JP2007155899A - Led display unit and led display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED display unit capable of efficiently dissipating heat to the outside, even when using an LED module that is large in heat generation and also maintaining the strength as a display unit. <P>SOLUTION: The LED display unit is provided with the LED module 1, which has many LED elements 1b mounted on its top surface side; a heat-conducting sheet 2, which is arranged on the reverse surface side of the LED module 1 so that its top surface side is in contact with the LED module 1; a metallic chassis 3 which is arranged on the reverse surface side of the heat-conducting sheet 2 in contact with the heat conduction sheet 2; and a rear cover 6 which is arranged further on the reverse surface side of the chassis 3 and has a vent hole 6a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an LED display including an LED module on which a large number of LED elements are mounted on the surface side, and an LED display system including the LED display.

  As such an LED display, for example, a display device that performs various dynamic displays by mounting a large number of LED elements on the surface side in a matrix and controlling each LED element based on display data is known. . Such LED indicators are used for various purposes such as distribution of news on the walls of buildings and trains, and guidance displays placed in public places.

  7 to 9 show a typical configuration example of an LED display according to a known technique, FIG. 7 is an exploded perspective view seen from the front side, FIG. 8 is an exploded perspective view seen from the back side, FIG. 9 shows a side sectional view. The LED display includes a front cover 101, an LED module 102, a chassis 103, a control unit 104, a power supply unit 105, and a rear cover 106 in order from the front side. A large number of LED elements 102a are mounted on the LED module 102 in a matrix, and various dynamic displays of single color or color can be performed. The LED element 102a is mounted on the front surface side of the rectangular support substrate 102b, and a drive circuit for driving the LED element 102a is mounted on the back surface side of the support substrate 102b.

  The chassis 103 is made of metal such as aluminum and has an effect of reinforcing the entire display. On the back side of the chassis 103, a control circuit 104 for controlling the drive of the LED module 103, a control unit 104 that stores display data, and the like are provided. The power supply unit 105 is mounted with a power supply circuit for applying an appropriate voltage to the LED module and the control unit 104. Furthermore, a top cover 107 for covering the upper surface side of the LED display, a bottom cover 108 for covering the lower surface side, and a side cover 109 for covering the left and right side surfaces are provided.

  In addition, a fan 110 is provided on the bottom side in order to discharge heat released from the LED module 102, the control unit 104, and the power supply unit 105 to the outside. The fan 110 is set in the vertical direction because the rotation axis of the fan is set in the vertical direction in consideration of the mounting of the LED display body when installing on the wall or hanging from the ceiling. It is necessary to secure a dimension for housing the fan in the direction D3) in FIG. Therefore, the conventional LED display has a large dimension in the thickness direction. For example, when the LED display is directly mounted on the wall surface, the amount of protrusion from the wall surface to the display surface of the LED display increases, which is The experience is lost. Moreover, when using it embedded in a wall surface, there existed a problem that the necessity of taking a lot of embedding installation hole depth would arise. Further, the provision of the fan not only requires energy for driving the fan, but also causes another problem that noise is generated by driving the fan.

  Therefore, configurations disclosed in the following Patent Documents 1 and 2 have been proposed as prior art having a cooling structure that does not use a fan. A surface light source device disclosed in Patent Document 1 includes a plurality of LED elements, an LED substrate on which the LED elements are mounted, a light guide plate to which irradiation light from the LED elements is guided, and at least a part of the LED substrate is a display plate case. It is closely attached via a heat conductive material.

  The display disclosed in Patent Document 2 includes a mounting board on which LED elements are mounted and a heat dissipation plate that is thermally connected to a display unit that is a part of the housing. Further, the irradiation light from the LED element is configured to be guided to the light guide plate.

