JP2016013814A - Vehicle display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle display device which inhibits hindrance to visibility of the display.SOLUTION: A vehicle display device displays vehicle information and includes: a display module 10 which displays the information; a circuit board 20 on which a circuit element 4a for controlling the display is mounted; and a holding frame 30 which has an opening for exposing the display module 10, holds the display module 10, and fastens the display module 10 to the circuit board 20. The holding frame 30 integrally includes: a body part 32; and fastening plate parts 35a to d which are fastened to the circuit board 20 by screws 50 at the outer side of the body part 32. Each of the fastening plate parts 35a to d includes a washer part 37 in which a passing hole 37c for inserting the screw 50 is formed, the washer part 37 which is recessed to the opposite side of the circuit board 20 and fastened by the screw 50 to be elastically deformed.

Description

  The present invention relates to a vehicle display device that displays vehicle information.

  Conventionally, a vehicular display device that displays vehicle information is known. In the vehicle display device disclosed in Patent Document 1, the rear metal shielding member is fixed to the backlight panel together with the back cover that covers the rear surface of the main circuit board with screws. Then, the holding frame is fastened with a flat pad on the back cover with screws.

JP 2009-265238 A

  However, in the apparatus disclosed in Patent Document 1, since the circuit board is disposed in the holding frame, the heat dissipation of heat generated from the circuit elements is poor. For this reason, the inventors of the present invention have a configuration in which the circuit board is arranged outside the holding frame, that is, the holding frame is integrally formed with the main body portion and the fastening plate portion that is fastened to the circuit board with screws on the outside of the main body portion. The configuration of the above was studied.

  However, when the holding frame is fastened to the circuit board with a screw with a screw in such a configuration, the circuit board is twisted or warped during fastening and during the action of vibration or heat of the vehicle, and integrated with the fastening plate portion. Twist or warp is transmitted to the main body. As a result of the deformation of the display module due to such twisting or warping, there has been a problem that the visibility of display is hindered.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle display device that suppresses the hindrance to display visibility.

One of the disclosed inventions is a vehicle display device that displays vehicle information,
A display module (10) for performing display;
A circuit board (20) on which circuit elements (4a) for controlling display are mounted;
A holding frame (30) having an opening (33) for exposing the display module and holding the display module and fastening the display module to the circuit board;
The holding frame integrally has a main body portion (32) and fastening plate portions (35a, 35b, 35c, 35d) fastened to the circuit board by screws (50) outside the main body portion,
The fastening plate portion is recessed toward the opposite side of the circuit board, has a through hole (37c) through which a screw is passed, and has a washer portion (37) that is tightened by the screw and elastically deformed. .

  According to such an invention, in the fastening plate portion integrally formed with the main body portion in the holding frame, the washer portion in which the through hole through which the screw is passed is recessed toward the side opposite to the circuit board. Yes. As a result, the washer portion tightened with the screw is elastically deformed, so that the tightening force to the circuit board by the screw can be increased. Even when the circuit board is twisted or warped due to vibration, heat of the vehicle, or the like, the force is absorbed by the elasticity of the washer portion. As described above, the display module can be prevented from being deformed due to twisting or warping being transmitted to the main body unit integrated with the fastening plate unit, so that it is possible to suppress the hindrance to display visibility.

  In addition, another one of the disclosed invention is characterized in that a plurality of slits (37d) communicating with the through hole are formed around the screw in the washer portion.

  According to such an invention, the washer portion tightened with the screw is elastically deformed while narrowing the width of the plurality of slits formed around the screw and communicating with the through hole, thereby increasing the tightening force and twisting the circuit board. Alternatively, the warp can be absorbed. Therefore, the display module can be prevented from being deformed by twisting or warping being transmitted to the main body portion integral with the fastening plate portion, and hence it is possible to suppress troubles in display visibility.

  In addition, in another one of the disclosed invention, the fastening plate portion has a plurality of protrusions (38) protruding toward the circuit board side around the washer portion.

  According to such an invention, the plurality of protrusions protrude toward the circuit board side around the washer portion in the fastening plate portion. According to this, since the tightening force received by the washer portion is concentrated on each protrusion, the protrusions can be reliably pressed against the circuit board. Therefore, even if twisting or warping occurs in the main body portion integrated with the fastening plate portion, the reaction force of the protrusion is absorbed by the washer portion. As described above, since the display module can be prevented from being deformed, it is possible to suppress a problem in display visibility.

