JPH0555181U - Dot matrix light emitting display module - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a dot matrix light emitting display module capable of efficiently releasing heat generated by the dot matrix light emitting display 3 into the outside air. [Structure] A dot-matrix light-emitting display body 3 in which n × n light-emitting dots 2 are formed vertically and horizontally on the front surface side and a back surface of the light-emitting display body 3 are substantially adhered and fixed to an external housing 8. Thermal conductivity of approximately U-shaped cross section is 0.1 cal / cm ・ s ・ ℃
As described above, a heat conductor 4 having good heat conductivity, and a control unit that is housed in the heat conductor 4 and connected to the light emitting display body 3 to selectively control lighting of each of the light emitting dots 2. 5 and each electronic component 6 and the like, and the drive circuit board 7 is mounted.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a dot matrix light emitting display module using an LED light emitting element.

[0002]

[Prior Art]

 As the dot matrix light emitting display module, for example, as shown in FIGS. 5 and 6, a mask plate 111 having a large number of through holes 100 formed vertically and horizontally is arranged on the upper surface of a wiring substrate 110, and the mask plate 111 is formed. A dot matrix light emitting display body 102 in which at least one LED light emitting element (not shown) arranged and wired on the wiring board 110 is housed in each through hole 100 and individual light emitting dots 101 are formed in a matrix. There is one in which a control unit 103 for controlling lighting of each light emitting dot 101 of the light emitting display body 102 and a drive circuit board 104 on which various electronic components 106 are mounted are connected via electrode pins 105.

In this dot matrix light emitting display module, when each light emitting dot 101 of the dot matrix light emitting display body 102 is turned on, the temperature of the light emitting display body 102 rises due to heat generation of each LED light emitting element, so that the electrode pin 105 and the spacer A gap is formed between the light emitting display body 102 and the drive circuit board 104 by means of 107, and heat is radiated by natural circulation of air in this gap.

A plurality of the dot-matrix light emitting display modules are accommodated and arranged side by side vertically and horizontally in a casing (not shown) such as a case via a mounting stud 108. In general, this enclosure is installed on the wall of a building or the wall of a room after connecting to an external controller (not shown) composed of a CPU, etc. By the lighting control according to the program of the external controller, each light emitting dot 101 of each light emitting display body 102 is selectively turned on so that a desired character, figure, symbol or the like formed of a dot pattern is displayed by light emission. Has become.

[0005]

[Problems to be solved by the device]

 However, as described above, when a large number of dot matrix light emitting display modules are housed and arranged in a housing attached to a wall surface or the like, the housing is housed in the housing so that the circulation of air with the outside air is alienated. When the temperature of the light emitting display body 102 rises due to the heat generated by each light emitting dot 101, this heat is radiated into the inside of the housing, and the heat is released inside the housing such as a gap between each light emitting display body 102 and the drive circuit board 104. The temperature inside the cage and housing will be increased. When the temperature inside the housing rises in this way, the temperature of the LED light-emitting element arranged in each light-emitting dot 101 of each light-emitting display body 102 rises further, and electrical characteristics such as a decrease in brightness are generated. There is a risk of adversely affecting the product and causing problems such as shortened life. Also, due to the temperature rise inside the housing, the control unit 103 and various electronic components 106 mounted on the drive circuit board 104 are also heated by the heat generated from themselves, and the temperature exceeds the allowable range of reliability. Then, there is a problem that the electric characteristics are adversely affected.

