JP2022094604A - Display device - Google Patents

Abstract

To reduce the size of a device in the thickness direction of a display part.SOLUTION: A display part 21 for emitting light and performing display comprises a board 22, a plurality of light sources 25, and an eaves 30 for each light source 25. The board 22 is arranged in the state of following a vertical line VL and has one surface in the thickness direction of itself as a board front 22F. The plurality of light sources 25 are arranged on the board front 22F, with each eaves 30 covering each light source 25 from above. A direction extending in the horizontal direction along the board front 22F is assumed as the width direction of the light sources 25, and faces on both sides of each light source 25 in said width direction are assumed as side faces 25S. Each eaves 30 includes a body part 31, a forward extension part 32 and a pair of lateral extension parts 33. The body part 31 adjoins upward of each light source 25. The forward extension part 32 is extended forward than the front 25F of the light source 25 from the body part 31. Each lateral extension part 33 is extended more than the side faces 25S of the light source 25 from the body part 31.SELECTED DRAWING: Figure 1

Description

The present invention relates to a display device including a display unit having a substrate and a plurality of light sources arranged on the front surface of the substrate, and displaying by causing each light source of the display unit to emit light.

Patent Document 1 describes an optical device for a vehicle. The optical device includes a substrate, a plurality of light sources, a plurality of lens members, a plurality of reflectors, and a plurality of light guide bodies.
The boards are arranged horizontally. A plurality of light sources are arranged on the lower surface of the substrate and emit light downward. The plurality of lens members are arranged in a row in the vertical direction with respect to the front of the vehicle with respect to the substrate. The display unit is composed of these lens members. Each reflector is located behind the vehicle of the corresponding lens member. Each light guide is arranged between each light source and each reflector.

According to the optical device, the light guide guides the light emitted by the light source to the corresponding reflector. The light emitted from the light guide is reflected by the reflector and passes through the lens member. Therefore, by controlling the operation of the light source, it is possible to display characters, images, and the like on the display unit.

Here, when the light source is not emitting light and the sunlight irradiating the optical device from diagonally above directly irradiates the lens member, the sunlight is reflected by the lens member. From the front of the vehicle, the reflected sunlight can be seen and the lens member looks bright. There is a possibility that a phenomenon in which a light source that does not emit light appears to emit light, so-called pseudo-emission, may occur.

Further, when sunlight directly irradiates the lens member while the light source is emitting light, the lens member looks bright as described above. However, the contrast of brightness between the lens member through which the light from the light source is transmitted and the lens member that does not transmit is small, and whether the bright phenomenon of the lens member is due to the irradiation of sunlight or the light emission of the light source. Difficult to distinguish. In order to make it easy to understand that the lens member is brightened by the light emission of the light source, it is necessary to make the light source emit light brighter, that is, to increase the brightness of the light source to increase the contrast. On the other hand, the power consumed by the light source increases.

Therefore, in the above optical device, a plurality of light-shielding members are provided. The light-shielding member is arranged above the lens member and projects from the lens member to the front of the vehicle. According to the above optical device, the light-shielding member suppresses direct sunlight from the lens member. Therefore, it is possible to make the pseudo-light emission less likely to occur, improve visibility, and reduce power consumption.

Japanese Unexamined Patent Publication No. 2020-59445

However, in the above optical device, a lens member, a reflector, and a light guide are arranged in front of the vehicle from the light source. Therefore, if the direction in which the light from the light source passes through the lens member and the expression are changed, the optical device becomes larger in the thickness direction of the display unit. Further, since the light-shielding member protrudes in front of the vehicle from the lens member, the optical device becomes larger. As a result, the mountability of the optical device on the vehicle is reduced. Such a problem may occur similarly when the optical device is mounted on something other than a vehicle.

The display device for solving the above problems includes a display unit that emits light to display, and the display unit is arranged along a vertical line or inclined with respect to the vertical line, and is one of the display units in its own thickness direction. A substrate having a surface as the front surface of the substrate and a plurality of light sources arranged on the front surface of the substrate are provided, and the display unit further includes an eaves covering each of the plurality of light sources from above, and is horizontal along the front surface of the substrate. When the direction extending in the direction is the width direction of the light source and the surfaces on both sides of each light source in the width direction are the side surfaces, each eaves has a main body portion adjacent to the upper side of each light source and the light source from the main body portion. It is provided with a front expansion portion that is extended forward from the front surface of the light source, and a pair of lateral expansion portions that are extended from the main body portion to both sides in the width direction from the side surface of the light source.

