KR20000030183A - Apparatus of self test and error chek of led display - Google Patents

Abstract

PURPOSE: A self diagnosis device of an electric sign is provided to solve simply a trouble of an electric sign by performing a self diagnosis for LED pixels. CONSTITUTION: A self diagnosis device of an electric sign comprises a control portion(201), buffer portions(202,203), an R voltage monitor portion(204), a G voltage monitor portion(205). a 16R voltage monitor circuit(206), a 16G voltage monitor portion(207), a line interface portion(208). The control portion controls a corresponding monitor portion. The buffers receives a voltage monitoring data. The R voltage monitor portion searches voltages of R LED pixels. The G voltage monitor portion searches voltages of G LED pixels. The 16R and the 16G voltage monitor circuits obtain R and G search data of 16bits (206). The line interface portion provides driving data of the corresponding LED data.

Description

Fault self-diagnosis device for all-optical display device {APPARATUS OF SELF TEST AND ERROR CHEK OF LED DISPLAY}

The present invention relates to an apparatus for diagnosing failure of an electric signboard, which enables self-diagnosis and monitoring of LED pixel failure in an all-optical display device.

All-optical display device using LED matrix structure receives control signal and display data (text, pattern, etc.) from PC and converts it into data for driving LED and converts voltage level for driving LED. By turning on or off, the LED matrix display dynamically displays images of desired characters and designs.

Such an all-optical display device is used in a wide variety of applications in that its purpose is to visually provide a variety of rich information such as advertisements, traffic information, various guides, and the like.

For example, in the case of providing various information including traffic information on the road, the electronic display panel often uses a large screen that can be easily recognized even at a long distance. In order to use such a large screen, an LED pixel is used. It is concentrated to tens or millions and forms a structure.

However, in the use of such an all-optical display device, when a failure of the LED pixel occurs, it is impossible to express an image of an accurate character or a design, and thus, automatically diagnoses the failure of the pixel of the all-optical display device. Therefore, a function for providing the diagnosis result to the operator is required.

In order to meet these demands, a variety of display board diagnosis technologies have been proposed. By detecting and comparing current values flowing through the display panel with a microcomputer control method, it is possible to easily diagnose a display device failure individually, in a group or as a whole. When the display data is transferred to the display unit unit under the control of the self-diagnosis circuit (Korean Patent Publication No. 95-6578) or the microprocessor in the display control unit of the display board, the display state data detected by the display unit unit is temporarily stored. A display module for an electronic display board and a method of checking the operation state of the electronic display board including a data transmitting / receiving processing unit provided to a microprocessor side and allowing an operation state of an operating electronic display board to be inspected have been proposed.

In the former case, the current flowing through the power supply line of the display element is detected using a CT, and the detected current value is amplified and A / D converted to diagnose the display element. You need to install

In the latter case, the voltage level supplied to the display element is detected using an operational amplifier, the detected voltage information is transmitted using a register and a transceiver, and the transmitted display state data is transmitted through an error data RAM (RAM). Since the microprocessor can read the microprocessor, the transmitting means and the receiving means of the display state data must be separately provided.

The present invention detects and level converts a voltage that varies depending on whether or not the LED pixel is defective or the connection of the corresponding LED pixel and the connector, and converts the level converted LED pixel fault diagnosis signal per color using a multiplex and selector processor. It is possible to search and diagnose in 32-bit and 16-bit units, thereby providing a self-diagnosis device for all-optical display devices that enables simpler hardware and precise fault diagnosis.

1 is a schematic block diagram of an all-optical display device according to the present invention;

2 is a block diagram of a failure self-diagnosis apparatus of the present invention.

Figure 3 is a circuit diagram of the voltage monitor unit in the present invention

1 is a block diagram showing a schematic configuration of an all-optical display device to which the present invention is applied, and includes a PC 101 by all-optical display control and data, control, etc. for connecting the PC 101 and all-optical display control circuit. Under the control of the data display processing unit 103 and the data display processing unit 103 for receiving and processing the display data from the PC 101 via the ISA bus 102 and the ISA bus 102 as a signal interface. A display driver 104 for driving an LED pixel such that a corresponding image (text, pattern, etc.) is displayed, and a display unit 105 having an LED matrix structure for displaying the corresponding image under driving control of the display driver 104. And a voltage monitor unit 106 for monitoring a voltage level to diagnose whether the display unit 105 has a failure of the LED pixel, and an LED pixel voltage monitored by the voltage monitor unit 106. The search data processing interface unit 107 for receiving the error detection data received and the data of the search data processing interface unit 107 are input to supply search data to the PC 101 through the ISA bus 102. It includes a search data processing unit 108 for.

