A detection method and detection device for LED light spot symmetry
A detection method and a technology of a detection device, which are applied in measuring devices, optical instrument tests, and optical performance tests, can solve problems such as high cost, inability to realize LED rapid detection in industrial production lines, and long test time
Active Publication Date: 2022-01-21
GOERTEK OPTICAL TECH CO LTD
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However, these tests are generally limited to laboratory tests, and 3 to 5 samples are used for testing. The test time is long and the cost is high, and it is impossible to realize the rapid detection of LEDs in industrial production lines.
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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0024] A method for detecting LED light spot symmetry, comprising the following steps:
[0025] S1: if figure 1 As shown, the LED to be tested is fed with the first current, and the LED to be tested is photographed to obtain the first light spot picture, and the coordinates P1 (X1, Y1) of the center position of the first light spot are calculated;
[0026] S2: if figure 2 As shown, the LED to be tested is fed with a second current, and the second current value is greater than the first current value, and the LED to be tested is photographed to obtain a second light spot picture, and the center p...
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The invention discloses a detection method and a detection device for the symmetry of LED light spots. The detection method includes the following steps: S1, passing a first current into the LED to be tested, taking pictures of the LED to be tested, obtaining the first light spot picture, and calculating the The coordinates P1 of the central position of the first light spot; S2, pass the second current into the LED to be tested, take pictures of the LED to be tested, obtain the second light spot picture, and calculate the coordinates P2 of the central position of the second light spot; S3, compare The first coordinate P1 and the second coordinate P2 judge the symmetry of the LED light-emitting spot according to the numerical value of the X-coordinate axis and the Y-coordinate axis direction, and judge the up-down and left-right symmetry of the LED light-emitting spot according to whether the coordinates P1 and P2 are the same. Compared with the existing technology, by detecting the symmetry of LED light spots under different currents, it is simple and quick to judge the uniformity of LED light intensity distribution, and it is suitable for quickly detecting the light intensity distribution uniformity of LED light spots in industrial production lines.
Description
technical field [0001] The invention relates to the technical field of LED detection, in particular to a method and device for detecting the symmetry of LED light spots. Background technique [0002] Light-emitting diode (LED) is a semiconductor electronic component that converts electrical energy into light energy. It has been used as a mature electronic component in many aspects such as indicator lights, display panels, and lighting. The optical parameters of LED mainly include luminous flux, luminous efficiency, light intensity distribution, wavelength and so on. The laboratory detection methods of its various parameters are relatively mature, and the uniformity of the light intensity distribution of the spot can be detected by a distributed photometer to detect the distribution characteristics of the light intensity of the LED at different spatial angles. However, these tests are generally limited to laboratory tests, and 3 to 5 samples are used for testing. The test ti...
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IPC IPC(8): H01L21/66G01M11/02G01R31/26
CPCH01L22/10H01L22/24G01M11/0257G01R31/2635
Inventor 徐丹
Owner GOERTEK OPTICAL TECH CO LTD