JP2009231119A - Planar discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of displaying two kinds of information in a light-on state, respectively, with a small installation space, of reduced cost, and hardly failing. <P>SOLUTION: In the planar discharge lamp, a first electrode 24 and a second electrode 26 on which high voltage is impressed are provided so as to pass only an emission zone 20 belonging to either of a first emission zone group and a second emission zone group being lighted by the respective electrodes, and at the same time, a common electrode 28 meandering between the first electrode 24 and the second electrode 26 so as to pass all the emission zones 20, so that, when light is emitted from the emission zone 20 of the first emission zone group, only the second electrode 26 to be in a floating state and the common electrode of a GND level exist. Thus, it is suitably restrained that discharge takes place in the emission zone 20 of the second emission zone group and thereby leak emission occurs. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flat discharge lamp capable of light emission display by switching between two display patterns.

  In various indoor and outdoor facilities / equipment, for example, information is displayed by switching a plurality of display patterns of about 2 to 4 types. In general, display devices that emit a display pattern for the purpose of enhancing visibility are widely used. Examples of such a display device include those shown in the following A to D.

A. What displays different information depending on the lighting state and the light-off state In this type of display device, a display pattern to be displayed during lighting is formed on a light-transmitting glass plate or resin plate, and the display plate is a fluorescent lamp A light-emitting body such as a light bulb or the like is mounted on the front of a box-shaped lamp equipped inside. In the lit state, the display pattern is illuminated from the inside to indicate that the display pattern is displayed, and in the unlit state, the display pattern is darkened to indicate that it is not in that state. For example, it is used for displaying “ON AIR” in a studio or the like, and “in operation” in an operating room.

B. A display device of the above-mentioned two A that are arranged side by side and integrated In this type of display device, one of the two arranged side-by-side is turned off while the other is turned off. indicate. For example, it is used for displaying “full vehicle | empty vehicle” in a parking lot.

C. A display device that switches and displays a plurality of display patterns formed on a curtain This type of display device, for example, forms a plurality of types of display patterns side by side on a curtain, arranges them on the front of a lamp, and displays the curtain in one direction The display pattern is changed by winding in the opposite direction. For example, it is used for switching the display of “reserved seats / designated seats” on a railway vehicle, displaying advertisements of stations, department stores, etc. in sequence.

D. A display device using a full dot display This type of display device emits and displays light according to an input data signal from a large number of dots arranged vertically and horizontally in a rectangular shape. A plurality of input data is prepared and switched manually or automatically. The displayed information is changed. For example, in railway vehicles, it is used when displaying “Express”, “Express”, and “Normal” using LEDs or the like.
JP 2006-147251 A

  However, in the display device A, it is difficult to determine whether or not the display device is in the display state when the display device is turned off. The display device B improves this inconvenience. However, since a space that is a multiple of the number of display patterns with respect to the space required for one display is required for installation of the device, the space utilization efficiency is increased. There is a bad problem. In addition, the C display device has a problem that the device is a large-scale machine and has a problem that the machine part is likely to fail. Further, since the display device D displays only a limited display pattern even though it is configured to be capable of various displays, the display pattern is likely to burn-in. In addition, since a complicated structure and a driving circuit are required to enable various displays, the apparatus becomes expensive, and there is a problem that it is expensive as compared with a simple usage mode.

  The present invention has been made in the background of the above circumstances, and its purpose is to provide a display device that can display both types of information in a lit state, has a small installation space, is inexpensive, and does not easily cause a failure. It is to provide.

  In order to achieve such an object, the gist of the present invention includes a translucent surface plate and a back plate that forms a flat airtight space between the surface plate and the airtight space. A flat discharge lamp of a type that emits light generated by being discharged through the surface plate, and (a) a partition wall protruding on the back plate to divide the hermetic space into a plurality of light emitting sections (B) a phosphor layer provided in each of the plurality of light emitting sections; and (c) a distribution range of the plurality of light emitting sections belonging to each of the plurality of light emitting sections without overlapping. A first light-emitting section group and a second light-emitting section group for forming different display patterns each composed of a plurality of light-emitting sections defined to overlap each other; and (d) the first light-emitting section among the plurality of light-emitting sections. Through each belonging to a parcel group A first electrode provided on the inner surface of the back plate; and (e) an insulating material provided on the inner surface of the back plate through each of the light emitting sections belonging to the second light emitting section group. A second electrode, and (f) a common electrode provided on the inner surface of the back plate through each of the plurality of light emitting sections and for alternatively discharging between the first electrode and the second electrode And (g) a dielectric layer covering the first electrode, the second electrode, and the common electrode.

