JPH0328469Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a bendable rod-shaped light-emitting display body suitable for use in decorative lights of displays, neon signs, etc.

[Conventional technology]

As one of the main rod-shaped light-emitting displays, the present applicant has already proposed a structure as shown in FIG. 8 (Japanese Patent Application No. 59-276064).

That is, this light-emitting display body includes a large number of light-emitting elements 1.
The electrodes 101a and 101b of 00 are connected in parallel to insulating coated conductive wires 102a and 102b, and the conductive wires 102a and 102b are twisted between the light emitting element 100, and the whole is connected to the flexible envelope 103. It is said to have a structure encapsulated by

A light emitting display body having such a structure has an envelope 103
is flexible, the light emitting element 100 is located approximately on the center line of the flexible envelope 103 (in other words, approximately on the center line of the rod-shaped light emitting display), and the conductive wires 102a and 102b are twisted together. Since it is located almost on the center line, it has the advantage that it can be easily bent in any direction and shape.
On the other hand, the following problems arose.

(Problems to be Solved by the Invention) In other words, such a light-emitting display device uses a wire-based power feeding method in which a large number of light-emitting elements 100 are connected in parallel and power is supplied from one or both ends, as shown in the circuit diagram of FIG. Since it has a structure based on means, and the forward equivalent internal resistance r of the light emitting element 100 is low,
Due to the influence of the electrical resistance r of the conductive wires 102a and 102b, even if light emitting elements having the same electro-optic characteristics are used, the current flowing through each light emitting element 100 is different, and as a result, each light emitting element 100
There is a problem that the brightness of the images varies.

In other words, when power is supplied from one end of the light-emitting display as shown in FIG. When power is supplied from both ends of the light-emitting display with one end serving as an anode and the other end serving as a cathode, as shown in FIG. be.

To avoid this problem, use conductive wires with low electrical resistance or reduce the number of light-emitting displays connected to the same conductive wire so that it is difficult to discern the apparent decrease in brightness. In the former case, if the conductive wires are made of the same material, the wire diameter needs to be increased, and in the latter case, it is necessary to supply power to each block of the light emitting display. This increases the number of conductive wires required, and in either case, the diameter of the light-emitting display increases, resulting in various practical limitations.

The present invention aims to provide an excellent rod-shaped light emitting body that can solve these problems without sacrificing the advantages of the light emitting display described above.

(Means for Solving the Problems) That is, the present invention provides a rod-shaped light-emitting display body in which a large number of light-emitting elements are arranged in a row and is housed in a flexible envelope whose light-emitting surface side is transparent. each light emitter element is located approximately on the centerline of the flexible envelope;
The gist is that they are connected in series via spiral or meandering conductive wires.

(Operations and Effects) With the rod-shaped light-emitting display having such a configuration, the light-emitting element is located approximately on the center line of the flexible envelope (in other words, approximately on the center line of the rod-shaped light-emitting display). , stress when bending the light-emitting display body is less likely to be applied to the light-emitting element. Moreover, since each light emitting element is connected via a spiral or meandering conductive wire, the light emitting display can be folded by the spring action of the spiral conductive wire or the bellows action of the meandering conductive wire. The stress of singing will be satisfactorily absorbed. Therefore, when used as a decorative light for a display, a neon sign, etc., it can be easily bent in any direction without worrying about troubles due to stress.

Furthermore, when the light emitting elements are connected in series in this way, the current flowing through the conductive wire is small, and the same current flows through each light emitting element regardless of the electrical resistance of the conductive wire, so each light emitting element The brightness of the element is constant. Therefore, since the wire diameter of the conductive wire can be made extremely thin, the light emitted from the light emitting element is only partially blocked by the thin conductive wire, and the 360-degree circumference of the flexible envelope is blocked by the thin conductive wire. This makes it possible to perform light emitting display in any direction.

Hereinafter, the present invention will be described in detail with reference to Examples.

(Example) FIG. 1 is a partially cutaway perspective view of an embodiment of the rod-shaped light-emitting display of the present invention, and FIG. 5 is a cross-sectional view of the same embodiment, where 1 is a light-emitting element, is a conductive wire, 3
indicates a flexible envelope.

As shown in FIG.
A semiconductor chip 11 such as a known light emitting diode made of gallium aluminum arsenide (CaAlAs) is sealed with a transparent thermosetting resin 12, and an electrode (for example, a cathode side electrode) 13a that supports the semiconductor chip 11 and The structure is such that electrodes (for example, anode side electrodes) 13b connected to the semiconductor chip 11 via bonding wires 14 protrude from both sides.

