A digital driving method using pulse‐density modulation with a random dither matrix for higher motion image quality.

Autor: Usui, Takenobu, Nakajima, Yoshiki, Shiga, Tomokazu
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Zdroj: Journal of the Society for Information Display; Mar2022, Vol. 30 Issue 3, p198-208, 11p
Abstrakt: We propose a new digital driving technique using pulse‐density modulation (PDM) with a random dither matrix for evenness of luminance uniformity and higher motion image quality. As a digital driving technique, pulse‐width modulation (PWM) is conventionally used for active‐matrix organic light‐emitting diode (AMOLED) displays in order to improve luminance uniformity. However, in PWM driving, it is difficult to realize high‐frame‐rate driving for improving motion image quality. On the other hand, it is considered that PDM driving method is effective to obtain high motion image quality because of non‐frame‐refreshing property. In the present paper, we proposed a PDM driving technique using a random dither matrix and evaluated the relationship between the display image quality and the driving frequency in the proposed method through simulations. As a result, it is confirmed that good image quality can be obtained by using a blue‐noise mask as a random dither matrix at a practical driving frequency. Moreover, we demonstrated the proposed technique using an actual AMOLED panel. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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