JP2573723Y2 - 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 in which chips are arranged in a matrix and, for example, a large number of chips are mounted on a fixed frame body and the front surface is flush with each other to form an LED display device having a large display screen.

[0002]

2. Description of the Related Art Such an LED display unit of this type is:
It has a configuration as shown in FIG. 4 showing a cutaway right side view thereof. That is, FIG. 1 shows a display section 4 having a housing (1) joined and fixed to the front surface of a matrix wiring board (2).
A divided configuration, in other words, a configuration in which four identical rectangular display blocks are arranged side by side in a square front is illustrated, and the matrix wiring board (2) is formed on the front surface thereof. For example, 6 in the wiring circuit pattern (not shown)
4 × 64 LED chips (not shown) are arranged in a matrix and bonded and mounted.
The terminal pins (3) for supplying power to the D chip are arranged in rows as shown in FIG. 2, and penetrate through the matrix wiring board (2) to be electrically connected to the wiring circuit pattern. The housing (1) is provided with a display hole (not shown) for each pixel unit of the LED, and is integrated with the front surface of the matrix wiring board (2) by means of fusion or the like.

[0003] A plurality of elongated insertion holes through which each row of terminal pins (3) are inserted are inserted into a metal heat dissipation member (4) for releasing heat generated during emission driving of each LED chip. (5) is formed at a required location, and the entire back surface of the display unit in which the housing (1) and the matrix wiring board (2) are integrated is made of heat conductive silicone rubber (6).
The terminal pins (3) protruding from the rear surface of the display unit are inserted through the insertion holes (5) so that the heat radiation member (4)
It is joined to the front of. The drive circuit board (7) on which required electronic components are mounted and the lighting control circuit of each of the LED chips is formed has a mounting portion (8) having a screw hole protruding from the rear surface of the heat radiating member (4). ) Are fixed by fixing screws (9), and the respective terminal pins (3) are connected by soldering. The terminal pin (3) allows the heat dissipating member (4) to be thermally conductive rubber (6).
And is pressed against the display unit and fixed. It should be noted that components and the like for attachment to the fixed frame are omitted in FIG.

[0004]

In the LED display unit, a drive circuit board (7) is fixed to a heat radiating member (4) by a fixing screw (9), and the heat radiating member (4) is connected to each terminal pin (3). As a result, it is pressed and fixed to the display unit with the heat conductive rubber (6) interposed therebetween. However, a large number of 64.times.64 LED chips are mounted on the matrix wiring board (2) having a relatively small area as described above, and a drive circuit board (7) for controlling the lighting of the large number of LED chips.
However, since the mounting density of electronic components is increasing year by year, it is difficult to secure a space for screwing to the heat radiating member (4).

Therefore, the screwing is eliminated, and only the pin-shaped support portion for simply contacting and supporting the four corner portions of the drive circuit board (7) is formed on the heat radiating member (4). It is conceivable to adopt a configuration in which (4) is sandwiched and fixed between the display unit and the drive circuit board (7) through each terminal pin (3). However, the heat dissipating member (4) is merely sandwiched and fixed between the display unit and the drive circuit board (7), and the insertion hole (5) of the heat dissipating member (4) is connected to the terminal pin (3). Each row of terminal pins (3) is drilled in a larger shape so as not to contact. Therefore, the drive circuit board (7) caused by the heat generated by the LED chip
The heat radiating member (4) is moved laterally, that is, each member (1), (2),
(6), (4), and (7) are displaced in an orthogonal plane direction including up, down, left, and right with respect to the front-rear direction, which is the direction in which the terminal pins (3) are in contact with the heat radiating member (4). is there.

Therefore, the present invention provides a structure in which a part of the drive circuit board is merely brought into contact with the heat radiating member, thereby increasing the mounting density of the electronic components, and reducing the lateral displacement of the heat radiating member with a simple structure. It is an object of the present invention to provide an LED display unit that can surely prevent the display.