According to the above configuration, the eaves cover the corresponding light source from above. Unlike Patent Document 1, in which the lens member, which is a place where light is visually recognized, is arranged at a place away from the light source, the light source is visually recognized. The lens member, the reflector, and the light guide are not arranged in front of each light source. Further, the eaves do not protrude forward from the lens member.

Therefore, since there is no lens member, reflector, and light guide body, and the eaves do not protrude from the lens member, the size of the display device in the thickness direction of the display unit is smaller than that of Patent Document 1.
In the display device, a circuit unit including a plurality of circuit components is provided on the front surface of the substrate, and some of the circuit components among the plurality of circuit components have each light source above the eaves. It is preferable that the circuit board is arranged so as to cover the circuit board.

According to the above configuration, the circuit unit is composed of a plurality of circuit components arranged on the front surface of the substrate. Further, among the plurality of circuit components, the circuit components arranged at the locations covering each light source from above also function as eaves. Therefore, it is not necessary to provide eaves separately from the circuit components.

In the display device, it is preferable that the skeleton portion of the eaves is made of a base material, the base material is formed of a transparent resin material, and the light diffusing material is dispersed in the base material.
According to the above configuration, it is possible to assist the color synthesis of the light emitted by the light source below the eaves by the light diffusing material.

In the display device, it is preferable that the skeleton portion of the eave is composed of a base material, and a reflection suppression layer is formed on the upper surface of the base material in each of the front expansion portion and the bilateral expansion portion. ..

When the sunlight radiated from diagonally above the display device hits the front expansion part and the bilateral expansion part and is reflected, a part of the sunlight is not the light source for which the eaves block the sunlight, but the eaves. There is a risk of irradiating other light sources located above.

At this time, if the other light source does not emit light, it becomes brighter due to the reflected and irradiated sunlight as described above. Pseudo-emission occurs with the above other light sources.
Further, in order to make it easy to understand that the other light sources are brightened by light emission, if the same light source is made to emit light brighter, the power consumption is increased.

On the other hand, according to the above configuration, the phenomenon that the irradiated sunlight is reflected is suppressed by the reflection suppressing layer in each of the front expansion portion and the bilateral expansion portion. Therefore, it is suppressed that sunlight irradiates the other light sources. Pseudo emission of a light source that does not emit light is suppressed. In addition, it is not necessary to make the light source that emits light emit brighter light.

In the display device, it is preferable that the extension length of the front expansion portion from the main body portion to the front is set to a value in which sunlight is blocked by the front expansion portion and does not directly reach the light source.

By setting the extension length of the front expansion portion from the main body portion to the front so as to satisfy the above conditions, it is possible to suppress the direct irradiation of the light source from the diagonally upward front.
In the display device, the extension length of each lateral expansion portion from the main body portion to the side is set to a value at which sunlight is blocked by the lateral expansion portion and does not directly reach the light source. Is preferable.

By setting the extension length from the main body portion to the side of the lateral expansion portion so as to satisfy the above conditions, it is possible to suppress the direct irradiation of sunlight from the diagonally upper side to the light source.

According to the above display device, visibility can be ensured by preventing a decrease in contrast due to pseudo light emission, and power consumption can be reduced. Further, it is possible to reduce the size of the device in the thickness direction of the display unit.

It is a figure which shows the 1st Embodiment of a display device, and is the partial side view which shows the state which the display device is mounted on a vehicle. The partial plan view which shows the state which the display device of 1st Embodiment is mounted on a vehicle. In the display device of 1st Embodiment, the partial side view explaining the extension length of the anterior extension part from the main body part forward. The partial front view explaining the lateral extension length of each side extension part from the main body part in the display device of 1st Embodiment. It is a figure which shows the 2nd Embodiment of a display device, and is the partial side view which shows the state which the display device is mounted on a vehicle. The side view of the display device in 3rd Embodiment.

(First Embodiment)
Hereinafter, the first embodiment of the display device will be described with reference to FIGS. 1 to 4. In addition, in FIGS. 2 and 4, the illustration of the packed bed 46, the outer panel 47, and the top coat layer 48, which will be described later, is omitted. This point is the same for FIG. 6, which shows the third embodiment described later.

As shown in FIGS. 1 and 2, the display device 20 is mounted on the exterior portion of the vehicle 10, for example, the front portion, the rear surface portion, the side surface portion, and the like. In the first embodiment, the display device 20 is mounted on the front surface portion 10F of the vehicle 10.

