JP7243572B2 - Display unit, display device and road information display device - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies ▲1 ▼ Date of sale September 14, 2019 Place of sale Seiwa Denki Co., Ltd. (36 Terada Shinike, Joyo City, Kyoto Prefecture) ▲2 ▼ Date of sale Reiwa 1 September 13 Sold place Koito Denko Co., Ltd. (720 Minamiichishiki, Nagaizumi-cho, Sunto-gun, Shizuoka Prefecture) ▲ 3 ▼ Sale date September 13, 2019 Sold place Nagoya Denki Kogyo Co., Ltd. (Shinoda area, Ama City, Aichi Prefecture) virtue 29-1)

The present invention relates to a display unit, a display device, and a road information display device.

The display screen of the display device is configured by arranging a plurality of display units vertically and horizontally. The display unit has a plurality of light-emitting elements provided on the mounting surface of the circuit board, a lens case that houses the circuit board, and a louver that is provided in the lens case and suppresses reflection of external light on the circuit board.

The lens case has a translucent bottom wall. The circuit board is accommodated in the lens case so that the mounting surface faces the bottom wall. The bottom wall of the lens case has a bottom wall rear surface facing the mounting surface of the circuit board, and a bottom wall surface positioned opposite to the bottom wall rear surface in the thickness direction of the bottom wall. The surface of the bottom wall is provided with a plurality of lens portions for condensing light emitted from the light emitting element. Each lens part is provided at a position corresponding to the position where each light emitting element is provided.

The louver has a mask portion covering the bottom wall surface and a connection portion connecting the mask portion to the bottom wall surface. The mask portion has a mask back surface facing the bottom wall surface and a mask front surface located on the opposite side of the mask back surface in the thickness direction of the mask. is provided.

In such a display unit, a gap is provided between the back surface of the mask and the surface of the bottom wall in order to prevent water droplets adhered by rain or the like from accumulating in the opening of the mask. See Patent Document 1). In such a display unit, water droplets adhering to the opening flow along the inner peripheral surface of the opening and reach the back surface of the mask, and then flow out of the display unit along the back surface of the mask.

JP 2012-163699 (see paragraph [0019])

By the way, in the display unit described in Patent Document 1, the inner peripheral surface of the opening extends parallel to the optical axis of the light emitting element. In such a display unit, water droplets adhering to the inner peripheral surface of the opening move along the direction parallel to the optical axis, reach the peripheral edge of the opening on the back side of the mask, and then move to the back side of the mask. . Therefore, the water droplets moving along the inner peripheral surface of the opening move toward the lens portion in a direction parallel to the optical axis when moving along the periphery of the opening on the back side of the mask. In this way, when the water droplet moves in the direction parallel to the optical axis at the peripheral edge portion of the opening on the back side of the mask, the water droplet is likely to be caught between the peripheral edge portion and the lens portion. If water droplets are caught between the lens portion and the peripheral portion, the optical path of the light emitted from the lens portion may be distorted or blocked by the water droplets.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a display unit, a display device, and a road information display capable of suppressing retention of water droplets by being sandwiched between a mask and a lens portion. Aimed at obtaining a device.

A display unit according to the present invention includes a box-shaped lens case having a transparent bottom wall, and a mounting surface, and the lens case is arranged so that the mounting surface faces the bottom wall. a circuit board housed in a housing; a plurality of light emitting elements provided on the mounting surface of the circuit board; and the bottom wall surface located on the opposite side in the thickness direction of the bottom wall, a gap is provided between the lens portion provided at a position corresponding to the position where the light emitting element is provided, and the bottom wall surface a mask provided so as to face the bottom wall surface in a normal state, and a louver having a connecting portion connecting the mask to the bottom wall surface, the mask being a surface facing the bottom wall surface. It has a back surface and a mask surface located on the opposite side of the mask back surface in the thickness direction of the mask, and has a plurality of through holes from the mask surface to the mask back surface at positions respectively corresponding to the positions where the plurality of lens portions are provided. and the inclined portion is inclined so that the distance between the optical axis of the light emitting element in a direction orthogonal to the optical axis increases as the distance from the mask front surface toward the mask back surface increases , The inclined portion is provided over the entire circumference of the cross section of the inner peripheral surface in the direction orthogonal to the optical axis .

