JP2001196016A - Double-side emitting fluorescent display tube and its driving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-side emitting fluorescent display tube that has a small number of components, simple structure, small thickness, easy assembling and small power consumption. SOLUTION: Anodes of rear substrate 32 are selected to emit light, 0 V is applied to the anode 351 through 355 when not selected, but 12 V applied when selected. Whereas -12 V is applied to the anodes 322 through 325 when not selected, but 0 V applied when selected. When anodes of front substrate 31 are selected to emit light -25 V is applied to anodes 351 through 355 when not selected, but 0 V applied when selected. Wereas -25 V is applied to anodes 322 through 325 when not selected, but 12 V applied when selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided light emitting fluorescent display tube having a front substrate and a rear substrate formed with an anode electrode coated with a phosphor.

[0002]

2. Description of the Related Art Conventionally, a front-side substrate and a rear-side substrate are each formed with an anode electrode coated with a phosphor, a separate grid is arranged on each anode electrode, and a filament is stretched between both grids. Display tubes are known. FIG. 6 shows a plan view and a sectional view of a conventional double-sided fluorescent display tube. FIG. 6A is a plan view, and FIG.
FIG. 6A is a cross-sectional view taken along the line XX of FIG. An anode electrode 7 coated with a phosphor 73 is applied to a glass front substrate 71.
2, and a grid 74 is arranged so as to face the anode electrode 72. An anode electrode 76 coated with a phosphor 77 is formed on a back substrate 75 made of glass, and a grid 78 is arranged to face the anode electrode 76. A filament 79 is stretched between the grids 74 and 78 and fixed to a support member 80. Grid 74, 7
8 is a filament 79 from both anode electrodes 72 and 76
To control the emission of electrons to

[0003]

The conventional double-sided fluorescent display tube has a grid 7 opposed to the anode electrodes 72 and 76.
The arrangement of 4, 78 increases the number of parts, complicates the structure, and makes it difficult to reduce the thickness of the fluorescent display tube. Further, when assembling the fluorescent display tube, there is a problem that the manufacturing process is complicated, for example, it is difficult to position the grid and the anode electrode. Also, power consumption by the grid was a problem.
In view of this point, an object of the present invention is to provide a double-sided fluorescent display tube which has a small number of parts, has a simple structure, is thinner, is easy to manufacture, and has low power consumption.

[0004]

According to the present invention, the conventional grid is not provided, and the anode electrode also has the function of the conventional grid. The anode electrode of one substrate is used to transfer electrons to the anode electrode of the other substrate. It is configured to act as a control electrode for controlling radiation. The present invention provides a dual-sided fluorescent light comprising a back substrate on which a phosphor-coated anode electrode is formed, a front substrate on which a phosphor-coated anode electrode is formed, and a filament provided between the back substrate and the front substrate. In the display tube, when the anode electrode on the rear substrate is used as a light emitting electrode, the anode electrode on the front substrate is used as a control electrode for electrons emitted from the filament to the light emitting electrode, and when the anode electrode on the front substrate is used as the light emitting electrode, The anode electrode on the back substrate is used as a control electrode for electrons emitted from the filament to the light emitting electrode. In this case, either of the two substrates may be the front substrate or the rear substrate.

The present invention comprises a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. In the dual emission fluorescent display tube, a first potential equal to the filament potential, a second potential higher than the filament potential, and a third potential lower than the filament potential.
When a potential is generated and the phosphor on the rear substrate emits light, a second potential is applied to an anode electrode on the rear substrate, a first potential is applied to a selected anode electrode on the front substrate, and a second potential is applied to a non-selected anode electrode. When the third potential is applied and the phosphor on the front substrate emits light, the first potential is applied to the anode electrode on the rear substrate, the second potential is applied to the selected anode electrode on the front substrate, and the non-selected anode is applied. Means for applying a first potential to the electrode is provided.

