JP2005149873A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem of an AC type plasma display panel in which a uniformly formed transparent intermediate layer is provided, grooves are made with a thickness almost the same as that of discharge gaps, tip parts of transparent electrodes connected from X, Y electrodes are arranged at side walls of the grooves, and a dielectric layer is superposed so as to coat the X, Y electrodes with a protecting membrane (MgO) formed over it to make up a display screen side glass substrate; that the transmittance of light from a light-emitting phosphor is degraded in proportion to the thickness of the newly provided transparent intermediate layer. <P>SOLUTION: On the display screen side glass substrate, transparent ribs made of lead glass or the like are provided at places located at the tip parts of the X, Y discharge gaps, the transparent electrode is arranged so as to cover the ribs, and X, Y bus electrodes are arranged so as to connect to it, on which the dielectric layer is uniformly coated by printing. After that, the dielectric layer falling on the discharge gap part is removed by etching with nitric acid, the protecting membrane (MgO) is adhered on the whole surface to complete the display screen side glass substrate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an AC type three-electrode surface discharge AC type plasma display panel.

  A conventional AC-driven three-electrode surface discharge type plasma display panel (hereinafter referred to as an AC type plasma display panel) has a display substrate and a rear substrate arranged to face each other with a discharge space having a predetermined gap. On the display substrate, a plurality of discharge sustain electrodes, which are paired row electrodes facing each other across a discharge gap, are arranged on a glass substrate. The discharge sustaining electrode is composed of an X electrode (also referred to as a common electrode) and a Y electrode (also referred to as a scanning electrode). Each electrode is formed on a transparent electrode such as an ITO film provided on a glass substrate. It consists of a low-resistance bus electrode. The discharge sustaining electrode is covered with a dielectric layer, and the dielectric layer is covered with a protective layer. The rear substrate is formed with addresses which are a plurality of column electrodes coated with a phosphor, and a unit discharge cell in which an intersection of a pair of discharge sustaining electrodes and one column electrode forms one pixel. It has become.

  By the way, when a voltage is applied between the paired X electrode and Y electrode (a pair of discharge sustaining electrodes), the electric lines of force become dense at and near the discharge gap. However, conventionally, since these electric lines of force are confined inside a dielectric layer having a high dielectric constant, the electric lines of force are sparse in the discharge space, the electric field strength is weak, and the sustain discharge start voltage is low. The power consumption is high and cannot be reduced.

  Therefore, a concave portion is provided in the corresponding dielectric layer region on the discharge gap, or a groove is provided so that there is no dielectric layer, and the electric field strength in the discharge gap and its vicinity is increased to reduce the sustain discharge starting voltage. A technique for reducing power consumption is disclosed, for example, in Patent Document 1 below.

JP 11-297215 A

  In Patent Document 1, in order to reduce the sustain discharge start voltage, a recess or a groove is provided in the dielectric layer region corresponding to the discharge gap between the sustain discharge electrodes (a pair of X electrode and Y electrode), and the discharge gap And the electric field strength in the vicinity thereof is increased. Further, in order to maintain the uniformity of the potential distribution between the sustain discharge electrodes (that is, the parallel electric field), a part of the electrodes near the discharge gap of the X and Y electrodes is formed in the groove.

  This is because, as shown in page 3, paragraph numbers 0020 to 0022 of FIG. 4 and FIG. 4 and FIG. 5, a transparent intermediate layer uniformly formed of a low melting point glass layer on the glass substrate of the display substrate. A groove having a width about the same as the discharge gap width is formed by sandblasting, and the tip portion which is a part of the transparent electrode of the X and Y electrodes is arranged on the side wall of the groove, and then the X and Y electrodes are covered. In this way, a dielectric layer is stacked with a uniform thickness, and a protective film (MgO) is formed thereon to constitute a display substrate.

