KR100677749B1 - PIP Display Control System - Google Patents

Abstract

The present invention relates to a PIP display control system, comprising: a main video processing circuit for processing a received main broadcast signal in a state that can be displayed on a main screen, and a PIP video for processing a received PIP signal in a state that can be displayed on a PIP screen A video signal synthesizing unit for synthesizing the main video signal and the PIP video signal processed by the processing circuit, the main video processing circuit and the PIP video processing circuit, and adjusting the synthesis ratio between the main video signal and the PIP video signal, and the output of the PIP screen. If a subtitle display is selected, the video signal synthesizing unit includes a control unit for controlling the synthesis ratio between the main video signal and the sub video signal. Thus, when displaying the subtitles while the PIP screen is displayed, the transparency of the PIP screen is adjusted so that the main screen of the area where the PIP screen is placed is viewed, such as the main screen image or the subtitle of the area where the PIP screen is placed. You can watch important information.

Digital TV, PIP, Subtitles, Alpha Blending, Transparency

Description

PIPL SYSTEM OF DISPLAY FOR PICTURE IN PICTURE}

1 is a block diagram of a PIP display control system according to the present invention;

2 is a main screen on which a PIP screen is displayed;

3 is a main screen displaying a PIP screen with transparency adjusted according to the present invention;

4 is a flowchart illustrating a PIP transparency adjustment process by the PIP display control system of FIG. 1.

Explanation of symbols on the main parts of the drawings

10: main signal processing block 11: main tuner

13: main audio processing circuit 15: main audio amplifier

23: main video processing circuit 33: data slicer

35: caption signal processor 40: PIP signal processing block

41: auxiliary tuner 43: PIP video processing circuit

48: PIP audio processing circuit 49: PIP audio amplifier

50: control unit 60: video signal synthesis unit

65: alpha blending module

The present invention relates to a PIP display control system, and more particularly, to a PIP display control system that prevents important information such as a subtitle from being blocked by displaying a PIP screen transparently or semi-transparently while displaying a subtitle. It is about.

Recently, with the development of TV technology, TVs having various functions are being developed according to a user's purpose of use. The main functions include Korean / English subtitle function, PIP (PICTURE IN PICTURE) function, automatic image control function, reception sensitivity amplification function, and energy saving function.

Among them, the reception sensitivity amplification function (LNA) provides a more stable and clearer image, and the energy saving function saves electricity by lowering standby power consumption to zero by a built-in power saving switch.

The PIP function displays a separate PIP screen in which the video signal is compressed horizontally and vertically on the main screen. The PIP screen may display the same channel or a different channel as the main screen. Can display an image from an external input device. Therefore, using the PIP function, you can watch two channels at once or watch a video or DVD while watching TV.

On the other hand, the caption function is to display the subtitles, such as Korean or English on the TV screen, which is helpful to the deaf or language learner. In order to perform the caption function, the broadcasting station inserts and transmits character information corresponding to the audio signal at a specific position of the video signal. Then, the TV on the receiving side separates the text signal from the video signal through a text broadcasting decoder, decodes the text signal, recombines the text signal with a video signal subjected to a separate decoding process, and displays it on the TV screen. Accordingly, the text signal is displayed superimposed on a part of the main screen.

However, when the PIP function and the subtitle function are executed at the same time, the PIP screen and the subtitle are overlapped, and thus an important part of the subtitle or main screen may be hidden. Of course, in this case, the user may move the PIP screen so that the subtitles are not obscured, but the viewer may have to move the PIP screen according to the position of the subtitles whenever the subtitles are displayed.

In order to solve this problem, Korean Patent Publication No. 2001-4144, "Method for Display Display Control of Subtitle Broadcast in Picture-in-Picture Mode," selects a subtitle signal of a main / sub broadcast according to a user's selection in the picture-in-picture mode. And the display position of the caption signal is adaptively determined according to the display position of the PIP screen. To this end, in the PIP mode, the subtitle display coordinate table in which the respective coordinate values are set so that the position of the subtitle and the position of the PIP screen do not overlap is stored in advance in the memory. When the PIP mode and the subtitle display mode are simultaneously executed, the coordinate values of the subtitles set as default values in the PIP mode are read from the subtitle display coordinate table to display the subtitles at the corresponding positions. When the subtitle is hidden by the PIP screen even when the subtitle is arranged in the default position, the user can select a function of rotating the PIP screen. Then, each coordinate value for the position where the PIP screen and the subtitle do not overlap is extracted from the subtitle display coordinate table to move the subtitle to the corresponding position. Accordingly, the PIP screen and the subtitles may not overlap.

However, in this prior art, in order to arrange the PIP screen and the subtitle so that they do not overlap, by changing the position of the subtitle, the main screen is obscured by the PIP screen and the subtitle at the same time, and the area of the main screen which can be actually watched is drastically reduced. Done. Therefore, the probability that the PIP screen or the subtitle is obscured for a part of the broadcast that is viewed through the main screen increases the probability of user inconvenience. In addition, since the coordinate values of the mutually proper PIP screen and the position of the subtitle must be input to the subtitle display coordinate table one by one, it is not only cumbersome, but also it is difficult to adaptively change the position of the PIP screen according to the change of the subtitle length. Not easy is obvious.

