JP7164380B2 - Display device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a display surface composed of a plate-like translucent portion.

2. Description of the Related Art Conventionally, there have been proposed display devices in which various gauges are covered with translucent members (for example, glass plates and translucent resin plates). For example, in one of the conventional display devices, a plate-like protective cover made of translucent resin such as acrylic covers a needle and a dial for displaying the engine speed of a vehicle. (See, for example, Patent Document 1.).

JP 2016-045251 A

When the above-described display device is installed on the instrument panel of a vehicle, the display device is generally covered with a hood or the like for blocking external light from the viewpoint of improving the visibility of instruments. there is On the other hand, for the purpose of improving the operability of the display device and increasing the degree of freedom in designing the display device, for example, it is conceivable to expose the display device above the instrument panel without providing a hood or the like. However, if the display device is exposed carelessly, there is a possibility that the external light incident on the translucent member may be reflected by the peripheral edge surface of the translucent member and emitted to the user side. Reflection of external light on such a peripheral edge face may adversely affect driving because the reflected light enters the driver's eyes. In addition, there is a possibility that the appearance of the display device will be spoiled. For this reason, it is desirable to suppress the reflection of external light on the peripheral edge face of the translucent member as much as possible. Of course, it is desirable to suppress such reflection of external light as much as possible even when the display device is used for purposes other than installation in a vehicle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device capable of suppressing unintended reflection of external light by the peripheral end face of a translucent member.

In order to achieve the above object, a display device according to the present invention is characterized by the following [1] to [ 2 ].
[1]
a plate-shaped light-transmitting portion constituting a display surface;
a resin portion provided so as to be in close contact with at least a portion of a peripheral end surface of the light transmitting portion;
a colored portion that receives light that passes through the peripheral edge face and reaches the resin portion;
a display object visually recognized through the display surface;
a housing in which the translucent part and the display target are mounted ;
A part of the housing covers at least a part of the peripheral edge of the translucent part, an inner side surface of the peripheral edge and an end surface of the peripheral edge, and the outer side of the peripheral edge is exposed to the outside. with a recess for receiving in the
A transparent resin serving as the resin portion is filled between an end surface of the peripheral edge portion of the light transmitting portion and a bottom surface of the hollow portion serving as the colored portion,
The transparent resin has the same color as the housing,
Must be a display device.
[2]
a plate-shaped light-transmitting portion constituting a display surface;
a resin portion provided so as to be in close contact with at least a portion of a peripheral end surface of the light transmitting portion;
a colored portion that receives light that passes through the peripheral edge face and reaches the resin portion;
a display object visually recognized through the display surface;
a housing in which the translucent part and the display target are mounted;
A part of the housing covers at least a part of the peripheral edge of the translucent part, an inner side surface of the peripheral edge and an end surface of the peripheral edge, and the outer side of the peripheral edge is exposed to the outside. with a recess for receiving in the
A colored resin serving as a common member serving as both the resin portion and the colored portion is filled between the end surface of the peripheral portion of the translucent portion and the bottom surface of the recessed portion,
The colored resin has the same color as the housing,
Must be a display device.

According to the display device having the above configurations [1] and [2] , the resin portion is in close contact with at least a part of the peripheral end surface of the translucent portion (for example, a glass plate and a translucent resin plate). Here, generally, the absolute refractive index of the resin portion (generally greater than 1) is greater than the absolute refractive index of air (≈1). In other words, the absolute refractive index of the resin portion is usually closer to the absolute refractive index of the translucent portion (generally greater than 1) than the absolute refractive index of air. Therefore, with respect to light incident on the peripheral end surface from the inside of the light transmitting portion toward the outside, the relative refractive index of the resin portion with respect to the light transmitting portion is larger than the relative refractive index of air with respect to the light transmitting portion (that is, close to 1). The absolute refractive index is defined as the refractive index of a medium with respect to vacuum, and the relative refractive index is defined as the refractive index of one medium with respect to another medium.

Considering the above-mentioned relative refractive index, the inside of the light-transmitting portion is more stable when the resin portion is in close contact with the peripheral edge face of the light-transmitting portion than when the peripheral edge face of the light-transmitting portion is exposed to the air. The critical angle of the light incident on the peripheral edge face toward the outside is large. In other words, the percentage of the light totally reflected by the peripheral end face is small in the light that can enter the peripheral end face from any direction toward the outside from the inside of the translucent portion. Therefore, by bringing the resin portion into close contact with the peripheral end face of the translucent portion, the transmittance of light incident on the peripheral end face is enhanced.

