KR101833992B1 - Power saving method of monitor - Google Patents

Abstract

The present invention relates to a method for reducing the power consumption of a monitor. The method is used to automatically reduce the power consumption of a monitor by using a brightness sensor and a D-sub output signal output from a computer to an LCD monitor in a complex manner. A monitor power consumption reducing device includes: a brightness sensing unit which senses the brightness on the outside of the monitor; an image input and output (I/O) unit which processes and displays images transmitted from the computer body, outputs the D-sub signal received from a D-sub connector receiving video signal from the computer body as a power-saving signal, and outputs a dimming signal for controlling the power of a backlight board based on the brightness sensing signal generated after the sensing operation of the brightness sensing unit; a power consumption control unit which recognizes the operation status of the computer body based on the D-sub signal, controls the power supply to the image I/O unit in the monitor in a self-initiated manner in accordance with the operation status of the computer body, and reduces the power consumption; and a power supply unit which controls the power supply of the backlight board providing the backlight in accordance with the dimming signal to reduce the power consumption of the monitor when the computer body operates.

Description

Power saving method of monitor [

[0001] The present invention relates to a power consumption reduction of a monitor, and more particularly, to a method of reducing power consumption of a monitor by using a D-sub output signal output from a computer (LCD monitor) And a method of reducing power consumption of a monitor so as to reduce power consumption.

In general, the computer turns off the display in standby mode (power saving mode), which uses only a minimal amount of power during use, or in off mode, in which the monitor is turned off. At this time, the monitor screen is turned off, Power is consumed continuously. That is, standby power is continuously supplied to the video board (AD board) of the monitor even when the screen is turned off, thereby consuming standby power.

Such standby power consumption is an unnecessary power waste, which causes waste of energy and causes pollution of the environment due to generation of carbon dioxide.

Therefore, various researches have been conducted to solve the environmental pollution problem by preventing the waste of electric power by cutting off the power supply while suppressing the generation of carbon dioxide while disconnecting the plug for supplying the commercial power to the monitor.

In the following Patent Document 1 to Patent Document 12, a technique proposed in the past for power saving of a monitor is disclosed.

The prior art disclosed in Patent Document 1 includes a step of judging a change of image data inputted from the outside, a time when the image data is not changed,

Comparing the time with the set time, minimizing the brightness of the screen when the measured time is equal to or greater than the set time, determining a change in the video data after minimizing the brightness of the screen, , And restoring the brightness of the screen to the original brightness. This configuration maximizes the power consumption of computer video monitors.

The conventional technique disclosed in Patent Document 2 reduces the amount of current of the backlight depending on the contrast state of the image or the brightness and contrast of the image. In particular, when the contrast of the image is less than the reference value, , The amount of current of the backlight is maintained at the predetermined value, thereby enabling the power consumption to be effectively reduced according to the change of the image state.

In addition, the prior art disclosed in Patent Document 3 includes a user sensor for outputting a user sensing signal, a switch for turning on / off a power to the user sensing sensor, a monitor for sensing a user's presence according to a signal applied from the user sensing sensor, And a control unit for controlling the user detection sensor to operate at a predetermined cycle by switching on / off the switch when the user enters a power saving mode and a user detection signal is input in a power saving mode, It operates in normal mode and converts the monitor to sleep mode while the user is away, thereby further enhancing user convenience and saving power.

In addition, in the prior art disclosed in Patent Document 4, an infrared sensor for detecting a human body is attached to a front surface of a monitor panel, and the power of the monitor is controlled according to presence or absence of a human body through a control board connected thereto.

In addition, the prior art disclosed in Patent Document 5 includes a power supply unit that receives external input power and provides operating power to the internal function unit, a switching unit that cuts off or turns on a power supply path of the input power supplied to the power supply unit according to the switching driving signal, A sensing and driving unit for providing a horizontal / vertical synchronizing signal provided from a computer main body to the control unit and providing a switching driving signal to the switching unit under the control of the control unit, And a control unit for providing a control signal for cutting off an input power to the sensing and driving unit and providing a control signal for supplying an external input power to the sensing and driving unit when a synchronous signal is sensed.

With this configuration, when the computer is in the power saving mode or the power off state, the power consumed by the display device and the standby power are cut off, thereby realizing power saving.

In addition, the prior art disclosed in Patent Document 6 allows a computer system to enter a power saving mode by using a computer system for saving power and a monitor power saving control mode, and is not required to press the power button of the monitor separately when returning from the power saving mode of the computer system A power control device and method for a monitor and a computer system that cause the power to be turned on are provided.

Also, the prior art disclosed in Patent Document 7 provides an apparatus and a method for controlling power of a monitor and a computer system in which both sides are simultaneously turned off even when power is turned off between the monitors and the computer system.

The conventional technology disclosed in Patent Document 8 is a PWM controller that generates a pulse width modulation signal based on a detection result of sensing an internal state and switches an AC power input according to a pulse width modulation signal generated in the PWM controller Generating a power control signal in accordance with a detection result of detecting an internal state of the power supply switching unit and the power supply unit, converting the pulse width modulation signal into digital data, calculating a power amount based on the converted digital data, And a power manager for controlling the power output according to the detected result of detecting the power amount and the internal state and the event set value set through the external interface.

