JPS60225879A - Display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to two-dimensionally arranging a large number of fluorescent display elements and driving each of these fluorescent display elements with desired data to display a desired image. The present invention relates to a display device that performs.

Background Art and Problems There has been proposed a display device in which a large number of fluorescent display elements are two-dimensionally arranged and each of these fluorescent display elements is driven with desired data to display a desired image. ing.

As a fluorescent display element used in such a device, the applicant of the present application previously proposed the following.

1, 2, 3, and 4 are a front view, a cross-sectional view taken along line A-A, and a line B-B of the fluorescent display element, respectively.
A cross-sectional view along the line and a partially broken perspective view are shown. In the figure, (1) shows a glass tube consisting of a front panel (IA), a back plate (IB), and a side plate (IC), and this glass tube +
1) a plurality of fluorescent display segments comprising a phosphor layer (
2) ((2R), (2G), (2B)) and a plurality of cathodes (K) ((KR),
(Kc ), (Km) ) and the first grid (control electrode) (Gv) ((GIR), (Gzo), (Gt
i)) and a common second grid (acceleration electrode (G2)).The fluorescent display segment (2) is located on the front panel (l^
) is formed by depositing a phosphor layer on the inner surface of the
In this case, three fluorescent display segments (2R), (2G), and (2B) of red light emission, green light emission, and blue light emission are formed.

Specifically, as shown in Fig. 5, a bar-shaped carbon layer (3), which is a conductive layer, is printed on the inner surface of the front panel (IA).
A red phosphor layer (2R), a green phosphor layer (2G), and a blue phosphor layer (2B), which become each display segment, correspond to each empty space in the frame shape. It is formed by printing so as to straddle the carbon layer (3), and a metal back layer (5) made of, for example, aluminum is adhered to the front surface of the carbon layer (3) via an intermediate film (4). Wire cathodes (KR), (Kc), and (KB) are installed inside the back panel (IB) to face the display segments (2R), (2G), and (2B) formed by the phosphor layers, respectively. Opposite the wire cathodes (KR), (Ko), (Kl) are the first grids (Gti), (Gto), (Go+), respectively.
are arranged, and further three first grids (G iR), (G
A second grid (G2) is commonly disposed in both tc) and (GIB). Each wire cathode (K) is formed, for example, by coating the surface of a tungsten heater with carbonate, which is an electron-emitting substance.

Each wire cathode (KR), (Kti), (Kl)
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 (
Reference numeral 6) fixes one end of the wire cathode, and the other support part (7) is provided with a spring part (7a) to which the other end of each wire cathode is fixed. As a result, even if the wire cathode is stretched due to temperature fluctuations, the stretch is absorbed by the spring portion (7a) and the wire cathode does not loosen. Each of the first grids (GIR), (GIG), and (Gts) is formed in a semicylindrical shape with a cylindrical surface facing each wire cathode, and a predetermined pinch is applied to the cylindrical surface along the longitudinal direction. A number of slits (8) are provided. This slit (8) is a hole through which electrons emitted from the wire cathode (K) can pass. The second grid (G2) has slits (9) formed at the same positions as the slits (8) of the first grid in parts corresponding to the first grids (G IR), (G to ), and (Gts). configured. In this case, the slit portions (9R) and (9G) of the second grid (G2)
), (9B) are each corresponding first grid (GIR),
It can be configured to have a cylindrical surface concentric with (Glc) and (Gts). In this case, the electron beam from the wire cathode passes through the slits (8) and (9) of the first grid and the second grid and is emitted in a straight line,
The slit is widened in the longitudinal direction. On the other hand, as shown in FIG. 6, the second grid may have a horizontal portion where the slit (9) is formed. At this time, the electron beam passes through the second grid as indicated by the dotted line (30') and is emitted so as to be bent somewhat inward with respect to the longitudinal direction of the 'ζ slit.

