KR20070076053A - Open/short detecting arrapatus and method for led dot matrix module - Google Patents

Abstract

A device and a method for detecting a failure of an LED(Light Emitting Diode) dot matrix module are provided to check the operation states of the present LED and the LED dot matrix module by detecting open/short and normal states of the LEDs correspondingly to various operation modes. In an image display device(100) having at least one LED dot matrix module(104) including plural LEDs, a failure detecting device for detecting the operation state of the LED is composed of a main control unit(102) outputting data and a control signal; a driving unit(108) having general and sensing modes and driving the LED dot matrix module in order to output display information as the general or sensing mode by receiving the data and the control signal from the main control unit; and a sensing unit(110) receiving display information from the driving unit if the driving unit is operated as the sensing mode, and outputting the detected information corresponding to each open/short state to the main control unit if the abnormal open/short state is generated in at least one LED of the LED dot matrix module.

Description

Fault detection device and method thereof of light emitting diode dot matrix module {OPEN / SHORT DETECTING ARRAPATUS AND METHOD FOR LED DOT MATRIX MODULE}

1 is a block diagram showing the configuration of a video display device having a fault detection circuit according to the present invention;

FIG. 2 is a block diagram showing a configuration of an operating mode of the driving unit illustrated in FIG. 1;

3 is a block diagram showing a configuration of a first detection circuit of a driving unit according to an embodiment of the present invention;

4 is a waveform diagram illustrating outputting sensed address data for 48 channel data of an open / short controller according to an embodiment of the invention;

5 is a block diagram showing a configuration of a second detection circuit of a driving unit according to an embodiment of the present invention;

FIG. 6 is a waveform diagram for explaining switching from the dynamic mode of the driving unit shown in FIG. 2 to the open / short sensing mode; FIG.

FIG. 7 is a waveform diagram for explaining switching from the video and magnitude modes of the driver shown in FIG. 2 to the open / short sensing mode; FIG.

FIG. 8 is a waveform diagram illustrating an open / short sense state when switching in the dynamic mode of the driver shown in FIG. 2; FIG.

FIG. 9 is a waveform diagram illustrating an open / short sensing state when switching in the video and magnitude modes of the driver shown in FIG. 2; FIG.

10 is a waveform diagram for explaining sensed data transmission according to an open / short, steady state;

11 is a waveform diagram for explaining switching to a normal display state after the open / short sense mode is finished in the dynamic mode; And

FIG. 12 is a waveform diagram illustrating a transition from a video and magnitude mode to a normal display state after the open / short detection mode ends.

Explanation of symbols on the main parts of the drawings

100: video display device 102: main control unit

104: LED module 106: LED light emitting unit

108: LED dot matrix driver

110: LED dot matrix open / short detector

120: first detection circuit 140: second detection circuit

The present invention relates to an image display device, and more particularly, to an apparatus and method for detecting a failure of a light emitting pixel circuit of a light emitting diode dot matrix display.

In general, an image display device using light emitting diode dot matrix modules, for example, a display board or the like, arranges a plurality of light emitting diodes (LEDs) that are light emitting elements in a dot matrix form, and displays an image from an image source such as a remote computer. By receiving the data and selectively lighting the respective light emitting elements, information such as various characters, pictures, and images is displayed. That is, the image data transmitted from the image source is received through the control unit of the image display device, and the control unit drives and controls a plurality of LED modules by outputting corresponding data and control signals to at least one driving integrated circuit to each LED module. .

However, such an LED module frequently causes a failure due to disconnection or short circuit in each light emitting diode representing a pixel unit. Accordingly, when a failure occurs in at least one light emitting diode for maintenance of the image display device, an operator may directly check a shorted light emitting diode and replace the corresponding LED module.

As described above, in the image display apparatus using a plurality of light emitting diodes, when the reliability of the LEDs is not secured, frequent occurrences of defective LEDs and defective LEDs due to prolonged use of the LEDs are generated. However, in order to eliminate such defects, the time required for maintenance is increased by directly checking the operator and replacing the corresponding LED module, and it is difficult to accurately check the failure, thereby replacing the entire LED module, thereby increasing the maintenance cost. There is this.

SUMMARY OF THE INVENTION An object of the present invention is to provide a failure detecting apparatus and method for checking an operating state of a light emitting diode in an image processing apparatus having a light emitting diode.

