Display device for vehicle

Abstract

To provide a display device for a vehicle having improved heat dissipation.SOLUTION: According to this disclosure, a display device 1 for a vehicle is a display device 1 for a vehicle mounted on a vehicle C to display information on the vehicle C and includes an indicator 2 for displaying the information, an internal circuit 32 including a control part 33 for controlling the indicator 2, a circuit board 3 for mounting the internal circuit 32, a first connector 41 mounted on the circuit board 3 to receive power from the vehicle C by being electrically connected to the vehicle C, and a second connector 42 mounted on the circuit board 3 to receive the power from the vehicle C by being electrically connected to the vehicle C.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a display device for a vehicle. [Background technology]

[0002] Patent Document 1 discloses a vehicle display device including a circuit board (20) on which a connector (27) is mounted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-10884 Summary of the Invention [Problem to be solved by the invention]

[0004] Even with the configuration disclosed in Patent Document 1, there is still a need for improvement in heat dissipation.

[0005] An object of the present disclosure is to provide a vehicle display device with improved heat dissipation properties by focusing on the above-mentioned problems. [Means for solving the problem]

[0006] In order to achieve the above object, the vehicle display device according to the present disclosure includes: A vehicle display device mounted on a vehicle and displaying information about the vehicle, a display that displays the information; an internal circuit including a control unit that controls the display; a circuit board on which the internal circuit is mounted; a first connector mounted on the circuit board and electrically connected to the vehicle to receive power from the vehicle; a second connector mounted on the circuit board and electrically connected to the vehicle to receive power from the vehicle; Equipped with. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram showing the appearance of a vehicle display device 1 according to an embodiment of the present disclosure. [Figure 2] 3 is a diagram showing the appearance and wiring of a circuit board 3. FIG. [Figure 3] 3 is a diagram showing the appearance and wiring of a circuit board 300. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, examples of embodiments and modifications of a display device according to the present disclosure that are mounted on a vehicle will be described in the following order with reference to the accompanying drawings. [First embodiment] 1-1.Configuration explanation 1-2.Examples of effects [Variations]

[0009] [First embodiment] <1-1. Description of the configuration> As shown in FIG. 1 , the vehicular display device 1 is mounted on a vehicle C. The vehicle C can be, for example, an agricultural machine, a construction machine, or other agricultural or construction machinery, or a passenger vehicle, such as a four-wheeled vehicle or a two-wheeled vehicle. The vehicular display device 1 is electrically connected to various electrical components mounted on the vehicle C and performs signal communication. The electrical components are, for example, a system related to vehicle driving (such as a powertrain), a communication device, a display device other than the vehicular display device 1 (such as an infotainment system), and a power source (such as a battery). The vehicular display device 1 notifies the occupant of the vehicle C of various information (such as vehicle information and entertainment information) by displaying images or the like in response to signals input from the electrical components connected to it.

[0010] The vehicle display device 1 includes a display unit 2, a circuit board 3, and a case 4 that houses them. The case 4 is made of a dark, rigid synthetic resin (such as ABS or PP). The case 4 houses the display unit 2 in a state where the display surface of the display unit 2 is visible from outside the vehicle display device 1. The case 4 houses the circuit board 3 in a state where it cannot be seen from outside.

[0011] The display device 2 displays images under the control of the control unit 33, which will be described later. By displaying images, the display device 2 notifies various pieces of information to the occupants of the vehicle C. The display device 2 is configured, for example, with a TFT liquid crystal display module, but various other display configurations (a configuration using an electronic display panel such as an organic EL display, or a configuration using a projector) can also be applied.

[0012] 3, the circuit board 3 is a printed wiring board on which various electric and electronic elements are mounted. The circuit board 3 includes a substrate 31, an internal circuit 32, a power supply direct drive circuit 34, a first connector 41, a power line 41p, a ground line 41g, a second connector 42, a power line 42p, a ground line 42g, noise elimination circuits 51 and 52, diodes 61 and 62, a first signal line 71, and a second signal line 72.

[0013] The substrate 31 is a flat base material on which electric and electronic elements can be mounted, and for example, a glass epoxy substrate can be used.

[0014] The internal circuit 32 includes control circuits (such as the control unit 33), power supply circuits (such as transformer elements), drive circuits (such as LED drivers), and communication circuits (such as CAN transceivers), and operates based on power supplied from outside the circuit board 3, and performs predetermined operations related to controlling the display of the display device 2 and controlling electrical components.

[0015] The control unit 33 is composed of a microcomputer equipped with a storage unit, a calculation unit, etc., and performs calculations based on signals input from external electrical components and image information stored in the storage unit to generate an image to be displayed on the display device 2. The control unit 33 also transmits a control signal to the display device 2 to display the generated image.

[0016] The direct power supply circuit 34 is a circuit that operates by receiving a direct supply of electric power from a battery mounted on the vehicle C, and specifically includes, for example, switches and lighting fixtures (warning lights, headlights, etc.). In particular, it is desirable that the switches be used for operations related to vehicle-specific information, which will be described later. If the power supply direct drive circuit 34 is connected only via the second connector 42, then if the circuit board 3 is used to design another vehicle model, it can be easily reused by making changes mainly to the parts related to the second connector 42, without changing the parts related to the first connector 41.

