JP3480594B2 - Collective LED lamp - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to three different colors, especially RGB.
The present invention relates to a collective LED lamp including at least one LED each having three colors, and more particularly to a collective LED lamp used in a display module used outdoors.

[0002]

2. Description of the Related Art Conventionally, it is difficult to form an LED that emits RGB light from a single LED lamp. Therefore, LEDs of each color are collectively arranged and configured as one lamp. Note)) is configured. Since a full-color display is possible by assembling each RGB color, a brighter blue LED is needed for this mixed lamp to improve the color mixture, and most recently, a high-brightness type gallium nitride (GaN) blue LED was manufactured. Since it is also reported, it is possible to use a blue light emitting diode (LED) made of gallium nitride (GaN) semiconductor.

Since the collective lamp is formed by arranging a plurality of small LEDs, it has a relatively large structure and is often used for a large display panel or the like, and is often used outdoors. In that case, the display of the collective lamp used for the display panel may be difficult to see due to the brightness of sunlight during the day when it is normally used. This is the same phenomenon that a traffic signal becomes difficult to see by irradiation of sunlight, which is a factor that hinders the purpose of improving display or visibility. for that reason,
Like a traffic signal, a hood that blocks outside light is installed above the lamp. This hood is often a part of the case of a collective lamp, and the structure is such that the light emitting part is exposed for efficient use of LEDs. For this reason, the board on which the LED is placed cannot be housed inside the case, so the board is fitted and the LED lead side is embedded with waterproof resin. Also,
The LED current may be set near the upper limit in order to make it brighter.

[0004]

Although the collective lamp is usually used outdoors, it is not always outdoors, and it is not always installed in a place exposed to sunlight even outdoors. In some cases, the hood is unnecessary. However, in the conventional configuration, the hood is integrated,
Even if it becomes unnecessary, it cannot be easily removed, and on the contrary, the visibility of the display may be obstructed indoors. Also LE
The lead side of D is embedded with waterproof resin for waterproofing and protection, but in the process of manufacturing this structure, the substrate is fixed and the waterproof resin is potted. At that time, the fixing of the board becomes indefinite, the light distribution characteristics vary, and not only the potting resin leaks into the case and the resin surface is not uniform, but the waterproof function may not be sufficient, and the quality may deteriorate. There was a problem. Further attach to the board
When soldering LEDs, the position is unstable when each LED is inserted into the through hole of the board, and when mounting by soldering, the mounting angles vary and the visibility of the collective lamp is increased. There is also a problem that will be affected.

Therefore, it is an object of the present invention to provide a collective lamp having improved visibility, more uniform waterproof property, and less restrictions in use.

[0006]

In order to solve the above-mentioned problems, the structure of the present invention is an assembly having one of the three primary colors of RGB and arranging at least one LED of each color on a supporting substrate to form one display module. in type LED lamp, wherein
The LED support substrate is inside the case of the collective LED lamp
It is supported by a stepped part, and is supported by the inner stepped part of the case and the case.
Bottom of the hood end of the assembled LED lamp that is fixed by fitting
The LED and the support base in a state of being sandwiched between the LED and the support surface.
The gap between the plates is filled with a waterproof resin, and the support substrate and LE are
It has a structure in which the lead portion of D is sealed and fixed with the waterproof resin, and at least a constant current diode is connected in series to the energizing circuit of the blue GaN-LED.

According to another aspect of the invention , the LEDs are arranged in a matrix on a support substrate, and when the LEDs are mounted on the support substrate, the two lead terminals of the LEDs are arranged in the vertical direction of the matrix arrangement of the LEDs. or it characterized that it is a direction inclined from the horizontal direction. The tilt direction is preferably about 45 degrees with respect to the vertical or horizontal direction of the matrix array.

[0008]

[Function] The hood for external light protection, which is often mounted around the case where the LED lamp is mounted, especially on the upper side, is replaceable, and the hood shape varies depending on the usage of the collective lamp. Can be In addition, the assembly of this hood itself serves to fix the LED board to the case, prevents the potting material from leaking, and suppresses the unevenness of the resin surface by potting the waterproof resin.
When LEDs are mounted in the same direction with the leads arranged in the same direction, especially in the direction tilted from the vertical and horizontal directions of the board, the light distribution characteristics spread in the direction perpendicular to the lead arrangement direction, so the overall light distribution characteristics also differ from those of the collective lamp. Spread in a direction that is tilted from the vertical and horizontal directions.

[0009]

As described above, according to the constitution of the present invention,
It is possible to provide an easy-to-use collective lamp with high versatility and guaranteed waterproof performance, and since there is a high degree of freedom to strongly distribute light in a specific direction, it is possible to improve visibility in a specific direction according to the purpose.

