JPH0294881A - Multi-screen display device - Google Patents

Abstract

PURPOSE:To attain the confirmation of which kind of program is displayed on each channel at a glance by selecting plural predetermined channels sequentially in a prescribed order at application of power, writing an obtained picture data into a picture memory and displaying the data with reduction on the screen at the same time. CONSTITUTION:At application of power, a channel of a position 1 is selected and the signal is written in a picture memory 27 by a control section 19. The picture data written in the picture memory 27 is read synchronously with the display timing of a CRT 25. The display processing such as channel selection, data write, data readout and picture display is applied to the channel of a position 2, and then similarly the display processing for the corresponding channel is applied. Thus, at application power, since multi-screen display is attained automatically, the user can confirm which kind of program is broadcast on each channel at a glance by having only to apply the power.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention is an object of the present invention, which divides the screen of a display device such as a CRT into a plurality of small screens in a television receiver, and displays images for a plurality of channels. The present invention relates to a multi-screen display device that simultaneously displays images in reduced size.

(Prior Art) In recent years, in television receivers, due to the advancement of digital technology, so-called multi-screen display devices that divide the screen of a display device such as a CRT into multiple small screens and display images of multiple channels simultaneously in reduced size have been introduced. is being developed. Specifically, for example, there is a "tuning device" disclosed in Japanese Patent Application Laid-Open No. 61-15628 and a "television receiver" disclosed in Japanese Patent Application Publication No. 57-15509. The former uses four receiving circuits and four channel selection circuits to project 1.2 or 4 channels of screen onto the CRT screen. In the latter case, the tuning voltage of a single electronic tuner is sequentially changed, and images of multiple channels are projected as a still image on a part of the screen of the channel that was initially viewed.

In addition, we have also developed a device that captures image data into memory, compresses the data on the time axis by doubling the clock speed when reading, and displays the compressed image on a part of the main screen. has been done.

Furthermore, various devices have been considered in which a main screen is divided into a plurality of small screens, and images reduced in size are sequentially displayed from the upper left of the main screen in response to a trigger input.

Furthermore, by displaying one reduced image, capturing the special Jll image data into memory through the receiving channel, and displaying this at a screen position different from the screen position where it was previously displayed, different channels can be displayed on each small screen. Various devices for displaying reduced images have also been developed.

However, in all conventional multi-screen display devices, after the power is turned on, the multi-screen display is not performed unless the user provides some kind of trigger force. There was a problem that it was not possible to check whether the program was being broadcast.

(Problems to be Solved by the Invention) As described above, in the conventional multi-screen display device,
After turning on the power, if the user does not provide some kind of trigger input, a multi-screen display will occur, so even if you try to use the multi-screen display to check what programs are being broadcast on each channel, There was a problem in that it could not be confirmed at the same time as the power was turned on.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-screen display device that allows users to check what programs are being broadcast on each channel at the same time as the power is turned on.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the present invention detects whether or not power is turned on, and when the power is turned on, a plurality of predetermined channels are The system sequentially selects channels in the following order, writes the image data obtained by this selection into the image memory, and simultaneously displays the images of each chitunnel in a reduced size on the screen according to the image data written to the image memory. It is something.

(Function) According to the above configuration, when the power is turned on, multi-screen display is automatically performed, so the user can quickly see what programs are being displayed on each channel just by turning on the power. You can check with.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention.

In FIG. 1, first, the normal display operation for one channel will be explained.

A television broadcast signal received by the antenna 11 is frequency-converted into an intermediate frequency signal by the tuner 12, and then detected by the PIF detection circuit 13 to form a composite video signal. This composite video signal is provided to video chroma processing circuit 14 and deflection circuit 15.

The composite video signal supplied to the video chroma processing circuit 14 includes a luminance signal Y and a color difference signal RY.

After being converted into f3-Y, it is converted into a digital signal by analog/digital conversion circuits 16, 17, and 18. This digital signal is supplied to digital/analog conversion circuits 20, 21, and 22 via the control section 19, and is converted back into an analog signal. This analog signal is converted into RlG and B signals by the RGB matrix circuit 23 and supplied to the CRT drive circuit 24. The CRT drive circuit 24 has R, G,
The CRT 25 is driven according to the B signal to display the image of the receiving channel. On the other hand, the composite video signal supplied to the deflection circuit 15 is subjected to deflection of the CRT 25.

Further, 28 is a power supply circuit, which supplies various power supply voltages to each circuit.

