Display device

Abstract

A display device is provided. The display device includes a light-transmitting portion, a display light source disposed on an inner side of the light-transmitting portion, and a housing accommodating the display light source and having the light-transmitting portion disposed in an opening portion. The light-transmitting part has a transparent resin base material, a first color-developing layer containing a dye or a pigment, and a second color-developing layer containing a filler comprising a cold mirror film. The first color-developing layer has a transmittance of light having a specific wavelength of 20% or more. The second chromogenic layer has a reflectance of 80% or less for light having a wavelength that is not absorbed by the dye or pigment of the first chromogenic layer, and a transmittance of 60% or more for light having a wavelength that is absorbed by the dye or pigment of the first chromogenic layer.

Description

Technical Field

[0001] The present disclosure relates to a display device mounted on, for example, a vehicle. Background Art

[0002] For example, Japanese Patent Application Publication No. 2022-35593 discloses a light-emitting grille as a display device mounted on a vehicle, for example. Such a light-emitting grille includes a light-transmitting cover and a light-emitting element disposed inside the cover. The light-emitting grille emits light at night through the light of the light-emitting element passing through the cover.

[0003] The light-emitting grille usually does not emit light during the day. If the light-emitting element is not emitting light and is irradiated with light from the outside, such as sunlight, a portion of the irradiated light passes through the outer cover and the rest is reflected by the outer cover. On the other hand, in a vehicle, there is a case where a hood is provided adjacent to the light-emitting grille. If light from the outside is irradiated to the hood, the hood reflects most of the irradiated light. Therefore, the appearance of the light-emitting grille is significantly different from that of the hood, and therefore there is a problem that the appearance of the vehicle provided with the light-emitting grille is deteriorated.

[0004] Such a problem is not limited to display devices installed in vehicles, but is also generally common to display devices installed in, for example, moving objects other than vehicles, or the outer wall of a building. Summary of the invention

[0005] A display device according to one embodiment of the present disclosure includes: a light-transmitting portion provided on a panel having electromagnetic wave transmittance; a display light source disposed inside the light-transmitting portion and configured to illuminate the light-transmitting portion by irradiating light to the light-transmitting portion; and a housing having an opening portion, accommodating the display light source and the light-transmitting portion being provided in the opening portion. The light-transmitting portion includes: a transparent resin substrate; a first color-forming layer containing a dye or a pigment; and a second color-forming layer containing a filler, the filler being composed of a cold mirror film that reflects visible light and transmits infrared light. The first color-forming layer has a transmittance of light of a specific wavelength of 20% or more, and the second color-forming layer has a reflectance of light of a wavelength not absorbed by the dye or the pigment of the first color-forming layer of 80% or less, and a transmittance of light of a wavelength absorbed by the dye or the pigment of the first color-forming layer of 60% or more. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic cross-sectional view showing an exterior structure of a vehicle according to an embodiment.

[0007] Figure 2 yes Figure 1 An enlarged view of a main portion of an exterior structure of a vehicle shown.

[0008] Figure 3 yes Figure 1 The illustrated diagram is an enlarged view of a main part of a second color developing layer included in the vehicle exterior structure. DETAILED DESCRIPTION

[0009] Hereinafter, an embodiment in which the display device is embodied as a display device provided in a vehicle will be described with reference to the drawings.

[0010] <Structure of vehicle 11>

[0011] like Figure 1 As shown, the vehicle 11 includes a non-light-transmitting panel 12 and a display device 13. The vehicle 11 is an example of an object provided with the display device 13. The non-light-transmitting panel 12 is an example of a non-light-transmitting portion. The display device 13 includes: a light-transmitting panel 14 provided on a panel having electromagnetic wave permeability, a display light source 15, and a housing 16. The light-transmitting panel 14 is an example of a light-transmitting portion. As an example, the non-light-transmitting panel 12 constitutes an engine hood 17 located at the front of the vehicle 11. As an example, the display device 13 constitutes a light-emitting grille 18. As an example, the light-transmitting panel 14 constitutes the exterior of the light-emitting grille 18 located at the front of the vehicle 11.