The present invention comprises a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. In the dual emission fluorescent display tube, a first potential equal to the filament potential, a second potential higher than the filament potential, and a third potential lower than the filament potential.
Potential, fourth lower than filament potential and higher than third potential
When a potential is generated and the phosphor on the rear substrate emits light, a second potential is applied to a selected anode electrode on the rear substrate,
When applying a first potential to a non-selected anode electrode, applying a first potential to a selected anode electrode on the front substrate, and applying a fourth potential to a non-selected anode electrode to cause the phosphor on the front substrate to emit light Applying a first potential to a selected anode electrode on the back substrate, applying a third potential to a non-selected anode electrode, applying a second potential to a selected anode electrode on the front substrate, and applying a second potential to the non-selected anode electrode. Means for applying a third potential are provided.

The present invention comprises a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. When the anode electrode on the rear substrate is used as a light-emitting electrode in a double-sided fluorescent display,
When the anode electrode on the front substrate is used as a control electrode for electrons emitted from the filament to the light-emitting electrode, and when the anode electrode on the front substrate is used as the light-emitting electrode, the anode electrode on the back substrate is used to control the electrons emitted from the filament to the light-emitting electrode. As the electrodes, the anode electrode of the back substrate and the anode electrode of the front substrate are arranged in a range in which electrons emitted from the filament can be controlled to the anode electrodes arranged opposite to each other,
The phosphor layer on the rear substrate and the phosphor layer on the front substrate are arranged in a range where electrons emitted from the filament can be controlled to the phosphor layers disposed opposite each other, and the anode electrode on the rear substrate is dynamically connected. The anode electrode on the front substrate is formed in a solid pattern for each digit.

The present invention comprises a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. In the dual emission fluorescent display tube, a first potential equal to the filament potential, a second potential higher than the filament potential, and a third potential lower than the filament potential.
When a potential is generated and the phosphor on the rear substrate emits light, a second potential is applied to an anode electrode on the rear substrate, a first potential is applied to a selected anode electrode on the front substrate, and a second potential is applied to a non-selected anode electrode. When the third potential is applied and the phosphor on the front substrate emits light, the first potential is applied to the anode electrode on the rear substrate, the second potential is applied to the selected anode electrode on the front substrate, and the non-selected anode is applied. A first potential is applied to the electrodes to cause the phosphors on the rear substrate and the front substrate to emit light alternately.

The present invention comprises a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. In the dual emission fluorescent display tube, a first potential equal to the filament potential, a second potential higher than the filament potential, and a third potential lower than the filament potential.
Potential, fourth lower than filament potential and higher than third potential
When a potential is generated and the phosphor on the rear substrate emits light, a second potential is applied to a selected anode electrode on the rear substrate,
When applying a first potential to a non-selected anode electrode, applying a first potential to a selected anode electrode on the front substrate, and applying a fourth potential to a non-selected anode electrode to cause the phosphor on the front substrate to emit light Applying a first potential to a selected anode electrode on the back substrate, applying a third potential to a non-selected anode electrode, applying a second potential to a selected anode electrode on the front substrate, and applying a second potential to the non-selected anode electrode. By applying the third potential, the phosphors on the back substrate and the front substrate emit light alternately.

The present invention comprises a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, a filament provided between the back substrate and the front substrate, When the anode electrode on the back substrate is used as a light emitting electrode, the anode electrode on the front substrate is used as a control electrode for electrons emitted from the filament to the light emitting electrode,
When the anode electrode of the front substrate is used as the light-emitting electrode, the anode electrode of the back substrate is used as a control electrode for electrons emitted from the filament to the light-emitting electrode, and the anode electrode of the back substrate and the anode electrode of the front substrate are arranged to face each other. The phosphor layer on the back substrate and the phosphor layer on the front substrate are arranged in a range where electrons emitted from the filament to the anode electrode can be controlled. The anode electrode on the rear substrate is dynamically connected,
The anode electrode of the front substrate is a filament potential (0 V) in a double-sided fluorescent display tube formed in a solid shape for each digit.
, A second potential (12 V) higher than the filament potential, and a third potential (−2) lower than the filament potential.
5V), a fourth potential (−12 V) lower than the filament potential and higher than the third potential is generated, and when the phosphor on the rear substrate emits light, the second anode electrode is applied to the selected anode electrode on the rear substrate.
A potential (12 V) is applied, a first potential (0 V) is applied to a non-selected anode electrode, a first potential (0 V) is applied to a selected anode electrode on the front substrate, and a fourth potential is applied to a non-selected anode electrode. When applying (−12 V) to emit light from the phosphor on the front substrate, a first potential (0 V) is applied to a selected anode electrode on the rear substrate, and a third potential (−25 V) is applied to a non-selected anode electrode. Is applied, a second potential (12 V) is applied to a selected anode electrode on the front substrate, and a third potential (-25 V) is applied to a non-selected anode electrode, and the phosphors on the rear substrate and the front substrate are alternately applied. To emit light.

