KR102474187B1 - Standy power saving type led signage - Google Patents

Abstract

The present invention relates to a standby power saving type LED electronic display board comprising an extremely low power consumption detection circuit that is very simple and consumes low power, to recognize unlit LED panels and generate a standby power cut-off signal for cutting off standby power with respect to idle LED panels on a panel-by-panel basis, thereby enabling standby power cut-off with low cost and high efficiency. A standby power saving type LED electronic display board comprises: an LED electronic display board consisting of a plurality of LED panels; a plurality of drive ICs which respectively drive the LED panels; a timing generator which provides signals for driving the LED panels to the drive ICs; a signal line which provides RGB data signals for each unit pixel of the LED panels to each of the drive ICs and provides a driving clock and address designation signals for the LED panels to the timing generator; and an extremely low power consumption detection unit which is installed corresponding to each of the LED panels, detects the presence or absence of the RGB data signals for the LED panels, and as a result of the detection, when the RGB data signals are not present, generates a standby power cut-off signal for cutting off supply of power to the LED panels.

Description

Standby power saving type LED signboard {STANDY POWER SAVING TYPE LED SIGNAGE}

The present invention relates to a standby power saving type LED display board capable of detecting an LED panel that is not normally lit in a low-power type display board composed of a plurality of LED panels and blocking standby power for idle LED panels on a panel basis.

In general, an electronic display board is a device for displaying text, pictures, videos, etc. by arranging optical display means in a matrix form, and is mainly used in stadiums, outdoor signboards, traffic information status boards, and the like. In the past, the unit display unit of the electronic signboard was composed of a light bulb or a fluorescent lamp, but in recent years, most electronic signboards are composed of LEDs as unit pixels.

1 is a block diagram illustrating the basic configuration of a general LED display board. Referring to FIG. 1 , the LED display board 10 constitutes one display board by combining a plurality of LED panels. For example, LED panels are combined in a matrix form, and a plurality of drive ICs 20 are connected to each LED panel. The drive IC 20 is a device for driving a corresponding LED panel, and the timing generator 30 sends signals for driving the LED panel to the drive IC 20 according to clock and data signals provided through the signal line 40. device that provides For example, when the timing generator 30 applies a signal designating a specific unit pixel of a specific LED panel, the drive IC 20 turns on the corresponding unit pixel in response to the RGB signal.

Among the LED signboards, the signboards displaying moving images are applied with valid signals to most of the LED panels during operation. However, there are some LED panels that do not light up on electronic signboards that mainly express messages. For example, in an electronic display board that guides traffic conditions, when a guide message is short, some panels may remain unlit for a long time. At this time, standby power is always supplied to the unlit panel and the drive IC for driving the panel, causing unnecessary waste of power.

Attempts have been made to operate LED display boards with low power and to minimize standby power consumption. Korean Patent No. 10-2015635 "High Efficiency Power-Saving LED Display Board that Blocks Standby Power" and Korean Patent No. 10-2015636 "System that cuts off standby power by extracting no-load LEDs" are driven according to the difference in brightness of LED colors. It proposes a way to reduce power consumption by setting the time differently. Korean Patent Registration No. 10-1035026 "Power-saving LED display board using standby power control" controls the switching signal of the SMPS (Switching Mode Power Supply) that supplies power to the LED panel and panel driver to provide power in standby mode operation. Suggests a way to reduce standby power by blocking

However, the conventional LED display board control method has a problem in performing power monitoring on the entire system of the display board, for example, an image source, a video control device, an LED module, and a power supply. In addition, as an intelligent image analysis program analyzes the images to be displayed on the entire screen and controls the SMPS of the corresponding screen portion on/off, a considerable number of additional devices are required. That is, the conventional LED display board requires complex facilities such as a power monitoring device and an image analysis program for low-power design, and there is a problem in that the existing standardized system needs to be changed considerably. Furthermore, there is a problem that significant power consumption is made in the added devices.

Republic of Korea Patent No. 10-2015635 Republic of Korea Patent No. 10-2015636 Republic of Korea Patent No. 10-1035026

The present invention configures a very simple and low-power consumption detection circuit to recognize unlit LED panels and generates a standby power blocking signal that blocks standby power for idle LED panels on a panel-by-panel basis, at low cost and high efficiency. Its purpose is to provide a standby power saving LED display board that can block standby power.

A standby power saving type LED signboard according to an embodiment of the present invention includes an LED signboard composed of a plurality of LED panels; a plurality of drive ICs respectively driving the LED panels; a timing generator providing a signal for driving the LED panel to the drive IC; a signal line for providing RGB data signals for each unit pixel of the LED panel to each of the drive ICs and providing a drive clock and an address designation signal for the LED panel to the timing generator; and standby power installed to correspond to each of the LED panels, detecting the presence or absence of the RGB data signal for the LED panel, and cutting off power supply to the LED panel when the RGB data signal does not exist as a result of the detection. It includes a minimum power consumption detector that generates a cutoff signal.