With this configuration, a power supply such as a switching mode power supply (SMPS) analyzes the power output situation, detects the power internal state, and controls the power inside according to the set information.

In addition, the prior art disclosed in Patent Document 9 includes an auxiliary power switch for inputting a computer use signal, a standby power supply for generating a standby power during operation of the auxiliary power switch, supplying standby power to the computer main board, And a power supply unit for generating a main power when the main power request is generated and supplying the main power together with the standby power, and for controlling the standby power and the main power generation when a main power interruption request is issued from the computer main board.

This configuration reduces power consumption by eliminating the standby power output from a power supply such as a switching mode power supply (SMPS) that is applied to a computer.

In addition, the prior art disclosed in Patent Document 10 includes a computer main body for generating a digital interface signal for controlling a standby power of a monitor, and a digital interface signal generated from the computer main body as a power control signal, Wherein the computer is configured to implement a power shutdown device,

The digital interface signal is generated differentially according to the power, the power off state, and the power saving state, and the power of the monitor is automatically controlled by the computer body without user's operation.

In addition, the prior art disclosed in Patent Document 11 has a function of rectifying the input commercial power, generating standby power to supply standby power to the main board, and standby A power supply unit for measuring a residual power supplied from the standby power supply unit after the standby power is cut off, calculating a load amount by calculating an exhaustion time of the residual power, and generating standby power of the standby power supply unit according to the calculated load amount And a standby power control unit for controlling the standby power.

With this configuration, power consumption is minimized by minimizing standby power in a device using a power supply such as an SMPS.

In addition, the prior art disclosed in Patent Document 12 uses a DVI (Digital Visual Interface) signal output from a main body to a monitor and a signal output of a monitor power supply device (for example, SMPS) off mode, and when the off mode is detected, all signal output is cut off, thereby maximizing the power consumption.

Korean Patent Laid-Open No. 10-2004-0029220 (Apr. 04, 2004) (Power Saving Method of LCD Monitor) Korean Registered Patent No. 10-0628153 (Registered on Sep. 19, 2006) (Device and Method for Reducing LCD Power Consumption) Korean Patent Laid-Open No. 10-2006-0131228 (Dec. 20, 2006) (Monitor Power Control Device and Method) Korean Patent Laid-open Publication No. 10-2011-0049043 (May 12, 2011) (Method of controlling monitor power through human body infrared ray detection) Korean Patent Laid-Open No. 10-2011-0081019 (Published on July 13, 2011) (Monitors having a Standby Power Interruption Structure) Korean Registered Patent No. 10-1330212 (Registered Nov. 11, 2013) (Power control apparatus and method for monitor and computer system) Korean Registered Patent No. 10-1330217 (Registered Nov. 11, 2013) (Power Control Device for Monitor and Computer System and Method Thereof) Korean Registered Patent No. 10-1443316 (Registered on September 16, 2014) (Power supply unit with built-in management function) Korean Registered Patent No. 10-1481743 (Registered on May 1, 2015) (Power supply without standby power for computer) Korean Patent Publication No. 10-2015-0123435 (published on April 11, 2015) (Monitoring Standby Power Cutoff Device through Computer Interlocking) Korean Registered Patent No. 10-1416585 (Registered on Apr. 2, 2014) (Standby power control device of power supply device and method thereof) Korean Registered Patent No. 10-1623089 (Registered on May 16, 2016) (Power Consumption Reduction Device for Monitor)

However, the above conventional techniques have the following disadvantages.

First, although power control of the monitor is possible in conjunction with the main body, there is an inconvenience that a separate power device such as a power supply (SMPS) that supplies power is used.

Second, it is possible to save electricity by turning off the backlight driving power of the monitor in the power saving mode or the off mode. However, the driving power (DC 5V) is supplied to the image processing board (AD board) There are disadvantages.

Third, there is a drawback that in a normal computer environment, the power consumption of the monitor can not be reduced through the backlight power control of the monitor according to the illuminance of the monitor itself.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a digital signal processing apparatus, And to provide a method of reducing the power consumption of a monitor so that the power consumption of the monitor itself can be automatically reduced.

According to an aspect of the present invention, there is provided an apparatus for reducing power consumption of a monitor, A signal processing apparatus for processing and displaying an image transmitted from a computer main body and outputting a power saving signal to a de-sub signal received through a de-sub connector for receiving a video signal of a computer main body, A video input / output unit for outputting a dimming signal for power control of the backlight board as a basis; And a controller for controlling the power supplied to the video input / output unit according to an operation state of the computer main body to recognize the operation state of the computer main body based on the de-sub signal output from the video input / A power consumption control unit; And a power supply unit for controlling power of a backlight board that provides a backlight according to a dimming signal output from the video input / output unit to reduce power consumption of the monitor in a normal operation state of the computer.

In this case, the de-sub signal is a horizontal synchronizing signal (H sync) or a + 5V signal.

The video input / output unit generates a plurality of levels of dimming signals for differentially controlling the power of the backlight board according to the illuminance level sensed by the illuminance sensing unit.

The power consumption control unit includes a de-sub signal input terminal receiving the de-sub signal from the video input / output unit; And a controller for recognizing an operation state of the computer main body by analyzing the level of an arbitrary signal among the de-sub signals inputted through the de-sub signal input terminal, and if the recognized operation state of the computer main body is the standby mode or the off mode, A microcomputer for generating a signal; And a power cutoff unit for cutting off power supplied from the power supply unit to the video input / output unit according to a power cutoff signal generated by the microcomputer to reduce power consumption.