[0011]

FIG. 1 is a cross-sectional view of a double-sided fluorescent display tube used for electric field analysis for explaining the principle of the embodiment of the present invention. Reference numeral 11 denotes a glass front substrate, and anode electrodes 121 to 123 coated with phosphors 131 to 133.
Is formed. Reference numeral 14 denotes a glass back substrate on which an anode electrode 15 coated with a phosphor 16 is formed. 17
1 to 173 are filaments whose electron emission is
The electrodes are arranged in a range that can be controlled by the anode electrodes 121 to 123 and the anode electrode 15. The width of both anode electrodes is 6 mm (the anode electrodes of the front substrate are 121 to 123
), The distance between the filaments 171 to 173 and the anode electrodes 121 to 123 and 15 is 0.7 mm, and the distance between the filaments 171 and 172 and 172 and 173 is 2 mm. In the case of FIG. 1, in consideration of the contact between the filament and the anode electrode and the control range between the anode electrodes, the interval between the filament and the anode electrode is
0.1 mm to several mm is preferable. Here, it is possible to increase the distance between the filament and the anode electrode by increasing the cutoff potential applied to the control electrode. However, considering the withstand voltage and cost of the driving IC, the The distance from the electrode is more preferably 0.5 mm to 1.5 m. (0.00), (2.00), (4.0
0) indicates the position in the width direction of the anode electrodes 121 to 123, 15 and corresponds to the position of the filaments 171, 172, 173.

FIG. 2 is a graph showing the current density of the anode electrode of the fluorescent display tube of FIG. 1 based on the electric field analysis. The vertical axis indicates the current density (mA / cm ² ), and the horizontal axis indicates the distance (Distance) in the width direction of the anode electrode, which corresponds to the positional relationship in FIG. Ip denotes the anode electrodes 121 to 12
3 represents the current density, and Iback represents the current density of the anode electrode 15. Graphs B1 to B4 and F1 to F4 correspond to cases B1 to B4 and F1 to F4 in the following table, respectively. The table shows cases B1 to B4 for light emission selection surfaces, light emission locations, potentials applied to anode electrodes, and application locations when the phosphors of the front substrate 11 and the rear substrate 14 emit light.
It is posted separately for F1 to F4. In each case,
Zero potential is applied to the filament. Front substrate 1
0 V is set as the first potential equal to the filament potential, 12 V is set as the second potential higher than the filament potential, and -25 V is set as the third potential lower than the filament potential at the anode electrodes of the first and back substrates 14. .

[0013]

[Table 1]

In FIG. 2, for example, a graph F 1 shows a case where the anode electrode 121, that is, the position (0.00) and both sides thereof are selected as light emitting portions,
V, 12 V on the anode electrode 121, 12 on the anode electrode 12
0V is applied to 2,123. In this case, a current Ip contributing to light emission is applied to the anode electrode 121.
21 are distributed almost uniformly over the entire width. On the other hand, the current Iback slightly occurs in the anode electrode 15 near the position (0.00). This indicates that most of the electrons emitted from the filament 171 by the anode electrode 15 are emitted to the anode electrode 121. That is, the anode electrode 15 is
It acts as a control electrode for the electrons emitted to 1.