Another object of the present invention is to provide a failure detecting apparatus and method for facilitating maintenance of a light emitting diode in an image processing apparatus having a light emitting diode.

It is still another object of the present invention to provide a failure detecting apparatus and method for checking an abnormality of a light emitting diode in response to various driving modes in an image processing apparatus having a light emitting diode.

In order to achieve the above objects, there is provided a failure detecting apparatus for detecting an operating state of a light emitting diode of an image display device having a plurality of light emitting diodes of the present invention. As described above, the failure detecting apparatus detects the open / short and normal states of the light emitting diodes in response to various operation modes, thereby making it possible to check the current operating states of the light emitting diodes and the LED dot matrix module.

In the image display device including at least one light emitting diode dot matrix module having a plurality of light emitting diodes according to the present invention, the failure detection device for detecting an operating state of the light emitting diode, the main control unit for outputting data and control signals Wow; A driving unit having a normal mode and a sensing mode, for driving the light emitting diode dot matrix module to receive the data and control signals from the main control unit and output display information in the normal mode or the sensing mode; When the driving unit operates in the sensing mode, when the display information is received from the driving unit and an open / short abnormality is generated in at least one light emitting diode of the LED dot matrix module, the open / short abnormality corresponds to the respective open / short abnormality. And a sensing unit for outputting sensing information to the main control unit.

In one embodiment, the driving unit; A first detection circuit configured to receive and store the data from the main control unit, receive the control signal from the main control unit, and switch to the sensing mode, and reference data, and switch from the first detection circuit to the sensing mode Outputting the stored data to the light emitting diodes, and comparing the reference data with sensed data indicating a current operating state of the light emitting diodes. When the at least one light emitting diode is generated, the open / short abnormality is generated. And a second detection circuit configured to transmit data regarding a short abnormal state to the first detection circuit, wherein the first detection circuit receives data about the open / short abnormal state to generate the open / short abnormality. The address data of the light emitting diode is transmitted to the sensing unit, and the sensing unit Transmits the sensing information to the main controller in response to the address data.

In this embodiment, the first detection circuit is provided as a digital circuit, and the second detection circuit is provided as an analog circuit.

In this embodiment, the first detection circuit; An open / short detection starter for outputting a sensing mode on signal for receiving the control signal from the main control unit and switching to a sensing mode, data buffers for receiving and storing the data from the second detection circuit, and the open / short detection And an open / short controller configured to receive the sensing mode on signal from a starter and control the second sensing circuit to detect the sensing information, and to receive the sensing information from the second detecting circuit and to transmit the sensing information to the sensing unit.

In this embodiment, the second detection circuit; First setting data for detecting a level at which the output voltage level of the light emitting diode indicates an open state from the reference voltage, a second setting for detecting a level at which the output voltage level of the light emitting diode indicates a short state A reference unit which compares data to determine an open or short operation state of the light emitting diodes, a converter that receives an external resistance value, receives the reference voltage from the reference unit, and converts the current voltage into an amount of current controlling the brightness of the light emitting diodes; An output driver that receives data driving the light emitting diodes, receives the converted current amount from the converter, and outputs data driving the light emitting diodes; and receives the sensing mode on signal from the open / short detection starter to receive the sensing mode. By And detect the operation state of the light emitting diode from the drive data outputted from the output driver by receiving address data corresponding to the light emitting diodes, and open the sensing data indicative of the detected operation state. Includes open / short detectors to send to the short controller.

In another embodiment, the driving unit; Even when the normal mode is any one of a dynamic mode, a video mode, and a magnetic mode, the controller receives the control signal from the main control unit, switches to the sensing mode, and when the sensing mode ends, switches to the sensing mode of the normal mode. Switch to the operating mode before switching.

The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited by the embodiments described below. These examples are provided to more fully explain the present invention to those skilled in the art. Therefore, the shape of the components in the drawings, etc. have been exaggerated to emphasize a more clear description.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 12.

1 is a block diagram showing the configuration of a video display device according to the present invention.

Referring to FIG. 1, the image display apparatus 100 includes an LED dot matrix main controller 102 (hereinafter referred to as a main controller), a plurality of LED modules 104 connected in a cascade manner, LED dot matrix open / short detector 110 (hereinafter referred to as open / short detector).