On the other hand, each fluorescent display segment (2R), (2G), (2
A separator a made of a conductive material is arranged so as to surround B). In this separator a, when the electron beam from the cathode hits the first or second grid (G1) or (G2), the secondary electrons (31) (see FIG. 6) from the cathode are adjacent to the fluorescent display segment. A shield to prevent this from emitting light and each wire cathode (K)
The effect of spreading the electron beam (30) so that it irradiates the whole of the corresponding fluorescent display segment (2), forming a so-called diffusion lens, and at the same time applying a voltage to each fluorescent display segment, e.g. It is also used as a power supply means for providing 10kV. During assembly, this separator α field is supported between the front panel (IA) and side plate (IC) of the glass tube +11 and fixed by a frit. That is, as shown in FIG. 7, the separator is formed into a bar partitioned into three parts so that each fluorescent display segment is surrounded, and each of the separator bars projects outward from one of the opposite sides of the upper end thereof. Support claws (11) are provided, and anode leads (12) are led out for supplying high voltage (anode voltage) to the other opposing sides, respectively.

Also, on the side of the separator there is an elastic bending piece (1 piece) for positioning.
3) is excised. Therefore, when the separator frame is inserted into the side plate (IC) of the glass tube body from above, the supporting claw (11) just contacts the upper end surface of the side plate (IC) as shown in FIG. is supported, and at the same time the bent part (
13) is brought into contact with the inner wall of the side plate (IC) so that the rake is located at the center at seven points. Furthermore, this separator α@
A protrusion (14) that bends inward is provided at the upper end of the
A protrusion (15) is provided below the protrusion (14). This protrusion (15) comes into contact with the carbon N (3) just when the separator aω is housed in the side plate (IC) and the front panel (IA) is overlaid and sealed on the side plate (IC) (Fig. 9). reference).

This allows high voltage from the anode lead (12) to be commonly supplied to each of the fluorescent display segments (2R), (2G), and (2B). In the assembled state,
An anode lead (12) to which high voltage is applied is led out through a sealing portion between the front panel (IA) and the upper end surface of side 1 (IC). Also, the wire cathode (K) lead, the first grid (Gl) lead, the second grid (Gl) lead,
The leads of G2) are guided to the outside through the sealing portion between the back plate (IB) and the lower end surface of the side plate (IC). Note that a plurality of each lead of the cathode (K), the first grid (G1), and the second grid (G2) are led out in order to also serve as support. For example, each first grid (,GIR), (
(gG), (G111) have two leads on each side for a total of four leads (16Gs), (17Gx), (18
Gi) is derived. The second grind (G2) has four leads (19G) corresponding to the four corners of the back panel.
2) is derived. Also, the cathode (K) lead (2
A plurality of 0F) are led out to the left and right from each of the support members (6) and (7), respectively. and each cathode lead (20
F> are commonly connected to each of the support members (6) and (7), respectively, and the corresponding leads of each of the first grid (G1) and second grid (G2) are also commonly connected.

Glass tube body (11 is the front panel (1^) and side plate (1c)
and a back plate (IB) are sealed together with a frit (22). A tip-off pipe (21) for exhaust is fixed to the back plate (IB) with flint.

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). Also, each first grid (G
For example, 0■ for IR), CGto), and (GIB>).
A voltage of ~30V is applied, and a voltage of, for example, 300V is applied to the second grid (G2). Wire cathode (KR), (KG), (KB) is 60-70m each
It is about W. 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 (G1). That is, when O2 is applied to the first grid (G1), the electron beam from the cathode (K) is cut off, and the 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) to generate the corresponding display segment (2). Hit the fluorescent material to make it emit light.

At this time, the voltage (30V) applied to the first grid (GA)
Emission brightness is controlled by controlling the pulse width (application time) of . As shown in Figure 6, the cathode (K
) is spread by the separator (lω) and irradiates the entire surface of the display segment (2). Also, the electron beam from the cathode hits the first grid and the second grid and is emitted from the first grid and the second grid. secondary electron (3
1) is generated, but this secondary electron (31) is blocked by the separator Qω and is transmitted to the adjacent display segment (2).
Never hit. In this way, the voltage of the first grid can be selectively adjusted. - each display segment (2R), (2
G) and (2B) are selectively displayed using quotient luminance.

This fluorescent display element (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 (12) on the high-voltage side is led out from the front panel (1^) side, dangers during discharge and wiring are avoided, and a stable light-emitting display can be obtained.

In particular, since a separator (101) to which an anode voltage is applied is arranged so as to surround each fluorescent display segment (2), a diffusing lens is constituted by this separator a, and the curvature is reduced by the first grid (Gz). Also, since the second grid (G2) is flat (in the case of Figure 6), the electron beam from the cathode (K) spreads laterally (in the direction of the slit) and illuminates the entire surface of the display segment (2). At the same time, the separator prevents secondary electrons from the first grid or the second grid from causing the adjacent cut-off display segment to emit light.

