JPWO2020070921A1 - Planar lighting device - Google Patents

Abstract

The planar illumination device (1) of the embodiment includes a light source substrate (15), a light guide plate (13), and a spacer (14). In the light source substrate (15), a plurality of light sources (15b) are arranged in one direction. Light from the light source (15b) is incident on the end face of the light guide plate (13). The spacer (14) maintains the clearance between the light source (15b) and the end face of the light guide plate (13) at a predetermined value. The optical sheet (17, 18, 19) is fixed to the spacer (14).

Description

The present invention relates to a planar lighting device.

As a planar lighting device used as a backlight of a liquid crystal display device, light is incident on the incoming surface of the end surface of the light guide plate from a plurality of LEDs (Light Emitting Diodes), and light is emitted from one main surface of the light guide plate. There is a type to be done. In such a type of planar lighting device, when the light guide plate is thermally expanded, the light guide plate is pressed against the generated LED, and the incident surface of the light guide plate may be locally deformed or damaged. Therefore, a predetermined clearance is required between the light entering surface and the light emitting surface of the LED.

Specifically, convex portions are provided at both ends of the light guide plate on the light entrance surface side, or convex portions are provided at one end and the intermediate portion of the light guide plate on the light entrance surface side so that the LED on the LED substrate is provided. In many cases, the convex portion of the light guide plate comes into contact with the portion not arranged and stretches (see, for example, Patent Document 1). Further, the circuit board on which the LED is arranged is provided with a spacer whose other end is in contact with the light guide plate (see, for example, Patent Document 2), or a cushioning member made of a soft material is provided between the light guide plate and the circuit board. (See, for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 2012-237826 Japanese Unexamined Patent Publication No. 2008-89944 Japanese Unexamined Patent Publication No. 2014-38827

However, in the case of a structure in which the convex portion of the light guide plate is in contact with and stretches the portion on the LED substrate where the LED is not arranged, the convex portion needs to have a certain width in order to secure the strength. Placement could be difficult.

That is, when the convex portions are provided at both ends of the light guide plate, the LEDs cannot be arranged at both ends where the convex portions are arranged, and the LEDs are arranged closer to the inside, so that the end portions are arranged. It may affect the optical characteristics. When many LEDs are arranged on the LED substrate, the pitch between the LEDs becomes short, and the fact that the convex portion creates a portion where the LED cannot be arranged at the end greatly affects the optical characteristics. Further, when the convex portion is provided in the intermediate portion of the light guide plate, if there is no gap for arranging the convex portion in the intermediate portion on the LED substrate, the LED must be removed to secure the gap, and the convex portion must be secured. The pitch of the LED in the portion where the LED is arranged may be widened, which may affect the optical characteristics.

Further, when the circuit board on which the LED is arranged is provided with a spacer whose other end is in contact with the light guide plate, special processing is required for the circuit board, which may complicate the manufacturing process. Further, when a cushioning member made of a soft material is provided between the light guide plate and the circuit board, the clearance between the light receiving surface of the light guide plate and the light emitting surface of the LED may not be properly maintained due to the deformation of the cushioning member. is there.

Further, in this type of planar lighting device, there is a strong demand for narrowing the frame, but there are cases where it is difficult to narrow the frame due to the fixing area of the optical sheet arranged on the exit surface side of the light guide plate. ..

The present invention has been made in view of the above, and an object of the present invention is to provide a planar illumination device capable of improving optical characteristics and contributing to a narrowing of a frame.

In order to solve the above-mentioned problems and achieve the object, the planar illumination device according to one aspect of the present invention includes a light source substrate, a light guide plate, and a spacer. In the light source substrate, a plurality of light sources are arranged in one direction. Light from the light source is incident on the end face of the light guide plate. The spacer maintains a clearance between the light source and the end face of the light guide plate at a predetermined value. The optical sheet is fixed to the spacer.

The planar illumination device according to one aspect of the present invention can improve the optical characteristics and contribute to narrowing the frame.

FIG. 1 is a front view of the backlight according to the embodiment. FIG. 2 is a perspective view showing a state in which the components of the backlight are disassembled. FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a diagram showing a state in which the optical sheet is fixed to the spacer. FIG. 5 is a diagram showing an example of a modification of the spacer. FIG. 6 is a cross-sectional view taken along the line BB in FIG. FIG. 7 is a perspective view showing how the elastic member is attached to the frame. FIG. 8 is a diagram showing another example of the elastic member. FIG. 9 is a front view showing another example of the backlight.

