JP2524372B2 - Light emitting diode display - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a light emitting diode display device (hereinafter abbreviated as LED display device) which performs light emission display by light emission of a light emitting diode (hereinafter abbreviated as LED). .

[Prior Art] Conventional LED display devices are usually commercially available LED lamps, for example, LED semiconductor chips connected to external leads, which are sealed in a lens-shaped case that is enclosed in a case They are combined and mounted on a printed circuit board by soldering, and are arranged so as to face each of the windows for light emission provided on the exterior panel of the LED display device. When the shape and size of the light emitting surface defined by the light emitting window are arbitrary, the light emitted from the LED lamp is guided to the window and the upper surface thereof is made of a resin that constitutes the light emitting surface.
An LED lens is installed between the LED lamp and the exterior panel.

FIG. 4 shows an example of such a conventional LED display device which has four light emitting surfaces and two LED lamps are provided for each light emitting surface in order to increase the area of the light emitting surface. ing.

In FIG. 4, reference numeral 1 is an exterior panel of the LED display device, which is made of resin or the like. In this case, the exterior panel 1 is provided with four windows (openings) 1a that define the light emitting surface side by side in this case. Hooks 1b, 1b are provided on the inner surface of the exterior panel 1, and the printed circuit board 2 is held facing the exterior panel 1 via the hooks 1b, 1b.

The above-mentioned LED lamp 7 is provided at each of the positions on the printed circuit board 2 facing the respective windows 1a of the exterior panel 1.
Solder the external lead 7a to the printed circuit board 2 and
Four sets are implemented one by one.

Further, the LED lens 4 described above is provided on the LED lamp 7. The LED lens 4 is integrally molded from a transparent resin, and guides the light emitted from the four LED lamps 7 to each of the windows 1a of the exterior panel 1, and the upper end surface thereof constitutes the light emitting surface of the LED display device. It is formed in a shape in which convex portions 4a as four lens bodies are connected. Then, the LED lens 4 is fixed on the printed circuit board 2 by welding the welded parts 4b, 4b provided on the lower portions of both ends thereof to the printed circuit board 2. Each of the convex portions 4a is fitted into each of the windows 1a of the exterior panel 1.

Based on this structure, there are four LEs, two for each display.
The D lamp 7 is selectively energized and lit, and its light emission is an LED
It is guided to the upper end surface which constitutes the light emitting surface through the convex portion 4a of the lens 4 and is visually observed from the outside.

[Problems to be Solved by the Invention] However, the conventional LED display device as described above has many problems as described below.

That is, first, light emission may leak between the light emitting surfaces of the windows 1a adjacent to each other, in which case the user of the LED display device may make a mistake in the display determination.

In addition, as a matter of appearance, when two or more LED lamps 7 are used for one light emitting surface as described above, the boundary line 8 between the LED lamps can be seen in one light emitting surface. It's unsightly. Further, in this case, there is a slight difference in color and light amount of each lamp on one light emitting surface.

Next, as a problem of productivity, since the number of LED lamps 7 is large and the strength of the external leads 7a is weak,
The mounting work of the LED lamp 7 is troublesome, and it is difficult to align the height and position of the LED lamp. Further, in order to make the heights of the LED lamps uniform, a spacer or the like shown by reference numeral 9 in FIG.

As a method of solving these problems, it is conceivable to use a special-purpose lamp in which two LED lamps are integrated, but since such a lamp is expensive, using it increases the manufacturing cost. .

[Means for Solving Problems] In order to solve such problems, the light emitting diode display device according to the present invention is provided with an exterior panel having a plurality of windows for light emission arranged side by side, and facing the panel. Adjacent to the printed board on which the semiconductor chip of the light emitting diode is mounted at each of the positions facing the plurality of Sanadas, and a lens provided between the board and the exterior panel to guide the light emitted from the semiconductor chip to the window. A light-blocking wall for blocking light between the windows is provided, and the light-blocking wall is provided so as to project from the inner surface of the exterior panel, penetrates the lens, and is inserted into the printed circuit board.

[Operation] According to such a structure, the adjacent windows are completely shielded from each other through the above-mentioned light shielding wall. In addition, the boundary line of the case of the LED lamp is not visible on one light emitting surface as in the conventional case. Moreover, the mounting of the semiconductor chip of the light emitting diode on the printed circuit board can be automatically performed by wire bonding used in IC manufacturing technology.