The graph B1 in FIG. 2 shows the case where the position (0.00) of the back electrode 15 and the portion opposite to the anode electrode 121 on both sides thereof are selected as the light emitting portions. 0V is applied to 121 and -25V is applied to the anode electrodes 122 and 123. In this case, the current Iback that contributes to light emission is distributed almost uniformly at the position (0.00) of the anode electrode 15 and at the portions opposing the anode electrode 121 on both sides thereof. On the other hand, anode electrode 1
In 21, the current Ip is slightly generated near the position (0.00). From this, it is understood that most of the electrons emitted from the filament 171 by the anode electrode 121 are emitted to the position (0.00) of the anode electrode 15 and to both sides thereof. That is, the anode electrode 121
Functions as a control electrode for electrons emitted to the anode electrode 15. The graph F3 in FIG.
21, 122, ie positions (0.00), (2.00)
And both sides thereof are selected as light emitting locations, where 0 V is applied to the anode electrode 15 and 12 V is applied to the anode electrodes 121 and 122.
V, 0 V is applied to the anode electrode 123. in this case,
In the anode electrodes 121 and 122, the current Ip contributing to light emission is distributed almost uniformly over the entire width of both anode electrodes. On the other hand, in the anode electrode 15, a current Iback slightly occurs near the positions (0.00) and (2.00). From this, most of the electrons emitted from the filaments 171 and 172 by the anode electrode 15 are:
It can be seen that the radiation is emitted to the anode electrodes 121 and 122. That is, the anode electrode 15 is
1, 122 act as control electrodes for the electrons emitted.

The graph B3 in FIG. 2 shows the case where the positions (0.00) and (2.00) of the back electrode 15 and the portions opposing the anode electrodes 121 and 122 on both sides thereof are selected as the light emitting portions. 12V to the anode electrode 15, 0V to the anode electrodes 121 and 122, and -25V to the anode electrode 123.
Is applied. In this case, the position of the anode electrode 15 (0.
00), (2.00) and the anode electrode 1 on both sides thereof.
Currents Iback contributing to light emission are distributed almost uniformly in the portions facing 21 and 122. On the other hand, anode electrode 1
21 and 122, the current Ip is at the position (0.00),
It occurs slightly around (2.00). Therefore, most of the electrons emitted from the filaments 171 and 172 by the anode electrodes 121 and 122 are radiated to the positions (0.00) and (2.00) of the anode electrode 15 and both sides thereof. I understand. That is, the anode electrodes 121 and 122 function as control electrodes for electrons emitted to the anode electrode 15.

Similarly, for the other graphs F2, F4, B2, and B4, when the anode electrode of one substrate is selected as the light emitting anode electrode, the anode electrode of the other substrate is radiated to the light emitting anode electrode. Act as an electron control electrode. As described above, according to the present invention, light can be emitted by selecting a predetermined portion of the anode electrode on the front substrate or the rear substrate without providing a conventional grid.

FIG. 3 shows an anode electrode pattern and wiring according to the embodiment of the present invention. FIG. 4 shows a timing chart of signals applied to the anode electrode of FIG. "3.4.AM" is displayed. 0 potential is applied to a filament not shown. The potential applied to the anode electrodes of the front substrate 31 and the rear substrate 32 is 0 V as a first potential equal to the filament potential, 12 V as a second potential higher than the filament potential, -25 V as a third potential lower than the filament potential, -12 V is set as a fourth potential lower than the filament potential and higher than the third potential. A filament (not shown) common to the anode electrodes of both substrates is stretched between the front substrate 31 and the rear substrate 32. The filaments are connected to terminals c1, c2 to c4,
It is desirable to stretch five or more segments corresponding to the segment electrode rows connected to 5c, 6c to c8, and c9, respectively.

