JP2004087404A - Fluorescent display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To uniform light emission in a light emission display unit in an active matrix type fluorescent display device. <P>SOLUTION: This fluorescence display device comprises an anode substrate 110 where the light emission display unit 120 having a plurality of anode electrodes 114 coated with a fluorescent material 115 arranged in matrix, and a driving circuit comprising a thin film transistor made of polycrystalline silicon which selectively drives the anode electrodes 114 to control the light emission of the light emission display unit 120 are integrally formed on the substrate; a plurality of filament shaped cathodes 140 arranged opposite to the mounting surface of the light emission display of the anode substrate 110; a grid electrode 130 arranged between the anode substrate 110 and the filament shaped cathodes 140; and a vacuum envelope incorporating the anode substrate 110, the filament shaped cathodes 140, and the grid electrode 130 of which at least one face has translucency. An auxiliary electrode 116 surrounding each anode electrode 114 is provided on the anode electrode forming face of the anode substrate 110, and the auxiliary electrode 116 is grounded or connected to a positive voltage source. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluorescent display device, and particularly includes an anode substrate integrally formed with a light emitting display unit in which a plurality of anodes coated with a phosphor are arranged in a matrix and a driving circuit for controlling light emission of the light emitting display unit. The present invention relates to an active matrix type fluorescent display device.
[0002]
[Prior art]
In a fluorescent display device, electrons emitted from a cathode are collided with a phosphor coated on an anode in a vacuum vessel (envelope), at least one of which is transparent, to cause the phosphor to emit light, thereby forming a desired pattern. An electron tube to display. Usually, the fluorescent display device having a triode structure with a grid for controlling the function of electrons is most often used. One of such fluorescent display devices includes an anode substrate integrally formed with a light emitting display section in which a plurality of anodes coated with a phosphor are arranged in a matrix and a driving circuit for controlling light emission of the light emitting display section. There is an active matrix fluorescent display device having a light emitting display surface obtained by being arranged on an insulating substrate.
[0003]
One configuration example of a conventional active matrix type fluorescent display device includes a semiconductor integrated circuit in which a driving circuit is formed on a polycrystalline silicon film disposed on a surface of a glass substrate serving as an anode substrate, and a light emitting display portion is formed of a polycrystalline silicon. It is composed of an anode electrode arranged in a matrix on a passivation film (insulating film) covering the surface of the silicon film and connected to a drive circuit, and a phosphor applied on each anode electrode (for example, JP-A-2002-2002). -8571). In this case, the driving circuit is formed of a thin film transistor formed of a so-called low-temperature polycrystalline silicon film formed on a glass substrate, so that the size and cost can be reduced.
[0004]
[Problems to be solved by the invention]
However, the conventional active matrix type fluorescent display device described above has a problem in that the light emission in the peripheral portion of the light emitting display unit is not uniform and the display quality is deteriorated.
The present invention has been made to solve this problem, and a light emitting display unit in which a plurality of anode electrodes coated with a phosphor are arranged in a matrix and a light emitting display unit that selectively drives the anode electrodes to control light emission of the light emitting display unit. It is an object of the present invention to uniformly emit light from a light emitting display unit in an active matrix type fluorescent display device including an anode substrate in which a driving circuit including a thin film transistor made of crystalline silicon is integrally formed on a substrate.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a light-emitting display unit in which a plurality of anode electrodes coated with a phosphor are arranged in a matrix and a polycrystalline silicon that selectively drives the anode electrodes and controls light emission of the light-emitting display unit. An anode substrate having a driving circuit including a thin film transistor formed integrally with the substrate, a plurality of filamentary cathodes disposed opposite to the light emitting display unit mounting surface of the anode substrate, and between the anode substrate and the filamentary cathode. In a fluorescent display device provided with a grid electrode disposed therein, and a vacuum envelope having at least one surface having a light-transmitting property and a built-in anode substrate, a filamentary cathode, and a grid electrode, the anode substrate is provided with each anode on the anode electrode forming surface. It is characterized by having an auxiliary electrode surrounding the electrode.
[0006]
In this case, the auxiliary electrode is connected to ground or a positive voltage source. When the auxiliary electrode surrounding the anode electrode is connected to ground or a positive voltage source, the auxiliary electrode absorbs excess electrons that do not contribute to light emission. This prevents the surplus electrons from charging the insulating film around the anode electrode, and eliminates disturbance of electrons incident on the anode electrode, so that the light emission of the light emitting display unit is uniform. One configuration example of the auxiliary electrode is black. By making the auxiliary electrode black, the contrast of the display pixel is improved. As an electrode material constituting the black auxiliary electrode, for example, carbon is used.
