JPS60225881A - 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.

FIG. 1, FIG. 2, FIG. 3FIIJ, and FIG. 4 are a front view, a cross-sectional view taken along the line A-A, a cross-sectional view taken along the line B-B, and a partially broken perspective view of the fluorescent display element, respectively. Show the diagram.

In the figure, (1) is the front panel (1^) and the back panel (IB)
and a side plate (IC), and inside this glass tube (1) are a plurality of fluorescent display segments (2) ((2R), (2G), (2B)) consisting of a fluorescent layer. and,
Multiple cathodes (K) [(
KR), (Ko), (K lid)] and the first grid (control electrode) (Gl) ((GIR), (Gso),
(G1) 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 1^), and in this case, there are three fluorescent display segments (red, green, and blue) (2R), (2G), (2B). ) is formed. Specifically, as shown in Figure 5, the front panel (1^)
A conductive carbon layer (3) is printed on the inner surface of the frame in the form of a frame, and a red phosphor layer (2R) that becomes each display segment corresponds to each empty space within the frame, and a phosphor layer on the edge is printed. Light layer (2G)
A blue phosphor layer (2B) is formed by printing so as to partially straddle the carbon layer (3), and a metal back layer (5) made of aluminum, for example, is formed on the front side with an intermediate film (4) interposed therebetween. is deposited. Wire cathodes (KR), (Ko), and wire cathodes (Km) are installed inside the back panel (IB) so as to face the display segments (2R), (2G), and (2B) formed by these phosphor layers, respectively. Opposite each wire cathode (KR), (KG), (Km) are the first grids (GIR), (GIG), (Gx
i+) is a mixing valve, and three first grids (G IR)
, (GIG), and (Gta), the second grid (G2
) is placed. Each wire cathode (K) is formed, for example, by coating the surface of a tungsten heater with carbonic acid or salt, which serves as an electron-emitting substance.

Each wire cathode (KR), (KG), (Kn) is stretched between a pair of conductive supports (6), (7) arranged on both sides of the back panel (IB), respectively. One support part (6) is for fixing one end of the 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. As a result, even if the wire cathode stretches due to a rise in temperature, the stretch is absorbed by the spring portion (7a) and the wire cathode does not loosen. Each of the first grids (GIR), (GIG), and (01m) 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 constructed by forming slits (9) at the same positions as the slits (8) of the first grid in parts corresponding to the first grids (GIR), (GIG), and (Gtn). be done. In this case, the slit portions (9R), (9G), (9B) of the second grid (G2)
) are each corresponding first grid (GIR), (GIG)
, (Gzs). In this case, the electron beam from the wire cathode passes through the slits (
8) and (9), is emitted linearly, and is spread out in the longitudinal direction of the slit. 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 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
B) A separator Qllll made of a conductive material surrounding the
is placed. This separator αl allows the electron beam from the cathode to pass through the first or second grid (G1) or (G2).
Secondary electrons (31) from that point (see Figure 6)
A shield is provided to prevent the adjacent fluorescent display segments from emitting light, and each wire cathode (
The electron beam (30) from K) serves to spread the electron beam so that the entire corresponding fluorescent display segment (2) is irradiated, and also serves to form a so-called diffusion lens.At the same time, a high voltage is applied to each fluorescent display segment. For example, it is also used as a power supply means for providing iob v. During assembly, this separator a is supported between the surface panel (IA) and side plate (IC) of the glass tube (1) and fixed by a frit. That is, the separators Ql are arranged in three layers so that each fluorescent display segment is surrounded as shown in FIG.
Support claws (11) protruding outward are provided on one of the opposing sides of the upper end of the bar, and high pressure (anode) is provided on the other opposing both sides. An anode lead (12) for supplying voltage) is led out.

Also, on the side of the separator there is an elastic bending piece (1 piece) for positioning.
3) is excised. Therefore, when the separator a@ is inserted into the side plate (IC) of the glass tube from above, the supporting claw (11) just comes into contact with the upper end surface of the side plate (IC) as shown in FIG. At the same time it is supported, the bent part (
13) is brought into contact with the inner wall of the side plate (1c) so that the separator is located at the center. Furthermore, a protrusion (14) bent inward is provided at the upper end of the separator Ql, and a protrusion (15) is provided on the surface of the protrusion (14). This protrusion (15) comes into contact with the carbon layer (3) just when the separator α is housed in the side plate (IC) and the surface panel (IA) is overlapped and sealed on the side plate (1c).
(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). Also, the wire cathode (K) lead, the first grid (G) 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 (G 1n ), (
GtG), ('Gts) have two leads on each side for a total of four leads (16G1), (17Gt), (18G
t ) is derived. The second grid (G2) has four leads + (19
G2) 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 (2
0F) are commonly connected to each of the support members (6) and (7), respectively, and the 1st grid (Gz) and the 2nd grid (Gz)
In 2), the corresponding leads are commonly connected.