  Thus, in the above-mentioned Patent Document 1, a transparent intermediate layer is newly provided, this is shaved by a sandblast method, a groove is provided, a transparent electrode is disposed on the transparent intermediate layer along the shape thereof, and further, A dielectric layer is uniformly provided thereon. However, a problem arises in that the transmittance of light from the phosphor is reduced by the thickness of the newly provided transparent intermediate layer in the transparent region outside the groove region where the light from the phosphor is emitted.

  The present invention has been made in view of the above circumstances, and its purpose is to reduce the sustain discharge start voltage without reducing the transmittance in the translucent area outside the groove area where the light from the phosphor is emitted. It is to provide a plasma display panel that can be used.

  In order to solve the above-described problems, in the present invention, a first pair of electrode pairs arranged on a display surface side substrate of a pair of substrates opposed to each other with a discharge space interposed therebetween is arranged with a plurality of electrode gaps arranged therebetween. In a plasma display panel comprising one electrode and a second electrode, and a dielectric layer that covers the first electrode and the second electrode with respect to the discharge space, on the display surface side substrate inner surface, The translucent ribs formed at a predetermined thickness (height) are provided in the vicinity of both ends of the discharge gap between the first electrode and the second electrode that form a pair, and the first pair that forms a pair The electrode and the second electrode are formed so as to cover the translucent rib, and the dielectric layer is configured to have a recess or groove having no dielectric layer in a region corresponding to the discharge gap.

  According to this structure, since the groove without the dielectric layer is formed in the discharge gap region, the first electrode opposed to the discharge side gap side wall surface of the translucent rib with the discharge gap interposed therebetween, and Since the opposing portion of the second electrode is formed, the electric lines of force between the paired first electrode and the second electrode become dense between the discharge gaps without the dielectric layer, and the electric field becomes strong, In addition, since the electric potential distribution is uniform and the electric fields are parallel, the sustain discharge start voltage between the paired first electrode and second electrode can be reduced.

  At this time, unlike the above-mentioned Patent Document 1, there is no transparent intermediate layer, and the thickness of the dielectric layer through which the light emitted from the phosphor passes (the thickness of the translucent rib in the portion having the translucent rib). + Thickness of the dielectric layer 7) is substantially the same as the conventional one, and the transmittance of light from the phosphor does not drop compared to the conventional one.

  ADVANTAGE OF THE INVENTION According to this invention, the plasma display panel which can reduce a sustain discharge start voltage can be provided, without reducing the transmittance | permeability in the translucent area | region outside the groove | channel area | region which the light from a fluorescent substance radiate | emits.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected and shown to the component which has a function common to each figure.

  FIG. 1 shows an AC type plasma display panel that is Embodiment 1 of the present invention, and is a cross-sectional view of the AC type plasma display panel as seen from the row electrode (X, Y electrode) side. FIG. 2 is a perspective view of FIG. 1 viewed three-dimensionally.

  In this embodiment, a translucent transparent rib having a predetermined thickness (height) in a vicinity region on the glass substrate substantially corresponding to the tip (both ends) of the discharge gap between the pair of X and Y electrodes. Is provided.

  1 and 2, the display substrate is provided in the vicinity (both ends) of the translucent glass substrate 1 and substantially corresponding to the tip of the discharge gap 20 between the pair of X electrode 3 and Y electrode 4. The transparent transparent rib 2 having a predetermined thickness (height) extending parallel to the row electrode direction, and a plurality of pairs of row electrodes (generally sustain discharges) provided on the glass substrate 1 and the transparent rib 2 A transparent dielectric layer 7 formed so as to cover the row electrode having a groove 21 parallel to the row electrode in a region substantially corresponding to the discharge gap 20; For example, the protective layer 8 made of Mg is provided on the dielectric layer 7.

  The back substrate includes a glass substrate 12, an address electrode 11 disposed on the glass substrate 12 so as to intersect the row electrode, a dielectric layer 10 provided so as to cover the address electrode 11, and a pair of row electrodes. It consists of a partition wall 14 partitioned in the row direction so as to form a unit discharge cell of one pixel at the intersection of address electrodes, and a phosphor 9 applied on the dielectric layer 10 surrounded by the partition wall 14.