The microcomputer analyzes the presence or absence of a horizontal synchronization signal among the de-sub signals, and when the horizontal synchronization signal is not detected, the microcomputer cuts off the power of the backlight board and cuts off the power of the video input / output unit, thereby reducing power consumption of the monitor .

According to an aspect of the present invention, there is provided a method of reducing power consumption of a monitor, the method comprising: (a) confirming whether a synchronization signal is transmitted from a main body when a power button of the monitor is turned on; (b) if the synchronizing signal is detected, the operation state of the illuminance sensor is checked, and if the illuminance sensor is in the operating state, the illuminance value is obtained and the supply power of the backlight board is controlled according to the obtained illuminance level, Saving step; (c) confirming the illuminance change, the presence or absence of the horizontal synchronizing signal, and the operation state of the power button in a state of controlling the power consumption of the monitor as in the step (b); (d) controlling the power consumption of the monitor through the power control of the backlight board and the video input / output unit when the illumination change is detected or the horizontal synchronization signal is not detected or the power button is operated in the off state according to the result of the checking in the step (c) The method comprising the steps of:

In the step (b), the power of the backlight board is controlled differentially according to the sensed illumination level.

The step (d) includes the steps of: (d1) controlling the supply power of the backlight board according to the illuminance level according to the sensed illuminance value when the illuminance change is sensed; (d2) if the horizontal synchronization signal is not detected, turning off the power of the backlight board to primarily reduce power consumption of the monitor, and secondly to reduce power consumption of the monitor by shutting off the power of the video input / (d3) When the power button is turned off, the power-off mode is entered, and power consumption of the monitor is reduced by shutting down the power of the backlight board and the video input / output unit as the video board.

According to the present invention, by using the de-sub signal input from the computer main body and the illuminance around the monitor, the power of the backlight board and the image board is cut off or the power supply It is possible to minimize the power consumption of the monitor itself separately from the power saving of the computer main body.

1 is a configuration diagram of an apparatus for reducing power consumption of a monitor according to the present invention,
FIG. 2 is an installation view of the illuminance sensor applied to FIG. 1,
FIG. 3A is a diagram illustrating brightness of a monitor according to driving of a main body in a conventional computer system, FIG. 3B is a diagram illustrating brightness of a monitor according to driving of the main body in the computer system according to the present invention,
4 is a flowchart illustrating a method of reducing power consumption of a monitor according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and method for reducing power consumption of a monitor according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a power consumption reducing apparatus of a monitor according to a preferred embodiment of the present invention. The power supply unit 10, the power consumption control unit 20, the video input / output unit 30, the backlight board 40, (50) and an illuminance detection unit (60).

The power supply unit 10 is a device for supplying driving power to the monitor, and it is preferable to use a power supply device such as a general switching mode power supply (SMPS). The SMPS applied to the monitor supplies a + 5V supply and a + 16V supply. The power supply unit 10 may use a device such as an adapter that is embedded in a monitor or supplies power to the monitor from outside the monitor.

As shown in FIG. 2, the illuminance sensing unit 60 is installed at a predetermined position of the monitor 1, and serves to sense the illuminance of the outside of the monitor 1. The illuminance sensor 60 may use an illuminance sensor 61 such as a generally known CdS or Ambient Light Sensor.

The power button 50 is a switch for turning on or off the power of the monitor 1. [

The video input / output unit 30 is an image board (AD board), which processes and displays an image transmitted from a computer main body, and receives a video signal from a computer main body through a D-SUB connector 31 And outputs the received de-sub signal as a power saving signal to the power consumption control section 20. Based on the illuminance detection signal sensed by the illuminance detection section 60, the dimming signal for dimming control of the power supply of the backlight board 40 signal.

The video input / output unit 30 outputs the power of the backlight board 40 to the differential signal output unit 40 in accordance with the illuminance level sensed by the illuminance sensing unit 60, It is preferable to generate a plurality of levels of dimming signals for control.

To this end, the video input / output unit 30 includes a Scaler IC 32 for video display, power saving signal output, and dimming signal output. The Scaler IC 32 is an image processing module basically provided on the video board of the monitor. The Scaler IC 32 applied to the present invention analyzes the illuminance level, and according to the analyzed illuminance level, the power of the backlight board 40 It is assumed that a program for generating a dimming signal for control is added.

The power consumption control unit 20 recognizes the operation state of the computer main body based on the de-sub signal (+ 5V, H-sync) output from the video input / output unit 30, Output unit 30 to control the power of the monitor itself to reduce power consumption.

The power consumption control unit 20 includes a de-sub signal input terminal 21 receiving a de-sub signal from the video input / output unit 30, a de-sub signal input terminal 21 receiving the de- A microcomputer 22 for recognizing an operation state of the computer main body by analyzing the level of an arbitrary signal among the signals and generating a power down signal when the recognized operation state of the computer main body is the standby mode or the off mode, And a power cutoff unit 23 for cutting off power supplied from the power supply unit 10 to the video input / output unit 30 according to a power cutoff signal generated by the power cutoff unit 23 to reduce power consumption.

