Abstract
While polarizer‐free (Pol‐less) OLED displays increase the efficiency of the panels with lowering the thickness, there comes an issue of the screen quality drop due to diffraction. We have investigated phenomena and invented a novel model for diffraction, since the color‐difference‐based evaluation alone has limitations in responding to customer needs in various environments and reflecting situations in which actual users embrace the screen quality. The main spatial features of the diffraction appearance were classified into the size and complexity of the pattern, and each factor was quantified through a specialized model. Diffraction features can be automatically calculated as numerical values from the invented model reflecting perceptual levels, which acts as a ‘ruler’ to achieve a good 'grade' of image quality in the product development stage. In this paper, we demonstrate what plays vital roles in diffraction appearance on Pol‐less displays and how to evaluate the diffraction in representative values.
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