According to the present invention, some of the water droplets adhering to the inner peripheral surface move along the inclined portion toward the back surface of the mask. The inclined portion is inclined so that the distance between the optical axis in the direction perpendicular to the optical axis of the light-emitting element increases as it approaches the back surface of the mask. It is guided in the direction in which the distance from the optical axis in the direction orthogonal to the optical axis increases. For this reason, it is possible to prevent water droplets from remaining between the mask and the lens portion, as compared with the conventional display unit in which water droplets move along the optical axis.

1 is a perspective view of a display device according to Embodiment 1 of the present invention; FIG. 1 is a front view of a display unit according to Embodiment 1 of the present invention; FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 2 is a partially enlarged backside view showing an enlarged part of the backside of the mask according to the first embodiment of the present invention; (a) is a partially enlarged cross-sectional view showing an enlarged part of the cross section of the display unit according to the first embodiment of the present invention, and (b) is an enlarged partial cross-section of the display unit according to the comparative example. 1 is a partially enlarged cross-sectional view shown in FIG. FIG. 4 is a cross-sectional view corresponding to FIG. 3 of the display unit according to the second embodiment of the present invention; FIG. 3 is a cross-sectional view corresponding to FIG. 3 of a display unit according to a third embodiment of the present invention; FIG. 4 is a cross-sectional view corresponding to FIG. 3 of a display unit according to a fourth embodiment of the present invention;

A mode for carrying out the present invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant description thereof will be appropriately simplified or omitted. Also, for convenience of explanation, the proportional relationship of sizes, shapes, etc. of portions shown in each drawing may be exaggerated.

(Embodiment 1)
A display unit 10 and a display device 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG.
FIG. 1 is a perspective view of a display device 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the display device 100 according to the first embodiment is configured by arranging a plurality of display units 10 for displaying images vertically and horizontally. A display surface 101 is a surface on which an image is displayed in the display device 100 .

The display device 100 is preferably installed on a highway or general road and used as a road information display device for displaying alert information or various road information. etc. can also be installed.

The display units 10 are arranged vertically and horizontally along the display surface 101 so that the image display surface 11 on which the image of each display unit 10 is displayed faces the front of the display device 100 . , are fixed to the support frame 200 by screws or the like. Thus, the display device 100 and the display surface 101 of the display device 100 are configured.

In this embodiment, the case where the display device 100 and the display unit 10 are installed perpendicularly to the ground will be described. The vertical direction is the vertical direction when the display surface 101 or the image display surface 11 is viewed from the front. These axial definitions are the same in other embodiments and modifications.

FIG. 2 shows a front view of the display unit 10 according to the first embodiment, FIG. 3 shows a cross-sectional view taken along the line AA of FIG. 2, and FIG. FIG. 10 is a partially enlarged rear view obtained by partially enlarging the rear view seen from the top.

As shown in FIGS. 2 and 3, the display unit 10 includes a lens case 40, a circuit board 20 accommodated in the lens case 40, a plurality of light emitting elements 30 provided on a mounting surface 22 of the circuit board 20, and a lens. A louver 50 covering the case 40 is provided.

The light emitting element 30 is a 3-in-1 type LED element containing LED chips of R (red), G (green) and B (blue). is provided in An image is displayed by the plurality of light emitting elements 30 as a whole, and each light emitting element 30 becomes a pixel forming an image. As described above, in the present embodiment, the display unit 10 is installed vertically to the ground, so the optical axis LA of the light emitting element 30 extends in the horizontal direction.

The circuit board 20 is made of an insulating resin material, glass material, ceramic material, or the like, and is accommodated in the lens case 40 so that the mounting surface 22 faces the bottom wall 41 of the lens case 40 . Moreover, the circuit board 20 is provided so that the mounting surface 22 extends along a plane parallel to the image display surface 11 .

