KR102390514B1 - Method for managing managing power consumption of LED(light emitting diode) sign and LED sign for performing the method - Google Patents

Abstract

The present invention relates to a method for managing power consumption of an LED signboard and an LED signboard for performing the method. The method for managing the power consumption of the light emitting diode (LED) signboard may comprise: a step of receiving, by a control part, a current value used when displaying an image on the LED signboard based on a current sensor; a step of determining, by the control part, whether to smooth the current based on the current value; and a step of outputting, by the control part, the image on the LED signboard based on the determined smoothing current value based on the current smoothing. Therefore, an objective of the present invention is to save the power consumption of the LED signboard.

Description

A method for managing power consumption of an LED sign and an LED sign for performing such a method {Method for managing managing power consumption of LED (light emitting diode) sign and LED sign for performing the method}

The present invention relates to a method for managing power consumption of an LED sign and to an LED sign for performing such a method. It relates to a method for managing power consumption of an LED sign using a current sensor, and an apparatus for performing such a method.

Electronic billboards are used to display advertisements or information such as trade names, sales products, and business items in shops, restaurants, companies, and various sales offices, and are installed in places that can attract people's attention, such as outside walls of buildings. In general, an electric sign board has a structure in which a lighting device is provided inside a rectangular frame and a display panel on which characters, figures, symbols, images, etc. are displayed on the front of the frame is disposed.

Recently, the demand for LED signage using LED is increasing significantly. Compared to other light emitting devices, LEDs are stable and reliable, have low power consumption, and have a long lifespan. LED signage uses an LED matrix to express characters, and unlike the static electric signboard, it can express variously changing characters, graphics, and images, so it can be used for various purposes such as advertisements, publicity media, situation boards, and information delivery media. is being used as

The LED signage consists of a number of LED lamps mounted on the front of the main frame in the form of a grid, so that the LED lamps are combined with a number of LED panels that represent one pixel of the screen. is driven on/off to display an advertisement image in units of screens.

At this time, the number of LED lamps turned on and driven from the LED panel is different according to the type of advertisement image, and at most, all LED lamps mounted on the LED panel are driven on. Since LED signage operates based on electric energy, there is an issue about power consumption.

Therefore, it is necessary to study how to minimize the effect on the visibility of the LED signboard, but to reduce the power consumption of the LED signboard.

An object of the present invention is to solve all of the above problems.

In addition, an object of the present invention is to save power consumption of the LED signage based on the current value measured by the current sensor of the LED signboard.

In addition, an object of the present invention is to determine the image output from the LED signboard based on the current sensor, manage the power consumption of the LED signboard, but naturally output the image from the LED signboard without reducing visibility.

A representative configuration of the present invention for achieving the above object is as follows.

According to an embodiment of the present invention, the method for managing power consumption of a light emitting diode (LED) sign includes the step of receiving, by a controller, a current value used for displaying an image on the LED signboard based on a current sensor, wherein the controller includes the Determining whether to smooth the current based on the current value and outputting, by the controller, the image on the LED signboard based on the smoothing current value determined based on the current smoothing.

Also, the current smoothing may be performed based on one smoothing type among a plurality of smoothing types, and the plurality of smoothing types may be classified based on whether the current value is controlled in proportion to a change in the current value.

Meanwhile, the smoothing type may be determined based on a current gradient, an external environment, and an amount required to reduce power consumption.

According to another embodiment of the present invention, a light emitting diode (LED) sign for performing power consumption management includes a current sensor that senses a current value used when displaying an image on the LED sign and whether current is smoothed based on the current value and a controller implemented to output the image on the LED signboard based on the smoothing current value determined based on the current smoothing.

Meanwhile, the current smoothing may be performed based on one smoothing type among a plurality of smoothing types, and the plurality of smoothing types may be classified based on whether the current value is controlled in proportion to a change in the current value.

Also, the smoothing type may be determined based on a current gradient, an external environment, and a required amount of power consumption reduction.

According to the present invention, the power consumption of the LED signage can be saved based on the current value measured by the current sensor of the LED signboard.

In addition, according to the present invention, the image output from the LED signboard is determined based on the current sensor, and the power consumption of the LED signboard is managed, but the image can be naturally outputted from the LED signboard without reducing visibility.

