JP2010181721A - Led emission display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED emission display device that is suitable for thinning and simplifying the whole device, has high waterproofness, changes the directivity characteristic of irradiation light, and is suitable for development to various purposes. <P>SOLUTION: In this LED emission display device 1, surface mount type LEDs 2 formed by integrally molding light emitting elements of three colors of RGB are arranged in a dot matrix shape on the surface of a substrate 3, and the substrate 3 is attached to the front surface of a back frame 4. A lens case 6 of a watertight shape where lens sections 61 overlaid on each front surface of the surface mount type LEDs 2 are integrally formed of translucent resin is replaceably attached to the front surfaces of the substrate 3 and back frame 4 so that the peripheral wall section 63 thereof covers the outside of the substrate 3 and back frame 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LED light-emitting display device that displays various characters and images by controlling lighting of a large number of LED (light-emitting diode) elements arranged in a dot matrix.

  A technique is known in which a large number of two-dimensionally arranged LEDs are used as a light emitting unit for a lighting device or a display device. In recent years, full-color type LED light-emitting display devices that emit mixed colors using LED elements capable of high-luminance light emission of red (R), green (G), and blue (B) are becoming widespread. It is also used for large-sized video display devices.

  As a basic configuration of this type of LED light-emitting display device, for example, as disclosed in Patent Document 1 related to the application of the present applicant, a bullet-type LED is mounted on the surface of a substantially flat mounting board, In general, an LED array panel is configured by arranging in a dot matrix of a plurality of vertical and horizontal matrixes.

JP 2002-328652 A

  In the conventional LED array panel using a bullet-type LED, the height of the LED lamp portion (lens portion) itself is 10 to 15 mm, and it is difficult to make the entire apparatus thin. Furthermore, since the electrode (lead frame) of each bullet-type LED penetrates the board and is connected to the back surface of the board, a spatial restriction is increased when electronic components are arranged on the back side of the board. . Therefore, the substrate is divided into two pieces, that is, an LED mounting substrate and an LED driving substrate, and this point is also a factor that hinders the simplification and compactness of the structure of the entire apparatus.

  In addition, when using the conventional LED array panel in an outdoor display device or the like, a thermosetting fluid resin is filled between the bullet-type LED and the substrate between the bullet-type LED and the substrate because of the need for waterproofing. In many cases, the water tightness of the LED array panel is ensured. However, since the filling operation of the thermosetting fluid resin has a large burden in terms of cost and safety (volatility, odor, toxicity, etc.), it is desired to realize a waterproof structure that does not depend on resin filling as much as possible.

  Further, according to the conventional LED array panel, the directivity characteristic of the irradiation light is individually determined by the shape of the bullet-shaped resin lens for molding the LED element. That is, since the use of the LED array panel is generally limited at the manufacturing stage of the LED array panel, it is substantially difficult to cope with the use of the LED array panel for various purposes.

  The present invention has been made in view of the circumstances as described above, and can reduce the thickness of the entire device and simplify the structure, and ensure good waterproofness regardless of filling with thermosetting fluid resin. Furthermore, an object of the present invention is to provide an LED light-emitting display device that can change the directional characteristics of irradiation light and is suitable for multipurpose development.

  In order to achieve the above-described object, the LED light-emitting display device of the present invention includes surface-mounted LEDs in which RGB three-color light-emitting elements are integrally molded, arranged in a dot matrix on the surface of a substrate, The substrate is attached to the front surface of the back frame, and the lens portion superimposed on the front surface of each of the surface-mounted LEDs is integrally formed of a translucent resin. It is characterized by being exchangeably attached to the front surface of the substrate and the back frame so as to cover the outside of the substrate and the back frame.

  Since the LED light-emitting display device according to this configuration uses a surface-mount type LED instead of a bullet-type LED, only one board is required for disposing it, reducing the number of parts, and the entire device It is easy to reduce the thickness.

  In addition, the water-tight lens case that covers the front surface of the substrate and the back frame can be waterproofed without filling the LED disposed on the substrate with the thermosetting fluid resin, so that the substrate can be waterproofed. It is advantageous in terms of surface and the use in the outdoors is expanded. Furthermore, by making this lens case interchangeable, the directivity characteristics of the irradiation light can be changed, so that it becomes easier to deal with multiple uses.

  In the above configuration, a shading plate for light shielding may be provided between each stage of the lens portion in the lens case, thereby further improving the visibility even in bright outdoors. The cover plate may be molded integrally with the lens case on the front surface of the lens case, but a shading louver framed with multiple cover plates is formed separately from the lens case and replaced with the front surface of the lens case. You may attach freely.

