KR0120284B1 - Full level change apparatus of white signal and black signal in a television - Google Patents

Abstract

When the picture of a TV is on a white signal shows a poor dissection of the picture. The composite image signal fed to level converting parts(30,40) are distributed with bias to the upper part in the whole amplitude range, and it is output thru the normal of a switching device(32). When the white key of a key input part(10) is manipulated, the composite image signal is supplied to the level conversion parts(30,40) thru the white terminal and after the DC level is reduced to 1/2, it is transferred to an amplifier(36) and the input signal is amplified to double it with the gain of two times and output.

Description

White level and black signal conversion device of television

1 is a diagram showing a main block structure of a conventional television.

2 is a block diagram showing an apparatus for level conversion of white signals and black signals of a television according to an embodiment of the present invention.

3 is a block diagram showing an apparatus for level conversion of a white signal and a black signal of a television according to another embodiment of the present invention.

FIG. 4 is a diagram showing a concrete circuit block of the level conversion circuit part of FIG.

5 to 7 are diagrams showing output characteristics of the level converting circuit section shown in FIG.

* Explanation of symbols for main parts of the drawings

10: key input unit 12: microcomputer

14 tuner 16 intermediate frequency (IF) amplifier

18: External A / V input part 20: A / V main switching circuit part

22: YC separation circuit section 24: RGB color difference signal amplification section

30, 40, 50: level conversion circuit 32: switching means

34: the ratio conversion unit 36: amplification unit

The present invention relates to an apparatus for converting an entire level of a white signal and a black signal of a television, and more particularly, when a screen is mainly composed of white or black, the contents of a screen displayed in white or black can be distinguished according to a user's selection. The present invention relates to an overall level converting apparatus for a white signal and a black signal of a television.

In general, as shown in FIG. 1, a television is provided at a lower end of a front side of a remote controller or a main body, and includes a power on / off control key, a channel line international key, and a television / external input switching key. By outputting the tuning data to the tuner 14 according to the up and down key input unit 10 and the input signal of the channel line international key from the key input unit 10, the corresponding channel broadcast signal among the television broadcast signals is pioneered. Controlling to switch and select a television broadcast signal or an external audio / video input signal by outputting an input signal switching control signal to the following audio / video (A / V) main switching circuit section 20 according to an input signal of an external input switching key. The microcomputer 12 converts the frequency of the channel signal tuned in accordance with the tuning signal from the microcomputer 12 into an intermediate frequency signal that is easy to amplify. An output tuner 14, an intermediate frequency (IF) amplifier 16 for receiving and amplifying an intermediate frequency signal from the tuner 14, for example, from an external A / V source such as a video tape recorder or a laser display. A / V signal from the IF amplifier section 16 or the external A / V input section according to the input signal switching control signal from the microcomputer 12, the external A / V input section 18 where the A / V input is made. 18) and selects the A / V signal from the A / V signal and outputs the selected video signal to the YC separation circuit section 22 through the monitor output MO, and the luminance signal (Y signal) separated from the YC separation circuit section 22 and The A / V main switching circuit 20 is provided to receive the color signal C and output the RGB color difference signal amplifying part 24 to an RGB output part (not shown).

In such a television, when an image is composed on a screen such as a very dark night with almost no lighting, almost all screens are implemented with a black signal, so that the viewers are allowed to see the components (e.g., if the background is a room). There was a problem that it was difficult to distinguish between furniture and people). For example, when an image having a beach or a search light that is too strong in light is configured, almost all screens are implemented with white signals, which makes it difficult for a viewer to distinguish the components in the screen.

Accordingly, the present invention has been made in view of the above-described circumstances, and the white signal of a television which enables the user to distinguish the contents of the screen according to the user's selection when the screen is mainly composed of white or black is difficult to distinguish the exact contents of the screen. And an overall level converting device for a black signal.