1 is a conceptual diagram showing an LED signboard according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a display control method based on an amount of current according to an embodiment of the present invention.
3 is a conceptual diagram illustrating a current control method according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a current control method according to an embodiment of the present invention.
5 is a conceptual diagram illustrating a method for determining a smoothing type according to an embodiment of the present invention.
6 is a conceptual diagram illustrating a method for controlling an LED signboard according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a method for adjusting luminance based on an illuminance sensor according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] Reference is made to the accompanying drawings, which show by way of illustration specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be implemented with changes from one embodiment to another without departing from the spirit and scope of the present invention. In addition, it should be understood that the location or arrangement of individual components within each embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention should be taken as encompassing the scope of the claims and all equivalents thereto. In the drawings, like reference numerals refer to the same or similar elements throughout the various aspects.

Hereinafter, various preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to enable those of ordinary skill in the art to easily practice the present invention.

1 is a conceptual diagram showing an LED signboard according to an embodiment of the present invention.

In FIG. 1, an LED sign capable of managing power consumption based on a current sensor is disclosed.

Referring to FIG. 1 , the LED signboard may include a display 100 , a current sensor 120 , and a controller 140 .

The display 100 may include a plurality of LED modules. Each of the plurality of LED modules may include a plurality of LED pixels serving as pixels. The size of the display 100 may be changed according to the number of LED modules constituting the display 100 .

The current sensor 120 may be implemented to sense the magnitude of the current generated in the plurality of LED modules. In other words, the current sensor 120 may be implemented to sense a current value required for the display 100 . The LED signboard according to an embodiment of the present invention may periodically (or repeatedly) output a still image and/or a moving image for advertisement, and current values used in a plurality of LED modules may be different according to an output screen.

In the present invention, the power consumption of the LED sign can be adjusted by adjusting the current value supplied to the display 100 including a plurality of LED modules. In the present invention, the brightness of the LED pixel is controlled through the control of the current value supplied to the display 100, and a control algorithm for minimizing the visibility of the signboard and the discontinuity of the image due to the control of the brightness may be used.

When a current exceeding a set threshold is supplied to the display 100 based on the current value measured by the current sensor 120 , the controller 140 may limit the current value supplied to the display 100 . The controller 140 controls the current value greater than or equal to the set threshold, but determines the smoothing type based on the current data, thereby minimizing the visual step due to the visibility of the signboard and the discontinuity of the brightness of the image.

In addition, the controller 140 determines an image type such as a still image and/or a moving image based on the current value measured by the current sensor 120, and uses a different method for a still image and a moving image. The current value can be controlled.

A current control operation of the controller 140 will be described in detail later.

2 is a conceptual diagram illustrating a display control method based on an amount of current according to an embodiment of the present invention.

In FIG. 2 , a method of controlling an amount of current based on a set threshold 200 for a current value measured by a current sensor is disclosed.

Referring to FIG. 2 , the image output on the LED signboard may be changed, and the current value supplied to the display may be changed according to the change of the output image. The LED signboard may periodically output an advertisement image combining a still image and/or a moving image, and a change in the current value supplied to the LED signboard may also have periodicity.

The control unit may set a setting threshold based on the amount of supply current.

The setting threshold 200 may be a value set as a threshold value for controlling the current value. When the current value used in the display is less than the set threshold, the current may be supplied to the display without a separate adjustment of the amount of current. Conversely, when the current value used in the display is equal to or greater than the set threshold 200 , the current value adjusted through the adjustment of the current value may be supplied to the display.

In the present invention, when the value of the supplied current is greater than or equal to the set threshold 200, it is possible to reduce the overall power consumption used in the LED sign by reducing the value of the current supplied to the display.

According to an embodiment of the present invention, when the current value is relatively decreased, the luminance of the LED pixel may be relatively decreased. If the current value is simply filtered below the set threshold 200, it may give people who see the LED signboard a sense of heterogeneity due to the change in luminance of the image, and a problem with the visibility of the LED signboard may occur.

Therefore, in the present invention, in reducing the current value in order to solve the visibility problem of the LED sign due to the control of the current value, smoothing may be performed differently depending on the current value, and different A current control algorithm of this type may be applied.

3 is a conceptual diagram illustrating a current control method according to an embodiment of the present invention.