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 edge cathode compared to the other cathodes, it is possible to solve this problem by increasing the number of cathodes. For example, the green cathode (Ko
) into two cathodes (KR) and (Ks+) for red and blue.
) shall be one each. As a result, the total amount of electrons for green, for example, becomes larger than those for red and blue, making it possible to display colors. Of course, using a plurality of other red and blue cathodes has the effect of lengthening the life. In this way, by increasing the number of green cathodes by three 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 wires are installed with a distance of about 0.8 to 1 mm apart, and the amount of electrons emitted is less than that of one wire due to the electron repulsion effect.
Although it won't double, we can expect an increase of 70-80%. still,
Instead of increasing the number of cathodes, increasing the brightness of green can also be achieved by, for example, making the area of the phosphor layer wider than that of red and blue.

In addition, since 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, so that they do not appear red, the amount of electrons emitted from each cathode is small. One way to solve this problem is to substantially increase the surface area of the oxide by winding tungsten wire in a spiral shape, but if the length of the spiral is long, loosening or vibration of the cathode may occur. There is a fear. Taking these points into consideration, the wire cathode can be constructed as shown in FIGS. 1θ 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 spirally wound, and an electron emitting substance (38) such as carbonate is deposited on the gI7iiiI portion by spraying or electrodeposition to form a directly heated cathode (34). In this case, the core wire (35) has both ends connected to one support portion (6).
and the spring part (7a) of the other support part (7) by spot welding or the like, and are stretched under tension, and the tungsten wire is connected between one support part (6) and the other second support part (7a). The parts (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 spiral portion can be eliminated. 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, which in turn increases the amount of electron emission. Therefore, it is possible to increase the allowable current amount from one cathode as a whole. Curve (1) represents the temperature distribution.

In this way, a fluorescent display element is formed. In this case, by arranging separators that are supplied with the same high voltage as the display segments so as to surround each of the multiple fluorescent display segments, a diffusion lens is formed, and the electron beam from the cathode spreads laterally to display the display. The entire surface of the segment is irradiated. Therefore, a high-intensity luminescent display can be obtained.

Furthermore, the separator blocks secondary electrons from the control electrode or the accelerating electrode, preventing the cut-off adjacent display segments from emitting light, allowing stable light-emitting display.

Furthermore, when forming a display device using the above-mentioned fluorescent display element, the following procedure is performed.

That is, the fluorescent display element (4o) as described above is the 12th
As shown in the figure, a plurality of units, for example, 6 vertically x 4 horizontally = 24 units, are assembled into a unit case (41) to form one unit.

Further, these units are combined, for example, 7 vertically x 5 horizontally = 35f, to form a block, 5 of these blocks are arranged horizontally to form a sub-module, and these sub-modules are combined 9 vertically x 4-36 horizontally. As a result, a large display device measuring, for example, 25 m in length x 40 m in width is formed.

The total number of elements in this case is 36x 5 x 35x
24 = 151.200 pieces. Furthermore, the number of pixels is approximately 450,000, which is three times this number.

In addition, Fig. 13 shows a front view (A) and a cross-sectional view (A) of the entire device.
B) is shown. The entire structure is, for example, a building with a height of 42 m and a width of 47 m, and the upper part of the building is used as a display section, and this part has nine floors with each floor having a height of 2.688 m. Each floor is provided with four submodules horizontally. In addition, a stage for special events, a waiting room, and a central control room for display and operation of the stage are provided at the bottom.

A display device is thus formed. In this case, as mentioned above, a unit is constructed of, for example, 24 fluorescent display elements, and assembly is performed using this unit, making the device easy to handle and easy to assemble. . In addition, the unit is approximately 40c+ in length and width in the above example.
It is configured as w.

Furthermore, the flow of signals in the above-mentioned display device will be explained below.

In Figure 14, force/ra (101), VTR (1
02), a video signal from a signal source such as a tuner (103) is selected by an input changeover switch (104). This video signal is, for example, an NTSC composite signal,
This signal is supplied to a decoder (105) and red, green,
It is considered to be the three primary color signals of blue. These three primary color signals are sent to AD conversion circuits (10611), (106G), and (106G), respectively.
6B) and is converted into, for example, an 8-bit parallel digital signal.

