KR100318277B1 - Apparatus For Controlling Color Level of Image Display System with Light Emitting Diode Array and method for controlling the same - Google Patents

Abstract

The present invention provides a configuration of a display control device for processing image data for reproducing the LED dot matrix module as a custom chip type module that is easy to assemble and disassemble, and to a relatively simple configuration. The present invention provides a luminance / color adjusting device and method of the LED display system in which the luminance adjustment step of the LED is adaptively expanded to 16,777,216 or more steps in order to adapt the surrounding environment to enable fine adjustment of the luminance.

To this end, the dot matrix of the R / G / B-color LED by the image display current from the constant current driving means for generating a constant image display current by the R / G / B-color image data provided from the outside in the present invention. An LED image display system having an LED dot matrix module for displaying an image by lighting a light, wherein the external R / G / B-color image data, an address signal as a display position information, and a shift clock are supplied. Data shift and datalatch on G / B-color image data, and pulse widths are varied with multiple levels of gradation based on luminance detection signals of R / G / B-color with respect to ambient illumination sensed from the outside. The image display agent for R / G / B-color which outputs to the constant current driving means by adjusting the brightness of the data latched R / G / B-color image data by a conversion control pulse to a plurality of levels of gradation. That is configured to include a module characterized.

Description

Apparatus For Controlling Color Level of Image Display System with Light Emitting Diode Array and method for controlling the same}

The present invention relates to a color adjusting device and a method of an image display system in which LED (Light Emitting Diode) elements are arranged in a dot matrix form. More specifically, the LED array constituting a large display board is considered in consideration of ambient illumination. The present invention relates to a color adjusting device of a dot matrix type video display system and a method thereof, which enable fine adjustment of a full color level.

As is well known, in the case of an image display system in the form of a dot matrix, three color LEDs (Light Emitting Diodes) generating colored light of red (R), green (G), and blue (B) display one color pixel. It is configured as a unit pixel display element for applying the color image data to the unit pixel display element in a state in which a plurality of LEDs constituting such a unit pixel display element are arranged in a dot matrix shape. Can be reproduced. Therefore, LED dot matrix modules with such a large number of LEDs are generally widely used as billboards or billboards for indoor or outdoor use, which require quite large screen reproduction.

Here, for such an LED dot matrix module, for example, when constructing a screen having an aspect ratio of 640 × 480, a total of 307,200 pixels (640 × 480) are required, and in order to display the plurality of pixels, 921,600 ( 307,200 × 3) R / G / B three-color LEDs are required. In the case of the LED image display system equipped with such a conventional LED dot matrix module, digital image data or analog form from an external image source is required. A main control device as a microcomputer device for receiving a video signal of a video signal or generating image data (video data) stored in its own memory means for screen reproduction, and driven by the video data from the main control device. It includes a current driving device for supplying current to each dot of the LED dot matrix module.

On the other hand, recently, the brightness of the video screen is increased in order to increase the use efficiency while increasing the visibility of the screen reproducibility considering the use of the LED dot matrix module for indoor or outdoor use or day / night time zone. Since it is required to adapt the environment adaptively, when the corresponding dot matrix module is used indoors, it is necessary to display the LEDs of each dot sequentially because it is necessary to display the display with relatively lower luminance than for outdoor use. The dynamic display method which turns on and off is adopted, which reduces the burden on the main control device and can simplify the related circuit. However, it is difficult to precisely control the luminance of each LED of each LED.

On the other hand, when the LED dot matrix module is installed for outdoor use, it is necessary to maintain a constant brightness even during the week so that the static display method is adopted to continuously light the entire LED. In the outdoor dot matrix module implemented by the display method, the luminance of each R / G / B constituting each pixel can be individually adjusted.

However, in the conventional LED image display system, the main control device and the current drive device provide a dot matrix module so that the main control device directly supplies an image signal to the current drive device to supply current for each dot of the LED dot matrix module. Since signal lines of a number proportional to the number of dots due to the aspect ratio of the wires are wired, the wiring becomes complicated and installation and management become difficult.

In addition, in the case of the main control device that generates predetermined video data, a modulation signal such as PWM (Pulse Width Modulation) method can be generated as an output signal of the video data. Increasing the number of systems not only increases the overall complexity of the system, but also increases the manufacturing and installation costs, as well as the complexity of the circuit board on which the main control unit and related elements are mounted. It becomes difficult to disassemble, so even in the case of an abnormal occurrence of a partial device, it is impossible to partially replace only the faulty device, so that it is impossible to properly cope with it, and the disadvantage of having to completely replace the entire circuit board is caused.

