KR100815587B1 - Open/short detecting arrapatus and method for led dot matrix module - Google Patents

Abstract

The present invention relates to a failure detection device for a light emitting pixel circuit of a light emitting diode dot matrix display device and a method thereof. The failure detecting apparatus includes a main control unit for outputting data and control signals, a general mode and a sensing mode, and includes a light emitting diode dot matrix module to receive data and control signals from the main control unit and output display information in a normal mode or a sensing mode. When the driving unit and the driving unit operate in the sensing mode, when an open / short abnormality is generated in at least one light emitting diode of the LED dot matrix module by receiving display information from the driving unit, a sensing corresponding to each open / short abnormality is detected. And a sensing unit for outputting information to the main control unit. The general mode here includes a dynamic mode, a video mode and a magnitude mode. Therefore, according to the present invention, by detecting the open / short and the normal state of the light emitting diodes corresponding to various operating modes, it is possible to check the current operating state of the light emitting diodes and the LED dot matrix module.

LEDs, display devices, pixel defects, fault detection devices

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. In addition, the main controller 102 uses the cascade method to control signals for detecting whether the open / short detection unit 110 is open, short or normal for each of the LED light emitting units 106. It transmits to the LED dot matrix driver 108 of 104, and receives the detection information corresponding to the control signal from the open / short detection unit 110, to determine the defective state of each 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 is a failure detection circuit (120, 140 of Figs. 3 and 5) in the LED dot matrix driver 108 to detect the 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 back to FIG. 2, the driver 108 selects any one of the dynamic mode, the video mode, and the magnetic mode 112 through 116 under the control of the main controller 102 to drive the LED module 104. At this time, when a specific signal is input from the main control unit 102 to operate in the open / short detection mode 118, the open / short detection mode 118 in the dynamic mode, the video mode, or the magnetic mode 112, 114, or 116 is used. Each color data, for example, a 16 * 16 dot matrix module, detects the operating state of each LED using 16 color data (RED, GREEN, BLUE), respectively. Then, the sensing data is output to the driver of the next stage connected by cascade or the driver of the next stage that is sequentially connected, and the sensing information is output to the open / short detector 110 through the driver of the last stage.

Here, the clock signal GCLKx is a clock signal for gray level processing in the video mode and the magnitude mode, each of the data REDx, GREENx, and BLUEx is color data, and the clock signal SCLKx is a clock signal for data transmission. In addition, the control signal LATCHx is a command for storing data to the video data memory (not shown) inside 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. to be. The control signal OUT_EN is a command for adjusting the luminance, and the data A [3: 0] represents a line address scanned in the dynamic mode 112, and in the video mode 114 and the magnitude mode 116, the color data to be grayscaled is displayed. The line address stored in the internal video data memory is shown. The data VDCD [1: 0] is then used to control the LED dot matrix in video mode 114 and magnitude mode 116, white balance, brightness and dot correction. ) And video data memory.

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 by the main controller 102, the first detection circuit 120 switches the operation mode currently being used to the open / short detection mode, and the respective LEDs. The operating state of the LED light emitting modules of the modules is detected. The first detection circuit 120 connects the sensed data for each LED to the open / short detector 110 in the case of the next stage or the last stage in connection with the second detection circuit (140 of FIG. 5). send.

As shown in FIGS. 6 and 7, the first detection circuit 120 receives a specific signal according to an operation mode and switches to the open / short detection mode. That is, the first detection circuit 120 may detect the specific signal SCLK, LATCH, OUT_EN or SCLK from the main controller 102 regardless of whether the previous operation mode of the video display device 100 is the dynamic mode, the video mode, or the magnetic mode. , LATCH, OUT_EN, LOAD), the detection signal (DETECT) for switching from the open / short detection starter 122 to the open / short detection mode is transmitted to the open / short controller 124 to open / short detection mode. Switch to
Specifically, as shown in FIG. 6, when the current operation mode is the dynamic mode, the open / short detection starter 122 clocks together with the color data RED, GREEN, and BLUE from the main controller 102. When the control signals LATCH and OUT_EN of the high level synchronized with the signal SCLK are input at the same time, the activated detection signal DETECT is output to the open / short controller 124 to switch to the open / short detection mode. In addition, as shown in FIG. 7, when the current operation mode is the video mode or the magnitude mode, the open / short detection starter 122 receives the clock signal SCLK and the low level LATCH, OUT_EN and LOAD signals from the main control unit 102. When is input, the activated detection signal (DETECT) is output to the open / short controller 124 to switch to the open / short detection mode. At this time, the open / short controller 124 detects the detection mode on signal DET_ON indicating the open / short detection mode to the second detection circuit 140 and the LEDs indicating the positions of the LEDs in units of the respective LED modules 104. The address data (DT1SE [5: 0] in Fig. 4) is output. For example, in the LED address data DT1SE [5: 0], one LED module includes 16 LEDs for each color (RED, GREEN, and BLUE), and outputs address data of 48 channels. In addition, the open / short controller 124 receives the detected data from the second detection circuit 140 and analyzes the data, and the next stage of the color data RED0, GREED0, BLUE0 of the detected data through the data buffers 126 ˜ 130. The driving unit or the open / short detection unit 110 is transmitted.