[0007]

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 matrix wiring board in which a large number of LEDs are arranged in a matrix and attached to a wiring pattern on the front surface, and LED power supply terminal pins are projected from the rear surface in an array state. A synthetic resin housing in which a display hole is provided to be opposed to the front surface of the matrix wiring board and is attached to the front surface of the matrix wiring board, and a heat radiating member closely inserted over the entire rear surface of the matrix wiring board through the terminal pins. ,
And a drive circuit board disposed on the rear side of the heat dissipating member and having the ends of the terminal pins connected and fixed, wherein a plurality of pin-shaped projections are integrally formed on the rear surface of the housing. Projecting, forming an insertion hole for each of the projections in the matrix wiring board, and fusing a predetermined number of the ends of the projections to the back surface of the matrix wiring board to form the housing and the matrix wiring board. A plurality of positioning recesses into which the ends of the unfused projections are fitted, respectively, on the front surface of the heat radiating plate, and a supporting portion for abutting the drive circuit board on the back surface. It is characterized by being formed.

[0008]

The drive circuit board is only partially contacted with the supporting portion of the heat dissipating member in order to increase the mounting density of electronic components, but is fixed by a large number of soldered terminal pins. . The heat dissipating member is sandwiched between the display unit and the drive circuit board through the terminal pins, and is positioned in the front-rear direction. The member is not displaced by vibration or the like. Also, when the terminal pins and the drive circuit board are stretched and deformed due to the heat generated by the LEDs, the protrusions formed integrally with the housing made of synthetic resin,
Due to its own elastic force, it does not come out of the recess following the dimensional change in the front-rear direction. Therefore, the displacement of the heat radiating member in the horizontal direction can be reliably prevented while the heat radiating member and the drive circuit board are fixed only by each terminal pin.

[0009]

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 a partially cutaway right side view of an embodiment of the present invention, FIG. 2 is a perspective view of a display block as a component of a display unit of the above, and FIG. 3 is a partial perspective view of a heat dissipation member of the same. In these figures, the same parts as those in FIG. 4 are denoted by the same reference numerals, and in order to facilitate understanding, the present invention has a structure for mounting on a fixed frame. The parts not directly related to the gist of the above are omitted. The display unit is configured by combining four identical display blocks each having a square frontal shape as shown in FIG. 2 in a square shape.
On the front surface of a matrix wiring board (12) on which chips are arranged in a matrix and mounted, a synthetic resin housing (11) in which display holes are opposed to each other for each pixel by LED is fixedly joined. Wiring board (12)
The configuration in which the terminal pin (13) protrudes from the back of the device is the same as the existing one, but the difference is that
A plurality of housings (11) projecting from appropriate positions on the back of the housing (in the embodiment, seven display blocks and 28 display units in total)
The pin-shaped projection (18) is integrally formed, and an insertion hole (19) for each projection (18) is formed in the matrix wiring board (12).
8) An end of a predetermined one is fused (A) to the back surface of the matrix wiring board (12) to form a housing (11).
And the matrix wiring board (12) are integrated. In this embodiment, as shown in FIG. 2, a total of five projections (18) arranged at the four corners and the center of each display block are fused (A) to form a housing (11) and matrix wiring. A case is shown in which two unfused projections (18) above and below the central portion are used for positioning the heat dissipating member (14), which is for fixing to the plate (12).

As shown in FIG. 3, an elongated hole for allowing each terminal pin (13) group to pass through a metal heat radiating member (14) for releasing heat generated when each LED chip emits light. Is the same as the existing one only in a configuration in which a plurality of insertion holes (15) are formed at required positions, but the above-mentioned unfused portions are provided at upper and lower positions between each two adjacent insertion holes (15). A positioning recess (20) into which the positioning projection (18) for fitting is fitted is formed, and a support portion (21) is integrally provided from four corner portions on the back surface.

