KR20090128151A - Digital image processing system for high definition resolution - Google Patents

Abstract

PURPOSE: A digital image processing system for high definition resolution of a sign board is provided to monitor an individual LED error state through a monitor without checking a signal board by an operator, thereby recognizing whether the sign board wrongly operates. CONSTITUTION: A measurement LED module(300) receives power by a separate power device. A camera photographs LED images according to each color. A measurement computer(500) measures and analyzes data according to each color. A measurement controller(600) offers data for lighting LEDs on to the LED module.

Description

Digital Image Processing System for High Definition Resolution of Electronic Display Board

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital image processing system for realizing a high resolution resolution of an electronic signboard. In particular, the present invention relates to a digital image processing system that detects luminance and chromaticity correction and display errors of an LED in an electronic signboard. The present invention relates to a digital image processing system implemented at a resolution.

It is well known that high-definition broadcasting (HDTV) has been commercialized due to the development of image technology and semiconductor technology, and that the advancement of image quality is rapidly progressing throughout the entire image media due to the popularization of LCD television.

Pure green LED and blue LED have been developed and applied to the electronic display board, and full colorization is progressing rapidly. However, the development of technology that expresses the image simply and beautifully without image correction and spots near natural colors The development of technology for realizing the image is not yet reached. Although some error detectors and corrections are partially made, no integrated system has been developed that accommodates all of them.

Applicant has also responded to the trends of the times with digital broadcasting and high resolution with an electronic signboard system that has improved resolution by various image sources, scaling-processed display boards and dynamic interpolation scans such as Patent 623036, as in Patent No. 468209. If dozens or millions of LEDs are combined, make up the billboard. The reality is that there is a limit in implementing high resolution such that minute LEDs are not uniform in brightness or color.

Therefore, the object of the present invention is to solve the above-mentioned shortcomings, achieve the uniformity of the screen of the display board, and the convenience of the maintenance and the high resolution, which makes it easy for the operator to detect and manage the LED defects through the monitor. The present invention provides a digital image processing system and a method for implementing a high resolution of an electronic display panel that satisfies all of them.

Digital image processing system that implements the high-definition resolution of the electronic display board according to the present invention for achieving the above object, the measurement LED module is fixed to the measuring table of claim 1 to receive power by a separate power supply device; A camera (CCD) for capturing an image of each color LED displayed on the LED module; Measure and analyze data for each color of LED inputted by the camera to display individual luminance and chromaticity values, average value, maximum, minimum value, and distribution of LEDs. A measurement computer for setting a desired target value; And a measurement controller that interfaces with the measurement computer and provides data to the LED module to light LEDs of the LED module in red, green, blue, and white in accordance with the data measured by the measurement computer. It features.

According to claim 1, the measurement controller according to claim 1, wherein the measurement controller is a pattern generator for generating a data and module address for causing the LED to be turned on or off for each color, the LED module and the signal method match Including the LED module interface and the module address selector for changing the signal shape according to the LED shape such as the longitudinal map, the horizontal map or the static / dynamic of the LED module. It features.

In addition, the present invention is a video signal input unit for receiving a variety of video input signals, such as NTSC, HDTV, DVI signals of claim 3, the main video signal controller for scaling the input video signal corresponding to the resolution of the display board, and control When the semiconductor is used as an LED driving means for driving the LED for displaying the captured image, a correction signal for selectively performing the individual LED luminance / chromatic correction even if the semiconductor has an LED individual luminance / color adjustment means or not. A main controller consisting of a luminance / chromatity correcting unit for generating a; A field memory for storing image data scaled to a screen corresponding to four times the display resolution transmitted from the main controller through a time generator, and scanning only four times the required data among the image data stored in the field memory. Locale consisting of an address selector for displaying an image of the resolution, and error information collecting unit for collecting the data on the defective LEDs from the LEDs for displaying the image to the main controller to allow the administrator to recognize whether the LED is defective controller; In addition to the gray scale using a pulse width modulation (PWM) method, the LED driver is driven according to the signal of the local controller and senses whether an LED malfunctions and transmits it to the error information collecting unit. It characterized in that it comprises an LED module consisting of a plurality of LEDs.

