Measurement of OLED modules
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OLED modules become more and more important for years. They are planar light sources, may have a large geometry and a high efficiency. They are used in displays as well as in general lighting. In addition to electrical measurement technology, it is necessary to characterize these light sources optically during development and in production.
OLED modules are extended and homogeneous light sources. Therefore, they will be optically characterized by their Radiance and especially Luminance. These quantities are theoretically distance independent, so the measuring distance is not of critical importance. The measuring diameter needs to be adapted to the size of the emitting area.
The standard IEC 62341-6-1:2017 gives an overview about the “the standard measurement conditions and measuring methods for determining optical and electro-optical parameters of OLED display modules and, where specified, OLED display panels.”
At first it gives details of the standard measuring equipment and coordinate system, such as light measuring devices and viewing direction coordinate system, as well as measuring conditions, like environmental conditions, power supply, warm-up time, dark-room conditions and standard set-up conditions.
Then it lists the various measuring methods of image quality concerning the viewing angle range, cross-talk, i.e. the cross coupling of electrical signals between elements of an OLED display module, observable flicker, static image resolution and moving image resolution.“ [https://iecetech.org/In-Store/2017-01/New-edition-of-Standard-for-OLED-displays]
Further general information about OLED can be found here: https://www.fep.fraunhofer.de/content/dam/fep/en/documents/Service/K05_Service for OLED characterization_EN_net.pdf