Display device and control method thereof

Abstract

A display device is provided. The display device may include a plurality of light emitting diode (LED) modules and a controller, the controller being configured to obtain a plurality of image signals corresponding to the plurality of LED modules based on an input signal, and to control each of the plurality of LED modules based on the obtained plurality of image signals. The controller may be configured to delay the phases of the plurality of image signals to control the plurality of image signals to be output to the plurality of LED modules at different timings.

Description

Technical Field

[0001] Devices and methods consistent with exemplary embodiments of the present invention relate to a display device and a control method thereof, and more particularly, to a display device and a control method thereof for reducing electromagnetic interference (EMI). Background Art

[0002] Generally, EMI is generated in a process in which a controller provided in a display device transmits a clock signal and high-speed image data to an operation driver of a display module.

[0003] Specifically, conventionally, a controller outputs a plurality of clock signals and data signals simultaneously (in phase), and thus, high-frequency components generated in a high-frequency region are concentrated in a specific frequency band, thereby increasing EMI noise.

[0004] Therefore, there is a problem that the clock signal and the data signal are damaged by the EMI noise. Summary of the invention

[0005] [Technical issues]

[0006] An aspect of an embodiment is directed to provide a display device which reduces EMI noise by delaying a phase of an image signal output from a controller by each display module, and a control method thereof.

[0007] [Solution to the problem]

[0008] According to an embodiment, a display device may include a plurality of light emitting diode (LED) modules and a controller, wherein the controller is configured to obtain a plurality of image signals corresponding to the plurality of LED modules based on an input signal, and control each of the plurality of LED modules based on the obtained plurality of image signals. The controller may be configured to delay the phases of the plurality of image signals to control the plurality of image signals to be output to the plurality of LED modules at different timings.

[0009] The controller may be configured to sequentially delay phases of the plurality of image signals, and a phase difference between a first image signal output among the plurality of image signals and a last image signal output among the plurality of image signals is within a time interval corresponding to one frame.

[0010] The plurality of image signals may include at least one of a clock signal and a data signal.

[0011] The phase difference between the plurality of image signals may be obtained based on a time corresponding to one frame and the number of the plurality of LED modules.

[0012] The controller may be further configured to sequentially delay phases of the plurality of image signals by a predetermined time based on an arrangement state of the plurality of LED modules.

[0013] The controller may be further configured to transmit a first image signal to a first LED module among the plurality of LED modules, and transmit a second image signal delayed by a predetermined time from the first image signal to a second LED module disposed at a maximum distance from the first LED module.

[0014] A plurality of LED modules may include a plurality of micro LED elements.

[0015] According to another embodiment, a display system may include: a display device including a plurality of display modules including a plurality of LED modules, and a plurality of controllers connected to the plurality of display modules; and an image processing device configured to obtain a plurality of image signals corresponding to the plurality of display modules by processing an input image signal, and to send the obtained signals to the plurality of controllers. Each of the plurality of controllers may be configured to receive a plurality of image signals corresponding to each of the plurality of LED modules from the image processing device, and to control each of the plurality of LED modules based on the received plurality of image signals.

[0016] Each of the plurality of LED modules may include a plurality of micro LED elements, and the plurality of LED modules may be connected to form at least one of the plurality of display modules.

[0017] According to another embodiment, a control method for a display device may include obtaining multiple image signals corresponding to multiple LED modules based on an input signal, and controlling each of the multiple LED modules based on the obtained multiple image signals, wherein the control includes delaying the phase of the multiple image signals to control the multiple image signals to be output to the multiple LED modules at different timings.

[0018] The controlling may further include sequentially delaying phases of the plurality of image signals, and a phase difference between a first image signal outputted from among the plurality of image signals and a last image signal outputted from among the plurality of image signals is within a time interval corresponding to one frame.

[0019] The plurality of image signals may include at least one of a clock signal and a data signal.

[0020] The phase difference between the plurality of image signals may be obtained based on a time corresponding to one frame and the number of the plurality of LED modules.

[0021] The controlling may further include sequentially delaying phases of the plurality of image signals by a predetermined time based on an arrangement state of the plurality of LED modules.

[0022] The controlling may further include transmitting a first image signal to a first LED module among the plurality of LED modules, and transmitting a second image signal delayed by a predetermined time from the first image signal to a second LED module disposed at a maximum distance from the first LED module.

[0023] A plurality of LED modules may include a plurality of micro LED elements.