According to claim 3 of the present invention, the address selector is configured to use a red, green, blue LED of the adjacent fixed pixel to configure a virtual interpolation pixel, thereby improving the electronic display resolution four times. It is characterized by.

According to claim 3, the present invention, when the image data stored in the control computer of the main controller through the LED module, the brightness and chromaticity correction of the image data is stored in the control computer It is characterized by the fact that it can process only a correction program.

In addition, the present invention according to claim 3, wherein the live image is displayed through the LED module by the image signal transmitted from the main controller, the semiconductor driving the LED driving unit LED individual brightness / chromaticity adjustment means Is used, the measurement data for the red, green, and blue individual LEDs of the LED module is stored in the correction data memory designated by the external input terminal or the control computer of the main controller, and the image data is stored in the frame memory. After storing in frame units, the data values of the LEDs stored in the correction data memory and the image data values stored in the frame memory are mixed and corrected so that the corrected converted data is displayed on the LED module.

In addition, the present invention according to claim 3, wherein the live image is displayed through the LED module by the image signal transmitted from the main controller, the semiconductor driving the LED driving unit LED individual brightness / chromaticity adjustment means In the case of using this, each of the LED output terminals of the LED module is stored in the designated correction data memory by storing the previously calculated correction data, reading the correction data value at the initial setting of the electronic display board, and transmitting it to the corresponding address and latching it in the register. It characterized in that the image of the uniformity is expressed by controlling the current of.

The present invention provides a display method for displaying the image stored in memory, such as advertising billboards according to the schedule or the live image; According to the drive IC with or without individual LED brightness / color adjustment means, the operator selects and executes LED individual brightness / color correction to enable luminance / color correction on virtually all electronic boards.

In addition, by accommodating various LED modules such as the vertical map of the LED module or the shape of the LED such as the lateral map or the static / dynamic, it provides a measuring device that can automatically and automatically measure individual LED brightness and chromaticity.

In addition, it is possible to recognize the malfunction of the LED board by detecting the LED error condition with the monitor without checking the LED board.

In addition, by applying the electronic board system with improved resolution by dynamic interpolation scanning, it implements a high-definition electronic board that improves 4 times the resolution, and it is effective to satisfy the uniformity, high resolution, and fault detection of the recently required electronic board. have.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a digital image processing system that implements a high-definition resolution of the display board according to the present invention.

1 is a view showing the configuration for the LED individual luminance and chromaticity measuring apparatus for implementing the present invention.

As shown in the drawing, when the LED individual luminance and chromaticity measuring device 400 applied to the present invention is roughly divided, the LED module 300 and the LED module 300, which are used as a measurement sample and used to construct an electronic board, are fixed. Mounting unit 310 used to support, the power supply unit 320 used to supply power to the LED module 300, the photographing unit 700 consisting of a camera used to photograph the LED module 300, the measuring controller ( 600) and a measurement computer 500.

Therefore, the measurement computer 500 uses the lighting command of each LED obtained from the LED module 300 by the photographing unit 700 as well as the measurement command for each LED in the LED module 300. After measuring the individual luminance and chromaticity, the chromaticity and luminance of the LEDs are corrected according to the measurement results, thereby realizing a high-quality electronic display board at all times. Detailed description thereof will be described with reference to FIGS. 2 to 4.

FIG. 2 is a flowchart of the LED individual luminance and chromaticity measuring device 400 of FIG. 1, which will be described with reference to FIG. 1.

 The measurement computer 500 executes the collection of the measurement command and the measured data and the correction value conversion. That is, when the measurement computer 500 starts the measurement 401, the measurement controller 600 turns on the LED module 300 in the order of red, green, blue, and white, and the image lit for each color is the camera. (402, 403), the individual luminance and chromaticity values and the average, maximum, minimum, and distribution of the LEDs are calculated by the measurement computer 500 (404) and displayed on the monitor of the computer. The red, green, and blue measurement values and the red, green, and blue correction values are divided and stored (406, 407), and the operator sets the target value through the calculated data (405).

LED compensation can be set separately by brightness and chromaticity. Actually corrected display data are as follows.

<When only correcting the luminance of the LED>

    R 'A11 0 0 R R' = A11 x R

    G '0 A22 0 G G' = A22 x G

    B '0 0 A33 B B' = A33 x B

Where R 'is the corrected red data, R is the original uncorrected red data, and A11 is the correction constant.