  In addition, the code | symbol in a parenthesis is only what exemplifies the structure corresponding to embodiment mentioned later, in order to make an understanding of description content easy, and does not limit the content of invention.

It is a front view showing typically the display for vehicles in one embodiment. It is a front view which shows the display module and holding frame in one Embodiment. It is a side view which shows the display module and holding frame in one Embodiment. It is a rear view which shows the display module and holding frame in one Embodiment. It is a figure which shows typically the internal structure of the display module in one Embodiment. It is a figure which shows the fastening state by the screw | thread of FIG. It is a figure which shows the fastening state by the screw | thread of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  A vehicle display device 100 according to an embodiment of the present invention shown in FIG. 1 includes a combination meter 2, a control unit 4, and the like, and can display vehicle information.

  A combination meter 2 installed on an instrument panel in front of a seat in a vehicle is provided with a digital display 2a and an analog display 2b on a display board 3.

  Each of the plurality of analog display portions 2b has a pointer 2c, and the pointer 2c can be driven to rotate by an individual driving source 2d such as a stepping motor. The pointer 2c instructs a predetermined physical quantity of the vehicle according to each rotational position. Here, for example, the vehicle speed and the engine speed are adopted as the physical quantities to be indicated by the hands 2c.

  The digital display unit 2 a includes a dot matrix type display module 10 formed by arranging a plurality of pixels, and realizes image display on a rectangular screen 16 a of the display module 10. The display module 10 of the present embodiment employs a TFT liquid crystal panel, and displays an image in color by driving each constituent pixel of the screen 16a. Here, the image displayed on the screen 16a is to notify the vehicle information necessary for driving the vehicle by fixing or switching the type thereof. Examples of such vehicle information include fuel consumption, cooling water temperature, shift Range, road traffic information, warning information, etc. will be adopted.

  The control unit 4 is mainly composed of a microcomputer, and is electrically connected to the digital display unit 2a and the analog display unit 2b, and outputs a control signal to the digital display unit 2a and the analog display unit 2b.

  The display module 10, the circuit board 20, and the holding frame 30 included in the vehicular display device 100 will be described in detail with reference to FIGS.

  As shown in FIGS. 1 to 7, the display module 10 is a module that displays vehicle information, and includes a drive circuit 12, a backlight 14, and a liquid crystal display panel 16, and is covered with a holding frame 30. ing. The drive circuit 12 drives the display module 10 based on a signal from the control unit 4 and controls the display state. As shown in FIG. 5, the backlight 14 is formed in a panel shape inside the display module 10, and emits light toward the liquid crystal display panel 16 based on a signal from the drive circuit 12.

  The liquid crystal display panel 16 is a TFT liquid crystal panel that forms an image by transmitting part of the light from the backlight 14, and is a dot matrix type formed from a plurality of liquid crystal pixels arranged in a two-dimensional direction. It is a liquid crystal panel. The liquid crystal display panel 16 is formed so as to form an image by controlling the polarization direction of light from the backlight 14 in a predetermined direction based on a drive signal from the drive circuit 12. For this reason, when the relative position of the liquid crystal display panel 16 with respect to the backlight 14 is shifted or the liquid crystal display panel 16 is deformed, the formed image is changed, and the visibility of the display is hindered. In addition, since the liquid crystal display panel 16 portion of the display module 10 is exposed from the opening 33 of the holding frame 30, the display module 10 can display an image through the screen 16a as described above.

  As shown in FIGS. 7 and 8, the circuit board 20 is disposed on the opposite side of the display board 3 with the display module 10 interposed therebetween, and is formed in a plate shape by a synthetic resin such as glass epoxy resin. A plurality of circuit elements 4 a for controlling display are mounted on the circuit board 20. The control unit 4 is composed of these circuit elements 4a such as a microcomputer, a capacitor, and a pattern. The control unit 4 and the display module 10 are connected by a cable 5.

  As shown in FIGS. 2 to 9, the holding frame 30 is formed in a complicated shape by processing a metal plate such as iron or aluminum with a press or the like. Specifically, the holding frame 30 integrally includes a main body portion 32 and four fastening plate portions 35a, 35b, 35c, and 35d.