[0012] In the following description, Figure 1 The left side in is defined as the front side, and Figure 1 The right side in the figure is defined as the rear side. In addition, directions represented by terms such as "front", "rear", "up", "down", "left", and "right" are defined based on the vehicle.

[0013] The light-transmitting panel 14 is arranged around the non-light-transmitting panel 12. As an example, the light-transmitting panel 14 is arranged adjacent to the lower side of the non-light-transmitting panel 12. The exterior color of the non-light-transmitting panel 12 and the exterior color of the light-transmitting panel 14 are the same series of colors. At the rear side of the display device 13 of the vehicle 11, an infrared sensor 19 and a millimeter wave sensor 20 are arranged in a vertical arrangement.

[0014] The infrared sensor 19 transmits infrared rays (near infrared rays) toward the front of the vehicle 11, and receives infrared rays reflected by objects outside the vehicle including the preceding vehicle and pedestrians. The infrared rays transmitted by the infrared sensor 19 have a wavelength of 900 nm, for example. The infrared sensor 19 identifies the above-mentioned objects based on the infrared rays transmitted and received, and detects the distance and relative speed between the vehicle 11 and the above-mentioned objects. The infrared sensor 19 has a feature that it can detect objects smaller than those that the millimeter wave sensor 20 can detect.

[0015] The millimeter wave sensor 20 transmits millimeter waves toward the front of the vehicle 11, and receives millimeter waves reflected by objects outside the vehicle, including the preceding vehicle and pedestrians. The millimeter wave sensor 20 identifies the above objects based on the millimeter waves transmitted and received, and detects the distance and relative speed between the vehicle 11 and the above objects. Millimeter waves refer to electromagnetic waves with a wavelength of 1mm to 10mm and a frequency of 30GHz to 300GHz. The millimeter wave sensor 20 has the following characteristics: it is resistant to bad weather such as rain, fog, and snow, and has a longer detectable distance than the infrared sensor 19.

[0016] <Non-light-transmitting panel 12>

[0017] like Figure 1 As shown, the non-light-transmitting panel 12 does not transmit light from the outside, such as sunlight. That is, the non-light-transmitting panel 12 reflects almost 100% of the light from the outside having wavelengths not absorbed by the non-light-transmitting panel 12.

[0018] <Light-transmitting panel 14>

[0019] like Figure 1 and Figure 2 As shown, the light-transmitting panel 14 reflects and transmits light from the outside, such as sunlight. That is, the light-transmitting panel 14 reflects a portion of the light of wavelengths not absorbed by the light-transmitting panel 14 in the light from the outside, and transmits the remaining portion. For example, the light-transmitting panel 14 reflects 80% of the light of wavelengths not absorbed by the light-transmitting panel 14 in the light from the outside, and transmits the remaining 20%. The light-transmitting panel 14 has electromagnetic wave transmittance. That is, the light-transmitting panel 14 has infrared transmittance and millimeter wave transmittance. As described above, the outer color of the non-light-transmitting panel 12 and the outer color of the light-transmitting panel 14 are colors of the same series, so the wavelength of light not absorbed by the non-light-transmitting panel 12 is almost the same as the wavelength of light not absorbed by the light-transmitting panel 14.

[0020] The light-transmitting panel 14 has a plate-shaped transparent resin substrate 21 and a decorative layer 22 laminated on the rear surface of the transparent resin substrate 21. The decorative layer 22 has a first color-forming layer 23 laminated on the rear surface of the transparent resin substrate 21 and a second color-forming layer 24 laminated on the rear surface of the first color-forming layer 23. The transparent resin substrate 21 is composed of, for example, a polycarbonate (PC) resin, etc. The first color-forming layer 23 is a layer obtained by adding a dye or a pigment to a first base resin 25.

