KR19990034049A - How to control channel switching on television - Google Patents

Abstract

According to the present invention, a key input unit including a channel selection key, a mixer for selectively outputting image signals output from a plurality of tuners by an input operation control signal, and text information corresponding to the input operation control signal are displayed on the screen. And a microcomputer for outputting an operation control signal to a mixer or an OSD display unit according to the signal output from the key input unit. The first step of determining the first, the second step of determining whether there is a broadcast signal in the tuned channel when there is a channel switch key input in the first step, and if the broadcast signal does not exist in the second step A third process of outputting an operation control signal and outputting an image signal of a non-signal channel through a sub-screen; The microcomputer outputs an operation control signal to the OSD display unit and outputs a predetermined character signal on the screen to determine whether there is a no-signal channel selection signal input from the key input unit; and the non-signal channel selection in the fourth process. And a fifth step of outputting a video signal of a non-signal channel to the main screen if there is a signal input, and continuously outputting a video signal previously output to the main screen if there is no signal input channel selection signal. By doing so, the video signal of the non-signal channel is not output to the main screen regardless of the user's will.

Description

How to control channel switching on television

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to television, and in particular, when a user intentionally or accidentally inputs a no-signal channel switching signal while watching a specific program in a PIP-type television, the user can output a video signal of a no-signal channel using a PIP screen and The present invention relates to a channel switching control method of a television, which warns a user of a no-signal channel by subtitles.

In order to meet the diversification of viewers' preferences, PIP (Picture in Picture) type televisions, which allow users to watch a plurality of programs at the same time, are commercialized.

1 is a block diagram illustrating an image processing system in a general PIP television.

In FIG. 1, reference numeral 1 denotes an antenna, 2a and 2b denote a tuner for selecting a broadcast signal of a channel selected by a preset voltage input from a wireless broadcast signal received through the antenna 1, In more detail, 2a represents a tuner for selecting a broadcast signal of a primary channel and 2b represents a tuner for selecting a broadcast signal of a subchannel.

5a and 5b represent an IF detector for detecting an image intermediate frequency signal PIF from a signal output from the tuners 2a and 2b, and 6a and 6b represent an image signal (outputted from the IF detectors 5a and 5b). An image processor which processes color, tint, and brightness for P) and outputs R (Red), G (Green), and B (Blue) signals corresponding to the image signals. Indicates.

In addition, reference numeral 8 denotes a key input unit for selecting a desired channel by the viewer or selecting various operation modes of the television including each mode of the television, that is, channel or volume selection, and reference numeral 10 denotes the key. It is a channel recording unit in which data of channels selected by a user through the input unit 8 is recorded.

Reference numeral 12 denotes an OSD (On Screen Display) for overlapping and outputting a character or a picture on the screen on which the broadcast signal is output separately from the broadcast signal according to the input operation control signal. 20 represents a mixer which selects and mixes a predetermined signal from the RGB signal output from the image processing unit 6a or 6b and the RGB signal which is the output signal of the OSD generation unit 12 according to the input operation control signal. The video signal output from the mixer 20 is output to the CRT driver 26 and output on the screen of the CRT 28. In this case, when there are a plurality of video signals output from the mixer 20, the video signals of the first selected channel are displayed over the entire screen, and the video signals of the later selected channel are output to a predetermined corner of the screen.

Reference numeral 30 denotes a microprocessor for outputting an operation control signal to various devices constituting the television on the basis of the signal input from the key input unit 8, and the channel tuning function of the microprocessor 30 will be described. Selects a predetermined channel through the key input unit 8, reads the data recorded in the channel recording unit 10, adds or subtracts the corresponding tuning signal, and outputs the selected channel to the tuner 2a or 2b. This channel is tuned, and a corresponding operation control signal is output to the mixer 20 according to the channel tuning to control the output of the video signal to the CRT driver 26.

In the above configuration, when the user wants to simultaneously watch a plurality of programs by the PIP method, when the user selects a plurality of programs through the key input unit 8, the microprocessor 30 recognizes this and recognizes the main video signal on the screen of the television. Denotes the entire screen and the sub-video signal is displayed within a predetermined range of the corner of the screen.

However, in the conventional television as described above, when the user intentionally or mistakenly selects another channel while watching a specific program, the video signal of the selected channel is output on the screen of the television regardless of whether or not the selected channel is signaled. If the selected channel is a no-signal, the user may view a bad screen, causing discomfort and having to continuously watch the screen of the no-signal channel in order to reselect a signal channel.

An object of the present invention for solving the problems described above is to use the PIP screen when a user intentionally or accidentally inputs a no-signal channel switching signal while watching a specific program in a PIP-type television. In addition to providing an output box, a method of controlling channel switching of a television that warns a user of a non-signaled channel through subtitles.

1 is a block diagram showing a schematic configuration of an image processing system in a conventional PIP television.

2 is a flowchart illustrating a channel switching control method according to the present invention.