The glass tube body (1) has a front panel (IA) and a side panel (IC).
and the back plate (IB) are sealed with each other by flipping (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), (GIG>, and (Gtn), respectively, 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), (KB) are 60-70m 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 N1 (2) is cut off.
is not displayed. When a voltage of, 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 transferred to the second grid (G2).
) and hits the phosphor of the corresponding display segment (2) to cause it to emit light.

At this time, the voltage (30V) applied to the first grid (G1)
) The emission brightness is controlled by controlling the pulse width (application time). Then, as shown in Figure 6, the cathode (
The electron beam from K) is spread by a separator Ql and irradiated onto the entire surface of the display segment (2). In addition, the electron beam from the cathode hits the first grid and the second grid, and the secondary electrons (3
1) is generated, but this secondary electron (31) is blocked by the separator Ql and is transmitted to the adjacent display segment (2).
Never hit. By selectively controlling the voltage of the first grid in this manner, each display segment (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 Ql to which an anode voltage is applied is arranged so as to surround each fluorescent display segment (2), this separator Ql constitutes a diffusing lens, and has a curvature of only the first grid (G1). Even if the second 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 display segment (2). At the same time, the separator αΦ prevents secondary electrons from the first grid or the second grid from causing the adjacent cut-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 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, a green cathode (Ke
) into two cathodes (KR) and (KR) 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, allowing color display. 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 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, 12 tubes are installed at a distance of about 0.8 to 1III, and although the amount of electron emission will not be twice that of one tube due to the electron repulsion effect, it can be expected to increase by 70 to 80 percent. Incidentally, in order to increase the brightness of the edge, 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 the red and blue layers.

Further, since the wire cathode is used at a temperature in the 111112 temperature range, 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 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. Considering these points, wire cathodes are shown in Figures 10 and 1.
A configuration as shown in Figure 1 can be considered. In this example, the core wire (35
), an insulating material (36) such as Al2O3 is coated on the surface of this core wire (35), a tungsten wire (37) serving as a heater is wound spirally on the core wire (35), and an electron-emitting material ( 38) For example, carbonate is deposited 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 the top and stretching the core wire (35) with a spring part, the tail between the spirals,
Problems such as thermal deformation of the spiral portion can be eliminated. In addition, 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 electron emission is increased, and therefore the amount of current allowed from each cathode can be increased as a whole.Curve (1) shows the temperature distribution.

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

Further, the separator blocks secondary electrons from the control electrode or the accelerating electrode, preventing the canted-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, one unit is constructed by incorporating a plurality of units, for example, length 6 x width 4 = 24 m, into a unit case (41).

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. This entire building 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 the front part, and this part has nine floors with each floor having a height of 2.888 m. It will be done. There are 4 submodules horizontally on each floor.
Each item is provided separately. 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 described above, a unit is constructed of, for example, 24 fluorescent display elements, and this unit is used to assemble the device, making the device easy to handle and easy to assemble. In addition, the unit is 1. In the above example, the length and width are approximately 40 cm.
It is composed of

Furthermore, the flow of signals in the above-mentioned display 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) and (172B) alternately. In these memories, scan line conversion is performed to form 4 scan lines from each 5 scan lines, and further, for example, for each field with 189 scan lines, l 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) (205-20
8) After the extraction of pixel data corresponding to (209 to 212) is completed, the 3 scanning lines (213
~216) (217~220) (221~224
) is extracted 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) (
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 (108) selects red, green, and blue data for each field from the memory on the side that is not being written dot-sequentially, 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) (3G2) respectively.
... (363) through the horizontal arrangement of each unit of the display device (401) (4G2) ... (463)
) is transmitted to the central position.