On the rear substrate 32 made of glass, five-digit anode electrode groups 351 to 355 are formed. 351-35
Reference numeral 4 denotes a group of seven-segment anode electrodes, each of which is coated with a phosphor. 355 is the letter A
A group of anode electrodes indicating M and PM, and a phosphor is applied. 3511, 3521, 3531, 3541, 3
Reference numeral 551 denotes an anode electrode to which no phosphor is applied, which is used as a control electrode for electrons emitted from the filament to the selected light emitting anode electrode. Anode electrode group 351-
Each of the segment electrodes 355 is connected in series with the segment electrodes of the adjacent anode electrode group in a row, that is, a so-called dynamic connection, and each row is connected to terminals c1 to c9, respectively. Terminals c1 to c2, c4 to c6, c8 to c9 are provided with signals c1 to c2, c4 to c6, c8 to c9 of FIG.
And the signals c3 and c7 of FIG. 4 are applied to the terminals c3 and c7, respectively. Anode electrodes 321 to 325 are formed on a glass front substrate 31. Anode electrode 321
Reference numerals 324 denote so-called solid electrodes, in which seven segments in the shape of a Japanese character are drawn using a phosphor. The electrode 325 has
Characters AM and PM are drawn by phosphor. The anode electrodes 321 to 325 are connected to terminals d1 to d5, respectively. The signals d1 to d5 of FIG.
Is applied.

On the rear substrate 32, "1, 2, 3, 4, AM"
Is displayed, the signal c during the back surface selection period in FIG.
1 to c9 and d1 to d5 are applied to terminals c1 to c9 of the rear substrate 32 and terminals d1 to d5 of the front substrate 31, respectively. When light emission display of "1, 2, 3, 4, AM" is performed on the front substrate 31, the signals c1 to c during the front selection period in FIG.
9, d1 to d5 are respectively connected to terminals c1 to
c9, voltage is applied to terminals d1 to d5 of front substrate 32. In the back surface selection period, 12 V is applied to the selected segment electrodes of the anode electrode groups 351 to 355, and 0 V is applied to the non-selected segment electrodes.
To c2, c4 to c6, and c8 to c9. Anode electrodes 3511, 3521, 3531, 3541, 3
0V is applied to 551 from terminals c3 and c7 of rear substrate 32. Further, 0V is applied to selected ones of the anode electrodes 321 to 325, and -12V is applied to non-selected electrodes from the terminals d1 to d5 of the front substrate 31, respectively.

During the front selection period, 0V is applied to the selected segment electrodes of the anode electrode groups 351-355.
However, -25 volts are applied to the unselected segment electrodes, and the terminals c1 to c2, c4 to c6, and c8 to
Applied from c9. Anode electrodes 3511 and 352
-1, 2531, 3541, 3551 have -25V,
The voltage is applied from the terminals c3 and c7 of the front substrate 31, respectively. Also, 12V is applied to selected ones of the anode electrodes 321 to 325, and -25V is applied to non-selected electrodes from the terminals d1 to d5 of the front substrate 31, respectively. By alternately repeating the back selection period and the front selection period,
"1, 2, 3, 4, A" on both the front substrate and the rear substrate
M ”can be displayed continuously. The anode electrodes 3511, 3521, 3531, 3541, 3551
Is an auxiliary control electrode and need not be provided.

FIG. 5 shows another example of the anode electrode pattern of the present invention. The pattern of the fifth digit is different from that of FIG. 4, and the display content of the fifth digit is different between the front substrate and the rear substrate.

In the embodiment, 31 is the front substrate and 32 is the rear substrate. However, the reverse may be adopted, and either may be the front substrate or the rear substrate. Further, in the embodiment, the front substrate and the rear substrate are described as being made of glass. However, the invention is not limited to glass, and any insulating material may be used. Any substrate may be used as long as it has translucency. The anode electrodes of the front substrate and the rear substrate may be translucent or non-translucent, but when observing from both the front substrate and the rear substrate, the electrodes of both substrates are made translucent. In the case of observing from only one of the front substrate and the rear substrate, it is sufficient that at least the electrodes of the observation-side substrate have translucency. The light-transmitting electrode may be formed of a transparent conductive material, or may be formed by forming a light-transmitting hole in an opaque conductive material such as aluminum. The stretching direction of the filament may cross the anode electrode or may be parallel to the anode electrode. Further, a pressure-resistant support may be provided as necessary.

