Driving technology for improving motion quality of active-matrix organic light-emitting diode display

Abstract

Abstract. This paper reports transient response characteristics of active-matrix organic light emitting diode (AMOLED) displays for mobile applications. This work reports that the rising responses look like saw-tooth waveform and are not always faster than those of liquid crystal displays. Thus, a driving technology is proposed to improve the rising transient responses of AMOLED based on the overdrive (OD) technology. We modified the OD technology by combining it with a dithering method because the conventional OD method cannot successfully enhance all the rising responses. Our method can improve all the transitions of AMOLED without modifying the conventional gamma architecture of drivers. A new artifact is found when OD is applied to certain transitions. We propose an optimum OD selection method to mitigate the artifact. The implementation results show the proposed technology can successfully improve motion quality of scrolling texts as well as moving pictures in AMOLED displays.

Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes

“…Organic light-emitting diodes (OLEDs) are an important technology for attractive, high efficiency displays and lighting. New applications enabled by OLEDs include flexible 1 , wearable 2 , transparent 3 and high-resolution displays 4 , as well as efficient and high intensity illumination 5 . The primary impediment to large-scale commercialization of OLEDs, however, is the short operational lifetime of blue-emitting devices 6 .…”

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“…According to the simulation result, the V to between the R/G/B is different, and blue and red pixel is charging quickly in contrast to green, as a result it can be explained that the reason of the color motion blur because of emitting time difference. Even though the response time (motion blur) of the AMOLED display depends on the TFT hysteresis characteristics [42][43][44], in case of ultra-low brightness, the motion blur phenomenon depends on this explanation.…”

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