JPS60225883A - Display panel - 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 has 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 same figure, +11 is the front panel (1^), back plate (IB), side &
A glass tube made of (IC) is shown, and this glass tube (
1) a plurality of fluorescent display segments 1 comprising a phosphor layer therein;
21 ((2R), (2G), (2B)) and a plurality of cathodes (K) ((KR),
(Ko ), (KB ) ) and the first grid (control electrode) (Gz ) ((GIR), (G 1o ), (
Gls)) and a common second grid (acceleration electrode (G2)
will be arranged. The fluorescent display segment (2) is located on the front panel (
It is formed by depositing a phosphor layer on the inner surface of the IA), and in this case, three phosphor-emitting segments l-(2R), (2G), ( 2B) is formed. Specifically, as shown in Figure 5, the front panel (1^)
A carbon layer (3), which is a conductive layer, is printed on the inner surface of the frame in the form of a frame, and a red phosphor layer (2R) and a green phosphor layer, which become each display segment, are printed corresponding to each blank space within the frame. Light layer (2G)
A blue phosphor layer (2B) is formed by printing so as to partially extend over the carbon layer (3), and a metal back layer (5) made of aluminum, for example, is formed on the front surface of the layer through an intermediate MfJ4 (41). The display segments (2R), (2G), (2B) are formed by each phosphor layer.
), and the wire cathodes (KR), (Kc), (Kn) are placed on the inside of the back panel (IB), respectively, and the wire cathodes (KR), (Kc), (KB), respectively, are placed on the inside of the back panel (IB), facing the 1st grid (GIR), (Gtc), (
Gts) and three first grids (GiR)
, (G IG ), (Gla) have the second grid (
G2) is placed. 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), (Kc), (KB)1
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 cup,
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). As a result, even if the wire cathode expands due to temperature rise, the expansion is absorbed by the spring section (7a).
The wire cathode will not loosen. Each of the first grids (GIR), (GIG), and (Gu+) is formed in a semicylindrical shape with a cylindrical surface facing each wire cathode, and is spaced at a predetermined pitch along the longitudinal direction of the cylindrical surface. 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) is
It is constructed by forming slits (9) at the same positions as the slits (8) of the first grid in the portions corresponding to the grids (01n), (GIG), and (GIB). 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 GzG) and (GIB). In this case, the electron beam from the wire cathode is emitted linearly through the slits (8), (9) of the first and second grids 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 may be formed horizontally as shown in FIG. At this time, the electron beam passes through the second grid and is emitted so as to be bent somewhat inward in the longitudinal direction of the slit, as shown by the dotted line (30').

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 emission occurs when the electron beam from the cathode hits the first or second grid (Gz), (G2) and the secondary electrons (31) (see Figure 6) from it strike the adjacent fluorescent display segment. A shield to prevent light emission and a function to spread the electron beam (30) from each wire cathode (K) so that the entire corresponding fluorescent display segment (2) is irradiated. It serves to form a so-called diffuser lens, and at the same time is used as a power supply means for applying a high voltage, for example 10 kV, to each fluorescent display segment. During assembly, the separator α is supported between the surface panel (l^) of the glass tube (1) and the side plate (IC) and fixed by a frit. That is, as shown in FIG. 7, the separator Ql forms a rod partitioned into three parts so that each fluorescent display segment is surrounded, and one of the upper end portions of the separator Ql has a bar shape extending outward from each other on opposite sides. Supporting 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 Ql is inserted into the side plate (IC) of the glass tube body from above, the supporting claw (11) just contacts the upper end of the side plate (IC) and the separator is supported, as shown in FIG. At the same time, the bent part (
13) is brought into contact with the inner wall of the side plate (IC) so that the separator is located at the center. Furthermore, a protrusion (14) bent inward is provided at the upper end of the separator aΦ, and a protrusion (15) is provided on the surface of the protrusion (14). This protrusion (15) comes into contact with the carbon layer (3) when the separator αψ is housed inside the side plate (IC) and the surface panel (1^) is laminated and sealed on the side plate (IC). (9th
(see figure).