  In this way, in a flat discharge lamp having a flat airtight space between the front plate and the back plate and emitting light from the airtight space, a plurality of light emitting elements each provided with a phosphor layer in the airtight space are provided. Two display patterns that are different from each other are formed by two light emitting section groups that are divided into partitions by partition walls and that are each configured by a plurality of light emitting sections. At this time, since the first electrode and the second electrode passing through the light emitting sections of the first light emitting section group and the second light emitting section group are insulated from each other, a voltage is applied between one of them and the common electrode. Thus, two different display patterns can be selectively displayed. Each of the plurality of light-emitting sections belongs to only one of the first light-emitting section group and the second light-emitting section group, and does not overlap. Therefore, the light-emitting section group that emits light without requiring complicated wiring or a control circuit is provided. You can choose. In addition, since the two light emitting section groups are determined so that the distribution ranges of the light emitting sections belonging to each other overlap each other, the two light emitting section groups are not in a positional relationship completely separated from each other in the surface direction of the surface plate. Each can be displayed in a wide range according to the degree of overlap, for example, using the entire surface plate. Therefore, since both types of information are displayed in the lighting state, the two types of information are formed by dividing the light-emitting section within one display surface. Two types of display patterns can be obtained. In addition, since a mechanical drive portion is unnecessary, a failure due to the mechanical drive portion can be avoided and the structure and the drive circuit can be simplified, so that an inexpensive device can be obtained. In addition, since all the light-emitting sections can be configured to light up with any display pattern, display image burn-in as in the case of displaying only a limited display pattern on a full dot display does not occur.

  In addition, since the first electrode, the second electrode, and the common electrode are all provided on the back plate, the surface discharge is caused, so that the aperture ratio is lowered by the electrodes arranged on the front plate, and the luminance is thus increased. Is suppressed from decreasing. Further, there is no non-lighting or leakage light emission due to the positional deviation between the front plate and the rear plate in the manufacturing process. Incidentally, as an electrode configuration of the flat discharge lamp, it is possible to adopt a counter discharge structure in which discharge is performed between electrodes arranged opposite to each other on the front plate and the back plate. There is a problem that the brightness is reduced by being shielded by light, and the electrodes on the front plate and the electrodes on the back plate may be misaligned during assembly.

  In addition, since the discharge is performed between one of the first electrode and the second electrode and the common electrode, the light emitting section to be turned off includes one of an electrode to which a high voltage is applied or a grounded electrode, a power supply circuit, and It is possible to adopt a driving method in which only the floating electrode that is disconnected is present. For this reason, leakage light emission is suitably suppressed.

  In the present invention, “the distribution ranges overlap each other” means that a light emitting section belonging to the second light emitting section group exists between the light emitting sections belonging to the first light emitting section group. As a result, a light emitting section for forming the other display pattern exists in the range where each of the two display patterns is formed. Therefore, in each display pattern, a non-light-emitting portion is generated by such a light-emitting section. Therefore, a portion that must emit light in order to represent an original shape such as a character or a figure to be displayed is in a non-light-emitting state. Can be. For example, the line to be continuous may be interrupted or intermittent, or a blank may be generated in the fill pattern. However, even if such intermittent or blank portions exist, if the amount of light generated from the neighboring light emitting sections is sufficiently large, the non-light emitting portions are not noticeable and display quality is not substantially reduced. Further, even if the non-light emitting portion is conspicuous, the observer recognizes the display pattern by complementing the non-light emitting portion unconsciously. Therefore, in any case, since information to be displayed is sufficiently transmitted, it is not a problem that there is a non-lighting light emitting section for configuring another display pattern in the display pattern. .

