JPH061675B2 - Fluorescent display tube - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fluorescent display tube with high brightness emission.

[Prior Art] For example, a large number of light emitting display cells each having a so-called phosphor trio composed of phosphor layers of three colors of red, green and blue are arranged side by side, for example.
There has been proposed a huge display device capable of obtaining a large screen having a length of 40 m and a length of 25 m.

As shown in FIGS. 28 and 29, this light emitting display cell has three colors of red, green and blue as surrounded by the carbon layer (3) on the inner surface of the front panel (1A) of the glass enclosure (1). Fluorescent layer
(2) [(2R), (2G), (2B)] is deposited and formed, and three wire cathodes (K) are provided facing the respective color phosphor layers (2R), (2G), (2B). [(K _R ), (K _G ),
_{(K B)]} and a first grid (control electrode) _(G 1)
[(G _1R ), (G _1G ), (G _1B )] and a common second grid (acceleration electrode) (G ₂ ) are arranged.

Each color phosphor layer (2R), (2G), and (2B) is surrounded by a separator (3), and an electron beam from each wire cathode (K) irradiates the corresponding phosphor layer (2). To be done. In this case, the anode terminal (5) that supplies the anode voltage to the fluorescent material layer (2) is a glass casing via the separator (3).
Derived from between the front panel (1A) and side plate (1C) of (1),
Each terminal (6) of the other cathode (K), the first grid (G ₁ ) and the second grid (G ₂ ) has a rear panel (1B) and a side plate (1).
It is derived from between C). In this light emitting display cell, the anode voltage is supplied to the phosphor layer (2) through the anode terminal (5), and the voltage of the anode side and the second grid (G ₂ ) is fixed to the first grid (G ₁ ). It is selectively turned on or off depending on the applied voltage.

[Problems to be solved by the invention]

The display device using the above-described light emitting display cell can obtain a huge screen, but is not suitable for obtaining a display device having a large screen of an appropriate size.

The present invention provides a light-emitting display cell, that is, a fluorescent display tube with high-luminance light-emission, which makes it possible to appropriately downsize a large-screen display device.

The present invention also provides a fluorescent display tube in which the display cells can be arranged close to each other when the display device is constructed.

[Means for solving problems]

The present invention is directed to a phosphor trio composed of phosphor layers of three colors of red, green, and blue, and arranged to face each phosphor layer of the phosphor trio, at least a cathode, and a control electrode ( Arranging a plurality of sets of electrode units as an electron beam source, which are composed of a first grid) and an accelerating electrode (second grid), and enclose them in one casing, and arrange the plurality of casings. In the fluorescent display tube for obtaining a large screen display device, a high voltage terminal for applying a high voltage to the housing is led out from the back side of the housing to the outside through an exhaust pipe.

[Action]

In the above structure, by sequentially operating the electrode units, the electron beam from the electrode units strikes the corresponding phosphor trio, and a plurality of sets of phosphor trios are sequentially emitted and displayed. Then, such a fluorescent display tube in which a plurality of picture elements, that is, a fluorescent trio is integrally incorporated is used as a single display cell, and a large number of the display cells are arranged by arranging a large number of the display cells. A display device is obtained.

Further, since the high voltage terminal is led out from the back side of the insulating casing through the exhaust pipe to the outside, the display cell and the display cell can be arranged sufficiently close to each other when forming a large screen. Therefore, even if the fluorescent trios are arranged at a narrow pitch even in the display cell, the fluorescent trios can be arranged on the entire screen at equal pitches of upper, lower, left and right.

〔Example〕

Hereinafter, embodiments of the fluorescent display tube according to the present invention will be described in detail with reference to the drawings.

FIG. 1, FIG. 2 and FIG. 3 show a front view, a side view and a perspective view, respectively, showing a fluorescent display tube of the present invention, that is, a unit cell, with one part broken away.

In the figure, (11) is a front panel (11A) and a rear panel (11A).
The glass enclosure consisting of B) and the side plate (11C) is shown. This glass enclosure (11) is, for example, 41m long on the front panel (11A).
It is formed in the size of m × width 86 mm. This glass case (1
1) a fluorescent display section which is a plurality of pairs of picture elements each consisting of a fluorescent layer, that is, eight sets of so-called fluorescent trio (12) [(12
a), (12b), (12c), (12d), (12e), (12f), (12g), (12h)], and 8 sets of electrode units corresponding to each of the fluorescent trio (12). (13) [(13
a), (13b), (13c), (13d), (13e), (13f), (131g), (13h)] are arranged facing each other.

