JPS6085688A - Display device - Google Patents

Abstract

PURPOSE:To simplify and miniaturize a structure by allowing selective repetition and indication of an image signal from plural image genenration means by a single picture display device. CONSTITUTION:The display device visually displays by operating keys on a keyboard 1 the computed result of a processor such as a personal computer, the broadcast from a television receiver 3 as well as a character broadcasting receiver 4, the reproducing image signal transmitted from a magnetic image recorder/reproducer 5 such as a video tape recorder, and the signal transmitted from an information receiver 6 called a ''videotex system'', on a screen 9 of the picture indicator or a color cathode-ray tube through a changeover circuit 16. A processing circuit 2 is connected with a memory 11 such as a printer 10 and a floppy disk, and makes it possible to compile documents, namely attains functions as a word processor by combining the circuit 2 with the keyboard 1, the processing circuit 2, the image indicator 8, the printer 10 and a storage 11.

Description

TECHNICAL FIELD The present invention relates to a display device that displays images using scanning lines or a large number of dots.

BACKGROUND ART Conventionally, display means for individually displaying images in display devices for displaying input and calculation results of personal computers, magnetic recording and reproducing devices such as television receivers and video tape recorders, etc. It is therefore complicated.

Purpose An object of the present invention is to provide a display device with a simplified configuration.

Embodiment FIG. 1 is a block diagram of an embodiment of the present invention. The keyboard 1 has keys defined by the Japanese Industrial Standard 1, and by manual operation of the keys on the keyboard 1, the performance results of a processing device such as a personal computer or the like, or the reception of a television receiver 3 or teletext broadcasting can be obtained. Broadcast content from a device 4, etc., a reproduced video signal from a magnetic recording/reproducing video device 5 such as a video tape recorder, and a signal from an information receiving device 6 called a video tex system are transmitted via a switching circuit 16. The image is visually displayed on a screen 9 of an image display device 8, which is a color cathode ray tube.

The processing circuit 2 is connected to a printer 10 and a memory 11 such as a 70-day printer, and a keyboard 1.
By using the processing circuit 2, the image display device 8, the printer 10, and the storage device 11, it is possible to achieve the function of a so-called word processor for editing sentences, and also to perform operations such as customer management, image display, and video games. can be done.

In the Videotex system, the receiving device 6 is
can be connected to the transmitting device fi1.13 via. The transmitting device 13 transmits a map stored in the memory 14;
Information such as weather forecasts is sent to the receiver m16 via the telephone line. The video signal from the receiving device 6 can be displayed by the image display device 8 as described above.

The output from the processing circuit 2 controls the operation of the switching circuit 16 via the input/output port 15. Table 1 shows the signal format of each video signal from the Videotex receiving device 6, the television receiver 3, the magnetic recording/reproducing video device 5, the processing circuit 2, and the teletext receiver 4. In Table 1, R
The GB signal indicates that the signals representing red and blue are individually included in the video signals from the video signal generating means. A composite signal indicates that it is a composite signal that combines the red, green, and old signals. The term "TTL signal" indicates that the signal is a digital value of "1" or "o".

Table 1 and FIG. 2 are electrical circuit diagrams showing a specific configuration of the switching circuit 16. This switching circuit 16 has input terminals p1 to p14.
and output terminals q1 to q13. The input terminal p has a high level when an RGB signal is input, and a low level when a composite signal is input. The signal from this input terminal p1 is clamped by a resistor R1 and is led out to an output terminal q1 via a buffer]7.

Resistors R2, R3 and a capacitor C1 are connected to the output terminal q1, and the output terminal q2. q3 is connected. This resistance J'+
't: R3 is connected to output terminal q8.

When the analog signal and RGB A, No. 1 are simultaneously input to the input terminal p2, it becomes high level and T T
It becomes low level when not waiting for simultaneous input of L signal and RGB signal. This signal from the input terminal p2 conducts the transistors Ql and Q2, and the coil 18 of the relay Ry.
, thereby energizing input terminal p4. p5. The relay switches SLl to S13 individually corresponding to pCi are made conductive, and the individual contact 19 of the relay switch S14 is switched to another individual contact 20. The input terminals p4 to p7 are then used for displaying the video signal from the receiving device 6 for the Videotex system on the image display device 8. Input terminal p4. The red, green, and blue analog signals are input to p5pp6, and the input terminal p
A synchronizing signal is input to 7. At this time, the input terminal p2 becomes high level, and therefore the outputs from the input terminals p4 to p7 are led to the output terminals q5 to q8.

