KR101191150B1 - Calibration apparatus for electric sign board weakening by time passed and circumstances in use - Google Patents

Abstract

PURPOSE: A calibrating apparatus of an electronic display board deteriorating by time passing and circumstances in use is provided to calibrate light emitting properties to maintain the quality of the electronic display board similar to the initial quality thereof by detecting deterioration causes. CONSTITUTION: A temperature and humidity sensor(110) is installed on the outside of an LED display board(105). The temperature and humidity sensor collects data about temperature and humidity during operating the LED display board. A calibration controller(120) includes a data memory, a time-based temperature and humidity average calculation unit and a daily data memory. An accumulation calculating unit calculates accumulation by adding up total use time according to the temperature and the humidity. [Reference numerals] (101) Image source; (102) Operation PC; (103) Controller; (104) Local controller; (105) LED display plate; (110) Temperature and humidity sensor; (120) Calibration controller

Description

Calibration Apparatus for Electric Sign Board Weakening by Time Passed and Circumstances in use}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for correcting an electric sign, and more particularly, to a device for correcting a sign of light, which is deteriorated due to use environment and time.

The development of video equipment and broadcasting technology has stopped the National Television Systems Committee (NTSC) broadcasting of low resolution and the commercialization of high definition, high definition HDTV broadcasting. It's time. In this trend, the electronic signboard is no exception and it is also true that the LED is used and compacted as a light emitting device of the electronic signboard.

However, if LED is concentrated to realize high resolution, it is necessary to increase the amount of heat generated, and the LED is mainly installed outdoors, so the characteristics of the LED are changed due to environmental effects such as ambient temperature and self-heating. Although shortening and display quality deterioration occur, the display is operating without special measures.

However, according to the following patent document, which the applicant has a patent, a technique for implementing a correction of an electric signboard has been published, but this patent measures the ambient temperature of the signboard while the sign is in operation to compensate for the difference in brightness according to the ambient temperature. As a device for maintaining a white balance, it will be said that there is a significant difference from the present invention developed in consideration of the LED characteristics of the display device deteriorated after long-term use in the temperature, humidity environment of the present invention.

Therefore, in order to meet the demands of high quality and high quality in the image implementation of the electronic display board, the LED display changes according to the environment of use, and the electronic display board correction is performed to maintain the quality similar to the initial state even if the electronic display board is used for a long time. There is an urgent need.

Patent No. 350306 “Display Balance White Balance Maintenance Device”

Accordingly, an object of the present invention is to solve the above-mentioned shortcomings, and by detecting the deterioration factors by prolonged use in consideration of the characteristic change according to the use environment of a light emitting diode (LED), which is a light emitting device, It is to calibrate to maintain the same quality as the initial installation of the signboard, and also to improve the signboard image quality as well as to extend the reuse period of the signboard, which can reduce industrial waste and the installation cost of the signboard by reducing the installation cost. To provide a device.

Display board correction apparatus of the present invention for achieving the above object, the temperature and humidity sensor installed on the outside of the sign board to collect data on the temperature, humidity during the operation of the sign; It is configured to be connected to the controller side of the signboard and corresponds to the reduction ratio when the brightness reduction ratio for the signboard is calculated based on data such as temperature, humidity environment obtained from the temperature, humidity sensor and cumulative time of signboard used in such environment. And a correction control unit configured to control the correction current to be applied to the controller to correct the reduced brightness of the electronic display board to maintain an initial state.

In addition, the correction control unit of the display board correction apparatus of the present invention for achieving the above object, the temperature and humidity collected for each time zone by the interval of data collection period set in advance in the operating computer having a watch dog circuit (Watch, circuit) A data memory for storing information primarily, a daily time zone temperature and humidity average calculating unit for calculating an average of time and humidity for each time zone inputted to the data memory by the operating computer, and an average value for each time zone set by the calculating unit. A daily data memory that stores the daily usage time for each temperature and humidity and stores the result in a daily unit; A cumulative calculation unit that calculates a cumulative cumulative total operation time for each temperature and humidity from an initial use time input to a daily data memory to a current use time, and calculates a brightness reduction ratio value of the electronic display board from the accumulation calculator; When the brightness of the electronic display is reached, the operating time is notified to the operating computer to notify that the calibration time has been reached, or the controller is controlled to correct the correction current value according to the brightness reduction ratio value. It is characterized by consisting of a current correction setting unit for automatically correcting the current.

In addition, in the signboard correction apparatus of the present invention for achieving the above object, the brightness reduction ratio of the signboard described in claim 3 is set to a value obtained by adding up the reduction ratio of the accumulated cumulative time for each temperature, humidity and divided by the number It features.