JP 2005-38771 A JP 2004-325604 A

  All of the above prior arts are devices using LED elements, but all of them guide the irradiation light to the light guide plate, and are equipped with a large number of LED elements as in the present invention to display dynamically. It is not about. In Patent Document 1, the heat conductive material is disposed between the LED substrate and the LED cover, and heat is radiated through the LED cover. There is a problem that it feels hot when the appearance is touched by hand. When display control is performed with a large number of LED elements mounted as in the present invention, it is considered that there is more heat generation than in Patent Document 1, which is not a preferable configuration. Moreover, in patent document 2, it is the structure which the heat sink is exposed to the external appearance, and there exists a problem that it becomes difficult to ensure intensity | strength depending on the raw material of a heat sink.

  The present invention has been made in view of the above circumstances, and the problem is that even when an LED module having a large calorific value is used, heat can be efficiently radiated to the outside, and the strength as a display can be maintained. It is to provide an LED display that can be used.

In order to solve the above problems, an LED display according to the present invention is
An LED module having a large number of LED elements mounted on the surface side;
On the back side of the LED module, a heat conductive material arranged so that the front side contacts the LED module;
A metal reinforcing member disposed in contact with the heat conductive material is provided on the back side of the heat conductive material.

  The operation and effect of the LED display device having such a configuration will be described. This LED display includes an LED module on which a large number of LED elements are mounted on the front surface side, and a heat conductive material is disposed on the back surface side thereof. Therefore, the heat generated from the LED module on which the LED element or the like is mounted is transmitted by the heat conductive material. A metal reinforcing member is disposed in contact with the back surface side of the heat conducting material. That is, the heat conductive material is in contact with both the LED module and the reinforcing member, and plays a role of transmitting heat generated in the LED module from the LED module to the reinforcing member. Further, by providing the reinforcing member, it is possible to increase the strength of the entire display and to effectively dissipate heat. Further, the heat generated on the front surface side of the display can be efficiently transferred to the back surface side. As a result, it is possible to provide an LED display that can efficiently radiate heat to the outside even when using an LED module that generates a large amount of heat, and can maintain the strength of the display.

  In the present invention, the heat conductive material is preferably formed of an elastic material.

  For example, by forming a heat conductive material from a silicon material or the like, it can be brought into close contact with the back side of the LED module on which the electronic circuit is mounted, and the heat dissipation effect can be enhanced. Moreover, since the adhesiveness with the reinforcing member is improved, the heat dissipation effect can be further enhanced.

  In the present invention, the reinforcing member has a substantially U-shaped cross-sectional view in a side view, and a heat radiation fin is integrally formed on the reinforcing member in a space portion enclosed by the approximately U-shaped. preferable.

  According to this configuration, the cross-sectional shape of the reinforcing member in a side view is substantially U-shaped, so that a space is formed in the portion enclosed in the U-shaped, and the heat radiation fin is formed integrally with the reinforcing member. To do. Thereby, the heat transmitted from the heat conducting material can be radiated more efficiently through the reinforcing member.

  In this invention, it is preferable to provide the rear cover which is arrange | positioned at the back surface side of the said reinforcement member, and has a thermal radiation function.

  By providing a rear cover having a heat dissipating function on the back side of the reinforcing member, heat is transmitted to the reinforcing member via the heat conductive material, and further released to the outside via the rear cover. As described above, since heat is released from the back side of the display main body, even if the LED display front side is inadvertently touched, there is no problem that the hand feels hot.

  In the present invention, it is preferable that the rear cover has a large number of ventilation holes.

  Various configurations are conceivable as a mode in which the rear cover is provided with a heat dissipation function. However, by forming a large number of ventilation holes, the heat dissipation function can be provided without cost.

  In the present invention, it is preferable that the outer size of the reinforcing member is formed to be smaller than the outer size of the LED module in a front view.

  Thereby, it is possible to prevent the reinforcing member from being seen from the front side and not to impair the appearance of the appearance. For example, by making the size of the reinforcing member slightly smaller than the size of the LED module, it is possible to secure the heat dissipation effect to the maximum while ensuring the appearance of the appearance.

  In the present invention, a front cover formed of a light-transmitting material is disposed on the surface side of the LED module, the front cover is formed in a substantially C shape in a side view, and a C-shaped tip portion Preferably, the reinforcing member is formed with a guide groove that can be slidably fitted from the side.

