JP2011065062A - Internal illumination-type signboard and method for managing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal illumination-type signboard, wherein difference in illuminance on a display screen can be minimized even when a fault occurs in an LED panel and the size of a power source device is made small. <P>SOLUTION: The internal illumination-type signboard includes: a translucent display screen on the surface of which an image is displayed; a support base attachably/detachably supporting the display screen; a surface lighting device which is configured such that a plurality of long LED panels on which a plurality of LEDs are arrayed in a first direction are arranged in a second direction perpendicular to the first direction, and which is fixed to the support base and illuminating the display screen from the rear side; and a power source device supplying electric power to the plurality of LED panels of the surface lighting device via a breaker. A plurality of groups are created with two or more LED panels that are not adjacent to each other as one group, and the breaker is provided so as to correspond to each of the plurality of groups. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides an internally illuminated signboard that illuminates a display screen on which an image as a signboard is displayed from the inner side (the back side of the image display surface) so that information such as advertisements can be transmitted even at night, etc. It relates to the management method.

  Conventionally, a fluorescent lamp or the like has been used as an illumination light source for an internally illuminated signboard, but in recent years, as disclosed in Patent Document 1, an LED (Light Emitting Diode) that is excellent in terms of power consumption and lifespan. ) Has come to be used.

  Hereinafter, a conventional internally illuminated signboard and its problems will be described.

  FIG. 8 is a side conceptual view showing the configuration of a conventional internally illuminated signboard. The internally illuminated signboard 40 shown in the figure includes a display screen 42, a planar illumination device 44 that illuminates the display screen 42 from the back side, a support base 46 that supports the display screen 42 and the planar illumination device 44, and a power supply device 48. And is composed of. As shown in FIG. 9, the planar illumination device 44 of this example includes eight LED panels 50 divided into 4 × 2 × 8 regions, and each LED panel 50 corresponds to each. The power supply device 48 is connected via a breaker 58.

  Here, when the LED panel 50 corresponding to the second region from the lower left side of the display screen 42 fails and the power supply to the failed LED panel 50 is interrupted by the breaker 58, as shown in FIG. The area of the display screen 42 corresponding to the failed LED panel 50 is not illuminated. In this case, the difference in illuminance between the area of the display screen 42 corresponding to the failed LED panel 50 and the other areas becomes more conspicuous as the size of the LED panel 50 per unit is larger.

  On the other hand, it is conceivable to improve the above problem by increasing the number of LED panels 50 and reducing the size of each LED panel 50. However, since the number of breakers 58 increases as the number of LED panels 50 increases, there is a problem that the size of the power supply device 48 that houses the breakers 58 increases. This problem becomes particularly serious as the size of the display screen 42 increases and the number of LED panels 50 increases.

  Further, the conventional internally illuminated signboard 40 has a problem that the distance between the display screen 42 and the planar illumination device 44 is not optimized. For example, when the distance between the two is very close, the display screen 42 corresponds to an irradiation image of each LED 56 constituting the LED panel 50 (corresponding to each LED which is a point light source) as shown by a black dot in FIG. Dot) is displayed as illuminance unevenness. On the other hand, when the distance between the two is increased, the illuminance decreases and the size of the internally illuminated signboard 40 increases (thickness increases).

  Furthermore, in the conventional internally illuminated signboard 40, when replacing the failed LED panel 50, the display screen 42 is removed and the LED panel 50 is replaced from the front side. However, for example, when a huge internally illuminated signboard 40 is installed in a limited installation space such as a rooftop advertising tower, there is no work space on the front side of the display screen 42, and the display screen 42 can be attached and detached. There was a problem that a crane car or the like was required, which took time and cost.

  Here, there are patent documents 2 to 4 as prior art documents relevant to the present invention.