In addition, the display board correction apparatus of the present invention for achieving the above object, the current correction setting unit described in claim 4, so that the current value corresponding to the light deterioration ratio for each color corresponding to the cumulative time for each temperature, humidity A red, green, and blue current level setting unit for converting a ratio, and a binary code digit (BCD) data converting unit for converting a ratio converted from the current level setting unit to binary; The signal converted by the data converting unit is input to the LED driving IC of the LED through the controller is characterized in that the current is increased by the reduced luminous intensity ratio to operate the LED elements.

According to the present invention, in consideration of the characteristic change according to the use environment of the LED (Light Emitting Diode) as a light emitting element, the deterioration factors are detected in advance by prolonged use to correct the light emission characteristics, so that the quality similar to that of the initial installation of the display board is maintained. In addition, it is possible to reduce the industrial waste because it can extend the signboard reuse period as well as the image quality of the signboard, and also reduce the installation cost by extending the life of the signboard.

Figure 1a is a graph showing the measurement of the change in the characteristics of the LED brightness of the sign board when used for a long time in a high temperature dry environment,
Figure 1b is a graph showing the measurement of the change in the characteristics of the LED brightness of the sign board when used for a long time in a high temperature and high humidity environment,
Figure 2a is a graph showing the measurement of the change in the LED brightness of the sign board when used for a long time according to the high current at room temperature (常溫),
Figure 2b is a graph showing the measurement of the change in the LED brightness of the sign board when used for a long time according to the low current at room temperature (常溫),
3 is a block diagram of a correction device of an electronic display plate according to the present invention,
4 is a block diagram illustrating only the correction controller of FIG. 3;
5 is a block diagram showing in detail the configuration of the correction current setting unit of FIG.
6 is a diagram showing an example of an IC for driving an LED that is a light emitting body.
FIG. 7 is a diagram for setting the LED current of the driving IC of FIG. 6, and FIG. 7A is a graph showing reference resistance versus output current, and FIG. 7B shows a table of correction data versus output current.
8 is a flowchart showing that the correction control unit of FIG. 4 executes a correction operation.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the correcting device of the electric display plate deteriorated by the use environment and time elapse according to the present invention.

Figure 1a is a graph showing the measurement of the change in the LED brightness characteristics of the sign board when used for a long time in a high temperature and dry environment, Figure 1b is a graph showing the change in the LED brightness characteristic of the sign board when used for a long time in a high temperature and high humidity environment, Figure 2a is a graph showing the measurement of the LED brightness change of the display board when using for a long time according to the high current at room temperature (도), Figure 2b is a graph showing the measurement of the LED brightness change of the display board during long time use according to the low current at room temperature (常溫) It is a graph.

As shown in the drawing, when analyzing the graph characteristics of FIGS. 1 and 2, the higher the operating temperature and humidity, the lower the brightness of the LED of the signboard during long-term use, and it is remarkably decreased as the use time is over 1,000 hours. It can be seen that the difference between the (GREEN) and the blue (BLUE) LEDs occurs.

In particular, in the case of a blue LED, it was measured that the brightness was lowered to the first 50% or less after 5,000 hours using high temperature and high humidity (see FIG. 1B).

The red, green, and blue LEDs have different characteristics and their brightness decreases, indicating that the white balance may be broken due to long-term use of the signboard, and thus the correct color may not be realized. As the color temperature is lowered, the color changes to red, which means the color becomes darker than the initial installation.

In the graphs of FIGS. 1A and 1B and FIGS. 2A and 2B, when the display board is used at low temperature at room temperature, the image quality of the display board is stable for a long time, and it is preferable to use the display board at low temperature at room temperature. Since this is mainly installed outdoors, it is virtually impossible to use in such an environment.

The present invention is based on such a reality is to provide a signboard that implements a stable quality image even after long-term use by performing the signboard design and correction considering the temperature and humidity characteristics of Figures 1a and 1b.

FIG. 3 is a block diagram illustrating a correction device for an electric signboard according to the present invention, and FIG. 4 is a block diagram illustrating only the correction controller of FIG. 3.

As shown in the drawings, in the display of FIG. 3, the image source 101, the operating computer (PC) 102, the controller 103, the local controller 104, and the LED display panel 105 are configured for a conventional electronic display system. In addition, by adding the on-humidity sensor 110 and the correction control unit 120 in this configuration, the correction device 100 of the electronic display plate according to the present invention is implemented.

Since the image source 101, the operating PC 102, the controller 103, the local controller 104, and the LED display panel 105 are configured as a general display board, a detailed description thereof will be omitted and the core of the present invention will be omitted. Only the temperature and humidity sensor 110 and the correction control unit 120 which are technologies will be described.

