KR100227111B1 - Sub-picture scanning control apparatus of 2-tuner television - Google Patents

Abstract

The present invention relates to a sub-screen half blanking processing apparatus of a television, wherein the main screen image IF signal and the main screen image and sub-screen image are displayed on the CRT apparatus 34 by the 2-tuner method in the PIP mode. First and second analog-to-digital converters 40 and 48 for digitally converting the sub-screen image IF signals, and first and second sampling units for sampling the digital-converted main screen and sub-screen image IF signals. 42 and 50, a main screen scanning data memory 46 for storing the main screen video signal sampled by the first sampling unit 42 corresponding to the sub screen display area 34a of the CRT apparatus 34; And a main picture processor 44 for generating a control signal for storing the main picture video signal sampled by the first sampling unit 42 in the main picture scanning data memory 46 based on the main picture video IF signal. ), The sample by the second sampling unit 50 A sub-screen scan data memory 54 for storing the ringed sub-screen video signal corresponding to the sub-screen display area 34a of the CRT apparatus 34, and the second sampling unit 50 based on the main screen video IF signal. Sub-screen half blanking processing unit 52, the main screen scanning data memory 46, and the sub-screen generating a control signal for storing the sub-screen video signal sampled by PIP mode by analog-converting the video signal synthesized by the screen synthesizing unit 56 and the screen synthesizing unit 56 for synthesizing the main screen and sub-screen video signals stored in the scanning data memory 54 in the sub-screen display area. And a digital-analog changer (60) for outputting a sub-screen video signal of the sub-screen video data. Wealth recorded The surface video signal is set to 1: 1 ratio, 2: 1 ratio, 3: 1 ratio, or 5: 1 at maximum in the sub-screen display area 34a of the CRT apparatus 34 so that the main screen video signal is displayed in the sub-screen display area. It is to be aware of.

Description

TV half screen blanking processing device

The present invention relates to a sub-screen half blanking processing apparatus of a television, and more particularly, scanning of a sub-screen in a sub-screen area during execution of a main screen and a sub-screen display function executed in a two-tuner television. The present invention relates to a sub-screen half blanking processing apparatus for a television, which can be executed alternately with scanning or every predetermined scan line to minimize the influence of the main screen by the sub-screen.

Recently, in the case of a television which reproduces video and audio of an airborne broadcast signal, a two-tuner method is used to compensate for the fact that only the video of a channel tuned by the 1-tuner method is displayed on the screen of the CRT apparatus as a whole. So that the image of the channel tuned by one tuner is displayed on the main screen of the CRT device while the image of the channel tuned by the other tuner is displayed on the sub-screen defined on the main screen of the CRT device. The 'PIP' method is realized.

Fig. 1 (a) is a block diagram of a conventional two-tuner television having a PIP function, and reference numeral 10 denotes a specific function of all the functions assigned to the corresponding television with a sub-screen display button 10a. Represents a remote controller for inputting selective execution of a function, where 12 is a control unit for controlling execution of a specific function selected by the remote control unit 10, the control unit 12 displaying a sub-screen of the remote control unit 10 When the button 10a is operated, the execution of the PIP function for displaying the main screen and the sub-screen is also controlled. Reference numeral 14 denotes a tuning data memory in which preset tuning data designated to all channels tuneable in the corresponding television is stored.

16 and 18 perform channel selection corresponding to the channel selection data VT1 / VT2 applied from the control unit 12 when the PIP function is set by the sub-screen display button 10a of the remote controller 10. The first and second tuners are shown, and 20 is a voice signal component of a channel tuned by a tuner selected as the main screen among the first and second tuners 16 and 18 by a predetermined intermediate frequency. A SIF module as a voice processing means for processing is shown, and 22 denotes a voice control function (e.g., volume control, voice multiple mode, set in the remote control unit 10 for the voice IF signal IF-converted in the SIF module 20). ---) is executed under the control of the control unit 12 to perform a voice restoration process to be output to the speaker device.

