KR100225337B1 - Half-blanking control apparatus of on-screen display signal - Google Patents

Abstract

The present invention relates to an OSD half blanking processing apparatus for a television, wherein the illuminance detection unit 24 or the ABL current level generating a difference signal is detected by comparing the peripheral illuminance detected by the first and second illuminance detection sensors with a reference illuminance. The difference signal under the control of the control unit 12 and the control unit 12 for controlling reading of horizontal scan data in the OSD half blanking area based on the difference signal or the ABL current detection value. OSD half blanking scan data setting unit 26 for outputting OSD scan line data corresponding to the OSD signal generated by the OSD processing unit 18 by OSD scan line data output from the OSD half blanking scan data setting unit 26. And a half blanking scan line determiner 28 for determining an output timing of the OSD. By properly adjusting the number of horizontal scan lines, the sharpness of the original video signal is increased even in the OSD half blanking area.

Description

OSD Half Blanking Processing Unit for Television

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OSD half blanking processing apparatus for a television. More particularly, the present invention relates to an OSD half blanking processing apparatus, and more particularly, to adjust the number of scanning lines for OSD characters on-screen display (ADB) adaptively to the ambient light intensity or the ABL (Auto-brightness limit) current level. The present invention relates to an OSD half blanking processing apparatus for a television, which is set variably so that the clarity of the original video signal is increased.

In general, in the case of a television which reproduces a video / audio signal transmitted from a broadcasting station according to a specific function selected by the viewer or, for example, reproduces an external video / audio signal, it informs the selection state of the specific function selected by the viewer. In order to display the OSD characters on the screen of the CRT device, the system has an OSD processing function.

FIG. 1 is a block diagram showing an OSD processing system applied to a general television. Reference numeral 10 denotes a remote controller for setting a specific function desired by a viewer among overall functions added to a corresponding television. A control unit for controlling the generation of OSD characters for screen guidance of the function selected by the remote control unit 10 as well as executing control for a specific function selected from < RTI ID = 0.0 > 10). ≪ / RTI >

In FIG. 1, reference numeral 14 denotes an image IF processor PIF for converting IF by applying a predetermined intermediate frequency to the composite video signal RF of a channel selected under the control of the controller 12. A video IF signal applied by the video IF processor 14 is subjected to reproduction processing and applied to a CRT apparatus (not shown) as an R / G / B signal so that an image corresponding to the R / G / B color signal is reproduced on the screen. An image processing unit is shown.

In addition, 18 is an OSD signal corresponding to the OSD control signal applied from the control unit 12 to generate the OSD signal based on the horizontal / vertical synchronous signal (H / Vsync) of the video signal applied from the synchronization signal detection unit 20 An OSD processing unit for applying a signal to the image processing unit 16 is shown. The image processing unit 16 includes the OSD signal applied by the OSD processing unit 18 at a predetermined position of the image IF signal and outputs the same. The OSD signal is displayed at a predetermined position.

Therefore, in the television having the above-described configuration, in the state where the image IF signal processed by the image IF processing unit 14 is applied to the image processing unit 16, the control unit 12 selects a specific function of the remote controller 10. When a control signal for generating an OSD signal is applied to the OSD processing unit 18, the OSD processing unit generates an OSD text signal corresponding to the control signal, so that the synchronization signal detecting unit 20 controls the control unit 12. The image processing unit 16 is applied to the image processing unit 16 according to the detected horizontal / vertical synchronization signal H / Vsync, and the image processing unit 16 reproduces the image IF signal and is applied to the OSD processing unit 18. The OSD signal is positioned, reproduced, and output to the CRT device. Thus, the OSD signal is displayed on the CRT device at a predetermined position of the video signal so that the viewer can view it. All.