Hereinafter, the planar lighting device according to the embodiment will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the relationship between the dimensions of each element in the drawing, the ratio of each element, and the like may differ from reality. Even between drawings, there may be parts where the relationship and ratio of dimensions are different from each other. Further, in principle, the contents described in one embodiment or modification are similarly applied to other embodiments or modifications.

FIG. 1 is a front view of the backlight 1 according to the embodiment. Further, FIG. 2 is a perspective view showing a state in which the components of the backlight 1 are disassembled. The backlight 1 is an example of a planar lighting device, and is provided on the back surface of a liquid crystal display device in a navigation device, an indicator, or the like.

In FIGS. 1 and 2, the backlight 1 is rectangular (or square) and has a plate-like outer shape, and one surface (the front surface in the drawing) is an exit surface, from the inside to the outside. Light is radiated toward it. When used for a navigation device, an indicator, or the like, the liquid crystal display device is mounted on the exit surface side.

The backlight 1 includes a frame 11, a reflective sheet 12, a light guide plate 13, a spacer 14, an LED substrate 15, and an elastic member 16.

The frame 11 has a substantially rectangular shape having edges (side walls) on the four outer sides of the bottom plate, and is formed of sheet metal, die casting, or the like. The LED substrate 15, the reflective sheet 12, the light guide plate 13, the elastic member 16, and the spacer 14 are sequentially housed in the frame 11, and the backlight 1 is configured.

In the LED substrate 15, a plurality of LEDs 15b are arranged in one direction on an elongated thin plate-shaped substrate 15a, and in the present embodiment, the LED substrate 15 is fixed to the inner surface of one side wall (lower side wall in the drawing) of the frame 11. , The end face of the light guide plate 13 is irradiated with light. The LED substrate 15 or the substrate 15a is an example of a light source substrate. LED15b is an example of a light source.

The reflective sheet 12 reflects the light incident on the light guide plate 13 from the LED 15b of the LED substrate 15 and leaks to the surface opposite to the exit surface (front surface in the drawing) in the process of guiding the light. It is a member to return to the light guide plate 13. The reflective sheet 12 may be omitted.

The light guide plate 13 guides the light incident from the LED 15b of the LED substrate 15 and emits the light from the emission surface (front surface in the drawing). When an optical sheet such as a diffusion sheet, a prism sheet, or a DBEF (Dual Brightness Enhancement Film) is provided on the exit surface side of the light guide plate 13 in order to adjust the optical characteristics of the light emitted from the light guide plate 13. There is.

The spacer 14 is for maintaining a clearance between the lower end surface of the light guide plate 13 in the figure and the LED 15b at a predetermined value, and has a substantially wedge-shaped shape. In addition to FIGS. 1 and 2, the structure of the spacer 14 will be described with reference to FIG. 3, which shows a cross-sectional view taken along the line AA in FIG.

In FIGS. 1 to 3, the spacer 14 is formed between the portion of the LED substrate 15 where the LED 15b is not provided, that is, the surface of the substrate 15a itself and the end surface which is the light receiving surface of the light guide plate 13. It includes a plurality of partition plates 14b arranged so that the plate surface faces the arrangement direction of the upper LEDs 15b. The partition plate 14b is provided at a substantially central position of the two LEDs 15b when it is provided between the two LEDs 15b so as not to be too close to the LEDs 15b, and leaves a gap between the partition plate 14b and the LED 15b when it is provided at the end. It is desirable to be provided.

A load on which the light guide plate 13 is pressed by the elastic member 16 described later is applied to the partition plate 14b of the spacer 14, but the load applied to one partition plate 14b is reduced by providing a plurality of partition plates 14b. , Sufficient strength is maintained even if it is thin. Therefore, even when the LEDs 15b are arranged on the LED substrate 15 at a short pitch, the partition plate 14b can be inserted in the gap where the LEDs 15b are not arranged, without affecting the pitch of the LEDs 15b. It is possible to place it. Thereby, it is possible to improve the optical characteristics due to the pitch of the LED 15b.