Eight sets of fluorescent trios (12) are formed by applying a fluorescent layer to the inner surface of the front panel (11A), and four sets of each are placed above and below 2
Arranged in rows, in which case each phosphor trio (12) has three phosphor layers (14R), (14R) that emit red, green and blue.
G), (14B). Specifically, as shown in FIG. 8, a carbon layer (15), which is a conductive layer, is printed in a frame shape on the inner surface of the front panel (11A), and each of the red fluorescens corresponding to each void in the frame shape. The phosphor layer (14R), the green phosphor layer (14G), and the blue phosphor layer (14B) are formed by printing so as to partially extend over the carbon layer (15), and an intermediate film is provided on the front surface thereof. A metal back layer (1
6) is deposited. In this case, in the phosphor trio (12), the red phosphor layer (14R) is arranged at the center, and the green phosphor layer (14G) and the blue phosphor layer (14B) are arranged at both ends. In particular, the green phosphor layer (14G) and the blue phosphor layer (1
4B) are arranged on the left and right side by side (see Fig. 10).

An electrode unit (13) is arranged on the rear panel (11B) side so as to face each of the phosphor trios (12). This electrode unit (12) includes a red phosphor layer (14R), a green phosphor layer (14G) and a blue phosphor layer (14) of a phosphor trio (12).
3 wire cathodes (K) facing B)
[(K _R ), (K _G ), (K _B )] and three wire grids (K _R ), (K _G ), and (K _B ), each of which faces three first grids (G ₁ ) [ (G _1R ), (G _1G ), (G _1B )]
Are arranged, and further, the second grid (G ₂ ) is arranged commonly to the three first grids (G ₁ ).

The specific assembly and configuration of this electrode unit (13) is the fourth
This is as shown in FIGS. That is, as shown in FIG. 4, it has three square openings (17), and each opening (17)
An insulating substrate, for example, a ceramic base (19) having a pair of terminal pins (18a) and (18b) penetratingly planted is provided at a position sandwiching. The E-shaped conductive support pieces (20a) and (20b) paired with the terminal pins (18a) and (18b) of this pair are spot welded in common, that is, one of the conductive support pieces (20
a) is commonly spot-welded to the three terminal pins (18a) of one row, and the other conductive support piece (20b) is commonly spot-welded to the three terminal pins (18b) of the other row. , each conductive support piece (20a) and (20b) each wire cathode between _{(K G), (K R} ), (K B) is stretched. One support piece (20a) fixes one end of the wire cathode (K), and the other support piece (20b) is provided with a spring portion (21) having a bent tip. ), The other end of each wire cathode (K) is fixed. As a result, even if the wire cathode (K) expands due to temperature rise, the expansion is absorbed by the spring portion (21) and the wire cathode (K) does not loosen. (22) is a terminal led out from the support piece (20a). Each wire cathode (K) is formed, for example, by coating a surface of a tungsten heater with a carbonate serving as an electron emitting substance.

Next, the first grids (G _1G ), (G _1R ) (G _1B ) are supported by the openings (17) of the ceramic base (19). Each first grid (G _1G ), (G _1R ),
(G _1B ) is each wire cathode (K _G ), (K _R ), (K
_B ) is formed in a curved semi-cylindrical shape so as to have a cylindrical surface so as to face the cylindrical surface, and a large number of slits (23) are provided at a predetermined pitch along the longitudinal direction on the cylindrical surface. Legs (24) and (25) each having a width substantially equal to the width of the opening (17) are provided. The legs (24) and (25) are inserted into the opening (17) of the ceramic base (19), but at this time, the legs (24) and (25) are inserted so as to be sandwiched in the opposite direction. As a result, the force to return to both legs of the insertion portion causes the legs (24) and (25) to come into pressure contact with the inner wall of the opening (17), thereby providing temporary support. One leg (24) is long because it is used as a terminal, and the other leg (25) is formed short, so that one leg (2) is inserted in the opening (17).
4) penetrates the opening (17), and the other leg (25) stops in the opening (17).

On the other hand, the casing (26) of the electrode unit is provided. The housing (26) constitutes a part of the second grid (G ₂ ), is made of a conductive material, and has three openings (27) [(27G) facing the first grid (G ₁ ) on the front surface. ), (27R), (27
B)] is provided, and a separator (28) for partitioning the openings (27) from each other is integrally extended inward. This casing (26) is made by drawing and barrel-polished, so that it is difficult to discharge. The common second grid (G ₂ ) is inserted and arranged in the housing (26). The second grids (G ₂ ) are the first grids (G _1G ) G _1R ), (G _1B ).
The slit (2) of the first grid (G ₁ ) at the part corresponding to
At the same position as 3), the slit mesh part (29
G), (29R), and (29B). In this case, a groove (30) through which the separator (28) is inserted is provided between the mesh portions (29G), (29R), (29B).
The slits (29G), (29G), (29B) face the openings (27G), (27R), (27B) and the groove (3
The second grid (G ₂ ) is placed in the casing (26) by inserting the separator (28) into the (0). The second grid (G ₂ ) is spot-welded to a part of the housing (26) and is mechanically and electrically connected to the housing (26). It will also serve as 2 grids (G ₂ ).

