JPS61248080A - Bendable bar-shaped light emitting display body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bendable rod-shaped light-emitting display body suitable for use in decorative lights for displays, neon signs, and the like.

(Prior Art) The present applicant has already proposed a structure as shown in FIG.
No. 9-276064).

That is, in this light-emitting display, each electrode 101a, 101b of a large number of light-emitting elements 100 is connected to a conductive wire 1 coated with insulation.
02a and 102b in parallel, and the conductive wire 10
2a and 102b are twisted together between the light emitting elements 100, and the entire structure is covered with a flexible envelope 103.

In a light-emitting display having such a structure, the envelope 103 is flexible, and 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 since the conductive wires 102a and 102b are twisted together and located almost on the center line, it has the advantage of being easily bent in any direction and shape. There was a problem like this.

(Problems to be Solved by the Invention) In other words, such a light-emitting display body is constructed by connecting a large number of light-emitting elements 100 in parallel as shown in the circuit diagram of FIG. The structure is based on a wire-connected power supply means for supplying power, and since the forward equivalent internal resistance r1 of the light emitting element 100 is low, the conductive wires 102a, 10
Due to the influence of the electrical resistance r of 2b, 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, the brightness of each light emitting element 100 is different. There is a problem with coming.

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 body, with one end serving as an anode and the other end serving as a cathode, as shown in FIG. 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 to reduce the apparent brightness. Measures such as making it difficult to distinguish may be considered, but 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, the diameter of the conductive wire must be increased, and in the latter case, the diameter of the conductive wire must be increased if the material of the conductive wire is the same. A conductive wire is required for supplying power to each block, which increases the number of conductive wires, and in either case, the diameter of the light-emitting display increases, resulting in various practical limitations.

The present invention provides, without impairing the advantages of the light emitting display described above,
The object of the present invention is to provide an excellent rod-shaped light emitter that can solve these problems.

(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 housed in a flexible envelope whose light-emitting surface side is transparent. Each light-emitting element is oriented such that the polarity of its electrode is aligned in the same radial direction of the flexible envelope and is located approximately on the center line of the flexible envelope, and the adjacent light-emitting elements The gist is that each conductive wire connecting different electrodes of the body element is configured to diagonally cross the center line of the flexible envelope.

(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, each light emitting element is oriented so that the polarity of the electrode is the same in the radial direction of the flexible envelope, and different electrodes of adjacent light emitter elements diagonally cross the center line of the flexible envelope. Each conductive wire connects the wires, resulting in a meandering series connection structure, so the stress when the light emitting display is bent can be satisfactorily absorbed by the bellows effect of this meandering connection structure. . Therefore, when used as a decorative light for a display, a neon sign, or the like, 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 this thin conductive wire, so that it can be This makes it possible to perform light-emitting display even when the light is on.

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

(Example) FIG. 1 is a perspective view of an example of the rod-shaped light emitting display of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along the line I--I of FIG. 1, in which 1 indicates a light emitting element, 2 a conductive wire, and 3 a flexible envelope.

As shown in FIG. 7, this light emitting element is a light-transmitting semiconductor chip 11 such as a known light emitting diode made of gallium arsenide (GaAs), gallium phosphorous (GaP), gallium aluminum arsenide (GaA6As), etc. An electrode (for example, a cathode side electrode) 13a that is sealed with a thermosetting resin 12 and supports the semiconductor chip 11, and an electrode (for example, an anode side electrode) 13b that is connected to the semiconductor chip 11 via a bonding wire 14. It has a structure that protrudes on both sides.

Such light-emitting elements 1 are arranged in multiple rows as shown in FIG. 1, and one electrode of each light-emitting element 1 ( For example, the anode side electrode) 13b is oriented on the upper side, and the other electrode (for example, the cathode side electrode) 13a is placed on the lower side. The different electrodes 13a and 13b of the adjacent light-emitting elements 1 and 1 are connected in series by respective conductive wires 2 that diagonally cross the center line of the flexible envelope 3, forming a meandering wire connection structure as a whole. ing. The rod-shaped light-emitting display of the present invention is constructed by encasing the light-emitting element 1 in a round bar-shaped flexible enveloping body 3 so that the light-emitting element 1 is located approximately on the center line of the flexible enveloping body 3. There is.

This flexible envelope 3 is made of, for example, soft polyvinyl chloride resin,
A light-transmitting envelope made of acrylic resin, polyethylene resin, polycarbonate resin, silicone rubber, etc. In this embodiment, the entire flexible envelope 3 is transparent, and preferably contains a light diffusing agent. It is configured to enhance light diffusivity. 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 further covered with a transparent flexible tube. It is possible to create any desired configuration, such as a configuration like this.

