KR19990016645A - TV subscreen display control device - Google Patents

Abstract

The present invention relates to a sub-screen display control apparatus of a television, in order to selectively display a main screen image and a sub-screen image in the sub-screen area 20a of the CRT apparatus 20. A remote controller 10 for turning on / off the screen display of the sub-screen image in a state where the main screen image and the sub-screen image are alternately transmitted with respect to the video signal to be displayed, and indicating a transmission state of the sub-screen image The sub-screen image ID code detection unit 22 for detecting the sub-screen image ID code, in response to the ON / OFF instruction for the screen display of the sub-screen image, displays the screen of the sub-screen image when the sub-screen image ID code is detected. A sub-screen display processing unit 24 which performs ON / OFF processing of the sub-screen image in the sub-screen area 20a of the CRT apparatus 20 under the control of the control unit 12; ) It is composed.

Description

TV subscreen display control device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-screen display control apparatus for a television, and more particularly, to a sub-screen of a television for allowing a viewer to selectively watch a signal of a sub-screen region edited in a main screen region of a broadcast program by a broadcasting station. It relates to a screen display control device.

In general, a broadcasting station edits and transmits a video signal of a broadcast program to be generally displayed on the entire area of a television CRT apparatus on a receiving side, and accordingly, the receiving side television receives a broadcast program and processes a separate video / audio signal. Through the playback process, the processed image is displayed on the screen of the CRT device and the audio is output through the speaker device.

Preferably, a broadcasting station transmitting a broadcast program to a receiving side allocates a sub screen area having a relatively small dimension to a predetermined position of the main screen area in a video signal of the broadcast program in the form illustrated in FIG. It is appropriately used for realizing two-way screen in sports, sports broadcasting or multi-way broadcasting.

Typically, according to the display process of such a sub-screen, the video signal of the sub-screen area is superimposed while the video screen is displayed on the main screen area of the television CRT apparatus which reproduces the video signal of the broadcast program. When a sub screen is displayed in the screen area, the image of the main screen corresponding to the area of the sub screen is not depicted.

That is, when a sub screen image is displayed in a sub screen region in a video signal of a broadcast program displayed on a television CRT device, the main screen image corresponding to the sub screen region is not depicted, but in general, the sub screen is displayed in the sub screen region. In a state where an image is displayed, the viewer cannot selectively display the sub-screen image displayed on the sub-screen area. In other words, when a sub-screen picture is displayed in a sub-screen area allocated to an appropriate dimension at a predetermined position in the main screen area of the CRT apparatus, the sub-screen is formed at the time of editing a broadcast program at the broadcasting station. It is not possible to select the screen display by the ON / OFF method of the sub screen.

Therefore, the sub-screen image displayed on the CRT apparatus of the television creates an unviewable area of the main screen image, which is disadvantageous to viewers who desire to watch the main screen.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the viewer can selectively display the main screen image inserted into a predetermined position of the main screen image in a broadcast program organized by a broadcasting station by the ON / OFF method. It is an object of the present invention to provide a subscreen display control apparatus of a television capable of a complete viewing effect and a selective screen display of a subscreen.

In order to achieve the above object, according to a preferred embodiment of the present invention, a video IF module for processing a broadcast signal of a specific channel tuned by a tuner as a video IF signal, and a video IF signal from the video IF module is reproduced and processed. In a television having an image processing unit for displaying on a CRT device, the screen display of the sub screen image is turned ON while the main screen image and the sub screen image are alternately transmitted to the image signal to be displayed on the sub screen region. A sub-screen image ID code detecting unit for detecting a sub-screen image ID code indicating a transmission state of the sub-screen image, and a sub-screen image in response to the ON / OFF instruction for the screen display of the sub-screen image; A control unit for turning on / off the screen display of the sub-screen image upon detection of the image ID code, and controlling it in the sub-screen area of the CRT apparatus. Provided is a subscreen display control apparatus for a television including a subscreen display processing section for executing ON / OFF processing of a subscreen picture.