The lens case 40 is configured as a box-shaped housing, and is provided with an opening 42 on the side opposite to the image display surface 11 side of the display unit 10 . Further, since the lens case 40 is made of a translucent resin material such as polycarbonate resin or acrylic resin, the bottom wall 41 of the lens case 40 has translucency.

The bottom wall 41 of the lens case 40 has a bottom wall back surface 41a facing the mounting surface 22 and a bottom wall surface 41b located on the opposite side of the bottom wall back surface 41a in the thickness direction of the bottom wall 41 . A plurality of lens portions 49 are provided on the bottom wall surface 41 b , and each lens portion 49 is provided at a position corresponding to each light emitting element 30 . The lens portion 49 is preferably integrally molded with the bottom wall 41 when the lens case 40 is injection molded. good too.

Since the circuit board 20 is provided with wiring (not shown) for supplying power to the light emitting elements 30, when external light such as sunlight is incident on the circuit board 20, it is reflected by the wiring and is visually recognized as reflected light. It will be done. Therefore, the lens case 40 is provided with a louver 50 that suppresses the reflection of the external light on the circuit board 20 by suppressing the incidence of the external light on the circuit board 20 .

The louver 50 is manufactured by injection molding a black resin material, and has a mask 51 that covers the circuit board 20 and a connecting portion 52 that connects the mask 51 to the lens case 40 . The mask 51 is provided so as to extend along a plane parallel to the bottom wall 41 of the lens case 40, and the mask back surface 51a facing the bottom wall surface 41b and the mask back surface 51a are arranged in the thickness direction of the mask 51. It has a mask surface 51b located on the opposite side.

The mask 51 is provided in the lens case 40 via a connecting portion 52 provided on the mask back surface 51a with a gap CL provided between the mask back surface 51a and the bottom wall surface 41b. The connection portion 52 is preferably integrally molded with the mask 51 when the louver 50 is injection molded, but the connection portion 52 and the mask 51 may be separately manufactured and then attached to the mask 51 .

A plurality of openings 53 are provided in the mask 51 , and each opening 53 is provided at a position corresponding to each lens portion 49 . Each opening 53 penetrates from the mask front surface 51b to the mask back surface 51a. As described above, since each lens portion 49 is provided at a position corresponding to each light emitting element 30, each opening 53 is provided at a position corresponding to each light emitting element 30. .

As shown in FIG. 2, the mask surface 51b is preferably provided with a plurality of horizontally extending grooves in order to efficiently suppress the reflection of external light. It can be a face. In addition, texturing may be applied to the mask surface 51b. In addition, in FIG. 2, in order to represent the positional relationship between the connection portion 52 and the opening portion 53, the portion of the mask back surface 51a where the connection portion 52 is provided is indicated by a dashed line.

As described above, each opening 53 penetrates from the mask front surface 51b to the mask back surface 51a. As shown in FIG. 3, the opening 53 has an inner peripheral surface 53c. The inner peripheral surface 53c is a first peripheral edge portion 53a, which is the peripheral edge portion on the mask back surface 51a side, and a peripheral edge portion on the mask front surface 51b side. It has a second peripheral portion 53b.

An inner peripheral surface 53 c of the opening 53 is provided with an inclined portion 54 . The inclined portion 54 is provided in a portion of the inner peripheral surface 53c of the opening 53 located vertically downward. The inclined portion 54 is inclined such that the distance from the optical axis LA in the direction orthogonal to the optical axis LA (vertical direction) increases as it approaches the mask back surface 51a. That is, the inclined portion 54 is inclined so as to be located downward in the vertical direction as it approaches the back surface 51a of the mask.

Further, assuming that the center portion between the first peripheral edge portion 53a and the second peripheral edge portion 53b in the direction parallel to the optical axis LA is the center portion C1, the inclined portion 54 is the center portion C1 and the second edge portion of the inner peripheral surface 53c. It is provided between one peripheral edge portions 53a.

