JP2005071953A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel prevented from cross talk. <P>SOLUTION: The plasma display panel has a first substrate and a second substrate facing each other arranged so as to interpose a discharge space in between. A plurality of display electrodes and dielectric layers covering the display electrodes are formed on the first substrate, and a plurality of data electrodes crossing the display electrodes, dielectric layers covering the data electrodes, and ribs forming discharge cells by separating the discharge space are formed on the second substrate. The accumulation of wall electric charge generated at discharge cell side can be divided at every cells, an interference of electric charges between adjacent cell is prevented, and a stable discharge can be obtained by arranging dielectrics 21, forming areas having dielectric constant different from each other, on the dielectric layer 14 formed on the first substrate 11 so as to correspond with the discharge cells. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plasma display panel used for image display in computers and televisions.

  In this plasma display panel, ultraviolet rays are generated by gas discharge, and phosphors are excited by the ultraviolet rays to emit light to perform color display. And the display cell divided by the rib is provided on the board | substrate, and it has the structure by which the fluorescent substance layer is formed in this.

  This plasma display panel is roughly divided into AC type and DC type in terms of driving. Among AC types, there are two types of discharge types: surface discharge type and counter discharge type. In view of the simplicity of manufacturing and at present, the mainstream of plasma display panels is a three-electrode surface discharge type, which has a pair of display electrodes adjacent to each other in parallel on one substrate and the other. A data electrode arranged in a direction intersecting with the display electrode, a rib, and a phosphor layer are provided on the substrate, and the phosphor layer can be made relatively thick, which is suitable for color display using the phosphor.

  FIG. 5 shows a conventional AC surface discharge type plasma display panel. As shown in FIG. 5, a first substrate 1 on the transparent front side such as a glass substrate is used as a first electrode. A plurality of stripe-shaped display electrodes 2 paired with the scan electrodes and the sustain electrodes as the second electrodes are formed, and a dielectric layer 3 is formed so as to cover the electrode group. A protective film 4 is formed on the substrate.

  A plurality of rows of stripes covered with a dielectric layer 6 are formed on the second substrate 5 disposed opposite to the first substrate 1 on the front side so as to intersect the display electrodes 2 of the scan electrodes and the sustain electrodes. A data electrode 7 is formed as a third electrode. On the dielectric layer 6 between the data electrodes 7, a plurality of ribs 8 are arranged in parallel with the data electrodes 7, and a phosphor layer 9 is provided on the side surface between the ribs 8 and on the surface of the dielectric layer 6. Yes.

  The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space so that the display electrode 2 and the data electrode 7 of the scan electrode and the sustain electrode are almost orthogonal to each other, and the periphery is sealed, In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas. The discharge space is divided into a plurality of sections by ribs 8 to provide a plurality of discharge cells where the intersections of the display electrodes 2 and the data electrodes 7 are located, and each of the discharge cells has red, green and blue colors. The phosphor layers 9 are sequentially arranged one by one so that Thus, the discharge space is a space that is partitioned by the ribs on the second substrate and is sandwiched between the scan electrodes and the sustain electrodes of the first substrate.

  Next, a method of driving this panel will be described with reference to FIG. 6 showing an example of voltage waveforms applied to the scan electrodes, the sustain electrodes, and the data electrodes.

  In FIG. 6, first, an initialization pulse Vset is applied to the scan electrode to initialize the wall charges in the discharge cells of the panel, and the voltage applied to the discharge space between the scan electrode and the sustain electrode is close to the discharge start voltage. Wall charges are formed so as to be in a state. Next, a bias voltage Vscan is applied to the scan electrodes other than the cell to be selected, and the write voltage Vdata is applied to the data electrode at the same time as the bias voltage Vscan is removed from the selected cell to cause a write discharge. By this writing discharge, wall charges are accumulated on the surfaces of the dielectric layer, the protective film, and the phosphor layer. A similar writing operation is sequentially performed over the entire surface of the panel to select cells to be displayed.

  Next, in order to perform a sustain discharge, the data electrode is grounded, and the sustain pulse Vsus is alternately applied to the scan electrode and the sustain electrode, so that the potential on the surface of the protective layer becomes the discharge start voltage in the cell in which the wall charges are accumulated. The discharge occurs, and the main discharge of the display cell selected by the write pulse is maintained during the period in which the sustain pulse is applied (sustain period).

  Thereafter, the wall charges are erased and initialized by applying an erase pulse Verase, and thereafter, the subfield consisting of the following write period, sustain period, and erase period is repeated.

  Here, when the number of times of initialization is only one, there is little adverse effect on contrast due to weak discharge generated in initialization, but since wall charge is initialized only once, crosstalk is performed in the subsequent subfield. If this occurs, the subsequent writing operation or the like may not be performed normally. In this case, the normal gradation cannot be expressed, and the video deteriorates. Further, if the number of initializations is increased, video defects due to crosstalk are eliminated, but the number of weak discharges unrelated to the video increases due to initialization, and the contrast deteriorates.