  That is, according to the present invention, for example, a flat discharge lamp (see, for example, Patent Document 1) used for a backlight, an illumination lamp, general illumination, and the like is used, and the discharge space is divided into a plurality of parts, thereby intermittently. A display pattern that can be visually recognized as a whole can be configured in a simple light-emitting section. Since such a flat discharge lamp is applied, the display device of the present invention has an advantage that the thickness dimension is as thin as that of a conventional full dot display.

  Note that “the distribution ranges overlap each other” includes a case where the distribution ranges of the light emission sections belonging to each of the first light emission section group and the second light emission section group overlap completely with each other and partially overlap. For example, if the two display patterns include a shape that is preferable in terms of display quality so that no light is emitted from a part of the entire display surface, a partially overlapping state is preferable. For example, one display pattern is displayed around the left portion of the entire display surface, and the other is the right portion, depending on the positional relationship with the equipment provided around the portion where the flat discharge lamp of the present invention is disposed. It is conceivable that the display centering on the screen is suitable for the purpose of the display.

  The phosphor layer is preferably provided in all the light emitting sections, but is not essential. For example, it does not preclude that a light emitting section that uses light generated by gas discharge of neon, sodium or mercury lamp as it is for display is included. Further, the emission color and coating pattern of the phosphor layer provided in each light emitting section are determined according to the display pattern to be formed. For example, a phosphor that emits light of one color may be applied to the entire light emitting section, but phosphors of a plurality of colors may be separately applied in one light emitting section.

  Here, it is preferable that the first electrode and the second electrode each have a comb shape and are fitted to each other at their tooth portions, and the common electrode is between the first electrode and the second electrode. It meanders. In this way, since the common electrode is provided by sewing between the comb-shaped first electrode and the second electrode, three electrodes and a takeout terminal are sufficient as a whole.

  Preferably, the partition wall has a lattice shape, and the plurality of light emitting sections are located adjacent to each other that belong to the first light emitting section group and those belonging to the second light emitting section group. Is. In this way, since the light emitting sections belonging to each of the two light emitting section groups are provided in a checkered pattern, a flat discharge lamp with excellent visibility can be obtained.

  Preferably, in each of the plurality of light emitting sections, one of the common electrode, the first electrode, and the second electrode passes through a central portion and the other passes through a corner portion, The area of the electrode that passes is equal to or more than 1.5 times the area of the electrode that passes through the center. If the area of the electrode located in the center is larger than that located in the corner, leakage light is likely to occur, and if the area of the electrode located in the corner is 1.5 times larger than that located in the center, the insulation The withstand voltage is lowered. When one of the electrodes is provided so as to pass through a plurality of locations in one light emitting section, for example, the first electrode and the second electrode pass through the central portion, and the common electrode is on the side of the electrode. In a configuration that passes through two corners, the area of one electrode that passes through a plurality of locations is the total value of the plurality of locations. The “same or more and less than 1.5 times” includes an electrode whose area passing through the corner is slightly smaller than that of the electrode passing through the central part but can be said to be substantially the same.

  Preferably, the first electrode and the second electrode pass through a central portion of each of the plurality of light emitting sections, and the common electrode passes through a peripheral portion of each of the plurality of light emitting sections. is there. In this way, since the first electrode and the second electrode that are electrically insulated from each other pass through the position farthest from the light emitting section through which the other electrode passes, leaked light emission is further suppressed.

  Preferably, in the first electrode and the second electrode, a width dimension in each of the plurality of light emitting sections is made larger than a width dimension at an intersection of the partition walls. In this case, the width of the first electrode and the second electrode at the intersection of the partition walls is made relatively narrow relative to the inside of the light emitting section, so that the portion located at the intersection of the partition walls and the common electrode It is further suppressed that leakage light emission occurs due to discharge.

  Preferably, the common electrode is partially located below the intersection of the partition walls. In this way, since a part of the common electrode is located under the intersection of the partition walls, a discharge between the first electrode and the second electrode located under the intersection occurs in the light emitting section and leaks. Occurrence of light emission is further suppressed.

