CN100508574C - Video-audio playing control system of liquid crystal television - Google Patents

Abstract

The invention discloses an audio-video playing control system of a liquid crystal television, which is used for controlling an audio system, a video system and a backlight source system of the liquid crystal television. The control system of the invention mainly keeps the starting state under the normal state through an audio-visual control unit, and the audio-visual control unit receives a signal transmitted from an external control interface to determine to output a starting signal to singly start the audio signal processing unit, or singly start the image processing unit and the backlight source system, or jointly start the audio signal processing unit, the image processing unit and the backlight source system, thereby realizing the digital control of the liquid crystal television and achieving the purposes of energy saving and electricity saving.

Description

Video and audio playback control system for LCD TV

technical field

The invention relates to an audio-visual play control system of a liquid crystal television, in particular to a control system applied to a single play mode or a joint play mode of video and audio of the liquid crystal TV.

Background technique

The electric drive method of the existing LCD TV is to convert the AC power input by the AC power supply into low-voltage DC power through an AC-to-DC power supply (the existing specifications are 5V, 12V, 24V, 48V, etc., and the output specifications are made by each manufacturer. set), the low-voltage direct current is provided to the low-voltage load of the TV, which may include display driver panels, video processing circuit boards, speakers and other equipment, and the low-voltage direct current is output separately to a high-voltage power conversion system, the high-voltage conversion system makes the low-voltage direct current boosted to output high-voltage electricity to drive a high-voltage load of a TV, and the high-voltage load is a backlight module with a gas discharge lamp (such as a cold cathode lamp tube).

However, the use of LCD TVs with digital functions only involves changing the image signal processing method to digital encoding, and therefore can add many digital functions to LCD TVs, such as adding digital image memory card readers to digital TVs. After inserting the digital image memory card shot and recorded by the digital camera, the user can transform the LCD TV into an LCD electronic photo frame to watch photos, and it can also be used to add a radio tuner function to the LCD TV, or directly connect an audio-visual digitally The player enables the LCD TV to play music directly. However, it can be seen from the existing products that when the user selects either the photo viewing function or the music playback function, all the power systems of the LCD TV are fully turned on. In this way, the components that do not need to be operated will still consume power, especially when the user uses the music playback function alone, if the backlight system and the image processing system are still turned on, not only the power consumption will increase, but also cause Its service life shortens rapidly and eliminates LCD TV early.

Contents of the invention

The main purpose of the present invention is to solve the above-mentioned defects. In order to avoid the existence of the defects, the present invention provides a control system for the single play mode or the common play mode of the video and audio of the LCD TV.

According to the video and audio playback control system of a liquid crystal television of the present invention, it is used to control the audio system, imaging system, and backlight system of a liquid crystal television, wherein the control system includes: an audio and video transmission unit, which includes an audio signal for driving the audio system Processing unit and an image processing unit driving the imaging system; a power system, which includes a standing power unit with power-on power that is electrically connected to the external power under normal conditions, and a first power that uses the output power to drive the audio-visual transmission unit unit, and a second power unit that drives the backlight system with output power; an audio-visual control unit and an external control interface, the audio-visual control unit is provided with stable power by the standing power unit to keep the startup state under normal conditions, and the audio-visual control unit The unit receives the signal transmitted from the external control interface to decide to output a start signal to single start the audio processing unit, or single start the image processing unit and the backlight system, or jointly start the audio processing unit, the image processing unit, and the backlight system ; Wherein, a power supply opening and closing circuit is provided between the audio-visual control unit and the power system, and the power supply opening and closing circuit receives a start signal and outputs a drive signal to open and close the first power unit and the second power unit to output power.

The video and audio playback control system of the liquid crystal television according to the invention has the beneficial effects of realizing digital control of the liquid crystal television and energy saving.

Description of drawings

FIG. 1 is a schematic diagram of a circuit block of the present invention.

Detailed ways

Now with reference to the accompanying drawings, the detailed description and technical content of the present invention are described as follows:

Please refer to Fig. 1, which is a schematic block diagram of an implementation circuit of the present invention. As shown in the figure, the present invention is an audio-visual playback control system for a liquid crystal television, mainly used to control an audio system 60, image display of a liquid crystal television System 70, and backlight system 80, the control system includes:

An audio-video transmission unit 40 includes an audio processing unit 41 for driving the audio system 60 and an image processing unit 42 for driving the display system 70 .

A power system 20, which includes a standing power unit 21 that is electrically connected to the external power 10 under normal conditions and has a power supply for starting up, a first power unit 22 that drives the audio-visual transmission unit 40 with output power, and a power unit 22 that uses output The power to drive the second power unit 23 of the backlight system 80, between the above-mentioned standing power unit 21 and the external power 10, a switch line 11 for opening and closing power transmission under normal conditions can be set, the first power unit 22 The main output is converted low-voltage DC, such as 5V, 12V, 24V, 48V and other DC voltages, which will provide all the driving power to the audio-visual transmission unit 40, and can also include the audio system 60 (such as a built-in speaker) and video The operating power provided by the system 70 (such as a display screen), and the power source of the second power unit 23 of the low-end LCD TV can also come from the DC power provided by the first power unit 22 and then be boosted by an inverter (inverter) circuit. High-voltage power is used to drive the backlight system 80, while high-end LCD TVs can be rectified from the external power 10 to medium-voltage direct current (such as 120V, 155V, 240V, 380V or 400V) and directly boosted to drive the backlight system 80, because The above-mentioned various types of electric drive modes are all existing technologies, and will not be described in detail below.