The microcomputer 22 analyzes the presence or absence of a horizontal synchronization signal H-sync among the de-sub signals and notifies the power of the video input / output unit 30 It is desirable to reduce the power consumption of the monitor.

Preferably, the microcomputer 22 analyzes the level of the de-sub signal to determine the normal mode if the signal is at a high level, generates the off signal as an off signal, And if it is "low level", it is determined as a standby mode or an off mode, and the power shutdown signal is generated as an on signal.

The power supply unit 10 controls power of a backlight board 40 that provides a backlight according to a dimming signal output from the video input and output unit 30 to reduce power consumption of a monitor in a normal operation state of the computer .

The operation of the power saving device of the monitor according to the present invention will be described in detail as follows.

First, when the power button 50 of the monitor is turned on (the power button is pressed in the off state) and the initial power is supplied, the video input / output unit 30, which is the video board of the monitor, The Scaler IC 32 receives a video output signal output from the computer main body through a sub-D-SUB connector 31, and the Scaler IC 32 receives a luminance sensing value output from the luminance sensing unit 60. Here, when the computer main body is connected to a monitor, a video signal and communication data (including power saving data) are transmitted through the de-sub signal. In addition, the illuminance sensing unit 60 includes a separate illuminance sensor operation button for illuminance sensor operation so that the user can determine whether or not the illuminance sensor is operated.

When the video signal is received from the computer main body through the de-sub connector 31, the video input / output unit 30 receives the video signal and transmits the received video signal to the backlight board 40 so that an image is displayed on the monitor screen, And analyzes the illumination sensing value sensed by the sensing unit 60 to generate a dimming signal for controlling the power of the backlight board 40. At this time, it is assumed that the user has operated the illuminance sensor operation button to the ON state.

When the illuminance is detected through the illuminance sensor 61 of the illuminance detection unit 60, the Scaler IC 32 of the video input / output unit 30 searches the illuminance level look-up table that is preset with the detected illuminance value as an index And determines the illumination level. Here, the illuminance level is a preset value for reducing the backlight power consumption by controlling the brightness of the screen by controlling the power of the backlight board itself according to the illuminance value while the main body is operating normally. In the present invention, the illuminance level is set to the first to fourth levels, which means that the power of the backlight board is to be controlled differentially according to the change in the illuminance values. The illumination level is set to four, but the present invention is not limited to this, and it is obvious to those skilled in the art that the power source of the backlight board can be controlled differently by further subdividing or reducing the level will be. The illuminance level is a relationship of a first level (100%) <second level (85%) <third level (65%) <fourth level (50%).

When the illuminance is sensed, the Scaler IC 32 determines whether the sensed illuminance value belongs to one of the first to fourth levels, and when the illuminance value is at any level among the first to fourth levels If the illuminance value belongs to one of the first to fourth levels, a dimming signal for differentially controlling the power of the backlight board is generated corresponding to the illuminance value, (10).

For example, the illumination level look-up table is searched by the sensed illumination value, and a dimming signal for controlling the power supply of the backlight board 40 to the first control level is generated if the illumination level is the first level. Here, the first control level refers to a power control level that controls the power of the backlight board 40 to the minimum level to darken the brightness of the screen of the monitor 1 slightly. According to the dimming signal corresponding to the first control level, the power supply unit 10 controls the power supply of the backlight board 40 to darken the screen brightness a little.

As described above, in the state where the brightness of the screen is controlled through the power control of the backlight board 40, the illuminance is detected again after a predetermined period of time. The reason for setting the predetermined time here is that if the backlight board is controlled by continuously detecting the illuminance in real time, the brightness of the monitor screen is continuously adjusted according to the illuminance, so that it is inconvenient for the user to frequently adjust the screen brightness in an environment where the user uses the computer , So that a certain period of time has been taken into consideration. The predetermined time can be set in minutes, and it is preferable to set the time for maximizing the power saving efficiency of the monitor through experiments.

If the illuminance level is the first level, the current state is maintained. Otherwise, if the illuminance level is the second level, the backlight board (or the backlight board) 40 to a second control level. Here, the second control level controls the power of the backlight board 40 by maximizing the power of the backlight board 40 to a minimum, which is a power control level that makes the screen brightness of the monitor 1 darker than the first control level. According to the dimming signal corresponding to the second control level, the power supply unit 10 controls the power supply of the backlight board 40 to darken the screen slightly lower than the first control level. The second control level consumes less power consumption of the monitor as compared to the first control level.

As described above, the brightness of the screen is adjusted through the power control of the backlight board 40, and the illuminance is detected again after the predetermined period of time. If the illuminance level is the second level, the current state is maintained. If the illuminance level is the third level, the illuminance level look-up table is searched with the sensed illuminance value, 40 to a third control level. According to the dimming signal corresponding to the third control level, the power supply unit 10 controls the power supply of the backlight board 40 to darken the screen slightly lower than the second control level. Here, the third control level controls the power of the backlight board 40 by maximizing the power level of the backlight board 40 more than the second control level, and means a power control level that darkens the screen brightness of the monitor 1 to a level lower than the second control level. The third control level consumes less power consumption of the monitor as compared to the second control level.

