JPS6032238A - Phosphor display device - Google Patents

Abstract

PURPOSE:To obtain a display device in the thin constitution and having stable and highly bright luminance by providing the plural cathodes arranged corresponding to plural phosphor display segments and plural control electrodes together with a common acceleration electrode. CONSTITUTION:Anode voltage, for instance, of about 10kV is supplied to the phosphor display segments 2R, 2G and 2B of the respective colors red, green and blue through an anode lead wire 12 while impressing voltage, for instance, of 300V on the second grid. Luminous brightness can be controlled by selectively displaying ''ON'' and ''OFF'' according to the voltage given to the first grid G1 while controlling pulse length of the voltage to be impressed to the first grid G1. The electron beam from the cathode K is widened by a separator 10 for being radiated on the whole surface of the display segment 2. Thereby, the respective segments 2R, 2G and 2B are selectively illuminated to perform display with high brightness.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a high-intensity fluorescent display device.

BACKGROUND ART AND PROBLEMS Attempts have been made to develop a large display device in which a large number of light emitting display cells are arranged to obtain a large white surface.

In this case, it is desired that each light-emitting cell be constructed thin as a whole and that stable high-intensity light emission be performed.

OBJECTS OF THE INVENTION In view of the above-mentioned problems, the present invention provides a novel fluorescent display device that is thin and emits stable, high-luminance light.

Summary of the Invention The present invention comprises a plurality of fluorescent display segments to which a high voltage is applied, a plurality of cathodes and a plurality of control electrodes (first Gliso 1ζ) disposed corresponding to each segment, and a liquid crystal display between the segments and the control electrodes. This is a fluorescent display device having a common accelerating electrode (second grid) arranged in the grid, and selectively emitting light from each segment i by controlling the voltage of each control electrode.

The fluorescent display device of the present invention has a thin structure and can provide a stable display with 1lli brightness.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a fluorescent display device according to the present invention will be described in detail with reference to the drawings.

1, 2, 3 and 4 are a front view 1 showing a fluorescent display device of the present invention, particularly a unit cell thereof, and an A-A thereof.
A cross-sectional view on the line, a cross-sectional view on the line B-B, and a partially broken Ij
A perspective view of i is shown. In the figure, (11 is the front panel (
A glass tube consisting of a back plate (IA), a back plate (IB), and a lateral root (IC) is removed, and a plurality of fluorescent display segments (2) [(2R), (2G
), (2B)) and a plurality of cathodes (10((KR), (K c ), (Ks)) corresponding to each display segment.
and the first grid (control electrode> (Gs) ((GI
R), (G tc ), (GIB)) and a common second grid (acceleration electrode) (G2) is arranged. The fluorescent display segment (2) is formed by coating the inner surface of the front panel (18) with a fluorescent layer, and in this case, there are three fluorescent display segments of red light emission, green light emission, and blue light emission. (2R), (2
G), (2B) are formed. Specifically, as shown in Fig. 5, a carbon layer (3), which is a conductive layer, is printed in a frame shape on the inward side of the front panel (IA), and each display segment is printed in correspondence to each blank space within the rod shape. Each red phosphor layer (2R
), green phosphor layer (2G) and blue phosphor layer (2B)
is formed by printing so as to partially straddle the carbon layer f31 J, and the intermediate 1!1lft41
For example, a metal back layer made of aluminum (
5) is deposited and formed. Wire cathodes (
KR), (Kc), (KB) and their respective wire cathodes (
First grids (GIR), (GIG), (01s) are arranged opposite KR), (Kc), and (KB), respectively, and three first grids (GIR), (Gzc), and (G1
e), a second grid G2 is arranged in common. Each wire cathode (I()) is formed, for example, by coating the surface of a tungsten heater with carbonate, which serves as an electron-emitting substance.

Each wire cutter 1-(KR), (Kc), (KR) is stretched between a pair of conductive supports (6), (7) arranged on both sides of the back panel (IB), respectively. One support part (6)
is for fixing one end of the i-twiya cathode, and the other support part (7) is provided with a spring part (7a), and each wire cathode (LJ) is attached to this spring part (7a).
l! Three ends are fixed. As a result, even if the wire cathode expands due to temperature rise, the expansion is reduced by the spring ml.
(7a,), the wire cathode does not slacken.