In FIG. 3, a method for reducing power consumption by defining a current control method (current smoothing type), and securing visibility of an LED sign is disclosed.

Referring to FIG. 3 , in the present invention, a method for applying different current control methods based on current value data is disclosed. In the present invention, current smoothing (or smoothing) may refer to a current reduction logic to more naturally reduce a current value.

For current control, a smoothing type may be defined in various ways. Smoothing type 1 310 , smoothing type 2 320 , and smoothing type 3 330 disclosed in the present invention are exemplary smoothing types, and various other smoothing types may be defined.

The smoothing type 1 310 may be a current smoothing type in which a current value is reduced in proportion to a change in the current value.

The smoothing type 2 320 may be a smoothing type in which a current value is reduced by using a fixed value that is partially proportional to the change in the current value and is not proportional to the current value. A non-proportional fixed value is determined based on the smoothing threshold.

The smoothing type 3 330 is not proportional to the change in the current value, but may be a smoothing type in which the current value is controlled to the same value according to the set threshold value 300 .

A smoothing type may optionally be used.

The smoothing type may be determined in consideration of a current gradient, an external environment, a required amount of power consumption reduction, and the like.

In the smoothing type 1 310 and the smoothing type 2 320 , smoothing of the current value may be performed in consideration of the current gradient for each current change measurement section. A current change measurement period is set, and smoothing may be performed in consideration of a current gradient and an absolute current value measured in the current change measurement period.

A current value changed through current smoothing may be expressed in terms of a smoothing current value.

Specifically, in the present invention, as a power consumption management method of an LED signboard, the controller receives a current value used when displaying an advertisement image on an LED signboard based on a current sensor, and the controller can determine whether to smooth the current based on the current value. . When the current value is greater than the set threshold, the controller may output an advertisement image on the LED signboard based on the smoothing current value determined based on the current smoothing.

4 is a conceptual diagram illustrating a current control method according to an embodiment of the present invention.

4 discloses a method of performing smoothing on a current value supplied to a display by setting a smoothing slope and a smoothing threshold.

Referring to FIG. 4 , a smoothing slope 440 is determined by reflecting a current change during smoothing. However, as the current value increases, the smoothing slope 440 may be set relatively small to reduce power consumption. The smoothing slope 440 is a value for reducing the amount of current by reflecting the current change. As the smoothing slope 440 is relatively large, the current change is reflected relatively more sensitively, so that a difference from the original image may be reduced.

In the present invention, a large smoothing gradient 440 means that the current value of the original image is reflected relatively much and the current value is reduced so that the difference from the current value of the original image is not relatively large. Conversely, the small smoothing slope 440 means that the current value of the original image is reflected relatively small and the current value is reduced so that the difference from the current value of the original image is relatively large.

The smoothing slope 440 may also be adaptively set according to the current gradient 410 , the external environment 420 , and the power consumption reduction demand 430 .

The current gradient 410 may be a value indicating the degree of change in current per unit time. In a time period in which the current gradient 410 is relatively large, the smoothing slope 440 may be set to be relatively large. Conversely, in a time interval in which the current gradient 410 is relatively small, the smoothing slope 440 may be set to be relatively small. That is, the time period in which the current gradient 410 is relatively large is a period in which the brightness changes are large, and the intensity of visually feeling the change may be large. Accordingly, in consideration of this point, the smoothing slope 440 may be set to be large in the section where the current gradient 410 is large.

In addition, when the external illuminance is relatively low in relation to the external environment 420 , the change in brightness of the LED signboard may be visually recognized as large. Accordingly, the smoothing slope 440 is set to be relatively large, so that the smoothing process may be performed by reflecting the current gradient 410 as much as possible. For example, in a situation where external illumination is relatively low, such as at night, a change in brightness of an LED sign can be recognized relatively large. Accordingly, since the smoothing slope 440 is set to be relatively large, the smoothing process may be performed to reflect a relatively large amount of current change in the original image. Conversely, in a situation where external illumination is relatively high, such as during the day, the change in brightness of the LED signboard may not be recognized relatively significantly. Accordingly, the smoothing gradient 440 is set to be relatively small to reflect the current gradient 410 of the original image relatively less, but the smoothing process may be performed to further reduce power consumption.