An audio-visual control unit 30 and an external control interface 50, the audio-visual control unit 30 is provided with stable power by the standing power unit 21 to keep the startup state under normal conditions, the external control interface 50 can be a remote controller, and the audio-visual control unit 30 receives the signal transmitted from the external control interface 50 to determine to output a start signal a1, a2, a3, a4 to single start the audio processing unit 41, or single start the image processing unit 42 and the backlight system 80, or jointly start The audio processing unit 41 , the image processing unit 42 , and the backlight system 80 .

When the user wants to use the image display function of the LCD TV alone, such as watching digital photos, the signal with the independent image display function is transmitted to the audio-visual control unit 30 through the external control interface 50, and the audio-visual control unit 30 starts the output. Signals a1, a3, a4 are used to independently activate the image processing unit 42 and the backlight system 80, and the activation method may be through a power supply opening and closing circuit 24 provided between the audio-visual control unit 30 and the power system 20, and the power supply opening and closing circuit 24 receives the start signal a1 and outputs drive signals b1, b2 to open and close the first power unit 22 and the second power unit 23 to output power, wherein the power supply opening and closing circuit 24 can also be provided with stable power by the standing power unit 21 to Keep the activated state under normal conditions, or the activation signals a3 and a4 of the audio-visual control unit 30 directly drive the image processing unit 42 and the backlight system 80 to activate them. In this embodiment, the audio-visual control unit 30 can be used to Turning on and off is realized by the activation signal a3 of the switch circuit 411 between the image processing unit 42 and the first power unit 22. It can be clearly seen from the above that when the user uses the image display function, the audio system of the LCD TV 60 and the audio processing unit 41 will still be in the state of power interruption and not turned on, which will effectively avoid unnecessary waste of electric energy.

If the user wants to use the music playing function alone, the signal for independently starting the music playing function is transmitted to the audio-visual control unit 30 through the external control interface 50, and the audio-visual control unit 30 enables the output activation signals a1, a2 to independently activate the audio processing unit 41 and The audio system 60 can also be activated in the same manner by providing a power supply opening and closing circuit 24 between the audio-visual control unit 30 and the electrical system 20, so that the power supply opening and closing circuit 24 receives the activation signal a1 and outputs a driving signal b2 to open and close The first power unit 22 outputs power, or the audio processing unit 41 is directly driven by the activation signal a2 of the audio-visual control unit 30 to start it. In this embodiment, the audio-visual control unit 30 can be used to open and close a media It is realized by the switch circuit 421 between the audio signal processing unit 41 and the first electric unit 22. It can be clearly seen from the above that when the user operates the music playing function, the display system 70, image processing unit 42, The second power unit 23 and the backlight system 80 are still in the state of power interruption and not turned on, which can effectively avoid unnecessary waste of electric energy, and since no image light source is generated, it will not interfere with ambient light.

If the user watches a film or TV program, then all the above functions can be fully opened, but if the user still does not need the audio system 60 and the audio processing unit 41 if the user connects the LCD TV to the external audio equipment, then the audio system 60 and the audio processing unit 41 can still be used as required. And set.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. the control system for playing back video and audio of a LCD TV is used to control sound information system, imaging system, and the back light source system of a LCD TV, it is characterized in that described control system comprises:

One audio-visual transmission unit, it includes the image process unit that an audio communication processing unit and that drives described sound information system drives described imaging system;

Unified power system, its include one with the external power normality under first power unit of the described audio-visual transmission unit of driven by power of standing power unit, usefulness the output that possesses start electric power that is electrically connected and second power unit of the described back light source system of driven by power that a usefulness is exported;

An one audio-visual control unit and an external control interface, described audio-visual control unit provides stable electric power to keep starting state with under the normality by described standing power unit, and described audio-visual control unit receives from the signal of described external control interface transmission to come the described audio communication processing unit of single startup or described image process unit of single startup and back light source system with decision output one enabling signal or start described audio communication processing unit, described image process unit, and described back light source system jointly;

Wherein, be provided with a power supply between described audio-visual control unit and the described electric power system and open and close circuit, described power supply opens and closes circuit and receives described enabling signal and export described drive signal to open and close described first power unit and described second power unit comes output power.

2. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, described power supply opens and closes circuit provides stable electric power to keep starting state under normal conditions by described standing power unit.

3. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, the enabling signal of described audio-visual control unit directly drives described audio communication processing unit with its startup.

4. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, the enabling signal of described audio-visual control unit directly drives described image process unit with its startup.

5. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, the enabling signal of described audio-visual control unit directly drives described back light source system with its startup.

6. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, the enabling signal of described audio-visual control unit is in order to open and close a switching circuit between described audio communication processing unit and described first power unit.

7. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, the enabling signal of described audio-visual control unit is in order to open and close a switching circuit between described image process unit and described first power unit.

8. the control system for playing back video and audio of LCD TV according to claim 1 is characterized in that, can be provided with a switching circuit between described standing power unit and the described external power.

Images