<When calibrating only LED chromaticity>

           R 'A11 A12 A13 R

           G 'A21 A22 A23 G

           B 'A31 A32 A33 B

 Thus, the corrected red is expressed as R '= A11xR + A12xG + A13xB, green as G' = A21xR + A22xG + A23xB, and blue as B '= A31xR + A32xG + A33xB (408), which constitutes one pixel. The above equation holds by moving the color coordinates by lighting LEDs of different colors in the pixel.

3 is a block diagram showing the configuration of the measurement controller 600 shown in FIG.

The measurement controller 600 includes a pattern generator 602 for generating data and an address for a module to cause LEDs to be turned on individually or individually by color, an LED module interface 603 for matching a signal type with a module, and an LED module. It consists of a module address selector 604 that changes the signal shape according to the shape of the LED such as the vertical map, the horizontal map, or the static / dynamic. Therefore, the measured data and the correction value should be identified and stored in any form. In the case of a small display board, it is easy to manage, so the data is stored in the operating computer 500 of the display board, and the LED module 300 includes a serial number or a bar code. An easy method can be selected for identification, and in the case of mass production or a large display board, a memory chip may be attached to the LED module 300 to store measurement / calibration data in the LED module 300. Therefore, in the latter case, it is easy to identify the data by directly storing the data in the LED module 300.

4 is a block diagram showing the configuration of a photographing unit 700 which is a measuring camera of FIG. 1.

The photographing unit 700 includes a filter 701, a camera (CCD) 702, first to third optical black level offset adjusters 703, 704, 705, first to third gain adjusters 706, 707, 708, and white balance adjuster 709. A gamma adjuster 710, a Hue Chroma adjuster 711, and a measurement computer interface 712.

The camera (CCD) 702 and the filter 701 are generally employed in video equipment, and selecting a high resolution product improves accuracy, and the first to third optical black level offset controllers (703, 704, 705). ), Color gain by the first to third gain adjusters 706, 707, and 708, gamma adjustment by the gamma adjuster 710, and Hue chroma adjuster 711. By doing so, the color is corrected and transmitted to the measurement computer 500 through the interface 712.

The measurement computer 500 measures the measurement data of the displayed image provided from the photographing unit 700.

Directly to the control computer 15 of the main controller 100, or to the measurement data.

Luminance / chromatic correction is performed. The calibration data obtained by this calibration is measured controller

It is provided to the LED module 300 through the 600 or to the luminance / chromaticity correction unit 30 of the main controller 100 to be described later.

5 is a block diagram of an image processing system of a signboard portion according to the present invention.

The image processing system of FIG. 5 illustrates the respective components of the display of FIG. 1 in more detail, and the main controller 100 serves to provide various image sources (NTSC, HDTV, DVI signals, etc.) to an electronic board. . The main controller 100 has a detailed configuration and operation, as described in FIG. 1, to avoid overlapping description and obscure the technical gist of the present invention in consideration of what has been disclosed in Patent No. 468209 to which the applicant is patented. It will be described briefly to the extent that it is not described, and focuses on the relevant components for which LED individual luminance / chromatic correction, which is a feature of the present invention, detects an error indication and implements resolution by interpolation.

The image processing system shown in FIG. 5 is roughly divided into a main controller 100 for adjusting an image signal to an electric signboard, a local controller 200 for efficiently distributing and managing a large amount of data, and an LED module 300 for displaying an actual image. In the main controller 100, the image transmission device 3 and the PC graphic 5 provide an image source to the image input unit 1. The image input unit 1 receives various image signals such as NTSC, HDTV, and DVI signals from the image transmitting device 3 and the PC graphics 5. The video input unit 1 incorporates a video input / speed converter circuit unit 7 and a PC graphics input circuit unit 9. The main video signal control unit 11 is connected to the output side of the video input unit 1, and the main video signal control unit 11 is a control computer 15 used for the operator to operate the electronic display board and a monitor for monitoring the video output. It is connected to the part 17, respectively. The control computer 15 plays a role of determining whether to display the video signal transmitted from the video transmission device 3 or the video signal from the PC graphic 5. The control computer 15 sets a gamma correction value for the image data processed by the main image signal controller 11 and controls the schedule of the image screen displayed through the LED display 302, brightness for day and night, and the like. In addition, the control computer 15 stores a correction program for correcting the displayed image in the internal memory, and serves to correct the image using the correction program when displaying the image file stored in the internal memory. This will be described later. The video data processed by the main video signal controller 11 is provided to the input / output buffer 13. A signal generator 19 and a timing generator 21 are provided for displaying a stable screen without distortion or shaking of the video screen. The secondary gamma converter 22 properly corrects the characteristics of the LED and the like constituting the LED module 300 and then outputs the luminance / chromium correcting unit 30. The luminance / chromatic correction unit 30 stores correction data for correcting each LED corresponding to the displayed image, which will be described in detail with reference to FIG. 6 to be described later. The indrive 40 transmits the image data output from the luminance / chromatic correcting unit 30 to the local controller 200 installed in close proximity to the LED module 300.