Furthermore, for example - in the horizontal arrangement of the units on the upper side (401), the optical signal from the optical fiber cable (301) is supplied to a photoelectric converter (111) and restored to an electrical signal. This restored data signal is sent to the demultiplexer (
112), and the serial signal is converted into 8-bit parallel signal. This data signal is connected to the pass line (113
), for example, 100 units (1141) (1142)... (114zoo
) 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), a pixel clock (ECK) in which 38 cycles are formed between two cycles of the unit clock as shown in FIG. A start pulse (S S P) is generated. This frame pulse, unit clock, and pixel clock are transmitted to each unit (1
14z ) (1142) ... (1141oo)
are supplied in parallel to each other, and a start pulse is supplied to the first unit (1141).

1 The same thing is done in each of the 63 water lily 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 a pixel clock (ECK) from the above-mentioned timing generation circuit (116) is provided.
is supplied to the clock terminal of the register (121), and a start pulse (S S P) is supplied to the clock terminal of the register (121).
) is supplied to the data terminal of

As a result, from each stage of the register (121), signals s1 and S2 are sequentially shifted as shown in FIG. 16E.
...338 is obtained. 81-331 of these signals
1 is the pixel (201) of each cell (201) to (212), respectively.
R) (201G) (201B) (202R) (
202G) (202B) --- (212R) (21
2G) (212B) and each -2= le (201')
~(212') (201'R>(202'G) (
201'B) (202'R) (202'G) (20
2'B) ... (212'R) (212'G)
(212'B). Note that the circuits inside the dashed dotted lines in the figure are the same.

Also, data signals as shown in FIG. 16F from the pass line (113) are transmitted to pixels (201R) to (212'B).
2 are supplied 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 register (
The signal 5311 from the D flip-flop (121)
23) 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. Also, the frame pulse (FP) or its phase inverted signal and the signal 5l-3
:aε is supplied to the Andre path (132),
This AND output is supplied to the control terminal of the latch circuit (131). Furthermore, an 8-bit down counter (133) is provided, and the output of the latch circuit (131) is supplied to the present terminal. Also, the load pulse (signal 838) from the shift register (121) is supplied to the load terminal of the counter (133), and the unit clock (UC) is supplied to the load terminal of the counter (133).
K) 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 (13).
3) is supplied to the count inhibit terminal.

Therefore, in these units and pixels, signals 81 to
At the timing of signal 33G, 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.
By counting down until it becomes , the counter (133) forms a PWM signal according to each data. Here, the counter (133) is unit clock <U
Since the unit clock has 255 cycles between one field, one field is continuously lit at the maximum data value, and 256 gradations are obtained from then until no lighting is reached. 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 33B, and thereafter, the same operation is sequentially performed for the 100 horizontally arranged units. Note that data is launched to each unit 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 in each field in each pixel.

Accordingly, display is performed using 100 units arranged horizontally. Furthermore, by performing this in parallel for 63 units in the vertical direction, an image of all one body 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, green, and blue PW 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
The emitters of the 01B) are grounded, and the collectors of the 01B and 01B are connected to a high resistance resistor (502R
), (502G), (502B) of each pixel.
Connected to grids (GIR), (GIG), and (GIB). Also, for example, 5 grids connected to the second grid (G2)
The 0V voltage source (503) is connected to a high resistance, for example, a 100Ω resistor (504R), (504G), (504B).
Transistors (501R), (501G), (
501B) collector.

Furthermore, the cathode (K
R), (Ko), (KB) are heated, and the emitted electrons (emissions) are j81 grid (G IR), (
Through the second grid (G2), a fluorescent target (anode) (TR), (
To) and (Ti), the phosphor emits light. Along with that, transistors (501R), (501G),
(501B) is supplied with a PWM signal, and the transistor (
When 501R), (501G), and (501B) are on, the first grid (GIR), (Gzo), and (GiII
) (7) When the voltage is Ov, the root, cathode (KR), (
Emissions from KG ) and (Km ) are blocked,
Transistor (501R), (501G), (501B
) is off, the first grid (GIR), (Gto)
, (Gts+) (7) When the voltage becomes, for example, 3■ or more,
Emissions are targets (TR), (TG), (TB
) The brightness is radiated and the brightness is varied by PWM.

And in this circuit, the first grid (GIR),
(G IG ), (Gzi+) D is a high resistor (504R) whose voltage from the 50V17) voltage source (503) is 100Ω, respectively.

(502R), (504G), (502G), (50
4B), (502B), so the respective grid currents (IGR), (IGG), (I(1B)
becomes a constant current.

