KR101851218B1 - A method for controling a display having the power saving function by decting monitor pixels - Google Patents

Abstract

The present invention provides a method and a device for controlling a power saving type display, capable of improving power saving efficiency by automatically searching a monitor screen and determining whether to enter a power saving mode, in a simple method. In addition, the method and the device for controlling a power saving type display can reduce power consumption of a display without changing additional composition by a simple motion of turning on/off +19 V power to an inverter in the simple method by a clock signal (SCL) among video input signals and controlling an enable (EN) terminal signal of a power converter of an SMPS (20) by a micom (50) in a case of automatically entering the power saving mode by automatically searching the monitor screen. According to the present invention, the device for controlling a power saving type display includes: the SMPS (20) supplying the power to the display; an LED panel (80) operating by backlight of a display screen; the inverter (70) inverting voltage from the SMPS and supplying the same to the LED panel (80); a display control unit (30) controlling operation of the display; a connector (40) providing the video input signal from a main board to a monitor control unit; a key control unit (90) comprising buttons for setting the operation of the display; and the micom (50) directly controlling switching of a first power (DC_19V) supplied from the SMPS (20) to the inverter (70).

Description

[0001] The present invention relates to a control method of a power saving display having a self-diagnosis function of a monitor screen,

The present invention relates to a control method of a power saving display, and more particularly, to a control method of a power saving display capable of increasing a power saving efficiency by searching for a monitor screen by itself and determining whether to enter a power saving mode by itself.

In general, the computer turns off the display in the standby mode (power saving mode) or the monitor power off mode to reduce the power consumption. At this time, the monitor screen is turned off, but the power of the monitor is continuously supplied to consume power. That is, standby power is continuously supplied to the control board of the monitor even when the screen is turned off, resulting in unnecessary standby power consumption.

Accordingly, various researches have been conducted to prevent power wastage by cutting off the power supply without removing the plug for supplying the commercial power to the monitor. For example, Korean Patent Publication No. 2013-0109060 (referred to as " A standby power cut-off device) includes a power switching unit at a front end when power is supplied to a computer, and the standby power is cut off by turning off the power of the computer (peripheral) (monitor) as well as the computer when the power is turned off.

That is, the computer includes a power switching unit 20 that receives external commercial power and provides operating power to the internal components of the computer, an outlet power switching unit 19 for turning off / supplying power to the peripheral devices, 18). When the computer is in the standby mode (power save mode), the socket power switching unit 19 is controlled by using the memory power source to shut off the power (AC power) supplied to the computer peripheral device. Through this process, standby power is cut off and waste of power saving is prevented.

However, the first conventional technique has an advantage of preventing power consumption of a peripheral device in a power-off state or a power-saving mode of the computer. However, the power source switching unit 20, the outlet power switching unit 19, 18). Therefore, the configuration of the computer is complicated, and the implementation cost of the device for saving power is large, so that it is difficult to apply it to the actual computer and peripheral devices easily.

As a second conventional technique for solving this problem, Korean Patent Laid-Open Publication No. 2015-0123435 (a monitor stand-by power interrupter through computer interworking) has been disclosed. In the second conventional technique, The present invention provides a monitoring standby power cut-off device through computer interworking which automatically cuts off standby power of a monitor by using a VGA signal and supplies power to a monitor automatically when the computer is driven to minimize user's operation to improve convenience will be.

That is, according to the second conventional technique, the stand-by power of the monitor can be shut off by using only the VGA signal transmitted from the existing computer to the monitor, without adding a separate configuration for shutting down standby power of the monitor in the computer, The present invention provides a monitor power cut-off device through interworking with a computer so as to simplify a configuration for blocking standby power of a computer and minimize a device implementation cost.

2 and 3, the monitor stand-by power cut-off device through computer interlocking according to the second conventional technique includes an input device 10, a computer main body 100, (200). The computer main body 100 generates a digital interface signal (DVI signal) for controlling standby power of the monitor 200 and transmits it to the monitor 200. The computer main body 100 includes an input / output board 110 for interfacing an input signal of the input device 10, a power supply unit 140 for supplying driving power to the computer main body 100, A central processing unit (CPU) 120 for determining the use state or nonuse state of the computer based on an input signal or a switch operation signal and controlling the output of the digital interface signal according to the determined state of the computer, A VGA board 150 for generating a digital interface signal to the monitor 200 under the control of the central processing unit 120 and a memory 130 connected to the central processing unit 120.

Here, the computer main body 100 preferably generates the digital interface signals differentially according to the power-on state, the power-off state, and the power-saving state.

The VGA signal is generated as a high signal (5V) during the power-on state, and the VGA signal is generated when the power-off state Or in a power saving state, the VGA signal is generated as a low signal (0V).

The monitor 200 serves to cut off or supply power by using a digital interface signal generated from the computer main body 100 as a power control signal.

The monitor 200 includes a video connector 220 for interfacing with a digital visual interface (DVI) output from the computer main body 100, a video connector 220 for switching according to a digital interface signal received by the video connector 220, A direct current voltage cutoff unit 230 for shutting off or supplying the monitor operation power DC12V output from the mode power supply 210 to control the power, And a monitor control board 240 for controlling the overall operation of the monitor. Here, when the computer main body 100 and the video connector 220 are connected by the HDMI (High-Definition Multimedia Interface) method, the digital interface signal is replaced with the HDMI signal.

As shown in FIG. 2, the direct current voltage cutoff unit 230 includes a switching device Q1 for switching according to a digital interface signal (DVI signal) output from the video connector 220; And a MOSFET 231 for interrupting or supplying the monitor operation power in cooperation with the switching element Q1.

The switching element Q1 uses a field effect transistor (FET), the digital interface signal is connected to the base of the field effect transistor Q1, and the gate of the MOSFET 231 is connected to the collector of the field effect transistor The monitor operation power source is connected to the source of the MOSFET 231 and the output terminal of the monitor operation power source is connected to the drain of the MOSFET 231.