24 denotes a first PIF module as image IF processing means for performing IF conversion processing on a video signal component of a channel tuned by the first tuner 16 by applying a predetermined intermediate frequency IF. A second PIF module as an image IF processing means for performing IF conversion processing on a video signal component of a channel tuned by the second tuner 18 by applying a predetermined intermediate frequency IF, and 28 denotes the remote controller 10. When the PIP function is set by the sub-screen display button 10a of FIG. 2), the sub-screen of the PIP type is activated (EN) by the control of the control unit 12 to convert the image IF signal from the second PIF module 26. The PIP processing unit for abbreviation processing is shown.

In addition, 30 denotes from the first PIF module 24 a video IF signal processed by the first PIF module 24 or a video IF signal abbreviated by the PIP processing unit 28 in the PIP mode. An image processing unit for reproducing the video IF signal in a multi-screen form, 32 indicates an image output unit for outputting the image signal processed by the image processing unit 32 on the CRT apparatus 34, and 36 indicates the remote controller. An OSD processing section for generating an on-screen displuy (OSD) signal indicating an on-screen display of a particular mode set by (10) and an execution state of the mode, wherein the OSD signal processed by the OSD processing section 36 is described above. The image processing unit 30 is applied to the image processing unit 30 and processed in a state where it is mixed at a predetermined position of the image signal to be displayed on the CRT device 34.

In such a configuration, when the sub-screen display button 10a of the remote controller 10 is deactivated and tuning of a specific channel is performed from the remote controller 10 without the PIP function being set, the controller 12 controls the control unit 12. Tuning data for a particular channel is read from the tuning data memory 14 and applied to, for example, the first tuner 16. The audio signal component of the channel tuned by the first tuner 16 is the SIF module 20. IF is processed and applied to the speaker device through the voice processing unit 22 to be reproduced output. In addition, the image signal component of the channel tuned by the first tuner 16 is IF converted by the first PIF module 24 and applied to the image processor 30, in which case the controller 12 The OSD signal for the channel number of the channel target generated by the OSD processing unit 36 is also applied to the image processing unit 30 under the control of), and the mixed image reproduction processing is performed, and the processed image signal is output to the image output unit 32. Through the CRT device 34 is displayed on the full screen.

On the other hand, when the PIP function is set by the sub-screen display button 10a of the remote controller 10 and a specific channel number is designated, the controller 12 selects the channel tuned by the first tuner 16. Assuming that the channel selected under the PIP function is assumed to be a sub picture, the channel selection data of the sub picture channel is read from the channel data memory 14 and applied to the second tuner 18. .

Then, while the image of the channel tuned by the first tuner 16 is displayed on the CRT device 34 by the above-described process, the image signal component of the channel tuned by the second tuner 18 is IF conversion processing is performed in the second PIF module 26 and then applied to the PIP processing unit 28. The PIP processing unit 28 performs an activation control (EN) by the control unit 12 when the PIP function is set, and condenses the image IF signal processed by the second PIF module 26 into a PIP screen form, thereby converting the image processing unit ( 30).

The image processor 30 mixes and processes an image signal applied from the first PIF module 24 and the PIP processing unit 28, the OSD signal for the PIP function and the sub picture channel, and performs a CRT through the image output unit 32. The main screen and the PIP screen (subscreen) 34a are displayed on the CRT apparatus 34 in the form shown in FIG. 1A under the PIP function. In addition, the main screen and the sub-screen of the channel tuned by the first and second tuners 16 and 18 may be changed to the positions of the mutual sub-screen and the main screen by mode adjustment of the remote controller 10.

However, according to the television shown in Fig. 1, the video signals of the channels tuned by the first and second tuners 16 and 18 are set to the main picture and the sub picture (PIP picture) 34a on the CRT apparatus 34. In the case of being displayed in reverse or vice versa, the image processing unit 30 processes the video signal of the sub-screen superimposed on a predetermined position of the video signal of the main screen. The image of the main screen to be displayed is not displayed on the screen, and accordingly, even when an important scene of the main screen is displayed in the display area of the sub-screen image, it becomes impossible to roughly recognize the scene.

