KR19980039562A - Sub-screen control device of television receiver - Google Patents

Abstract

The present invention adjusts the color tone of a picture in picture according to the color tone of the main picture displayed on a CRT (Cathode-ray Tube) so that the viewer can clearly recognize the sub picture at all times. A control apparatus comprising: a first tuner for tuning a broadcast channel for a main picture, a second tuner for tuning a broadcast channel for a sub picture, and a first video signal from the broadcast channel tuned by the first tuner. First video detection means for detecting a second video detection means, second video detection means for detecting a second video signal from a broadcast channel tuned by the second tuner, and sub-screen processing means for performing sub-screen processing on the second video signal. And image processing means for generating a video signal corresponding to the video screen to be displayed on the CRT based on the first video signal and the second video signal processed on the sub-screen. A color tone detection means for detecting a color tone of an image screen displayed on a CRT from an image signal outputted from the image processing means, memory means for storing sub-screen color control data corresponding to the color tone of the image screen; And control means for controlling the sub-screen processing means by reading control data from the memory means based on the color tone of the video screen detected by the color tone detection means.

Description

Sub-screen control device of television receiver

The present invention relates to a television receiver, and in particular, by adjusting the color tone of a picture in picture according to the color tone of the main picture displayed on a cathode-ray tube (CRT), the viewer can always clearly recognize the sub picture. It relates to a sub picture control device of a television receiver.

Recently, in a television receiver, two different broadcast screens of a main picture and a sub picture are generated on one CRT, so that a viewer can watch another broadcast channel through a sub picture while watching one broadcast channel through the main picture. The sub-screen function is adopted.

1 is a block diagram showing the configuration of a television receiver having a sub-screen function as described above.

In Fig. 1, reference numeral 1 denotes an antenna for receiving a broadcast frequency signal, 2 denotes a first tuner for tuning a broadcast channel for a main picture according to a predetermined control signal, and 3 denotes a tuner by the first tuner 2. A first IF amplifying unit for amplifying the intermediate frequency signal IF of the broadcast signal; and 4, an audio intermediate frequency signal SIF and an image intermediate frequency signal (SIF) from the intermediate frequency signal output from the first IF amplifier 3; The first P / S separation unit 5, such as a surface acoustic wave filter (SAW Filter), which separates and outputs the PIF, detects an image intermediate frequency signal (PIF) output from the P / S separation unit 4. A first image detector outputs a composite image signal (CV) for a screen.

In the drawing, reference numeral 6 denotes a second tuner for tuning the broadcast channel for the sub picture according to a predetermined control signal, and 7 denotes an intermediate frequency signal IF of the broadcast signal tuned by the second tuner 6. A second IF amplifying unit for amplifying a, 8 is a second P / S separating unit for separating and outputting an image intermediate frequency signal (PIF) from an intermediate frequency signal output from the second IF amplifying unit (7), and A second image detector detects an image intermediate frequency signal PIF output from the P / S separation unit 8 and outputs a composite image signal CV for a sub picture.

Reference numeral 10 denotes a composite image signal CV output from the second image detector 9 based on predetermined control data DATA and a clock signal CLK and horizontal and vertical synchronization signals H and V. FIG. ) Is a PIP processing unit which outputs R (Red), G (Green), B (Blue) and sub-screen blanking signals (F) for the sub-screen.

In the drawing, reference numeral 11 denotes a CRT image based on the composite image signal CV output from the first image detector 5 and the RGB and sub picture blanking signals F output from the PIP processing unit 10. An image processing unit for generating and outputting an RGB signal corresponding to the image screen to be displayed on the display, and 12 is a CRT driving unit for driving the CRT based on the RGB signal output from the image processing unit 11

In the drawing, reference numeral 13 denotes a remote control device for the viewer to operate the television receiver, 14 a receiving unit for receiving an infrared signal applied from the remote control device 13 and outputting an electric code signal corresponding thereto. The control unit controls the entire apparatus in accordance with the code signal applied from the receiving unit 14.

That is, in the above configuration, when the user controls the remote control device 13 to select the sub picture function, the control unit 15 controls the PIP processing unit 10 to control the RGB and PIP blanking signals F for the sub picture. Will print

At this time, the RGB signal output from the PIP processing unit 10 corresponds to the video signal of the broadcast channel tuned by the second tuner 6, wherein the tuner of the broadcast channel by the second tuner 6 is a remote controller. According to the viewer's selection through the device 13, the control unit 15 is executed by pre-international language of the second tuner 6.

