JP6582794B2 - LED information display panel with snow melting function and LED information display device - Google Patents

Description

  The present invention relates to an LED information display panel with a snow melting function and an LED information display device.

  In recent years, various LED information display panels such as a dot matrix display device that displays information such as desired characters and symbols by selectively emitting light from LED elements mounted in a matrix are rapidly spreading (patents). Reference 1). Such LED information display panels are also spreading as traffic information information display devices on highways, for example.

  Actually, such LED information display panels are installed in various places on the highway, and various traffic information is displayed and transmitted to a passing vehicle at any time. However, in the case of sudden and serious changes in road conditions such as traffic accidents, etc., depending on only the display device that is permanently installed in such a specific position, it may not always be possible to specify an unspecified location and time. It is not possible to display necessary information at a necessary place in response to an accident that occurs.

  In order to deal with this problem, it is light and foldable, so it can be easily transported to the required location (for example, an accident site on a highway) when necessary, and the installation and withdrawal at the installation site can be shortened. A portable LED information display panel that can be performed in time has been proposed (see Patent Document 2).

  On the other hand, when used outdoors such as an accident site on a highway, it may be affected by the weather of the installation environment. For example, when used in a snowfall area, visibility may deteriorate due to snowfall on the LED display portion of the LED information display panel. Since the LED information display panel generates less heat than an information display device such as an incandescent bulb, there is a problem that the snow on the LED display portion of the LED information display panel that has landed on snow remains without melting.

  In order to cope with this problem, by arranging a plurality of cord-like heating wires on the surface side of the LED display portion of the LED information display panel, the air inside the snow melting unit is heated, so that the LED information display that has snowed is displayed. Snow on the LED display part of the panel can be melted instantly (see Patent Document 3).

JP 2008-218674 A JP 2011-40570 A JP 2009-299335 A

  By providing the snow melting unit provided in the LED information display panel of Patent Document 3, the layer of the LED information display panel becomes thick, and the degree of freedom of arrangement of each component constituting the LED information display panel decreases. In addition, the provision of the snow melting unit simply increases the cost.

  The present invention has been made to solve the above-described problems, and the object thereof is to provide an outermost surface on the information display surface side of the LED information display panel with a snow melting function without providing a new mechanism such as a snow melting unit. It is an object to provide an LED information display panel and an LED information display device that can prevent snow from falling or melt snow that has landed on the outermost surface on the information display surface side.

  As a result of intensive studies in order to solve the above-mentioned problems, the present inventors have found that the first metal capable of conducting the LED element on the other surface side of the flexible support substrate on which the LED element is not mounted. The LED information display panel with a snow melting function in which a second metal wiring portion different from the wiring portion is newly formed has been found to solve the above problems, and the present invention has been completed.

  (1) An LED element mounted on the support substrate via a first metal wiring part capable of conducting the LED element is provided on one surface side of the support substrate having flexibility, and the other surface of the support substrate. The LED information display panel with a snow melting function in which a second metal wiring part having a snow melting function is formed on the side.

  (2) The LED information display panel with a snow melting function according to (1), wherein the support substrate is a resin having a film thickness of 30 μm to 200 μm.

  (3) In the first metal wiring part region, the first metal coverage, which is the ratio of the area of the first metal wiring part to the area of the support substrate, is 60% or more and 98% or less, and the second metal wiring part region LED information with a snow melting function according to (1) or (2), wherein the second metal coverage, which is the ratio of the area of the second metal wiring portion to the area of the support substrate, is 2% to 30%. Display panel.

  (4) An LED information display device comprising the LED information display panel with a snow melting function according to any one of (1) to (3) as an information display unit.

  The LED information display panel and the LED information display device with a snow melting function of the present invention prevent snow from adhering to the outermost surface on the information display surface side of the LED information display panel with a snow melting function without providing a new mechanism such as a snow melting unit. Or an LED information display device with a snow melting function and an LED information display device capable of melting snow that has snowed on the outermost surface on the information display surface side.

It is a perspective view which shows the whole structure of the LED information display apparatus of this invention. It is a partial perspective top view of the LED information display panel with a snow melting function of this invention. It is the elements on larger scale of the LED information display panel with a snow melting function of this invention. It is sectional drawing which shows typically the cross section in the AA of the LED information display panel of FIG.

