JPH11184416A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in light emission efficiency when irradiation light of a light source is made incident on a reflection plate through a light transmission plate in a display device displaying various guidance on both surfaces. SOLUTION: A light transmissive transparent acrylic resin plate is used as the light transmission plate 6, and light reflecting white or color near to transparent dot printing 6a, 6b are formed on its light irradiation surface of both side surfaces. Display plates 4a, 4b directly printed with a character and a mark, or that display bodies such as a photograph film, etc., added with the character and the mark are stuck to their surfaces and diffusing the light mode incident from the light transmission plate 6 and displaying various guidance are arranged adjacent to the light irradiation surface formed with the dot printing 6a, 6b of this light transmission plate 6. Further, three surfaces of the light transmission plate except the surface arranged with a light source 1 and the light irradiation surfaces arranged with the display plates 4a, 4b are surrounded with outer frames 5a, 5b, 5c, and a display device is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying various kinds of guidance on both sides.

[0002]

2. Description of the Related Art There are cases where various types of guidance such as entrances and exits of buildings are provided on both sides of a display device using a display device using a guide light or an indicator light as a light source. FIG. 4 is an exploded perspective view showing an example of such a display device. In FIG. 4, 1
Denotes a light source and a virtual attachment position is indicated by a broken line.
Reference numerals 2 and 3 denote light guide plates, each of which has a large number of dot prints 2a and 3a for light reflection formed on one surface thereof. In addition, the surfaces 2b and 3b of the light guide plates 2 and 3 on which the dots are not printed form light irradiation surfaces.

The light guide plates 2 and 3 are arranged such that the surfaces on which the dot prints 2a and 3a are formed face each other (the dot print 3a is not shown in FIG. 4). Reference numerals 4a and 4b denote display plates for diffusing light incident from the light guide plates 2 and 3 to display various kinds of guidance. On the display boards 4a and 4b, there are a case where characters and symbols for guidance are directly printed and a case where a display body such as a photographic film with the characters and symbols for guidance is attached to the surface. 5a, 5b and 5c are outer frames.

As the light guide plates 2 and 3, light transmitting members,
For example, a transparent acrylic resin plate is used. As the shape of the dot prints 2a and 3a formed on one surface, an appropriate shape such as a circle or a square is selected. The dot prints 2a and 3a are formed in white or nearly transparent color, and reflect the irradiation light from the light source 1 to enter the display plates 4a and 4b from the light irradiation surfaces 2b and 3b.

FIG. 5 is a schematic perspective view of the display device having the structure shown in FIG. 4 after assembling, and FIG. 6 is a view taken along the line AA in FIG.
FIG. 4 is a side view of the light guide plates 2 and 3 viewed in a direction cross section. As shown in FIG. 6, when the light source is turned on, irradiation light Xa from the light source becomes:
Dot printing 3a partially formed on one surface of light guide plate 3
The reflected light Za is reflected from the light irradiation surface 3b to the display panel 4
b. A part of the irradiation light Xa passes through the light guide plate 3 and enters the light guide plate 2, and enters the display plate 4 a from the light irradiation surface 2 b of the light guide plate 2.

Similarly, the irradiation light Xb from the light source is partially reflected by the dot print 2a formed on one surface of the light guide plate 2, and the reflected light Zb is incident on the display plate 4a from the light irradiation surface 2b. You. A part of the irradiation light Xb passes through the light guide plate 2 and enters the light guide plate 3, and enters the display plate 4 b from the light irradiation surface 3 b of the light guide plate 3. In this manner, the irradiation light of the light source enters the display plates 4a and 4b from the light irradiation surfaces 2b and 3b of the light guide plates 2 and 3, thereby causing the display plates 4a and 4b to emit light.
In b, guidance of a predetermined character or symbol is displayed. That is, various types of guidance such as entrances and exits of buildings are provided on both sides of the display device.

[0007]

As shown in FIG. 6,
Using two light guide plates 2 and 3, the dot printing 2a, 3
When the irradiation light of the light source is incident with the surface on the side where a is formed facing the surface, the light emission efficiency is reduced when the irradiation light passes through the interface between the two light guide plates 2 and 3, and the guide display becomes difficult to see. There was a problem. Further, since two light guide plates are required, there is a problem that the installation space of the display device is increased, and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and prevents a decrease in luminous efficiency when light emitted from a light source is incident on a display plate from a light irradiation surface of a light guide plate. It is an object of the present invention to provide a display device that can reduce installation space and cost.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device comprising a light guide plate formed of a light transmissive member and having a plurality of light reflecting means formed on both light irradiation surfaces. A configuration including a display plate that is disposed adjacent to each of the light irradiation surfaces on both sides of the light plate and displays various kinds of guidance, and an outer frame surrounding three surfaces of the light guide plate excluding the light irradiation surface on both the light source arrangement surface and both surfaces; Is achieved by doing

