JPH01116585A - Display device - Google Patents

Abstract

PURPOSE: To provide a large display device capable of improving the contrast of a unit display surface and provided with eaves having high heat resistance and conductivity by arranging plural fluorescent display elements (units) like an X-Y matrix, arranging conductive meshes in the front of the display elements and grounding the meshes. CONSTITUTION: A display cell 16 is composed of a fluorescent display cell part 17, a repeating substrate 18 and a plug substrate 19 and red, green and blue phosphor layers and grids, electrode units, etc., corresponding to the layers are stored in the cell part 17. Since conductive meshes 12 are arranged in the front of the units 2 and grounded in the display device, electrostatic charge to be generated due to high voltage supplied to the units 2 is removed, the deformation or the like of eaves due to heat is removed and the contrast is improved by the arrangement of the conductive meshes 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device suitable for use in obtaining a large-sized video screen placed outdoors.

[Summary of the invention]

The present invention relates to a display device suitable for use in obtaining a large-sized video screen to be placed outdoors.
A conductive mesh is provided in front of a plurality of fluorescent display elements arranged in a Y matrix, and this conductive mesh is grounded to improve heat resistance near the fluorescent display elements and prevent static electricity. This is what I did.

[Conventional technology]

The present applicant previously proposed a display device as disclosed in Japanese Patent Application Laid-Open No. 60-225878 as a display device for obtaining a large video screen to be placed outdoors. The display device that obtains this large video screen has a plurality of fluorescent display elements (2
) (hereinafter referred to as units) are arranged in an X-Y matrix, and an eaves (3) for blocking external light is provided above the front surfaces of these units. Figure 10 is A-A of Figure 9.
The eaves (3) are made of polycarbonate resin, and the surface is coated with black paint.
The underside of the eaves (3) is covered with a conductive stainless steel mirror surface (4).
) is provided. If configured like this, the sun (5)
The sunlight S from the sky, the blue sky, etc. are reflected on the display surface of the unit (2) (
6), but a part of this external light is blocked, and the contrast of the display surface (6) of the unit (2) when it emits light can be improved.

In addition, the image a displayed on the display surface (6) of the unit (2)
.

Images b and c are reflected by the mirror surface (4), and people who are close to the point directly below the large display device can also see the images (
, Images a, b, and c reflected by the mirror surface are virtual images.

Since it is projected as b I, cl, the vertical display discontinuity (caused by the eaves) of the large display device (11) is resolved.
1) Since the eaves (3) is made of synthetic resin, the mirror surface (4) is placed above the ground, so the unit (2)
In order to solve this problem, the applicant filed a patent application filed in Japanese Patent Application No. 59-2.
For example, 2.5m wide with a mirror surface grounded according to No. 44877.
, also proposed a large display device with a height of about 2 meters.

[Problem that the invention seeks to solve]

A large display device with a ridged eave can reduce the amount of external light that directly hits the display surface (6) of the unit (2), but it is possible to reduce the amount of external light that directly hits the display surface (6) of the unit (2). When projecting a black image, in order to create a black image without lighting up the light emitter in the unit (2), if you look at this black image from the front,
In some cases, it appears white, so even though it is called black, it has the disadvantage of appearing whitish black.

In order to eliminate this inconvenience, it is possible to arrange a transparent acrylic resin or the like with appropriate transmittance on the front surface of the display surface 16) of the unit (2), but it is easy to scratch and is not heat resistant. There were many other problems, such as surface reflection from the acrylic resin that made the screen unsightly and the refractive index changing, so it could not be used.

The present invention was made in consideration of the ridges, and its purpose is to improve the contrast of the unit (2) display surface (6), and to provide a large display device with an eave that has good heat resistance and conductivity. is to provide.

[Means for solving problems]

The display device of the present invention has a plurality of fluorescent display elements (Unin I-) (2) arranged in an X-Y matrix, as shown in FIG. A sexual mesh is provided, and this mesh side is grounded.

[For production]

The display device of the present invention has a 4-electrode mesh on the front of the unit (2) and is grounded.
It is possible to eliminate the electrical charge caused by the high voltage supplied to the screen, eliminate deformation of the eaves due to heat, and improve the contrast by disposing the conductive mesh.

(Embodiment) An embodiment of the display device of the present invention will be described in detail below with reference to FIGS. 1 to 8. In FIG. ), and a unit (2) is inserted and fixed into the plurality of lattice shelves αD from the back side of the display case 01. Further, the mackerel indicates a conductive mesh, and this conductive mesh is fixed to the back surface of the grid-shaped light-shielding unit 01 via an adhesive or the like. The lattice-shaped light-shielding unit α1 is fixed to the screw receiving portion α provided on the lattice shelf oD of the display casing 0υ with screws α.

