KR101113910B1 - Led pixel diagnosis apparatus for led display board - Google Patents

Abstract

The present invention discloses an LED pixel inspection device for an LED display board. The disclosed LED pixel inspection apparatus for a LED display board includes a camera unit for photographing an image displayed on the LED display board; An LED pixel inspecting unit converting the LED display image photographed by the camera unit into a display image signal for each LED pixel, and outputting abnormal LED pixel information by comparing with the LED image driving image signal for driving the LED display panel; It is configured to include, it is possible to detect the LED pixels that occur easily, quickly, and accurately at low cost without adding a separate configuration to the LED display board.

LED, LED display board, LED pixel, LED pixel inspection, color signal

Description

LED pixel inspection device of LED display board {LED PIXEL DIAGNOSIS APPARATUS FOR LED DISPLAY BOARD}

The present invention relates to an LED pixel inspection apparatus of an LED display board for detecting abnormal LED pixels of an LED (Light Emitting Diode) display board.

In general, an LED (Light Emitting Diode) display panel refers to an LED display device that is installed in a commercial advertisement board, various performance halls, stages, etc. in the indoor and outdoor to express various images and characters.

LED devices used in the LED display device can emit light with high brightness while reducing power consumption by the development of LED device technology. In addition, devices having various colors and sizes have been provided to obtain the required resolution. For this reason, the LED element is most preferred for constituting a pixel of a large outdoor billboard.

The LED display panel in which the LED elements having the above characteristics are applied to the R, G, and B pixels is formed by arranging the LED pixels composed of the LED elements outputting R, G, and B on a grid to form a display panel, and then output image information. Or a driver for controlling light emission of the LED element according to the image signal transmitted from the central controller, and outputting the image screen.

The LED display board of the above-described configuration should always check the failure of the LED element for accurate representation of the output image. This is because the image quality of the output image is deteriorated when the LED device does not operate, which makes it difficult to accurately transmit information. In addition, in order to detect each damaged pixel, an efficient detection method other than the method of visual identification was not provided, which required a lot of time and cost for maintenance.

Therefore, in the case of the prior art, a method and apparatus for enabling a quick and accurate inspection of the LED elements of the LED display panel has been disclosed.

Examples of such a prior art include the "Fault Detection Circuit of the Electronic Display Device" (Prior Art 1) of Korean Patent Application Publication No. 2001-2238 and the "Poor pixel detection method and the bad pixel detection device of LED display plate" of Korean Patent No. 990993. "(Prior Art 2).

In the related art 1, a detection circuit including a voltage divider and a comparator is arranged in parallel at an output terminal of a pixel driver that controls on / off of an LED pixel forming a pixel of an LED display board of a display unit, so that the voltage at the output terminal of the pixel driver is greater than or equal to a predetermined value. If so, it is determined to be normal, and if it is below a predetermined value, it is configured to be determined to be a failure.

Therefore, in the case of the prior art 1, a circuit is complicated because a detector connected in parallel to each pixel driver is added, and the installation cost of the LED display board is increased.

The prior art 2 is configured to detect the brightness by sequentially lighting the horizontal and vertical lines of the LED display board to detect the brightness, and then detect the LED pixels located at the intersection of the horizontal and vertical lines outside the preset brightness value as a bad pixel. Accordingly, the prior art 1 makes it possible to detect defective pixels without configuring a separate circuit on the LED display board.

However, in the case of the related art 2, since the horizontal and vertical lines of the LED display board are sequentially turned on, the luminance is measured and the process of determining whether the LED is in the predetermined luminance range is repeatedly performed. Has

In addition, the prior art 2 has a problem that the output through the display device is impossible when detecting the failure of the pixels forming the LED display board.

Therefore, the present invention for solving the above-described problems of the prior art, so as to accurately diagnose the failure and the location of the LED pixels (LEDs) constituting the pixels of the LED display board without affecting the driving of the LED display board An object of the present invention is to provide an LED pixel inspection device of the LED display board.