As described above, when the dot matrix light emitting display module is housed in the housing and used, the temperature rise inside the housing caused by the heat generated from the LED light emitting elements and the drive circuit board is reduced. It is necessary, for example, to make a number of ventilation holes for air circulation with the outside air in the housing in advance, or to install a fan that forcibly ventilates the air inside the housing, especially when the amount of heat generated is large. Had to take action. Therefore, even when used by being housed and arranged in a housing, etc., the heat generated by each light emitting dot 101 can be efficiently discharged directly to the outside air by heat conduction, and the temperature rise inside the housing can be mitigated. Was desired.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a dot matrix light emitting display module of the present invention is a dot matrix light emitting display in which a plurality of LED light emitting elements are arranged and wired on a wiring substrate to form a plurality of light emitting dots vertically and horizontally. And a drive circuit board for selectively driving each of the light emitting dots of the light emitting display, the dot matrix light emitting display module comprising: It is closely adhered to the entire surface, and the above-mentioned drive circuit board is placed inside to be intimately joined to an external casing having a thermal conductivity of 0.1 cal / cm · s · ° C or higher. Similarly, the thermal conductivity is 0.1 cal / cm · s. -Characterized by providing a heat conductor of ℃ or more.

[0008]

[Action]

 In the dot matrix light emitting display module having the above structure, the LED light emitting elements arranged and wired in the plurality of light emitting dots of the dot matrix light emitting display connected to the drive circuit board are selectively turned on to control the dot pattern. When the desired characters, figures, symbols, etc. composed of are displayed by light emission, the temperature of the dot matrix light emitting display body rises due to the heat generation of the LED light emitting element that is turned on. The heat conductivity of the heat conductivity of 0.1 cal / cm · s · ° C. or more is transferred to the heat conductor of which the heat conductivity is 0.1 cal / cm · s.・ It is transmitted to the surface of the external case above ℃ and is released into the outside air by this case. Therefore, heat release to the inside of the external housing, which is fixed via the heat conductor, can be reduced, the temperature rise inside the housing is mitigated, and the temperature rise of each LED light emitting element of the light emitting display module etc. The dot-matrix light-emitting display module has improved reliability by preventing the influence on the electrical characteristics and the like.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a dot matrix light emitting display module according to an embodiment of the present invention, FIG. 2 is a schematic plan view showing a usage state of the same embodiment, and FIG. It is a schematic expanded sectional view which followed the AA line. As shown in the figure, the dot matrix light emitting display module 1 of the present invention includes a dot matrix light emitting display body 3 in which n × n light emitting dots 2 are formed vertically and horizontally on the front side, and a back surface of the light emitting display body 3. A heat conductor 4 having a thermal conductivity of about 0.1 cal / cm · s · ° C. or more and having a substantially U-shaped cross section, which is in close contact with substantially the entire side surface and is in close contact with the outer casing 8, and A drive circuit board that is housed and arranged in the heat conductor 4 and connected to the light emitting display body 3 and that is equipped with a control unit 5 and electronic components 6 for selectively lighting and controlling the light emitting dots 2. 7 and.

As shown in FIG. 3, the dot-matrix light-emitting display 3 has a display substrate 31 which is vertically aligned on the surface side by etching a copper-clad laminate using glass epoxy resin, paper phenol, etc. as a base material. N conductive patterns 32a (for example, X pattern group) are formed on the same side, and lateral n conductive patterns 32b (for example, Y pattern group) are formed on the back surface side. Then, the conductive pattern 32b on the back surface is led out to the surface of the substrate 31 for each light emitting dot 2 through the through hole 33, and the high brightness LED light emitting element 34 is fixed thereon with silver paste or the like, and the bonding wire 35 is formed. Is connected to the other conductive pattern 32a on the substrate surface to form an n × n XY matrix lighting display circuit. Further, on the display substrate 31, a mask plate 37, in which n × n mortar-shaped through holes 36 are formed vertically and horizontally corresponding to each LED light emitting element 34, is integrally bonded, and the through hole resin 38 is used. The LED light emitting element 34 in each through hole 36 is sealed to form individual light emitting dots 2. The mask plate 37 is for preventing light from leaking to adjacent light emitting dots and for improving the visibility. The surface of the mask plate 37 is a black or gray light non-reflective surface, and the inner peripheral surface of the through hole 36 is A white light-reflecting surface is generally used. Further, a long number of electrode pins 39 corresponding to each light emitting dot 2 are projected from the substantially central portion of the four side edges of the display substrate 31 toward the back surface side. The projecting positions of these electrode pins 39 are not limited to the positions shown in the figure, and the design can be changed as appropriate, and are not limited to the positions shown in the figure.

