KR101816249B1 - A method for controling a display having the power saving function by revising the brightness of a monitor - Google Patents

Abstract

The present invention relates to an apparatus for controlling a power-saving display through adjustment of monitor brightness and a method thereof for a substantial power saving effect of a monitor. According to the present invention, the apparatus for the power-saving display includes: an SMPS (20); an inverter (70) configured to invert the voltage from the SMPS and supply the inverted voltage to an LED panel which operates as a backlight of a display screen; a monitor controller (30) configured to control operations of a monitor; a receiver connector (40) configured to provide a video input signal from a main board (10) to the monitor controller; and a key controller (90) configured to include buttons for setting the operations of the monitor. The monitor controller (30) includes: an MCU (30) configured to operate as a general controller; a display controller (30); an LVDS panel interface (35); and firmware (38). According to the present invention, the original pixel data is inputted in the MCU (31) from the display controller (30), and then the pixel data corrected by a first mixer (31a) is outputted to the inverter (70). The brightness information on the LED panel is inputted in the MCU (30) from the LVDS panel interface (35), and then the brightness information modulated by a second mixer (31b) is outputted to the inverter (70).

Description

[0001] The present invention relates to a method of controlling a power saving display using a monitor brightness correction method,

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 power saving efficiency by correcting brightness of a monitor.

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 interruption device) includes a power switching unit at a front end when a power is supplied to a computer, and the standby power is shut off by turning off power to the computer as well as the computer when the computer 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.

On the other hand, in general, a liquid crystal display (LCD) uses a change in the transmittance of liquid crystal depending on an applied voltage to convert various electrical information generated in various devices into image information, And a backlight unit for supplying light to the light source.

4A is a cross-sectional view showing an example of a conventional direct-type liquid crystal display device of the related art. Referring to the drawings, a conventional LCD (Liquid Crystal Display) includes a liquid crystal panel 20 containing a liquid crystal pixel 23 serving as a light valve by controlling the transmittance of light, And a backlight unit (10).

The backlight unit 10 includes a CCFL (Cold Cathode Fluorescence Lamp) 11a, an EEFL (External Electrode Fluorescence Lamp), a white light LED (Light Emitting Diode), or an LED emitting three colors of R, G, A light source assembly 11 and light sheets for reflecting light from the light source on a reflector 11b located below the light source or mixing the light uniformly to a plurality of liquid crystal pixels 23. Here, R, G, and B are abbreviations of Red, Green, and Blue, respectively, and R, G, and B indicate red, green, and blue, respectively,

The light sheet is basically composed of a diffusion plate 12, a diffusion sheet 13, a light condensing sheet 14, a reflection type polarizing sheet 15 and a protective film 16 so as to adjust the viewing angle and brightness appropriately do.

Meanwhile, FIG. 4B shows a conventional liquid crystal display employing a conventional side-type backlight unit. In the case of the side-type backlight unit, the optical waveguide 17 and the light source of the CCFL or the LED 11-1 disposed on the side of the optical waveguide 17 are included. A diffusion sheet 13, a light condensing sheet 14, a reflection type polarizing sheet 15 and a protective film 16 are disposed between the optical waveguide 17 and the liquid crystal panel 20, A scattering pattern 18 and a reflection film 19 are provided on the lower surface of the waveguide 17 to improve uniformity of light and luminance.

4 and 5, the liquid crystal panel 20 is installed between the rear glass substrate 22, the front glass substrate 25, the rear glass substrate 22, and the front glass substrate 25 A plurality of liquid crystal pixels 23, R, G and B color filters 24 provided inside the front glass substrate 25, a polarizing sheet A 21 attached to the rear glass substrate 22, The polarizing sheet B 26 and the like attached to the light guide plate 25 play a major optical role. Each of the liquid crystal pixels 23 is composed of R, G, and B liquid crystal subpixels that implement images of R, G, and B colors, and R, G, and B liquid crystal subpixels, R, G, B color filters 24 (24a, 24b, 24c) for transmitting B light are provided.

In addition, a black matrix (24d) is provided at the boundary line between adjacent color filters (24) to eliminate color crosstalk between neighboring sub-pixels.

In order to implement a color image in the conventional LCD, R, G, and B liquid crystal subpixels for implementing R, G, and B three-color images are provided in one liquid crystal pixel serving as a minimum unit of a pixel, R, G, and B color filters are provided on the front side of the liquid crystal subpixel of the liquid crystal panel, and the backlight unit sprays uniform white light over the liquid crystal panel. The white light passes only R, G, and B light for each subpixel Color images are made.

In the conventional LCD, the power of white light emitted from the backlight unit 10 is adjusted to the aperture ratios of the polarizing sheets 21 and 26, the color filter 24, and the liquid crystal pixel 23 provided before and after the liquid crystal pixel 23 And the light energy efficiency of the LCD is considerably low because only about 5% to 10% of light is emitted from the LCD. Therefore, improvement of light energy efficiency of LCD is an important task for strengthening competitiveness of LCD and saving energy. The light energy loss of the LCD is about 50% at the polarizing sheets 21 and 26, about 30% to 50% at the aperture ratio of the liquid crystal pixel 23 and about 70% at the color filter 24, Resulting in high power consumption of the LCD. Particularly, although the color filter 24 is a key element for realizing a color image, there is a problem that it causes a lot of light loss due to absorption.

The color filter 24 is a key element for realizing a color image. However, since about 30% of the white light passes through the color filter 24 and about 70% of the white light is absorbed and lost, It is the largest portion of loss.

Thus, in order to solve such a problem, a technique such as Korean Patent Laid-Open No. 10-2012-0108479 (backlight unit) (third prior art) has been proposed.

Hereinafter, the backlight unit according to the third related art will be described with reference to FIGS. 6A to 7.

The liquid crystal display device to which the backlight unit 300 according to the third prior art is applied includes a three-color light source 310, an optical waveguide array 100, and a first lenticular lens array sheet 400.

The backlight unit 300 is disposed at a lower portion of the liquid crystal panel 200 including a plurality of liquid crystal subpixels 210 corresponding to the three color light sources 310, To the liquid crystal panel (200).

Here, the light of the three colors usually means red (R), green (G), and blue (B) for realizing a color image. However, since cyan, magenta, and yellow can be implemented in color images, the three colors of light may be cyan, magenta, and yellow. Hereinafter, for convenience of explanation, the case where the three colors of light are red (R), green (G), and blue (B) will be described as an example, and the same is applied throughout this specification.

The liquid crystal panel 200 disposed on the upper portion of the backlight unit 300 includes a plurality of liquid crystal subpixels 210 (210R, 210G, 210G) corresponding to three colors of red (R), green 210B, polarizing films 240, 250, and a diffusion sheet 260.

The backlight unit 300 disposed at a lower portion of the liquid crystal panel 200 includes a plurality of three colors (red, green, and blue) for emitting red, green, And includes light sources 310 (310R, 310G, 310B). As the three-color light source 310, a light emitting diode (LED) that emits red, green, and blue light may be used, or a white light emitted from a white LED may be used by using a spectroscopic device such as a diffraction grating It can be obtained by decomposing into spectral light of red, green, and blue. Alternatively, the three-color light source 310 may use an organic light emitting diode (OLED) or a quantum dot.