The display device 20 includes a display unit 21 that emits light to display. The display unit 21 includes a substrate 22 and a plurality of light sources 25.
The substrate 22 is arranged along the vertical line VL, that is, in a vertical state. Further, the substrate 22 has its own thickness direction as the front-rear direction, and has one surface in the same direction as the substrate front surface 22F. In each figure, "front", "rear", "top", "bottom", "left", and "right" are described in order to explain the positional relationship of the display device 20. These indicate the direction. In the first embodiment, these directions match the direction of the vehicle 10. It is assumed that "left" and "right" correspond to "left" and "right" when the vehicle 10 moves forward.

Each light source 25 is composed of a light emitting diode (LED) chip. Each light source 25 includes a light emitting portion 26 and a sealing portion 27 laminated on the front surface of the light emitting portion 26, and has a rectangular plate shape as a whole (see FIG. 4). An LED element, an IC for controlling the LED element, and the like are mounted on the light emitting unit 26. The sealing portion 27 is formed of a transparent resin material such as a transparent epoxy resin, and has a function of protecting the light emitting portion 26 from dust, water, and the like.

Here, the direction extending horizontally along the front surface 22F of the substrate is the width direction of the light source 25, and the surfaces on both sides of the light source 25 in the same width direction are the side surfaces 25S, respectively.
The plurality of light sources 25 are arranged on the front surface 22F of the substrate in a state of being separated from each other in the vertical direction (see FIG. 1). Further, although not shown, the plurality of light sources 25 are arranged so as to be separated from each other in the width direction. In this way, the display unit 21 has the same configuration as the LED matrix panel, and by controlling the operation of each of the plurality of light sources 25, information can be displayed using characters, numbers, figures, symbols, and the like. It is possible.

The display device 20 further includes an eaves 30 that covers each light source 25 from above. The skeleton portion of each eaves 30 is composed of the base material 35. The base material 35 is formed of a transparent resin material such as a polycarbonate resin (PC). A light diffusing material (not shown) is dispersed in the base material 35. As the light diffusing material, particles having a refractive index different from that of the base material 35 can be used. For example, glass beads, resin powder and the like are used as the light diffusing material.

Each eave 30 includes a main body portion 31, a front expansion portion 32, a pair of side expansion portions 33, and a pair of connection expansion portions 34.
As shown in FIGS. 2 to 4, the main body portion 31 for each eaves 30 projects forward from the substrate front surface 22F of the substrate 22. The main body 31 for each eaves 30 is adjacent above the corresponding light source 25. The front expansion portion 32 for each eaves 30 is extended forward from the main body portion 31 to the front surface 25F of the light source 25. A pair of lateral expansion portions 33 for each eaves 30 are extended from the main body portion 31 to both sides in the width direction from the side surface 25S of the light source 25. Each of the pair of connecting expansion portions 34 for each eaves 30 is located between the front expansion portion 32 and the side expansion portion 33, and connects the two (see FIG. 2).

The lower surface 35B of the base material 35 is composed of a horizontal surface or a nearly horizontal inclined surface. The lower surface 35B is separated upward by a slight gap G from the upper surface 25T of the light source 25 located directly below the eaves 30.

The upper surface 35T (see FIG. 3) of the base material 35 in the front expansion portion 32 and both connecting expansion portions 34 is provided on both the vertical line VL and the horizontal plane HP so that the protrusion length from the main body portion 31 to the front becomes longer toward the bottom. On the other hand, it is tilted at a certain angle. This is to allow a person in front of the vehicle 10 to see the light source 25 directly above the eaves 30 when looking up at the display device 20. In other words, the upper surface 35T, more accurately, the reflection suppression layer 45 described later on the upper surface 35T does not interfere with viewing the light source 25 directly above the eaves 30.

Let L1 be the forward extension length of the front expansion portion 32 from the main body portion 31. Further, the extension length from the main body portion 31 to the side of each side expansion portion 33 is L2. The extended lengths L1 and L2 are set to values where the sunlight SL is blocked by the eaves 30 and does not directly reach the light source 25, respectively. This setting is set so that the following conditions are satisfied.

Condition: It is easy to see the light emission state of the light source 25 even during the daytime when the illuminance is high.
Illuminance is a physical quantity that represents the brightness of light that illuminates the surface of an object, that is, the degree of brightness on the surface illuminated by light. Illuminance is expressed in units of candela.