In FIG. 1, the PC 101 outputs image information such as a character or a picture to be displayed all-optically, receives and displays fault diagnosis information, and performs a control command of a user.

The PC 101 controls the all-optical display through the ISA bus 102.

The data display processing unit 103 converts the input image data such as text or design into data for displaying the text or design on the LED matrix, and inputs the converted data into the display driver 104.

The display driver 104 turns on or turns off the corresponding LED pixel of the display unit 105 according to the input LED matrix driving data so as to display image information such as a text or a pattern having a desired content.

The failure of the LED pixel of the display unit 105 is searched by using a voltage level that varies depending on whether the corresponding LED pixel is normally driven. This is used by the voltage monitor unit 106 to determine the voltage of the LED pixel of the display unit 105. Monitor and search.

The voltage of the LED pixel retrieved by the voltage monitor unit 106 is converted to the TTL level and output for the subsequent process, and the retrieved data is supplied to the retrieval data processing unit 108 through the retrieval data processing interface unit 107.

The search data processing unit 108 supplies the search data related to the failure of the corresponding LED pixel to the PC 101 through the ISA bus 102 in response to the driving of the LED pixels (timing synchronization). It makes it possible to grasp the information that diagnoses which LED pixel is broken at a glance.

To this end, the search data processing unit 108 supplies an address signal Addr to the search data processing interface unit 107, and receives the LED pixel search data R_CP and G_CP from the search data processing interface unit 107. It is.

Figure 2 is a block diagram showing the configuration of the part related to the self-diagnosis of the fault in the all-optical display device to which the present invention is applied, the embodiment when the LED display is an LED matrix structure consisting of red (R) and green (G). to be.

Referring to FIG. 2, the apparatus for diagnosing failure of an all-optical display device according to the present invention receives a failure diagnosis control signal (PC_I / F Control) for a predetermined LED pixel of a display unit through a PC interface and controls the corresponding monitor unit. A control unit 201 for outputting the voltage monitoring data (CP_Data) obtained as a result of the control, buffers 202 and 203 for inputting the voltage monitoring data to the control unit 201, and red among the LED pixels of the display unit. An R voltage monitor unit 204 for searching the voltage of the (R) LED pixel and a G voltage monitor unit 205 for searching the voltage of the green (G) LED pixel.

In addition, the R voltage monitor unit 204 is configured to obtain the 16-bit search data corresponding to the 16 pixels when the 8 pixels are driven as one unit. And the G voltage monitor unit 205 is a 1G voltage monitor circuit to 16G voltage monitor for obtaining 16-bit search data corresponding to 16 pixels when driving 8 pixels as one unit. A circuit 207 is provided to allow 32 bits of search data processing per color.

In addition, the display driver includes a line interface unit 208 for supplying an enable signal (voltage) of the LED pixel corresponding to the timing of driving the LED display unit.

Here, the line interface unit 208 is a portion for supplying driving data of the corresponding LED pixel from the data display processing unit 103 to the display driving unit 104, and is provided between the data display processing unit 103 and the display driving unit 104. Can be.

The operation of the failure self-diagnosis apparatus of the all-optical display device according to the present invention made as described above is as follows.

As described with reference to FIG. 1, when an image such as a character or a pattern is displayed on the display unit 105 by the data display processing unit 103 and the display driver 104 in response to the image data from the PC 101, Voltage signals RLE # n and GLE # n for driving the LED pixels R_LED and G_LED of the display unit 105 are applied.

This voltage signal is supplied to the voltage monitor units 204 and 205 through the line interface unit 208.

Accordingly, the R voltage monitor unit 204 searches for the voltage of the R_LED, and the G voltage monitor unit 205 searches for the voltage of the G_LED.

Each voltage monitoring is carried out by voltage monitor circuits 206 and 207. The internal circuit configuration of this voltage monitor circuit is shown in FIG.

