JP2016142810A - Display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device for a vehicle which can prevent air bubbles or peeling on a display surface even if it is used under severe environment.SOLUTION: A display device for a vehicle comprises display means 1 having a display element for image display of vehicle information, a translucent substrate 311 holding the display means 1 and covering the display means 1, a light shield part 313 formed in close contact with the translucent substrate 311, and an adhesive member 4 making the display means 1 adhere to a plane part 311a of the translucent substrate 311. A frame part 313a of the light shield part 313 in contact with the translucent substrate 311 is formed on a back side of the plane part 311a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle display device housed in a case, and is suitable as a display device mounted on a moving body with vibration, such as a vehicle.

  As a conventional vehicle display device, for example, there is one disclosed in Patent Document 1. The display device according to Patent Document 1 has good visibility and strength by bonding a display unit such as a liquid crystal display element and a light-transmitting substrate in a defoamed state with an adhesive sheet made of a transparent optical adhesive film interposed therebetween. Glue properly.

  In addition, there is a type in which a photocurable transparent adhesive is not interposed between the display means and the translucent substrate (transparent body) between the display means and the translucent substrate, and is disclosed in, for example, Patent Document 2. In the display means of this patent document 2, the area other than the display area can be covered with a light-shielding ink provided on the light-transmitting substrate.

JP 2014-169618 A JP 2009-25833 A

  However, as shown in Patent Document 2, a member that partitions the display area, such as a light-shielding ink, generates a step that protrudes on the adhesive surface on the translucent substrate side. There was a problem that bubbles would easily enter from this stepped portion when bonded to the display means.

  In particular, when an adhesive structure made of a transparent resin is applied to a display device for a vehicle that firmly fixes a display in a case as described in Patent Document 1, it is suitable for thermal deformation due to a change in temperature environment and traveling of the vehicle. Due to the accompanying vibration, bubbles and peeling occur at the stepped portion on the display surface, and the visibility is lowered.

  Accordingly, an object of the present invention is to provide a vehicle display device that can prevent bubbles and peeling of the display surface even when the display device is used in a harsh environment, paying attention to the above-described problems.

The vehicle display device of the present invention includes:
Display means comprising a display element for displaying vehicle information as an image;
A translucent member that holds the display means and covers the display means;
A light shielding member that is molded in close contact with the light transmissive member;
An adhesive member for adhering the display means to the adherend surface of the translucent member;
In a vehicle display device comprising:
The frame portion of the light shielding member in contact with the light transmissive member is formed deeper than the adherend surface.

  Further, the frame portion is formed so as to cover an end portion of the display means.

  Further, the adhesive member is characterized by applying a curable transmissive resin.

  The adhesive member is a transparent optical adhesive double-sided adhesive sheet.

  The present invention can prevent bubbles and peeling of a display surface even in a display device for a vehicle used in a harsh environment.

The figure which shows the vehicle-mounted example of the meter which is embodiment of this invention. Sectional drawing which shows the meter which is embodiment same as the above. Sectional drawing which expanded the principal part of the meter which is embodiment same as the above. Sectional drawing which shows another example of the display holding | maintenance part of embodiment same as the above. Sectional drawing which shows another example of the display holding | maintenance part of embodiment same as the above.

  Hereinafter, an embodiment applied to a meter mounted on a motorcycle as an embodiment of a vehicle display device of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an instrument A mounted on a motorcycle B. The instrument A is provided so that the vehicle user can check the display in the driving state. In this case, the instrument A is mounted between the cowl (windshield) C and the handle D. The display screen of the meter A can be switched by operating a switch E provided on the handle D.

  2 and 3 are views showing a part of the meter A in cross section. The meter A includes a display unit 1, a circuit board 2, a case 3, and an adhesive member 4, and is provided so that vehicle information can be confirmed from the driver's seat.