The main controller 102 receives data including display information from an image source (not shown) to drive and control the LED modules 104. The main controller 102 transmits a control signal to the driver 108 to detect whether the LED emitters 106 are open or short from the open / short detector 110 to the driver 108. The sensor 110 receives sensing information corresponding to the control signal, and determines a defective state of the LED light emitting unit 106. In addition, the main controller 102 is connected to a remote control device (for example, a computer, etc.) (not shown) through a network, and transmits the sensing information to the control device for maintenance.

The LED module 104 includes a plurality of light emitting diodes, each of which outputs display information such as a text or an image, and an LED light emitting unit 106 that is controlled by the main controller 102 to drive the LED light emitting unit 106. LED dot matrix driver 108 (hereinafter referred to as driver).

When the display information is output from the driver 108 of the at least one LED module 104 to the LED light emitting unit 106, the open / short detection unit 110 checks the open or short status of each LED at a predetermined time interval. As a result, detection information of the abnormally generated LED and / or the LED module 104 is output to the main controller 102.

Therefore, the video display device 100 of the present invention is a current state of the LED in the driver 108 in order to reduce the problem caused by the display of the character information or image information displayed on the LED modules due to the failure of at least one light emitting diode. That is, if the defective LED open / short, if normal checks the normal state to perform the function to inform the current state to the main control unit 102.

As shown in FIG. 2, the driving unit 108 of the image display apparatus 100 of the present invention has a dynamic mode for turning on and off the LED for simple character display in a manner for driving the LED module 104. mode 112, a video mode 114 that includes a gradation processing function for displaying an image and does not include a gamma processing function, and a magnitude mode including a gradation processing and a gamma processing function. 116). When the LED module 104 outputs a specific signal to the driver 108 to confirm the open, short or normal state of the LED from the main controller 102 during operation, regardless of the operation modes 112 to 116, the driver Open / short sense mode 118 for detecting an open, short or steady state at 108.

As described above, the video display device 100 of the present invention uses a failure detection circuit (120, 140 in FIGS. 3 and 4) in the LED dot matrix driver 108 to detect an open / short state of each LED. By providing a specific signal from the main control unit 102 to the failure detection circuit (120, 140), to detect the operation state of each LED, and transmits the detected data to the main control unit 102 to operate the LED You can check the status.

Referring to FIG. 2, the driving unit 108 selects one of a dynamic mode, a video mode, and a magnetic mode to drive the LED module 104. At this time, the main controller 102 moves from the main controller 102 to the open / short detection mode. When a specific signal is input for operation, it switches from the dynamic mode, the video mode, or the magnetic mode to the open / short detection mode so that each color data (e.g., 16 color data for each 16 * 16 dot matrix module) RED, GREEN, BLUE) to detect the operating status of each LED, and outputs the sensing data to the driver of the next stage connected by cascade or the driver of the next stage that is sequentially opened and opened / closed through the driver of the last stage. The sensing information is output to the short detector 110.

Here, the clock signal GCLKx is a clock signal for gray scale processing, data REDx, GREENx, and BLUEx are color data, and clock signal SCLKx is a clock signal for data transmission. The control signal LATCHx is a command for storing data to a memory (not shown) in the driving unit 108, and the control signal LOADx is a command for reading and outputting color data to output display information to respective LEDs. The control signal OUT_EN is a command for adjusting luminance, and data A [3: 0] represents a line address scanned in the dynamic mode, and a line for storing gradation color data in the internal video data memory in the video mode and the magnetic mode. Indicates an address. Data VDCD [1: 0] is also used to control LED dot matrix in video mode and magnitude mode, white balance, brightness, dot correction and video data memory. Control the function of each mode.

In detail, the driver 108 includes the first and second detection circuits 120 and 140 illustrated in FIGS. 3 and 5.

That is, referring to FIG. 3, the first detection circuit 120 is, for example, a digital circuit, and includes an open / short detection starter 122, an open / short controller 124, and a plurality of data buffers 126 to 130. Include. In addition, when the image display apparatus 100 is switched to the open / short detection mode, the first detection circuit 120 switches to the open / short detection mode and receives data detected by the open / short detection unit 110. It transmits to the main control unit 102.

As illustrated in FIG. 6, the first detection circuit 120 receives the specific signals SCLK, LATCH, and OUT_EN according to the operation mode, and switches to the open / short detection mode. That is, the first detection circuit 120 detects the detection signal DETECT for switching from the open / short detection starter 122 to the open / short detection mode regardless of the dynamic mode, the video mode, and the magnetic mode. Transmit to the open / short controller 124 to switch to the open / short detection mode.