[0021] The first coloring layer 23 preferably has a transmittance of 20% or more for light of a specific wavelength. The light of a specific wavelength is, for example, light of the same wavelength as the color of the exterior color of the non-light-transmitting panel 12. In the case where the transmittance of the light of a specific wavelength at the first coloring layer 23 is less than 20%, when the light-transmitting panel 14 is illuminated for display by the display light source 15, the component of the exterior color of the non-light-transmitting panel 12 may be insufficient. In addition, the first coloring layer 23 preferably has a transmittance of 20% for light of a wavelength absorbed by its dye or pigment. Furthermore, the first coloring layer 23 preferably has a transmittance of 100% for light of a wavelength not absorbed by its dye or pigment. Sometimes, the wavelength absorbed by the dye or pigment of the first coloring layer 23 is referred to as the first absorption wavelength, and the wavelength not absorbed by the dye or pigment of the first coloring layer 23 is referred to as the first non-absorption wavelength.

[0022] like Figure 2 and Figure 3 As shown in FIG. 1 , the second color developing layer 24 is a layer obtained by making the second base resin 26 contain a filler 27 composed of a cold mirror film. The cold mirror film has the characteristics of reflecting visible light and transmitting infrared light. The second color developing layer 24 preferably has a reflectivity of 80% or less for the light of the first non-absorption wavelength. When the reflectivity of the light of the first non-absorption wavelength at the second color developing layer 24 is 100%, the light of the first non-absorption wavelength in the light irradiated from the display light source 15 is not transmitted at all.

[0023] The second coloring layer 24 preferably has a transmittance of 60% or more for the light of the first absorption wavelength. If the transmittance of the light of the first absorption wavelength in the second coloring layer 24 is less than 60%, the amount of light of the first absorption wavelength that is reflected by the housing 16 and then transmitted through the light-transmitting panel 14 and emitted to the outside may be insufficient.

[0024] like Figure 1 and Figure 2 As shown, the light-transmitting panel 14 preferably has a transmittance of 60% or more for infrared light with a wavelength of 900 nm, for example. If the transmittance of infrared light of the light-transmitting panel 14 is less than 60%, the detection accuracy of the infrared sensor 19 may be insufficient. The light-transmitting panel 14 preferably has an attenuation rate of 3.0 dB or less during the round trip of the millimeter wave. If the attenuation rate of the millimeter wave of the light-transmitting panel 14 exceeds 3.0 dB during the round trip of the millimeter wave, the detection accuracy of the millimeter wave sensor 20 may be insufficient.

[0025] <Casing 16>

[0026] like Figure 1 As shown, the housing 16 is in a rectangular box shape having an opening 28 at the front end. The opening 28 of the housing 16 is blocked by the transparent resin substrate 21 of the light-transmitting panel 14. The housing 16 has a facing surface 29 facing the light-transmitting panel 14. The decorative layer 22 of the light-transmitting panel 14 is located inside the housing 16.

[0027] The housing 16 is made of, for example, polycarbonate (PC) resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, acrylonitrile / ethylene-propylene-diene / styrene (AES) resin, acrylonitrile-styrene-acrylate copolymer (ASA) resin, or the like.

[0028] The upper end and the lower end of the facing surface 29 facing the light-transmitting panel 14 in the housing 16 are provided with a display light source 15. That is, the housing 16 accommodates two display light sources 15 inside. Therefore, each display light source 15 is arranged at a position on the rear side (inner side) of the light-transmitting panel 14. A reflecting portion 30 for easily reflecting light is provided on the facing surface 29. That is, the facing surface 29 is covered by the reflecting portion 30. The reflecting portion 30 is composed of, for example, a white reflecting material, a reflector, or the like.

[0029] The display light source 15 includes an LED (Light Emitting Diode) that emits visible light and a control circuit that controls the LED. The display light source 15 emits visible light toward the light-transmitting panel 14 to emit characters, patterns, etc. using the visible light that passes through the light-transmitting panel 14 .