Also, according to an embodiment of the present invention, as the power consumption reduction demand 430 is relatively large, the smoothing slope 440 may be adjusted to a relatively small value. When the power consumption reduction request amount 430 is relatively large, the smoothing slope 440 may be set to a relatively small value to further reduce power consumption.

In this way, the smoothing slopes of the smoothing type 1 and the smoothing type 2 may be adjusted.

According to an embodiment of the present invention, the smoothing threshold 450 may be separately set for the smoothing type 2 . In the smoothing type 2 , a smoothing threshold 450 is set, and a current value exceeding the smoothing threshold 450 according to the smoothing threshold 450 may be fixed as a current value corresponding to the smoothing threshold 450 .

The smoothing threshold 450 may be a preset value or may be determined in consideration of a change in a current value greater than or equal to the preset threshold. The average value of the current values greater than or equal to the preset threshold may be set as the smoothing threshold 450 , or may be determined based on the current value in the region having the threshold current gradient 410 in consideration of the change in the current value greater than or equal to the preset threshold.

Also, like the smoothing slope 440 , the smoothing threshold 450 may be adaptively set according to the external environment 420 and the power consumption reduction demand 430 . For example, when the external illuminance is relatively low, a change in the brightness of the LED signboard may be visually recognized as large. Accordingly, the smoothing threshold 450 is set to be relatively large, so that the smoothing process may be performed by reflecting the current gradient as much as possible.

In addition, according to an embodiment of the present invention, as the power consumption reduction demand 430 is relatively large, the smoothing threshold 450 may be adjusted to a relatively small value. When the power consumption reduction request amount 430 is relatively large, the smoothing threshold 450 may be set to a relatively small value to further reduce power consumption.

5 is a conceptual diagram illustrating a method for determining a smoothing type according to an embodiment of the present invention.

5 discloses a method for determining a smoothing type.

Referring to FIG. 5 , the smoothing type may be determined in consideration of a current gradient 510 at which an LED sign is output, an external environment 520 , a power consumption reduction demand 530 , and the like.

When the current gradient 510 is equal to or greater than the first threshold gradient in consideration of the current gradient 510 of the current above the set threshold used in the display of the LED signage, smoothing type 1 is used, and the current gradient 510 is the second When the gradient is greater than or equal to the second threshold and less than the first gradient, smoothing type 2 may be used, and when the gradient 510 is less than the second threshold gradient, smoothing type 3 may be used. In this case, the first threshold gradient, the second threshold gradient, and the third threshold gradient may be small in the order.

That is, the larger the current gradient 510 is, the more the current change is reflected, so that visual heterogeneity due to current control can be reduced.

In addition, according to an embodiment of the present invention, the smoothing type may be determined in consideration of the illuminance of the external environment 520 in which the LED sign is output.

As smoothing type 1, smoothing type 2, and smoothing type 3 go, the difference with the current amount of the original image increases, and the visual sense of difference with the original image may increase.

In the present invention, the range of illuminance may be set to the first range, the second range, ?, and the nth range, and it can be assumed that the illuminance has a larger value as the first range, the second range, ?, and the nth range. there is.

If it is assumed that the first range, the second range, and the third range exist, smoothing type 1 may be set in the first range, smoothing type 2 may be set in the second range, and smoothing type 3 may be set and operated in the third range. Through this setting, different types of smoothing may be performed by reflecting the sensitivity to the LED luminance as the outside becomes darker.

Also, according to an embodiment of the present invention, the smoothing type may be determined in consideration of the required amount of power consumption reduction 530 and the like. As the power consumption reduction request amount 530 becomes relatively large, the smoothing type 1, the smoothing type 2, and the smoothing type 3 may be sequentially set.

That is, in the present invention, smoothing type 1, smoothing type 2, and smoothing type 3 are adaptively changed in consideration of current gradient 510, external environment 520, power consumption reduction demand 530, etc. to operate the LED signboard. can be controlled.

6 is a conceptual diagram illustrating a method for controlling an LED signboard according to an embodiment of the present invention.

In FIG. 6, a method of determining the image type output on the LED signboard based on the amount of current and performing smoothing according to the image type is disclosed.

Referring to FIG. 6 , an advertisement image in which a still image and a moving image are combined may be output on the LED signboard.

In the case of still images and moving images, people may visually perceive them differently, and different smoothing algorithms may be applied to still images and moving images in consideration of these visual characteristics.

