JPH11103094A - Light-emitting diode measuring selecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a calibration error and dispersion among appliances, and to measure a visible-light whole region, by classifying the system color of an illuminant color on an xy chromaticity diagram by setting a range required for measurement and selection by multipoint xy coordinates. SOLUTION: A classifying means 11 classifies the luminescent color of the LED on the basis of the coordinate point of the luminescent color of the LED displayed on the xy chromaticity diagram of a display means 14, and a classifying output is emitted from a classifying output means 12 by a signal from the classifying means 11, and displayed to the display means 14. That is, the difference of colors (such as bright red, extremely thin blue, etc.,) considered by putting a hue and a saturation as separate attributes to lightness and luminance together is displayed on the diagram as different coordinate points by setting and sorting a range required for measuring and selecting the system color name of an illuminant color on the xy chromaticity diagram by multipoint xy coordinates by the classifying means 11, and the system color of the illuminant color can be parted and classified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is based on the practical use of red, green and blue primary colors of LEDs, especially blue, and it is essential to measure the main wavelength of a light emitting diode, the excitation purity and the system color classification of light source colors. The present invention relates to a versatile light-emitting diode measurement / selection device that requires simultaneous measurement over the entire visible light range, can accurately detect and classify light source colors, and is versatile.

[0002]

2. Description of the Related Art Conventionally, in order to measure and select a light source color of a light emitting diode (hereinafter referred to as an LED), an angle from a white point on a chromaticity diagram (see FIG. 2) is measured and "color tone and stimulus purity" are measured. The optical receiver is a combination of several types of optical filters so that the spectral sensitivity characteristic approximates the color matching function.

[0003]

The feature of this method is that the number of sensors can be reduced to three, so that the size and the price can be reduced. However, the disadvantage is that the spectral sensitivity is completely reduced to a color matching function. Since they cannot match, an absolute value error occurs.
For this purpose, the relative values are used. As a result, even if the same sample is measured, a measurement error occurs between the devices, and calibration is performed periodically using a reference LED within a range necessary for the measurement classification. Optical filter variation, calibration error,
In recent years, variations among devices have become a greater problem than ever due to the development of light-emitting diodes for green, blue-green, blue, and white.

Accordingly, an object of the present invention is to provide a light emitting diode measuring and sorting apparatus which eliminates calibration errors and variations between instruments, has high reliability, and is capable of measuring the entire visible light range.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a spectral detector that integrates a spectroscope for splitting light emitted from a light emitting diode and a photodetector, Analyze the light spectrally detected by this spectral detector,
A spectrum analysis means for displaying an xy chromaticity diagram on a display means, and a range required for measuring and sorting the system colors on the xy chromaticity diagram displayed on the display means by the multi-point xy coordinates by the spectrum analysis means. Classifying means for setting and classifying, and control means for classifying the coordinates of the light emitting color of the light emitting diode on the xy chromaticity diagram by the classifying means and controlling the light emitting color of the light emitting diode so that measurement and selection are possible. The light emitting diode measuring and sorting apparatus is characterized by comprising:

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a light emitting diode measuring and sorting apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a system block diagram of a light emitting diode measuring and sorting apparatus according to the present invention. As shown in FIG. 1, a light emitting diode (LED) 2 captures light emitted from a light emitting diode (LED) 2. A fiber input optical system 6 composed of an optical fiber tip 3 for transmitting light and an optical fiber 5 for transmitting light captured by the optical fiber tip 3 is formed. The rear end of the optical fiber 5 is connected to a spectral detector 7, and the spectral detector 7 spectrally detects the light transmitted by the optical fiber 5 and detects the light.