  The discharge space 15 between the display substrate and the back substrate is provided with a predetermined gap by the partition wall 14, and a discharge gas (not shown) is sealed between the display substrate and the back substrate.

  The X electrode 3 and the Y electrode 4 described above are composed of transparent electrodes 3a and 4a, which are ITO films, for example, and low-resistance bus electrodes 3b and 4b provided thereon. The ends of the transparent electrodes 3a and 4a on the side of the discharge gap 20 cover the transparent rib 2, and the ends of the transparent electrodes 3a and 4a on the side of the discharge gap 20 along the inclined surface 2a of the transparent rib 2 Opposing portions 3ag and 4ag facing each other across 20 are formed.

  The display substrate according to the present embodiment is first predetermined on the glass substrate 1 on the display substrate side only at positions near the tip portions of the discharge gap 20 between the X electrode 3 and the Y electrode 4 that make a pair. The transparent rib 2 is created by printing a paste material such as a low melting point lead glass so as to have a thickness (height), followed by drying and baking. The predetermined thickness of the transparent rib 2 is not less than 1 μm and not more than t, for example, 25 μm or less, which is substantially the same as the thickness of the transparent electrodes 3a and 4a, where t is the thickness of the dielectric layer. The minimum thickness is preferably larger than the thickness of the bus electrode 3b (4b) from the viewpoint of the uniformity of the potential distribution described later. The shape of the transparent rib 2 is preferably a mountain shape or a trapezoidal shape in consideration of viscosity and the like.

  Thereafter, the transparent rib 3 is covered, and the transparent electrode 3a of the X electrode 3 and the transparent electrode 4a of the Y electrode 4 are about 1 μm thick, for example, until the X bus electrode 3b and the Y bus electrode 4b are disposed. Then, an X bus electrode 3b and a Y bus electrode 4b made of a metal material are formed thereon to form a panel electrode structure.

  Further, a paste-like material mainly composed of a low-melting-point glass powder is uniformly printed on the whole with a thickness of several tens of μm (for example, 30 μm to 50 μm), and the dielectric layer 7 is finished. Next, a portion of the dielectric layer substantially corresponding to the discharge gap 20 is removed by etching with nitric acid or the like to provide a groove 21 reaching the glass substrate 1, and a protective film (MgO) 8 is uniformly deposited on the entire surface by vapor deposition or the like. A display substrate is completed by attaching to the substrate. Note that the manufacturing process of the rear substrate is the same as the conventional process, and the description thereof is omitted.

  In the AC type plasma display panel configured as described above, a sustain discharge occurs in the discharge space 15 when an applied voltage higher than the sustain discharge start voltage is applied between the paired X electrode 3 and Y electrode 4. UV rays are generated. This ultraviolet light excites the phosphor 9 on the back substrate to emit light, and this light passes through the discharge gap and the transparent electrode region of the display substrate and is emitted from the display substrate to display an image to the viewer.

  At this time, the electric lines of force 30 between the paired X electrode 3 and Y electrode 4 have a groove 21 without a dielectric layer formed in the region of the discharge gap 20 as shown in FIG. The discharge gap side facing portions 3ag and 4ag of the transparent electrode 3a of the X electrode 3 and the transparent electrode 4a of the Y electrode 4 are opposed to each other through the discharge gap 20, so that the discharge gap without the dielectric layer becomes dense, The electric field becomes stronger, the electric potential distribution is uniform and the electric fields are parallel, and the sustain discharge start voltage between the paired X electrode 3 and Y electrode 4 can be lowered.

  Once the discharge is started at a low sustain discharge voltage between the discharge gaps, the discharge spreads to the electrode surfaces of the wide facing portions 3ag, 4ag where the parallel electric field is generated, ionizes the discharge gas, and further travels through the transparent electrode. Therefore, even if the sustain discharge start voltage is low, the discharge does not go out and a stable discharge can be realized. Accordingly, power consumption can be reduced.

