JPS61132986A - Large video 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] [Industrial Application Field] The present invention relates to a large-sized video display device, and in particular, the present invention relates to a large-sized video display device, and in particular, the display screen is divided into a plurality of small sections, and each small section is maintained, inspected, and
The present invention relates to a large-sized video display device that is formed to a size that allows for repair work and the like.

[Conventional technology]

2. Description of the Related Art In recent years, various large-sized video display devices have been proposed that allow a large number of people to view the same screen at the same time at competition facilities, expos, exhibitions, and the like.

An example of such a large-sized video display device was previously proposed by the applicant in Japanese Patent Application No. 82258/1983. The display device for the future face has an extremely large screen measuring 25 m in height x 40 m in width, and uses approximately 150,000 cells of fluorescent display elements that integrate the three primary color pixels of R and QB (red, green, and blue) to create a two-dimensional ( For example, the bait picture element number is approximately 450,000 pixels, and the suitable viewing distance is 50
~soom, the brightness is over 1500ft-L at the white peak, and the average total power consumption is about 800KW.

When performing maintenance, inspection, and repair work on such extremely large display devices, the display screen is divided into multiple small sections, i.e.
The idea is to divide the area into small sections large enough to ensure enough space for Iruma to come in and out, and to perform maintenance and inspection work on each section.

On the other hand, because of the need to uniformly control the display drive of the entire screen, the power supply to each of the small sections is also centrally controlled, for example, in a central control room.

Therefore, when a worker goes to the small section to carry out maintenance, inspection, etc., it is necessary to cut off and control the power supply to the corresponding small section in the central control room or the like for safety.

[Problems to be Solved by the Invention] [By the way, the above-mentioned fluorescent display elements, which serve as picture elements on the screen of a display device, are supplied with a high voltage of, for example, about 10 mm for electron beam control. . Since such high voltages are extremely dangerous to workers, it is important to at least cut off the high voltage supply while workers are present in the small area.

However, if power supply control is performed only by the central control room, it is conceivable that due to a communication error or an operation error, high voltage will be supplied to the small section where the worker is working. In particular, as the overall display device becomes larger, the maximum distance between the central control room, etc. and the above-mentioned small sections increases, and it becomes difficult to confirm the presence or absence of workers in each small section when controlling the power supply. becomes difficult.

In view of the above-mentioned circumstances, the present invention provides maintenance, inspection, and
The purpose of the present invention is to provide a large-sized video display device that allows repairs and other work to be carried out safely.

[Means for solving problems]

That is, the large-sized video display device of the present invention is configured such that the display screen is divided into a plurality of small sections, power is supplied to each of the small sections, and at least the high voltage supply is cut off for each of the small sections. It is characterized by being equipped with a safety switch.

[Effect]

Therefore, the worker himself can control the high voltage supply to the small section at his current location, and at least cut off the high voltage supply to each small section independently without relying on centralized control from a central control room or the like. Maintenance, inspection, repair work, etc. can be performed safely.

〔Example〕

FIG. 1 schematically shows a part of an embodiment of the present invention. It is a broken schematic plan view.

In FIG. 1, a display screen 3 of a large-sized video display device is composed of a large number of fluorescent display elements 1 arranged two-dimensionally in the horizontal direction (direction of arrow X) and the vertical direction (direction of arrow Y). ing. These fluorescent display elements 1 are, for example, display cells that integrally have a blue fluorescent display segment, a red fluorescent display segment, and a green fluorescent display segment, as described later.

Next, this display screen 3 is divided into a plurality of small sections 5 large enough to ensure a space for a person to enter and exit, and a power supply device 6 having a booster circuit or the like is provided for each small section 5. ,
For example, a commercial AC power of 200 V is supplied to these power supply devices 6 via a power supply line 7. Further, each power supply device 6 is connected to a safety switch 8 for cutting off the high voltage supply from the power supply device 6. This safety switch 8 is provided near the entrance/exit 4 of the small compartment 5t.

Next, FIG. 2 shows a power supply device 6 provided in each small section 5.
As shown in the block circuit diagram with the safety switch 8 removed, a high voltage output circuit 61 is provided within the power supply device 6. This high-voltage output circuit 61 receives, for example, 200V commercial AC supplied from the commercial AC power supply line 7 via the small section branch wiring 62 and the switch 63.
The voltage is boosted using a step-up transformer, a multiplier rectifier circuit, etc., rectified and smoothed, and converted into a DC voltage of, for example, about 10 KV, which is output to the high-voltage output terminal 64. The high voltage output from this output terminal 64 is sent to an anode lead terminal of a fluorescent display element, etc., which will be described later. Further, the switch 63 is a relay, a semiconductor switching element, etc. that is controlled to be turned ON or OFF according to the signal from the safety switch 8, and when the switch 63 is turned OFF'l;'', the branch wiring 62
Since the commercial alternating current from the high voltage output circuit 61 is no longer supplied to the high voltage output circuit 61 and the high voltage output from the output terminal 64 is no longer obtained, the high voltage supply is cut off. In addition, power supply device 6
There is a low voltage (approx. 5cm DC) inside the control circuit, etc.
A low voltage output circuit 65 and the like are provided for supplying power to the low voltage output circuit 65, and the power from the wiring 62 is directly supplied to the low voltage output circuit 65 (without using a switch). Therefore, even if the safety switch 8 is operated to cut off the high voltage supply, the low voltage power supply remains alive, making it easy to check the operation of the circuit. Note that the low voltage output from the low voltage output circuit 65 is taken out via the output terminal 66.

