JPS6032240A - Phosphor display device - Google Patents

Abstract

PURPOSE:To obtain the captioned device having luminance of high brightness in which error display due to secondary electrons is surely checked, while an electron beam hits the whole surface of the selected display segment by arranging separators to be supplied with high voltage surrounding each segment respectively. CONSTITUTION:The phosphor display segments 2R, 2G and 2B of respective colors red, green and blue are supplied with anode voltage of about 10kV through an anode lead wire 12, while the second grid G2 is impressed by voltage, for instance, of 300V. The ''ON'', ''OFF'' display is selectively made through the voltage to be given to the first grid G1 while controlling luminous brightness by controlling the pulse length of the voltage to be impressed on the first grid. The electron beam from the cathode K is widened by the separators 10 for being radiated on the whole surfaces of the display segments 2. The secondary electrons from the first and second grids are checked by the separators 10 while not hitting the adjacent display segments.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a surface luminescent fluorescent display device.

BACKGROUND ART AND PROBLEMS The development of large-sized display devices in which a large number of light-emitting display cells are arranged to obtain a large screen is progressing.

When a plurality of display segments are provided in one light-emitting display cell, the selected display segment is made to fully emit light,
Non-selected display segments must be ensured to be non-emissive.

For example, it has a plurality of fluorescent display segments, a plurality of cathodes facing each segment, a plurality of control electrodes, and a common accelerating electrode, and controls the voltage of the control electrode to selectively display light in the ζ segment. In a luminance fluorescent display cell, 1
When one display segment is caused to emit light, there is a risk that other adjacent display segments may be emitted by secondary electrons. In addition, in such a display cell, measures are desired so that the entire surface of the phosphor layer of the display segment is irradiated with an electron beam in order to obtain crystal brightness.

OBJECTS OF THE INVENTION In view of the above-mentioned points, the present invention provides a novel one-bright one-brightness light emitting flashlight that reliably prevents erroneous display due to secondary electrons and allows the electron beam to hit the entire surface of a selected display segment. An optical display device is provided.

SUMMARY OF THE INVENTION The present invention comprises a fluorescent display segment to which a high voltage is applied, a plurality of cathodes and a plurality of control electrodes corresponding to each segment, and a common acceleration disposed between each segment I and each control electrode. This is a fluorescent display device in which a separator having an electrode and to which the above-mentioned high voltage is supplied is arranged surrounding each segment.

In the fluorescent display device of the present invention, erroneous display due to secondary electrons is prevented. A diffusing lens is also formed to irradiate the entire surface of the display segment with the electron beam.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluorescent display device according to the present invention will be described below with reference to the drawings.

1, 2, 3 and 4 are front views showing the fluorescent display device i1 of the present invention, particularly its unit cells, and its A-
A sectional view taken along the A line, a Wi plane view taken along the BB line, and a partially broken perspective view are shown. In the figure, (1) is the front panel (
1Δ), back & (IB), and side plates (IC); inside this glass tube (1), there are a plurality of fluorescent display segments (2) ((2R) , (
2G), (2B)) and a plurality of cathodes (K) ((KR), (K
c), (KB)) and the first grid (control electric 4m) (
G1) ((GIR), (G xc ), (GIB))
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), (2G), and (2B) are formed. Specifically, as shown in Figure 5, a carphone layer (3), which is a conductive layer, is printed in a frame shape on the inner surface of the front panel (18), and the conductive layer (3) corresponds to each blank space within the frame shape. The red phosphor layer (2R), the green phosphor layer (2G), and the blue phosphor layer (2B), which constitute each display segment, partially straddle the carbon layer (3). 4. A metal bank (5) made of, for example, aluminum is deposited on the entire surface with an intermediate film (4) interposed therebetween. Wire cathodes (KR), (Kc), and (KFI) are installed inside the back panel (IB) so as to face the display segments (2R), (2G), and (2B) formed by these phosphor layers, respectively. each i
The first glisodes (GIR), (+C), (
G, R) are arranged, and three first Griso +' (GIR
), (GIG), and (' 01g ), a second grid G2 is arranged in common. Each wire cathode (■ () is formed by applying carbonate, which is an electron-emitting substance, to the surface of a tungsten heater, for example. Each wire cathode (KR)
, (Kc) and (KB) are stretched between a pair of conductive support parts (6) and (7) arranged on both sides of the back panel (IB), respectively. One support part (6) is for fixing one end of the wire cathode, and the other support part (7) is provided with a spring part (7a), and the other end of each wire cathode is fixed to this spring part (7a). is fixed. Puff by this. Even if the wire cathode stretches due to an increase in temperature, the stretch is absorbed by the spring portion (7a) and the wire cathode does not loosen. Each 1st Grisoto (GIR), (
G tc )・(GIB) is formed into a pigtail shape with a cylindrical surface facing each wire cathode, and a large number of slits (8) are formed on the cylindrical surface at a predetermined pitch along the longitudinal direction. Can be established. This slit (8) is a hole through which electrons emitted from the wire cathode (K) can pass.