[0024] [Advantageous Effects of the Invention]

[0025] According to the various embodiments described above, when the controller of the display device transmits an image signal to the display module, by outputting the image signal to each display module at different timings, peaks in the frequency region of the image signal can be dispersed, thereby reducing EMI noise signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or other aspects of the present invention will become more apparent by describing certain exemplary embodiments of the present invention with reference to the accompanying drawings, in which:

[0027] Figure 1 is a schematic diagram showing a configuration of a display device according to an embodiment;

[0028] Figure 2 is a block diagram showing a configuration of a display device according to an embodiment;

[0029] Figure 3 is a block diagram showing a configuration of a display system according to an embodiment;

[0030] Figure 4 is a schematic diagram showing phase delays of a plurality of image signals based on an arrangement state of a plurality of LED modules according to an embodiment;

[0031] Figure 5 is a schematic diagram showing phase delay according to an embodiment

[0032] Figure 6 is a flowchart for explaining a method for controlling a display device according to an embodiment. DETAILED DESCRIPTION

[0033] Certain exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0034] Considering the configuration and functions of the present invention, the terms used in the present invention are general terms that are currently widely used, but may be different according to the intention of those skilled in the art, precedents, the emergence of new technologies, etc. In addition, in specific cases, terms may be arbitrarily selected. Therefore, the terms used in the present disclosure do not have to be interpreted as simple names of terms, but are defined based on the meaning of the terms and the overall context of the present disclosure.

[0035] The example embodiments may vary and may be provided in different example embodiments. Various example embodiments will be described with reference to the accompanying drawings. However, this does not necessarily limit the scope of the example embodiments to specific embodiments. On the contrary, modifications, equivalents, and substitutions included in the disclosed concepts and technical scope of this specification may be adopted. When describing an exemplary embodiment, if it is determined that a specific description of a known technology obscures the main points of the present invention, the specific description may be omitted.

[0036] Terms such as "first", "second", etc. may be used to describe various elements, but these elements should not be limited by these terms. The terms used herein are intended only to describe specific example embodiments rather than to limit the scope of the present disclosure.

[0037] Singular forms include plural forms unless the context clearly indicates otherwise. In the present invention, the terms "include" and "comprise" indicate the presence of features, numbers, steps, operations, components, elements or combinations thereof written in the specification, but do not exclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, elements or combinations thereof.

[0038] The expression “at least one of A and B” may mean “A” or “B” or one of “A and B”.

[0039] In the present invention, a "module" or "unit" may perform at least one function or operation and may be implemented by hardware or software or a combination of hardware and software. In addition, multiple "modules" or multiple "units" may be integrated into at least one module, and may be at least one processor other than a "module" or "unit" that should be implemented in specific hardware.

[0040] The exemplary embodiments of the present invention will be described in more detail below in a manner that can be understood by those of ordinary skill in the art. However, the exemplary embodiments can be implemented in a variety of different configurations and are not limited to the description provided herein. In addition, well-known functions or configurations may not be described in detail. Similar numbers refer to similar parts throughout the specification.

[0041] Figure 1 is a schematic diagram showing a configuration of a display device according to an embodiment.

[0042] refer to Figure 1, the display device 100 according to the embodiment can be implemented in the form that multiple LED modules 110-1, 110-2, 110-3, 110-4, ... 110-n can be physically connected. Here, each of the multiple LED modules 110-1, 110-2, 110-3, 110-4, ... 110-n may include multiple pixels that can be arranged in a matrix form. Specifically, each of the multiple LED modules 110-1, 110-2, 110-3, 110-4, ... 110-n may include multiple LED elements. For example, the LED module can be implemented as an LED, a micro LED, an organic LED (OLED), or an active matrix OLED (AMOLED).

[0043] like Figure 1 As shown, a plurality of LED modules 110-1, 110-2, 110-3, 110-4, ... 110-n may be physically connected to form one display module 110. Hereinafter, one display module 110 in which a plurality of LED modules 110-1, 110-2, 110-3, 110-4, ... 110-n are connected together will be referred to as a display module or LED cabinet.

[0044] The display device 100 may transmit an image signal to each of a plurality of LED modules 110-1, 110-2, 110-3, 110-4, ... 110-n to display an image, and various exemplary embodiments for reducing EMI generated in the process of transmitting an image signal to each LED module will be described in detail with reference to corresponding drawings.

[0045] Figure 2 is a block diagram showing a configuration of a display device according to an embodiment.