[0007]
In one configuration example of this fluorescent display device, the vacuum envelope is made of a member having the same expansion coefficient as the substrate of the anode substrate. In another configuration example of the fluorescent display device, the substrate of the anode substrate is housed in a concave portion formed in a vacuum envelope. One configuration example of the anode substrate includes a plurality of connection terminals arranged along an edge of one side of a rectangular substrate. In this case, in one configuration example of the fluorescent display device, a plurality of anode substrates are arranged in a matrix. In another configuration example of the fluorescent display device, the connection terminal of the anode substrate is connected to a lead terminal penetrating the vacuum envelope.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a configuration of a fluorescent display device according to a first embodiment of the present invention. In FIG. 1, (a) is a perspective view showing the entire configuration, and (b) is a light emitting display unit of (a). (C) is a sectional view taken along the line AA of (b). FIG. 2 is a cross-sectional view showing a cut surface including a light-emitting display portion of the anode substrate of FIG. 1 and lead pins connected to the anode substrate. In this fluorescent display device, an anode substrate 110, a grid electrode 130, and a plurality of filament cathodes 140 are accommodated in an envelope formed of a plate glass 101, a spacer glass 102, and a windshield 103.
[0009]
The plate glass 101 has a rectangular shape, a predetermined number of anode substrate wirings 106 having one end connected to the lead connection terminal 105 and the other end connected to the bonding pad 107, and a grid electrode having one end connected to the lead connection terminal 109. Wiring 133 is formed on the surface. These lead connection terminals 109 are arranged along one edge of the plate glass 101 and are connected to the lead pins 104 for the anode substrate and the lead pins 134 for the grid electrode, respectively. In this embodiment, in order to simplify the manufacturing process, the materials of the lead connection terminal 105, the bonding pad 107, and the wirings 106 and 133 are made of the same material, for example, aluminum, so that they can be manufactured in one process. I have.
[0010]
An anode substrate 110 on which a light emitting display unit 120 in which anode electrodes 114 coated with a phosphor 115 are arranged in a matrix and a driving circuit for controlling light emission of the light emitting display unit 120 are integrally formed on the plate glass 101; A pair of grid supports 131 that hold the grid electrode 130 above the anode substrate 110 at a predetermined distance, and a pair of filament supports 142 that hold a plurality of filament cathodes 140 at a predetermined distance above the grid electrode 130. And are arranged.
[0011]
The anode substrate 110 is provided with a predetermined number of bonding pads 117 along the edge of one side of the light-emitting display unit 120 mounting surface, and the side where the bonding pads 117 are disposed is provided with the lead connection terminals 109 of the plate glass 101. It is arranged so as to face the side. Each bonding pad 117 is connected to the bonding pad 107 of the wiring for the anode substrate by a bonding wire 108. The anode substrate 110 is fixed by bonding a surface opposite to the surface on which the light emitting display unit 120 is mounted to the plate glass 101. Here, the bonding to the plate glass 101 is performed with a heat-resistant resin such as a polyimide resin.
[0012]
One grid electrode 130 is spaced above the anode substrate 110 so as to cover the light emitting display unit 120, and a plurality of filament cathodes 140 are arranged above the grid electrode 130 in parallel with and separated from each other. The grid electrode 130 has a mesh shape, and is stretched between a pair of grid supports 131 disposed outside two sides of the anode substrate 110 that are orthogonal to the side on which the bonding pads 117 are disposed. Is fixed with an insulating paste containing frit glass having a low melting point.
[0013]
The grid support 131 is a glass plate that is thicker by a predetermined height than the anode substrate 110 and that is longer than the width of the grid electrode 130. The two grid supports 131 are parallel with the anode substrate 110 therebetween. And is adhered to the plate glass 101. In this case, the grid support 131 is fixed to the plate glass 101 with an insulating paste containing frit glass having a low melting point. The grid electrode 130 has a part of the mesh pulled out from one grid support 131 and fixed to a grid wiring 133 formed on the plate glass 101 with a conductive paste.