[0010]

EXAMPLES The present invention will be described below based on specific examples. As an example of the collective lamp 1 of the present invention, FIG. 1 shows a configuration sectional view in the case where there is a hood as an outdoor hood only on the upper surface side of the lamp. Fig. 1 (a) is its vertical section, and Fig. 1 (b)
Shows the AA cross section on the display surface shown in
The lamp hood 3 is fixed by being fitted into the case body 4 of the collective lamp. L shown here
On the ED board 2, 5 × 5 LEDs are arrayed. As can be seen from the cross-sectional view, the leads of the LEDs 10 are arranged on the board 2 in an orderly manner, and through holes (not shown) provided on the board 2 allow the back side of the board Is soldered to the wiring part. Then, an electric wire (not shown) is connected from the electric wire take-out hole 6 to an external control circuit or the like, and energization control / instruction is performed.

A lamp fixing tool 7 for temporarily fixing the collective lamp 1 to a display panel or the like is mounted on the back side of the case body 4. Also, the panels are usually made waterproof by using packing 8 or the like. Further, a groove is formed on the outer peripheral portion of the case so that a part of the case serves as the heat radiation fin 5.

The lamp hood 3 has a claw portion 31 at the fitting portion.
Is formed and fitted into the fixing hinge portion 41 on the case side, and the LED substrate 2 is fixed to the stepped portion of the case 4 at the end surface of the lamp hood 3. After that, in the gap between the rows of LEDs 10,
It is potted with silicone resin or other waterproof resin 9 to prevent moisture from entering the LED lead parts. This potting is L
The waterproof resin is injected into the gap between the EDs. At that time, since the substrate 2 is properly fixed by the hood 3, the resin does not leak and the resin is not insufficiently filled. Therefore, the resin surface is always constant and properly waterproofed.

Since the lamp hood 3 for fixing the LED substrate 2 is of a fitting type, any shape can be selected as the hood shape, as shown in FIGS. 2 (a) to 2 (c). The hood can be shaped according to the purpose of use, expanding the range of applications. FIG. 2 (a) is an external view of the shape shown in FIG. 1. For example, in the case where it is installed in a place where external light constantly strikes from the right side of the collective lamp,
The visibility of the collective lamp can be improved by making the hood into a shape with an expanded cover as shown in Fig. 2 (b). That is, the shape is characterized in that the inset type hood (lamp hood) at the front of the display module has a cover portion that blocks external light from the right or left direction.

The inner surface of the hood may be surface-treated so that the LED light is not reflected and reflected. In other words, a hood having a textured surface is used.

Or, when it is installed indoors or the like in a place where there is no external light, it is a lamp hood without a hood, that is, L so that it can be viewed from any direction.
The shape that should be called an ED board fixing cap is sufficient. That is, the inset type hood (lamp hood) at the front of the display module is characterized by having no surrounding cover. In this way, the case body on the LED fixed side can be used in any usage mode, and is a highly versatile collective lamp.

This collective lamp 1 is an array of 5 × 5 RGB three-color LEDs, but there is color visibility due to the difference in the brightness of each color LED, and in particular the appearance of white, which is a mixture of three colors. Affects visibility. Especially when a blue LED with low brightness is used, the arrangement causes a difference in the minimum distance at which white is visible, which affects the display capability of the display panel.
Therefore, by arranging each color LED array as shown in Fig. 3,
It can be recognized as white at the shortest distance. In Figure 3 (a), red LED5
The feature is that 12 blue LEDs are used for 8 green LEDs and 8 green LEDs, and each color is dispersed and arranged as shown in the figure. In the arrangement of FIG. 3 (b), 4 red LEDs, Green LED 9
There are 12 blue LEDs. The reason why the blue LEDs are used a lot is that the blue LEDs are of a type having a low brightness, and for those having other brightness, another array is effective. Also, even though the blue LED is not a pure blue color, the blue LED is used in a large amount in order to increase the blue component. On the contrary, as shown in FIG. 3 (c), when a blue LED having brightness is used, the number of blue LEDs may be reduced and the number of green LEDs may be increased.

As described above, when a large number of blue LEDs are used, the blue LEDs are connected in parallel to secure the brightness of the blue LEDs, and the circuit shown in FIG. 4 is obtained. That is, 5 red LEDs are connected in series to the red (R) terminal and green LE to the green (G) terminal.
Two D circuits connected in series are connected in parallel.
Two blue LEDs are connected in parallel to each other at the blue (B) terminal in parallel with each other. Here, since the blue LEDs have different drive currents, the CRD (Current Regulator Diode) that keeps the drive current constant in order to make the brightness of each blue LED uniform.
May be used. That is, a constant current diode may be connected in series to at least the blue LED energizing circuit among the LED energizing circuits. With such a configuration, the variation in the color of the blue LED is eliminated, and not only the visibility is improved, but also for the display panel that collects and forms the collective lamps, the collective lamp drive control is simplified, and the device is made compact. Will be implemented.