However, in the case of the television illustrated in FIG. 1, when an image including an OSD character processed by the OSD processor 18 is displayed on the CRT device, when the color level of the screen position of the CRT device on which the OSD character is displayed is high. OSD character identification becomes difficult. In view of this, in recent years, a method has been proposed for detecting the color level of the screen area in which the OSD text is displayed and displaying the OSD text in the complementary color level of the color level. By detecting the color level of the screen area on which the text is displayed and performing half-blanking processing based on the complementary color level of the detected color level, the recognition of the OSD text is improved.

In addition, such OSD half blanking processing detects the position of the OSD character for OSD characters (i.e., subtitles) included in a video signal transmitted from a broadcasting station, for example, and performs half blanking processing by a predetermined color on the OSD characters. As a result, a technique for increasing the awareness of the OSD subtitles has been proposed.

However, according to the half blanking processing method of the OSD character, when the OSD signal provided from the OSD processing unit (ie, '18' in FIG. 1) is applied to the image processing unit 16, the image processing unit 16 inserts the OSD signal. The OSD signal is superimposed on the original video signal at the position where it is to be reproduced, so that the original video signal is not displayed to the viewer by the OSD half blanking process. Thus, there is a disadvantage that the original video signal is concealed by the OSD half blanking area so that the viewer cannot observe the important original video signal concealed by the OSD half blanking area.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its main object is to detect the ambient illumination of a television and to adaptively set the scan player in the OSD half blanking area to the original video signal by adaptively adjusting the detected ambient illumination. It is to provide an OSD half blanking processing apparatus for a television to make a display clearer.

Another object of the present invention is to set the scanning player in the OSD half blanking area variably based on the ABL current level flowing on the primary side of the flyback transformer of the television to increase the clarity of the original video signal. It is to provide a half blanking processing apparatus.

In order to achieve the above object, according to a first embodiment of the present invention, an IF processing unit for IF converting a composite video signal from a broadcasting station, and an OSD generated by the R / G / B signal and OSD processing unit of the video IF signal A television having an image processing unit for half-blanking a signal to be displayed on a CRT screen, the television comprising: an illuminance detection unit for generating a difference signal by comparing peripheral illuminance detected by the first and second illuminance detection sensors with a reference illuminance; A control unit for reading out horizontal scan data in the OSD half blanking area based on the difference signal, an OSD half blanking scan data setting unit for outputting OSD scan line data corresponding to the difference signal under the control of the control unit, and the OSD half blanking unit Half blanking for determining the output timing of the OSD signal generated by the OSD processing unit by the OSD scan line data output from the scan data setting unit. There is provided an OSD half blanking processing apparatus for a television including a scanning line determining section.

According to the OSD half blanking processing apparatus for a television according to the present invention having the above-described configuration, the peripheral illuminance is detected so that the peripheral illuminance is equal to or higher than the reference illuminance or the control unit appropriately adjusts the number of scan lines of the OSD half blanking region according to the ABL current level. By omitting, the sharpness of the original video signal is increased.

1 is a block diagram showing an OSD processing system applied to a general television;

2 is a block diagram of an OSD half blanking processing apparatus for a television according to a first embodiment of the present invention;

3 is an exemplary view for explaining a scanning state of an OSD half blanking area executed by an OSD half blanking processing apparatus of a television according to the first embodiment of the present invention;

4 is a block diagram of an OSD half blanking processing apparatus for a television according to a second embodiment of the present invention.

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

10: remote control, 12: control unit,

14: IF processing unit, 16: image processing unit,

18: OSD processing unit, 20: synchronization signal detection unit,

22a, 22b: first and second illuminance detection sensor,

24: illuminance detection unit, 26: OSD half blanking scanning data setting unit,

28: half blanking scanning line determination unit, 32: flyback transformer (FBT),

34: ABL current detector.