The optical waveguide array 100 includes a plurality of optical waveguides 110 (110R, 110G, and 110B) arranged in parallel with each other. The optical waveguides 110R, 110G and 110B are provided corresponding to a plurality of R, G and B liquid crystal subpixels 210 provided in the liquid crystal panel 200, (R, G, B) of the three colors toward the liquid crystal subpixel 210 corresponding to each color.

A first lenticular lens array sheet 400 is disposed between an upper portion of the optical waveguide array 100 and the liquid crystal panel 200. The first lenticular lens array sheet 400 is disposed between the three- And converts the irradiated three-color light (R, G, B) into parallel light.

Alternatively, as shown in FIG. 7, a three-color spontaneous light source array 150 and a backlight unit 300 including the first lenticular lens array sheet 400 may be used. Further, the reflective polarizing film 800 and the second lenticular lens array sheet 900 can be selectively provided.

The liquid crystal panel 200 installed on the backlight unit 300 includes a plurality of liquid crystal subpixels 210R, 210G, and 210B corresponding to three colors of light (R, G, and B) do.

The backlight unit 300 includes a plurality of tricolor spontaneous light sources 150 (150R, 150G, 150B) disposed below the liquid crystal panel 200 and emitting three colors of light (R, G, B) do. As the tricolor spontaneous light source 150, red, green and blue organic light emitting diodes (OLED) 150 or red, green and blue quantum dots may be used.

The quantum dot spontaneous light source may be a semiconductor crystal having a diameter of about 10 nanometers (eg, CdS, CdSe, ZnS, etc.), and may be coated with a polymer on the outer layer. Depending on the diameter of the semiconductor crystal, a wavelength of red, green, It can be used as a three-color spontaneous light source together with an OLED.

The three color spontaneous light source arrays 150 150R, 150G and 150B are installed at the same intervals as the plurality of liquid crystal subpixels 210R, 210G and 210B, And is provided on the upper surface of the rear plate 700.

The first lenticular lens array sheet 400 includes a reflective light shielding layer 410, a slit 420, a transparent substrate 430 and a lenticular lens array 440. The reflective shielding layer 410 It is possible to prevent color interference between neighboring pixels. When the light-shielding wall 450 is added between the lenticular lenses 440, the color crosstalk is substantially eliminated and the color filter can be removed. The reflective light shielding layer 410 may be disposed between the first lenticular lens array sheet 400 and the tricolor spontaneous light source array 150 as a separate slit sheet 480, As shown in FIG.

In this case, the R, G, and B color filters 920 installed inside the liquid crystal panel 200 may be removed, but they may be left as they are to minimize the stability of the screen and color interference. That is, the color filter 920 is not necessarily provided but may be optionally provided.

The second lenticular lens array sheet 900 for further improving the efficiency by condensing the three colors of light (R, G, B) into the liquid crystal subpixels 210 (210R, 210G, 210B) and the color filter 920 ) Can be selectively installed.

Thus, according to the third conventional technique, the light waveguides corresponding to the three color light sources of red, green, and blue are used to emit red, green, and blue light directly to the liquid crystal subpixels respectively corresponding to red, Further, it is possible to improve the light transmission efficiency of a liquid crystal display device through a backlight unit that sprays, and moreover, a spontaneous light source such as R, G, and B OLEDs or R, G, and B quantum dots When it is used, the structure of the light source is further simplified, and both the advantages of the liquid crystal display device and the advantages of the spontaneous light source are achieved, thereby achieving high efficiency and image quality.

However, still in the case of the third prior art, it is impossible to completely avoid the problem that most of the backlight light source is shut off, and only a part thereof is used for color formation of the display.

In order to solve the problems of the third prior art, a technique (fourth conventional technique) such as Patent Publication No. 10-2008-0081511 (power control method, apparatus and display device based on the histogram of the input image) The technique of Patent Document 10-2006-0120673 (method and apparatus for image optimization of a backlit display) (fifth prior art) has been proposed.

The fourth conventional technique is to complementarily control the luminance of the output video signal and the luminance of the backlight based on the luminance distribution of the input video signal, thereby minimizing the luminance degradation of the displayed output video signal, A device, and a display device having such a function.

That is, the conventional display device operates in the maximum power saving mode and the minimum power saving mode, and the maximum / minimum power saving mode reduces the brightness of the backlight regardless of the input video signal, and the brightness decreased according to the selection of the power saving mode However, the conventional power saving method according to the related art applies a predetermined luminance reduction value selected by the user to all the input video signals at a time, so that the output video is entirely darkened. In particular, A distortion phenomenon to be lost occurs. Therefore, there is a desperate need for a technique for reducing the power consumption of the display device without affecting the luminance of the output video signal.

8 and 9, FIG. 8 is a block diagram conceptually showing a power control apparatus 100 of a display device according to the fourth conventional technique, and FIG. 9 Is a flowchart conceptually showing a power control method of the display device according to the fourth prior art.

8 is a block diagram of a power control apparatus 100 according to a fourth embodiment of the present invention. The apparatus 100 includes a histogram analyzer 110, an image brightness compensator 130, a hue compensator 150, and a backlight brightness controller 170. .

When the input video signal is received, the histogram analyzer 110 calculates the brightness distribution of the input video signal and determines the clipping gradation (IC) using the calculated brightness distribution. When the clipping gradation (IC) is determined, the image brightness compensator 130 calculates the gradation increase rate using the determined clipping gradation (IC), and applies the result to each color component of the input image signal.

The hue compensating unit 150 re-adjusts the gradation of the color component in which saturation occurs among the respective color components of the video signal whose gradation has been increased in accordance with the gradation increase rate. In addition, the backlight luminance controller 170 generates a backlight luminance adjustment signal using a clipping gradation (IC) to adjust the brightness of the backlight. When the power control apparatus 100 shown in Fig. 8 is used, the user can hardly feel the change in brightness while reducing the power consumption of the display apparatus. The reason for this is that since the backlight luminance controller 170 reduces the brightness of the backlight in consideration of the brightness distribution of the input video signal to reduce the power, the video brightness compensator 130 increases the luminance of the input video signal to be.

More specifically, the histogram analyzer 110 determines the clipping gradation (IC) using the brightness distribution of the input video signal. The clipping gradation (IC) is determined by a cumulative histogram of pixels or a cumulative distortion value of a pixel.

When the clipping gradation (IC) is determined, the image brightness compensator 130 receives the clipping gradation (IC) from the histogram analyzer 110 and calculates the gradation increase rate using the received clipping gradation (IC). Further, the calculated gradation increase rate is applied to each color component of the input image signal to generate an output image signal with increased gradation.

The color components of the output image signal are compensated through the hue compensating unit 150.

The backlight luminance controller 170 generates a backlight luminance control signal for reducing the luminance of the backlight by using the clipping gradation (IC) output from the histogram analyzer 110. In order to control the luminance of the backlight, current and voltage can be used. In general, the luminance of the backlight can be controlled by using a voltage. However, the magnitude of the voltage applied to the backlight and the luminance of the backlight are not changed linearly. Therefore, the backlight luminance adjustment signal corresponding to the decrease value of the backlight luminance corresponding to the received clipping gradation (IC) can be determined experimentally. In this case, the relationship between the value of the received clipping gradation (IC) and the output backlight luminance adjustment signal can be stored in the form of a look-up table. In the fourth conventional art, it is experimentally found that when the consumption current is reduced by 30% as the luminance of the backlight is reduced, the amount of power consumed can be reduced by as much as 50%.