Further, the spacer 14 connects one end of a plurality of partition plates 14b, extends in the arrangement direction of the LEDs 15b on the LED substrate 15, and is arranged with the plate surface facing in the thickness direction of the light guide plate 13 a. Have. The connecting plate 14a and the partition plate 14b are formed as an integral spacer 14 by injection molding or the like. The connecting plate 14a and the partition plate 14b may be formed as separate bodies, or the connecting plate 14a and the partition plate 14b may be integrated by another fixing member. In either form, since the partition plate 14b (corresponding to the convex portion of the light guide plate in the prior art) is formed separately from the light guide plate 13, the partition plate 14b can be formed thinly. Further, the spacer 14 can be easily colored. For example, it is desirable that the connecting plate 14a and the partition plate 14b of the spacer 14 are formed of a white resin or the like or coated with a white coating for the purpose of improving the brightness. Further, for the purpose of reducing hot spots in which the brightness is locally increased, it is desirable that the product is formed of a black resin or the like or is coated with a black paint.

Further, the connecting plate 14a of the spacer 14 extends so as to overlap the end portion of the light guide plate 13 on the end surface side. By overlapping the connecting plate 14a of the spacer 14 with the end portion of the light guide plate 13, light leakage from the end portion of the light guide plate 13 can be suppressed, and deterioration of optical characteristics can be prevented.

Further, the connecting plate 14a of the spacer 14 can be used as a fixing region with double-sided tape or the like when an optical sheet is further laminated on the light guide plate 13. FIG. 4 is a diagram showing a state in which the optical sheets 17, 18 and 19 are fixed to the spacer 14, and is shown from the viewpoint of the cross-sectional view taken along the line AA in FIG. 1 as in FIG. In FIG. 4, an optical sheet 17 is laminated so as to cover at least a part of the contact portion between the light guide plate 13 and the connection plate 14a and the LED 15b, and is fixed to the connection plate 14a with double-sided tape or the like. 19 is also fixed in the same manner.

In general, the edge of the optical sheet is often fixed to the frame portion of the light guide plate excluding the light receiving side or the frame portion of the frame with double-sided tape or the like. It is becoming difficult to secure a fixed area. In that respect, in the present embodiment, the spacer 14 (specifically, the spacer 14 (specifically, the upper part of the plurality of LEDs 15b arranged apart from each other) is provided on the end surface side of the light guide plate 13 so as to include a portion that is originally a dead area. Since the optical sheet can be stably fixed to the flat plate-shaped connecting plate 14a) with double-sided tape or the like, a fixing area can be secured without widening the frame width on the light receiving side. Further, it is not necessary to secure a fixing area in the frame portion other than the light receiving side, which can contribute to narrowing the frame.

FIG. 5 is a diagram showing an example of a modification of the spacer 14, and the fixing region of the optical sheet is provided in a stepped shape in which the thickness of the connecting plate 14a is different for each optical sheet. As a result, the optical sheets can be fixed independently (individually) from the other optical sheets for each optical sheet.

In FIG. 5, the connecting plate 14a of the spacer 14 is provided with a flat portion 14c which is a fixing region for the optical sheet 17 from the front side of the drawing, and the ear portion 17a of the optical sheet 17 is fixed by double-sided tape or the like. Ru. Next, a flat portion 14d having a step corresponding to the thickness of the optical sheet 17 is provided on the flat portion 14c, and the flat portion 14d is provided with an ear portion of the optical sheet 18 as a fixing region for the optical sheet 18. 18a is fixed with double-sided tape or the like. Similarly, a flat portion 14e having a step corresponding to the thickness of the optical sheet 18 is provided on the flat portion 14d, and the flat portion 14e is provided with an ear of the optical sheet 19 as a fixing region for the optical sheet 19. The portion 19a is fixed with double-sided tape or the like.

Returning to FIG. 1, one end of the light guide plate 13 is supported by the substrate 15a via the spacer 14, and the other corner is supported by the frame 11 via an elastic member 16 formed of rubber or the like. FIG. 6 is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 7 is a perspective view showing how the elastic member 16 is attached to the frame 11.