When manufacturing the mask 51, the mask 51 is divided into two parts in the thickness direction of the mask 51 at the central part C1, and the part constituting the mask back surface 51a to the central part C1 and the part constituting the mask front surface 51b to the central part are separated. , and then the parts are joined together to form an integral mask 51 . In such a case, according to the first embodiment, it is possible to suppress unevenness in the inclined portion 54 due to individual differences and variations in manufacturing work.

FIG. 4 shows a partially enlarged backside view of a part of the mask 51 viewed from the backside. As shown in FIG. 4, the inclined portion 54 is provided on the inner peripheral surface 53c of the opening 53 at a lower portion in the vertical direction.

Next, FIG. 5A shows a partially enlarged cross-sectional view showing an enlarged region B shown in FIG. 3, and FIG. FIG. 5 shows a partially enlarged sectional view corresponding to FIG. 5( a ) of the display unit 1 ;

As shown in FIG. 5B, the display unit 1 according to the comparative example is provided with a mask 91 that covers the circuit board 20 and a louver 90 that has a connection portion 92 that connects the mask 91 to the lens case 40 . . The mask 91 according to the comparative example has a mask back surface 91a facing the bottom wall surface 41b, a mask front surface 91b located on the opposite side to the mask back surface 91a in the thickness direction of the mask 91, and from the mask back surface 91a to the mask front surface 91b. It has an opening 93 therethrough. In the display unit 1 according to the comparative example, since the inner peripheral surface 93c of the opening 93 extends in the same direction as the optical axis LA of the light emitting element 30, the peripheral edge portion of the inner peripheral surface 93c on the side of the mask back surface 91a In this case, the inner peripheral surface 93c and the mask back surface 91a are perpendicular to each other.

In the display unit 1 according to such a comparative example, when water droplets WT2 such as raindrops adhere to the inner peripheral surface 93c during rainfall, some of the water droplets WT2 move to the mask rear surface 91a through the peripheral edge portion. When moving along the peripheral portion in this manner, the water droplet WT2 moves closer to the lens portion 49 along the direction parallel to the optical axis LA. Therefore, depending on how the water droplet WT2 moves, part of the water droplet WT2 may adhere to the lens portion 49, and the water droplet WT2 may be sandwiched between the peripheral edge portion and the lens portion 49. FIG. If the water droplet WT2 is caught between the peripheral portion and the lens portion 49, it becomes difficult for the water droplet WT2 to move to the mask back surface 91a and stay there. When the water droplets WT2 adhere to the lens portion 49 in this way, the water droplets WT2 distort the optical path of the light emitted from the light emitting element 30, and the brightness of the light emitted from the light emitting element 30 in the front direction changes. There is a risk.

On the other hand, as shown in FIG. 5A, in the display unit 10 according to the first embodiment, part of the water droplet WT1 adhering to the opening 53 travels along the inclined portion 54 and reaches the back surface 51a of the mask. Moving. The inclined portion 54 is inclined so that the distance from the optical axis LA in the direction orthogonal to the optical axis LA increases as it approaches the mask back surface 51a. In other words, the inclined portion 54 is inclined downward in the vertical direction as it approaches the back surface 51a of the mask.

Therefore, the water droplet WT1 is guided downward in the vertical direction as the distance to the lens portion 49 in the direction of the optical axis LA decreases. Since the weight of the water droplet WT1 promotes downward movement in the vertical direction, it is possible to prevent the water droplet WT1 from remaining between the mask and the lens portion.

The water droplet WT1 that has reached the back surface 51a of the mask moves downward in the vertical direction through the gap CL while traveling along the back surface 51a of the mask. be done.

Thus, according to the display unit 10 according to the first embodiment, it is possible to prevent the water droplet WT1 from being caught between the first peripheral portion 53a and the lens portion 49. FIG. Therefore, it is possible to suppress the staying of the water droplets WT1, and it is possible to suppress the distortion of the optical path of the emitted light due to the water droplets WT1.