In addition, in the case of the two-tuner television shown in FIG. 1 (a), only the channel capable of receiving broadcasts can be searched by the automatic search function provided in the remote controller 10. Under the control of the control unit 12, the preset tuning data registered in the tuning data memory 14 is sequentially applied, for example, by the second tuner 18, so as to check a channel capable of receiving broadcasts, and to the automatic channel searching function. By using the automatic search function, the screen of the main screen is obstructed even though only the channel capable of receiving a broadcast and the contents of a program broadcast on the channel have to be checked.

Accordingly, the present invention has been made in view of the above-described circumstances. For example, when the automatic channel search mode is set, at least a 1: 1 (half blanking) ratio of the sub-screen video signal to the main screen video signal in the display area of the sub-screen is at least two. A sub-screen half blanking processing apparatus of a television for enabling rough observation of a main screen image even in a sub-screen area by alternately or intermittently scanning to maintain a 1: 1 ratio, a 3: 1 ratio, and a maximum 5: 1 ratio. The purpose is to provide.

In order to achieve the above object, according to a preferred embodiment of the present invention, the main screen video IF signal and the main screen video in the PIP mode to display the main screen video and the sub-screen video by the two-tuner method in the CRT apparatus, First and second analog-to-digital converters for digitally converting the sub-screen image IF signals; First and second sampling units configured to sample the digitally converted main and sub picture IF signals; A main screen scan data memory for storing the main screen video signal sampled by the first sampling unit corresponding to the sub screen display area of the CRT apparatus; A main picture processing section for generating a control signal for causing the main picture video signal sampled by the first sampling section to be stored in the main picture scanning data memory based on the main picture video IF signal; A sub-screen scan data memory for storing the sub-screen video signal sampled by the second sampling unit corresponding to the sub-screen display area of the CRT apparatus; A sub-screen half blanking processor for generating a control signal for causing the sub-screen video signal sampled by the second sampling unit to be stored in the sub-screen scan data memory based on the main screen video IF signal; A screen synthesizer for synthesizing the main screen and sub-screen image signals stored in the main screen scan data memory and the sub-screen scan data memory in a sub-screen display area; There is provided a subscreen half blanking processing apparatus for a television comprising a digital-analog changing section for analog-converting a video signal synthesized by the screen synthesizing unit and outputting the analog video signal in the PIP mode.

According to the present invention, the sub-screen video signal recorded in the sub-screen scan data memory with respect to the main screen video signal recorded in the main screen scan data memory has an alternating or intermittent ratio in the sub-screen display area of the CRT apparatus. The alternate scanning ratio is set to 1: 1, and the intermittent scanning ratio is set to 2: 1, 3: 1, and 5: 1 at maximum.

According to the present invention having the above-described configuration, for example, when the automatic channel search function is set by the remote controller, the sub-screen image is alternately (i.e., 1: 1 ratio) with respect to the main screen image only in the sub-screen display area under the control of the controller. By scanning intermittently (ie, 2: 1 ratio, 3: 1 ratio, 5: 1 ratio at maximum), the main screen image can be roughly observed even in the sub-screen display area.

1 (a) is a block diagram of a conventional two-tuner television having a picture-in-picture function;

1 (b) is a view showing the display state of the main screen and the sub-screen by the two-tuner television shown in FIG.

2 is a block diagram of a sub picture half blanking processing apparatus for a television according to a preferred embodiment of the present invention;

FIG. 3A is a diagram showing an example of the configuration of the main screen processing unit and the sub-screen half blanking processing unit shown in FIG. 2;

3 (b) and 3 (c) are views for explaining horizontal and vertical scanning methods of a sub-screen half blanking processing apparatus of a television according to the present invention;

Fig. 3 (d) is a schematic diagram illustrating a sub-screen scanning state by the sub-screen half blanking processing apparatus of the television according to the present invention.