According to the whole level conversion apparatus of the white signal and the black signal of the television according to the present invention for achieving the above object, a key input unit for control input of the television, and the entire television according to the control input from the key input unit A microcomputer performing a control operation, an intermediate frequency amplifier for receiving and amplifying an intermediate frequency signal of a channel signal tuned by a tuner according to the tune signal from the microcomputer, and an external A with an A / V input from an external A / V source. / V input unit, the A / V signal from the IF amplifier or the A / V signal from the external A / V input unit is selected according to the input signal switching control signal from the microcomputer and the selected video signal is monitored and output. A / V which outputs to YC separation circuit part and receives Y, C signal separated from this YC separation circuit part and outputs to RGB color difference signal amplification part. In a television equipped with an in-switching circuit; The key input unit is provided with a white key, a black key and a normal key; The microcomputer outputs different control signals according to the input of the white key, the black key, and the normal key from the key input unit; A level is provided between the composite video signal output terminal of the IF amplification unit and the television composite video signal input terminal of the A / V main switching circuit unit to level the white signal and the black signal of the television composite video signal according to the control signal of the microcomputer. A white signal of an external composite video signal according to the control signal of the microcomputer is installed between the conversion circuit unit and the composite video signal output terminal of the external A / V input unit and the external video signal input terminal Vin of the A / V main switching circuit unit. And a level converting circuit unit for leveling the black signal.

According to another embodiment of the present invention, if the total level conversion apparatus of the white signal and the black signal of the television is different, a key input section for controlling the television input and a control operation of the entire television according to the control input from the key input section are performed. MICOM, an intermediate frequency (IF) amplifying unit for receiving and amplifying an intermediate frequency signal of a channel signal tuned by a tuner according to the tuning signal from the microcomputer, and an external A / V input from an external A / V source. A V input section, an A / V signal from the IF amplifier section or an A / V signal from the external A / V input section is selected according to the input signal switching control signal from the microcomputer, and the selected video signal is monitored for output. A / V main switching circuit which outputs to YC separation circuit part and receives Y, C signal separated from this YC separation circuit part and outputs to RGB color difference signal amplification part In a television provided with a ro part, A white key, a black key and a normal key are provided in the key input unit; The microcomputer outputs different control signals according to the input of the white key, the black key, and the normal key from the key input unit, and is installed between the Y signal output terminal of the A / V main switching circuit unit and the RGB color difference signal amplifier. A level conversion circuit unit for leveling the white signal and the black signal of the Y signal according to a control signal of the microcomputer, a C signal output terminal of the A / V main switching circuit unit, and the RGB color difference signal amplifying unit to control the microcomputer; And a level converting circuit unit for leveling the white signal and the black signal of the C signal according to the signal.

Here, the level converting unit is connected to the white terminal and switching means for switching the input signal from the input terminal to three terminals of the white terminal, the normal terminal and the black terminal according to the control signal from the microcomputer, and the direct current of the input signal. A level converting unit for level converting the level 1/2 times, an amplifying unit for amplifying and outputting the output signal of the level converting unit or the output signal of the black terminal with a double gain, an output signal of the amplifying unit or the normal It consists of an output terminal which outputs the signal from a terminal as an output signal.

Hereinafter, with reference to the accompanying drawings, a detailed description will be given of a full level conversion apparatus for a white signal and a black signal of a television according to the present invention.

FIG. 2 is a block diagram showing an apparatus for level conversion of a white signal and a black signal of a television according to an embodiment of the present invention, in which the same reference numerals are attached to the same parts as in FIG. 1, and detailed description thereof will be omitted.

In the present embodiment, the television is installed between the composite video signal output terminal of the IF amplifier 16 and the television composite video signal input terminal Vin 'of the A / V main switching circuit 20. The television according to the control signal of the microcomputer 12 is used. A level conversion circuit section 30 for leveling the white and black signals of the composite video signal to the full level, the composite video signal output terminal of the external A / V receiver 18, and the A / V main switching circuit section 20; Is provided between the external video signal input terminals (Vin), and further includes a level conversion circuit section (40) for leveling the white and black signals of the external composite video signal according to the control signal of the microcomputer (12). This is different from the conventional example of 1 degree.