  Embodiments of the LED information display panel with snow melting function and the LED display device of the present invention will be described below. The present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention.

<LED information display panel>
[overall structure]
As shown in FIG. 1, the LED information display panel 100 with a snow melting function of the present embodiment is an information display device in which a plurality of LED mounting modules 10 are connected in the horizontal direction. The LED mounting module 10 is a member in which a plurality of LED elements 3 are mounted in a matrix on the LED element substrate 1 and is a display member capable of displaying character information and the like. As shown in FIG. 4, the plurality of LED mounting modules 10 are stably accommodated between the display surface side resin sheet 21 and the back surface side resin sheet 22 constituting the accommodation sheet 2. Hereinafter, the LED information display panel 100 with a snow melting function in which a plurality of LED mounting modules 10 are linearly connected in one direction will be described as a representative embodiment of the present invention. Even if it is a LED information display panel with a snow melting function which has the single LED mounting module 10 which is not connected severally, as long as it satisfies other essential structural requirements, it is in the scope of the present invention.

  In addition, the first metal wiring portion 4a capable of conducting the LED element 3 on the other surface side where the LED element 3 of the flexible support substrate 11 constituting the LED element substrate 1 relating to the present embodiment is not mounted. A second metal wiring portion 4b having a snow melting function different from the above is newly formed. The second metal wiring portion 4b has a function of generating heat, and mainly prevents snow from being formed on the outermost surface on the information display surface side of the LED information display panel with a snow melting function, or the outermost surface on the information display surface side, etc. It has a function to melt the snow that snowed. The function of the second metal wiring portion 4b relating to the present embodiment to generate heat will be described later.

  In the LED information display panel 100 with a snow melting function of the present embodiment, as shown in FIG. 2, each LED mounting module 10 is accommodated in the accommodation sheet 2 individually in a straight line at a predetermined interval. ing. Each LED mounting module 10 may be electrically connected to an internal control unit including the relay base 6 and the driver 7 by the flexible wiring 4 embedded in the accommodation sheet 2.

  The LED information display panel 100 with the snow melting function may be configured with the LED information display device 200 by being connected to necessary equipment in addition to the external operation base 8 as necessary. The LED information display device 200 may be such that the LED information display panel 100 with a snow melting function is self-supported by various auxiliary devices (not shown) as necessary, or is attached to the surface of the wall of the installation location. It is mainly used as an information display device installed non-permanently outdoors.

  The LED information display panel 100 with a snow melting function may have a structure that can be folded in such a manner that the unit parts including the individual LED mounting modules 10 are stacked at the time of transportation or storage. The folding method is not limited to a specific folding method except that it is the above-described mode. However, when the LED information display panel 100 with a snow melting function connects three or more LED mounting modules 10, ninety-nine. It is preferable to have a structure that can be folded. Ninety-nine folds refers to a structure in which a plurality of face pieces are connected to each other, and the adjacent face faces are folded so that the front surface-front surface and the back surface-back surface overlap in order.

[LED mounting module]
As shown in FIGS. 3 to 4, the LED mounting module 10 constituting the LED information display panel 100 with a snow melting function is formed by forming a first metal wiring portion 4 a on a flexible support substrate 11 made of a resin sheet or the like. It is a light emitting member formed by mounting LED elements 3 in a matrix on the LED element substrate 1.

(LED element substrate)
The LED element substrate 1 is a member for internal wiring in which a first metal wiring portion 4a for mounting the LED element 3 on a flexible support substrate 11 is formed. The first metal wiring portion 4a is formed on the surface of the support substrate 11 having flexibility at least on the information display surface side.