FIG. 4 is a longitudinal cross-sectional view showing an embodiment of a light emitting display with a different structure of the flexible envelope 3, and FIGS. FIG. 3 is a cross-sectional view taken along the line a-n, and the flexible envelope 3 in this embodiment includes an inner light-transmitting flexible tube 31 and an outer light-transmitting flexible tube 3.
2 and a transparent flexible resin 33 filled between them. The inner tube 31 has a built-in light emitting element 1, and each conductor 2 connecting different electrodes 13a and 13b of adjacent light emitting elements 1 has an electrode 13a projecting outward from the inner tube 31. , 13
It is connected to the tip of b by means such as soldering,
The overall wiring structure is meandering. ``The rod-shaped light-emitting display body as shown in FIG. 4 can be efficiently manufactured by the method shown in FIG. That is, as shown in FIG. 9(A), openings 311 are formed at intervals in the inner transparent flexible tube 31, and as shown in FIG. 9(B),
The light emitting element 1 is put into the tube 31 through the opening 311, the tip of one electrode 13b is penetrated to the outside, and the light emitting element 1 is positioned on the center line of the tube 311 and housed therein. Next, as shown in FIG. 3C, the conductive wire 2 is inserted diagonally through the opening 311 so that one end protrudes from the tube 31, and the different electrodes 13a and 13b of the adjacent light emitting elements 1 are soldered. Connect by means. After that, the same figure (d)
Cover with the outer transparent flexible tube 32 as shown in
A light-emitting display is manufactured by injecting a transparent flexible resin 33 into the inner tube 31 and between the inner and outer tubes 31 and 32 and solidifying it. In this case, the inner tube 31
You can change the type of resin injected between the inner and outer tubes 31.32, or change the resin injected between the inner and outer tubes 31.3.
The inner tube 31 may be made hollow by injecting resin only between the two spaces, or the outer tube may be omitted as shown in FIG.

Figure 3 is a circuit diagram of a light emitting display with the above configuration, and R
is the combined resistance of the electrical resistance of the conductive wire 2 and the forward equivalent internal resistance of the light emitter element 1. When the light emitter elements 1 are connected in series in this way, the current flowing through the conductive wire 2 is small and the same current flows through each light emitting element 1 regardless of the electrical resistance R, so the brightness of each light emitting element 1 is constant. Therefore, since the wire diameter of the conductive wire 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, and the periphery of the flexible envelope 3 is This makes it possible to perform light emitting display in any direction of 360 degrees.

In this case, for example, as shown in the circuit diagram of FIG. 8, several cathode-side conductive wires 'la, 2a', 2a'' are used to supply power to each block in which several light-emitting elements 1 are connected in series.
By providing a common anode-side conductive line 2b and controlling the lighting of each block selectively by variously changing the power supply pattern to the cathode-side conductive line, a variety of lighting displays can be achieved.

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). Therefore, stress when bending the light-emitting display body is applied to the light-emitting element 1.
In addition, each light emitting element 1 is oriented so that the polarity of the electrode is the same in the radial direction of the flexible envelope 3, and different electrodes 13a, 13b of adjacent light emitting elements 1 are aligned. The conductive wires 2 are connected diagonally across the center line of the flexible envelope 3, resulting in a meandering series connection structure as a whole, so that the light-emitting display is The stress that occurs when bending is absorbed satisfactorily.Therefore, when used for decorative display lights, neon signs, etc., it can be easily bent in any direction without worrying about troubles caused by stress. It becomes.

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.

In addition, when manufacturing a light emitting display having the structure shown in FIG. 4 by the method shown in FIG. 9, the light emitting element 1 and the conductive wire 2 are first inserted into the inner flexible tube 31 and connected. Since it is only necessary to repeat the steps one after another, mass production is extremely efficient and easy. Moreover, after arranging and connecting the light emitting elements 1 in the flexible tube 31 in advance, Since it is covered with the outer flexible tube 32 and flexible resin 33, the light emitting element 1 is necessarily located on the center line of the flexible cover 3, and the conductive wire 2 is necessarily placed diagonally on the center line. This is extremely advantageous because no special positioning work is required. Furthermore, there is no need to use special jigs or equipment in any manufacturing process, and general-purpose jigs and equipment can suffice, so there is the advantage that equipment costs are low.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the rod-shaped light emitting display of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line I-1 in FIG. 1,
FIG. 3 is an electric circuit diagram of the same embodiment, FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention, and FIGS. FIG. 6 is a cross-sectional view showing still another embodiment of the present invention, FIG. 7 is a cross-sectional view of a light emitting display, and FIG. 8 is a cross-sectional view of still another embodiment of the present invention. FIG. 9 is an explanatory diagram of the manufacturing method of the embodiment shown in FIG. 4, FIG. 10 is a perspective view of the preceding example, and FIG.
Figures 1 (a) and 1 (b) are electrical circuit diagrams of the prior example. DESCRIPTION OF SYMBOLS 1... Light emitting display body, 13a, 13b... Electrode, 2°2a, 2a', 2a"... Conductive wire, 3... Flexible envelope, 31... Inner translucency Flexible tube, 32...
Outer translucent flexible tube, 33...translucent flexible resin.

Claims (1)

[Claims] (1) 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 transparent, and each light-emitting element has a polarity of its electrode. are oriented so that they are aligned uniformly in the radial direction of the flexible envelope and are located approximately on the center line of the flexible envelope, and each conductive wire connecting different electrodes of adjacent light emitting elements is A bendable rod-shaped light-emitting display, characterized in that it is configured to diagonally cross the center line of the flexible envelope.