Meanwhile, when the RGB signal and the PIP blanking signal F are output from the PIP processing unit 10 as described above, the image processing unit 11 may be the first image detector when the PIP blanking signal F is not input. (5) outputs an RGB signal corresponding to the composite video signal (CV) applied in the case, and when the PIP blanking signal (F) is input, outputs an RGB signal applied by the PIP processing unit (10) to the CRT The main screen by the first tuner 2 and the sub-screen by the second tuner 6 are simultaneously generated.

By the way, the following problems arise in the television receiver provided with the sub picture function mentioned above.

When the viewer selects the sub picture function by operating the remote control device 13, the sub picture is generated in a predetermined area of the main screen on the CRT as shown in FIG. 2 according to the above-described operation. In order to clearly distinguish the screen, a peripheral part having a predetermined color is displayed.

Here, the output position of the sub-screen and the output screen state, for example, white balance for the sub-screen are selected when the television receiver is manufactured, and the controller 15 controls the viewer by operating the remote controller 13. When the sub screen function is selected, the position of the sub screen and its output screen state are set by controlling the PIP processing unit 10 according to the operation program set at the time of manufacture.

However, in the above-described operation, if the color tone of the video screen displayed on the main screen and the color tone of the peripheral portion are similar, the sub-screen is recognized as a part of the main screen, so that the viewing environment of the main screen as well as the sub-screen is poor. do.

Accordingly, an object of the present invention is to provide a sub-screen control apparatus of a television receiver that allows viewers to clearly see a main screen and a sub-screen, and is created in view of the above circumstances.

1 is a block diagram showing the configuration of a television receiver having a general sub-screen function.

2 is a view showing the shape of a sub-screen displayed on a CRT;

Fig. 3 is a block diagram showing an apparatus for controlling a sub picture of a television receiver according to the first embodiment of the present invention.

Fig. 4 is a block diagram showing a sub picture control apparatus of a television receiver according to a second embodiment of the present invention.

Fig. 5 is a block diagram showing an apparatus for controlling a sub picture of a television receiver according to a third embodiment of the present invention.

**** Brief description of the main parts of the drawing ****

1: antenna, 2, 6: tuner,

5, 9: image detector, 10: sub-screen processing unit,

11: image processing unit, 31, 41: remote control device,

33, 45: control unit, 42: analog to digital converter,

43: arithmetic mean portion, 51: tri-state buffer.

According to a first aspect of the present invention for realizing the above object, an apparatus for controlling a sub-screen of a television receiver includes a first tuner for tuning a broadcast channel for a main screen, and a second tuner for tuning a broadcast channel for a sub-screen. A first video detecting means for detecting a first video signal from a broadcast channel tuned by the first tuner, a second video detecting means for detecting a second video signal from a broadcast channel tuned by the second tuner; A sub picture processing means for performing sub picture processing on the second picture signal, and a picture signal corresponding to a picture picture to be displayed on a CRT based on the first picture signal and the sub picture processed second picture signal. In a television receiver having an image processing means for generating, selection means for a viewer to select a color tone of a sub picture, and a plurality of control data corresponding to the color tone of the sub picture are stored, Is characterized in that it is configured by comprising a control means for controlling the sub-screen processing unit reads out the control data from the memory means depending on the selection of the memory means and the selecting means.

In addition, the sub-screen control apparatus for a television receiver according to the second aspect of the present invention for realizing the above object comprises a first tuner for tuning a broadcast channel for a main screen and a broadcast channel for a sub-screen. A second tuner, first video detection means for detecting a first video signal from a broadcast channel tuned by the first tuner, and a second video detection for detecting a second video signal from a broadcast channel tuned by the second tuner Means, sub-screen processing means for performing sub-screen processing on the second video signal, and an image corresponding to the video screen to be displayed on the CRT based on the first video signal and the sub-screen processed second video signal. In a television receiver having image processing means for generating a signal, a color tone detection number for detecting a color tone of an image screen displayed on a CRT from an image signal output from the image processing means. And the memory means storing sub-screen color control data corresponding to the color tone of the video screen, and the control data from the memory means based on the color tone of the video screen detected by the color tone detecting means. And control means for controlling the means.