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,
The anode lead (12) to which high voltage is applied is led out through the sealing portion between the front panel (IA) and the upper end surface of the side plate (IC). In addition, the wire cathode (K) lead, the first grid (G1) lead, and the second grid (G
The leads of 2) are guided to the outside through the sealing portion between the back plate (IB) and the lower end surface of the side plate (IC). In addition,
A plurality of leads of each of the cathode (K), first grid (G1), and second grid (G2) are led out in order to also serve as support. For example, each first grid (GIR), (G
lo), (GIB) have two leads each on the inner surface, for a total of four leads (16Gz), (17Gz), (18Gt
) is derived. The second grid (G2) has four leads (19G2) corresponding to the four corners of the back panel.
) is derived. Also, the cathode (K) lead (20F
) are led out from each support member (6), (7) in a plurality to the left and right. and each cathode lead (20F
) are commonly connected to each support member (6) and (7), respectively,
Also, corresponding leads of the first grid (G1) and the second grid (G2) are commonly connected.

The glass tube body (1) has a front panel (IA) and a side panel (IC).
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 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 the anode lead (12). Matashitei 1 grid (G
IR), (Glo), and (GIB) each have, for example, Ov~
A voltage of 30V is applied, and a voltage of 300V, for example, is applied to the second grid (G2). Wire cathode (
KR), (Ko), (Kn) are 60-79m per piece.
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 Ov 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 a voltage of, for example, 30 mm 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 display the corresponding display segment (2). Hit the phosphor to make it emit light.

At this time, the voltage (30V) applied to the first grid (G1)
Emission brightness is controlled by controlling the pulse width (application time) of . Then, as shown in Figure 6, the cathode (K
) is spread by the separator and irradiated onto the entire surface of the display segment (2). Also, the electron beam from the cathode hits the first grid and the second grid, and the secondary electrons from the first grid and the second grid (31)
However, these secondary electrons (31) are blocked by the separator frame and do not hit the adjacent display segment (2). By selectively controlling the voltage of the first grid in this manner, each display segment l-(2R),
(2G) and (2B) are selectively displayed with high 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 (IA) side, dangers during discharge and wiring are avoided, and a stable light-emitting display can be obtained.

In particular, since a separator Ol to which an anode voltage is applied is arranged so as to surround each fluorescent display segment (2), a diffusion lens is constituted by this separator Q@, and only the first grid (G1) has a curvature. , even if the second grid (G2) is flat (in the case of $6F!!J), the electron beam from the cathode (K) spreads in the lateral direction (slit direction) and is irradiated onto the entire surface of the display segment (2). Ru. At the same time, the first grid or the second
Secondary electrons from the grid are blocked and do not cause adjacent canted-off display segments to emit light.

In addition, 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-limited 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, green cathode (KG
) for red and blue cathodes (KR) and (Ka
) shall be one each. As a result, the total amount of electrons for green, for example, becomes larger than those for red and blue, allowing color display. Of course, using multiple red and blue cathodes also has the effect of lengthening the lifespan. 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 wires are installed with a distance of about 0.8 to 1++w+, and although the amount of electron emission will not be twice that of one wire due to the electron repulsion effect, it can be expected to increase by 70% to 80%. Incidentally, 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 the wire cathode is used in a temperature-limited region, that is, the cathode loading of the oxide cathode is used at a temperature of several tens of minutes, so that it does not appear red, the amount of electrons emitted from each cathode is small. One possible solution to this problem is, for example, to wind 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 become loose or vibrate. There is. In consideration of these points, the wire cathode may have a structure similar to that shown in FIGS. 10 and 11. In this example, a core wire (35) made of a heavy hot water material such as tungsten or molybrene is provided, and an insulating material (such as ^I2O3) is provided on the surface of this core wire (35).
36), and then a tungsten wire (37), which serves as a heater, is wound spirally on top of it, and an electron emitting material is placed in the spiral portion! [
(38) 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 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, short circuits between the spirals can be prevented.
It is possible to eliminate problems such as thermal deformation of the spiral part. and 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 together with an increase in the amount of electron emission, resulting in an overall It is possible to increase the allowable amount of current from the true cathode. Curve (1) shows 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 (40) as described above is
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 = 35 to form a block, 5 of these blocks are arranged horizontally to form a submodule, and these submodules are combined 9 vertically x 4 horizontally = 36. . 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 this 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. and! In this case, as described above, a unit is constructed of, for example, 24 fluorescent display elements, and the assembly is performed using this unit, so that the device is easy to handle and easy to assemble. In addition, the unit is approximately 40cm in length and width in the above example.
It is composed of

