JPH0746847B2 - Television receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver in which a main screen area is provided with a sub screen area and images of different contents can be displayed in the main sub screen area.

[Outline of Invention]

The present invention, in a so-called picture-in-picture type television receiver in which a sub-screen area is provided in the main screen area and images of different contents can be displayed in the main-sub-screen area, the image content displayed in the main screen area When the number is changed, the image content is displayed in the sub-screen area as well as the sub-screen area each time, so that the usability of the user is improved.

[Conventional technology]

Conventionally, a so-called picture-in-picture type television receiver (hereinafter referred to as "P /
(P TV)) is proposed. In this case, for example, the main tuner for obtaining the main-screen video signal and the sub-tuner for obtaining the sub-screen video signal are specially configured. In such a P / P television, the main and sub tuners can independently perform channel selection operations, and in response to each channel selection, an identification display of image content in the main and sub screen area, for example channel selection, is performed. It is possible to display the channels independently.

[Problems to be solved by the invention]

Here, if the channel selected by the sub-tuner changes,
There is no problem in identifying and displaying the image content only in the sub-screen area. However, when the channel selected by the main tuner is changed, there is a problem in that the image contents are identified and displayed only in the main screen area. That is, the image displayed in the sub-screen area is easily regarded as a subordinate of the image displayed in the main screen area. In this case, therefore, it is better to display the image content in the sub-screen area for identification. preferable. This problem also occurs with respect to the external video input signal and its identification display.

In view of the above point, the present invention is such that, whenever the image content displayed in the main screen area is changed, the image content is identified and displayed not only in the main screen area but also in the sub screen area. is there.

[Means for solving problems]

The present invention provides a main screen system circuit means and a sub screen system circuit means for a display means (18) for displaying main and sub channel signals from a plurality of tuners (5M) (5S) on the main screen Sm and the sub screen Ss. In a television receiver having a system control means (20) for controlling, a main character display for displaying an image identification display character is provided in the main screen system circuit means, and the main screen area of the display means (18) is displayed. Means (19M) and sub-character display means (19S) provided in the sub-screen system circuit means for displaying the image identification display character on the sub-screen area of the display means (18),
Selecting means (22) (24) for selectively reproducing and displaying the image of the main and sub channel signals via the system control circuit (20), and the displaying means (18) by the selecting means (22) (24). When the image content displayed in the main screen area displayed on the screen is changed, the main and sub character display means (19M) and (1
9S) is controlled by the system control means (20) to display the image identification character in both the main and sub-screen areas each time the change is made, and when the image content displayed in the sub-screen area is changed, A television receiver characterized in that the character display means (19) is controlled by the system control means (20) to display an image identification character only in the sub-screen area each time the character display means (19) is changed.

[Action]

In the above configuration, when the image content displayed in the main screen area is changed, the image content is displayed in the main screen area in an identifying manner, and the sub-screen area is also presented in an identifying display.

〔Example〕

An embodiment of the television receiver according to the present invention will be described below.

First, with reference to FIG. 3, an overall configuration of a television receiver according to an embodiment will be described. This television receiver has a main television circuit MK and a sub-television circuit SK, based on a video signal from the main television circuit MK,
The main screen is projected on the entire tube surface of the cathode ray tube (18), and based on the video signal from the sub-television circuit SK, the sub-screen is projected on the tube surface so as to fit into a part of the main screen. These television circuits MK and SK are tuners (5M), (5S),
It is equipped with video intermediate frequency circuits (6M), (6S) and video / color signal circuits (8M), (8S).

Also, it has external video signal input terminals V ₁ , V ₂ and V ₃ to which the reproduced video signal (baseband signal) from the VTR or the like is supplied, and the external video signal from these input terminals is supplied to the television circuit.
The video signals from the tuners (5M) and (5S) are switched by the switch circuits (7M) and (7S) provided in the MK and SK, respectively, and are supplied to the cathode ray tube (18) to display the image. Is made possible.

The sub-television circuit SK is provided with a video signal processing circuit (12) for projecting the sub-screen on the cathode ray tube (18), which allows moving images, still images, frame shooting images of the sub-screen, etc. Another
The number of sub-screens, the position of the sub-screens on the main screen, etc. are controlled.

Each of the television circuits MK and SK has a character display circuit (19
M) and (19S) are provided so that the main screen and the sub screen can be displayed separately by superimposing image identification displays such as the television broadcast reception channel and the number of the external video signal input terminal. ing.