Patent Document 2 relates to an internally illuminated light box in which a plurality of LEDs, which are point light sources, are modularized and arranged in a matrix. In the same document, the luminance when the incident angle of light emitted from the LED disposed in the housing recess is 0 ° and a distance of 350 mm is set to 15000 cd / m ² or less, thereby reducing the surface illuminance. It is disclosed to suppress the occurrence of unevenness.

  Patent Document 3 relates to a film-like or sheet-like surface light emitter incorporating an LED light source and an internally illuminated signboard using the surface light emitter. In this document, a wide-angle light emitting LED chip having a light emission angle of 60 ° to 120 ° is arranged evenly vertically and horizontally to form a surface light emitter, and the distance between the surface light emitter and the signboard image surface is separated according to the LED installation interval. Thus, it is disclosed to make the diverging light uniform.

  Patent Document 4 relates to a display device using a light emitting diode as a light source and the light source. In this document, as a light source unit, a block in which two LEDs and one constant current diode are connected in series is arranged in series on a strip-shaped substrate, and power can be supplied in parallel for eight blocks. , About 8 blocks, it is disclosed that the substrate can be cut and used in units of blocks.

Utility model registration No. 3095940 JP 2008-270144 A JP 2007-33662 A JP 2006-58828 A

The first object of the present invention is to provide an internally illuminated signboard that can reduce the difference in illuminance on the display screen as much as possible even when the LED panel fails, and can reduce the size of the power supply device. It is to provide.
In addition to the first object, the second object of the present invention further optimizes the distance between the display screen and the planar illumination device, and does not have uneven illuminance, so that the optimum illuminance can be obtained. It is to provide an internally illuminated signboard.
A third object of the present invention is to provide a management method for an internally illuminated signboard that can easily perform a replacement operation of a failed LED panel.

In order to achieve the above object, the present invention provides a translucent display screen having an image displayed on its surface,
A support base for detachably supporting the display screen;
A plurality of long LED panels in which a plurality of LEDs are arranged in a first direction are arranged in a second direction orthogonal to the first direction, fixed to the support base, and the display screen A planar illumination device that illuminates from the back side;
A power supply device that supplies power to the plurality of LED panels of the planar lighting device via a breaker,
A plurality of sets of two or more LED panels that are not adjacent to each other are created as one set, and the breaker is provided corresponding to each of the created sets. A signboard is provided.

Here, the plurality of LEDs are arranged in a matrix,
With the direction perpendicular to the display screen from the LED as an axis, a space where the light emitted from the LED spreads conically around the axis is a solid angle, and the light emitted from the LED in the display screen It is preferable that the display screen is arranged at a position where a space which expands in a conical shape with a solid angle when the relative luminous intensity becomes a predetermined value intersects between two LEDs located on a diagonal line.

  Moreover, it is preferable that the surface of each said LED panel in which the said LED is not arranged is being fixed with the panel fixing tool to the supporting member extended in the said 2nd direction of the said support base.

In addition, when the present invention replaces the LED panel of the internally illuminated signboard described above,
Removing the panel fixture of the LED panel to be replaced from the support member, moving the LED panel to be replaced in the first direction along the first direction, and removing it from the support base;
A new LED panel is moved along the first direction in the second direction opposite to the first direction, and is disposed at the position where the LED panel to be replaced is disposed. Provided is a method for managing an internally-illuminated signboard, which is fixed to the support member.

  According to the internally illuminated signboard of the present invention, even when the LED panel is partially turned off, the difference in illuminance on the display screen can be reduced as much as possible, and the number of breakers can be greatly reduced. The size of the power supply device can be reduced.

  Further, according to the internally illuminated signboard of the present invention, since the distance between the display screen and the planar illumination device is optimized, the optimum illumination can be obtained without uneven illumination, and the internally illuminated The size of the signboard can be reduced to the minimum optimized size (thickness).

  Furthermore, according to the management method of the internally illuminated signboard of the present invention, the replacement work can be easily performed even when there is no work space on the front side of the display screen. In addition, there is an advantage that a crane car or the like is unnecessary, and labor and cost can be reduced.