Next, a pair of insulative separators (31A) and (31B) are inserted along one of the facing inner wall surfaces of the casing (26). The inner surfaces of the separators (31A) and (31B) are provided with three groove portions (32) [(32G), (32R), (32B)] into which the side portions of the first grid (G ₁ ) can be fitted. ing. (33) is a through hole. This separator (31A), (3
When 1B) is inserted into the housing (26), it is inserted into the gap between the wall of the housing (26) and the separator (28) and is held by being held. The upper ends of the separators (31A) and (31B) are in contact with the second grid (G ₂ ).

Then, the ceramic base (in which the wire cathode (K) and the first grid (G ₁ ) are attached in the casing (26) in which the second grid (G ₂ ) and the separators (31A) and (31B) are assembled in this way ( 17) with a separator (31
Inserted so that the rear end faces of (A) and (31B) are in contact with each other. At this time, the first grids (G _1G ), (G _1R ), (G ₁
Both ends of _1B ) are fitted into the grooves (32G), (32R) and (32B) of the separators (31A) and (31B), respectively. Therefore, in each first grid (G ₁ ), the legs (24) and (25) of the first grid (G ₁ ) are inserted into the openings (17) of the ceramic base (19), and both sides of the first grid are separated by the separator (31 A). , (31
Positioning is accurately performed by fitting the groove (32) of B). In addition, a terminal (2) bent and extended from one supporting piece (20a) on which the wire cathode (K) is stretched.
2) is passed between the ceramic base (19) and the separator (31a) and led out to the outside through the notch of the housing (26).
Next, one of the retainer structures (34) made of a conductive material is used.
Two frame-shaped retainers (34A) are fitted in the case (26), and the bent portion (34a) of the retainer (34A) and the case (26)
The ceramic base (19) is held by spot welding to form the electrode unit (13) shown in FIGS. 5 to 7.

As shown in FIG. 4, the conductive retainer structure (34) includes retainers (34) that can be inserted into the casings (26) of four sets of electronic units.
A), (34B), (34C), and (34D) are integrally connected to each other by a conductive connecting part (35), and this connecting part (35) is exactly in the notch (36) of the housing (26). Configured to mate.
(36) An attachment portion spot-welded to a lead frame (not shown), and (37) an attachment portion attached to the glass casing (11). Therefore, the second grids (G ₂ ) of the four sets of electrode units (13) are electrically commonly connected to each other by the conductive retainer structure (34).

On the other hand, each color phosphor layer (14R of 8 pairs of phosphor trio (12))
A separator structure (40) made of a conductive material as shown in FIG. 9 is arranged so as to surround P), (14G) and (14B). The separator structure (40) prevents the electron beam from the wire cathode from striking the first grid (G ₁ ) and the second grid (G ₂ ) so that secondary electrons from the second grid (G ₁ ) do not emit light to the adjacent phosphor layer. It also has the function of spreading the electron beam from each wire cathode (K) so that the electron beam from each wire cathode (K) is irradiated to the entire corresponding phosphor layer (14), that is, forming a so-called diffusion lens. ,
At the same time, it is used as a power supply means for applying a high voltage, for example, 8 KV, to each fluorescent trio (12). This separate structure (40) is a glass housing (11) when assembled.
Supported between the front panel (11A) and side plate (11C) of
Fixed by a glass frit. That is, the separator structure (40) has a separator part (41) divided into three parts so that each color phosphor layer is surrounded by each of eight sets of the phosphor trio (12). The (41) is integrally connected to each other via the electrode plate (42), and the upper ends thereof are provided with supporting claws (43) protruding outward, respectively. Further, elastic bending pieces (44) for positioning are cut and raised on the side portions of the separator structure (40). Therefore, when the separator structure (40) is inserted into the side plate (11C) of the glass frame (11) from above, the supporting claw (43) just comes into contact with the upper end surface of the side plate (11C) and the separator structure (40). At the same time, the bending piece (44) is brought into contact with the inner wall of the side plate (11C) to hold the separator structure (40) at a predetermined position. Further, a protrusion (45) (see FIG. 8) is provided on a portion of the separator structure (40) corresponding to the electrode plate, and the protrusion (45) accommodates the separator structure (40) in the side plate (11C). Side plate (11
When the front panel (11A) is overlaid and sealed on C), it just contacts the metal back layer (16) or the carbon layer (15). This causes the high voltage terminal or anode lead (46) to commonly supply the high voltage fluorescent trio (12). As shown in FIG. 8, one end of the anode lead (46) to which a high voltage is applied is connected to the electrode plate (42) of the separator assembly (40) and the other end thereof is a glass back panel (11B). ) It is led out through the attached exhaust pipe (47). At this time, anode lead (46)
Is a Dumet wire (Cu alloy) wound around the exhaust pipe (47) with glass. Therefore, the airtightness between the anode lead (46) and the exhaust pipe (47) is maintained. A high pressure cover (48) is fixed to the outside of the exhaust pipe (47) via an adhesive (49), and an anode lead (46) is soldered to an external terminal plate (50) provided on the high pressure cover (48). Attached. The external lead (52) is electrically connected to the terminal plate (50) via the spring (51), and the high-voltage cover (48) is detachable, for example, a cover (5) made of silicon rubber.
3) protected by.