In addition, in order to individually adjust the brightness of each R / G / B LED constituting the dot matrix module of the LED display system, the internal configuration of the main control device becomes quite complicated, and the PWM processing to process the PWM signal accordingly. As the number of devices increases, there is a disadvantage that the overall hardware becomes complicated / large.

Recently, in order to extend the brightness control step up to 65,536 steps, a large number of calculations required for PWM processing can be processed in software through a CPU (Central Processing Unit) or a DSP (Digital Signal Processor) of the main controller. Or hardware to implement in real-time processing, but this results in an increase in the weight of the main control device, resulting in an error in the main control device that can not be replaced independently on the circuit board If so, there is a serious disadvantage of having to completely replace the entire system.

Accordingly, the present invention has been made in view of the above-described circumstances, and the form of a custom chip for easily assembling and disassembling the configuration of a display control device for processing image data for reproducing the LED dot matrix module is shown. It is an object of the present invention to provide a color adjustment apparatus for a dot matrix type image display system that can be provided as a module.

Another object of the present invention is an R-G / B display control device for display processing of R / G / B image data, which is easy to assemble and disassemble, and that R-display control module and G-display can independently process data. The present invention provides a color adjustment apparatus for a dot matrix type image display system that can be provided in the form of a control module and a B-display control module.

In addition, another object of the present invention is to expand the brightness adjustment step of the LED to more than 16,777,216 steps to adapt to the surrounding environment change by a relatively simple configuration, the color of the dot matrix type video display system to enable fine adjustment of the brightness To provide an adjustment device.

In addition, another object of the present invention is to expand the brightness adjustment step of the LED to 16,777,216 or more steps to adapt to changes in the surrounding environment by a relatively simple configuration to enable fine adjustment of the brightness color of the dot matrix type video display system To provide an adjustment method.

According to the color adjustment apparatus of the dot matrix type image display system according to the first embodiment of the present invention for achieving the above object, the constant image display by the R / G / B- color image data provided from an external image source LED image display system having a constant current driving means for generating a current and an LED dot matrix module for displaying an image by lighting a dot matrix of an R / G / B-color LED by an image display current from the constant current driving means. In the LED image display system; Data shift means for taking at least one color image data among R / G / B-color image data provided from an external image source and shifting it synchronously to a shift clock, and display position information for the at least one color image data; Decoding means for decoding an address signal to generate a latch clock signal for synchronizing a data latch of the color image data, and receiving color image data from the data shift means and synchronizing with a latch clock signal from the decoding means. A data latch means for data latching the data, a color luminance detection signal having detected luminance for the same color as at least one color image data latched to the data latch means by a peripheral illuminance detection value from the outside, and synthesized with a luminance clock signal Luminance control means for generating a variable clock pulse Variable clock generating means for generating a plurality of pulse signal strings having different pulse numbers and pulse widths, respectively, as a conversion control pulse in which the pulse width is varied to a plurality of gray levels by the variable clock pulses from the luminance control means. And generating a variable pulse output having luminance adjustment values according to the gradation degree of a plurality of stages by combining a plurality of pulse signal strings as conversion control pulses provided from the variable clock generating means with color image data from the data latch means. Provided is a luminance / color adjusting device for an LED image display system including an image display control module having a conversion control means for outputting to a constant current driving means.

According to the color adjustment apparatus of the dot matrix type image display system according to the second embodiment of the present invention for achieving the above object, the constant image display by the R / G / B- color image data provided from an external image source Dot matrix type image having a constant current driving means for generating a current and an LED dot matrix module for displaying an image by lighting a dot matrix of an R / G / B-color LED by the current for image display from the constant current driving means. In the display system, each module is composed of independent modules having custom chip shapes that can be assembled and disassembled, so that R / G / B-color image data provided from an external image source can be independently displayed for each color. The luminance of the R / G / B-color image data is multi-level in accordance with the luminance detection value of the R / G / B-color detected from the peripheral illuminance detection value. And a plurality of image display control modules for driving the constant current driving means by fine adjustment with each of the plurality of image display control modules; Data shift means for taking at least one color image data among R / G / B-color image data provided from an external image source and shifting it synchronously to a shift clock, and display position information for the at least one color image data; Decoding means for decoding an address signal to generate a latch clock signal for synchronizing a data latch of the color image data, and receiving color image data from the data shift means and synchronizing with a latch clock signal from the decoding means. A data latch means for data latching the data, a color luminance detection signal having detected luminance for the same color as at least one color image data latched to the data latch means by a peripheral illuminance detection value from the outside, and synthesized with a luminance clock signal Luminance control means for generating a variable clock pulse Variable clock generating means for generating a plurality of pulse signal strings having different pulse numbers and pulse widths, respectively, as a conversion control pulse in which the pulse width is varied to a plurality of levels of gradation by the variable clock pulses from the luminance control means. And generating a variable pulse output having luminance adjustment values according to the gradation degree of a plurality of stages by combining a plurality of pulse signal strings as conversion control pulses provided from the variable clock generating means with color image data from the data latch means. Provided is a color adjustment apparatus for a dot matrix image display system which includes a conversion control means for outputting to a constant current driving means in common.

