研究目的
To establish to what extent luminance distribution is even on the examined COB LEDs and to observe the dependence of luminance distribution on changing the observation direction.
研究成果
The research concluded that luminance distribution on COB LED surfaces is not even, and the maximum luminance does not always occur in the geometric center. This irregularity needs to be considered when designing optical systems for COB LEDs.
研究不足
The study focused on six COB LEDs, which may not represent all available COB LEDs in the market. The influence of micro-LED arrangement and temperature distribution on luminance uniformity was noted, but further research is needed to fully understand these effects.
1：Experimental Design and Method Selection:
Direct measurements with a matrix luminance measuring device were made to verify luminance distributions on an LED surface.
2：Sample Selection and Data Sources:
Six COB LEDs of various producers were selected based on their popularity and wide availability.
3：List of Experimental Equipment and Materials:
A specially designed goniophotometer, a cooling system, the examined COB LEDs, lasers, micrometric screws, a temperature meter, a luminance and color measuring camera, and a stabilized DC power supply were used.
4：Experimental Procedures and Operational Workflow:
The COB LEDs were positioned using lasers and micrometric screws. Luminance measurements were conducted for different observation directions.
5：Data Analysis Methods:
The mean, maximum, and minimum luminance were determined for different areas of the COB LED surfaces.
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goniophotometer
Main element of the measurement setup, allowing the examination of COB LEDs in a (C, γ) system.
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cooling system
Specially designed to mount the examined COB LEDs and control their thermal conditions.
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temperature meter
Tes 1311A
TES Electrical Electronic Corp.
Used to control the thermal conditions of LEDs with 0.1 K resolution.
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thermocouple
TP 201
Czaki Thermo-Product
Coupled with the temperature meter to measure the temperature of the COB LEDs.
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DC power supply
Stabilized DC power supply
Unitra
Used to power the diodes during the measurements.
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luminance and color measuring camera
LMK98-3 Color
TechnoTeam Bildverarbeitung GmbH
Used for direct luminance measurements, mounted on the goniophotometer.
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measurement lens
TechnoTeam Bildverarbeitung GmbH
Selected for the luminance measuring device to project the COB LED image on the CCD matrix surface.
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multimeters
Used to control the electric parameters during the measurements.
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