Each of these digital signals is stored in memory for l fields.
(171B) (171G) (171B) and (172
R) (172G) and (172B) alternately. In these memories, scan line conversion is performed to form 4 scan lines from 5 scan lines each, and further, for example, for each field of 189 scan lines, 1 is converted for every 3 scan lines. A total of 63 (x8 bit parallel) outputs are taken out.

The order of extraction here is such that the signal is completed for each unit as described above. In other words, when there are two adjacent units as shown in FIG. 15, the digital values of pixels corresponding to each cell are sequentially taken out from one memory in the order of numbers assigned to each cell in the - field, and the left unit is 3 scanning lines (201-204) (205-2
08) After the extraction of pixel data corresponding to (209 to 212) is completed, the 3 scanning lines (2
13~216) (217~220) (221~2
24) is taken out and sequentially moved to the right unit. It should be noted that the scanning lines indicated by dashes are fetched from the other memory into the next field by interlaced scanning.

The data of each of these inner elements is stored in each memory (171R) (
171G) (171B) or (172R) (17
2G) (172B) at the same time. Moreover, every three pieces 63 are taken out at the same time. This extracted data is supplied to the data selector (10B).

This data selector (10B) selects red, edge, and blue data for each field from the memory on the side that is not being written in dot sequence, and 63 (x8 bit parallel) data signals are generated. It is formed. These data signals are supplied to a multiplexer (109) to
The bit-parallel signal is converted into a serial signal, and the converted signal is supplied to an optical converter (110') to be converted into an optical signal.

The optical signals of 63 three scanning lines formed in this way are transmitted to the optical fiber cables (301) and (302), respectively.
) ... (363) through the horizontal arrangement of each unit of the display device (401) (402) ... (463
) is transmitted to the central position.

Further, for example - in the horizontal arrangement (401) of the units on the upper side, the optical signal from the optical fiber cable (301) is fed to the photoelectric converter (111) and converted into an electrical signal. The signal is supplied to the demultiplexer (112) to convert the serial signal to 8-bit parallel.This data signal is sent to the pass line (112).
For example, 100 units (114z ) (1142)... (114xo
, o ) in parallel.

Also, the signal from the photoelectric converter (111) is sent to the synchronous separation circuit (
115), and a synchronization signal according to a predetermined pattern or the like is separated. This synchronization signal is used by the timing generation circuit (1
16) and inverts every field as shown in FIG. 16A, FIG. 16B
Half period of frame pulse (1 field) as shown in
unit clock (255 cycles are formed during
(UCK), pixel clock (ECK) in which 38 cycles are formed between two cycles of the unit clock as shown in FIG. 16C, 1i! for each inversion of the frame pulse as shown in FIG. 16C. ! A start pulse (SSP) is generated based on the second element. This frame pulse, unit clock, and pixel clock are passed through the hash line (113) along with the data signals mentioned above to each unit (114x) (1142-)...((
114100) in parallel, and the start pulse is 1
It is supplied to the second unit (114 units).

Something similar is done in each of the 63 horizontal arrays.

In these units, the internal signal system is
It is configured as shown in Figure 7. In the figure, a 38-stage shift register (121) is provided, and the pixel clock (ECK) from the above-mentioned timing generation circuit (116) is supplied to the clock terminal of the register (121), and a start pulse (SSP) is supplied. It is supplied to the data terminal of the register (121).

As a result, each stator in the register (121) receives signals S1 and S2 that are shifted sequentially as shown in FIG. 16E.
...33B is obtained. 31-33 of these signals
s is the pixel (201) of each cell (201) to (212), respectively.
R) (201G) (201B) (202R) (
202G) (202B)... (212R) (2
12G) (212B) and each cell (201') to (
212') (201'R) (202'G) (20
1'B) (202'R) (202'G) (202
'B) ---(212'R) (212'G) (2
12'B). Note that the circuits inside the dashed dotted lines in the figure are the same.

In addition, data signals as shown in 8816 Figure F from the pass line (113) are transmitted to pixels (201R) to (212'B).
) in parallel. Also, frame pulse (FP)
is supplied to the pixels (201R) to (212B), and the phase is inverted by the inverter (122) to supply the pixel (201R) to (212B).
'R) to (212'B). Furthermore, the signal 33B from the register (121) is sent to the D flip-flop (
123) to form a start pulse (SSP') which is supplied to the next unit as shown in FIG. 16G.