  Preferably, the partition wall covers a part of the common electrode by extending an intersection to an inner peripheral side of each of the plurality of light emitting sections. In this way, since the distance from one of the first electrode and the second electrode located below the intersection of the partition walls to the inner wall surface of the light emitting section to be turned off is increased, wall charges are formed on the inner wall surface. As a result, leakage light emission is further suppressed.

  Note that the shape of each of the plurality of light emitting sections is appropriately determined according to a desired display pattern. For example, in addition to a dot shape such as a circle, a rectangle, and a triangle, it can be configured in a stripe shape, or can be configured in an appropriate graphic pattern.

  In the case where each of the plurality of light emitting sections has a stripe shape, the electrode is preferably provided along the longitudinal direction of the stripe shape. In this way, it becomes easy to form the light-emitting sections and to separately coat the phosphor layers, so that the display device can be manufactured at a lower cost. Further, when the light emitting sections are separated from each other by the partition walls, the electrode can be configured not to straddle the partition walls.

  In addition, the airtight space is not limited to a flat surface plate side and a back plate side as long as the flat space can constitute a flat discharge lamp. For example, what has an unevenness | corrugation in the inner surface of a backplate or a surface board for the purpose of light scattering etc. is also contained in the "flat airtight space" said to a claim.

  In addition, the front plate and the back plate for forming the airtight space are made of, for example, a glass material, but when the light is not emitted from the back plate side, the back plate does not need to have translucency, It can also be made of an opaque material such as ceramics or a bag.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a diagram schematically showing a cross-section for explaining the configuration of an example of a flat discharge lamp 10 of the present invention. The flat discharge lamp 10 is classified, for example, as a cold cathode tube in which xenon gas is used as a discharge gas, does not contain harmful mercury, and has a response that rises on the order of msec at all temperatures. .

  In FIG. 1, the flat discharge lamp 10 is formed in a thin flat box shape as a whole by arranging a back plate 12 and a front plate 14 parallel to each other with a slight gap therebetween. The back plate 12 and the front plate 14 are made of soda-lime glass plates each having a size of about 150 × 200 (mm), for example, and the thickness of the back plate 12 is 1.1 (mm). The thickness dimension of the surface plate 14 is about 0.7 (mm). These are fixed airtightly to each other via a side wall 16 made of, for example, soda lime glass provided substantially in a rectangle along the peripheral edge portion, and a rectangular airtight space 18 is formed between them. In this airtight space 18, xenon or a mixed gas containing xenon as a main component (for example, xenon 90 (%), argon 10 (%)) is at a pressure of about 40 (kPa) (≈300 (Torr)), for example. It is enclosed. The gas pressure of the sealed gas, that is, the discharge gas, is determined so that a substantially uniform discharge is generated over the entire surface of the hermetic space 18. For this reason, in the airtight space 18, for example, the distance between the back plate 12 and the front plate 14, that is, the height dimension of the airtight space 18 is kept constant, and the airtight space 18 is divided into a plurality of light emitting sections 20. A grid-like partition wall 22 is provided.

  On the inner surface of the back plate 12 (one surface on the airtight space 18 side), as shown in plan view in FIG. 2, a comb-shaped first electrode 24 and second electrode 26, and a meandering common electrode 28 are formed. And are provided. Each of the first electrode 24 and the second electrode 26 has a plurality of branch electrode portions 30 parallel to each other on a comb-shaped tooth portion, and the plurality of branch electrode portions 30 are electrically insulated from each other. It is fitted. The common electrode 28 is provided so as to sew between the multiple branch electrode portions 30 while being electrically insulated from both the first electrode 24 and the second electrode 26. The first electrode 24 and the second electrode 26 have a width of about 220 (μm), for example, and are patterned by etching after vapor deposition of thick film silver or aluminum formed by using a thick film screen printing method. It consists of formed thin film aluminum or the like. The common electrode 28 has a width dimension of about 300 (μm), for example, and is made of the same material as the first electrode 24 and the second electrode 26. The first electrode 24, the second electrode 26, and the common electrode 28 are covered with, for example, a white dielectric layer 32. The dielectric layer 32 is made of, for example, low melting point glass and a filler such as alumina or titania, and is provided with a thickness of about 30 to 100 (μm), for example, about 50 (μm).