Thus, when power is normally supplied to the computer main body 100 and the input signal of the input device 10 is checked, the central processing unit 120 controls the VGA board 150 in a use mode other than the power saving mode So that the digital interface signal DVI5V is generated normally (high signal). Here, the VGA board 150 normally transmits the digital interface signal to the monitor 200 using the pin # 9. The generated digital interface signal is transmitted to the monitor 200 and transmitted to the DC voltage intercepting unit 230 through the video connector 220 of the monitor 200. Here, the video connector 220 transmits the input digital interface signal to the DC voltage cutoff unit 230 using the pin 14.

As shown in FIG. 3, the DC voltage intercepting portion 230 has the base of the switching element Q1 at a high potential by the high-level digital interface signal, and the switching element Q1 is turned on. When the switching element Q1 is turned on, the potential of the gate of the P-type MOSFET 231 connected to the collector is lowered to turn the MOSFET 231 on. When the MOSFET 231 is turned on, the monitor operation power DC12V output from the switching mode power supply 210 connected to the source of the MOSFET 231 flows to the drain to supply the monitor operation power to the monitor control board 24 do. Thus, the monitor 200 operates normally and displays the corresponding data on the screen.

That is, in a state where the computer main body 100 operates normally, the VGA signal is normally generated and transmitted to the monitor 200, and the monitor 200 monitors the monitor operation generated by the switching mode power supply using the normal VGA signal Supply power to the monitor control board normally so that the monitor operates normally.

The central processing unit 120 can not normally control the VGA board 150 when the power is turned off to the computer main body 100 or the input signal of the input device 10 is checked as a result of the power saving mode, , The VGA board 150 can not generate the digital interface signal DVI5V normally (high signal). That is, it generates an electrically low signal (0 V). Here, the VGA board 150 normally transmits the digital interface signal to the monitor 200 using the pin # 9. The low level digital interface signal thus generated is transmitted to the monitor 200 and transmitted to the DC voltage intercepting unit 230 through the video connector 220 of the monitor 200. Here, the video connector 220 transmits the input low-level digital interface signal to the DC voltage intercepting unit 230 using the pin 14. When the digital interface method is the HDMI interface method, the video connector 220 outputs the digital interface signal using the pin 18.

As shown in FIG. 2, the DC voltage interrupter 230 has the base of the switching element Q1 in a low potential state due to the low-level digital interface signal, and the switching element Q1 is turned off. When the switching element Q1 is turned off, the potential of the gate of the P-type MOSFET 231 connected to the collector increases to turn off the MOSFET 231. When the MOSFET 231 is turned off, the monitor operation power source DC12V output from the switching mode power supply 210 connected to the source of the MOSFET 231 can not flow to the drain, and the monitor operation power is supplied to the monitor control board 24 Thereby blocking the supply. Thereby, the monitor 200 is turned off.

In this case, only the monitor screen has been turned off in the prior art, but the second conventional technique originally blocks the power (monitor operation power) supplied to the monitor control board, thereby preventing power waste.

That is, since the VGA signal is not generated in the non-use state of the computer main body 100, a low-level digital interface signal is transmitted to the monitor 200, and the monitor 200 uses the VGA signal of the low level, Monitor operation power generated by the power supply is blocked from being supplied to the monitor control board.

When the computer main body 100 is returned to the normal state in the state where the power as the monitor driving power is shut off as described above, the VGA board 150 is controlled by the control of the central processing unit 120 Generates a high-level digital interface signal and transmits it to the monitor 200. The monitor 200 supplies the monitor driving power source DC12V generated by the switching mode power supply 210 to the monitor control board 240 using the transmitted high level digital interface signal, To operate normally again.

As described above, according to the second conventional technique, the VGA signal (digital interface signal) generated in the monitor 200 from the computer main body 100 is used as it is and the power (monitor operation power) of the monitor is automatically supplied Or blocking it, thereby providing the user with great convenience. In particular, it is possible to control the standby power of the monitor by using only the VGA signal between the main body of the computer and the monitor, without constructing a separate control device for power control of the monitor, It will be possible.

However, the second conventional technique also requires a power consumption for sensing operation of the monitor in order to check the power state of the PC. Specifically, the power mode is classified into 'power ON mode', 'power saving mode (DPMS) Power off mode ". In the power saving mode, about 1.4 W is consumed for the operation of the DC voltage cutoff unit 230 for detecting and checking the power off mode.

The power is supplied to the operation circuit such as the direct current voltage cutoff unit 230 and the like only for the state in which the screen is turned off but can be turned on immediately.

In conventional CRT monitors, such a technique is required because of the long display time, but in recent years, since the monitor is activated immediately when the power is turned on, the power saving mode is almost unnecessary, but the energy is still wasted .

Furthermore, in the conventional technology, existing monitors have been provided with power supply, voltage drop or power saving function by various control and control devices such as dimming control and power control for energy saving. This is because the circuit is complicated and the implementation price is high because the status of the power supply is checked by checking various signals other than a single signal. In addition, most of the techniques to passively change the signal coming from the PC, there is a limit to energy saving efficiency.

Korean Patent Laid-Open Publication No. 2013-0109060 (standby power cutoff device for computer and computer peripheral devices) Korean Patent Laid-Open Publication No. 2015-0123435 (monitor standby power cutoff device through computer linkage)

The present invention is to provide a control method of a power saving display capable of increasing power saving efficiency by searching for a monitor screen by itself and determining whether to enter a power saving mode by itself in a simple and simple manner.

In addition, when the + 19V power supply to the inverter is turned on / off in a simple manner by the clock signal (SCL signal) in the video input signal and the monitor screen itself is searched for and the power saving mode is to be entered by itself, The present invention is intended to provide a control method of a power saving display that reduces the power consumption of a display without changing any additional configuration by a simple operation of controlling an enable terminal signal by a microcomputer.

