JP2000067378A - Internal illumination type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with excellent energy saving property, economical property, maintainability and diversity and high versatility and reliability. SOLUTION: A sign plate part 3 modeling a sign by a half translucent part and an opaque part is disposed in the front surface part of a casing 4, and the rear side of the sign plate part 3 is irradiated by a light emission part 2 disposed inside the casing 4 to perform displaying. Together with that, the light emission part 2 constituted by attaching plural light emitting diodes 6 to a light transmission surface part 5 is disposed in the internal space S of the casing 4, and a reflection surface 8 is provided on the inner surface of the casing 4 excluding the front surface part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internally illuminated display device suitable for use as a traffic sign, a display board, a signboard, and the like installed on a road.

[0002]

2. Description of the Related Art In general, various traffic signs (display devices) are installed at intersections and curves of roads in order to ensure smooth running and safety of automobiles.

[0003] By the way, this type of traffic sign needs to be surely recognized by the driver even at night, and therefore, a technique is usually applied to reflect the headlight light of the vehicle so that the driver can easily recognize it. However, there is also a weak point that can hardly be recognized from a distance away from the headlight.

[0004] For this reason, conventionally, in an important installation place having a high danger, an internally illuminated display device that can be recognized even from a long distance, that is, a semi-light-transmitting portion and a non-light-transmitting portion are provided on the front surface of the casing. A sign board part that imitates a sign is arranged, and
There is also used an internally illuminated display device in which a fluorescent tube disposed inside a casing illuminates the back side of the sign plate portion to perform display.

[0005]

However, since the conventional internally illuminated display device uses a fluorescent tube from the viewpoint of securing the illuminance, it has the following problems.

First, since a power line for lighting a fluorescent tube is required, power consumption is increased and energy saving and economic efficiency are poor.

Secondly, since it cannot be installed in a mountainous area or the like where a power line does not pass, the place where it can be installed is limited and lacks versatility.

Thirdly, since one or several fluorescent tubes are used, if the fluorescent tubes are not turned on due to a service life or the like, they directly affect night recognition, and are inferior in reliability and very difficult to maintain. Become.

Fourth, since the fluorescent tube does not light up instantaneously,
Lack of versatility, such as being unable to perform blinking display at a relatively short cycle.

The present invention has solved the problems existing in the prior art as described above, and is excellent in energy saving, economy, maintenance, and versatility, and is highly versatile and reliable. The purpose is to provide the device.

[0011]

According to the present invention, a sign plate 3 having a sign 7 formed by a semi-light-transmitting portion 7a and a non-light-transmitting portion 7b is provided on the front surface of a casing 4. At the same time, when configuring the internally illuminated display device 1 that illuminates the back side of the sign plate portion 3 with the light emitting portion 2 disposed inside the casing 4 to perform display, the light emitting portion 2 is disposed in the internal space S of the casing 4 and in the light transmitting surface portion 5. A light emitting unit 2 having a plurality of light emitting diodes 6 attached thereto is provided, and a casing 4 excluding a front surface portion is provided.
Is characterized in that a reflection surface 8 is provided on the inner surface of the.

In this case, according to a preferred embodiment, the light emitting unit 2 is disposed at an intermediate position between the front and rear surfaces of the casing 4 with the light emitting diodes 6. The part 3 is a sign board 1 that imitates the sign 7
1 and a light diffusing sheet 1 attached to the back of the sign board 11
2. Further, the internally illuminated display device 1 is suitable for use in a traffic sign 1t.

[0013] As a result, since light emitting diodes 6 with low power consumption are used for the light emitting section 2, they are lit by a solar cell or a battery, thereby eliminating the necessity of a power line and disposing a plurality of light emitting diodes 6, preferably in a rearward direction. The light emitted from the plurality of light emitting diodes 6 is applied to the rear of the internal space S of the casing 4, reflected by the reflection surface 8 provided on the inner surface of the casing 4 excluding the front surface, and emitted forward through the light transmitting surface 5. Is done. As a result, the back side of the sign board 3 is irradiated with indirect light, and sufficient illuminance and uniform light (surface light emission) are secured. Further, even if one of the light emitting diodes 6 fails, there is almost no effect on the overall illuminance.