  In addition, the LED element substrate 1 according to the present embodiment has a first metal wiring portion 4a capable of conducting the LED element 3 on the other side of the flexible support substrate 11 where the LED element 3 is not mounted. A second metal wiring portion 4b different from the above is newly formed. When the second metal wiring portion 4b is energized, the second metal wiring portion 4b itself generates heat. Then, heat is transferred to the flexible support substrate 11 that is in direct contact with the second metal wiring portion 4b. Heat is transmitted to the outermost surface of the LED information display panel 100 with a snow melting function by transferring heat to the flexible support substrate 11. By transferring heat to the outermost surface of the LED information display panel 100 with a snow melting function, it is possible to prevent snow from forming on the outermost surface of the LED information display panel 100 with a snow melting function or to melt the snow that has snowed. In the present specification, the snow melting function is a concept that includes not only a function of melting snow that has snowed, but also a function of preventing snow formation on the outermost surface of the LED information display panel 100 with a snow melting function.

  As described above, the second metal wiring portion 4b has a function of generating heat when energized. Moreover, more heat can be generated by increasing the electrical resistance value of the second metal wiring portion 4b. In order to increase the electrical resistance value of the second metal wiring portion 4b, for example, the line width or film thickness of the second metal wiring portion 4b may be reduced. By reducing the line width or the film thickness of the second metal wiring part 4b, the cross-sectional area of the second metal wiring part 4b is reduced, so that the electrical resistance value of the second metal wiring part 4b can be increased.

  The first metal wiring portion 4a capable of conducting the LED element 3 and the second metal wiring portion 4b having a snow melting function may have a structure capable of realizing a function to be performed by each metal wiring portion. For example, the structure of each metal wiring part is not limited. A structure in which the first metal wiring part 4a and the second metal wiring part 4b can be connected in series, and the first metal wiring part 4a and the second metal wiring part 4b are connected by one power source or the like. The first metal wiring part 4a and the second metal wiring part 4b can be independently conducted in parallel, and the first metal wiring part 4a and the second metal wiring part 4b are A structure in which each is independently connected by a power source or the like may be used. If the first metal wiring part 4a and the second metal wiring part 4b are connected to each other independently by a power source or the like, the first metal wiring part 4a is optimally adapted to emit light from the LED element. It is possible to energize the second metal wiring portion 4b so that the snow melting function is optimized.

Although the metal used as a material of the 2nd metal wiring part 4b is not restrict | limited in particular, For example, aluminum, gold | metal | money, silver, copper etc. can be illustrated. The metal constituting the second metal wiring portion 4b preferably has a thermal conductivity λ of 200 W / (m · K) to 500 W / (m · K), preferably 300 W / (m · K) to 500 W / (m · K). The following is more preferable. The electric resistivity R of the metal constituting the second metal wiring portion 4b is preferably 3.00 × 10 ⁻⁸ Ω · m or less, and more preferably 2.50 × 10 ⁻⁸ Ω · m or less. Here, the measurement of the thermal conductivity λ can use, for example, a thermal conductivity meter QTM-500 manufactured by Kyoto Electronics Industry Co., Ltd., and the measurement of the electrical resistivity R can be performed, for example, a 6517B type electrometer manufactured by Keithley. Can be used. According to this, for example, in the case of copper, the thermal conductivity λ is 403 W / (m · K), and the electrical resistivity R is 1.55 × 10 ⁻⁸ Ω · m. By setting the line width and film thickness of the second metal wiring portion 4b within the following ranges, the electric resistance value of the second metal wiring portion 4b can be increased.

  The second metal wiring portion 4b is preferably a copper wiring portion having a line width of 5 μm or more and 50 μm or less, and more preferably a copper wiring portion having a width of 10 μm or more and 20 μm or less. Since the second metal wiring portion 4b is a copper wiring portion having a line width of 5 μm or more, the risk of disconnection that may occur in the second metal wiring portion 4b can be reduced, and the second metal wiring has good durability. It can be set as the part 4b. Since the second metal wiring portion 4b is a copper wiring portion having a line width of 50 μm or less, the electric resistance value can be increased to the extent that heat generation of the second metal wiring portion 4b is facilitated. Therefore, heat can be generated in the second metal wiring portion 4b with smaller power consumption.

