KR100252618B1 - Tv having an automatic adjusting pip color level which is adapted to main color level - Google Patents

Abstract

PURPOSE: A television receiver equipped with a subordinate screen chrominance level automatic correction function according to a main screen chrominance level is provided to automatically correct a chrominance level of a subordinate screen by detecting a chrominance level of a video screen outputted to a main screen. CONSTITUTION: A main screen chrominance level detection unit(40) receives a luminescence signal outputted from a video processing unit(11) and a blanking signal outputted from a PIP processing unit(31), and detects a chrominance level of a main screen output video. A chrominance correction data memory unit(41) stores subordinate screen chrominance level correction data corresponded to a relevant data value. A microprocessor(42) controls the video processing unit(11) according to data applied from the main screen chrominance level detection unit(40) on the basis of correction data stored in the chrominance correction data memory unit(41).

Description

Television receiver with automatic sub-screen chromaticity level correction according to main screen chromaticity level

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and in particular, to detect a chromaticity level of a video screen output to the main screen and to automatically correct the chromaticity level of a subscreen based on the detection level. It is related with the equipped television receiver.

Recently, some commercially available television receivers (hereinafter referred to as TV receivers) have adopted a sub picture function that allows one screen to be divided and output two or more channel programs simultaneously. It shows the internal structure of the TV receiver equipped with a screen function.

In Fig. 1, reference numeral 22 denotes a first tuner TUNER for main picture channel selection, 23 denotes a first IF amplifier for amplifying an intermediate frequency (IF) signal output from the first tuner 22, and First P / S separation, for example, comprising a surface acoustic wave filter (SAW FILTER) for separating the IF signal output from the first IF amplifier section 23 into an image intermediate frequency signal PIF and an audio intermediate frequency signal SIF, respectively. 25 is a first video signal detector for detecting a video signal from the video intermediate frequency signal PIF1 separated and output from the first P / S separator 24, and 26 is a first P / S separation. The first voice signal detector is for detecting the voice signal from the voice intermediate frequency signal SIF1 which is separately output from the unit 24.

On the other hand, reference numeral 32 is a second tuner for picture in picture (PIP) channel selection, 33 is a second IF amplifying unit for amplifying the intermediate frequency signal output from the second tuner 32, 34 is For example, the surface acoustic wave, such as the first P / S separation unit 24, that separates the IF signal output from the second IF amplifier 33 into an image intermediate frequency signal PIF and an audio intermediate frequency signal SIF, respectively. The second P / S separators 35 and 36 each made of a filter detect a video signal from the video / audio intermediate frequency signals PIF2 and SIF2 separated and output from the second P / S separator 34, respectively. 2 is a video signal detector and a second audio signal detector for detecting an audio signal.

In addition, reference numeral 7 is a remote control device for remotely controlling the overall operation of the device, 8 is a receiving unit for receiving the infrared signal transmitted from the remote control device 7 and converting it into an electrical signal, 9 is this receiving unit ( A microprocessor serving as a control unit for outputting a predetermined clock signal CL and a data signal DATA for controlling the entire apparatus in accordance with a contracted code signal output from 8).

Reference numeral 20 denotes a composite video signal output from the first and second video signal detectors 25 and 35 and the first and second audio signals according to a predetermined control signal from the microprocessor 9. A switching unit for selectively switching the audio signal output from the detectors 26 and 36, respectively, reference numeral 28 denotes a voice for the main screen output from the switching unit 20 under the control of the microprocessor 90 A first audio processing unit for processing a signal, 29 is an audio amplification unit for amplifying the audio signal processed by the first audio processing unit 28 to output to the speaker 30 connected to the rear end, 27 is the switching unit 20 A second audio processing unit for processing the audio signal for the sub-screen output from the output through the headphone jack (not shown) installed in the TV main body.

On the other hand, the reference numeral 31 receives an image signal selected and output as the sub-screen image signal from the switching unit 20 based on this R ', G', B '(Red, Green, Blue) for generating the sub-screen And a PIP processing unit for outputting a blanking signal Y ', and 11 denotes a main composite image signal output from the switching unit 20 and R', G ', B output from the PIP processing unit 31. An image processor for outputting R, G, B, and luminance signals Y for main and sub picture output based on 'and blanking signal Y', and 12 denotes R, A CRT driving unit for driving the CRT 13 on the basis of G, B and the luminance signal (Y).

