JP6153078B2 - Vehicle display device - Google Patents

Description

  The present invention relates to a vehicular display device that allows an information image to be visually recognized as a virtual image through a transmissive reflector by irradiating light to a transmissive reflector (projector) that transmits and reflects light such as a windshield of a vehicle.

  A conventional vehicle display device is disclosed in Patent Document 1, for example. In this vehicle display device, a lower case constituting the case by assembling the upper case, a display attached to the lower case and emitting display light, and display light emitted from the display are guided. The optical path and the circuit board provided with the display drive circuit are provided, and the circuit board is assembled in a storage space between the light guide path in the lower case and the bottom surface of the lower case, thereby reducing the size. .

JP 2013-124038 A

  In the structure of the display device according to Patent Document 1, since the circuit board is arranged in the space of the optical path, the glossy green resist applied to the surface of a general circuit board and the mounted electronic component May reflect light (display light or external light emitted from the outside), generate stray light unrelated to the display light, and reduce the display quality of the displayed image.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compact vehicular display device that improves display quality by suppressing generation of unnecessary stray light.

  To achieve the above object, a vehicle display device according to a first aspect of the present invention includes a display that emits display light, a reflective member that reflects the display light, and an electronic component that controls the display. A circuit board, an electrical connector provided on the circuit board, a wiring member connected to the electrical connector, and a housing for storing them, wherein at least a part of the circuit board has the region It faces the optical path through which the display light travels, and the circuit board has a low reflection portion having a low reflectance in the partial region.

  In the vehicular display device according to a second aspect of the present invention, the circuit board does not mount the electronic component on a surface having the low reflection portion.

  In the vehicular display device according to a third aspect of the present invention, the circuit board has the electrical connector mounted on a surface that does not have the low reflection portion, and the wiring member is irradiated from the optical path. It arrange | positions so that light may be shielded, It is characterized by the above-mentioned.

  The vehicle display device according to a fourth aspect of the present invention further includes an actuator that drives the reflecting member, and the circuit board is disposed between the display and the actuator, and the circuit board and the actuator A wiring member for connecting to the display unit and a wiring member for connecting the circuit board and the actuator are disposed so as to shield light from the optical path.

  The vehicle display device according to a fifth aspect of the present invention is characterized in that the low reflection portion is formed by applying a black resist to the circuit board.

  In the vehicular display device according to a sixth aspect of the present invention, the circuit board is disposed on a back surface of the reflection member, and the low reflection portion is provided at least in a region exposed from the reflection member. Features.

  ADVANTAGE OF THE INVENTION According to this invention, display quality can be improved by suppressing generation | occurrence | production of an unnecessary stray light, and a compact vehicle display apparatus can be provided.

It is a schematic sectional drawing for demonstrating the structure of the HUD apparatus which concerns on one Embodiment of this invention. It is a disassembled perspective view of the HUD device concerning the above-mentioned embodiment.

  A HUD device according to an embodiment of the present invention will be described with reference to the drawings.

  The HUD device 100 is mounted on, for example, an automobile. As shown in FIG. 1 and the like, the housing 10, the display device 20, the plane mirror 30, the concave mirror 40, the actuator 50, and the low reflection circuit substrate 60. And comprising.

  The HUD device 100 reflects the display light L representing the display image M displayed by the display device 20 with the plane mirror 30 and the concave mirror 40, and irradiates the windshield 200 of the vehicle on which the HUD device 100 is mounted for display. The contents displayed by the HUD device 100 in this way are various vehicle information, navigation information, and the like.

  The housing 10 is composed of, for example, an upper case 11 formed of a synthetic resin in black and a lower case 12. By engaging the upper case 11 and the lower case 12, the plane mirror 30, the concave mirror 40, and the actuator 50 are formed. The low reflection circuit board 60 is housed inside, and the display device 20 is attached to the outside.

  The upper case 11 has an opening 11a that allows display light L to be described later to pass through the windshield 200 at a portion facing the windshield 200, and the opening 11a is covered with a translucent cover 11b. Further, the upper case 11 has a light shielding wall 11c at a location near the plane mirror 30 of the opening 11a, and external light incident from the opening 11a (the translucent cover 11b) is directed to the plane mirror 30 side or the display 20 side. Prevent progress. Further, the upper case 11 finely textures at least a region facing an optical path S described later. With such a configuration, generation of stray light due to light reflected from the optical path S being reflected by the upper case 11 can be suppressed.