Light transmitted through the peripheral edge face is received by the colored portion. For example, if the colored portion is black, the light transmitted through the peripheral end surface is substantially absorbed by the colored portion, making it difficult for the user to visually recognize the reflected light from the peripheral end surface. Further, if the colored portion is set to an arbitrary color such as brown or gray, or a metal color such as gold or silver, the color of the reflected light on the peripheral end face can be arbitrarily adjusted.

Therefore, according to the display device having this configuration, it is possible to suppress unintended reflection of external light by the peripheral edge surface of the translucent member. Furthermore, it is possible not only to simply suppress the reflection of external light by the peripheral end face, but also to adjust the color of the reflected light by the peripheral end face as needed.

It should be noted that the fact that the resin portion is in close contact with the peripheral edge surface of the light-transmitting portion means that there is absolutely no other medium (for example, minute air bubbles that may occur during manufacturing) between the peripheral edge surface and the resin portion. do not do. As long as the reflected light from the peripheral edge surface is less visible to the user than when the peripheral edge surface is exposed to the air, it can be considered to be substantially "adhered" even if another medium intervenes.

The display device having the configuration [ 1 ] has a separate structure in which the resin portion and the colored portion belong to different members. As an example, the display device is configured such that an adhesive tape having a resin-made adhesive (that is, the resin portion) provided on a colored sheet-like member (that is, the colored portion) is attached to the peripheral end surface of the translucent portion. can be considered. As another example, a translucent resin (resin portion) is filled between the peripheral edge face of the translucent portion and the peripheral member (colored portion; In addition, it is conceivable to construct a display device.

The display device having the configuration [ 2 ] has an integrated structure in which a common member serving as both the resin portion and the colored portion is provided. As an example, it is conceivable to configure the display device so that a colored resin member (common member) is brought into close contact with the peripheral edge surface of the translucent portion. As another example, it is conceivable to configure the display device so that a colored resin paint (common member) is applied to the peripheral end face of the translucent portion.

In the display device having the configuration of [ 1 ] above, a colored member (for example, a dial and a housing of an instrument) that is arranged around the peripheral end face constitutes a colored portion, and a portion between the peripheral end face and the colored portion The resin portion is composed of translucent resin that fills the . As a result, unintended reflection of external light by the peripheral edge face of the translucent member can be suppressed.

In the display device having the configuration [ 2 ], the common member serving as both the resin portion and the colored portion is made of colored resin. As a result, unintended reflection of external light by the peripheral edge face of the translucent member can be suppressed.

According to the present invention, it is possible to provide a display device capable of suppressing unintended reflection of external light by the peripheral end face of a translucent member.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following detailed description of the invention (hereinafter referred to as "embodiment") with reference to the accompanying drawings. .

FIG. 1 is a schematic diagram showing an example of an instrument panel of a vehicle equipped with a display device according to a first embodiment of the invention. FIG. 2(a) is a cross-sectional view taken along the line AA in FIG. 1, FIG. 2(b) is an enlarged view of part B in FIG. 2(a), and FIG. ) is an enlarged view of the C part. FIGS. 3(a) and 3(b) are diagrams corresponding to FIGS. 2(b) and 2(c) in the second embodiment of the present invention. FIGS. 4(a) and 4(b) are diagrams corresponding to FIGS. 2(b) and 2(c) in the third embodiment of the present invention. FIG. 5(a) is a diagram corresponding to FIG. 2(b) in the modification of the second embodiment of the present invention, and FIG. 5(b) is a diagram of FIG. 2 in the modification of the third embodiment of the present invention. It is a figure corresponding to (b).

<First embodiment>
A display device according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an instrument panel (dashboard) 2 of a vehicle equipped with display devices 1a to 1d according to an embodiment of the present invention.

In the example shown in FIG. 1, the display device 1a according to the first embodiment of the present invention is provided on the instrument panel 2 on the front side of the steering wheel 3 of the vehicle. The display device 1b is provided on the upper side of the central portion of the instrument panel 2 in the width direction of the vehicle. The display device 1c is provided at a lower position in the central portion of the instrument panel 2 in the width direction of the vehicle. The display device 1d is provided so as to protrude upward from the upper surface of the instrument panel 2 at the center in the vehicle width direction. None of the display devices 1a to 1d is covered with a hood or the like for blocking external light, and is exposed on the surface of the instrument panel 2. FIG. As a representative example, the structure of the display device 1a will be described in detail below. The other display devices 1b to 1d also have the same structure as the display device 1a.