Next, the multi-screen display when the power is turned on, which is a feature of the present invention, will be explained.

In this embodiment, it is detected whether or not the power is turned on, and when the power is turned on, images for a plurality of channels are simultaneously displayed in reduced size on the screen A as shown in FIG.

Note that FIG. 2 shows an example in which the screen A is divided into 16 small screens of 4 vertically and 4 horizontally, and images for 16 channels are displayed simultaneously. Here, the number attached to each small screen indicates the channel number.

Such multi-screen display is controlled by the microcontroller 26 in the circuit shown in FIG.

Here, the control of the microcomputer 26 will be explained with reference to the flowchart shown in FIG.

In the internal memory of the microcomputer 26, tuning data for 16 channels shown in FIG. 2 are set in advance in a predetermined order. Now, assume that the 16 channels shown in FIG. 2 are represented by 16 positions n (n-1, 2°3, . . . , 16) from position 1 to position 16.

In step S of FIG. 3, the designated position n in the microcomputer 26 is automatically set to 1 as an initial setting. In the next step S2, it is detected whether the power has been turned on. When the power is turned on, it is detected in the next step S3 whether or not there is any other key input, and if there is no other key input, the channel at position 1 is selected in step S4. As a result, the control unit 1 in FIG.
9 is supplied with image data (digital signal) of the channel at position 1. This image data is written into the image memory 27 by one control section under the control of the microcomputer 26 in the next step S5. In this case, the image memory 27 has 16 storage areas corresponding to each position n, and the image memory 27 has 16 storage areas corresponding to each position n.
The image data of the channel is written to the storage area of position 1.

The image data written in the image memory 27 is read out in synchronization with the display timing of the CRT 25 in the next step S6. In this case, the image data is read out after being thinned out appropriately, thereby compressing the data along the time axis -L. As a result, the image of the channel at position 1 is displayed on the small screen labeled with channel number 1 on screen A shown in FIG.

In the next step S7, n is incremented by 1, and the process returns to step S3 via step S. As a result, display processing such as channel selection, data writing, data reading, and image display is performed for the channel at position 2.

Thereafter, n is incremented by 1 in the same manner, and the display processing of the corresponding channel is performed.

When the final position 16 is reached, the process moves to step S9, n is returned to 1, and the same operation is repeated from position 1. Further, if the power source is not detected in step S2 or if another key power is detected in step S3, a predetermined process is performed in step SIO, and then the initial state is returned.

Note that writing image data to the image memory 27 is as follows:
This is done during the blanking period so as not to interfere with image display.

As described above, in this embodiment, it is detected whether or not the power is turned on, and when the power is turned on, multi-screen display is performed.

Therefore, according to this embodiment, multi-screen display is automatically performed when the power is turned on, so the user can see at a glance what programs are being broadcast on each channel just by turning on the power. It can be confirmed.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to this embodiment.

For example, in the previous embodiment, image data capture and image
Although a case has been described in which the display of the image data and the display of the image data are simultaneously performed in parallel, it goes without saying that the image display may be performed after the capture of image data for all channels is completed.

Further, in the previous embodiment, the case where the image data is written during the blanking period has been described, but it goes without saying that writing of image data may be performed during the image display period using cycle still.

It goes without saying that various other forms can be implemented without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the present invention, multi-screen display is automatically performed as soon as the power is turned on, so the user can check what programs are being broadcast on each channel just by turning on the power. You can check whether it is by using -1;1.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
This figure is a diagram shown to explain the multi-screen display operation of FIG. 1 on the screen, and FIG. 3 is a flowchart shown to explain the control of the microcomputer shown in FIG. 1. 11...Antenna, 12...Tuner, 13...
PIF detection circuit, 14... video chroma processing circuit,
15... Deflection circuit, 16, 17. 18... Analog/digital conversion circuit, 19... Control unit, 20°21.
22...Digital/analog conversion circuit, 23...R
GB matrix circuit, 24...CRT drive circuit, 25
...CRT, 26...Microcomputer, 27
...image memory. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Scope of Claims] Power supply detection means for detecting whether power is turned on; an image memory capable of storing image data for a plurality of predetermined channels; and power supply detection means for detecting whether power is turned on. means, a channel selection means for sequentially selecting the plurality of channels in a predetermined order when the power detection means detects that the power has been turned on; and image data of the channel selected by the channel selection means. data writing means for writing into the image memory, and image display means for displaying images for the plurality of channels in reduced size on a screen according to the image data written to the image memory by the data writing means. Features a multi-screen display device.