It is a side conceptual diagram of one embodiment showing composition of an internally illuminated signboard of the present invention. It is a conceptual diagram showing the structure of the surface by which LED of the planar illuminating device shown in FIG. 1 is arrange | positioned. It is a conceptual diagram showing the structure of the surface by which the LED of the planar illuminating device shown in FIG. 1 is not arrange | positioned. It is a conceptual diagram showing the structure of the LED module which comprises the LED panel shown in FIG. 2 and FIG. In the internally illuminated signboard shown in FIG. 1, it is a conceptual diagram showing a mode when one of LED panels fails. It is a graph showing the light distribution curve of LED which comprises the planar illuminating device shown to FIG. 2 and FIG. (A) And (B) is a conceptual diagram showing the relationship of the distance between a display screen and a planar illuminating device. It is a side conceptual diagram showing the structure of the conventional internally illuminated signboard. It is a conceptual diagram showing the structure of the planar illuminating device shown in FIG. FIG. 9 is a conceptual diagram showing a state when one of the LED panels fails in the internally illuminated signboard shown in FIG. 8. It is a conceptual diagram showing a mode when the distance between a display screen and a planar illuminating device is very near.

  Hereinafter, an internally illuminated signboard and a management method thereof according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

  FIG. 1 is a conceptual side view of an embodiment showing a configuration of an internally illuminated signboard according to the present invention. An internally illuminated signboard 10 shown in FIG. 1 includes a display screen 12, a planar illumination device 14, a support base 16, and a power supply device 18.

  The display screen 12 has a rectangular shape of a predetermined size having translucency for transmitting illumination light, and is detachably supported on the support base 16. Further, the display screen 12 is arranged at a predetermined interval from the surface on which the LEDs of the planar illumination device 14 are arranged (the left side surface of the planar illumination device 14 in FIG. 1). On the display screen 12, an image to be a signboard is displayed on the front surface (the left surface of the display screen 12). The image on the surface of the display screen 12 can be printed by, for example, an ink jet printer.

  The planar illumination device 14 is a rectangular planar light source having a size equivalent to the outer shape of the display screen 12 and configured by arranging a plurality of pseudo white LEDs 26 in a matrix, and is fixed to the support base 16. The planar illumination device 14 receives power supply from the power supply device 18 via the breaker 28 and illuminates the display screen 12 from the back surface side (the right surface of the display screen 12). Details of the planar illumination device 16 will be described later.

  As described above, the support base 16 serves as an installation base that supports the display screen 12 and the planar illumination device 14. As shown in FIG. 3, the support base 16 connects a rectangular frame 30 having the same size as the outer shape of the display screen 12 and the planar illumination device 14 and the vertical and horizontal sides of the frame 30. The support member 32 is arranged in this manner (in FIG. 3, the support member that connects the sides in the vertical direction is omitted) 32.

  The LED unit 24 can be selected from various types. For example, when the power is supplied from a DC (direct current) power source, the power supply 18 converts the AC (alternating current) power source into a DC (direct current) power source. It converts and supplies electric power (DC power supply) to the planar illumination device 14 via the breaker 28. On the other hand, when the LED unit 24 is of a type in which electric power is supplied from an AC (alternating current) power supply, the power supply device 18 may supply alternating current power from the commercial power supply or the like via the breaker 28 while maintaining an alternating voltage. Of course. In addition, the power supply device 18 includes a solar time switch (not shown), and supplies power in accordance with the sunset time, and interrupts the supply of power in accordance with the sunrise time. That is, the planar lighting device 14 is turned on in accordance with the sunset time and turned off in accordance with the sunrise time.

  Next, the planar illumination device 14 will be described in detail.