In the standby power saving type LED display board according to another embodiment of the present invention, the minimum power consumption detection unit includes a startup logic unit that generates a startup signal (ME) when the addressing signal indicates its own LED panel, and the startup signal (ME) and includes a precision sensor that detects the presence or absence of the RGB data signal.

In the standby power saving type LED display board according to another embodiment of the present invention, the starting logic unit includes a first counter for counting the number of unit pixels of the LED panel in synchronization with the driving clock, and a first counter for counting the number of the LED panel. 2 counters, and a comparator that compares the output of the second counter and the addressing signal and generates the start signal ME when the comparison results match.

In the standby power saving type LED display board according to another embodiment of the present invention, the precision sensor includes an operation signal detector for detecting whether one of the driving clock and the RGB data signal exists together and outputting a valid operation signal; and a standby power blocking signal generator for generating the standby power blocking signal when a valid operation signal is not generated.

In the standby power saving type LED display board according to another embodiment of the present invention, the operation signal detector includes a first AND gate for receiving the R data signal and the driving clock, performing a AND operation, and outputting the R data signal and the driving clock; A second AND gate that receives a driving clock, performs a AND operation, and outputs a AND gate; a third AND gate that receives the B data signal and the driving clock, performs a AND operation, and outputs the AND gate; and a first OR gate that receives an output of the gate and the third AND gate, performs a logical sum operation, and outputs the valid operation signal.

In the standby power saving type LED display board according to another embodiment of the present invention, the standby power blocking signal generating unit counts a state in which the output of the operation signal detection unit is at a high level, and the startup signal (ME) is reset when the low level. It includes an operation signal counter and a latch that maintains the output of the operation signal counter at a high level after the output of the operation signal counter is generated at a high level and is reset when the start signal ME is at a low level.

In the standby power saving type LED display board according to another embodiment of the present invention, the latch is composed of a D-flip-flop.

In the standby power saving type LED display board according to another embodiment of the present invention, the standby power blocking signal generating unit performs a AND operation on the effective operation signal and the start signal ME and outputs the fourth operation signal to the input terminal of the operation signal counter. An AND gate and a NOT gate for applying a negative operation to the start signal ME to a reset terminal of the operation signal counter and a reset terminal of the latch are further included.

According to the standby power saving type LED display board of the present invention, a very small power consumption detection circuit is configured with C-MOS Logic IC that consumes low power to detect LED panels to which a valid operating signal is not applied on a panel basis, and to detect idle LED panels By applying a power cutoff signal that blocks the standby power of the drive IC and maintaining the standby power cutoff state until the effective operation signal resumes, the standby power for unit LED panels is managed at low power and cost, and the LED display board has the effect of being able to operate efficiently.

1 is a block diagram illustrating a general LED display board;
2 is a block diagram illustrating a standby power saving type LED display board according to the present invention;
Figure 3 is a block diagram illustrating a minimum power consumption detector of the present invention, and
4 is a block diagram illustrating a logic circuit configuration of a precision sensor in the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

Parts having similar configurations and operations are given the same reference numerals throughout the specification. In addition, the drawings accompanying the present invention are for convenience of description, and the shape and relative scale may be exaggerated or omitted.

In describing the embodiments in detail, redundant descriptions or descriptions of obvious technologies in the art are omitted. In addition, when a certain part "includes" another component in the following description, this means that it may further include components other than the described components unless otherwise stated.

In addition, terms such as "~ unit", "~ group", and "~ module" described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can In addition, when a part is said to be electrically connected to another part, this includes not only the case where it is directly connected but also the case where it is connected with another component interposed therebetween.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention.

2 is a block diagram illustrating a standby power saving type LED display board according to the present invention. Referring to FIG. 2, the standby power saving type LED signboard of the present invention includes an LED signboard 110, a drive IC 120, a timing generator 130, a signal line 140, and a very small power consumption detecting unit 150. consists of

The LED display board 110 constitutes one display board by combining a plurality of LED panels. For example, LED panels are combined in a matrix form, and a plurality of drive ICs 120 are connected to each LED panel. The drive IC 120 is a device that drives a corresponding LED panel, and the timing generator 130 sends signals for driving the LED panel to the drive IC 120 according to clock and data signals provided through the signal line 140. device that provides For example, the address generation logic 132 inherent in the timing generator 130 operates a dip switch or the like according to an address designation signal received through the signal line 140 . At this time, the drive IC 120 drives a specific pixel of the designated LED panel in response to the RGB signal according to the operation of the dip switch, and the corresponding pixel is lit in a specific color.