Explanation of symbols on the main parts of the drawings

1 antenna 2a, 2b tuner

8: key input 12: OSD display

20: mixer 30: microcomputer

A feature of the present invention for achieving the above object is a key input unit having a channel selection key, a mixer for selectively outputting video signals outputted from a plurality of tuners by an input operation control signal, and an input operation control signal. In the channel switching control method of a PIP television comprising a OSD display for displaying the corresponding character information on the screen, and a microcomputer for outputting an operation control signal to the mixer or the OSD display in accordance with the signal output from the key input unit, A first step of determining whether there is a channel switch key input from an input unit, a second step of determining whether a broadcast signal exists in a channel selected when there is a channel switch key input in the first step, and broadcasting in the second step If there is no signal, Microcomputer outputs motion control signal to the mixer and passes the sub-screen for a certain time. A third process of outputting a video signal of a non-signal channel, and a microcomputer outputting an operation control signal to the OSD display unit for outputting a specific character signal preset on the screen for a predetermined period of time. And a fifth process of outputting the selected video signal to the main screen according to the result of the fourth process. It is to prevent output to the screen.

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention.

Looking at the configuration and function of the television according to the present invention with reference to the accompanying drawings as follows.

2 is a flowchart illustrating a channel switching control method of a television according to the present invention. In the embodiment of the present invention, the schematic configuration of the television is the same as that of FIG.

When the power is supplied, the microcomputer outputs an operation control signal corresponding to a signal input through the key input unit to each device so that the corresponding operation is executed, but when the power is applied, the microcomputer selects the channel selected when the user turns off the television. After reading from the channel recording unit and outputting a channel selection signal corresponding to the channel read from the channel recording unit to the first tuner, the microcomputer determines whether there is a channel switch key signal input from the key input unit (S101).

If there is no channel switch key signal input in step S101, the microcomputer continuously determines whether there is a channel switch key signal input in step S101. If there is a channel switch key input in step S101, the microcomputer uses the key input unit as a second tuner. The channel selection voltage corresponding to the channel selected by the user is output, and it is determined whether a signal exists in the channel selected based on the signal output from the second IF detector (S102).

If it is determined in step S102 that the signal is present, the microcomputer outputs an operation control signal to the mixer so that the video signal of the channel tuned by the second tuner is output on the main screen (S103).

If it is determined in step S102 that the signal does not exist, the microcomputer outputs an operation control signal to the mixer, and continuously outputs the video signal of the preset channel through the first tuner to the main screen, and displays the channel selected by the second tuner. The video signal is output to the sub picture (S104).

As described above, the microcomputer that displays the video signal of the non-signal channel as the sub-screen outputs an operation control signal to the OSD display unit and outputs a specific caption alarm on whether to select the non-signal channel by the caption on the screen (S105). It is determined whether there is no signal channel selection signal input from the signal output from the key input unit for a predetermined time (S106).

If there is no signal channel selection signal input in step S106, the microcomputer outputs the video signal of the selected no signal channel to the main screen (S103). If there is no signal channel selection signal input for a predetermined time, the microcomputer transmits the signal through the first tuner. The video signal of the set channel is kept on the main screen, and the video signal of the sub screen and the subtitle warning are deleted (S107).

After performing step S103 and step S107, the microcomputer returns the process to the step S101.

Therefore, according to the present invention, when a user intentionally or inadvertently selects an unsigned channel, the video signal of the channel selected through the sub-screen is output and the user is warned whether to select a no-signal channel through subtitles. Regardless of whether the video signal of the no-signal channel is output to the main screen, it will not occur.

According to the method for controlling channel switching of a television according to the present invention operating as described above, when a user intentionally or inadvertently selects an unsigned channel, an image signal of a channel selected through a sub-screen is output and no signal is transmitted through subtitles. It warns the user whether the channel is selected, so that the video signal of the no-signal channel is not output to the main screen regardless of the user's will, and thus, the satisfaction of using the television can be greatly improved.

Claims (1)

A key input unit having a channel selection key, a mixer for selectively outputting video signals output from a plurality of tuners by an input operation control signal, and an OSD display unit displaying character information corresponding to the input operation control signal on a screen And a microcomputer outputting an operation control signal to a mixer or an OSD display unit according to the signal output from the key input unit. Determining whether there is a channel switch key input from the key input unit; A second step of determining whether a broadcast signal exists in a tuned channel when there is a channel switch key input in the first step; A third step of outputting an operation control signal to the mixer and outputting a video signal of a no-signal channel through a sub-screen for a predetermined time when there is no broadcast signal in the second step; A fourth step in which the microcomputer outputs an operation control signal to the OSD display unit and outputs a specific character signal preset on the screen for a predetermined time to determine whether there is no signal channel selection signal input from the key input unit; A fifth process of outputting a video signal of a non-signal channel to the main screen if there is no signal channel selection signal input in the fourth process, and continuously outputting a video signal previously outputted to the main screen if there is no signal channel selection signal input; And a video signal of a non-signal channel is not output to the main screen regardless of the user's intention.