KR19990005440U - Television receiver with viewer-sensitive power saving function - Google Patents

Abstract

The present invention relates to a television receiver having a viewer-sensitive power saving function that executes a power saving function by limiting a beam current of an image output stage when the viewer is recognized as being idle, and is connected as an anode high voltage current source of a CRT. A television receiver provided with a supply power source, comprising: a far-infrared sensor for detecting whether a viewer is within a predetermined distance from a front surface of a TV, a timer for counting a viewer absence state detection time by the far-infrared sensor, and a power supply input terminal A voltage drop unit, an ABL current detector for detecting an excessive supply state of the anode high voltage supply current based on the level of the voltage dropped by the voltage drop unit, and a composite image signal according to a detection result by the ABL current detector An image processor for adjusting output levels of the color difference signal and the luminance signal for the CVS), and a predetermined control signal The absence state of the viewer through the timer on the basis of the switching unit for varying the sensing voltage applied to the ABL current detection unit by interrupting the short circuit between the both ends of the voltage drop, and the level of the detection signal applied from the far infrared sensor And counting the time, and if the time counted by the timer exceeds a predetermined count value, the controller is configured to include a controller for controlling the power saving function to be executed by driving the switching unit on and down to adjust the sensing voltage.

Description

Television receiver with viewer-sensitive power saving function

The present invention relates to a television receiver, and more particularly, to a television receiver having a viewer-sensitive power saving function that executes a power saving function by limiting a beam current of an image output stage when the viewer is recognized as being away.

In general, a deflection circuit of an image output apparatus using a cathode ray tube (CRT) is used to deflect an electron beam emitted from an electron gun using a high voltage so that the emitted electron beam is formed on a fluorescent surface of a cathode ray tube (hereinafter referred to as a CRT). Fig. 1 shows a horizontal / vertical deflection circuit of a conventional general television receiver as a representative example using a cathode ray tube.

In FIG. 1, reference numeral 1 denotes a CRT, 2 denotes a flyback transformer (FBT) for applying a high voltage to the anode electrode P of the CRT 1, and reference numeral H _DY denotes a horizontal deflection coil for horizontal deflection of the electron beam. , C2 is a charge and discharge capacitor.

Further, reference numeral 3 denotes a composite video signal (CVS) detected from the received broadcast signal while outputting predetermined oscillation pulses for the horizontal and vertical outputs of the CRT 1 based on the synchronization signal separately detected from the broadcast signal. It is a chroma IC that outputs a color difference signal and a luminance signal for image output based on a composite video signal, and the inside thereof is synchronized with an X-ray protection unit 3a that controls the output of the oscillation pulse. A horizontal oscillation circuit 3b and a vertical oscillation circuit 3c for outputting an oscillation frequency signal of the same phase as a signal, and an ABL current sensing unit 3d for sensing an ABL current of the anode high voltage, which will be described later, and this ABL current sensing. An image processor 3e is provided to perform signal processing such as screen brightness adjustment on the composite image signal CVS by adjusting the beam current according to the detection result by the unit 3d.

Reference numeral 5 receives a color difference signal and a luminance signal applied from the image processor 3e, and outputs R (Red), G (Green), and B (Blue) signals according to the CRT (1). CRT driving unit 5 for driving, reference I is a horizontal driving unit for generating a horizontal driving voltage of a predetermined level based on the horizontal oscillation frequency signal, and reference II is a driving voltage pulse output from the horizontal driving unit I. Based on this, the horizontal output unit outputs a deflection signal for horizontal scanning of the electron beam.

Also, reference numeral V _DY denotes a vertical deflection coil for vertical deflection of the electron beam, and III denotes a vertical drive voltage of a predetermined level based on an oscillation pulse output from the vertical oscillation circuit 3c of the chroma IC 3. The vertical drive section IV is a vertical output section that outputs a vertical deflection signal based on the output signal of the vertical drive section III.

