JP6941277B2 - Display device - Google Patents

Description

The present invention relates to a display device for a vehicle.

Conventionally, various display devices in which a display device is arranged between two pointer-type instruments have been proposed, and are disclosed in, for example, Patent Document 1. Such a display device includes a cover plate having an instrument unit on which an index is indicated, a light transmitting unit that transmits light from the rear, a pointer that rotates on the instrument unit and points to the index, and a rear portion of the light transmitting unit. It is provided with a display device which is arranged in the above and displays an image through a light transmitting portion. When the display device is viewed in a plan view, the instrument unit has an overlapping area that overlaps a part of the display unit that emits light from the display unit, and is interposed between the cover plate and the display unit at least over the range of the light transmitting portion. The transparent resin to be filled suppresses a decrease in visibility due to diffused reflection of external light between the cover plate and the display.

Japanese Unexamined Patent Publication No. 2014-163755

However, in the display device described in Patent Document 1, the transparent resin between the cover plate and the display device is a cured liquid agent of an optical transparent adhesive or an adhesive sheet. There was a problem that it could not be made too thick. Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a display device having good visibility of the display device that can be visually recognized from the cover plate even when the gap between the cover plate and the display device is large. It is a thing.

The present invention is a display device C including a display 40 having a display unit 40a for displaying an image and a cover plate 10 covering the front side of the display 40, wherein the display 40 is the display. The cover plate 10 has a first low reflection processing layer 42 formed on the front surface side of the display 40a so as to cover the display 40a, and the cover plate 10 is a first light transmitting portion that transmits light of the display 40a. On the rear surface side of the cover plate 10 having a first opaque portion 13 formed on the front surface side of the cover plate 10 having 10b and a second light transmitting portion 15a larger than the first light transmitting portion 10b. The second opaque portion 15 to be formed, and the second low reflection processing layer 18 formed on the rear surface side of the second opaque portion 15 and the rear surface side of the cover plate 10 corresponding to the display portion 40a. An intermediate layer 16 is provided between the second opaque portion 15 and the second low reflection processing layer 18 .

Since the antireflection layer on the rear surface of the cover plate and the front surface of the display device suppresses diffused reflection of light, it is possible to provide a display device that suppresses a decrease in visibility due to diffused reflection of external light.

Front view showing an embodiment of the present invention Sectional view taken along the line AA of FIG. Enlarged view of part Z in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The display device C is composed of a cover plate 10, a pointer 20, a stepping motor 30, a liquid crystal display (display) 40, light emitting elements 50 and 51, a light guide member 60, a circuit board 70, a case body 80, and the like.

The cover plate 10 has an index unit 10a composed of a plurality of scales and numbers indicated by the pointer 20, and a rectangular first light transmitting unit 10b that transmits light from the display unit 40a of the liquid crystal display 40. , Supported on the front surface of the case body 80. The index unit 10a is arranged in an arc shape around the pointer 20 when viewed from the front, and has an overlapping region 10c in which a part thereof overlaps the display unit 40a.

As shown in FIG. 3, the cover plate 10 includes a base material 12, a ground color layer (first opaque portion) 13, a protective layer 14, a light-shielding layer (second opaque portion) 15, and a colored layer (intermediate layer). ) 16, the adhesive layer 17, and the second low reflection treatment layer 18. The cover plate 10 is formed with a circular hole 19 through which the pointer 20 is passed.

The base material 12 is a flat plate-shaped synthetic resin member having transparent or semi-transparent translucent properties (including semi-transparent properties). Specifically, the base material 12 is a polycarbonate resin (refractive index of light is about 1.6), an acrylic resin (refractive index of light is about 1.49), and a silicone resin (refractive index of light is about 1). It is formed by using .5) and the like.

The ground color layer 13 is obtained by printing a light-shielding black ink on the front surface of the base material 12. The index portion 10a, the first light transmitting portion 10b, and the overlapping region 10c are printed without black ink and formed on the ground color layer 13.

The protective layer 14 is printed with ink containing fine translucent particles so as to cover substantially the entire front surface of the base material 12. As a result, the protective layer 14 is coated with a film having an uneven pattern to protect the base material 12 and the ground color layer 13, and also has an AG (Anti Glare) effect of preventing image reflection by using a light scattering effect. Have.

The light-shielding layer 15 is obtained by printing a light-shielding black ink on the rear surface of the base material 12. In the light-shielding layer 15, the portion corresponding to the first light transmitting portion 10b of the ground color layer 13 is printed with a larger amount of black ink than the ground color layer 13, and is formed by the ground color layer 13 so as not to be visible from the front surface. It has a second light transmitting portion 15a. The portion corresponding to the index portion 10a and the overlapping region 10c of the ground color layer 13 is also printed with a larger amount of black ink than each of the ground color layers 13 and is formed by the ground color layer 13 so as not to be visible from the front surface. There is.