A radiation fin 5 is provided at the rear of the case body 4.
In order to secure the brightness of the blue GaN-LED, the energizing current used tends to be large, so the collective lamp itself may generate heat, which may limit its use. The configuration was taken due to some problems,
If there is no problem in practical use, it is not a configuration with heat radiation fins,
It goes without saying that the structure may be such that only the space is ventilated.

A printed circuit board of glass epoxy or the like (for example, CEM-3) is used as a circuit board on which the LEDs of the collective lamp are arranged. When soldering an LED to a board, most of the time, solder reflow is used to immerse the solder side of the board in molten solder, and the LED is in a free state until the solder is fixed. Due to mechanical vibration or the like, the mounting direction varies. Since the variation is statistical, the light distribution characteristics of the collective lamp show a constant tendency on average and vary in the direction perpendicular to the LED lead arrangement direction. Therefore, for visibility, not only the front of the lamp but also the effect of spreading due to this variation, so if all the LED leads are aligned and tilted from the vertical and horizontal directions of the board to tilt its light distribution characteristics, The lamp can improve the visibility in a specific direction. Specifically, as shown in Fig. 5 (a) or (b), the arrangement of the through holes (k line direction) into which the leads of the LED board are inserted is tilted from the vertical and horizontal directions of the board (about 45 degrees in Fig. 5). ), The light distribution characteristics shown in FIG. 5 (c) spread in the direction perpendicular to the arrangement of the through holes (line direction of p). By changing the inclination of the spread of the light distribution characteristic in the x direction and the y direction, it is possible to obtain the light distribution characteristic suitable for the purpose of use. Note that Fig. 5 (a) shows through holes (small circles with hatches in the figure) for soldering the wires to be connected to the LED board 2, arranged on one side of the board 2, and Fig. 5 (b) arranged on both sides. It is an example.

As the LED to be used, a bullet type of φ3 mm is used here, but in this LED, the lead terminal interval is 2.5 mm and the wiring pattern becomes fine.
In the past, there were many cases of φ5 mm, and the wiring pattern was not so problematic, or there was a situation in which further integration was not possible. Therefore, in the case of the fine structure as in the present invention, the wiring layout should be considered. Although the arrangement of the LEDs is required, the arrangement in which the arrangements are aligned and inclined as shown in FIG. 5 has an advantage that the arrangement is easy as the pattern spacing.

In order to mass-produce such an LED substrate 2, a large substrate is usually processed and formed. Figure 6
The configuration diagram of the large-sized substrate 60 for board shifting shown in (a) is an example thereof, and shows a configuration in which 16 LED substrates 2 can be taken from one large-sized substrate 60. In FIG. 6, the through holes of the LED board 2 are omitted. The specifications required for the LED board 2 are that the LED board 2 is formed so as to fit snugly into the collective lamp case body 4, and the land portion of the printed wiring to be soldered is formed without any abnormality. The size of this large substrate 60
It is determined by the punched part 61 and the notch 64 for separation. Of these, the punched part has dimensional accuracy, so in order to obtain the accuracy required for assembly, the corner 63 of the LED board 2 is rounded. The cut portion 64 has a chamfered corner.

The cut portion 64 of the LED board 2 is shown in FIG. 6 (b).
As shown in, make a notch of about 45 degrees from the top and bottom of the board 60 up to the middle of the board, mount the LED on the large board and solder it, and attach the wire (not shown) with the terminal to the LED board 2 Solder to each wire through hole, and bend and separate each LED board 2 at the final stage. The wire through hole is L
If the land part is provided on the solder side of the ED, the holes may be blocked when soldering the LED.Therefore, do not provide it on the solder side of the LED, but only on the opposite side. It is desirable that the configuration is provided. Also, the soldering of this wire is performed after the LED soldering process.

Further, as shown in FIG. 1, when the LED leads 71 are passed through the LED substrate 2, the LED 10 is attached to the substrate 2.
Therefore, the lead portions immediately below the shell portion need to be arranged so as to extend on the substrate 2. Therefore, in order to prevent the LED 10 from sticking to the substrate 2, the lead 71 is subjected to lead form processing as shown in FIGS. 7 (a) (front view) and 7 (b) (side view). When inserting it into the through hole, make sure that it does not enter the root of the LED 10 shell. Alternatively, as shown in FIG. 7 (c), the punched shape of the lead 71 may be provided with a stopper portion 72.

(Second Embodiment) Various arrangement patterns are conceivable as the usage form of this collective lamp, but the most common one is a matrix-shaped arrangement as shown in FIG. It is what constitutes. It can also be used as a large segment display device as shown in FIG. 8 (b). Further, the shape is not limited to a specific shape, and may be a necessary arrangement pattern, for example, an arrangement such as a circle in FIG. 8 (c).