[0014]
Each filament cathode 140 is stretched between a pair of anchors 141 arranged to face each other with the pair of grid supports 131 interposed therebetween, and is attached to the anchor 141 by welding. The anchor 141 is attached by welding to a filament support 142 having a leg that also serves as a cathode lead pin 144. The cathode lead pin 144 formed integrally with the filament support 142 is arranged on one edge of the plate glass 101 on which the plurality of lead pins 104 are arranged. Note that components other than the anchor 141 such as a getter ring (not shown) are mounted on the filament support 142.
[0015]
Above the filament cathode 140, a rectangular transparent windshield 103 is arranged opposite to the plate glass 101, and the plate glass 101, the spacer glass 102 arranged around the plate glass 101, and the windshield 103 are arranged. An envelope is formed by bonding with frit glass, and the inside is kept in a vacuum. The lead pins 104, 134, 144 are arranged on one side of the plate glass 101, and are drawn out from between the plate glass 101 and the spacer glass 102. The leg of the filament support 142 is also sandwiched between the plate glass 101 and the spacer glass 102, and is adhered and fixed with frit glass. Here, the bases of the plate glass 101, the spacer glass 102, the windshield 103, and the anode substrate 110 are made of members having the same expansion coefficient to prevent distortion or breakage due to a difference in thermal expansion coefficient. In this embodiment, borosilicate glass, which is a base of an anode substrate 110 described later, is used for a glass member constituting a vacuum envelope.
[0016]
Next, the anode substrate 110 will be described in detail with reference to FIG. The anode substrate 110 is an active matrix substrate in which a light emitting display unit 120 and a driving circuit for controlling light emission of the light emitting display unit 120 are integrally formed. The anode substrate 110 has a glass substrate 111 as a base, and a polycrystalline silicon film 112 is formed on the surface of the glass substrate 111. A semiconductor integrated circuit including a thin film transistor (TFT) is formed on the polycrystalline silicon film 112, and a driving circuit is configured by the semiconductor integrated circuit. The thin film transistor formed over the polycrystalline silicon film 112 has high performance, which is about two to three orders of magnitude higher in mobility than a thin film transistor formed over an amorphous silicon film. It is effective for
[0017]
Here, as the polycrystalline silicon film 112, a so-called low-temperature polycrystalline silicon film formed at a processing temperature equal to or lower than the strain point of the glass substrate 111 is used. This low-temperature polycrystalline silicon film is usually formed at 450 ° C. to 600 ° C., and is formed by a known technique such as a chemical vapor deposition (CVD) method. For the glass substrate 111, borosilicate glass containing no sodium or the like that adversely affects transistor characteristics is used. The semiconductor integrated circuit formed on the polycrystalline silicon film 112 is manufactured by a well-known manufacturing process using a low-temperature polycrystalline silicon film.
[0018]
The surface of the polycrystalline silicon film 112 is covered with a passivation film (insulating film) 113, and a light emitting display unit 120 is formed on the passivation film 113. The light emitting display section 120 includes anode electrodes 114 arranged in a matrix at a predetermined pitch on the passivation film 113, dot-shaped phosphors 115 applied on the respective anode electrodes 114, and surrounds the respective anode electrodes 114. And a grid-like auxiliary electrode 116 disposed on the passivation film 113.
[0019]
Immediately below each anode electrode 114, a thin film transistor forming portion 112a of an anode driving portion forming a part of a driving circuit is formed, and is connected to the anode electrode 114 via a through hole 113a provided in the passivation film 113. . The auxiliary electrode 116 is connected to one of the bonding pads 117. In this case, the anode electrode 114, the auxiliary electrode 116, and the bonding pad 117 are made of aluminum, and the phosphor 115 is made of a phosphor material used in a conventional fluorescent display device. The material of the auxiliary electrode 116 is not limited to aluminum. For example, the auxiliary electrode 116 may be made of carbon. When the auxiliary electrode 116 is made of carbon, the color of the auxiliary electrode 116 becomes black, and each pixel is surrounded by a black grid. A well-known conventional technique can be used for forming the passivation film 113, the anode electrode 114, the phosphor 115, the auxiliary electrode 116, and the bonding pad 117.
[0020]
FIG. 3 is a block diagram showing a circuit configuration of the anode substrate, and shows an example of a drive circuit for controlling lighting of display pixels arranged in a matrix of N vertical dots × M horizontal dots (N and M are natural numbers). The drive circuit includes a plurality of (N × M) anode drive units 201 having a memory function for driving the anode electrode 114 provided for each display pixel for a predetermined period and a display on each anode drive unit 201. A data input control unit for inputting and driving data.
