JP3037041B2 - Television receiver with small screen display function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver having a small-screen display function, and more particularly to a television receiver having a tuner and two or more signal processing circuits.

[0002]

2. Description of the Related Art Two tuners and a signal processing circuit are provided, and one of the tuners is sequentially tuned at a constant period to display a reduced image of each channel at a predetermined position on a screen in a strobe manner. There is one disclosed in Japanese Patent Publication No. 61-14707 (H04N5 / 45).

According to this conventional technique, a screen is divided into nine parts, and reduced still images of channels sequentially selected by one tuner are displayed on eight parts, and the remaining part is selected by the other tuner. The reduced moving image is displayed, and the broadcast contents of each channel can be easily known without the viewer switching the channel selection switch sequentially.

[0004] However, since the broadcast contents of each channel are displayed only as strobe-like still images, there is a problem that it is difficult to confirm the broadcast contents.

[0005] Further, as a result of listing the broadcast contents of each channel, if it is desired to continuously watch a certain channel, it is necessary to turn off a multi-screen and then turn on a channel selection switch of a desired channel. There is no difference from the normal channel selection operation and the operation is complicated.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems of the prior art, and to sequentially display the broadcast contents of each channel in a moving image that is easy to determine.

Another object of the present invention is to provide a television receiver with a small-screen display function that can easily switch to a channel that the user wants to view continuously.

[0008]

For this purpose, the present invention provides a method for producing
One tuner, two signal processing circuits, and a small screen forming circuit connected to the one signal processing circuit and forming one reduced moving image and at least one reduced still image,
A main screen forming circuit connected to the other signal processing circuit; a display circuit for synthesizing and displaying outputs of the sub screen forming circuit and the main screen forming circuit; and selecting a tuner and controlling the sub screen forming circuit. And an operation unit operated by a user.

[0009]

In such a configuration, the control unit of the present invention sequentially selects a plurality of channels in one tuner at a fixed period in response to an instruction from the operation unit, and outputs the output of the tuner to the small screen forming circuit. , And controls each unit to display a reduced moving image of the currently selected channel, a reduced still image of at least one or more previously selected channels, and a parent image received by the other tuner.

The control unit according to the present invention, in response to an instruction from the operation unit, stops the channel selection of the one tuner sequentially, and reduces the reduced moving image of the specific channel and the reduced still image of the previously selected channel. , The parent image received by the other tuner is displayed continuously.

The control unit according to the present invention, in response to an instruction from the operation unit, stops the sequential selection of the one tuner and stops displaying the reduced still image of the previously selected channel. , The reduced video of the selected channel and the parent image received by the other tuner are displayed.

Further, in response to an instruction from the operation unit, the control unit according to the present invention stops the sequential selection of the one tuner, connects the output of the tuner to the main screen forming circuit, and displays it as a main image. At the same time, the output of the other tuner is connected to the small screen forming circuit and displayed as a reduced moving image.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, 1 is a first tuner / IF circuit,
2 is the second tuner / IF circuit, 3 is the first tuner / IF circuit
The first tuning circuit 4 connected to the circuit 1 has a second tuner /
Second channel selector circuits 5 and 6 connected to the IF circuit 2 are a first switch and a second switch, respectively. 7 is a video chroma circuit for demodulating a parent image, 8 is a sync separation circuit for the parent image, 9 Is a video chroma circuit for demodulating a child image,
Reference numeral 0 denotes a synchronization separation circuit for a child image.

Reference numeral 11 denotes a parent screen forming circuit which changes the display position of the parent image and converts the aspect ratio. 12
Is a small screen forming circuit, which outputs a reduced image by thinning out an image signal and storing it in a memory and reading it out at a speed faster than reading, but in the present embodiment, a small screen of up to three screens can be created. And 13 is a vertical deflection circuit,
14 is a horizontal deflection circuit, 15 is a parent-child screen synthesis circuit or RGB
This is a display circuit including a matrix circuit, an output amplifier, and the like. Further, 16 is a CRT having an aspect ratio of 16: 9,
Reference numeral 17 denotes a CPU for controlling each circuit, and reference numeral 18 denotes a remote control transmitter serving as an operation unit.