Therefore, when the PIP mode and the subtitle mode are output at the same time, it is possible to prevent the PIP screen from overlapping the subtitles and not view the subtitles, and to prevent the main screen from being excessively blocked by the PIP screen and the subtitles. You need to find a way to do it. To this end, in the present invention to be described later, when the subtitles are displayed, the PIP screen is displayed transparently or semi-transparently, thereby preventing the subtitles from being blocked by the PIP screen, and the main screen can be viewed even when the PIP screen and the subtitles are displayed. Make sure you have enough space.

 Accordingly, an object of the present invention is to display the PIP screen transparently when the PIP screen and the subtitles are displayed at the same time, thereby preventing the subtitles from being blocked by the PIP screen, and at the same time the main screen even when the PIP screen and the subtitles are displayed. It is to provide a PIP display control system for viewing the video.

The configuration of the present invention for achieving this object, the main video processing circuit for processing the received main broadcast signal in a state that can be displayed on the main screen; A PIP video processing circuit for processing the received PIP broadcast signal in a state that can be displayed on a PIP screen; A video signal synthesizing unit for synthesizing the main video signal and the PIP video signal processed by the main video processing circuit and the PIP video processing circuit, and adjusting a synthesis ratio between the main video signal and the PIP video signal; When the caption display is selected from the output of the PIP screen, the video signal synthesizing unit includes a control unit for controlling to adjust the synthesis ratio of the main video signal and the PIP video signal.

The video signal synthesizing unit may include an alpha blending module configured to adjust a synthesis ratio between the main video signal and the PIP broadcast signal.

Preferably, the controller operates the alpha blending module when the caption display is selected.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a PIP display control system according to the present invention. The PIP display control system includes a main signal processing block 10, a PIP signal processing block 40, a video signal synthesizing unit 60, and a control unit 50.

The main signal processing block 10 is for processing the main broadcast signal displayed on the main screen, and includes a main tuner 11, a main audio processing circuit 13, a main video processing circuit 23, and a main audio amplifier 15. And a data slicer 33 and a caption signal processor 35 for processing the caption signal received and included in the main broadcast signal.

The main tuner 11 receives a main broadcast signal by tuning to a frequency corresponding to a specific broadcast channel selected by a user. The main audio processing circuit 13 processes the main audio signal in the main broadcast signal to be output through the speaker, and the main audio amplifier 15 outputs the main audio signal processed by the main audio processing circuit 13 to an appropriate output. Amplify. The main video signal processing circuit processes the main video signal in the main broadcast signal in a state that can be displayed on the main screen of the display unit.

The data slicer 33 counts a horizontal synchronization signal from the main video signal received through the main tuner 11, finds a caption signal, and separates it using a masking pulse. In general, the caption signal is carried on the 21st line of the first field and the 284th line of the second field of the main video signal. The caption signal processing unit 35 reads font graphic data corresponding to the character data of the caption signal from the internal font memory, and outputs R, G, and B character graphic signals to the character color and the caption position corresponding to the character data.

On the other hand, the PIP signal processing block 40 is a block for processing a PIP broadcast signal for displaying a PIP screen, and includes an auxiliary tuner 41, a PIP video processing circuit 43, a PIP audio processing circuit 48, and a PIP. An audio amplifier 49. Like the main tuner 11, the auxiliary tuner 41 receives the PIP broadcast signal by tuning to a frequency corresponding to the broadcast channel for the PIP screen selected by the user. The PIP audio processing circuit 48 processes the PIP audio signal in the PIP broadcast signal in a state capable of being output to a second output device other than a speaker such as headphones or earphones, and the PIP audio amplifier 49 is a PIP audio processing circuit 48. Amplify the PIP audio signal processed by XT to an appropriate output size. The PIP video processing circuit 48 compresses and outputs the PIP video signal in accordance with the size of the PIP screen of the display unit.

The video signal synthesizing unit 60 synthesizes the main video signal and the PIP video signal among the main broadcast signal and the PIP broadcast signal to output a main screen including the PIP screen. The video signal synthesizing unit 60 includes an alpha blending module 65 that adjusts the synthesis ratio in synthesizing the main video signal with the PIP broadcast signal.

The alpha blending module 65 adjusts the composition ratio in synthesizing the main video signal and the PIP broadcast signal, and includes a plurality of muxes. In the alpha blending module 65, the combination value of the main video signal and the PIP video signal is adjusted by using the α value, the main video signal is multiplied by the α value, and the PIP video signal is multiplied by the 1-α value to add the two values. You can get alpha blended output. When the composition ratio is adjusted in this way, the transparency of the PIP screen can be changed, so that the main screen hidden by the PIP screen can be seen. Transparency is determined by the α value set in advance by the manufacturer, but a transparency control menu can be added to the PIP menu so that the user can directly control it. In this case, the transparency can be configured to be adjusted in several to several tens of steps between 0% of the PIP screen is completely transparent and 100% of the opacity of the main screen is not visible at all.

