JP2021128225A - Display device for vehicle - Google Patents

Abstract

To provide a display device for a vehicle in which a wiring of a touch panel is protected and a high reliability is attained.SOLUTION: The present invention includes: a transparent protective cover 11; a touch panel 3 over the protective cover 11 with a first transparent adhesive member 2 in between, the touch panel including a transparent substrate 31, a transparent electrode 32 on a surface of the transparent substrate 31, and a wire 33 on the outside of the transparent electrode 32; and a liquid crystal panel 51 over the touch panel 3 with a second transparent adhesive member 4 in between, the liquid crystal panel displaying an image, the touch panel 3 having a frame-like protective member 34 over the wire 33.SELECTED DRAWING: Figure 4

Description

The present invention relates to a vehicle display device including a touch panel and a display panel for displaying an image, and is suitable for, for example, a vehicle display device mounted on an instrument panel.

Conventionally, some touch panels are configured by providing a transparent electrode on a transparent substrate and a lead-out wiring on the outside thereof, and are disclosed in, for example, Patent Document 1. Further, there is a structure in which a similar touch panel and an image display panel such as a liquid crystal display panel are overlapped with each other via an adhesive layer, and is disclosed in, for example, Patent Document 2.

Japanese Unexamined Patent Publication No. 2016-206867 Japanese Unexamined Patent Publication No. 2016-130747

However, when these display devices are mounted on a vehicle, since the electrodes and wiring of the touch panel are exposed, other metal parts (conductive members) may come into contact with the vibration caused by the running of the vehicle, or due to dew condensation. It has been a problem because there is a possibility of short circuit and corrosion due to contact with water droplets.

Therefore, an object of the present invention is to pay attention to the above-mentioned problems and to provide a highly reliable vehicle display device in which the wiring of the touch panel is protected.

The vehicle display device of the present invention
With a transparent protective cover,
A touch panel which is superposed on the protective cover via a transparent adhesive member and is provided with a transparent substrate, a transparent electrode on the surface of the transparent substrate, and wiring formed on the outside of the transparent electrode.
This touch panel is provided with an image display panel that is superposed on the touch panel via a transparent adhesive member and displays an image.
The touch panel is provided with a frame-shaped protective member that covers the wiring.

Further, the image display panel is a display unit having a metal bezel.

Further, the transparent adhesive member between the touch panel and the image display panel is provided so as to overlap at least the inner end portion of the protective member and the transparent electrode.

Further, the protective member is made of an electrically insulating synthetic resin sheet and is adhered to the touch panel so as to cover at least the outer end portion of the wiring.

According to the present invention, the wiring of the touch panel is protected to provide a highly reliable display device for vehicles.

The figure which shows the vehicle-mounted state of the display device for a vehicle in embodiment of this invention. The front view of the vehicle display device in the same embodiment. The figure which shows the iii-iii cross section of FIG. The enlarged view which shows the iv part of FIG.

Hereinafter, as an embodiment of the present invention, an embodiment applied to a vehicle display device mounted on an automobile will be described as an example based on the accompanying drawings.

FIG. 1 shows a vehicle display device A mounted on an automobile (vehicle) B. The vehicle display device A is provided so as to face the driver's seat so that the vehicle user can visually recognize the display in the driving state. In this case, the vehicle display device A is provided so as to project above the instrument panel C. Further, the vehicle display device A can display and output vehicle information, route guidance, sound-related information, and the like. In addition, the vehicle user can also perform display operations (screen switching) and various settings by operating the switch D1 provided on the touch panel and the steering D, which will be described later, according to the display contents of the vehicle display device A.

As shown in FIGS. 2 to 4, the vehicle display device A includes a housing 1, a first transparent adhesive member (transparent adhesive member) 2, a touch panel 3, and a second transparent adhesive member (transparent adhesive member). ) 4, a display unit 5, and a circuit board 6. In this case, the vehicle display device A can be operated by the fingertips of the vehicle user as an interface for performing images taken outside the vehicle, various vehicle information, air conditioner settings, route guidance, acoustic operations, and the like. It is a display device to be displayed.

