JP3536539B2 - Screen display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a technique for taking measures against contamination on the surface of a light emitting element constituting a screen display device.

[0002]

2. Description of the Related Art In a baseball field or a gymnasium, there is a so-called screen display device (hereinafter also referred to as a large screen display device or a large screen display) for showing image information to spectators. Since this type of large screen display is used outdoors or indoors with strong illumination, it is strongly affected by external light and causes a decrease in contrast and the like. Various measures have been devised to prevent such influence of external light and obtain clear image quality.

There are various types of such screen display devices, and the object of the present invention is to use a CRT type light emitting element as a light emitting element. The same applies to a certain light emitting element. 6 to 9 show a part of the structure of a conventional screen display device,
The problem will be described. FIG. 6 shows Japanese Patent Application Laid-Open No. 61-2553.
It is a side view which shows the whole screen display apparatus shown by the 85 publication.

FIGS. 7 and 8 show FIG. 6 for convenience of the following description.
Are shown in a simplified manner. In the figure, reference numeral 20 denotes a part of the screen display device, and reference numeral 2 denotes a CRT light-emitting device (hereinafter simply referred to as a light-emitting device) in which a plurality of phosphors 3 are arranged in a matrix. 1 is a shedder (also called eaves). FIG. 9 is an enlarged view for explaining the light emitting element 2.

The light-emitting element 2 has R, G,
The three types of phosphors B (also referred to as pixels) 3 of B are regularly applied, and a high voltage (10 Kv) is applied to each phosphor 3 to emit light. The shedder 1 is arranged in large numbers on the upper and lower portions of the front surface of the light emitting element 2 of the large screen display 20 used outdoors, and the black shedder 1 is provided above and below each pixel 3 so as to block external light 21. Have been. The intervals between the shedders 1 are P1 and P2 in FIGS.
As shown in the figure, the distance corresponds to the interval between the pixels 3 of the light emitting element 2, and the color display can be visually recognized from between the shaders 1.

1A is a front panel of the light emitting element 2, 605 is a protective film, 11 is a transparent conductive film provided between the protective film 605 and the front panel 1A on the front of the light emitting element 2, and 623 is a lower surface of the shedder 1. This is a stainless steel end plate attached to. Transparent conductive film 11 and stainless steel end plate 623
Are grounded. Thereby, the light emitting element 2
(The front portion is the space and the front panel 1A portion) is charged by the applied high voltage, and the property of adsorbing insects and dust is alleviated.

However, the structure shown in FIG. 6 has the following problem. That is, since the end plate 623 made of stainless steel is a metal plate, it is heavy, and it takes time to attach it to the shedder 1. In addition, since the transparent conductive film 11 is extremely thin, it must be used between the front panel 1A and the protective film 605, and there is a problem that the entire structure becomes complicated.

Meanwhile, a technique that does not use the stainless steel end plate 623 or the transparent conductive film 11 is disclosed in Japanese Utility Model Laid-Open No. 2-854.
No. 76 is disclosed. This is a technique for preventing the generation of static electricity by attaching a conductive tape (not shown) to the side surface of the light emitting element 2 and pulling it out backward with a lead wire or the like and grounding. It is the one that has. In this case, when the light emitting element 2 is replaced, it is necessary to treat the conductive tape on the side surface, which causes a problem that the replacement operation is not easy.

Since the surfaces of the light emitting elements 2 are in contact with air as described above, dust and insects in the air are attracted when the light emitting elements 2 are charged with static electricity.
It adheres to the surface of the light emitting element 2 and causes a decrease in luminance. Even if a conductive tape is attached to the side surface of the light emitting element 2 in order to prevent the surface from being stained, the effect of preventing static electricity charged on the surface side of the light emitting element 2 is small, and the effect of the stain prevention measure is small. small.

[0010]

As described above, the conventional large-screen display has a large number of shedders for blocking external light and preventing a decrease in contrast. Further, the potential of static electricity charged around the light emitting element is high, and the surface of the light emitting element is charged with several kv of static electricity at the same level as the potential of the anode. The static electricity attracts dust in the air, adheres to each pixel between the shedders, and causes contamination of the light emitting element surface.

In order to prevent this, as described above, a grounded metal plate is attached to the above-mentioned shedder, a grounded transparent conductive film is sandwiched and provided on the front surface of the light emitting element, or a side surface of the light emitting element is provided. There is disclosed a method of attaching a conductive tape to such a method, but all of these methods have problems such as a large weight and time, a complicated structure, and a small effect.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an antistatic structure which has a simple structure, requires little labor, and has a high effect.

[0013]

The large-screen display according to the present invention uses a conductive plastic as the material of the shedder itself, and the shedder is grounded by contacting the housing.
The back surface of the shedder contacts the periphery of the front surface of the light emitting element .

Further, a conductive tape is attached to the back surface of the lattice of the shedder in contact with the surface of the light emitting element, and the conductive tape is grounded.

Further, a conductive paste is used in place of the conductive tape.

