JPH0627995B2 - Display device - Google Patents

Description

The present invention relates to a large-sized display device installed outdoors.

[Summary of the Invention] The present invention relates to a display device, in which a conductive layer is provided on the front surface of a fluorescent display element, and the conductive layer is grounded to prevent static electricity and prevent adsorption of dust and the like. .

[Conventional technology]

The applicant of the present application has previously proposed a large-sized display device to be installed outdoors (Japanese Patent Application No. 59-82,257, etc.).

By the way, in this device, as shown in FIG.
(Equivalent to the figure), for example, 24 fluorescent display elements (40)
Are arranged in a 4 × 6 matrix to form one unit. For example, 6300 units of this unit are 100 × 63.
Are arranged in a matrix (not shown) of, for example, 25 m
A large display device of × 40m is formed. The total number of elements in this case is 151200.

However, in this device, a high voltage of about 5 to 10 kV as a so-called anode voltage is applied to each display element (40). As a result, static electricity is generated on the front surface of each display element (40), and dust, small insects, or the like may be adsorbed, and the display brightness may be reduced.

[Problems to be solved by the invention]

The conventional device is configured as described above. For this reason, in this device, the front surface of the display element is charged and adsorbs dust, small insects, and the like, thus lowering the display brightness.

[Means for solving problems]

The present invention provides a plurality of fluorescent display elements (40) arranged in an XY matrix, a transparent conductive layer (11) provided on the front surface of each of the plurality of fluorescent display elements, and a plurality of the fluorescent display elements. A conductive reflector (623) which is provided above each and reflects the display of each fluorescent display element toward the viewer located below.
And a grounding member for grounding the transparent conductive layer and the conductive reflecting surface
A display device comprising (1).

[Action]

According to the above-mentioned device, since the front surface of the display element and the reflection plate provided above the display element is grounded, the front surface is prevented from being charged and dust and small insects are prevented from being adsorbed. There is no fear of a decrease in brightness due to this, and good display can always be performed.

〔Example〕

FIG. 1 shows a cross section of the unit. In this figure, a transparent conductive film (11) is provided between the front panel (1A) of the display element (40) and the protective film (605). As the transparent conductive film, for example, ITO (Indium Tein Oxide) may be vapor-deposited to a thickness of about 1 μm, or carbon may be melted with a binder and applied in a mesh form.

This conductive film (11) is grounded. As this grounding method,
For example, as shown in the figure, the conductive film of the outer element (40A) (40D)
(11) is the inner element (40B) via the flexible conductor (12)
Connected to the conductive film (11) of (40D), the conductive film (11) of this element (40B) (40C) is connected to the conductive plate (13), this conductive plate (13) of the unit case (600) It is connected with a screw (14) to a ground plate (1) vertically provided in the center of the front surface. Each conductive film (11) and flexible conductor (12) or conductive plate (13)
Ultrasonic soldering (cell sorter, etc.)
Alternatively, the conductive anisotropic adhesive material (15) may be sandwiched between them to be pressure bonded.

Further, the above-mentioned ground plate (1) is formed by, for example, grounding a stainless steel plate or the like constituting the mirror surface (623) provided on the eaves (622) on the upper side of each display element (40) of the unit case (600). ) Is also used to prevent charging and the like.

Further, as shown in FIG. 2, both ends of the above-mentioned ground plate (1) are connected to one end of the metal conductor (3) with screws (2b), and the other end of the metal conductor (3) is connected with screws (2c). ) Is connected to the rear cover (606) of the unit case (600).

The rear cover (606) is usually made of a conductive metal, and is attached to a steel aggregate or the like constituting the sub module with a conductive bolt (608).

Therefore, according to this device, the conductive film (11) is the conductive plate (13) →
The screw (14) → ground plate (1) → screw (2b) → metal conductor (3) → screw (2c) → the rear cover (606) is grounded to the iron aggregate or the like constituting the submodule.

The specific structure of the mirror surface (623) and the ground plate (1) is as shown in FIG. 3, for example, and the portion where the ground plate (1) is provided is notched as shown by the broken line on the eaves (622). Has been.

In this way, the conductive film (11) is grounded. Therefore, in this device, the front surface of the display element (40) is prevented from being charged, and the adsorption of dust, small insects, etc. is prevented, so that there is no fear of lowering the display brightness.

Further, FIG. 4 shows another example. In this example, the conductive plate (13) is led out to the back side of the display element (40) and is connected to each other on the back side to be grounded.

FIG. 5 also shows another example. In this example, the conductive foil (16) connected to the conductive film (11) has a front panel (1A) and a side plate (1C).
Insert it into the inside of the display element (40) from between
It is derived as an arbitrary grounding lead (17).

Also in these other examples, the effects are the same as those in the above-described embodiments.

〔The invention's effect〕

According to the present invention, since the front surface of the display element and the reflection plate provided above the display element is grounded, the front surface is prevented from being charged and dust and small insects are prevented from being adsorbed. It is now possible to always perform good display without fear of deterioration of brightness due to.

[Brief description of drawings]

FIG. 1 is a block diagram of an example of the present invention, FIGS. 2 to 5 are diagrams for explaining the same, and FIG. 6 is a diagram for explaining a conventional apparatus. (1) is a ground plate, (11) is a conductive film, (13) is a conductive plate, (40) is a fluorescent display element, and (600) is a unit case.

Claims (1)

[Claims] 1. A plurality of fluorescent display elements arranged in an XY matrix, a transparent conductive layer provided on the front surface of each of the plurality of fluorescent display elements, and provided above each of the plurality of fluorescent display elements. And a conductive reflection plate that reflects the display of each fluorescent display element toward the viewer located below, and a grounding member that grounds the transparent conductive layer and the conductive reflection surface. Display device.