That is, according to the device having the above-described configuration, the chroma IC 3 has the horizontal oscillation frequency signal H _out and the vertical oscillation frequency generated based on the synchronization signal through the horizontal oscillation circuit 3b and the vertical oscillation circuit 3c. signal (V _out) bar, these oscillation frequency signal (H _out, V _out) being the output of each horizontal drive (ⅰ) and a horizontal output section (ⅱ) and the vertical output (ⅳ) via the vertical drive unit (ⅲ) By driving the deflection with respect to the electron beam emitted from the electron gun of the CRT 1 through the horizontal deflection coil (H _DY ) and the vertical deflection coil (V _DY ).

In addition, the ABL current sensing unit 3d inside the chroma IC 3 is provided with a 9 [V] supply power source that is a current source of anode high voltage. B ₂ ⁺ ) Detects the amount of current supplied to the anode terminal P side by detecting the potential of the A node based on the voltage value dropped by the anode resistor Ra. The image processor 3e detects the amount of current supplied to the anode terminal P. By adjusting the output levels of the color difference signal and the luminance signal with respect to the composite video signal based on the result detected by (3d), the output of the electron beam irradiated from the electron gun of the CRT 1 is adjusted.

On the other hand, while watching TV at home, people often leave their seats with the TV on, such as when a call comes in, a visitor rings with a visitor, or goes to a store in front of the house. In this state, even if for a while, there is a problem that the power is unnecessarily wasted because the TV is turned on in the absence of the viewer.

The present invention has been devised in view of the above circumstances, and when the viewer is recognized as being idle for a certain period of time, the viewer-sensitive power saving function for executing the power saving function by limiting the beam current of the video output stage is realized. The purpose is to provide a equipped television receiver.

1 is a circuit configuration diagram showing a horizontal / vertical deflection circuit of a typical television receiver.

Figure 2 is a circuit diagram showing the internal configuration of a television receiver with a viewer-sensitive power saving function according to an embodiment of the present invention.

3 is a view showing an example of installation of the far-infrared sensor S shown in FIG.

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

Ⅰ: Horizontal drive part Ⅱ: Horizontal output part

Ⅲ: vertical driving part Ⅳ: vertical output part

1: CRT 2: FBT (flyback transformer)

3: Chroma IC 3a: X-ray Protection

3b: horizontal oscillation circuit 3c: vertical oscillation circuit

3d: ABL current detector 3e: image processor

5: CRT driving unit 8: switching unit

10: timer 11: microprocessor

S: Far Infrared Sensor Q1, Q2: Transistor

Ra: load resistance P: anode electrode

H _DY : Horizontal deflection coil V _DY : Vertical deflection coil

A viewer-sensitized power-saving television receiver according to the present invention for realizing the above object is a CRT 1 for outputting a video screen by receiving a broadcast signal and a supply power source connected as an anode high-voltage current source of the CRT. B ₂ ⁺ In the television receiver equipped with), the far-infrared sensor (S) for detecting the presence of a viewer within a certain distance from the front of the TV and outputs a detection signal of the first level when the viewer is not detected, and the far-infrared sensor (S) Timer 10 for counting the viewer absence state detection time by the voltage, the voltage drop unit (R2, R3) provided in the power supply input terminal, based on the level of the voltage dropped by the voltage drop unit (R2, R3) The output level of the color difference signal and the luminance signal for the composite image signal CVS according to the detection result of the ABL current detection unit 3d and the detection result of the ABL current detection unit 3d for detecting an excessive supply state of the anode high voltage supply current amount. The image processing unit 3e for controlling the control unit and the switching unit 8 for varying the sensing voltage applied to the ABL current sensing unit 3d by interrupting short circuits at both ends of the voltage drop units R2 and R3 according to a predetermined control signal. , And the far infrared sensor (S) The elapsed time of the absence state of the viewer is counted through the timer 10 based on the level of the detection signal applied from the controller, and when the time counted by the timer exceeds a predetermined count value, the switching unit 8 is turned on. It characterized in that it comprises a control unit 11 for controlling to execute the power saving function by adjusting the sensing voltage by driving down.