(Third Embodiment) Although the matrix arrangement shown in FIG. 8 (a) is formed by arranging one collective lamp in a matrix, FIG. 9 (a) also arranges a large number of collective lamps in a matrix. It is the module 90 which did. In this Figure 9,
One collective lamp is shown with 3 × 3 LEDs, but 5
The same applies to x5 or nxn. This module 9
0 is a display unit in which 16 collective lamps are arranged vertically and horizontally, and one collective LED lamp is 1 dot. In other words, module 9 that displays 16x16 dot characters
It is 0. As shown in the sectional view of the structure of FIG. 9 (b), the module 90 has a structure in which the case of the collective lamp is just integrated, unlike the collective state of FIG. 8 (a).
That is, the LED board 91 is one module board 91 common to 16 × 16 lamps. As shown schematically in part in FIG. 10, the substrate 91 is also arranged such that the LED leads are inclined from the vertical and horizontal directions of the substrate 91 (line of k), and the light distribution characteristics of the LEDs are aligned. Therefore module 9
The characteristics of 0 as a whole are similar to the light distribution characteristics of one unit (collective lamp). This module 90 also has two LED leads arranged in a tilted manner, so there is a high degree of freedom in selecting the light distribution characteristics at the design stage.

In the claims, the direction in which the two lead terminals of the LED are arranged means that the lead terminals of an ordinary shell-type LED extend in parallel with each other, and the direction of the surface formed by these two leads, Alternatively, as shown in FIG. 5, the extension that connects the rows of through holes on the substrate through which the leads pass is the direction, and the vertical or horizontal direction of the LED matrix array means the edge of the substrate shown in FIG. Direction (left and right and up and down in the figure, the xy coordinate axis direction in FIG. 5 (c)).

As described above, the structure of the present invention makes it possible to obtain a collective LED lamp with improved visibility.

[Brief description of drawings]

FIG. 1 is a vertical sectional view and a front view of a collective LED lamp of the present invention.

FIG. 2 is an external view showing an example of a lamp hood shape.

FIG. 3 is an LED array diagram of a collective LED lamp.

[Figure 4] LED circuit diagram of the collective LED lamp.

FIG. 5 is an explanatory view of a substrate (single unit) of the collective LED lamp and a light distribution characteristic of the collective lamp using the same.

FIG. 6 is an explanatory view of a substrate (for substrate removal) of the collective LED lamp.

FIG. 7 is an external view of an LED.

FIG. 8 is an explanatory diagram showing an arrangement example of a collective LED lamp.

FIG. 9 is a schematic configuration diagram of a concrete collective LED lamp module having a matrix arrangement.

10 is a schematic configuration diagram of a substrate used for the module of FIG.

[Explanation of symbols] 1 Collective lamp (collective LED lamp) 2 LED board 3 lamp hood 4 case body 5 radiating fins 6 Electric wire take-out hole 7 Lamp fixing jig (or bolt) 8 packing 9 Waterproof resin (potting resin) 10 LEDs (RGB) 11 CRD 31 Lamp Hood Claw 41 Hinge part of the case body 60 large substrate 61 Board punching part 62 C chamfer 63 R 64 notch 71 lead 72 Stopper part 90 Assembly module 91 Module board

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-226788 (JP, A) JP-A-64-45195 (JP, A) JP-A-48-100352 (JP, A) JP-A-5- 37026 (JP, A) JP 52-45565 (JP, A) JP 5-249918 (JP, A) Actual opening 62-63787 (JP, U) Actual opening 2-8068 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01L 33/00

Claims (3)

(57) [Claims] 1. A collective LED lamp having RGB three primary colors and at least one LED for each color arranged on a supporting substrate to form one display unit, wherein the supporting substrate of the LED is a collective LED lamp case. of
The case is supported by the inner step, and the case and the case are supported.
The end of the hood of a collective LED lamp that is fixed in place
The LED and the support are sandwiched between the LED and the support.
The gap between the holding substrates is filled with a waterproof resin, and the supporting substrate and
LED leads are sealed with the waterproof resin and fixed
And a constant current diode connected in series to the current-carrying circuit of the blue GaN-LED.
D lamp. 2. A is a matrix arranged in the LED supporting substrate, in the arrangement of the mounting of the LED with respect to the support substrate, the arrangement direction of the two lead terminals of the LED, said LE
Aggregate type LED lamp according to claim 1, characterized in that it is a direction inclined from the longitudinal direction or transverse direction of the D matrix array. 3. The collective LED lamp according to claim 2, wherein the inclined direction is about 45 degrees with respect to a vertical direction or a horizontal direction of the matrix array.