KR20020034244A - Method and apparatus for realizing PIP of TV - Google Patents

Abstract

PURPOSE: An apparatus and a method for generating a sub-screen of a TV are provided to control the speed of displaying the sub-screen based on the kind of the sub-screen and display the edge of the sub-screen in various colors according to the kind of the sub-screen. CONSTITUTION: When a user inputs a sub-screen on/off command, initial parameters for executing program are set up(S1), and a display control register of a video processor of a digital TV is extracted to judge the input command(S2,S3). When the sub-screen off command is detected from the display control register, the size of the sub-screen is initialized, and a display mode is set according as the sub-screen has been zoomed out or not(S7). When the sub-screen on command is detected from the display control register, the edge color, position and size of the sub-screen are set. An input signal is selected, and the display mode is set according to the state right before the sub-screen. A position where the sub-screen starts is set, and the display speed of the sub-screen is determined.

Description

TV sub-screen generating apparatus and method {Method and apparatus for realizing PIP of TV}

The present invention relates to a digital TV, and more particularly, to a method for generating a sub-screen of a digital TV.

In general, digital satellite broadcasting requires multiplexing of TV signals. When multiplexing such TV signals (audio / video signals), each of the video audio is divided into a string of appropriate lengths called packets. The video and audio packets are appropriately switched by attaching additional information such as a header and transmitted to the repeater (communication satellite) in a time division transmission method.

The packet transmitted through the repeater (communication satellite) is restored to the original signal through the subscriber's Digital Broadcasting System (DBS) receiver, thereby enabling viewing of the channel transmitted from the broadcasting station.

At this time, the broadcasting station converts the video, audio and transmission data signals into a scrambled digital signal according to the Moving Picture Experts Group (MPEG) standard. It consists of a stream to make one TV signal stream.

The packet stream is a signal composed of 188 bytes, and the signal may be divided into a header and a payload portion.

The header part includes information indicating the start of a signal and a PID (packet identifier) number indicating what signal is a signal contained in the payload unit.

The payload portion contains image information, audio information or additional information to be transmitted.

The PID (packet identifier) number provides a means for demultiplexing a time multiplexed signal. The PID identifier determines whether the current packet is a video packet, an audio packet, or an additional information (SI) packet. Can be identified.

The video and audio standard is a standard for compressed video and audio signal sequences. Video, audio, and other additional information are time-multiplexed and carried in multiple transport stream packets, which are also distinguished by PID numbers.

That is, the PID number is an identification number indicating whether the current packet is a video packet, an audio packet, or additional information (PSI). In the US digital TV standard, PSIP (Program And System Information Protocol) is included in the additional information. do.

The PSIP includes a master guide table (MGT) that manages versions of all tables, a terrestral virtual channel table (TVCT) that stores channel information, a rating region table (RRT) having a rating table for each program, and a current program. It consists of ETT (Extended Text Table) that contains detailed information of future programs, and System Time Table that transmits the current time.

Hereinafter, a digital TV according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a digital TV according to the prior art.

As shown in FIG. 1, the digital TV according to the related art receives a VSB (Vestigial Side band) or QAM (Quadrature Amplitude Modulation) signal received from the antenna 10 and outputs a transport signal sequence. A TP parser 30 that receives the transport signal sequence output through the tuner 20 and performs demultiplexing, and an audio that is decoded by receiving a demultiplexed voice signal through the TP parser 30. A decoder 40, a D / A converter 50 for converting an output signal of the audio decoder 40 into an analog signal and outputting the same through a speaker, and a demultiplexed image through the TP parser 30 A video decoder 60 for receiving and decoding a signal, a user interface 100 for inputting a user's request command, and a corresponding channel to be tuned according to a request command input through the user interface 100. A microcomputer 110 for controlling the TP parser 30 and storing the corresponding information, an OSD processor 120 for outputting information in OSD form according to the control signal of the microcomputer 110, and the video decoder. (60) or a switching unit 70 for selectively outputting the output of the OSD processor 120, an image processing unit 80 for processing the output of the switching unit 70 as a displayable signal on the screen, and VCD 90 for processing the output of the image processing unit 80 to be output through the CRT.

As illustrated in FIG. 2, the image processor 80 may include a first input unit 80a for receiving a main image signal, a second input unit 80b for receiving a sub-screen image signal, and the first and second portions. A memory 80c for storing an image signal input through the input units 80a and 80b, a first format converter 80d for converting a signal stored in the memory 80c to display a signal on a sub-screen, and When the signal is to be displayed on the main screen, the second format converter 80e converts the signal stored in the memory 80c and the preprocessing to improve the image quality of the signal converted by the second format converter 80e. A pre-processing unit 80f, a multiplexing unit 80g for mixing the main and sub-pictures, a CSC (Color Space Converter) 80h for converting the video signal mixed in the multiplexing unit into YPbPr or RGB color signals, The color signal converted by the CSC 80h displays the correct color To this end, the graphic processing unit 80j for overlaying the OSD so that the GUI appears properly through the LUT (Look Up Table) 80i and the output of the graphic processing unit 80j are converted into analog signals and converted into YPbPr signals. It consists of the D / A converter 80k which outputs.