[0021]
The anode driving unit 201 has a column input a for inputting a drive signal, a row input b for inputting display data, and an output for driving the anode electrode 114. In this case, the anode driving unit 201 includes a memory transistor 211, a capacitor 212, and a driving transistor 213, as shown in FIG. Is formed on the polycrystalline silicon film 112. In this case, the memory transistor 211 and the driving transistor 213 are formed of field-effect transistors, a column input a for inputting a driving signal is connected to the gate of the memory transistor 211, and the display data is connected to the source of the memory transistor 211. Is input.
[0022]
Further, the drain of the memory transistor 211 is connected to one terminal of the capacitor 212 and the gate of the driving transistor 213, and the source of the driving transistor 213 is connected to a connection terminal (not shown) of VDD which is an anode voltage. The drain of the driving transistor 213 is connected to the anode electrode 114. The other terminal of the capacitor 212 is grounded via a ground connection terminal (not shown). Accordingly, when the display data is turned on and a drive signal is input, the memory transistor 211 charges the capacitor 212, and the charged capacitor 212 holds the drive transistor 213 in the ON state for a predetermined period, and the anode electrode 114 is driven.
[0023]
Further, an auxiliary electrode 116 surrounding the anode electrode 114 is grounded via a ground connection terminal (not shown). Since the auxiliary electrode 116 is grounded, the light emission is uniform in the pixels in the peripheral portion of the light emitting display section, and the display quality is improved. Note that the auxiliary electrode 116 may be connected to a connection terminal (not shown) of VDD that is an anode voltage so that a positive voltage is applied. Even in this case, the same effect as when the auxiliary electrode 116 is grounded can be obtained. By connecting the auxiliary electrode 116 to the ground or a positive voltage source, the light emission around the light emitting display unit is made uniform because the insulator around the anode electrode 114 is prevented from being charged, and the electrons incident on the anode electrode 114 are prevented from being charged. It is thought that this is to eliminate the disturbance.
[0024]
The data input control unit receives the display data of each row for one column, and causes the anode drive unit 201 of each row to input the data by one column at a predetermined timing. And an output control unit for outputting the display data input for each column. The data input unit includes N cascade-connected D flip-flop circuits 202 and N latch circuits 203 connected to the data output Q of each D flip-flop circuit 202, and the output control unit includes cascade-connected M flip-flop circuits. It comprises D flip-flop circuits 204 and M latch circuits 205 connected to the data output Q of each D flip-flop circuit 204.
[0025]
In the data input unit, the signal terminal of the vertical synchronization clock VCK is connected to the clock input CK of each D flip-flop circuit 202, and the data input D of the first D flip-flop circuit 202 is connected to the vertical data VDA which is the display data of each pixel. The signal terminal is connected, and the data output Q of the preceding D flip-flop circuit 202 is connected to the data input D of the next D flip-flop circuit 202 and the input IN of the preceding latch circuit 203. The signal terminal of the vertical N dot enable signal VWR is connected to the clock input C of each latch circuit 203, and the output OUT of each latch circuit 203 is connected to the row input b of each anode drive unit 201.
[0026]
In the output control unit, the signal terminal of the horizontal synchronization clock HCK is connected to the clock input CK of each D flip-flop circuit 204, and the signal terminal of the horizontal data HDA which is the driving signal is connected to the data input D of the first D flip-flop circuit 204. The data output Q of the preceding D flip-flop circuit 204 is connected to the data input D of the next D flip-flop circuit 204 and the input IN of the preceding latch circuit 205. The signal terminal of the horizontal M dot enable signal HWR is connected to the clock input C of each latch circuit 205, and the output OUT of each latch circuit 205 is connected to the column input a of each anode drive unit 201.
[0027]
Since the anode substrate 110 has such a circuit configuration, it is possible to perform a horizontal scan (rewrite display data vertically by one column) by inputting a signal shown in FIG. FIG. 5 is a timing chart showing control waveforms of the fluorescent display device. 5A shows a vertical synchronization clock VCK, FIG. 5B shows vertical data VDA, FIGS. 5C and 5D show a horizontal M dot enable signal HWR, FIG. 5E shows a horizontal synchronization clock HCK, and FIG. Data HDA, (g) is a vertical N dot enable signal VWR.