[0046] The display module 110 may include a plurality of LED modules 110-1, ..., 110-n. Here, each of the plurality of LED modules may include a plurality of pixels, which may be arranged in the form of a matrix. Specifically, each of the plurality of LED modules 110-1, ..., 110-n may be a module including a plurality of LED elements. According to one embodiment, the LED element may be implemented as an RGB LED, and the RGB LED may include all red LEDs, green LEDs, and blue LEDs. In addition, the LED element may be implemented as a micro-LED. Here, the micro-LED is an LED having a size of 5 to 100 microns, and is a very small light-emitting device that emits light by itself without a color filter.

[0047] The controller 120 controls an operation of transmitting an image signal to the display module 110 .

[0048] The controller 120 according to the embodiment may receive an image and may be implemented as a time controller (TCON) that may receive image information and transmit the image information to a driving module of an LED module.

[0049] The controller 120 may obtain a plurality of image signals corresponding to the plurality of LED modules 110-1, ..., 110-n based on an input signal. Here, the input signal may be a signal about input image information. For example, if the display device 100 is implemented as a cabinet to which a plurality of LED modules are connected, the input signal may be received from a processor. Alternatively, if the display device 100 is implemented as a TV, the input signal may be received from another processor (e.g., a main CPU).

[0050] The controller 120 may control the LED driving module to apply a driving voltage or a driving current so as to drive each LED pixel constituting the LED module. In addition, the LED driving module may display an image corresponding to the image signal on a display screen. The LED driving module may be implemented as an LED driver.

[0051] In addition, the image signal may be a signal including at least one of a clock signal and a data signal. In other words, the controller 120 may obtain a clock signal and a data signal corresponding to each of the plurality of LED modules 110-1, ..., 110-n based on the input signal.

[0052] Here, the clock signal is a signal related to time information for controlling the timing of displaying an image corresponding to the data signal, and can be output in the form of a spherical wave. The data signal can be a signal including data about an image to be displayed on the display device 100. For example, the data signal can include pixel values, luminance information, etc.

[0053] The controller 120 may control each of the plurality of LED modules based on the obtained plurality of image signals.

[0054] The controller 120 may send a clock signal and a data signal to a driving module of each of the plurality of LED modules 110-1, ..., 110-n. Specifically, the controller 120 may send a clock signal to each of the plurality of LED modules 110-1, ..., 110-n through a clock signal transmission wiring and may send a data signal to each of the plurality of LED modules 110-1, ..., 110-n through a data transmission wiring. In other words, the controller 120 may send a clock signal and a data signal to the plurality of LED modules 110-1, ..., 110-n through separate wirings.

[0055] However, the present invention is not limited to this, and a clock embedding method for sending a clock signal and a data signal on a single transmission line, or a method in which a transmission line for sending a clock signal is not required since only a data signal is encoded and sent, and a clock signal that can be obtained from the encoded data can be used.

[0056] At the same time, the controller 120 can send a clock signal and a data signal to the plurality of LED modules 110-1, ..., 110-n at the same time. In other words, the controller 120 can send a data signal together with a clock signal to the plurality of LED modules 110-1, ..., 110-n. However, this is just an example, and the processor 120 can send either of the two signals first.

[0057] The controller 120 may sequentially delay phases of the plurality of image signals to control the plurality of image signals to be output at different timings by the plurality of LED modules 110 - 1 , . . . , 110 - n.

[0058] According to one embodiment, the controller 120 may sequentially delay the phase of the image signal to be sent to each of the plurality of LED modules 110-1, ..., 110-n by a predetermined time. For example, in the case of a display module formed by three LED modules, the controller 120 may output a first image signal to the first LED module, a second image signal that may be delayed by a predetermined time to the second LED module, and a third image signal that may be delayed by a predetermined time to the third LED module. Here, the predetermined time for the second image signal and the predetermined time for the third image signal may be the same or different. In this way, the controller 120 may output a plurality of image signals to the plurality of LED modules at different timings, respectively.

[0059] Here, the predetermined time, that is, the phase difference between the plurality of image signals, may be obtained based on the time corresponding to one frame and the number of the plurality of LED modules. Specifically, the phase difference between the plurality of image signals may be a value calculated by dividing the time corresponding to one frame by the number of the plurality of LED modules. For example, if the time corresponding to one frame is 30ns, and there are three LED modules forming the display module 110, the predetermined time may be 30ns / 3, that is, 10ns. In other words, the controller 120 may send the first image signal to the first LED module and send the second image signal to the second LED module after 10ns.