In FIGS. 6 and 7, a round bar-shaped convex portion 16a is provided at one end of the elastic member 16 on the side opposite to the side in contact with the light guide plate 13, and the frame 11 penetrates the shape corresponding to the convex portion 16a. The hole 11a is provided. In the state where the elastic member 16 is attached to the corner portion of the frame 11, the convex portion 16a of the elastic member 16 fits into the hole portion 11a of the frame 11. The convex portion 16a of the elastic member 16 and the hole portion 11a of the frame 11 form a pair, and have a function of restricting the elastic member 16 from moving in the thickness direction of the light guide plate 13.

Generally, the elastic member arranged between the corner portion of the light guide plate and the corner portion of the frame is compressed by the thermal expansion of the light guide plate, and when the compression load is increased, the elastic member is crushed to the exit surface side of the light guide plate. There was an inconvenience of popping out. In the type in which the optical sheet is provided on the exit surface side of the elastic member, the optical sheet may be pinched by the protruding elastic member and wrinkled, which affects the optical characteristics.

However, in the present embodiment, since the convex portion 16a of the elastic member 16 is inserted into the hole portion 11a of the frame 11, even if the elastic member 16 is strongly compressed, the elastic member 16 is the exit surface of the light guide plate 13. It is prevented from popping out to the side. Therefore, it is possible to prevent the optical sheet from being wrinkled and deteriorating the optical characteristics.

The convex portion 16a of the elastic member 16 may have a rectangular rod shape instead of the round rod shape. Further, the hole portion 11a of the frame 11 may be a concave portion (groove portion) facing the convex portion 16a instead of the through hole. Further, instead of providing the convex portion 16a on the elastic member 16 side, the convex portion may be provided on the frame 11 side, and the hole portion or the concave portion (groove portion) may be provided on the elastic member 16 side.

FIG. 8 is a diagram showing another example of the elastic member 16. In FIG. 8, a plate-shaped convex portion 16a is provided at one end of the elastic member 16 on the side opposite to the side in contact with the light guide plate 13, and the frame 11 has a through-hole portion 11a having a shape corresponding to the convex portion 16a. Is provided. In the state where the elastic member 16 is attached to the corner portion of the frame 11, the convex portion 16a of the elastic member 16 fits into the hole portion 11a of the frame 11. The convex portion 16a of the elastic member 16 and the hole portion 11a of the frame 11 form a pair, and have a function of restricting the elastic member 16 from moving in the thickness direction of the light guide plate 13.

The hole portion 11a of the frame 11 may be a concave portion (groove portion) facing the convex portion 16a instead of the through hole. Further, instead of providing the convex portion 16a on the elastic member 16 side, the convex portion may be provided on the frame 11 side, and the hole portion or the concave portion (groove portion) may be provided on the elastic member 16 side.

Although the elastic member 16 in the backlight 1 in which one end of the light guide plate 13 is supported by the spacer 14 as shown in FIG. 1 has been described, the elastic member 16 may be applied to the backlight 1 in another form. You can also. FIG. 9 is a front view showing another example of the backlight 1, in which convex portions 13a are provided at both ends of the light guide plate 13 on the light receiving surface side, and the end portions on the substrate 15a where the LEDs 15b are not arranged. It has a structure in which the convex portion 13a of the light guide plate 13 comes into contact with the portion and stretches.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the case of a so-called edge light type planar lighting device in which light is incident on the incoming surface of the end surface of the light guide plate from a plurality of light sources and light is emitted from one main surface of the light guide plate, other than LEDs. It may be a light source, or even in the case of an LED, the positional relationship between the light source, the light source substrate, and the light guide plate is not limited.

As described above, the planar illumination device according to the embodiment includes a light source substrate in which a plurality of light sources are arranged in one direction, a light guide plate in which light from the light source is incident on the end face, and an end surface of the light source and the light guide plate. An optical sheet is fixed to the spacer with a spacer that maintains the clearance between the spacers at a predetermined value. This makes it possible to improve the optical characteristics of the planar lighting device and contribute to narrowing the frame.

Further, the spacer has a plurality of partition plates arranged so that the plate surface faces in the arrangement direction of the light sources. As a result, the clearance between the light source and the end face of the light guide plate can be maintained at a predetermined value.

Further, the spacer has a substantially kushiba-like shape. As a result, the clearance between the light source and the end face of the light guide plate can be maintained at a predetermined value.

The partition plate is white or black. As a result, it is possible to improve the brightness and reduce the number of hot spots.