  FIG. 2 is a conceptual diagram showing the configuration of the surface (left surface in FIG. 1) on which the LEDs of the planar illumination device shown in FIG. 1 are arranged. As shown in the figure, the planar illumination device 14 is constituted by a plurality of long LED panels 20 extending in a first direction (vertical direction in FIG. 2). The plurality of LED panels 20 are arranged at equal intervals in a second direction (the left-right direction) orthogonal to the first direction.

  Each LED panel 20 is configured by arranging a plurality of LED modules 22 at equal intervals in the first direction, and each LED module 22 includes a plurality of LED units 24 as shown in FIG. , And arranged at equal intervals in the first direction. Furthermore, as shown in FIG. 4, the LED unit 24 is configured by arranging four LEDs 26 at equal intervals in a matrix form, two in each of the first and second directions.

  In the planar lighting device 14, a plurality of LED panels 20 are arranged at a predetermined interval in the second direction so that all the LEDs 26 are arranged at equal intervals. In each LED panel 20, a plurality of LEDs are arranged. The module 22 is arranged at a predetermined interval in the first direction, the plurality of LED units 24 are also arranged at a predetermined interval in the first direction, and four LEDs 26 are arranged in the first and second directions. Are arranged at regular intervals in a matrix.

  3 is a conceptual diagram illustrating a configuration of a surface on the side where the LED of the planar illumination device illustrated in FIG. 1 is not disposed (a right side surface of the planar illumination device 14 in FIG. 1). The figure also shows a frame 30 of the support base 16 and a support member 32 (a support member extending in the first direction is omitted) extending in the second direction (left-right direction in FIG. 3). As shown in the figure, each LED panel 20 has a surface on which the LEDs are not arranged fixed to a plurality of support members 32 extending in the second direction of the support base 16 with a panel fixture 34. .

  In each LED panel 20, four LEDs 26 included in each LED unit 24 are electrically connected in series, and a plurality of LED units included in each LED module 22 are also electrically connected in series. Further, a plurality of LED modules 22 included in the LED panel 20 are also electrically connected in series. That is, in each LED panel 20, all the LEDs 26 are electrically connected in series.

  Further, two LED panels 20 arranged at every other position are electrically connected via power supply wiring via a connector. Then, a plurality of sets are created using the two LED panels 20 that are electrically connected as one set, and one breaker 28 is provided corresponding to each of the created sets. That is, the number of breakers 28 that is half the number of LED panels 20 is used in the power supply device 18.

  Here, when one breaker 28 is provided for each LED panel 20, when the number of LED panels 20 increases, the number of necessary breakers 28 increases accordingly, and the size of the power supply device 18 is huge. Turn into. On the other hand, by providing one breaker 28 for the two LED panels 20 as described above, the number of breakers 28 housed in the power supply device 18 can be halved, and the size of the power supply device 18 can be reduced. There is an advantage that it can be made compact.

  In addition, as shown in FIG. 5, when the second LED panel 20 from the left breaks down and the power supply is cut off by the corresponding breaker 28, the illumination by the two LED panels 20 corresponding to the breaker 28 is turned off. (LED panel 20 in the shaded area in FIG. 5). Even in such a case, in the planar illumination device 14, the illumination of the adjacent LED panels 20 is not turned off at the same time and is not turned off in a large area. There is an advantage that no difference occurs.

  Next, a method for setting an interval between the display screen 12 and the planar illumination device 14 will be described.

  FIG. 6 is a graph showing a light distribution curve of LEDs constituting the planar illumination device. The horizontal axis of this graph represents the relative luminous intensity (%) of the LED 26, and the axis extending radially from the position where the relative luminous intensity is 0% represents the irradiation angle of the light emitted from the LED 26. Here, the irradiation angle is set to 0 ° in the direction parallel to the LED panel 20 and 90 ° in the direction perpendicular to the display screen 12. The relative luminous intensity represents the luminous intensity at each irradiation angle when the luminous intensity (cd) of the LED 26 when the irradiation angle is 90 ° is 100%.