The temperature and humidity sensor 110 is installed to be located outside the LED display panel 105 in which the LED is located, it is generally preferable to install the hole (Hole) in the case of the LED display panel 105. The use time command of the temperature and humidity sensor 110 is commanded through a separate power switch of the display board operating room or the use time command unit 106 of the operating computer 102, and the signal is input to the input unit 121 of the operating computer 102. It is input to the correction control unit 120 through. When the sensor is an analog signal, the input unit 121 is digitally supplied through the A / D converter. However, since the output signal of the on / humidity sensor 110 is a digital signal, the signal may be received as it is.

The temperature and humidity use time data is input to the data memory 122, and a watch dog circuit is added to the data memory 122 to be input for each time zone. Where the electronic board is installed varies depending on the country and the installation site, it is necessary to set a separate time for analyzing and classifying data, and these settings are inputted from the operating computer 102 and the daily time zone temperature and humidity The average calculating unit 123 obtains an average for each time zone commanded by the operating computer 102.

In desert climates and temperate climates where there is severe climate change, temperature and humidity averages are calculated every minute or 10 minutes, while regions with relatively low climate change, such as tropical, subtropical, and Mediterranean climate regions, use the average temperature and humidity over time. It is preferable to calculate it, but it can be freely operated by an operator. When using for more than 10 years, since the amount of data is large, it is preferable to set the time unit. Details will be described in the flowchart of FIG.

The average value for each time zone is stored in the daily data memory 124 on a daily basis, and the daily use time for each temperature and humidity is added up and stored.

The data stored in the daily data memory 124 are calculated by adding up the daily use time for each temperature and humidity again by the cumulative calculating unit 125. When the correction point is reached, the data is stored in the operating computer 102 through the correction notice unit 126. The correction time is notified by notifying that the correction time has been reached, or the correction current setting unit 130 performs automatic correction.

The calibration time can be set to 5,000 hours or 10,000 hours at the operating computer 102 and can be confirmed by the monitor of the operating computer 102.

5 is a block diagram illustrating in detail the configuration of the correction current setting unit of FIG. 4.

As shown in the drawing, FIG. 5 illustrates the correction current setting unit 130 of FIG. 4 in detail by the temperature and humidity in the red, green, and blue current level setting units 321 to 323. Convert the ratio to increase the current value corresponding to the brightness deterioration ratio for each color corresponding to the cumulative usage time, and this ratio is converted to binary in the BCD data conversion unit 324 and transmitted to the controller 103 and the local controller ( The LED is input to the LED driver IC 325 via 104 and the electric current by the lowered brightness ratio is increased to operate the LED of the LED display panel 105 so that the lowered LED brightness is corrected to the initial state.

FIG. 6 is a diagram showing an example of an IC for driving an LED which is a light emitter. FIG. 7 is a diagram for setting the LED current of the driving IC of FIG. 6, and FIG. 7A is a graph showing a reference resistance versus an output current. 7B shows a table of correction data versus output current.

As shown in the drawing, the LED driving IC 325 controls the brightness by a pulse width modulation (PWM) method and the LED current is operated with a constant current, and the maximum output current (R) is set by the resistance of the R _REF terminal, As shown in Fig. 7A, the resistance is set by the reference resistance versus the output current graph. The LED current setting should be set in consideration of the climate of the location where the LED display panel 105 is to be installed and the period of use of the LED display panel 105.

For example, in Korea, when the humidity and temperature are high from June to August, the daily operating time is 10 hours, and the use period of the signboard is 10 years. same.

       High Temperature / Humidity Hours of Use: Daily operating time 10 X 90 days X 10 years = 9,000 hours. Therefore, when setting the current, it is desirable to set the current in consideration of graph characteristics after using about 5,000 hours or 9,000 hours.

For example, suppose that the current is set based on a 5,000-hour graph. The red current level setting is 110% of the initial brightness of the display board, the green current level setting is 125%, and the blue current level setting is 155. Set the LED current in%.

That is, it means that the current is increased and set as much as the brightness decreases during the life target period. Modern ICs that drive LEDs can change the drive current of the LEDs with global brightness control or LED Dot Correction.

FIG. 7B is a table of current values changed when the correction data is 7 BIT and can be changed in step 127. In other words, if the brightness of the LED required for the first time is luminous intensity at the current value of 10 mA, the resistance is set to be 15.5 mA current value of 155% for the blue LED, and the correction data for the first use of the display board. Is set to 1010010, which is about 82 of 127 steps, and operates at 10mA.When 5,000 hours is corrected, the correction data is corrected to binary 1111111 to increase the current to 15.5mA. It can be operated as a bright display board.