The light spectrally detected by the spectral detector 7 is converted into spectral analysis software 1 as spectral analysis means stored in a ROM (read only memory).
Display means 1 such as a CRT display
4 is displayed as an xy chromaticity diagram. And display means 1
The classification means 11 classifies the emission color of the LED based on the coordinate points of the emission color of the LED displayed on the xy chromaticity diagram of No. 4, and outputs the classification output means 12 based on the signal from the classification means 11.
Outputs a classification output and is displayed on the display means 14. 9 is spectrum analysis software 10,
Control means for controlling the classification means 11, the classification output means 12, and the display means 14. In addition, in FIG.
An LED power supply for causing the ED2 to emit light.

Next, the operation of the light emitting diode measuring and sorting apparatus 1 will be described. Light emitted from the LED 2 is captured by the optical fiber tip 3 and transmitted to the spectral detector 7 via the optical fiber 5. The spectral detector 7 spectrally detects the light transmitted by the optical fiber 5 and detects the light. The light separated and detected by the spectrum detector 7 is analyzed by the spectrum analysis software 10, and x is displayed on the display screen of the display unit 14.
Displayed as a y chromaticity diagram.

FIG. 2 shows x displayed on the display screen of the display means.
It is a figure which shows the division | segmentation of the system color of a light source color in a y chromaticity diagram. As shown in the drawing, the classification means 11 sets a necessary range for measuring and sorting the system color names of the light source colors on the xy chromaticity diagram by using multi-point xy coordinates, and classifies them. The difference between colors (for example, bright red, very light blue, etc.) that are considered by combining the hue and saturation, which are the attributes of, is displayed as different coordinate points on the diagram, and the system colors of the light source colors are displayed. Can be classified.

For example, an area A is located in a green portion of the xy coordinates.
Is set, and if this area A has a light source color coordinate point, the green LED is classified as a non-defective product, and if the other area has a light source color coordinate point, the green LED is
Can be classified as defective, and can be classified with colors closer to human vision than conventional LED classification.
In addition, since an optical filter is not used, there is no variation in an optical filter, a calibration error associated therewith, and variation between devices, and a single device can measure the entire visible light range of green, blue, red, yellow, white, and the like. Becomes possible.

In the above-described embodiment, the area A is set in the green portion. However, the present invention is not limited to this, and the respective areas may be set in other colors such as blue, red, yellow, and white. Of course. In the above-described embodiment, the CRT display is used as the display means. However, the present invention is not limited to this, and it goes without saying that another display such as a liquid crystal display may be used.

[0012]

As described above, according to the present invention,
The system color of the light source color on the xy chromaticity diagram is set and classified according to the multi-point xy coordinates by the classification means to classify the hue and saturation, which are attributes other than lightness and luminance. The color differences considered together are displayed as different coordinate points on the diagram, and the system colors of the light source colors can be classified and classified. It can be classified. Further, according to the present invention, since an optical filter is not used, there is no variation in the optical filter, a calibration error associated therewith, and variation among devices, and the reliability is high. , Yellow, white, etc., and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a system block diagram of an LED measuring and sorting apparatus according to the present invention.

FIG. 2 is a diagram showing divisions of system colors of light source colors in an xy chromaticity diagram displayed on a display screen of a display unit.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 light emitting diode measuring and sorting device 2 light emitting diode (LED) 3 optical fiber tip 5 optical fiber 6 fiber input optical system 7 spectral detector 9 control means 10 spectrum analysis software (spectrum analysis means) 11 classification means 12 classification output means 14 display means A area

Claims (1)

[Claims] A spectral detector for integrating light emitted from a light-emitting diode into a spectrometer and a photodetector; analyzing the light spectrally detected by the spectral detector; A spectrum analyzing means for displaying a diagram, and a classifying means for setting and classifying a range necessary for measurement selection by multi-point xy coordinates on a xy chromaticity diagram displayed on the xy chromaticity diagram displayed on the display means by the spectrum analyzing means. Control means for classifying the coordinates of the light emission color of the light emitting diode on the xy chromaticity diagram by the classifying means and performing control so that measurement and selection of the light emission color of the light emitting diode are possible. Characteristic light emitting diode measuring and sorting equipment.