  As shown in the graph of FIG. 6, for example, the relative luminous intensity is about 80% when the irradiation angle is about 55 °, and the relative luminous intensity is about 90% when the irradiation angle is about 65%. It can be seen that this is the case.

  Here, a value obtained by subtracting the irradiation angle from 90 ° (= 90 ° −irradiation angle) is defined as a solid angle. For example, the solid angle when the irradiation angle is 55 ° is 90 ° −55 ° = 35 °, and the solid angle when the irradiation angle is 65 ° is 90 ° −65 ° = 25 °. The solid angle represents a space in which light emitted from the LED 26 spreads conically around the axis with the direction perpendicular to the display screen 12 from the LED 26 as an axis.

  Next, FIGS. 7A and 7B are conceptual diagrams illustrating the relationship of the distance between the display screen and the planar illumination device. As shown in FIG. 4A, when four LEDs (a), (b), (c) and (d) are arranged at regular intervals in a matrix, two adjacent LEDs (a) to ( When the distance between b) is 100, the distance between the two LEDs (a) to (c) located on the diagonal line is 100√2. FIG. 2B shows a state in which two LEDs (a) and (c) positioned on the diagonal line are viewed from the side surface in the direction perpendicular to the diagonal line.

  For example, when the relative luminous intensity on the display screen 12 is desired to be about 80%, as described above, the irradiation angle may be about 55 °, that is, the solid angle may be about 35 ° from the graph of FIG. Therefore, as shown in FIG. 7B, if the distance between two LEDs located on the diagonal line is 100√2 and the solid angle is about 35 °, the display screen 12 and the planar illumination device 14 It can be seen that the distance between and should be about 100.

  Similarly, when it is desired to set the relative luminous intensity to about 90%, it is only necessary that the irradiation angle is about 65 °, that is, the solid angle is about 25 °, and therefore the distance between the two may be about 150. In other words, the light radiated from the LED 26 is displayed at a position where a space that expands in a conical shape with a solid angle when the relative luminous intensity on the display screen 12 has a predetermined value intersects between the two LEDs located on the diagonal line. It is desirable to arrange the screen 12.

  As described above, since the distance between the display screen 12 and the planar illumination device 14 is optimized, an optimum illuminance can be obtained without uneven illuminance, and the size of the internally illuminated signboard 10 ( (Thickness) can be set to the minimum optimized size.

  Next, the effect | action at the time of replacing | exchanging LED panel 20 according to the management method of the internally illuminated signboard of this invention is demonstrated.

  When replacing the LED panel 20, the display screen 12 can be removed and the LED panel 20 can be replaced from the front side of the planar illumination device 14. However, for example, when a huge internally illuminated signboard is installed in a limited installation space such as a rooftop advertising tower, there is no work space on the front side of the display screen 12, and a crane for attaching and detaching the display screen 12 is used. As already mentioned, there are problems such as the need for cars, etc., which takes time and money.

  Therefore, in the internally illuminated signboard 10, the LED panel 20 is replaced from the back side of the planar illumination device 14. However, the surface on which the LEDs of the respective LED panels 20 of the planar lighting device 14 are not arranged is fixed to the support member 32 extending in the second direction of the support base 16 by the panel fixture 34. That is, since the support member 32 becomes an obstacle and the LED panel 20 to be replaced cannot be moved in the direction perpendicular to the back surface of the planar lighting device 16, the LED panel 20 is replaced according to the following procedure.

  First, the panel fixture 34 of the LED panel 20 to be replaced is removed from the support member 32, and the power supply wiring is removed from the connector portion of the LED panel 20. Thereby, the LED panel 20 to replace | exchange will be in the state which can move along a 1st direction. In the vicinity of the upper and lower ends of the LED panel 20 in the longitudinal direction, the LED panel 20 is hooked and held on the frame 30 of the support base 16, and when the panel fixture 34 is removed from the support member 32, the LED panel 20 has its own weight. It is desirable that a hook is provided to prevent falling.

