JP2024008008A - display device - Google Patents

Abstract

To provide a display device that can reduce the number of components, in arranging an electronic component in a case member.SOLUTION: A display device 100 comprises a case member 3 with an insulation property, an electronic component 4 arranged in the case member 3, and a circuit board 5 arranged at a rear side of the case member 3. The electronic component 4 is electrically conducted to the circuit board 5 through conductive wiring 34, 341, 342 and 343 directly formed on the case member 3. The wiring 34, 341, 342 and 343 are formed to stretch across two surfaces: a first surface 3f on which the electronic component 4 is arranged of the case member 3 and a second surface 3r contacting the circuit board 5.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a display device, and is suitable, for example, as a display device that outputs information related to a vehicle.

Conventionally, as shown in Patent Document 1, the panel includes a panel having a sensor window, a middle case behind the panel, and a main circuit board behind the middle case, and an external light sensor and a sensor are mounted on the panel side of the middle case. An external light sensor unit consisting of a main circuit board is arranged, and the external light sensor unit and the main circuit board are connected by a cord passing through a notch in the inner case to electrically connect the two. By forming in this way, the external light sensor can be disposed close to the sensor window, and the illuminance of external light can be detected with high accuracy.

JP2020-046287A

However, there is a problem in that the number of parts increases, such as a sensor circuit board, a cord, and screws for fixing the sensor circuit board to the inner case.

Therefore, the present disclosure has been made in view of these points, and an object of the present disclosure is to provide a display device that can reduce the number of components when arranging electronic components in a case member.

In order to achieve the above object, the display device 100 of the present invention includes an insulating case member 3, an electronic component 4 disposed in the case member 3, and a circuit board 5 disposed behind the case member 3. The electronic component 4 and the circuit board 5 are electrically connected to each other by conductive wirings 34, 341, 342, and 343 formed directly on the case member 3.

FIG. 1 is a front view of a display device according to a first embodiment of the present disclosure. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is a perspective view of a recessed portion of the inner case of the present disclosure. FIG. 3 is a cross-sectional view according to a second embodiment of the present disclosure. FIG. 3 is a cross-sectional view according to a third embodiment of the present disclosure. FIG. 4 is a cross-sectional view according to a fourth embodiment of the present disclosure.

The present disclosure 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.

Although embodiments of the present disclosure will be described with reference to FIGS. 1 to 6, the present invention is not limited to these embodiments, and various changes can be made without departing from the present disclosure.

(First embodiment)
A display device 100 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. The display device 100 is mounted on a vehicle (for example, an automobile) and is configured as an instrument device that displays a predetermined measured quantity (vehicle speed, etc.).

In the following description, in order to facilitate understanding of the configuration of the display device 100, the direction in which the user sitting in the vehicle driver's seat is viewed from the display device 100 (display panel 1 side in FIG. 2) is referred to as " The front (front)" and the opposite side (circuit board 5 side in FIG. 2) are "rear".

As shown in FIGS. 1 and 2, the display device 100 includes a display panel (transmissive member) 1, a display 2 disposed on the rear surface 1r side of the display panel 1, a middle case (case member) 3, and a middle case. an external light sensor (electronic component) 4 disposed on the rear surface of the inner case 3; a circuit board 5 disposed on the second surface 3r side which is the rear surface of the inner case 3; It includes at least an inner case 3 and an outer case 6 that accommodates a circuit board 5.

The display panel 1 has, as a base material, a thin plate member 11 made of, for example, transparent or semi-transparent light-transmitting synthetic resin (for example, acrylic resin or polycarbonate resin). The display panel 1 has a light shielding layer 12 on the rear surface 1r side.

The light-shielding layer 12 is formed by printing black light-shielding ink on the rear surface 1r of the plate member 11. The light shielding layer 12 includes a light shielding part 1a, a first light transmitting part 1b, a second light transmitting part 1c, and an indicator design part 1d.

The light shielding portion 1a is a region shielded from light by the light shielding layer 12, and is formed at the outer edge of the display panel 1 with a predetermined width. The first light-transmitting portion 1b is formed inside the light-shielding portion 1a, and the light-shielding layer 12 is printed in a rectangular shape to maintain the light-transmitting properties of the plate member 11. The second light-transmitting portion 1c is formed in the light-shielding portion 1a, and is formed by punching and printing the light-shielding layer 12 in a circular shape.

