JP2573722Y2 - LED display unit - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an LED which is used as a display pixel.
The present invention relates to an LED display unit which constitutes an LED display device having a large display screen by arranging a plurality of chips on a fixed frame and arranging the chips in a matrix.

[0002]

2. Description of the Related Art Such an LED display unit of this type is:
It has a structure as shown in FIG. 4 showing an exploded perspective view thereof and FIG. 5 showing a cut plan view. That is, the display unit (1), the cooling flat plate unit (2), the mounting member (3), and the drive circuit board (4) are sequentially arranged from the front side (the left side in FIG. 4) and united integrally. The display unit (1) has a configuration in which four identical rectangular display blocks are arranged side by side, and each display block has
It is composed of a dot plate (5), an LED wiring board (6) and a heat conductive silicon rubber (7),
On the wiring board (6), for example, 16 × 16 LED chips (not shown) are arranged in a matrix and bonded and mounted on the wiring circuit pattern on the front surface of the wiring board (6). Terminal pins (8)
Are arranged in two rows and penetrate the LED wiring board (6) and are electrically connected to the wiring circuit pattern. The dot plate (5) is provided with a display hole (9) facing each LED chip, and is attached to the front surface of the LED wiring board (6). The heat conductive rubber (7) is attached to the back surface of the LED wiring board (6) through the terminal pins (8).

The cooling flat portion (2) is formed of a metal plate such as an aluminum plate, for example, and has a display portion (1).
Each row of four sets of terminal pins (8) protruding from the back of
Eight slot-like insertion holes (10) through which groups are inserted respectively
Are drilled at required places, female screw portions (11) are projected at the four corners on the rear surface, and a heat sink (1
9) A mounting screw hole (12) is formed. Also,
The mounting member (3) is integrally formed of a synthetic resin, is provided with eight insertion holes (14) at required locations in the same manner as the cooling flat plate portion (2), and is provided with a heat radiating plate (19) at the center. Holes (15) are drilled, and fitting cylinders (16) of the above-mentioned female screw portions (11) are protruded at the four corners on the rear surface. An attachment leg (17) having a claw protrudes.

Then, the female thread portion (11) is connected to the fitting cylindrical portion (1).
6), and the fixing screw (20) is screwed into the female screw portion (11) from the rear to thereby form the cooling flat plate portion (2).
The drive circuit board (4) on which the electronic components are mounted is fixed to the mounting member (3) and is in contact with the mounting member (3), and also the cooling flat plate portion (2) and the mounting member. A terminal pin (8) inserted through each of the insertion holes (10) and (14) of (3) is fixed by soldering, and the display unit (1) and the drive circuit board are connected via the terminal pin (8). (4) The cooling flat part (2)
The mounting member (3) is clamped and fixed. Also, L
The distal end of the radiating plate (19) having a V-shape is formed with the insertion holes (18),
(15) and the screw hole (12) of the fixing screw (20)
To the cooling flat plate portion (2).

In the LED display unit integrated as described above, the fitting claws at the tips of the four mounting legs (17) are engaged with the engaging portions (22) of the lattice-shaped fixing frame (21). ), And a large number of LED display units of the same shape are mounted on the fixed frame body (21) with their front surfaces arranged side by side and flush. The device is configured.

[0006]

As described above, in this kind of LED display unit, since the same one is arranged vertically and horizontally to constitute a large display screen, the heat radiation member cannot be arranged on the side. It extends rearward. However, in the above-mentioned LED display unit, the heat dissipating member is the display unit (1).
A fixing screw (2) comprising a cooling flat plate portion (2) which is in close contact with the rear surface of the display portion (1) for storing heat generated during light emission driving of the display portion (1), and a radiator plate (19) for conducting heat backward. 2
0), and the heat radiating plate (19) is inserted through the insertion holes (18) and (15) of the drive circuit board (4) and the mounting member (3), and the cooling flat plate ( 92), the drive circuit board (4) cannot take up much space for forming the insertion hole (18) due to the high mounting density of electronic components. Therefore, the width of the heat radiating plate (19) cannot be increased, and the contact area between the heat radiating plate (19) and the cooling flat portion (2) is small.