The solar SL directly irradiates the exterior portion of the vehicle 10 traveling outdoors, and the display device 20 mounted on the front portion 10F in the first embodiment. When the sunlight SL directly irradiates the light source 25 that does not emit light, the light source 25 emits pseudo light. The contrast of brightness between the light source 25 that emits light and the light source 25 that does not emit light becomes small, and it becomes difficult to distinguish whether the light source 25 is emitting light or not. Visibility can be ensured by making the light source 25 that emits light emit light brighter, but there is a problem that power consumption increases.

Here, as shown in FIGS. 3 and 4, the angle formed by the position of the sun seen by a person outside the vehicle 10 with respect to the horizon, or, in other words, the angle formed by the solar SL with respect to the horizontal plane HP, is the solar zenith angle. If it is H, the surface illuminance differs depending on the solar altitude H. In addition, the solar zenith angle H varies depending on the season and time zone. The solar zenith angle H reaches its maximum at noon in the day. The solar zenith angle H is maximum (50 degrees or more) at the summer solstice and minimum (50 degrees or less) at the winter solstice. Assuming that the surface illuminance at noon on the summer solstice is 130,000 candelas, the surface illuminance at noon on the winter solstice is 16,000 candelas, and the amount of sunlight SL reflected by the light source 25 is reduced. As a tentative guide, when the solar altitude H is 45 degrees or higher, if the solar SL is blocked by the eaves 30 so as not to directly irradiate the light source 25, it is considered that the pseudo light emission of the light source 25 can be effectively suppressed. ..

The following relational expression holds between the solar altitude H, the vertical length A of the light source 25, the gap G between the eaves 30 and the light source 25, and the extended lengths L1 and L2.
tanH = (A + G) / L1
tanH = (A + G) / L2
By modifying the above relational expressions, the following (Equation 1) and (Equation 2) can be obtained.

L1 = (A + G) / tanH ... (Equation 1)
L2 = (A + G) / tanH ... (Equation 2)
For example, A = 2.0 mm, G = 0.2 mm, and H = 45 degrees. The forward extension length L1 from the main body 31 and the lateral extension length L2 from the main body 31 are both 2.2 mm. When the extended lengths L1 and L2 are set to the above values (2.2 mm), the solar SL does not directly irradiate the light source 25 when the solar altitude H is 45 degrees or more.

When the solar altitude H is smaller than 45 degrees, the solar SL reaching the ground surface is weaker than when it is 45 degrees or higher, so that even if pseudo-light emission occurs, it is not noticeable and does not pose a problem.
As shown in FIGS. 1 and 3, of the upper surface 35T of the base material 35, the reflection suppression layer 45 is formed on at least the front expansion portion 32, the bilateral expansion portions 33, and the upper surface 35T of both connecting expansion portions 34. There is. The reflection suppression layer 45 may or may not be formed on the upper surface 35T of the base material 35 in the main body 31. The reflection suppression layer 45 may have a function of suppressing the reflection of the irradiated sunlight SL. In the first embodiment, the reflection suppression layer 45 is formed by applying the reflection suppression paint to the upper surface 35T of the base material 35.

An outer panel 47 and a top coat layer 48 are provided in front of the substrate 22 via a packed bed 46.
The outer panel 47 is made of a transparent resin material. The packed bed 46 is formed in a state where the substrate 22, all the light sources 25, all the eaves 30, and the outer panel 47 are completely filled. The packed bed 46 is made of a material having high visible light transmission performance. As a material satisfying this condition, for example, a transparent resin material is used. It is desirable that the resin material has a refractive index close to that of the outer panel 47. By reducing the difference in refractive index, it is possible to suppress reflection at the interface between the outer panel 47 and the packed bed 46. Further, the packed layer 46 may be formed by using a transparent resin material in which a light dispersant is dispersed, provided that the material transmits visible light.

The top coat layer 48 is formed on the front surface of the outer panel 47 and is located on the front surface of the display device 20. The top coat layer 48 is formed, for example, by applying a reflection inhibitor material to the front surface or the back surface of the outer panel 47. Further, a variable permeable membrane may be used as the top coat layer 48.