  2 are provided with terminal portions 34, 36, and 38 for connection to an external circuit, and the first electrode 24, the second electrode 26, and the common electrode 28 are connected to the terminals. Are connected to the sections 34, 36, and 38, respectively. In FIG. 2, the dielectric layer 32 and the like are omitted, and the arrangement of the electrodes 22 and the like is shown, and the position of the partition 22 is indicated by a broken line. FIG. 1 corresponds to a cross section taken along line II in FIG.

  FIG. 3 is a diagram showing a positional relationship between the partition wall 22 and the electrodes 24, 26 and 28 by enlarging a part of the light emitting section 20. Each of the first electrode 24 and the second electrode 26 is provided along a direction inclined by 45 degrees with respect to the lattice of the partition wall 22, and both are located on a diagonal line of the rectangular light emitting section 20. That is, it passes through the central part and two corners of a large number of light emitting sections 20 that are inclined by 45 degrees with respect to the lattice and arranged in an oblique direction. On the other hand, the common electrode 28 is positioned on both sides of the first electrode 24 and the second electrode 26 in each light emitting section 20, and the light emitting section through which the second electrode 26 passes, the corner of the light emitting section 20 through which the first electrode 24 passes. The light emitting sections 20 are formed so as to alternately pass through the 20 corners, that is, sequentially pass through the light emitting sections 20 adjacent to each other.

  Therefore, the plurality of light emitting sections 20 are alternately arranged such that the first electrode 24 passes through the central portion and the second electrode 26 passes through the central portion in both the vertical and horizontal directions in FIG. . In the present embodiment, the light emitting section 20 through which the first electrode 24 passes belongs to the first light emitting section group, and the light emitting section 20 through which the second electrode 26 passes belongs to the second light emitting section group. Therefore, in this embodiment, the range in which the light emitting sections 20 belonging to the first light emitting section group are distributed and the range in which the light emitting sections 20 belonging to the second light emitting section group are distributed overlap each other. The section 20 belongs to only one of them, and none of them belongs to both.

  Each of the plurality of light emitting sections 20 is different in whether the electrode passing through the central portion is the first electrode 24 or the second electrode 26, but all have the same electrode arrangement state. As illustrated for the light emitting section 20 at the lower right in FIG. 3, each light emitting section 20 has a first electrode 24 or a second electrode 26 at one central portion and a common electrode 28 at two corner portions. Although provided, the areas Sh and Sg of the portions located in the light emitting section 20 have a relationship in which the electrode area Sh passing through the central portion is substantially equal to the electrode area 2Sg passing through the corner.

  The partition wall 22 is a porous body made of, for example, a material in which a white filler or the like is appropriately added to low-melting glass, and the like, for example, in a range of about 0.1 to 1.2 (mm), for example, 200 ( It has a height dimension of about (μm) and a width dimension of about 0.1 to 2 (mm), for example, a width dimension of about 300 (μm), for example within a range of about 0.5 to 10 (mm), for example 1.2 (mm) It is provided at a center distance of about.

  In addition, a phosphor layer 44 is provided between the barrier ribs 22 on the surface of the dielectric layer 32 and is separately applied with a predetermined pattern for each light emitting section 20. The coating thickness of the phosphor layer 44 is, for example, in the range of 20 to 100 (μm), for example, about 70 (μm). In FIG. 1, the phosphor layer 44 is provided only on the inner surface of the back plate 12, but the phosphor layer may also be formed on the inner surface of the surface plate 14. When it is provided on the surface plate side, the film thickness is preferably in the range of 5 to 20 (μm) so as not to hinder light emission. The display patterns to be displayed respectively in the first light emitting section group and the second light emitting section group are formed, for example, by changing the hue by separately applying the phosphor layer 40, and are supplementarily fluorescent to the light emitting section 20 that is desired to be turned off. Black is expressed by not providing the body layer 40.