The operation of the digital TV configured as described above is as follows.

The tuner 20 receives and detects a VSB or QAM signal from the antenna 10, corrects an error, and outputs a transport signal sequence. The TP parser 30 receives the transport signal sequence and performs demultiplexing. do.

Here, the demultiplexing means detecting a PID number and dividing it into an image signal sequence, an audio signal sequence, and an additional information signal sequence. The audio signal sequence is applied to the audio decoder 40, and the image signal sequence is applied to the video decoder 60. The additional information signal string is applied to the microcomputer 110.

The audio decoder 40 expands the voice signal string compressed in Dolby AC3 format and outputs the same to the D / A converter 50. The D / A converter 50 converts the digital voice signal into an analog voice signal and converts the speaker. It is output through left / right of.

The video decoder 60 extends the video signal sequence compressed with MPEG-3 and outputs it to the NTSC encoder (not shown).

The microcomputer 110 extracts and processes the output from the TP parser 30 and outputs a control signal to correspond to user-specific requests applied through the user interface 100 such as a remote controller or a key operation.

The OSD processor 120 extracts OSD information corresponding to a request signal of the user interface 100 from the memory 130 and outputs an OSD image signal.

The switching unit 70 performs a switching operation to selectively output the output of the video decoder 60 or the OSD processor 120, and the image processing unit 80 outputs an image signal output from the switching unit 70. The luminance signal (Y) and the color signal (C) are output so that they can be displayed on a mobile or monitor.

The image processing unit 80 converts the extended image signal into an YPbPr signal and outputs it to the VCD 90 so as to be output as a luminance signal Y and a color signal C for display on a general television or a monitor.

As described above, since the digital TV according to the prior art has only a function of turning on / off a sub-screen, various functions cannot be given to the user.

The present invention has been made to solve the above problems, and provides a method for generating a sub-screen of a digital TV so that the screen appears gradually rather than instantaneously when the sub-screen is generated, and at the same time, the border color is displayed according to the type of the sub-screen. Its purpose is to.

1 is a block diagram showing the configuration of a digital TV according to the prior art

FIG. 2 is a block diagram illustrating an internal configuration of the image processor shown in FIG. 1.

3 is a flowchart illustrating a method for generating a sub-screen of a digital TV according to the present invention.

The sub-screen generation method of the digital TV according to the present invention for achieving the above object is a method for generating a sub-screen of the digital TV with an image processing unit, when the user inputs a sub-screen on / off command for the initial execution of the program Setting a variable, extracting a display control register of the image processor, and determining an input command; initializing a subscreen size when a subscreen off command is detected from the extracted display control register; A second step of setting a display mode according to whether or not the sub screen has been set out; and setting a border color, a position, and a size according to the type of the sub screen when a sub picture on command is detected from the extracted display control register. Step 3, select the input signal to input and change the display mode according to the state just before the sub-screen Setting the determined fourth step and the sub-screen, the starting position, and makin comprises a fifth step of determining a display rate of the display unit depending on whether the predetermined mode has its features.

Hereinafter, a method of generating a sub-screen of a digital TV according to the present invention will be described in more detail with reference to the accompanying drawings.

In the method for generating a sub-screen of a digital TV according to the present invention, referring to FIG. 3, first, an initial variable is set (S1).

When the initial variable is set, the register is initialized and the screen control register is read (S2).

Then, the lower nibble of the display control register is read (S3).

Subsequently, it is determined whether the subscreen is in an off state (S4).

As a result of the determination (S4), if the subscreen is in the off state, the size of the subscreen is set to 0 instead of the function of turning off the subscreen (S5).

In operation S6, it is determined whether the sub-screen is zoomed out.

As a result of the determination (S6), if the zoomed out sub-screen, the display mode is set to zoom out (S7).

On the other hand, if the result of the determination (S6), the sub-screen is not zoomed out, the display mode is set to the sub-screen mode (S8).

In addition, if the sub-screen is not in the off state (S4), the sub-screen is determined to be in an on state to determine the type of the sub-screen (S9).

If the type of the subscreen is the first to fourth quadrants, the border color is set to gray, and the position and size of the subscreen are set according to each quadrant (S10 to S13).

In addition, if the type of the subscreen is Gemstar, the subscreen frame color is set to black, and the size and position are set accordingly (S14).

On the other hand, if the type of the sub picture is channel editing or channel labeling, the size of the sub picture is not reduced, the main picture is reduced to prevent the transient phenomenon, and the border color is set to gray and the position and size are set accordingly (S15 to S). S16).