It is another object of the present invention to provide an LED pixel inspection apparatus of an LED display board which can detect a malfunctioning LED pixel of the LED display board while driving the LED display board without executing a separate test mode.

LED pixel inspection apparatus of the LED display board of the present invention for achieving the above object, the camera unit for photographing the image displayed on the LED display board; An LED pixel inspection unit converting the LED display image photographed by the camera unit into a display image signal for each LED pixel, and outputting abnormal LED pixel information in comparison with the LED image driving image signal for driving the LED display panel. It is characterized by.

In the above configuration, the display image signal is a color signal or an on / off signal generated by light emission of the LEDs constituting the LED pixels, and the driving image signal is input to the LED display panel to display an image on the LED display panel. Means a color signal or an on / off signal for each LED.

The camera unit includes all digital cameras such as a general digital camera configured to output a captured image screen as a digital signal, a mobile phone embedded in a mobile communication terminal, and the like.

The LED pixel inspecting unit may include: a display image signal generation unit configured to generate a color signal for each pixel or an on / off signal from the display image of the LED display board photographed by the camera unit; A comparison unit comparing the display image signal for each LED pixel generated by the display image signal generation unit with the driving image signal corresponding to the LED pixel to detect LED pixels having different signals as abnormal LED pixels; And an output unit configured to output the abnormal LED pixel information including the position information of the abnormal LED pixel detected by the comparison unit.

The present invention may further include photographed image information of the camera unit and the preset image output image signal, wherein the comparator includes a driving image signal corresponding to the time information and a display image of the image plate photographed by the camera unit. It can be configured to compare the signals.

The comparison unit may be configured to compare the driving image signal and the display image signal in image frame units forming an image output from the LED display board.

The comparison unit may be configured to further output abnormal state information for each LED.

The LED pixel inspecting unit may further include an electronic sign area detecting unit detecting the electronic sign area in the captured image of the camera unit.

The display board area detecting unit divides the detected LED display board area into an LED pixel area disposed in an actual LED display panel and assigns a coordinate value so that the coordinate values of each divided pixel area in the image of the detected display board area are actually changed. It may be configured to represent the position coordinates of the LED pixel disposed on the LED display board.

The output unit may be configured as a display device for displaying an image, a printer device for outputting printed matter, a recording device such as a USB, magnetic or optical disk device for recording and storing detection data, and the like.

The LED pixel inspection unit may further include a driving image signal generation unit for generating and outputting a predetermined test driving image signal for the LED pixel inspection of the LED display board.

The LED pixel inspection method of the LED display board of the present invention, in the LED inspection device having a camera unit, an electronic display board area detection unit, a comparison unit, a display image signal generation unit, a storage unit and a communication unit, the LED display plate for the LED pixel inspection A drive video output process for outputting a video signal; A display image signal generation process of photographing an LED display panel for outputting an image screen by the driving image signal using the camera unit and then generating a display image signal for each LED pixel of the LED display panel; And an LED pixel inspection process for outputting abnormal LED pixel information by comparing the driving image signal with the display image signal.

The display image signal generation process may be a process of detecting a display area of the LED pixel included in the set coordinates after detecting the LED area from the image image photographed by the camera unit. have.

The LED pixel inspection process may be a process of outputting abnormal LED pixel information including abnormal state information of the LED pixel.

The present invention can determine the abnormality of the LED pixels included in the display image photographed by photographing the display image of the LED display board in the same manner as the visual identification method so that the abnormality of each LED pixel of the LED display board can be accurately examined.

Since the present invention also examines the LED pixels by photographing the display image of the LED display board, the cost required for installation and maintenance of the LED display board is not required because a separate additional circuit is not required for the LED display board. Saves.

The present invention also compares the driving image signal and the display image signal of the LED display board and detects the moving LED pixels so that the LED pixel inspection of the LED display board can be performed without disturbing the image output of the LED display board.

In another aspect, the present invention, by taking a display image of the LED display board to check the abnormality of the LED pixel, it is possible to perform the LED pixel inspection regardless of the manufacturer and type of all the LED display board.

