JPH0581874U - Dot matrix light emitting display device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a dot matrix light emitting display device capable of efficiently releasing heat generated by the dot matrix light emitting display body 3. [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 heat conduction having a substantially U-shaped cross section that is adhered to substantially the entire back surface side of the light emitting display material 3. Of good heat conductivity, and a control unit 5 and electronic components 6 connected to the light emitting display 3 on the back surface side of the heat conductor 4 for selectively lighting and controlling the respective light emitting dots 2. The drive circuit board 7 on which components such as the above are mounted is closely attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dot matrix light emitting display device using an LED light emitting element or the like.

[0002]

[Prior Art]

 As the dot matrix light emitting display 102, for example, as shown in FIG. 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 board 110, and each through hole of the mask plate 111 is arranged. A dot matrix light emitting display body 102 in which at least one LED light emitting element (not shown) arranged and wired in the wiring board 110 is housed in 100 to form individual light emitting dots 101 in a matrix, and the light emitting display. A control unit 103 for controlling lighting of each light emitting dot 101 of the body 102 and a drive circuit board 104 on which various electronic components 106 are mounted are connected by an electrode pin 105 in consideration of air circulation through a spacer 107. There is something I did.

In this dot matrix light emitting display body 102, for example, as shown in FIG. 7, the light emitting display body A is fixed to a support plate 120 via mounting studs 108, and, for example, ventilation holes 123 are formed on the upper and lower surfaces. The display controller 122 including a CPU and the like is housed in a perforated metal casing 121, and the individual light emitting display bodies A are connected to each other. The casing 121 is installed on a wall surface of a building or an indoor wall surface and the like. It was generally used as a dot-matrix light-emitting display device lined up with. Such a light-emitting display device A is configured to be a dot pattern by selectively controlling the light-emitting dots 101 of each light-emitting display body 102 by performing lighting control according to a program of the display controller 122. The characters, figures, symbols, etc. are displayed in a light emitting manner.

In the dot-matrix light-emitting display A, at the time of light-emitting display, each LED light-emitting element of each light-emitting dot 101 of the light-emitting display 102 is turned on, and inside the electronic component 106 mounted on the drive circuit board 104. The internal temperature of the casing 121 rises due to heat generation and the like to generate convection in the air, and cold outside air flows in through the ventilation holes 123 formed in the lower surface of the casing 121, and the spacer 107 drives the light emitting display body 102 and the light emitting display body 102. After the temperature is raised by circulating through the gap formed between the circuit board 104 and the circuit board 104, warm air is released from each ventilation hole 123 formed in the upper surface of the housing 121 to cool the inside of the housing 121. It was cooled by the natural air flow.

[0005]

[Problems to be solved by the device]

 However, as described above, in the dot matrix light emitting display device A, since natural air convection is caused to ventilate the outside air in order to mitigate the temperature rise in the housing 121, the light emitting display device 102 and the drive circuit. Since it is necessary to form a gap with the substrate 104, the size must be increased, and the case 121 becomes larger and heavier, which not only increases the cost, but the temperature inside the case 121 is inevitably higher than the outside air temperature. There was a problem that became.

Further, instead of natural air convection, the inside of the housing 121 may be forcibly replaced by an electric fan or the like, but this also requires a space for separately attaching a device such as an electric fan to the display device, There is a problem that it becomes larger. In addition, there is also a problem that dust and the like in the outside air enters and adheres inside the housing 121.

As described above, when the temperature inside the housing rises, the temperature of the LED light emitting element arranged in the light emitting dot 101 of each light emitting display body 102 is further raised, and the electric power such as the decrease in brightness is generated. There is a possibility that the physical characteristics may be adversely affected and that problems such as shortening of life may occur.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, a dot matrix light emitting display device of the present invention is a dot matrix light emitting display device 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 in vertical and horizontal directions. The back side of the light-emitting device is closely attached to a heat conductor having good heat conductivity, and a drive circuit board for selectively driving each light-emitting dot of the light-emitting display is closely attached to the back face of the heat conductor. It is characterized in that

[0009]

[Action]