According to the present invention, the sub-screen display processing unit detects a sub-screen area from the video IF signal, a 1-H sampling unit for sampling the video IF signal for each horizontal scan line, and the video IF signal. A synchronization signal separation unit for separating vertical / horizontal synchronization signals, an analog-digital conversion unit for digitizing the 1-H sampling result during a period of a horizontal area detection signal for a sub-screen area based on the horizontal synchronization signal, and the digital conversion A data memory storing the stored image data, a scan line counter generating a scan line count result by counting the horizontal sync signal over a period of a vertical sync signal, and a result of the scan line counter in response to a sub-screen display control signal from the controller. Sub-screen display control signal generation for controlling the reading of the image data stored in the data memory on the basis of And a data synthesizing unit for synthesizing the video data read out from the data memory and outputting it as an analog signal through a digital-analog converting unit.

The data memory may include a plurality of first-n-th line data memory areas in which main screen image data and sub-screen image data, which are organized with respect to the sub-screen area, are stored correspondingly.

According to the apparatus for controlling a sub-screen display of a television according to the present invention having the above-described configuration, a broadcasting station processes and transmits a video signal so that a main screen video and a sub-screen video are alternately transmitted in the sub-screen area when editing a broadcast program. In the television, only the main screen image can be displayed or the main screen and the sub screen can be simultaneously displayed according to the selection by the remote controller.

1 is a view for explaining a display state of a sub-screen executed in a CRT apparatus of a television according to a conventional example;

2A is a schematic block diagram of a television to which a sub-screen display control apparatus according to the present invention is applied;

FIG. 2B is a diagram showing the configuration of the sub-screen display processing unit shown in FIG. 2A;

3A to 3C are views for explaining a sub screen display process on a CRT device by the sub screen display device of a television according to the present invention;

4A and 4B are views for explaining a display example and a sub-screen display example of the main screen on the CRT apparatus executed by the sub-screen display apparatus of the television according to the present invention.

* Explanation of symbols for main parts of the drawings

10: remote control, 12: control unit,

20: CRT device, 22: sub picture ID detection unit,

24: sub screen display processing unit, 240: sub screen area detection unit,

242: 1-H sampling unit, 244: synchronization signal separation unit,

248: data memory, 250: scanning line counter,

252: data synthesizing unit, 256: sub-screen display control signal generating unit.

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

2A is a diagram showing a main block configuration of a television to which a sub-screen display control apparatus according to a preferred embodiment of the present invention is applied. In the figure, reference numeral 10 denotes a remote controller for selectively executing the overall functions of the corresponding television, and preferably, the remote controller 10 has a selective function according to the ON / OFF method of the sub-screen assumed in the present invention. A sub picture selection function for instructing display is provided. 12 represents a control unit for controlling to execute a specific television function selected by the remote control unit 10, and the control unit 12 controls the sub screen area when ON / OFF of the sub screen is selected by the remote control unit 10. FIG. The video signal controls the removal of the video signal in the screen display or sub-screen area.

14 denotes a tuner for executing channel tuning corresponding to the channel selection data VT applied under the control of the control unit 12 for a specific channel selected by the remote controller 10, and 16 denotes a tuner ( FIG. 14 shows an image IF module for IF conversion processing by applying a predetermined intermediate frequency (IF) to the broadcast program signal of the channel tuned by (14), and 18 denotes an image signal subjected to IF conversion processing by the image IF module 16. An image processing unit which reproduces the R / G / B signals and displays them on the CRT apparatus 20 is shown. Here, as is well known, when the sub-screen image is transmitted in a form mixed with the main screen image and the main screen image of a broadcast program edited by a broadcasting station, the CRT apparatus 20 corresponds to the sub-screen region corresponding to the sub-screen image. 20a is set.