The second grid G2 is connected to each first grid (GIR), (G
It is constructed by forming slits (9) in the portions corresponding to xc ) and (G is ) at the same corresponding positions as the slits 8) of the first grid. In this case, the slot-throat portions (9R), (9G), and (9B) of grid G2 in box 2 are the corresponding first grids (GIR), (Gzc), and (GIR).
It can be configured to have a cylindrical surface concentric with.

In this case, the electron beam from the wire cathode passes through the slit throats (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 shown in FIG. 6, the second grid throat may be formed horizontally with the part where the slits 9) are formed. At this time, the electron beam is aligned with the dotted line (30
As shown in '), the light passes through the second glisotho' and is emitted so as to be bent somewhat inward in the longitudinal direction of the slit.

On the other hand, each fluorescent display segment (21), (2G), (
2B) made of a conductive material so as to surround the separator (Il
l) is placed. This separator (10) allows the electron beam from the cup 1' to pass through the first or second Gliso i'G.
+, secondary electrons (31) from G2 (See Figure 6! The electron beam (3o) from K) serves to spread the electron beam so that the entire corresponding fluorescent display segment (2) is irradiated, and at the same time serves to form a so-called diffusion lens. High voltage e.g. I
It is also used as a feeder I sink to provide OK V. This separate lake (Qtl) is used for the front panel (1Δ) of the glass tube (1) and the side 1 (IC
) and fixed by a frit. That is, the separate rake aω forms a rod partitioned into three parts so that each fluorescent skin segment is surrounded, as shown in FIG. A protruding support claw (11) is provided, and an anode lead (12) for supplying surface pressure (anode voltage) to the other opposing sides is led out. Further, an elastic bending piece (13) for positioning is cut and raised on the side of the separator. Therefore, the separator 00) is used as the side plate of the glass tube (IC
), as shown in Figure 8, the supporting claws (11) just come into contact with the upper end surface of the side plate (1c), and at the same time the separator is supported, the bent part (13) The separator (101) is made to abut against the inner wall of the side plate (1c) so that the separator is located in the center 6. Furthermore, a protrusion UIS (14) that is bent inward is provided at the upper end of this separator (101), and the protrusion (14) ) is provided with a protrusion (15). This protrusion (15) houses the separator 0ω in the side plate (IC),
When the front panel (18) is superimposed on the side plate (IC) J: and sealed, it just contacts the carbon layer (3) (9th
(see figure). Due to the dirt, high voltage from the 1 node lead (12) is applied to each fluorescent display segment (21υ, (2G),
(2B) will be commonly supplied. In the assembled state, the anode lead (12
) is led out to the outside through the sealing portion between the front panel (18) and the upper end surface of the side plate (1c). The leads of the wire cathode (K), the leads of the first grid (Gl), and the leads of the second grid (G2) are connected to the 17-face plate (I), respectively.
B) and the lower end surface of the side plate (1c) and are led out to the outside through the sealing part. In addition, a plurality of leads of the cathode (I(), the first grid (G1), and the second grid (G2) are led out in order to also serve as support. For example, each lead of the first grid (GIR), (G sa ) and (Gls) have 2 leads on each side, 4 leads in total (16G1)
, (17G1), and (18G1) are derived. Further, from the second grid (G2), four leads (19G2) are led out so as to correspond to the four corners of the rear panel. In addition, the cathode (I〈) glue (20F) is attached to each support member (6), (
7), a plurality of lines are derived on the left and right, respectively. Then, the leads (201) of each cathode are commonly connected to each support part 4A (61 and (7)), and the leads (201) of each cathode are connected in common to each support part 4A (61 and (7)), and
, the corresponding leads of the second grid (G2) are commonly connected.