The housing 1 is composed of a protective cover 11 and a case 12. A transparent plate material such as inorganic glass or organic glass (acrylic resin) can be applied to the protective cover 11, and the inside of the housing 1 is protected while allowing the display image of the display unit 5 to be seen through. The protective cover 11 is arranged so as to cover the touch panel 3 and the display unit 5, and a black light-shielding layer 11a is formed in a frame shape by painting so as to hide a portion other than the display area. A gradation with different dot shapes and color tones can be formed at the boundary between the light-shielding layer 11a and the display area inside the light-shielding layer 11a to make the boundary inconspicuous.

A light-shielding synthetic resin material can be applied to the case 12, and in this case, a plurality of cases 12 and 12 are fitted, and together with the protective cover 11, parts such as the touch panel 3 and the display unit 5 are housed and directly touched from the outside. Protect it from being unable to do so. The case 12 holds the protective cover 11 in close contact with the outer periphery of the protective cover 11 by means such as adhesion, welding, and insert molding. The case 12 may be any light-shielding member, and a metal material may be applied.

The first transparent adhesive member 2 is provided on the inner surface of the protective cover 11 (on the side of the accommodation space having the display unit 5 and the like), and adheres and holds the touch panel 3. A transparent adhesive sheet can be applied to the first transparent adhesive member 2, and a material having a value close to the value of the refractive index of the protective cover 11 or the touch panel 3 is preferable. In this case, an elastic silicone-based adhesive sheet is used. Use. The first transparent adhesive member 2 is adhered so as to overlap the entire display area determined by the light-shielding layer 11a and a part of the light-shielding layer 11a (at least the inner end of the light-shielding layer 11a), and is bonded to the protective cover 11 and the first. The light reflection generated at the interface with the transparent adhesive member 2 is reduced to ensure the visibility of the display by the display unit 5.

The first transparent adhesive member 2 may be one in which a curable adhesive is filled between the protective cover 11 and the touch panel 3 and cured. For example, an ultraviolet curable modified silicone-based adhesive is used. It is an agent and has rubber elasticity after curing. In this case, the first transparent adhesive member 2 is not limited to the ultraviolet curable adhesive, but is a thermosetting type, a moisture curing type, or a hybrid curing type (ultracuring + thermosetting, ultraviolet curing + moisture) of them and ultraviolet curing. It may be a cured adhesive. Further, the main component of the first transparent adhesive member 2 may be another type such as acrylic or urethane instead of silicone, but it contains a material having a polar group and has a refractive index equivalent to that of the protective cover 11. It is preferable to use. The polar group preferably contains at least one of a hydroxyl group, an amino group, a carboxyl group, a thiol group, a cyano group and a silanol group.

The touch panel 3 is provided with a transparent substrate 31, a transparent electrode 32, a wiring 33, and a protective member 34. The touch panel 3 detects the presence / absence of operation and the operation coordinates based on the change in capacitance when the fingertip of the vehicle user approaches.

An inorganic glass plate can be applied to the transparent substrate 31, and in this case, transparent electrodes 32 and wiring 33 are formed on both sides.

In the transparent electrode 32, an electrode layer such as ITO (Indium Tin Oxide) is formed as a thin film in a predetermined shape by means such as sputtering or etching at a portion of the transparent substrate 31 corresponding to the display region.

The wiring 33 is a metal layer provided on the outside of the transparent electrode 32. For example, a material having a higher conductivity than the transparent electrode 32 such as nickel or gold is preferable, and each electrode of the transparent electrode 32 and an external terminal (not shown) ( Electrically connect to the connector). The wiring 33 is formed intensively on the outer side of the transparent electrode 32 and on the end side of the transparent substrate 31 surface, and in this case, includes a ground wiring formed so as to surround the transparent electrode 32 as a noise countermeasure.

