JP5564595B1 - Lighting system - Google Patents

Abstract

Provided is an illumination system capable of realizing uniform screen luminance when obtaining an illumination area corresponding to an arbitrary screen size.
A light source substrate having a light source, a light guide plate that diffuses and emits light from the light source, and a rear chassis that holds the light guide plate on the back side. A plurality of illumination modules 10a and 10b provided facing one side surface of the light guide plate are arranged, and in at least some of the adjacent illumination modules, one of the light guide plate and the rear chassis is part of the other light guide plate and the rear chassis. It is the illumination system 1 piled up on the front surface. Among the side surfaces of one light guide plate, a luminance adjusting member 18 that does not emit the light diffused inside the one light guide plate is provided on a side surface 13k disposed on the output surface 13g of the other light guide plate.
[Selection] Figure 5

Description

  The present invention relates to an illumination system, and more particularly, to an illumination system in which a light source is disposed on a side surface of a light guide plate and an object to be illuminated is illuminated with light emitted from the light guide plate.

  2. Description of the Related Art An illumination system that illuminates an object to be illuminated such as printed matter using a backlight is known as an illumination application for an electric signboard or the like. In such a lighting system, there is an increasing demand for a large screen in order to attract a glance even from a distance such as a station premises or a department store. Moreover, in conventional lighting systems, a fluorescent tube or the like was used for the backlight. However, due to demands for energy saving, demand for backlights that use LEDs (Light Emitting Diodes) as light sources instead of fluorescent tubes has increased. doing.

LEDs are generally used as backlight light sources from the viewpoints of high color purity and excellent light control stability and high-speed response.
As the configuration of the backlight, there are a direct type in which an LED is arranged directly under a diffusion plate, and an edge light type. In the edge light type, a plurality of LEDs are arranged in a line on a light source substrate, and the light emitting portions of the LEDs are arranged to face the side surface of the light guide plate.

  For this reason, the edge light type can be made thinner than the direct type, which is advantageous in that the lighting system can be made thinner. In addition to the so-called two-sided edge lighting system in which LEDs are arranged on both the upper and lower sides or both the left and right sides of the light guide plate, the so-called one-side edge method in which LEDs are arranged on either the upper or lower side or the left and right sides of the light guide plate Many lighting systems are also used.

The light emitted from each LED enters the inside of the light guide plate from the side surface that is the entrance surface of the light guide plate, is guided while being diffused inside the light guide plate, and is located on the front side (illuminated body side). Exits from. Usually, a reflection sheet is installed on the back side of the light guide plate (on the side opposite to the object to be illuminated), and the light leaking from the back side of the light guide plate is reflected back to the front side to increase the light use efficiency.
The object to be illuminated is configured, for example, by attaching a printing sheet to the surface of a diffusion plate such as an acrylic plate, and light from the exit surface of the light guide plate illuminates the printing content of the printing sheet.

  Regarding an illumination system having an edge light type backlight, for example, in Patent Document 1, two light guide plates are overlapped, and light from an LED is directed in two directions, for example, on the driver's seat side and the passenger's seat side. The structure of the light guide plate to be emitted is disclosed.

JP 2008-77946 A

  When manufacturing the lighting system as described above, mass production standards for the size are not defined, and there are requirements for various sizes. Therefore, it is necessary to correspond to the screen size required for each lighting system, and is usually designed and manufactured individually for each lighting system. In such a situation, it is conceivable to construct a lighting system having a desired screen size using a plurality of already standardized lighting modules. Specifically, a plurality of illumination modules including a light guide plate and an edge light type backlight may be prepared, and light guide plates of adjacent illumination modules may be partially overlapped.