  Subsequently, the LED panel 20 to be replaced is moved (slid) downward in the first direction, for example, and removed from the support base 16. At this time, when it is difficult to move the LED panel 20 to be replaced along the first direction because the frame 30 or the installation surface of the support base 16 becomes an obstacle, the leading end of the LED panel 20 is placed on the support base 16. The LED panel 20 can be moved after being bent to the side. In this case, the LED panel 20 is preferably made of a flexible material.

  Next, the new LED panel 20 is moved in the first direction, for example, upward, and is disposed at the position where the LED panel 20 to be replaced is disposed. Then, the power supply wiring is connected to the new LED panel 20 at the connector portion, and is fixed to the support member 32 by the panel fixture 34.

  If it is the replacement | exchange method of said LED panel 20, even if it is a case where there is no working space in the front side of the display screen 12, replacement | exchange work can be performed easily. In addition, there is an advantage that a crane car or the like is unnecessary, and labor and cost can be reduced.

  It should be noted that the present invention has a larger display screen size like a rooftop advertising tower, and therefore, the higher the possibility that the number of divisions of the planar lighting device increases, the greater the effect when applied. However, the present invention is not limited to the rooftop advertising tower, but can be applied to various signboards such as sleeve signboards and wall signboards.

  Moreover, it is not essential to divide the LED panel into LED modules. Conversely, when the LED panel is divided into a plurality of LED modules, the number of divisions is not limited. The relationship between the LED module, the LED unit, and the LED is the same.

  Further, the two LED panels arranged at every other position are not limited to one set. For example, every two or three LED panels may be used, or the leftmost LED panel and the rightmost LED. Panels, the second LED panel from the left and the second LED panel from the right, may be one set of LED panels in the same order from the left side and the right side, or determine the set of LED panels according to an arbitrary pattern Can do. Moreover, it is good also considering two or more arbitrary numbers of LED panels as one group.

  Although the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and it is needless to say that various improvements and changes may be made without departing from the gist of the present invention.

10, 40 Internally illuminated signboard 12, 42 Display screen 14, 44 Planar illumination device 16, 46 Support base 18, 48 Power supply device 20, 50 LED panel 22 LED module 24 LED unit 26, 56 LED
28, 58 Breaker 30 Frame 32 Support member 34 Panel fixture

Claims (4)

A translucent display screen with an image displayed on the surface;
A support base for detachably supporting the display screen;
A plurality of long LED panels in which a plurality of LEDs are arranged in a first direction are arranged in a second direction orthogonal to the first direction, fixed to the support base, and the display screen A planar illumination device that illuminates from the back side;
A power supply device that supplies power to the plurality of LED panels of the planar lighting device via a breaker,
A plurality of sets of two or more LED panels that are not adjacent to each other are created as one set, and the breaker is provided corresponding to each of the created sets. Signboard. The plurality of LEDs are arranged in a matrix,
With the direction perpendicular to the display screen from the LED as an axis, a space where the light emitted from the LED spreads conically around the axis is a solid angle, and the light emitted from the LED in the display screen The display screen is arranged at a position where a space that expands conically with a solid angle when the relative luminous intensity becomes a predetermined value intersects between two LEDs located on a diagonal line. The internally illuminated signboard according to 1.   3. The surface of each of the LED panels on which the LEDs are not arranged is fixed to a support member extending in the second direction of the support base with a panel fixing tool. The internally illuminated signboard described in 1. When replacing the LED panel of the internally illuminated signboard according to claim 3,
Removing the panel fixture of the LED panel to be replaced from the support member, moving the LED panel to be replaced in the first direction along the first direction, and removing it from the support base;
A new LED panel is moved along the first direction in the second direction opposite to the first direction, and is disposed at the position where the LED panel to be replaced is disposed. A method for managing an internally-illuminated signboard, comprising fixing to the support member.

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