In addition, 22 denotes a sub-screen picture ID detection unit for detecting a sub-screen picture ID code indicating a state where a broadcast station is transmitted in a state in which a sub-screen picture is mixed in a main screen picture according to the present invention, and 24 is the sub-screen picture ID. When the detection result of the sub screen image ID code is applied to the control unit 12 by the detection unit 22, the control unit 12 is activated by the control unit 12 according to the setting state of the sub screen ON / OFF function of the remote controller 10. A sub screen display processing unit for displaying or not displaying a screen image.

FIG. 2B is a block diagram showing an example of the configuration of the sub-screen display processing section 24. Reference numeral 240 denotes a sub-screen area (i.e., FIG. 2A) in the video IF signal IF provided from the video IF module 16. FIG. The sub-screen area detection unit for detecting '20a' of the CRT device 20 shown in the drawing shows that the sub-screen area detection unit 240 generally has a sub-screen area 20a designated on the CRT device 20. For example, the subscreen area 20a is filtered by a color filter in consideration of the area defined by a white level or a specific color level, and then the horizontal area detection signal is executed by performing a horizontal count of the subscreen area 20a. In addition to providing (Vdc), it is configured to provide a vertical area detection signal (Hdc) by counting the scanning player in the vertical direction of the sub screen area (20b).

In FIG. 2B, reference numeral 242 denotes a 1-H sampling unit for sampling one horizontal scanning line of an image signal to be displayed on the CRT apparatus 20, and 244 denotes a horizontal synchronization signal Hsync in the image IF signal. A synchronous signal separator for separating the vertical synchronous signal Vsync, and 246 denotes a horizontal synchronous signal provided by the synchronous signal separator 244 for sampling data of 1H units sampled by the 1-H sampling unit 242. Analog-digital digital conversion for a period corresponding to the horizontal area detection signal Hdc of the sub-screen area 20a of the CRT apparatus 20 detected by the sub-screen area detection unit 240 based on (Hsync). The conversion part ADC is shown.

In addition, in FIG. 2B, 248 indicates a data memory for storing digital data in the sub screen area 20a converted by the analog-digital converter 246. The data memory 248 preferably represents the sub screen. The first line data memory area-the nth line data memory area are configured to store data of the horizontal scan line included in the area 20a in line units. In addition, 250 denotes a scan line counter that counts the horizontal sync signal Hsync provided by the sync signal separator 244 at a period of the vertical sync signal Vsync to generate a count result of the scan line, and 252 denotes the sub screen area. Represents a data synthesizing unit for synthesizing line data read from the data memory 248 in the sub picture area 20a indicated by the vertical area detection signal Vdc of the sub picture area 20a provided by the detection unit 240. 254 denotes a digital-analog conversion unit for analog-converting the data synthesized by the data synthesis unit 252.

In addition, in FIG. 2B, reference numeral 256 is activated and controlled by the control signal CS applied from the control unit 12 according to ON / OFF of the sub-screen display indicated by the remote controller 10, so that the scan line counter 250 A sub-screen display control signal generator for generating a read control signal Ad of line data stored in the first to nth line data memory areas defined in the data memory 248 based on the scan line count result applied from Indicates.

Preferably, when a broadcast program provided from a broadcasting station is processed and transmitted alternately in the sub-screen area 20a, the video of the main screen and the video of the sub-screen are displayed. When the OFF function of the sub screen image is set so that the main screen image is displayed in the sub screen region 20a, for example, in the remote controller 10, only the scan line data of the main screen image is displayed in the sub screen region 20a. While the read control signal Rad is generated to be read from the memory 248, the ON function of the sub-screen image is set so that the sub-screen image is displayed in the sub-screen area 20a in the remote controller 10, for example. In this case, the read control signal Rad is generated such that only the scan line data of the sub screen image is read from the data memory 248 in the sub screen region 20a. .

Next, the operation of the sub-screen display control apparatus of the television according to the present invention having the above-described configuration will be described in detail with reference to Figs.