In FIG. 1, one set of screw receivers 09 is shown installed only on one lattice shelf Q11.
The unit (2) is inserted and fixed in 000..., and the grid-shaped light shielding unit (2) has a conductive mesh (B) attached to the back side.
) is attached to the display case oI.

The above-mentioned unit (2), the conductive mesh and lattice light shielding unit αl, will be described in detail in FIG. 2 and below.

Figure 2 shows the display cell 01, showing the fluorescent display cell section and inside! ! It is composed of a substrate α and a plug substrate A, and the interior of the fluorescent display cell portion αη is described in detail in, for example, Japanese Patent Application No. 143777/1982 and Japanese Patent Application No. 82259/1987, both of which were previously proposed by the present applicant. Similarly, red, green, and blue phosphor layers, corresponding grids, electrode units, etc. are provided. A relay board (2) is provided on the back side of this fluorescent display cell surface,
Furthermore, a plug board 01 is attached to the back of this relay board (2). As shown in the figure, cylindrical protrusions (to) are integrally formed at two places on the left and right sides of the back surface of this plug board o1, and these protrusions (to) are used for positioning with respect to a unit (21, which will be described later). A plug (21) is arranged in the center, and a high voltage supply lead (22) protruding from the center back surface of the fluorescent display cell part 0η is connected to the through hole (2) of the relay board O1l.
3) into the plug (21). Nao (24)
indicates the terminal pin of the plug. As shown in Figure 3, each of these components is integrated with foamed silicone resin (25) to form the display cell 01, and the front side is marked with blue, red, and green. A band-shaped fluorescent band trio (27), (27)2&11 is formed, and a plug (21) protrudes from the rear. A plurality of such display cells O1 are combined to form a unit (powder). FIG. 4 shows a fluorescent display element constituting a large display device,
In other words, it indicates unit (2)), and 1 unit (2)
As shown in the fourth diagram, there are four display cells O1 in the horizontal direction, and
Four display cells Qe are arranged in an XY matrix in the vertical direction. The unit (2) consists of a front casing (2a) and a rear casing (2b), with a display cell drive unit in the front casing (2a) and a power supply unit in the rear casing (2b). It is arranged. A plurality of sockets (29) and holes (30) are arranged in an X-Y matrix on the panel (28) of the front housing (2a). These sockets) (29) and holes (3
0) is configured to fit with the plug (21) and two protrusions Q- of each display cell Oe. A plurality of units/units 121 (21...) assembled in this way are inserted into the lattice shelf OD of the display case O1 from the ■ side as shown in FIG.
It is fixed to the trellis QD by an appropriate method.

Next, the electrosensitive mensch (b) will be described in detail with reference to FIGS. 1 and 5. The conductive mesh (b) is made of a stainless steel plate (SO3) with a thickness of about 150 μm, and is made into a substantially rectangular shape that matches the size of the lattice-shaped light-shielding unit 031, which will be described later, as shown in Fig. 1. Window with part (12a) left (
A polygonal hole (quadrangular or hexagonal) having an appropriate aperture ratio is formed in 12b) by photo-etching or the like as shown in FIG.

The size of a regular hexagonal hole when waiting for a predetermined aperture ratio can be determined from the following equation. As shown in Fig. 5, when Px is the horizontal pitch between regular hexagons, py is the vertical pitch between regular hexagons, HX is the hole size of the regular hexagon, and when the aperture ratio is γ, the hole size is -f Py = Px - T "Py = 3 ・Px/2 ・r".In the case of a square, the hole size Hx is Px -
, r'r-, but the vertical pinch py differs depending on the shape of the rectangle, and in the case of a regular rectangle, it becomes PymaroPx.

After forming holes with an appropriate aperture ratio in this way, the display cell αQ
In order to improve the contrast, black paint (33) (see Figure 8) is applied to the front surface or, if necessary, also to the back surface. Such a unit-based four-electrode mesh @ is bonded to the back surface of a lattice-shaped light-shielding unit α1, which will be described later, via a suitable adhesive.

In the above embodiment, the conductive mesh Oa is provided with a lattice portion (12
Although we have explained an example in which the window (12b) is formed in the stainless steel plate, only the through holes with a predetermined opening ratio are formed in the stainless steel plate, and the lattice part (12b) is formed in the stainless steel plate.
The part corresponding to 2a) may be attached to the back surface of the lattice-shaped light-shielding unit) Ql via double-sided tape or the like, since the conductive mesh 0 is in contact with the screw receiving part Q9 of the display case O1 and the lattice shelf 00. becomes grounded. Of course, it may be actively grounded.