Next, a power control method of the display device according to the fourth prior art will be described with reference to FIG.

First, when an input video signal is received (S610), a histogram of the received video signal is analyzed, and a predetermined clipping gradation is determined based on the analyzed histogram (S620). As described above, the clipping gradation (IC) can be determined using the luminance distribution corresponding to the upper several percent of the input image signal or can be determined using the cumulative luminance error.

When the clipping gradation (IC) is determined, the gradation increase rate of the input image signal is calculated. In operation S630, an output image signal having an increased gray level is generated by multiplying each color component using the calculated gray level increase rate. In this case, it is determined whether saturation has occurred in the color component (S640). If saturation occurs, the color component is compensated (S650). In order to compensate for the color components, it is possible to calculate a new gradation increase rate by weighting the maximum and minimum increase rates, or to quantize the quantization noise as described above.

If saturation does not occur in the color components, that is, if the luminance of the input image signal is originally low and saturation does not occur even if the color components are increased, the luminance of the backlight is decreased based on the gradation increase rate (S660). It is as described above that a predetermined look-up table can be used to reduce the brightness of the backlight.

Since the luminance of the input image signal is increased and the luminance of the backlight is decreased, the histogram of the final output image signal is almost similar to the histogram of the input image signal.

That is, according to the fourth conventional technique, the brightness of the video signal is adaptively increased in accordance with the histogram of the input video signal, and at the same time, the brightness of the backlight is decreased in inverse proportion to the increase of the video signal, The power consumption of the display device can be reduced.

Meanwhile, in order to solve the general problem that the brightness and the clarity of the backlight are reduced by reducing the level of the backlight in order to improve the battery life and the bright backlight conspicuously consumes power in most electronic devices, And a method and apparatus for use in optimizing an image that can be observed on a color LCD when the backlight is adjusted.

10, a simplified display device 200 for use in an electronic device is disclosed, the display device 200 comprising a display 208 for providing a visual image, A processor 212 for determining the intensity of the backlight 216 to illuminate the display 208 and a display 212 coupled to the display 208 and the processor 212 to optimize the visual image in accordance with the intensity of the backlight 216. [ Lt; RTI ID = 0.0 > 202 < / RTI >

The controller 202 has an input 204 and an output 206. The output 206 may be a neutralized connection set for driving the multi-display 208. The display 208 includes individual pixels 210 that mostly form an array of pixels. A processor 212 having an output 214 may be used to drive the backlight 216 illuminating the display 208. The processor 212 may be coupled to the controller via a connection 218 for communicating the level or intensity of the backlight 216 and for accessing pixel data. Depending on the physical configuration of the display device and the particular electronic device, one or more additional backlights 220 may be employed, and may also be driven by the processor 212. The processor and controller may be physically or logically located in one device 222 as shown. The level of backlight 216 may be selected by the user through some form of user interface or may be automatically adjusted by processor 228 based on other factors.

The characteristic of the LCD display 208 is that the screen is divided into small segments called pixels 210. Pixels 210 may vary in size depending on the resolution and type of configuration of the display. The hue, saturation, and brightness of each pixel 210 are largely determined by the setting of red, green, and blue ("RGB") sub-components for pixel 210. By adjusting the RGB setting for the pixel 210, not only the hue and saturation but also the contrast and brightness can be set. The visual image can be optimized by adjusting the red, blue, and green settings for each of the pixels 210 of the array.

In the above adjustments, maintaining a constant scaling between the red, green, and blue settings causes the intensity, brightness, brightness, or brightness of the pixel 210 to change without changing the hue and saturation of the pixel 210. This can be done by scaling the original settings to the same scaling factor or by increasing each brightness by the same percentage increase. Since the procedure, method, and apparatus for scaling the settings of red, green, and blue are the same for adjusting intensity, brightness, brightness, or brightness while maintaining hue and saturation, the term brightness refers to pixel brightness, Light intensity, or luminance.

By applying the characteristics of this LCD display 208, the brightness of the pixel 210 can be increased and the image can be optimized as the level of the backlight 216 decreases. In other words, the brightness of the pixel can be adjusted in inverse proportion to the intensity of the backlight 216, so that the visual image can be optimized. The integrity of the image is preserved by maintaining the hue and saturation of each pixel of the pixel array.

In an example where the pixel 210 may already have a relatively high brightness and the intensity of the backlight 216 is reduced, one or more of the red, blue, and green settings may require adjustment above the maximum setting. For illumination purposes, assume that the red, blue, and green settings for pixel 210 may range from 0 to 255. [ In this example, red is at 200, green is at 150, and blue is at 100, resulting in an intermediate brown hue. A 15% reduction in backlight 216 intensity (as measured by the current driving light, photosensor, or other mechanism), such as experimentally adjusted with maximum effect, may result in an increase in the brightness of the corresponding pixel 210, For example a 20% increase. A 20% increase results in new red, green, and blue intensities of 240, 180, and 120, respectively, resulting in brighter brown tones, and still provides higher brightness while still maintaining hue. However, when the backlight 216 intensity is reduced by 35%, the intensity of the pixel 210 will be adjusted, for example, by a corresponding 35%, resulting in the red value 270 exceeding the maximum value. In these examples, the red value is set to 255 so that a 27.5% increase rate of (255-200) / 200 can be set. The remaining green and blue values are each increased by 27.5% to provide a final setting (rounded to the total number) for 255, 191, and 128 pixels 210 in red, green, and blue, respectively. This is still a brown hue and has the highest available brightness while maintaining its hue. That is, the red, green, and blue settings are adjusted in proportion to the intensity of the backlight until the maximum setting exceeds the threshold value. Then, the setting is set to the maximum value, and a percentage increase of the setting is used to increase the remaining setting. The ability to calculate that a pixel has reached a threshold value at a given backlight level can be used to adjust the backlight level to specify a nearby or near brightness saturation to provide a blend of the overall color intensity and backlight level.

This ratio adjustment and the use of threshold values can also be applied to dark tones (low red, green, and blue settings) when the backlight intensity is increased. The corresponding reduction in hue or brightness will cause an effective reduction of any hue if all of the color components are equally reduced (black). In other words, the threshold value can be applied so that the contrast is lost and the brightness is not lowered to the point at which any provided image simply becomes black. In this case, a lower limit value, for example 50, may be set. When adjusting to a brighter backlight, when an arbitrary value is reduced to 50 or less, a value of 50 or less will be set to 50, and a percentage reduction of that setting will be used to decrease the value of the remaining setting.

10, when a backlight 216 level change occurs, the controller 202 may calculate a new value for the pixel 210 of the pixel array using any of several methods. In an exemplary embodiment, the controller can optimize the visual image by adjusting all pixels of the pixel array with a fixed value according to a look up table. As an example only used for illustrative purposes, it is illustrated that the pixel brightness is increased from 8% to 10%, while the look-up table reduces the backlight 216 level from greater than about 0% to about 15%. Reducing the backlight 216 from greater than about 15% to about 25% increases the pixel brightness by 18% to 20%. Any such adjustment can be made while maintaining the hue and saturation, taking into account the above-mentioned maximum value. Alternatively, each pixel 210 may calculate and adjust a new value for that pixel 210 in real time based on a change in intensity of the backlight 216, and may include or include compensation for a backlight display change as described above I will not. The pixel array can be divided into parts, and a new adjustment value for that part is calculated and applied to the pixels 210.