Further, in each pixel, the internal signal system is configured as shown in FIG. In the figure, an 8-bit latch circuit (131) is provided, and a data signal from a pass line (113) is supplied to a data terminal. In addition, the frame pulse (FP) or its phase inverted signal and the signals 81 to 8
36 is supplied to an AND circuit (132), and this AND output is supplied to a control terminal of a latch circuit (131). Furthermore, an 8-bit down counter (133) is provided, and the output of the launch circuit (131) is supplied to the present terminal. Also, the load pulse (signal 538) from the shift register (121) is supplied to the load terminal of the counter (133), and the unit clock (UCK
) is supplied to the clock terminal of the counter (133).

An output signal indicating that the contents of this counter (133) are not all 0 is taken out and used as the drive signal for the first grid. In addition, the phase of the signal indicating that the signal is not all 0 is inverted by the inverter (134) and sent to the counter (133).
) is supplied to the count inhibit terminal.

Therefore, in these units and pixels, signals 81 to
At the timing of signal 83g, the data from the pass line (113) is latched into the latch circuit (131) of each corresponding pixel, and at the timing of signal 3311, the data from the pass line (113) is latched by the latch circuit (131) of the corresponding pixel.
This counter (133) is all 0.
The counter (133) generates a PWM signal corresponding to each piece of data by counting down until it becomes . Here, the counter (133) is the unit clock (
Since the unit clock has 255 cycles between 1 fields, 1 field is continuously lit at the maximum value of data, and 256 gradations are obtained from then on until no light is lit. The first grid of each pixel is driven by this PWM signal.

Further, a start pulse for the next unit is generated at the timing of the signal S3s, and thereafter, the same operation is sequentially performed for the 100 horizontally arranged units. In addition, the data to each unit is latched using the unit clock (UCK).
It takes 200 cycles for 100 horizontally arranged units. Therefore, the remaining 55 cycles can be used to transmit special control signals such as synchronization signals and signals.

Also, in the next field, the frame pulse (FP)
By inverting , a similar operation is performed for the other pixel in interlaced scanning. At this time, the preset pulse is repeatedly supplied to the previous pixel, so that the same display is performed twice in each field in each pixel.

As a result, display is performed using 100 units arranged horizontally. Furthermore, by performing this in parallel for 63 units in the vertical direction, the entire image is displayed.

Furthermore, in the above-described apparatus, the drive circuit for each fluorescent display element is constructed as shown in FIG. In the figure, the above P
Red, edge, and blue PWs from the WM signal formation circuit (500)
The M signal is a switch transistor (501R),
It is supplied to the bases of (501G) and (501B). These transistors (501R), (501G), (5
01B) are grounded, and the collectors of each are connected to a high resistance resistor, e.g. 100Ω resistor (502R
), (502G), (502B) of each pixel.
Connected to grids (G 1 *), (GtG), and (Gta). Further, the voltage sources (503) of, for example, 50V connected to the second grid (G2) each have a high resistance, for example, 10V.
0Ω resistor (504R), (504G), (504
B) through transistors (501R), (501G)
, (501B).

Furthermore, the cathode (K
R), (Ko), (Ks+) are heated, and the emitted electrons (emissions) are transferred to the first grid (GIR), CG
Through the 1st Grind (G□B) and the 2nd Grind (G2),
A fluorescent target (anode) (TR), ('
rG), (TI+), and the phosphor emits light. Along with that, transistors (501R), (501G
), (501B), and when the transistors (501R), (501G), (501B) are on, the first grid (G sn ), (GzG), (G
tn) voltage becomes Ov, the voltage at the root, cathode (KR), (K
c), the first grind (GIR), (G 1a ), when the emission from (Kl) is blocked and the transistors (501R), (501G), (501B) are off;
When the voltage of (G111) becomes, for example, 3■ or more, emissions are radiated toward targets (TR), (TG), and (Ts), and luminance transformation is performed by PWM.

And in this circuit, the first grid (GIR),
(G 1a ) and (01m) D are connected to high resistors (of 100Ω and
504R).

(502R), (504G), (502G),
(504B), (502B), the respective grid currents (IGR), (IGG), (■
■) becomes a constant current.

In this case, the cathode current (I
k), a target current (IT) proportional to brightness, and a grid current (IG) have the following relationship: tk=IG+BT. On the other hand, Ik and IG are Ic=(1-η) lh where the aperture ratio of the grid is η. Therefore, by modifying these equations, η is obtained, and the target current related to brightness is a value proportional to the grid current.