  For example, as shown in FIG. 4, the flat discharge lamp 10 configured as described above uses, for example, a high-frequency inverter circuit 42 or the like and applies, for example, 700 (V), 20 ( A high frequency sine wave or pulse of about kHz) is applied, and the common electrode 28 is driven with 0 (V) (that is, GND). In FIG. 4, a switch 44 is provided between the inverter 46 and the first electrode 24 and the second electrode 26, and the high voltage side of the inverter 42 and the first electrode 24 and the second electrode 26 are selected. Connected unilaterally. While one is connected to the high voltage side, the other is left floating. As a result, since a driving voltage is applied between one of the first electrode 24 and the second electrode 26 and the common electrode 28, a discharge is generated between them, and the phosphor layer is generated by ultraviolet rays generated thereby. 40 is caused to emit light. Note that the frequency and voltage of the drive current, the pulse width in the case of a pulse, and the like are appropriately set according to the size of the flat discharge lamp 10, the enclosed gas pressure, and the like.

  That is, according to the present embodiment, the first electrode 24 and the second electrode 26 to which a high voltage is applied pass through only the light emitting section 20 belonging to one of the first light emitting section group or the second light emitting section group. And the common electrode 28 meandering between the first electrode 24 and the second electrode 26 is provided so as to pass through all the light emitting sections 20, so that the light emission of the first light emitting section group When light is emitted from the section 20, the light emitting section 20 of the second light emitting section group includes only the floating second electrode 26 and the common electrode 28 at the GND level. Therefore, it is possible to suitably suppress the occurrence of discharge in the light emitting section 20 of the second light emitting section group and the occurrence of leaked light emission.

  Therefore, according to the present embodiment, the high voltage side electrode is divided into two systems of the first electrode 24 and the second electrode 26, and the voltage applied from the inverter 42 is simply switched using the switch 44. There is an advantage that two types of display patterns can be displayed with a display surface size in which only one type of conventional display pattern is displayed.

  In the present embodiment, since the areas of the electrodes 24, 26, and 28 located in the light emitting sections 20 are in the relationship of Sh≈2Sg as described above, leakage light emission is further suppressed and sufficient. High dielectric strength can be obtained.

  Next, another embodiment of the present invention will be described. In the following embodiments, parts common to the above-described embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a view corresponding to FIG. 3 for explaining the positional relationship between the partition wall 46 of the flat discharge lamp in which the light emitting section 48 is formed by partition walls 46 having different shapes and the electrodes 28, 50, 52.

  In FIG. 5, the partition wall 46 has the same grid width and pitch as the partition wall 22, but the intersection of the grids is enlarged to the inner peripheral side of the light emitting section 48. The portion is chamfered to form an octagon in plan view. The size of the chamfered portion is determined so that the mutual interval C between the light emitting sections 48 and 48 arranged in the oblique direction is 700 (μm).

  Also in this embodiment, electrodes are provided on the back plate 12 with the same planar shape as that shown in FIG. 2, but the first electrode 50 and the second electrode 52 have their branch electrode portions. In the longitudinal direction, a thick portion and a narrow portion are periodically provided. That is, the light emitting section 48 is provided with a width dimension A of about 220 (μm), for example, and the intersection portion of the lattice of the partition wall 46 is provided with a width dimension B of about 120 (μm), for example. The common electrode 28 has the same configuration as that shown in FIG.

A DD cross section and an EE cross section in FIG. 5 are shown in FIGS. 6 and 7, respectively. In FIGS. 6 and 7, the phosphor layer 40 is not shown. Focusing on the second electrode 52a, in the light emission zone within 48 shown in FIG. 6, since the width dimension of the second electrode 52a is as large as A = 220 (μm) degree, the discharge gap g ₁ between the common electrode 28 views The size is about 170 (μm) which is the same as the embodiment shown in 3 etc., and there is no change in the discharge conditions between them. Since the charge Q ₁ is accumulated on the second electrode 52 a in the light emitting section 48, the distance d ₁ to the charge formation position is equal to the thickness dimension of the dielectric layer 32, for example, about 50 (μm). It is.