That is, according to the present invention having the above-described configuration, it is possible to reduce unnecessary power consumption, thereby providing a television receiver with higher power saving efficiency, thus exerting an effect of increasing the competitiveness of the product.

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

Figure 2 is a block diagram showing the internal configuration of a television receiver equipped with a viewer-sensitive power saving function according to an embodiment of the present invention, the same reference for the components that perform substantially the same function as the configuration shown in FIG. The numbers are omitted and the detailed description thereof is omitted.

2, reference numerals R2 and R3 denote supply power ( B ₂ ⁺ Is provided in parallel to the input terminal of the resistor constituting a resistance component equivalent to the conventional anode resistor Ra, and reference numeral 8 denotes the resistor R3 as the internal switching transistor Q1 is driven on / off. ) Is a switching unit for varying the sensing voltage applied to the ABL current sensing unit 3d of the chroma IC 3 by interrupting the electrical connection state between both ends. A pnp-type transistor Q1 connected to both ends of the resistor R3 and driven on / off switching according to a predetermined control signal applied through the base end, and connected between the base end and the emitter end of the transistor Q1. The potential difference therebetween is composed of a resistor R4 which is set to be the turn-on voltage of the transistor Q1.

Also, as shown in FIG. 3, the reference S detects whether there is a viewer within a certain distance from the TV viewing area, that is, the front of the TV, and detects high or low levels depending on whether the viewer is present or not. A far infrared sensor for outputting a signal, reference numeral 10 denotes a timer for counting the elapsed time of the absent state of the viewer according to a predetermined control signal, and 11 denotes the timer 10 based on a level of a detection signal applied from the far infrared sensor S. FIG. The microprocessor as a control unit for counting the elapsed time of the absent state of the viewer and outputting a predetermined control command for the power saving mode operation when the time counted by the timer 10 exceeds a predetermined count value.

Reference numeral Q2 is a transistor as a switching driver for driving on / off in accordance with a control command output from the microprocessor 11 to drive control of a switching unit to be described later. Reference numeral R6 denotes an operation of the transistor Q2. Resistance to stabilize.

Next, the operation of the device having the above configuration will be described.

In the state where the TV receiver is turned on by the user and is operating normally, the switching transistor Q1 inside the switching unit 8 is in an OFF state, and thus the power supply applied to the node A B ₂ ⁺ ) Is lowered as the voltage level in the normal range by the resistors R2 and R3 and applied to the ABL current sensing unit 3d. Therefore, there is no restriction on the beam current, so that the electron beam is in a normal state. Will be scanned on the screen.

On the other hand, if a situation occurs such as a call coming in during TV viewing or a visitor ringing the doorbell, or the viewer leaving the room for a while with the TV on, such as when a viewer goes to a store in front of the house, The low level detection signal is output from the far infrared sensor S. When the low level signal is applied from the far infrared sensor S, the microprocessor 11 drives the timer 10 so that the viewer is absent. The elapsed time of the state is counted.

As a result of counting the elapsed time of the viewer absent, if the count value of the timer 10 exceeds the contracted value (for example, 20 seconds), that is, if the viewer does not return to the seat within the contracted time, the microprocessor 11 performs the P2 terminal. A high level control command for the power saving mode operation is output through the bar. As a result, a high level signal is applied to the base terminal of the switching driving transistor Q2, and the transistor Q2 is driven on. A low level switching signal is applied to the base terminal of the switching transistor Q1 included in the switching unit 8.

On the other hand, as described above, the transistor Q1 in the switching unit 8 is formed of a pnp type transistor. When the switching driving transistor Q2 is turned on, a low level switching signal is applied to the base end. The resistor R4 sets the base end potential of the transistor Q1 to be lower than the emitter end potential by a predetermined potential, thereby causing the switching transistor Q1 to be turned on.