Here, the standby power saving type LED display board of the present invention includes a very small power consumption detector 150 . The minimum power consumption detector 150 is installed corresponding to each LED panel. The minimum power consumption detection unit 150 detects the presence or absence of an RGB data signal for the LED panel, and if the RGB data signal does not exist as a result of the detection, a standby power cutoff signal (SS) for cutting off the power supply to the LED panel causes

In the present invention, the minimum power consumption detection unit 150 is composed of C-MOS Logic ICs such as counters, comparators, logic gates, and D-flip-flop latches. The standby power cut-off signal (SS) is a signal transmitted to a switch (not shown) that switches power supply to the LED panel, and is a signal that turns on the power supply to the LED panel when it is at a high level, and when it is at a low level, the LED panel It is a signal that turns off the power supply to Rho.

In the present invention, regardless of the power switch of the LED panel, power should always be supplied to the minimum power consumption detector 150. However, standby power for idle LED panels can be completely blocked. As is well known, C-MOS Logic ICs can guarantee sufficient operation even with a very low current of several uA. Therefore, a significant power saving effect can be expected compared to the continuous supply of standby power to the idle LED panel.

Figure 3 is a block diagram illustrating the ultra-low power consumption sensing unit of the present invention, Figure 4 is a block diagram illustrating the logic circuit configuration of the precision sensor in the present invention. Referring to FIGS. 3 and 4 , the configuration and operation of the minimum power consumption detector 150 will be described in detail.

Referring to FIG. 3 , the minimum power consumption detection unit 150 may include an activation logic unit as shown above the dotted line in FIG. 3 to determine whether an RGB data signal is an RGB data signal for its own LED panel. The startup logic unit generates the startup signal (ME) when the addressing signal points to its LED panel. In addition, the minimum power consumption detecting unit 150 includes a precision detector that activates according to the start signal ME, detects the presence or absence of an RGB data signal, and converts the standby power cutoff signal SS to High/Low and outputs it.

First, the startup logic unit includes a first counter 210 that counts the number of unit pixels of the LED panel in synchronization with the driving clock, a second counter 220 that counts the number of LED panels constituting the electronic display board, and a second counter ( 220) and a comparator 230 that compares the address designation signal received from the address generating logic 132 of the timing generator 130. The comparator 230 outputs the start signal ME at a Hihg level when the comparison results match.

The precision detector 300 receives the RGB data signals RD, GD, and BD and the driving clock CL from the signal line 140. Referring to FIG. 4 , the precision detector 300 includes an operation signal detector 310 and a standby power blocking signal generator 320 .

The operation signal detector 310 detects whether one of the driving clock and the RGB data signal exists together and outputs a valid operation signal. Referring to FIG. 4 , the operating signal detector 310 includes a first AND gate 311 receiving an R data signal RD and a driving clock CL, performing a AND operation on the input, and outputting the G data signal GD. A second AND gate 312 that receives and outputs the B data signal BD and the drive clock CL, performs a logical product operation, and outputs the B data signal BD and the drive clock CL, and performs a logical product operation and outputs the third AND gate ( 313) and a first OR gate 314 that receives the outputs of the first AND gate 311, the second AND gate 312, and the third AND gate 313 and performs a logical sum operation to output a valid operation signal. do.

The standby power blocking signal generator 320 outputs a standby power blocking signal at a low level when a valid operation signal is not generated (ie, when there is no RGB data signal) to completely cut off power supply to the LED panel. . Referring to FIG. 4, the standby power blocking signal generator 320 includes a fourth AND gate 321, a NOT gate 322, an operation signal counter 323, a second OR gate 324, and a latch. (325).

The fourth AND gate 321 performs a AND operation on the effective operation signal output from the operation signal detector 310 and the start signal ME, and outputs the result to the input terminal of the operation signal counter 323 . The NOT gate 322 performs a negative operation on the activation signal ME and applies it to the reset terminal of the operation signal counter 323 and the reset terminal of the latch 325 . That is, when the activation signal ME is converted from the high level to the low level, the operations of the operation signal counter 323 and the latch 325 are reset.

The operation signal counter 323 counts the state in which the output of the operation signal detector 310 is at a high level. That is, the counting value increases by one whenever the start signal ME is at a high level and any one data signal among RGB data is applied to the corresponding LED panel.

The second OR gate 324 performs a logical sum operation on the outputs of the operation signal counter 323 and outputs the result. That is, whenever the operation signal counter 323 counts, the second OR gate 324 outputs a high level.