The above is an example, and the actual ratio calculation needs to calculate the ratio by combining the usage time for each temperature and humidity. The actual ratio is much more complicated than the simple calculation above. It is essential that these current settings and corrections are set differently depending on the life of the signboard and the environment of use.

FIG. 8 is a flowchart showing correction performed by the correction control unit 120 of FIG.

Commands of the operation step 11 and the use time setting step 10 of the temperature and humidity sensor are commanded through a separate power switch of the display board operating room or the use time command unit 106 of the operating computer 102 (FIG. 3 and 4).

Such temperature and humidity use time data are input to the data memory 122, as shown in FIG. A watch dog circuit is added to the data memory 122 to be input for each time zone. Where the electronic board is installed, the use environment is very different depending on the country and the installation site, so it is necessary to set a separate time for analyzing and classifying the data. These settings can be input from the operating computer 102 of FIGS. 3 and 4. To make it work. The daily time zone temperature and humidity input to the data memory 122 of FIG. 4 are averaged for each time zone commanded by the operating computer 102 by the average calculator 123. For example, in desert climates or temperate climate countries where climate change is severe, such as in steps 12 to 15, temperature and humidity averages are calculated in units of minutes or 10 minutes, and in areas with relatively low climate change, such as tropical, subtropical, and Mediterranean. It is desirable to calculate the average temperature and humidity for each time zone afterwards, but it can be freely operated by the operator. If it is used for more than 10 years, it is preferable to set the time unit.

In this way, the average value for each time zone is stored in the daily data memory 124 shown in FIG. 4 on a daily basis, and step 16 in which daily usage time for each temperature and humidity is added and stored is performed. By counting the use time (step 17), it is passed through the step 18 of judging whether or not the LED brightness of the sign board for the correction period, or return to step 17 again to ask the use time of the LED sign, If the LED brightness needs to be corrected, the data stored in the daily data memory 124 is accumulated by the cumulative calculation unit 125 (see FIG. 4) again by adding the daily use time for each temperature and humidity step 19 and the LED. After calculating the correction values for red, green, and blue colors (20), the correction notification unit 126 (see Fig. 4) is notified to the operating computer of the correction time (step 22), indicating that the correction time has been reached. (Step 23) to automatically calibrate It said shop, or (step 22), and (see Fig. 4) the current correction setting unit 130 can be subjected to automatic calibration of the light intensity of the LED (step 22). In the above-described correction time, the operating computer 102 may be randomly set to 5,000 hours or 10,000 hours, etc., and may be confirmed by a monitor of the operating computer 102.

The present invention is to compensate for the deterioration factors by prolonged use in consideration of the characteristic change according to the use environment of the LED (Light Emitting Diode) as a light emitting device to correct the luminous characteristics, so as to maintain the quality similar to the initial installation of the display board In addition, it is a very useful invention that can reduce the industrial waste and the installation cost by extending the life of the signboard, as well as the image quality of the signboard can be extended.

100: display board correction control device 101: video source
102: operating computer (PC) 102: controller
104: local controller 105: LED display plate
110: temperature, humidity sensor 120: correction control unit

Claims (4)

delete A temperature and humidity sensor installed outside the billboard to collect data on temperature and humidity during operation of the billboard; and
Data memory for storing the temperature and humidity information collected for each time zone according to the data collection period interval set in advance in the operating computer having a watch dog circuit, and input into the data memory in the operating computer Daily time memory that calculates the average of temperature and humidity for each time zone Wow; A cumulative calculation unit that calculates a cumulative cumulative total operation time for each temperature and humidity from an initial use time input to a daily data memory to a current use time, and calculates a brightness reduction ratio value of the electronic display board from the accumulation calculator; When the brightness of the electronic display is reached, the operating time is notified to the operating computer to notify that the calibration time has been reached, or the controller is controlled to correct the correction current value according to the brightness reduction ratio value. A device for correcting a signboard that is deteriorated by the use environment and time elapsed, including a correction control section including a current correction setting section for automatically correcting a current.  The display panel of claim 2, wherein the brightness reduction ratio of the signboard is set to a value obtained by adding up a reduction ratio of the accumulated cumulative time for each temperature and humidity and dividing the sum by the number thereof. Compensator. According to claim 3, The current correction setting unit, Red, Green, Blue current level setting of the display board to convert the ratio to increase the current value corresponding to the light intensity reduction ratio for each color corresponding to the cumulative time for each temperature, humidity And a BCD (Binary Code Digit) data converting unit for converting the ratio converted by the current level setting unit into binary,
The signal converted by the BCD (Binary Code Digit) data converter is input to the LED driving IC of the LED through the controller to increase the current as much as the lowered brightness ratio to operate the LED elements A device for correcting an electric signboard that is degraded by environment and time.

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