According to the present invention, preferably, when a broadcast station requires a sub-screen editing process on a main screen, at least in the sub-screen area 20a of the CRT apparatus 20, the video of the main screen and the video of the sub-screen are alternately line by line. In the sub screen area 20a of FIG. 3A, for example, the nth line, the n + 2th line, the ---, and the n + mth lines are the main screen image line; the n + 1th line, the n + 3th line Line, ---, n + (m-1) lines are transmitted to the sub picture image line).

In this state, when tuning of a specific channel is performed from the remote controller 10, the control unit 12 applies tuning data VT for the channel to be tuned to the tuner 14 so that channel tuning is performed. The broadcasting signal of the channel tuned by the tuner 14 is applied to the image processing unit 18 after the IF conversion processing by the predetermined image IF signal is performed by the image IF module 16, and then the image processing unit 18 In this case, the video IF signal is reproduced by the R / G / B signal and applied to the CRT device 20 for display.

In this case, the main screen image and the sub-screen image are alternately edited and transmitted line by line at the position corresponding to the sub screen area 20a of the CRT apparatus 20 in the video signal of the broadcast program broadcast by the broadcasting station of the tuned channel. In addition, when the sub screen image ID code is transmitted in, for example, the video blanking period (ie, the vertical retrace period) of the video signal, the sub screen image ID detecting unit 22 detects the detection result of the sub screen image ID code. ) Is applied.

Then, the control unit 12 applies a control signal CS to the sub-screen display control signal generator 256 of the sub-screen display processing unit 24, and in the state, the sub-screen area detection unit 240 Detection of the sub picture area 20a on the CRT apparatus 20 is performed. That is, the sub screen area detection unit 240 generally uses the color filter in consideration of the fact that the sub screen area 20a has a constant color level (ie, a white level or a specific color level) to distinguish the main screen area. The color filtering result is counted in the horizontal and vertical directions to provide the horizontal area detection signal Hdc (see FIG. 3B) and the vertical direction detection signal Vdc. In addition, the 1-H sampling unit 242 samples the image signal in units of horizontal lines, and the synchronization signal separator 244 performs the horizontal synchronizing signal Hsync and the vertical synchronizing signal Vsyn in the image signal. Will be provided separately.

Accordingly, the analog-digital converter 246 transmits the horizontal video signal of the horizontal scan line unit sampled by the 1-H sampling unit 242 to the horizontal synchronous signal Hsync provided by the synchronization signal separator 244. On the basis of this, the digital screen is digitally converted in the period of the horizontal area detection signal Hdc of the sub screen area 20a from the sub screen area detection unit 240 and applied to the data memory 248. The main screen image / sub-screen image data in the sub screen area 20a to be applied to the sub screen area 20a is stored in the corresponding first to n-th line data memory areas.

In this case, the control signal CS related to ID code detection related to the transmission of the sub screen image applied by the control unit 12 is applied to the sub screen display control signal generation unit 256, and the sub screen display control is performed. The signal generator 256 may generate the data memory according to the count result of the scan line counter 250 that counts the horizontal sync signal Hsync in the period of the vertical sync signal Vsync separated by the sync signal separator 244. Readout for the line data memory area (i.e., n + 1, n + 3 lines, ---, n + (m-1) line data memory areas) in which the sub picture image data defined in 248 is stored. The signal Rad is generated. Accordingly, the sub-combination image data read out from the n-th + 1th, the n + 3th line, the-, and the n + (m-1) th line data memory areas of the data memory 248 is, for example, the data synthesizing unit 252. The data synthesis is performed during the period of the vertical area detection signal Vdc applied to the sub screen area detection unit 240 to define a vertical area of the sub screen area 20a. The result of is executed only for the sub picture. Accordingly, sub-screen image data corresponding to the sub-screen area 20a synthesized by the data synthesizing unit 252 is analog-converted by the digital-analog converting unit 254 and applied to the image processing unit 18. In the CRT apparatus 20, a main screen image is displayed in the main screen region, and a sub screen image is displayed in the sub screen region 20a (see FIG. 4A).