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

In FIG. 14, a camera (101), a VTR (10
2) 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, a composite signal of the NTSC system, and this signal is supplied to a decoder (105) and converted into three primary color signals of red, green, and blue. These three primary color signals are sent to AD conversion circuits (106R), (106G), and (106B), respectively.
) and is converted into, for example, an 8-bit parallel digital signal.

Each of these digital signals stores one field of memory.
(171R) (171G) (171B) and (172
R) (172G) ('172B) are alternately supplied. In these memories, scan line conversion is performed to form 4 scan lines from each 5 scan lines, and further converted, for example, 189 scan lines in each field, 1 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 the pixels corresponding to each cell are sequentially retrieved from one memory in the order of numbers assigned to each cell in the -glue yield, and the left unit is 3 scanning lines (201-204) (205-2
0B) After the extraction of pixel data corresponding to (209 to 212) is completed, the 3 scanning lines (21
3-216) (217-220) (221-22
The pixel data corresponding to 4) is taken out and sequentially moved to the right unit. Note that the scanning lines between the dashes are taken out from the other memory into the next field by interlaced scanning.

The data of each of these pixels is stored in each memory (171R) (1
71G) (171B) or (172R) (172
G) are taken out from (172B) at the same time. or,
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 sent 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 a central location.

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 supplied to the photoelectric converter (111) and restored to an electrical signal. This restored data signal is supplied to a demultiplexer (112) to convert the serial signal into an 8-bit parallel signal. This data signal is connected to the pass line (11
For example, 1001- units (1141) (1142)... (1141o) arranged horizontally through 3)
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, and one pixel clock is formed for each inversion of the frame pulse as shown in FIG. A start pulse (S S P) is generated. This frame pulse, unit clock, and pixel clock pass through the path line (113) to each unit (
1141) (1142) ... (114zoo)
are supplied in parallel to each other, and a start pulse is supplied to the first unit (1141).

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, from each stage of the register (121), signals S1 and S2 are sequentially shifted as shown in FIG.
...S3s is obtained. 81-33B of these signals
are the pixels (201R) of each cell (201) to (212), respectively.
) (201G) (201B) (202R) (2
02G) (202B)... (212R) (21
2G> (212B) and each cell (201') to (2
12') (201'R) (202'G) (201
'B) (202' R) (202' G) (202
'B) ... (212'R) (212'G)
(212'B). Note that the circuits inside the dashed dotted lines in the figure are the same.

Further, data signals such as those shown in FIG. 16F from the pass line (113) are supplied in parallel to the inner elements (201R) to (212'B). Also, the frame pulse (F P) is supplied to the pixels (201R) to (212B), and the phase is inverted by the inverter (122), and the frame pulse (FP) is supplied to the pixels (201R) to (212B).
~(212'B). Further register (12)
) is applied to a D flip-flop (123) to form a start pulse (SSP') which is applied 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 launch circuit (131) is provided, and a data signal from a pass line (113) is supplied to a data terminal. Also, the frame pulse (FP) or its phase inverted signal and the signals 81 to 33
One of g 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 latch circuit (131) is supplied to the preset terminal. Also, the load pulse (signal 5311) 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 at the impark (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 Sas, the data from the pass line (113) is latched into the corresponding internal latch circuit (131), and at the timing of signal 338, it is preset to the counter (133), and this counter (133) becomes all 0. The counter (
133), a PWM signal corresponding to each data is formed. Here, the counter (133) is the unit clock (UC
Since the unit clock has 255 cycles between l fields, 1 field is lit continuously at the maximum data value, and 2 fields are counted down by K) until it is not lit.
56 gradations are obtained. With this PWM signal, the first
The grid is driven.