Therefore, in the circuit described above, the grid current (IGR),
By making (IGG) and (IGB) constant current,
The target current becomes constant and the brightness becomes constant.

That is, the first grid (GIR), (Gzc), (
Gze), resistor (504R
), (502R), (504G), (502G),
Since the values of (504B) and (502B) are sufficiently large, the extra emissions due to cathode variations are
The target current absorbed by the grid and reaching the phosphor becomes constant.

In addition, resistors (504R), (502R), (504G
).

(502G), (504B), (502B), the constant current effect will be the same even if 200 Ω is provided in only one of them, but the resistors (502R), (502G), (500
2B), the transistor (501R)
, (501G), and (501B), it is necessary to increase their withstand voltage. Furthermore, if only the resistors (50411), (504G), and (504B) are used, there is a risk that the transistors (501R), (501G), and (501B) will be destroyed due to discharge from the display surface side. For protection against
It is appropriate to divide the resistor into two parts.

Furthermore, resistors (502R), (504R), (502
G).

Although there is a possibility that the constant current may vary due to variations in (504G), (502B), and (504B), this problem does not occur as long as a commercially available resistor with an error of within 5% is used.

In this way, a gigantic image measuring, for example, 25 m in height x 40 m in width is displayed, but according to the above-mentioned device, data is transmitted continuously for each unit, and the data transmission to the - display unit ends. Since the data is later transmitted to the next adjacent display unit, the display operation is completed in each unit. For this reason, wiring between units requires a start pulse (SS) from the previous unit to the next unit.
Only one line for transmitting P) is required, making the connection extremely simple. Note that data signals and the like may be connected to the pass line using multiple connectors.

Therefore, when installing or replacing the unit, the work becomes simple, and assembly and repair become easier. That is, for example, if one unit breaks down, all you have to do is bring in a replacement unit and replace it with the faulty unit. Since the number of lines to be connected at this time is small, replacement can be performed quickly and easily. Furthermore, the risk of accidents due to connection leakage, etc. is also reduced.

Also, as an emergency, by simply bringing a counter capable of counting 38 times and connecting it between the input and output of the start pulse, the failed unit can be removed without affecting other parts. Furthermore, it is suitable for unit inspection because the signal is completed within the unit.

- Furthermore, since data is transmitted in parallel for each horizontally arranged unit, the transmission speed is reduced. For example, the data transmission speed with a flat cable (pass line) is 8 60 x 255 x = 290.7 It becomes kHz,
It is below the allowable range (300kHz).

In addition, two fields of interlaced scanning are sent between frames, and data is rewritten to each pixel only once per frame, but display is repeated for each field, and the display frequency is Since the frequency is 60 Hz, the occurrence of flicker can be suppressed.

Furthermore, in the above-mentioned apparatus, the first grid current is used. However, in the case of this apparatus, the entire apparatus is installed outdoors, and the fluorescent display elements and the like are exposed to wind, rain, and direct sunlight. For this reason, fluorescent display elements and the like need to be installed extremely stably, and on the other hand, since the number of such elements is as large as 100,000, it is also necessary to be able to easily install them during manufacturing.

In addition, regarding the unit shown, for maintenance inspection etc.
It is necessary to attach and detach them safely and easily, and it is also necessary to supply signals to these units 7) stably and easily.

Furthermore, since the device is huge, it is necessary to be able to easily find the location in the event of a failure of a unit or the like.

Additionally, since the device is generally installed in a commercial area rather than in front of the audience, it is necessary to ensure that viewing is not obstructed by reflections of sunlight or the blue color of the sky, and due to the structure, there is a gap between the fluorescent display elements. Therefore, it is necessary to prevent the display from becoming discontinuous, especially in the upper direction.

Furthermore, due to the structure, there is a risk that the fluorescent display direction will become heavy hot water, and a means for efficiently cooling this is also required.

OBJECTS OF THE INVENTION In view of these points, the present invention is intended to enable good display with a simple configuration.

SUMMARY OF THE INVENTION The present invention provides a structure in which a plurality of fluorescent display elements are arranged in an X-Y matrix 5 and housed in a case, and signals are supplied to the plurality of fluorescent display elements through a connector from the back of the case. The display device is characterized in that a protective case with an opening at the bottom is provided around the connector portion, and according to this, good display can be performed with a simple configuration.

