KR20000041696A - Television displaying background image during power-off state - Google Patents

Abstract

PURPOSE: A television displaying background image during power-off state is provided to display a background image rather than a blank screen. CONSTITUTION: A television displaying background image during power-off state includes a power control circuit(25), a switching circuit(26), an image memory(27), a power switch, a microcomputer(24), and a video encoder(28). The power control circuit(25) rectifies AC power to a DC power of a predetermined level, and applies the result to an input circuit and an image reproducing circuit. The switching circuit(26) turns on or off the power applied from the input circuit. The image memory(27) records a predetermined image data. The power switch turns on or off the power of the television. The microcomputer(24) controls the switching circuit to be short or open according to the operation of the power switch. The video encoder(28) converts the image data from the image memory to an analog mixed image signal, and outputs the result to the image reproducing circuit.

Description

TV with wallpaper output when power off

The present invention relates to a television that receives an over-the-air broadcast signal and reproduces video and audio. More specifically, the present invention relates to a television that outputs a predetermined picture or photo on a television screen when it is not watching a broadcast. It's about television.

In modern cars, not only audio equipment but also television equipment are basically installed, so as to eliminate the boredom of passengers caused by long-term movement.

FIG. 1 is a block diagram schematically showing a circuit configuration of a television device among various electronic products added to a vehicle as described above. Like a general television, a vehicle television mounted on an automobile is an antenna ANT for receiving a broadcast signal. And a tuner 11 for receiving a carrier frequency of a selected channel through the antenna ANT and converting the carrier frequency into an intermediate frequency, and a saw filter 12 provided at an output terminal of the tuner 11 and having an intermediate frequency band pass characteristic. And an amplifying unit 13 for amplifying the intermediate channel and the intermediate frequency from which the noise is removed through the saw filter 12 to a predetermined level, and an image intermediate frequency and an audio intermediate at the intermediate frequency output from the amplifying unit 13. A detector 14 for detecting a reference frequency for finding a frequency and a base frequency by demodulating the image intermediate frequency according to the detected reference frequency among the intermediate frequencies output from the detector 14. A video demodulator 15 for converting the video signal into a video signal of an audio signal, and an audio demodulator for demodulating the audio intermediate frequency according to the detected reference frequency among the intermediate frequencies output from the detector 14 and converting it into a baseband audio signal. 16), the synchronization circuit unit 17 for separating the synchronization signal from the video signal output from the video demodulator 15, and the electronic beam to move horizontally and vertically in accordance with the synchronization signal separated from the synchronization circuit unit 17. A deflection circuit 18 for generating a signal for generating a signal, a color signal reproducing circuit section 19 for converting a video signal output from the video demodulation section 15 into a color signal (R, G, B) signal, and the color signal reproducing circuit section. A receiver 20 for shooting a R, G, B electron beam according to the color signal applied from the screen 19 on the screen according to the deflection control of the deflection circuit 18, and outputting from the audio demodulator 16; A voice circuit section 22 for amplifying an audio signal and a speaker 23 for converting an audio signal output from the voice circuit section 22 into sound waves.

However, when the power source applied from the outside is turned off, all of the above-described circuits do not operate. At this time, the screen of the receiver 20 becomes black because there is no electron beam applied.

Therefore, when it is not broadcast time, the television screen appears black as it is, and it hurts the surrounding atmosphere and aesthetics. In particular, in a television apparatus mounted in a narrow vehicle, only a black screen is visible for many hours of unused use, so that the atmosphere in the vehicle may be darker.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to stop only the reception operation of a broadcast signal and turn off the receiver when the power is turned off, so that a specific image (still image) is stored in advance, not a black screen. It is to provide a television that the background screen is output when the power off shown on the screen.

1 is a block diagram showing a general configuration of a television.

2 is a block diagram showing the configuration of a television according to the present invention.

3 is an exemplary view showing a power off television screen according to an embodiment of the present invention.

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

11 tuner portion 12 saw filter portion 13 amplifier portion

14: detector 15: video demodulator 16: audio demodulator

17. Synchronization circuit section 18: Deflection circuit section 19: Color signal reproduction circuit section

20: receiver 22: audio circuit 23: speaker

24: micom 25: power control circuit section 26: switching circuit section

27: video memory unit 28: video encoder 100: receiving circuit unit

200: video playback circuit

As a construction means for achieving the object of the present invention described above, the present invention is a receiver circuit unit for receiving a high frequency broadcast signal provided by airwaves and outputting a video signal and an audio signal, and the receiver by the video signal provided from the receiver circuit unit A television, wherein a background screen is output when a power is turned off, the image reproducing circuit section configured to reproduce an image on a screen of

A power control circuit unit for rectifying the AC power supplied from the outside into a DC power having a predetermined level and applying the received power to the receiving circuit unit and the image reproduction circuit unit, respectively;

A switching circuit unit provided between the power control circuit unit and the receiving circuit unit to apply or cut off power applied to the receiving circuit unit;

A video memory unit for storing predetermined video data;

A power switch for turning on / off the power of the television;

A microcomputer that checks the operation of the power switch and controls the switching circuit unit to conduct the conduction operation, and controls the switching circuit unit to read and output the data stored in the image storage unit while the switching circuit unit performs a shut-off operation;

And a video encoder converting the video data output from the video memory into an analog composite video signal and outputting the video data to the video playback circuit.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the television according to the present invention.