In particular, when the display device 100 is used as a road information display device, it is required to display information on the image display surface 11 more accurately than when the display device 100 is used as a display device other than the road information display device. In this regard, in Embodiment 1, water droplets can be prevented from adhering and staying between the first peripheral portion 53a of the opening 53 and the lens portion 49. It is possible to suppress a change in luminance of emitted light. Therefore, it can be suitably used as a road information display device.

According to the first embodiment described above, the following effects can be obtained.
(1) At least some of the water droplets adhering to the opening 53 during rain or the like move along the inner peripheral surface 53c of the opening 53 toward the first peripheral edge 53a. Water droplets running along the inclined portion 54 are guided to move in a direction in which the distance from the lens portion 49 in the direction perpendicular to the optical axis LA increases as they approach the mask back surface 51a. Therefore, water droplets are less likely to adhere to the lens portion 49 than in the comparative example in which the inner peripheral surface 93 extends parallel to the optical axis LA. Therefore, it is possible to prevent water droplets from being caught between the first peripheral portion 53a and the lens portion 49 and staying there.

(2) The aperture 53 is required to have a small cross-sectional area in a plane parallel to the image display surface 11 in order to improve the contrast. However, when the cross-sectional area of the opening 53 is reduced, the possibility of water droplets adhering in a film increases. Therefore, if the opening area is reduced in the display device 1 in which the inner peripheral surface 93c extends parallel to the horizontal direction as in the comparative example, as shown by the water droplets WT3 in FIG. There is a possibility that it will adhere to the periphery of the opening 93 on the side of the back surface 91a of the mask in the form of a film. In this regard, according to the first embodiment, the width dimension W2 (see FIG. 3) of the opening 53 in the second peripheral portion 53b is set to the same size as in the conventional art, while the width of the opening 53 in the first peripheral portion 53a is The width dimension W1 (see FIG. 3) can be made larger than before. Therefore, deterioration of contrast can be suppressed, and water droplets can be prevented from adhering to the first peripheral portion 53a in a film form.

(Embodiment 2)
The display unit 10 and the display device 100 of the second embodiment will be described with a focus on differences from the first embodiment with reference to FIGS. 1 to 5 and also FIG. In addition, unless otherwise specified, the same reference numerals denote the same configuration, and detailed description thereof will be omitted as appropriate.

FIG. 6 shows a sectional view corresponding to FIG. 3 of the display unit 10 according to the second embodiment. As shown in FIG. 6, the opening 56 penetrates the mask portion 51 in the second embodiment. The opening 56 has an inner peripheral surface 56c, and the inner peripheral surface 56c has a first peripheral edge portion 56a that is the peripheral edge portion on the mask back surface 51a side and a second peripheral edge portion 56b that is the peripheral edge portion on the mask front surface 51b side.

A slant portion 57 is provided in a vertically downward portion of the inner peripheral surface 56c. The inclined portion 57 is inclined so that the distance from the optical axis LA in the direction orthogonal to the optical axis LA increases as it approaches the mask back surface 51a. In other words, the inclined portion 57 is inclined downward in the vertical direction as it approaches the first peripheral portion 56a. Such an inclined portion 57 is provided from the first peripheral edge portion 56a to the second peripheral edge portion 56b.

According to the second embodiment described above, in addition to the effects (1) and (2) described in the first embodiment, the following effects can be obtained.

(3) In the second embodiment, since the inclined portion 57 is provided from the first peripheral edge portion 56a to the second peripheral edge portion 56b, water droplets adhering to the portion located below the inner peripheral surface 56c in the vertical direction , it can move to the first peripheral portion 56a by its own weight. Therefore, it is possible to prevent the water droplets from remaining on the inner peripheral surface 56c.

(Embodiment 3)
The display unit 10 and the display device 100 of the third embodiment will be described with a focus on differences from the first embodiment with reference to FIGS. 1 to 5 and also FIG. In addition, unless otherwise specified, the same reference numerals denote the same configuration, and detailed description thereof will be omitted as appropriate.