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 open / short controller 124 of 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]. The set value (R2SE [2: 0]) for detecting the open level of the output stage and the set value (R1SE [2: 0]) for detecting the short level of each LED output stage are compared to determine whether each LED is open or short. 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 voltage set value BSEL [3: 0] is received from the reference unit 142, and a current amount for adjusting the brightness of each LED is transmitted to each output driver 150 to 154.

The output drivers 150 to 154 are digital data CH1ON [15: 0], CH2ON [15: 0], and CH3ON [15: 0 that turn LEDs of each channel on and off from the color data (RED, GREEN, BLUE). ) And drive signals CH1OUT [15: 0], CH2OUT [15: 0], CH3OUT [15: 0] to the respective channels to drive the LEDs according to the amount of current transmitted from converters 144 to 148. Output

The open / short detector 156 receives the sensing 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 detection data IND_SH and IND_OP indicating the state of the detected LED are transmitted to the open / short controller 124. Accordingly, the open / short controller 124 cascades the detection data IND_SH and IND_OP corresponding to the LED address data DT1SE [5: 0] from the open / short detector 156 through the driver 108 of the next stage. Transfer to the open / short detection unit 110 by the id method.

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, when a specific signal for switching to the sensing mode is input from the main controller 102 as shown in FIG. 6 or 7, the open / short controller 124 displays the state of the LED as shown in FIG. 4. The detection mode on signal DET_ON indicating the open / short detection mode to the open short detector 156 of the second detection circuit 140 and the address data DT1SE [ 5: 0]). At this time, the second detection circuit 140 receives the sensing mode on signal DET_ON, and as shown in FIG. 8 or 9, each color data (for example, in case of a 16 * 16 dot matrix module, RED). , GREEN and BLUE (16 channel data respectively) are switched to the ready state to confirm each state. 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. Transmission is sequentially performed corresponding to the data DT1SE [5: 0]. The open / short controller 124 outputs sensing data IND_SH and IND_OP indicating an open or short state of each LED in response to the LED 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 108 by dividing into two cases, a dynamic mode and a video and magnitude mode.

Referring to FIG. 6, in the dynamic mode, the clock signal SCLK and three control signals LATCH and OUT_EN of the 14 input signals of the driver 108 shown in FIG. 2 are used in the open / short sense mode. Switch. That is, when the high level control signals LATCH and OUT_EN are input in synchronization with the clock signal SCLK from the main control unit 102 to the driving unit 108, the driving unit 108 moves from the dynamic mode to the open / short detection mode. Switch.

In the video and magnitude modes, as shown in FIG. 7, the clock signal SCLK and the three control signals LATCH, OUT_EN, and LOAD among the 14 input signals input from the main controller 102 to the driver 108. ) Are activated, switch to open / short detection mode. That is, when the low level control signals LATCH, OUT_EN, and LOAD are inputted in synchronization with the clock signal SCLK from the main controller 102, the driver 108 switches from the video and magnitude modes to the 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 LED of the 48 channels is changed. Check the open / short status or normal status data. Subsequently, the detected 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 140 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 of duty ratio 1/2, 1/4, 1/8, or 1/16 rather than the static method, the driving units 108 are 96 degrees. Drive 192, 384, or 768 LEDs. In this case, the driver 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 configured in units of 16 lines, and in the case of FIG. 8, each line by using the control signal A [3: 0] for controlling the line scan. The operation of each LED is detected by repeating the open / short operation.