Next, the operation of the first embodiment configured as described above will be described. In addition, the effects caused by the action will also be described.
When the solar SL is irradiated from diagonally above the display device 20, the solar SL is blocked by the eaves 30. That is, as shown in FIGS. 1 and 3, in the first embodiment, the forward extension length L1 of the front expansion portion 32 from the main body portion 31 satisfies the above (Equation 1). Therefore, when the solar altitude H is 45 degrees or more, that is, when the solar SL irradiates the display device 20 from diagonally above and forward at an angle of 45 degrees or more with respect to the horizontal plane HP, the solar SL expands forward. It is blocked by the portion 32. It is suppressed that the sunlight SL directly irradiates the light source 25 from diagonally above and forward.

Further, as shown in FIGS. 2 and 4, in the first embodiment, the lateral extension length L2 from each side expansion portion 33 from the main body portion 31 satisfies the above (formula 2). Therefore, when the solar altitude H is 45 degrees or more, that is, when the solar SL irradiates the display device 20 from diagonally upper side at an angle of 45 degrees or more with respect to the horizontal plane HP, the solar SL is lateral. It is blocked by the expansion unit 33. It is suppressed that the solar SL directly irradiates the light source 25 from the diagonally upper side.

Since the light source 25 that does not emit light is less likely to emit pseudo light, the contrast between the brightness of the light source 25 that emits light and the brightness of the light source 25 that does not emit light becomes large, and the visibility is improved. In addition, less power is required to cause the light source 25 to emit light.

In particular, when the vehicle 10 is an electric vehicle using a battery as a power source, the power consumption can be reduced and the load on the battery can be reduced.
Here, a part of the sunlight SL irradiated from diagonally above the display device 20 hits the upper surface of the eaves 30. If the sunlight SL is temporarily reflected on the upper surface of the eaves 30, the reflected sunlight SL may be seen by a person looking at the display device 20. In this case, the reflected sunlight SL looks dazzling, and the visibility of the display unit 21 may be impaired.

In this respect, in the first embodiment, the reflection of the sunlight SL on the upper surface of the eaves 30 is suppressed by the reflection suppressing layer 45. Therefore, the above-mentioned phenomenon that the reflected sunlight SL looks dazzling is suppressed, and the visibility of the display unit 21 is unlikely to be impaired. Therefore, visibility can be improved in this respect as well.

Further, the base material 35 in each eaves 30 is formed of a transparent resin material, and the light diffusing material is dispersed in the base material 35. Unlike the upper surface 35T, the reflection suppression layer 45 is not formed on the lower surface of the base material 35. Therefore, it is possible to assist the color synthesis of the light emitted by the light source 25 below the eaves 30 with the light diffusing material.

By the way, in the first embodiment, the eaves 30 project forward from the front surface 22F of the substrate and directly cover the light source 25 from above. Unlike Patent Document 1, in which the lens member, which is a place where light is visually recognized, is arranged at a place away from the light source (substrate), the light source 25 is visually recognized. In the first embodiment, the lens member, the reflector, and the light guide are not arranged in front of each light source 25. Further, the eaves 30 do not project forward from the lens member.

Therefore, since there are no lens members, reflectors, and light guides, and the eaves 30 do not protrude from the lens members, in the first embodiment, the display device 20 in the thickness direction of the display unit 21 is compared with the patent document 1. The dimensions become smaller. Although the mounting space of the display device 20 is small on the front surface portion 10F of the vehicle 10, the display device 20 of the first embodiment can be mounted or easily mounted in the mounting space. As described above, according to the first embodiment, the mountability of the display device 20 on the front surface portion 10F of the vehicle 10 is improved.

According to the first embodiment, the following effects can be obtained in addition to the above.
-In the first embodiment, the top coat layer 48 made of the reflection suppressing material is formed on the foremost surface of the display device 20 where the sunlight SL is directly irradiated. Therefore, the reflection of the sunlight SL on the front surface of the display device 20 can be suppressed by the top coat layer 48, and the deterioration of visibility due to the reflection of the sunlight SL outdoors during the day can be suppressed.

-In the first embodiment, since the packed layer 46 is provided between the display unit 21 and the outer panel 47, it is possible to prevent dust, dust, insects, water, etc. from entering the display unit 21.
-By providing the packed layer 46, an air layer cannot be formed between the outer panel 47 and the substrate 22. Heat conduction is better than when an air layer is formed. Therefore, the heat generated by the light source 25 when energized can be quickly diffused. As a result, the influence of heat on the light source 25 can be reduced.