  By disposing a light-transmitting front cover on the surface side of the LED module, display information can be shown through the front cover and a dustproof effect can be provided. In addition, by making the front cover substantially C-shaped, it is possible to adopt a configuration that can be slidably fitted to the reinforcing member, facilitating assembly, and making the appearance size in front view closer to the size of the display area. This is advantageous in that the size can be reduced.

  In order to solve the above problems, an LED display system according to the present invention includes an LED display according to the present invention, a power supply unit for supplying power to the LED display, and a control unit for controlling the LED module. And a controller provided.

  According to this configuration, the control unit and the power supply unit are accommodated in a controller that is a separate unit from the LED display. Therefore, since the control unit and the power supply unit are not provided, heat generated inside the LED display can be reduced, and the entire display can be reduced in size. Moreover, about a controller, it can be arrange | positioned in an appropriate place by making it a separate unit.

  A preferred embodiment of an LED display according to the present invention will be described with reference to the drawings. 1 to 3 show the configuration of the LED display according to the first embodiment, FIG. 1 is an exploded perspective view seen from the front side, FIG. 2 is an exploded perspective view seen from the back side, and FIG. The figure is shown. 4 to 6 show the configuration of the LED display according to the second embodiment, FIG. 4 is an exploded perspective view seen from the front side, FIG. 5 is an exploded perspective view seen from the back side, and FIG. The figure is shown.

<Configuration of First Embodiment>
First, the configuration of the LED display according to the first embodiment will be described. The LED module 1 has a large number of LED elements 1b arranged in a matrix on the surface side of a rectangular LED substrate 1a. Each LED element 1b includes an LED chip for outputting a single color or a color. A drive circuit for driving the LED element 1b is mounted on the back side of the LED substrate 1a, and a large number of chip resistors, capacitors, ICs, and the like are mounted, and a wiring pattern is formed. A connector for connection is also mounted. Moreover, the support | pillar 1c in which the internal thread for coupling | bonding was formed is also provided.

  On the back side of the LED module 1, a sheet-like heat conductive material (hereinafter referred to as a heat conductive sheet 2) is disposed in close contact. This heat conductive sheet is preferably formed of a material having insulating properties and good heat conductivity, for example, a silicon material. Moreover, if it forms with elastic bodies, such as a silicon material, it can closely_contact | adhere and arrange | position over the whole back surface side of LED board 1a which has an uneven | corrugated | grooved part. Thereby, since the installation area of the LED module 1 and the heat conductive sheet 2 can be increased, the heat which the circuit element mounted in LED and an LED board generate | occur | produces can be efficiently transmitted to a heat conductive sheet. Moreover, the opening part 2a is formed in the heat conductive sheet 2, and it is comprised so that it may not contact high parts, such as a connector and IC. Further, by using the heat conductive sheet 2, the LED substrate 1a can be brought into close contact with almost the entire back surface, can efficiently dissipate heat, and since it is a sheet, the thickness direction D1 is reduced. Can also contribute. The mounting method of the heat conductive sheet 2 to the LED module 1 is such that both parts are sandwiched using a screw or the like, or if the heat conductive sheet 2 has adhesiveness, its adhesive force is used. Other methods may be adopted as long as the method can hold both parts in contact with each other.

  A chassis 3 (corresponding to a reinforcing member) is disposed on the back surface side of the heat conductive sheet 2 and is disposed in close contact with the heat conductive sheet 2. In order to improve heat dissipation, the chassis 3 is made of metal such as aluminum, aluminum alloy, copper, copper alloy. An opening 3 a is formed in the chassis 3 and is formed at a position corresponding to the opening 2 a formed in the heat conductive sheet 2. The chassis 3 has substantially the same cross-sectional shape in the longitudinal direction, and is formed in a substantially U shape. When viewed from the side, the chassis 3 is formed with engaging grooves 3b in the vertical direction. Further, a coupling hole 3c is formed at a position where the engagement groove 3b is formed, and the LED module 1, the heat conductive sheet 2, and the chassis 3 are integrally coupled by inserting a screw 4 therefrom. can do. The screw 4 is screwed to the support 1c. Further, the chassis 3 is formed with a support piece 3 f and supports the rear cover 6. As can be seen from FIG. 3, the head of the screw 4 is not exposed in the engagement groove 3b. The chassis 3 is formed in a plate shape as a whole and contributes to a reduction in thickness in the thickness direction D1. In addition, in FIG. 2, although the heat conductive sheet 2 is formed by one sheet, you may spread a several heat conductive piece.