According to an aspect of the present invention, there is provided a method of controlling a power saving display having a self-diagnosis function of a monitor screen, the method comprising: providing an SMPS (20) for supplying power to a display; An inverter 70 for inverting a voltage from the SMPS and supplying the inverted voltage to the LED panel 80, a display controller 30 for controlling the operation of the display, a video input signal from the main board to the monitor controller A connector 40, a key control unit 90 including buttons for setting the operation of the display, a microcomputer 50 for directly controlling switching of the first operation power supplied from the SMPS 20 to the inverter 70, And a switching element (51) for directly switching the first operation power source supplied from the SMPS (20) to the inverter (70) A control method of a power saving display having a self-diagnosis function of a monitor screen of a control device of a display, wherein the SMPS (20) comprises a first operation power source And a second operation power supply having a relatively low voltage than the first operation power supply to the monitor control unit 30. The display control unit 30 controls the operation of the firmware 38, An MCU 31 for performing a control operation to a power saving mode through self-analysis of the monitor screen while performing interfacing with the memory 39, the power manager 36 and the key control unit 90, And a control unit for controlling the inverter (70) and the LED panel (80) while interfacing with the inverter (70) and the LED panel (80) And a display processing engine (32) for providing an inverter on / off control signal together with the firmware (38) and the microcomputer (50) and for generating an inverter power supply and a control signal, wherein the microcomputer 50) receives a third operation power having the first operation power supplied by the voltage regulator (60) lowered to a low voltage, and the microcomputer (50) (SCL) of a video input signal (monitor signal) transmitted from the board, and when it is recognized as a sleep mode, it issues a control signal for turning off the switching device 51, (Ii) the monitor control section 30 executes the monitor screen search subroutine even if the sleep mode is not selected, thereby turning off the first operation power supply to the inverter The microcomputer 50 sends a control signal to the microcomputer 50 so as to switch to the power saving mode in which the microcomputer 50 turns off the first operation power to the inverter (M) After the monitor control unit 30 receives a monitor screen search request from the microcomputer 50, the monitor screen search subroutine searches for a monitor screen by itself, captures one frame image, (S70) of initializing the second repetition number checking parameter (N); (n) after step (m), performing a screen change rate analysis of the monitor screen to determine whether there is a screen change (S71); (p) If it is determined in step (n) that there is no screen change, the step (n) is continuously executed. If there is a screen change, the change content is stored and compared with the 'A' A step (S72) of incrementing the number-of-repetition checking parameter (N); (q) after step (p), q1) the screen change is x% or more, or q2) the screen change is y frames or more per second, or q3) the screen change is z times or more in the horizontal direction (S73 to S75); (r) if it is determined in the step (q) that q1) to q3), the process returns to step (m) and is performed again from the beginning, and any one of the q1) to q3) If not, a step S76 of checking whether there is a repetition in the screen change; (s), if the screen change is not repeated as a result of the determination in the step (r), the process returns to step (n), and if the screen change is repeated, Whether or not it is N (No) is checked (S77); (n) returns to the step (n) if the parameter N for the second iteration number check is equal to or less than a predetermined reference value (N? No) as a result of the determination in the step (s) (N > No), the process proceeds to the next step; (W) As a final step, the monitor control unit 30 transmits a monitor search signal to the microcomputer 50 (SLEEP_CRTL = 'L') (S80), and terminates the monitor screen search subroutine. And a control unit.

Preferably, the microcomputer 50 determines whether wake-up occurs by checking the clock signal SCL after iii) entering the sleep mode of i) or the power-saving mode of ii) If the wake-up does not occur for a predetermined time or longer, the power converter of the SMPS 20 is controlled to be able to be deactivated, thereby shifting to a maximum power saving mode for further reducing standby power. Iv) Off "mode in which all functions of the monitor are stopped by turning off the operation of the monitor control unit 30 when the wake-up does not occur for more than a predetermined time.

According to another aspect of the present invention, there is provided a method of controlling a power saving display having a self-diagnosis function of a monitor screen, the method comprising: an SMPS (20) for supplying power to a display; An inverter 70 for inverting the voltage from the SMPS and supplying the inverted voltage to the LED panel 80, a display control unit 30 for controlling the operation of the display, a video input signal from the main board to the monitor control unit A key control unit 90 comprising buttons for setting the operation of the display and a microcomputer for directly controlling the switching of the first operation power supplied from the SMPS 20 to the inverter 70 And a switching device 51 for directly switching the first operation power supplied from the SMPS 20 to the inverter 70. The SMPS 20 is connected to the inverter 70 through the inverter 70, A first operation power source of a relatively high voltage used as a backlight power source of a display to be supplied and a second operation power source of a relatively low voltage relative to the first operation power source are supplied to the monitor control unit 30, The method comprising the steps of: (a) controlling a power source of the display device, the method comprising the steps of: (a) The microcomputer 50 checks whether the clock signal SCL of the video input signal (monitor signal) transmitted from the main board through the connector 40 is 'L' (S62); (b) If the clock signal SCL is 'L' as a result of the determination in the step (a), the controller 50 proceeds to the next step to generate a signal for controlling the switching element 51 to turn off, (S63) of cutting off the supply of the first operating power source to the power source (70); (c) after the step (b), waiting for a predetermined time (S64) and checking whether or not the wakeup is performed (S65); (d) If it is determined in step (c) that wake-up has occurred, a signal for controlling the switching element 51 to be turned on may be supplied to the inverter 70 so as to supply the first operating power to the inverter 70 (S63a), returning to step (a); (j) If the clock signal SCL is 'H' as a result of the determination in the step (a), the monitor control unit 30 searches the monitor screen to check whether the user intentionally uses the computer Requesting the monitor control unit 30 to execute the monitor screen search subroutine (S62a); And (k) the monitor control unit 30 waits for a predetermined time to execute the monitor screen search subroutine itself, and then checks whether or not the monitor search signal is received (S62b) The microcomputer 50 proceeds to step (b) to execute the standby power saving mode. If the monitor search signal is not received even after waiting for a predetermined time, The microcomputer 50 returns to step (a) and restarts from the beginning; (M) The monitor control unit 30 receives a monitor screen search request from the microcomputer 50 in step (j), and then searches for a monitor screen by itself (S70) of capturing a 1-frame image, storing it as 'A', and initializing a parameter N for checking a second iteration number; (n) after step (m), performing a screen change rate analysis of the monitor screen to determine whether there is a screen change (S71); (p) If it is determined in step (n) that there is no screen change, the step (n) is continuously executed. If there is a screen change, the change content is stored and compared with the 'A' A step (S72) of incrementing the number-of-repetition checking parameter (N); (q) after step (p), q1) the screen change is x% or more, or q2) the screen change is y frames or more per second, or q3) the screen change is z times or more in the horizontal direction (S73 to S75); (r) if it is determined in the step (q) that q1) to q3), the process returns to step (m) and is performed again from the beginning, and any one of the q1) to q3) If not, a step S76 of checking whether there is a repetition in the screen change; (s), if the screen change is not repeated as a result of the determination in the step (r), the process returns to step (n), and if the screen change is repeated, Whether or not it is N (No) is checked (S77); (n) returns to the step (n) if the parameter N for the second iteration number check is equal to or less than a predetermined reference value (N? No) as a result of the determination in the step (s) (N > No), the process proceeds to the next step; (W) As a final step, the monitor control unit 30 transmits a monitor search signal to the microcomputer 50 (SLEEP_CRTL = 'L') (S80), and terminates the monitor screen search subroutine. And a control unit.