In addition, the key input unit 10 includes a white key for leveling up the white signal when the screen is mainly composed of white so that the screen appears clearly, and a black level when the screen is mainly composed of black. A black key for displaying the screen clearly and a normal key for configuring the screen normally.

The microcomputer 12 outputs different control signals to the level converting circuits 30 and 40 according to the input of the white key, the black key, and the normal key from the key input unit 10.

In addition, the level converting circuit section 30, 40 receives the input signal Vi from the input terminal IN and the white terminal White and the normal according to the control signal from the microcomputer 12 as shown in FIG. A switching means 32 for switching to three terminals, a terminal (normal) and a black terminal (Black), and a level converting unit connected to the white terminal (White) to level convert the DC level of the input signal by 1/2 times ( 34) an amplification section 36 and amplification section 36 for amplifying and outputting the output signal of the level converter 34 or the output signal of the black terminal Black with a double gain; The output terminal OUT outputs a signal or a signal from the normal terminal as an output signal Vo.

The apparatus for level conversion of the white signal and the black signal of a television according to an embodiment of the present invention configured as described above will be described in detail with reference to the characteristic diagrams of FIGS.

First, while listening to a television broadcast (or an A / V signal from a video tape recorder with an external A / V input, for example), a normal image is formed on the screen of the television and applied to the level converting sections 30 and 40. As shown in FIG. 5 (a), the composite image signal Vi is uniformly distributed over the entire amplitude range, and the signal is output to the output terminal OUT as it is through the normal terminal of the switching means 32. [Here, the level converting circuits 30 and 40 receive the first control signal from the microcomputer 12 when the normal key of the key input unit 10 is operated, and outputs the input signal as it is.

Next, when listening to a television broadcast (or an A / V signal from a video tape recorder as an external A / V input, for example), an image having a beach or a searchlight with a very strong light on a television screen is formed. As almost all screens are implemented with white signals, it becomes difficult for a viewer to distinguish the components in the screen. At this time, the composite video signal Vi applied to the level converting units 30 and 40 is distributed to the upper side with respect to the entire amplitude range as shown in FIG. 6 (a). It is output to the output terminal OUT as it is through the normal terminal. In this state, when the viewer operates the white key of the key input unit 10, the second control signal from the microcomputer 12 is applied to the switching means 32 of the level converting units 30 and 40, and the As shown, the composite video signal Vi applied to the level converting units 30 and 40 is applied to the level converting unit 34 through the white terminal White so that the DC level is reduced as shown in FIG. It is reduced by half and then applied to the amplifier 36. The amplifier 36 amplifies and outputs the input signal with a double gain as shown in FIG. Accordingly, when the screen is mainly composed of white and it is difficult to discern the exact contents of the screen, as the user operates the white key of the key input unit, the level converting circuit units 30 and 40 can be operated to level the entire level. The components on the screen can be distinguished.

Next, while listening to a television broadcast (or an A / V signal from a video tape recorder as an external A / V input, for example), when an image is composed against a very dark night with little lighting, almost all screens are black. As the signal is implemented, it becomes difficult for the viewer to distinguish the components in the screen (for example, furniture or a person when the background is a room). At this time, the composite video signal VI applied to the level converting units 30 and 40 is distributed to the lower side with respect to the entire amplitude range as shown in FIG. It is output to the output terminal OUT as it is through the normal terminal. When the viewer operates the black key of the key input unit 10 in this state, the third control signal is applied from the microcomputer 12 to the switching means 32 of the level converting units 30 and 40, and FIG. As shown in FIG. 2, the amplification unit 36 is applied to the amplifying unit 36 through the composite video signal Vi black terminal Black applied to the level converting units 30 and 40, wherein the input signal Va of the amplifying unit 36 is It is as shown in FIG. 7 (b). The amplifier 36 amplifies and outputs the input signal Va with a double gain as shown in FIG. Accordingly, when the screen is mainly composed of black and it is difficult to discern the correct contents of the screen, the level conversion circuits 30 and 40 operate as the user operates the black key of the key input unit, thereby leveling the complex video signal inputted to the entire level. It is possible to distinguish the components on the screen.

