KR19980039561A - Sub-screen control device of television receiver - Google Patents

Abstract

The present invention relates to a sub-screen control device of a television receiver that enables viewers to recognize the sub-pictures at all times by adjusting the color of the periphery of the picture in accordance with the ambient light around which the television receiver is installed. 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 the signal and the second video signal processed on the sub-screen. The illuminance detecting means for detecting the illuminance of the surroundings in which the television receiver is installed, the memory means storing the peripheral color control data corresponding to the illuminance detected by the illuminance detecting means, and the illuminance detecting means And control means for controlling the sub-screen processing means by reading control data from the memory means based on the received illuminance.

Description

Sub-screen control device of television receiver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver that adjusts the peripheral color of a picture in picture according to the ambient light around which a television receiver is installed so that viewers can always clearly recognize the sub picture. It relates to a screen control device.

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 position of the sub-screen and the color of the periphery of the sub-screen are selected when the television receiver is manufactured, and the control unit 15 operates when the viewer operates the remote controller 13 to select the sub-screen function. By controlling the PIP processing unit 10 in accordance with the program, the position of the sub-screen and the color of its peripheral part are set.

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 edge are similar, the peripheral edge set for identification of the sub-screen is recognized as part of the main screen. As the boundary between the screen and the sub-screen becomes unclear, it becomes difficult for a viewer to identify the sub-screen.

Accordingly, an object of the present invention is to provide a sub-screen control apparatus of a television receiver that enables a viewer to clearly recognize a sub-screen at all times regardless of the color tone of the main screen.

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.

Figure 4 is a characteristic curve showing the characteristics of the illuminance sensor in FIG.

**** 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: remote control device,

32: illuminance detection unit, 33: data memory,

34: control unit, 321: illumination sensor,

322: analog to digital converter.

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. A television receiver having image processing means for generating, the illuminance detecting means for detecting illuminance around the television receiver is installed, and corresponding illuminance detected by the illuminance detecting means. And memory means for storing peripheral color control data, and control means for reading the control data from the memory means based on the illuminance detected by the illuminance detection means to control the sub-screen processing means. do.

According to the present invention having the above-described configuration, the peripheral color of the sub-screen is adjusted according to the ambient illuminance in which the television receiver is installed, and when the ambient illuminance is high, the peripheral color is set to a dark system color and the ambient illuminance is set. In the lower case, the peripheral color is set to the bright color.

Therefore, the viewer can always clearly distinguish the main screen and the sub-screen to watch the television receiver.

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 peripheral color automatic adjustment function of the sub-screen.

In the drawing, reference numeral 32 denotes an illuminance detector for detecting illuminance around the television receiver, which includes a resistor R1 and an illuminance sensor 321 connected in series between the power supply voltage Vcc and ground. And an analog / digital converter 322 coupled to the connection node of the resistor R1 and the illuminance sensor 321 to convert the voltage value applied to the illuminance sensor 321 into digital data and output the digital data.

FIG. 4 is a diagram showing illuminance versus resistance characteristics of the illuminance sensor 321. FIG. 4 (A) shows a positive type and FIG. 4 (B) shows a negative type of illuminance sensor. will be.

As shown in FIG. 4, the illuminance sensor 321 changes its resistance value according to the ambient illuminance. Therefore, as shown in FIG. 3, when the voltage value applied to the illuminance sensor 321 is converted into digital data, the analog / digital converter 322 outputs the digital data corresponding to the ambient illuminance.

In FIG. 3, reference numeral 33 denotes a data memory in which a plurality of color control data for controlling the PIP processing unit 10 to set the peripheral color of the sub-screen are stored. The data memory 33 is, for example, a ROM table. The peripheral color control data is stored in correspondence with the illuminance data output from the illuminance detection unit 32.

In the drawing, reference numeral 34 denotes a predetermined value from the data memory 32 in accordance with the illuminance data applied from the illuminance detector 32 when the viewer operates the remote control device 31 to select the peripheral color automatic adjustment function. The color control data is read out, and the control unit controls the PIP processing unit 10 based on the color control data.

That is, in the embodiment having the above-described configuration, when the viewer operates the remote controller 31 to select the automatic color adjustment function of the peripheral edge of the main screen, the control unit 34 is applied to the illuminance data applied from the illuminance detection unit 32. Accordingly, the peripheral color control data is read from the data memory 33 to control the PIP processing unit 10.

In this case, the peripheral memory color data according to the illumination data is stored in the data memory 33 in correspondence with each other. For example, the higher the illumination intensity, the brighter the control data for generating the peripheral color of the dark system, Control data for generating the peripheral color of the system is stored.

Therefore, when the viewer selects the automatic color adjustment function for the peripheral edge of the sub-screen, the peripheral edge of the ambient light in which the television receiver is installed, that is, the dark edge is set in a bright color when the viewing environment is dark, and when the viewing environment is bright By setting the periphery part in the dark color, viewers can always clearly recognize the boundary between the main picture and the sub picture.

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 of the peripheral part of the sub-screen is automatically adjusted according to the illuminance of the surroundings where the television receiver is installed, so that the viewer can always clearly recognize the boundary between the main screen and the sub-screen. .

Claims (2)

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, Illuminance detecting means for detecting illuminance around the television receiver; Memory means for storing peripheral color control data corresponding to the illuminance detected by the illuminance detecting means; And control means for reading the control data from the memory means and controlling the sub picture processing means based on the illuminance detected by the illuminance detection means. 2. The sub-screen control apparatus for a television receiver according to claim 1, further comprising: selecting means for the viewer to select a peripheral color automatic adjustment function according to illuminance.