Embodiment FIG. 20 shows the configuration of the unit. A is a rear view with the rear cover removed, B and C are partially cutaway side and bottom views, respectively, and D is a front view.

In this figure, a unit case (600) is a case made of a strong material such as glass-filled polycarbonate resin, and 24 windows (601) are arranged on the front side of the unit case (600).
This window (601) is provided in a Y matrix shape and
Projections (602) for positioning the fluorescent leather element (40) are provided vertically and horizontally on the back side of the frame around the frame. Each part partitioned off by the protrusion (602) has one element (
40), each of whose display surface is a window (601)
You will be faced from the front.

And this unit case (600) has a fluorescent display element (
40), first place the case (600) horizontally with the back facing up, apply fluid resin (603) such as silicone rubber to the back side around each part (601),
Thereafter, the element (40) is pushed in from the back side. In addition, the window (6
There is a resin (603) window (601) around the back side of 01).
A protrusion (604) is provided to prevent seepage. Further, the resin (603) is applied with a tool using air pressure. Furthermore, a plastic film (605) of a predetermined thickness may be placed on the display surface of the element (40) facing the window (601).

In this state, the resin (603) is cured by heating, for example, in a furnace.

Furthermore, the heavy voltage terminal (12) of each fluorescent display element (40) is
Notch (not shown) provided in a predetermined part of the protrusion (602)
They are sequentially connected to each other by spot blast welding or the like via the weld line, and the resin (603) is applied again on this weld line, and in this state, the resin (603) is heated again in the furnace to harden the resin (603).

This allows the element (40) to be easily and reliably attached to the case (600). The cured silicone rubber has excellent insulation and waterproof properties, as well as good heat dissipation and heat resistance. Furthermore, the high voltage terminal (12) is well insulated.

Further, by disposing the plastic film (605), raindrops do not directly hit the display surface, which becomes hot during display, and there is no risk of damage due to rapid cooling.

Also, on the back side of the case (600) is a rear cover (606).
) is installed with its joint portion waterproofed with a sealing member (607) such as rubber. A bolt (80B) is provided on the protrusion of the cover (606), and is attached to the structure forming the submodule directly or via a fixture described later.

In other words, FIG. 21 shows the state in which the unit case (600) is attached, viewed from the back side, and shows the column (7) of the structure.
01) are provided at predetermined intervals, and 1
The second unit is installed, and the unit between them is attached to the pillar (701) via the approximately H-shaped fixture (702).
mounted on.

Therefore, in this device, the fixture (702) is attached to the column (70
1), the central unit (600a
) can be removed. In addition, the unit (600
With a) removed, both units (600b),
(600c) can be removed.

As a result, each UNISO 1-(600) can be stably attached and can be removed extremely easily for maintenance, inspection, etc.

Also rear cover (606) and unit case (600)
A circuit board (611) is inserted from the case (600) side through the legs (609) and (610).
), (612) are provided, and a signal processing circuit is provided on the back side substrate (612), and the front side substrate (61
1) is provided with a drive circuit for the fluorescent display element (40).

Furthermore, as shown in FIG. 22, the back side of this board (612) is arranged so as to be in contact with the inner surface of the cover (606), and a receptacle (613) for signal supply provided on this board (612) , (614) are exposed on the back side through an opening provided in the cover (606). Further, a protective case (619) having an opening at the bottom is provided around the opening of the cover (606).

External connectors (617) and (61B) connected to the signal cables (615) and (616) are coupled to the receptacles (613) and (614).

Therefore, in this device, the signal cables (615), (6
16) is very easily connected to each unit, and
Since a protective case (619) is provided, there is little risk of raindrops, dust, etc. entering this connection, and it also has high mechanical strength against external shocks, so there is little risk of damage. Become.

Therefore, there is no need to use harmful connectors such as Cannon connectors, and stable connections can be made using ordinary receptacles and connectors for electronic devices.

Wear.

It should be noted that a sealing material such as rubber may be provided around the opening of the rear cover (606), a lid with a gap for passing only the cable through the protective case (619), or a lid may be installed on the protective case (619)
You can also make it more water resistant by covering the whole thing with a waterproof bag or the like.

Further, around these receptacles (613) and (614), light emitting elements (620R) and (620
G), (620B) are provided. These light emitting elements (
620R) to (620B), for example, as shown in FIG. As shown in the figure, the three colors red, green, and ■ are independently connected to the NOR circuit (621R), (621G), (621B)
Alternatively, the light may be supplied to the light source and each light may be emitted.