In the electrode unit (13), eight sets of electrode units (13a) to (13d) each have a common retainer structure (34).
After being fixed by, the lead frame (60) is placed at a predetermined position, and the mounting portion (36) of the retainer structure (34) and the lead frame (60) are spotted. After that, the terminal pin (18) of the wire cathode (K), the leg portion (24) of the first grid (G ₁ ) and the electrode units (13a) to (13).
For example, a lead wire (not shown) is provided between the lead portions of a predetermined lead frame corresponding to the d) side retainer structure (34).
Connected via. At this time, as described above, the second grid (G ₂ ) is composed of four pairs of the electrode units (13a) to (13d) arranged in the lateral direction and the second grid (G ₂ ) and the fourth grid.
The second grid (G) of the pair of electrode units (13e) to (13h)
₂ ) Comrades are commonly connected by the retainer structure (34). The first grid (G ₁ ) is located between two electrode units arranged in each longitudinal direction, that is, the electrode units (13a) and (1
3e), between electrode units (13b) and (13f), between electrode units (13c) and (13g) and between electrode units (13d) and (13).
h) are commonly connected. That is, between vertically arranged electrodes unit, the center of G _1R comrades are commonly connected, the right end of the (G _1B) (G _1G) are commonly connected, the left end of the (G _1G) (G _1B) And are commonly connected. Furthermore, the wire cathodes (K) are connected in series in this example.

The lead of the wire cathode (K), the lead of the first grid (G ₁ ) and the lead of the second grid (G ₂ ) are respectively sealed between the rear panel (11B) and the lower end surface of the side plate (11C). It is led to the outside through the section.

(61F) is a wire cathode lead, (62G ₂ ) is a second grid (G ₂ ) lead commonly connected between the electrode units (13e) to (13h), and (63G ₂ ) is an electrode unit (13a).
The lead of the second grid (G ₂ ) commonly connected between (13d) and (64G ₁ ) of the three first grids (G ₁ ) commonly connected between the electrode units (13a) and (13e). Leads, (65G ₁ ) are leads of three first grids (G ₁ ) commonly connected between the electrode units (13b) and (13f),
(66G ₁ ) is the lead of the three first grids (G ₁ ) commonly connected between the electrode units (13c) and (13g), (67G ₁ )
G ₁ ) is the lead of the three first grids (G ₁ ) commonly connected between the electrode units (13d) and (13h).

The electrode units (13a) to (13d) and the electrode units (13e) to (13h) held by the retainer structure (34).
When attaching the glass enclosure (11), the retainer structure (34) is provided with mounting portions (37) at both ends of the rear panel (11B) and side plates (11C).
It is fixed so that it is sandwiched between them. In this case, since the retainer structure (34) holding the four sets of electrode units is fixed because it is fixed only at both ends, the electrode units may be displaced from a predetermined position. To prevent this, as shown in FIG. 11, a common L-shaped auxiliary member (68) is integrally provided on the side surface of the four sets of electrode units, and both ends of this auxiliary member (68) are also attached. It can also be fixed between the rear panel (11B) and the side plate (11C) via the part (69). At this time, the auxiliary member (68) is made of a conductive material. The auxiliary member (68) prevents the retainer structure (34) from warping and tilting and prevents the electrode unit (13) from being displaced. Further, as shown in FIG. 12, scattering of getter particles from the getter container (70) to the fluorescent surface side is restricted. Further, the auxiliary member (68) is provided with the same potential as that of the second grid (G ₂ ) to prevent discharge. That is, the auxiliary member (68) prevents the anode electric field from seeping out to the low voltage side, the separator structure (40) to which the anode voltage is applied, and the leads and cathodes of the low voltage side grids (G ₁ ) and (G ₂ ). Discharge between (K) and the lead is blocked.