[0060] Therefore, the controller 120 may output the image signal to each LED module at a different time, and thus a rising edge in a frequency region due to transmission of the image signal may be dispersed to the maximum, thereby reducing EMI.

[0061] However, the present disclosure is not limited thereto, and the predetermined time may be one of values ​​calculated by dividing a time corresponding to one frame by the number of the plurality of LED modules 110 - 1 , . . . , 110 - n.

[0062] According to one embodiment, the controller 120 may delay the phases of the plurality of image signals by a predetermined time based on the arrangement states of the plurality of LED modules 110-1, ..., 110-n, which will refer to Figure 4 Give a description.

[0063] Figure 4 is a schematic diagram illustrating phase delays of a plurality of image signals based on an arrangement state of a plurality of LED modules according to an embodiment.

[0064] exist Figure 4 In FIG. 1 , it is assumed that six LED modules form the display module 110. In addition, Figure 4 As shown, the six LED modules are given Arabic numerals to facilitate the description of the sequence of phase delay. For example, Figure 4 The "1" in the figure represents the first LED module, the "2" represents the second LED module, and so on.

[0065] The controller 120 may delay the phase of the image signal to each LED module in the order of 1, 2, 3, 4, 5, and 6. For example, if the predetermined time corresponding to the phase difference between the plurality of image signals is 10 ns, the controller 120 may send the first image signal to the first LED module, and send the second image signal to the second LED module 10 ns later. When the phase is delayed in this manner, the time difference between the time when the first image signal is sent and the time when the sixth image signal is sent may be 50 ns.

[0066] According to another embodiment, the controller 120 may transmit a first image signal to a first LED module from among a plurality of LED modules, and transmit a second image signal which may be delayed by a predetermined time compared with the first image signal to a module arranged at a maximum distance from the first LED module.

[0067] For example, refer to Figure 4, the controller 120 may send a first image signal to the first LED module, and send a second image signal that may be delayed by a predetermined time of 10ns to the sixth LED module disposed at the maximum distance from the first LED module. Subsequently, the controller 120 may send a third image signal that may be delayed by another 10ns to the second LED module disposed at the maximum distance from the sixth module other than the first LED module. In other words, the controller 120 may send a delayed image signal by sending an image signal to one LED module, and send the next image signal that may be delayed by a predetermined time to another LED module disposed at the maximum distance relative to the corresponding LED module.

[0068] Since the image signal is transmitted based on the maximum distance, the peak value of the image signal in the frequency region can be further dispersed. Therefore, in the case where the image signal is transmitted based on the maximum distance from one display module to another display module, the degree of reducing EMI noise can be relatively greater than the case where the image signal is sequentially transmitted to adjacent LED modules.

[0069] However, the present disclosure is not limited to the above-mentioned embodiments, and the controller 120 may be configured as follows: Figure 4 The image signal is transmitted in the order of the even-numbered and odd-numbered LED modules. For example, the transmission order may be 1, 3, 5, 2, 4, and 6 or 2, 4, 6, 1, 3, and 6, or the image signal may be transmitted in any order. Figure 4 In the embodiment, it may be assumed that six LED modules form the display module 110, but this is just an example.

[0070] The controller 120 may sequentially delay the phases of the plurality of image signals. For example, a phase difference between a first image signal among the plurality of image signals and a last image signal among the plurality of image signals may fall within a time interval corresponding to a single frame.

[0071] In other words, the controller 120 may output the last image signal of the plurality of image signals within a time interval corresponding to a single frame. If the last output image signal exceeds the time corresponding to one frame, there may be a problem because the frame corresponding to the image signal may overlap with the next frame on the display screen. Therefore, the last image signal of the plurality of image signals to be output should be output within a time interval corresponding to one frame.

[0072] Meanwhile, the plurality of LED modules 110-1, ..., 110-n may be modules including a plurality of micro LED elements. Here, the micro LED may be a micro LED with a size of 10-100 μm, which is about one tenth the length of a normal LED chip, and thus about one hundredth the size of a normal LED chip.

[0073] Figure 3 is a block diagram showing a configuration of a display system according to an embodiment.

[0074] The display system 1000 may include a display device 200 and an image processing device 300 .

[0075] The display device 200 includes a plurality of display modules 210, a plurality of controllers 220, and a display driver 230 for driving the plurality of display modules. Figure 3 The display device 200 in FIG. 1 is a modular display device to which a plurality of modules can be connected. Figure 2 Discussed Figure 3 components.