The thermal conductor 4 adhered to substantially the entire rear surface of the dot matrix light-emitting display 3 has a thermal conductivity of, for example, metal such as iron, copper, aluminum having a thermal conductivity of 0.1 cal / cm · s · ° C. As described above, it is a bent product of a mold material or a strip-shaped metal body having a substantially U-shaped cross section, which has good thermal conductivity, and has an opening in the vertical direction, and the surface 41 has a rectangular flat surface. On this front surface 41, openings 42 are punched at four positions corresponding to the positions of the electrode pins 39 protruding from the back surface of the dot matrix light emitting display body 3. The back surface 43 also has a flat surface and is provided with a screw hole 44 for screwing the stopper 9 for fixing to the external housing 8. The outer casing 8 to which the heat conductor 4 is fixed is a metal casing made of iron, copper, aluminum or the like having a good thermal conductivity of 0.1 cal / cm · s · ° C. or higher. With a large surface area, a plurality of dot-matrix light emitting display module 1 are arranged and housed to be mounted as one display on the wall surface outdoors or indoors. It should be noted that the outer surface of the outer housing 8 may be provided with a radiating fin structure (not shown) so as to secure a heat radiating area to the outside air.

The drive circuit board 7 fixed in the heat conductor 4 via the stopper 71 turns on / off the LED light emitting elements 34, which constitute each light emitting dot 3 of the dot matrix light emitting display body 3. Since a control unit 5 for controlling the CPU and various electronic components 6 are mounted, a connection cable for connecting an external controller (not shown) composed of a CPU or the like or the dot matrix light emitting display module 72 have been derived. The cable 72 may be provided with holes on the left and right side surfaces of the heat conductor 4 or may be provided with notches so as to be led out to the outside. Further, pin insertion holes 73 through which the respective electrode pins 39 projecting on the back surface of the light emitting display body 3 are inserted to establish electrical conduction are formed.

In the dot-matrix light-emitting display module 1 having the above-described configuration, the electrode pins 39 of the dot-matrix light-emitting display 3 are inserted into the respective openings 42 without contacting the heat conductor 4, and the fasteners 71 are provided. The drive circuit board 7 is fixed to the heat conductor 4 by means of the pin insertion holes 73 corresponding to the heat conductor 4, and is attached integrally with the heat conductor 4. It is advisable that the surface 41 is closely bonded, for example, via a heat conduction paste or a silicone rubber layer for maintaining good adhesion, that is, heat conductivity.

Such a dot-matrix light emitting display module 1 is arranged, for example, in a plurality of rows and columns in an external housing 8 attached to the wall surface of the above-mentioned building, and a fastener 9 is provided for each of the heat conductors 4. By screwing into the screw holes 44 of the rear surface 43 of the module 1, the rear surface-side surface portion 43 of the heat conductor 4 of the individual module 1 and the inner surface portion of the outer casing 8 are adhered to each other, and they are integrally joined and attached to the outer casing. It is accommodated and arranged in 8. Also in this case, it is advisable to adhere to each other via a heat-conducting paste or a silicone rubber layer for maintaining good thermal conductivity at the joint. Then, each module 1 or an external controller (not shown) is connected with each connection cable 72 led out from the drive circuit board 7, and each light emitting dot of each light emitting display body 3 is programmed according to the program of the controller. It becomes possible to display or flow display desired characters, figures, symbols, etc., which are composed of dot patterns, by selectively controlling the lighting of the LED light emitting elements 34 in the window 2.

When each light emitting dot 2 is selectively turned on, the temperature of each dot matrix light emitting display body 3 rises due to its heat generation, but this heat is adhered and fixed to substantially the entire back surface side of each light emitting display body 3. To the external housing 8 fixed to the back surface 43 of the thermal conductor 4, and is then radiated from the surface of the external housing 8 to the outside air. Therefore, the heat generated by the selection lighting of each light emitting dot 2 of each light emitting display body 3 is less radiated to the inside of the external housing 8, and is radiated directly to the outside air, and the internal temperature of the external housing 8 is reduced. Is less likely to rise. Therefore, the temperature rise of the light emitting display body 3 itself is alleviated, and there is a great concern that the temperature rise of the LED light emitting elements 34 arranged in each light emitting dot 2 may adversely affect the electrical characteristics such as the brightness decrease and the life of the LED light emitting element 34. Is alleviated.