  As the display means 1, for example, a TFT-type liquid crystal display element (display element) or a display unit provided with a backlight can be applied, and vehicle information from various sensors and various electronic control devices mounted on the vehicle can be represented by numerical values or characters. The image is displayed as an image such as a mark, and an image based on the supply of drive power from the circuit board 2 and the control signal from the control means 21 mounted on the circuit board 2 is output.

  In this case, it is provided so that it can be transmissively illuminated by a backlight (not shown). Further, as the vehicle information, the engine speed, the remaining amount of fuel, the traveling speed of the vehicle, and the like can be displayed. The display unit 1 is bonded to the case 3 via the bonding member 4 on the display surface side.

  A printed circuit board made of hard glass epoxy resin can be applied to the circuit board 2, a wiring pattern made of copper foil is formed, and a microcomputer for calculating a measured value based on vehicle information from an external device and the display means 1 are driven. Electronic parts such as a control unit 21 provided with a drawing processing unit for connecting to the external device and a cable 22 for cable connection are mounted.

  The control means 21 is electrically connected to the display means 1 via a flexible wiring board to a connector (not shown) of the circuit board 2, and transmits a drive signal to the liquid crystal display element of the display means 1 and the backlight. I do.

  The case 3 is provided with a display holding member 31, a circuit holding member 32, and a cover member 33.

  The display holding member 31 is formed by insert-molding a flat light-transmitting substrate (transparent member) 311 made of organic glass provided so that the display of the display means 1 can be desired, and a metal nut 312. A light shielding portion (light shielding member) 313 made of a synthetic resin material having a light shielding property different from that of the optical substrate 311 is formed. The translucent substrate 311 may be any substrate that protects the display unit 1 by covering at least the display area of the display unit 1 and allows the display of the display unit 1 to be viewed from the outside. Acrylic, polycarbonate, or inorganic glass can also be applied. In addition, a translucent member containing a colored material, so-called smoked glass, may be applied to the translucent substrate 311.

  In addition, as shown in FIG. 3, the translucent substrate 311 of the display holding member 31 is provided with a flat portion (bonded surface) 311 a for bonding and holding the display unit 1. Further, in the vicinity of the end portion of the flat portion 311a, the display area of the display unit 1 is partitioned, and a frame portion 313a of a light shielding unit 313 provided so as to cover the end portion of the display unit 1 is provided. The frame portion 313a prevents the inside of the meter A (internal parts other than the display unit 1) from being visible through the gap between the display unit 1 and the light shielding member 31, and prevents backlight illumination light from the display unit 1 from being exposed to the outside. Further, the frame portion 313a is provided in a recessed shape with respect to the flat surface portion 311a (adhesion location of the display unit 1), and a joint location between the translucent substrate 311 and the frame portion 313a is provided apart from the flat surface portion 311a. It is done.

  The circuit holding member 32 holds the circuit board 2 on the back side of the display unit 1. The cover member 33 stores the display means 1 and the circuit board 2 together with the display holding member 31 in an airtight manner.

  In the case 3, the display holding member 31 that holds the display means 1 and the circuit holding member 32 that holds the circuit board 2 connect the display means 1 and the circuit board 2 to each other, and then connect the metal nut 312 and the screw 314 to each other. Used to be screwed and held. In this case, the display unit 1 is in a floating state without being in contact with the circuit holding member 32.

  Further, in the state where the screw 314 is screwed, the display holding member 31 is reinforced from the back side by the circuit holding member 32 made of a relatively strong alloy material rather than the display holding member 31 which is the exterior of the meter A. it can. Further, the cover member 33 includes a rubber packing interposed in a gap with the display holding member 31, a porous film attached to a vent hole (not shown), a waterproof member that covers a hole corresponding to the connector 22 and allows a cable to pass therethrough. The components can be housed while being protected by the display holding member 31 and the cover member 33 from the external environment.