  The main body 32 is a part of the holding frame 30 that covers the display module 10. The main body portion 32 of the holding frame 30 has an opening 33 that exposes the liquid crystal display panel 16 portion of the display module 10 on the side opposite to the fastening plate portions 35a to 35d.

  Each fastening plate part 35a-d is formed in the plate shape which protrudes in L shape from four places on the opposite side to the opening 33 of the main-body part 32, respectively. Specifically, each of the fastening plate portions 35a to 35d has a bent portion 36 that protrudes from the connection portion with the main body portion 32 toward the circuit board 20 substantially perpendicularly to the circuit board 20 and bends at the tip thereof. ing. Each of the fastening plate portions 35 a to 35 d further protrudes along the circuit board 20 outward from the main body portion 32, and has a washer portion 37 and a protrusion 38 at the protruding portion.

  Due to the L-shaped protrusion through the bent portion 36 that bends between the main body portion 32 and the washer portion 37, a mounting space is provided between the main body portion 32 and the circuit board 20, as shown in FIG. 70 is formed. In the mounting space 70, a part of the circuit element 4a constituting the control unit 4 is arranged.

  Moreover, each fastening plate part 35a-d has the rib 39 which reinforces the bending part 36. As shown in FIG. The rib 39 is bridged from the main body portion 32 side to the washer portion 37 side with the bent portion 36 interposed therebetween.

  The washer portion 37 is recessed toward the side opposite to the circuit board 20. More specifically, the washer part 37 is opposite to the circuit board 20 as a whole by a planar flat part 37a and an inclined part 37b inclined toward the circuit board 20 with respect to the flat part 37a on the outer periphery of the flat part 37a. Recessed to the side. A through hole 37c through which the screw 50 is passed is formed in the center of the flat portion 37a. Further, in the washer portion 37, a plurality of slits 37d communicating with the through holes 37c are formed around the screw 50. In addition, in the fastening plate portions 35 a, 35 c, and 35 d, the washer portion 37 is disposed at the protruding tip that is the outermost side with respect to the main body portion 32.

  In particular, in the present embodiment, the plurality of slits 37d are formed at four positions with respect to the through hole 37c, and are arranged around the screw 50 at substantially equal intervals. Each slit 37d reaches the inclined portion 37b from the flat portion 37a. The four slits 37d are arranged around the screw 50 so as to coincide with the direction along the outward projecting direction and the direction substantially perpendicular to the projecting direction.

  A plurality of protrusions 38 are provided around the washer portion 37 and protrude toward the circuit board 20 side. In each fastening plate portion 35 a to 35 d, each projection 38 is disposed along the outer peripheral edge of the washer portion 37.

  As shown in FIG. 4, in particular, in the fastening plate portion 35 a of this embodiment, four projections 38 are provided in the same number as the number of slits 37 d. A plurality of (for example, four) protrusions 38 are arranged around the screw 50 at substantially equal intervals. A plurality of (for example, four) slits 37 d and protrusions 38 are alternately arranged around the screw 50. The fastening plate portion 35b has the same arrangement as the fastening plate portion 35a.

  In the fastening plate portion 35c, three protrusions 38 are provided for the four slits 37d due to space problems. The three protrusions 38 of the fastening plate portion 35c are arranged around the screw 50 so as not to overlap the slit 37d.

  In the fastening plate portion 35d, two projections 38 are provided for the four slits 37d due to space problems. The two protrusions 38 of the fastening plate portion 35d are arranged around the screw 50 so as not to overlap with the slit 37d.

  Each protrusion 38 of the fastening plate portions 35a to 35d is formed in a hemispherical shape having a radius that is approximately the same as the thickness of each fastening plate portion 35a to 35d (that is, the diameter is larger than the plate thickness). In d, the protrusion heights are aligned. Each protrusion 38 is formed by stamping from a metal plate forming the fastening plate portions 35a to 35d.

  As shown in FIGS. 6 to 8, the screw 50 is inserted from the holding frame 30 side (that is, the fastening plate portions 35 a to d side) toward the circuit board 20 side, and the planar seat surface 50 a is the flat surface of the washer portion 37. It comes in contact with the portion 37a. The washer portion 37 is elastically deformed by being fastened to the screw 50. The screw 50 fastens the fastening plate portions 35 a to 35 d to the circuit board 20 outside the main body portion 32. The screw 50 also fastens the lower case 60 disposed on the opposite side of the circuit board 20 with respect to the fastening plate portions 35a to 35d.

