Improving IR drop effect and power noise using digital OLED power in AMOLED display
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)...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-06-01
|
| Series: | Journal of Information Display |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/15980316.2025.2514844 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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. |
|---|---|
| ISSN: | 1598-0316 2158-1606 |