Each first grid (G sR), (G tc ), (Gt
s) is formed into a semicylindrical shape with a cylindrical surface facing each wire cathode, and a large number of slits (8) are provided on the cylindrical surface at a predetermined pitch along the elongated direction. This slit (8) is a transmission hole for electrons emitted from the wire cathode (I().The second grid G2 has a first It is constructed by forming slits (9) at the same and corresponding positions as the slits (8) of the grid.In this case, the slit portions (9R) and (9G) of the second grid G2
), (9B) are each corresponding first grid (GLR), (
It can be configured to have a cylindrical surface concentric with G 1G ) and (01B ).

In this case, the electron beam from the wire cathode passes through the slits (8) and (9) of the first and second grids, is emitted linearly, and is spread out in the longitudinal direction of the slits. On the other hand, as the second grid, the portion where the slit (9) is formed like a dove in Figure ff16 may be formed horizontally. At this time, the electron beam is aligned with the dotted line (30
'), it passes through the second grid like a bow and is emitted so as to be bent somewhat inward with respect to the longitudinal direction of the slit.

On the other hand, each fluorescent display segment (2R), (2G), (2
A separator made of a conductive material is arranged to surround B). This separator 11ffl prevents the electron beam from the cathode from hitting the first or second grid G1, G2 and causing secondary electrons (31) (see Figure 6) from emitting light from adjacent fluorescent display segments. A seal 1' is provided to prevent this, and a so-called expansion function is provided to spread the electron beam (3o) from each wire cathode (K) so that the entire corresponding fluorescent display segment (2) is irradiated. 11 serves as a lens formation, and at the same time is used as a power supply means for applying a west voltage, for example, IOK V, to each fluorescent display segment. During assembly, this separator aψ is supported between the surface panel (1Δ) of the glass tube (11) and the side Di (IC) and fixed by a frit. That is, the separator 001 is assembled as shown in FIG. Each fluorescent display segment is surrounded by a frame-like partition divided into three parts, and support claws (11
) are provided, and high voltages (
Anode lead (12
) is derived. Further, an elastic bending piece (13) for positioning is cut and raised on the side of the separate rake. Therefore, when the separator (10) is inserted into the side plate (IC) of the glass tube body from above, as shown in FIG.
is brought into contact with the upper yla1 surface of the side plate (IC) to support the separator, and at the same time, the bent portion (13) is brought into contact with the inner wall of the side plate (IC) so that the separator is positioned at the center. Furthermore, a protrusion rilS (14) bent inward is provided at the upper end of this separator α0), and the protrusion (14)
A projection (15) is provided on the surface. This protrusion (15) accommodates the separator 00) in the side plate (IC) and
c) When the front panel (1^) is placed on top and sealed, it just contacts the carbon layer (3) (Fig. 9 No. 14).

This causes the IIJ pressure from the ζ anode lead (12) to increase in each fluorescent display segment (2R), (2G), (2B).
will be commonly supplied. In the erected state, the anode lead (12) to which high voltage is applied is led out through the sealing portion between the front panel (1^) and the upper end surface of the side IM<IC). Also, wire cathode (
K), the first grid (G1) lead, and the second grid (G2) lead are connected to the back & (IB) and side plate (
and the upper end of the IC) to the outside. It should be noted that a plurality of each lead of the cap (F1), the first grid (G1), and the second grid F' (G2) are led out in order to also serve as support. For example, each first grid (G
IR>, (Gxc), (GIR) have 2 leads on each side, 4 leads in total (16G1), (17Gt)
, (18Gt) are derived. Also, the second grid (G2
) are four glue-F corresponding to the four corners of the back panel.
'(1riG2) is derived. Further, a plurality of cathode (K) glue-F (20F) are led out from each support member (6), (7) to the left and right. The leads (2 leaves) of each cathode are commonly connected to the supporting members (6) and (7), respectively, and the corresponding leads of each node 1 grid (ct) and 2nd Griso F' (G2) are also common. Connected.

Glass tube body (1) has front panel (LA) and side panel (IC)
and the back plate (IB) are sealed together with a flap (22). The back plate (IB) has a Te Nofu for exhaust.