Preferably, if it is determined in step (c) that wake-up does not occur even after waiting for a predetermined period of time as a result of the determination in step (c), a control signal for deactivating the power converter of the SMPS is issued Turning off the second operation power source (DC_5V), which is the monitor main power, and shifting to the maximum power saving mode for further reducing standby power; (f) after the step (e), waiting for a predetermined time again (S67), and again checking whether or not to wake up (S68); And (g) if it is determined in step (f) that wake-up has occurred, the power converter of the SMPS 20 generates a control signal for activating the power converter of the SMPS again And the second driving voltage is supplied to the monitor control unit to activate the monitor, and returning to step (d); And further comprising:

More preferably, (h) if it is determined in step (f) that wake-up does not occur even after waiting for a predetermined time, a final control signal for turning off the operation of the MCU is turned off (S69 ), Causing power to all elements of the monitor control unit including the MCU to be cut off; And further comprising:

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Most preferably, in the step (j), the monitor screen searching subroutine initializes the first repetition number checking parameter K, and (u) after the step (t) A step (S78) of incrementing a first repetition number checking parameter (K); And (v) after the step (u), it is checked whether the first repetition number checking parameter K exceeds a predetermined reference value (K> Ko) (S79), and the first repetition number checking parameter K ) Is less than a predetermined reference value (K < Ko), the process returns to step (m), and if the first checking parameter K is above a predetermined reference value (K> Ko), proceeding to the next step; Wherein the step (w) is performed after the step (v).

According to the control method of the power saving display having the self-diagnosis function of the monitor screen according to the present invention, it is possible to increase the power saving efficiency by searching the monitor screen by itself and determining whether to enter the power saving mode by itself in a simple and simple manner .

Furthermore, when the clock signal (SCL signal) in the video input signal is used to turn on and off the + 19V power supply to the inverter in a simple manner, and the monitor screen itself must be searched for itself to enter the power saving mode, the SMPS power converter An optimal monitor energy saving effect can be obtained by a simple operation of controlling the electronic terminal signal by the microcomputer.

As a result, the present invention proposes largely three energy saving modes for power saving of the monitor, and (1) the + 19V to the inverter in a simple manner by the clock signal (SCL signal) in the video input signal from the main board of the PC (2) cost saving and energy saving can be achieved by minimizing the number of devices added by the switching device, the voltage regulator and the microcomputer controlling them in the power saving structure, and (3) the monitor itself enters the power saving mode .

Other objects and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a standby power interruption device of a computer and a peripheral device according to a first prior art; FIG.
FIG. 2 is a block diagram of a monitor stand-by power cut-off device through a computer interlock according to a second conventional technique.
3 is a circuit diagram showing an embodiment of the video connector and the DC voltage cutoff portion of FIG.
4 is a block diagram of a controller and peripheral device of a power saving display having a monitor screen self-diagnosis function according to a preferred embodiment of the present invention;
5 is a detailed circuit diagram of the SMPS of FIG.
6 is a flowchart illustrating an operation of a microcomputer in a method of controlling a power-saving display according to a preferred embodiment of the present invention.
7 is a flowchart illustrating an operation of the monitor control unit of the control method of the power saving display according to the preferred embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a detailed circuit diagram of the SMPS of FIG. 4, and FIG. 6 is a detailed circuit diagram of a control apparatus and a peripheral device of a power saving display having a monitor screen self-diagnosis function according to a preferred embodiment of the present invention. 7 is a flowchart illustrating an operation of the monitor control unit of the control method of the power saving type display according to the preferred embodiment of the present invention.

(Optimum Embodiment of Control Apparatus for Power Saving Display According to the Present Invention)

First, a control apparatus of a power saving type display having a monitor screen self-diagnosis function according to a preferred embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG.

As shown in FIG. 4, the control apparatus of the power saving display having the monitor screen self-diagnosis function according to the preferred embodiment of the present invention includes an SMPS 20 for supplying power to the display, an LED panel An inverter 70 for inverting the voltage from the SMPS and supplying the inverted voltage to the LED panel 80, a monitor control unit 30 for controlling the operation of the monitor, and a video input signal (monitor signal) And a microcomputer 50 for directly controlling the switching of the first operation power supply DC_19V supplied from the SMPS to the inverter ).

At this time, the microcomputer 50 confirms whether it is in the sleep mode by the clock signal SCL of the video input signal (monitor signal) transmitted from the main board through the connector 40, , Turning off the first operation power supply (DC_19V) supplied from the SMPS to the inverter by issuing a control signal to turn off the switching element 51 through the 'SLEEP1' terminal, and ii) , The monitor control unit 30 searches the monitor screen and recognizes the monitor screen as being in a halt state. The monitor control unit 30 then issues a SLEEP_CRTL signal to the microcomputer 50 to cause the microcomputer 50 to transmit the first operation power (DC_19V) is turned off.

Furthermore, the microcomputer 50 also checks whether the wake-up occurs by checking the clock signal SCL continuously after turning off the first operation power supply DC_19V to the inverter, The enable terminal of the power converter 21 of the SMPS 20 is set to low through the SLEEP2 terminal and the SMPS 20 is switched from the SMPS 20 to the monitor control unit 30 Iv) Finally, after the supply of the second operation power DC_5V from the SMPS 20 to the monitor control section 30 is stopped for a predetermined period of time If no abnormal wake-up occurs, the MCU 31 of the monitor control unit 30 is turned off via the 'M_OFF' terminal, thereby stopping all functions of the monitor. For reference, the power converter 21 (for example, NB650) is a power converter having an enable signal terminal and capable of ON / OFF control.