  However, in order to obtain an illumination area corresponding to a desired screen size, when a part of the light guide plate of the adjacent illumination module is overlapped, leakage light from the side surface of the front light guide plate is emitted from the exit surface of the rear light guide plate. There is a problem that the overlapping portion becomes brighter than the surroundings (also referred to as luminance unevenness). In Patent Document 1, the light guide plates are completely overlapped with each other, and the light guide plates are not partially overlapped with each other. Therefore, the brightness unevenness does not occur and the brightness unevenness cannot be solved.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an illumination system capable of realizing uniform screen luminance when obtaining an illumination area corresponding to an arbitrary screen size. And

  In order to solve the above-described problems, a first technical means of the present invention includes a light source substrate provided with a light source, a light guide plate that diffuses and emits light from the light source, and the light guide plate on the back side. A plurality of illumination modules provided with the light source facing one side surface of the light guide plate, and at least part of the adjacent illumination modules includes one of the light guide plates. A lighting system in which a part of the rear chassis is overlapped with the other light guide plate and the front surface of the rear chassis, and is disposed on the exit surface of the other light guide plate among the side surfaces of the one light guide plate. A brightness adjusting member that does not emit light diffused inside the one light guide plate is provided on the side surface.

  According to a second technical means, in the first technical means, the brightness adjusting member covers a first reflective layer that reflects light diffused inside the one light guide plate, and the first reflective layer, And a second reflective layer that reflects light from the exit surface of the other light guide plate.

  According to a third technical means, in the first technical means, the brightness adjusting member covers a light absorbing layer that absorbs light diffused inside the one light guide plate, covers the light absorbing layer, and the other light guide member. And a reflection layer that reflects light from the light exit surface of the light plate.

  According to the present invention, since the light guide plates of adjacent illumination modules are overlapped, an illumination area corresponding to an arbitrary screen size can be obtained. And since the brightness adjusting member that does not emit the light diffused inside is provided on the side surface of one light guide plate, it is possible to prevent the overlapped portion of the light guide plate from becoming brighter than its surroundings, and the screen brightness can be reduced. Uniformity can be achieved.

It is a figure which shows an example of the assembly structure of the single lighting module which comprises the lighting system by this invention. It is a figure which shows the side cross section of the single illumination module which comprises the illumination system by this invention. It is a figure which shows the structural example of the illumination system by this invention, Comprising: It is the front schematic of an illumination system. FIG. 4 is a schematic side sectional view of the illumination system shown in FIG. 3. FIG. 4 is a schematic perspective view of the illumination system shown in FIG. 3. It is a figure which shows the other structural example of the illumination system by this invention, Comprising: It is the plane schematic diagram and front schematic diagram of an illumination system.

  FIG. 1 is a diagram showing an example of an assembly configuration of a single lighting module constituting the lighting system according to the present invention, and FIG. 2 is a side sectional view of a single lighting module constituting the lighting system according to the present invention. is there. The illumination system according to the present invention is configured to use a plurality of illumination modules 10 and to overlap a part of the adjacent illumination modules 10 in order to obtain an arbitrary illumination area. First, the configuration of a single illumination module 10 for configuring the illumination system will be described with reference to FIGS.

The illumination module 10 includes a backlight chassis (rear chassis) 11 that supports the illumination module, a reflection sheet 12, and a light guide plate 13, and these are stacked on the front side of the backlight chassis 11 and assembled. As shown in FIG. 2, the lighting module 10 also has a power supply driver 17 on the back side of the backlight chassis 11.
The light guide plate 13 is made of a material such as acrylic resin, polycarbonate resin, or cycloolefin resin (COP), and is formed in a flat plate shape having a thickness of about 3 mm, for example.

  For example, in the one-edge type illumination module 10, an LED 15 serving as a light source is provided so as to face one side surface 13 i of the light guide plate 13. The LEDs 15 are arranged in a row on the light source board 14, and the light source board 14 is connected to the power supply driver 17 via a harness (not shown). As the LED 15, a white LED that emits white light with a single LED, or an LED that emits RGB single-color light is used. White LEDs are advantageous in that they are low-cost and the total power consumption can be reduced due to the number of LEDs required. A wide color gamut performance can be obtained by using RGB single-color LEDs.