  The LED light-emitting display device of the present invention configured as described above can reduce the thickness of the structure around the substrate by using a surface-mounted LED, and covers a substrate with a watertight lens case. As a result, good waterproofness is ensured, and it is also easy to change the directivity of irradiated light by exchanging the lens case. These effects will greatly expand the use especially in the outdoors.

It is a disassembled perspective view (front side) which shows the whole structure of the LED light emission display apparatus which concerns on embodiment of this invention. It is a disassembled perspective view (back side) which shows the whole structure of the LED light emission display apparatus. It is a front view (also sectional position guide diagram) of the LED light emitting display device. It is a rear view of the LED light emitting display device. It is a top view of the LED light emitting display device. It is a bottom view of the LED light emitting display device. It is a right view of the LED light emitting display device. It is AA sectional drawing of the LED light emission display apparatus. It is BB sectional drawing of the LED light emission display apparatus. It is the elements on larger scale which show the detailed shape of the lens case and light-shielding louver in the LED light-emitting display apparatus, Comprising: It is the front view (also cross-sectional position guide diagram) of the part which cut out the area | region equivalent to every two length and width is there. It is a rear view of the cutout part. It is a top view of the cutout part. It is a bottom view of the cutout part. It is a right view of the cutout part. It is CC sectional drawing of the cutout part. It is DD sectional drawing of the cutout part.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are exploded perspective views showing an overall configuration of an LED light emitting display device according to an embodiment of the present invention. FIGS. 3 to 7 are external views of the LED light emitting display device, and FIGS. It is sectional drawing similarly. FIGS. 10 to 14 are partial enlarged views showing the detailed shapes of the lens case and the light shielding louver, each of two vertical and horizontal lens portions arranged in a row (horizontal) direction and a column (vertical) direction. The figure which cut out the area | region and showed the external appearance of this cut-out part, FIG.15 and FIG.16 is sectional drawing of this cut-out part similarly.

  The main members constituting the LED light-emitting display device 1 of the present invention are superimposed on a substrate 3 on which a large number of LEDs 2 are arranged in a matrix, a back frame 4 holding the substrate 3, and a back side of the back frame 4. 5 members including a packing 5, a lens case 6 attached to the front surface of the back frame 4, and a light shielding louver 7 attached to the lens case 6 in an overlapping manner.

  In the present invention, a so-called 3 in 1 type surface-mounted multichip LED is used as the LED 2 that is a light emitting element. This surface-mount type multichip LED is obtained by mounting light emitting elements of three colors RGB in a package molded of ceramic or resin, and integrally molding these light emitting elements with a resin such as epoxy or silicone. The surface-mounted multichip LED configured as described above enables RGB mixed color light emission within a small outer size compared to a bullet-type LED.

  The substrate 3 is a general printed wiring board in which a conductive pattern constituting a lighting drive circuit of the LED 2 is formed by means such as etching on the surface of a copper clad laminate having, for example, a glass fiber reinforced epoxy resin as a base material. Three pairs of electrodes (not shown) corresponding to RGB colors are exposed on the opposite side surfaces of the LED 2 package, and these electrodes are soldered to the surface of the substrate 3. In the illustrated embodiment, 16 LEDs 2 in the row (lateral) direction × 16 (column) (vertical) directions are arranged on the front surface (front surface) of the substrate 3 formed in a substantially square shape when viewed from the front. They are arranged at an appropriate interval. Screw insertion holes 31 are formed at the four corners of the substrate 3.

  According to this configuration, since the connection between the LED 2 and the substrate 3 is completed only on the front surface of the substrate 3, there is no need to form a through hole or the like for inserting the lead frame of the LED 2 in the substrate 3, and the LED 2 and the substrate 3 is greatly simplified in the cross-sectional structure around the connection region with 3. Therefore, electronic components or the like that have been conventionally mounted on an LED drive board separate from the LED mounting board can be directly disposed on the back surface of the board 3, thereby further reducing the thickness of the entire apparatus. . 2, 4, 8, and 9, the back surface of the substrate 3 is shown. However, in order to prevent complication of the drawings, the electronic components and the like disposed on the back surface of the substrate 3 are shown in these drawings. The expression of is omitted.

  The substrate 3 on which the LEDs 2 are arranged as described above is attached so as to overlap the front surface of the back frame 4. The back frame 4 is a molded product made of, for example, polycarbonate resin, and has a back frame portion 41 having a large opening at the center portion, and an outer peripheral rib projecting forward from the outer peripheral edge of the back frame portion 41 with a certain protruding dimension. 42. As shown in FIGS. 8 and 9, in the exemplary embodiment, the outer dimension of the outer peripheral rib 42 in the back frame 4 matches the outer dimension of the substrate 3, and the peripheral portion of the substrate 3 and the outer peripheral rib 42. Both members are overlapped with each other so as to contact the front edge of the two. Substantially cylindrical screw insertion portions 43 are formed at the four front corners of the back frame portion 41. By inserting mounting screws (not shown) from the back side of the rear frame 4 into the screw insertion portions 43, the rear frame 4, the substrate 3 and the lens case 6 can be overlapped and joined.