[0030] <Effects of implementation methods>

[0031] On the one hand, the vehicle 11 usually emits light from the display light source 15 while driving at night. In this way, light is irradiated from the display light source 15 toward the light-transmitting panel 14, so that characters, patterns, etc. are displayed by light transmitted through the light-transmitting panel 14. At this time, the transmittance of light of a specific wavelength in the first color-emitting layer 23 is 20% or more, so the light that displays the above-mentioned characters and patterns also includes light of a specific wavelength.

[0032] Furthermore, when the reflectivity of the light of the first non-absorption wavelength at the second color-emitting layer 24 is, for example, 80%, the second color-emitting layer 24 allows the light of the first non-absorption wavelength to be transmitted to a certain extent in the light irradiated from the display light source 15. Therefore, the light for displaying the above-mentioned characters and patterns also includes the light of the first non-absorption wavelength. Therefore, the characters, patterns, etc. are well illuminated and displayed by the light passing through the light-transmitting panel 14.

[0033] On the other hand, the vehicle 11 usually does not make the light-transmitting panel 14 illuminate to display text, patterns, etc. during daytime driving, and therefore does not make the display light source 15 illuminate. In this way, the light-transmitting panel 14 reflects a portion of the light of wavelengths not absorbed by the light-transmitting panel 14 in the irradiated light from the outside (sunlight as an example), but allows the rest to pass. At this time, the non-transparent panel 12 adjacent to the light-transmitting panel 14 reflects almost all of the light of wavelengths not absorbed by the non-transparent panel 12 in the irradiated sunlight. Therefore, the reflectivity of the sunlight at the light-transmitting panel 14 is lower than the reflectivity of the sunlight at the non-transparent panel 12.

[0034] Therefore, the amount of sunlight reflected by the light-transmitting panel 14 is less than the amount of sunlight reflected by the non-light-transmitting panel 12. That is, there is a difference between the amount of sunlight reflected by the light-transmitting panel 14 and the amount of sunlight reflected by the non-light-transmitting panel 12. If this difference becomes large, even if the exterior color of the light-transmitting panel 14 and the exterior color of the non-light-transmitting panel 12 are of the same series of colors, the color development between the light-transmitting panel 14 and the non-light-transmitting panel 12 is significantly different. As a result, the boundary between the light-transmitting panel 14 and the non-light-transmitting panel 12 is likely to become prominent, thereby causing the appearance of the vehicle 11 to deteriorate.

[0035] At this point, if Figure 2 As shown, in this embodiment, when the vehicle 11 is running during the day, even if the display light source 15 is not lit, light is emitted from the light-transmitting panel 14 to the outside as follows. That is, when sunlight as light from the outside is irradiated to the light-transmitting panel 14, the sunlight passes through the transparent resin substrate 21 and the first coloring layer 23 and reaches the second coloring layer 24. At this time, 100% of the sunlight passes through the transparent resin substrate 21. On this basis, 20% of the light of the first absorption wavelength of the sunlight that has passed through the transparent resin substrate 21 passes through the first coloring layer 23, and 100% of the light of the first non-absorption wavelength passes through the first coloring layer 23.

[0036] For example, if 80% of the light of the first non-absorption wavelength in the sunlight reaching the second coloring layer 24 is reflected by the second coloring layer 24, 20% is transmitted through the second coloring layer 24. More than 60% of the light of the first absorption wavelength in the sunlight reaching the second coloring layer 24 is transmitted through the second coloring layer 24. After the sunlight that has passed through the second coloring layer 24 is reflected by the reflecting portion 30, a part of it is transmitted through the light-transmitting panel 14 and emitted to the outside in the same manner as described above. Therefore, the amount of light emitted from the light-transmitting panel 14 to the outside is increased.

[0037] Thus, the light-transmitting panel 14 develops color in a state where its outer color is close to the outer color of the non-light-transmitting panel 12. This is because the smaller the difference between the amount of light emitted to the outside from the light-transmitting panel 14 and the amount of light emitted to the outside from the non-light-transmitting panel 12, the closer the appearance of the outer color of the non-light-transmitting panel 12 and the outer color of the light-transmitting panel 14 are. As a result, the appearance of the light-transmitting panel 14 is close to the appearance of the non-light-transmitting panel 12, so the boundary between the light-transmitting panel 14 and the non-light-transmitting panel 12 is not easy to become noticeable. Therefore, the appearance of the vehicle 11 is improved.