Next, the operation of such a configuration will be described. Each fluorescent trio (12)
Red, green and blue color phosphor layers (14R) (14G) (14B)
An anode voltage of, for example, about 8 KV is supplied to each of the first grids (G _1R ) through the anode lead (46).
A voltage of, for example, 0 to 5 V or less is applied to each of (G _1G ) and (G _1B ), and for example, −15 V is applied to the second grid (G ₂ ).
A voltage of 50 V (so-called column selection voltage) is applied.

In this configuration, the voltage on the anode side is fixed, the column is selected by the voltage applied to the second grid (G ₂ ), and the on / off display is selectively performed by the voltage applied to the first grid (G ₁ ). It is something. That is, for example, when 50 V is applied to the second grids (G ₂ ) of the upper row electrode units (13a) to (13d), the lower row electrode units (13
When a cutoff voltage of, for example, −15V is applied to the second grid (G ₂ ) of e) to (13h), a voltage of 5V is applied to the first grid (G ₁ ) through the lead (64G ₁ ). The first phosphor trio (12a) is selected, and the electron beam from the cathode (K) in the electrode unit passes through the first grid (G ₁ ) and is accelerated by the second grid (G ₂ ) to generate the corresponding fluorescence. Strike the body layers (14R) (14G) (14B) to make them emit light. At this time, the emission brightness is controlled by controlling the panel width (application time) of the voltage (5 V) applied to the first grid (G ₁ ).

Then, when 0 V is applied to the first grid (G ₁ ), the electron beam from the gas is cut off and the corresponding phosphor layer is not luminescently displayed. And lead (64
G ₁ ) (65G ₁ ) (66G ₁ ) and (67G ₁ )
By applying a voltage to the grid (G ₁ ), the fluorescent trios (12a) to (12d) in the upper row are luminescently displayed, and then the voltage of the second grid (G ₂ ) is switched to the second grid (G ₁ ) in the lower row. _When 50V is applied to ₂ ) and the voltage of the first grid (G ₁ ) is applied in the order of leads (64G ₁ ) to (67G ₁ ), the fluorescent trios (12e) to (12h) in the lower row are illuminated and displayed. It

The electron beam from the wire cathode (K) is spread by the first grid (G ₁ ) and the separator (41) and is applied to the entire surface of the phosphor layer (14).

Further, the wire cathode (K) electron beam first grid _(G 1) from, per the second grid _{(G 2),} first grid _(G 1), second secondary electrons from the grid _{(G 2)} Is generated, but these secondary electrons are the second grid case (26)
Separator (28) and anode side separator (41)
It is not blocked by and hits the adjacent fluorescent layer. In this way, by selectively controlling the voltages of the first grid (G ₁ ) and the second grid (G ₂ ), each phosphor trio (12) is sequentially luminescent-displayed with high brightness.

A plurality of the fluorescent display cells (71) as described above are assembled in a unit case to form one unit, and a large screen display device is formed by arranging a plurality of these units.

In this fluorescent display cell (71), eight picture elements, that is, the phosphor trio (12) are compactly built in one cell, and therefore the picture elements are downsized as a whole.

Also, three wire cathodes (K) and a first grid (G
The common second grid (G ₂ ) of ( ₁ ) is unitized so that its unit casing (26) also serves as the second grid (G ₂ ), and this electrode unit (12) is made into each phosphor trio (1).
Since it is arranged corresponding to 2), such display cell (7
Assembling and manufacturing of 1) is easy. The second grid (G
_{Since the} unit housing (26) that also serves as ₂ ) is made by so-called drawing, the corners are rounded and the discharge withstand voltage increases,
Accidents due to discharge are prevented.

In addition, in the electrode unit (13), each first grid (G ₁ ) does not use spot welding or the like, and the opening (17) provided in the ceramic base (19) and the insulating separator (31).
Since it is positioned and supported by the groove portions (32) of (A) (31B), the electrode unit (13) can be assembled in a sufficiently small size.

Further, when a large screen is formed by arranging a large number of display cells (71), the fluorescent trio (12) on the fluorescent surface is moved upward, downward, left,
The right display cells (7
Almost no gap can be made between 1) and the display cell (71). However, in this display cell (71), the anode lead (46) is located in the exhaust pipe (4) from the rear panel (11B) side of the glass casing (11).
Since it is derived through 7), the adjacent display cells (71)
Can be placed close to each other.

Furthermore, in 8 sets of fluorescent trio (12) on the fluorescent surface, red fluorescent layer (14R) is arranged in the center and green and blue fluorescent layers (14G) and (14B) are arranged on both sides. However, the apparent resolution can be increased by changing the arrangement of the green and blue phosphor layers (14G) and (14B) between the upper row and the lower row.