According to the color adjustment method of the dot matrix type image display system according to the third embodiment of the present invention, in order to achieve the above object, the R / G / B-color image data provided from an external image source is applied to the shift clock. The data shifted R / G / B-color image data in synchronization with a latch clock signal generated by decoding the address signal as display position information of the R / G / B-color image data; And a luminance clock signal by receiving a luminance detection signal of an R / G / B-color generated corresponding to the color of the R / G / B-color image data from a peripheral illuminance detection value provided from the outside. And generate variable clock pulses, and vary the pulse widths for a plurality of pulse signal strings having different pulse numbers and pulse widths, respectively, by the variable clock pulses. Outputting as a ring control pulse, and synthesizing a plurality of pulse signal strings as the conversion control pulses with the data-latched color image data to generate a variable pulse output whose luminance is adjusted with a plurality of levels of gray scale, thereby providing an LED dot matrix module. Provided is a color adjustment method of a dot matrix type image display system in which a brightness of an image screen displayed on the image is adjusted in a plurality of levels of gradation.

According to the present invention made as described above, each of the R / G / B-color image data provided from an external image source by an R / G / B-color image display control module consisting of a separate module Independent color processing is performed for each color, and each of the R / G / B-colors has a 256-level gradation level by the luminance detection signal of the R / G / B color generated based on the ambient light intensity detection value. By adjusting the luminance of the image data, the luminance of the color display screen displayed on the LED dot matrix module can be finely adjusted to a gradation of 16,777,216 or more steps.

1 is a block diagram showing a configuration of a color adjusting device of a dot matrix type video display system according to an embodiment of the present invention;

2 is a circuit diagram illustrating in detail the internal configuration of the shift register and the data latch buffer shown in FIG.

3 is a timing chart for explaining a fine adjustment operation of luminance according to an embodiment of the present invention;

4 is a block diagram showing a configuration of a color adjusting device of a dot matrix type video display system according to another exemplary embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

2,2A, 2B, 2C: Image display control module, 4: Shift register,

6: decoder, 8: data latch buffer,

10: luminance control unit, 12: variable clock generation unit,

14: conversion control unit, 16: constant current drive unit,

18: Light Emitting Diode (LED) dot matrix module.

Hereinafter, an embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of the luminance / color adjusting device of the LED image display system according to the preferred embodiment of the present invention. In the device of the present invention, reference numeral 2 denotes R-data. (B) receiving color image data of any one of G-data or B-data and sequentially outputting the data according to an address signal as display position information of the color image data, and surroundings detected by the illumination sensor; An image display control module for performing data processing to adjust the luminance of the color image displayed on the screen up to 256 levels based on the luminance control information generated based on the detected value of the brightness.

Here, the image display control module 2 is provided with input and output connector terminals to be detachably connected to the external image supply source or related elements and the signal cable as well as to dedicate itself on the signal board. It is manufactured as a single module in the form of a custom chip that can be assembled and disassembled by connecting to a pin connector.

In addition, the image display control module 2 is separately added to the size of each module, such as 8 × 8, 16 × 8, 8 × 16, 16 × 16 according to the screen size of the LED dot matrix module 18 Not only is it possible to implement the circuit sufficiently, but also it can be designed without distinguishing the color of R / G / B, making module manufacture easier.

In the image display control module 2 shown in the same figure, reference numeral 4 denotes any one of predetermined color image data (ID; namely R-image data among R / G / B color image data provided from the outside). (B) a shift register which receives G-image data or B-image data) as 8-bit parallel data and shifts each color image data per pixel in synchronization with a shift clock SCLK, the shift register 4 Has the same number of register elements as the number of columns of the LEDs constituting the LED dot matrix module 18.