As shown in FIG. 2A, the display device 1a is a meter housing mounted with a dial 4 such as a meter and a translucent section 10, which is attached to the inner wall surface of a recess 2a provided in an instrument panel 2. A body 5 is provided.

The translucent part 10 is a glass plate or translucent resin plate having a curved surface shape, and constitutes a display surface for the user of the vehicle or the like to visually recognize the dial 4 . A peripheral portion of the translucent portion 10 is fixed to the meter housing 5 over its entire circumference. As a representative example, the structure of the portion corresponding to the portion B in FIG. 2A will be described in detail below. Other parts of the peripheral portion of the translucent portion 10 also have the same structure.

As shown in FIGS. 2(b) and 2(c), the peripheral edge of the translucent part 10 is inserted into a recess 6a provided at the upper end of the dial 6 which is part of the meter housing 5. It is fixed and covered by a bezel 7 that is part of the meter housing 5 . A cavity 8 exists between the peripheral end surface 11 of the translucent portion 10 and the dial 6 (the inner surface of the recessed portion 6a).

An adhesive tape 20 is attached to the peripheral end surface 11 of the translucent portion 10 . The adhesive tape 20 is composed of a colored sheet-like member 21 functioning as a "colored portion" and a resin-made adhesive 22 functioning as a "resin portion" provided on one surface of the sheet-like member 21. ing. With this configuration, the adhesive 22 (resin portion) that adheres to the peripheral edge surface 11 is interposed between the peripheral edge surface 11 and the sheet-like member 21 (colored portion). The adhesive tape 20 can be attached to the peripheral edge surface 11 while pressing the adhesive tape 20 against the peripheral edge surface 11 with an operator's finger, a roller, or the like so that air or the like does not intervene between the adhesive tape 20 and the peripheral edge surface 11. - 特許庁preferable. The adhesive tape 20 is preferably attached over the entire periphery of the peripheral edge surface 11 of the translucent portion 10 . However, the adhesive tape 20 may be attached only to a part of the peripheral end surface 11 of the translucent portion 10 in the circumferential direction. It should be noted that "colored" is a concept that includes not only colors such as black and brown, but also metal colors such as gold and silver.

Part of the light that has entered the light-transmitting portion 10 from the outside can enter the peripheral edge face 11 from the inside of the light-transmitting portion 10 toward the outside from any direction. As shown in FIG. 2C, part of the light incident on the peripheral edge surface 11 passes through the peripheral edge surface 11, passes through the adhesive 22 (resin portion), and is received by the sheet member 21 (colored portion). It will be.

<Action/effect>
The action and effect of attaching the adhesive tape 20 to the peripheral end surface 11 of the translucent portion 10 in this way will be described below.

First, the concept of refraction and reflection of light at the interface between one medium and another medium will be briefly described. The index of refraction when light travels from a vacuum through an interface into a medium is called the absolute index of refraction of that medium. The absolute refractive index depends on the wavelength of light. Generally, the absolute refractive index means a value for light with a wavelength of 589.3 nm. The index of refraction when light travels from one medium through an interface to another medium is called the relative index of refraction of the medium with respect to the other medium. The relative refractive index is obtained by dividing the absolute refractive index of the latter (another medium) by the absolute refractive index of the former (one medium). Therefore, the closer the relative refractive index of another medium to one medium is to 1, the smaller the difference between the absolute refractive index of the one medium and the absolute refractive index of the other medium. In the case where the relative refractive index is less than 1, when the incident angle of light on the boundary surface is equal to or greater than the critical angle, the light is totally reflected and does not pass through the boundary surface. The larger the relative refractive index, the larger the critical angle, so the proportion of light that is totally reflected at the boundary surface among the light that can enter the boundary surface from any direction becomes smaller. Conversely, the greater the relative refractive index, the greater the proportion of light that passes through the interface.

Based on the above concept, the action and effect of sticking the adhesive tape 20 to the peripheral end face 11 of the translucent portion 10 will be described. In general, the absolute refractive index (generally greater than 1) of the pressure-sensitive adhesive 22 (resin portion) made of resin is greater than the absolute refractive index (approximately) of air. In other words, the absolute refractive index of the resin portion 22 is usually closer to the absolute refractive index of the translucent portion 10 (generally greater than 1) than the absolute refractive index of air. For example, the absolute refractive index of glass is about 1.43-2.14, the absolute refractive index of polycarbonate (PC) is about 1.59, and the absolute refractive index of acrylic resin (PMMA) is about 1.49-2.14. 1.53.