Therefore, in this device, when displaying an entirely white image, the output of the PWM signal forming circuit (500) is outputted as active low, and therefore, in Masatomi operation, the entire power of the Noah circuit (621) becomes low and emits light. Element (620R)
- (620B) are lit. On the other hand, if even one malfunction occurs, the light emitting elements (620R) to (620B) are turned off.

This allows the operator to place the light emitting element (6) on the back side of the device.
It is possible to find the unit whose lights are off (20R) to (620B) and perform work such as replacement or repair.

Note that the light emitting elements (620R) to (620B) are red, edges,
When each blue signal is detected, for example, when only the blue light is off, repair may not be performed.

Further, in the above example, the output of the PWM signal forming circuit (500) is malfunctioning, but in addition, the display element (40)
If you also want to detect abnormalities, do the following.

For example, if the meat surface is monitored at a monitoring station set up far away and an abnormality is found in some units, the screen will be erased and the width of each unit will be A video signal of the cursor is formed and displayed. As a result, the light emitting element (62011
) ~ (620B), follow the lit units in the horizontal direction, and find the light emitting element (620R) of the upper unit ~
(620B>) If a lit unit ζ is found, it becomes the intersection of the cursors, that is, the unit in which the abnormality was discovered.

In addition, in the unit case (600) shown in FIG.
is provided. Furthermore, the upper surface of this eaves 622) is painted black, and the lower surface is provided with a mirror surface (623).

Therefore, in this device, even if sunlight S from the sun, blue sky, etc. are incident on the display screen, these lights are very 62
2) and is reflected on the display surface of the display element (40), so that viewing is not obstructed.

In addition, the displays a, b, and c on the display surface are reflected by the mirror surface (623), and virtual images a/, b/, and c' are formed, thereby eliminating discontinuity in the display in the top direction.

Further, this device is formed of submodules as described above, and is assembled by attaching them to a building. In this case, each sub-module is provided with a space of a predetermined width on the back side, as shown in FIG. 26, in which a high-voltage power source (703) and the like are provided, and a passage (704) for the worker is secured.

Furthermore, this submodule has a unit case (
600) is attached to the pillar (702), a gap is provided between each unit case (600), and on the rear side, the floor, ceiling, and back are almost sealed by the wall (705). configured.

Therefore, an opening is provided in a predetermined portion of this rear wall (705), and a fan (706) is attached.

By driving this fan (706) to let air flow in, the air pressure inside the submodule surrounded by the wall (705) is stabilized, and the air with this crystallized air pressure is transferred to each unit case (600). It will gush out from the gap between them.

As a result, when viewed from above, convection occurs as shown by the arrows in FIG. 27, and the display surface of each display element is cooled by the flow of air.

Note that the fan (706) is configured to control the submodule, for example, to
When installing it on a pillar (800) of a building as shown in Figure 8,
It suffices to install it at about two locations between them.

Effects of the Invention According to the present invention, it has become possible to perform good display with a simple configuration.

[Brief explanation of drawings]

1 to 19 are diagrams for explaining a display device previously proposed by the applicant, and FIGS. 20 to 28 are diagrams for explaining the present invention in detail. (600) is a unit case, (603) is a resin, (6
06) is the rear cover, (612) is the circuit board, (613)
), (614) is the receptacle, (619) is the protective case, (620) is the light emitting element, (622) is the eaves, (6
23) is a mirror surface, (701) is a column, (702) is a fixture,
(706) is a fan. Preload in the drawings (no change in content) Fig. 1 Fig. 2 Fig. 3 Fig. 5 Fig. 2ff 4 5 1tz Fig. 7 Fig. 8 Fig. 6 Fig. 5 Fig. 9 Fig. 22 Fig. 23 Fig. 25 Fig. 27 Figure No. 1 Procedural Amendment 1. Display of the case Patent Application No. 82255 of 1982 2, Title of the invention Display device 3, Person making the amendment Relationship to the case Patent applicant representative director Norio Ohga

Claims (1)

[Claims] In a display device in which a plurality of fluorescent display elements are arranged in an X-Y matrix and housed in a case, and signals are supplied to the plurality of fluorescent display elements through a connector from the back side of the case, the connector portion A display device characterized in that a protective case with an opening at the bottom is provided around the casing.