[0038] As an example, Figure 2 As shown by the arrows, it is assumed that the amount of incident sunlight 31 incident on each of the light-transmitting panel 14 and the non-light-transmitting panel 12 is set to "100". In this case, the light-transmitting panel 14 reflects "80" of the incident sunlight 31 as reflected light 32 and transmits the remaining "20" of the incident sunlight 31 as transmitted light 33. On the other hand, the non-light-transmitting panel 12 reflects "100" of the incident sunlight 31 as reflected light 32. In this state, the amount of light emitted to the outside from the light-transmitting panel 14 is "80", and the amount of light emitted to the outside from the non-light-transmitting panel 12 is "100".

[0039] However, after the transmitted light 33 of "20" that has passed through the light-transmitting panel 14 is reflected by the reflecting portion 30 of the housing 16, a portion of "20" (set as "A") is emitted to the outside from the inside of the light-transmitting panel 14 through the light-transmitting panel 14 as the inner reflected light 34. In this way, the amount of light emitted to the outside from the light-transmitting panel 14 becomes "80+A", and therefore, the difference between the amount of light emitted to the outside from the light-transmitting panel 14 and the amount of light emitted to the outside from the non-light-transmitting panel 12 becomes smaller by the amount of "A" mentioned above. Therefore, the exterior color of the light-transmitting panel 14 is close to the exterior color of the non-light-transmitting panel 12. Therefore, the boundary between the light-transmitting panel 14 and the non-light-transmitting panel 12 is not easy to become noticeable, and thus, the appearance of the vehicle 11 is improved.

[0040] In addition, since the transmittance of infrared light with a wavelength of 900 nm is 60% or more, the detection accuracy of the infrared sensor 19 is ensured. Furthermore, since the attenuation rate of the millimeter wave in the round trip process is 3.0 dB or less, the detection accuracy of the millimeter wave sensor 20 is ensured. Therefore, the light-transmitting panel 14 also functions as an electromagnetic wave transmission cover.

[0041] <Effects of implementation>

[0042] According to the above-described detailed embodiments, the following effects are achieved.

[0043] (1) The display device 13 includes: a light-transmitting panel 14 having electromagnetic wave transmittance; a display light source 15 disposed inside the light-transmitting panel 14; and a housing 16 having an opening 28. The light-transmitting panel 14 includes: a transparent resin substrate 21, a first color-developing layer 23 containing a dye or a pigment, and a second color-developing layer 24 containing a filler 27, wherein the filler 27 is composed of a cold mirror film that reflects visible light and transmits infrared light. The display light source 15 irradiates light to the light-transmitting panel 14, thereby causing the light-transmitting panel 14 to emit light for display. The housing 16 accommodates the display light source 15 and sets the light-transmitting panel 14 in the opening 28. The first color-developing layer 23 has a transmittance of 20% or more for light of a specific wavelength. The second color-forming layer 24 has a reflectivity of 80% or less for light of a wavelength not absorbed by the dye or pigment of the first color-forming layer 23 (first non-absorption wavelength), and a transmittance of 60% or more for light of a wavelength absorbed by the dye or pigment of the first color-forming layer 23 (first absorption wavelength).

