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Full color LED display photoelectric function detection method
With the continuous development of LED technology, high-power semiconductor lighting equipment has been rapidly developed in these years, especially the white light power and light efficiency continue to improve, LED gradually enters the lighting category. At present, LED full color screens are mainly divided into video screens, graphic screens and digital displays. For these different applications, how should we detect the photoelectric performance of LED full color display?
First, full color LED screen photoelectric function parameter analysis:
The primary parameters of the photoelectric color function include: total power of the lamp, power factor, light intensity distribution, total output luminous flux of the lamp, output light efficiency, lumen maintenance rate/light flux retention rate, correlated color temperature, color rendering index, color tolerance, color coordinate, color The space unevenness of the product.
Second, LED full color display photoelectric function indicators:
1. Electrical characteristics include: lamp power and power factor.
2. The thermal function includes heat resistance and junction temperature.
3, color features include: associated color temperature, color highlight index, chromaticity coordinates, chromaticity forgiveness, dominant wavelength (monochrome), uneven color dispersion uniformity and color space.
4. The characteristics of the day include the switching frequency test, the date/acceleration life test, the intracavity repair rate (light flux retention rate)/strength repair rate.
Third, full color LED screen photoelectric function detection method:
1. Reflective cup type MR16 or PAR beam viewpoint and light intensity can be measured by a small bedroom spread photometric measuring device. When tested, mechanical shaft, axial line. Defects are the abnormal working conditions of the test posture and the test results of the revised requirements.
2, the light of the LED light can also be used to measure the spread of the photometric measuring device, when the test gamma scale to 180 degrees, and the middle of the mechanical axis in the middle of the lamp. The flaw is that the exam time is too long.
Summary: Under the premise of the correct test method, the appropriate measurement method is selected to complete the accurate measurement of the photoelectric color function parameters of the full-color LED screen, and provide data support for the scientific evaluation of the current status and development trend of the function of the LED full-color screen.