The present invention also allows the inspection of the entire LED frame output to the LED display board at a time so that the inspection of the LED pixels configured in the LED display board can be performed faster than in the prior art.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a configuration of an LED pixel inspection apparatus 100, an LED display panel 2, and an LED display panel 2 according to an embodiment of the present invention.

The central controller 1 is located at a remote location and transmits a driving image signal to the LED display board 2 via wireless or wired to control the driving of the LED display board 2. In addition, the central controller 1 transmits a driving image signal for driving control of the LED display board 2 to the LED pixel inspecting unit 20. In this case, the driving image signal transmitted to the LED display board 2 includes time information to be output for each image frame to be displayed, and coordinate values (address: address) and color signal values of each LED pixel 3 corresponding to each frame. do.

The LED display board 2 includes LED pixels 3 arranged on a lattice. When the LED pixels 3 output a color image, the LED elements for outputting three colors of R, G, and B are formed to form a group.

The LED display board 2 configured as described above includes a driving driver (not shown) for controlling the respective LED pixels 3 to display an image according to an old video signal input for image display.

The LED display panel 2 is standardized to a predetermined size and individually includes LED pixels 2 so as to facilitate transportation, installation, replacement, and maintenance, and each of which has a driving driver for controlling driving of the LED pixels. It may be formed by assembling the substrate module. In this case, the LED display board 2 may further include a main controller (not shown) for controlling each of the substrate modules to output a corresponding portion of one image.

As illustrated in FIG. 1, the LED pixel inspecting apparatus 100 includes a camera unit 10 and an LED pixel inspecting unit 20.

The camera unit 10 includes all digital cameras such as a general digital camera configured to output a captured image screen as a digital signal, a mobile phone embedded in a mobile communication terminal, and the number N of cameras depends on the size of the display board. You can choose. The photographing image screen information of the LED display board 2 photographed by the camera unit 10 includes photographing time information.

The LED pixel inspection unit 20 includes a display image signal generation unit 21, a comparison unit 24, an output unit 25, and a driving image signal including an electronic display area detection unit 21 and a display image signal generation unit 23. It comprises a generation unit 26, storage unit 27 and the communication unit 28.

The electronic sign area detecting unit 21 is configured to detect the LED sign area in the captured image of the camera unit 10. In addition, the signboard area detecting unit 20 divides the detected LED signboard area into an area of the LED pixel 3 disposed on the actual LED signboard 2 and assigns a coordinate value to each of the images of the detected signboard area. The coordinate values of the divided pixel region are configured to represent the position coordinates of the LED pixel 3 arranged on the LED display panel 2 in reality.

The display image signal generation unit 23 is configured to generate color signals for each LED pixel from the display image of the LED display board 2 photographed by the camera unit 10. At this time, the detected color signal is detected to have color signal values of three colors of R, G, and B.

The electronic sign area detecting unit 21 or the display image signal generating unit 23 is a serial communication interface (not shown) such as USB, RS232C, or Bluetooth, an infrared communication interface for communication with the camera unit 10. It may be configured to be connected to each of the camera unit 10, including a short-range communication interface (not shown).

The comparator 24 is a display image signal for each pixel generated by the display image signal generator 23 and a drive image signal corresponding to the image screen of the LED display board 2 photographed from the central controller 1. Are compared so as to detect LED pixels different from each other as abnormal LEDs. In this case, the driving video signal also includes time information displayed on the LED display board 2, and the comparator 24 is configured to compare the display video signal corresponding to the time information with the driving video signal.

In addition, the comparison unit 24 is configured to compare the driving video signal and the display video signal in an image frame unit forming an image output from the LED display board 2 for a quick inspection of the LED pixel 3, etc. Various methods of comparison can be applied.

The comparison section 24 is further configured to control the entire LED pixel inspection section 20 in addition to the above-described functions. That is, the LED pixel inspection unit 20 controls the image photographing of the camera unit 10 by controlling the signboard area detection unit 21 or the display image signal generation unit 23 to which the camera unit 10 is connected. It is configured to control each configuration of.

