JP2022114592A - Vehicle display device - Google Patents

Abstract

To provide a vehicle display device which can facilitate the change of a device to be mounted.SOLUTION: A vehicle display device comprises: a plurality of devices 21-25 which include display units 21 for displaying images; a communication interface 10 which inputs a drive signal from a master system D and transmits the signal to each of the devices 21-25; and a non-volatile memory 20 which stores first address information specifying each of the devices 21-25 and second address information with a value different from the first address information and corresponding to a program of the master system D in association with each other.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle display device, and is suitable as a vehicle display device that performs display output based on a signal from another unit, for example.

2. Description of the Related Art Various communication interface methods have been proposed and standardized for display devices that involve communication between a plurality of systems. In particular, there is a communication interface composed of a master system and a slave system. For example, it is disclosed in Patent Document 1.

In a display device configured as a slave system in this communication interface, the device can be controlled from the master system side using the address of each device in the display device. For example, when driving a vehicular display device equipped with an image display panel, the address information, video information, and display timing information assigned to the device of the image display panel are transmitted from the master system to the vehicular display device serving as a slave system. This can be achieved by transferring to

JP 2014-35289 A

According to the above configuration, it is necessary for the master system side to store in advance the addresses of the devices on the slave system side. However, when a specific device is discontinued and obsolete, it is necessary to update the address information (program data) on the master system side when changing the device, which makes the change difficult.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a display device for a vehicle that can easily change the device by paying attention to the above-mentioned problems.

The vehicle display device of the present invention includes:
a plurality of devices including displays for displaying images;
A communication interface that inputs drive signals from the master system and sends them to each device,
a non-volatile memory that associates and stores first address information specifying each of the devices and second address information that corresponds to the program of the master system and has a value different from the first address information; Prepare.

Also, the communication interface outputs the first address information stored in the nonvolatile memory to the master system side.

Further, the non-volatile memory stores the first and second address information and function parameter information of the corresponding device in association with each other.

Also, a driving signal including image data and a first address for the display is input from the master system, and the image data is output to the display.

The vehicular display device of the present invention is a vehicular display device that facilitates device change.

The figure which shows the vehicle-mounted example of the vehicle meter of this embodiment. The block diagram which shows the structure of the vehicle instrument of the same embodiment. The figure showing the storage content of the non-volatile memory 20 of the same embodiment. FIG. 4 is a diagram showing an example of communication between the master system of the embodiment and a vehicle instrument;

An embodiment to which the vehicle display device of the present invention is applied will be described below with reference to the accompanying drawings.

A vehicle display device is a display device for displaying an image, and will be described by taking as an example a device to which the vehicle meter A shown in FIG. 1 is applied. In addition, as the vehicle display device, a head-up display (not shown), a center display B that also serves as a navigation system and an air conditioner, a monitor C for displaying images outside the vehicle, etc. are mounted on the instrument panel and dashboard of the vehicle V. A display device can also be applied.

A vehicle instrument (vehicle display device) A is connected to an in-vehicle master system D, as shown in FIG. In the master system D, various programs stored in the nonvolatile memory D1 are used to perform arithmetic processing by the arithmetic unit D2, and the communication interface D3 is used to send a communication signal to the vehicle instrument A, which is one of the slave systems. Send and receive.

The vehicle instrument A has a communication interface 10 similar to the communication interface D3 of the master system D, exchanges data by encoding/decoding serial data, and can perform two-way communication. In this case, a connection for performing so-called I2C communication is established between the master system D and the slave system.

In addition to the non-volatile memory 20, the vehicle instrument A includes a display 21 that displays images using a liquid crystal display element, an organic EL display element, or the like, and a backlight LED 22 with a dimming function for the display 21. , indicator LEDs 23 that display by transilluminating the design plate on which the symbol mark is printed, speaker 24 for ringing and voice guidance at the time of alarm, etc., backlight brightness of the display 21 are adjusted optimally. Therefore, various devices such as an illuminance sensor 25 for measuring the illuminance of the external environment are provided in the same housing. In this case, these devices include components necessary for driving various drivers and transistors for on/off switches.

First address information for I2C is assigned to the various devices 20 to 25, and based on this first address information, the master system D identifies a drive target and transmits a drive signal, or transmits a drive signal. You can identify devices and receive signals.

On the other hand, the nonvolatile memory 20 can be, for example, an EEPROM, and as shown in FIG. 3, first address information (device address) is stored at each address of the nonvolatile memory 20 as a data value. In addition, the nonvolatile memory 20 associates the second address information set for each of the devices (plural devices) 21 to 25 with a value different from the first address information as a device ID with the first address information. Stored.

It should be noted that the second address information is set in advance by a program of the master system D to determine the device type. With these data tables, it is possible to manage the IDs of the devices 21 to 25 of the vehicle instrument A that communicate with the master system.