  The lower case 12 has a plane mirror 30, a concave mirror 40, an actuator 50, a low-reflection circuit board 60, and an engaging portion (not shown) that engages the indicator 20 attached to the outside, which are housed inside the housing 10. Then, the display 20, the plane mirror 30, the concave mirror 40, the actuator 50, the low reflection circuit board 60, and the like are positioned and fixed. The lower case 12 includes a display port 12a that is opened so that the display image M displayed on the display 20 faces the plane mirror 30 side, and a wiring member 70b that is connected to the display 20 from the low reflection circuit board 60 described later. 70c has wiring holes 12b and 12c through which they pass. Moreover, although not shown in figure, the lower case 12 also has a wiring hole through which a wiring for supplying various signals such as image information and power from the vehicle side to the low reflection circuit board 60 described later is inserted.

  The display 20 emits display light L representing a display image M for notifying predetermined information (various vehicle information, navigation information, etc.). For example, a liquid crystal panel (not shown) and a light source for backlight It is comprised from the transmissive liquid crystal display comprised from (not shown). The display 20 has a heat sink 20a that releases heat of the light source for backlight to the outside. The heat sink 20a and the display 20 are respectively attached to the engaging portions of the lower case 12. In addition, the display 20 is connected to a wiring member 70b and a wiring member 70c from a low reflection circuit board 60, which will be described later, and the backlight light source emits desired light in accordance with an electrical signal and power supply from the wiring member 70b. The liquid crystal panel emits and displays a desired display image M on the display surface in accordance with the electrical signal and power supply from the wiring member 70c.

  The plane mirror 30 reflects the display light L emitted from the display device 20 toward the concave mirror 40.

  The concave mirror 40 is formed by forming a reflective film on the surface of a base material made of, for example, a synthetic resin material by means such as vapor deposition. The concave mirror 40 further reflects the display light L reflected by the plane mirror 30 and emits it toward the windshield 200. To do. The display light L reflected by the concave mirror 40 passes through the translucent cover 11 b provided in the opening 11 a of the housing 10 and travels toward the windshield 200. The display light L that reaches and is reflected on the windshield 200 forms a virtual image (display image visually recognized by the observer E) V of the display image M at a position in front of the windshield 200. As a result, the HUD device 100 allows the observer E (mainly the driver of the vehicle) to visually recognize both the virtual image V and the outside scene that actually exists in front of the windshield 200. In addition, the concave mirror 40 has a function as a magnifying glass, and magnifies the display image M displayed on the display device 20 and reflects it to the windshield 200 side. That is, the virtual image V visually recognized by the observer E is an enlarged image of the display image M displayed by the display device 20.

  The actuator 50 includes a motor (not shown), a power transmission member (not shown) such as a gear that transmits the power of the motor to the concave mirror 40, and a support base (not shown) that supports the motor, the power transmission member, and the concave mirror 40. And the concave mirror 40 is rotated around the rotation axis AX. The motor generates power for rotating the concave mirror 40 around the rotation axis AX, and includes, for example, a stepping motor. The motor is connected to a wiring member 70a from a low reflection circuit board 60, which will be described later, and rotates the motor according to an electrical signal and power supply from the wiring member 70a, and the power transmission member transmits power to the concave mirror 40. The concave mirror 40 is rotated around the rotation axis AX.

  The low reflection circuit board 60 includes a circuit board 61 on which electronic components are mounted on one side, and a low reflection portion 62 formed on a surface of the circuit board 61 on which electronic components are not mounted. It is attached to the part (not shown). When the low reflection circuit board 60 is fixed to the lower case 12 with a screw, it is fixed with a black non-glossy screw. As shown in FIG. 1, one end of the low-reflection circuit board 60 extends to the actuator 50 side with respect to the lower end portion 40 a of the concave mirror 40, and the other end is arranged so as to substantially contact the display port 12 a of the lower case 12. Established. The lower end portion 40a of the concave mirror 40 here refers to the counterclockwise (CCW) counterclockwise rotation (CCW) in FIG. 1 with the rotation axis AX as the center for practical use when the concave mirror 40 is rotated. The lower end when letting go. Further, the plane of the low reflection circuit board 60 is disposed so as to be substantially parallel to the optical axis of the display light L reflected from the plane mirror 30 to the concave mirror 40.