As shown in FIG. 1, the light-emitting elements 1 are arranged in multiple rows and enclosed in a transparent flexible core material 4, and the polarity of the electrodes is the same in the radial direction of the flexible envelope 3. Each light emitting element 1 is oriented with one electrode (for example, an anode side electrode) 13b facing downward and the other electrode (for example, a cathode side electrode) 13a facing upward so that the light emitting elements 1 are aligned with each other. And these electrodes 13
The tips of a and 13b protrude from the flexible core material 4, and the different electrodes 13a and 13a of these adjacent light emitting elements 1 and 1
13b are connected in series by respective spiral conductive wires 2 wound around the outer periphery of the flexible core material 4, so that the light emitting element 1 is located approximately on the center line of the flexible envelope 3 (in other words, The rod-shaped light-emitting display of the present invention is constructed by encapsulating the entire body with a cylindrical flexible envelope 3 so as to be located on the flexible core 4 or substantially on the center line of the rod-shaped light-emitting display.

The flexible envelope 3 is a translucent envelope made of, for example, soft polyvinyl chloride resin, acrylic resin, polyethylene resin, polycarbonate resin, silicone rubber, etc. In this embodiment, the flexible envelope 3 The entire structure is made translucent, and is preferably configured to enhance light diffusivity by adding a light diffusing agent or the like. However, it is not essential for the flexible envelope to have such a configuration; it is sufficient that at least the light-emitting surface side is transparent, and in some cases, the outside may be transparent as shown in FIG. For example, the tube is further coated with a light flexible tube 31.
This can be configured as desired.

The flexible core material 4 is also molded from the same material as the flexible envelope 3, and preferably contains a light diffusing agent or the like to increase the light diffusing agent.

FIG. 2 is a perspective view showing another embodiment of the present invention, in which every other light emitting element 1 is oriented so that the polarities of the electrodes of adjacent light emitting elements 1 are alternately reversed. The different electrodes 1 of the adjacent light emitting elements 1 are installed in the flexible core material 4 upside down.
3a and 13b are connected by a meandering conductive wire 2'. In this case, instead of the meandering conductive wire 2', it is also possible to use a spiral conductive wire with a small winding diameter. The rest of the configuration is the same as that of the embodiment shown in FIG. 1, so a description thereof will be omitted.

3 and 4 are circuit diagrams of the rod-shaped light emitting display shown in FIGS. 1 and 2, respectively, and R is a conductive wire 2.
It is expressed as the combined resistance of the electrical resistance of The current flowing through the lines 2, 2' is small, and the same current flows through each light emitting element 1 regardless of the electrical resistance R. Therefore,
The brightness of each light emitting element 1 is constant, and the conductive wire 2,
Since the wire diameter of 2' can be made extremely thin,
The light emitted from the light-emitting element 1 is only partially blocked by the thin conductive wire 2, making it possible to perform a light-emitting display in any direction of 360 degrees around the flexible envelope 3. It is.

Further, in the case of a rod-shaped light-emitting display having the above structure, the light-emitting element 1 is located approximately on the center line of the flexible envelope 3 (in other words, approximately on the center line of the rod-shaped light-emitting display). This makes it difficult for stress to be applied to the light-emitting element 1 when the light-emitting display is bent. Moreover, since each light emitting element 1 is connected via the spiral or meandering conductive wires 2, 2', the spring action of the spiral conductive wire 2 or the bellows action of the meandering conductive wire 2' Therefore, the stress caused when the light-emitting display body is bent can be satisfactorily absorbed. Therefore, when used as a decorative light for a display, a neon sign, etc., it can be easily bent in any direction without worrying about troubles due to stress.

Furthermore, by aligning the light-emitting surfaces of the light-emitting element 1 in a certain direction and covering only the light-emitting surface side with a flexible envelope that is transparent, it is possible to perform a light-emitting display only in a certain direction. be. In that case, it is desirable to form the opposite side surface with a reflective material to increase the brightness.

be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the rod-shaped light emitting display of the present invention, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIGS. 5 is a cross-sectional view of the embodiment shown in FIG. 1, FIG. 6 is a cross-sectional view of still another embodiment of the present invention, and FIG. 7 is a light emitting body. 8 is a perspective view of the prior example, and FIGS. 9A and 9B are electrical circuit diagrams of the prior example. 1... Light emitting display body, 13a, 13b... Electrode,
2, 2a, 2a'... Conductive wire, 3... Flexible envelope,
4...Flexible core material.

Claims (1)

[Scope of utility model registration request] A rod-shaped light-emitting display body in which a large number of light-emitting elements are arranged in a row and housed in a flexible envelope whose light-emitting surface side is translucent, and each light-emitting element is arranged in a row almost entirely within the flexible envelope. A bendable rod-shaped light emitting display body located on a center line and connected in series via a spiral or meandering conductive wire.