  As a conventional plasma display panel, as shown in Patent Document 1, there is one in which a ferroelectric substance is disposed in a discharge cell. The structure of the dielectric layer of the plasma display panel described in Patent Document 1 is that the ferroelectric is polarized on at least one of the scan electrode, the sustain electrode, and the data electrode in the discharge cell. The emitted electrons at the time of reversal become a source of initial electrons that become a trigger when the discharge is started, so that the delay in discharge due to the initial electron deficiency is prevented, and the discharge delay during high-speed driving due to high definition It is possible to improve the lighting failure due to.

However, in such a dielectric structure, wall charges are formed at locations other than the discharge cells, and the cells in the row direction are connected by the wall charges. For this reason, crosstalk occurs due to the influence of the electric field of the wall charges formed outside the discharge cells.
Japanese Patent Laid-Open No. 2000-200553

  The present invention has been made in view of such a problem, and an object thereof is to prevent the occurrence of crosstalk.

  In order to solve such a problem, the present invention has a first substrate and a second substrate that are arranged to face each other with a discharge space interposed therebetween, and a plurality of display electrodes and a dielectric covering the display electrodes on the first substrate. And a plurality of data electrodes intersecting with the display electrodes, a dielectric layer covering the data electrodes, and a rib for partitioning the discharge space to form discharge cells. In the display panel, regions having different dielectric constants are formed in the dielectric layer on the first substrate so as to correspond to the discharge cells.

  The region having a different dielectric constant is a region having a relative dielectric constant of 10 or less and a dielectric constant lower than that of other portions, and is provided at a position facing the rib upper surface on the second substrate. Further, regions having different dielectric constants may be provided in the row direction and the column direction, and the widths of the regions may be different between the row direction and the column direction. The regions having different dielectric constants may be transparent materials or black materials. You may comprise.

  As described above, according to the present invention, crosstalk can be prevented, and high-definition display can be realized even when the cell pitch is narrowed.

  Hereinafter, a plasma display panel according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an AC surface discharge type plasma display panel according to an embodiment of the present invention, and FIG. 2 shows a dielectric structure of a first substrate.

  As shown in FIGS. 1 and 2, a scanning electrode 12 as a first electrode and a sustain electrode 13 as a second electrode are formed on a first substrate 11 on a transparent front side such as a glass substrate. A plurality of striped display electrodes are formed so as to be aligned in the row direction. The scan electrode 12 and the sustain electrode 13 are composed of transparent electrodes 12a and 13a and metal bus bars 12b and 13b such as silver electrically connected to the transparent electrodes 12a and 13a, respectively.

  A dielectric layer 14 is formed on the first substrate 11 on the front side so as to cover the plurality of pairs of electrodes. On the dielectric layer 14, a protective film 15 made of a material having high sputter resistance such as magnesium oxide (MgO) and a large secondary electron emission coefficient is formed. Further, the dielectric layer 14 on the first substrate is partitioned along the discharge space so as to intersect the display electrode by a dielectric 21 that forms a low dielectric constant region having a relative dielectric constant of 10 or less. .

  In addition, a plurality of layers covered with a dielectric layer 17 are arranged on the second substrate 16 facing the first substrate 11 on the front side in a column direction perpendicular to the display electrodes of the scan electrodes 12 and the sustain electrodes 13. Data electrodes 18 are arranged as stripe-like third electrodes. On the dielectric layer 17 between the data electrodes 18, a plurality of striped ribs 19 are arranged in parallel to the data electrodes 18, and the phosphor layer 20 is formed on the side surface between the ribs 19 and on the surface of the dielectric layer 17. Is provided.

  The first substrate 11 and the second substrate 16 are opposed to each other with a minute discharge space so that the scan electrode 12, the sustain electrode 13, and the data electrode 18 intersect substantially orthogonally, and the first substrate 11 and the second substrate 16 are opposed to each other. A low-dielectric-constant dielectric 21 that partitions the dielectric layer 14 of the first substrate 11 is disposed so as to face the upper surface of the rib 19 on the second substrate 16. The periphery is sealed, and one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas in the discharge space. Further, the discharge space is divided into a plurality of sections by ribs 19 so that a discharge cell is provided at each of a plurality of intersections of the display electrode and the data electrode 18, and each of the discharge cells has red, green and blue colors. Thus, the phosphor layers 20 are sequentially arranged for each color, and the pixel X-1 made of RGB is formed by three discharge cells as shown by the dotted lines in FIG.

  This panel is configured to view an image display from the first substrate 11 side, which is the display surface side, and excites the phosphor layer 20 by ultraviolet rays generated by discharge in the discharge space, and displays generated visible light. It is used for light emission.

