JPH0536791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large-sized image display device that displays images using a large number of display lamps arranged in a matrix.

[Prior Art] Conventionally, as shown in FIGS. 14 and 15, this type of large-sized image display device includes a multicolor display lamp 1 whose display surface 1a is square, and a display lamp 1 of a housing 2. A large number of display lamps are arranged in a matrix on the front surface to form a large display surface, and the color and amount of light emitted from each indicator lamp 1 is controlled by an indicator lamp drive circuit (not shown) housed in the housing 2. ,
Still images such as advertising images and computer graphics images are now displayed, as well as captions such as lightning news. Note that it is also possible to display a video recorded on a videotape or a moving image such as a video shot with a television camera.
In addition, the display lamps 1 arranged in a matrix
As shown in FIG. 16, the lamps are inserted into the lamp hole 31 of the support body 30 provided on the front surface of the housing 2 through the packing 32, and are arranged at the same pitch vertically and horizontally. It is designed to be attached to a lamp socket 34 provided on a printed circuit board 33 on which a lamp drive circuit is mounted.

Incidentally, such large image display devices are often installed outdoors, and use high-intensity display lamps 1 to display high-contrast images even in bright surroundings. The power consumption of the lamp drive circuit increases and heat generation becomes a problem. Therefore, in the conventional example,
A blower fan is provided at the rear of the housing 2, and heat is radiated from the display lamp 1 and the display lamp drive circuit by blowing air from the blower fan.

Furthermore, in order to efficiently dissipate heat from the display lamps 1, as shown in FIG. 15, a minute gap 5 is provided between each display lamp 1 arranged in a matrix.
As shown in FIG. 16, between the lamp body 10 of the indicator lamp 1 and the lamp holder 11, there is an air intake port 12 at the rear and an exhaust port opening into a small gap 5 at the lower front surface of the lamp holder 11. ventilation passage 14 having 13;
The display lamp 1 was forced to be cooled by air. That is, the lamp body 1 of the indicator lamp 1
0 is formed by a fluorescent lamp having four independent square light emitting parts, as shown in FIG.
The display surface 1a of each light emitting section is covered with an R, G, B filter to enable multicolor light emission, and as shown in FIGS. 16 and 17, the base (filament section) of the lamp body 10 is A cylindrical lamp holder 11 is provided to surround the lamp holder 11, and the electrode lead wire 1 of the indicator lamp 1 is provided at the periphery of the rear opening of the lamp holder 11.
An electrode pin 15 to which 5a is connected is provided protrudingly to form a base portion. Further, the rear opening of the lamp holder 11 serves as an intake port 12 , and the exhaust port 13 is provided on the front lower surface of the circumferential surface of the lamp holder 10 , and an exhaust port 13 is provided between the lamp holder 11 and the lamp body 10 . A ventilation passage 14 is formed. Therefore, the ventilation by the ventilation fan is limited to the ventilation path 1 of each indicator lamp 1.
4 and the display lamps 1, the heat dissipates uniformly from each display lamp 1, prevents variations in the luminous efficiency of the display lamps 1 due to temperature changes, and produces high-quality color images. It is now possible to display.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, when the wind and rain become strong, the rainwater that blows in from the minute gap 5 formed between each indicator lamp 1 is caused by the strong wind. It is blown up and enters the housing 2 through the exhaust port 13 opened on the front lower surface of the lamp holder 11 of the indicator lamp 1, causing insulation deterioration of electric circuits such as the indicator lamp drive circuit and the power supply circuit. There was a problem that it caused malfunctions such as short circuits. On the other hand, when placed outdoors, even if the brightness of the display lamp 1 is increased, sunlight is reflected on the display surface 1a of the display lamp 1, resulting in a problem that the contrast of the displayed image is reduced.

The present invention has been made in view of the above points, and its purpose is to improve each display by utilizing the base of the shade that prevents the contrast from decreasing due to sunlight being reflected on the display surface. It is possible to prevent rainwater from entering through the exhaust gap formed between the lamps and the exhaust port formed on the front lower surface of the indicator lamp, and the structure is simple and easy to assemble, reducing costs. The object of the present invention is to provide a large-sized image display device that is possible.