4, the 'SCL' signal is a power state check signal of the PC as a signal of a synchronous clock line of the monitor signal. When the 'SCL' signal is input, the monitor ON operation is '0V' OFF operation. 'M_OFF' signals the MCU to turn off the monitor by giving a power off signal, 'SLEEP1' is the OFF signal of the first operation power (DC_19V) to the inverter, and 'SLEEP2' It is the OFF signal of the power source (DC_5V).

At this time, the microcomputer 50 is an operation power source, and the DC_19V power source is supplied with the operation voltage as the third standby power source which is reduced to +5 Vs by the voltage regulator 60.

That is, the most significant feature of the present invention is that even if an event from the outside is not input, the monitor control unit 30, particularly the MCU 31 itself, analyzes the monitor screen and determines that the user is not using the PC When the wake-up signal is not input within a predetermined time, the microcomputer 50 inactivates the power converter of the SMPS to turn on the second main power source of the monitor, It also cuts off the operating power and goes to hibernate mode itself, which deactivates all monitors.

On the other hand, in the sleep mode (there are two cases of transition to the sleep mode due to the detection of the SCL signal from the outside and a case where it is determined that the PC is not used by the user itself), the microcomputer 50 Firstly, only the first operation power source (DC_19V) is shut off, and if a wake up event is received within a predetermined time, all the operation power of the monitor is turned on.

That is, the 'SLEEP1' signal for shifting to the sleep mode is a state where only the first operation voltage DC_19V to the inverter 70 is blocked, and the 'SLEEP2' signal for transitioning to the maximum power- Only the minimum elements of the microcomputer and the monitor control unit 30 capable of checking the wakeup state from the main board are activated, and c) the 'M_OFF' signal for deactivating the entire monitor control unit is input to the key control unit 90), the same signal as the signal (for example, an off signal of about 50 ms) that the user presses the power-off button.

Next, the detailed circuit of the monitor control unit 30 will be described in detail with reference to FIG.

First, the MCU 31 performs interfacing between the firmware 38 and the flash memory 39, the power management 36, and the key control unit 90, The control operation to the power saving mode through the monitor screen self analysis in the present invention is performed.

Next, the dual interface engine 34 interfaces with the connector 40 such as the analog RGB connector 41, the DVI connector 42 and the HDMI connector 43, and the LVDS panel interface 35 is connected to the inverter 70, And the LED panel 80. The display processing engine 32 provides an inverter on / off control signal together with the firmware 38, the microcomputer 50, etc., and controls the inverter power and control Signal. Reference numeral 33 denotes an OSD, and reference numeral 37 denotes a clock generator.

The control signal SLEEP1 to the sleep mode is supplied to the monitor control unit 30 by the control signal SLEEP_CRTL applied to the microcomputer 50 or to the SCL signal of the monitor signal, The control signal SLEEP2 for the Hibernation mode is generated by the program of the microcomputer 50 and applied to the SMPS 20. An MCU off signal M_OFF is also generated by the program of the microcomputer 50, And is applied to the MCU 31.

Among the video input signals output to the connector 40 of the display by the CPU and the VGA on the desktop main board, the VGA signal VGA_SIGNAL is directly applied to the dual interface engine 34, but the VGA clock signal SCL Is also applied to the microcomputer 50 at the same time, so that the MCU is activated by inverting the MCU off signal M_OFF.

The second operation power supply DC_5V is supplied as the operating voltage VDD of the monitor control unit 30 and is also supplied to the firmware 38 and the audio amplifier 71 and the USB hub 72 at the same time.

(Optimum Embodiment of Control Method of Power Saving Display According to the Present Invention)

Now, the operation of the monitor control unit 30 and the microcomputer 50 will be described in more detail with reference to FIGS. 6 and 7. FIG.

First, when the monitor power is turned on (S60), the control method of the power saving display having the monitor screen self-diagnosis function of the present invention performs monitor booting (S61).

Thereafter, whether the VGA clock signal (SCL signal) of the main board is 'L' is checked through the 'SCL' terminal of the microcomputer 50 (S62). If the clock signal (SCL signal) is 'L' The supply of the first operation voltage DC_19V to the inverter 70 is cut off by issuing a signal to control the switching element 51 to turn OFF through the terminal SLEEP1 (S63).

Thereafter, after waiting for a predetermined time (S64), it is checked whether or not the wakeup is performed (S65). When it is determined that wakeup has occurred, a signal for controlling the switching element 51 to turn on is transmitted through the 'SLEEP1' terminal, The supply of the first operating voltage DC_19V to the inverter 70 is resumed (S63a), and the process proceeds to step S62 and repeats from the beginning.

However, if it is determined in step S65 that wake-up does not occur even after waiting for a predetermined time, a secondary power saving countermeasure is executed. Thus, the power converter 21 of the SMPS itself (S66), the second operation power source (DC_5V), which is the monitor main power, is also turned off, and the system goes to the maximum power saving mode in which all monitors are inactivated (of course, in this case, Unlike the step, a minimal power source (1.2V, for example) is provided to sense an MCU or other minimal device.

Thereafter, if it is determined that the wake-up has occurred, the control unit 10 determines whether or not the wake-up has occurred again after waiting for a certain period of time (S67) The power converter of the SMPS 20 is operated to supply the second driving voltage to the monitor control unit so that the monitor is activated and the switching device 51 is controlled to be turned on via the SLEEP1 terminal , The supply of the first operation voltage DC_19V to the inverter 70 is resumed (S63a), and the operation goes back to the step S62 to repeat the operation from the beginning.

However, if it is determined in step S68 that wake-up does not occur even after waiting for a predetermined period of time, a control signal to turn off the operation of the MCU through the 'M_OFF' terminal (S69) Button, the power is completely turned off, and the processor is terminated (in this case, unlike step S66, power to all devices including the MCU is cut off).