On the other hand, as shown in FIG. 7, when the second electrode 52a is considered in a section E where the second electrode 52a is located below the partition wall 46, the width dimension of the second electrode 52a is about B = 120 (μm), that is, the case shown in FIG. Since it is about 100 (μm) small, the discharge gap g ₂ between the second electrode 52a and the common electrode 28 is expanded to about 220 (μm). Therefore, it becomes difficult to generate the discharge between these. In addition, the charge Q ₂ accumulates in the light emitting section 48 through which the first electrode 50 passes, but at the base portion of the partition wall 46 located closest to the second electrode 52a, but from the second electrode 52a to the charge formation position. The distance d ₂ is as large as about 294 (μm), for example.

As described above, the distance d to the charge forming position is remarkably different by, for example, about 6 times between the inside of the light emitting section 48 and the intersection of the partition wall 46, and the electrode area is also larger in the light emitting section 48. The capacitance determined by the dielectric constant, the electrode area, and the distance d of the dielectric layer 32 differs by 6 times or more between the case shown in FIG. 6 and the case shown in FIG. Therefore, in the above configuration, when a high voltage is applied to the second electrode 52 and the first electrode 50 is set in a floating state, the charge Q ₂ accumulated in the light emitting section 48 to be extinguished becomes extremely small. Combined with the fact that most of the lines of electric force are formed in the dielectric layer 32, it is difficult for discharge to occur in the light emitting section 48 to be extinguished. That is, leakage light emission is further suppressed as compared with the case shown in FIG.

Incidentally, in the configuration example shown in FIG. 3, in the configuration in which the first electrode 50 and the second electrode 52 are provided instead of the first electrode 24 and the second electrode 26 having a uniform width dimension, d in FIG. _The dimension corresponding to ₂ is about 142 (μm), but under these conditions, for example, the total lighting start voltage is about 600 (V), the leakage start voltage is about 752 (V), and the operation margin is about 152 (V) It is. On the other hand, although the conditions are slightly different from the above, in the test result where d ₂ is about 294 (μm), the total lighting start voltage is about 613 (V) and the leakage start voltage is about 876 (V). The operating margin has been expanded to 263 (V). That is, by using the partition wall 46 in which the intersection of the lattices is enlarged to the light emitting section 48 side, it is possible to further increase the operation margin and obtain a flat discharge lamp in which leakage light emission is less likely to occur.

  In addition, as described above, by providing the narrow portion B in the first electrode 50 and the second electrode 52, the capacitance of the entire tube is reduced. Therefore, there is also an advantage that the conditions of the usable inverter can be relaxed.

Further, according to the above configuration, since the intersection portion of the partition wall 46 has a narrow width, the size of the d ₂ can be kept sufficiently large even if the printing position shift occurs, so that the alignment at the time of manufacturing is performed. There is also an advantage that the margin is expanded.

  In FIGS. 6 and 7, reference numeral 54 denotes a black layer provided between the light emitting sections 48, that is, on the partition wall 46. The black layer 54 is formed using, for example, a glass paste in which an appropriate black pigment is added to the glass material constituting the dielectric layer 32, the partition wall 46, and the like.

  In the above-described embodiment, the common electrode 28 is set to the GND side and driven. However, the common electrode 28 can be set to the high voltage side and driven.

  In the driving method described above, when a high voltage is applied to the first electrode 24, the second electrode 26 is set in a floating state, but can be driven as GND. Further, as shown in FIG. 8, sine waves whose phases are different from each other by 180 degrees are constantly applied to the first electrode 24 and the second electrode 26, and the common electrode 28 is applied to the first electrode 24 and the second electrode 26, respectively. It is also possible to drive by selectively applying two types of sine waves having the same phase. In this way, as shown in the pattern A, when the applied pulses have the same phase between the common electrode 28 and the second electrode 26, a discharge is caused between the common electrode 28 and the first electrode 24 and the first electrode 24 is discharged. When one light emitting section group is lit and displayed and the common electrode 28 and the first electrode 24 coincide as shown in the pattern B, the second light emitting section is discharged by discharging between the common electrode 28 and the second electrode 26. Since the group is displayed with light emission, the display can be switched by the phase inversion of the pulse applied to the common electrode 28.