  As the adhesive member 4, an adhesive means made of an ultraviolet curable transparent resin for adhering the display means 1 to the back surface of the translucent substrate 311 of the display holding member 31 can be applied. The adhesive member 4 is applied to the flat portion 311a of the translucent substrate 311 or the display surface of the display unit 1, and is superposed so that bubbles do not enter between the display unit 1 and the translucent substrate 311. The display means 1 is bonded to the translucent substrate 311 by being irradiated with ultraviolet rays. In this case, a fine uneven surface is formed on the flat portion 311a made of organic glass, and the contact area with the bonding means 4 made of a transparent resin can be increased to increase the bonding strength.

  Further, when the display unit 1 and the translucent substrate 311 are overlapped, the adhesive member 4 protrudes into the gap between the frame portion 313a formed behind and the display unit 1 and is not required for bonding. The member 4 can also be fastened.

  Note that, as the adhesive member 4, a thermosetting or moisture curable transparent resin can be applied instead of the ultraviolet curable type. Further, the adhesive member 4 is not applied with a transparent resin, but an adhesive sheet can be applied and bonded to form an adhesive structure.

  The adhesive member 4 fills a gap (air gap) between the display means 1 (touch panel 12) surface and the translucent substrate 311 surface, thereby reducing generation of extra reflected light on each boundary surface and displaying with good visibility. Output is possible. Therefore, the adhesive member 4 is preferably made of a material having a refractive index close to that of the translucent substrate 311 and the display unit 1.

  In addition, when a double-sided adhesive sheet made of a transparent optical adhesive film is applied as the adhesive member, the display means 1 and the translucent substrate 311 are adhered in a defoamed state by bonding them together in a vacuum, etc. Good and strong adhesion can be performed. In this case, the flat portion 311a of the translucent substrate 311 can be a smooth surface and can be bonded with high transparency.

  Since a step or a bonding surface (boundary) at the time of insert molding is provided on the display holding member 31 side with respect to the bonding location by the bonding member 4, if the display holding member 31 is thermally deformed, Even when the vibration is generated and the stress is applied as the vehicle travels, the adhesive member 4 is less likely to be peeled off from the flat surface portion 311a because these hardly affect the bonded portion.

  Further, by using the metal nut 312, the light shielding part 313 and the circuit holding member 32 are screwed and held by the metal nut 312 and the screw 314, so that the hole of the synthetic resin is deformed by the screw thread. Since it can be screwed with a small torque compared with what is screwed, it can suppress the stress with respect to the display means 1 at the time of an assembly, Therefore The stress load to the light-shielding part 313 can be reduced. Further, since the adhesive surface of the adhesive member 4 is difficult to touch the joint where the stress is transmitted from the light shielding portion 313 to the translucent substrate 311, the screwed holding by the screw 314 is the adhesive state between the translucent substrate 311 and the display unit 1. It becomes a structure that is difficult to affect.

  Further, by applying a material having higher rigidity than that of the display holding member 31, the circuit holding member 32 can hold the display holding member 31 having relatively low rigidity while being supported and reinforced from the back side. Therefore, the deformation of the display holding member 31 can be reduced, and bubbles and peeling of the bonding surface between the display unit 1 and the translucent substrate 311 can be prevented, and the occurrence of distortion of the display unit can be prevented.

  Next, another example of the above embodiment will be described. In addition, about the location similar to the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 4 is a cross-sectional view of the display holding member 51. In this case, the flat portion 511a of the light transmitting substrate (light transmitting member) 511 is provided so as to cover the tip of the frame portion 513a of the light shielding portion (light shielding member) 513. It is done. With this structure, the contact area between the translucent substrate 511 and the light shielding member 513 is increased and the display holding member 51 becomes strong. Moreover, since the flat part 511a can be ensured widely and it can hold | maintain via the adhesive member 4 on the plane larger than the display area of the display means 1, adhesive strength can be made high.

  In addition, as shown in FIG. 5, by providing a step in the light shielding portion (light shielding member) 613, the contact area between the light transmitting substrate (light transmitting member) 611 and the light shielding portion 613 is increased, and the strong display holding member 61. It can also be. Further, as shown in the figure, the translucent substrate 611 can be overlapped at the same position in the same size as the display area of the display means 1, and it is possible to cope with the case of an exterior design different from the above embodiment.