[0024]

According to the present invention, in the dual emission fluorescent display tube, since the conventional grid is not required, the number of parts is small, the structure is simple, the thickness can be reduced, and the alignment at the time of assembly is achieved. Etc. are simplified, and the manufacturing process is simplified. In the conventional double-sided fluorescent display tube, power is consumed by the grid. However, according to the present invention, since there is no grid, the power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fluorescent display tube used for an electric field analysis according to the present invention.

FIG. 2 shows a current density of an anode electrode based on an electric field analysis of the present invention.

FIG. 3 shows a pattern and wiring of an anode electrode according to an embodiment of the present invention.

FIG. 4 is a timing chart of signals applied to terminals of FIG. 3;

FIG. 5 is a plan view of an anode electrode pattern according to another embodiment of the present invention.

FIG. 6 shows a plan view and a cross-sectional view of a conventional dual emission fluorescent display tube.

[Explanation of symbols]

11
Front substrate 121, 122, 123
Anode electrode 131, 132, 133
Phosphor 14
Back substrate 15
Anode 16
Phosphors 171, 172, 173
Filament 31
Front substrate 32
Back substrate 321, 322, 323, 324, 325
Anode electrode 351, 352, 353, 354, 355
Anode electrode group 3511, 3521, 3531, 3541, 3551
Anode electrode

[Procedure amendment]

[Submission date] June 12, 2000 (2006.1.
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

The present invention includes a back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate, When the anode electrode of the back substrate is used as a light emitting electrode, the anode electrode of the front substrate is used as a control electrode for electrons emitted from the filament to the light emitting electrode, and when the anode electrode of the front substrate is used as the light emitting electrode,
The anode electrode on the back substrate is used as a control electrode for electrons emitted from the filament to the light-emitting electrode, and the anode electrode on the back substrate and the anode electrode on the front substrate control the electrons emitted from the filament to the anode electrodes that are arranged to face each other. The phosphor layer of the back substrate and the phosphor layer of the front substrate are arranged in a range where electrons emitted from the filament can be controlled to the phosphor layers arranged opposite to each other. the anode electrode was a dynamic connection, the anode electrode of the front substrate, in the double-sided fluorescent display formed solidly to each digit, the first potential is equal to the filament voltage, a second potential higher than the filament potential is lower than the filament potential third potential, the fourth potential generated higher than the third potential lower than the filament voltage, when the phosphor emits light of a back substrate Is the second potential is applied to a selected anode electrode of the back substrate, the first to the non-selected anode
Apply a potential to the selected anode electrode on the front substrate .
When one potential is applied, a fourth potential is applied to the non-selective anode electrode, and when the phosphor on the front substrate emits light, the first potential is applied to the selected anode electrode on the rear substrate and applied to the non-selective anode electrode. A third potential is applied, a second potential is applied to a selected anode electrode on the front substrate, and a second potential is applied to a non-selected anode electrode.
By applying a third potential , the phosphors on the rear substrate and the front substrate emit light alternately.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011]

FIG. 1 is a cross-sectional view of a double-sided fluorescent display tube used for electric field analysis for explaining the principle of the embodiment of the present invention. Reference numeral 11 denotes a glass front substrate, and anode electrodes 121 to 123 coated with phosphors 131 to 133.
Is formed. Reference numeral 14 denotes a glass back substrate on which an anode electrode 15 coated with a phosphor 16 is formed. 17
1 to 173 are filaments whose electron emission is
The electrodes are arranged in a range that can be controlled by the anode electrodes 121 to 123 and the anode electrode 15. The width of both anode electrodes is 6 mm (the anode electrodes of the front substrate are 121 to 123
), The distance between the filaments 171 to 173 and the anode electrodes 121 to 123 and 15 is 0.7 mm, and the distance between the filaments 171 and 172 and 172 and 173 is 2 mm. In the case of FIG. 1, in consideration of the contact between the filament and the anode electrode and the control range between the anode electrodes, the interval between the filament and the anode electrode is
0.1 mm to several mm is preferable. Here, it is possible to increase the distance between the filament and the anode electrode by increasing the cutoff potential applied to the control electrode. However, considering the withstand voltage and cost of the driving IC, the The distance from the electrode is more preferably 0.5 mm to 1.5 mm . (0.00), (2.00), (4.0
0) indicates the position in the width direction of the anode electrodes 121 to 123, 15 and corresponds to the position of the filaments 171, 172, 173.