The off tube (21) is fixed with a free throat.

Next, the operation of such a configuration will be explained. Fluorescent display segments of red, green and blue colors l-(21?), (2G), (2B)
For example, through the anode lead (12) (10KV
An anode voltage of approximately Also, 1 grid for each section (
A voltage of, for example, 0~30V is applied to each of GIR), (Gxc), and (Gis).
For example, a voltage of 300 μ is applied to.

It is about 60 to 70 mW'' per wire cathode (KR), (Kc), (KB).
Voltage force (fixed, first grid node C01) can be selectively turned on and off depending on the voltage applied to the terminal side and the second grid node (G2). be. That is, when QV is applied to the first grid (G1), the electron beam from the cathode (K) is turned off and the corresponding display segment (2) does not emit light. Then, for example, 30V to the first grid node (G1).
When is applied, the electron beam from the cathode '(K) force) passes through the first grid node (G1) and is accelerated by the second grid node (G2), and the corresponding phosphor of Table 71ζ segment (2) is Hit this and it will be displayed.

At this time, the voltage applied to the first grid (G1) is 1:1130.
1) to control the pulse rlJ (application time) of
Millimeter emission brightness is controlled. And Figure 6 - Showing - 4 -
In this way, the electron beam from the cathode (I()) is spread by the seven occupiers 00 and irradiated onto all i and lii of the display segment (2). In addition, the electron beam from the cathode hits the first grid and second grid nodes, and the secondary electrons (31) from the first grid and second grid
-ru force (, this secondary 'a child (31) Hasehaleta Qo
) Ni, J: =>71! ttll - hit the adjacent display segment 2) with force ζ. In this way, each display segment I-(211), (2G),
(2B) is a light emitting table, which is selectively displayed at high brightness.

In this fluorescent display cell (40), the entire structure is made of a thin glass, and the low voltage side glues such as the cathode, each first grid, and second grid are connected to the back plate (I) of the glass tube (1).
B) Anode lead (12) with overwhelming force derived from the side
Since it is led out from the front panel (1Δ) side, dangers during discharge and wiring are avoided, and a stable light-emitting display can be obtained.

Furthermore, since a separator QO) to which an anode voltage is applied is arranged so as to surround each fluorescent display segment (2),
This separator (L(1+) constitutes a diffusing lens, and only the first grid (G1) has a curvature, the second grid (G2) is flat, and ζ (in the case of Fig. 6) also has a curvature. The electron beam spreads laterally 1i1 (in the slit direction) and irradiates the entire surface of the display segment (2).At the same time, the separator α0) blocks secondary electrons from the first grid or the second grid. Canted-off adjacent display segments are not emitted.

When performing color display (for example, in the case of a 9300° white screen), the brightness mixing ratio is approximately 7% for the field, approximately 13% for red, and approximately 80% for the edge. Furthermore, when a wire cathode is used as an electron source, it is often used in a temperature restricted region in order to extend its life. Therefore, in order to increase the luminance of the green cathode compared to other cathodes, it is possible to solve this problem by increasing the number of cathodes. For example, there are two green cathodes (Kc) and one each of red and blue cathodes (KR) and (Ks). As a result, the total electron content of green, for example, is greater than that of red and blue, making color display possible.

Of course, using a plurality of other red and blue cathodes also has the effect of lengthening the life. In this way, by increasing the number of green cathodes compared to the others, the brightness can be increased and good voight haulance can be obtained. This eliminates excessive loading of the cathode and can extend the life of the fluorescent display cell. Actually 2
The book is attached at a distance of about 0.8 to 1 mm,
Due to the electron repulsion effect, the amount of electron emission will not be twice that of a single beam, but it can be expected to increase by 70% to 80%. Instead of increasing the number of cathodes, increasing the brightness of the phosphor layer and green can also be achieved, for example, by making the area of the phosphor layer wider than that of the red and blue.