Further, a transparent conductive film is provided on the surface of the light emitting element, a conductive projection is provided on a portion of the conductive film which is in contact with the shedder, and the conductive film is grounded via the shedder.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is an exploded perspective view of a screen display device according to the present invention. Reference numeral 6 denotes a conductive plastic shedder which comes into contact with the surface of the light emitting element 2 constituting the large screen display, and is made of conductive plastic. The material of the conductive plastic shedder 6 is a material in which fine particles of a conductive metal such as silver, copper, or carbon are mixed in a resin. The conductive plastic shedder 6 is grounded (the outer frame 9 around the light-emitting element 2 is grounded and is in contact therewith), and the surface of the light-emitting element 2 is brought into contact with the conductive plastic shedder 6 to make the light-emitting element The static electricity charged on the surface of the light emitting element 2 can be reduced, and the surface of the light emitting element 2 can be prevented from being stained by the influence of the static electricity. In addition, the workability of producing the conductive plastic shedder 6 is good, and there is no fear of uneven coating or peeling.

Embodiment 2 FIG. FIGS. 2 and 3 show the configuration of the shedder 1 of the screen display device according to the second invention. The shedder 1 in contact with the surface of the light emitting element 2 constituting the large screen display is made of insulating plastic, and a conductive tape 4 is attached to the grid-like portion on the back surface of the shedder 1 and grounded. Then, by bringing the back surface of the shedder 1 into contact with the surface of the light emitting element 2, the static electricity charged on the surface of the light emitting element 2 can be reduced. As a result, dirt attached to the surface of the light emitting element 2 due to the influence of static electricity can be reduced.

According to the present invention, in order to prevent dirt adhering to the surface of the light emitting element 2, a conductive tape 4 is attached to a grid-like portion on the back surface of the shedder 1 which is in contact with the entire periphery of the surface of the light emitting element 2, Grounded. Thereby, many light emitting elements 2 can be grounded at once. Since the conductive tape 4 has some adhesiveness, after the light emitting element 2 is mounted, it is fixed between the back surface of the shedder 1 and the front surface of the light emitting element 2 and is extremely easy to assemble.

Embodiment 3 FIG. 4 shows a configuration diagram of the back surface of the shedder 1 using the conductive paste 5. A conductive paste 5 is applied to a grid-like portion on the back surface of the shedder 1 which is in contact with the surface of the light emitting element 2 constituting the large screen display, and this is grounded. As a material of the conductive paste, for example, a paste obtained by uniformly mixing a metal powder such as silver having excellent conductivity with a synthetic resin and the like is used. Unlike the conductive tape 4, the conductive paste 5 has an effect of not being peeled off.

The countermeasure against the contamination of the surface of the light emitting element 2 using the conductive paste 5 is that the conductive paste 5 can be applied to all the grid-like portions of the shedder 1 which is in contact with the surface of the light emitting element 2. When 2 comes into contact with shedder 1,
The periphery of the surface of the light emitting element 2 can be grounded. Thereby, static electricity charged on the surface of the light emitting element 2 can be reduced, which is very effective as a measure against contamination.

It is to be noted that a black conductive paste may be applied to the whole of the shedder 1 including the lattice-shaped back surface portion of the shedder 1 which is in contact with the surface of the light emitting element 2, and the shedder 1 may be grounded.
As a material of the black conductive paste, for example, a material obtained by mixing black carbon or the like is used. As a result, static electricity charged on the surface of the light emitting element 2 can be reduced, and dirt on the surface of the light emitting element 2 attached due to the influence of the static electricity can be reduced. In addition, the use of the black conductive paste has an effect of blocking external light and improving contrast. In addition, in order to apply the black conductive paste to the entire shedder 1, the coating process is simplified, for example, by putting the entire shedder 1 in a container containing the conductive paste 5.

Embodiment 4 FIG. 5 shows a configuration diagram of the light emitting element 2 using the transparent conductive film 7 of the fourth embodiment. That is, a transparent conductive film 7 is provided on the surface of the light emitting element 2 constituting the large screen display, and the shedder 1 of the conductive film 7 is provided.
The conductive protrusions 8 are provided at the P1 interval portions in FIG. 5 (the same as the shedder interval portions in FIG. 8P1), and the conductive film 7 is grounded via the shedder 1. The conductive protrusion 8 is provided so as to surround the periphery of each pixel 3 of the light emitting element 2.

Since the shedder 1 itself is grounded by the method described in the first to third embodiments, it is grounded by bringing the conductive protrusion 8 into contact with the shedder 1. By using the transparent conductive film 7, static electricity on the entire front surface of the light emitting element 2 can be reduced without lowering the brightness of the light emitting element 2, and dirt on the surface of the light emitting element 2 adhered by the influence of the static electricity can be reduced. Can be. The conductive projections 8 are formed on the surface on which the transparent conductive film 7 is formed by applying the conductive paste 5 to the P in FIG.
Provided at one interval using printing technology.