FIG. 2 is a block diagram illustrating a television according to the present invention, and includes an antenna ANT for receiving a broadcast signal, and a tuner for receiving a carrier frequency of a selected channel through the antenna ANT and converting the carrier frequency into an intermediate frequency. 11) a saw filter 12 disposed at the output of the tuner 11 and having an intermediate frequency band pass characteristic and attenuating adjacent channel signals, and an intermediate channel from which the adjacent channel and noise are removed through the saw filter 12. An amplifier 13 for amplifying a frequency to a predetermined level, a detector 14 for detecting a reference frequency for finding an image intermediate frequency and an audio intermediate frequency at an intermediate frequency output from the amplifier 13, and the detector ( A video demodulator 15 for demodulating the video intermediate frequency according to the detected reference frequency among the intermediate frequencies outputted from 14) and converting the video intermediate frequency into a video signal of the baseband, and among the intermediate frequencies outputted from the detection unit 14. An audio demodulation unit 16 for demodulating a voice intermediate frequency in accordance with the emitted reference frequency and converting it into a baseband audio signal, and a synchronization circuit unit 17 for separating a synchronization signal from the video signal output from the video demodulation 15; And a deflection circuit 18 for generating a signal for moving the electronic beam horizontally and vertically according to the synchronous signal separated from the synchronous circuit unit 17, and a video signal output from the video demodulator 15. Color signal reproduction circuit unit 19 for converting to R, G, B) signals, and R, G, B electron beams corresponding to color signals applied from the color signal reproduction circuit unit 19 are screened according to the deflection control of the deflection circuit unit 18. A sound receiver 20 for creating a predetermined image, an audio circuit 22 for amplifying the audio signal output from the audio demodulator 16, and an audio signal output from the audio circuit 22. A circuit for receiving the broadcast signal upon power-on by checking the speaker 23 and the power switch SW to be converted to the power switch SW, that is, the tuner unit 11, the saw filter 12, and the amplifier unit 13 Power supply to the detector 14 and the video / audio demodulator 15 and 16, and the circuit for image reproduction, i.e., the synchronization circuit 17, the deflection circuit 18, and the color signal reproduction circuit 19 The driving power to the audio circuit 22 is applied as it is, while the microcomputer 24 for controlling the output of the stored video and the power supplied from the outside (eg, battery power or commercial AC power) are input to each circuit of the television. A power supply control circuit section 25 for rectifying with a DC power source for driving and applying to each circuit, the circuits for receiving the power control circuit section 25 and the broadcast signal, that is, the tuner 11 and the saw filter 12 And between the amplifier 13, the detector 14, and the video / audio demodulators 15, 16. And a switching circuit section 26 for supplying / blocking power in accordance with the control signal of the microcomputer 24, and storing predetermined video data, and reading and outputting the stored video data according to the control signal of the microcomputer 24. The image storage unit 27 and the image data output from the image storage unit 27 are converted into an analog broadcast signal in which a synchronization signal, a luminance signal, and a color difference signal are mixed to convert the color signal reproduction circuit unit 19 and the synchronization circuit unit 17. A video encoder 28 for outputting the same.

As described above, the operation of the constructed television is performed as follows.

In the television apparatus, for convenience of explanation, the TV apparatus is divided into two parts according to the power control difference, and the tuner 11 and the saw filter 12 which receive a broadcast signal and convert it into a video signal and an audio signal; Including the amplifier 13, the detector 14, and the video demodulator 15 and the audio demodulator 16, the amplification unit 13 and the detection circuit unit 100, which is input from the receiving circuit unit 100 or the video encoder 28 Image reproducing circuit section including a synchronization circuit section 17, a deflection circuit section 18, a color signal reproducing circuit section 19, a receiver 20, an audio circuit section 22, and a speaker 23 for reproducing an image with a video signal. Tied to 200.

Then, the operation is performed as follows.

When the user, that is, a person who wants to watch television, turns on the power switch SW, the microcomputer 24 detects this and controls the switching circuit unit 26 to be in a conductive state.

Therefore, the externally supplied power source (battery power source or commercial AC power source) is rectified by the power supply control circuit unit 25 into DC power required for driving each circuit and outputted through each terminal. The power applied to each circuit of the reception circuit unit 100 is output through the switching circuit unit 26. Since the switching circuit unit 26 is in a current conduction state, power is applied to each circuit of the reception circuit unit 100 as it is. In addition, powers of the image reproduction circuit unit 200 which are output as it is without passing through any switching circuit are also applied to each circuit.