* Description of the symbols for the main parts of the drawings *

10a: sub-display button, 12: control unit,

16,18: first and second tuners, 24,26: first and second PIF modules,

28: PIP processing unit, 30: image processing unit,

32: video output unit, 34: CRT device,

40, 42: first and second digital conversion units, 42, 50: first and second sampling units,

44: main screen processing unit, 46: main screen scanning data memory,

52: sub-screen half blanking processing section, 54: sub-screen scan data memory,

56: screen synthesis unit, 58: analog conversion unit.

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

2 is a block diagram of a sub-screen half blanking processing apparatus of a television according to the present invention. In the figure, reference numeral 40 denotes, for example, a first analog-digital conversion section for digitalizing (first video signal) the video IF signal PIFm from the first PIF module 24 shown in FIG. ADC denotes a first sampling unit for sampling the first image signal digitally converted by the first analog-to-digital conversion unit (ADC) into a predetermined clock signal, and 44 denotes the image IF signal ( Based on PIFm), a main picture processing section for causing data of the first video signal sampled by the first sampling section 42 to be sequentially recorded and read in the main picture scanning data memory 46. FIG. Here, the main screen scanning data memory 46 is used by the main screen processing unit 44 in a sub-screen display area (see '34a' in FIG. 1) in a 1: 1 ratio or 2: 1 ratio for a sub-screen video signal. The data of the first video signal is recorded and then read out so that the 3: 1 ratio or the maximum 5: 1 ratio is maintained.

2, 48 shows, for example, a second analog-to-digital conversion unit (ADC) for digitalizing (sub-image signal) the sub-screen video signal PIFs abbreviated by the PIP processing unit 28, and 50 denotes that. A second sampling unit for sampling the second image signal digitally digitized by the second analog-to-digital converter 48 by the same clock signal as that of the first sampling unit 42, and 52 denotes the PIP processing unit 52. Recording the second video signal (i.e., the sub-screen video signal) to the sub-screen scanning data memory 54 so that half blanking processing of the sub-screen is performed based on the sub-screen video signals PIFs processed in A sub picture half blanking processing unit for reading is shown.

56 is a horizontal / vertical synchronizer for generating the first and second image signals read out from the main screen scan data memory 46 and the sub-screen scan data memory 54 by the horizontal / vertical sync signal generator 58. FIG. A screen synthesizing unit for synthesizing based on a signal (H / Vsync), wherein the screen synthesized by the screen synthesizing unit 56 has a ratio of sub-screen image scanning lines to 1: 1, 2: 1, 3: 1 or 5: 1 maximum. Reference numeral 60 denotes a digital-analog converter for converting the video signal synthesized by the screen synthesizer 58 to an analog converter and applying it to the image processor 30 in FIG.

3A is a diagram showing an example of the configuration of the main screen processor 44. A synchronization detector 62 for detecting a synchronization signal (preferably a horizontal synchronization signal) from the video IF signal PIFm, and A horizontal synchronous counter 64 for counting the detected horizontal synchronous signal, and a divider for generating a vertical synchronous signal by dividing the result counted by the horizontal synchronous counter 64 (for example, 1 / 262.5), ie, a vertical synchronous signal. A generating unit 68; and a vertical synchronizing signal obtained by dividing the result counted by the horizontal synchronizing counter 64 (horizontal synchronizing signal; HC) and the counting result of the horizontal synchronizing counter 64 by the divider 68; A screen area setting unit that defines a sub-screen display area 34a on the CRT device 34 based on VC.

Next, the operation of the sub-screen half blanking processing apparatus of the television according to the present invention having the above-described configuration will be described in detail.