Referring to the operation of the fifth prior art, as shown in FIG. 11, the backlight intensity, or more suitably the backlight intensity variation, is first determined 300 and the brightness scale factor is calculated 302. That is, a factor for adjusting the image according to the backlight intensity is determined, so that a constant brightness scale factor can be determined for all the pixels 210 in the display. This can be empirically driven for a particular display configuration and a constant brightness scale factor can be determined for all pixels 210 according to a table of predetermined values that can benefit from accelerating the real time calculation of the scaling factor . A second lookup table of scale factors can also be computed and includes entries for each color component value from 0 to the maximum value. Alternatively, a change in backlight level in other areas of the screen may be accounted for. After the brightness scaling factor is determined, a second factor may be used to adjust the image of that portion of the display, based on the backlight intensity of a portion of the screen. This is particularly applicable to the situation where some areas of the screen are always brighter than other areas due to the optical properties or non-uniform distribution of light from the backlight. Brightness control according to both the change in backlight intensity and the change in observed intensity at a given location allows for perceived uniformity in the display viewing area.

An additional consideration in determining the brightness scaling factor is maintaining the hue and saturation of the image. In a display characterized by pixels 210 composed of primary colors of red, green and blue, proportional adjustment is made to each of the three components to maintain the hue and saturation of the displayed image.

A threshold value for a pixel component or a color component is determined (304). The threshold may be the one added by the display itself, i. E., The maximum brightness or brightness supported, or it may be an experimental limit, such as a low value determined to be necessary for color discrimination or for observed color saturation. For other areas of the screen, the threshold may be different. As described above, the screen can be divided into sections for ease of calculation or to simplify compensation of backlight variations.

The color component values are tested 308 to see if they exceed the color component threshold. When any one of the component or color component values exceeds a threshold value, when the size of one or more of the red, green, and blue components exceeds the threshold value, the setting that exceeds the limit by the greatest amount is the maximum value or May be set to another predetermined value (310). The setting for the remaining color component values is increased by the same percentage increase as the highest original color component value (312). It is desirable, but not required, to maintain the original hue and saturation of the pixel 210 when determining the brightness value, i. E., The size of the red, green, and blue pixel settings, in a marginal situation. Rigorous proportional control changes can be made for fast calculations, rounding errors, or table navigation matching.

A no branch of reference numeral 308 follows (314) when there is no setting exceeding a predetermined threshold, or when hue and saturation are not maintained, such as when maximum values are reached and proportionality is not maintained. New values of the red, green, and blue settings are applied to the image of the pixel 210 to adjust the image using the brightness scale factor. Reads the display values from the controller 202 and, in whole or in part, operates on the image and then rewrites the optimized data back to the controller 202. A test 318 is performed to determine if all pixels or sections of the display have been adjusted. If not, the process continues at 308.

When all the processing is completed, the example branch of reference numeral 318 is followed and the processing ends.

The new values of the magnitudes of the red, green, and blue components are calculated (306) in a relationship that is inversely proportional to the change in intensity of the display. On the other hand, if it is determined in step 308 that the threshold values are not checked, the processing continues with reference numeral 314.

In the fourth conventional art and the fifth conventional art, although the concept of adjusting the pixel value in accordance with the change in luminance is partially described, it is separated from the overall monitor power saving countermeasure in relation to the countermeasure for overall power saving of the monitor , There is a limit to practical application.

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) Korean Patent Publication No. 10-2012-0108479 (backlight unit) Korean Patent Laid-Open No. 10-2008-0081511 (Power Control Method and Apparatus and Display Apparatus of Display Device Based on Histogram of Input Image) Korean Patent Laid-Open No. 10-2006-0120673 (Method and Apparatus for Image Optimization of a Backlit Display)

The present invention is directed to a monitor power saving countermeasure as a countermeasure against the problems of the first and second related arts, and also to a countermeasure against the problems of the third to fifth prior arts, And to provide a control method of a power saving display through a possible monitor luminance correction.

Further, a control method of a power saving display capable of increasing the power saving efficiency by determining whether to enter the power saving mode by searching for only a part of the display scan line or not via the clock signal from the main board, or in a simple and simple manner .

That is, it is possible to obtain an optimal monitor energy saving effect by a simple operation of detecting the clock signal SCL in the video input signal. When the SCL signal is switched, the power saving of the monitor can be easily and easily performed without a separate control circuit, or the power can be similarly saved even when the power saving mode is entered through the monitor itself.

As a result, the present invention proposes three energy saving modes largely for power saving of a monitor, namely, (1) direct energy reduction through reduction of luminance in the representation of relatively dark color (in this case, (2) saving the energy by turning off the SCL signal when the PC does not input the signal, and (3) searching for a change in the monitor screen, thereby saving energy on the monitor itself.

According to an aspect of the present invention, there is provided a method of controlling a power saving display through brightness correction of a monitor, including: a SMPS (20) for supplying power to a display; An inverter 70 for inverting the voltage from the SMPS and supplying the inverted voltage to an LED panel that operates as a backlight of a display screen; A monitor control unit (30) for controlling the operation of the monitor; A receiving side connector 40 for providing a video input signal from the main board 10 to a monitor control unit; A key control unit 90 comprising buttons for setting the operation of the monitor; The monitor control unit 30 includes an MCU 31 for performing operations of the overall control unit and a display controller 30 for controlling whether power is supplied from the SMPS 20 while interfacing with the reception side connector 40 An inverter 70 and an LVDS panel interface 35 for controlling and controlling the interface with the LED panel and a firmware 38. The receiving connector (TMDS Rx) (TMDS Tx) 19 for interfacing with the graphic controller 18 of the main board 10 and the monitor signal and the clock signal SCL are received via the monitor cable and the original pixel data (Original PIXEL data) Is inputted from the display controller 30 'to the MCU 31 and then pixel data corrected through the first mixer 31a is outputted to the inverter 70, The luminance information (Brightness) The control of the power saving type display through the brightness correction of the monitor which is inputted to the MCU 31 from the interface 35 and then the brightness information modulated through the second mixer 31b is outputted to the inverter 70 (E ') the MCU (31) judges whether the user is continuously using the monitor or not; The MCU 31 performs control to turn off both the first and second switches 51 and 61 so that the SMPS 51 and the second switch 51 are turned off, (20), thereby turning off all the monitor power supplies except for the minimum standby power supply; (E ') comprises: (e1) initializing (S40) a repetition number parameter (N); (e2) capturing and storing the entire screen of the monitor (S41), capturing and saving the changed screen (S42); (e3) Monitor screen change is less than a certain percentage (x%)? (S44) of judging whether or not it is judged whether or not it is judged that the user is in the step (e4) If it is determined in step (e3) that the rate of change is less than a predetermined rate (x%), the process returns to step (e1) It is judged that the image is being used, and it is checked again whether the screen change is equal to or more than a predetermined number of frames per second (S45); (e5) As a result of the determination in the step (e4), if the screen change is equal to or more than a predetermined number of frames per second, the moving picture is executed, and the process returns to the step (e1). If the screen change is less than the predetermined number of frames per second And proceeding to the next step; (e7) If it is determined in step (e5) that the moving image is not to be executed, the parameter 'N' is incremented (S48). (S49); And (e8) if it is determined in step (e7) that 'N> No', it returns to step (e2) and repeats the process until the predetermined number of times from step (e2) If it is " No ", proceeding to step (f '); .

