OLEDs have primarily been known for burn-in effects. However, does image sticking also occur in TFTs?
The answer is yes. However, TFTs can recover with proper initialization.
Panel manufacturers' tests typically involve displaying a checkerboard pattern over various durations: 1 hour, 4 hours, and 24 hours. A medium gray tone is used for evaluation.
Using a TFT as an example, we can demonstrate that image sticking diminished after just 30 seconds following one hour of burn-in. After 4 hours of burn-in, image sticking disappeared within one minute. Following 24 hours of burn-in, it took four minutes for image sticking to subside.
The critical aspect is the assessment of burn-in. Evaluation is generally performed using a medium gray tone. However, we employ three additional tones for assessment, which allow burn-in effects to be observed significantly longer than with the standard gray tone.
Preventing Image Sticking
Given the described effects, we advise against displaying the same images, especially those with high contrast, for extended periods, as well as against using grayscale or light background colors. This applies even if the duration falls within the parameters specified by the manufacturer. A screensaver or disabling the display when not in use is always preferable.
However, should prolonged display durations be required due to the application area, please contact us during the development phase. We possess expertise in selecting suitable cells and optimizing the software.