A display device using a light emitting diode is also known. However, this type of display device usually displays characters (graphics) by the light emitting diode itself, and thus displays dots (dots). However, since the diodes 6 used in the present invention are used for irradiating the marker plate 3, extremely high recognizability can be obtained.

[0015]

Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.

First, the configuration of a traffic sign 1t (internally illuminated display device 1) according to the present embodiment will be described with reference to FIGS.

The internally illuminated display device 1 includes a casing 4 having an internal space S. The casing 4 has a rhombic shape when viewed from the front, is formed flat in the front-rear direction, and opens the front part. The inner surface of the casing 4, that is, the inner surface of the rear and side surfaces of the casing 4, excluding the front surface, is provided with a reflective surface 8 by coating with a reflective material 13 using a white sheet material or paint.

On the other hand, as shown in FIG. 3, on the front surface of the casing 4, there is provided a sign plate portion 3 in which the sign 7 is formed by a semi-transparent portion 7a and a non-light-transmitting portion 7b. The internal space S is sealed by closing the portion. As shown in FIGS. 2 and 3, the sign plate portion 3 is a sign plate 11
And a light diffusion sheet 12 adhered to the back surface of the sign plate 11. The light diffusion sheet 12 may be in the form of a film or a plate. The sign board 3 of the embodiment is
In order to represent the "crossroads intersection", the sign board 11 is a black sheet (non-light-transmitting portion 7b) on the back surface of the plastic transparent plate 14.
The frame part 7bf and the cross figure part 7bc formed by the above are adhered, and furthermore, the yellow light diffusion sheet 12 (semi-transparent part 7a) covering the entire back surface of the transparent plate 14 is adhered.

The light emitting section 2 is disposed in the internal space S of the casing 4. The light emitting section 2 is configured by attaching a plurality of light emitting diodes 6 to a light transmitting surface section 5 using a transparent plastic plate, a rigid net or the like. Specifically, as shown in FIG. 2, a hole is made in a transparent plastic plate, light emitting diodes 6 are inserted from one side, and then connected in parallel using a thin conductive wire W on the other side. At least several tens of light emitting diodes 6 are used, and are arranged at regular intervals vertically, horizontally and as shown in FIG. The light emitting unit 2 is disposed at an intermediate position between the front surface and the rear surface of the casing 4 such that the light emitting diodes 6 face backward. In this case, the distance Xr between the rear surface portion of the casing 4 and the light transmitting surface portion 5 and the distance Xf between the front surface portion of the casing 4 and the light transmitting surface portion 5 are set to optimal distances in advance.

Next, the use and operation of the traffic sign 1t according to the present embodiment will be described with reference to FIGS.

First, as shown in FIG. 4, the traffic sign device 1t can be installed on the road by attaching the rear surface of the casing 4 to the pole 21 via the attachment fittings 22 and 23. Further, a solar cell unit 25 is attached to the upper end of the pole 21, and power is supplied from the solar cell unit 25 to the light emitting diodes 6.

In this case, the solar cell unit 25 includes a battery for charging the electric power generated by the solar cell, an automatic lighting circuit at night, and the like, and the lighting of the light emitting diodes 6 is controlled by the solar cell unit 25. Therefore, the light emitting diodes 6 can be automatically turned on at night, and can be turned on and off at regular time intervals if necessary.

When the light emitting diodes 6 are turned on, the light L of the light emitting diodes 6 is irradiated to the rear of the internal space S of the casing 4 as shown in FIG. The light L is reflected by the reflector 13 (reflecting surface 8) provided on the inner surface of the casing 4 excluding the front surface portion, is irradiated forward through the light transmitting surface portion 5, and has a frame portion 7bf formed of a black sheet.
Then, the light is irregularly irradiated to the outside through the light diffusion sheet 12 and the transparent plate 14 excluding the cross graphic portion 7bc.