Therefore, with respect to light incident on the peripheral end surface 11 from the inside of the light transmitting portion 10 toward the outside, the relative refractive index of the adhesive 22 (resin portion) with respect to the light transmitting portion 10 is higher than the relative refractive index of air with respect to the light transmitting portion 10 . The ratio will be larger (ie closer to 1). Therefore, compared to the case where the peripheral edge surface 11 is exposed to the air without the adhesive tape 20 being attached to the peripheral edge surface 11 of the translucent portion 10, the adhesive 22 (the resin portion) is applied to the peripheral edge surface 11 as in the present embodiment. ) are in close contact with each other, the critical angle is larger. In other words, the proportion of the light that is totally reflected by the peripheral edge surface 11 out of the light that can be incident on the peripheral edge surface 11 from the inside of the translucent portion 10 toward the outside from any direction is reduced. As a result, by adhering the adhesive 22 (resin portion) to the peripheral edge surface 11 of the translucent portion 10, the transmittance of light incident on the peripheral edge surface 11 can be enhanced.

The light transmitted through the peripheral edge face 11 is received by the colored sheet member 21 (colored portion). For example, if the sheet-like member 21 (colored portion) is black, the light transmitted through the peripheral edge surface 11 is substantially absorbed by the sheet-like member 21 (colored portion), so the reflection on the peripheral edge surface 11 is visible. it gets harder. In addition, if the sheet-like member 21 (colored portion) is given an arbitrary color such as brown or gray, or a metallic color such as gold or silver, the color of the reflected light on the peripheral end surface 11 can be arbitrarily adjusted. .

Therefore, according to the display devices 1a to 1d, unintended reflection of external light by the peripheral edge face 11 of the translucent portion 10 can be suppressed. Furthermore, it is possible not only to suppress the reflection of external light by the peripheral end surface 11 but also to adjust the color of the reflected light by the peripheral end surface 11 as necessary.

<Second embodiment>
In the first embodiment, an adhesive tape 20 in which a resin-made adhesive 22 (resin portion) is provided on a colored sheet member 21 (colored portion) is attached to the peripheral edge surface 11 of the translucent portion 10. .

On the other hand, as shown in FIG. 3, between the peripheral edge surface 11 of the translucent portion 10 and the facing 6 (bottom surface of the recessed portion 6a) that holds the peripheral edge surface 11 as the “colored portion”, the “resin portion ” may be filled with a transparent resin 30 (resin portion). The resin 30 fills the space between the recessed portion 6 a and the peripheral end surface 11 . As a result, the resin 30 (resin portion) and the dial 6 (colored portion) are arranged so that the light transmitted through the peripheral edge face 11 passes through the resin 30 and is received by the dial 6 . Therefore, the same actions and effects as those of the first embodiment can be obtained.

The transparent resin 30 is preferably provided over the entire circumference of the peripheral end face 11 of the light transmitting portion 10, but may be provided only on a part of the peripheral end face 11 of the light transmitting portion 10 in the circumferential direction.

<Third Embodiment>
In the first embodiment and the second embodiment, the adhesive 22 (resin portion) and the sheet-like member 21 (colored portion) have separate structures belonging to different members.

On the other hand, as shown in FIG. 4, between the peripheral edge surface 11 of the translucent portion 10 and the dial 6 (bottom surface of the recessed portion 6a) that holds the peripheral edge surface 11, a common A colored resin 40 may be filled so as to fill the space therebetween as a "member". Thereby, the resin 40 receives the light transmitted through the peripheral end surface 11 . Therefore, the same actions and effects as those of the first embodiment and the second embodiment can be obtained.

The colored resin 40 is preferably provided over the entire circumference of the peripheral end face 11 of the light transmitting portion 10, but may be provided only on a part of the peripheral end face 11 of the light transmitting portion 10 in the circumferential direction.

<Other forms>
The present invention is not limited to the above embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.

For example, in the aspects shown in the second and third embodiments (see FIGS. 3 and 4), the peripheral edge portion of the translucent portion 10 inserted and fixed in the recess portion 6a provided at the upper end portion of the dial plate 6 is covered by the bezel 7. On the other hand, as shown in FIG. 5, the peripheral edge of the translucent part 10 inserted and fixed in the recess 6a provided at the upper end of the label 6 does not have to be covered with the bezel 7. In this case, particularly, by forming the resin 30 and the resin 40 from a resin material having the same or similar color as the color of the end cover 6, the design of the display device can be improved while suppressing reflection of external light by the peripheral end surface 11. can improve.