FIG. 3 is a block diagram illustrating a residual level converting apparatus for a white signal and a black signal of a television according to another embodiment of the present invention. The same reference numerals as those of FIG. 1 are used, and detailed description thereof will be omitted.

In the present embodiment, it is provided between the Y signal output terminal Yout of the A / V main switch circuit unit 20 and the RGB color difference signal amplifying unit 24 and according to the control signal of the microcomputer 12, the white signal and the black signal of the Y signal. The control signal of the microcomputer 12 is provided between the level conversion circuit section 50 for leveling the signal and the RGB color difference signal amplifying section 24 of the C signal output terminal Cont of the A / V main switching circuit section 20. The level conversion circuit section 60 for further leveling the white signal and the black signal of the C signal is further provided, which is different from the conventional example of FIG.

The key input unit 10 includes a white key for leveling up the white signal when the screen is mainly composed of white so that the screen appears clearly, and a black level when the screen is mainly composed of black. A black key for displaying the screen clearly and a normal key for configuring the screen normally.

In addition, the microcomputer 12 outputs different control signals to the level change circuit sections 50 and 60 according to the input of the white key, the black key, and the normal key from the key input unit 10.

In addition, as shown in FIG. 4, the level converting circuit section 50, 60 also converts the input signal Vi from the input terminal IN to the white terminal White and the normal according to the signal control from the microcomputer 12. As shown in FIG. A switching means 32 for switching to three terminals, a terminal (normal) and a black terminal (Black), and a level changing unit (34) which is connected to the white and converts the DC level of the input signal by 1/2 times. ), An amplification unit 36 for amplifying and outputting the output signal of the level converter 34 or the output signal of the black terminal Black with an input terminal having a gain twice as large as that of the amplifying unit 36. Or an output terminal OUT for outputting a signal from the normal terminal as an output signal Vυ.

An apparatus for converting an entire level of a white signal and a black signal of a television according to another embodiment of the present invention configured as described above will be described in detail with reference to FIG. 5 to FIG. 7.

First, while listening to a television broadcast (or an A / V signal from a bio tape recorder as an external A / V input), the luminance applied to the level converting section 50 when a normal image is formed on the screen of the television. The signal (Y signal) and the color signal (C signal) applied to the level converter 60 are uniformly distributed over the entire amplitude range as shown in FIG. It is output to the output terminal OUT as it is through the normal terminal (Normal). Here, when the normal key of the key input unit 10 is operated, the level conversion circuit unit 50, 60 receives the first control signal from the microcomputer 12. It receives the input and outputs the input signal as it is.

Next, while listening to a television broadcast (or A from a video tape recorder, for example, as an external A / V input), almost all of the images on the television screen are composed of a beach or a searchlight with a strong light in the background. As the screen is implemented as a white signal, it becomes difficult for the viewer to distinguish the components in the screen.

At this time, the luminance signal applied to the level converting section 50 and the color signal applied to the level converting section 60 are distributed to the upper side with respect to the entire amplitude range as shown in FIG. Through the normal terminal (Normal) of the means 32 is output to the output terminal (OUT) as it is. In this state, when the viewer operates the white key of the key input unit (! 0), the second control signal from the microcomputer 12 is applied to the switching means 32 of the level converting units 50 and 60, and FIG. As shown in FIG. 6, the excitation signal applied to the level converting section 50 and the color signal applied to the level converting section 60 are applied to the level converting section 34 through the white terminal (White). As shown, the output signal is amplified by a gain of twice the input scene roll. Accordingly, when the screen is mainly composed of white and it is difficult to discern the correct contents of the screen, the level converting circuit sections 50 and 60 operate as the user operates the white key of the key input section, so that the entire luminance signal and color signal are input. Because it can be leveled, the components on the screen can be distinguished.