Preferably, the first switching device 51 is inserted between the SMPS 20 and the inverter 70, and the first switching device 51 is controlled by the MCU 31, The supply of the driving power source 19V from the SMPS 20 to the inverter 70 is controlled by the MCU 31 and the second switching element 30 is also provided between the SMPS 20 and the display controller 30 ' The second switching device 61 is also controlled by the MCU 31 so that the MCU 31 can control the switching of the SMPS 20 from the SMPS 20 to the display controller 30 ' The MCU 31 controls the supply of the operating power source 5V so that when the clock signal is not inputted as a result of grasping the clock signal between the transmitting side and the receiving side connectors and the MCU 31 itself Analyzes the monitor screen and determines that the user is not using the PC In the case where, or if at least one of any of these, characterized by that the transition to hibernate mode.

Preferably, before step (e '), (a) when the monitor power is turned on (S10), a monitor booting is performed (S11); (b) after step (a), performing a screen change rate analysis of a monitor screen (S30); (c) If it is determined in step (b) that the screen change is not equal to or less than the predetermined number of frames per second, the control unit continuously checks the brightness. If the screen change is less than the predetermined number of frames per second, Modulates the luminance value data in the second mixer 31b based on the lookup table on the firmware 38 and outputs the modulated luminance value through the inverter 70 or directly to the LED panel to output the luminance signal To perform the control for dropping the light beam; (D) compensating pixel data (O_PIXEL) of the original input image according to the luminance modulation of the backlight, simultaneously with the execution of the step (c); And further comprising:

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According to another aspect of the present invention, there is provided a method of controlling a power saving display through brightness correction of a monitor, comprising the steps of: (a) when a monitor power is turned on (S10) A step (S20) in which the MCU 31 checks whether the clock signal from the controller 18 is off; (b1) when the clock signal is off as a result of the determination in step (a), turning off the display main power; (b2) if it is determined in step (a) that the clock signal is not off, the MCU 31 performs a screen change rate analysis on the monitor screen to check whether the moving picture is executed (S30); (c) If it is determined in step (b2) that the screen change is not equal to or less than the predetermined number of frames per second, the control unit continuously checks the brightness. If the screen change is less than the predetermined number of frames per second, A step of modulating the luminance value data in the second mixer 31b with respect to the PWM signal and outputting the modulated luminance value through the inverter 70 or directly to the LED panel so as to perform the control to lower the luminance S31); (d) simultaneously with the step (c), pixel data O_PIXEL of the original input image is compensated in accordance with the luminance modulation of the backlight to compensate for the luminance reduction of the displayed image after luminance modulation (BM) of the backlight (Step S32) of performing pixel compensation (PIXEL_C) of the pixel data for the pixel data; (e ') After the step (d), the MCU 31 determines whether the user continues to use the monitor. The MCU 31 performs control to turn off both the first and second switches 51 and 61 so that the SMPS 51 and the second switch 51 are turned off, (20), thereby turning off all the monitor power supplies except for the minimum standby power supply; (E ') comprises: (e1) initializing (S40) a repetition number parameter (N); (e2) capturing and storing the entire screen of the monitor (S41), capturing and saving the changed screen (S42); (e3) Monitor screen change is less than a certain percentage (x%)? (S44) of judging whether or not it is judged whether or not it is judged that the user is in the step (e4) If it is judged in the step (e3) that the ratio is less than the predetermined ratio (x%), the process returns to the step (b2) , It is determined that the entire screen is being used, and now it is checked again whether the screen change is equal to or more than a predetermined number of frames per second (S45). (e5) If it is determined in step (e4) that the screen change is equal to or more than a predetermined number of frames per second, the moving picture is executed, and the process returns to step (b2). If the screen change is less than the predetermined number of frames per second And proceeding to the next step; (e7) If it is determined in step (e5) that the moving image is not to be executed, the parameter 'N' is incremented (S48). (S49); And (e8) if it is determined in step (e7) that 'N> No', it returns to step (e2) and repeats the process until the predetermined number of times from step (e2) If it is " No ", proceeding to step (f '); .

Preferably, in the step (e5), if the screen change is less than a predetermined number of frames per second as a result of the determination in the step (e4), it is determined that the video is not once executed. (E6), if it is determined in step (e5) that there is a repetitive screen change, it is determined that the flash advertisement is executed, and then the screen change Is it continuous in the horizontal direction? (Step S47); (E7), if the screen change is continued in the horizontal direction as a result of the determination in the step (e6), the control unit also returns to the step (b2) and continuously executes the screen change, If the change does not continue in the horizontal direction, the parameter 'N' is incremented (S48), and whether it is 'N> No'? (Step S49). If it is determined in step (e5) that there is no repetition of the screen change, it is determined that there is almost no screen change and that neither the execution of the video nor the flash advertisement is performed, .

More preferably, in the step (e1), the repetition number parameters (N) and (Y) are all initialized, and in the step (f '), Y 'is incremented by a predetermined reference value Yo (step S50), or if the screen change is not repeated as a result of the determination in step (e5), another parameter' Y 'is incremented The MCU 31 turns off the monitor power supply only when it is determined that the monitor is not used even when the number of times is repeated by the number of times Yo.

According to the control method of the power saving display through the monitor brightness correction according to the present invention, it is possible to provide a control method of the power saving display through the correction of the monitor brightness capable of substantially saving the monitor, The power saving efficiency can be further improved by determining whether to enter the power saving mode by itself or by searching only a part of the display scan line.

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.
4A is a structural view showing an example of a general direct-type liquid crystal display device according to the related art.
4B is a structural view showing an example of a liquid crystal display device adopting a conventional general side-type backlight unit.
5 is a plan view showing a structure of a conventional general color filter.
6A is a structural view illustrating a liquid crystal display device to which a backlight unit according to a third related art is applied.
6B is a perspective view showing the structure of the backlight unit shown in FIG. 6A. FIG.
7 is a structural view showing a liquid crystal display device to which another backlight unit according to the third related art is applied.
8 is a block diagram conceptually showing a power control device of a display device according to a fourth prior art.
9 is a flow chart conceptually showing a power control method of a display device according to a fourth prior art.
10 is a block diagram of a display device used in an electronic device according to a fifth conventional technique.
11 is a flow chart of a method for LCD display compensation when the backlight according to the fifth prior art is adjusted.
FIG. 12 is a block diagram of a control apparatus and peripheral device of a power saving display through monitor luminance correction according to a preferred embodiment of the present invention; FIG.
13 is a flowchart illustrating an operation of a method of controlling a power saving display through monitor luminance correction according to a preferred embodiment of the present invention.
14 is a flowchart of a method of controlling a power saving display through monitor luminance correction according to a modification of the optimum embodiment of the present invention.
15 is a conceptual diagram for explaining luminance modulation by the PWM method in the present invention.
16 is a conceptual diagram for explaining pixel data compensation in the present invention;

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

First, an apparatus and method for controlling a power saving display through monitor brightness correction according to the preferred embodiment of the present invention will be described with reference to FIGS. 12 to 16. FIG.

FIG. 12 is a block diagram of a control device and a peripheral device of a power saving display through monitor luminance correction according to the best mode of the present invention, and FIG. 13 is a flowchart illustrating a method of controlling a power saving display through monitor brightness correction according to a preferred embodiment of the present invention FIG. 14 is a flowchart of an operation of a control method of a power saving display through monitor luminance correction according to a modification of the optimum embodiment of the present invention, and FIG. 15 is a conceptual diagram illustrating brightness modulation by the PWM method in the present invention And Fig. 16 is a conceptual diagram for explaining pixel data compensation in the present invention.