On the other hand, if it is determined in step S62 that the clock signal (SCL signal) is 'H' (not in the sleep mode), the monitor control unit 30 continuously scans the monitor screen according to the monitor signal It is determined that the SCL signal alone is not the sleep mode because the flash advertisement is input and the information is input from the VGA to the monitor even though the PC is not used because the user does not perform any operation. Accordingly, the monitor screen is searched by itself and the monitor control unit 30 is requested to check whether or not the user uses the computer. At this time, the parameter K for checking the number of repetitions is initialized to '1' (S62a).

Thus, after the monitor control unit 30 waits for a predetermined time for itself to search for the monitor screen, is the monitor search signal received? (S62b). When the monitor search signal is received from the monitor control unit 30, that is, when 'SLEEP_CRTL' = 'L', the microcomputer 50 stops the use of the computer even if no external event is input And proceeds to step S63 to execute the standby power saving mode in steps S63 to S69.

On the other hand, if the monitor search signal is not received after waiting for a predetermined time (that is, if 'SLEEP_CRTL' is not 'L'), the microcomputer 50 returns to step S62 and starts again from the beginning.

Now, the monitor control unit 30 searches the monitor screen itself and checks whether the user uses the computer (S70 to S79). This monitor screen search subroutine will be described in detail with reference to FIG.

First, as shown in FIG. 13, one frame image is captured and stored as 'A', and a parameter N for checking the number of repetition times similar to the parameter K is initialized to '1' (S70)

Then, the screen change rate analysis of the monitor screen is executed to determine whether there is a screen change (S71). If there is no screen change, ..., n) and then compared with 'A'. At this time, the parameter N is incremented (S72).

Then, is the screen change x% or more? (For example, 20% or more) (S73). If the screen change is x% or more (for example, 20% or more), the current user is using the computer. do. The main reason for checking is that, even if the user does not use the actual computer, a small pop-up window is opened on the browser screen in order to check the flash or the moving picture when the user connects the advertisement or the Internet.

If the screen change is not more than x% (for example, less than 20%) as a result of the determination in step S73, is the screen change at least y frames per second (for example, y = 10)? (S74). If the screen change is equal to or more than y frames per second (for example, more than 10 frames), it is determined that the moving image is being driven by the user, and the process returns to step S70 again . For reference, a moving picture that a user intentionally watches generally tends to change more than 30 frames per second, but in the case of a flash or a pop-up window advertisement, it tends to change at a rate of about 1 frame per 1 to 15 seconds. Therefore, it is generally preferable to use a reference of 3 to 20 frames per second (preferably 5 to 15 frames per second, and most preferably 10 frames per second).

As a result of the determination in step S74, if the screen change is less than 10 frames per second (when it is determined that the user does not intentionally execute the moving picture), the screen change is now z times (e.g., y = 15) is it? (S75). Thus, if it is z times or more (for example, if the feature of the screen change is 15 times in the horizontal direction), it is determined that the user is typing the character, and the process returns to step S70 again. That is, is the possibility that the user is typing a character, in the step S75, the degree of change of the entire screen is small and the screen change rate is low? And check whether it is.

On the other hand, if it is determined in step S75 that the screen change is less than z times in the horizontal direction, is there any repetition of the screen change? If the screen change is not repeated, the user may be using the computer. Therefore, the process returns to step S71 to check again. It is to see. For reference, the video content that the user intentionally watches continuously changes, but in the case of the flash or popup window advertisement, it tends to repeat and stop several times (about 5 times).

On the other hand, if it is determined in step S76 that the screen change is repeated, it is determined that there is a high possibility that the advertisement is a pop-up window advertisement or flash drive. However, since the current situation is likely to be a temporary and accidental situation, it is necessary to check 'No' in order to ensure certainty ('No' = 20 in the embodiment of FIG. 7) (S77). If N < No (if the number of checks is less than 20), the process returns to step S71 and checks again.

As a result of the determination in step S77, if it is determined that the user is not in use of the computer even though it is checked by repeatedly checking 'No' (there is not much screen change, slow speed change, The monitor control unit 30 transmits the monitor search signal to the microcomputer 50 (SLEEP_CRTL = 'L') (S80), and ends the monitor screen search subroutine.

If the process of S71 to S76 is performed once per second, it takes 20 seconds to repeat the processes of S71 to S76 for 20 times even if the repeat check is sufficiently performed by setting 'No = 20' It is possible that the user was temporarily resting for a while (about 20 seconds). In such a case, it may not be desirable to put the monitor into the power saving mode.

More preferably, even if the result of the determination in step S77 is 'Yes', after the predetermined time has elapsed, the parameter K for repetition number checking specified by the microcomputer in step S62a is incremented ( S78). It is more realistic to return to step S70 and repeat steps S70 to S78 Ko times.

In this case, after the parameter K for the number-of-repetitions check is incremented (several to several tens of seconds) after waiting for a predetermined time (S78), it is determined whether or not K> Ko (for example, (S79). If K < = Ko, the process returns to step S70 and repeats the steps from step S70 to steps S70 to S78. However, after performing steps S70 to S78 repeatedly Ko times, If so, the monitor control unit 30 transmits the monitor search signal to the microcomputer 50 (SLEEP_CRTL = 'L') (S80), and ends the monitor screen search subroutine.

For reference, Ko is at least 1, preferably 3? Ko? 15, more preferably 5? Ko? 10. If Ko = 3, except for the waiting time in step S78 in the above example, the time taken to execute this subroutine is about one minute, so even if No and Ko are set large enough, And the above various parameters may be set so that the user can freely set them.

For reference, in the case of a conventional monitor, power of several watts [W] to several tens of watts [W] is consumed at the time of display, and in the case of the conventional monitor control unit, 1.4 W is consumed in the sleep mode, Since the power is still connected to the SMPS for supplying power to the monitor even if the monitor power plug is not disconnected even in the 'turn off' state, the power consumption of about 0.3 W is consumed, , But this power consumption is almost negligible.