  The film thickness of the second metal wiring part 4b is preferably 10 μm or more and 75 μm or less, and more preferably 12 μm or more and 35 μm or less. When the film thickness of the second metal wiring part 4b is 10 μm or more, the risk of disconnection that may occur in the second metal wiring part 4b can be reduced, and the second metal wiring part 4b has good durability. be able to. By setting the film thickness of the second metal wiring portion 4b to 75 μm or less, it is possible to increase the electric resistance value to the extent that heat generation of the second metal wiring portion 4b is facilitated. Therefore, heat can be generated in the second metal wiring portion 4b with smaller power consumption. In addition, the LED element substrate 1 in which the metal wiring portion is formed on the flexible support substrate can maintain sufficient flexibility, and the handling property can be prevented from being lowered due to an increase in weight.

  The ratio of the area of the second metal wiring portion 4b to the area of the flexible support substrate 11 (hereinafter sometimes referred to as the second metal coverage) is preferably 2% or more and 30% or less, More preferably, it is 5% or more and 10% or less. When the second metal coverage is 2% or more, the risk of disconnection that may occur in the second metal wiring portion 4b can be reduced, and the second metal wiring portion 4b having high durability can be obtained. . When the second metal coverage is 30% or less, the electric resistance value can be increased to the extent that heat generation of the second metal wiring portion 4b is facilitated. Therefore, heat can be generated in the second metal wiring portion 4b with smaller power consumption.

  On the other hand, the 1st metal wiring part 4a is a wiring pattern which makes the LED element 3 conductive. Arrangement | positioning of the 1st metal wiring part 4a will not be limited to a specific arrangement | positioning etc., if it is the arrangement | positioning which can mount the LED element 3 in matrix form. The ratio of the area of the first metal wiring portion 4a to the area of the flexible support substrate (hereinafter sometimes referred to as the first metal coverage) is preferably 60% or more and 98% or less, and 80 % To 95% is more preferable. When the first metal coverage is 60% or more, it is possible to improve heat dissipation on the surface side where the first metal wiring portion 4a of the flexible support substrate is formed. Therefore, the heat generated by conducting the second metal wiring portion 4b is released from the surface side where the first metal wiring portion 4a is formed through the support substrate, and heat is applied to the outermost surface of the LED information display panel with a snow melting function. Can be communicated. Therefore, it is possible to prevent snow on the outermost surface of the LED information display panel with a snow melting function or to melt the snow that has snowed. When the first metal coverage is 98% or less, a wiring pattern that allows the LED element 3 to conduct can be appropriately formed.

  Although the metal used as a metal material which comprises the 1st metal wiring part 4a is not restrict | limited in particular, For example, aluminum, gold | metal | money, silver, copper etc. can be illustrated. By using these metals, both heat dissipation and electrical conductivity can be achieved. More specifically, since the heat dissipation from the LED element 3 is stabilized and an increase in the electrical resistance value can be prevented, the variation in light emission between the LEDs is reduced, and the LED element 3 can stably emit light. The life of 3 is also extended. Furthermore, since deterioration of peripheral members such as a substrate due to heat can be prevented, the product life of the image display device itself incorporating the LED element substrate 1 as a backlight can be extended.

  The first metal wiring portion 4a and the second metal wiring portion 4b are formed by laminating a metal plate and a flexible support substrate 11 via an adhesive, and etching the first metal wiring portion 4a and the second metal wiring portion 4b from the metal plate. By forming the second metal wiring portion 4b, the support substrate 11 on which the first metal wiring portion 4a and the second metal wiring portion 4b are formed is manufactured. Therefore, since the second metal wiring part having a snow melting function can be formed by a very simple method, it is manufactured at an extremely low cost as compared with the LED information display panel with a snow melting function provided with a new mechanism such as a snow melting unit. There is a merit in that it can be done.

(Support substrate)
The support substrate 11 constituting the LED element substrate 1 is a flexible support substrate mainly made of a resin such as a resin film. Since the support substrate 11 has flexibility, the LED element substrate 1 becomes a flexible substrate. Therefore, even when the installation location is a wall surface including a curved surface, the LED information display panel with a snow melting function can be installed following the curved surface. In addition, the risk of scratching or breaking the storage sheet due to contact with the LED mounting module can be greatly reduced.

  Further, by using a flexible support substrate as the support substrate, the heat generated by the conduction of the second metal wiring portion 4b is passed through the flexible support substrate and the flexible support substrate 11 is made. This can be transmitted to the surface side on which the first metal wiring portion 4a is formed.