Further, the spacer has a connecting plate extending in the arrangement direction of the light sources, which is connected to one end of a plurality of partition plates. As a result, a plurality of partition plates can be integrated, and an area for fixing the optical sheet can be provided.

Further, the optical sheet is fixed to the connection plate. As a result, it is possible to secure a fixing area for the optical sheet without widening the frame width on the light receiving side.

Further, the connection plate is arranged on the exit surface side of the light guide plate and overlaps the end surface side of the light guide plate. Thereby, it is possible to suppress the leakage of light from the end portion of the light guide plate and prevent the deterioration of the optical characteristics.

Further, a region for fixing the optical sheet is provided on the surface of the connection plate opposite to the light guide plate. As a result, the optical sheet can be easily fixed, and it is possible to contribute to narrowing the frame.

Further, the fixing area is provided in a stepped shape in which the thickness of the connecting plate differs for each optical sheet. As a result, the optical sheets can be fixed independently (individually) from the other optical sheets for each optical sheet.

Further, an elastic member arranged between the end portion of the light guide plate and the frame is provided, and the frame and the elastic member regulate the movement of the elastic member in the thickness direction of the light guide plate, such as a protrusion and a hole. It has a pair with a recess. This prevents the elastic member from being compressed by the thermal expansion of the light guide plate and popping out toward the exit surface side.

It also includes a light source substrate, a light guide plate, and a spacer. A plurality of light sources are arranged in one direction on the light source substrate. Light from a light source is incident on the end face of the light guide plate. The spacers are arranged between the light source substrate and the light guide plate, and between the light source substrate and the end surface of the light guide plate, a plurality of partition plates and a plurality of partition plates are arranged so that the plate surface faces in the arrangement direction of the light source. It has a connecting plate that connects one end of the light source, extends in the arrangement direction of the light source, and is arranged so that the plate surface faces in the thickness direction of the light guide plate. This makes it possible to improve the optical characteristics of the planar lighting device and contribute to narrowing the frame.

Moreover, the present invention is not limited by the above-described embodiment. The present invention also includes a configuration in which the above-mentioned components are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

1 Backlight, 11 frame, 11a hole, 13 light guide plate, 14 spacer, 14a connection plate, 14b partition plate, 14c, 14d, 14e flat part, 15 LED substrate, 15a substrate, 15b LED, 16 elastic member, 16a convex Part, 17, 18, 19 Optical sheet

0002.
In the case of a structure in which the convex portion is in contact with the portion and stretched, the convex portion needs to have a certain width in order to secure the strength, so that it may be difficult to arrange the convex portion.
[0006]
That is, when the convex portions are provided at both ends of the light guide plate, the LEDs cannot be arranged at both ends where the convex portions are arranged, and the LEDs are arranged closer to the inside, so that the end portions are arranged. It may affect the optical characteristics. When many LEDs are arranged on the LED substrate, the pitch between the LEDs becomes short, and the fact that the convex portion creates a portion where the LED cannot be arranged at the end greatly affects the optical characteristics. Further, when the convex portion is provided in the intermediate portion of the light guide plate, if there is no gap for arranging the convex portion in the intermediate portion on the LED substrate, the LED must be removed to secure the gap, and the convex portion must be secured. The pitch of the LED in the portion where the LED is arranged may be widened, which may affect the optical characteristics.
[0007]
Further, when the circuit board on which the LED is arranged is provided with a spacer whose other end is in contact with the light guide plate, special processing is required for the circuit board, which may complicate the manufacturing process. Further, when a cushioning member made of a soft material is provided between the light guide plate and the circuit board, the clearance between the light receiving surface of the light guide plate and the light emitting surface of the LED may not be properly maintained due to the deformation of the cushioning member. is there.
[0008]
Further, in this type of planar lighting device, there is a strong demand for narrowing the frame, but there are cases where it is difficult to narrow the frame due to the fixing area of the optical sheet arranged on the exit surface side of the light guide plate. ..
[0009]
The present invention has been made in view of the above, and an object of the present invention is to provide a planar illumination device capable of improving optical characteristics and contributing to a narrowing of a frame.
Means for Solving Problems [0010]
In order to solve the above-mentioned problems and achieve the object, the planar illumination device according to one aspect of the present invention includes a light source substrate, a light guide plate, and a spacer. In the light source substrate, a plurality of light sources are arranged in one direction. Light from the light source is incident on the end face of the light guide plate. The spacer is connected to a plurality of partition plates arranged so that the plate surface faces in the arrangement direction of the light source, and one end of the plurality of partition plates, and is connected to one end of the plurality of partition plates.