The controller 50 controls the operation of the main signal processing block 10, the PIP signal processing block 40, and the video signal synthesizing unit 60 to control the output of the main screen and the PIP screen. When the user selects the output of the PIP screen, the controller 50 controls the auxiliary tuner 41, the PIP video processing circuit 43, the PIP audio processing circuit 48, the PIP audio amplifier 49, and the video signal synthesizing unit. By operating 60 to process the PIP broadcast signal, the PIP screen is output to a certain position of the main screen. At this time, the alpha blending module 65 does not operate. Accordingly, since the PIP screen is in an opaque state, the main screen where the PIP screen is located cannot be viewed. On the other hand, if the user selects the output of the subtitles during the output of the PIP screen, the controller 50 operates the alpha blending module 65 to adjust the composition ratio of the PIP video signal and the main video signal, thereby making the PIP screen transparent. Or translucent. At the same time, the controller 50 operates the data slicer 33 and the caption signal processor 35 to process the caption signal and output it to the main screen. That is, when the caption signal and the PIP broadcast signal are output at the same time, the controller 50 adjusts the transparency of the PIP screen so that the caption can be viewed even when the PIP screen is displayed.

An operation process of the PIP display control system having such a configuration will be described below with reference to FIGS. 2 to 4.

When the power is supplied and the main broadcast signal is input through the main tuner 11, the controller 50 operates the main video processing circuit 23 to output the processed main video signal to the main screen 70, and the main The audio processing circuit 13 and the main audio amplifier 15 are operated to output the processed main audio signal through the speaker.

When the user selects the PIP mode while the main screen 70 is being displayed (S110), the controller 50 operates the auxiliary tuner 41 to receive the PIP broadcast signal in association with the channel selected by the user ( S120). Then, the controller 50 operates the PIP video processing circuit 43 to compress and output the PIP video signal to fit the size of the PIP screen 80 (S130). The controller 50 operates the PIP audio processing circuit 48 and the PIP audio amplifier 49 to process the PIP audio signal and output the same through the earphone or the headphone. Accordingly, as shown in FIG. 2, the PIP screen 80 is output to one side of the main screen 70.

When the user selects the caption mode while the PIP screen 80 is being displayed (S140), the controller 50 operates the data slicer 33 and the caption signal processor 35 to display the caption signal on the main screen ( 70) to enable output to

At the same time, the controller 50 operates the alpha blending module 65 of the video signal synthesizing unit 60 to adjust the synthesis ratio between the main video signal and the PIP video signal in the PIP screen 80 (S150). . At this time, the composition ratio is set in advance, but by allowing the user to input the desired composition ratio, it is possible to output the PIP screen 80 having a degree of transparency desired by the user.

When the transparency of the PIP screen 80 is adjusted in this way, the controller 50 outputs the subtitles to the main screen 70 (S160). At this time, since the PIP screen 80 is transparent or translucent, as shown in FIG. 3, the information displayed on the main screen 70 can be viewed even in the region where the PIP screen 80 is generated. Therefore, the user can read the subtitle displayed on the PIP screen 80 area even when the PIP screen 80 is displayed.

As described above, when the PIP display control system is used, when the caption mode is selected while the PIP screen 80 is displayed, by adjusting the transparency of the PIP screen 80, the main screen of the area where the PIP screen 80 is disposed Allow 70 to watch. Therefore, by preventing the main screen 70 from being excessively blocked by the subtitles and the PIP screen 80, important information such as the main screen 70 image or the subtitle of the area where the PIP screen 80 is disposed can be viewed. have. In addition, the user does not have to turn off the PIP screen 80 to watch the subtitles, so that the user can be convenient.

As described above, according to the present invention, when the caption mode is selected while the PIP screen is displayed, the transparency of the PIP screen is adjusted so that the main screen of the area where the PIP screen is disposed can be viewed. Therefore, by preventing the main screen from being excessively blocked by the subtitles and the PIP screen, it is possible to watch important information such as a main screen image or a subtitle of the area where the PIP screen is arranged.

Further, in the detailed description of the present invention, specific embodiments have been described, which should be taken as exemplary, and various modifications may be made without departing from the technical spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

Claims (3)

A main video processing circuit for processing the received main broadcast signal in a state capable of displaying on the main screen; A PIP video processing circuit for processing the received PIP broadcast signal in a state that can be displayed on a PIP screen; A video signal synthesizing unit for synthesizing the main video signal and the PIP video signal processed by the main video processing circuit and the PIP video processing circuit, and adjusting a synthesis ratio between the main video signal and the PIP video signal; And a controller configured to control the video signal synthesizing unit to adjust a synthesis ratio between the main video signal and the PIP video signal when the caption display is selected during the output of the PIP screen. The method of claim 1, The video signal synthesizing unit includes an alpha blending module configured to adjust a synthesis ratio between the main video signal and the PIP broadcast signal. The method according to claim 1 or 2, And the control unit operates the alpha blending module when selecting the caption display.

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