The local controller 200 includes a time generator 201, a field memory 202, and an address cell.

Collector 203, which is a matrix in which the LED module 300 consists of numerous LEDs

Because it has a structure, it is impossible to transmit the video signal serially,

To transmit the video signal. Detailed configuration thereof

See description disclosed in patent 252619. In addition, the address selector 203

Dynamic interpolation can be used to increase the resolution to 4x. Detailed configuration

Reference may be made to the description disclosed in Applicant Patent No. 623036. In addition, the local controller 200 further includes an error information collecting unit 204 which collects error information of the LED driver 301 and provides it to the control computer 15. This will be described in detail later with reference to FIG. 7.

Image data output from the local controller 200 is output to the LED module 300 is expressed as an image. The LED module 300 includes an LED driver 301 and an LED indicator 302. The LED driver 301 is implemented with a semiconductor chip. The LED driver 301 may have a function of correcting image data by setting a driving current for driving each LED of the LED indicator 302. This will be described later with reference to FIGS. 7 and 8.

As shown in FIG. 1, the image displayed by the LED module 300 is measured by the LED individual luminance / chromatic measurement unit 400, which is the core technology of the present invention, and the measurement data is analyzed to calculate correction data.

6 is a block diagram of the luminance / chromatity correcting unit 30 having five displays.

As shown in FIG. 6, the luminance / chromatity correcting unit 30 includes a first correction data memory 31, a program.

A frame memory 32, a second correction data memory 33, a mixer 34, and a selector 35. The first correction data memory 31 stores correction data made by the measurement computer 500 and transmitted through an external input terminal, or stores correction data provided from the control computer 15.

The frame memory 32 stores image data provided from the front secondary gamma converter 22. The second correction data memory 32 stores correction data made by the measurement computer 500 and transmitted via an external input, or stores correction data provided from the control computer 15.

The first and second correction data memories 31 and 32 serve to store correction data.

It is common in terms of loss, but its output side is one connected to mixer 34 and the other

There is a difference connected to the selector 35. The mixer 34 corrects an image signal to be displayed and outputs it to the selector 35. The selector 35 selects the corrected image signal provided from the mixer 34 and provides it to the local controller 200 when the LED module 300 does not have a correction function on its own.

In this way, the individual LED calibration is made in three ways. The first is a case in which a predetermined image is stored in an operating computer such as a commercial advertisement and the live image is not displayed according to a predetermined schedule. Individual correction is possible without the same luminance / chromatity correction unit, and the measured data values for correction can be saved and used in the operating computer. Image file such as MPG → BMP → Data correction → BMP → Image file such as MPG → Save → Read → Display.

Therefore, there is an inconvenience to always go through this route when changing the displayed data, but there is an advantage that can be corrected only by the program without changing the hard circuit.

The second is an electronic display board displaying a live image and using a semiconductor having no individual luminance control means. The measurement data for each LED module measured by the measuring device of FIG. 1 is controlled by an external input terminal or a control computer. 31), the frame memory 32 stores a video image in units of frames. Since the red, green, and blue individual LED correction values of the LED board are stored in the first correction data memory 31, the data corrected when the data value and the correction value of the frame memory 32 are mixed and transmitted to the corresponding module. Is displayed, and the screen of the target brightness and chromaticity is displayed.