[0076] The plurality of display modules 210 may be configured such that each display module including a plurality of LED modules may be connected to each other.

[0077] Therefore, the display device including the plurality of display modules 210 may be implemented as a large screen display (LFD) or the like, and may be used as an outdoor display device such as an electronic signage.

[0078] The plurality of controllers 220 may control the plurality of display modules 210 and the display driver 230. Specifically, the plurality of controllers 220 may transmit an image signal corresponding to each LED module to the driving modules 230-1, ..., 230-n.

[0079] For each of the display modules 210 - 1 , . . . , 210 - n , there may be each of a plurality of controllers 220 - 1 , . . . , 220 - n .

[0080] Each of the plurality of controllers 220 may control the plurality of LED modules by transmitting an image signal corresponding to the plurality of LED modules included in the corresponding display module 210 - 1 , . . . , 210 - n to each LED module based on the received signal so that a corresponding image may be displayed.

[0081] Specifically, the plurality of controllers 220 may sequentially delay the phases of the plurality of image signals so that the plurality of image signals may be output to the plurality of LED modules 110 - 1 , . . . , 110 - n at different timings.

[0082] The display driver 230 drives the plurality of display modules 210 under the control of the controller 220. For example, the display driver 230 may drive each LED pixel by applying a driving voltage or a driving current so as to drive each self-luminous lighting element, such as an LED pixel, constituting the plurality of display modules 210 under the control of the controller 220.

[0083] The display driver 230 includes a plurality of LED driving modules 230-1, ..., 230-n connected to each of the plurality of display modules 210. The plurality of driving modules 230-1, ..., 230-n may transmit image signals received from the plurality of controllers 220 to each LED module so as to display an image corresponding to the image signal on a screen of the display. Here, the LED driving module may be implemented as an LED driver.

[0084] In addition, the plurality of LED driving modules 230-1, ..., 230-n provide driving currents to the plurality of display modules 210 to correspond to each image signal output from the controller 220, and drive the plurality of modules 210. Specifically, the plurality of LED driving modules 230-1, ..., 230-n may output driving currents supplied to the plurality of display modules 110-1, ..., 110-n by adjusting supply time and intensity of the driving currents so as to correspond to the respective image signals output from the controller 220.

[0085] Each of the plurality of LED driving modules 230-1, ..., 230-n may have a power supply for supplying power. The power supply may be hardware that converts alternating current into direct current so that the current can be stably used in each of the plurality of display modules 210, thereby appropriately supplying current to each system. The power supply may mainly include an input electromagnetic interference filter part, an AC-DC rectifier part, a DC-DC switch conversion part, an output filter, and an output part.

[0086] The image signals sent from the plurality of controllers 220 at different timings may be stored in a buffer connected to the plurality of LED driving modules 230-1, ..., 230-n. Subsequently, each of the plurality of LED driving modules 230-1, ..., 230-n may simultaneously output a frame corresponding to the received image signal to the display screen. In other words, the image signal may be stored in the buffer, so that even if the controller 120 sends the image signal to each of the plurality of LED modules 110-1, ..., 110-n at different timings, the image corresponding to the image signal may be simultaneously displayed by the display device 100.

[0087] Here, the power supply may be implemented as a switch mode power supply (SMPS), for example. An SMPS is a DC regulated power supply device that stabilizes output by controlling the on-off time ratio of a semiconductor switching element, and may be used to drive each of the plurality of display modules 210 because it may be efficient, small, and lightweight.

[0088] However, according to another embodiment, the display driver 230 may be implemented as a single driving module that may respectively drive a plurality of SMPSs to supply power to each of the plurality of display modules 210 .

[0089] The image processing apparatus 300 may include an interface 310, a storage 320, and a processor 330. Here, the image processing apparatus 300 may be implemented as a transmission box, a control box, a set-top box, etc. that processes an input image signal and provides the processed image signal to the display apparatus 200.

[0090] The interface 310 may be connected to the display device 200. Specifically, the interface 310 may be connected to the display device 200 via a cable connected to a port. Here, the cable may be a high-definition multimedia interface (HDMI) cable. However, this is just an example, and the cable may be a digital video interface (DVI) cable, a low voltage differential signal (LVDS) cable, or an optical cable.