First, when the channel search mode is set from the remote controller 10 while the video signal of the main picture channel is being processed by the process described with reference to FIG. 1A, the controller 12 selects the channel data memory 14. Reads the tuning data for the entire channel and applies it to the second tuner 18 and to enable the enable signal EN to the PIP processing unit 28. Then, the second tuner 18 sequentially executes channel selection, and the video signal components of the broadcast signals of the selected sub-screen channel correspond to the corresponding first and second PIF modules 24 and 26. After the IF conversion process is performed, if the video IF signal of the sub picture channel is processed by the PIP processing unit 28, the main picture video IF signal PIFm processed by the first PIF module 24 is first analog-digital. The sub-picture image IF signal applied to the conversion unit 40 and processed by the PIP processing unit 28 is applied to the second analog-to-digital conversion unit 48 for digital conversion.

The main and sub picture image IF signals digitally converted by the first and second analog-to-digital converters 40 and 48 are sampled by each horizontal line by the first and second sampling units 42 and 50, respectively. 3 (b)). In addition, the main screen and the sub-screen image IF signals are corresponding to the main screen half blanking process by the data recording control signals provided by the main screen processing unit 44 and the sub-screen lower half blanking processing unit 52. The screen scan data memory 46 and the sub-screen scan data memory 54 are stored.

That is, according to the main picture processor 44 and the sub picture half blanking processor 52 capable of adopting the configuration shown in FIG. 3 (a), each image IF signal PIF (PIF; PIFm) is performed by the synchronization signal detector 62. FIG. / PIFs, the horizontal synchronizing signal is detected, and the horizontal synchronizing counter 64 counts the horizontal synchronizing signal and applies the count result Hc to the data recording controller 66. In addition, the count result Hc of the horizontal synchronous counter 64 is applied to the divider 68 to obtain the vertical synchronous signal Vc and to be applied to the data recording control unit 66. Therefore, in the case of the main picture processing section 44, the data recording control section 66 is based on the count result Hc of the horizontal synchronization counter 64 and the vertical synchronization signal Vc from the divider 68. In addition to determining the screen display area (34a in FIG. 1B), a recording control signal Wen is generated in the sub-screen display area so that the main screen image is scanned at a 1: 1 ratio compared to the sub-screen image. In the case of the sub-screen half blanking processing unit 52, the data recording controller 66 scans the sub-screen image at a 1: 1 ratio with respect to the main screen image. The write control signal Wen 'is generated and applied to the sub-screen scan data memory 54. Scanning of the sub-screen image on the main screen image specified by the data recording control unit 66 employed in the main screen processing unit 44 and the data recording control unit 66 employed in the sub-screen half blanking processing unit 52. The ratio is not limited to a 1: 1 ratio, but may be set to a 2: 1 ratio, a 3: 1 ratio, or a maximum 5: 1 ratio if necessary.

Therefore, in the main screen scanning data memory 46, when the scanning ratio with the sub screen area is set to 1: 1 only in the sub screen display area based on the recording control signal Wen applied from the main screen processing unit 44, Main screen image data applied by the first sampling unit 42 is recorded for each scan line of 2n '(n is 0, 2, 4,-, m), and the sub-screen scan data memory 54 stores the main screen image data. When the scanning ratio with the main screen is set to 1: 1 based on the recording control signal Wen 'applied by the sub-screen half blanking processing unit 52, the first and second scanning lines of' 2n + 1 'only in the sub-screen display area. The sub-screen image data applied by the two sampling unit 50 is recorded.

Subsequently, the main screen and sub-screen image data recorded in the main screen scan data memory 46 and the sub-screen scan data memory 54 are read by the screen synthesizing unit 56 to generate a horizontal / vertical synchronous signal generator ( 58 is synthesized in the sub-screen display area by the horizontal and vertical synchronization signals Hsync / Vsync, and the image data on the synthesized sub-screen display area is transferred by the digital-to-analog converter 60. It is analog-converted and applied to the image processing unit 30 as a sub-screen image signal. Accordingly, the image processing unit 30 applies a predetermined position (ie, sub-screen) of the main screen image signal applied by the first PIF module 24. The sub-screen image signal applied by the digital-analog converter 60 is mixed with the display area, and applied to the CRT device 34 through the image output unit 32.

