Improving IR drop effect and power noise using digital OLED power in AMOLED display
Source abstract
Abstract
This research proposes a new digital organic light emitting diode (OLED) power structure aimed at mitigating the IR drop effect, which refers to a voltage drop caused by current and resistance in active-matrix organic light-emitting diode (AMOLED) displays, and reducing the alternating current (AC) ripple of OLED power, thereby minimizing screen noise. We implemented an OLED power system that includes a buck converter, a digital pulse width modulation (PWM) control algorithm, and a video sync generator to address these AMOLED issues. We employed a predictive control and IR drop compensation algorithm to supply power to the AMOLED, thus improving panel uniformity. The performance was validated on a commercial 5.5-inch full high definition (FHD) AMOLED panel. As a result, we reduced the AC ripple of OLED power from approximately 20 to 13 mV. Additionally, The panel uniformity was successfully improved using the ELVDD voltage-based IR drop optimization algorithm. Numerically the panel pixel deviation was reduced from 31 gray to 7 gray levels at the 50gray solid pattern.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Thin-Film Transistor Technologies · Organic Light-Emitting Diodes Research · Semiconductor Lasers and Optical Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
LG Display Co., Ltd
Yonsei University
Funding
National Research Foundation of Korea · Korea Institute for Advancement of Technology · Korea government
References (30)
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