[0091] In addition, the interface 310 may be connected to the display device 200 via wireless communication. The interface 310 may include a Wi-Fi chip, a Bluetooth chip, a wireless communication chip, and the like.

[0092] The storage 320 may store various data required for the operation of the image processing apparatus 300. Specifically, the storage 320 may store image data received from an external device. Here, the external device may be a server, a set-top box, a USB storage, a PC, a smart phone, and the like.

[0093] The storage 320 can be implemented as a non-volatile memory, a volatile memory, a hard disk drive (HDD) or a solid-state drive (SSD), a memory card installed in the image processing device 300 (e.g., a micro-SD card, a USB memory, etc.), or an external memory connectable to an external input port (e.g., a USB memory, etc.).

[0094] The processor 330 may control the overall operation of the image processing apparatus 300 .

[0095] Here, the processor 330 may include one or more of a central processing unit (CPU), a controller, an application processor (AP), a communication processor (CP), and an ARM processor.

[0096] In addition, the processor 330 may include a graphics processing unit for processing graphics corresponding to an image. The processor 330 may be implemented as a system on chip (SoC) including a core and a GPU. The processor 330 may include a single core, a dual core, a triple core, a quad core, and multiple cores thereof.

[0097] The processor 330 according to an embodiment may transmit an image input from an external device to the display device 200 through the interface 310. Specifically, the processor 330 may obtain a signal corresponding to each of the plurality of display modules 210 by processing the input image, and provide the obtained signal to the plurality of controllers 220. Subsequently, the controller 220 may display an image corresponding to the signal on a display screen by controlling the plurality of display modules 210 and the display driver 230.

[0098] The image processing device 300 is described as a device separate from the display device 200 , but the image processing device 300 may be included in the display device 200 and implemented as a single device.

[0099] Figure 5 is a schematic diagram illustrating phase delay according to an embodiment.

[0100] exist Figure 5 In the embodiment, it is assumed that six LED modules form the display module 110. However, the embodiments of the present invention are not limited thereto.

[0101] Specifically, Figure 5 (a) is a diagram showing an image signal in a frequency region before phase delay.

[0102] Reference Figure 5 (a), the controller 120 may output each of the first to sixth image signals to the first to sixth modules at the same time, respectively. In other words, when the controller 120 outputs each of the plurality of image signals to the first to sixth modules without delaying the phases of the plurality of image signals, peaks in the frequency region may overlap and EMI may increase.

[0103] Figure 5 (b) is a diagram showing an image signal in a frequency region after a phase delay.

[0104] Figure 5 (b) shows that the controller 120 can sequentially delay the phases of the plurality of image signals to output the plurality of image signals at different timings in the frequency region.

[0105] The controller 120 may delay a phase of an image signal to be sequentially transmitted to each of the plurality of LED modules 110-1, ..., 110-n by a predetermined time. In addition, the controller 120 may continuously delay the plurality of image signals uniformly by a predetermined time.

[0106] Here, the predetermined time may be referred to as t1. For example, the controller 120 may delay the second image signal so that the time when the image signal is output to the first LED module and the second LED module differs by t1, and delay the third image signal so that the time when the image signal is output to the second LED module and the third LED module also differs by t1. In addition, the controller 120 may delay the image signals output to the remaining modules in the same manner.

[0107] At the same time, the controller 120 can sequentially delay the phases of the plurality of image signals, and the phase difference between the first image signal of the plurality of image signals and the last image signal of the plurality of image signals can fall within a time interval corresponding to a single frame. In other words, the controller can output the image signal that is last output within a time interval corresponding to a single frame.

[0108] Reference Figure 5 (b) The controller 120 may sequentially delay the phases of the plurality of image signals so that a phase difference t2 between an image signal outputted first and an image signal outputted last from among the plurality of image signals is within a time interval corresponding to a single frame.

[0109] According to one embodiment, the controller 120 may set the phase difference t1 between the plurality of image signals to a value calculated by dividing a time corresponding to one frame by the number of the plurality of LED modules.

[0110] For example, if the time corresponding to one frame is 60ns, and there are six LED modules forming the display module 110, the controller 120 can delay the phase of the image signal by setting the predetermined time to 10ns (calculated by dividing 60ns by 6 (60ns / 6)). In this case, t2 corresponding to the phase difference between the image signal output for the first time and the image signal output for the last time among the multiple image signals is equal to the time interval corresponding to one frame. Therefore, the rising edge in the frequency region according to the transmission of the image signal can be dispersed to the maximum extent, and EMI can be reduced. If the time interval between the first image signal and the last image signal exceeds the time corresponding to one frame, there may be a problem that the frame corresponding to the image signal overlaps with the next frame on the display screen.