The nonvolatile memory 20 also stores device-specific parameters in association with the second address information. For example, it is possible to store data such as display size information and illuminance sensor specific characteristic values as parameter information.

By accessing the nonvolatile memory 20, the master system D can read the first address information for accessing the device actually mounted in the vehicle instrument A based on the second address information. .

An example of drive control from the master system D to the device 1 (display) will be described with reference to FIG. The master system D accesses the EEPROM (non-volatile memory 20) via the communication interfaces D3 and 10, and uses the second address information (predetermined address "0x0001") indicating the device 1 grasped in advance. , the corresponding first address information is read and stored in the storage unit in the master system D. FIG. Thereafter, a drive signal for driving and controlling the device 1 is issued using the first address information, and the device 1 drives based on the drive signal and transmits a response signal to the master system D.

Through the communication between the master system D and the vehicle instrument A described above, the first address information can be confirmed using the second address information even if the master system D does not know the first address information in advance.

Therefore, even if the device in the vehicle instrument A is changed, it is only necessary to change the configuration in the vehicle instrument A including the table data in the nonvolatile memory 20. Therefore, the program data of the master system D does not need to be changed. Therefore, when the devices 21 to 25 in the vehicle instrument A are changed, only the change in the vehicle instrument A is required. In this case, the second address information of the nonvolatile memory 20 is not changed, but the corresponding first address information and parameter data are changed.

In addition, if it can be determined in advance that the program needs to be changed due to the change of the device (change of the first address information), the device-specific parameter data can also be confirmed, so that the master system D can perform program operations corresponding to the device.

In addition, the communication processing for confirming the first address information corresponding to the plurality of devices 21 to 25 in the vehicle instrument A by the master system D can be collectively performed in advance. The first address information can be collectively read from the non-volatile memory 20 and stored in the storage unit of the master system D (for example, the non-volatile memory D1) at the timing when the activation switch V1 of the vehicle V is actuated. By confirming the second address information before normal operation such as when the vehicle V is running, the communication load and computational load for driving the devices 21 to 25 of the vehicle instrument A can be reduced. It works.

In addition, it is possible to assume that the above-mentioned device changes may occur when parts are changed depending on the destination region of the vehicle or the vehicle instrument, when variations in instrument specifications are met, when parts are discontinued, and so on.

Such a vehicle instrument A includes a plurality of devices 21 to 25 including a display 21 that displays an image, a communication interface 10 that inputs a drive signal from the master system D and transmits it to each device 21 to 25, and a device 21 to 25, and second address information corresponding to the program of the master system D and having a value different from the first address information are stored in association with each other. , provided.

Therefore, it becomes the vehicle instrument A which can easily change the device corresponding to the master system D. FIG.

Further, the communication interface 10 outputs the first address information stored in the nonvolatile memory 20 to the master system D side, and the nonvolatile memory 20 outputs the first and second address information. By further storing the function parameter information of the device in association with it, the vehicle instrument A can be improved in flexibility of changing the device.

Further, even if a drive signal including image data and a first address for the display device 21 is input from the master system D, and the image data is output to the display device 21, the same effect as described above can be obtained. .

Although the configuration of the embodiment in which the vehicle display device of the present invention is applied to the vehicle instrument A described above has been described as an example, the present invention is not limited to this, and other configurations may be used. It goes without saying that various improvements and display changes are possible without departing from the scope of the present invention. For example, in the above-described embodiments, a display panel type using a liquid crystal display element, an organic EL display element, or the like is shown as a display. A so-called projector type that generates and projects display light including an image by using a laser beam scanning MEMS mirror or the like may be used, and the same effect as the above-described embodiment can be obtained.

INDUSTRIAL APPLICABILITY The present invention relates to a display device for a vehicle, and is suitable as a display device that is mounted on a moving body equipped with, for example, an automobile, a motorcycle, or an agricultural machine or a construction machine, and displays vehicle information, route guidance, road information, and the like.

A vehicle instrument (vehicle display device)
10 communication interface 20 non-volatile memory 21 indicator 22 backlight LED
23 indicator LED
24 speaker 25 illuminance sensor

D Master system D1 Non-volatile memory D2 Operation part D3 Communication interface

Claims (4)

a plurality of devices including displays for displaying images;
A communication interface that inputs drive signals from the master system and sends them to each device,
a non-volatile memory that associates and stores first address information specifying each of the devices and second address information that corresponds to the program of the master system and has a value different from the first address information;
A display device for a vehicle. 2. The vehicle display device according to claim 1, wherein the communication interface outputs the first address information stored in the nonvolatile memory to the master system side. 2. The vehicle display device according to claim 1, wherein said non-volatile memory stores said first and second address information and function parameter information of corresponding devices in association with each other. 2. The vehicle display device according to claim 1, wherein a drive signal including image data and a first address for said display is input from said master system, and said image data is output to said display.

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