In the above example, eight sets of fluorescent trio were arranged, but the number of sets is not limited to this and can be selected as appropriate.

Further, in the above example, the wire cathodes (K) in the eight sets of electrode units (13) are directly connected to each other, but it is also possible to make a parallel connection as shown in FIG. 14, for example. Even if the wire cathode of one electrode unit is broken, the operation of the other electrode unit is maintained.

Further, the respective terminals of the electrode unit and the lead frame can be connected by a method of directly connecting the two without using lead wires. Particularly in the case of the wire cathode (K) terminal, the terminal (22) of the supporting piece (20a) can be bent and extended and directly connected to the lead frame.

In the electrode unit (13) of the above example, the terminal pins (18a) and (18b) are planted in the ceramic base (19). For example, as shown in FIG. 19 and FIG.
It is also possible to omit a) and (18b). In FIGS. 19 and 20, through holes (for supporting the pair of conductive support pieces (20a) and (20b) at positions sandwiching the three openings (17) for supporting the first grid (G ₁ ) respectively. 83a) and (83b)
A ceramic base (19) is formed. On the other hand, as a pair of conductive support pieces (20a) and (20b), support parts (84G) (84R) to which each wire sword is attached are attached.
(84B) are connected to each other, and the rear end (85R) that serves as the lead of the central support portion is extended, and the rear ends (85G) and (85B) of both support portions (84G) and (84B) are It is folded back to have elasticity. Although the support portions (84G) (84R) (84B) of one conductive support piece (20a) are configured as fixed support portions, the other conductive support piece (20
The supporting portions (84G) (84R) (84B) of b) are formed as spring portions (21 ') as a whole by forming cuts in the base portion. (86) is the conductive support pieces (20a) and (20
It is the fall prevention part of b). Support part (84G) (84R) (84B)
End each wire cathode _{(K G (K R) (} K B) is stretched is made with bent shape with a notch to allow the center out of the wire cathode (K) is. This Insert both support pieces (20a) and (20b) into through holes (83a) and (8
3b) and folded back ends on both sides (85G) (85B)
Support pieces (20a) and (20b) with ceramic base (19)
Then, the wire cathodes (K _G ) (K _R ) (K _B ) are stretched between the support pieces (20a) and (20b). At this time, it is led out by penetrating each lead (85R) or the ceramic base (19). According to this configuration,
The terminal pins (18a) (18b) can be omitted and the electrode unit (1
It is possible to reduce the number of parts that make up 2).

In the above example, the separator structure (40) on the anode side is held by sandwiching the supporting claw (43) between the front panel (11A) and the side plate (11C) of the glass casing (11). In this case, the claw (43) is about 1/2 of the plate thickness of the substrate (11C), but when it is necessary to further increase the pressure resistance between the tip of the claw (43) and the outer surface of the glass case. For example, as shown in FIG. 13, a glass plate (72) is further placed inside the side plate (11C) of the glass housing (11), and the glass plate (7
It can be configured to hold the claw (43) of the separator structure (40) between the front panel (11A) and the front panel (2).

Further, in order to hold the separator structure (40), the supporting claw (43) may be omitted, and the separator structure (40) may be directly fixed to the front panel (11A) of the glass casing (11) with frit glass. At this time, since the supporting claw (43) is omitted, the discharge with the outside of the glass casing and the discharge within the glass casing, that is, the so-called creeping discharge along the side plate (11C) is surely prevented. At this time, on the front panel (11A) side, the carbon layer (15) and the metal back layer (16) are not formed in the portion where the frit glass is bonded. When the display device is configured, the front surface of the glass housing (11) is covered with a frame body for shielding external light except for the fluorescent trio, so that the frit glass portion is hidden.

Also, in the above example, the mesh part (29G) of the second grid G ₂
(29R) and (29B) are slit-shaped, but in this case, the slit has a large opening in the longitudinal direction, so that
As shown in the figure, the entry of a high electric field (80) may cause the electron lens to be constructed. On the other hand, if the mesh part (29G) (29R) (29B) is made into a fine turtle shape as shown in Fig. 17, the entry of high electric field is eliminated (see Fig. 18),
No electron lens is formed.