[0111] Figure 6 is a flowchart for explaining a method for controlling a display device according to an embodiment.

[0112] The display device may include a step S610 of obtaining a plurality of image signals corresponding to a plurality of LED modules based on an input signal.

[0113] Here, the input signal may be a signal about input image information. In addition, the input image signal may be a signal including at least one of a clock signal and a data signal. Here, the clock signal is a signal about time information for controlling the timing of displaying an image corresponding to the data signal, and may be output in the form of a spherical wave. The data signal may be a signal including data about an image to be displayed on the display device 100. For example, the data signal may include pixel values, illumination information, etc.

[0114] The display device may include step S620 of controlling each of the plurality of LED modules based on the obtained plurality of image signals.

[0115] Specifically, the display device may control multiple image signals to be output to multiple LED modules at different timings by sequentially delaying the phases of the multiple image signals. The display device may sequentially delay the phase of an image signal to be transmitted to each of the multiple LED modules by a predetermined time.

[0116] For example, if there is a display module including three LED modules, the display device may output a first image signal to the first LED module, output a second image signal delayed by a predetermined time to the second LED module, and output a third image signal delayed by a predetermined time from the second image signal to the third LED module. Here, the predetermined time of the second image signal and the predetermined time of the third image signal may be the same or different.

[0117] The phase difference between the plurality of image signals may be obtained based on the time corresponding to one frame and the number of the plurality of LED modules. Specifically, the phase difference between the plurality of image signals may be a value calculated by dividing the time corresponding to one frame by the number of the plurality of LED modules. For example, if the time corresponding to one frame is 30ns and there are three LED modules forming a display module, the predetermined time may be 10ns (calculated by dividing 30ns by 3 (30ns / 3)). In other words, the display device may send the first image signal to the first LED module after 10ns, and send the second image signal to the second LED module.

[0118] The display device may sequentially delay phases of the plurality of image signals, and a phase difference between a first image signal of the plurality of image signals and a last image signal of the plurality of image signals may be within a time interval corresponding to one frame.

[0119] The display device may sequentially delay phases of the plurality of image signals by a predetermined time based on an arrangement state of the plurality of LED modules.

[0120] According to one embodiment, the display device may transmit the first image signal to a first LED module among a plurality of LED modules, and transmit the image signal having a delayed phase in the order of LED modules arranged at adjacent positions with respect to the first LED module.

[0121] According to another embodiment, the display device may send a first image signal to a first LED module among multiple LED modules, and send a second image signal delayed by a predetermined time compared with the first image signal to a second LED module, which is arranged at a maximum distance from the first LED module.

[0122] When the image signals are transmitted in descending order of distance, peak values ​​of the image signals may be further dispersed in the frequency region, and thus EMI may be further reduced compared to a case where the image signals are sequentially transmitted between adjacent LED modules.

[0123] However, the present disclosure is not limited to the above-described embodiments, and the display may transmit the image signal to the LED module in various ways, such as transmitting the image signal whose phase is delayed in an arbitrary order.

[0124] Here, the plurality of LED modules may be modules including a plurality of micro LED elements.

[0125] At least some of the methods according to the various embodiments described above may be implemented only by software upgrade or hardware upgrade of a display device composed of existing unit display modules and / or unit display modules.

[0126] At the same time, the various embodiments described above can be embodied in a recording medium, which can be read by a computer or a computer-like device using software, hardware or a combination thereof. In some cases, the above embodiments can be implemented as a processor itself. In software configuration, the various embodiments described in this disclosure (such as processes and functions) can be implemented as separate software modules. Each software module can perform one or more functions and operations described in this disclosure, respectively.

[0127] Meanwhile, computer instructions for executing the processing operations according to the above-mentioned various embodiments may be stored in a non-transitory readable medium. The computer instructions stored in the non-transitory readable medium may enable a specific device to execute the processing operations according to the above-mentioned various embodiments when executed by a processor.

[0128] The non-temporary readable recording medium does not refer to a medium that stores data for a short period of time, but may be a medium that stores data semi-permanently and can be read by a device. Specifically, the above-mentioned various applications or programs can be stored in non-temporary readable media such as CD, DVD, hard disk, Blu-ray disc, USB, memory card, ROM, etc.