[Means for Solving the Problems] The large-sized image display device of the present invention has a large number of display lamps each having a rectangular display surface arranged in a matrix on the front surface of a housing, with small gaps between them. A ventilation fan is provided at the rear of the housing to cool the lamp drive circuit and indicator lamp.
In a large image display device that has a ventilation passage formed between the lamp body of the indicator lamp and the lamp holder, and an exhaust port that opens with a minute gap on the lower front surface of the lamp holder, The base of a shade provided to prevent sunlight from being reflected on the display surface is inserted into a small gap in the vertical direction between display lamps, and the base of the shade is opposed to the exhaust port at an appropriate distance. It is.

[Function] The present invention is configured as described above, and since a shade is provided corresponding to each indicator lamp to prevent sunlight from being reflected on the display surface, the present invention can be installed outdoors. Furthermore, by placing the base of the shade inserted into the small vertical gap between the display lamps and facing the exhaust port at an appropriate distance, it is possible to obtain a display image with high contrast. Using
Prevents rainwater from entering through the exhaust gap formed between each indicator lamp and the exhaust port formed on the front lower surface of the indicator lamp, making it simple to configure and easy to assemble, reducing costs. It was designed so that

[Embodiment] FIGS. 1 to 4 show an embodiment of the present invention, in which a large number of display lamps 1 each having a rectangular display surface 1a are arranged in a matrix on the front surface of a housing 2 with minute gaps 5. A blower fan for cooling the display lamp drive circuit and the display lamp 1 housed in the housing 2 is provided at the rear of the housing 2, and an air intake port is provided at the rear between the lamp body 10 and the lamp holder 11 of the display lamp 1. 12 and a ventilation passage 14 having an exhaust port 13 in a minute gap 5 on the lower front surface of the lamp holder 11. A shade 7 is attached to each indicator lamp 1, and a waterproof plate is inserted at the base of the shade 7 into the minute gap 5 in the vertical direction between the indicator lamps 1 and faces the exhaust port 13 at an appropriate distance. A portion 8 is provided. Here, in the example, shade 7
is formed by punching out a thin stainless steel plate into a predetermined shape, bending the upper light shielding part 7a, and cutting and raising the lower light shielding part 7b and applying black baking paint. In addition, the shade 7 is attached by adhering and fixing the attachment piece 16 to the side surface of the light emitting part of the lamp body 10 with a silicone adhesive, and the attachment piece 16 has a protrusion 17 formed thereon for temporary fixing. By adhering the attachment piece 17 while the shade 7 is elastically engaged and attached to the indicator lamp 1, the adhesion and fixing work can be easily performed. Note that the other configurations are the same as those of the conventional example.

The operation of the embodiment will be described below. now,
A shade 7 is provided corresponding to each display lamp 1 to prevent sunlight from being reflected on the display surface 1a, so that a high contrast display image can be obtained even when installed outdoors. It's getting old. In the example, the shielding angle θ is set to 45°,
It is possible to completely prevent the reflection of sunlight with an incident angle of 45° or more, and to prevent a decrease in contrast due to sunlight being reflected on the display surface 1a. Furthermore, since the shade 7 is attached to each display lamp 1 to form a shaded display lamp, the arrangement pitch and number of display lamps 1 can be freely designed, increasing the degree of freedom in design.

Furthermore, by arranging the waterproof plate part 8 provided at the base of the shade 7 inserted into the minute gap 5 in the vertical direction between the display lamps 1 to face the exhaust port 13 with an appropriate interval, the shade 7 for contrast improvement can be improved.
The base of the indicator lamp 1 is used to prevent rainwater from entering through the small exhaust gap 5 formed between each indicator lamp 1 and the exhaust port 13 formed on the front lower surface of the indicator lamp 1. There is no need to provide a waterproof mechanism, the structure is simple, assembly is easy, and costs can be reduced.

FIG. 5 shows another embodiment, in which the waterproof plate part 8 of the shade 7 is attached to the lower indicator lamp 1.
are disposed at appropriate intervals at the exhaust port 13 of the upper indicator lamp 1 to obtain the same waterproof function as in the previous embodiment.

FIGS. 6 and 7 show still another embodiment, in which reinforcing ribs 19a and 19b are provided on the side edges 18 of the cut and raised portions of the waterproof plate portion 7 and the light shielding portion 7b.
is provided so that sufficient mechanical strength can be obtained even when the shade 7 is formed of a thin plate, and deformation does not occur when the shade 7 is attached to the display lamp 1.