The colored layer 16 is formed by forming a semipermeable smoke ink on the rear surface of the base material 12 so as to cover the second light transmitting portion 15a, and is printed so that the outer periphery thereof overlaps with the light shielding layer 15. Is.

The second low-reflection treated layer 18 is a sheet material having a larger area than the colored layer 16 and having a moth-eye structure on one side. The moth-eye structure is formed by arranging uneven patterns at intervals of visible light wavelength or less (for example, 400 nm or less), which are finer than the uneven pattern formed of the AG film, on the surface of the article to be subjected to the antireflection treatment without gaps. The change in the refractive index at the boundary between (air) and the surface of the article is made pseudo-continuous, almost all of the light is transmitted regardless of the interface of the refractive index, and the light reflection on the surface of the article is almost the same. Can be eliminated. The second low-reflection treatment layer 18 is adhered to the rear surface of the colored layer 16 via a transparent adhesive layer 17 having the opposite surface of the moth-eye structure.

As shown in FIG. 2, the pointer 20 has a pointer base 21, an indicator 22, and a pointer cap 23. The pointer 20 is rotated by the stepping motor 30 with the rotation center B as the central axis.

The pointer base 21 is made of a transparent resin and is integrally formed with the indicator 22. The pointer base 21 has a reflecting surface 21a that reflects the illumination light emitted from the light emitting element 50 toward the indicating unit 22. The indicator portion 22 has a shape extending in the radial direction from the pointer base portion 21 and indicates the index portion 10a of the cover plate 10. The pointer cap 23 is made of an opaque resin and is locked to the pointer base 21 by a locking claw (not shown). The pointer cap 23 has a circular shape when viewed from the front and covers the pointer base 21.

The stepping motor 30 is mounted on the circuit board 70, and rotates the pointer 20 with the rotation center B as the central axis. The bearing portion 32 of the stepping motor 30 is inserted through a through hole 71 formed in the circuit board 70. The stepping motor 30 has a rotating shaft 31 that is inserted into the bearing portion 32, and the boss portion 21b of the pointer base portion 21 is attached to the end portion of the rotating shaft 31.

The pointer-type instrument M is composed of a cover plate 10, a pointer 20, a stepping motor 30, and a light guide member 60. By instructing the index portion 10a of the cover plate 10 with the indicator portion 22, the speed of the vehicle and the rotation of the engine are indicated. Display the number.

As shown in FIG. 3, the liquid crystal display 40 includes a TFT-type liquid crystal display panel 41 and a backlight (not shown) that transmits and illuminates the liquid crystal display 40 from behind. The liquid crystal display 40 is arranged between the two pointer-type instruments M. The liquid crystal display panel 41 is a panel in which a liquid crystal cell is enclosed by sandwiching a liquid crystal material between two rectangular upper and lower glass base materials 41a, and polarizing plates 41b are attached to both sides thereof.

The liquid crystal display 40 has a rectangular display screen on the liquid crystal display panel 41, and displays various vehicle information (for example, navigation information) on the display screen. A part of the liquid crystal display 40 is hidden by the overlapping area 10c of the cover plate 10, and a part of the display screen (overlapping area 10c) is not visible, but the vehicle information is a display that is not hidden by the cover plate 10. Since it is displayed on the unit 40a, it is visible.

The liquid crystal display 40 has a first low reflection processing layer 42 formed on the front surface side of the liquid crystal display panel 41 so as to cover the display unit 40a. The first low reflection treatment layer 42 is formed by coating the front surface of the polarizing plate 41b with a film having a refractive index different from that of the polarizing plate 41b, and the light reflected on the surface of the polarizing plate 41b and the light reflected on the surface of the coated film. It is a surface coated with AR (Anti Reflection) that reduces reflection by the interference effect of. It may be an LR (Low Reflection) coating.

The light emitting elements 50 and 51 are each composed of one or two or more light emitting diodes (LEDs), and are mounted on the front surface of the circuit board 70. The light emitting element 50 is arranged in the peripheral portion of the through hole 71, and emits illumination light toward the pointer 20. The light emitting element 51 is arranged in the peripheral portion of the light emitting element 50, and emits illumination light toward the light receiving surface 61 of the light guide member 60.

The circuit board 70 is made of a hard wiring board in which a wiring pattern is formed on a base material made of glass epoxy resin. A stepping motor 30, light emitting elements 50, 51, and the like are mounted (mounted) on the circuit board 70. The circuit board 70 is arranged on the rear surface side of the liquid crystal display 40.