Referring to FIG. 5, the second detection circuit 140 may include, for example, an analog circuit unit, a reference unit 142, a plurality of converters 144 to 148 corresponding to respective color data, A plurality of output drivers 150-154 and open / short detector 156 are included. When the second detection circuit 140 is switched to the open / short detection mode of the LED module 104, the second detection circuit 140 detects an operation state of the LED from the color data of each output channel, converts the detected state into a digital signal, and 1 is transmitted to the detection circuit 120.

The reference unit 142 sets and stores the internal reference voltage BSEL [3: 0] to detect open / short data, and stores each LED based on the voltage level of the reference voltage set value BSEL [3: 0]. Compare the set value (R2SE [2: 0]) for detecting the open level of the output stage with the set value (R1SE [2: 0]) for detecting the short level of each LED output stage and compare the open or short status of each LED. Decide

The converters 144 to 148 are provided as, for example, voltage-to-current (VI) converters to receive the resistance values Rext1, rext2, and Rext3, respectively, from an external resistor (not shown) connected to the power supply voltage terminal (not shown). The reference value is received from the reference unit 142, and the current amount for adjusting the brightness of each LED is transmitted to each output driver 150 to 154.

The output drivers 150 to 154 receive digital data CH1ON [15: 0], CH2ON [15: 0], and CH3ON [15: 0], which turn on and off the LEDs of each channel from the color data, and convert the converter 144. 148 outputs the respective channels (CH1OUT [15: 0], CH2OUT [15: 0], CH3OUT [15: 0]) to drive the LEDs according to the amount of current transmitted from ˜148.

The open / short detector 156 receives the detection mode on signal DET_ON from the open / short controller 124 of FIG. 3 to operate in the open / short detection mode, and provides an address for each LED channel. From the driving signals CH1OUT [15: 0], CH2OUT [15: 0], and CH3OUT [15: 0], which receive data DT1SE [5: 0] and output them from the respective output drivers 150 to 154. Detect the operating status of each of the LEDs. The data IND_SH and IND_OP indicating the detected state of the LED are transmitted to the open / short controller 124.

Specifically, the operation of the first and second detection circuits 120 and 140 will be described with reference to FIG. 4 and the waveform diagrams of FIGS. 6 to 12. In this embodiment, a description is made using a 16 * 16 dot matrix module.

That is, as shown in FIG. 4, the open / short controller 124 outputs a sensing mode on signal DET_ON indicating the open / short sensing mode to the second detection circuit 140 to detect the state of the LED. . At this time, the second detection circuit 140 receives the sensing mode on signal DET_ON, and each of the respective color data (for example, 16 channel data of RED, GREEN, and BLUE, respectively, in case of a 16 * 16 dot matrix module). Switch to the ready state to check the status. The open / short controller 124 then outputs address data DT1SE [5: 0] for the 48 channels of each LED to the second detection circuit 140. In response, the open / short detector 156 of the second detection circuit 140 opens data indicating the LED state of each channel, that is, data IND_SH indicating the short state and data IND_OP indicating the open state. / To the short controller 124.

Accordingly, the open short controller 124 analyzes and aggregates the sensing data IND_SH and IND_OP transmitted from the second detection circuit 140 and outputs respective LED failure states, that is, open or short states. The data buffer of each color data is changed to the data '1 (HIGH)' indicating the LED bad state or the data '0 (LOW)' indicating the LED normal state and transmitted to the main control unit 102 or the driver of the next stage. Transfer it to (DATA BUFFER # 1, DATA BUFFER # 2 and DATA BUFFER # 3) (126 ~ 130) to save. The sensing data 132, 134, and 136 stored in the data buffers 126 to 130 are driven in the next stage or the open / short detector in synchronization with a clock signal (SCLK: shift clock) input from the main controller 102. Is output to 110.

When the detection mode on signal DET_ON is transmitted from the open / short controller 124 to the open / short detector 156, the open / short detector 156 may, for example, display 48 channels of LEDs. Detects the state of the signals connected to CH1OUT [15: 0], CH2OUT [15: 0], and CH3OUT [15: 0]. As a result, the open / short detector 156 receives the address data DT1SE [5: 0] of each channel LED from the open / short controller 124, as shown in FIG. Transmit sequentially in response to (DT1SE [5: 0]). The open / short controller 124 outputs sensing data IND_SH and IND_OP indicating the open or short status of each LED in correspondence with the address data DT1SE [5: 0].