According to the present invention having the above-described configuration, the color tone of the sub-screen can be adjusted according to the color tone of the video screen output on the CRT, so that the viewer can clearly see the main screen and the sub-screen.

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

FIG. 3 is a block diagram showing a sub-screen control apparatus for a television receiver according to a first embodiment of the present invention. In FIG. 3, the same reference numerals are given to the same parts as in FIG. 1, and detailed description thereof will be omitted.

In FIG. 3, reference numeral 31 denotes a remote controller having a selection key for the viewer to select a color tone of the sub-screen, and 32 is a plurality of color control data for setting the color tone of the sub-screen by controlling the PIP processing unit 10; That is, it is a data memory in which white balance setting data of a sub picture is stored.

In addition, reference numeral 33 in the drawing reads predetermined color control data from the data memory 32 according to the color selection signal applied from the remote control device 31, and controls the PIP processing unit 10 based on this. Control unit for controlling color tone of sub-screen.

That is, in the embodiment having the above-described configuration, when the viewer views the main screen and the sub-screen through the television receiver and wants to change and set the color tone of the sub-screen, the remote controller 31 operates the selection key.

Then, the controller 33 sequentially reads the color control data of the data memory 32 whenever the viewer operates the remote controller 31, that is, whenever the sub-screen color tone selection signal is input through the receiver 14. By controlling the PIP processing unit 10 based on this.

Therefore, in the above configuration, whenever the viewer operates the selection key of the remote control device 31, the sub-screen color to be displayed on the CRT is changed and set, so that the viewer operates the selection key of the remote control device 31, When the sub-screen is set to the desired color tone, the sub-screen can be set to the desired color tone by stopping the operation of the selection key of the remote controller 31.

On the other hand, in the above embodiment, the color tone of the sub-screen is entirely dependent on the manual operation of the viewer. Therefore, when the color tone of the main screen is changed from time to time, there is a problem that the viewer must change and set the color tone of the sub-screen from time to time by operating the remote control device 31 according to the color tone of the main screen.

Fig. 4 is a block diagram showing a sub picture control apparatus of a television receiver according to the second embodiment of the present invention in view of the above circumstances. In addition, in FIG. 4, the same reference numerals are attached to the same parts as in FIG. 3, and detailed description thereof will be omitted.

In FIG. 4, reference numeral 41 denotes a remote controller having a selection key for the viewer to select an automatic sub-color tone adjustment function, and 42 denotes an analog / digital conversion for each of the RGB signals output from the image processing unit 11. An analog / digital converter, 43, averages the digital data applied from the analog / digital converter 42 based on the vertical synchronization signal Vs, and outputs an average value, that is, a data value corresponding to the average RGB amount of one screen. Is the average calculation unit.

In the figure, reference numeral 44 denotes a data memory in which sub-screen color control data (white balance setting data) corresponding to each RGB data is stored, which is constituted by, for example, a ROM table.

Reference numeral 45 denotes the control of the entire apparatus and from the data memory 44 based on the RGB data applied from the average calculating section 43 when the automatic adjustment of the sub-screen color tone is set by the remote controller 41. The control unit reads the sub-screen color control data and controls the PIP processing unit 10.

That is, in the above configuration, the RGB signal output from the image processing unit 11 by the analog / digital converter 42 is converted into digital data and applied to the average calculating unit 43, and input by the average calculating unit 43. The average value of the RGB values applied from the analog / digital converter 42 is calculated based on the vertical synchronization signal Vs.

Therefore, when the ratio of the RGB values, R: G: B, applied from the average calculation unit 43 is calculated, color tones corresponding to the video screen of one screen output on the CRT are obtained.

The data memory stores color tone control data of a sub-screen corresponding to the ratio value of the RGB signal, wherein the color tone control data of the sub-screen color tone is R: G: When B is 1: 2: 3, the color tone of the sub picture is stored with control data (white balance setting data) for R: G: B to be set to 3: 1: 1 :.

