JPH1062196A - Display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a display device by which a processing burden on the side of a navigation apparatus is not increased when the guidance of a route is image-displayed at the front of a vehicle. SOLUTION: A transparent EL display 2 is arranged at the front of a combination meter 1. When the guidance of a route is image-displayed, a navigation apparatus outputs an external signal which contains a code signal indicating its image display. An EL-display control circuit 3 comprises a ROM in which image data corresponding to the code signal is stored in advance. When it receives the external signal from the navigation apparatus, it reads out the image data from the ROM on the basis of the code signal which is contained in the external signal, and the guidance of the route is image-displayed on the transparent EL display 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular display device for displaying an image of route guidance in navigation, for example, on the front of a meter in an instrument.

[0002]

2. Description of the Related Art Conventionally, various navigation devices have been proposed which detect a current position of a vehicle, display a map near the current position, and perform route guidance display for the destination when the destination is set. In this apparatus, a navigation display device for displaying a map or route guidance is arranged on a center console or the like. When the route guidance display is performed, the direction to travel and the distance to the intersection are displayed on the route to the destination in front of a predetermined distance such as an intersection.

However, when a map or route guidance display is displayed on a center console or the like, there is a problem that the display is difficult to see from the driver's seat. In addition, when a driver of a vehicle needs information about navigation during traveling, the driver needs a route guidance display rather than a map. Therefore, it is conceivable to provide a display device for route guidance in front of the driver's seat, for example, in an instrument panel, so that the route guidance display can be easily viewed.

In this case, if a video signal for route guidance display is sent from the navigation device to the route guidance display device, it takes a long time to send the video signal. There is a problem that the burden increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent a processing load on the navigation device from increasing when displaying route guidance in front of a vehicle. .

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a display means (2) for displaying a route guidance image in front of a driver's seat of a vehicle,
A code signal indicating a route guidance image display is output from the navigation device (10), and the display control means (3) reads out image data corresponding to the code signal from the storage means (33) by using the code signal. The present invention is characterized in that the display means displays a route guidance image.

[0007] Therefore, since a code signal indicating the image display of the route guidance may be output from the navigation device, the image of the route guidance can be displayed in front of the vehicle without increasing the processing load on the navigation device side. it can. According to the second aspect of the present invention, when the navigation device outputs a character code for displaying additional information related to the route guidance image display in characters, the route guidance image display can be performed. Additional information such as intersection names can be added.

[0008] As the display means in front of the driver's seat of the vehicle, a transparent EL display disposed in front of a vehicle information display section for displaying information on the vehicle on an instrument panel as in the invention according to claim 3. Vessel (2). By using such a transparent EL display, route guidance display can be performed without requiring a dedicated space.

In this case, if the display brightness of the vehicle information display section on the back of the transparent EL display is reduced, the display of the transparent EL display becomes clear. be able to. It should be noted that reducing the display brightness of the vehicle information display includes a case where the vehicle information display requires a lighting device such as a lamp to turn off the lighting device.

[0010]

FIG. 1 shows the overall configuration of a vehicular display device according to an embodiment of the present invention. The combination meter 1 is installed on an instrument panel, and has a vehicle speed meter, a tachometer, a water temperature gauge, a fuel gauge, and the like. The combination meter 1 is a self-luminous meter, in which a pointer (pointer) and a dial of the meter constantly emit light day and night by a lighting means such as a fluorescent tube, an LED, and a lamp.

On the front face of the combination meter 1, a transparent EL display 2 as a sub-display is provided so as to be superimposed on the display of the tachometer and the fuel gauge.
The transparent EL display 2 is configured so that the scanning electrodes and the data electrodes intersect and perform matrix display, and perform image display of route guidance in navigation and the like. E
The L display control circuit 3 is electrically connected to the transparent EL display 2 via the flexible print plate 2a, and causes the transparent EL display 2 to perform route guidance image display by an external signal from the navigation device 10.

In the navigation device 10, a navigation main body 11 includes a vehicle speed signal from a vehicle speed sensor 12,
The current position of the vehicle is calculated based on the direction signal from the direction sensor 13 and the current position signal from the GPS 14.
When a destination is set to 5, a route guidance calculation process for the destination is executed. Then, the map information recording medium (C
Based on the map information from the D-ROM 16, a map including the current location of the vehicle is displayed on the map display device 17, and at the time of performing route guidance, the location of a point requiring a course change such as an intersection on the route to the destination is determined. When the vehicle reaches a predetermined distance before, a direction to be advanced is displayed as an image. The route guidance may be performed by voice instead of the route guidance image display. Such a map and route guidance are the same as the conventional one.