System control circuit with microcomputer (20)
Is provided to control each part of the television receiver.

Next, the configuration of this television receiver will be described in more detail. The received signal from the antenna AT is supplied to the branching device (1). This branching device (1) supplies the received signal to the main tuner (5M) through the switch circuit (3) with almost no attenuation, and part of it is supplied to the sub-tuner (5S). The received signal to the sub tuner (5S) is amplified by the high frequency amplifier (4). The switch circuit (3) includes an antenna input from the branching device (1) and an auxiliary input terminal (2).
Of the main tuner (5M) by switching the high frequency input from the descrambler for receiving cable television broadcasting.
Supply to.

The video intermediate frequency signal from the main tuner (5M) is supplied to the main video intermediate frequency circuit (6M), the video signal from this is supplied to the main switch circuit (7M), and the external video signal input terminal
It is switched to the external video signal from V _{1 to} V ₃ , and one of the video signals is supplied to the main video / color signal circuit (8M). Incidentally, (26) is a monitor output terminal, which is connected to the output side of the main switch circuit (7M). The main video / color signal circuit (8M) outputs red, green, and blue signals R, G, B, and supplies them to the switch circuit (9).

The audio intermediate frequency signal from the main video intermediate frequency circuit (6M) is supplied to the audio circuit (which has a built-in audio multiplexing circuit) (28), and the audio signal from the audio circuit (28) is switched to the switch circuit (29). Are supplied to the external video signal input terminals V ₁ to
Of external audio signal input terminals A ₁ , A ₂ , A ₃ corresponding to V ₃
It is switched with the external audio signal reproduced from VTR etc., and one of the audio signals is passed through the low frequency amplifier (30),
It is supplied to the speaker (31).

Horizontal and vertical synchronizing signals from the main image / color signal circuit (8M) are supplied to the deflection / high voltage circuit (27), and the deflection signal and high voltage DC voltage from this are supplied to the cathode ray tube (18).

The video intermediate frequency signal from the sub tuner (5S) is supplied to the sub video intermediate frequency circuit (6S), the video signal from this is supplied to the sub switch circuit (7S), and the external video signal input terminal
After switching to the external video signal from V _{1 to} V ₃ , one video signal and the video signal from the main switch circuit (7M) are switched by the switch (25), and then the sub video / color signal circuit ( 8S). Red, green, and blue signals R, G, B are obtained from this sub-picture / color signal circuit (8S) and are supplied to the matrix circuit (10) for luminance, red difference and blue difference signals Y, R. After being converted into -Y and BY, the signals are supplied to the A / D converter (13) of the video signal processing circuit (12).

This A / D converter (13) is a time division type A / D converter as disclosed in Japanese Patent Publication No. 60-44792. A / D converter (1
The digital signal from 3) is supplied to the memory (14) and written. The digital signal read from the memory (14) is supplied to the D / A converter (15) and converted into an analog signal. In the video signal processing circuit (12), lines and pixels of the video signal are thinned according to the size ratio of the main screen and the sub screen. The memory (14) has four frame (or field) memory areas according to the maximum possible number of sub-screens, for example, four. The memory (14) is controlled by the sub-screen control circuit (16) such as whether the sub-screen is a moving image, a still image, a frame shot image, the number of sub-screens, the position of the sub-screen on the main screen or the like.

When making a moving image of the sub-screen, writing and reading of the video signal of the memory (14) are continuously and alternately repeated. When the sub-screen is to be a still image, the video signal is written in the memory (14) in units of frames or fields and then read repeatedly. Memory (14) when taking sub-frame shots
After writing a plurality of video signals in units of frames or fields at different timings, this is repeatedly read (see Japanese Patent Laid-Open No. 56-27573). The number of sub-screens to be fitted in the main screen is determined by the number of used memory areas in the memory (14). As the contents of the sub screen,
Video signals from the color signal circuit (8S), still images, frame shot images, or video signals from the main video / color signal circuit (8M) still images and frame shot images can be switched between these video signals. This is performed by switching the switch (25) described above. The image contents of the main screen and the sub screen can be switched by simultaneously switching the receiving channels of the main and sub tuners (5M) and (5S), or by simultaneously switching the main and sub switch circuits (7M) and (7S).