In this case, all images have the trouble of undergoing such correction, while using an IC without individual correction has an advantage of low cost.

The third is an electronic display board for displaying a live image, and a semiconductor having individual luminance adjusting means is used. The detailed operation state of the electronic display board will be described in detail later with reference to FIGS. 7 and 8. Image Image data is normally transmitted to the display panel, and luminance / color correction is stored in the calibration data memory 33 by reading the calibration data measured by the measuring device, and is read out at the initial setting of the display board and transmitted as a Bright Control signal to the corresponding address. Latching on the resistors limits the current at each LED output terminal, resulting in an LED panel with a targeted uniformity. That is, in the case of using a semiconductor having an individual brightness control means, since the Bright Control of the semiconductor is executed with the separate correction data without the conversion of the image image data, there is an advantage that it is convenient to control. Luminance / chromaticity correction, which operates in these different patterns, is selected by the control computer operating the display board, and the operator selects and executes the correction regardless of how the display board is configured. Such luminance and chromaticity correction will be described in detail later with reference to FIGS. 10 to 12.

7 and 8 are diagrams respectively displayed in relation to the LED module 300 shown in FIG. 5, FIG. 7 is a circuit diagram of LED driving means, and FIG. 8 is a functional block diagram of a semiconductor configuration having individual luminance adjusting means.

The video image is a 16-bit gradation signal for each color of red, green, and blue, which is 65,536 steps, and the colors that can be represented are 65,536 X 65,536 X 65,536 = 281,474,976,710,656. The video signal is displayed by changing the luminance by the pulse width modulation method (PWM). The video signal is displayed by changing the luminance by the pulse width modulation method (PWM). The signal supplied to the serial input terminal S IN is supplied with grayscale data corresponding to actual image data and bright data, which is correction data, and is shifted and displayed in each register. LED driving current limits the constant current to flow by attaching a resistor to the reference current setting input (IREF). If it is limited to 20mA, output current (OUT0-OUT16) flows a constant current of 20mA. Individual LED current compensation is done by 7BIT bright data, and the brightness of LED is kept constant by subtracting the current value set at the reference current setting input (IREF).

That is, as shown in FIG. 7, each LED driver 301 controls the operation of each LED of the LED indicator 302 through output units OUT0 to OUT15 of 16 units, and monitors the output signal to detect an error. The result is provided to the error information collecting unit 204 of the local controller 200 through the output terminal XERR. The error information collecting unit 204 collects error data provided from each LED driving unit 301 and transmits the error data to the control computer 15, and the control computer 15 displays the LED indicator 302 based on the collected error information. The error occurrence position is detected on the display and displayed through the monitor unit 17, thereby enabling the electronic display manager to easily identify the error state. The LED driver 301 sets the LED driving current to determine the LED display 302. It may have a function to correct the image displayed by each LED.

This will be described based on FIG. 8. The LED driver 301 of FIG. 8 includes a gray scale data register / latch 301a, a brightness control register / latch 301b, a 16-bit PWM timing control 301c, a reference current setting unit 301d, a current driver / control 301e, an LED error detector 301f, a calculator 301g, and an LED error data latch 301h.

The video signal consists of 16 bits of gradation for each red, green, and blue (RGB) forming a pixel.

It can be represented as an arc, and the video signal has a luminance according to the pulse width modulation method (PWM).

I can adjust it. The gray scale data of the image data to be actually displayed and the bright data corresponding to the correction data are input to the gray scale data register / latch 301a. Bright data corresponding to the correction data is input to the brightness control register / latch 301b. The reference current setting unit 301d constants the LED driving current applied to the LED indicator 302.

It plays a role of limiting within current. Accordingly, the output terminal of the LED error detection unit 301f

The LED driving current output from (OUT0-OUT15) is limited within a certain current. The current driver / control 301e changes the driving current to be applied to each LED so as to correct luminance and chromaticity of the displayed image according to the correction data of the brightness control register / latch 301b and then through the LED error detection unit 301f. Output to LED indicator 302. The LED error detection unit 301f detects an error with respect to a drive current to be applied to each LED and provides error data according to the result to the LED error data latch 301h. The LED error data latch 301h provides the error data to the error information collecting unit 34 of the local controller 200. Correction data stored in the brightness control register / latch 301b, for example, when the bright data is 7-bit binary data and a drive current of up to 50 mA is implemented, as shown in Table 501 of FIG. 9 to be described later. As the data increases by one unit, the output current (mA) output to each LED increases by 0.4mA, and the ratio of the output current changes.