 In the dot matrix light emitting display device having the above configuration, each LED light emitting element arranged and wired in the plurality of light emitting dots of the dot matrix light emitting display connected to the drive circuit board is selectively turned on to control the dot pattern. When a desired character, figure, symbol, etc. composed of is displayed by light emission, the temperature of the dot matrix light emitting display body rises due to the heat generated by the light emitting LED light emitting element. This heat adheres to the back side of the light emitting display body. It conducts to the heat conductor having good heat conductivity, and the heat is released to the outside by this heat conduction. On the other hand, the self-heating of the electronic components for selectively lighting each light-emitting dot mounted on the drive circuit board is also conducted to the closely-bonded heat conductor as described above, and therefore each LED light-emitting element of the light-emitting display or the like. The dot-matrix light-emitting display device is improved in reliability by preventing and mitigating the adverse effects on the electrical characteristics and life characteristics due to the temperature rise.

[0010]

【Example】

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

FIG. 1 is a partially broken exploded perspective view showing a dot matrix light emitting display device according to an embodiment of the present invention, and FIG. 2 is a schematic vertical sectional view showing a usage state of the same embodiment. .. As shown in the figure, the dot matrix light emitting display device 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 surface side, and a light emitting display body 3 of the dot matrix light emitting display body 3. A heat conductor 4 having good thermal conductivity, which is adhered to substantially the entire back surface side and is bent into a substantially U-shaped cross section, and the light emitting display 3 which is adhered to the back surface side of the heat conductor 4. The control unit 5 for selectively controlling the lighting of each of the light emitting dots 2 and the drive circuit board 7 on which the electronic components 6 are mounted.

As shown in FIG. 3, the dot-matrix light-emitting display 3 has a wiring board 31 which is vertically arranged on the front 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 LED light emitting element 34 of high brightness is fixed thereon with silver paste or the like, and the bonding wire 35 is used. By connecting to the other conductive pattern 32a on the surface of the substrate, an n × n XY matrix lighting display circuit is constructed. Further, the wiring board 31 is integrally joined with 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. The LED light emitting element 34 in each through hole 36 is sealed to form each light emitting dot 2. The mask plate 37 is for preventing light from leaking to adjacent light emitting dots and improving 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. Then, each electrode pin 39 of the XY matrix lighting display circuit corresponding to each light emitting dot 2 is projected on the back surface side of the wiring board 31. 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 back surface side of the dot matrix light emitting display 3 has a thermal conductivity of, for example, a metal system such as iron, copper or aluminum having a thermal conductivity of 0.1 cal / cm · s · ° C. It has good thermal conductivity as described above, and is a bent product of a mold material or a strip-shaped plate having a substantially U-shaped cross section. The front surface portion 41 is provided with four long hole-shaped openings 42 at four positions corresponding to the lead-out positions of the electrode pins 39 protruding from the back surface of the dot matrix light emitting display body 3. It is needless to say that the opening 42 is not limited to the one shown in the figure and may be a hole corresponding to each electrode pin 39 (minimum hole capable of holding electrical insulation with the electrode pin). For example, the upper and lower edges 43 and 44 of the heat conductor 4 are made of metal having good heat conductivity, such as iron, copper, and aluminum, which are bent into a substantially U-shape similar to the heat conductor 4. A hermetically sealed container is formed by stacking and mounting the upper and lower edges 81, 82 of the housing 8.

The drive circuit board 7 closely attached to the back surface side of the heat conductor 4, that is, the inner surface 45 side is the dot matrix light emitting display member on the surface of a multilayer printed board having a glass epoxy resin or the like as a base material. The control unit 5 for driving and controlling the lighting and extinguishing of the LED light emitting elements 34 constituting the respective light emitting dots 3 of No. 3 and various electronic components 6 are mounted to form a drive circuit, and the above-mentioned light emitting display is provided. Each of the electrode pins 39 projecting on the back surface of the body 3 is inserted to form a pin insertion hole 71 that is connected to the drive circuit. The light-emitting display 3 and the drive circuit board 7 are electrically connected via the electrode pins 39, so that lighting can be driven. Then, for example, the display controller 9 or the like configured by a CPU or the like housed in a closed container and the control unit 5 are connected to perform lighting control of desired characters and figures.