Each color signal from the main video / color signal circuit (8M) and each color signal from the D / A converter (15) of the video signal processing circuit (12) are supplied to the switch circuit (9) to The respective color signals are switched so that the sub-screen is fitted in the selected predetermined position of the set. The switch circuit (9) is controlled by the sub-screen control circuit (16). The video signal from the switch circuit (9) is supplied to the cathode ray tube (18).

The main image identification display signal generated by the main character display circuit (19M) is added to the video signal by the adder (17) provided between the switch circuit (9) and the cathode ray tube (18). Here, for example, the adder (17) is inserted only in the transmission path of the green signal so that the green image identification display is superimposed on the main screen. This image identification display may be in another color.

The sub-image identification display signal generated by the sub-character display circuit (19S) is added to the sub-picture signal by the adder (11) provided between the matrix circuit (10) and the A / D converter (13). . Here, for example, the adder (11) is inserted only in the transmission path of the luminance signal so that the white image identification display is superimposed on the sub-screen. This image identification display may be in another color.

The main and sub tuners (5M) and (5S) described above are selected by the tuning data from the system control circuit (20). The switch circuits (3), (7M), (7S), (29) and the switch (25) are switched and controlled by the system control circuit (20). Main and sub video / color signal circuit (8M), (8S)
Is blanked by the system control circuit (20) during up and down scanning channel selection. In addition, this blanking may be performed by providing a blanking switch in front of the cathode ray tube (18). Also, the main and sub-horizontal synchronizing signals Hm, Hs from the main and sub-picture intermediate frequency circuits (6M) and (6S) and the main and sub-picture / color signal circuits (8M) and (8M
S) Primary and secondary vertical blanking signal (vertical signal) V
m and Vs are supplied to the system control circuit (20). The main and sub character display circuits (19M), (19S) and the sub screen control circuit (16) are controlled by the system control circuit (20).

(21) is a last condition memory, which is the main and sub tuner (5M) and (5S) channel selection channels when the power is cut off, the switching state of the switch circuits (7M) and (7S), and the sub screen control circuit (16) The control state and the like are stored under the control of the system control circuit (20). When the power is turned on again, the states of the respective parts when the power is turned off are reproduced by the control of the system control circuit (20).

A key device (22) is connected to the system control circuit (20) and has various keys for controlling the television receiver.

(24) is a remote controller for controlling the television receiver, which is provided with various keys and has a transmitter for transmitting a remote control signal based on the operation of the keys. (2
3) is a receiver for receiving a reception signal from the transmitter of the remote controller (24), which is connected to the system control circuit (20). This remote control signal is carried by light, radio waves, sound waves, or the like.

Next, examples of keys of this remote controller (24) are listed. Power key, recall key (displays the image identification display), mute key (silence of audio), numeric keypad for selecting the receiving channel and external video signal input terminal number, TV / VTR switching key, antenna input / Auxiliary high frequency input switching key, voice multiplex key. Picture and main receive channel and main external video signal input terminal number and volume up and down keys respectively. Sub-screen ON / OFF key, sub-receiver channel and sub-external video signal input terminal number up key, same down key, still image key, frame shooting key, sub-screen position movement key, main and sub-screen image content Swap key.

Further, in this example, when the up or down key of the number of the main reception channel and the main external video signal input terminal of the remote controller (24) is pressed and the image content displayed in the main screen area is changed, , The respective image identification displays are made in both the main and sub screen areas. That is, at this time, the system control circuit (20) controls the operation according to the flowchart of FIG.

That is, when the up or down key is pressed, video blanking of the main / sub screen area is started. This video blanking is performed by, for example, the main and sub video / color signal circuits (8M),
It will be held in (8S). Next, when the image based on the video signal from the main tuner (5M) is displayed in the main screen area and the main reception channel is up or down, the main tuner (5M) corresponds to the up or down reception channel. The tuning data (PLL data) is set, and the main tuner (5M) is brought into the tuning state of the up or down receiving channel. On the other hand, when the image by the video signal from the external video signal input terminals V _{1 to} V ₃ is displayed in the main screen area and the number of the external video signal input terminal is up or down, the up or down external video signal The changeover switch data of the main switch circuit (7M) is set according to the number of the input terminal,
As a result, the main switch circuit (7M) is switched so as to output the video signal from the external video signal input terminal having the up or down number. Next, the image identification display data of the main screen area is set. Then, this image identification display data is supplied to the main character display circuit (19M),
A main image identification indication signal is generated. Next, the image identification display data of the sub-screen area is set. And
This image identification display data is supplied to the sub-character display circuit (19S), and a sub-image identification display signal is generated. Next, the blanking is canceled, the main image with the changed image content is displayed in the main screen area, and the sub-image having the same image content as the original is displayed in the sub-screen area. At this time, respective image identification displays are made in both the main and sub screen areas. Then, this image identification display is erased, for example, after 2 seconds.