  The light emitted from the LED 15 enters from the side surface 13i of the light guide plate 13, is guided while diffusing inside the light guide plate 13, and exits from the exit surface 13g of the light guide plate 13 (the upper side in FIG. 1 or the left side in FIG. 2). By doing so, the to-be-illuminated body placed on the front side of the exit surface 13g can be illuminated. As shown in FIG. 1, a reflective tape 19 may be affixed to the other side surface 13h opposite to the side surface 13i in order to suppress luminance unevenness due to leaked light.

Further, the reflection sheet 12 provided on the back side of the light guide plate 13 reflects light leaking from the back side of the light guide plate 13 and returns it to the front side, thereby increasing the light use efficiency. As the reflection sheet 12, for example, a finely foamed PET sheet is used.
The light guide plate 13 and the reflection sheet 12 are positioned on the backlight chassis 11 formed of a metal plate or the like.

  In order to give rigidity to the backlight chassis 11, a concave / convex drawing process may be performed, or an auxiliary metal fitting or the like may be attached to the back side of the backlight chassis 11 (both are not shown). The end portion of the backlight chassis 11 is bent so as to attach the light source substrate 14, and a bezel 16 for fixing the reflection sheet 12 and the light guide plate 13 to the backlight chassis 11 is attached to the end portion.

  2 is set to be approximately the same as the thickness of the light guide plate 13, the width of the light source substrate 14 (the width in the thickness direction of the light guide plate 13) is inevitably set. It becomes larger than the thickness of the optical plate 13. Therefore, the light source substrate 14 has a shape protruding in the thickness direction of the light guide plate 13 with respect to the front and back surfaces of the light guide plate 13. In this case, when the end portion of the backlight chassis 11 is bent and the light source substrate 14 is attached to the wall portion, the light source substrate 14 is placed on the opposite side of the backlight chassis 11, that is, on the exit surface 13 g of the light guide plate 13. It will protrude more greatly.

  When an illumination system having a desired illumination area is created by combining a plurality of such single illumination modules 10, the positions of the light source substrates 14 of the adjacent illumination modules 10 are mutually different with respect to the light guide plate 13 as will be described later. You may comprise so that it may become an other side. Thereby, the increase in the thickness of the whole illumination system by protrusion of the light source board | substrate 14 can be suppressed.

3 is a diagram illustrating a configuration example of the illumination system according to the present invention, and is a schematic front view of the illumination system, FIG. 4 is a schematic side sectional view of the illumination system illustrated in FIG. 3, and FIG. It is a perspective schematic diagram of the illumination system shown in FIG.
In the present embodiment, the illumination system 1 having a predetermined illumination area is constructed by combining two single illumination modules 10a and 10b as described above. Each of the lighting modules 10a and 10b is the same as the lighting module 10 described with reference to FIGS.

  In this case, as shown in FIG. 3, the illumination system 1 is created by overlapping a part of the two illumination modules 10a and 10b in the front-rear direction. Thereby, light each radiate | emits from the output surface 13g of the two light-guide plates 13, and can illuminate a to-be-illuminated body in a wide area | region. At this time, as shown in FIG. 4, since the backlight chassis 11 exists on the back surface of the light guide plate 13 of the lighting module 10a stacked on the front side, another lighting module 10b stacked on the back side thereof. The light from the light guide plate 13 is blocked by the backlight chassis 11 of the illumination module 10a.

However, as described above, when another illumination module 10b is overlapped and illuminated behind the illumination module 10a, the light from the light guide plate 13 of the illumination module 10b located on the back side is illuminated with the illumination module 10a located on the front side. The light leaked from the side surface of the light guide plate 13 is directly affected.
Here, as shown in FIGS. 3 and 4, in two adjacent illumination modules 10 a and 10 b, the LED 15 of one illumination module 10 a located on the right side is arranged on the upper side of the illumination system 1, and the other one located on the left side is arranged. The LED 15 of the lighting module 10b is disposed on the lower side of the lighting system 1, which is the opposite side surface.