When displaying the image of the route guidance, the navigation body 11 controls the EL display by using a code signal indicating the image display and a character code (JIS code or ASCII code) of the intersection name as an external signal. Transmit to the circuit 3. FIG. 2 shows the configuration of the EL display control circuit 3.
Shown in The external signal transmitted from the navigation body 11 is input to the CPU 32 via the line driver IC 31. The CPU 32 reads the contents of a specific area of the ROM 33 in which image data for displaying an image is stored in advance and transfers the read contents to the frame memory 34 according to the reception code included in the external signal. That is, as shown in FIG. 3, the ROM 33 stores image data for performing route guidance such as a right-turn screen and a left-turn screen in an area designated by each address. Then, the image data is transferred to the frame memory 34 by designating the address to be used.

The ROM 33 stores fonts for displaying characters by character codes.
When a character code is included in the external signal, the CPU 32 causes a character display corresponding to the character code to be performed using the font stored in the ROM 33. The fonts may be stored in a dedicated kanji ROM instead of the ROM 33.

The CPU 32 includes a display controller 3
For 5, an internal register necessary for line-sequential scanning of the transparent EL display 2 at a predetermined frequency, such as a read address on the frame memory 34, is set. The display controller 35 reads data from the frame memory 34 in accordance with a read address or the like written in the internal register, causes the data driver IC 36 to output image data, and simultaneously outputs a vertical synchronization signal, a horizontal synchronization signal signal, and a dot clock signal. Is output to the timing generation circuit 37.

The timing generation circuit 37 is provided on the data side driver IC 3 based on a signal from the display controller 35.
6. Output latch signals and the like necessary for controlling the scanning driver IC 38 to the driver ICs 36 and 38. The scanning driver IC 38 is driven by using a circuit 39 for outputting a row composite signal and an isolation circuit 40 for superimposing the row composite signal and the latch signal and the like as commonly used for driving the transparent EL display 2. Do.

Further, a buzzer generating circuit 41 for informing the driver of the display by the transparent EL display 2 is provided. FIG. 4 shows a circuit for controlling the illumination of the self-luminous meter.
In the figure, a lamp 50 is used as the lighting means, and the lamp 50 is used.
Illuminates one self-luminous meter (for example, a tachometer).

The control signal S1 is a signal that goes high when the lamp 50 is turned on and goes low when the lamp 50 is turned off. The control signal S2 is a signal that goes high when the lamp 50 is dimmed and goes low when the lamp 50 is not dimmed. It is. When the control signal S1 is at the L level, the outputs of the AND circuits 51 and 52 are both at the L level.
The lamps 3 and 54 are turned off, and the lamp 50 is turned off. Also,
When the control signal S1 is at the H level and the control signal S2 is at the L level, the output of the AND circuit 51 is at the H level,
Goes low, only the transistor 53 is turned on, and the lamp 50 is turned on. When the control signal S1 is H
When the control signal S2 is at the H level, the AND circuit 5
2 becomes H level, and the output of the AND circuit 51 becomes L level by the NOT circuit 55, so that only the transistor 54 is turned on and the lamp 50 is dimmed. The resistor 56 is a current limiting resistor for dimming.

Here, when the control signal S1 is set to the H level in conjunction with the ignition switch being turned on during the operation of the vehicle, and the control signal S2 is set to the L level when no dimming is required in the daytime, the lamp 50 is turned on. Further, when the control signal S2 is set to the H level when dimming at night, the lamp 50
Is dimmed. Further, when the control signal S1 is set to the L level during the route guidance display by the arithmetic processing described later, the lamp 50 is turned off.

As shown in the figure, if the resistors 57 and 58 are inserted, when the control signal S1 becomes L level,
Instead of turning off the lamp 50, a small amount of current flows through the lamp 50 via the resistors 57 and 58, so that the lamp 50 can be dimmed. FIG. 5 shows the arithmetic processing of the CPU 32.
The CPU 32 sets the transparent EL display 2 in a non-light emitting state at the start of the arithmetic processing, so that the tachometer and the water temperature meter on the rear surface can be seen through the transparent EL display 2. Thereafter, the arithmetic processing shown in FIG. 5 is repeatedly executed.

First, in step 101, a process of receiving an external signal from the navigation device main body 11 is executed. When an external signal is received, a reception code included in the external signal is determined. For example, when the reception code is “turn right”, in step 102, the address of the ROM 33 corresponding to the reception code is designated, and the image data of the right turn is transferred to the frame memory 34. Further, the character code of the intersection name included in the external signal is converted into a font, and character display data is stored in the frame memory 34. The same processing is performed when the received code causes another image to be displayed (step 103 and the like).