  Note that, as a modification example regarding the overlapping form of the substrate 3 and the back frame 4, the outer peripheral rib 42 of the rear frame 4 is formed slightly larger than the outer dimension of the substrate 3, and corresponds to the thickness of the substrate 3 inside the outer peripheral rib 42. It is also possible to combine these in a state where the substrate 3 is dropped inside the back frame 4 by providing a step or the like.

  On the back side of the substrate 3, cables for power lines and signal lines are connected via connectors (not shown), and these cables are routed to the outside through the opening of the back frame 4.

  On the inner peripheral edge of the opening formed in the back frame portion 41, a rear projecting portion 44 protruding rearward is formed. As shown in FIGS. 8 and 9, the rear projecting portion 44 is fitted into an installation opening (not shown) or the like formed in advance on the installation surface S of the LED light emitting display device 1, and installed on the installation surface. It is used for coupling with various parts and members arranged behind S. In the illustrated embodiment, the installation surface S is made of a flat sheet metal member or the like, and a mounting opening having a substantially square shape in front view is formed on the surface thereof in accordance with the arrangement interval of the LED light emitting display device 1.

  The rear frame 4 is fixed to the installation surface S by appropriate fixing means in a state where the rear projecting portion 44 is fitted into the mounting opening of the installation surface S. In the illustrated embodiment, thick leg portions 45 having a substantially oval shape in front view and having female screw holes are formed at four positions in the back frame portion 41 of the back frame 4 in the vicinity of the screw insertion portion 43. When the back frame 4 is applied to the installation surface S, the thick leg 45 abuts on the installation surface S. The back frame 4 is fixed to the installation surface S by screwing a fixing screw into the female screw hole of the thick leg portion 45 from the back side of the installation surface S.

  A packing 5 is interposed between the back frame 4 and the installation surface S in order to ensure watertightness between the two members. The packing 5 is a flexible member made of synthetic rubber, polymer elastomer, or the like, and has a rectangular frame shape in front view along the back frame portion 41 of the back frame 4. In the illustrated embodiment, an oblong hole 51 for inserting the thick leg 45 is formed at a position matching the thick leg 45 of the back frame 4. Also, substantially cylindrical projections 52 are formed at the four corners on the front side of the packing 5. The projections 52 are fitted into openings on the back side of the screw insertion portions 43 formed at the four corners of the back frame 4 to waterproof the mounting screws.

  The lens case 6 is a molded product made of a translucent resin such as methacrylic resin, for example, and the front shape of the lens case 6 also has a square shape that substantially matches the substrate 3 and the back frame 4. On the front surface of the lens case 6, a substantially egg-shaped lens portion 61 whose rear end forms a flat surface is arranged in a row direction × 16 column direction in accordance with the arrangement of the LEDs 2 mounted on the substrate 3. Has been. The gap between the adjacent lens parts 61 is sealed without gaps by the flat part 62 having a substantially constant thickness. The flat part 62 is formed at a position slightly behind the middle of the depth of the lens part 61 and near the maximum diameter of the lens part 61.

  A peripheral wall portion 63 that protrudes rearward at a certain depth is formed integrally with the flat portion 62 on the four circumferences of the assembly of the lens portions 61 that are integrally coupled via the flat portion 62. Thereby, the lens case 6 forms a transparent cover shape whose front side is watertight as a whole. The inner dimensions of the back space surrounded by the peripheral wall 63 substantially match the outer dimensions of the substrate 3 and the back frame 4 described above. Then, the lens case 6 is superimposed on the front of the substrate 3 and the back frame 4 so that the peripheral wall 63 is placed on the outside of the substrate 3 and the back frame 4. Near the center and the four corners of the lens case 6, a bottomed substantially cylindrical female screw portion 64 that opens only to the rear is formed, and a screw (screwed into the female screw portion 64 from the back side of the back frame 4 ( (Not shown), these members are joined together.