The output unit 25 is configured to output position information of the abnormal LED pixel detected by the comparison unit 24. The output unit 25 may include a display device for displaying an image, a printer device for outputting printed matter, a recording device such as a USB for recording and storing detection data, a magnetic or optical disk device, and the like.

The driving image signal generation unit 26 is configured to generate and output a predetermined test driving image signal for inspecting the LED pixel 3 of the LED display board 2. The drive video signal generated by the drive video signal generator 26 also includes time information to be output from the LED display board 2.

The storage unit 27 includes software for driving the LED pixel inspection unit 20, reference data information, a component image signal received from the central controller 1, and a driving image signal generated by the driving image signal generator 26. It stores information such as driving video signal, LED pixel test result information which are stored in itself.

The communication unit 28 is to provide a communication interface between the LED pixel inspection unit 20 and the central control unit 1, a local area communication interface device including a communication interface such as Bluetooth, infrared, RS232C, or LAN network And a broadband communication interface device via a private network, a mobile communication network, an Internet network, or the like.

Hereinafter, an operation process of the LED pixel inspecting apparatus 100 having the above configuration will be described.

2 is a flowchart illustrating a process of an LED pixel inspection method of an LED display panel using the LED pixel inspection apparatus 100.

As shown in FIG. 2, the LED pixel inspection method of the LED display board includes a communication connection process (S10), a drive image signal output process (S20), a display image signal generation process (S30), and an LED pixel inspection process (S40).

The communication connection process (S10) refers to a process of connecting the central control unit 1 and the LED pixel inspection unit 20 to perform communication.

When the inspection of the LED pixel 2 of the LED display panel 2 is necessary, the inspector installs the camera unit 10 at a position where the LED display panel 2 can be inspected and then communicates with the LED pixel inspection unit 20. Connect via The LED pixel inspection unit 20 is also connected to the central control unit 1 using the communication unit 28. When the connection is completed, the LED inspection unit 20 performs communication with the central control unit 1 so as to perform communication.

As described above, a driving video signal output process S20 is performed in which the central controller 1 outputs a driving video signal for outputting an image to the electronic display board 2 while the communication is connected.

The driving video signal output process S20 refers to a process of outputting an image for inspecting an LED pixel to the electronic display panel 2.

In this case, the driving video signal output to the electronic display board 2 may be an output video signal of the electronic display board 2 stored in the central control unit 1 or a test driving video signal stored in the storage unit 7 of the LED pixel inspection unit 20. The driving image signal may be a test driving image signal generated by the driving image signal generation unit 26 of the LED pixel inspecting unit 20.

When the driving image signal is an output image signal of the electronic display board 2 stored in the central control unit 1, the central control unit 1 transmits the driving image signal to the LED display board 2 and outputs the image through the LED display board 2. At the same time, the drive image signal including time information output to the LED display board 2 is transmitted to the LED pixel inspection unit 20. The LED inspection unit 20 that receives the driving video signal transmitted from the central controller 1 temporarily stores the received driving video signal in the storage unit 27.

On the contrary, when the driving image signal is stored in the storage unit 27, the LED pixel inspection unit 20 transmits the driving image signal to the central control unit 20 and outputs the driving image signal to the electronic display panel 2.

In addition, when the driving image signal is generated by the driving image signal generation unit 26, the LED pixel inspecting unit 20 stores the generated driving image signal in the storage unit 27, and sends it to the central controller 20. Transmits the signal to the electronic display panel 2.

After the image is output to the electronic display panel 2 by the driving image signal output process S20, the display image generation process S30 for LED pixel inspection is performed.

3 is a flowchart illustrating a detailed processing of the display image signal generation process S30 of FIG. 2.

As shown in FIG. 3, the display image signal generation process S30 includes an electronic sign photographing process S31, an electronic sign area extraction process S32, an LED pixel coordinate setting process S33, and a display image signal acquisition process S34. .