Also, in the above example, the voltage of the second grid (G ₂ ) is switched to select the column, but in addition, for example, the wire cathode (K)
It is also possible to select the column by switching. in this case,
As shown in FIG. 27, the wire cathodes (K) of the electrode units (13a) to (13d) are commonly connected, and the wire cathodes (K) of the electrode units (13e) to (13h) are commonly connected. During operation, the commonly connected wire cathodes (K) in the upper row and the lower row are turned on, and a drive voltage of, for example, 0 V to 5 V or less is applied to each wire cathode as a column selection voltage, and the first grid (G ₁ ) 0V to 5
A drive voltage of V or less is applied, and 10 V is commonly applied to the second grid (G ₂ ) of each electrode unit (13a) to (13h).
The following fixed voltages are provided. Therefore, for example, 0 V is applied to the wire cathodes (K) of the upper row electrode units (13a) to (13d), and the lower row electrode units (13e) to (13h).
Of the wire cathode (K) of the cutoff, for example, 5V, and the lead (64G ₁ ) through the grid (G).
_When , for example, 5 V is applied to ₁ ), the first fluorescent trio (12a) is lit and displayed. 0 for the first grid (G ₁ )
When V is applied, the electron beam is cut off and the corresponding phosphor layer does not emit light. And lead (64
_{G 1) (65G 1) (} 66G 1) and (67G ₁₎ through the order as soon as one grid (G ₁₎ to the voltage on the column phosphor trio by applying a (12a) ~ (12d) is a light-emitting display, Next, the drive voltage of the wire cathode (K) is switched and 0 V is applied to the wire cathode (K) in the lower row, and leads (64G ₁ ) to (67G ₁ ) are similarly read.
When the voltage 5V of the first grid (G ₁ ) is applied in sequence, the fluorescent trios (12e) to (12h) in the lower row are luminescently displayed.
In this case, the configuration in common connecting the second grid (G ₂₎ to one another in each electrode unit (13a) ~ (13h) is taken. For example, as shown in FIG. 21 and FIG. 22, a common conductive auxiliary member (68) is provided, and this auxiliary member (68) is a retainer structure (34) of each electrode unit (13a) to (13h).
Spot welded to. Alternatively, although not shown, the notch portion of each electrode unit housing (26) when the notch (86) is formed is bent, and the auxiliary member (68) is spot-welded to this bent portion to form each second grid ( G ₂ ) are commonly connected.

Figures 23 and 24 are another embodiment of the invention having two sets of phosphor trios.

In this example, the front panel (11A) is 39 mm long and 86 mm wide.
2 sets of electrode units (90) [(90a), (90b)] are placed in the glass enclosure (11) of the size of, and the front panel (11A) is placed so as to face these electrode units (90). Two sets of fluorescent trio (12) [(12a), (12b)] are arranged on the inner surface. On the fluorescent surface side, each color fluorescent layer (14R) of each fluorescent trio (12), (14G), (14
A separator structure (4
0) is placed.

In this case, an electrode unit (90), a unit case (26) obtained by spot welding a second grid (G ₂ ) having fine mesh-shaped mesh parts (29B) (29R), (29G), Three
Three first wire grids (G _1B ), (G _1R ), (G _1G ), and three wire cathodes (K _B ) (K _R ) suspended between a pair of conductive support pieces (20 a) and (20 b). ) (K _G ). And the second
Unit enclosure (26) that forms part of the grid (G ₂ ).
The first grid (G ₁ ) and the pair of support pieces (20a) and (20b) are directly attached to the lead frame (60) arranged on the inner surface of the rear panel (11b) of the glass housing (11). It is spot welded and supported electrically and mechanically.

In the E-shaped conductive support piece (20) for supporting the wire cathode (K), one has a fixed support piece (20a) and the other has a spring portion (21 ') as shown in FIG. The support piece (20b) is made. End support piece (20a) each wire cathode _{(K B)} of (20b) (K R) ( K G) is stretched, the center out of the wire cathode (K) has a notch for perform It is made into a bent shape.

On the other hand, in this example, a conductive getter container (70) electrically and mechanically supported on a part of the separator structure (40) is arranged at a position near the front panel (11A).
The anode lead (46) is connected to 0).

Further, regarding the holding of the separator structure (40), the supporting claw (43) is omitted, and the separator structure (40) is directly fixed to the front panel (11A) of the glass housing (11) with the frit glass (81). It That is,
An opening (80) is provided in the electrode plate of the separator assembly (40), and an extension (82) extending from the electrode plate to this opening (80).
The front panel (11A) is fixed with the frit glass (81). In this case, on the front panel (11A) side, the carbon layer (15) and the metal back layer are not formed in the portion where the frit glass (81) is bonded. Therefore, the pattern of the carbon layer (15) is formed as shown in FIG. Further, a plurality of cut and raised portions (83) are integrally provided from the side of the opening (80) of the separator structure (40) and elastically folded back to form the metal back layer (16) and the carbon layer (15).
The cut-and-raised part (83) electrically connects the fluorescent surface to the separator structure (40). When the surface device is constructed, the frit glass portion is hidden because the front surface of the glass housing (11) is covered with a frame body for shielding external light except for the fluorescent trio. Thus, when the separator structure (40) is directly fixed to the front panel (11A) of the glass housing (11), the supporting claws (43) are omitted, so that the outside of the glass housing is secured as described above. Discharge and so-called creeping discharge along the inner surface of the side plate (11C) in the glass enclosure are prevented. The method of holding the separator structure (40) and the contact between the separator structure (40) and the fluorescent surface can be applied to the examples of FIGS. 1 and 2 described above. And
A large-screen display device can also be obtained by arranging a large number of display cells (71 ') shown in FIGS. 23 and 24.
When the display cells (71 ') are arranged, the apparent resolution is improved by arranging the green and blue phosphor layers (14G) and (14B) in the left and right directions for each column (horizontal line) as described above.