On the other hand, when OFF of the sub screen image is instructed by the remote controller 10, the control unit 12 controls the erasing of the sub screen to the sub screen display control signal generation unit 256 (CS). Accordingly, the sub-screen display control signal generation unit 256 stores a line data memory area (for example, nth, n + 2,-) in which the main screen image data is stored in the data memory 248. A read control signal Rad is applied to the n + mth line data memory area. Accordingly, main screen image data read out from the n-th, n + 2, ---, and n + m-th line data memory areas of the data memory 248 is applied to the data synthesizing unit 252 to perform the above-described data. It is obtained as main screen image data to be displayed in the sub screen area 20a through the synthesis process (see FIG. 3B), and the main screen image data is analog-converted by the digital-analog conversion unit 254 to perform the image processing unit 18. ), And the main screen image processed by the image processor 18 is also displayed on the sub screen area 20a of the CRT apparatus 20 in place of the sub screen image (see FIG. 4B).

As described above, according to the sub-screen display control apparatus for television according to the present invention, the main screen image and the sub-screen image are alternately transmitted for each horizontal scan line in the sub-screen area with respect to the video signal of the broadcast program edited by the broadcasting station. In this case, the viewer can selectively display the sub-screen image or the main screen image, thereby eliminating the cause of deterioration of the main screen image caused by the fixed display of the sub-screen image. do.

Claims (4)

A video IF module 16 for processing the broadcast signal of a specific channel tuned by the tuner 14 as a video IF signal, and a video IF signal from the video IF module 16 is reproduced and displayed on the CRT apparatus. In a television equipped with an image processing unit 18, A remote controller 10 for turning on / off the screen display of the sub screen image while the main screen image and the sub screen image are alternately transmitted with respect to the image signal to be displayed in the sub screen region; A sub-screen picture ID code detecting unit 22 for detecting a sub-screen picture ID code indicating a transmission state of the sub-screen picture; A control unit 12 for turning on / off the screen display of the sub-screen image upon detection of the sub-screen image ID code in response to the ON / OFF instruction for the screen display of the sub-screen image; And a sub-screen display processing unit (24) for performing ON / OFF processing of the sub-screen image in the sub-screen area (20a) of the CRT apparatus (20) under the control of the control unit (12). Sub display control device. The display apparatus of claim 1, wherein the sub-screen display processing section 24 includes a sub-screen area detection unit 240 for detecting a sub-screen area from the video IF signal, and 1-H sampling for sampling the video IF signal for each horizontal scan line. A 242, a synchronous signal separator 244 for separating a vertical / horizontal synchronous signal from the image IF signal, and the 1-H sampling for a period of a horizontal region detection signal for a sub picture area based on the horizontal synchronous signal. An analog-to-digital converter 246 for digitalizing the result, a data memory 249 for storing the digitally converted image data, and a scan line counter for counting the horizontal synchronization signal over a period of the vertical synchronization signal to generate a scan line count result. 250, in response to the sub-screen display control signal from the controller 12, controlling reading of the image data stored in the data memory 248 based on the scan line count result. A sub-display display control signal generator 256 and a data synthesizer 252 for synthesizing the image data read out from the data memory 248 and outputting the analog data through the digital-analog converter 254 as an analog signal. A sub-screen display control apparatus for a television, which is configured. 2. The data storage system of claim 1, wherein the data memory 248 includes a plurality of first-n-line data memory areas in which main screen image data and sub-screen image data organized with respect to the sub-screen area are stored correspondingly. A sub-screen display control apparatus for a television. The sub-screen image is selectively displayed on the sub-screen area when the sub-screen image to be displayed on the sub-screen area 20a of the CRT apparatus 20 is turned on. And a main screen image is selectively displayed in the sub screen region when the sub screen image is turned off.