The glass tube (1) is connected to the front panel (18) and the side tM (IC
) and the back side (IB) are sealed together with a frit (22). An exhaust gas pipe (21) is fixed to the back side (IB) with a frit.

Next, the operation of such a configuration will be explained. An anode voltage of, for example, about 10 KV is supplied to the red, green, and blue fluorescent display segments (2R), (2G), and (2B) through an anode lead (12). Matata box 1 grid (G
IR), ((, 1c), and (Gns), for example, O
A voltage of ~30V is applied, and a voltage of 300V, for example, is applied to the second grid G2.

The power of each wire cathode (KR), (Ka), and (K day) is approximately 60 to 7 QmW. In this configuration, the voltage on the anode side and the second grid (G2) is fixed, and the display is selectively turned on or off depending on the voltage applied to the first grid F' (G+). i.e. 1st Griso)
” When 0■ is applied to (Gz), the cathode (I()
The electron beam from the display segment (2) is cut off and its corresponding display segment (2) is not displayed. When, for example, 30V is applied to the first grid (G1), the electron beam from the cathode (K) passes through the first grid (G1) and is accelerated at the second grid (G2), resulting in the corresponding display pigment (2). Hit the phosphor to make it appear as a light-emitting display.

At this time, the voltage (30
Emission brightness is controlled each time the duration of the pulse (application time) in (2) is controlled. Then, as shown in FIG. 6, the electron beam from the cathode (K) is spread by the separator α0) and irradiated onto the entire surface of the display segment (2).

Further, the electron beam from the cathode hits the first grid and the second grid, and secondary electrons (31) are generated from the first and second grids, but these secondary electrons (31) are blocked by the separator QOI. The display segment (2) does not hit the adjacent display segment (2). In this manner, each display segment (2R), (2G), and (2B) is selectively emitted and displayed at juI brightness each time the voltage of the first grid is selectively controlled.

This fluorescent display cell (40) has a thin structure as a whole, and the leads on the low voltage side of the cathode, the first grid, the second grid, etc. are connected to the back plate (IB) of the glass tube (1).
Since the anode lead (I2) on the high voltage side is led out from the front panel (18) side, dangers during discharge and wiring are avoided, and a stable light-emitting table can be obtained.

In particular, since a separator u01 to which an anode voltage is applied is arranged to surround each fluorescent display segment l-(21), a diffusion lens is formed by this separator 00, and the curvature is reduced by the first grid (G1). Motase, second
Even if the grid (G2) is flat (in the case of FIG. 6), the electron beam from the cathode "K" spreads laterally (in the slit direction) and irradiates the entire surface of the segment (2). At the same time, the separator 00) prevents secondary electrons from the first grid or the second grid from lighting up adjacent display segments that have been cut off.

When performing color display (for example, in the case of a 9300° white screen), the brightness mixing ratio is approximately 7% for blue, approximately 13% for red,
Approximately 80% is green. 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, the green cathode (Kc)
Two cathodes are used, and one cathode (KR) and one cathode (Ks) are used for red and blue respectively. As a result, for example, the total number of electronic shells on the edges is greater than that of the other red and blue colors, and the color display becomes MJ-like. Incidentally, using a plurality of 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 a good white balance can be obtained. This eliminates excessive loading of the cathode and can extend the life of the fluorescent display cell. In reality, two pieces are attached at a distance of about 0.8 to 1 mm, and the amount of electron emission is not twice as much as when one piece is used due to the electron repulsion effect, but it is an increase of 7 stones by 11 to 80%. can be expected. Incidentally, in order to increase the brightness of (2), instead of increasing the number of cathodes, it can also be achieved by, for example, making the area of the phosphor layer wider than that of red and blue.