Therefore, in the channel search mode, the sub-screen display area 34 'of the CRT apparatus 34 alternates the main screen image and the sub-screen image based on the vertical scanning period Vs shown in Fig. 3C. 3 (d) of FIG. 3, the image of the main screen can be approximately recognized in the sub-screen display area 34a.

When the scanning ratios recorded in the main screen scan data memory 46 and the sub screen scan data memory 54 are 2: 1, 3: 1, or up to 5: 1, on the sub-screen display area 34a. It is more preferable that the recognition of the main screen image is further increased, and that the display ratio of the sub screen image to the main screen image can be set by the remote controller 10.

On the other hand, the above has been described an example in which the sub-screen half blanking process according to the present invention is applied to the case of channel search, but the application example of the present invention is not limited to such a channel search, but unconditionally when the sub-screen display function is set. It may be executed.

As described above, according to the sub-screen half blanking processing apparatus of the television according to the present invention, the PIP function by causing the sub-screen image to be alternately or intermittently displayed at a constant rate with respect to the main screen image in the sub-screen display area of the CRT apparatus. It is possible to recognize the main screen image in the sub-screen display area at the time of execution.

Claims (4)

In a television in which a main screen image and a sub-screen image are displayed on the CRT apparatus 34 by a two-tuner method in the PIP mode, First and second analog-to-digital converters 40 and 48 for digitally converting the main screen image IF signal and the sub screen image IF signal; First and second sampling units 42 and 50 for sampling the digitally converted main and sub picture IF signals; A main screen scan data memory 46 for storing the main screen video signal sampled by the first sampling unit 42 corresponding to the sub screen display area 34a of the CRT apparatus 34; A main screen processor 44 for generating a control signal for causing the main screen video signal sampled by the first sampling unit 42 to be stored in the main screen scan data memory 46 based on the main screen video IF signal; ; A sub-screen scan data memory 54 for storing the sub-screen video signal sampled by the second sampling unit 50 corresponding to the sub-screen display area 34a of the CRT apparatus 34; A sub-screen half blanking processor for generating a control signal for causing the sub-screen video signal sampled by the second sampling unit 50 to be stored in the sub-screen scan data memory 54 based on the main screen video IF signal ( 52); A screen synthesizer 56 for synthesizing the main screen and sub-screen video signals stored in the main screen scan data memory 46 and the sub-screen scan data memory 54 in a sub-screen display area; The sub-screen half blanking of the television, characterized in that it comprises a digital-analog changer 60 for analog-converting the video signal synthesized by the screen synthesizing unit 56 and outputting the analog video signal in the PIP mode. Processing unit. 2. The sub-screen video signal recorded in the sub-screen scan data memory 54 with respect to the main screen video signal recorded in the main screen scan data memory 46 is a sub-screen of the CRT apparatus 34. A sub-screen half blanking processing apparatus for a television, characterized in that it has an alternating or intermittent ratio in the display area (34a). The method of claim 2, wherein the alternate scanning ratio of the sub-screen video signal with respect to the main screen video signal in the sub-screen display area is set to 1: 1, and the sub-screen video for the main screen video signal in the sub-screen display area. An intermittent half blanking processing apparatus for a television, characterized in that the intermittent scanning ratio of the signal is set to 2: 1, 3: 1, and 5: 1 at maximum. The display device of claim 1, wherein the main screen processor 44 and the sub-screen half blanking processor 52 include a sync signal detector 62 for detecting a horizontal sync signal from the video IF signal, and the sync signal detector 62. A horizontal synchronous counter 64 for counting the horizontal synchronous signal detected by the signal, a divider 68 for dividing the count result of the horizontal synchronous counter 64 to generate a vertical synchronous signal, and the horizontal synchronous count result and the vertical And a data recording control section (66) for generating recording signals for the main picture and sub picture scanning data memories (46, 54) on the basis of a synchronization signal.

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