Also, two members, a cooling flat plate portion (2) and a heat radiating plate (19), are required as a heat radiating member, and in addition, a mounting member (3) and a fixing screw (20) for connecting these members to each other. Is required, and the cost is high because of the large number of parts. Moreover, since many parts are stacked and integrated, the depth dimension is increased, and the fitting claw of the mounting leg (17) is attached to the fixed frame at the rear end.
There is a concern that the load on the front side of the mounting means hanging on 1) becomes large, and the mounting means may come off due to vibration or the like and fall off forward.

Accordingly, the present invention has a technical problem to provide an LED display unit which has excellent heat dissipation performance, achieves a reduction in the number of parts and a reduction in the depth dimension, thereby achieving a cost reduction and a reduction in size and weight. It is assumed that.

[0009]

According to the present invention, as a technical means for achieving the above-mentioned object, an LED display unit is constituted as follows. That is, a display section in which a large number of LEDs are arranged in a matrix, a heat dissipating member disposed in close contact with the back side of the display section to conduct heat generated by the LEDs to the rear, and penetrating through the heat dissipating member. An LED driving circuit board electrically connected to each of the LEDs by the connecting pins, and an attachment member protruding rearward from the driving circuit board and fitted to a fixed frame body. A heat radiating member, a cooling flat plate portion closely contacting the display portion, and a heat radiating plate portion extending from a side of the cooling flat plate portion and protruding rearward through a vicinity of an end of the drive circuit board, are formed of metal. The base end portions of the plurality of mounting members, which are formed integrally by bending a plate and have a fitting claw at the distal end portion made of synthetic resin, are integrally formed on the back surface of the cooling flat plate portion. Combined by It is configured as characterized in that is.

[0010]

Since the heat radiating member is formed by integrally forming the heat radiating plate portion by bending the side of the heat radiating member to the cooling flat plate portion which is in close contact with the display portion, the efficiency is reduced from the cooling flat plate portion to the heat radiating plate portion. Since the heat is well conducted and the pair of radiator plates protrude rearward through the vicinity of the end without inserting the drive circuit board, the width of the radiator plate should be as large as possible. And extremely excellent heat dissipation performance can be obtained.

Further, the cooling flat plate portion, the heat radiating plate portion, and the mounting member are formed as an integral component, and a fixing screw for connecting these components to each other is not required, so that the number of components can be reduced and the cost can be reduced. At the same time, the depth dimension is reduced along with the reduction in the number of components, and stable mounting is possible.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a right side view of the same. In these figures, the same as or equivalent to FIGS. Are attached. And
The difference from the existing unit is that the cooling plate (2), the mounting member (3), and the heat radiating plate (19) in the existing unit are replaced with a structure in which the cooling plate (19) is integrated with the fixing screw (20). ) Is formed by bending a rectangular cooling flat plate portion (24) that is in close contact with the back surface of the display unit (1), and by bending a central portion of two rectangular opposite sides of the cooling flat plate portion (24). A radiating plate portion (25) projecting rearward through the vicinity of the end of the substrate (4) is formed integrally by bending a single metal plate such as an aluminum plate, and a fitting claw is provided at the tip end. Four mounting members (26) made of synthetic resin having a shape provided with (27), and their base end portions are positioned on both sides of each heat radiating plate portion (25) on the back surface of the cooling flat plate portion (2). That is, the cooling flat part (2)
Is provided at the four corners on the back surface of the device by integral molding. Each of the mounting members (26) is shown in FIG.
As shown in (1), the projections (28) projecting from the four corners on the rear surface of the cooling flat plate (2) are integrated with the heat radiation member (23) by insert molding.
The cooling flat plate portion (24) is provided with eight elongated holes (29) similar to the existing cooling flat plate portion. The entire back surface of the display unit (1) is joined to the cooling flat plate part (24) by inserting the connecting pins (8), and each end of each connecting pin (8) is connected to the cooling plate (24) in FIG. And as shown in FIG. 3, it is connected and fixed to the drive circuit board (4) which is in contact with the supporting step (30) formed on the mounting member (26) by soldering. In addition, both heat radiating plates (25)
Are bent at the intermediate portions, respectively, so that the mounting members (2
6), the mounting hole (31) is formed in the tip portion. In addition, the drive circuit board (4)
In this case, it is not necessary to form a through hole for a heat sink provided in an existing unit, and electronic components can be mounted at a higher density.