[0129] Although the present invention has been shown and described with reference to various embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made in form and detail without departing from the spirit and scope of the present invention. These modifications should not be interpreted separately from the technical concept or prospect of the present invention.

Claims

1. A display device, comprising: a plurality of light emitting diode (LED) modules, wherein each of the plurality of LED modules comprises a plurality of LED elements arranged in a matrix form, wherein the plurality of LED modules are physically connected together and arranged to form a display module; and a controller configured to obtain a plurality of image signals corresponding to the plurality of LED modules based on an input signal, and control each of the plurality of LED modules based on the obtained plurality of image signals, The controller is configured to delay phases of the plurality of image signals to control the plurality of image signals to be output to the plurality of LED modules at different timings. wherein the controller is configured to sequentially delay the phases of the plurality of image signals by a predetermined time based on the arrangement of the plurality of LED modules, wherein the controller is configured to send a first image signal to a first LED module among the plurality of LED modules, and send a second image signal delayed by the predetermined time from the first image signal to another LED module, the another LED module being arranged at a maximum distance from the first LED module, wherein the predetermined time between the plurality of image signals is a time obtained by dividing one frame by the number of the plurality of LED modules, and Wherein, the controller sends a clock signal and a data signal to the multiple LED modules simultaneously.

2. The display device according to claim 1, wherein: The controller is configured to sequentially delay phases of the plurality of image signals, and a phase difference between a first image signal output among the plurality of image signals and a last image signal output among the plurality of image signals is within a time interval corresponding to one frame.

3. The display device according to claim 1, wherein: The plurality of image signals include at least one of a clock signal and a data signal.

4. The display device according to claim 1, wherein: The plurality of LED modules include a plurality of micro LED elements.

5. A display system comprising: A display device comprising a plurality of display modules including a plurality of LED modules and a plurality of controllers connected to the plurality of display modules; as well as an image processing device configured to obtain a plurality of image signals corresponding to the plurality of display modules by processing an input image signal, and to send the obtained signals to the plurality of controllers, wherein each of the plurality of LED modules comprises a plurality of LED elements arranged in a matrix form, wherein the plurality of LED modules are physically connected together and arranged to form a display module, wherein each of the plurality of controllers is configured to receive the plurality of image signals corresponding to each of the plurality of LED modules from the image processing device, and control each of the plurality of LED modules based on the received plurality of image signals, wherein the controller is configured to sequentially delay the phases of the plurality of image signals by a predetermined time based on the arrangement of the plurality of LED modules, wherein the controller is configured to send a first image signal to a first LED module among the plurality of LED modules, and send a second image signal delayed by the predetermined time from the first image signal to another LED module, the another LED module being arranged at a maximum distance from the first LED module, wherein the predetermined time between the plurality of image signals is a time obtained by dividing one frame by the number of the plurality of LED modules, and Each of the controllers sends a clock signal and a data signal to the plurality of LED modules simultaneously.

6. The display system according to claim 5, wherein: Each of the plurality of LED modules includes a plurality of micro LED elements, and Wherein, the plurality of LED modules are connected to form at least one of the plurality of display modules.

7. A method for controlling a display device, the method comprising: obtaining a plurality of image signals corresponding to a plurality of LED modules based on an input signal, wherein each of the plurality of LED modules includes a plurality of LED elements arranged in a matrix form; Simultaneously sending a clock signal and a data signal to the plurality of LED modules, wherein the plurality of LED modules are physically connected together and arranged to form a display module; and controlling each of the plurality of LED modules based on the obtained plurality of image signals, The controlling includes delaying the phases of the plurality of image signals to control the plurality of image signals to be output to the plurality of LED modules at different timings. wherein the controlling comprises sequentially delaying the phases of the plurality of image signals by a predetermined time based on the arrangement of the plurality of LED modules, wherein the controlling comprises sending a first image signal to a first LED module among the plurality of LED modules, and sending a second image signal delayed by the predetermined time from the first image signal to another LED module, wherein the another LED module is arranged at a maximum distance from the first LED module, The predetermined time between the plurality of image signals is a time obtained by dividing one frame by the number of the plurality of LED modules.

8. The method according to claim 7, wherein: The controlling includes sequentially delaying phases of the plurality of image signals, and a phase difference between a first image signal output among the plurality of image signals and a last image signal output among the plurality of image signals is within a time interval corresponding to one frame.

9. The method according to claim 7, wherein: The plurality of image signals include at least one of a clock signal and a data signal.

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