0003
It has a connecting plate that extends in the arrangement direction and overlaps with the end of the light guide plate on the exit surface side, and is optically applied only to the connecting plate of the spacer arranged on one side of the light guide plate on the entrance side. The seat is fixed.
[0011]
The planar illumination device according to one aspect of the present invention can improve the optical characteristics and contribute to narrowing the frame.
Brief Description of Drawings [0012]
FIG. 1 is a front view of a backlight according to an embodiment.
FIG. 2 is a perspective view showing a state in which the components of the backlight are disassembled.
FIG. 3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a diagram showing a state in which an optical sheet is fixed to a spacer.
FIG. 5 is a diagram showing an example of a modification of the spacer.
FIG. 6 is a cross-sectional view taken along the line BB in FIG.
FIG. 7 is a perspective view showing how an elastic member is attached to the frame.
FIG. 8 is a diagram showing another example of an elastic member.
FIG. 9 is a front view showing another example of the backlight.
A mode for carrying out the invention [0013]
Hereinafter, the planar lighting device according to the embodiment will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the relationship between the dimensions of each element in the drawing, the ratio of each element, and the like may differ from reality. Even between drawings, there may be parts where the relationship and ratio of dimensions are different from each other. Further, in principle, the contents described in one embodiment or modification are similarly applied to other embodiments or modifications.
[0014]
FIG. 1 is a front view of the backlight 1 according to the embodiment. Further, FIG. 2 is a perspective view showing a state in which the components of the backlight 1 are disassembled. The backlight 1 is an example of a planar lighting device, and is provided on the back surface of a liquid crystal display device in a navigation device, an indicator, or the like.
[0015]
In FIGS. 1 and 2, the backlight 1 is rectangular (or square) and has a plate-like outer shape, and one surface (the front surface in the drawing) is an exit surface, from the inside to the outside. Light is radiated toward it. Navige

Claims (11)

A light source board in which multiple light sources are arranged in one direction,
A light guide plate in which light from the light source is incident on the end face,
A spacer that maintains a clearance between the light source and the end face of the light guide plate at a predetermined value.
With
An optical sheet is fixed to the spacer,
Planar lighting device. The spacer has a plurality of partition plates arranged so that the plate surface faces in the arrangement direction of the light source.
The planar lighting device according to claim 1. The spacer has a substantially kushiba-like shape.
The planar lighting device according to claim 2. The partition plate is white or black.
The planar lighting device according to claim 2 or 3. The spacer has a connecting plate extending in the arrangement direction of the light source, which is connected to one end of the plurality of partition plates.
The planar lighting device according to any one of claims 2 to 4. The optical sheet is fixed to the connecting plate,
The planar lighting device according to claim 5. The connection plate is arranged on the exit surface side of the light guide plate and overlaps the end surface side of the light guide plate.
The planar lighting device according to claim 5 or 6. An area for fixing the optical sheet is provided on the surface of the connection plate opposite to the light guide plate.
The planar lighting device according to claim 6 or 7. The fixing region is provided in a stepped shape in which the thickness of the connecting plate is different for each optical sheet.
The planar lighting device according to claim 8. An elastic member arranged between the end of the light guide plate and the frame is provided.
The frame and the elastic member include a pair of protrusions and holes or recesses that regulate the elastic member from moving in the thickness direction of the light guide plate.
The planar lighting device according to any one of claims 1 to 9. A light source board in which multiple light sources are arranged in one direction,
A light guide plate in which light from the light source is incident on the end face,
A spacer arranged between the light source substrate and the light guide plate,
With
The spacer connects a plurality of partition plates arranged so that the plate surfaces face in the arrangement direction of the light source between the light source substrate and the end surface of the light guide plate, and one end of the plurality of partition plates. It has a connecting plate extending in the arrangement direction of the light sources and arranged so that the plate surface faces in the thickness direction of the light guide plate.
Planar lighting device.

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