Further, since the wire cathode is used in a temperature restricted region, that is, the cathode loading of the oxide cathode is used at a temperature of several tens of minutes so as not to appear red, the electron emission p from each cathode is small. One possible solution to this problem is, for example, 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 that the cathode may loosen or vibrate. 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 low temperature material such as tungsten or molybrene is provided, and an insulator (35) such as 61203 is provided on the surface of the core wire (35).
6) and a tungsten wire (
37) into a spiral, and an electron-emitting substance (3
8) For example, carbonate is deposited 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 the core wire (35) is stretched under tension. The tungsten wire is connected to one support part (6) and the other second support part (6).
6') are fixed by spot welding or the like.

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, short circuits between the spirals can be prevented.
Problems such as thermal deformation of the circular part can be eliminated. Then, the substantial oxide surface area increases, and as shown in Figure 11, the temperature difference between both ends and the center of the cathode decreases, and the uniform temperature distribution area (A) becomes wider. The amount of emission can be increased, and therefore the amount of current allowed from each cathode can be increased as a whole. Curve (1) shows the temperature distribution.

As shown in FIG. 12, a plurality of, for example, 24 display cells (40) as described above are assembled in a unit case (41) to form one unit. Further, by arranging a large number of these units, a giant image display device is constructed. By the way, when the plurality of display cells are assembled into a unit case, they are fixed by molding with resin or the like. However, the anode voltage of this display cell is IOK
If the fixation is incomplete because it is as high as V, there is a risk that it will peel off when force is applied from the surface to remove dirt, etc. from the surface side. Also, similar failures may occur due to changes over time. Therefore, it is necessary to securely fix the display cell to the unit case.

For this reason, the display cell (40) is made of glass tube (
The front panel (LA) of No. 11 is formed so as to protrude outward from the side panels (IC). In this case, it may be extended over the entire circumference as in the case of the 13th image, or it may be extended only in one direction as shown in FIG. 13B. On the other hand, the unit case (4I) has its front plate (4I) as shown in Figure 14.
2), the display cell (40) faces a plurality of cells, in this case 24(1)
1i1 window holes (43) are provided, and a step i7i (44) into which the peripheral part of the front panel (18) of the display cell is fitted is formed on the back side of the edge of each window hole (43). Then, the display cell (40) is mounted on the front plate (42) so that its front panel (18) faces the through hole (43) of the unit case.
) and fix it from the back side with a fixing member (45) such as resin mode. At this time, since the front panel (18) protrudes outward, this protrusion part (50)
), the fixing member (45) and the front plate of the unit case (
42), and the display cell (40) as a whole is firmly fixed to the Unison case (41). Also, if necessary, the shaft (52) is shown in Figures 15 and 16 like a sword scrap.
A locking piece (53) that can be rotated around the center is provided, and the projecting part ( 50) is held. After that, you can fix it even more securely by fixing it in resin mode or the like. Furthermore, since the display cell has a brightness of 101, 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 backing (54) made of silicone rubber or the like is interposed between the step (44) of the front plate (42) of the unit case and the front panel (18). Furthermore, a transparent 4ti (55) made of, for example, polycarbonate is placed on the front, and a cooling liquid (56) is placed in the space formed by this transparent plate (55), the front panel (1Δ), and the window hole (43) of the unit case. Fill it with. Of course, at this time, the front plate of the unit case (42
) has a coolant introduction surface (57) that communicates with each window hole (43).
is provided.

Application Example In the old example, "C" was mentioned for a display cell with three fluorescent display segments of red, green, and blue, but other characters such as
This method can also be applied to a display device in which a plurality of fluorescent display segments are arranged in a pattern for displaying numbers or the like.