  Also, in this embodiment, unlike the above-mentioned Patent Document 1, there is no transparent intermediate layer, and the thickness of the dielectric layer 7 through which the light emitted from the phosphor passes (the thickness of the transparent rib in the portion with the transparent rib). (Thickness + thickness of the dielectric layer 7) is substantially the same as that of the prior art, and the transmittance of light from the phosphor does not drop compared to the prior art.

  In this embodiment, the groove 21 in the discharge gap 20 reaches the inner surface of the glass substrate 1. However, the present invention is not limited to this, and a transparent rib is formed between the glass substrate 1 and the bottom surface of the groove 21. It goes without saying that there may be a dielectric layer thinner than 2 thicknesses (heights). However, the height of the dielectric layer in the groove 21 is preferably ½ or less of the thickness (height) of the transparent rib 2 from the viewpoint of uniformity of potential distribution (parallel electric field).

  In the above description, the transparent electrodes 3a and 4a are formed so as to cover the transparent rib 2. However, the present invention is not limited to this, and the transparent electrodes 3a and 4a are formed up to the upper surface of the transparent rib 2 and not formed on the inclined surface 2a. May be. Even if it does in this way, the electric force line which comes out of the transparent electrode on the upper surface of the transparent rib 2 swells to the bottom surface side of the groove between the opposite electrode facing through the groove and is effectively used. On the first surface discharge side where the discharge expands from the groove, the thickness of the dielectric 7 is reduced by the height of the transparent rib 2, so that the lines of electric force are strengthened and effective. Conventionally, since the transparent electrode is formed on the glass substrate, the electric lines of force on the glass substrate side have not been effectively used. However, with the above configuration, the electric lines of force on the glass substrate side can be used, so that the sustain discharge start voltage can be reduced.

  Next, an AC type plasma display panel according to the second embodiment will be described below. FIG. 4 shows a second embodiment in which a part of the manufacturing process of the display substrate is changed. 4, parts having the same functions as those in FIGS. 1, 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted to avoid complexity.

  This embodiment has a thick transparent electrode on the discharge gap side of the paired X electrode and Y electrode, and has a groove in which a dielectric layer is not formed in a region substantially corresponding to the discharge gap. And

  In FIG. 4, the present embodiment differs from the first embodiment in the configuration of the X electrodes and Y electrodes that are row electrodes (sustain discharge electrodes). In this embodiment, the X electrode 5 and the Y electrode 6 which are a plurality of pairs of row electrodes provided on the glass substrate 1 of the display substrate are respectively transparent electrodes 5 a and 6 a provided on the glass substrate 1. The thick transparent electrodes 13x and 13y formed on the discharge electrode 20 side end of the bus electrode 5b, the bus electrode 6b, and the transparent electrodes 5a and 6a provided on the transparent electrode and facing each other through the discharge gap 20. It consists of. A transparent dielectric layer 7 having a groove 21 parallel to the row electrode is formed in a region substantially corresponding to the discharge gap 20 so as to cover the row electrode, and a protective film 8 is further provided thereon. Yes.

In the display substrate according to this embodiment, the transparent electrode 5a of the X electrode 5 and the transparent electrode 6a of the Y electrode 6 are simultaneously formed on the glass substrate 1, and then the X bus electrode 5b and the Y bus electrode 6b connected to the transparent electrode 5a are formed. To do. Thereafter, the transparent electrode 13 is provided at the end of the transparent electrode on the discharge gap side. The transparent electrode 13 is finished by printing and applying a transparent oxide semiconductor such as TiO ₂ , SnO ₂ , In ₂ O ₃ , ZnO or the like on the transparent electrodes 5 a, 6 a so as to have a predetermined thickness (height). The predetermined thickness of the transparent electrode 13 (including the thickness of the transparent electrodes 5a and 6a) is 2 μm or more, which is approximately twice the thickness of the transparent electrodes 5a and 6a, where t is the thickness of the dielectric layer. For example, 25 μm or less. The minimum thickness is preferably larger than the sum of the thicknesses of the transparent electrode 5a (6a) and the bus electrode 5b (6b) from the viewpoint of uniformity of potential distribution. If it is not finished to the specified thickness, print several times and finish to the specified thickness. The dielectric layer 7, the groove 21, and the protective film 8 are the same as those in the first embodiment, and a description thereof is omitted.