  In this way, the holding frame 30 holds the display module 10 and fastens it to the circuit board 20 and the lower case 60.

(Function and effect)
The operational effects of the present embodiment described above will be described below.

  According to the present embodiment, in the fastening plate portions 35 a to 35 d formed integrally with the main body portion 32 in the holding frame 30, the washer portion 37 in which the through hole 37 c through which the screw 50 is passed is formed with the circuit board 20. Is recessed toward the other side. Thereby, the washer part 37 fastened with the screw 50 is elastically deformed, so that the fastening force of the screw 50 to the circuit board 20 can be increased. Even when the circuit board 20 is twisted or warped due to vibration or heat of the vehicle or the like, the force is absorbed by the elasticity of the washer portion 37. As described above, the display module 10 can be prevented from being deformed due to twisting or warping being transmitted to the main body portion 32 integral with the fastening plate portions 35a to 35d, so that it is possible to suppress troubles in display visibility.

  Further, according to the present embodiment, the washer portion 37 fastened with the screw 50 is elastically deformed while narrowing the width of the plurality of slits 37d formed around the screw 50 and communicating with the through hole 37c, thereby increasing the fastening force. The twist or warp of the circuit board 20 can be absorbed. Accordingly, the display module 10 can be prevented from being deformed by twisting or warping being transmitted to the main body portion 32 integral with the fastening plate portions 35a to 35d, so that it is possible to suppress troubles in display visibility.

  Further, according to the present embodiment, the plurality of slits 37d are arranged around the screw 50 at equal intervals. According to this, it is possible to fasten the fastening plates 35a to 35d to the circuit board 20 in a stable state by dispersing the fastening force around the screw 50 with little deviation. Accordingly, the display module 10 can be prevented from being deformed by twisting or warping being transmitted to the main body portion 32 integral with the fastening plate portions 35a to 35d, so that it is possible to suppress troubles in display visibility.

  Further, according to the present embodiment, the flat surface portion 37a through which the screw 50 is passed reaches the inclined portion 37b inclined toward the circuit board 20 with respect to the flat surface portion 37a. Thus, at the time of fastening, the inclined portion 37b is elastically deformed, so that the fastening force can be increased and the fastening plate portions 35a to 35d can be reliably fastened to the circuit board 20. Accordingly, the display module 10 can be prevented from being deformed by twisting or warping being transmitted to the main body portion 32 integral with the fastening plate portions 35a to 35d, so that it is possible to suppress troubles in display visibility.

  According to the present embodiment, the plurality of protrusions 38 protrude toward the circuit board 20 side around the washer portion 37 in the fastening plate portions 35a to 35d. According to this, since the tightening force received by the washer portion 37 is concentrated on each projection 38, the projection 38 can be reliably pressed against the circuit board 20. Even if the circuit board 20 is twisted or warped, the reaction force of the protrusion is absorbed by the washer portion 37. As described above, it is possible to suppress the display module 10 from being deformed, and thus it is possible to suppress an obstacle to display visibility.

  According to the present embodiment, a plurality of slits 37d and protrusions 38 are alternately arranged around the screw 50 in the fastening plate portions 35a and 35b. According to this, since the fastening force acting between the slits 37d in the washer portion 37 can be concentrated on the corresponding projections 38 between the same slits 37d, the fastening plate portions 35a and 35b can be connected to the circuit in a stable state. It can be fastened to the substrate 20. Even if the circuit board 20 is twisted or warped, the reaction force of the protrusion 38 is absorbed by the washer portion 37. As described above, it is possible to suppress the display module 10 from being deformed, and thus it is possible to suppress an obstacle to display visibility.

  Further, according to the present embodiment, the plurality of protrusions 38 are arranged along the outer peripheral edge of the washer portion 37 that is recessed toward the side opposite to the circuit board 20. Even if the circuit board 20 is twisted or warped, the reaction force of the protrusion 38 is easily transmitted to the washer portion 37 and is absorbed by the washer portion 37. As described above, it is possible to suppress the display module 10 from being deformed, and thus it is possible to suppress an obstacle to display visibility.