Continued on the front page (72) Inventor Hiroaki Kawasaki 629 Oshiba, Mobara-shi, Chiba Futaba Electronics Industry Co., Ltd. In-house F-term (reference) 5C036 EE04 EE14 EF03 EF05 EG15 EG24 EG25 EG26 EG48 EH01 EH26

Claims (7)

[Claims] A back substrate provided with an anode electrode coated with a phosphor, a front substrate formed with an anode electrode coated with a phosphor, and a filament provided between the back substrate and the front substrate; When the anode electrode of the front substrate is used as a light-emitting electrode, the anode electrode of the front substrate is used as a control electrode for electrons emitted from the filament to the light-emitting electrode, and when the anode electrode of the front substrate is used as the light-emitting electrode, the anode electrode of the rear substrate is used A double-sided fluorescent display tube characterized in that it is a control electrode for electrons emitted from a filament to a light-emitting electrode. (1) A back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. In a double-sided fluorescent display tube,
(2) generating a first potential equal to the filament potential (0 V), a second potential (12 V) higher than the filament potential, and a third potential (-25 V) lower than the filament potential;
(3) When emitting light from the phosphor on the rear substrate, a second potential (12 V) is applied to the anode electrode on the rear substrate, and a first potential (0 V) is applied to the selected anode electrode on the front substrate. When a third potential (-25 V) is applied to the selective anode electrode, and (4) when the phosphor on the front substrate emits light, a first potential (0 V) is applied to the anode electrode on the rear substrate to select the front substrate. A dual potential fluorescent display tube comprising means (5) for applying a second potential (12 V) to the anode electrode and applying a first potential (0 V) to a non-selected anode electrode. 3. A back substrate having an anode electrode coated with a phosphor, a front substrate having an anode electrode coated with a phosphor, and a filament provided between the back substrate and the front substrate. In a double-sided fluorescent display tube,
(2) a first potential equal to the filament potential (0 V), a second potential (12 V) higher than the filament potential, a third potential (-25 V) lower than the filament potential, a fourth potential lower than the filament potential and higher than the third potential ( -12 V), and (3) when the phosphor on the rear substrate emits light, a second potential (12 V) is applied to the selected anode electrode on the rear substrate.
, A first potential (0 V) is applied to the unselected anode electrode, a first potential (0 V) is applied to the selected anode electrode on the front substrate, and a fourth potential (−) is applied to the unselected anode electrode.
12V) (4) When the phosphor on the front substrate emits light, the first potential (0 V) is applied to the selected anode electrode on the rear substrate, and the third potential (-) is applied to the non-selected anode electrode.
(5V), a second potential (12V) is applied to a selected anode electrode on the front substrate, and a third potential (-25V) is applied to a non-selected anode electrode. Fluorescent display tube. (1) A back substrate on which an anode electrode coated with a phosphor is formed, a front substrate on which an anode electrode coated with a phosphor is formed, and a filament provided between the back substrate and the front substrate. In a double-sided fluorescent display tube,
(2) When the anode electrode on the rear substrate is used as a light emitting electrode, the anode electrode on the front substrate is used as a control electrode for electrons emitted from the filament to the light emitting electrode. When the anode electrode on the front substrate is used as the light emitting electrode, the back electrode is used. The anode electrode of the substrate is used as a control electrode for electrons emitted from the filament to the light-emitting electrode. (3) The anode electrode on the rear substrate and the anode electrode on the front substrate are used for controlling the emission of electrons emitted from the filament to the anode electrodes arranged opposite to each other. (4) The phosphor layer on the back substrate and the phosphor layer on the front substrate are arranged in a range in which electrons emitted from the filament can be controlled to the phosphor layers opposed to each other. And