FIG. 7 shows a cross-sectional view corresponding to FIG. 3 of the display unit 10 according to the third embodiment. In Embodiment 3, the opening 58 is provided so as to penetrate the mask portion 51, and the opening 58 has an inner peripheral surface 58c. The inner peripheral surface 58c has a first peripheral edge portion 58a that is the peripheral edge portion on the mask back surface 51a side and a second peripheral edge portion 58b that is the peripheral edge portion on the mask front surface 51b side.

As shown in FIG. 7, an inclined portion 59 is provided on the inner peripheral surface 58c. The inclined portion 59 according to the third embodiment is provided over the entire circumference of the cross section in the direction orthogonal to the optical axis LA of the inner peripheral surface 58c.
Further, assuming that the center portion between the first peripheral edge portion 58a and the second peripheral edge portion 58b in the direction parallel to the optical axis LA is the center portion C1, the inclined portion 59 is formed between the center portion C1 and the second peripheral edge portion 58c of the inner peripheral surface 58c. It is provided between one peripheral edge portions 58a. The inclined portion 59 is inclined so that the distance from the optical axis LA in the direction orthogonal to the optical axis LA increases as it approaches the mask back surface 51a.

According to the third embodiment described above, in addition to the effects (1) and (2) described in the first embodiment, the following effects can be obtained.

(4) Since the inclined portion 59 is provided over the entire circumference of the cross section of the inner peripheral surface 58c in the direction orthogonal to the optical axis LA, the inclined portion is partially provided in the cross section of the inner peripheral surface 58c in the direction orthogonal to the optical axis LA. The cross-sectional area of the opening 58 in the first peripheral portion 58a can be made larger than when the is provided. Therefore, it is possible to more effectively suppress the film-like adhesion of the water droplets WT3 to the first peripheral portion 58a.

(Embodiment 4)
The display unit 10 and the display device 100 of the fourth embodiment will be described with reference to FIG. 8 in addition to FIGS. 1 to 5 and 7, focusing on differences from the third embodiment. In addition, unless otherwise specified, the same reference numerals denote the same configuration, and detailed description thereof will be omitted as appropriate.

FIG. 8 shows a sectional view corresponding to FIG. 3 of the display unit 10 according to the fourth embodiment. In Embodiment 4, the opening 60 is provided so as to penetrate the mask portion 51 . The opening 60 has an inner peripheral surface 60c, and the inner peripheral surface 60c has a first peripheral edge portion 60a that is a peripheral edge portion on the mask back surface 51a side and a second peripheral edge portion 60b that is a peripheral edge portion on the mask front surface 51b side. .

In the fourth embodiment, the inclined portion 61 is provided over the entire circumference of the cross section of the inner peripheral surface 60c in the direction perpendicular to the optical axis LA. The inclined portion 61 is provided from the first peripheral edge portion 60a to the second peripheral edge portion 60b. Therefore, in the fourth embodiment, the entire inner peripheral surface 60 c is configured as the inclined portion 61 . The inclined portion 61 is inclined so that the distance from the optical axis LA in the direction orthogonal to the optical axis LA increases as it approaches the mask back surface 51a.

According to the fourth embodiment described above, the effects (1) to (4) described in the first to third embodiments can be achieved.

(Other embodiments)
- Although the center part between the 1st peripheral edge part 53a and the 2nd peripheral edge part 53b was made into the center part C1 in the inner peripheral surface 53c in the said Embodiment 1, this invention is not restricted to this. A position shifted toward the first peripheral edge portion 53a from the central portion between the first peripheral edge portion 53a and the second peripheral edge portion 53b may be the central portion C1, or an intermediate position between the first peripheral edge portion 53a and the second peripheral edge portion 53b. A position shifted further toward the second peripheral portion 53b may be set as the central portion C1. Similarly, in the third embodiment described above, the position shifted toward the first peripheral edge portion 58a from the center portion between the first peripheral edge portion 58a and the second peripheral edge portion 58b may be the central portion C1, or the first peripheral edge A position shifted toward the second peripheral edge portion 58b from the central portion between the portion 58a and the second peripheral edge portion 58b may be defined as the central portion C1.