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 from the main controller 102, the image display device 100 of the present invention detects the operation state of the LEDs regardless of the previous operation mode. Switch to detection mode. At this time, the 16 clock signals SCLK are output from the main controller 102 to the driver 108, and are output through the first and second detection circuits 120 and 140 in synchronization with the clock signals SCLK. Sensing data (132, 134, 136 of FIG. 3) indicating an open / short or normal state is included for each LED through the data (REDO, GREENO, BLUEO of FIG. 3), and each sensing data (132, 134, 136). Is finally transmitted to the open / short detector 110.

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 shift the sensed data to be transmitted to the open / short sensing unit 110. .

In addition, the driving unit 108 having a scan circuit detects open / short data for each line and outputs the sensed 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 switched from the dynamic mode ends, it is required to switch to the dynamic mode again to display previous text, image data, and the like. Therefore, in order to detect the open / short data and transmit the sensed data to the open / short detector 110 and then switch back to the dynamic mode, the low level control signal OUT_EN from the main controller 102 to the driver 108. ) And the dynamic mode is output to perform the normal dynamic mode.

Referring to FIG. 12, even when the open / short detection mode is terminated in the video and magnitude mode, it is necessary to switch back to the video and magnitude 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 controller 102 to the driver 108, the mode is switched to the video and magnitude mode.

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)

In the video display device including at least one light emitting diode dot matrix module having a plurality of light emitting diodes, the fault detection device for detecting the operating state of the light emitting diodes: A main controller for outputting color data and a control signal for driving the LED dot matrix modules to display an image on the image display device; The image display apparatus includes a plurality of operation modes and a sensing mode for displaying an image, and when a control signal for activating the sensing mode is input from the main controller, the operation is performed in response to the activated control signal. A light emitting diode which switches from one of the modes to the sensing mode, outputs the color data to the light emitting diodes, and compares the output data of the light emitting diodes with internal reference data to sense an operating state of the light emitting diodes. A dot matrix module driver; When the light emitting diode dot matrix module driver operates in the sensing mode, the light emitting diode dot matrix module receives sensing information on an open / short state of each of the light emitting diodes from the light emitting diode dot matrix module driver and outputs the detected information to the main controller. Failure detection device comprising an open / short detector. The method of claim 1, The light emitting diode dot matrix module driver; A first detection circuit configured to receive and store the color data from the main controller and to output a sensing mode on signal to receive the activated control signal from the main controller and to switch to the sensing mode; When the reference data is set therein and the sensing mode on signal and the address data of each of the light emitting diodes are input from the first detection circuit, the color data stored from the first detection circuit is transferred to the light emitting diodes. And outputs the reference data and the output data of the light emitting diode corresponding to the address data, and when the open / short state occurs in at least one of the light emitting diodes, sense data regarding the open / short state. A second detection circuit for transmitting to the first detection circuit, Wherein the first detection circuit outputs the sensing information including the sensing data and the address data of the light emitting diode in which the open / short state is generated, to the light emitting diode dot matrix open / short sensing unit. Sensing device. 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 activated control signal from the main controller and outputs the sensing mode on signal; Data buffers for receiving and storing the sensed data from the second detection circuit; The sensing mode on signal is received from the open / short detection starter to control the second detection circuit to detect the sensing information, and the sensing information is received from the second detecting circuit to the light emitting diode dot matrix open / short sensing unit. Failure detection device comprising an open / short controller for transmitting. The method of claim 4, wherein The second detection circuit; A first setting data for detecting a level at which the output voltage level of the light emitting diode is in an open state and a level at which the output voltage level of the light emitting diode is in a short state from a reference voltage set therein and the reference voltage; A reference unit comparing the reference data including two setting data to determine an open or short operation state of each 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 the color data driving the light emitting diodes, receives the converted current amount from the converter and drives the light emitting diodes to output the output data of the light emitting diodes; Receiving the sensing mode on signal from the open / short detection starter and operating in the sensing mode, receiving the address data corresponding to the light emitting diodes, and operating the light emitting diode from the output data output from the output driver And an open / short detector for detecting a state and transmitting the sensed data indicative of the detected operating state to the open / short controller. The method according to claim 1 or 2, The light emitting diode dot matrix module driver; Even when the operation mode is any one of a dynamic mode, a video mode and a magnetic mode, the controller receives the activated control signal from the main controller and switches to the sensing mode, And when the sensing mode ends, switching to an operation mode before switching to the sensing mode among the operation modes.

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