8 to 12 show still another embodiment, in which 8×2 indicator lamps 1 are attached to the front of the module case 20.
A printed circuit board 21 for wiring the display lamps 1 is arranged inside the display module 3 to form a display module 3 in which a plurality of display lamps 1 are integrated. The module case 20 is divided into three parts, with the front part divided into three parts in the vertical direction and the rear part divided into two parts, and is formed by attaching an upper cover 20b and a lower cover 20c to the upper and lower parts of the central case body 20a. The periphery of the lamp hole 23 formed in the front plate 22 of the module case 20 is fitted into the fitting groove 24 formed on the circumferential surface of the cylindrical portion of the lamp holder 11 of the indicator lamp 1 to make it watertight. forming a structure. In addition, in the embodiment, a waterproof wall 25 parallel to the front plate 22 is provided in the module case 20.
is provided, and the peripheral edge of the lamp hole 26 bored in the waterproof wall 25 is fitted into a second fitting groove 27 formed on the circumferential surface of the cylindrical portion of the lamp holder 11. A watertight structure is formed to create a more reliable waterproof mechanism. In addition, the front plate 22 and the waterproof wall 2
Needless to say, the case body 20a and the upper and lower covers 20b and 20c are divided into three parts. In addition, in the embodiment, as shown in FIG. 13, a plurality of (2×4) display modules 3
are integrated to form a display unit 4, and the display units 4 are arranged in a matrix on the front of the housing 2 to form a large display surface. A blower fan 42 for forced air cooling of the circuit and indicator lamp 1 is provided.

[Effects of the Invention] The present invention is configured as described above, and since a shade is provided corresponding to each display lamp to prevent sunlight from irradiating the display surface, it is easy to use when installed outdoors. It is possible to obtain a display image with high contrast even when displaying images, and by arranging the base of the shade inserted into the small vertical gap between the display lamps to face the exhaust port at an appropriate distance, the shade can be used to improve contrast. Using the base of
It prevents rainwater from entering through the exhaust gap formed between each indicator lamp and the exhaust port formed on the front lower surface of the indicator lamp, making the configuration simple and easy to assemble, reducing costs. This has the effect of making it possible.

[Brief explanation of drawings]

FIG. 1 is a side view of the main parts of an embodiment of the present invention, FIG. 2 is a perspective view of the main parts of the same, FIG. 3 is an exploded perspective view of the main parts of the same, and FIG. 4a is a sectional view of the main parts of the same. Fig. 4b is a front view of the main parts of the same as above, Fig. 5 is a side view of the main parts of another embodiment, Fig. 6 is a perspective view of the main parts of another embodiment, and Figs. 7a and b are the main parts of the same as above. 8 is a side view of the main part of another embodiment, FIG. 9 is a front view of the main part of the same as above, FIG. 10 is a sectional view of the main part of the same as above, and FIG. 11 is a perspective view of main part of same as above. Figure 12 is a bottom view of the same main points as above,
Fig. 13 is a perspective view of the main part of the same as above, Fig. 14 is a perspective view of the conventional example, Fig. 15a is a sectional view of the main part of the same as above,
FIG. 5b is a front view of the main part of the same as above, FIG. 16 is a sectional view of the main part of the same as above, and FIGS. 17 and 18 are perspective views of the main part of same as above. 1 is an indicator lamp, 2 is a housing, 5 is a minute gap, 7 is a shade, 8 is a waterproof plate part, 10 is a lamp body, 11 is a lamp holder, 12 is an intake port, 13
is an exhaust port, and 14 is a ventilation path.

Claims (1)

[Claims] 1. A large number of indicator lamps with square display surfaces are arranged in a matrix on the front side of the housing with small gaps between them, and an indicator lamp drive circuit housed in the housing and a blower fan for cooling the indicator lamps are installed in the rear of the housing. , a large image display device comprising a ventilation passage provided between a lamp body of a display lamp and a lamp holder, having an intake port at the rear and an exhaust port in a small gap at the front lower surface of the lamp holder, A shade that prevents sunlight from being reflected on the display surface is attached to each display lamp, and the shade is inserted into the small vertical gap between the display lamps at the base of the shade and faces the exhaust port at an appropriate distance. A large image display device characterized by having a waterproof plate section.