In this case, the cathode current (I
k), the target current (It) which is proportional to the brightness, and the grid current (IG) have a relationship of 1 k - I G + 17 . On the other hand, 1 and Xa are 1G-(1-η)Ik with the aperture ratio of the grid as 1, so by transforming these equations, it becomes η, and the target current related to brightness is proportional to the grid current. The value is

Therefore, in the circuit described above, the grid current (IG), (
By setting Iaa) and (1 port) to a constant current, the target current becomes constant and the brightness becomes constant.

That is, the first grid (G IR), (Gin), (
Gzm), 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), (501B>), it is necessary to increase their withstand voltage. Also, if only resistors (504R), (504G), and (504B) are used, the display screen There is a risk that the transistors (501R), (501G), and (501B) will be destroyed due to discharge from the side, and in order to protect against these, it is appropriate to divide the resistor into two.

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

There is a risk that the constant current will vary due to variations in (504G), (502B), and (504B), but this can be solved by using commercially available resistors with an error of less than 5%.
does not occur.

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, 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 is also reduced.

In addition, as an emergency, a counter capable of counting 38 times can be brought in and simply connected between the input and output of the start pulse to remove the failed unit 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 kHz, which 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 60RZ, 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.
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 vertical direction.

Furthermore, due to its structure, there is a risk that the fluorescent display surface may become hot, and a means for efficiently cooling it 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 is a display device characterized in that a black upper eave is provided above a plurality of display devices arranged one above the other, and the lower surface of the eaves is made into a mirror surface. Good display 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 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) 1 for positioning the fluorescent display element (40), etc. are provided vertically and horizontally on the back side of the frame around the frame. Each part partitioned by the protrusion (602) is provided with one element (40), and each display surface is a window (60).
1) Facing the front side.

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),
After that, push the element (40) in from the back side, and also push the element (40) in from the back side.
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) may be applied with a tool using air pressure, and a plastic film (605) of a predetermined thickness may be placed on the display surface facing the window (601) of the element (40).

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

Furthermore, the high 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 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 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 (, 608) 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 unit (800) 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 thrown, and the board on the back side (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 (61B) connected to signal cables (615) and (616) are coupled to the receptors (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 expensive connectors such as cannon connectors, and stable connections can be made using ordinary receptacles and connectors for electronic devices.

In addition, a sealant 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 placed on the protective case (619).
Water resistance can also be increased by covering the entire body 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 blue are independently connected to the NOR circuit (621R), (621G), and (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 output as active low, and therefore, in normal operation, all inputs of the NOR circuit (621) are low and 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 the screen is monitored at a monitoring station located far away and an abnormality is found in some units, the screen will be erased and the width of each unit will be Forms and displays a cursor video signal. Due to this, the light emitting element (620R
) ~ (620B), follow the lit units in the horizontal direction, and find the light emitting elements (620R) of the upper and lower units ~
If a unit with (620B) lit 1 is found, it becomes the intersection of the cursor □, that is, the unit where the abnormality was discovered.

In addition, in the unit case (600) shown in FIG. 20, there are 622
) 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.

Also, the displays a, b, and c on the display surface are mirror surfaces (823).
The discontinuity in display in the vertical direction is eliminated by forming virtual images a', b', and c'.

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.
etc., and a passage (704) for workers 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 the rear side is almost sealed off from the floor, ceiling, and back side by the wall (705). I can do it.

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.

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

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.

1 Application Example The present invention can achieve similar effects in traffic lights and the like by making the lower surface of the eaves a mirror surface.

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, (62G) 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. Same as Hide Matsukuma Kansei layer i, - Purity of the drawing? J (No change in content) Figure 1 Figure 2 Figure 3 Figure 5 Figure 7 Figure 8 Figure 6 Figure 8 Figure 22 Figure 25 Figure 26 Figure 270 1523 Procedure amendment 1. Indication of the case Patent Application No. 82257 of 1982 2 Title of the invention Indication device 3, person making the amendment Relationship to the case Patent applicant address 6-7-35 Tokyo Parts for Bad Omens Name (21
8) Norio Ohga, Representative Director of Sony Corporation (1) Supplement the engraving of the drawings as shown in the attached sheet (no changes to the content). ↓楕('j”) a i

Claims (1)

[Claims] A display device characterized in that black upper eaves are provided above a plurality of display devices arranged one above the other, and the lower surfaces of the eaves are mirror-finished.