The main controller 102 according to an embodiment of the present invention determines the open / short detection mode of the driver by dividing into two cases, a dynamic mode and a video and magnitude mode.

Referring to FIG. 6, in the dynamic mode, open / short sensing is performed using the clock signal SCLK and three control signals LATCH and OUT_EN among the 14 data input signals of the driver 108 illustrated in FIG. 2. Switch to mode. That is, when the high level clock signal SCLK and the control signals LATCH and OUT_EN are simultaneously applied from the main controller 102 to the driver 108, the driver 108 switches from the dynamic mode to the open / short detection mode. .

In the video and magnitude modes, as shown in FIG. 7, four out of fourteen data input signals input from the main controller 102 to the driver 108, that is, the clock signals SCLK0 and the control signals LATCH and OUT_EN. , LOAD) is switched to the open / short detection mode, that is, the driver 108 simultaneously controls the high level clock signal SCLK0 and the low level control signals LATCH, OUT_EN, and LOAD from the main controller 102. Input, switch from video and magnitude mode to open / short detection mode.

Subsequently, referring to FIG. 8, the main controller 102 turns on the LED in order to check the operating state of the LED in the dynamic mode after the driver 108 is switched to the open / short sensing mode by the waveform of FIG. 6. The data, that is, the test data, is divided into respective color data RED, GREEN, and BLUE, and 16-bit color data is continuously input in synchronization with the clock signal SCLK. When the color data is latched, the 16 channel 48 LEDs of each of the current color data are turned on. Therefore, when the control signal OUT_EN is changed from the low level to the high level by detecting the current state of the LED by the second detection circuit 140, the sensing mode on signal DET_ON is changed to the high level so that each of the 48 channels of the LED is changed. The data of the open / short state or the normal state is checked. Then, the sensed data is stored in the data buffers 126 to 130 of the first detection circuit 120.

In this case, when a plurality of driving units 108 are connected to a cascade, the switch 108 is switched to open / short detection mode, and 16-bit LED on data for checking the operation state of the LEDs is determined by the number of driving units 108. Is applied to drive the LED.

In addition, in the video and magnitude mode, as shown in FIG. 9, after switching to the open / short detection mode, the main controller 102 sends the LED on data for checking the operation state of the LED to the driver 108. Input 16-bit test data continuously by separating each color data (RED, GREEN, BLUE). In this case, the control signal LOAD is further controlled in the video and magnitude modes by the waveform of FIG. 7. Subsequently, the following procedure of latching the color data and turning on each of the 16 channel 48 LEDs to detect the current state of the LEDs in the second detection circuit is the same as that of FIG. 8, and thus is omitted here.

In the above, the driving unit 108 is applied to driving 48 LEDs in a static manner in two divided modes.

However, when the driving unit 108 drives in a dynamic manner with a duty ratio of 1/2, 1/4, 1/8, or 1/16 rather than the static method, the driving units 108 are 96 and 192, respectively. Drive 384 or 768 LEDs. In this case, the driving unit 108 operates a scan circuit (not shown) for each horizontal line in the LED dot matrix module 104. Therefore, when the scan circuit is operated, the LED dot matrix module is composed of 16 lines. In the case of FIG. 8, the LED dot matrix module is opened for each line by using the control signal A [3: 0] for controlling the line scan. Repeat the short operation to detect the operation status of each LED.

10 is a waveform diagram illustrating a sensed data transmission according to an open / short and steady state according to an exemplary embodiment of the present invention.

Referring to FIG. 10, when the control signal OUT_EN is converted from the high level to the low level, the sixteen clock signals SCLK are output from the main controller 102 to the driver 108 and synchronized with the clock signal SCLK. The open / short detection data is transmitted to the open / short detection unit 110 through the output data (REDO, GREENO, BLUEO).

In this case, when the plurality of driving units 108 are connected by the cascade, the clock signal SCLK is output as many as the number of the driving units 108 to transmit the sensing data to the open / short sensing unit 110.

In addition, the driver with a scan circuit detects open / short data for each line and outputs the detected data for each line. In this case, the same applies regardless of the operation mode, i.e., dynamic mode, video mode, and magnitude mode.

