An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

A 6T1C pixel circuit based on low-temperature polycrystalline oxide (LTPO) technology for portable active-matrix organic light-emitting diode (AMOLED) display applications is proposed in this paper. For superior high-end portable applications including 4K high resolution and high PPI (pixels per inc...

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Bibliographic Details
Published in:Micromachines (Basel) 2023-09, Vol.14 (9), p.1785
Main Authors: Fan, Ching-Lin, Lin, Wei-Yu, Liu, Shih-Yang
Format: Article
Language:English
Subjects:
Active matrix displays
active-matrix organic light-emitting diode (AMOLED)
Circuit design
Communication
Compensation
Diodes
Displays (Marketing)
Light-emitting diodes
Low temperature
low-temperature polycrystalline oxide (LTPO)
mobility compensating
Negative feedback
Organic light emitting diodes
Pixels
Portability
Semiconductor devices
Technology application
Thin film transistors
Threshold voltage
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Summary:A 6T1C pixel circuit based on low-temperature polycrystalline oxide (LTPO) technology for portable active-matrix organic light-emitting diode (AMOLED) display applications is proposed in this paper. For superior high-end portable applications including 4K high resolution and high PPI (pixels per inch), the proposed pixel circuit employs a single storage capacitor and signal sharing switch-control design and provides low-voltage driving and immunity to the IR-drop issue and OLED degradation. Furthermore, the threshold voltage and mobility-compensating capabilities are improved by both compensation mechanisms, which are based on a negative feedback system, and mobility-related compensation parameters. Simulation results reveal that threshold voltage variations of ±0.33 V in the driving thin-film transistors can be well sensed and compensated while the maximum OLED current shift is 4.25%. The maximum variation in OLED currents within all gray levels is only 1.05% with mobility variations of ±30%. As a result, the proposed 6T1C pixel circuit is a good candidate for portable AMOLED display usage.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi14091785