The first level converter 301 is for searching for a failure of the LED itself, and the second level converter 302 is for searching for a failure of a connector of the corresponding LED, and each of predetermined predetermined voltages of the input terminal THRES is set. Outputs the low or high signal at the output terminal (OUT) in comparison with the voltage value, and the variable resistor (VR1, VR2), resistors (R1, R2) and capacitor (C1, C2) was added.

When the nth R_LED is driven, the RLE # n voltage is supplied to the input THRES of the level converters 301 and 302 through the variable resistor VR1.

The first level converter 301 compares the input voltage with a predetermined reference voltage and outputs a signal for searching for a failure of the corresponding R_LED. When the LED is on, a first level converter 301 outputs a low signal and turns off the state. In this case, a high signal is output.

The second level converter 302 outputs a signal in which the corresponding R_LED connector is detected by comparing the input voltage with a predetermined reference voltage, and outputs a low signal when the corresponding LED connector is in an open state. If it is connected normally, it outputs high signal.

The result of the above voltage monitoring (high or low signal) is that the voltage level is different when the LED is turned on and off, and the voltage level is different when the LED connector is open or connected. Will be used.

That is, the search data signal (SCR # n; nth R_LED search data) (CCR # n; nth R_LED connector search data) is output according to whether the LED is normally driven and the state of the corresponding LED connector.

This operation is similarly performed for the G_LED.

That is, the GLE # n voltage from the line interface unit 208 is converted to the TTL level through the level converters 301 and 302 when the nth G_LED is driven, and the corresponding search data signal (SCR # n; nth G_LED search data) ( CCR # n; nth G_LED connector search data).

The LED and connector search data signals monitored by the voltage monitors 204 and 205 are inputted to the control unit 201 through the buffers 202 and 203. As described above, 8 pixels are set to 1 unit in units of 16 bits. 32 bits of color data are input to the control unit 201 through the buffer.

In this way, the search data input to the control unit 201 is supplied to the PC 101 through the ISA bus 102, so that the PC 101 compares the image data currently displayed on the display unit with the searched result. The failure of the pixel and its connector can be diagnosed at once.

As described above, the self-diagnosis apparatus for the all-optical display device according to the present invention allows the driver to display the image on the display unit of the LED matrix structure through the PC interface from the PC, and the corresponding LED and the display unit of the LED matrix structure. The PC monitors whether the connector has failed and receives the search result again, so that not only which LED is broken, but also which LED connector is broken in real-time in synchronization with the video display. Diagnosis can be made.

The fault self-diagnosis apparatus of the all-optical display device according to the present invention can obtain 8 LED pixels as one unit to determine whether the corresponding LED is broken from the result of voltage monitoring, and perform the diagnosis of the fault. The presence or absence can be automatically searched in real time in synchronization with the display timing of the text or pattern.

In addition, the self-diagnosis apparatus of the all-optical display device of the present invention conventionally installs CT on the LED pixel power supply line, or converts and transmits and receives the LED pixel voltage using a resistor, a line transceiver, and a line receiver. Compared to a technology that stores the data in RAM and allows the processor to read the data, the failure of the LED pixel can be directly diagnosed, thereby increasing the accuracy of the diagnosis and reducing the diagnostic error of the diagnostic device.

Claims (3)

In order to display the image data from the PC on the display of the LED matrix structure, data conversion and driving control are performed, and a signal for detecting the failure of the corresponding LED is supplied to the PC to diagnose a failure of the LED display device. In A voltage monitoring means for monitoring a change in voltage level corresponding to whether the corresponding LED is on or off in synchronization with the corresponding LED display driving timing of the display unit and outputting fault detection data of the corresponding LED; and the searching monitored by the voltage monitoring means. A self-diagnostic apparatus for failure of an all-optical display device, comprising an interface means for supplying data to a PC. The method of claim 1, wherein the voltage monitoring means is to monitor the LED drive voltage level that varies depending on whether the corresponding LED connector is open or connected to diagnose whether the corresponding LED connector failure. Fault self-diagnosis device. The method of claim 1 or 2, wherein the voltage monitoring means monitors 32 bits of search data per color in 16-bit units using 8 LED pixels as one unit, and provides them to a PC through an interface means. Self-diagnosis device for faulty electronic display.