Here, an external image supply source for providing the color image data ID to the image display control module 2 may be a digital video tape recorder, a digital television, a video disc player, or a computer device capable of generating digital data. It is possible to employ any image storage medium (eg, CD-ROM, semiconductor memory device) capable of storing a large amount of video data or color character data produced in-house.

Further, reference numeral 6 receives an address signal ADR as display position information provided from the outside, that is, an address signal for sequentially latching each color image data by designating a display position for each column of the LED dot matrix. The decoder which decodes and generates the latch clock signals ACLK1 to ACLKm is shown.

Further, reference numeral 8 sequentially receives 8-bit color image data provided from the shift register 4 to each dot of the dot matrix in synchronization with the latch clock signals ACLK1 to ACLKm from the decoder 6. Represents a data latch buffer to latch correspondingly.

2 is a circuit diagram illustrating in detail the internal structure of the shift register and the data latch buffer shown in FIG. The elements S1 to Sn are configured to receive color image data ID and to be sequentially shifted by the shift clock SCLK, and a plurality of buffer elements having the same number of dots as the LED dot matrix module 18. L11 to Lnm latch the color image data ID shifted by the respective register elements S1 to Sn in synchronization with the respective latch clock signals ACLK1 to ACLKm from the decoder 6 ( However, n and m represent the number of pixels according to the rows and columns of the corresponding LED dot matrix module 18. When the LED dot matrix module 18 has a module size of 8 × 8, for example, n = 8, you have a number of m = 8, 16 × 16 In case of module size, it has n = 16 and m = 16. In case of module size of 16 × 8, it has n = 16 and m = 8. In case of module size of 8 × 16, n = 8, m = 16).

Here, in the color image data latched to the plurality of buffer elements L11 to Lnm, another frame of color image data may be shifted to the register elements S1 to Sn by the latch clock signals ACLK1 to ACLKm. Until the latch state lasts.

In FIG. 1, reference numeral 10 denotes the same color as the color image data ID of any one of R-image data, G-image data, or B-image data provided to the corresponding image display control module 2 from the outside. Color luminance detection signal IB (i.e., the amount of ambient brightness is sensed in eight steps through a sensor means such as an illuminance sensor, and the color luminance for the same color as the color image data ID for the detected value). The luminance control unit generates a variable clock pulse by combining the three-bit color luminance detection signal generated by detecting the signal with the luminance clock signal BCLK.

Here, the external illuminance sensor means for providing the color luminance detection signal IB to the luminance controller 10 digitizes the illuminance values detected around the LED dot matrix module 18 in eight stages, and digitizes them. Logic circuits of any manner and configuration may be employed for generating data on the R-color, G-color and B-color illuminance values based on the illuminance data.

Also, reference numeral 12 is variable in eight steps on the basis of the variable clock pulses for a plurality of pulse signals PA0 to PA7 that receive the variable clock pulses generated from the luminance controller 10 and have different pulse widths. As a variable clock generation unit that generates the converted conversion control pulses, the conversion control pulses PA0 to PA7 of the variable clock generation unit 12 output pulses having different pulse widths, respectively, as shown in FIG. In PA0, one pulse is generated in the second converted control pulse PA1, so that 128 pulses are generated for the last eighth converted control pulse PA7, and the pulse is shown in FIG. The converted control pulses PA0 to PA7 correspond to the control pulses taking one step out of eight steps in which the pulse width is converted based on the variable clock pulses from the luminance controller 10.

Further, reference numeral 14 receives an 8-bit color image data ID corresponding to one color from the data latch buffer 8 after the operation is enabled by the operation enable signal / OE. The conversion control unit generates a conversion pulse output in which luminance values are converted in 256 steps with the conversion control pulses PA0 to PA7 variably generated from the variable clock generation unit 12.

Here, the conversion control unit 14 converts the 8-bit color image data and the conversion control pulses PA0 to PA7 into " PA0 × ID0 + PA1 × ID1 + PA2 × ID2 + PA3 × ID3 + PA4 × ID4 + PA5 × ID5 + PA6 x ID6 + PA7 x ID7 ". The conversion pulse output according to the result of the synthesis results in" 0 "pulses when the bit of the color image data is" 0 ". In the case of 1 "," 1 "pulses generate" 2 "pulses when the bit is" 2 "and up to" 255 "pulses when the bit value is" 255 ". On the other hand, the conversion pulse output allows the pulse to be continuously repeated at a constant period until the value of the color image data latched in the data latch buffer 8 is changed to data of another frame to maintain a constant brightness. do.