11 and 12 are waveform diagrams for explaining switching to the general display state of the dynamic mode of the driver 108 and the video and magnitude modes.

Referring to FIG. 11, when the open / short detection mode is terminated, it is switched to the normal operation mode state to display previous text or image data. Therefore, when detecting the open / short data and transmitting the sensed data to the open / short detector 110 and then switching from the open / short sense mode to the dynamic mode, the controller 110 moves from the main controller 102 to the driver 108. By outputting the control signal OUT_EN of the level to the normal display state, the normal dynamic mode is performed.

Referring to FIG. 12, even when the open / short detection mode is terminated in the video and magnitude modes, the display device may switch to the normal operation mode to display previous text or image data. Therefore, when switching from the open / short detection mode to the video and magnitude mode, when the high level control signal OUT_EN is applied from the main control unit 102 to the driving unit 108, the display unit changes to the normal display state.

As described above, the open / short failure detection device of the LED dot matrix module according to the present invention detects the open / short and the normal state of the light emitting diodes in response to various operation modes, thereby providing the current light emitting diode and the LED dot matrix. You can check the operation status of the module.

In addition, maintenance of the video display device is easy by confirming each LED operation state of the video display device including the LED dot matrix module.

Claims (6)

A video display device comprising at least one light emitting diode dot matrix module having a plurality of light emitting diodes, the fault detection device detecting an operating state of the light emitting diodes: A main controller for outputting data and control signals; A driving unit having a normal mode and a sensing mode, for driving the light emitting diode dot matrix module to receive the data and control signals from the main control unit and output display information in the normal mode or the sensing mode; When the driving unit operates in the sensing mode, when the display information is received from the driving unit and an open / short abnormality is generated in at least one light emitting diode of the LED dot matrix module, the open / short abnormality corresponds to the respective open / short abnormality. And a sensing unit for outputting sensing information to the main control unit. The method of claim 1, The driving unit; A first detection circuit which receives the data from the main controller and stores the data, and receives the control signal from the main controller and switches to the sensing mode; When reference data is set and the first detection circuit is switched to the sensing mode, the stored data is output to the light emitting diodes to compare the reference data with sensing data indicating a current operating state of the light emitting diodes. A second detection circuit configured to transmit data regarding the open / short abnormal state to the first detection circuit when the open / short abnormality occurs in at least one light emitting diode, The first detection circuit receives data regarding the open / short abnormal state, and transmits address data of the light emitting diode in which the open / short abnormal occurs, to the detection unit, and the detection unit detects the response in response to the address data. Failure detection apparatus, characterized in that for transmitting information to the main control unit. The method of claim 2, And the first detection circuit is provided as a digital circuit, and the second detection circuit is provided as an analog circuit. The method of claim 2 or 3, The first detection circuit; An open / short detection starter which receives the control signal from the main control unit and outputs a sensing mode on signal for switching to a sensing mode; Data buffers for receiving and storing the data from the second detection circuit; An open / short controller which receives the sensing mode on signal from the open / short detection starter and controls the second detection circuit to detect the sensing information, and receives the sensing information from the second detecting circuit and transmits the sensing information to the sensing unit; Failure detection device comprising a. The method of claim 4, wherein The second detection circuit; First setting data for detecting a level at which the output voltage level of the light emitting diode indicates an open state from the reference voltage, a second setting for detecting a level at which the output voltage level of the light emitting diode indicates a short state A reference unit comparing the data to determine an open or short operation state of the light emitting diodes; A converter which receives an external resistance value, receives the reference voltage from the reference unit, and converts the reference voltage into an amount of current for adjusting brightness of the light emitting diodes; An output driver which receives data driving the light emitting diodes, receives the converted current amount from the converter and outputs data driving the light emitting diodes; Receives the sensing mode on signal from the open / short detection starter and operates in the sensing mode, receives the address data corresponding to the light emitting diodes, and operates the light emitting diode from the driving data output from the output driver. And an open / short detector for detecting a signal and transmitting the sensed data indicating the detected operating state to the open / short controller. The method according to claim 1 or 2, The driving unit; Even when the general mode is any one of a dynamic mode, a video mode, and a magnetic mode, the control unit receives the control signal and switches to the sensing mode. And when the sensing mode ends, switching to an operation mode before switching to the sensing mode of the normal mode.

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