9 is a diagram showing a correction current and a ratio when the luminance and chromaticity correction is 7 BIT. When the luminance and chromaticity correction is 7 BIT, the ratio decreases and increases by 0.8% and 0.4 mA when the current is set to 50 mA. It can be seen that it is reduced.

Therefore, the reference current should be set in consideration of the LED brightness distribution and the brightness of the target signboard.If the LED brightness distribution is 10%, set the setting current to 105% of the LED recommended current value and set the target value to 100%. You can perform a calibration that adjusts 5% down, resulting in a uniform, uniform display of 100% brightness.

However, it is usually designed for a safe current range not exceeding 100% for safety, and the LED brightness is getting brighter, so it can be set below. When the chromaticity and the luminance are simultaneously corrected, the target value is further adjusted downward.

FIG. 10 is a diagram illustrating a flow in a case where an image file stored in a control (operation) computer is displayed on an electronic display.

First, when the image file stored in the control computer 15 is displayed on the display board, the control computer 15 calculates the correction data for the image data directly and performs the correction, which will be described with reference to FIG. 2.

In order to apply any of the image data correction methods described above, a process of measuring an image displayed by the LED module 300 using the LED individual luminance and chromaticity measuring units 400 of FIG. 1 is required.

In FIG. 5, when the control computer 15 stores an image file for display on the electronic display board, and the control computer 15 directly corrects the image data, the stored image file is provided to the LED module 300 so that the image is displayed. The file is displayed (811).

Then, the LED individual luminance and chromaticity measuring unit 400 measures the displayed image and outputs the measurement data to the control computer 15 (812).

The control computer 15 stores the measurement data (813) and calculates correction data for the measurement data using a pre-stored correction program. That is, the control computer 15 converts the video file (MPG) of the measurement data into an image file (BMP), corrects luminance / chromaticity with respect to the image file (BMP), and then converts the corrected image file into a video file ( MPG), and then corrected video file is stored (814).

Then, when the image is displayed on the actual display board, the image file stored in the control computer 15 and corrected is provided to the LED module 300 to display the image (815).

When the control computer 15 corrects the image file directly, the image file is replaced.

If necessary, perform the above correction method again to correct the image file.

All you need is

On the other hand, when the live image provided by the main controller 100 to the display board

As an example, when the LED module 300 has its own image data correction function, that is, when the LED driver 301 is implemented as shown in FIG. 8, image correction is performed when the LED is initially set, and since When displaying an image, a corrected image may be provided at all times.

FIG. 11 is a flowchart illustrating a case in which the live image provided by the main controller 100 is displayed on the display board when the LED module 300 has its own image data correction function (when using a semiconductor having individual brightness control). .

In the case of FIG. 11, the LED module 300 applies a video data correction function by itself.

In the case of a loss (in the case of using a semiconductor having individual brightness control), correction data is calculated and provided to the LED module 300 to correct image data.

In the main controller 100 of FIG. 1, a live image provided from various image sources is displayed through the LED module 300 (821).

Thereafter, the LED individual luminance and chromaticity measuring units 400 measure the displayed image and correct the luminance / chromatic correction data according to the target value set by the administrator for the measured data. The data is stored in the data memory 33 (822, 823).

The calibration data stored in the second calibration data memory 33 is stored in the brightness control register / latch 301b of the LED module 300 at the initial setting of the display board, and the current driver / control 301e is used using this calibration data. The initial setting to adjust the LED driving current output from the () (824) (see Figure 8).

 After that, the luminance / chromaticity is corrected according to the LED driving current initially set when the live image provided by the main controller 100 is actually displayed.

Finally, the live video provided by the main controller 100 is displayed on the electronic display.

When the LED module 300 does not have an image data correction function by itself, a method of correcting image data using the luminance and chromaticity correction unit 30 may be applied.

FIG. 12 is a flowchart illustrating a case in which a live image provided by the main controller 100 is displayed on the electronic display board when the LED module 300 does not have an image data correction function.