〔The invention's effect〕

According to the above-described present invention, a miniaturized high-luminance luminescent fluorescent display tube, that is, a display cell, in which a plurality of groups of phosphor trio to be picture elements and corresponding electrode units are incorporated in a single cell, is provided. can get. Therefore, by arranging a large number of the display cells, it is possible to obtain a large-screen display device that is downsized to a practical level.

In this display cell, the high-voltage terminal for applying a high voltage to the fluorescent trio is led out from the back side of the insulating housing through the exhaust pipe, so that the display cell and the display cell are sufficiently separated when forming a large screen. Can be placed in close proximity.
Therefore, it is possible to obtain a display device in which the phosphor trios are arranged at a narrow pitch in the display cell, but the phosphor trios are arranged at the upper, lower, left, and right pitches in the entire screen at the same pitch.

[Brief description of drawings]

1 and 2 are a plan view and a side view with a partially broken view showing an embodiment of a fluorescent display tube according to the present invention, and FIG.
FIG. 4 is an exploded perspective view of the electrode unit, FIG. 5 is a plan view of the electrode unit, FIG. 6 is a sectional view taken along the line AA of FIG. 5, and FIG. FIG. 8 is a cross-sectional view taken along the line BB of FIG. 8, FIG. 8 is an enlarged cross-sectional view of the main part of FIG. 2, FIG. 9 is a perspective view of the separator structure on the anode side, and FIG. 10 shows the arrangement state of the fluorescent trio. FIG. 11 is a plan view showing a perspective view showing another embodiment of a plurality of electrode unit parts connected according to the present invention,
FIG. 12 is a sectional view showing an arrangement portion of a getter container, FIG. 13 is a sectional view showing another embodiment of the present invention, FIG. 14 is a diagram showing another example of a cathode connecting method, and FIG. 16 and FIG. 16 are plan views and C of the second grid G ₂ used for explaining the present invention.
FIG. 17 is a plan view of a main part showing another example of the second grid G ₂ , FIG. 18 is a cross-sectional view thereof, and FIGS. 19 and 20 show a wire cathode of an electrode unit. An exploded view and a cross-sectional view showing another example of the support structure, FIGS. 21 and 22 are a plan view and a cross-sectional view showing another example of the connection structure of the electrode units,
23 and 24 are partially cutaway plan and side views showing another embodiment of the fluorescent display tube according to the present invention, FIG. 25 is a plan view showing the pattern of the carbon layer, and FIG. 26 is FIG. 27 is a perspective view showing an example of a wire cathode support piece, FIG. 27 is a diagram showing another example of a cathode connecting method, and FIGS. 28 and 29 are plan views and cross sections showing examples of conventional display cells. It is a figure. (11) glass enclosure is (12) [(12a) ~ (12h)] is fluorescers trio, (13) [(13a) ~ (13h)] is the electrode _unit, (K G) _(K R) (KB) is the wire cathode, (G _B
1G ) (G _1R ) (G _1B ) is the first grid, (G ₂ ) is the second grid
Grid, (17) ceramic base, (26) electrode unit housing, (31A) (31B) insulating separator, (4
6) is an anode lead, and (47) is an exhaust pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Kakura 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (56) References Japanese Patent Publication No. 47-45699 (JP, B1)

Claims (1)

[Claims] 1. A phosphor trio composed of phosphor layers of three colors of red, green and blue, and a phosphor trio arranged to face each phosphor layer of the phosphor trio, at least a cathode and a control. An electrode and an electrode unit as an electron beam source composed of an accelerating electrode,
A fluorescent display tube in which a plurality of sets are arranged and housed in one housing, and a large-screen display device is obtained by arranging the plurality of housings. A fluorescent display tube for applying a high voltage to the housing. A fluorescent display tube, wherein a high-voltage terminal is led out from the back side of the casing through an exhaust pipe.