[0028]
In this case, by inputting N pieces of vertical data VDA as display data in synchronization with the vertical synchronization clock VCK, display data for one column is held in the corresponding latch circuit 203 of the data input unit, and the horizontal M dot enable signal A drive signal is output from the latch circuit 205 in the corresponding column of the output control unit by the HWR, and the display data is rewritten one column at a time by driving the anode drive unit 201 connected to this column. The selection of the corresponding column by the output control unit is performed by transferring the horizontal data HDA transmitted prior to the display data for one screen to each D flip-flop circuit 204 of the output control unit by the horizontal synchronization clock HCK.
[0029]
Since the anode substrate 110 includes a control circuit for performing active matrix driving, regardless of the number of rows and columns of the display screen, six signal lines (VCK, VDA, VWR, HCK, HDA, HWR) and a power supply are provided. Each anode 114 can be driven only by connecting the supply line (VDD, ground). For this reason, the number of connection points is reduced, and connection reliability is improved. In addition, since the number of connection points is small, the connection point of the bonding wire 108 can be limited to only one side of the anode substrate 110. Therefore, the wiring of the anode substrate wiring 106 formed on the plate glass 101 is simplified, and the manufacturing is easy. Become.
[0030]
In this fluorescent display device, thermions emitted from the energized and heated filament cathode 140 are diffused and accelerated by the positive voltage applied to the grid electrode 130, and are constantly irradiated on the anode substrate 110. The light is incident on the anode 114 to which the positive voltage is applied by the active matrix driving, causing the phosphor 115 to emit light, and the screen display of the input data is performed. On the other hand, the electrons irradiated on the anode 114 to which the positive voltage is not applied or on the anodes 114 in the row that is not driven until the next drive cycle enters the auxiliary electrode 116 and are absorbed. As described above, since the auxiliary electrode 116 absorbs the surplus electrons that do not contribute to light emission, charging of the passivation film 113 and the like due to the surplus electrons is prevented.
[0031]
In the fluorescent display device according to this embodiment, the anode substrate 110 that performs active matrix driving has a grid-like auxiliary electrode 116 surrounding each anode electrode 114 on the anode electrode forming surface, and this auxiliary electrode 116 is connected to ground or positive voltage. Since the light source is connected to the light source, the light emission is uniform even in the pixels in the peripheral portion of the light emitting display portion, and the display quality is improved. Since the anode substrate 110 has a plurality of connection terminals connected to the driving circuit and the auxiliary electrode 116 arranged along one edge of the rectangular substrate, the plurality of anode substrates are arranged in a matrix. It is possible to configure a larger screen by closely contacting the screen.
[0032]
FIG. 6 is a perspective view illustrating a configuration of a fluorescent display device according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view showing a cut surface including a light emitting display portion of the anode substrate of FIG. 6 and a lead pin connected to the anode substrate. 6 and 7, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts. The difference between the fluorescent display device according to this embodiment and the fluorescent display device according to the first embodiment is that the plate glass 101 constituting the vacuum envelope houses the glass substrate 111 which is the substrate part of the anode substrate 110. A concave portion (groove) having a possible depth is provided. A glass substrate 111 is bonded to the bottom of the concave portion, and a lead connection terminal 119 is disposed on the anode substrate 110 instead of a bonding pad. 119 is that the lead pins 104 for the anode substrate are directly connected.
[0033]
According to this embodiment, since the substrate portion of the anode substrate 110 is accommodated in the groove of the plate glass 101, the height of the grid electrode 130 and the filament cathode 140 can be reduced by the thickness of the glass substrate 111. For this reason, it is possible to use a general support member of a fluorescent display tube using a plate glass as an anode substrate for a support member of a grid electrode or a filament cathode. Further, since the lead pins 104 are directly connected to the anode substrate, it is not necessary to form the wiring for the anode substrate on the plate glass 101 or to connect the bonding wires. For this reason, in addition to the effects obtained in the first embodiment, the effects of improving reliability by reducing the number of connection points and reducing production costs by reducing the number of manufacturing steps can be expected.
[0034]
In these embodiments, borosilicate glass is used to make the glass member constituting the vacuum envelope have the same coefficient of thermal expansion as the anode substrate. However, a common soda is used for the glass member constituting the vacuum envelope. Glass may be used. In this case, in order to prevent distortion or breakage due to a difference in thermal expansion coefficient, it is preferable to fix the anode substrate to only one side on which the bonding pads and the lead connection terminals are formed with an adhesive. At this time, in order to prevent the substrate from tilting due to the thickness of the adhesive, for example, a groove for filling the adhesive may be provided.