Meanwhile, when the viewer operates the remote controller 41 to select the sub-screen color auto adjustment function, the controller 45 outputs the image to the CRT based on the average value of the RGB values applied from the average calculator 43. After the color tone of the screen is obtained, that is, the ratio value is calculated, the sub-screen color tone control data corresponding to the calculated ratio value is read out from the data memory 44 to control the PIP processing unit 10.

Therefore, in the above embodiment, the color tone of the sub-screen is automatically adjusted according to the color tone of the video screen output on the CRT, so that the viewer can always watch the sub-screen of the screen output state clearly distinguished from the main screen.

On the other hand, in the above embodiment, the color tone of the main screen is detected based on the level of the RGB signal output from the image processing unit 11, wherein the RGB signal output from the image processing unit 11 is used to generate the RGB for the sub-screen. The signal will also be included. Therefore, in the above embodiment, the data value calculated by the average calculation unit 43 is continuously changed by the level of the RGB signal for generating the sub-screen so that the color tone of the sub-screen may be repeatedly changed. do.

Fig. 5 is a block diagram showing a sub-screen control apparatus for a television receiver according to the third embodiment of the present invention in consideration of the above circumstances, which is analog / while the RGB signal is output for sub-picture generation by the PIP processing unit 10. The data output from the digital converter 42 is prevented from being applied to the average calculation unit 43. 5, the same reference numerals are added to the same parts as in FIG.

In FIG. 5, reference numeral 51 denotes three states for selectively controlling data applied from the analog / digital converter 42 to the average calculation unit 43 according to the sub-screen blanking signal F output from the PIP processing unit 10. Buffer

That is, the tri-state buffer 51 outputs the data output from the analog / digital converter 42 when the low-level sub picture blanking signal F is output from the PIP processing unit 10, for example. If the sub-screen blanking signal F is set to a high level, the data output from the analog / digital conversion section 42 is output to the average calculation section 43.

Therefore, in the above embodiment, since the color tone of the main screen is detected based on the RGB signal for generating the main screen and the color tone control of the main screen is performed accordingly, the color tone of the sub-screen can be better controlled.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical scope of the present invention.

As described above, according to the present invention, the color tone of the sub-screen can be adjusted according to the color tone of the video screen output on the CRT, so that the viewer can clearly see the main screen and the sub-screen.

Claims (5)

A first image tuner for tuning the broadcast channel for the main picture, a second tuner for tuning the broadcast channel for the sub picture, and a first image for detecting a first video signal from the broadcast channel tuned by the first tuner Detection means, second video detection means for detecting a second video signal from a broadcast channel tuned by the second tuner, sub-screen processing means for performing sub-screen processing on the second video signal, and the first video In a television receiver having image processing means for generating a video signal corresponding to a video screen to be displayed on a CRT based on the signal and the second video signal processed sub-screen, Selection means for the viewer to select the color tone of the sub-screen, Memory means for storing a plurality of control data for controlling the color tone of the sub-screen, And control means for reading the control data from the memory means and controlling the sub picture processing means in accordance with the selection of the selection means. A first image tuner for tuning the broadcast channel for the main picture, a second tuner for tuning the broadcast channel for the sub picture, and a first image for detecting a first video signal from the broadcast channel tuned by the first tuner Detection means, second video detection means for detecting a second video signal from a broadcast channel tuned by the second tuner, sub-screen processing means for performing sub-screen processing on the second video signal, and the first video A television receiver having image processing means for generating a video signal corresponding to a video screen to be displayed on a CRT based on a signal and the second video signal processed on the sub-screen, Color tone detection means for detecting a color tone of an image screen displayed on a CRT from an image signal output from the image processing means; Memory means for storing sub-screen color control data corresponding to the color tone of the video screen; And control means for controlling the sub-screen processing means by reading control data from the memory means based on the color tone of the video screen detected by the color tone detection means. 3. The sub-screen control apparatus of a television receiver according to claim 2, further comprising: selecting means for the viewer to select a sub-screen color automatic adjustment function of the sub-screen. 3. The sub picture control apparatus of a television receiver according to claim 2, wherein said color tone detecting means detects color tones based on a level ratio of RGB signals output from said image processing means. 3. The sub-screen control apparatus of a television receiver as claimed in claim 2, wherein said color tone detection means detects color tones based on a level of an RGB signal for a main screen image output from said image processing means.