As shown in FIG. 12, the control apparatus of the power saving display through the monitor luminance correction of the optimal embodiment of the present invention includes an SMPS 20 for supplying power to the display, A monitor control unit 30 for controlling the operation of the monitor, a receiver for providing a video input signal (monitor signal) from the main board 10 to the monitor control unit, an inverter 70 for supplying the monitor 70 to the LED panel Side connector 40 and a key control unit 90 including buttons for setting the operation of the monitor. The monitor control unit 30 includes an MCU 31, The display controller 30 ', the inverter 70, and the LED panel for controlling power supply from the SMPS 20 while performing interfacing with the inverter 70 and the LED panel 40, Includes the LVDS panel interface 35, and firmware 38, the addition can be added such as a power manager (Power management), OSD, and flash memory.

More specifically, the MCU 31 is a main body that performs operations of the entire control unit, and performs interfacing with the firmware 38, the flash memory, and the key control unit 90, Various control operations are performed.

The receiving side connector (TMDS Rx) 40 further includes a transmitting side connector (TMDS Tx) 19 for interfacing with the graphic controller 18 such as a VGA of the main board 10 and a transmission side connector (RGB, for example) and a clock signal (SCL) according to a differential signaling (Differential Signaling) protocol are transmitted through the monitor cables of respective unique channels (Channel 0, 1, 2, Clock Channel) The receiving side connector TMDS Rx 40 has a receiving side encoder converter 40a and a PLL 40b and correspondingly the transmitting side connector TMDS Tx 19 is also connected to a transmitting side encoder converter 19a and a PLL 19b. The display controller 30 'receiving the monitor data from the graphic controller 18 in a direction opposite to the SCL signal determines whether the monitor is properly connected to the DDC terminal of the graphic controller 18 through the DDC terminal (SDL) is transmitted and echoed back. For example, each of the RGB signals may be 8-bit data, so that the color palette information may be total 24-bit data, for example, a total of 2 ²⁴ = 16 million pixel palette information.

Particularly, a first switching device 51 is inserted between the SMPS 20 and the inverter 70, and the first switching device 51 is controlled by the MCU 31, The supply of the driving power source 19V from the SMPS 20 to the inverter 70 is controlled by the first switching element 31 and the second switching element 30 'is also provided between the SMPS 20 and the display controller 30' And the second switching device 61 is also controlled by the MCU 31 so that the MCU 31 can control the operation from the SMPS 20 to the display controller 30 ' So that the supply of the power source (5V) is controlled.

In addition, the MCU 31 controls power supply (19V) from the SMPS to the inverter. That is, in the sleep mode in which the SCL signal is recognized through the 'GPIO 4' terminal, the MCU 31 transmits the first switch 51 and the second switch 61 through the 'GPIO 3' And turns on / off the inverter 70 and the display controller 30 'by turning on / off the power. In particular, when the MCU 31 itself analyzes the monitor screen and determines that the user is not using the PC If the wake-up signal is not input within a specific time, the system goes into a hibernation mode in which all but the firmware 38 is inactivated. Particularly, instead of directly applying the pixel data of the monitor signal to the inverter 70 and the LED panel through the display controller 30 'and the LVDS panel interface 35, the original pixel data (Original PIXEL data is inputted to the terminal of the GPIO 5 of the MCU 31 through the O_PIXEL terminal of the display controller 30 'and then the corrected pixel data PIXEL data ) Is outputted to the inverter 70 through the terminal 'PIXEL_C'. Similarly, the brightness information of the LED panel is inputted from the LVDS panel interface 35 to the terminal of the 'GPIO 6' of the MCU 31, and then the brightness information (brightness information) modulated through the second mixer 31b Brightness Modulation) is outputted to the inverter 70 through the 'BM' terminal. The correction and modulation control signals of the first and second mixers 31a and 31b refer to a preset lookup table and are inputted through the GPIO 1 terminal from the firmware 38 in which the lookup table is located , Correction and modulation are performed by control values from the lookup table information. This will be described later with reference to FIG. 15 and FIG.

In addition, the MCU 31 receives the key control signal of the key control unit 90 through the GPIO 2 terminal, or conversely through the GPIO 2 terminal during the deep sleep mode, 90 may be generated such that a power-off effect that causes the power-off button of the power source 90 to be pressed is generated. This is disclosed in detail in Korean Patent Application No. 2016-164287 (Control Apparatus and Method of Power Saving Monitor Supporting Deep Sleep Mode) of the present inventor.

Therefore, in the sleep mode, the monitor control unit 30 can receive the input signal with a minimum power of about 0.3 W that only operates the firmware. When the wake up event is received, the monitor control unit 30 turns on the monitor power.

That is, only the firmware that can check the wakeup state from the main mode is activated (in this case, the MCU 31 transmits the trigger signal to the SMPS 20, (For example, an off signal of about 50 ms) that the user presses the power-off button in the key control unit 90 for deactivating the entire remaining monitor control unit.

Of the video input signals outputted to the receiving side connector 40 of the display by the CPU and the graphic controller 18 on the main board 10 of the desktop, the clock signal is also directly connected to the MCU 31, It is also possible to cause the MCU 31 to start and stop the operation by the VGA signal from the main board of the computer. In accordance with the look-up table of the firmware, the power switch of the key control part is triggered or the luminance modulation and the pixel data The correction may be performed.

The control signal to the switching device 61 is supplied from the MCU 31 and is interlocked with the firmware 38 or the key control 90. When the MCU 31 enters the sleep mode, 31 switches to the sleep mode (S3 mode) in which the power supply to the inverter is stopped through the SMPS by turning off the switching element by setting the control signal to the switching element 61 to "H" In addition, in the maximum power saving mode, the mode is shifted to the maximum power saving mode in which all of the monitor control unit 30 is deactivated except for the firmware 38. [ To summarize this briefly, the monitor is kept 'off' when there is no clock signal in the video input signal or the user does not use the monitor, and if the wakeup does not continue after that, the monitor power button is completely turned off If there is not much change in the screen even during operation, the brightness of the dark pixel is reduced to conserve power.

Now, the operation of the monitor control unit will be described in more detail with reference to FIGS. 13 and 14. FIG.

Referring to FIG. 13, the control method of the power saving display through the monitor brightness correction according to the present invention is as follows. When the monitor power is turned on (S10) S11), the screen change rate analysis of the monitor screen is executed first (S30). For example, it is checked whether the monitor screen change is 30 frames per second or less. This is to check whether or not the monitor is moving picture, and since there is no meaning of luminance decay during moving picture execution, it is first checked before luminance decay is performed.

If it is determined in step S30 that the screen change is not 10 frames or less per second (if it is judged that the moving picture is being executed), it is checked continuously. If the screen change is 10 frames or less per second The second mixer 31b modulates the luminance value data based on the lookup table on the firmware 38 with respect to the PWM signal indicating the brightness of the luminance and outputs the modulated luminance value to the inverter 70 Or directly output to the LED panel, thereby controlling the brightness to be lowered (S31). In this case, it is preferable to use the pulse width modulation method rather than the amplitude modulation method of the "Bright" signal, which is easy to control. For example, with respect to the PWM method in which the duty ratio is 50% 15. However, this 50% is only an example, and a lookup table can be created so as to lower the luminance in three steps in consideration of the brightness of the original pixel data.