That is, according to the device having the above configuration, when the user selects the sub-screen output function through the remote controller 7, the microprocessor 9 controls the first tuner 22 to output the channel to the main screen. In addition to tuning the channel to be output to the sub-screen through the second tuner 32, the main picture video signal tuned by the first tuner 22 is the image processing unit 11, and The sub-screen video signal tuned by the tuner 32 is processed by the PIP processing unit 31, respectively, so that the main screen video and the sub-screen video are simultaneously output on one screen at a predetermined ratio on the CRT 13 screen. Will be.

On the other hand, the image output to the sub-screen is the same as the image output to the main screen, but the signal type is output only as small as a predetermined ratio, as a result the image signal is concentrated within the limited screen size Overall, the chromaticity level is higher than the main screen output image.

This phenomenon causes the color density of the video screen output through the main screen and the video screen output through the sub-screen to show a slight difference, so that viewers feel that the screen output state is unnatural. There was a problem of having.

The present invention was created in view of the above circumstances, and the sub-screen chromaticity level is automatically detected so that the chromaticity level of the video screen output to the main screen can be detected and the chromaticity level of the sub-screen can be automatically corrected based on the detection level. The aim is to provide a television receiver with a calibration function.

1 is a block diagram showing the internal structure of a conventional general sub-screen providing function television receiver.

2 is a block diagram showing the internal configuration of a television receiver equipped with a sub-screen chromaticity level correction function according to an embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

1: antenna 7,40: remote control device

8,41: receiver 9, 42: microprocessor

11: Image Processing Unit 12: CRT Driver

13: CRT 20: switching unit

22: first tuner 23: first IF amplifier

24: first P / S separation unit 25: first video signal detector

26: first voice signal detector 27: second voice processor

28: first voice processing unit 29: voice amplifier

30: speaker 31: PIP processing unit

32: second tuner 33: second IF amplifier

34: second P / S separator 35: second video signal detector

36: second audio signal detector 40: main screen chromaticity level detector

41: chromaticity correction data storage unit

A television receiver having a chromaticity level automatic correction function according to the present invention for realizing the above object has a first tuner 22 for the main picture broadcasting station, a second tuner 32 for the sub picture broadcasting station, and a predetermined control signal. A sub picture output function television receiver having a PIP processing unit 31 for processing a broadcast signal tuned by the second tuner 32 and outputting a video signal to be output to a sub picture according to the present invention; Color tone signals (R, G, B) for main / sub picture output based on the main picture video signal tuned and demodulated by the first tuner 22 and the sub picture video signal output from the PIP processing unit 31; ) And a luminance signal (Y) and a chroma processing for the sub-screen image output according to a predetermined control signal, and an image processing unit (11), and color tone signals (R, G) output from the image processing unit (11). Is applied to the blanking signal Y 'outputted from the PIP processing unit 31, and the color tone signals R, G, and B during a period in which the blanking signal Y is set to a low level. The main screen chromaticity level detector 40 for analyzing and outputting detection data corresponding to the chromaticity level detection signal of the main screen output screen, and the detection data applied from the main screen chromaticity level detector 40 according to the data value. Chromatogram with corresponding subscreen chromaticity level correction data The sub-screen by controlling the image processing unit 11 according to the detection data applied from the main screen chromaticity level detection unit 40 based on the correction data stored in the data storage unit 41 and the chromaticity correction data storage unit 41. And a control unit 42 for performing chromaticity correction on the video signal output from the control unit.

That is, according to the present invention having the above configuration, it is possible to automatically correct the chromaticity level of the video screen output through the sub-screen to an appropriate level based on the chromaticity level of the main screen, thereby causing a visual unnaturalness of the screen output state. Can be eliminated.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

FIG. 2 is a block diagram illustrating an internal configuration of a television receiver equipped with a sub-screen chromaticity level correction function according to an embodiment of the present invention. FIG. 2 is the same as that of the component shown in FIG. Reference numerals will be omitted, and detailed description thereof will be omitted.

In FIG. 2, reference numeral 40 denotes a color tone signal R, G, and B outputted from the image processor 11, a luminance signal Y, and a blanking signal Y 'outputted from the PIP processor 31. The main screen chromaticity level detecting unit detects the chromaticity level of the screen output image. The main screen chromaticity level detecting unit 40 is configured to set a blanking signal Y output from the PIP processing unit 31 to a low level. The R, G, and B signals are analyzed during the section, that is, the section in which the main screen image is output, and accordingly output detection data corresponding to the chromaticity level detection signal of the main screen output screen to the microprocessor 42.