The latch 325 is a means for outputting a standby power blocking signal SS, and maintains the output at a high level after the output of the operation signal counter 323 is generated at a high level and outputs the output. For example, latch 325 can be constructed from a C-MOS standard IC 74HC374 D-flip-flop. The latch 325 outputs the standby power blocking signal SS at a high level when a high level signal is input from the second OR gate 324 . Power is normally supplied to the LED panel. When the start signal ME drops from the high level to the low level, both the operation signal counter 323 and the latch 325 are reset.

If there is an idle LED panel in the LED display board, the precision detector 300 of the corresponding LED panel operates as follows. Even when the start signal ME is converted from the low level to the high level, when none of the RGB data signals exist, the output of the fourth AND gate 321 stays at the low level, and the operation signal counter 323 It won't produce any output. The output of the latch 325 remains at the Low level, and power supply to the LED panel is completely cut off. This standby power blocking operation continues while the RGB data signal toward the corresponding LED panel is disconnected.

If any one of the RGB data signals toward the corresponding LED panel is received through the signal line 140, a counting operation occurs in the operation signal counter 323 when the next startup signal ME is applied, and the latch 325 outputs a high level continuously. Accordingly, power supply to the LED panel is resumed, and normal operation can be performed.

The invention disclosed above is capable of various modifications within a range that does not impair the basic idea. That is, all of the above embodiments should be interpreted as illustrative and not limited. Therefore, the protection scope of the present invention should be determined according to the appended claims, not the above-described embodiments, and when the elements defined in the appended claims are replaced with equivalents, it should be regarded as belonging to the protection scope of the present invention.

110: LED display board 120: drive IC
130: timing generator 132: address generation logic
140: signal line 150: extremely small power consumption detection unit
210: first counter 220: second counter
230: comparator 300: precision detector
310: operation signal detector 311: first AND gate
312: second AND gate 313: third AND gate
314: first OR gate 320: standby power blocking signal generator
321: fourth AND gate 322: NOT gate
323: operation signal counter 324: second OR gate
325: latch

Claims (8)

LED display board composed of a plurality of LED panels;
a plurality of drive ICs respectively driving the LED panels;
a timing generator providing a signal for driving the LED panel to the drive IC;
a signal line for providing RGB data signals for each unit pixel of the LED panel to each of the drive ICs and providing a drive clock and an address designation signal for the LED panel to the timing generator; and
A startup logic unit installed to correspond to each of the LED panels and generating a startup signal ME when an address designation signal received from the address generating logic of the timing generator indicates its own LED panel; ) to detect the presence or absence of the RGB data signal for its LED panel, and generate a standby power blocking signal to cut off power supply to its LED panel when the RGB data signal does not exist as a result of the detection. Extremely low power consumption detector with precision detector
A standby power saving type LED display board comprising a.
delete According to claim 1,
The activation logic unit includes a first counter for counting the number of unit pixels of the LED panel in synchronization with the driving clock, a second counter for counting the number of LED panels, an output of the second counter and the addressing signal. A standby power saving type LED display board including a comparator that compares and generates the start signal (ME) when the comparison result matches.
According to claim 1,
The precision detector detects whether one of the driving clock and the RGB data signal exists together and outputs a valid operating signal, and generates the standby power cutoff signal when the valid operating signal is not generated. A standby power saving type LED display board including a standby power blocking signal generator.
According to claim 4,
The operation signal detector includes a first AND gate for receiving the R data signal and the driving clock, performing a logical product operation, and outputting the AND gate, and a second AND gate for receiving the G data signal and the driving clock, performing a logical product operation, and outputting the AND gate; , a third AND gate that receives the B data signal and the driving clock, performs a logical product operation, and outputs the output, receives outputs of the first AND gate, the second AND gate, and the third AND gate, performs a logical sum operation, and A standby power saving type LED display board including a first OR gate outputting a valid operating signal.
According to claim 4 or 5,
The standby power blocking signal generator counts the state in which the output of the operation signal detection unit is at a high level, and an operation signal counter that is reset when the startup signal (ME) is at a low level, and an output of the operation signal counter is generated at a high level A standby power saving type LED display board including a latch that maintains its output at a high level after being turned on and is reset when the start signal (ME) is at a low level.
According to claim 6,
The latch is a standby power saving LED display board composed of a D-flip-flop.
According to claim 6,
The standby power blocking signal generator performs a logical product operation of the valid operation signal and the startup signal ME and outputs the operation signal to the input terminal of the operation signal counter, and performs a negative operation on the startup signal ME to perform the operation. A standby power saving type LED display board further comprising a NOT gate applied to the reset terminal of the signal counter and the reset terminal of the latch.

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