KR20080066206A - Method and device to measure optical properties of led lighting - Google Patents

Abstract

An apparatus and a method for measuring optical properties of an LED are provided to simplify the measurement of the optical properties by computerizing spectrums corresponding to light having at least two colors. An apparatus of measuring optical properties of an LED(Light Emitting Diode) comprises the step of emitting light of the LED by applying power to a LED package(40) having at least two color LEDs. Spectrum of light having at least two colors is obtained through a spectroscope(10) and then transmitted to a computer. At least one optical property of maximum wavelength, main wavelength, luminosity, intensity radiation, color temperature, color rendering index, brightness and color coordinates for the transmitted spectrum of light is calculated.

Description

METHOD AND DEVICE TO MEASURE OPTICAL PROPERTIES OF LED LIGHTING

1 is a structure and spectrum distribution diagram of the LED package according to the present invention

2 is a measurement item and accuracy chart according to the present invention

3 is a configuration diagram of the LED photometric measuring apparatus according to the present invention

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

10: spectrometer

20: X axis slide

30: Y-axis slide

40: LED package

The present invention relates to a light measuring method and apparatus for an LED lighting device, and more particularly, to the LED package having two or more colors of the LED package consisting of two or more colors by measuring all the LED light at a time by spectrum analysis It relates to a device that analyzes light characteristics separately for each color as well as for the whole.

In modern times, a display method using a conventional light emitting device or an electron gun has been mainly used.

However, with the development of LED-related technology, the marketability is increasing as LED technology is adopted in the majority of display area with continuous development of new technology, and this technology development requires various kinds of LED-related measuring equipment. .

It is a device for measuring LED characteristic that is used until now, and it is a device for measuring the LED directivity angle.In recent years, among the light characteristics of LED, luminance, color coordinate, peak wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature, color rendering index There is a need to measure color reproducibility.

However, since the devices and methods used to date use a method of separately measuring LEDs of each color included in each package, for example, LEDs having two colors are attached to one LED package. If it is, the light is measured by applying power to one LED to measure light characteristics, and then applying the power to another LED to emit light, and then measuring the light characteristics.

However, this method does not basically reflect the characteristics of the LED, the cause is that the LED has a constant distribution of light characteristics only after a certain time after the power is applied, so the problem of having to wait for that time In addition, LEDs that are widely used currently use three colors such as red, green, and blue, so it must take much time to evaluate LED products.

By the way, if you look at the LED package, which has about 500 to 1000 attachments and each LED package contains three colors of four LEDs, one red, two green, and one blue, 1500 to 3000 for each color Since the LED must be measured, it takes at least three times as much time as the simultaneous measurement, resulting in an increase in overall costs.

Therefore, in order to solve this problem, the present invention proposes a method for analyzing the characteristics of each color by measuring two or more colors simultaneously and an apparatus for achieving the same.

The present invention relates to a light measuring method and apparatus for an LED luminaire, and more particularly, to a total of two or more colors by performing spectroscopic analysis by measuring all the LED light at a time for an LED package having two or more colors. The present invention relates to a method and apparatus for separately analyzing optical characteristics and optical characteristics of each color.

An object of the present invention is to measure the overall optical characteristics and characteristics of each color, namely the highest wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature, color rendering index, color reproducibility In order to solve the problem of the existing device by extracting the brightness, color coordinate values, and the like.

In order to achieve this, the present invention provides a method for measuring light of an LED lighting device, in the method of measuring light of an LED lighting device, in order to measure optical characteristics of each color of an LED package having two or more colors at once, Installing the light on the measuring device and applying power to emit LEDs; spectroscopically transmitting light having two or more colors using a spectrometer to a computer; and transmitting the transmitted spectroscopic light to a computer. And calculating one or more of the highest wavelength, dominant wavelength, luminosity, radiance, half width, color temperature, color rendering index, color reproducibility, luminance, and color coordinates of the computer in total or for each color. It is characterized by a device.

Hereinafter, the configuration and structure of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the features of the present invention, one red (RED), two green (Green), one blue (BLUE), a total of four LEDs constitute a package.

Although the characteristics of the light emitting diode (LED) packages of the three colors are conventionally measured for each color separately, in the present invention, power is simultaneously applied to the LEDs of the three colors and the entire light is measured at once. Afterwards, spectroscopic analysis is performed to calculate the characteristics of each color by dividing the wavelength region for each characteristic value and each color.

The three color LEDs have a spectral distribution for each color as shown in FIG.

When three colors of LED are emitted and measured simultaneously, each spectrum is measured by overlapping, and the overlapping spectrum is classified into three colors of spectrum and analyzed for each spectrum to calculate various optical characteristics.

In general, the spectrums of LEDs composed of red (R), green (G), and blue (B) can be separated from each color by simply dividing the wavelength range.

That is, by applying power to the LED assembly having a variety of colors at the same time to emit light, by performing a spectroscopic analysis by measuring the light emitted from the emitted LED assembly, it is possible to extract the characteristics of each color.

Figure 2 illustrates each feature measured through the photometric method and apparatus for the LED lighting device produced through the present invention, in the case of luminance accuracy is 5% error range, color reproducibility 0.1% error range , And the error range of color coordinate is about 0.002.

These accuracy, resolution, and measurement ranges are stable enough to measure the characteristics of a ready-made product, to check quality, to measure the LED's ability as a package, and to test the reliability of each LED unit using spectral analysis. That means you can show the result.

Figure 3 is a light measuring device for the LED lighting device devised through the present invention, when classified by function can be classified into three categories.