In FIG. 1, reference numeral 16 denotes a conversion pulse output generated from the conversion control unit 14 of the image display control module 2 to the R / G / B for the LED dot matrix module 18. A constant current driver for generating a constant current in the LED dot of any color whose color is displayed by any one of the color image data (ID) of the color image data, wherein the LED is generated by the current generated from the constant current driver (16) The dot matrix module 18 adjusts the color luminance of 256 levels with respect to an image displayed on the screen by 256 levels of gradation.

Next, an operation according to an embodiment of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the image display control module 2 processes R-color image data among color image data of R / G / B, for example, RLED (Red Emitting) of the LED dot matrix module 18 having a module size of 8x8. An operation of displaying a light on a dot matrix according to a diode) will be described as an example.

That is, the shift register 4 of the image display control module 2 receives the R-color image data ID from the outside and synchronizes the shift clock SCLK to the number of columns of the LED dot matrix module 18. R-color image shifted to a plurality of register elements S1 to S8 of corresponding numbers, while shifted in column units by register elements S1 to S8 of the shift register 4 in the decoder 6. The address signal ADR is supplied as the display position information of the data ID and decoded to generate the latch clock signals ACLK1 to ACLK8 corresponding to each column.

Accordingly, the data latch buffer 8 transmits the R-color image data ID shifted column by column to the register elements S1 to S8 of the shift register 4 from the latch clock signal ACLK1. The latches are sequentially latched in synchronization with ˜ACLK8).

Meanwhile, the luminance controller 10 of the image display control module 2 detects luminance having 3 bits as a result of detecting the amount of brightness in 8 steps for the same R-color as the color of the R-color image data ID. The signal IB is supplied from an external illuminance sensor means and synthesized with the luminance clock signal BCLK to generate a variable clock pulse according to the result.

In this case, the variable clock generator 12 generates the first to eighth pulse signals PA0 to PA7 that periodically generate 1 to 128 pulses with different pulse widths, which are generated by the luminance controller 10. By generating the conversion control pulses as a result of varying the pulse width in eight steps by the variable clock pulses, the first to eighth pulse signals PA0 to PA7 are generated in the conversion control unit 14 as the conversion control pulses. .

Therefore, the conversion control unit 14 combines the R-color image data ID latched by the data latch buffer 8 with the first to eighth pulse signals PA0 to PA7 as the conversion control pulses. In addition, the R-color generates a conversion pulse output whose luminance is adjusted to a luminance value of 256 steps. The constant current driver 16 displays the R-color display of the LED dot matrix module 18 by the conversion pulse output. The LED matrix is turned on by driving a current in which the luminance value is adjusted in 256 steps.

As a result, the brightness of the LED matrix corresponding to the R-color of the LED dot matrix module 18 can be finely adjusted in 256 steps adaptively to the amount of brightness for the surrounding R-color.

Hereinafter, another embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 4 is a block diagram showing the configuration of the luminance / color adjusting device of the LED image display system according to another preferred embodiment of the present invention. In the device of the present invention, the first image display control module ( 2A) has the same configuration as the internal configuration of the image display control module 2 of FIG. 1 shown in accordance with one embodiment of the present invention, and R-color image data RD and G- input from the outside. When both the color image data GD and the B-color image data BD are supplied, only image data (for example, R-color image data RD) for any color is taken and synchronized to the shift clock SCLK. In addition, the data shift operation is performed synchronously with the latch clock signals ACLK1 to ACLKm generated by decoding the address signal ADR.

In addition, the first image display control module 2A has a luminance detection signal RB around the R-color supplied by an external illuminance sensor means and a luminance detection signal GB around the G-color. And a luminance detection signal (eg, an R-color luminance detection signal RB that detects luminance of the same peripheral color as any one of the color image data in a state where all of the surrounding luminance detection signals BB are supplied to the B-color). By taking only)) and combining with the luminance clock signal BCLK, the first to eighth pulse signals PA0 to PA7 whose luminance values are adjusted in 256 steps are generated.

Further, the first image display control module 2A combines the data latched color image data with the first to eighth pulse signals PA0 to PA7 so as to match any one color (for example, R-color). The conversion pulse output of which the luminance value is adjusted in 256 steps is generated to the constant current driver 16.