  Further, according to the present embodiment, the plurality of protrusions 38 are arranged around the screw 50 at equal intervals in the fastening plate portions 35a and 35b. According to this, it is possible to fasten the fastening plate portions 35a and 35b to the circuit board 20 in a stable state while suppressing the bias of the tightening force concentrated on each protrusion 38. Even if the circuit board 20 is twisted or warped, the reaction force of the protrusion 38 is absorbed by the washer portion 37. As described above, it is possible to suppress the display module 10 from being deformed, and thus it is possible to suppress an obstacle to display visibility.

  In addition, according to the present embodiment, the fastening plate portions 35 a to 35 d have the bent portion 36 that is bent between the main body portion 32 and the washer portion 37, and the rib 39 that reinforces the bent portion 36. The fastening plate portions 35a to 35d can maintain the rigidity of the holding frame 30 on the main body portion 32 side of the bent portion 36 while absorbing the stress on the washer portion 37 side of the bent portion 36 by the rib 39. it can. Accordingly, the display module 10 can be prevented from being deformed by twisting or warping being transmitted to the main body portion 32 integral with the fastening plate portions 35a to 35d, so that it is possible to suppress troubles in display visibility.

(Other embodiments)
Although one embodiment of the present invention has been described above, the present invention is not construed as being limited to the embodiment, and can be applied to various embodiments without departing from the gist of the present invention. it can.

  Specifically, as a first modification, as long as the washer portion 37 is tightened by the screw 50 and elastically deformed, the plurality of slits 37 d may not be formed in the washer portion 37. As a second modification, the slits 37d may be arranged around the screw 50 at unequal intervals. Moreover, as the modification 3, the slit 37d may be formed only in the plane part 37a.

  As a fourth modification, the fastening plate portions 35 a to 35 d may not have the plurality of protrusions 38. As a fifth modification, the plurality of protrusions 38 may be disposed at a location away from the outer peripheral edge of the washer portion 37. As a sixth modification, the protrusion 38 may be formed by welding or bonding a separate member.

  As a modified example 7, the fastening plate portions 35 a to 35 d may not have the rib 39.

  DESCRIPTION OF SYMBOLS 100 Display apparatus for vehicles, 4a Circuit element, 10 Display module, 20 Circuit board, 30 Holding frame, 32 Main part, 33 Opening, 35a-d Fastening plate part, 36 Bending part, 37 Washer part, 37a Plane part, 37b Inclined part, 37c through hole, 37d slit, 38 protrusion, 39 rib

Claims (9)

A vehicle display device for displaying vehicle information,
A display module (10) for performing the display;
A circuit board (20) on which a circuit element (4a) for controlling the display is mounted;
A holding frame (30) having an opening (33) for exposing the display module and holding the display module and fastening the display module to the circuit board;
The holding frame integrally includes a main body portion (32) and fastening plate portions (35a, 35b, 35c, 35d) that are fastened to the circuit board by screws (50) outside the main body portion. ,
The fastening plate portion is recessed toward the opposite side of the circuit board, has a through hole (37c) through which the screw is passed, and has a washer portion (37) that is tightened by the screw and elastically deformed. A display device for vehicles.   2. The vehicle display device according to claim 1, wherein a plurality of slits (37 d) communicating with the through hole are formed around the screw in the washer portion.   The vehicle display device according to claim 2, wherein the plurality of slits are arranged at equal intervals around the screw. The washer part includes a planar flat part (37a) through which the screw is passed, and an inclined part (37b) inclined to the circuit board side with respect to the flat part,
Have
The vehicle display device according to claim 2, wherein the slit reaches the inclined portion from the flat portion.   5. The vehicle display according to claim 1, wherein the fastening plate portion has a plurality of protrusions (38) protruding toward the circuit board side around the washer portion. 6. apparatus. The fastening plate portion (35a, 35b) has a plurality of protrusions (38) protruding toward the circuit board side around the washer portion,
5. The vehicle display device according to claim 2, wherein a plurality of the slits and the protrusions are alternately arranged around the screw.   The vehicle display device according to claim 5, wherein the plurality of protrusions are arranged along an outer peripheral edge of the washer portion.   The vehicle display device according to claim 5, wherein the plurality of protrusions are arranged at equal intervals around the screw.   The said fastening plate part has the bending part (36) bent between the said main-body part and the said washer part, and the rib (39) which reinforces the said bending part, It is characterized by the above-mentioned. The vehicle display device according to any one of 1 to 8.

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