A plurality of indicator design parts 1d are formed on the light shielding part 1a, and are formed by cutting out and printing various designs on the light shielding layer 12. The various designs include turn indicators that light up when the driver operates a turn signal, and designs for various operating lights and warning lights for vehicles.

The display 2 includes a display unit that includes a liquid crystal panel, an optical member, a light guide member, a light source, etc. from the front inside a metal casing. The liquid crystal panel is, for example, a TFT (Thin Film Transistor) type liquid crystal panel, and displays images of various vehicle information using digital images. The display device 2 has a plurality of boss portions 22 projecting in a cylindrical shape on the rear side, and screws 81, which are fixing members inserted from the circuit board 5, are screwed into the boss portions 22 and fixed to the circuit board 5. be done.

The display device 2 has a rectangular outer shape similar to the first light-transmitting portion 1b when viewed from the front, and is arranged on the rear surface 1r side of the display panel 1 so as to face the first light-transmitting portion 1b. Ru. The display surface 21 of the display device 2 is visible to the driver through the first light-transmitting portion 1b. The display surface 21 displays, for example, vehicle speed, engine speed, cumulative mileage, possible cruising distance, average fuel consumption, and the status of other vehicles in the vicinity. The display state (display content) of the display 2 is controlled by a control section (not shown).

The inner case 3 is made of white insulating synthetic resin (for example, polypropylene), and is arranged between the display panel 1 and the circuit board 5. A first surface 3f that is the front surface of the middle case 3 contacts the display panel 1, and a second surface 3r that is the rear surface of the middle case 3 contacts the circuit board 5. As shown in FIG. 3, the middle case 3 includes a housing part 31, a recessed part 32, a lighting part 33, a case wiring part (wiring part) 34, and a fixing part 35.

The accommodating part 31 is formed in a position facing the first transparent part 1b, is formed in a cylindrical shape so as to pass through the first surface 3f and the second surface 3r, and accommodates the display 2. The recessed portion 32 is formed in the first surface 3f and at a position facing the second light-transmitting portion 1c, and is formed in a recessed shape consisting of a bottom surface 32a opening toward the display panel 1 and a side wall 32b. The illumination part 33 is formed in a position facing the indicator design part 1d, is formed in a cylindrical shape so as to pass through the first surface 3f and the second surface 3r, and accommodates the light source 7.

The light source 7 is comprised of a top-view type LED (Light Emitting Diode: chip type light emitting diode) that emits an appropriate color, and is arranged within the illumination section 33 . The light emitted from the light source 7 passes through the illumination section 33, passes through the indicator design section 1d, and is visible to the viewer.

The external light sensor 4 is, for example, a photodiode, and detects the illuminance of external light and emits an electrical signal. The signal emitted by the external light sensor 4 is transmitted to the circuit board 5. The external light sensor 4 is arranged in the recess 32 and fixed to the bottom surface 32a with an adhesive member (adhesive, double-sided tape, etc.). The external light sensor 4 is arranged opposite to the circuit board 5. The recessed portion 32 disposes the external light sensor 4 close to the display panel 1 and prevents light from entering from other than the second light-transmitting portion 1c.

The circuit board 5 is made of a hard wiring board in which a wiring pattern 51 is formed on a flat glass epoxy base material such as FR-4 (Flame Retardant-4). and middle case 3. The circuit board 5 mounts the light source 7 and includes various circuit components (not shown) such as the display 2, the external light sensor 4, a control unit that outputs command signals for driving and controlling the light source 7, resistors, and capacitors. is conductively connected to the wiring pattern.

The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and executes predetermined arithmetic processing according to a program written in the ROM, for example. The control unit acquires various vehicle information from an ECU (Electronic Control Unit) of the vehicle. The control unit controls the display panel 10 and turns on the light source 7 based on the acquired information. The control unit controls the brightness of the display 2 based on information regarding external light acquired from the external light sensor 4.

The outer case 6 is made of a black light-absorbing and thermoplastic synthetic resin (for example, ABS resin), and is formed in the shape of a rectangular parallelepiped box with an open front side. The outer case 6 has its front side in contact with the display panel 1 via an adhesive member (adhesive, double-sided tape, etc.), and accommodates the display 2, the inner case 3, and the circuit board 5 inside the display panel 1.