  Thus, a waterproof structure in which the watertight lens cover 6 is covered on the front surface of the substrate 3 on which the LED 2 is mounted is obtained. The above-described packing 5 also functions as a watertight member for a contact surface between the peripheral wall portion 63 of the lens cover 6 and the outer peripheral rib 42 of the back frame 4 as shown in FIGS. In the present invention, the portion where the lens cover 6 and the rear frame 4 are joined and the portion where the rear frame 4 and the installation surface S are joined can be slightly deformed as long as the moldability and strength of each member are not impaired. Accordingly, the cross-sectional shape of the packing 5 is appropriately designed so that the watertightness of each joint portion can be satisfactorily secured.

  10 to 16, the lens unit 61 according to the exemplary embodiment is slightly flat when viewed from the front so that the light collecting property in the vertical direction is slightly stronger than the light collecting property in the left-right direction. Is formed. Further, the longitudinal cross-sectional shape of the lens portion 61 is a convex shape in which the condensing axis is obliquely downward with respect to the horizontal plane, and consideration is given to particularly improving the visibility when looking up from below.

  The light distribution characteristic of the light emitted from the LED 2 is determined by the cross-sectional shape and refractive index of the lens unit 61. The lens case 6 according to this configuration is detachable from the substrate 3 and the back frame 4, so that the substrate Even without changing the LED 3 or the LED 2, the light distribution characteristics of the LED 2 can be changed by replacing only the lens case 6. Since the lens case 6 is attached to the substrate 3 and the back frame 4 using screws screwed from the back side of the back frame 4, the lens case 6 can be easily replaced without impairing watertightness with respect to the front. Accordingly, by selecting and exchanging only the lens case 6 according to the application while sharing the substrate 3, the LED 2, and the back frame 4, the application of the present apparatus can be extended without difficulty even outdoors.

  Further, on the front surface of the lens case 6, a light shielding louver 7 having a substantially square shape in front view substantially matching the lens case 6 is attached in an overlapping manner. The light shielding louver 7 is a molded product made of, for example, polycarbonate resin or aluminum alloy, and the surface thereof is black or other light absorbing surface. The front plate 71 of the light shielding louver 7 is formed with 16 window holes in the row direction and 16 window directions in the column direction in accordance with the position of the lens part 61 protruding forward of the lens case 6. Are inserted into each lens unit 61 individually. Furthermore, ribs 72 extending in the column direction are formed on the front plate 71 every two rows in the row direction of the window holes.

  Moreover, the saddle plate 73 which protrudes ahead from the upper direction of a window hole is formed for every line of a window hole. The saddle plate 73 has a tapered cross section that becomes thinner from the base end toward the front end. The cover 73 prevents the sunlight from directly hitting the LED 2, enhances the contrast at the time of lighting, and increases the visibility of the display screen. In the illustrated embodiment, each slat 73 is slightly inclined forward and downward in consideration of visibility when looking up from below. Further, in the vicinity of the base end of each gutter plate 73, an opening 74 having a substantially arcuate shape when viewed from above is formed so as to straddle two lens portions 61 adjacent in the row direction. This arcuate opening 74 is a drain for preventing rainwater from collecting between the roof plates 73.

  The light shielding louver 7 may be formed integrally with the lens case 6 in advance. However, in the exemplary embodiment, the light shielding louver 7 is formed separately from the lens case 6 and is attached to the lens case 6 in a replaceable manner. . The lens case 6 is attached by elastically fitting engagement claw pieces 75 projecting rearward from the upper and lower edges of the light shielding louver 7 into engagement groove portions 65 formed on the upper and lower surfaces of the lens case 6. To do. According to this mounting structure, the watertight surface formed on the front surface of the lens case 6 is not impaired. The cross-sectional shape of the cover 73 is preferably changed as appropriate according to the installation location and application of the LED light emitting display device 1, but the light shielding louver 7 can be replaced in the same manner as the lens case 6. The light characteristics can be further diversified, and the application of the LED light emitting display device 1 can be further expanded.

  It should be noted that the above-described embodiment is an example, and it is needless to say that the present invention can be modified to some extent without departing from the gist thereof.

1 LED light-emitting display device 2 Surface-mount LED
3 Substrate 4 Back frame 5 Packing 6 Lens case 61 Lens part 63 Peripheral wall part 7 Light shielding louver 73 Gutter plate

Claims (2)

  Each of the surface mount LEDs is a surface mount type LED in which RGB three-color light emitting elements are integrally molded, arranged in a dot matrix on the surface of the substrate, and the substrate is attached to the front surface of the rear frame. A watertight lens case in which a lens portion superimposed on the front surface of the substrate is integrally formed of a translucent resin, with its peripheral wall portion covering the outside of the substrate and the back frame, An LED light-emitting display device which is attached to the front face in a replaceable manner.   2. The LED light-emitting display device according to claim 1, wherein a shielding plate is provided between each stage of the lens portion in the lens case.

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