In step 104, the illuminating means of the tachometer and the water temperature gauge are turned off. In this case, the control signal S1 shown in FIG. 4 is set to the L level, and the lamps and the like corresponding to the respective meters are turned off. Further, a signal is output to the buzzer generation circuit 41 to generate a buzzer for a predetermined time (step 107). In this way, the route guidance image can be displayed on the transparent EL display 2 provided at a location different from the navigation device 10. Also,
Since the buzzer sounds for a certain period of time at the same time as the display, the driver can be notified of the route guidance image display.

FIG. 6 shows an example in which a left-turn route guidance display is performed. “Sakuramachi” in the figure indicates the name of the intersection. Further, when an external signal for canceling the display of the route guidance is transmitted from the navigation main body 11, the transparent EL display 2 is turned off in step 105, and the illuminating means of the tachometer and the water temperature meter is set in step 106. Lights up. Thereby, the display state returns to the display state before the route guidance display is performed.

In this embodiment, the arithmetic processing shown in FIG. 8 is executed together with the arithmetic processing shown in FIG. First, in step 201, it is determined whether or not the vehicle is stopped based on the vehicle speed signal from the vehicle speed sensor. If it is determined that the vehicle is stopped, a message is displayed on the transparent EL display 2 in step 202. At 203, the lighting means of the tachometer and the water temperature gauge are turned off. In this case, when, for example, a seatbelt warning is issued as a message display, a seatbelt screen as shown in FIG. 8 is displayed.

When the vehicle starts running, step 2
In steps 04 and 205, the transparent EL display 2 is turned off, and the illuminating means of the tachometer and the water temperature gauge are turned on. The message display may be a message display of vehicle self-diagnosis information (water temperature, internal temperature, disconnection check of electrical wiring, etc.) other than the seat belt wearing warning display.

The stop of the vehicle may be determined by turning on the parking brake, instead of using the vehicle speed signal from the vehicle speed sensor. In the embodiment described above, the image display is performed by the combination meter 1.
Although the display performed by the transparent EL display 2 provided on the front surface of the device is shown, a liquid crystal display may be used instead of the transparent EL display 2, and the display for performing the route guidance display is provided on the hood of the instrument panel. Alternatively, a half mirror may be provided in front of the combination meter, and a route guidance display may be performed in front of the driver's seat by virtual image display by the half mirror. Further, route guidance display may be performed using a head-up display that performs display on a windshield.

Further, although the tachometer and the water temperature gauge are shown as the vehicle information display section for displaying the vehicle information, other displays may be used. May be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a vehicle display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an EL display control circuit 3.

FIG. 3 is a diagram showing a storage state of image data in a ROM 33.

FIG. 4 is a circuit diagram for performing illumination control of a self-luminous meter.

FIG. 5 is a flowchart showing a route guidance process in a CPU 32;

FIG. 6 is a diagram illustrating a display example in which a right-turn route guidance display is performed.

FIG. 7 is a flowchart illustrating a message display process in a CPU 32;

FIG. 8 is a diagram showing a display example in which a message indicating that a seat belt is worn is displayed.

[Explanation of symbols]

1 ... Combination meter, 2 ... Transparent EL display, 3
... EL display control circuit, 10 ... Navigation device, 32
... CPU, 33 ... ROM for storing image data.

Claims (4)

[Claims] 1. A navigation device (10) for performing arithmetic processing of route guidance for a destination and outputting a code signal indicating the image display when displaying an image of the route guidance. Display means (2) for displaying an image of the route guidance by means of a display, and storage means (33) for storing image data corresponding to the code signal, and when the code signal is received from the navigation device, the code is transmitted from the storage means. A display control means (3) for reading image data corresponding to the signal and causing the display means to display a route guidance image. 2. The navigation device outputs a character code indicating additional information related to the image display of the route guidance together with the code signal, and the display control means performs the route guidance by the character code. The vehicle display device according to claim 1, wherein the additional information is displayed in characters in addition to the image display. 3. The display device according to claim 1, wherein the display means is a transparent EL display (2) disposed on a front surface of a vehicle information display section for displaying information about the vehicle on an instrument panel. The display device for a vehicle as described in the above. 4. The vehicle display device according to claim 3, wherein said display control means reduces display brightness of said vehicle information display section when displaying said transparent EL display.