In addition, the brightness of the screen is controlled through the power control of the backlight board 40 as described above, and the illuminance is detected again after the predetermined period of time. If the illuminance level is the third level, the current state is maintained. If the illuminance level is the fourth level, the backlight board (or the backlight board) 40 to a fourth control level. In accordance with the dimming signal corresponding to the fourth control level, the power supply unit 10 controls the power supply of the backlight board 40 so that the screen brightness is slightly darker than the third control level. Here, the fourth control level controls the power of the backlight board 40 by maximizing the power level of the backlight board 40 more than the third control level, which means a power control level that makes the screen brightness of the monitor 1 darker than the second control level. The fourth control level consumes less power consumption of the monitor than the third control level.

Here, the power of the backlight board 40 is minimized or maximized, which means that the brightness of the screen is reduced by reducing the backlight power, and the backlight power consumption is reduced as the brightness of the screen is decreased.

When the illuminance is in the state before the backlight control during the control of the power consumption of the backlight, the backlight is returned to the original state without the power supply control.

FIG. 3A shows that, when the operation of the computer main body is turned on in the conventional computer system, the brightness state is maintained as in the upper monitor, and in the off state, the dark state is maintained as in the lower monitor.

In the conventional computer system, when the computer is normally used, the brightness is fixed irrespective of the illuminance. However, as shown in FIG. 3B, the brightness of the monitor varies according to the illuminance even when the computer main body operates normally, And the power consumption of the monitor itself is reduced.

If the method of reducing the power consumption of the monitor by controlling the power of the backlight board according to the illuminance in this way is used, the user can go out for a long time without using power off , The power consumption of the monitor itself can be reduced, and the power consumption of the monitor compared to the conventional computer can be drastically reduced.

As described above, according to the present invention, the brightness of the screen is adjusted by controlling the power of the backlight separately from the main body of the computer according to the peripheral illuminance of the monitor, thereby reducing the power consumption of the monitor.

Meanwhile, according to the present invention, the power consumption of the monitor itself is reduced according to the illuminance, and the power consumption of the monitor itself is reduced through interlocking with the computer main body.

For example, the video input / output unit 30 transmits a de-sub signal input through the de-sub connector 32 to the power consumption controller 20.

The power consumption control unit 20 receives the de-sub signal output from the video input / output unit 30 through the de-sub signal input terminal 21 and is transmitted to the microcomputer 22. Here, the de-sub signal includes an analog horizontal synchronizing signal H_sync and a power supply signal (+ 5V). In addition, the microcomputer 22 receives an operation signal of a power button through a power switch input terminal. The microcomputer 22 receives the de-sub signal output from the de-sub signal input terminal 21 and the operation signal of the power button through the power switch input terminal, And the power button operation signal to the power button control operation is prioritized.

For example, whatever the de-sub signal is input, if the power button off signal is input, the power of the monitor is turned off, and when the power button on signal is input, the power of the monitor is turned on.

In a state in which driving power is supplied to the monitor, the microcomputer 22 detects and analyzes the de-sub signal. Here, there are two types of the de-sub signal as described above, and the microcomputer 22 can use either of the two signals. One of the two signals is referred to as a specific signal, and it is assumed that a horizontal synchronizing signal (H_sync) is used in the present invention.

The microcomputer 22 analyzes a specific signal among the de-sub signals and recognizes the operation state of the computer. For example, the presence or absence of the specific signal is checked, and if a specific signal is present (electrically + 5V, high signal) ", it is determined as a normal mode and a power off signal is generated as an off signal. If the specific signal does not exist (electrically, 0V means low signal), it is determined as a standby mode or an off mode, and the power shutdown signal is generated as an on signal.

The power cutoff signal generated by the microcomputer 22 is applied to the power cutoff unit 23. When the power cutoff signal applied to the power cutoff unit 23 is an off signal, To the video input / output unit 30, the driving power (+5 V dc) For example, the power supply unit 10 and the video input / output unit 30 are electrically connected to each other.

The power cutoff unit 23 operates in a state where the switch is in the open state and the driving power source (+5 V dc) output from the power supply unit 10 is connected to the video input / output unit 30, . For example, the power supply unit 10 and the video input / output unit 30 are electrically disconnected to fundamentally prevent power consumption in the video board. Thus, at the time of the standby mode or the off mode, the driving power source (main power source) is not applied to the video input / output unit 30, which is the video board, so that unnecessary power consumption is prevented. As a result, the power consumption of the monitor can be reduced.

The power-off signal corresponding to the generated on-state is also applied to the power supply unit 10, and the power supply unit 10 cuts off the LED drive supply power supplied to the backlight board 40. As described above, when the horizontal synchronization signal is not detected, the driving power of the backlight board 40 and the video input / output unit 30 is completely cut off, thereby reducing the power consumption of the monitor itself.

In the state where the power supply unit 10 and the video input / output unit 30 are electrically disconnected as described above, the microcomputer 22 continuously detects and analyzes the de-sub signal. Even when the power supply unit 10 and the video input / output unit 30 are electrically disconnected, the de-sub signal output from the computer main body is applied to the power switching unit 20 through the video input /

When the microcomputer 22 continuously detects and analyzes the de-sub signal, when the specific signal of the de-sub signal is transited to the "high level " again, the microcomputer 22 recognizes the normal mode, To the power supply unit 10 and the power cutoff unit 23. [

The power supply unit 10 resumes supplying the LED drive power to the backlight board 40 when the applied power shutdown signal is an off signal and the power shutoff unit 23 switches the power shutoff signal And returns to the original state to supply the driving power (+5 V dc) output from the power supply unit 10 to the video input / output unit 30. For example, the power supply unit 10 and the video input / output unit 30 are electrically connected to each other.