Therefore, since the back side of the marker plate 3 is illuminated by the indirect light of the large number of light emitting diodes 6, a sufficient illuminance and uniform light (surface emission) are ensured. In addition, since the light emitting diodes 6 with low power consumption are used, they are lit by a solar cell or a battery, and energy saving and economy can be enhanced by reducing power consumption. Can be installed, increasing versatility. Moreover, since a large number of light emitting diodes 6 are used, even if a failure occurs in a single unit, the overall illuminance is hardly affected, and the reliability is excellent.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The configuration, shape, quantity, material, and the like of the details can be arbitrarily changed without departing from the gist of the present invention. For example, the color of the marker plate portion 3 can be freely set by combining the colors of the light emitting diodes 6... And further by combining the color of the light emitting diodes 6 and the color of the diffusion sheet 12.
The configuration of the sign board 3 is not limited as long as it has the same display function. Further, the sign 7 can be applied to any type of traffic sign other than the example, and can be applied to any internally illuminated display device 1 other than the traffic sign 1t.

[0026]

As described above, in the internally illuminated display device according to the present invention, the sign plate having the sign formed by the semi-transmissive portion and the non-transmissive portion is arranged on the front surface of the casing. In an internally illuminated display device that illuminates the back side of a sign board portion with a light emitting portion arranged inside and displays an image, a light emitting portion configured by attaching a plurality of light emitting diodes to a light transmitting surface portion is arranged in an internal space of a casing. In addition, since the reflecting surface is provided on the inner surface of the casing except for the front portion, the following remarkable effects can be obtained.

Since a plurality of light emitting diodes are used in the light emitting unit, the light emitting unit is lit by a solar cell or a battery, so that energy saving and economic efficiency can be improved, and blinking display at a relatively short cycle can be easily performed. Excellent in diversity.

Since a power line is not required, it can be installed in a mountainous area or the like, and versatility can be improved.

Even if a single light emitting diode fails, the overall illuminance is hardly affected, so that the reliability and the maintainability are excellent.

In particular, in a normal display device using a light emitting diode, since characters and figures are formed by the light emitting diode itself, dot display is performed, and the recognizability is poor.
Since the diodes used in the present invention are used for irradiating the sign board, extremely high recognizability can be obtained.

According to a preferred embodiment, the light emitting unit is
If the light emitting diode is disposed at an intermediate position between the front part and the rear part of the casing so as to face backward, the back side of the sign plate part is illuminated by indirect light of many light emitting diodes, so that sufficient illuminance and Uniform light (surface emission) can be secured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a traffic sign (internally illuminated display device) according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged sectional side view showing a part of the traffic sign;

FIG. 3 is a partially broken front view of the traffic sign device.

FIG. 4 is an external side view of the traffic sign device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal illuminated display device 1t Traffic sign device 2 Light emitting part 3 Marking plate part 4 Casing 5 Translucent surface part 6 ... Light emitting diode 7 Marker 7a Semi-translucent part 7b Non-light transmissive part 8 Reflecting surface 11 Sign plate 12 Light diffusing sheet S Interior space

Claims (4)

[Claims] 1. A sign plate having a semi-transmissive portion and a non-translucent portion as a sign is disposed on a front portion of a casing, and a light emitting portion disposed inside the casing is behind the sign plate. In the internally illuminated display device that performs display by irradiating
A light-emitting unit having a plurality of light-emitting diodes attached to a light-transmitting surface portion is provided in an inner space of the casing, and a reflection surface is provided on an inner surface of the casing except for the front surface portion. Illuminated display device. 2. The internally illuminated type according to claim 1, wherein the light emitting unit is disposed at an intermediate position between a front surface portion and a rear surface portion of the casing so that the light emitting diodes face rearward. Display device. 3. The internally illuminated display device according to claim 1, wherein the sign plate comprises a sign plate imitating a sign and a light diffusing sheet attached to a back surface of the sign plate. 4. The internally illuminated display device according to claim 1, wherein the display device is applied to a traffic sign.