As a result, the shedder 1 and the surface of the light emitting element 2 are easily brought into contact with each other, and the entire front surface of the light emitting element 2 can be reliably grounded, and the periphery of each pixel can be suppressed by the conductive projection 8. Even if the conductive film 7 is not sandwiched by the protective film 605 shown in FIG. 6 or the like, wrinkling does not occur and the structure is simplified.

In particular, since the transparent conductive film 7 is located at the forefront of the light emitting element 2 and is in a state of being in direct contact with the outside air, the effect of preventing the charging of air in front of the light emitting element 2 is particularly achieved. It is excellent. For the conductive protrusions 8, various other conductive materials such as the conductive tape 4 can be used. This method can further enhance the effect by combining with the first to third embodiments.

[0027]

Effects of the Invention in contact with a large screen display of the surface using a conductive plastic material shedder, shedder
To the housing to ground the shedder. And
By contacting the surfaces of the large-screen display to the conductive plastic shedder, and weight of the market shares loaders, it is possible to facilitate assembly, it is possible to reduce the static electricity on the surface, adheres to the light-emitting element surface Dirt can be reduced.

Further, attaching the conductive tape in a lattice-shaped rear surface portion of the insulating plastic market shares loaders, or coating conductive paste in a grid pattern of the back surface portion of the shedder, grounding the painted surface. Accordingly, when the surface of the light emitting element comes into contact with the shedder, static electricity charged on the surface can be reduced, and dirt attached to the surface of the light emitting element can be prevented. Further, the weight of the shedder can be reduced and the assembling of the light emitting element can be facilitated, so that the effect is not reduced.

In addition, by applying a black conductive paste to the entire shedder, static electricity is released, dirt attached to the surface of the light emitting element is prevented, external light is blocked, and contrast is improved. Workability can be improved.

By forming a transparent conductive film on the surface of a large-screen display, providing a conductive protrusion on a portion of the conductive film which is in contact with the shedder, and grounding the conductive film via the shedder, the luminance of the light emitting element is increased. The static electricity charged on the surface of the large-screen display can be reduced, and the dirt attached to the surface of the light-emitting element can be reduced without lowering the image quality. Moreover, the grounding can be reliably performed by the conductive protrusions.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a screen display device according to a first embodiment.

FIG. 2 is a rear view of a shedder of the screen display device according to the second embodiment.

FIG. 3 is a side view of the large screen display of FIG. 2;

FIG. 4 is a rear view of the shedder of the large screen display according to the third embodiment.

FIG. 5 is an exploded view of a large-screen display according to a fourth embodiment.

FIG. 6 is a side view of a conventional screen display device.

FIG. 7 is a front view of FIG. 6;

8 is a side view of a main part of the screen display device of FIG. 6;

FIG. 9 is an enlarged explanatory view of a light emitting element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shedder 1A Front panel 2 Light emitting element 3 Phosphor 4 Conductive tape 5 Conductive paste 6 Conductive plastic shedder 7 Transparent conductive film 8 Conductive protrusion

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-116585 (JP, A) JP-A 1-210987 (JP, A) JP-A 1-224491 (JP, A) JP-A 5- 61422 (JP, A) JP-A-5-165415 (JP, A) JP-A-9-146467 (JP, A) JP-A-61-122684 (JP, A) JP-A-61-255385 (JP, A) JP-A-63-287883 (JP, A) JP-A-64-60159 (JP, A) JP-A-2-53071 (JP, U) JP-A-2-85476 (JP, U) JP-A-5-66673 (JP, U) Japanese Utility Model Showa 61-173944 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G09F 9/00-9/46

Claims (4)

(57) [Claims] 1. A plurality of light emitting elements arranged in vertical and horizontal matrix surface being substantially perpendicular arrangement, said plurality of originating
A screen provided around an optical element and grounded , and a shedder protruding substantially horizontally forward of the light emitting element between light emitting elements arranged above and below among the plurality of light emitting elements; in the display device, the market shares Zehnder is fabricated with a conductive plastic, wherein the sheet
Eda is the grounded by contact with the housing, the screen display device back surface of the shell <br/> Zehnder is characterized a contact to Turkey <br/> around the front of the light emitting element. 2. Instead of the fabricated shedder a conductive plastic, and market shares Zehnder fabricated from an insulating plastic, and a conductive tape attached on the rear surface portion of the shedder in contact with the front surface of the light-emitting element Yes The screen display device according to claim 1, wherein the conductive tape is grounded . 3. The screen display device according to claim 2, wherein a black conductive paste is used in place of the conductive tape. 4. A plurality of light emitting elements arranged in vertical and horizontal matrix surface being substantially perpendicular arrangement, said plurality of originating
A housing provided around an optical element and grounded , and among the plurality of light emitting elements, protrudes substantially horizontally forward of the light emitting element between light emitting elements arranged vertically, and at least a back surface portion a shedder with but electrically conductive, between the market shares <br/> loaders and the light emitting element, the screen display device and a transparent conductive film provided to cover the front surface of the light emitting element, the transparent A screen display device having a projection made of a conductive paste at a portion in front of a conductive film and in contact with a back surface of the shedder.