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 I' are arranged to face each display segment, and a common second grid is arranged between these first grids and the display segment (. By controlling the voltage applied to Gliso 1, desired display segments are selectively displayed by emitting light.

Effects of the Invention According to the present invention described above, by arranging separators to which the same crystallization as the display segments is provided so as to surround each of a plurality of fluorescent display segments, a diffusing lens is formed, and the electron beam from the cathode is spreads horizontally and illuminates all songs in the display segment. Therefore, a high-intensity luminescent display can be obtained. Further, the separator blocks secondary electrons from the control electrode or the accelerating electrode, so that the cut-off W2 contact display segment does not emit light, and stable light emitting display can be performed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a fluorescent display device of the present invention, particularly a unit cell;
Figure 2 is a W' side view on the A-A line, and Figure 3 is the B-
A cross-sectional view along line B, Fig. 4 is a partially broken perspective view, and Fig. 5 is a partially broken perspective view.
The figure is an enlarged sectional view of the display segment, FIG. 6 is a sectional view for explaining the operation of the separator, FIG. 7 is a perspective view of the separator, and FIG. 8 is a plan view of the separator arranged in the side plate of the tube body. Fig. 9 is a sectional view of the display segment and separator portion, and Fig. 10 shows another example of the wire cathode.
A top view, Figure 11 is a perspective view of the stretched state, and Figure 12 is a perspective view of the stretched state.
The figure is a front view showing one unit incorporating a plurality of display cells, FIGS. 13A and 13B are neo perspective views of other examples of display cells, and FIG. 14 is a C--FIG. A sectional view on the C line, Fig. 15 shows another mounting method, and Fig. 16
The figure is its back view. +l) is glass tube body, (2R), (2G), (2B) is fluorescent surface cutting segment 1-1 (CIR), (Gtc)
, (GIB) is the control electrode, (G2) is the acceleration electrode, (K
R), (Kc), (Ks) are cathodes, ([01 is a separator, (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 a transparent plate, and (56) is a cooling liquid. Fig. 1 C Fig. 2 hRK & B 8 Fig. 3 Fig. 5 Fig. 8 Fig. 6 B Fig. 9 Procedural amendment 1982 7 Aihe 2nd 1, Indication of the case 1988 Patent Application No. 140143 2. Name of the invention. , Hikari fX Oya Oki 3, Relationship with the case of the person making the amendment Norio Ohga (338B), representative representative of the patent applicant, Tei Ito, patent attorney, 5, request for amendment order 1, amended on June 6, 1929. (1) In the specification, page 8, line 9 “Carbon layer (31K
Correct J to 1 "J for carbon layer (3) or metal back layer (5). (2) Same, page 10, line 2 "0■~30V" to "Ov~1
0V” is corrected. (3) Same page, line 3 r 300 V J as “30-5
0V” is corrected. (4) Same, same page, line 5 “60-70mW” is changed to “80-1
Correct it to 20mWJ. (5) Same page, line 13, “30VJ is corrected to “5■”. (6) Same, same page, lines 17-18 F(30v)" to f-(5
■Correct it as the month. (7) Same, 12th Tei 9th line 1-9300° system” to “930
0°K” is corrected. (8) Same, 14th line 5th line "Molyprene" is corrected to "Molybdenum". (9) Same, 16th line, 13th line, ``resin mode'' is corrected to ``resin mold.'' 4 Same, g 17 A 3 line rr fat mode” r 81
"Nom mold," he corrected. θυ Same, page 18, line 2, ``Mogi de desu.'' is corrected to ``mono deru.''that's all

Claims (1)

[Claims] a fluorescent display segment to which a high voltage is applied; a plurality of cathodes and a plurality of control electrodes corresponding to each segment;
A fluorescent display device comprising a common acceleration electrode disposed between each of the segments and each control electrode, and a separator to which the high voltage is supplied is arranged surrounding each of the segments.