[Examples] Hereinafter, details of examples of the present invention will be described with reference to the drawings.

1 to 3 are views for explaining the structure of an LED display device having four light emitting surfaces as an embodiment of the present invention.
FIG. 1 shows a side cross section of the entire LED display device, FIG. 2 shows a configuration on a printed circuit board, and FIG. 3 shows an inner surface of an exterior panel. However, in FIG. 3, the hook in FIG.
1b and 1b are not shown. In these figures, the parts corresponding to those in FIG. 4 of the conventional example described above are designated by the corresponding reference numerals.

In the structure shown in FIGS. 1 to 3, first, the exterior panel 1 of the LED display device is made of resin, and in this case, like the above-mentioned conventional example, four windows 1a for light emission are juxtaposed, and hooks are provided on the inner surface. 1b and 1b are projected. The printed circuit board 2 is held facing the exterior panel 1 via the hooks 1b, 1b.

Instead of the LED lamp of the conventional example, an LED semiconductor chip (hereinafter referred to as an LED chip) 3 is provided at each of the positions on the printed circuit board 2 that face each of the windows 1a of the exterior panel 1.
In this case, four sets of two are mounted. The LED chip 3 is mounted on the printed circuit board 2 by wire bonding used in IC control technology. Further, each of the four sets of LED chips 3 having different emission colors (wavelengths) can clearly display different functions.

An LED lens 4 made of a transparent synthetic resin such as ABS resin or acrylic resin is provided on the LED chip 3 on the printed circuit board 2. The LED lens 4 guides the light emitted from each of the four sets of LED chips 3 to each of the windows 1a of the exterior panel 1, and the upper end surface thereof is formed into a shape in which the convex portions 4a as the four lens body portions that constitute the light emitting surface are connected. Has been done. And
The LED lens 4 is fixed to the printed circuit board by welding the welded parts 4b, 4b provided at the lower portions of both ends to the printed circuit board 2 as in the case of the conventional example, and each of the convex parts 4a is provided on the exterior panel 1.
Are fitted in each of the windows 1a.

Further, as shown in FIG. 2, each LED is mounted on the printed circuit board 2.
A current limiting resistor 5 for guiding the drive current of the chip 3 and a connector 6 are provided.

In the present embodiment, a light shielding wall 1c that shields light between adjacent light emitting windows 1a is formed integrally with the exterior panel 1 and protrudes from the inner surface of the exterior panel 1 as a different point from the conventional one. And the light shielding wall 1c is the center 2 of the four windows 1a.
It is provided so as to surround the four sides, penetrates the LED lens 4 and is inserted into the printed circuit board 2, and the entire area between the main body part of the exterior panel 1 and the printed circuit board 2 is not gapped between the adjacent windows 1a. It is configured to block light.

For this reason, in the connecting portion between the adjacent convex portions 4a in the LED lens 4, holes 4c are formed for penetrating each of the side plates 1d on the side of the adjacent windows 1a of the light shielding wall 1c. The printed circuit board 2 also has holes 2a for inserting the side plates 1d of the light shielding wall 1c.

The height of the side plate 1d of the light shielding wall 1c is set so as to project from the inner side surface of the exterior panel 1 to the inner side surface of the printed circuit board 2. The cutout portion 1e is formed.

Through the light shielding wall 1c having such a structure, as shown in FIG. 1, the entire area between the exterior panel 1 and the printed circuit board 2 from the top to the bottom is shielded between adjacent windows 1a.

With this structure, 4 LEs, 2 for each display, are displayed.
The D chip 3 is selectively energized and lit, and its light emission is an LED
Through the convex portion 4a of the lens 4, the light emitting surface of the window 1a, that is, each convex portion 4a
Is guided to the upper end surface of the and visible from the outside.

According to the present embodiment as described above, the entire area between the exterior panel 1 and the printed circuit board 2 between the adjacent windows 1a that define the light emitting surface of the exterior panel 1 via the light shielding wall 1c as described above. Since light is shielded without a gap, mutual light emission does not leak to the light emitting surfaces of adjacent windows 1a.

Further, unlike the above-described conventional case, the boundary line between the cases of the plurality of LED lamps cannot be seen on one light emitting surface. Two LEDs for one light emitting surface
Since the light emission of the chip 3 is guided through only the LED lens 4 without passing through each case as in the conventional case, the light emission and color development on one light emitting surface becomes more uniform, and the appearance becomes more beautiful and good.

