As shown in FIG. 1, the PDP includes a front substrate 10 and a rear substrate 20. 1 and 2, in front substrate 10, scanning electrode 12 and sustaining electrode 13 are arranged in parallel to each other on front glass substrate 11, and a plurality of strip-shaped display electrodes 14 are formed thereon, and a dielectric is formed thereon. The body layer 15 and a protective film 16 made of MgO for protecting the body layer 15 are covered. A gap 29 of a certain distance is provided between the pair of adjacent display electrodes 14 in order to maintain insulation between the adjacent display electrodes 14, and the scan electrode 12 and the sustain electrode 13 are respectively made of ITO or the like. The transparent electrodes 12a and 13a made of and the bus electrodes 12b and 13b made of a metal film are laminated.

  On the other hand, the back substrate 20 includes a plurality of data electrodes 22 disposed on the back glass substrate 21 at right angles to the display electrodes 14 of the front substrate 10, and a back plate dielectric layer 23 disposed so as to cover the data electrodes 22. And a partition wall 24 provided on the back plate dielectric layer 23. Here, the barrier ribs 24 are constituted by vertical barrier ribs 24a parallel to the data electrodes 22 and horizontal barrier ribs 24b orthogonal thereto, and the vertical barrier ribs 24a and the horizontal barrier ribs 24b form a grid-shaped discharge cell 26, and a pair of adjacent A non-discharge space 27 is formed by the horizontal barrier ribs 24b. That is, the horizontal barrier ribs 24b are formed to be parallel to the display electrodes 14 of the front substrate 10 when the front substrate 10 and the rear substrate 20 are disposed to face each other. Further, red, green, and blue phosphor layers 25 are sequentially formed on the surfaces of the back plate dielectric layer 23, the vertical barrier ribs 24a, and the horizontal barrier ribs 24b in the discharge cell 26 corresponding to the data electrodes 22. A black paste or the like is filled or applied so that the side surfaces of the horizontal barrier ribs 24b serving as the inner surfaces of the non-discharge spaces 27 and the back plate dielectric layer 23 are black.

  The front substrate 10 and the rear substrate 20 are arranged to face each other via the partition wall 24 to form a discharge space and a non-discharge space 27 of the discharge cell 26, and a discharge gas such as neon or xenon is pressured from 53 kPa to 80 kPa in these spaces. It is sealed with. Plasma discharge is generated between the display electrodes 14, and the phosphor layer 25 is irradiated with ultraviolet rays generated from the discharge gas sealed in the discharge cell 26, thereby emitting red, green, and blue colors. .

  On the other hand, the front substrate 10 and the rear substrate 20 are arranged to face each other as shown in the figure. That is, the pair of display electrodes 14 adjacent to the front substrate 10 are provided corresponding to the discharge cells 26 of the rear substrate 20, and the gap portion 29 between the pair of display electrodes 14 of the front substrate 10 is a non-discharge space 27 of the rear substrate 20. It is provided corresponding to.

  That is, in the conventional PDP, the black film is provided in the gap part 29 of the front substrate 10. However, in the embodiment of the present invention, the gap part 29 is not formed in the gap part 29 of the front substrate 10. The inner surface of the non-discharge space 27 of the back substrate 20 corresponding to is black.

  In recent years, there is a demand for higher definition of the screen, and there is a tendency to reduce the size of the discharge cells. However, when the discharge cell is made smaller, there arises a problem that the surface area of the phosphor layer is reduced and the luminance is lowered, and a gap between the electrodes is narrowed, so that an interference is easily generated due to interference with an adjacent discharge cell. Further, in order to reduce the size of the discharge cell, it is necessary to form the display electrode finely and with high accuracy. In particular, in the conventional PDP configured as shown in FIG. 3, if the black film 37 provided between the pair of adjacent display electrodes 34 is not formed with high accuracy, the black film 37 and the bus electrodes 32b and 33b are connected to each other. There arises a problem that a space is formed between them and the light shielding effect is impaired.