The case wiring portion 34 is a wiring pattern formed by directly forming conductive copper foil or the like of the same type as the wiring pattern 51 of the circuit board 5 on the surface of the inner case 3 . The case wiring section 34 is formed by a plating method, a method of forming a film-like pattern by insert molding, or the like. As shown in FIGS. 2 and 3, the case wiring section 34 is a three-dimensional resin component (inner case 3) is formed on the surface of.

Specifically, the case wiring section 34 is formed on the bottom surface 32a so as to extend in the Y direction in the figure so as to include the space between the external light sensor 4 and the bottom surface 32a so as to come into contact with the terminal section of the external light sensor 4. Then, it is formed to extend in the X direction in the figure. The case wiring section 34 is then formed on the side wall 32b so as to extend in the Z direction in the figure, and then on the first surface 3f so as to extend in the X direction.

The case wiring section 34 is then formed to extend in the Z direction on the third surface 3s, which is a side surface of the inner case 3, and then formed to extend in the Y direction on the second surface 3r. The surface 3r contacts the wiring pattern 51. The case wiring section 34 has two wires corresponding to the two terminals of the external light sensor 4. In this way, the case wiring section 34 is formed so as to span multiple surfaces.

Although not shown, the middle case 3 has a corner 371 formed by the bottom surface 32a where the case wiring section 34 is formed and the side wall 32b, a corner 372 formed by the side wall 32b and the first surface 3f, and a first surface. A corner 373 formed by the third surface 3f and the third surface 3s, and a corner 374 formed between the third surface 3s and the second surface 3r are formed in a curved shape (arc shape), which improves the manufacturability of the case wiring section 34. This improves the performance and prevents disconnection of the case wiring section 34.

The fixing portion 35 is formed on the second surface 3r near where the case wiring portion 34 and the wiring pattern 51 come into contact. The inner case 3 is fixed to the circuit board 5 by screwing screws 82, which are fixing members inserted from the circuit board 5, into the fixing portion 35.

By forming the external light sensor 4 in this way, the number of parts for energizing the external light sensor 4 and the circuit board 5 can be reduced, and the external light sensor 4 can be placed close to the second light-transmitting part 1c, thereby reducing the external light. Illuminance can be detected with high accuracy.

(Second embodiment)
A second embodiment of a display device 200 according to the present disclosure will be described based on FIG. 4. The same parts and equivalent parts as in the first embodiment described above will be described with the same reference numerals.

In this embodiment, the middle case 3 has an elastic section 36 . The elastic part 36 is formed on the third surface 3s, and slits that open toward the second surface 3r are formed on both sides in the direction orthogonal to the cross section in FIG. It is formed into a cantilever shape with a free end 36b on the side. The free end 36b is bent so that its tip is parallel to the circuit board 5.

The elastic portion 36 has a bent portion 36c bent in a dogleg shape between the fixed end 36a and the free end 36b. The elastic portion 36 contacts the circuit board 5 side with a light pressure applied thereto.

The case wiring section 341 is formed on the surface of the inner case 3 so that the terminal section of the external light sensor 4 and the wiring pattern 51 are electrically connected. Case wiring portion 341 is formed in recess 32 and third surface 3s similarly to case wiring portion 34, and then formed in elastic portion 36. The case wiring portion 341 is formed to pass through the fixed end 36a, the bent portion 36c, and the free end 36b on the third surface 3s. The case wiring portion 341 is formed up to the surface of the bent portion 36c facing the wiring pattern 51, and comes into contact with the wiring pattern 51.

By forming in this way, even if the display device 200 vibrates due to vibrations of the vehicle, the energization between the case wiring section 341 and the wiring pattern 51 (the energization between the external light sensor 4 and the circuit board 5) is maintained. The illuminance of external light can be detected with high accuracy.

(Third embodiment)
A third embodiment of a display device 300 according to the present disclosure will be described based on FIG. 5. The same parts and equivalent parts as in the first embodiment described above will be described with the same reference numerals.

In the first embodiment, the recess 32 was formed on the first surface 3f, but in this embodiment, the recess 38 is formed on the third surface 3s. The external light sensor 4 is arranged on the bottom surface 38a of the recess 38.

The case wiring section 342 is formed on the surface of the inner case 3 so that the terminal section of the external light sensor 4 and the wiring pattern 51 are electrically connected.