It should be noted that if the light shielding wall 1c is not inserted into the printed circuit board 2 and brought into contact with the printed circuit board 2 as in the above-described embodiment, a gap is inevitably formed between the light shield wall 1c and the printed circuit board 2 and the adjacent space is provided therebetween. The light emission of the LED chip 3 leaks to the light emitting surface of the matching window 1a. And when the LED display device is used especially in a dim room, the leaked light is clearly visible. LE on the gold-plated printed circuit board 2
When the D chip 3 is wire-bonded and mounted, the surface of the printed circuit board 2 easily reflects light due to its metal portion,
As described above, in order to bring the light shielding wall into contact with the printed circuit board 2 to completely shield light, the light shielding wall is adhered to the printed circuit board, or an elastic body such as rubber or sponge is inserted in the gap between the light shielding wall and the printed circuit board. Other means must be added. This increases the number of assembly steps and the number of parts, which increases the cost.

On the other hand, in the present embodiment, the light shielding wall 1c is inserted into the printed board 2 as described above, so that the light shielding can be completely performed by the structure which can be implemented at a low cost. Also, in this embodiment, the LED
The chip 3 can be mounted on the printed circuit board 2 at low cost by an automatic process by wire bonding as described above. Further, a spacer or the like which has been conventionally required is not necessary, and the number of parts is small as a whole, and the assembly is performed in a simple process, and the manufacturing cost can be reduced.

In this embodiment, two LED chips 3 are used for one light emitting surface, but the number of used LEDs is not limited to two, and an appropriate number may be selected according to the area and shape of the light emitting surface. By selecting and arranging the arrangement, it is possible to obtain desired brightness uniformity of the light emitting surface. Of course, the number of light emitting surfaces is not limited to four.

If the LED lens 4 is made completely transparent, it will be L when emitting light.
Since the brightness of the ED chip 3 itself is high, the brightness of the light emitting surface may change depending on the viewing angle. On the other hand, LE
If the LED lens 4 is made semitransparent by mixing a diffusion material into the resin of the D lens 4, the entire light emitting surface of the LED lens 4 emits light more uniformly
Color develops, and the appearance is beautiful and good.

[Effects of the Invention] As is apparent from the above invention, in the light emitting diode display device according to the present invention, an exterior panel having a plurality of windows for light emission arranged side by side, and a panel provided opposite to the panel and facing the plurality of windows. A printed circuit board on which a semiconductor chip of a light emitting diode is mounted at each position, a lens that is provided between the substrate and the exterior panel and guides light emitted from the semiconductor chip to the window, and between adjacent windows. Since a light shielding wall for shielding light is provided, and the light shielding wall is provided so as to project on the inner surface of the exterior panel and penetrates the lens and is inserted into the printed circuit board, the light shielding wall for adjacent light emission is used. There is no light leakage to the light emitting surface of the window, the light emitting surface emits light and color is uniform, and a beautiful good appearance is obtained.The structure is simple, the number of parts is small, and it is assembled in a simple process.
It has excellent effects such as reduction in manufacturing cost.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a structure of an LED display device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a structure on a printed board in FIG. 1, and FIG. 3 is an exterior panel in FIG. FIG. 4 is a perspective view showing the inner side surface of FIG. 4, and FIG. 4 is a side sectional view showing the structure of a conventional LED display device. 1 ... Exterior panel, 1c ... Shading wall 2 ... Printed circuit board, 3 ... LED chip 4 ... LED lens, 5 ... Resistor 6 ... Connector

Claims (2)

(57) [Claims] 1. An exterior panel in which a plurality of windows for light emission are arranged in parallel, and a printed board on which a semiconductor chip of a light emitting diode is mounted at a position facing the panel and facing each of the plurality of windows. A lens provided between the substrate and the exterior panel to guide light emitted from the semiconductor chip to the window, and a light-shielding wall for shielding light between adjacent windows, the light-shielding wall being inside the exterior panel A light emitting diode display device characterized in that the light emitting diode display is provided so as to project from a side surface, penetrate the lens, and be inserted into the printed circuit board. 2. The light emitting diode display device according to claim 1, wherein the light shielding wall is formed integrally with the exterior panel.