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

FIG. 2 is a block diagram illustrating an apparatus for roughening adaptive OSD half blanking according to a first embodiment of the present invention. Referring to FIG. 2, parts identical to those of FIG. 1 are denoted by the same reference numerals. . That is, 10 denotes a remote controller for selecting a specific function for the corresponding television, and 12 executes control on a specific function selected by the remote controller 10, and adapts to the ambient light and changes the scanning line of the OSD character. The control unit in charge of control is shown. 14 denotes an image IF processing unit PIF for converting IF by applying a predetermined intermediate frequency to the composite video signal RF of the channel selected under the control of the control unit 12, and 16 denotes the image IF processing unit ( A video processing unit which reproduces a video IF signal applied in step 14) and applies it to a CRT apparatus (not shown) as an R / G / B signal so that an image corresponding to the R / G / B color signal is reproduced on a screen. In addition, 18 is an OSD signal corresponding to the OSD control signal applied from the control unit 12 to generate the OSD signal based on the horizontal / vertical synchronous signal (H / Vsync) of the video signal applied from the synchronization signal detection unit 20 An OSD processor which applies a signal to the image processor 16 is shown.

2, reference numerals 22a and 22b denote first and second illuminance detection sensors which are provided at predetermined positions at the left and right ends of the corresponding television, and detect peripheral illumination of the television. 2 The illuminance detection unit which compares the peripheral illuminance detected by the illuminance detection sensors 22a and 22b with the reference illuminance set as a reference and applies the difference signal to the controller 12 to perform the illumination-adaptive OSD half blanking process. Indicates. Further, reference numeral 26 is a half blanking scan data setting unit in which data for determining the scanning player in the OSD half blanking area by peripheral illumination recognition is set according to the present invention. The first OSD scan line data applicable when the ambient illuminance is lower than the reference illuminance and the second OSD scan line data applicable when the ambient illuminance is similar to the reference illuminance and the peripheral illuminance compared to the reference illuminance Third OSD scan line data applicable in a high case is set. Preferably, the first OSD scan line data is set such that horizontal scan lines for displaying OSD characters and scan lines of the original video signal are alternately scanned in the OSD half blanking area, and the second OSD scan line data is used for the OSD half blanking. Two horizontal scan lines are alternately scanned for the original video signal with respect to the horizontal scan line for displaying the OSD characters in the area, and the third OSD scan line data is used for displaying the OSD characters in the OSD half blanking area. Three horizontal scan lines are set to be scanned with respect to the original video signal for one horizontal scan line.

Further, 28 is an OSD generated by the OSD processing unit 18 based on the scanning line data of the OSD character provided from the half-blocking scan data setting unit 26 based on the peripheral illuminance level under the control of the control unit 12. A half blanking scan line determining unit for setting the horizontal scanning timing of a character is shown.

Subsequently, the operation of the OSD half blanking processing apparatus of the television having the above-described configuration will be described in detail with reference to an exemplary view showing a screen scanning state of the OSD half blanking regions shown in FIGS. 3A and 3B. Explain.

First, when tuning of a specific channel is performed as a setting of a specific function for the control unit 12, the control unit 12 applies tuning data of that particular channel to a tuner (not shown) so that tuning of that channel is performed. The composite video signal of the channel is applied to the PIF 14, and IF converted by a predetermined intermediate frequency to the image processor 16.

At this time, the control unit 12 performs a half blanking process for the OSD character when the screen guidance for the specific function or the caption data included in the video IF signal is detected. Peripheral illuminance detection is performed from the first and second illuminance detection sensors 22a and 22b provided at the left and right ends, and is applied to the illuminance detection unit 24. Accordingly, the illuminance detecting unit 24 compares the preset standard illuminance with the peripheral illuminance and applies the difference signal to the controller 12.

Then, the control unit 12 performs scanning line data corresponding to the difference among the third and third OSD scan line data set in the half blanking scan data setting unit 26 based on the difference signal applied from the illuminance detection unit 24. Is selected and applied to the half blanking scan line determiner 28. That is, the controller 22 causes the first OSD scan line data to be read when the detected peripheral illuminance is lower than the reference illuminance, whereas when the detected peripheral illuminance is similar to the reference illuminance, The OSD scan line data is read. When the detected peripheral illumination is higher than the reference illuminance, the third OSD scan line data is read.