  The circuit board 61 has a predetermined wiring pattern formed on one side of a hard insulating substrate, and passive components (electronic components) such as resistors, capacitors, and coils, and active components (electronic components) such as control ICs and semiconductor components. And connection parts (electronic parts) such as electrical connectors (63a, 63b, 63c) are mounted on the electrode portions of the wiring pattern. The circuit board 61 is electrically connected to the motor of the actuator 50, the backlight light source of the display 20, and the liquid crystal panel by wiring members 70a, 70b, and 70c, and is connected to an external device (illustrated) such as a vehicle ECU (Electronic Control Unit). No) is obtained from the vehicle status information transmitted through the communication line, and the display 20 is driven accordingly. Further, the HUD device 100 is provided with input means (not shown) for a user such as the observer E to adjust the angle of the concave mirror 40 (this input means is electrically connected to the circuit board 61). The controller may drive the actuator (motor) 50 according to the operation content from the input means of the user and set the rotation axis of the actuator 50 by a predetermined angle. Rotate. Thereby, the concave mirror 40 can be rotated around the rotation axis AX. The insulating substrate of the circuit board 61 is preferably a resin substrate such as FR-4 or a ceramic substrate having excellent heat resistance.

  The low reflection portion 62 is, for example, a black resist having a low reflectance, and is formed by applying the surface of the circuit board 61 on which the electronic component is not mounted. The low reflection part 62 is surrounded by the display surface of the display 20, the plane mirror 30, the concave mirror 40, and a part of the upper case 11 (including the translucent cover 11b), and is a space in which the display light L travels. It is disposed on the circuit board 61 so as to face a certain optical path S. The low reflection portion 62 may be formed by attaching a seal member having a low reflectivity or printing an ink having a low reflectivity, and the base material itself of the circuit board 61 may have a low reflectivity. You may comprise by forming with what has. Moreover, you may comprise with the black resin material etc. which have a low reflectance.

  The wiring member 70 is constituted by, for example, an electric wire in which a conductive wire is covered with an insulating member, a flexible flat cable (FFC), or the like. The wiring member 70 electrically connects the circuit board 61 and the display 20 and the circuit board 61 and the actuator 50, Electric power is supplied to the display 20 and the actuator 50. In FIG. 1, the wiring member 70a connects the electrical connector 63a on the circuit board 61 and the actuator 50, the electrical connectors 63b and 63c on the circuit board 61, and the display 20 (light source for backlight, liquid crystal panel). Are connected to the wiring members 70b and 70c.

  In the HUD device (vehicle display device) 100 described above, at least a part of the circuit board 61 faces the optical path S along which the display light L travels, and the circuit board 61 has a part of the area. With such a configuration, the circuit board 61 is irradiated with light (display light L or external light emitted from the outside) traveling through the optical path S. Light is not reflected by the circuit board 61, the generation of stray light is suppressed, the display quality of the virtual image V visually recognized by the observer E is improved, and the circuit board 61 is arranged in the housing 10 to be compact. A head-up display device can be provided.

  Further, the circuit board 61 does not mount an electronic component on the surface having the low reflection part 62, and stray light can be prevented from being generated by the light traveling through the optical path S being reflected by the electronic component.

  In addition, the circuit board 61 is arranged so that the electrical connector 63 is mounted on a surface that does not have the low reflection portion 62 and shields the light from the optical path S irradiated on the wiring member 70. With such a configuration, stray light can be prevented from being generated by the light traveling through the optical path S being reflected by the electrical connector 63.

  The circuit board 61 is provided between the display device 20 and the actuator 50, and includes electrical connectors 63 b and 63 c that connect the circuit board 61 and the display device 20. The optical connector 63a that connects the circuit board 61 and the actuator 50 is disposed so as to shield light from the optical path S. With such a configuration, light traveling through the optical path S can be transmitted. It is possible to prevent stray light from being reflected by the electrical connectors 63a, 63b, and 63c connected to the display device 20 and the actuator 50, and to realize a short and compact wiring of the electrical connector 63.

  Further, the low reflection portion 62 is formed by applying a black resist to the circuit board 61. With such a configuration, a new member is not provided by the resist covering the wiring pattern of the circuit board 61. Also, the low reflection portion 62 can be formed.

  Further, the circuit board 61 is disposed on the back surface of the plane mirror 30, and the low reflection portion 62 is provided at least in a region exposed from the plane mirror 30, and the region where the low reflection portion 62 is provided can be kept low.

  In addition, this invention is not limited by the said embodiment and drawing. Of course, changes (including deletion of components) can be added to these.