For this reason, the light leaked from the side surface 13k arranged on the emission surface 13g of the illumination module 10b located on the left side of the left and right side surfaces 13j, 13k of the illumination module 10a located on the right side of the illumination module 10b. In addition to the light from the exit surface 13g, the overlapped portion becomes brighter than the surroundings.
Therefore, in the present embodiment, the brightness adjusting member 18 is provided on the side surface 13k of the illumination module 10a located on the right side. Thereby, the light from the emission surface 13g of the illumination module 10b located on the left side is not directly affected by the light from the side surface 13k of the illumination module 10a located on the right side, and the entire area on the front side of the two light guide plates 13 Thus, uniform illumination light can be emitted.

  Specifically, as shown in FIG. 5, the brightness adjusting member 18 has, for example, a two-layer structure, and includes a reflective tape 18a attached to the side surface 13k of the illumination module 10a, and a reflective tape 18b covering the reflective tape 18a. It consists of The reflective tape 18a affixed to the side surface 13k corresponds to the first reflective layer of the present invention, and functions so as to reflect the light diffused inside the light guide plate 13 of the illumination module 10a and not emit it to the outside. The reflective tape 18b that covers the reflective tape 18a corresponds to the second reflective layer of the present invention, and functions to reflect light from the exit surface 13g of the illumination module 10b. For example, a finely foamed PET sheet is used for the reflective tapes 18a and 18b, and the reflective tapes 18a and 18b are formed to have the same width (about 3 mm) and the same length as the side surface 13k of the light guide plate 13 to block the side surface 13k.

  The luminance adjusting member 18 may have a two-layer structure including a light absorbing tape (also referred to as a light shielding tape) attached to the side surface 13k and a reflective tape covering the light absorbing tape. The light absorbing tape affixed to the side surface 13k corresponds to the light absorbing layer of the present invention, and functions so as to block the light diffused inside the light guide plate 13 of the illumination module 10a so as not to be emitted outside. For example, a black polyester film is used for the light absorbing tape. On the other hand, the reflective tape covering the light absorbing tape corresponds to the reflective layer of the present invention, and functions to conceal the black light absorbing tape and reflect light from the exit surface 13g of the illumination module 10b. For example, a microfoamed PET sheet is used as the reflective tape.

FIG. 6 is a diagram showing another configuration example of the illumination system according to the present invention, and is a schematic plan view and a schematic front view of the illumination system.
In the present embodiment, an illumination system 1a having a predetermined illumination area is constructed by combining six single illumination modules 10a to 10f as described above. Each of the illumination modules 10a to 10f is the same as the illumination module 10 described with reference to FIGS.

Specifically, as shown in FIG. 6, the LED 15 of the illumination module 10a is arranged on the upper side of the illumination system 1a, the LED 15 of the illumination module 10b is arranged on the lower side of the illumination system 1a, and the two illumination modules 10a and 10b are arranged. The light guide plates 13 are arranged vertically so that they are flush with each other.
Similarly, the two lighting modules 10c, 10d and the two lighting modules 10e, 10f are arranged one above the other so that the respective light guide plates 13 are flush with each other, but in the lighting system 1a, the lighting modules 10a, 10a, A part of the illumination modules 10c and 10d and a part of the illumination modules 10e and 10f are overlapped behind 10b.

  As shown in the schematic plan view of FIG. 6, the illumination modules 10a and 10b located in the center are arranged on the front side of the illumination modules 10c and 10d located on the left side and the illumination modules 10e and 10f located on the right side. Therefore, as shown in the schematic front view of FIG. 6, the luminance adjusting members 18 are provided on the left and right side surfaces of the light guide plates 13 of the illumination modules 10 a and 10 b, respectively. Thereby, the light from each exit surface 13g of the illumination modules 10c and 10d and the light from each exit surface 13g of the illumination modules 10e and 10f are directly affected by the light from the left and right side surfaces of the illumination modules 10a and 10b. Thus, uniform illumination light can be emitted over the entire area on the front side of each light guide plate 13.