  Preferable examples of the material resin of the support substrate 11 having flexibility include polyimide (PI), polyethylene naphthalate (PEN), amorphous polyarylate, polysulfone, polyethersulfone, polyphenylene sulfide, polyetheretherketone, Examples include polyetherimide, fluororesin, and liquid crystal polymer. Among these, polyethylene naphthalate (PEN) whose heat resistance and dimensional stability are improved by performing a heat resistance improvement treatment such as an annealing treatment can be particularly preferably used. In addition, polyethylene terephthalate (PET) whose flame retardancy is improved by addition of a flame retardant inorganic filler or the like can also be selected as a material resin for the resin base.

  The thickness of the support substrate 11 having flexibility is not particularly limited, but is preferably 30 μm or more and 200 μm or less, and more preferably 50 μm or more and 125 μm or less. When the thickness of the flexible support substrate 11 is 30 μm or more, the support substrate can be a flexible support substrate that is preferable in terms of heat resistance and insulation. If the film thickness of the flexible support substrate is 200 μm or less, the LED information display panel can be formed through the flexible support substrate even if the heat generated in the second metal wiring portion 4b is small. Can communicate to the surface. Therefore, heat can be transmitted to the outermost surface of the LED information display panel and the like with less power consumption. In addition, it is possible to maintain good productivity when manufacturing by the roll-to-roll method.

(LED element)
The LED element 3 constituting the LED mounting module 10 by being mounted on the LED element substrate 1 is a light emitting element utilizing light emission at a PN junction where a P-type semiconductor and an N-type semiconductor are joined. There are proposed a structure in which a P-type electrode and an N-type electrode are provided on the upper and lower surfaces of the element and a structure in which both the P-type and N-type electrodes are provided on one side of the element. The LED element 3 can be preferably bonded to the metal wiring portion of the LED element substrate 1 by solder bonding. This solder bonding can be performed by a reflow method or a laser method.

(Solder layer)
In the LED element substrate 1, the first metal wiring portion 4 a and the LED element 3 are preferably bonded through the solder layer 5. This joining by soldering can be performed by, for example, a reflow method or a laser method.

(Back side reinforcement plate)
In the LED information display panel 100 with a snow melting function, it is preferable that a back-side reinforcing plate 14 is further laminated on the back side of the support substrate 11 in addition to the above members. As the back side reinforcing plate 14, for example, a sheet or panel made of polycarbonate, acrylic, aluminum, or the like can be preferably used.

(Diffusion plate)
In addition, in the LED information display panel 100 with a snow melting function, a diffusion plate 15 may be further disposed in any layer above the light emitting surface of the LED element, if necessary. The diffuser plate 15 has a function of uniformly diffusing emitted light from the LED element 3 serving as a light source and reducing variations in luminance. Any conventionally known various optical films can be used without particular limitation as long as they have optical characteristics that impart a diffusing action to incident light. For example, an optical film or the like in which a minute and random lens array is formed on the entire surface in order to exert a light diffusing function on a translucent resin film made of polycarbonate, acrylic resin or the like is a specific example of the diffusing plate 15. Can be mentioned.

[Containment sheet]
The accommodation sheet 2 can stably accommodate one or a plurality of LED mounting modules 10 connected to each other, and the LED mounting module accommodated therein during use of the LED information display panel 100 with a snow melting function. 10 is a storage sheet that protects 10. The housing sheet 2 uses two resin sheets as the display surface side resin sheet 21 and the back surface side resin sheet 22 respectively, and superimposes them, so that one or a plurality of LED mounting modules 10 are stably placed between the two sheets. It forms by sealing the other part in the aspect which can hold | maintain LED mounting module 10 stably, forming the LED accommodating part which is the space which can be accommodated.

  The LED housing portion is a region where the display surface side resin sheet 21 and the back surface side resin sheet 22 are regions other than those necessary for housing the LED mounting module 10, in order to house the LED mounting module 10. In a region including a connecting portion formed between necessary regions, the sealing portion 23 is formed in close contact with each other, thereby forming a bag-shaped cavity portion surrounded by the sealing portion 23. As described above, the connecting portion of the storage sheet 2 is the sealing portion 23 that seals the LED mounting module 10 by bringing the display surface side resin sheet 21 and the back surface side resin sheet 22 into close contact with each other in the storage sheet 2. Among the portions, the sealing portion is formed between the plurality of LED mounting modules 10 and is a portion that can be folded when folded.