  In the above description, the lower case 12 is an engaging portion (illustrated) that engages the plane mirror 30, the concave mirror 40, the actuator 50, the low reflection circuit board 60, and the display device 20 that is attached to the outside. Not), but is not limited to this. An intermediate case may be provided in the housing 10, an engaging portion of the above member may be provided in the intermediate case, and the intermediate case may be attached to the housing 10. Further, instead of attaching the display device 20 to the outside of the housing 10, the display device 20 may be disposed inside the housing 10 so that the heat sink 20 a is exposed to the outside of the housing 10.

  In the above description, the display device 20 is composed of a liquid crystal panel and a light source for backlight. However, the display device 20 may be anything that can display the display image M, and the light source and the light emitted from the light source. May be used, and a reflective spatial light modulator that displays the display image M on the screen may be used, and various known displays can be applied.

  Further, in the above description, the display light L is reflected back to the concave mirror 40 by the plane mirror 30, but the plane mirror 30 is omitted, and the display light L emitted from the display device 20 is directly irradiated to the concave mirror 40. It may be.

  In the above description, the electronic component is mounted on only one side of the circuit board 61. However, the electronic component may be mounted on both sides, minimizing electrode portions (lands) and vias as much as possible, and reducing the low reflection portion. Since 62 covers the electrode portions, vias, and electronic components, stray light can be prevented from being generated by the light traveling through the optical path S being reflected by the electronic components and electrodes.

  Further, a blind member (not shown) formed by embossing a resin material or the like may be provided in a partial region where a large amount of external light is irradiated between the circuit board 61 and the optical path S. Thus, it is possible to suppress deterioration of the circuit board 61 and temperature rise due to external light while suppressing stray light.

  Further, the circuit board 61 is constituted by a build-up board, the electronic component is mounted on the optical path S side, the electrode portion and the electronic component are covered with the low reflection portion 62, and the electronic component of the circuit board 61 is not mounted. By eliminating the surface-side casing 10, a more compact head-up display device can be provided.

  In the above description, the circuit board 61 is composed of a single board. However, the circuit board 61 may be divided into a plurality of boards. The circuit board 61 that controls the display device 20 and the circuit board that controls the actuator 50 may be used. 61 may be provided. With such a configuration, there is no need to provide a large circuit board 61, and a compact head-up display device can be provided. Further, by bringing the plurality of circuit boards 61 close to each other, it is possible to prevent stray light from being generated due to light traveling in the optical path S passing between the plurality of circuit boards 61.

  Moreover, in the above description, although the example which the display light L reflected with the concave mirror 40 is projected on the windshield 200 was shown, it is not restricted to this. The display light L reflected by the concave mirror 40 may be projected onto a transmission / reflection member (so-called combiner) dedicated to the HUD device 100.

  In the above description, in order to facilitate the understanding of the present invention, the description of known unimportant technical matters is appropriately omitted.

100 HUD device, 10 housing, 11 upper case, 11a opening, 11b translucent cover, 11c light shielding wall, 12 lower case, 12a display port, 12b, 12c wiring hole, 20 display, 30 plane mirror (reflective member) 40, concave mirror (reflective member), 50 actuator, 60 low reflection circuit board, 61 circuit board, 62 low reflection part, 63 (63a, 63b, 63c) electrical connector, 70 (70a, 70b, 70c) wiring member, E observation Person, M display image, L display light, S optical path, V virtual image, AX axis of rotation

Claims (6)

A display that emits display light, a reflective member that reflects the display light, a circuit board on which electronic components that control the display are mounted, an electrical connector provided on the circuit board, and a connection to the electrical connector Wiring members to be provided, and a housing for storing them,
At least a part of the area of the circuit board faces an optical path through which the display light travels, and the circuit board has a low reflection portion having a low reflectance in the part of the area. Display device for a vehicle.   The vehicle display device according to claim 1, wherein the circuit board does not mount the electronic component on a surface having the low reflection portion.   The circuit board is disposed so as to shield the light from the optical path irradiated on the wiring member by mounting the electrical connector on a surface not having the low reflection portion. The vehicle display device according to claim 1 or 2. An actuator for driving the reflecting member;
The circuit board is disposed between the display and the actuator, and irradiates a wiring member that connects the circuit board and the display, and a wiring member that connects the circuit board and the actuator. The vehicle display device according to claim 1, wherein the vehicle display device is disposed so as to shield light from the optical path.   The vehicle display device according to claim 1, wherein the low reflection portion is formed by applying a black resist to the circuit board. The circuit board is disposed on the back surface of the reflecting member,
The vehicle display device according to claim 1, wherein the low reflection portion is provided at least in a region exposed from the reflection member.

Images