The protective member 34 is preferably an electrically insulating synthetic resin sheet, in which case PET (polyethylene terephthalate), TAC (triacetyl cellulose) or the like can be applied. The protective member 34 is provided on the surface of the display unit 5 side, is formed in a frame shape so as to cover (overlap) the wiring 33, and is provided by being adhered and held to the transparent substrate 31 and the wiring 33 by an adhesive material. In this case, the protective member 34 covers at least the outer end of the wiring 33, and the remaining wiring 33 is covered by the second transparent adhesive member 4. The protective member 34 may cover the entire wiring 33. Since the wiring 33 is not exposed by the protective member 34 or the like, it is possible to prevent the wiring 33 from being short-circuited or corroded even when dew condensation occurs depending on the usage environment of the vehicle. Further, by providing the protective member 34 in a frame shape outside the display area, the wiring 33 can be protected without affecting the display visibility of the display unit 5 from the vehicle user.

Similar to the first transparent adhesive member 2, a transparent adhesive sheet can be applied to the second transparent adhesive member 4, and the value is close to the value of the refractive index of the portion through which the display image of the touch panel 3 or the display unit 5 is transmitted. The material is suitable, for example, a silicone-based adhesive sheet having rubber elasticity. The second transparent adhesive member 4 adheres the touch panel 3 and the display unit 5, one surface is adhered to the transparent electrode 32, the protective member 34, and the wiring 33, and the other surface is the display unit 5. It is adhered to the part including the display area.

The display unit 5 is provided with a liquid crystal panel (image display panel) 51, a backlight portion 52, and a metal bezel 53.

The liquid crystal panel 51 is arranged outside each transparent glass substrate, that is, two transparent glass substrates (transparent plates) on which transparent electrodes are printed, a liquid crystal that is sealed so as to be sandwiched between the transparent glass substrates. A liquid crystal display element provided with a polarizing plate can be applied. The liquid crystal panel 51 can act on the liquid crystal display to form a desired display image (image) by applying electricity applied to the transparent electrode via an FPC (flexible wiring board) (not shown). The liquid crystal panel 51 continuously forms transparent wiring extending outward from the transparent electrodes between the transparent glass substrates, and the FPC 23 and the driver 22 are mounted on the wiring via an anisotropic conductive film.

Although not shown in detail, the backlight unit 52 transmits and illuminates the liquid crystal panel 51 using an LED (light emitting diode) as a light source. In addition to the LED, a light diffusion sheet, a prism sheet, or the like is used to transmit the liquid crystal panel 51. Provide a structure that uniformly illuminates the light source.

The metal bezel 53 is formed by pressing a metal plate material such as SUS (stainless steel) into a predetermined shape to form a frame shape surrounding the liquid crystal panel 51, and the liquid crystal panel 51 and a backlight portion laminated on the liquid crystal panel 51. While surrounding the side surface side of the 52, the liquid crystal panel 51 and the like are firmly held. Even when the touch panel 3 and the metal bezel 53 come close to each other due to vibration caused by the running of the vehicle or the tolerance of the metal bezel 53 or the second transparent adhesive member 4, the wiring 33 and the metal bezel 53 are provided by the protective member 34 described above. Can be prevented from coming into contact with.

The circuit board 6 has a wiring pattern made of copper foil formed on a base material made of glass epoxy resin, and is held in a case 12 in a housing 1 to transmit a touch panel 3 and a display unit 5 and a detection signal and a drive signal. It is connected via a communication line 61 for communication. Further, on the circuit board 6, drive power is input from the outside of the connector 62 for connecting to the communication line 61 and the vehicle display device A, and data for image display and the touch operation state are input to the vehicle-mounted ECU (electronic control). It is equipped with various electronic components that make up an external connector that connects to various cables for transmitting to the unit), a control circuit for a microcomputer, a drawing calculation circuit, and a power supply circuit for obtaining a predetermined voltage that drives them. There is. In this case, although the circuit board 6 is held inside the housing 1, it can be provided outside the housing 1 via the same communication line or cable, or can be driven and controlled by an in-vehicle ECU. ..