The display block shown in FIG. 2 is joined to the portion shown by the one-dot chain line in FIG. 3 via the heat conductive rubber (6). At this time, each terminal pin (13) group is inserted into each insertion hole (15), and the unfused positioning projection (18) fits into the positioning recess (20).
The positioning projection (18) and the positioning recess (20)
Accordingly, there is an advantage that, in addition to preventing the heat dissipating member (14) to be described later from being displaced in the lateral direction, the four display blocks can be used for mutual positioning when the four display blocks are attached to the heat dissipating member (14). The drive circuit board (7) has heat dissipation members (14) at the four corners.
The terminal pins (13) are soldered in contact with the support portions (21). Therefore, the mounting density of the electronic components on the drive circuit board (7) can be significantly increased as compared with the case of screwing.

The drive circuit board (7) is fixed in contact with the support (21) by a large number of soldered terminal pins (7). The heat dissipating member (14) is sandwiched between the display unit and the drive circuit board (7) through the terminal pins (13), is positioned in the front-rear direction, and is fitted in the positioning recess (20). Since the positioning projections (18) prevent displacement in the front-rear, left-right and lateral directions, they do not shift due to vibration or the like. Further, the projection (18) integrally formed with the housing (12) made of synthetic resin is provided with a terminal pin (1) caused by heat generated by the LED.
3) and the extension and deformation of the drive circuit board (7) follow the dimensional change in the front-rear direction by its own elastic force.
No escape from 0). Therefore, while the heat radiating member (14) and the drive circuit board (7) are fixed only by each terminal pin (13), the heat radiating member (1) is fixed.
4) The displacement in the lateral direction can be reliably prevented.

[0013]

As described above, according to the LED display unit of the present invention, the mounting density of the electronic components of the drive circuit board is increased by simply bringing a part of the drive circuit board into contact with the supporting portion of the heat radiating member. While the heat dissipation member and the drive circuit board are positioned and fixed in the front-rear direction by the terminal pins, the matrix wiring board is inserted through the pin-shaped projections that are integrally protruded from the back of the synthetic resin housing. The configuration in which the heat sink is fitted into the positioning recess of the heat sink makes it possible to reliably prevent the heat dissipating member from being displaced in the horizontal direction against elongation deformation, vibration, and the like of the drive circuit board and terminal pins due to heat generated by the LEDs. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway right side view of an embodiment of the present invention.

FIG. 2 is a perspective view of a part of the display unit according to the first embodiment.

FIG. 3 is a perspective view of a part of the heat dissipation member.

FIG. 4 is a partially cutaway right side view of a conventional unit.

[Explanation of symbols]

 Reference Signs List 7 drive circuit board 11 housing 12 matrix wiring board 13 terminal pin 14 heat dissipation member 18 pin-shaped protrusion 19 insertion hole 20 positioning recess

Claims (1)

(57) [Scope of request for utility model registration] 1. A matrix wiring board in which a large number of LEDs are arranged in a matrix and attached to a wiring pattern on a front surface, and a terminal pin for LED power supply is projected from a rear surface in an array state, and one pixel by the LEDs A display housing is provided for each unit, and a synthetic resin housing is attached to the front surface of the matrix wiring board in a bonded state, and the terminal pins are inserted through the housing to closely contact the entire back surface of the matrix wiring board. In an LED display unit comprising a heat dissipating member, and a drive circuit board disposed on the rear side of the heat dissipating member and having an end of each of the terminal pins connected and fixed, a plurality of pins are provided on the rear surface of the housing. Projections are integrally formed, and insertion holes for the respective projections are formed in the matrix wiring board, and a predetermined number of ends of the projections are connected to the mat. The housing and the matrix wiring board are integrated by fusing to the back of the Rix wiring board,
A plurality of positioning recesses into which the ends of the unfused protrusions are respectively fitted are formed on the front surface of the heat radiating plate, and a supporting portion for contacting the drive circuit board is formed on the back surface. Characterized LED display unit.