The light guide member 60 is made of a translucent resin, and has a light receiving surface 61 that faces the light emitting element 51 and receives the illumination light emitted by the light emitting element 51, and extends from the light receiving surface 61 toward the cover plate 10. A light guide unit 62, a reflection surface 63 that reflects the illumination light from the light guide unit 62 toward the outer peripheral side, and an emission unit 64 that reflects the illumination light reflected by the reflection surface 63 toward the cover plate 10. have.

The light guide member 60 has a substantially cylindrical shape around the rotation center B of the pointer 20, and the exit portion 64 is located on the back surface of the index portion 10a of the cover plate 10 and the overlapping region 10c. The exit portion 64 is sandwiched between the cover plate 10 and the liquid crystal display 40 on the back surface of the overlapping region 10c. Further, the light guide member 60 is locked to the case body 80 by an elastic locking piece (not shown).

By being formed in this way, the step formed by the end face of the second light transmitting portion 15a of the light shielding layer 15 is formed at a position invisible from the front surface by the ground color layer 13, so that the second low Even if air bubbles or the like are generated due to the step when the reflection processing layer 18 is attached, it can be made invisible.

Further, the second low-reflection processing layer 18 on the rear surface of the cover plate 10 and the first low-reflection processing layer 42 on the front surface of the liquid crystal display 40 allow external light between the cover plate 10 and the liquid crystal display 40. It is possible to suppress a decrease in visibility due to diffused reflection.

Further, since the colored layer 16 is interposed between the light-shielding layer 15 and the second low-reflection treatment layer 18, the step becomes smooth, and bubbles and the like when the second low-reflection treatment layer 18 is attached are present. Can be reduced.

Further, since the second low reflection processing layer 18 has a moth-eye structure, when the external light incident on the first light transmitting portion 10b passes through the cover plate 10, the second low reflection processing layer 18 has a moth-eye structure. It is possible to further suppress a decrease in visibility due to diffuse reflection of external light at the interface.

Further, since the first low reflection treatment layer 42 has an AR coating, the reflection of the light passing through the cover plate 10 can be reduced, so that the diffused reflection of the external light at the interface of the first low reflection treatment layer 42 It is possible to further suppress the decrease in visibility due to the above.

Further, since the colored layer 16 is smoke ink, the external light incident on the first light transmitting portion 10b is attenuated when passing through the cover plate 10, so that the second low reflection processing layer 18 and the second low reflection processing layer 18 and the second layer 16 are attenuated. It is possible to further suppress a decrease in visibility due to diffused reflection of external light at the interface of one low reflection processing layer 42.

Further, the light guide member 60 has a structure in which illumination light is irradiated in a radial direction perpendicular to the rotation center B of the pointer 20 to illuminate the cover plate 10 from behind, and a part of the cover plate 10 is displayed by a liquid crystal display. The cover plate 10 can be illuminated even in the overlapping region 10c that overlaps the vessel 40.

Although the display device C of the present invention has been described by taking the configuration of the above-described embodiment as an example, the present invention is not limited to this, and other configurations do not deviate from the gist of the present invention. It goes without saying that various improvements and design changes can be made in the above. For example, the liquid crystal display 40 provided with a backlight may be a self-luminous organic EL display.

The present invention relates to a display device for a vehicle, and can be applied to, for example, a display device for a vehicle mounted on a moving body including an automobile, a motorcycle, or an agricultural machine or a construction machine.

10 Cover plate 10b First light transmitting part 10c Overlapping area 13 Ground chromosphere (first opaque part)
15 Light-shielding layer (second opaque part)
15a Second light transmitting part 16 Colored layer (intermediate layer)
18 Second low reflection processing layer 40 Liquid crystal display (display)
40a Display unit 42 First low reflection processing layer 60 Light guide member C Display device

Claims (4)

A display having a display unit for displaying an image and
A display device including a cover plate that covers the front side of the display device.
The display has a first low reflection processing layer formed on the front side of the display so as to cover the display.
The cover plate has a first opaque portion formed on the front surface side of the cover plate having a first light transmitting portion that transmits light of the display portion, and a second larger than the first light transmitting portion. A second opaque portion formed on the rear surface side of the cover plate having the light transmitting portion of the above, and formed on the rear surface side of the second opaque portion and the rear surface side of the cover plate corresponding to the display portion. A display device comprising a second low reflection processing layer and an intermediate layer between the second opaque portion and the second low reflection treatment layer. The display device according to claim 1 , wherein the intermediate layer is a light-transmitting colored layer. The display device according to any one of claims 1 to 2 , wherein the second low reflection processing layer is a sheet material having a fine concavo-convex structure at intervals of visible light wavelength or less. The display device according to any one of claims 1 to 3 , wherein the first low reflection treatment layer is an AR coating.

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