In addition, because wire cathodes are used in temperature-restricted areas, that is, the cathode loading of oxide cathodes is used at a temperature of several tens of minutes to prevent the wire from appearing red, so the amount of electrons emitted from each cathode is small. . One way to solve this problem is to wind a tungsten wire in a spiral to substantially increase the surface area of the oxide, but if the length of the spiral is long, there is a risk of loosening or vibration of the cathode. be. Taking these points into consideration, the wire cathode can be constructed as shown in FIGS. 10 and 11. In this example, a core wire (35) made of a high temperature material such as tungsten or molybrene is provided, and an insulator (35) such as Al2O3 is provided on the surface of this core wire (35).
6) and a tungsten wire (
37) is wound in an α-shape, and an electron-emitting substance (38) such as carbonate is deposited on the threaded portion by spraying or electrodeposition to form a directly heated cathode (34). in this case,
Both ends of the core wire (35) are fixed to the spring parts (7a) of one support part (6) and the other support part (7) by spot welding or the like, and are stretched under tension. The wire is fixed by spot welding or the like between the support part (6) on one side and the second support part (6') on the other side.

In this configuration, the core wire (35) has an insulator (36) attached to it.
By winding the cathode spirally on top and stretching the core wire (35) with a spring section, problems such as short-circuits between the ζ spirals and thermal deformation of the spiral sections can be eliminated. and the substantial oxide surface area increases, and
As shown in Fig. 11, the temperature difference between both ends and the center of the cathode is reduced and the uniform temperature distribution area (A) becomes wider, which together with the increase in the amount of electron emission, resulting in an overall It is possible to increase the allowable current amount from the cathode per ζ. Curve (1) represents the temperature distribution.

As shown in FIG. 12, a plurality of display cells (40) as described above (for example, 24 cells) are inserted into one unit to form one unit. Thus, a giant image display device is constructed.By the way, when these plurality of display cells are assembled into a unit case, they are molded and fixed with resin or the like.However, since the anode voltage of this display cell is about 10 KV, If the fixation is incomplete, there is a risk that it will peel off when force is applied from the surface to remove dirt, etc. Also, similar failures may occur due to aging. It is necessary to fix it to the case.For this purpose, the front panel (18) of the glass tube (1) as the display cell (40) is attached to the side plate (1).
c) It is formed so as to protrude outward. In this case the first
It may be extended over the entire circumference as shown in FIG. 3A, or it may be extended only in one direction as shown in FIG. 13B. On the other hand, the unit case (41) has a plurality of display cells (40) facing on its front plate (42) as shown in FIG.
In this case, 24 window holes (43) are provided, and each window hole (4
A stepped portion (44) into which the peripheral portion of the front panel (18) of the display cell is fitted is formed on the back side of the edge of 3). Then, place the display cell (4o) on the front plate (42) so that its front panel (1Δ) faces the through hole (43) of the unit case.
Insert the fixing member (such as resin mode) from the back side into the back side of the
45) Fix Nyoge C. At this time, since the front panel (1Δ) protrudes outward, the odor from this protruding part (5o) is sandwiched between the 'ζ fixing part +A' (45) and the front plate (42) of the unit case, and the entire display cell ( 4o) is firmly fixed to the unit case (41). In addition, as necessary, as shown in FIGS. 15 and 16, the shaft (52)
A locking piece (53) that is rotatable around the center is provided, and the projecting portion (5o) of the front panel (IA) of the display cell is connected between this locking piece (53) and the front plate (42) of the unit case. to hold. After that, you can fix it even more securely by fixing it in resin mode or the like. Furthermore, since the display cell is of high brightness, the front panel side coated with the phosphor layer needs to be liquid cooled. For this reason, when the display cell is attached to the unit case, a banking (54) made of silicone rubber or the like is inserted between the step (44) of the front plate (42) of the unit case and the front panel (1/l). Furthermore, a transparent plate (55) made of polycarbonate or the like is arranged on the front side, and this transparent plate (55)
), front panel (LA), and unit case window hole (43
) is filled with a cooling liquid (56). Of course, at this time, each window hole (
43) is provided with a cooling liquid introduction groove (57) communicating with the cooling liquid introduction groove (57).

In the application example above, a display cell having three fluorescent display segments of red, green, and blue was described, but in addition, multiple fluorescent display segments may be arranged in a pattern to display the usual characters, numbers, etc. This feature can also be applied to display devices with That is, a plurality of fluorescent display segments are arranged in a predetermined manner, for example, in a figure-eight configuration, and a common anode potential is applied thereto.