Next, place the lattice-shaped light-shielding unit 0, which will serve as the eaves, as shown in Figure 6.
A detailed description will be given of FIGS. As shown in the front view of Fig. 5, the lattice-shaped light shielding unit 0ri is composed of an eaves (3), a lattice part consisting of vertical bars (31), and an opening window (32).
It is molded from polycarbonate resin or the like. As shown in FIG. 8, the eave (3) is hollow and has a substantially triangular cross section. The vertical bar (31) is similarly hollow with an equilateral triangular cross section, and both block external light from the vertical and horizontal directions, and the length of the eaves (3) and the height of the vertical bar (31) By appropriately selecting the height H and the angle θ (see FIG. 7), it is possible to limit the elevation angle and viewing angle from left and right when viewing a large display screen. Furthermore, in order to improve contrast, the lattice-shaped light-shielding unit 0 is molded from black resin and coated with black paint if necessary. The vertical beam (31) has four mounting holes (34), and the conductive mesh side is attached to the back of the lattice-shaped light-shielding unit).
It is screwed into the screw receiving part α9 of No. 1. Figure 8 shows the display case α1.
7 is a cross-sectional view taken along line B-B'' when the unit (2) is inserted into the display case 01, and the lattice-shaped light-shielding unit a1 with a conductive mesh shown in FIG. 6 is attached to the lattice shelf of the display case 01. FIG.

When configured as described above, the conductive mesh αj operates as follows. As shown in Fig. 8, outside light S that passes through the eaves (3) and passes through the conductive mesh @ is reflected by the display surface of the display cell a, and the reflected light is transmitted through the conductive mesh a.
The external light that passes through the eaves passes through the conductive mesh twice, as in the case where it is attenuated by the conductive mesh, and the case where it is attenuated by the surface of the quadriconductive mesh α as shown in the external light St. In contrast, the light emitted from the fluorescent band trio of the display cell passes through the conductive mesh θ only once, so it is attenuated only once. This difference in attenuation will help improve the contrast of the display cell. For example, in the case of a mesh with an aperture ratio of r-80%, external light will be attenuated by 80X80%-64%, but the light from display cell 019 will be attenuated by 80 Furthermore, in this example, the conductive mesh is at ground potential
Therefore, it is possible to completely eliminate the charge on the lattice-shaped light-shielding unit a caused by the high voltage of 5 to 10 kV supplied to the display cell, and the conductive mesh curves are made of metal such as stainless steel. Therefore, it has good thermal conductivity and has a heat dissipation effect, which improves heat resistance.

It goes without saying that the present invention is not limited to the embodiments on the ridges, and that various modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

Since the present invention is structured like a ridge, it is possible to prevent charging of the grid-like light-shielding unit near the display cell, improve heat resistance, and improve the contrast and reflection of the display cell due to the application of black paint and the effect of the eaves. It has the effect of preventing

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an example of the display device of the present invention, FIG. 2 is an exploded perspective view showing an example of a display cell used in the display device of the present invention, and FIG. 3 is an exploded perspective view showing an example of the display device of the present invention. FIG. 4 is an assembled perspective view showing an example of a display cell used, FIG. 4 is a perspective view showing an example of a unit used in the display device of the present invention, and FIG. 5 is an assembled perspective view of a conductive mesh used in the display device of the present invention. FIG. 6 is a front view showing an example of the grating light-shielding unit 7) used in the display device of the present invention, FIG. 7 is a bottom view partially cut away from FIG. 6, and FIG. 8 is a front view showing an example. is B-B in Figure 6
9 is a front view of a conventional display device;
0 is a cross-sectional view taken along line A-A' in FIG. 9. +1) is a display device, (2) is a fluorescent display element, (unit), (3) is an eave, (6) is a display surface, αQ is a display case,
αD is a lattice shelf, (2) is a conductive mesh, α1 is a lattice-shaped light shielding unit, and α· is a display cell. 251!724S'7:lSintN翫幤9 to light^fistj艮se2ru-zute1tmuTbookltscrivenershipOtsuFigure3KyotoAkatsuUnit#1-PublishtffiHimei 1 raft m conventional V
Front entrance Figure 8 Figure 1a

Claims (1)

[Scope of Claims] A plurality of fluorescent display elements are arranged in an X-Y matrix, a conductive mesh is provided in front of the plurality of fluorescent display elements, and the conductive mesh is grounded. Display device.