Thus, the video input / output unit 30 operates normally and displays an image transmitted from the computer main body on the screen.

As described above, according to the present invention, the brightness of the monitor is automatically controlled or the power of the backlight board is shut off through the power control of the backlight board according to the illuminance of the surroundings of the monitor using the video signal and the illuminance sensor, , The main power of the video board is cut off, so that power consumption consumed in the video board can be prevented even in the standby mode or the off mode, and it is also very convenient for the user.

FIG. 4 is a flowchart illustrating a method of reducing power consumption of a monitor according to the present invention. FIG. 4 is a flowchart illustrating a method of reducing power consumption of a monitor according to the present invention. Referring to FIG. 4, (b) if the synchronization signal is detected, the operation state of the illumination sensor is checked. If the illumination sensor is in operation, the controller acquires the illumination value and controls the supply power of the backlight board according to the acquired illumination level, (S104 to S107); (c) checking the presence or absence of the horizontal synchronization signal and the operation state of the power button in the state of controlling the power consumption of the monitor as in the step (b) , S109, S111, and S117), (d) if the illumination change is detected or the horizontal sync signal is not detected or the power button is turned off according to the result of the checking in step (c), the power supply of the backlight board and the video input / (S110, S112 to S114, and S118 to S121) of controlling the power consumption of the monitor through the wireless communication unit, (e) if a synchronization signal is detected from the computer main body during the step (d) And starting the monitoring operation according to the PC rebooting (S115 to S116).

In the step (b), it is preferable that the power of the backlight board is controlled differentially according to the sensed illumination level.

The step (d) may further include the steps of: (d1) controlling the supply power of the backlight board according to the illuminance level in accordance with the sensed illumination value (S109, S110) If the horizontal sync signal is not detected, the power of the backlight board is firstly turned off to reduce the power consumption of the monitor, and the power of the video input / output unit, which is the video board, is immediately cut off after the power supply of the backlight board is cut off. (D3) when the power button is operated to the off state, the power-off mode is entered, and power consumption of the monitor is reduced by shutting off the power of the backlight board and the video input / output unit as the video board S117 to S121).

A method of reducing the power consumption of the monitor according to the present invention will now be described in detail.

First, in step S101, when the power button 50 of the monitor 1 is turned on (the power button is pressed in the off state) and the initial power is supplied, The video input and output unit 30 which is a video board of the video display unit 30 receives a video output signal outputted from the computer main body through a D-sub connector 31 and the Scaler IC 32 And receives the output of the illuminance detection value. Here, when the computer main body is connected to a monitor, a video signal and communication data (including power saving data) are transmitted through the de-sub signal. In addition, the illuminance sensing unit 60 includes a separate illuminance sensor operation button for illuminance sensor operation so that the user can determine whether or not the illuminance sensor is operated.

When the video signal is received from the computer main body through the de-sub connector 31 as shown in step S103, the video input / output unit 30 receives the video signal and transmits the video signal to the backlight board 40 so that the video is displayed on the monitor screen And simultaneously generates a dimming signal for controlling the power of the backlight board 40 by analyzing the illumination sensing value sensed by the illumination sensing unit 60. At this time, it is assumed that the user operates the illuminance sensor operation button in the ON state (S104).

The Scaler IC 32 of the video input and output unit 30 outputs the detected illuminance value to the illuminance level look-up table 62, which is previously set with an index, when the illuminance is detected through the illuminance sensor 61 of the illuminance detection unit 60 in step S105 To determine the illumination level. Here, the illuminance level is a preset value for reducing the backlight power consumption by controlling the brightness of the screen by controlling the power of the backlight board itself according to the illuminance value while the main body is operating normally. In the present invention, the illuminance level is set to the first to fourth levels, which means that the power of the backlight board is to be controlled differentially according to the change in the illuminance values. The illumination level is set to four, but the present invention is not limited to this, and it is obvious to those skilled in the art that the power source of the backlight board can be controlled differently by further subdividing or reducing the level will be. The illuminance level is a relationship of a first level (100%) <second level (85%) <third level (65%) <fourth level (50%).

If the scale factor IC 32 detects the roughness as in step S106, the Scaler IC 32 proceeds to step S107 to determine which level of the first to fourth levels the sensed roughness value belongs to, The power saving function is not implemented unless it belongs to any one of the first to fourth levels. Alternatively, if the sensed illumination value belongs to one of the first to fourth levels, And transmits the generated dimming signal to the power supply unit 10.

For example, the illumination level look-up table is searched by the sensed illumination value, and a dimming signal for controlling the power supply of the backlight board 40 to the first control level is generated if the illumination level is the first level. Here, the first control level refers to a power control level that controls the power of the backlight board 40 to the minimum level to darken the brightness of the screen of the monitor 1 slightly. According to the dimming signal corresponding to the first control level, the power supply unit 10 controls the power supply of the backlight board 40 to darken the screen brightness a little.