Accordingly, the half blanking scan line determiner 28 determines horizontal scan timing for the OSD characters generated by the OSD processor 18 based on the OSD scan line data applied from the half blanking scan data setter 26. For example, the half blanking scan line determiner 28 reads and applies the first OSD scan line data to the OSD half blanking area 30a of the CRT screen 30 in the form shown in FIG. In this case, when the horizontal scanning of one OSD signal is performed, the timing is set so that the horizontal scanning of the original video signal is performed and applied to the OSD processing unit 18. Accordingly, the OSD processing unit 18 generates the horizontal scanning of the original video signal. The OSD signal (ie, OSD half blanking signal) is applied to the image processor 16 only in the horizontal scan timing of the OSD signal illustrated in FIG.

Accordingly, the image processing unit 16 performs reproduction processing on the original video signal applied from the PIF 14 in the screen region except for the OSD half blanking region 30a among the entire region of the CRT screen 30. In addition to being displayed on the CRT screen, the OSD half blanking area 30a alternately outputs the original video signal and the OSD signal.

Therefore, when the peripheral illuminance of the television is higher than the reference illuminance, the number of scanning lines of the OSD signal displayed on the CRT apparatus is appropriately reduced, so that the recognition of the original video signal is increased with respect to the OSD half blanking signal.

In addition, when the second OSD scanning line data is applied from the half blanking scanning data setting unit 26, the half blanking scanning line determining unit 28 has a CRT screen 30 in the form shown in FIG. In the OSD half blanking area 30a of FIG. 1, when horizontal scanning of one OSD signal is performed, the timing is set so that horizontal scanning of the original video signal is performed twice and applied to the OSD processing unit 18. Accordingly, the OSD signal (ie, OSD half blanking signal) generated by the OSD processor 18 is applied to the image processor 16 only in the horizontal scanning timing of the OSD signal illustrated in FIG. 3B. The processor 16 performs reproduction processing on the original video signal applied from the PIF 14 in the screen region except for the OSD half blanking region 30a among the entire regions of the CRT screen 30 and displays it on the CRT screen. The OSD half blank When the horizontal scan is performed on the original video signal in the area 30a, one horizontal scan is performed on the OSD signal, and thus the recognition degree of the original video signal in the OSD half blanking area 30a is further increased. Will be increased.

The half-blanking scan line determiner 28 performs one horizontal scan on the OSD signal when the third OSD scan line data is applied when the peripheral illumination level is lower than the reference illuminance. The half blanking scanning timing is determined and applied to the OSD processing unit 18 in such a manner that three horizontal scannings are performed, and accordingly, the original half of the OSD half blanking signal processed by the image processing unit 16 and displayed on the CRT screen is displayed. The video signal becomes in a state of higher sharpness.

Here, when the OSD half blanking area 30a defined in the CRT screen 30 is generally set in the range of 425H to 520H (H: horizontal scan line), the OSD even if the number of horizontal scan lines for the OSD half blanking signal is reduced. The identification of the signal is relatively degraded in recognition, but the OSD character can be identified.

FIG. 4 is a block diagram of an OSD half blanking processing apparatus for a television according to a second embodiment of the present invention. In the first embodiment, a scanning line conversion is performed on an OSD half blanking signal by an illuminance detection method. In this second embodiment shown in Fig. 4, the ABL current flowing through the primary side of the flyback transformer 32 is detected by the ABL current detection unit 34 to display the OSD half blanking area according to the contrast level of the image signal. A configuration is adopted in which the number of scan lines is converted.

That is, according to the second embodiment of the present invention illustrated in FIG. 4, when the level of the ABL current flowing to the primary side of the flyback transformer 32 is detected by the ABL current detection unit 34, the controller 22 may control the controller 22. The ABL current level is compared with a reference value, and the first, second or third OSD scan line data is read from the OSD half blanking scan data setting section 26 according to the level difference, and the half blanking scan line determination section 28 is read. Therefore, the half blanking scan line determiner 28 sets the horizontal scan timing for the half blanking signal and the original video signal in a manner similar to the procedure described in the first embodiment to the OSD processor 18. The original video signal and the OSD half blanking signal reproduced by the image processing unit 16 are thus applied to the half blanking area 30a of the CRT screen in the form illustrated in FIG. 3 (a) or (b). Injection from It is revoked.

