KR100882272B1 - Method and device to measure optical properties of led package - Google Patents

Abstract

The present invention relates to a method and an analysis device for analyzing the optical characteristics of a multicolor LED package, and simultaneously emitting all the LEDs constituting the multicolor LED package, and then measuring the emitted light using a spectrometer and measuring the color according to each color. It is characterized by obtaining a spectrum separated by wavelength, and simultaneously analyzing the optical characteristics of each LED and the mixed optical characteristics according to the spectrum separated by each color. It is possible to obtain accurate analysis results by reducing costs and keeping the same measurement conditions.

LED Measurement, Optical Properties, Multicolor, LED Package, Spectrometer

Description

Optical Characteristic Analysis Method and Analysis Apparatus of Multicolor LED Package {METHOD AND DEVICE TO MEASURE OPTICAL PROPERTIES OF LED PACKAGE}

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

2 is a table of metrics and accuracy in accordance with the present invention.

3 is a block diagram of an optical characteristic analysis 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 an optical characteristic analysis method and an analysis apparatus of a multi-color LED package, and more particularly, to emit light of the LED package having two or more colors at the same time, and then to measure the emitted light by spectroscopy according to each color The present invention relates to an analysis method and an analysis apparatus capable of simultaneously analyzing color and overall optical characteristics of each LED according to a spectrum separated by wavelength.

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 the LED directivity angle which is used up to now.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 for measuring color reproducibility.

However, the devices and methods used to date have used a method of separately measuring the LEDs of each color included in each package. For example, if a LED package with two colors is attached to one LED package, power is applied to the LED of one color to emit light, and then the optical characteristics are measured. After applying and emitting light, it is made to measure the optical properties.

However, this method basically does not accurately reflect the optical characteristics of the LED, the cause of the LED is because the distribution of the optical characteristics of the LED only after a certain period of time after applying the power has to wait for that time There is a problem, and since the LED which is widely used uses three colors such as red, green, and blue, it must take much time to evaluate LED products.

By the way, if you look at the LED package with about 500 to 1000 attached and each LED package contains three colors of 4, 1 red, 2 green, and 1 blue, you can see 1500 to 1 Since 3000 LEDs have to be measured, it takes at least three times as much time as the simultaneous measurement, and there is a problem of increased 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 lighting device, by performing a spectroscopy to measure the optical properties of all the colors at once for the LED package having two or more colors, having two or more colors The present invention relates to a method and apparatus for simultaneously analyzing the overall optical characteristics and optical characteristics of each color for an LED package.

An object of the present invention is to measure the overall optical characteristics and optical characteristics of each color, that is, the highest wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature, color rendering index in one measurement of the LED package having two or more colors In order to solve the problem of the existing apparatus by extracting color reproducibility, luminance, color coordinate values, and the like.

In order to achieve this, the optical characteristic analysis method of the multicolor LED package according to the present invention is a method of analyzing the optical characteristic of the multicolor LED package, and simultaneously emits all the LEDs constituting the multicolor LED package and spectroscopy the emitted light. Measuring and obtaining a spectrum separated for each wavelength according to each color; And simultaneously analyzing the optical characteristics of each LED and the mixed optical characteristics of each LED according to the spectrum separated for each color.
In addition, the optical characteristics are characterized in that at least one of the highest wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature, color rendering index, color reproducibility, luminance, color coordinates.
In addition, the optical characteristic analysis device of the multi-color LED package according to the present invention comprises: a mounting table for installing the multi-color LED package; A slide movable on the top of the mount to move to the X-axis and the Y-axis, respectively, to move to the position of the multicolor LED package installed on the mount; A spectrometer installed at the bottom of the slide to spectroscopic light emitted from the LED package for each wavelength; The program that can calculate 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 Characterized in that it comprises a computer.

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

FIG. 1 is a diagram illustrating the characteristics of the present invention, in which one red, two green, and one blue one LEDs constitute a package. It is shown. In the following description, an LED having two or more different colors in one LED package is referred to as a 'multicolor LED package'.

In order to analyze the characteristics of the LED package of the three colors (R, G, B), conventionally measured the optical properties for each color separately, in the present invention, power is applied to the LEDs of the three colors at the same time, After measuring the entire light at a time, the spectroscopic analysis is performed to calculate the characteristics of each color based on the overall optical characteristics and the spectrum divided by wavelength for each color.

As shown in FIG. 1, the three-color LEDs show a spectral distribution separated by wavelength according to each color.

When three colors of LED are simultaneously emitted and measured, each spectrum is separated and measured, and each of the separated spectrums is analyzed to calculate various optical characteristics for each color.

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 package having a variety of colors at the same time, and emit light, by measuring the light emitted from the light emitting LED package to perform the spectroscopic analysis can be extracted for each color feature.

Figure 2 illustrates the characteristics of each optical characteristic measured by the optical characteristic analysis method and analysis device of the multi-color LED package invented through the present invention, in the case of luminance accuracy is 5% error range, color The reproducibility shows an error range of 0.1% and the color coordinate error range of 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.

3 is an optical characteristic analysis apparatus of a multi-color LED package devised through the present invention, which can be classified into three types.

Spectroscope 10 for spectroscopy light of the multi-color LED package 40, X-axis slide 20 and Y-axis slide 30 configured to move the spectroscope in plane, LED package according to the spectra spectroscopically through the spectrometer It 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 certain formula and presents the result.

In addition, the optical properties of the measured color 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 characteristic analyzer 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 spectrograph moves and performs 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 that can be separated from each other because the wavelength of each color does not overlap, but sometimes it is necessary to use a separation algorithm even if some of them overlap each other. 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 location of the packages can be known using the vision, the optical properties can be specified by automatically moving to the corresponding location after securing the location of the package using the vision.

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 optical characteristics of a single color LED package, even though there are two colors, each color through spectrum analysis. Because it is measured separately, the maximum wavelength, dominant wavelength, luminous intensity, radiance, half-width, and when the object shines with visible light, the color looks like the color that the black body of a certain temperature radiates. Given that the temperature is the same as the temperature of the object, we can measure the color temperature, color rendering index, color reproducibility, luminance, and color coordinate values that define the temperature as the temperature of the object, where color reproducibility refers to the area of the triangle formed by the RGB color coordinates. In general, good color reproducibility means that more colors are represented in the CIE color coordinate system. I will.

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According to the present invention, the multi-color LED package having two or more colors with only one measurement, the optical characteristics of the LED package as a whole and each color, that is, the highest wavelength, dominant wavelength, luminous intensity, radiance, half-width, color temperature, 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 embodiment, and as claimed in the following claims, the present invention belongs without departing from the gist of the present invention. 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)

delete delete In the optical characteristic analysis device of a multi-color LED package, Mounting platform for installing multicolor LED package; A slide movable on the top of the mount to move to the X-axis and the Y-axis, respectively, to move to the position of the multicolor LED package installed on the mount; A spectrometer installed at the bottom of the slide to spectroscopic light emitted from the LED package for each wavelength; The program that can calculate 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 computer; Optical characteristic analysis device of a multi-color LED package characterized in that comprises a.

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