Next, the general operation of the television receiver will be described.

Now, in this television receiver, a first channel selection circuit 3
When only the signals tuned by the first tuner / IF circuit 1 are displayed, the first switch 5 is connected to 1-a and the second switch 6 is connected to 2-c. Therefore, the signal received by the second tuner / IF circuit 2 is not transmitted to a subsequent circuit.

The signal received and processed by the first tuner / IF circuit 1 is demodulated by a video chroma circuit 7 for parent image, and a synchronization signal is separated by a synchronization separation circuit 8 for parent image. Is entered. Now, the aspect ratio of the received signal is 4: 3, and the aspect conversion is performed by the CPU 17.
, The parent screen forming circuit 11 outputs the signal to the display circuit 15 as it is, and as shown in FIG. Is displayed together with the non-image portion 25 of the image.

When the aspect conversion is instructed by the CPU 17, it goes without saying that the aspect is converted and output at 16: 9.

In this state, when a small-screen display is instructed, the second switch 6 is connected to 2-b, and the channel selected by the second tuning circuit 4 is switched to the second tuner / IF circuit 2.
, And transmitted to the subsequent stage.

This signal is supplied to a video chroma circuit 9 for a child image.
The sync signal is separated by the slave image sync separation circuit 10 and then input to the slave screen forming circuit 12. The small screen forming circuit 12 can create up to three reduced screens. In this state, the channel selected by the second tuning circuit 4 is reduced and output.

In the display circuit 15, the main screen forming circuit 11,
The output of the small screen forming circuit 12 is synthesized and processed, and the
At T16, for example, a display is made as shown in FIG. In the case of FIG. 5, a parent image having an aspect ratio of 4: 3 and an aspect ratio of 16:
9 shows a case where nine child images are displayed.

Next, a search operation which is a feature of the present invention will be described.

FIG. 6 shows a remote control transmitter 18 used in this embodiment. Now, when the index button 22 on the remote control transmitter 18 is pressed, the CPU 17 receives this,
Enter search operation.

When the search operation is started, the CPU 17 sends a channel selection up (or down) signal to the second channel selection circuit 4 at a constant cycle, and sequentially selects each channel. At this time, the second switch 6 is connected to 2-b and processed by the video chroma circuit 9 for child images and the synchronization separation circuit 10 for child images. The small screen forming circuit 12 has a memory capable of holding three pieces of small screen information. The second screen selecting circuit 4 can display and display a reduced moving image by writing and reading the image signal of the channel being tuned by the second tuning circuit 4. From the two memory areas, a reduced still image can be displayed by repeatedly reading image information written in the past.

FIG. 4 shows the state of the screen at this time. FIG.
In this example, a parent image having an aspect ratio of 4: 3 and a child image having the same aspect ratio of 4: 3 are displayed. One of the child images is a moving image, and the other two are still images. Now, if the uppermost child image is a moving image, the second
The tuning circuit 4 advances, a reduced moving image of the newly selected channel is displayed on the middle sub-screen, and the uppermost sub-screen which has been a moving image is the same as that of the previously selected channel. The final screen is displayed as a still image. After a certain period of time,
The bottom row displays the reduced moving image of the newly selected channel.

In this manner, the contents of each broadcasting station sequentially selected are sequentially displayed on three child screens. Moreover,
Since the video is temporarily displayed as a moving image, the user can easily determine the content of each broadcast station.

Next, the operation will be further described with reference to FIG.

As described above, first, the remote control transmitter 18
By pressing the index button, the sub-screen search operation starts. (Steps S1 and S2) Next, after writing into the memory for forming the sub-screen so as to be entirely black, the sub-screen is displayed. (Step S3) At this time, a reduced moving image of the currently selected channel is displayed on the screen,
The other two screens are all black.