A plurality of cathodes and a plurality of first grids are arranged to face each display segment, and a common second grid is arranged between these first grids and the display segments, and a voltage is applied to the first grid. By controlling the display, a desired display segment is selectively displayed by emitting light.

Effects of the Invention According to the present invention described above, it is possible to easily obtain a fluorescent display device that emits brightness, and especially in this case, it can operate stably and is constructed in a thin J'' shape as a whole. Therefore, a huge display device can be easily constructed by arranging a plurality of such display elements as a single cell.

[Brief explanation of drawings]

FIG. 1 is a front view of a fluorescent display device of the present invention, particularly a unit cell;
Figure 2 is a cross-sectional view taken along the line A-A, and Figure 3 is a cross-sectional view taken along the line B-B.
4 is a partially broken perspective view of 11i, FIG. 5 is an enlarged sectional view of the display segment, FIG. 6 is a sectional view for explaining the operation of the separator, and FIG. 7 is a perspective view of the separator. , FIG. 8 is a semi-sectional view of the separator placed inside the side plate of the tube body, FIG. 9 is a sectional view of the display segment and separator portion, and FIG. 11 is a perspective view showing the stretched state, FIG. 12 is a front view showing one unit incorporating a plurality of display cells, and FIGS. 13A and 13B show other examples of display cells. Fig. 14 is a sectional view taken along line C-C in Fig. 12, and Fig. 15 shows another mounting method.
1tli side view, and FIG. 16 is its back view. +l) is a glass tube body, (2R), (2G), (2B) are fluorescent display segments, (GIR), (G tc ), (
GtB) is a control electrode, (G2) is an acceleration electrode, (KR),
(Kc), (Ke) are cathodes, αO) are separate lakes,
(35) is a core wire, (36) is an insulator, (37) is a tungsten wire, (38) is an electron emitting material, (41) is a unit case, (42) is a front plate, (43) is a window hole, ( 45
) is a fixing member, (55) is transparent, and (56) is a cooling liquid. Figure 1 Figure 2 B RKII B Figure 3 Figure 5 Figure 7 Figure 8 f311 11 111j Figure 6 B Figure 9 Procedural amendment 1. Display of case 1982 Patent Application No. 140141 2, Title of invention, Optical AO device 3, Relationship with person making amendments (0) Patent applicant address: 6-7-35, Kitashinyo, Tokyo Parts Co., Ltd. Name (2)
8) Sony Corporation Representative Director Norio Ohga 4, Representative 1-8-1H Nishi-Shinjuku, Shinjuku-ku, Tokyo
1i? +・i building) Kito j+i, (03) 343-58
21 (Representative) (338B) Patent Attorney Tei Ito 5, Amended Order No. 1 (Showa Year, Month I) (1) In the specification, page 7, line 18, “Carbon layer (3) K J is replaced by “Carbon layer ( 3) or metal back layer (5).” (2) Same, page 9, line 11 rOV~30VJ as "ov~1
0V” is corrected. (3) Same page, line 12 r300VJ is “30~5oV
” he corrected. (4) Same page, line 14 r 60~70mWJ is ``8o~
Corrected to 12゜mWJ. (5) Same, page 10, line 2 raovJ is r5VJ! :fT
Correct. (6) Same page, lines 6-7 r(30V)" to r(5V)J
I am corrected. (7) Same, page 13, line 13 r 9300'series'' at 193
00'K," he corrected. (8) Same, page 13, line 13, “molyprene” is corrected to “molybdenum”. (9) Same, page 16, line 1, ``resin mode'' is corrected to read ``resin mold.'' 04 Same, page 11, line 11, ``1M resin mode'' is corrected to read ``resin mold.'' Ql) Same, page 17, line 10, ``Mogi de desu.'' is corrected to ``mono deru.''that's all

Claims (1)

[Claims] It has a plurality of fluorescent display segments to which high voltage is applied, a plurality of cathodes and a plurality of control electrodes arranged corresponding to each of the segments, and a common acceleration electrode arranged between the segments and the control electrodes. , a fluorescent display device configured to selectively emit light from the segments by controlling the voltage of each of the control electrodes.