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.
Highlights
For many years, active-matrix organic light-emitting diode (AMOLED) displays have been hot issues
We present an optimized OD technology combined with a dithering algorithm[12] for the AMOLED displays without modifying the conventional gamma architecture of the drivers
This paper has reported a severe response problem of the AMOLED displays
Summary
Active-matrix organic light-emitting diode (AMOLED) displays have been hot issues. Despite the advantages of AMOLED, there are still many limitations, such as the life time of devices, material cost, manufacturing issues, and nonuniform luminance due to characteristic variations of TFT and OLED.[2,3,4] In addition, the response characteristics of AMOLED displays are not always faster than LCDs. Yoon et al.[5] reported that slow rising responses are caused by back-plane circuitry and the driving scheme.[5] They proposed a source-follower type pixel circuit to improve the response characteristics of the AMOLED display. We verify that the proposed method can improve the response characteristics of AMOLED for all transitions
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