  According to the embodiment of the present invention, as shown in FIG. 1, since the discharge cells 26 have a cross-beam shape, the phosphor layer 25 is also formed on the horizontal barrier rib 24b to increase the area of the phosphor layer 25 and increase the luminance. While improving, the misdischarge with an adjacent cell can be prevented. Further, a non-discharge space 27 is formed by a pair of adjacent horizontal barrier ribs 24b forming the discharge cells 26 in a cross-beam shape, and a black coating film 28 is formed to make the inner surface black.

  By making the inner surface of the non-discharge space 27 black in this way, it is not necessary to form a black film on the front substrate 10 with high accuracy. That is, when the non-discharge space 27 corresponding to the gap portion 29 of the front substrate 10 is viewed from the front substrate 10 side, the contrast is high because the light shielding effect is high and excellent contrast can be obtained.

  Further, as in the prior art, in order to form a black film in the gap portion of the front substrate 30, a step of printing a black material on the front glass substrate 31, a step of drying, a step of exposing, a step of developing, and further firing are performed. Many processes such as processes are required. Furthermore, insulation between the adjacent scan electrode 32 and sustain electrode 33 is ensured, and the transparent electrodes 32a and 33a, the bus electrodes 32b and 33b, or the dielectric layer 35 are not affected by material alteration in these steps. Thus, it was necessary to strictly manage the material components and process conditions of the black film. On the other hand, according to the embodiment of the present invention, the black material of the black coating film 28 formed in the non-discharge space 27 has an influence on the display electrode 14 and the dielectric layer 15 which are constituent elements of the front substrate 10. Therefore, the choice of materials increases, and the material cost can be reduced. For example, when forming a black film on the front substrate, expensive ruthenium oxide or the like is used in order to enhance insulation. However, according to the embodiment of the present invention, only a black material is required, and the material cost is reduced. Can be reduced.

  Moreover, as a method of making the inner surface of the non-discharge space 27 black, a method of forming a black coating film 28 by filling and applying a paste of a black material into the non-discharge space 27 is preferable. As this method, a screen printing method, a dispenser coating method, or the like can be used. These methods do not require complicated steps such as an exposure step and a development step, and are dried after being applied, for example, and simultaneously fired with the phosphor layer 25 applied to the discharge cell 26 to simplify the steps. Is possible. Therefore, the entire manufacturing process can be simplified and the manufacturing cost can be reduced.

  In the above-described embodiment of the present invention, the example in which the vertical barrier ribs 24a are not formed in the non-discharge space 27 has been described. However, the vertical barrier ribs 24a may be provided in the non-discharge space 27. It is preferable that the height of the vertical partition wall 24a in the space 27 is lower than that of the horizontal partition wall 24b, and a black material is also formed on the top of the vertical partition wall 24a.

  Further, in the above-described example, the example in which the black coating film 28 is formed on the side surface of the horizontal partition wall 24b which is the inner surface of the non-discharge space 27 and the back plate dielectric layer 23 has been described. The same effect can be achieved by filling with material.

  According to the PDP of the present invention, a PDP that is easy to manufacture and has improved contrast can be realized, which is useful for a large-screen display device or the like.

The exploded perspective view of PDP in an embodiment of the invention AA sectional view in FIG. Exploded perspective view of a conventional PDP

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Front substrate 11 Front glass substrate 12 Scan electrode 12a, 13a Transparent electrode 12b, 13b Bus electrode 13 Sustain electrode 14 Display electrode 15 Dielectric layer 16 Protective film 20 Back substrate 21 Back glass substrate 22 Data electrode 23 Back plate dielectric layer 24 Partition 24a Vertical partition 24b Horizontal partition 25 Phosphor layer 26 Discharge cell 27 Non-discharge space 28 Black coating film 29 Gap part

Claims (2)

A plasma display panel in which a front substrate on which a pair of display electrodes are formed and a rear substrate on which data electrodes and partition walls are formed are arranged so as to face each other so that the pair of display electrodes and the data electrodes intersect. ,
The barrier rib includes a vertical barrier rib parallel to the data electrode and a horizontal barrier rib parallel to the pair of display electrodes, forming a discharge cell and a non-discharge space formed by the vertical barrier rib, the horizontal barrier rib, and the non-discharge space. A plasma display panel characterized in that the surface of the discharge space is black. The plasma display panel according to claim 1, wherein black is formed of a black paste.

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