At the same time, the pixel data O_PIXEL of the original input image must be compensated according to the luminance modulation of the backlight, that is, after the backlight luminance modulation (BM), the luminance decreases, The pixel compensation (PIXEL_C) of the pixel data is performed in order to compensate for the decrease in luminance of the displayed pixel (S32).

For example, as shown in FIG. 16B, the original input pixel data is required to express the 'C' color. However, when the luminance is reduced by about 50% in order to save energy, The pixel data to be corrected represents a color D which is brighter than the original input pixel data (for example, R = 1111111, G = 0, B = 0) (For example, R = 1111110, G = 0, B = 0) to be corrected and output. This can be done by storing the correction values in advance in the look-up table in consideration of the characteristics of the color pallet and the display. Similarly, original original input pixel data would have to represent an 'A' color, but to save energy, if the luminance was reduced by 25%, the 'B' color would be displayed, The corrected pixel data is corrected and output with the corrected pixel data representing the 'A' color brighter than the original input pixel data.

As a result, the corrected pixel control is performed with less light interception by the darker modulated luminance and the corrected pixel data, so that the same color pixel is displayed on the monitor while saving energy by using less backlight.

However, since it is required that the above-mentioned luminance control should not be performed during moving image output and that it should be a dark pixel to some extent, pixel data should be opened to the maximum even in bright luminance terms for extremely bright pixel data, This is because the same color can not be displayed through the correction of the pixel data. The lookup table for this also needs to be prepared in advance.

If it is determined that the monitor is turned off, the MCU 31 sets 'GPIO 3' to 'Low' to determine whether the monitor is turned off or not (step S60) 51, and 61 are all turned off to shut off all the power sources output from the SMPS 20, thereby turning off all the operation power sources except for the minimum standby power source (PIO 1.2V).

If it is determined at step S80 that wake-up has occurred from the main board 10 at a predetermined time interval, it is determined that wake-up has occurred, and the process returns to step S30 and starts again. Otherwise, 2 'terminal to' low ', and the power control signal is applied as if the power switch of the key control unit 90 is turned off, thereby turning off the display completely.

A modification of the present invention will now be described in detail with reference to Fig.

First, in this modification, whether the clock signal (SCL signal) from the graphic controller 18 of the main board 10 is off is set to 'GPIO 4' of the MCU 31 when the monitor power is turned on (S20). If the clock signal (SCL signal) is off, the process proceeds to step S70 and the power is immediately turned off via the 'GPIO 3' terminal. And the step S90 may be performed and terminated.

Then, as shown in FIG. 13, the screen change rate analysis of the monitor screen is performed to check whether or not the moving picture is executed (S30).

If it is determined in step S30 that the screen change is not less than 10 frames per second (if it is determined that the moving picture is being executed), it is checked continuously. If the screen change is 10 frames or less per second The second mixer 31b modulates the luminance value data based on the lookup table on the firmware 38 with respect to the PWM signal indicating the brightness of the luminance and outputs the modulated luminance value to the inverter 70 Or directly output to the LED panel, thereby controlling the luminance to be lowered.

At the same time, the pixel compensation (PIXEL_C) of the pixel data for compensating the luminance reduction of the displayed image after the luminance modulation (BM) of the backlight is performed by compensating the pixel data O_PIXEL of the original input image according to the luminance modulation of the backlight, (S32).

13, it is determined whether the user is using the monitor (S40 to SS51). First, the parameters N and Y for checking the number of repetitions are initialized to '1' (S40).

Then, the entire screen of the monitor is captured and stored (S41), and the changed screen is captured and stored (S42). At this time, the entire monitor can be captured and stored, and only a part ) Can be captured and stored. In the latter case, it is checked whether or not there is a change in the number of K-times pixels (S43). If there is no change, the screen is continuously checked. (For example, 20% or less?) (S44).

If it is less than x% (S44), the process returns to step S30 and starts again from whether or not the moving image is executed. If the changed pixel is greater than a certain percentage (x%) , It is determined that the entire screen is being used, and it is again checked whether the screen change is 10 frames or more per second (S45).

Therefore, if the screen change is 10 frames or more per second, the video is executed. Therefore, the process returns to step S30. If the screen change is less than 10 frames per second, it is determined that the video is not once executed. (S46).

As a result of the determination in step S46, if there is a repetitive screen change, it is determined that the flash advertisement is executed. (S47). The reason for checking as in step S47 is that if the user types characters slowly, the monitor should not be stopped because the user is using the computer even though the screen is not changed much .

As a result of the determination in step S47, if the screen change is continued in the horizontal direction, the process returns to step S30 and continues from the beginning. If the screen change does not continue in the horizontal direction, (Step S48), it is checked whether or not 'N> No' (for example, No = 15) (step S49). If it is not the predetermined number of times (for example, 15 times) If it is determined in step S49 that 'N> No' (for example, if No> 15), the process proceeds from step S42 to step S49 repeatedly until a predetermined number of times (for example, 15 times) The output of the 'GPIO 3' terminal of the MCU 31 is set to 'Low', and the monitor power is turned off. The subsequent process may proceed to steps S80 and S90 of FIG. 13, or may be terminated immediately.

In particular, if it is determined in step S46 that there is no repetitive change in the screen, there is almost no change in the screen, and neither the video execution nor the flash advertisement is performed. Set the output to 'Low' to turn off the monitor power.

As a result of the determination in step S49, since there may be an error only by one check, another parameter 'Y' is incremented (S50), and 'Y' is incremented by a certain reference value Yo , The output of the 'GPIO 3' terminal of the MCU 31 is set to 'Low' to turn off the monitor power supply only when it is determined that the monitor is not used even if the number of iterations is repeated as many times as the number of times Yo. It is more preferable to return to step S41 and repeat steps S41 to S51.

Note that even if the power supply is turned off, the power is still connected to the SMPS for supplying power to the monitor, so that power consumption of about 0.3 W is consumed if the monitor power plug is unplugged, It is different from the final state when the monitor power plug is unplugged, but this power consumption is almost negligible.

Accordingly, in the conventional monitor control unit, the power consumption of 1.4 W is consumed in the sleep mode. However, according to the control method of the power saving display through the monitor brightness correction of the present invention, in the maximum power saving mode, , It is reduced from 1.4W to 0.3W, saving about 1.1W per PC. Moreover, even when the monitor is in use, the LED panel which occupies most of the monitor power source without changing the color displayed on the actual monitor By reducing the power by half, you can save energy on a regular basis.

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.