Hereinafter, the first image type 650 may be an image type in which a change in the amount of supply current, such as a moving image, is relatively large. The second image type 660 may mean an image type in which the change in the amount of supply current, such as a still image, is not relatively large.

First, the processor may distinguish the first image type 650 and the second image type 660 based on the current data. When the degree of change of the amount of supply current is less than the current change threshold, the output image is divided into the second image type 660. When the degree of change of the amount of supply current is equal to or greater than the current change threshold, the output image is of the first image type ( 650) can be distinguished.

When the output image is the first image type 650 , current smoothing may be performed based on the set threshold set by the above-described method and the determined smoothing type.

When the output image is the second image type 660 , only smoothing type 3 among the above-described smoothing types may be used. Also, when the output image is the second image type 660 , a setting threshold value different from the setting threshold value of the first image type 610 may be separately set.

Hereinafter, the setting threshold of the first image type 610 is expressed as a setting threshold (first image) 610 , and the setting threshold of the second image type 660 is expressed as a setting threshold (second image) 620 . .

The setting threshold (second image) 620 may be set to a relatively smaller value than the setting threshold (first image) 610 . In addition, the setting threshold (second image) 620 is changed in consideration of the external environment in which the LED sign is output, and the smoothing type is changed in consideration of the required amount of power consumption reduction required, but the change width is relatively higher than the setting threshold (first image) 610 can be changed to be large.

In the case of a still image, since there is no continuous change in luminance during the output period, the change in brightness felt from the outside may be small. Accordingly, the range of change of the set threshold (second image) 620 according to the change of the external illuminance environment and the range of change of the set threshold (second image) 620 according to the demand for power consumption reduction are the set threshold (first image) 610 ) can be set larger than

7 is a conceptual diagram illustrating a method for adjusting luminance based on an illuminance sensor according to an embodiment of the present invention.

7 discloses a method for determining external environment information based on an illuminance sensor.

Referring to FIG. 7 , an illuminance value is determined based on an illuminance sensor set on each of the plurality of LED signboards, and the setting thresholds of the plurality of LED signboards may be adjusted according to the illuminance value.

A plurality of LED signs may be set based on one building, and a plurality of LED signs may transmit or receive data through mutual communication.

For example, if there are 4 LED signs (LED sign 1, LED sign 2, LED sign 3, LED sign 4) in one building, the first illuminance value of LED sign 1 and the second illuminance of LED sign 2 The value, the third illuminance value of the LED sign 3, and the fourth illuminance value of the LED sign 4 may be generated.

In the present invention, adjacent signboards can be controlled with the same logic so that the overall luminance difference is not large.

The final illuminance value may be determined in consideration of current values used in a plurality of signboards. In the present invention, it may be determined based on the average of the illuminance value of the LED sign that outputs the brightest image and the illuminance value of the LED sign that outputs the darkest image. An LED sign that outputs the brightest image and an LED sign that outputs the darkest image may be determined based on the LED current value. A setting threshold 720 and a smoothing threshold 740 are set for the control of the entire LED signage based on the illuminance, and by setting the setting threshold 720 and the smoothing threshold 740 in consideration of the properties of these adjacent signs, the brightness of The image can be output on the LED signboard by balancing it.

In the present invention, the final illuminance value 700 is determined based on at least one illuminance value among the first illuminance value, the second illuminance value, the third illuminance value, and the fourth illuminance value, and based on the final illuminance value 700 It is possible to adjust the setting threshold 720 and the smoothing threshold 740 of the plurality of signs.

The embodiments according to the present invention described above may be implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the computer-readable recording medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the computer software field. Examples of computer-readable recording media include hard disks, magnetic media such as floppy disks and magnetic tapes, optical recording media such as CD-ROMs and DVDs, and magneto-optical media such as floppy disks. medium), and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. A hardware device may be converted into one or more software modules to perform processing in accordance with the present invention, and vice versa.