  As mentioned above, although this invention was demonstrated in detail with reference to drawings, this invention can be implemented also in another aspect, A various change can be added in the range which does not deviate from the main point.

It is a figure which shows typically the cross-sectional structure of an example of the flat discharge lamp of this invention. It is a figure which shows the electrode arrangement | positioning shape of the flat discharge lamp of FIG. It is a figure explaining the positional relationship of a partition and an electrode by enlarging a light emission division. It is a figure explaining the lighting method of the flat discharge lamp of FIG. It is a figure corresponding to FIG. 3 for demonstrating the positional relationship of the partition and electrode in the flat discharge lamp of the other Example of this invention. It is a figure which shows the DD sectional view in FIG. It is a figure which shows the EE view cross section in FIG. It is a drive waveform diagram for demonstrating the other example of the lighting method of the flat discharge lamp of FIG.

Explanation of symbols

10: Flat discharge lamp, 12: Back plate, 14: Front plate, 16: Side wall, 18: Airtight space, 20: Light-emitting section, 22: Partition, 24: First electrode, 26: Second electrode, 28: Common electrode 32: Dielectric layer, 40: Phosphor layer

Claims (8)

A surface plate having translucency and a back plate that forms a flat airtight space between the surface plate and emitting light generated by discharging in the airtight space through the surface plate. A flat discharge lamp,
A partition wall protruding on the back plate to divide the airtight space into a plurality of light emitting sections;
A phosphor layer provided in each of the plurality of light emitting sections;
Each of the plurality of light emitting sections is configured to form a different display pattern including a plurality of light emitting sections that are determined so that each of the plurality of light emitting sections does not overlap and the distribution ranges of the plurality of light emitting sections belonging to each of the plurality of light emitting sections overlap each other. One light emitting section group and a second light emitting section group;
A first electrode provided on the inner surface of the back plate through each of the plurality of light emitting sections belonging to the first light emitting section group;
A second electrode provided on the inner surface of the back plate through each of the plurality of light emitting sections belonging to the second light emitting section group and insulated from the first electrode;
A common electrode provided on the inner surface of the back plate through each of the plurality of light emitting sections and for alternatively discharging between the first electrode and the second electrode;
A flat discharge lamp comprising: a dielectric layer covering the first electrode, the second electrode, and the common electrode.   The first electrode and the second electrode each have a comb shape and are fitted to each other at their teeth, and the common electrode meanders between the first electrode and the second electrode. 1 flat discharge lamp.   2. The partition wall has a lattice shape, and the plurality of light emitting sections are located adjacent to each other that belong to the first light emitting section group and those belonging to the second light emitting section group. Or the flat discharge lamp of Claim 2.   In each of the plurality of light emitting sections, one of the common electrode, the first electrode, and the second electrode passes through the center and the other passes through the corner, and the area of the electrode passing through the corner is the center The flat discharge lamp according to any one of claims 1 to 3, wherein the area is equal to or more than 1.5 times the area of the electrode passing through the portion.   The first electrode and the second electrode pass through a central portion of each of the plurality of light emitting sections, and the common electrode passes through a peripheral portion of each of the plurality of light emitting sections. Item 5. The flat discharge lamp according to any one of items 4 to 5.   2. The first electrode and the second electrode pass through the intersection of the partition walls, and the width dimension of each of the plurality of light emitting sections is made larger than the width dimension at the intersection of the partition walls. The flat discharge lamp of any one of thru | or 5.   The flat discharge lamp according to any one of claims 1 to 6, wherein a part of the common electrode is located below an intersection of the barrier ribs.   The planar discharge according to any one of claims 1 to 7, wherein the partition wall covers a part of the common electrode by expanding an intersection point to an inner peripheral side of each of the plurality of light emitting sections. lamp.

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