(5) A double-sided fluorescent display tube characterized in that the anode electrode on the rear substrate is dynamically connected and the anode electrode on the front substrate is formed solidly for each digit. 5. A semiconductor device comprising: a back substrate on which an anode electrode coated with a phosphor is formed; a front substrate on which an anode electrode coated with a phosphor is formed; and a filament provided between the back substrate and the front substrate. In a double-sided fluorescent display tube,
(2) generating a first potential equal to the filament potential (0 V), a second potential (12 V) higher than the filament potential, and a third potential (-25 V) lower than the filament potential;
(3) When emitting light from the phosphor on the rear substrate, a second potential (12 V) is applied to the anode electrode on the rear substrate, and a first potential (0 V) is applied to the selected anode electrode on the front substrate. When a third potential (-25 V) is applied to the selective anode electrode, and (4) when the phosphor on the front substrate emits light, a first potential (0 V) is applied to the anode electrode on the rear substrate to select the front substrate. Applying a second potential (12V) to the anode electrode and applying a first potential (0V) to a non-selected anode electrode (5). 6. A back substrate having an anode electrode coated with a phosphor, a front substrate having an anode electrode coated with a phosphor, and a filament provided between the back substrate and the front substrate. (2) a first potential equal to the filament potential (0 V), a second potential (12 V) higher than the filament potential, a third potential (-25 V) lower than the filament potential, and a third potential lower than the filament potential. When generating a fourth potential (−12 V) higher than the potential and (3) emitting light from the phosphor on the rear substrate, a second potential (12 V) is applied to the selected anode electrode on the rear substrate.
, A first potential (0 V) is applied to the unselected anode electrode, a first potential (0 V) is applied to the selected anode electrode on the front substrate, and a fourth potential (−) is applied to the unselected anode electrode.
12V) (4) When the phosphor on the front substrate emits light, the first potential (0 V) is applied to the selected anode electrode on the rear substrate, and the third potential (-) is applied to the non-selected anode electrode.
25 V), a second potential (12 V) is applied to a selected anode electrode of the front substrate, and a third potential (-25 V) is applied to a non-selected anode electrode. (5) Driving method of light emitting fluorescent display tube. 7. A back substrate having an anode electrode coated with a phosphor, a front substrate having an anode electrode coated with a phosphor, and a filament provided between the back substrate and the front substrate. When the anode electrode of the rear substrate is used as a light emitting electrode, the anode electrode of the front substrate is used as a control electrode for electrons emitted from the filament to the light emitting electrode, and when the anode electrode of the front substrate is used as the light emitting electrode, the anode electrode of the rear substrate is used. The anode electrode is used as a control electrode for electrons emitted from the filament to the light-emitting electrode, and the anode electrode on the rear substrate and the anode electrode on the front substrate can control the electrons emitted from the filament to the anode electrodes arranged opposite each other. The phosphor layer on the back substrate and the phosphor layer on the front substrate are radiated from the filaments to the phosphor layers disposed opposite to each other. The anode electrode on the rear substrate is dynamically connected, and the anode electrode on the front substrate is solidly arranged for each digit. 0V)
, A second potential (12 V) higher than the filament potential, and a third potential (−2) lower than the filament potential.
5V), and a fourth potential (−12 V) lower than the filament potential and higher than the third potential is generated. (3) When the phosphor on the rear substrate emits light, the second potential ( 12V), a first potential (0 V) is applied to the unselected anode electrode, a first potential (0 V) is applied to the selected anode electrode on the front substrate, and a fourth potential (-) is applied to the unselected anode electrode. (4) When the phosphor on the front substrate emits light, the first potential (0 V) is applied to the selected anode electrode on the rear substrate, and the third potential (-25 V) is applied to the non-selected electrode. Applying a second potential (12V) to a selected anode electrode on the front substrate, and applying a third potential (-25V) to a non-selected anode electrode on the front substrate, (5)
A method for driving a double-sided light emitting fluorescent display tube.