Therefore, the tuned high frequency signal of the tuned broadcast is received through an antenna and converted into an intermediate frequency signal by the tuner unit 11, and the amplification unit 13 removes the adjacent channel signal from the saw filter unit 12. Then, the detector 14 and the video / audio demodulators 15 and 16 demodulate the high frequency signals to be amplified based on the detected reference frequencies and demodulate the video signals and the audio signals, respectively.

Then, the synchronization circuit unit 17 and the deflection circuit unit 18 apply the horizontal deflection signal and the vertical deflection signal according to the period of the vertical synchronization signal and the horizontal synchronization signal of the video signal to the deflection coil of the receiver 20, and the color signal reproduction circuit unit. In 19, the R, G, and B color signals are converted from the video signal and output to the receiver 20. Accordingly, the receiver 20 generates R, G, and B electron beams according to the R, G, and B color signals, and the R, G, and B electron beams are bent by a deflection coil applied with a vertical / horizontal deflection signal to the screen. Is injected. As a result, a predetermined image appears on the screen. The audio signal demodulated and output by the audio demodulator 16 is amplified by the audio circuit 22 and then applied to the speaker 23 to be converted into sound waves, whereby the viewer hears a predetermined audible sound.

However, when the power switch SW is turned off, the microcomputer 24 recognizes this, controls the switching circuit unit 26 to cut off, and outputs the image data stored in the image storage unit 27. Apply the control signal.

Therefore, of the driving power output from the power control circuit section 25, the power supply for the reception circuit section 100 is switched to the reception circuit section 100, i.e., the tuner section 11, the saw by the switching circuit section 26 in the cut-off state. It is not applied to the filter section 12, the amplifier section 13, the detector section 14, and the video / audio demodulation sections 15 and 16. Therefore, since the circuits to which power is not applied do not operate, reception of a high frequency broadcast signal transmitted by airwaves becomes impossible.

Instead, video data such as a predetermined background picture or picture stored in the video storage unit 27 is sequentially outputted, and the video encoder 28 converts the analog composite video signal consisting of a synchronization signal, a luminance signal, and a color difference signal. After the conversion, the signal is output to the synchronization circuit unit 17 and the color signal reproduction circuit unit 19 of the image reproduction circuit unit 200 which are operated to reproduce the image.

Accordingly, the synchronization circuit unit 17 and the deflection circuit unit 18 detect the synchronization signal from the video signal applied from the video encoder 28 and receive the horizontal deflection signal and the vertical deflection signal in accordance with the horizontal synchronization period and the vertical synchronization period. And the color signal reproducing circuit unit 19 converts the image signal applied from the video encoder 28 into R, G, and B color signals and applies them to the receiver 20. The receiver 20 generates an electron beam according to the input R, G, and B color signals and scans the screen according to the deflection signal.

As a result, a predetermined background picture or picture stored in advance is displayed on the screen of the receiver 20. And since there is no audio signal input to the voice circuit section 22 and the speaker 23, no audible sound is generated.

In the above description, the image data stored in advance in the image storage unit 27 may be image data obtained by reading a beautiful landscape picture, a family picture, or the like with a scanner. The video storage unit 27 stores the video storage unit 27 in order to provide an order from the manufacturer as a service. As another example, the video storage unit may be a disk or the like as an auxiliary storage device, and data may be stored on the television. A floppy disk drive that can be read can be connected so that a user can directly provide or change image data to be a wallpaper when the TV is powered off.

FIG. 3 is an exemplary view showing a screen of a television on which an image set at power off is output according to the present invention. Here, the family picture is stored in advance as image data so that the family picture appears at power off. Therefore, the bleak atmosphere seen in the power-off television can be eliminated. In particular, as shown, when the family picture is set, the television can be used as a frame.

As described above, the television according to the present invention receives each high frequency broadcast signal provided by airwaves when the power is turned on, reproduces the video or audio, and allows viewing of the broadcast. It can be used as an interior accessory by outputting a still image such as a landscape picture, and in the case of a car television installed in a narrow car, it is not necessary to prepare a separate frame or the like. As a family picture appears, there is an excellent effect that the television itself can be used as a frame.

Claims (1)

Background of the power-off when the circuit comprises a reception circuit unit for receiving a high frequency broadcast signal provided by airwaves and outputting a video signal and an audio signal, and a video reproduction circuit unit for reproducing the image on the screen of the receiver by the video signal provided from the reception circuit unit. In the television which a screen is output, A power control circuit unit for rectifying the AC power supplied from the outside into a DC power having a predetermined level and applying the received power to the receiving circuit unit and the image reproduction circuit unit, respectively; A switching circuit unit provided between the power control circuit unit and the receiving circuit unit to apply or cut off power applied to the receiving circuit unit; A video memory unit for storing predetermined video data; A power switch for turning on / off the power of the television; A microcomputer that checks the operation of the power switch and controls the switching circuit unit to conduct the conduction operation, and controls the switching circuit unit to read and output the data stored in the image storage unit while the switching circuit unit performs a shut-off operation; And a video encoding unit converting the image data output from the image storage unit into an analog composite video signal and outputting the converted image data to the image reproduction circuit unit.