In the above, the present invention has been described with reference to specific matters such as specific components and limited embodiments and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, Those of ordinary skill in the art to which the invention pertains can make various modifications and changes from these descriptions.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and the scope of the spirit of the present invention is not limited to the scope of the scope of the present invention. will be said to belong to

Claims (6)

How to manage the power consumption of LED (light emitting diode) signage,
receiving, by the controller, a current value used for displaying an image on the LED signboard based on a current sensor;
determining, by the controller, whether to smooth the current based on the current value; and
Comprising the step of the controller outputting the image on the LED signboard based on the smoothing current value determined based on the current smoothing,
The current smoothing is performed based on one smoothing type among a plurality of smoothing types,
The plurality of smoothing types are divided based on whether the current value is controlled in proportion to a change in the current value,
The plurality of smoothing types include smoothing type 1, smoothing type 2, and smoothing type 3,
The smoothing type 1 is a current smoothing type that reduces the current value in proportion to a change in the current value,
The smoothing type 2 is a smoothing type that reduces the current value using a fixed value that is partially proportional to and partially non-proportional to the change in the current value, and the non-proportional fixed value is based on a smoothing threshold is determined by
The smoothing type 3 is not proportional to the change in the current value, but is a smoothing type in which the current value is controlled to the same value according to a set threshold. The method of claim 1,
The smoothing type is determined based on the current gradient, the external environment, and the required amount of power consumption reduction,
The smoothing type 1 and the smoothing type 2 perform the current smoothing in consideration of the current gradient for each current change measurement section,
The current smoothing method is characterized in that a current change measurement section is set, and is performed in consideration of a current gradient and an absolute current value measured in the current change measuring section. 3. The method of claim 2,
The one smoothing type is determined in consideration of the current gradient of the current above the set threshold used in the display of the LED signboard,
The smoothing type 1 is used when the current gradient is greater than or equal to a first threshold gradient,
The smoothing type 2 is used when the current gradient is greater than or equal to the second threshold gradient and less than the first threshold gradient,
The smoothing type 3 is used when the current gradient is less than the second threshold gradient,
The first threshold gradient and the second threshold gradient are small values in the order,
The control unit divides the image type into a first image type and a second image type based on the current gradient,
The control unit sets the set threshold differently for each image type,
The control unit uses the smoothing type 1, the smoothing type 2, and the smoothing type 3 for the first image type,
The control unit uses only the smoothing type 3 for the second image type,
The first image type is a video,
The second image type is a still image. LED (light emitting diode) signage that performs power consumption management,
a current sensor for sensing a current value used for displaying an image on the LED signboard; and
and a controller implemented to determine whether to smooth the current based on the current value and output the image on the LED signboard based on the smoothing current value determined based on the current smoothing,
The current smoothing is performed based on one smoothing type among a plurality of smoothing types,
The plurality of smoothing types are divided based on whether the current value is controlled in proportion to a change in the current value,
The plurality of smoothing types include smoothing type 1, smoothing type 2, and smoothing type 3,
The smoothing type 1 is a current smoothing type that reduces the current value in proportion to a change in the current value,
The smoothing type 2 is a smoothing type that reduces the current value using a fixed value that is partially proportional to and partially non-proportional to the change in the current value, and the non-proportional fixed value is based on a smoothing threshold is determined by
The smoothing type 3 is not proportional to the change in the current value, and is a smoothing type that controls the current value to the same value according to a set threshold. 5. The method of claim 4,
The smoothing type is determined based on the current gradient, the external environment, and the required amount of power consumption reduction,
The smoothing type 1 and the smoothing type 2 perform the current smoothing in consideration of the current gradient for each current change measurement section,
The current smoothing is LED signage, characterized in that the current change measurement section is set, and is performed in consideration of the current gradient and the absolute current value measured in the current change measuring section. 6. The method of claim 5,
The one smoothing type is determined in consideration of the current gradient of the current above the set threshold used in the display of the LED signboard,
The smoothing type 1 is used when the current gradient is greater than or equal to a first threshold gradient,
The smoothing type 2 is used when the current gradient is greater than or equal to the second threshold gradient and less than the first threshold gradient,
The smoothing type 3 is used when the current gradient is less than the second threshold gradient,
The first threshold gradient and the second threshold gradient are small values in the order,
The control unit divides the image type into a first image type and a second image type based on the current gradient,
The control unit sets the set threshold differently for each image type,
The control unit uses the smoothing type 1, the smoothing type 2, and the smoothing type 3 for the first image type,
The control unit uses only the smoothing type 3 for the second image type,
The first image type is a video,
The second image type is an LED sign, characterized in that the still image.

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