  Also in the present embodiment, similar to the first embodiment, thick transparent electrodes 13x and 13y are opposed to each other through the discharge gap 20, and there is no dielectric layer in the discharge gap 20 region. Since the grooves 21 are formed, the discharge gap without the dielectric layer becomes dense, the electric field becomes strong, the electric potential distribution is uniform and the electric fields are parallel, and the pair between the X electrode 5 and the Y electrode 6 is paired. The sustain discharge start voltage can be reduced. Also in this embodiment, a transparent intermediate layer is not required, and the transmittance of light from the phosphor does not drop compared to the conventional case.

  In the present embodiment, as in the first embodiment, the groove 21 in the discharge gap 20 reaches the inner surface of the glass substrate 1, but the present invention is not limited to this. It goes without saying that there may be a dielectric layer thinner than the thickness (height) of the transparent electrode 13 between the bottom surface. However, the height of the dielectric layer in the groove 21 is desirably ½ or less of the thickness (height) of the transparent electrode 13 from the viewpoint of uniformity of potential distribution (parallel electric field).

Sectional drawing which looked at the AC type plasma display panel of Example 1 from the row electrode side. The perspective view which looked at FIG. 1 in three dimensions. The figure which shows the mode of the electric force line | wire of the AC type plasma display panel of FIG. Sectional drawing which looked at the AC type plasma display panel of Example 2 from the row electrode side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass substrate, 2 Transparent rib, 3 X electrode, 4 Y electrode, 5 X electrode, 6 Y electrode, 7 Dielectric layer, 8 Protective film, 9 Phosphor, 10 Dielectric layer, 11 Address electrode, 12 Glass substrate, 13 transparent electrode, 14 barrier rib, 15 discharge space, 20 discharge gap, 21 groove, 30 lines of electric force.

Claims (6)

A first electrode and a second electrode disposed on an inner surface of a display surface side substrate of a pair of substrates opposed to each other through a discharge space, with a plurality of electrode pairs arranged with a discharge gap interposed therebetween; A plasma display panel comprising: a first electrode and a dielectric layer that covers the second electrode with respect to the discharge space;
A translucent rib formed at a predetermined thickness (height) in a region in the vicinity of both ends of the discharge gap between the first electrode and the second electrode forming a pair on the inner surface of the substrate on the display surface side And the pair of the first electrode and the second electrode are formed so as to cover the translucent rib, and the dielectric layer is a recess having no dielectric layer in a region corresponding to the discharge gap. Alternatively, a plasma display panel having a groove.   2. The plasma display panel according to claim 1, wherein a height of a bottom surface of the recess or groove from an inner surface of the display surface side substrate is at least equal to or less than a thickness (height) of the translucent rib. A first electrode and a second electrode disposed on an inner surface of a display surface side substrate of a pair of substrates opposed to each other through a discharge space, with a plurality of electrode pairs arranged with a discharge gap interposed therebetween; A plasma display panel comprising: a first electrode and a dielectric layer that covers the second electrode with respect to the discharge space;
The first electrode and the second electrode forming a pair include a translucent electrode portion having a predetermined thickness (height) at an end portion on the discharge gap side, and the dielectric layer is in a region corresponding to the discharge gap. A plasma display panel having a recess or groove having no dielectric layer.   4. The plasma display panel according to claim 3, wherein a height of the bottom surface of the concave portion or the groove from the inner surface of the display surface side substrate is at least equal to or less than a thickness (height) of the translucent electrode portion. .   The plasma display panel according to claim 3 or 4, wherein the electrode member of the translucent electrode is a transparent oxide semiconductor. The plasma display panel according to claim 5, wherein the transparent oxide semiconductor that is an electrode member of the translucent electrode is any one of TiO ₂ , SnO ₂ , In ₂ O ₃ , and ZnO.

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