  A front cover 5 that is an external component is provided on the front side of the LED module 1 and is formed of, for example, a colorless and transparent resin. The front cover 5 is substantially C-shaped in a side view, and the front end portion 5a is engaged (fitted) with the engagement groove 3b. When assembling, the front end portion 5a of the front cover 5 is inserted into the engaging groove 3b from the side and slid in the longitudinal direction so that it can be assembled to the chassis 3.

  A rear cover 6 as an external component is further provided on the back side of the chassis 3 and is formed as a metal or resin plate. The rear cover 6 is formed with a large number of ventilation holes 6a to enhance the heat dissipation effect. The rear cover 6 is provided with a plurality of coupling holes 6b, and can be coupled to a female screw 3d formed on the chassis 3 by screws (not shown). In addition, a hole 6 c through which the wiring cord 7 is passed is also formed in a part of the rear cover 6.

  As shown in FIG. 3, a space portion S is formed between the rear surface side of the chassis 3 and the inside of the rear cover 6 (portion included in the U shape of the chassis 3). The transmitted heat is dissipated or used as a wiring space. Specifically, it is used as a storage space for the connector 8 connected to the connector 1 d provided on the LED substrate 1 and the wiring cord taken out from the connector 8.

  In addition, at least one end of the front cover 5 having a transparent front portion can be slidably engaged with the engagement grooves 3b above and below the chassis 3, so that the front cover 5 can be slid in the front-rear (thickness) direction. It keeps it from moving in the direction. The left and right directions of the front cover 5 are performed by the side cover 9.

  Side covers 9 are provided on the left and right side surfaces, and the screws 10 are screwed into female screws 3 e formed on the side surfaces of the chassis 3, whereby the side covers 9 are coupled to the chassis 3. A protrusion 3 b is formed inside the side cover 9 and fits inside the C-shape of the front cover 5.

  A controller 20 separate from the LED display is provided, and includes a control unit 20a and a power supply unit 20b. The LED display and the controller 20 are electrically connected by the wiring cord 7. The control unit 20a includes a CPU for controlling the LED display, a control circuit, a memory, and the like, and display data and the like for displaying with the LED are stored in the memory. The power supply unit 20b is provided to supply an appropriate drive voltage to the LED module 1 and the control unit 20a.

<Action and effect>
According to such a configuration, the LED display and the controller 20 are separate units, and the LED display can be downsized and heat generation by the control unit 20a and the power supply unit 20b is eliminated. The calorific value can be reduced. This eliminates the need for forced cooling by the fan, and further miniaturization can be achieved by not using the fan. Moreover, since it is not necessary to drive a fan, energy consumption can be reduced. Since it is not necessary to use a fan, the dimension in the thickness direction can be reduced.

  Heat generated by the LED module 1 can be radiated from the back side of the LED display through the heat conductive sheet 2, the chassis 3, and the rear cover 6. The LED display has a sealed structure with the front cover 5 and the left and right side covers 9, and realizes a dustproof effect. However, since the rear cover 6 is provided with a vent hole 6a, heat is not accumulated inside and efficiently radiated. can do.

  By forming the heat conductive sheet 2 with an elastic body such as a silicon material, the heat conductive sheet 2 can be brought into close contact with the LED substrate 1a and the chassis 3, and heat can be efficiently transmitted. Further, heat can be radiated from the chassis 3 to the outside through the vent hole 6a of the rear cover 6 efficiently.

  Further, the size of the heat conductive sheet 2 in front view and the size of the chassis 3 in front view are set to be slightly smaller than the size (rectangular size) in front view of the LED substrate 1a of the LED module 1. Thereby, when the LED display is viewed from the front, the heat conductive sheet 2 and the chassis 3 are not seen, so the appearance of the display is not impaired.