As a result, a short circuit between the emitter terminal and the collector terminal of the switching transistor Q1 forms a new current path not passing through the resistor R3. Therefore, the sensing voltage applied to the ABL current sensing unit 3d is a resistor. It rises by the amount of potential corresponding to the falling voltage at (R3).

On the other hand, when the sensing voltage applied to the ABL current sensing unit 3d rises, the ABL current sensing unit 3d outputs a detection signal corresponding to the increased potential to the image processing unit 3e, and thus the image processing unit 3e. ) Lowers the amount of beam current supplied through the anode terminal P by adjusting the output level of the color difference signal applied to the CRT driving unit 5 based on the level of the sensing signal applied from the ABL current sensing unit 3d. do.

As a result, the image of the power saving mode in which the luminance level is adjusted to the predetermined value or less is output on the CRT screen, and the power corresponding to the downwardly adjusted beam current amount is saved.

On the other hand, when the viewer who has been away for a while returns to the viewing position, the far-infrared sensor S detects the viewer and outputs a high level detection signal. Accordingly, the microprocessor 11 causes the timer 10 to be output. In addition, the switching driving transistor Q2 is turned off by resetting and outputting a low level control command through the P2 terminal.

As a result, the transistor Q1 in the switching unit 8 is turned off, and the potential of the node A is normally dropped by the resistor terminals R2 and R3 and applied to the ABL current sensing unit 3d. Therefore, the control signal corresponding to the normally restored sensing voltage is output from the ABL current sensing unit 3d to the image processing unit 3e, whereby the image processing unit 3e is applied to the CRT driver 5 side. By adjusting the output level of the color difference signal, the amount of beam current supplied through the anode terminal P is increased to a normal level.

That is, according to the above embodiment, when a certain time elapses while the viewer is away, the television receiver with the viewer-sensitive power saving function can be realized by limiting the beam current of the video output terminal to execute the power saving function. do.

On the other hand, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention.

As described above, according to the present invention, since unnecessary power consumption can be reduced, it is possible to provide a television receiver with higher power saving efficiency, and thus, an effect of increasing the competitiveness of the product can be obtained.

Claims (2)

CRT 1 for outputting a video screen by receiving a broadcast signal and a supply power source connected as an anode high voltage current source of the CRT ( B ₂ ⁺ In a television receiver equipped with Far-infrared sensor (S) for detecting the presence of a viewer within a certain distance from the front of the TV and outputs a detection signal of the first level when the viewer is not detected, A timer 10 for counting a viewer absence state detection time by the far infrared ray sensor S, Voltage drop parts R2 and R3 provided at the supply power input terminal, An ABL current detection unit 3d for detecting an excessive supply state of the anode high voltage supply current amount based on the level of the voltage dropped by the voltage drop units R2 and R3, An image processor 3e for adjusting output levels of the chrominance signal and the luminance signal with respect to the composite video signal CVS in accordance with the detection result by the ABL current sensor 3d, A switching section 8 for varying a sensing voltage applied to the ABL current sensing section 3d by interrupting short circuits across the voltage drop sections R2 and R3 in accordance with a predetermined control signal, and Counting the elapsed time of the absent state of the viewer through the timer 10 on the basis of the level of the detection signal applied from the far infrared sensor S, and when the time counted by the timer exceeds a predetermined count value, the switching And a control unit (11) for controlling the power saving function to be executed by driving the unit (8) on and down to adjust the sensing voltage. The pnp transistor of claim 1, wherein the switching unit has an emitter terminal and a collector terminal respectively connected to both ends of the voltage drop sections R2 and R3 and driven on / off by switching according to a predetermined control signal applied through a base terminal. When the low level switching signal is applied to the base terminal and is connected between the base terminal and the emitter terminal of the transistor Q1, the potential difference between both ends is the turn-on voltage of the transistor Q1. A television receiver having a viewer-sensitive power saving function, comprising a resistor (R4) to be set to be.