As described above, in the state where the brightness of the screen is controlled through the power control of the backlight board 40, the illuminance is detected again after a predetermined period of time. The reason for setting the predetermined time here is that if the backlight board is controlled by continuously detecting the illuminance in real time, the brightness of the monitor screen is continuously adjusted according to the illuminance, so that it is inconvenient for the user to frequently adjust the screen brightness in an environment where the user uses the computer , So that a certain period of time has been taken into consideration. The predetermined time can be set in minutes, and it is preferable to set the time for maximizing the power saving efficiency of the monitor through experiments.

If the illuminance level is the first level, the current state is maintained. Otherwise, if the illuminance level is the second level, the backlight board (or the backlight board) 40 to a second control level. Here, the second control level controls the power of the backlight board 40 by maximizing the power of the backlight board 40 to a minimum, which is a power control level that makes the screen brightness of the monitor 1 darker than the first control level. According to the dimming signal corresponding to the second control level, the power supply unit 10 controls the power supply of the backlight board 40 to darken the screen slightly lower than the first control level. The second control level consumes less power consumption of the monitor as compared to the first control level.

As described above, the brightness of the screen is adjusted through the power control of the backlight board 40, and the illuminance is detected again after the predetermined period of time. If the illuminance level is the second level, the current state is maintained. If the illuminance level is the third level, the illuminance level look-up table is searched with the sensed illuminance value, 40 to a third control level. According to the dimming signal corresponding to the third control level, the power supply unit 10 controls the power supply of the backlight board 40 to darken the screen slightly lower than the second control level. Here, the third control level controls the power of the backlight board 40 by maximizing the power level of the backlight board 40 more than the second control level, and means a power control level that darkens the screen brightness of the monitor 1 to a level lower than the second control level. The third control level consumes less power consumption of the monitor as compared to the second control level.

In addition, the brightness of the screen is controlled through the power control of the backlight board 40 as described above, and the illuminance is detected again after the predetermined period of time. If the illuminance level is the third level, the current state is maintained. If the illuminance level is the fourth level, the backlight board (or the backlight board) 40 to a fourth control level. In accordance with the dimming signal corresponding to the fourth control level, the power supply unit 10 controls the power supply of the backlight board 40 so that the screen brightness is slightly darker than the third control level. Here, the fourth control level controls the power of the backlight board 40 by maximizing the power level of the backlight board 40 more than the third control level, which means a power control level that makes the screen brightness of the monitor 1 darker than the second control level. The fourth control level consumes less power consumption of the monitor than the third control level.

Here, the power of the backlight board 40 is minimized or maximized, which means that the brightness of the screen is reduced by reducing the backlight power, and the backlight power consumption is reduced as the brightness of the screen is decreased.

When the illuminance is in the state before the backlight control during the control of the power consumption of the backlight, the backlight is returned to the original state without the power supply control.

If the method of reducing the power consumption of the monitor by controlling the power of the backlight board in accordance with the illuminance while the computer main body operates normally in this manner is used, even if the user normally uses the computer, the power consumption of the monitor itself is reduced In addition, the power consumption of the monitor itself can be reduced even when the user goes out for a long time without using the computer while the user is using the computer (for example, in the evening and at work in the morning) The power consumption of the monitor can be drastically reduced compared to a computer.

As described above, according to the present invention, the brightness of the screen is adjusted by controlling the power of the backlight separately from the main body of the computer according to the peripheral illuminance of the monitor, thereby reducing the power consumption of the monitor.

Meanwhile, according to the present invention, the power consumption of the monitor itself is reduced according to the illuminance, and the power consumption of the monitor itself is reduced through interlocking with the computer main body.

For example, the video input / output unit 30 continuously acquires the illumination detection value through the illumination sensor, as in steps S109 and S110, through the illumination sensing unit 60, The brightness is controlled through the power control of the backlight board 40 in the same manner as in step S107 to reduce the power consumption of the monitor itself and at the same time the de-sub signal input through the de-sub connector 31, (20).

The power consumption control unit 20 receives the de-sub signal output from the video input / output unit 30 through the de-sub signal input terminal 21 in step S111 and is transmitted to the microcomputer 22. [ Here, the de-sub signal includes an analog horizontal synchronizing signal H_sync and a power supply signal (+ 5V). In addition, the microcomputer 22 receives an operation signal of a power button through a power switch input terminal. The microcomputer 22 receives the de-sub signal output from the de-sub signal input terminal 21 and the operation signal of the power button through the power switch input terminal, And the power button operation signal to the power button control operation is prioritized.

For example, if the power button-off signal is input as in steps S117 and S118, regardless of which of the de-sub signals is inputted, the process goes to step S119 to turn off the power of the monitor. .

When the power is turned off, the process proceeds to step S120, where the power consumption of the monitor is minimized by shutting off the driving power of the backlight board 40 and the video input / output unit 30, which is the video board, to step S121 Move and confirm that the power button is pressed again. When the power button is turned off and the power button is pressed again, the power is turned on, and the process goes to step S102 to perform the following operation.

Meanwhile, in a state where driving power is supplied to the monitor, the microcomputer 22 senses the de-sub signal as in step S111 and analyzes it in step S112. Here, there are two types of the de-sub signal as described above, and the microcomputer 22 can use either of the two signals. One of the two signals is referred to as a specific signal, and it is assumed that a horizontal synchronizing signal (H_sync) is used in the present invention.