Further, for example, in the third embodiment, a colored resin 40 is filled between the peripheral edge surface 11 and the dial plate 6 so as to be in close contact with the peripheral edge surface 11 of the translucent portion 10 . On the other hand, a resinous film may be formed on the peripheral edge surface 11 by applying or melt-spraying a colored resin paint onto the peripheral edge surface 11 .

Furthermore, in the first to third embodiments, the display devices 1a to 1d are provided on the instrument panel 2 of the vehicle. However, the display device according to the present invention may be used for purposes other than installation on a vehicle.

Here, the features of the embodiments of the display devices 1a to 1d according to the present invention described above are briefly summarized in [1] to [6] below.
[1]
a plate-shaped translucent part (10) forming a display surface;
a resin portion (22, 30, 40) provided so as to be in close contact with at least a part of the peripheral end face (11) of the light transmitting portion (10);
colored portions (21, 6, 40) that receive light passing through the peripheral end surface (11) and reaching the resin portions (22, 30, 40);
A display object (4) that is visually recognized through the display surface,
a display device (1a-1d);
[2]
In the display device (1a to 1d) according to [1] above,
The resin parts (22, 30) and the colored parts (21, 6) have separate structures belonging to different members,
The resin portion and the colored portion are arranged such that the light transmitted through the peripheral end face (11) passes through the resin portion (22, 30) and is received by the colored portion (21, 6),
a display device (1a-1d);
[3]
In the display device (1a to 1d) according to [1] above,
having an integral structure provided with a common member (40) that serves as both the resin portion and the colored portion;
The common member (40) is provided so as to be in close contact with at least a part of the peripheral end face (11) of the light transmitting portion (10),
a display device (1a-1d);
[4]
In the display device (1a to 1d) according to [2] above,
The colored portion is a colored sheet member (21),
The resin part is an adhesive (22) provided on one surface of the colored part (21),
The resin portion and the colored portion constitute an adhesive tape (20),
a display device (1a-1d);
[5]
In the display device (1a to 1d) according to [2] above,
The colored portion is a colored member (6) arranged around at least a part of the peripheral end face (11),
The resin portion is a member (30) made of translucent resin arranged so as to fill the space between the peripheral end surface (11) and the colored portion (6).
a display device (1a-1d);
[6]
In the display device (1a to 1d) according to [3] above,
The common member (40) serving as both the resin portion and the colored portion is a member made of a colored resin,
a display device (1a-1d);

1a to 1d display device 6 endpaper (colored part, colored member)
REFERENCE SIGNS LIST 10 Translucent portion 11 Peripheral edge surface 20 Adhesive tape 21 Sheet member (colored portion)
22 Adhesive (resin part)
30 resin (resin part)
40 resin (resin part, colored part, common member)

Claims (2)

a plate-shaped light-transmitting portion constituting a display surface;
a resin portion provided so as to be in close contact with at least a portion of a peripheral end surface of the light transmitting portion;
a colored portion that receives light that passes through the peripheral edge face and reaches the resin portion;
a display object visually recognized through the display surface;
a housing in which the translucent part and the display target are mounted ;
A part of the housing covers at least a part of the peripheral edge of the translucent part, an inner side surface of the peripheral edge and an end surface of the peripheral edge, and the outer side of the peripheral edge is exposed to the outside. with a recess for receiving in the
A transparent resin serving as the resin portion is filled between an end surface of the peripheral edge portion of the light transmitting portion and a bottom surface of the hollow portion serving as the colored portion,
The transparent resin has the same color as the housing,
display device. a plate-shaped light-transmitting portion constituting a display surface;
a resin portion provided so as to be in close contact with at least a portion of a peripheral end surface of the light transmitting portion;
a colored portion that receives light that passes through the peripheral edge face and reaches the resin portion;
a display object visually recognized through the display surface;
a housing in which the translucent part and the display target are mounted;
A part of the housing covers at least a part of the peripheral edge of the translucent part, an inner side surface of the peripheral edge and an end surface of the peripheral edge, and the outer side of the peripheral edge is exposed to the outside. with a recess for receiving in the
A colored resin serving as a common member serving as both the resin portion and the colored portion is filled between the end surface of the peripheral portion of the translucent portion and the bottom surface of the recessed portion,
The colored resin has the same color as the housing,
display device.

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