In the figure, the second image display control module 2B is input from the outside while having the same configuration as the internal configuration for the image display control module 2 of FIG. 1 shown in accordance with an embodiment of the present invention. Any one of which is not processed by the first image display control module 2A while receiving both R-color image data RD, G-color image data GD, and B-color image data BD. Latch clock signals ACLK1 to ACLKm generated by taking only image data (for example, G-color image data GD) for color and performing data shift synchronously to the shift clock SCLK and decoding the address signal ADR. ), The data latch operation is performed synchronously.

In addition, the second image display control module 2B has a luminance detection signal RB around the R-color supplied by an external illuminance sensor means and an luminance detection signal GB around the G-color. And a luminance detection signal (eg, a G-color luminance detection signal GB) that detects the luminance of the same peripheral color as any one of the color image data while all of the surrounding luminance detection signals BB are supplied to the B-color. By taking only)) and combining with the luminance clock signal BCLK, the first to eighth pulse signals PA0 to PA7 whose luminance values are adjusted in 256 steps are generated.

In addition, the first image display control module 2B combines the data latched color image data with the first to eighth pulse signals PA0 to PA7 so that the first image display control module 2B can be configured to any one color (for example, G-color). The conversion pulse output of which the luminance value is adjusted in 256 steps is generated to the constant current driver 16.

In addition, in the drawing, the third image display control module 2C has the same configuration as the internal configuration of the image display control module 2 shown in FIG. 1 according to one embodiment of the present invention, and is input from the outside. Data from the first and second image display control modules 2A and 2B while receiving both R-color image data RD, G-color image data GD, and B-color image data BD. A latch generated by taking only image data (e.g., B-color image data BD) for an unprocessed color and performing data shift synchronously to the shift clock SCLK and decoding the address signal ADR. The data latch operation is performed synchronously with the clock signals ACLK1 to ACLKm.

In addition, the third image display control module 2C has a luminance detection signal RB around the R-color supplied by an external illuminance sensor means and a luminance detection signal GB around the G-color. And a luminance detection signal (for example, a B-color luminance detection signal) that detects the luminance of the same peripheral color as any one of the color image data while all of the surrounding luminance detection signals BB are supplied to the B-color. BB)) is taken and combined with the luminance clock signal BCLK to generate the first to eighth pulse signals PA0 to PA7 whose luminance values are adjusted in 256 steps.

Further, the third image display control module 2C combines the data latched color image data with the first to eighth pulse signals PA0 to PA7 so as to match any one color (for example, B-color). The conversion pulse output of which the luminance value is adjusted in 256 steps is generated to the constant current driver 16.

On the other hand, when the first, second and third image display control modules 2A, 2B, and 2C each generate a conversion pulse output that combines luminance adjustment values according to the gray level of 256 levels, that is, "256 steps ( Luminance adjustment of R-color) x 256 steps (G-color luminance adjustment value) x 256 steps (B-color luminance adjustment value) = 16,777,216 steps ".

The first, second and third video display control modules 2A, 2B, and 2C are each provided with input and output connector terminals on the exterior of the first and second video display control modules 2A, 2B, and 2C. The second image display control module 2B is detachably connected to an external image source or related device via a signal cable, and the third image display control module 2B is connected to the first image display control module 2A via a signal cable. The image display control module 2C is connected to the second image display control module 2B through a signal cable. On the other hand, each module itself is to be manufactured as a single module in the form of a custom chip to be detachably connected to the pin connection connector allocated on the signal board.

Next, an operation according to another embodiment of the present invention made as described above will be described in detail with reference to FIG. 4.

First, the first image display control module 2A processes the R-color image data, the second image display control module 2B processes the G-color image data, and the third image display control module 2C. ) Will be described in detail with an example of the state determined to process the B-color image data.

That is, the first image display control module 2A receives R-color image data RD, G-color image data GD, and B-color image data BD from external image sources, respectively. The latch clock signal generated by shifting the data in synchronization with the shift clock SCLK only for the color image data RD, and then decoding the address signal ADR, which is the display position information of the R-color image data RD, The data is latched in synchronization with ACLK1 to ACLKm).

In that state, the first image display control module 2A detects the R-color luminance detection signal RB and G-color luminance from the outside generated by the illuminance detection value around the LED dot matrix module 18. R-color luminance detection signal RB which is supplied with signal GB and B-color luminance detection signal BB, respectively, and detects illuminance with respect to R-color in the same color as the corresponding R-color image data RD. ) Is combined with the luminance clock signal BCLK, and outputs as a conversion control pulse having a variable pulse width in eight steps with respect to the first to eighth pulse signals PA0 to PA7 as shown in FIG. .