  FIG. 3 is a diagram showing a dielectric configuration of a plasma display panel according to another embodiment of the present invention. In the present embodiment, the low dielectric constant dielectric material 21 that partitions the first substrate is provided in the row direction and the column direction to limit the formation of wall charges other than in the horizontal and vertical discharge spaces. The wall charge can be formed for each discharge cell. In addition, a structure partitioned in at least one of the row direction and the column direction, a structure in which the dielectric constant of the dielectric in the column direction is higher than the dielectric constant of the dielectric 21 in the row direction, or the opposite structure, You may implement combining these. Furthermore, the dielectrics 21 having different dielectric constants may have different widths in the row direction and the column direction.

  The plasma display panel configured as described above has a configuration in which regions having different dielectric constants are formed in the dielectric layer 14 so as to correspond to the discharge cells, and wall charges formed on the display electrode side are different for each discharge cell. The wall charges are not formed outside the discharge space, or can be very small. Therefore, unlike the conventional panel structure, there is no influence of the electric field due to the wall charges formed outside the discharge space, so that the movement of charged particles due to discharge leakage from the discharge cell to the adjacent cell can be prevented.

  As shown in FIG. 4, in the plasma display panel, the charge particles 22 leak from the discharge cell to the adjacent cell through a slight gap between the rib and the first substrate, and a crosstalk phenomenon occurs that cancels the wall charge of the adjacent cell. . In a cell with reduced wall charge, problems such as non-lighting are likely to occur. Therefore, it is necessary to increase the write pulse Vdata to the data electrode or increase the number of initializations. In addition, for high definition, it is necessary to use a narrow cell pitch, and since the interval between adjacent cells becomes narrow, crosstalk also increases.

  In the present invention, since there is no influence of an electric field due to wall charges formed outside the discharge space, the movement of charged particles due to discharge leakage from the discharge cell to the adjacent cell can be prevented, and crosstalk between adjacent cells can be prevented. In addition, even when the cell pitch is narrowed to increase the definition of the panel, crosstalk can be prevented. In addition, since extra wall charges are not formed outside the discharge space, power consumption during charging and discharging can be reduced.

  Furthermore, in the present invention, the region where the wall charges are not formed can be arbitrarily adjusted by adjusting the width of the low dielectric constant dielectric material 21 that defines the dielectric layer 14 and the position with respect to the discharge cell.

  Further, in the plasma display panel of the present invention, the low dielectric constant dielectric 21 is made of a material containing a black substance, and has a blackish color, so that a light-shielding body disposed between the discharge cells, so-called black It can also serve as a stripe, and it is possible to improve contrast in a bright place while preventing crosstalk during writing or sustain discharge. On the other hand, if the dielectric 21 having a low dielectric constant is made of a transparent material, it is not shielded from light even when formed on the discharge space side.

  As described above, in the present invention, the accumulation of wall charges formed on the display electrode side is partitioned for each cell by providing a low dielectric constant region corresponding to the discharge cell in the dielectric on the first substrate. In addition, since wall charges are not formed outside the discharge space or can be very small, the movement of charge particles due to discharge leakage from the discharge cells to the adjacent cells can be prevented. Crosstalk can be prevented, power consumption during charging and discharging can be reduced, and crosstalk can be prevented even when the cell pitch is narrowed to increase the definition of the panel.

  According to the present invention, crosstalk in the plasma display panel can be prevented, and the invention is useful in a configuration in which the cell pitch is narrowed for high-definition display.

The perspective view which shows the structure of the plasma display panel by one embodiment of this invention. The top view which shows the dielectric material structure of the 1st board | substrate of the panel The top view which shows the dielectric material structure of the plasma display panel by other embodiment of this invention. Explanatory diagram for explaining crosstalk Perspective view showing the structure of a general plasma display panel Signal waveform diagram showing the drive voltage waveform of a typical plasma display panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 1st board | substrate 12 Scan electrode 13 Sustain electrode 14 Dielectric layer 15 Protective film 16 2nd board | substrate 17 Dielectric layer 18 Data electrode 19 Rib 20 Phosphor layer 21 Dielectric

Claims (7)

A plurality of display electrodes and a dielectric layer covering the display electrodes are formed on the first substrate; and the second substrate is provided with the dielectric layer covering the display electrodes. A plasma display panel having a plurality of data electrodes intersecting with a display electrode, a dielectric layer covering the data electrodes, and a rib for partitioning the discharge space to form a discharge cell, wherein the dielectric layer on the first substrate In addition, a region having a different dielectric constant is formed corresponding to the discharge cell. 2. The plasma display panel according to claim 1, wherein the regions having different dielectric constants are provided at positions facing the upper surface of the rib on the second substrate. 2. The plasma display panel according to claim 1, wherein the regions having different dielectric constants are regions having a lower dielectric constant than other portions. 2. The plasma display panel according to claim 1, wherein regions having different dielectric constants are provided in the row direction and the column direction, and the widths of the regions are different in the row direction and the column direction. 2. The plasma display panel according to claim 1, wherein regions having different dielectric constants are transparent. 2. The plasma display panel according to claim 1, wherein regions having different dielectric constants are black. 2. The plasma display panel according to claim 1, wherein regions having different dielectric constants have a relative dielectric constant of 10 or less.

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