By the way, one terminal of the safety switch 8 is connected to the power supply device 6, but the other terminal 68 may be connected to a remote control switch 9 in, for example, a central control room. In this case, the safety switch 8 is always in the ON state, and the remote control switch 9 in the central control room etc. is turned on and off.
``The switch 6 in the power supply device 6 responds to the FF operation.
3 is ON.

However, if the worker goes to the small section and turns off the safety switch 8, the switch 63 in the power supply device 6 will be turned off regardless of the 0N1OFF state of the remote control switch 9, and the high voltage will be turned off. Supply is cut off. In this case, since the safety switch 8 is provided near the entrance/exit 4, it can be turned off when the worker enters the small section 5.

Next, the above-mentioned embodiment of the present invention was disclosed in the patent application filed in 1983 by the applicant.
A specific example applied to the display device previously proposed in Japanese Patent Application No.-82258 will be described with reference to the drawings.

3 to 5 show the fluorescent display element 1 used to construct the display screen, FIG. 3 is a plan view, and FIG. 4 is a plan view.
The figure is a sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a partially broken perspective view.

In these FIGS. 3 to 5, the glass tube body 11 serving as the fluorescent tube housing has a front panel 11A and a back plate 11B.
and a side plate 11C, and a plurality of fluorescent display segments 2 (2B, 2R, 2R,
2G), a plurality of candos K (Kn, KR, KG) and a first grid (control electrode) Gl (GIB, G, R, G1.) corresponding to each display segment;
A common second grid (acceleration electrode) G2 is arranged. The fluorescent display segment 2 is formed by coating a fluorescent layer on the inner surface of the front panel 11A, and in this case, there are three fluorescent display segments 2ES, 2R for blue light, red light, and green light.

2G has been formed. Specifically, as shown in FIG. 6, a carbon layer 13, which is a conductive layer, is printed in a frame shape on the inner surface of the front panel 11A, and a carbon layer 13, which is a conductive layer, is printed in a frame shape on the inner surface of the front panel 11A. The phosphor layer 2B, the red phosphor layer 2R, and the green phosphor layer 2G are formed by printing, partially spanning over the carbon layer 13. A metal back layer 15 of aluminum is deposited. Wire cathodes KB, K are placed inside the back panel IIB, respectively, facing the display segments 2B, 2B, 2G formed by each phosphor layer.
First grids GtB, GIR, olc are arranged opposite to R, KG and their respective wire cathodes KB, KR1KG, and three first grids GI B, Cx1R are arranged.
, GlG Lf - a second grid G2 is arranged in common. Each wire cathode is formed, for example, by coating the surface of a tungsten heater with carbonate, which serves as an electron-emitting substance.

Each wire cathode KB, KFL, KG is connected to a pair of conductive supports 16, 17 respectively disposed on both sides of the back panel 11B.
The bridge will be erected. One support part 16 is for fixing one end of the wire cathode, and the other support part 7 is provided with a spring part 17a, and the other end of each wire cathode is fixed to this spring part 17a. As a result, even if the wire cathode stretches due to a rise in temperature, the stretch is absorbed by the spring portion 17a, and the wire cathode does not loosen. Each first grid 01B, G, , G
The tG is formed into a semicylindrical shape with a cylindrical surface facing each wire cathode, and a large number of slits 18 are provided on the cylindrical surface at a predetermined pitch in the longitudinal direction. This slit 18 is a hole through which electrons emitted from the wire cathode K pass. The second grid G2 is constructed by forming slits 19 at the same positions as the slits 18 of the first grid in portions corresponding to the first grids 01B and 0IR201G. In this case, the slit portions $9B, 19B, 19G of the second grid G2 can be configured to have cylindrical surfaces concentric with the corresponding first grids etB, GLFL, G, G, respectively. In this case, the electron beam from the wire cathode is transmitted to the first grid and the second grid.
It radiates linearly through the slits 18, 19t of the grid and is widened with respect to the longitudinal direction of the slits.

On the other hand, a separator 10 made of a conductive material is arranged to surround each of the fluorescent display segments 2B, 2R, and 2G. This separator 10 allows the electron beam from the cando to
Alternatively, a shield is provided to prevent the secondary electrons hitting the second grid G and G2 from emitting light to adjacent fluorescent display segments, and a corresponding fluorescent light is provided for the electron beams from each wire cand K. It serves to spread the electron beam so that it is irradiated to the entire second optical display segment, so-called a diffusion 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. .

When assembling the cono-cehalator 10, the inside of the glass tube 10
It is supported between the front panel I and the side plate IC and fixed by seven holes. Furthermore, anode leads 12 for supplying high voltage (anode voltage) are led out from the separator 10 to supply high voltage (anode voltage) to both opposing sides of one of the upper ends.