  Furthermore, since the front cover 5 is formed in a C shape, the size of the outer shape in front view can be made closer to the size of the display area (area where the LED elements are arranged), and the size in front view can be reduced. can do.

<Configuration of Second Embodiment>
Next, a second embodiment of the LED display according to the present invention will be described with reference to FIGS. The portions having the same functions as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In the second embodiment, the heat dissipating fins 3g are formed integrally with the chassis 3. As shown in FIG. 5, the fin 3g is formed in the part where the opening 3a is not formed, and this further enhances the heat dissipation effect. By providing the fins 3g, the space portion S provided as a wiring space can be effectively used.

<Another embodiment>
In the present embodiment, the shape of the LED substrate 1a on which the LED element is mounted is not limited to a rectangle, and may be another shape. Further, the substrate may be configured by connecting a plurality of substrates instead of a single substrate.

  In order to give the rear cover a heat radiating function, a vent hole is formed, but the present invention is not limited to this. Also in this embodiment, the rear cover 6 is coupled to the chassis 3. However, if the rear cover 6 is made of a material having good heat conductivity such as a metal, heat can be efficiently transferred directly from the chassis 3 to the rear cover 6. And the heat dissipation effect can be enhanced. Further, when the vent hole 6a is formed in the rear cover 6, the shape thereof does not have to be circular, and can be appropriately changed such as a slit shape.

  Although the configuration including the rear cover 6 is described in the present embodiment, the rear cover 6 is not necessarily required. The rear cover 6 is provided in consideration of improvement in appearance, prevention of impurities, electrical safety, and ease of installation on the installation surface. The rear cover 6 does not have to be provided.

The perspective view which looked at the LED indicator concerning a 1st embodiment from the surface side The perspective view which looked at the LED indicator concerning a 1st embodiment from the back side. Side sectional view of the LED display according to the first embodiment The perspective view which looked at the LED display concerning 2nd Embodiment from the surface side The perspective view which looked at the LED indicator concerning a 2nd embodiment from the back side. Side sectional view of the LED display according to the second embodiment The perspective view which looked at the LED display concerning a prior art from the surface side The perspective view which looked at the LED display concerning a prior art from the back side Side sectional view of an LED display according to the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED module 1a LED board 1b LED element 2 Thermal conduction sheet 3 Chassis 3b Engaging groove 3g Fin 4 Screw 5 Front cover 5a Control part 6 Rear cover 6a Vent hole 7 Wiring cord 8 Connector 9 Side cover 20 Controller 20a Control part 20b Power supply part S space

Claims (8)

An LED module having a large number of LED elements mounted on the surface side;
On the back side of the LED module, a heat conductive material arranged so that the front side contacts the LED module;
An LED display comprising a metal reinforcing member disposed in contact with the heat conductive material on a back surface side of the heat conductive material.   The LED display according to claim 1, wherein the heat conductive material is formed of an elastic material.   The reinforcing member has a substantially U-shaped cross-section in a side view, and heat radiation fins are formed integrally with the reinforcing member in a space portion enclosed in the substantially U-shaped shape. Item 3. An LED display according to item 1 or 2.   The LED display according to any one of claims 1 to 3, further comprising a rear cover disposed on the back side of the reinforcing member and having a heat dissipation function.   The LED display according to claim 4, wherein the rear cover has a plurality of ventilation holes.   6. The LED display according to claim 1, wherein the outer shape of the reinforcing member is formed to be smaller than the outer size of the LED module in a front view.   A front cover made of a light-transmitting material is disposed on the surface side of the LED module, the front cover is formed in a substantially C shape in a side view, and the C-shaped tip is viewed from the side. The LED display device according to claim 1, wherein a guide groove capable of sliding fitting is formed in the reinforcing member.   An LED display according to any one of claims 1 to 7, a power supply unit for supplying power to the LED display, and a controller having a control unit for controlling the LED module. LED display system.

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