The outer case 6 has a light-transmitting part 61 at a position facing the external light sensor 4. The light-transmitting portion 61 is made of a light-transmitting synthetic resin (for example, acrylic), and is integrally formed with the outer case 6 .

By forming the external light sensor 4 in this way, even when the external light sensor 4 is arranged on a surface perpendicular to the circuit board 5 of the inner case 3, the number of parts required to conduct electricity between the external light sensor 4 and the circuit board 5 can be reduced. can do.

(Fourth embodiment)
A fourth embodiment of a display device 400 according to the present disclosure will be described based on FIG. 6. The same parts and equivalent parts as in the first embodiment described above will be described with the same reference numerals.

In this embodiment, the middle case 3 has a separating portion 3g. The spacing portion 3g is a surface facing the circuit board 5 that is formed at a position separated from the circuit board 5 by a predetermined height. The spacing portion 3g is provided at a position facing the wiring pattern 51.

The case wiring section 343 is formed on the surface of the middle case 3. Case wiring part 343 is formed in recess 32 and third surface 3s, like case wiring part 34, and then formed in separation part 3g.

The circuit board 5 is bent in a Z shape and has elastic conductive terminals 9 mounted thereon. The terminal 9, which is disposed at a position facing the separation part 3g, comes into contact with the case wiring part 343 while applying a light pressure to the separation part 3g side.

In the first embodiment, the middle case 3 was fixed to the circuit board 5 with screws 82, but in this embodiment, the middle case 3 has a hook part (fixing part) 39, and this hook part 39 is connected to the circuit board 5. It is fixed to the circuit board 5 by inserting the board 5 and being locked. The hook portion 39 is formed near where the case wiring portion 343 and the terminal 9 come into contact.

By forming in this way, even if the display device 200 vibrates due to vibrations of the vehicle, the energization between the case wiring section 343 and the wiring pattern 51 (the energization between the external light sensor 4 and the circuit board 5) is maintained. The illuminance of external light can be detected with high accuracy.

Note that the present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the gist of the present disclosure.

For example, in the above-described embodiment, the external light sensor 4 is a light source (electronic component) made of an LED, and the second light-transmitting portion 1c and the light-transmitting portion 61 are activated by an immobilizer (anti-theft device). It may also be used as a security indicator (an anti-theft device activation light) to notify the driver.

1 Display panel (transparent member)
1a Light-shielding part 1b First light-transmitting part 1c Second light-transmitting part 1d Indicator design part 1r Rear surface 11 Plate member 12 Light-shielding layer 2 Display 21 Display surface 22 Boss part 3 Middle case (case member)
3f First surface 3g Separation section 3r Second surface 3s Third surface 31 Accommodation section 32 Recessed section 32a Bottom surface 32b Side wall 33 Lighting section 34 Case wiring section 341 Case wiring section 342 Case wiring section 343 Case wiring section 35 Fixing section 36 Elastic part 36a Fixed end 36b Free end 36c Bent part 371 Corner part 372 Corner part 373 Corner part 374 Corner part 38 Recessed part 38a Bottom surface 39 Hook part (fixed part)
4 Ambient light sensor (electronic component)
5 Circuit board 51 Wiring pattern 6 Outer case 61 Transparent part 7 Light source 81 Screw 82 Screw 9 Terminal

Claims (6)

an insulating case member,
an electronic component disposed in the case member;
a circuit board disposed behind the case member;
A display device characterized in that the electronic component and the circuit board are electrically connected to each other by conductive wiring formed directly on the case member. A claim characterized in that the wiring is formed so as to straddle two surfaces of the case member, a first surface on which the electronic component is arranged and a second surface that comes into contact with the circuit board. The display device according to item 1. The electronic component and the circuit board are arranged to face each other with the case member interposed therebetween,
The wiring is formed to span three surfaces: the first surface, the second surface, and a third surface between the first surface and the second surface of the case member. The display device according to claim 2, characterized in that: a transparent member disposed at a position facing the first surface;
The case member has a recess that opens on the transparent member side of the first surface,
4. The display device according to claim 3, wherein the electronic component is placed in the recess. The case member has an elastic part,
2. The display device according to claim 1, wherein the wiring is formed on the elastic portion and comes into contact with the circuit board. 2. The display device according to claim 1, wherein the case member has a fixing portion for fixing the case member and the circuit board near where the wiring contacts the circuit board.

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