Sub-pixel Circuit Mitigating Body Effect in Display Devices
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Solution Overview
Problem
Display devices face challenges in mitigating the body effect, which leads to variations in the threshold voltage of transistors, affecting display quality.
Innovation Solution
The proposed solution involves a sub-pixel configuration that includes specific transistors and capacitors, with a field-effect transistor using a P-channel metal oxide semiconductor, to manage voltage levels and connections between nodes and power lines, thereby minimizing the body effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional transistor configurations are used in display devices, then device complexity is reduced, but threshold voltage variations occur due to the body effect, degrading display quality
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: a first transistor for driving the light emitting element, a second transistor for data input, a third transistor for node connection, and separate first and second capacitors for voltage storage. This segmentation allows each component to be optimized for its specific function, with the first transistor's source terminal connected to a dedicated first power line, isolating it from body effect interference while maintaining overall circuit functionality.
2Reliability
If the first transistor's source terminal is connected to a dedicated first power line, then body effect is mitigated and threshold voltage consistency is improved, but device complexity increases due to additional power lines and connections
Solution Approach 1:
The first transistor's source terminal is maintained at a constant potential by connecting it to the first power line, which provides a stable reference voltage. This equipotential connection eliminates voltage fluctuations at the source terminal that would otherwise cause body effect variations, ensuring consistent threshold voltage across different pixels and operating conditions.
Data Source
AI summary
Provided herein is a sub-pixel including first to seventh transistors, first and second capacitors, and a light emitting element, and a display device including the sub-pixel. A body terminal of the first transistor is connected to a first power line. In the sub-pixel and the display device including the sub-pixel in accordance with embodiments of the present disclosure, mitigation of the body effect may lead to an improvement in display quality.