Accordingly, the data latched 8-bit R-color image data RD is synthesized with the first through eighth pulse signals PA0 through PA7 to generate a converted pulse output with luminance adjusted in 256 gray levels. do.

At this time, the second image display control module 2B is configured to display R-color image data RD and G-color image data GD and B-color from the outside through the first image display control module 2A. The data latches are synchronized with the latch clock signals ACLK1 to ACLKm generated by decoding only the G-color image data GD among the image data BD and decoding the data shift and address signals ADR in synchronization with the shift clock SCLK. Let's go.

On the other hand, the second image display control module 2B receives the R-color luminance detection signal RB, the G-color luminance detection signal GB and B- from the outside through the first image display control module 2A. Only the G-color luminance detection signal GD is taken out of the color luminance detection signal BB, and is combined with the luminance clock signal BCLK and the pulse width of the first to eighth pulse signals PA0 to PA7 as a conversion control pulse. As a result, the first to eighth pulse signals PA0 to PA7 as the conversion control pulses and the G-color image data GD are synthesized to output the variable pulse output whose luminance is adjusted to 256 gray levels. The constant current driver 16 is generated.

In the third image display control module 2C, R-color image data RD, G-color image data GD, and B-color image data BD through the second image display control module 2B. ) Is supplied to take only the B-color image data BD and perform data shift and data latch.

Further, the R-color luminance detection signal RB, the G-color luminance detection signal GB, and the B-color luminance detection signal BB are supplied through the second image display control module 2B, and among them, B- As the first to eighth pulse signals PA0 to PA7 are generated as the conversion control pulses based on the color luminance detection signal BB, the data latched B-color image data BD and the first to second agents are generated. The eight pulse signals PA0 to PA7 are synthesized to output a variable pulse output having 256 gray levels to the constant current driver 16.

As a result, the constant current driver 16 has an R / G / B-color image whose luminance is adjusted to 256 gray levels from the first, second and third image display control modules 2A, 2B, and 2C, respectively. By synthesizing the variable pulse output according to the data and applying a current including a high-definition luminance adjustment value having a gradation of more than 16,777,216 steps to each R / G / B dot matrix of the LED dot matrix module 18, The luminance of the color display screen displayed on the corresponding LED dot matrix module 18 can be adjusted to a gray level exceeding 16,777,216 steps.

In the embodiment of the present invention made as described above, various modifications can be made without departing from the technical spirit without departing from the embodiments.

According to the present invention made as described above, an image display control device for providing color image data to an LED dot matrix module employing a color LED element of R / G / B, respectively, R-color, G-color and B In addition, each chip is manufactured as a single module in the form of a custom chip to perform data processing independently of each other, and the brightness adjustment value of the display image can be adjusted to more than 16,777,216 steps adaptively to the illuminance around the corresponding LED dot matrix module. As a result, the manufacturing cost of the module is greatly reduced, the wiring is simplified, and the assembly / disassembly is made relatively simple, so that the replacement of parts is easy and the installation cost is expected to be reduced. It has the advantage of being.

Claims (8)