  Such an instrument A is in close contact with the display means 1 having a display element for displaying vehicle information, a translucent substrate 311 that holds the display means 1 and covers the display means 1, and the translucent board 311. In the vehicular display device including the light-shielding part 313 that is molded and the adhesive member 4 that adheres the display unit 1 to the flat part 311 a of the light-transmitting substrate 311, the light-shielding part 313 that is in contact with the light-transmitting substrate 311. The frame part 313a is formed deeper than the flat part 311a.

  Accordingly, the structure is such that the adhesive member 4 is difficult to touch the frame portion 313a, and even if the adhesive member 4 touches, no significant effect on the bonding is produced. For this reason, it can prevent that peeling of the adhesion member 4 will generate | occur | produce from the difference of the expansion coefficient of the frame part 313a and the plane part 311a by thermal deformation, for example. Further, the structure is such that vibrations and impacts applied to the frame portion 313a are not easily transmitted to the adhesive member 4 directly. Therefore, even when applied to an instrument used in a harsh environment, bubbles and peeling of the display surface can be prevented and distortion of the display portion can be prevented.

  Further, the frame portion 313a is formed so as to cover the end portion of the display unit 1, whereby the internal structure other than the display region can be hidden.

  Although the display device of the present invention has been described as an example in the configuration of the above-described embodiment, the present invention is not limited to this, and the scope of the present invention is not deviated from other configurations. Of course, various improvements and display changes are possible. For example, the circuit holding member 32 is made of a synthetic resin, but may be made of metal.

  Further, only the screw 314 is used for the coupling between the display holding member 31 and the circuit holding member 32 as an example, but in addition, an engagement structure using a hook that hardly generates stress on the display surface of the display unit 1 or The welding structure may be replaced or combined and combined. Further, the display holding member can be formed by two-color molding of an organic glass translucent substrate (translucent member) made of acrylic or polycarbonate and a light-shielding member such as polypropylene or ABS resin, instead of insert molding. .

  In addition, the display unit 1 has been described as an example applied as a display unit including a backlight. However, only the liquid crystal display element may be bonded to the adherend surface (plane portion) of the light-transmitting substrate, or the organic EL Any display device such as a panel can be used instead, and the same effects as those of the above-described embodiment can be obtained. In addition, when a flexible display device is used as the display unit, the bonded surface may be a curved surface instead of a flat surface.

  The present invention relates to a display device that is mounted on a moving body such as a vehicle and displays various kinds of information. For example, the present invention can be applied as a vehicle display device mounted on a moving body including an automobile, a motorcycle, or an agricultural machine or a construction machine. Particularly, it is suitable for a meter used in an environment with intense vibration such as a special vehicle such as a construction machine or a motorcycle.

DESCRIPTION OF SYMBOLS 1 Display means 2 Circuit board 3 Case 31 Display holding member 311 Translucent board | substrate (translucent member)
311a Flat surface (bonded surface)
312 Metal nut 313 Shading part (shading member)
313a Frame 32 Circuit holding member 4 Adhesive member A Instrument (vehicle display device)

Claims (4)

Display means comprising a display element for displaying vehicle information as an image;
A translucent member that holds the display means and covers the display means;
A light shielding member that is molded in close contact with the light transmissive member;
An adhesive member for adhering the display means to the adherend surface of the translucent member;
In a vehicle display device comprising:
The vehicle display device, wherein a frame portion of the light shielding member in contact with the light transmissive member is formed deeper than the adherend surface.   The vehicle display device according to claim 1, wherein the frame portion is formed so as to cover an end portion of the display means.   The vehicular display device according to claim 1, wherein a curable transmissive resin is applied to the adhesive member.   The vehicular display device according to claim 1, wherein a transparent optical adhesive double-sided adhesive sheet is applied as the adhesive member.

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