Therefore, according to the control method of the power saving display of the present invention, power of several watts [W] to several tens of watts [W] is consumed while the monitor is in use. In a conventional general display device, When a pop-up window advertisement or a flash video is played on the Internet, power of several watts [W] to several tens of watts [W] is consumed, but according to the present invention, it can be reduced to about 1.4 W, The power consumption of the conventional monitor is about 1.4 W. In the present invention, however, the power consumption of the conventional monitor is reduced to 0.3 W, which can save about 1.1 W per PC.

If the entire screen of the display is 1920 * 1080 = 2,073,600 pixels (about 2,000,000 pixels), it is determined that the entire screen is being used when a change occurs at about 400,000 pixels in step S73, Is less than 400,000 pixels, it is determined that the entire screen is not in use. In addition, VGA's color expressiveness initially had 16-color (4-bit color) / 256-color (8-bit color) performance, but later on to 65,536 colors (16 bits / high color) and 16,777,216 colors Was expanded. Here, 'n bits' means a capacity in a video memory occupied by one pixel. For example, in order to express 16 colors, 2 ⁴ = 16, so 4 bits per pixel. To express 256 colors, 2 ⁸ = 256, so 8 bits are required per pixel. Therefore, in the case of 32 bits which is commonly used today, theoretically it means that 2 ³² = 4,294,967,296 colors can be represented. Of course, we do not actually use 4 billion colors. The 16/256 color mode, which is the standard VGA color mode, has 2 ¹⁸ = 262, 256 colors to choose from 144 ready-made colors (called palettes). A palette space is created by assigning 6 bits (64 gray scales) to each of the three primary colors of red (R), green (G), and blue (B) Method. The same way EGA uses 16 colors in a 64-color palette space, the number of colors is increased here. Starting with the 16-bit high-color mode was an expression that specifies the even color codes in the pixel information without the use of pallets, to Reserve a graphics card, a little different from R / G / B per channel evenly 5-bit (32 gray level) per manufacturer ²¹⁵ = There is a way to use 32,768 colors (the remaining 1 bit is discarded) and there are ways to use 65,536 colors by assigning 6 bits to green, reflecting that the human eye is more sensitive to green changes. The 24-bit True Color mode uses 2 ²⁴ = 16,777,216 colors by assigning 8 bits per channel (256 tones), which is 32 bits per pixel for the most commonly used 32-bit color but 2 ³² = 4,294,967,296 colors It has the same color space as 24 bit, not use. The other 8 bits are attributed to the alpha channel (transparency). In fact, the colors that humans can distinguish are generally known as millions of colors, so they can be expressed in all 16.7 million colors. To increase the number, add information that allows you to specify the transparency of the pixels. Thus, only the pixel with the change is compared with the color code to measure the change amount.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

20: SMPS (for monitor) 21: Power converter
30: Monitor control section
31: MCU 32: Display processing engine
33: OSD 34: Dual Interface Engine
35: LVDS panel interface 36: Power management
37: Clock Generator 38: Firmware
39: Flash memory
40: connector 41: RGB connector
42: DVI connector machine 43: HDMI connector
50: Micom 51: Switching element
60: Voltage regulator
70: Inverter 71: Audio amplifier
72: USB hub
80: LED panel
90: Key control section

Claims (7)

