JPH02186500A - On-vehicle information reception display device - Google Patents

Abstract

PURPOSE:To automatically correspond to information reception and the change of contents by providing a means to control the power source of a display part, means to alternatively select the input signal of the display part and bit input means to set whether information are displayed or not and turning-on the power source in correspondence to the specified state of a bit when the information are received. CONSTITUTION:In order to execute initialization just after start, a flag for display is set zero, a switch 51 is turned off and a switch 50 is changed over to a TV tuner 4 side. Next, when reception operation is started, the state of a switch 60 is read. When the switch 60 is turned on, an interruption mask is cleared and interruption by a recall/clear switch 61 of the display is made available. When the switch 60 is turned off, the interruption mask is set and the interruption by the switch 61 is made impossible. After that, it is tested whether the reception of the data for one block is completed or not. When the reception is completed, the state of the switch 60 is checked again and the presence and absence of necessity to display the data is decided. When it is necessary to display the data, a signal on the control circuit 1 side is displayed on a display 7 by the control of the switch 50.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for displaying road traffic information etc. in a vehicle.

[Conventional technology]

A system is being considered that uses digital communication to convey traffic information such as traffic jams and other information to drivers in the form of codes or text messages.
This system is designed to convey traffic information to the driver in the form of text or graphics on an electronic display device (eg CRT). An example of such a system is Japanese Patent Application Laid-Open No. 65-456828. [Problem to be Solved by the Invention] In the above-mentioned prior art, a dedicated display is assumed;
If you have other video equipment such as a TV in your car, you will need to install multiple displays. However, it is often difficult to install a plurality of display devices in a narrow single room, and it is also less economical.

Therefore, it is conceivable to share the display with, for example, a television, but this has the drawback that operations such as switching switches are cumbersome.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a vehicle-mounted information display device that can share a display with other video equipment and is easy to operate.

[Means to solve the problem]

In order to achieve the above object, when information is received or when the information content is changed, other video signals are automatically interrupted and the information is displayed.

[Effect]

For example, the operator turns on a switch (an alternative method may be used) as an indication of his/her intention to require traffic information. When the traffic information is received or its contents are updated, the control device cuts off the signals of other video equipment and displays the traffic information. If the display unit is not powered on, turn it on. When the operator instructs to cancel the display of traffic information by pressing the display cancel switch, the display returns to its original state. Also, by pressing the same switch again, the previous information will be recalled and displayed again.

〔Example〕

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

On the other hand, the traffic information is received by the antenna 30 and demodulated by the receiver 2. If the traffic information is multiplexed with TV radio waves and sent, the antenna 30 and receiver 2 are reception section can be used.

The data demodulated by the receiver 2 is input to the control circuit IK, 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 display on/off switch 61 and controls the video switch 50 and power switch 51 accordingly.

A power source 8 is connected to the power switch 51 so that power can be supplied to the display 7.

The control circuit 1 is a central processing unit that operates according to a program stored in a read-only memory (ROM) 12, which can be realized, for example, by a circuit configured as shown in FIG.
(Cpu)+oK, which controls the entire system, is stored in a read/write memory (RAM) and edited by an interface circuit (I/F) 11. The I/F 11 has a function of detecting data in a certain format, contacting the CPU 10, and passing the data, although this varies depending on the communication system. When the complete information has been received, the CPU 10 transfers the information to the RAM 16 for display.The 0 display control circuit 15 forms and outputs a favorite display signal based on the information in the RAM 16.

The output of switch 61 is pulled up to resistor R1, and c
Input as puto interrupt signal ◎ That is,
An interrupt occurs every time switch 61 is pressed down.

The interrupt of switch 61 can be masked by software. The switch 60 can also be read into the CPU 10 as 1-bit data via the input/output capacitor (Ilo) t4, which is firmly attached by the resistor RO. The control signals for the switches so, st are also output via Ilo+4.

Next, the operation will be explained using FIG. Figure 3(a) is
This is an operation flowchart of CPU10. In the step after the start, initialization is performed in the hair.

For example, the display flag FLAG is set to oKL, the switch 51 is turned off, and the switch 50 is set to the TV tuner 4 side. Next, in step B, a reception 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 to enable interrupts by the display recall/clear switch 61 (step D1). If the switch 60 is off,
Set the interrupt mask (step DO), switch 6
11C interrupts are disabled. Next step E
Test whether one block of data has been received in the IC. Once completed, proceed to the next step F. However, if there is no need to display only one display even if the same information is sent, the determination function can be incorporated into step E. Furthermore, in step F, the state of the switch 60 is verified again,
Determine whether display is necessary. If you don't need it,
From step B, turn back. 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. In some cases, the display unit 7 is not powered on, so in step H, switch 5 is turned on.
Turn on 1 to supply power to the display. Finally, in step 1.

Set the variable FL^G on the software to indicate that it is being displayed, and return to step B.

As described above, when the switch 60 is turned on and the desired information is received, the display is displayed, but it is necessary to erase the display and display the sensitivity. This processing is performed by interrupt processing.

The processing flow is shown in FIG. 3 (1)). This process is C
It starts when the switch 61 is pressed while the interrupt mask inside PU10 is cleared. First, in step J, it is determined whether information is currently being displayed. If FLAG is 1, control is performed to erase the display and return to the original state. At step j[1) C, FI and AG are cleared, and at step L1, switch 51 is cleared.
Turn off.

In step M1, the switch is switched to the chainer 41ii1, and the interrupt processing ends. 1~M for above
If you have been watching TV, you can continue watching it by returning to the original state by performing step 1.

Conversely, if FLAG is 0, the previously displayed information will be recalled. In step KO, FLAG is set to 1, the switch 51 is turned on in step L, and the switch 5o is switched to the control circuit 1 side in step MO to display information.

〔Effect of the invention〕

According to the present invention, when information is received by simply turning on the switch, the display can be automatically switched and displayed. This improves operability.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram illustrating an embodiment of the present invention;
FIG. 2 is a diagram for explaining an example of the control circuit 1 in FIG. 1, and FIGS. 5(a) and 3(1)) are flowcharts for explaining the operation of the control circuit 1. Explanation of symbols 1...Control circuit 2...Receiver 50, 51.60. 61...Switch 7...
Display diagram cb>

Claims (1)

[Claims] 1. In an on-vehicle information receiving and display device that shares a display unit with other video equipment, means for controlling the power supply of the display unit and selectively controlling an input signal to the display unit. and a bit input means for setting whether or not to display information, and when information is received, the display unit is powered on and the information is displayed in response to a specific state of the bit. An in-vehicle information receiving and display device. 2. The in-vehicle information reception display according to claim 1, further comprising a second bit input means, and cyclically making an information display cancellation call in response to a change in the state of the second bit. Device.