[0044] According to the above structure, at night, light is irradiated from the display light source 15 to the light-transmitting panel 14, and the light passes through the light-transmitting panel 14 and enters the outside, so that the light-transmitting panel 14 can be made to emit light for display. On the other hand, during the day, even if light is not emitted from the display light source 15, the first color-emitting layer 23 and the second color-emitting layer 24 allow light from the outside to be appropriately transmitted, and the transmitted light is reflected by the housing 16 and emitted from the light-transmitting panel 14 to the outside. Therefore, the amount of light emitted from the light-transmitting panel 14 to the outside can be increased. Therefore, the amount of light emitted from the light-transmitting panel 14 to the outside can be made close to the amount of light emitted from the non-light-transmitting panel 12 arranged adjacent to the light-transmitting panel 14 to the outside. As a result, the outer color of the light-transmitting panel 14 can be made close to the outer color of the non-light-transmitting panel 12, so that the boundary between the light-transmitting panel 14 and the non-light-transmitting panel 12 is not easy to become noticeable. Therefore, the appearance of the vehicle 11 provided with the display device 13 can be improved.

[0045] (2) In the display device 13 , the reflecting portion 30 for easily reflecting light is provided on the facing surface 29 of the housing 16 that faces the light-transmitting panel 14 .

[0046] According to the above configuration, the light entering the housing 16 from the outside through the first color developing layer 23 and the second color developing layer 24 can be efficiently reflected toward the light transmitting panel 14 by the reflecting portion 30. Therefore, the amount of light emitted from the housing 16 through the light transmitting panel 14 to the outside can be further increased.

[0047] (3) In the display device 13, the infrared transmittance of the light-transmitting panel 14 is 60% or more, and the attenuation rate of the millimeter wave is 3.0 dB or less.

[0048] According to the above configuration, when electromagnetic wave sensors such as infrared sensor 19 and millimeter wave sensor 20 are arranged inside light-transmitting panel 14 , light-transmitting panel 14 can function as an electromagnetic wave transmitting cover for covering infrared sensor 19 , millimeter wave sensor 20 and the like.

[0049] <Change Example>

[0050] The above-mentioned embodiment can be implemented with modifications as follows. In addition, the above-mentioned embodiment and the following modifications can be implemented in combination with each other within the range that there is no technical contradiction.

[0051] The reflecting portion 30 may be omitted.

[0052] In the light-transmitting panel 14 , the decorative layer 22 may be laminated on the front surface of the transparent resin base material 21 .

[0053] The light-transmitting panel 14 does not necessarily have to have an infrared transmittance of 60% or more.

[0054] The light-transmitting panel 14 does not necessarily have to set the attenuation rate of the millimeter wave to 3.0 dB or less.

[0055] The light from outside is not limited to sunlight, and may be, for example, light from a lighting device installed outdoors or indoors.

[0056] The decorative layer 22 may include at least one of a smoke layer for controlling reflected light and a complementary color layer for controlling luminescent color.

[0057] The display device 13 may have a light-transmitting portion and a light-non-transmitting portion provided adjacent to each other on a panel constituting the design surface thereof.

[0058] The display device 13 may be installed on an object other than the vehicle 11. Examples of the object include a food delivery robot, a drone, and an outer wall or inner wall of a building.

Claims

1. A display device comprising: A light-transmitting portion, which is provided on a panel having electromagnetic wave transmittance; a display light source disposed inside the light-transmitting portion and configured to illuminate the light-transmitting portion to cause the light-transmitting portion to emit light for display; and The housing has an opening and contains the display light source, and the light-transmitting portion is disposed in the opening. The light-transmitting portion has: Transparent resin substrate; a first chromogenic layer containing a dye or a pigment; and The second color-forming layer contains a filler, wherein the filler is composed of a cold light mirror film that reflects visible light and transmits infrared light. The first color-emitting layer has a transmittance of light of a specific wavelength of 20% or more. The second color developing layer has a reflectivity of 80% or less for light of a wavelength not absorbed by the dye or pigment of the first color developing layer and a transmittance of 60% or more for light of a wavelength absorbed by the dye or pigment of the first color developing layer.

2. The display device according to claim 1, characterized in that A reflecting portion configured to easily reflect light is provided on a surface of the housing facing the light transmitting portion.

3. The display device according to claim 1 or 2, characterized in that: The light-transmitting portion has an infrared transmittance of 60% or more and a millimeter wave attenuation of 3.0 dB or less.

Images