Since the amount of heat generated by each electronic component 6 mounted on the drive circuit board 7 is about half of the amount of heat generated by lighting of each light emitting dot 2 of the light emitting display body 3, the amount of heat generated is small. The rise in the internal temperature of the external housing 8 caused by the lighting of each light emitting dot 2 of the optical display 3 is reduced, and the adverse effects on the electrical characteristics of the control unit 5 and each electronic component 6 are alleviated. ..

Here, as the heat conductor having good heat conductivity, which is adhered to the substantially entire back surface side of the dot matrix light emitting display body 3 and fixed to the outer casing 8, not limited to the above-described embodiment, but the heat conduction body shown in FIG. As shown in FIG. 2, the upper and lower parts are made of substantially U-shaped metal heat conductors 45, 45, and the drive circuit board 7 is mounted in the two heat conductors 45, 45 by the fasteners 71. In addition, in order to facilitate the manufacture of the dot matrix light emitting display module, it may be divided into two parts on the left and right, or a housing (not shown) that is divided into a plurality of parts and joined and assembled. Good.

In any case, it goes without saying that a material having a high heat conductivity and a large heat conduction cross-sectional area is preferable as the heat conductor, because the heat conduction amount increases. For example, as described above, it is effective that the metallic material has a thermal conductivity of 0.1 cal / cm · s · ° C. or more and the thickness thereof is 1 mm or more.

[0020]

[Effect of the device]

 As is clear from the above description, in the dot matrix light emitting display module of the present invention, when the temperature of the dot matrix light emitting display is raised by the heat generated by lighting the LED light emitting element, the back surface of the dot matrix light emitting display is increased. Heat is conducted to a heat conductor having a thermal conductivity of 0.1 cal / cm · s · ° C. or more, which is adhered to substantially the entire side surface, and the heat conductor is fixed to the heat conductor. The heat is transmitted to the external case of more than cm · s · ° C and radiated to the outside. Therefore, the heat generated in the dot matrix light emitting display is sufficiently radiated, and there is less concern that the temperature of each LED light emitting element will rise and deteriorate the electrical characteristics or shorten the life. Since the influence of heat on the drive circuit board arranged in the body is also reduced, it is possible to provide a dot-matrix light emitting display module that is highly reliable for heat.

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of a dot matrix light emitting display module according to an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a usage state of the embodiment shown in FIG.

3 is a schematic cross-sectional view of the above embodiment taken along the line AA of FIG.

FIG. 4 is a schematic exploded perspective view of a dot matrix light emitting display module according to another embodiment of the present invention.

FIG. 5 is a schematic perspective view of a conventional dot matrix light emitting display module.

6 is a schematic plan view of the conventional example of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 dot matrix light emitting display module 2 light emitting dots 3 dot matrix light emitting display 34 LED light emitting element 37 through hole 4 thermal conductor 7 drive circuit board 8 external housing

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[Procedure amendment]

[Submission date] December 21, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Drawing

[Correction method] Change

[Correction content]

[Document name] Drawing

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (1)

[Scope of utility model registration request] 1. A dot matrix light emitting display body comprising a plurality of LED light emitting elements arranged and wired on a wiring board to form a plurality of light emitting dots vertically and horizontally, and each of the light emitting dots of the light emitting display body is selected. A dot matrix light emitting display module comprising a driving circuit board for driving lighting, which is adhered to substantially the entire back surface side of the dot matrix light emitting display and has the driving circuit board arranged inside. It is characterized in that a heat conductor having a thermal conductivity of 0.1 cal / cm · s · ° C. or more is also provided, which is closely joined to an external casing having a thermal conductivity of 0.1 cal / cm · s · ° C. or more. Dot matrix light emitting display module.