Next, the writing of a new signal of the channel is stopped (step S4), and the channel is advanced. Preferably, at this time, a channel where there is no broadcast station should be skipped. (Step S5) At this time, the screen 19 displays a reduced still image of the channel selected previously, the screen 20 displays a reduced moving image of the channel currently selected, and the screen 21 is black on one side. In this state, if there is no key input for a predetermined time (step S1)
0), the process returns to step S4, and the channel being selected is set as a still image, and then the channel is advanced by one. (Step S
5) Here, when the two-screen button 23 of the remote controller transmitter 18 is pressed (step S6), the process proceeds to step S11, where the screen is brought into the state shown in FIG. 5, and only the image of the channel selected at step S6 is the sub-screen. Is displayed continuously. Therefore, when a program that the user wants to view continuously during the search operation is found, but the parent screen is to be kept as it is, by performing such an operation, the parent screen remains unchanged.
You can watch other channels on the inset screen.

During the search operation, the screen change button 2
When 4 is pressed (step S7), the process proceeds to step S12,
The channel currently selected on the sub-screen is displayed on the main screen, and the channel previously displayed on the main screen is displayed on the sub-screen. Aside from the display contents, the screen is as shown in FIG.
Therefore, when a program that the user wants to view continuously during the search operation is found and the user wants to view the program on the main screen, the user can view the program on the main screen by performing such an operation, and the channel of the parent image that has been watched so far is displayed on the child screen. You can see it on the screen.

Further, when the index button 22 is pressed again during the search operation (step S8), a step S13 is performed.
If the mode is the search mode, the search mode is canceled in step S14 and the process waits for a key input in steps S6 to
It goes around S8. Therefore, the channel selection of the sub-screen does not advance, and only one sub-screen continues to display the reduced moving image in the screen state of FIG. (Of course, the reduced still images are displayed on the other two child screens.) As is clear from FIG. 2, even in this state, the two screens 23 and the screen replacement 2 are displayed.
Each key input of No. 4 is valid. However, when the index key 22 is pressed once more, step S
8. The process proceeds to steps S13 and S15 to turn off all the sub-screen displays, return the screen to the normal state of FIG. 3, and end the search operation.

[0033]

As described above, according to the present invention, the contents of each broadcasting station can be sequentially displayed as a reduced moving image with a simple operation, so that the broadcast contents can be easily identified.

When a program that the user wants to view continuously during such a search operation is found, the program is displayed on the main screen.
The other two screens to be displayed on the small screen and the desired display mode such as viewing on the small screen while displaying the reduced still image of the other channel can be instantly switched to a television with a small screen display function which is very easy for the viewer to use. A John receiver can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

FIG. 3 is a diagram illustrating a display example of a screen.

FIG. 4 is a diagram showing a display example of a screen.

FIG. 5 is a diagram showing a display example of a screen.

FIG. 6 is a view showing a remote control transmitter used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st tuner / IF circuit 2 2nd tuner / IF circuit 3 1st channel selection circuit 4 2nd channel selection circuit 11 Main screen forming circuit 12 Child screen forming circuit 15 Display circuit 16 CRT 17 CPU

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/44-5/45

Claims (1)

(57) [Claims] 1. A small picture forming circuit connected to two tuners, two signal processing circuits, and one of the signal processing circuits to form one reduced moving image and at least one reduced still image. A main screen forming circuit connected to the other signal processing circuit; a display circuit for synthesizing and displaying outputs of the sub screen forming circuit and the main screen forming circuit; and selecting a tuner and controlling the sub screen forming circuit. The control unit, in response to an instruction from the operation unit, sequentially selects a plurality of channels in the one tuner at a fixed cycle, the control unit, The output of the tuner is connected to the small screen forming circuit, and the reduced moving image of the currently selected channel, the reduced still image of at least one or more previously selected channels, and the parent image received by the other tuner are obtained. While displaying, The control unit, in response to an instruction from the operation unit, stops sequentially selecting the one tuner, stops displaying the reduced still image, and displays the reduced moving image of the selected channel and the other A television receiver with a child screen display function that displays a parent image received by a tuner.