Next, while listening to a television broadcast (or A / V signal from a video tape recorder as an external A / V input, for example), when an image is composed against a very dark night with little lighting, almost all screens are black. As it is implemented as a signal, it becomes difficult for a viewer to distinguish the components in the screen, for example, furniture or a person when the background is a room. At this time, the luminance signal applied to the level converting section 50 and the color signal applied to the level converting section 60 are distributed to the lower side over the entire amplitude range as shown in FIG. Through the normal terminal (Normal) of the means 32 is output to the output terminal (OUT) as it is. When the viewer operates the black key of the key input unit 10 in this state, the third control signal is applied from the microcomputer 12 to the switching means 32 of the level converting units 50 and 60, and FIG. As shown in FIG. 5, the luminance signal applied to the level converting section 50 and the color signal applied to the level converting section 60 are applied to the amplifier 36 through the black terminal Black. The input signal Va becomes as shown in Fig. 7B. The amplifier 36 amplifies and outputs the input signal Va with a double gain as shown in FIG. Accordingly, when the screen is mainly composed of black and it is difficult to discern the correct contents of the screen, the level converting circuit sections 50 and 60 operate as the user manipulates the black keys of the key input section, so that the luminance signals and the color signals that are input are totally input. Because it can be leveled, the components on the screen can be distinguished.

As described above, according to the present invention, a white key, a black key, and a normal key are provided in a key input unit, and the microcomputer level converts different control signals according to the input of the white key, black key, and normal key from the key input unit. It outputs to a circuit part. The level converting circuit unit receives a first control signal from a microcomputer when the normal key is pressed in the key input unit and outputs an input signal as it is, and receives a second control signal from the microcomputer when the white key is pressed in the key input unit. The DC level of the input signal is doubled and then the resultant signal is amplified so that the gain is doubled. When the black key is pressed on the key input unit, the third control signal is input from the microcomputer to gain the input signal. It is designed to amplify and output to double.

Therefore, the level conversion circuit configured as described above is provided between the composite video signal output terminal of the IF amplifier section and the television composite video signal input terminal of the A / V main switching circuit section, and the composite video signal output terminal and A / V main switching unit of the external A / V input section. If it is installed between the external video signal input terminals of the circuit part, the screen is composed mainly of white, and even if it is difficult to discern the correct screen contents, the user inputs the white key of the key input part, and thus the level conversion circuit part is operated and inputted. The signal level can be leveled so that the components on the screen can be distinguished, and even if the screen is mainly composed of black, and it is difficult to discern the exact contents of the screen, the level conversion circuit unit is operated as the user operates the black key of the key input unit. Since the input composite video signal can be leveled up, It is possible to distinguish between the waters.

In addition, when the above-described level conversion circuit section is provided on the Y signal output terminal of the A / V main switching circuit section and the RGB color difference signal amplification section, it is provided between the C signal output terminal of the A / V main switching circuit section and the RGB color difference signal amplification section. Even if the screen is composed of white and it is difficult to discern the exact contents of the screen, the level conversion circuit is operated as the user operates the white key of the key input unit so that the luminance signal and the color signal can be totally leveled. On the other hand, even if the screen is mainly composed of black and it is difficult to discern the correct contents of the screen, the level conversion circuit is operated as the user manipulates the black key of the key input unit to level the luminance signal and the color signal as input. It is possible to distinguish the components on the screen.