  As shown in FIG. 4, in the display surface side resin sheet 21, an area surrounding at least a matrix area where the LED elements 3 are mounted, that is, an area on the area where information is displayed by turning on the LED elements 3 is displayed. Although it is good also as an opening area | region where the surface side resin sheet 21 does not exist, it is preferable to form the said area | region part of the display surface side resin sheet 21 with the transparent film 211 with high light transmittance. Or in the part on this information display area, it may replace with the display surface side resin sheet 21, and may arrange | position a separate transparent member alternatively.

  As the resin sheet constituting the storage sheet 2, a known resin sheet made of soft plastic such as vinyl chloride, acrylic, styrene, or the like can be used as appropriate. However, in the LED information display panel 100 with a snow melting function of the present invention, it is particularly preferable to use vinyl chloride from the viewpoint that the curvature radius of the bent portion at the time of folding can be easily made sufficiently small. In addition, in order to provide the other desired physical property as needed, the accommodation sheet 2 may be coated or colored.

<LED information display device>
By connecting the LED information display panel 100 with a snow melting function described above to the external operation base 8, the LED information display device 200 including the LED information display panel 100 with a snow melting function as an information display unit can be obtained.

  The LED information display device 200 is configured such that the LED information display panel 100 with a snow melting function is self-supported by various auxiliary devices (not shown) as needed, or is attached to the surface of the wall of the installation location. It is practically used.

  The external operation base 8 is a component / device having a function of controlling the lighting timing, lighting time, etc. individually for each LED element 3 mounted on each LED mounting module 10. For example, timing control Can be realized as an executable program such as a ROM on which a program is executed as a program, a substrate on which the algorithm is mounted as an IC chip, and the like. Although this whole control part can also be made to provide in an edge part as a system different from the connection part of LED mounting module 10, for example, according to ease of use, there is no limitation in particular in an arrangement position.

  As described above, the LED information display panel with snow melting function and the LED information display device of the present invention have no new mechanism such as a snow melting unit, and the outermost surface on the information display surface side of the LED information display panel with snow melting function. LED information display panel with a snow melting function and an LED information display device provided with a snow melting mechanism that can melt snow that has snowed on the outermost surface on the information display surface side or the like.

DESCRIPTION OF SYMBOLS 1 LED element substrate 2 Storage sheet 21 Display surface side resin sheet 211 Transparent film 22 Back side resin sheet 23 Sealing part 3 LED element 4 Metal wiring part 4a 1st metal wiring part 4b 2nd metal wiring part 5 Solder layer 6 Relay Base 7 Driver 8 External operation base 10 LED mounting module 11 Support substrate 12 Spacer 13 Black layer 14 Back side reinforcing plate 15 Diffusion plate 16 LED display unit 100 LED information display panel with snow melting function 200 LED information display device

Claims (5)

On one surface side of the flexible support substrate, the LED element mounted on the support substrate via a first metal wiring part capable of conducting the LED element,
The LED information display panel with a snow melting function, wherein a second metal wiring portion having a smaller cross-sectional area than the first metal wiring portion is formed on the other surface side of the support substrate. The first metal wiring portion and the second metal wiring portion can be electrically connected in series, and the first metal wiring portion and the second metal wiring portion are connected by a single power source. Item 2. An LED information display panel with a snow melting function according to Item 1. Said support substrate according to claim 1 or snow melting function with LED information display panel according to 2 which is 200μm or less of the resin over the film thickness 30 [mu] m. The first metal coverage, which is the ratio of the area of the first metal wiring portion to the area of the support substrate in the first metal wiring portion region, is 60% or more and 98% or less,
The second metal coverage, which is a ratio of the area of the second metal wiring part to the area of the support substrate in the second metal wiring part region, is 2% or more and 30% or less, according to any one of claims 1 to 3. LED information display panel with snow melting function as described. LED information display device including an LED information display panel with snow melting function according as an information display unit in any one of claims 1 to 4.

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