  In the above embodiment, the edge light type is described as an example, but the present invention is also applicable to an illumination system having a direct type backlight. Further, although the brightness adjusting member in FIG. 5 is formed by two sheets, it may be formed by one sheet.

  Although the embodiments have been described above, the present invention relates to a light source substrate on which a light source is disposed, a light guide plate that diffuses and emits light from the light source, and a rear chassis that holds the light guide plate on the back side. A plurality of illumination modules provided with the light source facing one side surface of the light guide plate, and at least part of the adjacent illumination modules includes one of the light guide plate and one of the rear chassis. A lighting system in which a portion is overlapped with the other light guide plate and the front surface of the rear chassis, and on the side surface of the one light guide plate disposed on the light exit surface of the other light guide plate, A brightness adjusting member that does not emit light diffused inside one of the light guide plates may be provided.

  Thus, since the light guide plates of adjacent illumination modules are overlapped, an illumination area corresponding to an arbitrary screen size can be obtained. And since the brightness adjusting member that does not emit the light diffused inside is provided on the side surface of one light guide plate, it is possible to prevent the overlapped portion of the light guide plate from becoming brighter than its surroundings, and the screen brightness can be reduced. Uniformity can be achieved.

  In addition, the brightness adjusting member covers the first reflection layer that reflects the light diffused inside the one light guide plate and the light from the emission surface of the other light guide plate. You may provide the 2nd reflective layer which reflects. In this case, since the first reflection layer does not reflect and emit the light diffused inside one of the light guide plates, it is possible to prevent the overlapping portions of the light guide plates from becoming brighter than the surroundings. In addition, since the second reflective layer covers the first reflective layer, it is possible to prevent luminance unevenness caused by the first reflective layer.

  The brightness adjusting member includes a light absorbing layer that absorbs light diffused inside the one light guide plate, and a reflective layer that covers the light absorbing layer and reflects light from the exit surface of the other light guide plate. And may be provided. In this case, since the light absorbing layer does not absorb and emit the light diffused inside one of the light guide plates, it is possible to prevent the overlapping portions of the light guide plates from becoming brighter than the surroundings. The light absorption layer is often composed of a dark color such as black, but since the reflection layer covers the light absorption layer, it is possible to prevent luminance unevenness caused by the light absorption layer such as black.

DESCRIPTION OF SYMBOLS 1,1a ... Lighting system 10, 10a-10f ... Lighting module, 11 ... Backlight chassis, 12 ... Reflection sheet, 13 ... Light guide plate, 13g ... Outgoing surface, 13h-13k ... Side surface, 14 ... Light source substrate, 15 ... LED, 16 ... bezel, 17 ... power driver, 18 ... brightness adjusting member, 18a ... reflective tape or light absorbing tape, 18b, 19 ... reflective tape.

Claims (3)

A light source substrate on which a light source is disposed; a light guide plate that diffuses and emits light from the light source; and a rear chassis that holds the light guide plate on the back side. Arrange multiple lighting modules provided facing one side,
In at least some of the adjacent lighting modules, one of the light guide plate and a part of the rear chassis is overlaid on the other light guide plate and the front surface of the rear chassis,
Among the side surfaces of the one light guide plate, a luminance adjusting member that does not emit light diffused inside the one light guide plate is provided on a side surface disposed on the output surface of the other light guide plate. Characteristic lighting system. The lighting system according to claim 1,
The brightness adjusting member covers a first reflective layer that reflects light diffused inside the one light guide plate, and covers the first reflective layer, and reflects light from an exit surface of the other light guide plate. An illumination system comprising: a second reflective layer. The lighting system according to claim 1,
The brightness adjusting member includes a light absorption layer that absorbs light diffused inside the one light guide plate, and a reflection layer that covers the light absorption layer and reflects light from the exit surface of the other light guide plate. A lighting system comprising:

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