FIG. 12 illustrates that when the LED module 300 does not have an image data correction function by itself, the image data is corrected and displayed by using the luminance / chromatic correction unit 30 of the main controller 100.

LED live video provided from various video sources in the main controller 100

The image is displayed through the module 300 (831).

Then, the second luminance of the luminance / chromic correcting unit 30 is corrected by the LED individual luminance / chromatic measuring unit 400 measuring the displayed image and correcting the luminance / chromatic correction according to the target value set by the administrator for the measured data. The data is stored in the data memory 33 (832, 833).

Mixer 34 is configured to adjust the data and correction data provided from first correction data memory 31.

Image data provided from the memory 32 to be mixed and corrected.

The corrected data is output to the LED module 300 through the local controller 200 (834) (see FIG. 5).

The LED module 300 displays image data corrected by the luminance / chromatic correcting unit 30 (835).

FIG. 13A is a diagram illustrating coordinates when only luminance is corrected, and FIG. 13B is a diagram illustrating coordinate shift states when correcting chromaticity.

The present invention also detects the individual LED error state is detected by the LED error detection unit of Figure 7 is output to the error data out or Serial Data Out (SDO).

The error signal is collected in the error information collecting device located in the local controller 200 of FIG. 5 and specifically analyzed where the LED of the module is transmitted to the control computer so that the operator may not display the display board. Can be recognized.

FIG. 14 is an exemplary view of fixing and interpolating (virtual) pixels of red, green, and blue LEDs, which are three primary colors of light, one by one.

This embodiment is applied to the electronic display system of the resolution improved by the applicant's patent No. 623036 dynamic interpolation scanning, which consists of fixed, interpolated (virtual) pixels of one of the three primary colors of light, red, green, and blue LEDs. The solid line represents the fixed pixel and the dotted line represents the interpolation pixel set to virtual.

The interpolation scanning method increases the resolution of the horizontal 2 times the vertical 2 times the total 4 times, and is executed in the address selector of the local controller 200 of FIG. In FIG. 5, the main image controller 11 of the main controller 100 transmits image data to a local controller 200 located on a display panel by scaling the screen to a screen corresponding to 4 times (horizontal, 2 times vertical) resolution of a display board. The data stored in the memory is scanned by the address selector to perform 4x (2x horizontally and 2x vertically) resolution image display.

Horizontal resolution For example, in case of fixed pixel, it reads 0, 2, 4 --- N net memory image data and operates the fixed pixel LED of solid line to display a screen similar to interlaced scanning, and operates virtual interpolation pixel. In this case, the image data of the field memory reads the image data of 1, 3, 5, ---- (N-1) address and scans it on the LED board. The address of LED board module is 0, 2, Scanning by counting 4 --- N and scanning by counting in order of 1, 3, 5, ---- (N-1), the image composed of interpolation pixels is displayed.

The present invention can achieve the uniformity of the display screen, and also enables the operator to easily detect and manage the LED defects through the monitor, thereby satisfying both the convenience of maintenance and high resolution.

1 is a view showing the configuration for the LED individual luminance and chromaticity measurement apparatus for implementing the present invention,

FIG. 2 is a flow chart for the LED individual luminance and chromaticity measuring device of FIG. 1 display;

3 is a block diagram schematically illustrating a configuration of the measurement controller 600 of FIG. 1.

4 is a block diagram schematically illustrating a configuration of a photographing unit 700 which is a measuring camera of FIG. 1.

5 is a block diagram of an image processing system of an electric signboard portion according to the present invention;

6 is a block diagram of the luminance / chromatity correcting unit 30 of 5 display,

7 and 8 are diagrams respectively displayed in relation to the LED module 300 shown in FIG. 5, FIG. 7 is a circuit diagram of LED driving means, and FIG. 8 is a functional block diagram of a semiconductor configuration having individual luminance adjusting means.

9 is a diagram showing a correction current and a ratio when luminance and chromaticity correction is 7BIT;

FIG. 10 is a diagram illustrating a flow in a case where an image file stored in a control (operation) computer is displayed on an electronic display.

FIG. 11 is a flowchart of a case in which a live image provided by the main controller 100 is displayed on the electronic display board when the LED module 300 has its own image data correction function (when using a semiconductor having individual luminance control). ,

FIG. 12 is a flowchart of a case in which a live image provided from the main controller 100 is displayed on the electronic display board when the LED module 300 does not have an image data correction function by itself.