The dot-matrix light-emitting display device 1 having the above-described configuration has four long holes without contacting the electrode pins 39 of the dot-matrix light-emitting display 3 with the heat conductors 4 (which may be in an electrically insulated state). While being inserted into the circular opening 42, the back surface side is joined to the front surface portion 41 of the heat conductor 4 with, for example, an adhesive having heat conductivity so as to be closely integrated. On the other hand, the drive circuit board 7 is also bonded to the inner surface 45 of the heat conductor 4 with, for example, an adhesive having heat conductivity, and the rear surface of the light emitting display body 1 corresponding to each pin insertion hole 71 of the drive circuit board 7. The electrode pin 39 protruding to the side is inserted and connected, and at the same time, it is connected to the display controller 9 including a control unit 5 and a CPU. Then, the housing 8 is arranged on the back side of the heat conductor 4 and the upper and lower edges 43, 81 and 44, 82 are overlapped and attached to form a hermetically sealed container.

In the dot-matrix light-emitting display device 1 having the above-described configuration, for example, as shown in FIG. 2, the device can be directly attached to a wall surface of a building by a fastener or the like not shown, and the display controller 10 can be used. According to the program, the LED light emitting elements 34 in the respective light emitting dots 2 of the light emitting display body 3 are selectively controlled to be turned on so that a desired character, figure, symbol or the like formed of a dot pattern can be displayed. In this case, since the light emitting display body 3 has a waterproof structure and the drive circuit board 7 has a structure in which the heat conductor 4 is used to block water, it can be installed outdoors. At this time, since the light-emitting element 34 that is turned on generates heat, the temperature of the light-emitting display body 3 itself rises, but this heat is conducted to the heat conductor 4 having good heat conductivity, and the outside air of the heat conductor 4 is transmitted. The heat is transmitted to the portion in contact with the casing 8 or the fixed casing 8 and is radiated from the surface to the ambient air. Further, in this case, heat is also radiated directly from the surface of the light emitting display plate 3 to the outside air. Therefore, the temperature rise of the light emitting display 3 itself is moderated, and there is a 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 significantly eased. Further, even if each electronic component 6 itself on the drive circuit board 7 for lighting each light emitting dot 2 operates and generates heat, this heat is thermally conducted through the drive circuit board 7 similarly to the light emitting display body 3. Therefore, the heat generated in the drive circuit board 7 is also radiated to the outside and the temperature rise in the container formed by the heat conductor 4 and the housing 8 is alleviated. The adverse effect on the electrical characteristics of the component 6 etc. is mitigated.

In addition, in this dot matrix light emitting display device 1, the heat conductor 4 and the casing 8 constitute a sealed container, and the drive circuit board 7 on which the electronic component 6 that generates heat is mounted is arranged. As described above, the temperature inside the container is less likely to rise, so it is effective for waterproofing, dustproofing, and explosion-proofing with a sealed container, and moreover, the volume of the entire housing is smaller than that of the conventional light emitting display A. The light emitting display device 1 is almost halved, and it is easy to mount directly on the wall surface and the like, which is advantageous in terms of cost. The housing 8 and the heat conductor 4 are integrally formed, and the light emitting display device 1a has a reasonable heat dissipation effect.

FIG. 4 is a schematic vertical sectional view showing a usage state of a dot matrix light emitting display device 1a according to another embodiment. In this light emitting display plate device 1a, the upper and lower edges 43a and 44a of the heat conducting plate 4a, which is in close contact with the back surface side of the dot matrix light emitting display body 3, are bent to the front surface side and housed inside the metal casing 8a. The dot matrix light emitting display device 1 is substantially the same as the dot matrix light emitting display device 1 except that the surface protection plate 10 serving as a filter is arranged on the surface of the light emitting display body 3 by a plate of translucent acrylic resin or the like. It is composed.

As shown in FIG. 4, the metal casing 8a in which the heat conductor 4a is housed has a box shape with the front side opened, and the front and lower edges 81, 82a and the heat conduction plate 4a are formed. The surface protection plate 10 is sandwiched and fixed between the upper and lower edges 43a and 44a.