[0017] The first connector 41 and the second connector 42 are connection portions for electrically connecting electrical components mounted on the vehicle C to the circuit board 3. Each connector is formed of a plurality of pins that are electrically connected to a copper foil pattern formed on the board 31 and a cover portion formed to surround the pins. The pins include power lines 41p and 42p and ground lines 41g and 42g. The power lines 41p and 42p transmit power required for the operation of the vehicle display device 1 and the operation of the electrical components driven by the vehicle display device 1 from a battery mounted on the vehicle C. The ground lines 41g and 42g are connected to the ground of the vehicle C and are normally maintained at ground potential (0 V). Note that, for example, one power line 41p and 42p and one ground line 41g and 42g are provided for each connector, but multiple lines may be provided.

[0018] The noise elimination circuits 51, 52 are provided between the internal circuit 32 and the first connector 41, and between the internal circuit 32 and the second connector 42, respectively, and are provided to connect the power lines 41p, 42p to the ground lines 41g, 42g. The noise elimination circuits 51, 52 are circuits that eliminate noise applied from these lines. For example, a power Zener diode or the like can be applied.

[0019] Diodes 61 and 62 are connected to prevent current from flowing in the reverse direction so that internal circuit 32 is not destroyed when the anode and cathode of the battery are connected in reverse (so-called reverse connection of the power supply occurs).

[0020] The first signal line 71 and the second signal line 72 are wirings that transmit electrical signals received from the vehicle C to the internal circuit 32 via the first connector 41 and the second connector 42. These electrical signals may include information that forms the basis of an image displayed on the display device 2.

[0021] Specifically, the first signal line 71 may transmit an electrical signal related to driving information of vehicle C, and the second signal line 72 may transmit an electrical signal related to information specific to the vehicle model of vehicle C (vehicle model specific information).

[0022] The driving information includes, for example, the operating state of the power source (engine speed, battery output, etc.). Vehicle-specific information refers to information that is specifically required depending on the vehicle type, such as agricultural machinery such as a farm machine, combine harvester, or rice planter, or construction machinery such as a hydraulic excavator, wheel loader, or crane. For example, vehicle-specific information for a rice planter includes information about rice planting, and vehicle-specific information for a hydraulic excavator includes information about the excavator's position and information about excavation work.

[0023] By configuring it in this manner, for example, when designing another vehicle model based on the circuit board 3 of the present disclosure, it is possible to easily reuse parts of the circuit board 3 by reusing the circuit related to the first connector 41, which is used for general driving-related communications for the vehicle, while concentrating on changing the design of the circuit related to the second connector 42, whose required functions vary depending on the vehicle model.

[0024] Although one first signal line 71 and one second signal line 72 are provided for each connector in this example, a plurality of lines may be provided.

[0025] The holes 80 are provided so that the circuit board 3 can be fixed to the case 4 with fixing members such as screws.

[0026] <1-2. Example of effect> (1) The vehicle display device 1 of the present disclosure includes: A vehicle display device 1 mounted on a vehicle C and displaying information about the vehicle C, a display 2 for displaying information; an internal circuit 32 including a control unit 33 that controls the display device 2; a circuit board 3 on which an internal circuit 32 is mounted; a first connector 41 mounted on the circuit board 3 and electrically connected to the vehicle C to receive power from the vehicle C; a second connector 42 mounted on the circuit board 3 and electrically connected to the vehicle C to receive power from the vehicle C; Equipped with.

[0027] According to this configuration, while conventional vehicle display devices have generally been configured to receive power from vehicle C via a single connector, by receiving power via multiple connectors, the power lines 41p, 42p, which tend to generate heat, can be spaced apart, thereby improving heat dissipation.

[0028] (2) The vehicle display device 1 of the present disclosure includes: The power supply further includes a noise removal circuit connected in parallel or series between the first connector 41 and the internal circuit 32, and between the second connector 42 and the internal circuit 32, for reducing noise in the power supplied from the vehicle C.

[0029] According to this configuration, the connectors can be arranged farther apart than when the noise removal circuits of the connectors mounted on the vehicle display device 1 are shared, thereby improving heat dissipation.

[0030] (3) The vehicle display device 1 of the present disclosure includes: In addition to the internal circuit 32, a direct-actuated power supply circuit 34 is further provided, which operates by receiving electric power. The internal circuit 32 is supplied with power from the first connector 41, The direct current power supply circuit 34 is supplied with power only from the second connector 42 .

[0031] According to this configuration, when the circuit board 3 is used in a vehicle other than vehicle C, the configuration of the internal circuit 32, which is the main circuit other than the power supply direct drive circuit 34, can be maintained while the design of the part related to the second connector 42 can be easily changed.

[0032] (4) The vehicle display device 1 of the present disclosure includes: The power supply direct drive circuit 34 is located outside the first connector 41 and the second connector 42 within the plane formed by the circuit board 3.