As described above, in the present invention, the light reflecting means is formed on the light irradiation surfaces on both sides of the single light guide plate, and the display plate is arranged adjacent to the light irradiation surfaces on both sides of the light guide plate. Since the guidance display is performed on both sides of the display device, it is possible to prevent a decrease in luminous efficiency. In addition, since a single light guide plate is used, installation space can be saved, and an inexpensive display device can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the display device, FIG. 2 is a schematic perspective view of the display device after assembly, and FIG. 3 is a side view as viewed in a cross section taken along line BB in FIG. The same components or corresponding parts as in the conventional example of FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 6 denotes a light guide plate according to the present invention, which is a light-transmitting transparent acrylic resin plate, and has a white or nearly transparent dot print 6 for light reflection on the light irradiation surfaces on both side surfaces thereof.
a and 6b (dot printing 6a is not shown in FIG. 1). The display plates 4a and 4b are arranged adjacent to the light irradiation surface of the light guide plate 6 on which the dot prints 6a and 6b are formed. The shape of the dot prints 6a and 6b can be made brighter by increasing the light diffusion effect of the display boards 4a and 4b by making the shape closer to the light source 1 smaller and making the size farther from the light source 1 larger. An outer frame 5a, 5b, 5c surrounds the upper surface of the light guide plate 6 in which the light source is arranged and three surfaces excluding the two light irradiation surfaces on which the display plates 4a, 4b are arranged adjacent to each other.

In this manner, the light guide plate 6, the display plates 4a, 4
b, disposing the outer frames 5a, 5b, 5c to assemble the display device as shown in the perspective view of FIG. In some cases, a reflective sheet may be attached to the inner surface of each outer frame facing the light guide plate 6 in order to increase the luminous efficiency of the display device. Since this display device uses a single light guide plate 6, the installation space can be saved and the display device can be made inexpensive.

When the light source 1 is turned on, the irradiation light Xc is incident on the light guide plate 6, a part of which is reflected by the dot printing 6a, and the reflected light Zc is incident on the display plate 4b from one light irradiation surface. In addition, part of the irradiation light Zc passes through the light guide plate 6,
The transmitted light Yc enters the display panel 4a from the other light irradiation surface.

Similarly, the irradiation light Xd of the light source is incident on the light guide plate 6, and a part thereof is reflected by the dot printing 6b to form the reflected light Zd.
d enters the display panel 4a from the light irradiation surface. Further, part of the irradiation light Zd passes through the light guide plate 6, and the transmitted light Yd enters the display plate 4b from the opposite light irradiation surface.

In the display device of the present invention, the dot printing 6a, 6 which is a light reflecting means is provided on the light irradiation surfaces on both surfaces of the single light guide plate 6.
b is formed, and the display plates 4a and 4b are arranged adjacent to the light irradiation surfaces on both surfaces of the single light guide plate 6. For this reason, it is possible to prevent a decrease in luminous efficiency as occurs in a display device in which two conventional light guide plates are combined. Therefore,
Guidance of characters and symbols can be displayed on the display boards 4a and 4b with a predetermined brightness, and various types of guidance can be effectively performed on both sides of the display device.

[0017]

As described above, in the present invention,
A large number of light reflecting means are formed on the light irradiation surfaces on both sides of a single light guide plate, and the display plate is arranged adjacent to the light irradiation surfaces on both sides of this light guide plate to guide and display on both sides of the display device. Therefore, a decrease in luminous efficiency can be prevented. In addition, since a single light guide plate is used, installation space can be saved, and an inexpensive display device can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a display device according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a state of assembling the display device.

FIG. 3 is a side view of the light guide plate as viewed in a section taken along line BB of FIG. 2;

FIG. 4 is an exploded perspective view showing a conventional display device.

FIG. 5 is a schematic perspective view showing a state of assembling a conventional display device.

FIG. 6 is a side view of the light guide plate as viewed in a section taken along line AA of FIG. 5;

[Explanation of symbols]

 Reference Signs List 1 light source 2, 3, light guide plate 2a, 3a dot printing 4a, 4b display plate 5a, 5b, 5c outer frame 6a, 6b dot printing

Claims (1)

[Claims] 1. A light guide plate formed of a light transmissive member and having a large number of light reflection means formed on both light irradiation surfaces, and disposed adjacent to the light irradiation surfaces on both surfaces of the light guide plate, respectively. A display device comprising: a display plate for displaying guidance; and an outer frame surrounding three surfaces of the light guide plate excluding a light source arrangement surface and light irradiation surfaces on both surfaces.