Further, a start pulse for the next unit is generated at the timing of the signal 338, and thereafter, the same operation is sequentially performed for the 100 horizontally arranged units. The data to each unit is latched using the unit clock (UCK).
It takes 200 cycles for 100 horizontally arranged units. The remaining 55 cycles can then be used to transmit special control signals such as synchronization 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 for each field j yield in each pixel.

As a result, display is performed in units 1001- 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 grid (GIR), (G ia ), (01!1). In addition, the voltage source (503) of, for example, 50V connected to the second grid (G2) is connected to a high resistance, for example, 100Ω resistor (504R), (504G), (504G), (503)
04B) through the transistors (501R) and (501
G), is connected to the collector of (501B).

Furthermore, the cathode (K
R), (Ko), and (Ke) are heated, and the emitted electrons (emissions) are transferred to the first grid (GIR), (G
1G), (GIB), through the second grid (G2),
For example, a fluorescent target (anode) (TR), (TR) to which a voltage of 10 kV from a high voltage terminal (506) is applied
To) and (TB), and the phosphor emits light. Along with that, transistors (501R), (501G),
(501B) is supplied with a PWM signal, and the transistor (
501R), (501G), (501B) are on, the first grid (G > R), (GIG), (Gzs)
When the voltage of becomes Ov, the cathode (KR), (Kc)
, (Km) is blocked and the first grid (Gli), (G 1a ), (G
zi) (When the D voltage becomes, for example, 3V or more, the emission is radiated to the targets (TR), (TO), and (Ti), and brightness modulation by 7PWM is performed.

And in this circuit, the first grid (GIR),
(GIG), (Gum) d is 50V (7) voltage source (5
03) Karanomi pressure, *4100100kQrDf6'
a (5041?).

(502R), (504G), (502G), (50
4B), <5028), so each grid current (IGR), (Iaa), (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 a relationship of 1k=IO+IT. On the other hand, Ik and 1. is 1o=(1-η)Ik, where η is the aperture ratio of the grid. 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 above circuit, the grid current ('IGR)
, (Iaa), and (J an ) are made constant currents, so that the target current becomes constant and the brightness becomes constant.

That is, the first grid (GIR), (GIG), (G
ζ for the impedance of le), resistor (504R)
, (502R), (504G) , (502G), (
504B) and (502B) are sufficiently large, so
Excess emissions due to cathode variations are absorbed by the first grid, resulting in a constant target current reaching the phosphor.

In addition, resistors (504R), (5021?), (504
G).

(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. In addition, if only the resistors (504R), (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, etc.). 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.

Ru. Therefore, the only wiring between the units is the l line that transmits the start pulse (SSP) from the previous unit to the next unit, making connection extremely easy. 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, a replacement unit can be brought in and replaced 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.

Historically, since data was transmitted in parallel for each horizontally arranged unit, the transmission speed was reduced. For example, the data transmission speed with a flat cable (pass line) was 8 60 x 255 x - = 290. 7k)lx, which is less than the allowable range (300k)lx).

In addition, two fields of interlaced scanning are sent per frame, and data is rewritten to each pixel only once per frame, but display is repeated for each field, and the display 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, the fluorescent display elements and the like must be installed extremely stably, and on the other hand, since the number of such elements is as large as 10 or so, it is also necessary that they can be easily installed during manufacturing.

In addition, regarding the unit shown, for maintenance inspection etc.
They need to be installed and removed safely and easily, and it is also necessary to be able to stably and easily supply signals to these units.

Furthermore, since the apparatus is huge, it is necessary to be able to easily locate the failure of a unit or the like.

Additionally, since the equipment is generally installed at a higher location than 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 temperature may reach III+ temperature, 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 an MS configuration.