In order to generate the display image signal, the camera unit 10 photographs the LED display panel 2 displaying the image by the driving image signal. Photographing by the camera unit 10 may be performed by the control of the inspector or the comparator 24, and the captured image image includes time information.

In the signboard area extraction process (S32), the signboard area is extracted from the image image photographed by the camera unit 10. To this end, the LED signboard image screen data photographed by the camera unit 10 is input to the signboard area detecting unit 22, and the image area of the LED signboard 2 included in the video image is extracted.

In the LED pixel coordinate setting process (S33), the extracted LED display panel 2 is divided into grids by the number of LED pixels 3 arranged on the LED display panel 2 in actuality. Each coordinate of the divided LED pixels 3 is applied by applying the same coordinate system as that of the LED display board 2. Each segmented area then contains an image of the LED pixels 3 and has sufficient resolution to identify each LED pixel 3.

In the display image signal acquisition process (S34), by analyzing the color information output from the LED pixels included in each divided area in the image image of the LED board set the LED pixel coordinates to detect the color signal value output for each LED pixel Generates a display video signal. In this case, the detected color signal value may be expressed as an R, G, B tricolor signal value, or may be simply expressed as a value indicating on / off of the LED pixel. The display image signal information generated as described above is output to the comparator 24 together with the photographing time information of the display board 2 by the camera unit 10.

After the display image signal is generated by the display image signal generation process S30, the process returns to the process of FIG. 2 to perform the LED pixel inspection process S40.

In the LED pixel inspection process (S40), the comparison unit 24 compares the display image signal input from the display image signal generation unit 23 with the driving image signal having the same time information stored in the storage unit 27. At this time, if the corresponding driving video signal and the color signal included in the display video signal are different in each LED pixel, the corresponding LED pixel is detected as the abnormal LED pixel. When the abnormal LED pixel is detected, the comparison unit 24 stores the coordinate information of the corresponding LED pixel in the storage unit 27 or outputs it through the output unit 25.

In this case, the comparison unit 24 may further generate and output abnormal state information including abnormal states for each LED of R, G, and B for the abnormal LED pixels.

By this inspection, the inspector or the manager of the LED display board 2 can easily and quickly and accurately find out the LED pixel in which the abnormality occurred.

1 is a connection configuration diagram of the central control unit 1, the LED display board 2 and the LED pixel inspection apparatus 100 according to an embodiment of the present invention,

2 is a flow chart showing a process of the LED pixel inspection method of the LED display board using the LED pixel inspection apparatus 100,

3 is a flowchart illustrating a detailed processing of the display image signal generation process S30 of FIG. 2.

* The description of the key symbols in the drawings *

1: central control unit 2: LED display board

3: LED pixel 10: camera unit

20: LED element inspection unit 27: storage unit

Claims (8)

A camera unit for capturing an image displayed on the LED display board; An LED pixel inspection unit converting the LED display image photographed by the camera unit into a display image signal for each LED pixel and outputting abnormal LED pixel information by comparing with the LED image driving image signal for driving the LED display panel; The LED pixel inspection unit, A display image signal generation unit configured to generate a color signal for each pixel or an on / off signal from the display image of the LED display board photographed by the camera unit; And comparing the display image signal for each LED pixel generated by the display image signal generator with the driving image signal corresponding to the LED pixel to detect LED pixels having different signals as abnormal LED pixels. LED pixel inspection device of the LED display board. delete The method of claim 1, The captured image information of the camera unit and the preset display image signal includes time information, And the comparing unit is configured to compare the driving image signal corresponding to the time information with the display image signal of the display board photographed by the camera unit. The method of claim 1, wherein the comparison unit, The LED pixel inspection apparatus of the LED display board, characterized in that configured to compare the drive image signal and the display image signal in the image frame unit of the image output from the LED display board. The apparatus of claim 1, wherein the comparator is further configured to output abnormal state information for each of the LEDs. delete delete delete

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