Such a vehicle display device A is superposed on a transparent protective cover 11 and the protective cover 11 via a first transparent adhesive member 2, and has a transparent substrate 31 and a transparent electrode 32 on the surface of the transparent substrate 31. A touch panel 3 provided with a wiring 33 formed on the outside of the transparent electrode 32, and a liquid crystal panel 51 superposed on the touch panel 3 via a second transparent adhesive member 4 to display an image. 3 is provided with a frame-shaped protective member 34 that covers the wiring 33.

Therefore, the vehicle display device A is protected by covering the wiring 33.

Further, the liquid crystal panel 51 is a display unit 5 having a metal bezel 53, which is a general-purpose display unit and has a proof stress such as vibration and noise of a vehicle. Even in this case, the wiring 33 is protected and the display device for a vehicle is highly reliable.

Further, the second transparent adhesive member 4 between the touch panel 3 and the liquid crystal panel 51 is provided so as to overlap at least the inner end portion of the protective member 34 and the transparent electrode, so that the wiring 33 and the transparent on the three surfaces of the touch panel are transparent. The electrode 32 can be covered and these can be protected.

The protective member 34 is made of an electrically insulating synthetic resin sheet and is adhered to the touch panel 3 so as to cover at least the outer end of the wiring 33, so that the vehicle environment is harsh such as traveling in a humid environment or uneven road surface. Even so, it is a display device for vehicles that can prevent problems such as water damage and short circuits.

Although the embodiments of the present invention have been described above, the present invention is not construed as being limited to the above-described embodiments, and can be applied to various embodiments without departing from the gist thereof. The present invention is suitable as a display device mounted on an instrument panel, and may have a configuration applied to an instrument device E provided at a position facing through a steering D shown in FIG. 1, for example, and the above-described embodiment. The same effect as

Further, as the display unit 5, an organic EL panel can be applied instead of the liquid crystal panel 51 illuminated by the backlight unit 52. In this case, since the backlight portion can be omitted, the thickness becomes thinner.

Further, although the protective cover 11 is shown as a flat plate, the above-described embodiment can be applied even if the protective cover 11 has a shape that bends up and down or left and right, or a shape that bends in an S shape, and has the same effect as that of the above-described embodiment. Can be obtained.

Further, the present invention is suitable as a vehicle display device mounted on, for example, an automobile, a motorcycle, or a moving body equipped with an agricultural machine or a construction machine.

1 Housing 11 Protective cover 11a Light-shielding layer 12 Case 2 First transparent adhesive member (transparent adhesive member)
3 Touch panel 31 Transparent substrate 32 Transparent electrode 33 Wiring 34 Protective member 4 Second transparent adhesive member (transparent adhesive member)
5 Display unit 51 Liquid crystal panel (image display panel)
52 Backlight part 53 Metal bezel 6 Circuit board A Vehicle display device

Claims (4)

With a transparent protective cover,
A touch panel which is superposed on the protective cover via a transparent adhesive member and is provided with a transparent substrate, a transparent electrode on the surface of the transparent substrate, and wiring formed on the outside of the transparent electrode.
This touch panel is provided with an image display panel that is superposed on the touch panel via a transparent adhesive member and displays an image.
A vehicle display device characterized in that the touch panel is provided with a frame-shaped protective member that covers the wiring. The vehicle display device according to claim 1, wherein the image display panel is a display unit having a metal bezel. The vehicle display device according to claim 1, wherein the transparent adhesive member between the touch panel and the image display panel is provided so as to overlap at least an inner end portion of the protective member and the transparent electrode. .. The vehicle display device according to claim 1, wherein the protective member is made of an electrically insulating synthetic resin sheet and is adhered to the touch panel so as to cover at least the outer end of the wiring.

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