The first is a spectroscope 10 for spectroscopy of the integrated optical characteristics of the LED luminaire, the next is an X-axis slide 20 and a Y-axis slide 30 which can move the spectrometer freely in a planar state. The spectrometer can be classified into a computer with a built-in program that calculates the overall optical characteristics and the optical characteristics of each color according to a formula and presents the results.

In addition, the measured characteristic value of each color is to perform the function of printing in various forms according to the needs of the user of the device includes a function for providing in a format such as report submission or presentation presentation.

Looking at the operation relationship of the device, for example, an LCD TV uses an LED BACK LIGHT UNIT (LED BLU), and after installing the LED BLU in the device, the LED packages and spectrometers mounted on the LED BLU module When the optical measuring device is operated by adjusting the distance of the spectrometer at the starting position of the optical characteristic measurement and applying the power to the LED package to emit all the light, the spectroscope moves to perform the measurement for each package. The description of the LED BLU as an example here means that the method and apparatus of the present invention can be applied to various light emitters.

The spectroscopic results are transmitted to the computer as digital values for analysis. Basically, the formula for measuring luminance is as follows.

The characteristics of the equation for measuring the luminance means that the characteristics can be measured for each color according to the area for integration, and the luminance is calculated for each color according to the setting area of the numerical value suggested in the above formula. will be.

[Lambda] s in the above formulas represent an integral starting region and λe representing an integral ending region. For example, when λs is 360 and λe is 500, spectral analysis is performed on blue, and λs is 500 and λe is 580. In this case, spectral analysis is performed on green, and λs is 580, and λe is 830. Therefore, spectral analysis is performed on red, where k is a constant indicating the highest spectroscopic efficiency, and I (λ) is measured. The spectrum, and y (λ), refers to the spectroscopic luminous function.

When spectrum analysis is applied by applying the above formula, it means that simultaneous measurement, total analysis, and individual analysis for each color are possible for various colors.

In order to use the above formula, it is most preferable to perform the LED package having two or more colors whose spectrum can be separated because the wavelengths of each color do not overlap. However, in some cases, even if some overlap with each other, a separation algorithm is used. It is detachable.

In addition, the above-described method may be calculated and applied in various cases when measuring not only luminance but also other characteristics.

The time required to measure each package through the device can be measured in less than 0.1 seconds. Even if a large amount of packages is measured, if the packages are arranged to measure continuously, the optical measurement of all packages can be automatically and quickly measured. If the position of the packages can be known using the vision, the position of the package can be obtained using the vision and then automatically moved to the position to specify the optical characteristics.

The area that can be measured by the above apparatus and method is possible for all areas that can be measured by existing equipment that can measure the light characteristics of a LED package having a single color. Because they are measured separately, the maximum wavelength, dominant wavelength, luminous intensity, radiance, half-width, and when the object is shining with visible light, if the color looks like the color that a black body radiates at a certain temperature, the temperature of the black body It is possible to measure the color temperature, color rendering index, color reproducibility, luminance, and color coordinate values that define the temperature as the object temperature. In general, good color reproducibility means that more colors are expressed in the CIE color coordinate system. I will.

In general, the LED lighting device optical measuring method and device is to install the LED package in the optical measuring device and apply power to the LED package in order to measure the optical characteristics of each color of the LED package with the LED having two or more colors at once. Emitting light; spectroscopically transmitting light emitted from two or more LEDs having two or more colors using a spectrometer to a computer; and transmitting the transmitted spectroscopic light to the computer as a whole or And calculating at least one of the highest wavelength, dominant wavelength, luminance, radiance, half width, color temperature, color rendering index, color reproducibility, luminance, and color coordinates for each color, wherein the apparatus for achieving the method includes: In order to measure and analyze the optical characteristics of LED packages with two or more LEDs with more than one color at a time, an LED package can be installed and powered on. A slide configured to move on the X-axis and Y-axis at the top of the mount to move to the position of the LED package, a spectroscope installed at the bottom of the slide to spectrograph the emitted LED package light, By analyzing the LED package and receiving the results classified for each wavelength, it is equipped with a formula that can calculate one or more of the highest wavelength, dominant wavelength, luminance, radiance, half width, color temperature, color rendering index, color reproducibility, luminance, and color coordinates. There are features that comprise a computer.

In the case of using the method and apparatus devised through the present invention, the LED package having two or more colors can be measured in one measurement for the whole and each color, that is, the highest wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature and color rendering. It has the effect of extracting index, color reproducibility, luminance and color coordinate values.

What has been described above is only one embodiment according to the present invention, and the present invention is not limited to the above-described embodiments, and the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (3)

In the LED lighting device optical measurement method, In order to measure the light characteristics of each color of the LED package of two or more colors at once, Installing the LED package in an optical measuring device and applying power to emit LEDs; Spectroscopy two or more colors of light with the emitted LED package using a spectrometer to a computer; Calculating at least one of the highest wavelength, dominant wavelength, luminosity, radiance, half-width, color temperature, color rendering index, color reproducibility, luminance, and color coordinates of the transmitted spectroscopic light by a computer or for each color; Light measuring method for an LED lighting device, characterized in that configured to include. 2. The method of claim 1, wherein the LED is composed of two or more LEDs emitting different colors, so that the package has two or more colors. In the LED lighting device optical measuring device, in order to measure and analyze the light characteristics of the LED package having two or more colors at once, A mounting table configured to apply power by installing an LED package; A slide movable on the top of the mount to move to the position of the LED package by moving in the X-axis and the Y-axis; A spectrometer installed at the bottom of the slide to spectroscopic emitted light of the LED package; By spectroscopically analyzing the LED package emitted by the spectrometer, one or more of the highest wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature, color rendering index, color reproducibility, luminance, and color coordinates can be calculated. A computer with built-in formulas; Light measuring device for an LED lighting device, characterized in that configured to include.

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