On the other hand, the present invention is not limited to the above examples and various modifications can be made within the scope not departing from the gist of the invention. For example, the half-blanking scanning line setting unit 28 is excluded and the OSD half blanking scanning data is set. The data read out by the unit 26 may be directly applied to the image processing unit 16 so that the OSD half blanking signal and the original image signal are output based on the scan data.

As described above, according to the OSD half blanking processing apparatus of a television according to the present invention, the number of scanning lines for the OSD half blanking area of a CRT screen is properly adjusted based on the difference between the detected ambient light and reference illuminance or ABL current level. It is possible to improve the clarity of the original video signal by adjusting, thereby enabling the recognition of the image part concealed by the OSD half blanking area.

Claims (5)

An IF processor 14 for IF converting a composite video signal from a broadcasting station, and an image processor for half blanking the R / G / B signal and the OSD signal generated by the OSD processor to display on the CRT screen; 16) a television with An illuminance detection unit 24 for generating a difference signal by comparing the peripheral illuminance detected by the first and second illuminance detection sensors with the reference illuminance, A control unit 12 for reading out the horizontal scan data in the OSD half blanking area based on the difference signal; An OSD half blanking scan data setting unit 26 for outputting OSD scan line data corresponding to the difference signal under the control of the controller 12; And a half blanking scan line determiner 28 for determining an output timing of the OSD signal generated by the OSD processor 18 by the OSD scan line data output from the OSD half blanking scan data setting unit 26. OSD half blanking processing apparatus for a television set. The second OSD blank blanking scan data setting unit includes: a first OSD scan line data applicable when the peripheral illuminance is lower than the reference illuminance and a second applicable when the peripheral illuminance is similar to the reference illuminance; And OSD third scanning line data applicable to the case where the OSD scanning line data and the peripheral illumination level are higher than the reference illuminance. 3. The first OSD scan line data is set such that horizontal scan lines for displaying OSD characters and scanning lines of the original image signal are alternately scanned in the OSD half blanking area, and the second OSD scan line data is scanned. In the OSD half blanking area, two horizontal scan lines are alternately scanned for the original video signal with respect to the horizontal scan line for displaying the OSD characters, and the third OSD scan line data is used to display the OSD characters in the OSD half blanking area. OSD half blanking apparatus for a television, characterized in that three horizontal scan lines are set to be scanned with respect to the original video signal for one horizontal scan line for display. An IF processor 14 for IF converting a composite video signal from a broadcasting station, and an image processor for half blanking the R / G / B signal and the OSD signal generated by the OSD processor to display on the CRT screen; 16) a television with An ABL current detector 34 for detecting an ABL current from the primary side of the flyback transformer 32, A controller 12 for comparing the detected ABL current with a reference value and reading out the horizontal scan data in the OSD half blanking area based on the difference signal; An OSD half blanking scan data setting unit 26 for outputting OSD scan line data corresponding to the difference signal under the control of the controller 12; And a half blanking scan line determiner 28 for determining an output timing of the OSD signal generated by the OSD processor 18 by the OSD scan line data output from the OSD half blanking scan data setting unit 26. OSD half blanking processing apparatus for a television set. 5. The first OSD of claim 4, wherein the OSD half blanking scanning data setting unit 26 is configured to alternately scan a horizontal scan line for displaying OSD characters and a scanning line of an original image signal in the OSD half blanking region. And second OSD scan line data in which two horizontal scan lines are alternately scanned with respect to the original video signal with respect to the scan line data and the horizontal scan line for displaying OSD characters in the OSD half blanking area, and the OSD half blanking area. And the third OSD scan line data is set such that three horizontal scan lines are scanned for the original video signal with respect to one horizontal scan line for displaying the OSD text.

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