An SMPS 20 that supplies power to the display, an LED panel 80 that operates as a backlight of the display screen, an inverter 70 that inverts the voltage from the SMPS and supplies the inverted voltage to the LED panel 80, A controller 40 for providing a video input signal from the main board to the monitor control unit, a key control unit 90 including buttons for setting the operation of the display, A microcomputer 50 for directly controlling the switching of the first operation power supplied to the inverter 70 and a switching element 51 for directly switching the first operation power supplied from the SMPS 20 to the inverter 70, A control method of a power saving display having a self-diagnosis function of a monitor screen of a control device of a power saving display having a self-diagnosis function of a monitor screen,
The SMPS 20 supplies a first operation power of a relatively high voltage used as a backlight power of a display supplied through the inverter 70 and a second operation power of a relatively low voltage as compared with the first operation power, (30)
The display control unit 30 performs the overall operation of the display control unit and performs the monitor screen self analysis while performing the interfacing with the firmware 38, the flash memory 39, the power manager 36 and the key control unit 90 A dual interface engine 34 for interfacing with the connector 40 and a controller 40 for interfacing with the inverter 70 and the LED panel 80, An LVDS panel interface 35 for controlling the inverter 70 and the LED panel 80 and an inverter on / off control signal with the firmware 38 and the microcomputer 50, And a display processing engine (32)
The microcomputer 50 receives the third operation power supplied from the voltage regulator 60 with the first operation power being lowered to a low voltage,
The microcomputer 50 checks whether a sleep mode is selected by the clock signal SCL of a video input signal (monitor signal) transmitted from the main board through the connector 40. If the microcomputer 50 recognizes the sleep mode, And turning off the first operation power supplied from the SMPS to the inverter by issuing a control signal for turning off the switching element 51. ii) The microcomputer 50 issues a control signal to the microcomputer 50 so as to cause the microcomputer 50 to turn off the first operation power to the inverter To the power-saving mode to be controlled,
The monitor screen search subroutine includes:
(m) After receiving the monitor screen search request from the microcomputer 50, the monitor control unit 30 searches for a monitor screen by itself, captures one frame image and stores it as 'A' (S70) of initializing a parameter N for the vehicle;
(n) after step (m), performing a screen change rate analysis of the monitor screen to determine whether there is a screen change (S71);
(p) If it is determined in step (n) that there is no screen change, the step (n) is continuously executed. If there is a screen change, the change content is stored and compared with the 'A' A step (S72) of incrementing the number-of-repetition checking parameter (N);
(q) after step (p), q1) the screen change is x% or more, or q2) the screen change is y frames or more per second, or q3) the screen change is z times or more in the horizontal direction (S73 to S75);
(r) if it is determined in the step (q) that q1) to q3), the process returns to step (m) and is performed again from the beginning, and any one of the q1) to q3) If not, a step S76 of checking whether there is a repetition in the screen change;
(s), if the screen change is not repeated as a result of the determination in the step (r), the process returns to step (n), and if the screen change is repeated, Whether or not it is N (No) is checked (S77);
(n) returns to the step (n) if the parameter N for the second iteration number check is equal to or less than a predetermined reference value (N? No) as a result of the determination in the step (s) (N > No), the process proceeds to the next step; And
(w) As a final step, the monitor control unit 30 transmits a monitor search signal to the microcomputer 50 (SLEEP_CRTL = 'L') (S80), and terminates the monitor screen search subroutine.
The method of claim 1, wherein the display is a display device. The method according to claim 1,
I) the microcomputer 50 checks whether the wake-up occurs by checking the clock signal SCL after entering the sleep mode of i) or the power-saving mode of ii) The power converter of the SMPS 20 is controlled so as to be able to be deactivated, thereby shifting to the maximum power saving mode for further reducing the standby power, and iv) Off mode in which all the functions of the monitor are stopped by completely turning off the operation of the monitor control unit 30 when the monitor display unit 30 does not occur. Control method. An SMPS 20 that supplies power to the display, an LED panel 80 that operates as a backlight of the display screen, an inverter 70 that inverts the voltage from the SMPS and supplies the inverted voltage to the LED panel 80, A controller 40 for providing a video input signal from the main board to the monitor control unit, a key control unit 90 including buttons for setting the operation of the display, A microcomputer 50 for directly controlling the switching of the first operation power supplied to the inverter 70 and a switching element 51 for directly switching the first operation power supplied from the SMPS 20 to the inverter 70, Wherein the SMPS 20 has a relatively high voltage first operating power supply used as a backlight power supply of the display supplied through the inverter 70 and a second relatively low voltage operating power supply having a relatively low voltage And supplies the second operation power to the monitor controller 30. The microcomputer 50 receives the third operation power from the first operation power supplied by the voltage regulator 60 to the low voltage A control method of a control apparatus of a power saving display having a monitor screen self-diagnosis function,
(a) the microcomputer 50 checks whether the clock signal SCL of the video input signal (monitor signal) transmitted from the main board through the connector 40 is 'L'(S62);
(b) If the clock signal SCL is 'L' as a result of the determination in the step (a), the controller 50 proceeds to the next step to generate a signal for controlling the switching element 51 to turn off, (S63) of cutting off the supply of the first operating power source to the power source (70);
(c) after the step (b), waiting for a predetermined time (S64) and checking whether or not the wakeup is performed (S65);
(d) If it is determined in step (c) that wake-up has occurred, a signal for controlling the switching element 51 to be turned on may be supplied to the inverter 70 so as to supply the first operating power to the inverter 70 (S63a), returning to step (a);
(j) If the clock signal SCL is 'H' as a result of the determination in the step (a), the monitor control unit 30 searches the monitor screen to check whether the user intentionally uses the computer Requesting the monitor control unit 30 to execute the monitor screen search subroutine (S62a); And
(k) After the monitor control unit 30 waits for a predetermined time to execute the monitor screen search subroutine itself, the monitor control unit 30 checks whether the monitor search signal is received (S62b) The microcomputer 50 proceeds to step (b) to execute the standby power saving mode. If the monitor search signal is not received even after waiting for a predetermined time, The microcomputer 50 returns to step (a) and starts again from the beginning;
/ RTI >
The monitor screen search subroutine includes:
(m) After receiving the monitor screen search request from the microcomputer 50 at step (j), the monitor control unit 30 searches for a monitor screen by itself, captures one frame image and stores it as 'A' (S70) initializing a parameter N for checking the second iteration number;
(n) after step (m), performing a screen change rate analysis of the monitor screen to determine whether there is a screen change (S71);
(p) If it is determined in step (n) that there is no screen change, the step (n) is continuously executed. If there is a screen change, the change content is stored and compared with the 'A' A step (S72) of incrementing the number-of-repetition checking parameter (N);
(q) after step (p), q1) the screen change is x% or more, or q2) the screen change is y frames or more per second, or q3) the screen change is z times or more in the horizontal direction (S73 to S75);
(r) if it is determined in the step (q) that q1) to q3), the process returns to step (m) and is performed again from the beginning, and any one of the q1) to q3) If not, a step S76 of checking whether there is a repetition in the screen change;
(s), if the screen change is not repeated as a result of the determination in the step (r), the process returns to step (n), and if the screen change is repeated, Whether or not it is N (No) is checked (S77);
(n) returns to the step (n) if the parameter N for the second iteration number check is equal to or less than a predetermined reference value (N? No) as a result of the determination in the step (s) (N > No), the process proceeds to the next step; And
(w) As a final step, the monitor control unit 30 transmits a monitor search signal to the microcomputer 50 (SLEEP_CRTL = 'L') (S80), and terminates the monitor screen search subroutine.
The method of claim 1, wherein the display is a display device. The method of claim 3,
If it is determined in step (c) that the wake-up does not occur even after waiting for a predetermined time, a control signal for inactivating the power converter of the SMPS is issued (S66) Turning off the second operation power source and shifting to a hibernation mode for further reducing standby power;
(f) after the step (e), waiting for a predetermined time again (S67), and again checking whether or not to wake up (S68); And
(g) If it is determined in step (f) that wake-up has occurred, the SMPS 20 is activated by issuing a control signal for activating the power converter of the SMPS again (S66a) A voltage is supplied to the monitor control unit to activate the monitor, and returning to step (d);
Further comprising the step of controlling the display of the monitor screen. 5. The method of claim 4,
(h) If it is determined in step (f) that wake-up does not occur even after waiting for a predetermined time, a final control signal for turning off the operation of the MCU (S69) Causing power to all elements of the monitor control unit to be cut off;
Further comprising the step of controlling the display of the monitor screen. delete The method of claim 3,
In the step (j), a first parameter K for checking the number of repetitions is initialized,
The monitor screen search subroutine includes:
(u) incrementing the first repetition number checking parameter (K) after waiting for a predetermined time after the (t) step (S78); And
(v) After the step (u), it is checked whether the first repetition number checking parameter K exceeds a predetermined reference value (K> Ko) (S79) (K ≦ Ko), the process returns to step (m), and if the first checking parameter K is greater than a predetermined reference value (K> Ko), proceeding to the next step;
Further comprising:
Wherein the step (w) is performed after the step (v).

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