SUMMARY OF THE INVENTION The present invention provides a method for combining a large number of units including a plurality of fluorescent display elements.
- In a display panel that is arranged in a Y matrix to form a large X-Y matrix panel, each of the above units is fixed to a plurality of columns sequentially at least every other, and the units in between are fixed to the columns on both sides using connecting fittings. This provides a display panel in which each of the above-mentioned units can be removed from the back surface, and with this, good surface layering can be achieved with a simple configuration.

Embodiment FIG. 20 shows the structure of the unit, in which 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 stop view.

1 In this figure, the unit case (600) is a case made of a strong material such as glass-filled polycarbonate MIJ resin, and there are 24 windows (601) on the front of the unit case (600).
) are provided in an X-Y matrix, and this window (
601) on the back side of the frame surrounding the fluorescent display element (40).
Projections (602) for positioning, etc. are provided vertically and horizontally. Each part divided by this protrusion (602) has 1f-
A destination element (4o) is provided, and each display surface faces the front side through a window (601).

And this unit case (600) has a fluorescent display element (
40), first place the case (600) horizontally with the back facing up, and apply fluid resin (603) such as silicone rubber to the back side around the goodwill (601).
After that, push the element (4o) 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) having a predetermined thickness may be placed on the display surface facing the window (601) of the element (4o).

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

Furthermore, a pressure terminal (12) for each fluorescent display element (40),
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 through the welded parts, and the resin (603) is applied again on this welded part, 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 will not directly hit the display direction, which is at a high temperature 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 (60B) is provided on the protrusion of this 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. Also, unit l-(60
With 0a) removed, remove the units (600b) on both sides.
, (600c) can be removed.

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

Also rear cover (606) and unit case (600)
The circuit board (all
), (612) are provided, and the back side substrate (612)
A signal processing circuit is provided on the front board (6).
11) 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 (618) 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 a quadrivalent connector such as a cannon connector, and a stable connection can be made using ordinary receptacles and connectors for electronic devices.

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)
Water resistance can also be increased by covering the entire body with a waterproof bag or the like.

Furthermore, 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 blue are independently connected to the NOR circuit (6211?), (621G), (621B).
), and each may emit light.

Therefore, in this device, when a completely white image is displayed, the output of the PWM signal forming circuit (500) is outputted as active low, and therefore, in normal operation, the full power of the Noah circuit (621) is low and the light is emitted. 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, green,
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 a monitoring station located far away monitors the inner surface of a unit and detects an abnormality in some units, the screen will be erased and the width of the unit will be Forms and displays a cursor video signal. As a result, on the back side, the light emitting element (620R)
Follow the lit units of ~(620B) in the horizontal direction and find the light emitting elements of the upper and lower units (620R)~(
620B) 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 canopy (622) is painted black, and a mirror surface (623) is sunk into the lower surface.

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), the light is not reflected on the display surface of the display element (40), and viewing is not obstructed.

In addition, the display a% b% c on the display surface is reflected by the mirror surface (623), and virtual images a', b', and C' are formed, thereby eliminating the discontinuity of the surface leather in the upper-upper 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 rear 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 ensured.

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

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 internal pressure inside the submodule surrounded by the wall (705) increases, and this increased air pressure flows between each unit case (600). It will gush out from the cracks.

1 This causes convection as shown by the arrows in FIG. 27 when viewed from above, and the display surface of each leather 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 the drawing]

FIGS. 1 to 19 are diagrams for explaining the leather device previously proposed by the present 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, and (706) is a fan. Figure 1 Figure 2 Figure 3 ■ Figure 5 Figure 7 Figure 8 Figure 6 Figure 9 Figure 22 Figure 25 Figure 27 Figure n Procedural amendment June 15, 1980 1, Incident Indication of 1982 Patent Application No. 82262 3, Relationship with the case of the person making the amendment Patent applicant address Tokyo Parts 6-7-35-8, Contents of the amendment

Claims (1)

[Claims] In a display panel in which a large number of units including a plurality of fluorescent display elements are arranged in an X-Y matrix to form a large X-Y matrix panel, each of the units is sequentially fixed to a plurality of columns at least every other column, and A display panel in which each of the above units can be removed from the back side by fixing the above units to pillars on both sides with connecting fittings.