Constant current driving means for generating a constant image display current by R / G / B-color image data provided from an external image supply source, and R / G / B-color by means of the image display current from the constant current driving means. In a dot matrix image display system having an LED dot matrix module that displays an image by lighting an LED dot matrix. The dot matrix image display system; Data shift means for taking at least one color image data among R / G / B-color image data provided from an external image source and synchronously shifting the shift clock; Decoding means for decoding an address signal as display position information for the at least one color image data to generate a latch clock signal for synchronizing a data latch of the color image data; Data latch means for receiving the color image data from the data shift means and synchronously data latching the latch clock signal from the decoding means; Luminance that generates a variable clock pulse by receiving a color luminance detection signal that detects luminance for the same color as at least one color image data latched by the data latch means at a peripheral illuminance detection value from the outside and synthesizing it with the luminance clock signal. Control Panel, Variable clock generating means for generating a plurality of pulse signal strings having different pulse numbers and pulse widths, respectively, as a conversion control pulse in which the pulse width is varied to a plurality of gradations by the variable clock pulses from the brightness control means; , By combining a plurality of pulse signal strings as conversion control pulses provided from the variable clock generating means with color image data from the data latching means, a variable pulse output having luminance adjustment values according to gradation levels of a plurality of levels is generated to drive the constant current. And a video display control module having a conversion control means for outputting the means. The apparatus of claim 1, wherein the image display control module comprises a single module having a custom chip form that can be assembled and disassembled. 2. The plurality of pulse signal strings of the variable clock generating means correspond to the first to eighth pulse signals each having the number of pulses from one pulse to 128, wherein the first to eighth pulse signals And a pulse width is varied by eight levels of gradation by the variable clock pulses. The brightness control value according to the combination of the first to eighth pulse signals according to the conversion control pulses and the 8-bit color image data in the conversion control means has gradation of 256 levels. A color adjusting device of a dot matrix type video display system. Constant current driving means for generating a constant image display current by R / G / B-color image data provided from an external image supply source, and R / G / B-color by means of the image display current from the constant current driving means. In a dot matrix image display system having an LED dot matrix module that displays an image by lighting an LED dot matrix. Each module is composed of independent modules with custom chip shapes that can be assembled and disassembled.They process data independently for each color of R / G / B-color image data provided from an external source. Multiple image display for driving the constant current driving means by fine-adjusting the luminance of the R / G / B-color image data to a plurality of gradations according to the luminance detection value of the R / G / B-color detected from the picture detection value Configure the control module, Each of the image display control modules; Data shift means for taking at least one color image data among R / G / B-color image data provided from an external image source and shifting it synchronously to a shift clock, and display position information for the at least one color image data; Decoding means for decoding an address signal to generate a latch clock signal for synchronizing a data latch of the color image data, and receiving color image data from the data shift means and synchronizing with a latch clock signal from the decoding means. A data latch means for data latching the data, a color luminance detection signal having detected luminance for the same color as at least one color image data latched to the data latch means by a peripheral illuminance detection value from the outside, and synthesized with a luminance clock signal Luminance control means for generating a variable clock pulse Variable clock generating means for generating a plurality of pulse signal strings having different pulse numbers and pulse widths, respectively, as a conversion control pulse in which the pulse width is varied to a plurality of levels of gradation by the variable clock pulses from the luminance control means. And generating a variable pulse output having luminance adjustment values according to the gradation degree of a plurality of stages by combining a plurality of pulse signal strings as conversion control pulses provided from the variable clock generating means with color image data from the data latch means. And a conversion control means for outputting to the constant current driving means in common. 6. The method of claim 5, wherein the plurality of conversion control pulses are respectively determined by the luminance detection signals of the R / G / B colors for the first to eighth pulse signal strings each having a number of pulses from one pulse to 128 pulses. R / G / B-color is made up of 8 levels of gradation so that the pulse width is variable, and the R / G / B-color image data has 256 R / G / B-colors respectively by the plurality of conversion control pulses. The brightness control device of the dot matrix image display system characterized in that the brightness is adjusted by the gradation step by step so that the color luminance on the LED dot matrix module is adjusted to the gradation level exceeding 16,777,216 steps. 6. The image display control module of claim 5, wherein the plurality of image display control modules take only R-color image data from the R / G / B-color image data and multiply the luminance by a conversion control pulse based on an R-color luminance detection signal. The first image display control module for adjusting and outputting the gray scale of the step; and taking the G-color image data only from the R / G / B-color image data, and converting the luminance by the conversion control pulse by the luminance detection signal of the G-color. A second image display control module for adjusting and outputting the gradation to a plurality of levels of gradation; And a third image display control module which adjusts the luminance to a plurality of levels of gradation and outputs the color. Synchronously shifting the data of the R / G / B-color image data provided from an external image source to the shift clock; Data latching the data shifted R / G / B-color image data in synchronization with a latch clock signal generated by decoding an address signal as display position information on the R / G / B-color image data; A variable clock pulse obtained by receiving a luminance detection signal of an R / G / B-color generated corresponding to the color of the R / G / B-color image data from a peripheral illuminance detection value provided from the outside and combining the luminance detection signal with the luminance clock signal. Generating and converting the pulse widths of the plurality of pulse signal strings having different pulse widths and pulse widths into gradation levels of the plurality of steps by the variable clock pulses, and outputting them as conversion control pulses; The video image displayed on the LED dot matrix module is generated by synthesizing a plurality of pulse signal strings as the conversion control pulses with the data-latched color image data to generate a variable pulse output whose brightness is adjusted with a plurality of levels of gradation. A method of adjusting the color of a dot matrix type image display system, characterized in that the brightness is adjusted to a gray scale of.