-In the first embodiment, the front expansion portion 32 and the both connecting expansion portions 34 are formed so that the thickness in the vertical direction increases toward the rear.
Therefore, the thicknesses of the front expansion portion 32 and both connection expansion portions 34 in the vertical direction are uniform, and the thickness thereof is the same as the thickness of the front end portion of the eaves 30, as compared with the case where the front expansion portion 32 and both connection expansion portions 32 have a uniform thickness. The strength of 34 can be increased.

-In the first embodiment, the eaves 30 are only arranged above each light source 25, and the eaves 30 are not arranged on the side of the light source 25. Therefore, the viewing angle in the horizontal direction can be wider than that in which the eaves are arranged on the side of the light source.

-In the first embodiment, unlike Patent Document 1, since the reflector and the light guide are not used, the display device 20 can be configured with a smaller number of parts.
-In order to prevent the solar SL from directly irradiating all the light sources 25 with one eave, it is necessary to project the eaves greatly forward. On the other hand, in the first embodiment, the eaves 30 are provided for each light source 25. Therefore, it is possible to suppress the direct irradiation of the sunlight SL to each light source 25 while suppressing the protrusion length of the eaves 30 to the front, and to improve the visibility.

(Second Embodiment)
Next, a second embodiment of the display device 20 will be described with reference to FIG.
The display device 20 of the second embodiment is mounted on a portion of the exterior portion of the vehicle 10 that is inclined with respect to the horizontal surface HP, for example, a bonnet or the like.

The substrate 22 of the display device 20 is attached to the exterior portion of the vehicle 10 in a state of being tilted with respect to the horizontal plane HP, and in a state of being tilted by about 35 degrees in the second embodiment.
The front-rear direction of the substrate 22 is inclined with respect to both the vertical straight line VL and the horizontal plane HP, and is different from the front-rear direction of the vehicle 10. The vertical direction of the substrate 22 is inclined with respect to both the vertical straight line VL and the horizontal plane HP, and is different from the vertical direction of the vehicle 10.

Therefore, in order to distinguish each direction on the substrate 22 from each direction on the vehicle 10, in FIG. 5, "front", "rear", "top", and "bottom" are "front" and "bottom" of the board 22. It indicates "rear", "upper", and "lower". Further, in FIG. 5, "(front)", "(rear)", "(top)", and "(bottom)" refer to "front", "rear", "top", and "bottom" of the vehicle 10. Shows.

The eaves 30 for each light source 25 include a main body portion 31, a front expansion portion 32, a pair of side expansion portions 33, and a pair of connection expansion portions 34, as in the first embodiment.
The main body 31 for each eave 30 is the front surface 22F of the substrate, and projects forward from a portion adjacent to the upper side of each light source 25. Since the substrate 22 is tilted as described above, the main body 31 is also tilted with respect to both the vertical line VL and the horizontal plane HP.

The front expansion portion 32 for each eaves 30 is extended forward from the main body portion 31 to the front surface 25F of the light source 25. Although not shown, the bilateral expansion portions 33 for each eaves 30 are expanded from the main body portion 31 to both sides of the side surface 25S of the light source 25.

The upper surface 35T of the base material 35 in the front expansion portion 32 and the both connecting expansion portions 34 is composed of a horizontal surface or a sloping surface that is close to horizontal.
The lower surface 35B of the base material 35 in the front expansion portion 32 and both connecting expansion portions 34 is inclined with respect to the horizontal plane HP so as to be lower toward the rear. This is to allow a person outside (front) of the vehicle 10 to see the light source 25 when looking down at the display device 20. In other words, this is to prevent the lower surface 35B from obstructing the viewing of the light source 25 when the display device 20 is viewed from the front. The angle formed by the lower surface 35B with the horizontal plane HP is defined as the dihedral angle D1. For example, it is assumed that the display device 20 is mounted on the exterior portion of the vehicle 10 at a height of 1 meter from the ground surface. It is assumed that the display device 20 is viewed from a height of 2 meters at a location 5 meters forward from the vehicle 10, for example. The dihedral angle D1 is obtained by the following (Equation 3).

D1 = atan (1000/5000) ≒ 11.3 ... (Equation 3)
From the above (Equation 3), in the second embodiment, the dihedral angle D1 is set to, for example, about 12 degrees.

Since the upper surface 35T and the lower surface 35B are formed as described above, the thickness of each of the front expansion portion 32 and the both connecting expansion portions 34 in the vertical direction becomes larger toward the rear.
The configuration other than the above is the same as that of the first embodiment. Therefore, in the second embodiment, the same elements as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

Therefore, according to the second embodiment, the display device 20 is mounted on an inclined portion of the exterior portion of the vehicle 10, but has the same operation and effect as that of the first embodiment in which the display device 20 is mounted in a vertical state. Is obtained.