Even in such a light emitting display device 1a, a container closed by the heat conductor 4a and the housing 8a is formed, but the heat of the light emitting display device 3 generated by lighting the light emitting element 34 is similarly generated. The heat is conducted to the heat conductor 4a having good heat conductivity, and the heat is dissipated directly from the surface of the casing 8a having a larger surface area than that of the casing 8 into the ambient air. The generated heat is also conducted to the housing 8a through the heat conductor 4a and is radiated directly into the surrounding outside air, and the temperature rise in the housing 8a is moderated. Therefore, it is possible to mitigate the adverse effects on the electrical characteristics such as a decrease in brightness due to the temperature rise of the LED light emitting elements 34 arranged in each light emitting dot 2 of the light emitting display body 3 and the fear of shortening the life. The temperature rise in the container formed by 4a and the housing 8a is also moderated, and the influence of heat on the control unit 5 and each electronic component 6 is less likely to occur, resulting in a highly reliable light emitting display device 1a. Further, the dot matrix light emitting display device 1a also serves as an airtight container, which is particularly effective for waterproofing, dustproofing, and explosion proofing, and the volume of the housing 8a is almost halved, which is advantageous in terms of cost.

It should be noted that, as shown in FIG. 5, for example, a plurality of light emitting display plates 3 are arranged in a row and in a row, respectively, as compared with the case where each of the dot matrix light emitting display devices 1 and 1a is used alone. The light-emitting display 3 is attached to the heat conductors 4 and 4a in close contact with each other, and the corresponding drive circuit boards 7 are also attached in close contact to each other and connected by wiring, and each light-emitting display 3 is connected in accordance with the program of the display controller 10. It becomes possible to selectively display and control the LED light-emitting elements 34 in the light-emitting dots 2 to display desired characters, figures, symbols and the like, which are formed in a dot pattern, in a flowing manner.

Further, the light emitting display bodies 3 and the heat conduction plates 4 and 4a, and the heat conduction plates 4 and 4a and the drive circuit board 7 are closely joined together by an adhesive agent having heat conductivity. At this time, if a rubber elastic body layer having good thermal conductivity, such as a silicone rubber layer, or a thermally conductive paste layer is placed in close contact with each other, each light emitting display body 3, the heat conductive plates 4, 4a, the drive circuit. Distortion due to thermal stress or the like caused by the different thermal expansion coefficients of the substrate 7 is absorbed and relaxed by the rubber elastic body layer or paste layer interposed, and the respective light emitting display bodies 3 and the drive circuit board 7 are deformed. It is preferable because there is no need to worry. In this case, needless to say, it is not limited to the adhesive and may be a screw or the like.

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 2 mm or more.

[0024]

[Effect of the device]

 As is clear from the above description, in the dot matrix light emitting display device of the present invention, when the temperature of the dot matrix light emitting display is raised by the heat generated by the lighting of the LED light emitting element, it becomes a heat conductor having good thermal conductivity. In addition to being conducted, the heat generated by each electronic component mounted on the drive circuit board is also conducted to the closely attached heat conductor and is radiated directly to the outside air. The effect on the electric characteristics of the elements and the like is prevented, and the dot matrix light emitting display device with high reliability is obtained.

[Brief description of drawings]

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

FIG. 2 is a schematic cross-sectional view showing a usage state of the light emitting display device of the embodiment.

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

FIG. 4 is a schematic cross-sectional view showing a usage state of a dot matrix light emitting display device according to another embodiment of the present invention.

FIG. 5 is a schematic front view showing another usage state of the dot matrix light emitting display device of the present invention.

FIG. 6 is a schematic perspective view of a conventional dot matrix light emitting display module.

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

[Explanation of symbols]

 1, 1a Dot matrix light emitting display device 2 Light emitting dot 3 Dot matrix light emitting display 31 Wiring board 34 LED light emitting element 4 Thermal conductor 7 Driving circuit board

Claims (1)

[Scope of utility model registration request] 1. A heat conductor having good heat conductivity on the back surface side of a dot matrix light emitting display body in which a large number of LED light emitting elements are arranged and wired on a wiring board to form a plurality of light emitting dots vertically and horizontally. A dot matrix light emitting display device in which a driving circuit board for selectively lighting each light emitting dot of the light emitting display is closely attached to the back surface of the heat conductor.