[0035]
【The invention's effect】
As described above, the fluorescent display device of the present invention includes a light-emitting display unit in which a plurality of anode electrodes coated with a phosphor are arranged in a matrix and a polycrystalline silicon that selectively drives the anode electrodes and controls light emission of the light-emitting display unit. And a driving circuit including a thin film transistor comprising an auxiliary electrode surrounding each anode electrode on the anode electrode forming surface of the anode substrate formed integrally on the substrate, by connecting this auxiliary electrode to ground or a positive voltage source. Also in the pixels in the peripheral portion of the light emitting display section, the light emission becomes uniform, and the effect of improving the display quality is obtained. In addition, since the anode substrate surrounds the anode electrode to which the thin film transistor is connected with the auxiliary electrode, which is a conductor, an effect of preventing electrostatic breakdown of the thin film transistor during the manufacturing process can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a fluorescent display device according to a first embodiment.
FIG. 2 is a cross-sectional view showing a cut surface including a light emitting display portion of the anode substrate of FIG. 1 and a lead pin connected to the anode substrate.
FIG. 3 is a block diagram showing a circuit configuration of an anode substrate.
FIG. 4 is a circuit diagram of an anode driving unit shown in FIG. 3;
FIG. 5 is a timing chart showing control waveforms of the drive circuit of FIG.
FIG. 6 is a perspective view illustrating a configuration of a fluorescent display device according to a second embodiment.
7 is a cross-sectional view showing a cut surface including a light emitting display portion of the anode substrate of FIG. 6 and a lead pin connected to the anode substrate.
[Explanation of symbols]
101: plate glass, 101a: groove, 102: spacer glass, 103: front glass, 104, 134, 144: lead pin, 105, 109, 119: lead connection terminal, 106: wiring for anode substrate, 107, 117: bonding pad 108, bonding wire, 110, anode substrate, 111, glass substrate, 112, polycrystalline silicon film, 112a, thin film transistor forming portion, 113, passivation film (insulating film), 113a, through hole, 114, anode electrode, 115, Phosphor, 116: auxiliary electrode, 120: light emitting display unit, 130: grid electrode, 131: grid support, 133: grid wiring, 140: filament cathode, 141: anchor, 142: filament support, 201: anode driving unit, 202 , 204 ... pretend Flop circuit, 203 and 205 ... latch circuit, 211 ... memory transistors, 212 ... capacitor, 213 ... driving transistor.

Claims (8)

A light emitting display section in which a plurality of anode electrodes coated with a phosphor are arranged in a matrix and a driving circuit including a thin film transistor made of polycrystalline silicon for selectively driving the anode electrodes and controlling light emission of the light emitting display section are provided on a substrate. An anode substrate formed integrally, a plurality of filamentary cathodes arranged opposite to the light emitting display unit mounting surface of the anode substrate, a grid electrode arranged between the anode substrate and the filamentary cathode, and the anode A fluorescent display device comprising: a vacuum envelope having at least one surface including a substrate, the filament cathode, and the grid electrode, the transparent envelope having at least one surface,
The anode substrate,
A fluorescent display device comprising an auxiliary electrode surrounding each anode electrode on the anode electrode forming surface. The fluorescent display device according to claim 1,
The fluorescent display device, wherein the auxiliary electrode is connected to a ground or a positive voltage source. The fluorescent display device according to claim 1 or 2,
The fluorescent display device, wherein the auxiliary electrode is black. The fluorescent display device according to any one of claims 1 to 3,
The vacuum envelope is
A fluorescent display device comprising a member having the same expansion coefficient as that of the anode substrate. The fluorescent display device according to any one of claims 1 to 4,
The substrate of the anode substrate,
The fluorescent display device is housed in a recess formed in the vacuum envelope. The fluorescent display device according to any one of claims 1 to 4,
The anode substrate,
A fluorescent display device comprising: a plurality of connection terminals arranged along one edge of the substrate formed in a rectangular shape. The fluorescent display device according to claim 6,
The fluorescent display device, wherein a plurality of the anode substrates are arranged in a matrix. The fluorescent display device according to claim 6,
The connection terminal of the anode substrate,
The fluorescent display device is connected to a lead terminal penetrating the vacuum envelope.

Images