The microcomputer 22 analyzes a specific signal among the de-sub signals and recognizes the operation state of the computer. For example, the presence or absence of the specific signal is checked, and if a specific signal is present (electrically + 5V, high signal) ", it is determined as a normal mode and a power off signal is generated as an off signal. If the specific signal does not exist (electrically, 0V means low signal), it is determined as a standby mode or an off mode, and the power shutdown signal is generated as an on signal.

The power cutoff signal generated by the microcomputer 22 is applied to the power cutoff unit 23 and the power supply unit 10.

The power supply unit 10 firstly cuts off the LED drive supply power supplied to the backlight board 40 in accordance with the power cutoff signal generated as in step S113.

In step S114, if the power off signal to be applied is an off signal, the power cutoff unit 23 does not operate the switch so that the driving power source (+5 V dc) output from the power supply unit 10 is supplied to the video input / . For example, the power supply unit 10 and the video input / output unit 30 are electrically connected to each other. The power cutoff unit 23 operates in a state where the switch is in the open state and the driving power source (+5 V dc) output from the power supply unit 10 is connected to the video input / output unit 30, . For example, the power supply unit 10 and the video input / output unit 30 are electrically disconnected to fundamentally prevent power consumption in the video board. Thus, at the time of the standby mode or the off mode, the driving power source (main power source) is not applied to the video input / output unit 30, which is the video board, so that unnecessary power consumption is prevented. As a result, the power consumption of the monitor can be reduced.

As described above, when the horizontal synchronization signal is not detected, the driving power of the backlight board 40 and the video input / output unit 30 is completely cut off, thereby reducing the power consumption of the monitor itself.

In the state where the power supply unit 10 and the video input / output unit 30 are electrically disconnected as described above, the microcomputer 22 continuously detects and analyzes the de-sub signal as in step S115. Even when the power supply unit 10 and the video input / output unit 30 are electrically disconnected, the de-sub signal output from the computer main body is applied to the power switching unit 20 through the video input /

When the microcomputer 22 continuously detects and analyzes the de-sub signal, when the specific signal of the de-sub signal is transited to the high level again, the microcomputer 22 recognizes the de-sub signal as a normal mode and proceeds to step S116, Signal to an off signal and applies it to the power supply unit 10 and the power cut-off unit 23. [

The power supply unit 10 resumes supplying the LED drive power to the backlight board 40 when the applied power shutdown signal is an off signal and the power shutoff unit 23 switches the power shutoff signal And returns to the original state to supply the driving power (+5 V dc) output from the power supply unit 10 to the video input / output unit 30. For example, the power supply unit 10 and the video input / output unit 30 are electrically connected to each other.

Thus, the video input / output unit 30 operates normally and displays an image transmitted from the computer main body on the screen.

As described above, according to the present invention, the brightness of the monitor is automatically controlled or the power of the backlight board is shut off by controlling the power of the backlight board according to the illuminance of the surroundings of the monitor using the video signal and the illuminance sensor, , The main power of the video board is cut off, so that power consumption consumed in the video board can be prevented even in the standby mode or the off mode, and it is also very convenient for the user.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is obvious to those who have.

INDUSTRIAL APPLICABILITY The present invention is applied to a technique of reducing power consumption by itself in a peripheral device (monitor) connected to a computer.

10: Power supply
20: Power consumption controller
21: De-sub signal input terminal
22: Microcomputer
23:
30: Video input / output unit
31: D-Sub connector
32: Scaler IC
40: backlight board
50: Power button
60: Illumination detection unit

Claims (8)

delete delete delete delete delete A method for reducing the power consumption of a monitor itself by using a video output signal of a computer body and an illuminance around the monitor,
(a) confirming whether a synchronization signal is transmitted using a de-sub signal transmitted from a main body when a power button of the monitor is turned on;
(b) if the synchronizing signal is detected, the operation state of the illuminance sensor is checked, and if the illuminance sensor is in the operating state, the illuminance value is obtained and the supply power of the backlight board is controlled according to the obtained illuminance level, Saving step;
(c) confirming the illuminance change, the presence or absence of the horizontal synchronizing signal, and the operation state of the power button in a state of controlling the power consumption of the monitor as in the step (b); And
(d) controlling the power consumption of the monitor through the power control of the backlight board and the video input / output unit when the illumination change is detected or the horizontal synchronization signal is not detected or the power button is operated in the off state according to the result of the checking in the step (c) &Lt; / RTI &gt;
The de-sub signal is a horizontal synchronizing signal (H sync) or a + 5V signal,
The method of claim 1, wherein the step (b) comprises: controlling power of the backlight board differentially according to the sensed illumination level, wherein the step (b1) (b2) a step of controlling the power supply of the backlight board itself according to the operation state of the illuminance sensor even in a state where the computer main body normally operates as a result of the determination in the step (b1), thereby reducing power consumption,
The step (d)
(d1) controlling the supply power of the backlight board according to the illuminance level in accordance with the sensed illuminance value when the illuminance change is sensed;
(d2) If the horizontal synchronization signal is not detected, the power of the backlight board is cut off to primarily reduce the power consumption of the monitor, and the power of the video input / output unit, which is the video board, Reducing power consumption;
(d3) when the power button is operated to the off state, enters a power off mode, and reduces the power consumption of the monitor by shutting off the power of the backlight board and the video input / output unit as the video board Of power consumption.



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