Next, the input signal of the sub picture is selected (S17). At this time, the sub-screen is applied only when the NTSC signal, the external input signal, the front terminal signal, the DVD, and the HD-STB signal are input.

Then, it is determined whether the state immediately before the sub-screen was zoomed out (S18).

As a result of the determination (S18), if the state immediately before the sub-screen was zoom out, the display mode is set to zoom out (S19).

On the other hand, when the determination result (S18), the state immediately before the sub-screen is not zoomed out, the display mode is set to the sub-screen mode (S20).

Next, the start position of the sub screen is set (S21).

In operation S22, it is determined whether the current mode is the gemsta mode.

Subsequently, when the determination result (S22), the current mode is the Gemstar mode, the sub-screen is instantly turned on (S23).

On the other hand, the determination result (S22), if the current mode is not the Gemstar mode, the sub-screen is gradually turned on at a predetermined time (S24).

As described above, in the method of generating a sub-screen of a digital TV according to the present invention, when a user issues a command of sub-screen on or sub-screen through an OSD of a remote controller or a user interface, the initial variables for program execution are declared. After that, the display control register of the image processor is read to determine the lower 4 bits to determine whether the sub-screen is on or off.

When the sub-screen off command is input, the size is set to 0 instead of the sub-screen is turned off, and it is determined whether the previous state is the sub-screen that has been zoomed out. It is the case that there is a sub picture when it is 3 signal (NTSC signal).

In addition, if the command is to remove the sub-screen in 4: 3 format and then remove it, it will be restored to the previous zoom-out state.If it is in 16: 9 wide spectacle, zoom 1, and zoom 2 state, the command will be returned to the sub-screen state. do.

On the other hand, when the sub-screen on command is input, the type of the sub-screen is determined to determine the type of sub-screen, and when the sub-screen is in the first to fourth quadrants, the border color is set to gray, the position and size of the sub-screen are set, and the gem star In case of, set sub-frame border color to black and set size, position, etc. In case of channel editing and channel labeling, it does not reduce the sub-screen size but can reduce the main screen to prevent transient phenomenon. The color is gray and you set the position and size accordingly.

To select the input source, the sub picture is applied only to 4: 3 input source NTSC signal, external input signal, front terminal signal, DVD, and HD-STB signal. Then, it is checked whether the state immediately before the sub-screen is zoomed out and, if it is the zoom-out state, the state is restored to the zoom-out state.

Also, by setting the first position where the sub-screen is generated, and checking whether it is a Gemstar mode, in the Gemstar mode, the sub-screen is instantly turned on, and in the other mode, the sub-screen is gradually turned on for a predetermined time.

As described above, the method for generating the sub-screen of the digital TV according to the present invention has the following effects.

First, it is possible to improve the satisfaction of viewing to the user by making a border with a comfortable color does not burden the user according to the type of sub-screen.

Second, it is possible to satisfy the needs of consumers by adjusting the speed at which the subscreen is displayed according to the type of subscreen.

Claims (4)

In the sub-screen generation method of the digital TV having an image processing unit, A first step of setting an initial variable for executing a program when a user inputs a sub-screen on / off command and extracting a display control register of the image processor to determine an input command; A second step of initializing a sub-screen size when the sub-screen off command is detected in the extracted display control register and setting a display mode according to whether or not the sub-screen has been zoomed out; A third step of setting a border color, a position, and a size according to the type of the sub-screen when the sub-screen on command is detected in the extracted display control register; Selecting a input signal to be input and setting a display mode according to a state immediately before a sub-screen; And, And a fifth step of setting the start position of the sub-screen and determining a display speed of the sub-screen according to whether or not a predetermined mode is used. The method of claim 1, In the second step Adjusting the subscreen size to 0 instead of a function of turning off the subscreen when the subscreen off command is detected; Determining whether the sub-screen is zoomed out when the sub-screen size is adjusted to 0; Setting a display mode to zoom out if the sub-screen is zoomed out; The sub-screen generation method of the TV, characterized in that the step of setting the display mode to the sub-screen mode if the sub-screen is not zoomed out. The method of claim 1, In the third step If the type of the subscreen corresponds to any one of the first to fourth quadrants, setting the border color to gray, and setting the position and size of the subscreen corresponding to each quadrant; If the type of the sub-screen is Gemstar (Gemstar) and the border color to black, and setting the size and position, And if the type of the sub-screen is channel editing or channel labeling, the border color is grayed out, and the size of the main screen is reduced. The method of claim 1, In the fourth step Selecting an input signal of a sub picture; Determining whether the sub-screen is on in the zoom-out state when the input signal is selected; Setting the display mode to zoom out if the subscreen is on; Setting the display mode to the sub picture mode when the sub screen is off; Setting a start position of the sub-screen; Judging whether the start position of the sub-screen is set to a gemsta mode; Turning on the sub-screen in the gemsta mode in an instant; The sub-screen generation method of the TV, characterized in that the step of turning on the sub-screen slowly if not the gemsta mode.