JP2776861B2 - In-vehicle information reception and display device - Google Patents

Description

The present invention relates to a device for displaying road traffic information and the like in a vehicle.

[Conventional technology]

A system for transmitting traffic information such as traffic congestion and other information in the form of a code or a text message to a driver using digital communication is being studied. In this system, traffic information is supposed to be transmitted to the driver in the form of characters or graphics on an electronic display device (for example, a CRT). JP-A-63-136828 is an example of such a system.

[Problems to be solved by the invention]

In the above prior art, a dedicated display is assumed, but if there is another video device such as a television in the vehicle, a plurality of displays will be installed. However, it is often difficult to install a plurality of indicators in a narrow cabin, and the economy is poor.

Therefore, it is conceivable that the display is shared with, for example, a television. However, there is a drawback that operations such as switching a switch are troublesome.

The present invention has been made in view of the above points, and has as its object to provide an in-vehicle information display device that shares a display with other video equipment and has good operability.

[Means for solving the problem]

The above object is to provide a setting unit for setting whether or not to display information on a display unit shared with another video device, a selection unit for selectively selecting an input signal of the display unit, and a power supply for the display unit. Is off and when the required information is received,
Means for turning on the display unit according to a setting state of the setting means, and a display signal of the required information to the selecting means according to the setting state of the setting means when receiving required information. A second input means, and cyclically cancels and recalls the information display according to the input state of the second input means. Is done.

[Action]

The operator turns on a switch (alternative means may be used) in advance, for example, as a display of intention that traffic information is required.
When the traffic information is received or the content is updated, the control device cuts off the signal of another video device and displays the traffic information. If the power of the display is not turned on, the power is turned on. When the operator instructs to stop displaying the traffic information, for example, by pressing a switch for canceling the display, the display returns to the original state. By pressing the same switch again, the previous information is called and displayed again.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows an example of sharing with a television (TV). Hereinafter, the description will be made assuming that the display information is traffic information. antenna
The television signal received at 31 is received by the tuner 4 and displayed on the display 7 via the video switch 50. When watching the television, power is supplied to the tuner 4 and the display 7 by a system different from that shown in the figure.

On the other hand, traffic information is received by the antenna 30 and demodulated by the receiver 2. If the traffic information is multiplexed and transmitted on the radio wave of the television, the antenna 30 and the receiver 2 can use a television receiver.

The data demodulated by the receiver 2 is taken in by the control circuit 1, converted into a signal form suitable for the display 7, and output to the switch 50. The control circuit 1 reads the states of the display switch 60 and the display on / off switch 61 and responds accordingly.
The video switch 50 and the power switch 51 are controlled. A power supply 8 is connected to the power switch 51 so that power can be supplied to the display 7.

The control circuit 1 can be realized, for example, by a circuit having a configuration as shown in FIG. The overall control is performed by a central processing unit (CPU) 10 that operates according to a program stored in a read-only memory (ROM) 12. The received data is stored in a read / write memory (RAM) by an interface circuit (I / F) 11 and edited. The I / F 11 has a function of detecting data in a certain format, communicating with the CPU 10, and transferring the data, although the I / F 11 differs depending on the communication system. When the information in a bundle is received, the CPU 10 displays the RAM 16 for display.
Transfer information to The display control circuit 15 forms and outputs a display signal based on the information in the RAM 16.

The output of switch 61 is pulled up to resistor R1,
Input as a 0 interrupt signal. That is, each time the switch 61 is depressed, an interrupt occurs. switch
61 interrupts can be masked by software.
The switch 60 is also pulled up by the resistor R0, and is input as 1-bit data through the input / output port (I / O) 14 to the CPU 10.
Can be read. The control signals of the switches 50 and 51 are also output via the I / O 14.

Next, the operation will be described with reference to FIG. Fig. 3 (a)
5 is an operation flowchart of the CPU 10. After the start, initialization is performed in step A. For example, the display flap FLAG is set to 0, the switch 51 is turned off, and the switch 50 is set to the TV tuner 4 side. Next, in step B, the receiving operation is started. In step C, the state of the switch 60 is read. If the switch 60 is on, the interrupt mask is cleared (step D1), and the interrupt by the displayed recall / clear switch 61 is enabled. If the switch 60 is off, set the interrupt mask (step D
0), interrupts by the switch 61 are disabled. Next, in step E, it is tested whether reception of one block of data has been completed. Upon completion, the process proceeds to the next step F.
However, if there is no need to display even if the same information is sent, the determination function may be incorporated in step E. Further, in step F, the state of the switch 60 is verified again to determine whether display is necessary. If not, repeat from step B. If necessary, in step G, the switch 50 is controlled so that the signal from the control circuit 1 is output to the display 7. Since the power of the display 7 may not be turned on, the switch 51 is turned on in step H to supply power to the display. Finally,
In step I, a variable FLAG on the software indicating that it is being displayed is set, and the process returns to step B.

As described above, the display is made when the switch 60 is turned on and the required information is received. However, the display needs to be erased or displayed again. This process is based on an interrupt process. The processing flow is shown in FIG. This process starts when the switch 61 is pressed while the interrupt mask in the CPU 10 is cleared. First, it is determined in step J whether information is currently being displayed. If FLAG is 1, control is performed to turn off the display and return to the original state. At step K1, FLAG is cleared, and at step L1, the switch 51 is turned off. In step M1, tuner 4
Switch to the side to end the interrupt processing. If the processing returns to the original state by the processing of K1 to M1 and the user watches the television, the user can continue to watch the television.

Conversely, if FLAG is 0, recall display of previously displayed information is performed. In step K0, set FLAG to 1,
In step L0, the switch 51 is turned on, and in step M0, the switch 50 is switched to the control circuit 1 side to display information.

[Effects of the Invention] According to the present invention, when required information is received only by turning on the switch, the information is displayed on the display unit, and the display on the display unit is returned to the original state by one switch operation. And can be displayed again, so that operability is improved.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram illustrating an embodiment of the present invention,
FIG. 2 is a diagram illustrating an example of the control circuit 1 in FIG. 1, and FIGS. 3 (a) and 3 (b) are flowcharts illustrating the operation of the control circuit 1. Description of reference numerals 1 ... Control circuit 2 ... Receiver 50,51,60,61 ... Switch 7 ... Display

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G08G 1/00-1/16 H04B 1/16

Claims (1)

(57) [Claims] 1. A setting means (60) for setting whether or not to display information on a display unit (7) shared with another video equipment, and alternatively selecting an input signal of the display unit (7). Selecting means (50) for turning on the display unit (7) according to the setting state of the setting unit (60) when the power of the display unit (7) is off and when required information is received. Means (51, 1) for turning on, and means for causing the selecting means (50) to select a display signal of the required information according to a setting state of the setting means (60) when required information is received. (1) An in-vehicle information receiving and displaying device comprising: (2) a second input means (61), wherein information display cancellation and recall are cyclically performed according to an input state of the second input means (61). A vehicle-mounted information receiving and displaying device.