Therefore, the heat dissipating member (23) has a structure in which the cooling heat dissipating portion (25) is formed integrally with the cooling flat plate portion (24) which is in close contact with the display portion (1) by bending the side thereof. Therefore, the heat is efficiently conducted from the cooling flat plate portion (24) to the heat radiating plate portion (25), and the width of the pair of heat radiating plate portions (25) is reduced because the driving circuit board (4) is not inserted through the heat radiating plate portion (25). Can be made as large as possible, whereby extremely excellent heat dissipation performance can be obtained.

Further, the cooling flat plate portion (24), the heat radiating plate portion (25) and the mounting member (26) are integrated, and a fixing screw for connecting these components to each other is not required, so that the number of parts is reduced. As a result, considerable cost reduction can be achieved, and the size and weight are reduced due to the reduction in the number of parts. In particular, the depth dimension is reduced by the thickness of the mounting member separately provided in the existing unit. 27) can be stably held without falling off against vibration or the like irrespective of the attaching means which is engaged with the engaging portion (22) of the fixed frame (21).

[0015]

As described above, according to the LED display unit of the present invention, the cooling flat plate portion and the heat radiating plate portion that are in close contact with the back of the display unit are integrated, and the heat radiating plate portion is attached to the drive circuit board. Since it is not inserted, the width can be made as large as possible, so that extremely good heat radiation performance can be obtained.

Further, since the cooling flat plate portion, the heat radiating plate portion, and the mounting member are integrated, and a fixing screw for connecting these components to each other is not required, the number of components is reduced, and the number of components is reduced. Can be achieved, and the depth dimension can be reduced and the size and weight can be reduced. Therefore, it is possible to stably hold against vibrations and the like despite the fact that it is attached by the hooking means using the fitting claws.

In addition, the heat radiating member includes a cooling flat plate portion closely contacting the display portion, a heat radiating plate portion extending from a side of the cooling flat plate portion and protruding rearward through a vicinity of an end of the drive circuit board. Are integrally formed, the drive circuit board does not need to form the through holes of the heat sink provided in the existing unit, and has a great advantage that electronic components can be mounted at a higher density.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a right side view of the same.

FIG. 4 is an exploded perspective view of a conventional example.

FIG. 5 is a cut-away plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display part 4 Drive circuit board 8 Connection pin 23 Heat radiating member 24 Flat plate part for cooling 25 Heat radiating plate part 26 Mounting member 27 Fitting claw

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G09F 9/33 G09F 9/00 304

Claims (1)

(57) [Scope of request for utility model registration] 1. A display unit in which a large number of LEDs are arranged in a matrix, a heat dissipating member disposed in close contact with a back side of the display unit and conducting heat generated by the LEDs backward,
An LED including an LED driving circuit board electrically connected to each LED by a connecting pin penetrating the heat radiating member, and an attachment member protruding rearward from the driving circuit board and fitted to a fixed frame body. In the display unit, the heat radiating member is a cooling flat plate portion closely contacting the display portion, and a heat radiating plate extending from a side of the cooling flat plate portion and protruding rearward through a vicinity of an end of the driving circuit board. Parts are integrally formed by bending a metal plate, and the base end portions of the plurality of mounting members formed into a shape having fitting claws at the distal end portion by a synthetic resin are formed by the cooling flat plate portion. An LED display unit characterized in that the LED display unit is integrally formed on a back surface of the display device.