Input terminals p8 to p12 are used to display the calculation results from the processing circuit 2 on the image display device 8.

Input terminals p8 to p12 receive individual red, green and blue RGB signals, and are connected to AND gates Gl, G2 . G3
is given to one input of AND gate Gl, G2.
The other power of G3 is given the collector outputs of transistors Ql and Q2. The video signal from the processing circuit 2 is
It is a TTL signal and an RGB signal, so the input terminal p2 is at a low level. Therefore, transistors Ql and Q2 are shielded from 1 to 1, and their collectors are at a high level. Thus input terminal 1) 8s
RGB signals from p9p plo are sent to output terminal q9. ql
O and qll are respectively derived.

A horizontal synchronizing signal and a vertical synchronizing signal are applied to the input terminals pH and p12, and are applied to one input of the input terminals G14 and G15. This AND game) G14. G
The other input of 15 is given the collector outputs of transistors Ql and Q2. The output of AND gate G15 is led to output terminal q12. The output of AND gate G14 is given to individual contact 19 of relay switch S14.

In addition, input terminal p14 and output terminal q1 are used for video monitor.
3 are provided. Switches 81 to S5 are provided for impedance matching.

The input terminals p4 to p7 also include a television receiver 3, a magnetic recording/reproducing video device 5, and a teletext receiver 4.
These video signals are selectively provided to the image display device 8 by a configuration (not shown) included in the switching circuit 16.

FIG. 3 shows the state displayed by the image display device 8 when the power is turned on.

Referring to FIG. 4, when the power is turned on, the process moves from step n1 to step n2, where the processing circuit 2 enters an operating state or an initial state, and in step n3, the switching circuit 16 switches the video signal having the RGB signal and TTL signal format. A switching state is set to be applied to the image display device 8, so that the image shown in FIG. 3 is displayed in step n4. Looking at the other image shown in the third figure, the operator selectively suppresses the keys PFI to PF7 provided on the keyboard 1,
This controls the operation of the switching circuit 16, making it possible to selectively view the desired video signals from the video signal generating means 2-6.

When such keys PF1 to PF7 are selectively operated, the operation shown in FIG. 5 is achieved. The process moves from step m1 to step m2, and when it is determined that the key PFI has been operated, the process moves to step m12, where the video signal from the first receiving device 6 is applied from the switching circuit 16 to the image display device 8.

In step m3, it is determined that the key PF2 has been operated, and if so, the switching circuit 16 is switched to the television receiver 3.
Alternatively, a video signal from the magnetic recording/reproducing video device 5 is given to the image display device 8 . Steps m4, m5,
Keys PF3, PF4, P in mG and m7
When F5 and PF6 are operated, the process moves to step mll, where the video signal from the processing circuit 2 is displayed on the image display device 8 via the switching circuit 16.

When the key PF7 is operated in step m8, the video signal from the teletext receiver 4 is applied to the image display device 8 via the switching circuit 16.

As another embodiment of the present invention, the image display device 8 may be a cathode ray tube as described above, or may have a configuration for displaying images by a large number of dots, or may have other configurations. It may also be a means for displaying an image erosion.

The embodiments described above can be advantageously implemented by being mounted on a motor vehicle. The image display device 8 is single, which simplifies the configuration and enables downsizing, and it is preferable to have a single image display device from the standpoint of continuing safe driving. It is.

Effects As described above, according to the present invention, one image display device can selectively and repeatedly display video signals from a plurality of video signal generating means, thereby simplifying the configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an electric circuit diagram showing the specific row η configuration of the switching circuit 16, FIG. 3 is a diagram showing the display state by the image display device 8, and FIG. Figure 4 is 'F
A flowchart for explaining the operation when turning on the lf source,
FIG. 5 is a flowchart for explaining operations according to operations on the keyboard 1. 1...Keyboard, 4...Teletext receiver, 8...
・Image display device, 10... printer

Claims (1)

[Scope of Claims] A keyboard, an image display means, and a plurality of video signal generation means for respectively deriving video signals of different signal formats to be displayed by the image display means, and an output from the keyboard for selecting a signal format. and control means for dialytically applying a video signal from the video signal generating means to the image display means in response to the above.