Claims (4)

A key input unit 10 for control input of a television, a microcomputer 12 which performs control operations of the entire television in accordance with a control input from the key input unit 10, and a tuner (in accordance with a channel selection signal from the microcomputer 12). An intermediate frequency (IF) amplifier 16 for receiving and amplifying an intermediate frequency signal of the channel signal selected in step 14), an external A / V input unit 18 where A / V input is made from an external A / V source source, The A / V signal from the IF amplifier 16 or the A / V signal from the external A / V input unit 18 is switched according to the input signal switching control signal from the microcomputer 12, and the selected video is selected. A / V main switching circuit section for outputting the signal to the YC separation circuit section 22 through the monitor output MO, and receiving the YC signal separated from the YC separation circuit section 22 and outputting it to the RGB color difference signal section 24 ( In the television with 20), the key input section 10 is white. And a black key and a normal key, the microcomputer 12 outputs different control signals according to the input of the white key, the black key, and the normal key from the key input unit 10, and the IF amplifier 16 And a white signal of the television composite video signal according to the control signal of the microcomputer 12, which is installed between the composite video signal output terminal of < RTI ID = 0.0 > a < / RTI > and the television composite video signal input terminal Vin 'of the A / V main switching circuit 20. Between the level conversion circuit section 30 for leveling out the black signal, the composite video signal output terminal of the external A / V input unit 18 and the external video signal input terminal Vin of the A / V main switching circuit unit 20. And a level converting circuit section 40 for leveling both the white signal and the black signal of the external composite video signal in accordance with the control signal of the microcomputer 12. Full level shifter. According to claim 1, The level change circuit section (30, 40) is a white terminal (Normal) terminal (Normal terminal) (Normal terminal) (Normal) terminal (Normal) terminal and the normal terminal (Normal terminal) in accordance with the control signal from the microcomputer 12 And switching means 32 for switching to three terminals of a black terminal, and a level converter 34 connected to the white terminal to convert the DC level of the input signal 1/2 level. An amplifier 36 which receives the output signal of the level converter 34 or the output signal of the black terminal Black, amplifies and outputs with a double gain, an output signal of the amplifier 36 or the normal And an output terminal (OUT) for outputting a signal from a terminal (Normal) as an output signal (Vo). A key input unit 10 for controlling input of a television, a microcomputer 12 which performs control operations of the entire television in accordance with a control input from the key input unit 10, and a tuner in accordance with a tuning signal from the microcomputer 12; An intermediate frequency (IF) amplifying unit 16 for receiving and amplifying the intermediate frequency signal of the channel signal selected in step 14, and an external A / V input unit 18 in which A / V input is made from an external A / V source. Selects an A / V signal from the IF amplifier 16 or an A / V signal from the external A / V input unit 18 according to the input signal switching control signal from the microcomputer 12 and selects A / V main switching outputting the video signal to the YC separation circuit section 22 through the monitor output MO, receiving the YC signal separated from the YC separation circuit section 22, and outputting it to the RGB color difference signal amplification section 24. In a television having a circuit section (20), the key input section (10) is provided. A white key, a black key, and a normal key are installed, and the microcomputer 12 outputs different control signals according to the input of the white key, the black key, and the normal key from the key input unit 10, and the A / It is provided between the Y signal output terminal Yout of the V main switching circuit section 20 and the RGB color difference signal amplifying section 24 so that the white signal and the black signal of the Y signal are in full level according to the control signal of the microcomputer 12. The level conversion circuit section 50, the C signal output terminal Cout of the A / V main switching circuit section 20, and the RGB color difference signal amplifying section 24 to control the control signal of the microcomputer 12. Therefore, the level conversion circuit 60 further comprises a level conversion circuit 60 for leveling both the white signal and the black signal of the C signal. The input terminal Vi from the input terminal IN according to the control signal from the microcomputer 12, the white terminal (Normal) terminal and the normal terminal (Normal terminal) according to claim 3 And switching means 32 for switching to three terminals of a black terminal (Black), and a level converting portion (34) connected to the white terminal (White) to level-change the DC level of the input signal by a factor of 1/2; An amplifier 36 which receives the output signal of the level converter 34 or the output signal of the black terminal (Black) and amplifies and outputs with a double gain, an output signal of the amplifier 36 or the An overall level converting apparatus for a white signal and a black signal of a television, characterized by comprising an output terminal OUT for outputting a signal from a normal terminal as an output signal Vo.