10: main board 18: graphic controller
19: transmitting side connector 19a: encoder converter
20: SMPS (for monitor)
30: Monitor control unit 30 ': Display controller
31: MCU 31a: first mixer
31b: Mixer 35: LVDS panel interface
38: Firmware 40: Receiver connector
51: first switching element 61: second switching element
70: Inverter 90: Key control unit

Claims (7)

An SMPS (20) for supplying power to the display; An inverter 70 for inverting the voltage from the SMPS and supplying the inverted voltage to an LED panel that operates as a backlight of a display screen; A monitor control unit (30) for controlling the operation of the monitor; A receiving side connector 40 for providing a video input signal from the main board 10 to a monitor control unit; A key control unit 90 comprising buttons for setting the operation of the monitor; The monitor control unit 30 includes an MCU 31 for performing operations of the overall control unit and a display controller 30 for controlling whether power is supplied from the SMPS 20 while interfacing with the reception side connector 40 An inverter 70 and an LVDS panel interface 35 for controlling and controlling the interface with the LED panel and a firmware 38. The receiving connector (TMDS Rx) (TMDS Tx) 19 for interfacing with the graphic controller 18 of the main board 10 and the monitor signal and the clock signal SCL are received via the monitor cable and the original pixel data (Original PIXEL data) Is inputted from the display controller 30 'to the MCU 31 and then pixel data corrected through the first mixer 31a is outputted to the inverter 70, The luminance information (Brightness) The control of the power saving type display through the brightness correction of the monitor which is inputted to the MCU 31 from the interface 35 and then the brightness information modulated through the second mixer 31b is outputted to the inverter 70 A control method of a power saving display through correction of monitor luminance of an apparatus,
(e ') The MCU 31 judges whether or not the user continues to use the monitor; And
the MCU 31 performs control to turn off both the first and second switches 51 and 61 so that the SMPS (f ') is turned off, 20) so that all the monitor power sources except the minimum standby power source are turned off;
/ RTI >
The step (e ') comprises:
(e1) initializing a repetition number parameter (N) (S40);
(e2) capturing and storing the entire screen of the monitor (S41), capturing and saving the changed screen (S42);
(e3) Monitor screen change is less than a certain percentage (x%)? (S44) of judging whether or not it is judged whether or not it is judged that the user is in the step
(e4) If it is determined in step (e3) that the rate of change is less than a predetermined rate (x%), the process returns to step (e1) It is judged that the image is being used, and it is checked again whether the screen change is equal to or more than a predetermined number of frames per second (S45);
(e5) As a result of the determination in the step (e4), if the screen change is equal to or more than a predetermined number of frames per second, the moving picture is executed, and the process returns to the step (e1). If the screen change is less than the predetermined number of frames per second And proceeding to the next step;
(e7) If it is determined in step (e5) that the moving image is not to be executed, the parameter 'N' is incremented (S48). (S49); And
(e8) If it is determined in step (e7) that 'N>No', the process returns to step (e2) and repeats the process until the predetermined number of times from step (e2) No ', proceeding to step (f');
And controlling the brightness of the display device. The method according to claim 1,
A first switching device 51 is inserted between the SMPS 20 and the inverter 70 and the first switching device 51 is controlled by the MCU 31, So that supply of the driving power supply 19V from the SMPS 20 to the inverter 70 is controlled,
The second switching element 61 is also inserted between the SMPS 20 and the display controller 30 'and the second switching element 61 is also controlled by the MCU 31, The supply of the operating power source 5V from the SMPS 20 to the display controller 30 'is controlled by the MCU 31,
When the clock signal is not inputted as a result of the clock signals between the transmitting side and the receiving side connectors, the MCU 31 analyzes the monitor screen by itself and the user's PC usage The control unit switches the mode to the maximum power saving mode when it is determined that the power saving mode is not the power saving mode or when at least one of them is selected. The method according to claim 1, wherein, before the step (e '),
(a) when the monitor power is turned on (S10), the monitor booting is performed (S11);
(b) after step (a), performing a screen change rate analysis of a monitor screen (S30);
(c) If it is determined in step (b) that the screen change is not equal to or less than the predetermined number of frames per second, the control unit continuously checks the brightness. If the screen change is less than the predetermined number of frames per second, Modulates the luminance value data in the second mixer 31b based on the lookup table on the firmware 38 and outputs the modulated luminance value through the inverter 70 or directly to the LED panel to output the luminance signal To perform the control for dropping the light beam; And
(d) a step (S32) of compensating pixel data (O_PIXEL) of the original input image according to the luminance modulation of the backlight, simultaneously with the execution of the step (c);
The method of claim 1, further comprising the steps of: delete (a) when the monitor power is turned on (S10), the MCU 31 checks whether the clock signal from the graphic controller 18 of the main board 10 is off (S20);
(b1) when the clock signal is off as a result of the determination in step (a), turning off the display main power;
(b2) if it is determined in step (a) that the clock signal is not off, the MCU 31 performs a screen change rate analysis on the monitor screen to check whether the moving picture is executed (S30);
(c) If it is determined in step (b2) that the screen change is not equal to or less than the predetermined number of frames per second, the control unit continuously checks the brightness. If the screen change is less than the predetermined number of frames per second, A step of modulating the luminance value data in the second mixer 31b with respect to the PWM signal and outputting the modulated luminance value through the inverter 70 or directly to the LED panel so as to perform the control to lower the luminance S31);
(d) simultaneously with the step (c), pixel data O_PIXEL of the original input image is compensated in accordance with the luminance modulation of the backlight to compensate for the luminance reduction of the displayed image after luminance modulation (BM) of the backlight (Step S32) of performing pixel compensation (PIXEL_C) of the pixel data for the pixel data;
(e ') After the step (d), the MCU 31 determines whether the user continues to use the monitor. And
the MCU 31 performs control to turn off both the first and second switches 51 and 61 so that the SMPS (f ') is turned off, 20) so that all the monitor power sources except the minimum standby power source are turned off;
/ RTI >
The step (e ') comprises:
(e1) initializing a repetition number parameter (N) (S40);
(e2) capturing and storing the entire screen of the monitor (S41), capturing and saving the changed screen (S42);
(e3) Monitor screen change is less than a certain percentage (x%)? (S44) of judging whether or not it is judged whether or not it is judged that the user is in the step
(e4) If it is judged in the step (e3) that the ratio is less than the predetermined ratio (x%), the process returns to the step (b2) , It is determined that the entire screen is being used, and now it is checked again whether the screen change is equal to or more than a predetermined number of frames per second (S45).
(e5) If it is determined in step (e4) that the screen change is equal to or more than a predetermined number of frames per second, the moving picture is executed, and the process returns to step (b2). If the screen change is less than the predetermined number of frames per second And proceeding to the next step;
(e7) If it is determined in step (e5) that the moving image is not to be executed, the parameter 'N' is incremented (S48). (S49); And
(e8) If it is determined in step (e7) that 'N>No', the process returns to step (e2) and repeats the process until the predetermined number of times from step (e2) No ', proceeding to step (f');
And controlling the brightness of the display device. 6. The method of claim 5,
As a result of the determination in step (e4), if it is determined that the screen change is less than the predetermined number of frames per second, step (e5) (S46)
The step (e ') comprises:
(e6) As a result of the determination in step (e5), if the screen change is repetitive, is it determined that the flash advertisement is executed and continues the screen change in the horizontal direction? (Step S47);
Further comprising:
If it is determined in step (e6) that the screen change is continued in the horizontal direction, the step (e7) may return to step (b2) and continue from the beginning, If it is not persistent, the parameter 'N' is incremented (S48) and whether it is 'N>No'? (S49)
If it is determined in step (e5) that there is no repetitive screen change, it is determined that there is almost no screen change and that neither the video execution nor the flash advertisement is performed, A method of controlling a power saving display through correction. The method according to claim 6,
In step (e1), all of the repetition number parameters (N) and (Y) are initialized,
The step (f ') may further comprise the step of, when it is determined in the step (e8) that the result of the determination in the step (e5) Only when it is determined that the monitor is not used even if Y is incremented (S50) and repeated until Y is equal to the predetermined reference value Yo times, And the power of the monitor is turned off.

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