This Standard specifies flicker measurement conditions andmethods for describing the visual perception in flicker for flexible display.

The flexible display shows green pattern of full screen.The measured conditions include the flat and the curved surface, and thecurvature of the curved surface is defined explicitly.

Flicker has been widely used for evaluating display. Followthe calculated procedures in VESA standard, the experimental results aretransformed to frequency-domain diagram by fast Fourier transformation (FFT),and further transformed to flicker value. However, the conventional method isapplied to a flat display and its local area only. To flexible displays, thepotential flicker phenomenon may present when the user operates the display ina flexible mode or a flat mode. Therefore, this Document also addresses thetest method for overall flicker of the flexible display.

Flicker is divided into local flicker and overall flicker,both of them are investigated for the flexible display. Overall flicker is thenew metric for evaluating the whole visual field of flickering on the flexibledisplay, such as concave or convex, foldable, stretchable form etc. It makes upthe deficiency of local flicker. The luminance meter with zoom lens isdeveloped for overall flicker. Local flicker and overall flicker are measuredfor evaluating the flicker of the specific field and the overall field on theflexible display, respectively. For reliable results, the calibrated proceduresof luminance meter are specifically described.

This Standard is applicable to the flexible display, excepton the transparent display.

This Standard includes flicker measurement, analysis andcalculated methods and equations.

The term ‘flicker’ is subject to evaluate displays (VESAFlat Panel Display Measurement Standard) in this Standard.

Referenced SEMI Standards (purchase separately)

None.

Revision History

SEMI D79-0421 (first published)