- In each of the above-described embodiments, the louver 50 including the flat mask 51 has been described, but the present invention is not limited to this, and more effectively suppresses external light from entering the circuit board 20. Therefore, the mask surface 51b may be provided with an eaves projecting in a direction perpendicular to the mask 51. FIG.

- In each of the above embodiments, the shape of the opening 53 is circular, but the shape of the opening 53 of the present invention is not limited to circular, and may be elliptical or rectangular.

- In each of the above-described embodiments and modifications, a 3-in-1 type LED element containing LED chips of R (red), G (green) and B (blue) was used as the light emitting element 30. However, the present invention The light emitting element 30 is not limited to this, and a 1-in-1 type LED element may be used.

- In each of the above-described embodiments and modifications, an example in which seven light-emitting elements 30 are arranged in the horizontal direction and seven in the vertical direction has been described, but the number of light-emitting elements 30 provided on the circuit board 20 can be changed as appropriate. can do.

Reference Signs List 1 display unit 10 display unit 11 image display surface 20 circuit board 22 mounting surface 30 light emitting element 40 lens case 41 bottom wall 41a bottom wall rear surface 41b bottom wall surface 42 opening 49 lens portion , 50 louver, 51 mask, 51a back surface of mask, 51b front surface of mask, 52 connecting portion, 53 opening, 53a first peripheral edge, 53b second peripheral edge, 53c inner peripheral surface, 54 inclined portion, 56 opening, 56a third 1 peripheral edge 56b second peripheral edge 56c inner peripheral surface 57 inclined portion 58 opening 58a first peripheral edge 58b second peripheral edge 58c inner peripheral surface 59 inclined portion 60 opening 60a third 1 peripheral edge portion 60b second peripheral edge portion 60c inner peripheral surface 61 inclined portion 90 louver 91 mask 91a mask back surface 91b mask front surface 92 connecting portion 93 opening 93c inner peripheral surface display device 100, A display surface 101 and a support frame 200 .

Claims (6)

a box-shaped lens case having a translucent bottom wall;
a circuit board having a mounting surface, which is accommodated in the lens case so that the mounting surface faces the bottom wall;
a plurality of light emitting elements provided on the mounting surface of the circuit board;
Among the surfaces forming the bottom wall of the lens case, the bottom wall surface facing the circuit board and the bottom wall surface located on the opposite side in the thickness direction of the bottom wall are provided on the light emitting element. lens units provided at corresponding positions;
a mask provided to face the bottom wall surface with a gap provided therebetween; and a louver having a connection portion connecting the mask to the bottom wall surface,
The mask has a mask back surface that faces the bottom wall surface and a mask surface that is located on the opposite side of the mask back surface in the thickness direction of the mask, and has a plurality of mask surfaces penetrating from the mask surface to the mask back surface. having an opening,
The openings are provided at positions respectively corresponding to the lens units,
An inclined portion is provided on the inner peripheral surface of the opening,
The inclined portion is inclined such that a distance between the optical axis of the light emitting element and the optical axis in a direction perpendicular to the optical axis of the light emitting element increases as the distance from the mask front surface toward the mask back surface increases. A display unit provided over the entire cross section of the inner peripheral surface in a direction orthogonal to the axis . The display unit according to claim 1, wherein the inclined portion is provided in a portion of the inner peripheral surface located vertically downward. The inner peripheral surface has a first peripheral edge portion that is a peripheral edge portion on the back surface side of the mask,
The display unit according to claim 1 or 2, wherein the inclined portion is provided between the central portion of the inner peripheral surface and the first peripheral edge portion in a direction parallel to the optical axis. The inner peripheral surface has a first peripheral edge portion that is a peripheral edge portion on the back surface side of the mask and a second peripheral edge portion that is a peripheral edge portion on the front surface side of the mask,
The display unit according to claim 1 or 2, wherein the inclined portion is provided from the first peripheral portion to the second peripheral portion. A display device comprising a plurality of display units according to any one of claims 1 to 4 . A road information display device comprising a plurality of display units according to any one of claims 1 to 4 .

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