Next, when constructing a large-sized image display device using the above-mentioned fluorescent display element, the procedure is as follows.

That is, a plurality of fluorescent display elements 1 as described above are arranged in a unit case, for example, 6 x 4 = 24 as shown in the diagram.
A single unit 1-20 is constructed by incorporating these units.

Furthermore, as shown in FIG. 8, a block 21 is constructed by combining, for example, 7 vertical x 5 = 35 units 2°, and 5 blocks 21 are arranged horizontally to form the small section 5.
A sub-module 22 corresponding to the above is constructed, and 36 sub-modules 22 (9 vertically x 4 horizontally) are combined. As a result, a display section 23 of a large display device having a display screen of, for example, 25 m in height x 40 m in width is configured. The total number of elements in this case is 36X5X35X24=151,200. Furthermore, the number of pixels is approximately 450,000, which is three times this number.

Here, FIG. 8 shows a front view of the entire device, and FIG. 9 shows a sectional view thereof. For example, this whole thing has a height of 42 m and a width of 47 m.
The upper part of this building is a display section 23, and nine floors each having a height of 2.63!3rn are provided in this part. 2 submodules on each floor
2 are provided in four rows each. Furthermore, a stage 26 for special events, a waiting room 27, and a central control room 28 for displaying and operating the stage are provided in the lower part.

Furthermore, as described above, this device is formed of submodules 22 corresponding to the subdivisions 5, and is assembled by attaching them to a building. In this case, each submodule 22 is constructed as shown in FIG. A space of a predetermined width is provided on the back side, in which the power supply device 6 having the above-mentioned high voltage output circuit 61 and the like are provided, and a passage 34 for the worker is secured.

Furthermore, inside the sub-module 22, a safety switch 8 is provided near the entrance/exit of the passage 34 for cutting off the high-voltage power supply from the high-voltage output circuit of the power supply device 6.

Furthermore, this sub-module 22 has the unit 20 attached to the pillar 32 on the front side, so that each unit 200
A gap is provided between them, and the rear side is connected to the floor, ceiling,
The back surface is substantially sealed by a wall 35. Therefore, an opening is provided in a predetermined part of the wall 35 on the back side, and 77 inches 36
Install. By driving this 7A 736 to allow air to flow in, the internal pressure inside the submodule 22 surrounded by the wall 35 increases, and this increased pressure air blows out from the gaps between the units 20. It turns out.

Here, regarding the internal structure of the power supply device 6 and the connection relationship with the safety switch 8, it is energized as described in FIG. In addition to this, keeping the low voltage power supply in the supplied state makes it easier to check the operation of the circuit.

In addition, the high voltage supply can be reliably cut off regardless of remote control in the central control room, etc. For example, even when you want to check the high voltage energization, the small section 5 (sub module 22), it is possible to efficiently check the high voltage energization while ensuring the safety of the workers.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the safety switch may be provided with a display means such as an ON or OF2 indicator lamp to draw the attention of the operator.

〔Effect of the invention〕

According to the large-sized video display device of the present invention, since the high voltage supply can be forcibly cut off for each small section, the high voltage of the small section that the worker is currently working on is independent of remote control from a central control room, etc. Not only can the voltage supply be cut off to ensure work safety, but also high voltage energization checks can be carried out efficiently while ensuring the safety of workers.

Further, by cutting off only the high voltage supply to the small section and keeping the low voltage energized, circuit operation checks can be performed without posing danger to workers, improving work efficiency.

Furthermore, by providing a safety switch on the entrance/exit side of each small section, the high voltage supply to the small section that the worker is about to enter can be cut off in advance, further increasing safety.

In addition, when reaching the desired compartment through multiple consecutive compartments, cut off all high voltage supplies to the compartments you passed through, and when returning, turn on the safety switch in the order from the compartment you left. If it is in the high voltage OT function state, then = Yes.

[Brief explanation of the drawing]

Figures 1 and 2 are for explaining the basic concept of an embodiment of the present invention.69 Figure 1 is a schematic plan view showing a partially cut away display screen, and Figure 2 is a schematic plan view showing a partially cut away display screen. Block circuit diagram showing the power supply and safety switch in Figure 1, Figure 3
The figures and figures show a more specific configuration of the above embodiment, and FIG. 3 is a plan view of the fluorescent display element, FIG. 4 is a sectional view taken along the It/-IV line in FIG. 3, and FIG. Fig. 5 is a partially cutaway perspective view of the device shown in Fig. 3, Fig. 6 is an enlarged cross-sectional view of the main part near the fluorescent display surface, and Fig. 7 shows a unit incorporating a plurality of fluorescent display elements. FIG. 8 is a front view of the entire collective video display device, FIG. 9 is a side view thereof, and FIG. 10 is a schematic sectional view of a submodule corresponding to a small section. 1... Fluorescent display element 3...Display screen 4...Entrance/exit 5...Small section

Claims (1)

[Claims] A large video display device comprising a display screen divided into a plurality of small sections, configured to supply power to each small section, and provided with a safety switch for at least cutting off the high voltage supply for each of the small sections. .