[0033] According to this configuration, by increasing the distance between the power supply direct drive circuit 34 and the internal circuit 32, even if noise is applied to the power supply direct drive circuit 34 which is directly connected to the battery of the vehicle C, the impact on the internal circuit 32 can be reduced.

[0034] (5) The vehicle display device 1 of the present disclosure includes: The first connector 41 has a first signal line 71 electrically connected to the vehicle C, The second connector 42 has a second signal line 72 electrically connected to the vehicle C, The first signal line 71 carries out communication regarding the driving information of the vehicle C, The second signal line 72 carries out communication relating to vehicle type specific information of the vehicle C.

[0035] According to this configuration, the design of the circuit board 3 can be easily changed or partially reused, resulting in a display device for a vehicle with excellent design.

[0036] (6) The vehicle display device 1 of the present disclosure includes: The first connector 41 and the second connector 42 have the same contact resistance.

[0037] This configuration allows for uniform current flow and heat generation per pin. This makes heat resistance design relatively easy, resulting in a vehicle display device with excellent design. Note that the contact resistance referred to here refers to the contact resistance that occurs between the pins included in the first connector 41 and the second connector 42 and the contact points of the connected wiring.

[0038] (7) The vehicle display device 1 of the present disclosure includes: Each of the first connector 41 and the second connector 42 is configured with a plurality of pins, and the power lines 41p and 42p and the ground lines 41g and 42g are assigned to pins that are not adjacent to each other.

[0039] This configuration increases the distance between the power lines 41p and 42p and the ground lines 41g and 42g, which tend to generate heat, and spreads the heat distribution, thereby reducing the maximum temperature within the heat generation range.

[0040] [Variations] Although the vehicle display device of the present invention has been described using the configuration of the above-mentioned embodiment as an example, the present invention is not limited to this, and it goes without saying that various improvements and changes to the display are possible in other configurations as long as they do not deviate from the gist of the present invention.

[0041] For example, in the first embodiment, the circuit board 3 has the second signal line 72 and the second connector 42 supplies power to the internal circuit 32. However, the vehicle display device may be configured as shown in FIG. 3. FIG. 3 shows a circuit board 300 mounted on the vehicle display device. Compared to the circuit board 3, the second signal line 72 is omitted from the circuit board 300. Furthermore, in the circuit board 300, the second connector 42 does not supply power to the internal circuit 32, but only to the power supply direct drive circuit 34. Even with this configuration, it is possible to obtain a circuit board that improves heat dissipation while facilitating partial reuse.

[0042] Although the configuration in which the noise elimination circuits 51 and 52 are connected in parallel to the internal circuit 32 has been shown, the noise elimination circuits may also be connected in series to the internal circuit 32. In either case, however, it is desirable that the noise elimination circuits be located between each connector and the internal circuit. Although the noise removal circuit has been shown to have a configuration in which a power Zener diode is applied, a surge absorbing diode, a varistor, or the like may also be used.

[0043] An example has been given in which the vehicle-specific information is information specific to the type of vehicle, but the vehicle-specific information may also be information about accessories that may or may not be installed depending on the grade of the vehicle, even for the same vehicle. [Explanation of symbols]

[0044] C vehicle 1. Vehicle display device 2 Display 3 Circuit Board 31 PCB 32 Internal circuit 33 Control Unit 34 Direct-acting power supply circuit 41 First Connector 41p Power Line 41g ground line 42 Second Connector 42p Power Line 42g ground line 51,52 Noise elimination circuit 61,62 Diode 71 First signal line 72 Second signal line 80 holes 4 cases

Claims

1. A vehicle display device mounted on a vehicle and displaying information about the vehicle, a display that displays the information; an internal circuit including a control unit that controls the display; a circuit board on which the internal circuit is mounted; a first connector mounted on the circuit board and electrically connected to the vehicle to receive power from the vehicle; a second connector mounted on the circuit board and electrically connected to the vehicle to receive the power from the vehicle; Equipped with Vehicle display device.

2. The power supply further includes a noise elimination circuit connected in parallel or in series between the first connector and the internal circuit, and between the second connector and the internal circuit, for reducing noise in the power. The vehicle display device according to claim 1 .

3. a power supply direct drive circuit that operates by receiving the power, separate from the internal circuit; the internal circuit receives the power from the first connector; The direct power supply circuit is supplied with the power only from the second connector. The vehicle display device according to claim 1 .

4. The power supply direct drive circuit is located outside the first connector and the second connector within a plane defined by the circuit board. The vehicle display device according to claim 3 .

5. the first connector has a first signal line electrically connected to the vehicle; the second connector has a second signal line electrically connected to the vehicle, the first signal line is used for communication regarding vehicle driving information, The second signal line is used for communication regarding vehicle type specific information of the vehicle. The vehicle display device according to claim 1 .

6. The first connector and the second connector have the same contact resistance. The vehicle display device according to claim 1 .

7. Each of the first connector and the second connector is configured with a plurality of pins, and the pins of the power line and the ground line are not adjacent to each other. The vehicle display device according to claim 1 .

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