For example, when the image contents as shown in FIG. 4A are respectively displayed in the main and sub-screen areas Sm and Ss before the up key is pressed, when the up key is pressed, the main screen area is displayed as shown in FIG. While the image content displayed in Sm is changed, each image identification display is made in both the main and sub-screen areas, and this image identification display is erased after 2 seconds.

Further, in the present example, when the up or down key of the number of the sub external video signal input terminal for performing the sub receiving channel of the remote controller (24) is pressed and the image content displayed in the sub screen area is changed, The image identification display is made only in the sub-screen area. In other words, at this time,
The system control circuit (20) is controlled to operate in accordance with the flowchart of FIG.

That is, when the up or down key is pressed and then the image by the video signal from the sub tuner (5S) is displayed in the sub screen area, and when the sub receiving channel is up or down, the up or down reception signal is received. The tuning data of the sub-tuner (5S) is set corresponding to the channel, whereby the sub-tuner (5S) is brought into the tuning state of the up or down receiving channel. On the other hand, when the image by the video signal from the external video signal input terminals V _{1 to} V ₃ is displayed in the sub-screen area and the number of the external video signal input terminal is up or down, the up or down external video signal The changeover switch data of the sub switch circuit (7S) is set in correspondence with the number of the input terminal, whereby the sub switch circuit (7S) receives the video signal from the external video signal input terminal having the up or down number. Switch to output. Next, the image identification display data of the sub-screen area is set. Then, the image identification display data is supplied to the sub-character display circuit (19S), and the sub-image identification display signal is generated. By the above operation, the sub-image whose image content has been changed is displayed in the sub-screen area, and the image identification display is performed in this sub-screen area. A main image having the same image content as the original is displayed in the main screen area. Then, the image identification display of the sub-screen area is erased after, for example, 2 seconds.

For example, before the up key is pressed, when the image contents as shown in FIG. 5A are displayed in the main and sub screen areas Sm and Ss, respectively, when the up key is pressed, the sub screen area is displayed as shown in FIG. The image identification display is made only in, and this image identification display is erased after 2 seconds.

Thus, according to this example, when the image content displayed in the main screen area is changed, not only the image identification display is made in the main screen area, but also the image identification display is made in the sub screen area. Therefore, the user can confirm that the image content displayed in the sub-screen area is the same and can relieve the anxiety, thereby improving the usability of the user.

〔The invention's effect〕

According to the present invention described above, when the image content displayed in the main screen area is changed, not only is the identification display of the image content displayed in the main screen area each time, but also the image is displayed in the sub screen area. Since the content is identified and displayed, the user's anxiety about the image content displayed in the sub-screen area can be eliminated, and the usability for the user can be improved.

[Brief description of drawings]

1 and 2 are flowcharts for explaining the operation of the example of FIG. 3, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIGS. 4 and 5 are explanations of the example of FIG. FIG. (5M) and (5S) are tuners, (7M) (7S) and (9)
Is a switch circuit, (8M) and (8S) are video / color signal circuits, (12) is a video signal processing circuit, (18) is a cathode ray tube,
(19M) and (19S) are character display circuits, and (20) is a system control circuit.

Claims (1)

[Claims] 1. A television image receiver having system control means for controlling main screen system circuit means and sub screen system circuit means with respect to display means for displaying main and sub channel signals from a plurality of tuners on the main screen and sub screen. In the machine, main character display means provided in the main screen system circuit means for displaying an image identification display character in the main screen area of the display means, and the display means provided in the sub screen system circuit means A sub-character display means for displaying an image identification display character on the sub-screen area of the above, and a selection means for selectively reproducing and displaying the image of the main / sub-channel signal via the system control circuit. When the image content displayed in the main screen area displayed on the display means is changed by the above, the system control means controls the main and sub character display means,
Each time it is changed, the image identification characters are displayed in both the main and sub-screen areas, and when the image content displayed in the sub-screen area is changed, the sub-character display means is controlled by the system control means and changed. A television receiver characterized by displaying an image identification character only in the sub-screen area each time.