Further, reference numeral 41 denotes a chromaticity correction data storage unit for storing sub-screen chromaticity level correction data corresponding to a corresponding data value with respect to detection data applied from the main screen chromaticity level detection unit 40, which is a main screen chromaticity level. When it detects with this predetermined data value, it is a memory which stores as data how much the chromaticity level of a subscreen should be set.

In addition, reference numeral 42 controls the operation of the apparatus as a whole, and according to the detection data applied from the main screen chromaticity level detection unit 40 based on the correction data stored in the chromaticity correction data storage unit 41, an image processor. By controlling (11), it is a microprocessor which performs chromaticity correction on the video signal output to the sub picture.

Next, the operation of the device having the above configuration will be described.

During TV viewing, when the user operates the remote controller 7 to select the sub-screen output function, the microprocessor 42 controls the switching unit 20 to select the video signal tuned by the second tuner 32. Is applied to the PIP processing unit 31 to output the video signal of the channel tuned by the second tuner 32 through the sub-screen divided at a predetermined ratio of the main screen.

Meanwhile, the main screen chromaticity level detection unit 40 detects only the blanking signal Y 'among the sub-screen image signals R', G ', B', and Y 'from the PIP processing unit 31. When the output level of the blanking signal Y 'is recognized as a low state, the levels of the color tone signals R, G, and B output from the image processor 11 are compared and analyzed, respectively, to be output to the main screen. The color density of the video screen is determined.

Subsequently, the main screen chromaticity level detection unit 40 converts the detection signal according to the color concentration into digital data and outputs it to the microprocessor 42. The microprocessor 42 converts the main screen chromaticity level detection unit 40 into the digital screen. The chromaticity correction data storage unit 41 finds the data applied from the sub-screen chromaticity correction data corresponding to the data.

Thereafter, the microprocessor 42 outputs a predetermined control signal to the sub-screen image level adjustment terminal P.CON of the image processing unit 11 based on the read sub-screen chromaticity correction data, and then through the CRT 13. The chromaticity level of the output subscreen is corrected to an appropriate level based on the chromaticity level of the main screen.

That is, according to the embodiment, a television receiver having a subscreen chromaticity level automatic correction function capable of detecting a chromaticity level of a video screen output to the main screen and automatically correcting the chromaticity level of a subscreen based on the detection level. Can be realized.

On the other hand, the present invention is not limited to the above embodiments and can be modified in various ways without departing from the technical gist of the present invention.

As described above, according to the present invention, the chromaticity level of the video screen output through the sub-screen can be automatically corrected to an appropriate level based on the chromaticity level of the main screen, thereby eliminating visual unnaturalness of the screen output state. It becomes possible.

Claims (1)

The first tuner 22 for the main screen broadcasting station, the second tuner 32 for the sub-screen broadcasting station, and the sub-screen by processing the broadcast signal tuned by the second tuner 32 according to a predetermined control signal. A sub picture output function television receiver having a PIP processing unit 31 for outputting a video signal to be outputted in the mobile terminal; Color tone signals (R, G, B) for main / sub picture output based on the main picture video signal tuned and demodulated by the first tuner 22 and the sub picture video signal output from the PIP processing unit 31; And an image processor 11 for outputting the luminance signal Y and controlling chromaticity of the sub-screen image output according to a predetermined control signal. The tone signal R, G, B output from the image processor 11 and the blanking signal Y 'output from the PIP processor 31 are applied to the blanking signal Y to a low level. A main screen chromaticity level detector 40 for analyzing the color tone signals R, G, and B during the set period, and outputting detection data corresponding to chromaticity level detection signals of the main screen output screen accordingly; A chromaticity correction data storage 41 for storing sub-screen chromaticity level correction data corresponding to the data value with respect to the detection data applied from the main screen chromaticity level detection unit 40, On the basis of the correction data stored in the chromaticity correction data storage unit 41 controls the image processing unit 11 according to the detection data applied from the main screen chromaticity level detection unit 40 for the image signal output to the sub-screen And a control unit (42) for performing chromaticity correction.

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