FIG. 13A is a diagram illustrating coordinates when only luminance is corrected, and FIG. 13B is a diagram illustrating coordinate shift states when correcting chromaticity.

FIG. 14 is an exemplary diagram illustrating fixed and interpolated (virtual) pixel configuration of red, green, and blue LEDs, which are three primary colors of light, one by one.

* Description of the symbols for the main parts of the drawings *

100: main controller 200: local controller

300: LED module 400: LED luminance / chromaticity measuring unit

500: measuring computer 600: measuring controller

700: shooting unit

Claims (7)

A measurement LED module fixedly installed on a measuring table to receive power by a separate power supply; A camera (CCD) for capturing an image of each color LED displayed on the LED module; Measure and analyze data for each color of LED inputted by the camera to display individual luminance and chromaticity values, average value, maximum, minimum value, and distribution of LEDs. A measurement computer for setting a desired target value; And An electronic board including a measurement controller that interfaces with the measurement computer and provides data to the LED module to light LEDs of the LED module in red, green, blue, and white in accordance with the data measured by the measurement computer. Digital image processing system with high resolution. The method of claim 1, wherein the measurement controller is a pattern generator for generating a data and module address for the LED to be turned on or off individually by color, an LED module for matching the signal type with the LED module, and the LED module High-resolution resolution of the electronic signboard, including a module address selector that changes the signal shape according to the shape of the LED such as the vertical map, the horizontal map, or the static / dynamic One digital image processing system. Drives a video signal input unit that accepts various video input signals such as NTSC, HDTV, and DVI signals, a main video signal controller that scales the input video signal according to the resolution of the display board, and an LED for displaying a controlled image. In the case of using a semiconductor as an LED driving means, a luminance / chromic correcting unit for generating a correction signal for selectively performing LED individual luminance / chromatic correction even if the semiconductor has or does not have LED individual luminance / chromatity adjusting means. Main controller consisting of; A field memory for storing image data scaled to a screen corresponding to four times the display resolution transmitted from the main controller through a time generator, and scanning only four times the required data among the image data stored in the field memory. Locale consisting of an address selector for displaying an image of the resolution, and error information collecting unit for collecting the data on the defective LEDs from the LEDs for displaying the image to the main controller to allow the administrator to recognize whether the LED is defective Controller; and In addition to the gray scale using a pulse width modulation (PWM) method, the LED driver is driven according to the signal of the local controller and senses whether an LED malfunctions and transmits it to the error information collecting unit. Digital image processing system that realizes the high resolution of the electronic display board including an LED module consisting of a plurality of LEDs. 4. The display panel of claim 3, wherein the address selector is configured to virtually interpolate pixels using red, green, and blue LEDs of adjacent fixed pixels, thereby improving the display resolution by four times. The implemented digital image processing system. The method of claim 3, wherein when the image data stored in the control computer of the main controller is displayed through the LED module, the luminance and chromaticity correction of the image data can be processed by only a correction program previously stored in the control computer. Digital image processing system that implements the high-resolution resolution of the display. The LED module of claim 3, wherein a live image is displayed through an LED module by an image signal transmitted from the main controller, but the semiconductor driving the LED driver is one in which there is no LED individual luminance / color adjustment means. The measured data of red, green, and blue individual LEDs are stored in the correction data memory designated by the external input terminal or the control computer of the main controller, and the image data are stored in the frame memory in frame unit, and then the correction data are stored. Digital image processing that implements a high definition resolution of an electronic display board by mixing and correcting data values of LEDs stored in a memory and image data values stored in the frame memory so that the converted converted data is displayed on the LED module. system. According to claim 3, wherein the live image is displayed through the LED module by the image signal transmitted from the main controller, the semiconductor driving the LED driving unit, the specified correction data when using the individual LED brightness / chromaticity control means In the memory, the calculated calibration data is stored, and at the initial setting of the electronic display board, the calibration data value is read and transmitted to the corresponding address and latched in a register to control the current of each LED output terminal of the LED module to display an image of uniformity. Digital image processing system that implements the high-definition resolution of the billboard.

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