According to the second embodiment, the following actions and effects can be obtained in addition to the above.
When the sunlight SL irradiated from diagonally above the display device 20 is reflected on the upper surface of the eaves 30, a part of the sunlight SL is not the light source 25 that the eaves 30 blocks the sunlight SL, but the eaves. There is a risk of irradiating another light source 25 located above 30. In this case as well, the same phenomenon as when the sunlight SL directly irradiates the light source 25 may occur. That is, there is a possibility that pseudo light emission may occur at the light source 25 that does not emit light. Further, it is difficult to distinguish whether the phenomenon that the light source 25 is bright is due to the irradiation of the sunlight SL or the light emission of the light source 25. In order to make it easy to understand that the light source is brightened by light emission, it is necessary to make the light source 25 emit light brighter.

In this respect, in the second embodiment, the phenomenon that the sunlight SL irradiated on the upper surface of the eaves 30 is reflected is suppressed by the reflection suppressing layer 45. Therefore, it is suppressed that the sunlight SL irradiates the other light source 25. Pseudo light emission of the light source 25 that does not emit light is suppressed. Further, it is not necessary to make the light source 25 that emits light emit light brighter.

(Third Embodiment)
Next, a third embodiment of the display device 20 will be described with reference to FIG.
Although the description is omitted in the first embodiment, as shown in FIG. 6, a circuit unit 51 for controlling the operation of a plurality of light sources 25 is provided on the front surface 22F of the substrate. The circuit unit 51 includes a plurality of circuit components. One of the plurality of circuit components is composed of a noise absorbing capacitor 52. The capacitor 52 is arranged as an eave 30 at a position that covers each light source 25 from above. Instead of the capacitor 52, a circuit component such as an inductor or a diode may be used as the eaves 30.

The configuration other than the above is the same as that of the first embodiment. Therefore, in the third embodiment, the same elements as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.
Therefore, according to the third embodiment, the same actions and effects as those of the first embodiment can be obtained, and the following effects can be obtained.

A plurality of circuit components arranged on the front surface 22F of the board constitute the circuit unit 51. Further, among the plurality of circuit components, the capacitor 52 arranged at a position covering each light source 25 from above also functions as an eave 30. Therefore, it is not necessary to provide the eaves 30 separately from the circuit components.

-By using a capacitor 52 having a large heat capacity, it is possible to conduct and absorb the heat generated by the light source 25 due to energization. It is possible to alleviate the overall temperature rise of the display unit 21 due to the heat generation of the light source 25.

It should be noted that each of the above-described embodiments can also be implemented as a modified example in which the above-described embodiment is modified as follows. Each embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.

<About eaves 30>
-The lower surface 35B of the base material 35 of the eaves 30 may be provided with a light diffuse reflection structure for diffuse-reflecting the light irradiated on the lower surface. For example, the light diffusion reflection structure may be formed by roughening the lower surface 35B of the base material 35. Examples of the roughening method include etching, laser light irradiation, and blasting. Even in this way, the same actions and effects as in each of the above-described embodiments in which the light diffusing material is dispersed in the base material 35 made of a transparent resin material can be obtained.

-In the first and second embodiments, the eaves 30 may be formed of an opaque resin material as long as it has a light-shielding function.
-In the first embodiment, the lower surface 35B of the base material 35 of each eaves 30 may be inclined so as to be lower toward the rear as in the second embodiment.

-As shown in FIG. 6, the distance between the light sources 25 adjacent to each other in the vertical direction may be wider than that in the first and second embodiments.
-As shown in FIG. 6, the upper surface of the eaves 30 may be composed of a horizontal surface or a nearly horizontal inclined surface.

-In the first and second embodiments, each eaves 30 may be arranged in a state where the main body 31 is in contact with the upper surface 25T of the light source 25.
-In the third embodiment, the heat sink may be provided as an eave 30 at a position covering each light source 25 from above.

<About matters other than the above>
-In the first and second embodiments, a variable transmittance layer may be provided on the front surface or the back surface of the outer panel 47 so that the transmittance of light can be changed according to the energized state. The transmittance variable layer is energized so that the transmittance increases when the light source 25 emits light and the transmittance decreases when the light source 25 does not emit light. By this energization control, it is possible to improve the appearance of the vehicle appearance when the light source 25 does not emit light.

