White Paper: Test & Measurement

How to Use Imaging Colorimeters to Correct OLED, MicroLED, and Other Emissive Displays for Improved Production Efficiency and Yields

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Emissive OLED, microLED (μLED), and miniLED are emerging as the next wave of displays. This is exciting because these technologies promise improved display performance and visual appearance with greater efficiency than traditional technologies like LCDs, thanks to their individually emissive pixel elements. As manufacturers work to launch commercially viable OLED and microLED displays, high costs due to manufacturing yield issues have hindered widespread technology adoption, most dramatically in large-format implementations.

The application of automated visual inspection in the production of OLED and microLED displays improves efficiency by ensuring visual quality of displays on the line. Further, scientific imaging tools for photometric and colorimetric measurement can be used to measure precise brightness and color values and determine variability at the pixel and subpixel level. An imaging colorimeter system is one very important component in manufacturing processes that boosts efficiency and yields in display production, contributing to global commercialization of these new display types for a range of applications.

Read this paper to learn about the manufacturing challenges associated with OLED, microLED, and other emissive display technologies, and the importance of visual quality inspection. This paper describes the role of automated visual inspection systems known as imaging colorimeters, which are used to capture images of displays in high-resolution, measure accurate pixel-level luminance values, and compare luminance uniformity from pixel to pixel.

Measured values are used to calculate correction factors that are applied in pixel uniformity correction (or “demura”) processes. These processes adjust the output of all pixels in the display, at all brightness levels, to achieve displays with completely uniform appearances, reducing rejection of poorly performing display materials and improving production yield.

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