-In the first to third embodiments, at least one of the packed bed 46, the outer panel 47, and the topcoat layer 48 may be omitted.
-In the first and second embodiments, the connection expansion unit 34 may be omitted.

A light emitting element different from the LED may be used as the light source 25.
<Applicable target>
-The display device may be mounted on a portion of the exterior portion of the vehicle 10 that is different from the front portion 10F, for example, a side surface portion, a rear surface portion, or the like.

-The above display device can also be applied to a display device mounted on a vehicle other than the vehicle 10 and a display device mounted on a moving body other than the vehicle.
-The above display device can be applied not only to a moving body but also to a display device mounted on a fixed object installed outdoors. Applicable fixed objects include, for example, road signs installed on roads. Road signs include guide signs, warning signs, regulatory signs, instruction signs, and the like.

A guide sign is a road sign that provides a road user with information such as a direction and a distance to a destination or a passing point.
One of the guide signs includes a wall surface in the tunnel that is installed in front of the exit. Generally, when a vehicle exits a tunnel, the surroundings suddenly brighten. When sunlight is applied to the light source of the display device installed near the exit, it becomes difficult to see the displayed contents. Therefore, the visibility can be improved by using the display device of the present invention as a display device for a guide sign installed near the exit of the tunnel.

The warning sign is a road sign that gives notice of road conditions, places that hinder driving, and the like.
A regulation sign is a road sign that indicates a regulation for driving a vehicle.
The instruction sign is a road sign that indicates the main restrictions on the road surface when the vehicle is traveling.

Examples of fixed objects other than the above include signboards, outdoor advertisements, and the like. Signs are used for announcements, notifications, advertisements, advertisements, etc., and are usually in the shape of a plate. The signboard may, for example, post the name of a store or company existing in the place where the signboard is posted, or display a general advertisement. In addition, the signboard may display a route, an evacuation route, a warning, etc. Further, the above-mentioned fixed object also includes a signboard displaying a menu provided by the store, for example, a menu of dishes served at the restaurant. The display device of the present invention may be used as a display device in the above-mentioned fixed object.

20 ... Display device 21 ... Display unit 22 ... Board 22F ... Board front 25 ... Light source 25F ... Front 25S ... Side 30 ... Eaves 31 ... Main body 32 ... Front expansion 33 ... Side expansion 35 ... Base material 35T ... Top surface 45 … Reflection suppression layer 51… Circuit part 52… Capacitor (circuit component)
L1, L2 ... Extended length SL ... Sunlight VL ... Vertical line

Claims (6)

Equipped with a display unit that emits light to display
The display unit includes a substrate arranged along the vertical line or inclined with respect to the vertical line, and having one surface in the thickness direction of the substrate as the front surface of the substrate, and a plurality of light sources arranged on the front surface of the substrate. Equipped with
The display unit further includes eaves that cover each of the plurality of light sources from above.
When the direction extending horizontally along the front surface of the substrate is the width direction of the light source and the surfaces on both sides of each light source in the width direction are the side surfaces.
Each eave is
The main body adjacent to the top of each light source,
A front expansion portion that extends from the main body portion to the front of the front surface of the light source, and a front expansion portion.
A display device including a pair of lateral expansion portions extending from the main body portion to both sides in the width direction from the side surface of the light source. A circuit unit including a plurality of circuit components is provided on the front surface of the substrate.
The display device according to claim 1, wherein some of the circuit components among the plurality of circuit components are arranged as eaves at a location that covers each light source from above. The skeleton portion of the eaves is composed of a base material and is composed of a base material.
The substrate is made of a transparent resin material and is made of a transparent resin material.
The display device according to claim 1 or 2, wherein a light diffusing material is dispersed in the base material. The skeleton portion of the eaves is composed of a base material and is composed of a base material.
The display device according to claim 1 or 2, wherein a reflection suppression layer is formed on the upper surface of the base material in each of the front expansion portion and the bilateral expansion portion. One of claims 1 to 4, wherein the extension length from the main body portion to the front of the front expansion portion is set to a value in which sunlight is blocked by the front expansion portion and does not directly reach the light source. The display device described in the section. The extension length of each lateral expansion portion from the main body portion to the side is set to a value in which sunlight is blocked by the lateral expansion portion and does not directly reach the light source, according to claims 1 to 5. The display device according to any one of the following items.

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