Oxide Pixel Driver Structure for Mobility and Driving Range
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Solution Overview
Problem
Existing display panels face challenges in achieving high mobility in switching transistors and wide driving range in driving transistors, which affect the reliability of image representation.
Innovation Solution
The display panel incorporates a pixel driver with a first transistor and a second transistor, both made of oxide semiconductors with specific oxygen content and composition ratios, and a barrier layer made of metal, enhancing the mobility and driving range of the transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transistors are used in display panels, then manufacturing is simpler, but mobility and driving range are insufficient
Solution Approach 1:
The patent applies local quality by creating distinct semiconductor layers with different oxygen contents in specific regions of the transistor. The first semiconductor layer has a first oxygen content while the second semiconductor layer has a second oxygen content different from the first, allowing each layer to contribute different properties: one layer provides high mobility for switching characteristics while the other provides wide driving range for grayscale representation.
Solution Approach 2:
The patent employs composite materials by combining oxide semiconductor layers with different oxygen stoichiometries. The multi-layer oxide semiconductor structure integrates materials with varying oxygen contents to achieve both high mobility and wide driving range in a single transistor device, resolving the performance trade-off through material composition rather than separate devices.
2Reliability
If switching transistor prioritizes high mobility, then on-off characteristics improve, but driving range becomes limited
Solution Approach 1:
The patent resolves this contradiction by assigning different oxygen contents to different layers: the first oxide semiconductor layer with its specific oxygen content optimizes for high mobility and on-off characteristics, while the second oxide semiconductor layer with a different oxygen content optimizes for wide driving range, allowing both functions coexist in one transistor.
Solution Approach 2:
The patent merges the functions of separate switching and driving transistors into a single multi-layer oxide semiconductor transistor. By combining layers with different oxygen contents, the device integrates both high mobility (for switching) and wide driving range (for grayscale) capabilities in one component, eliminating the need for separate specialized transistors.
3Adaptability or versatility
If driving transistor prioritizes wide driving range, then grayscale representation improves, but mobility decreases
Solution Approach 1:
The patent addresses this by creating spatial variation in oxygen content within the transistor structure. The first oxide semiconductor layer with its specific oxygen composition provides high mobility for adequate switching performance, while the second oxide semiconductor layer with different oxygen content extends the driving range for grayscale representation, allowing both requirements to be met simultaneously.
Solution Approach 2:
The patent uses composite oxide semiconductor materials with different oxygen stoichiometries to resolve the mobility-driving range trade-off. The multi-layer structure combines materials optimized for different functions, where one layer contributes high mobility characteristics and the other contributes wide driving range, achieving both properties in a single driving transistor.
Data Source
AI summary
A display panel includes a substrate, a light emitting element disposed on the substrate, and a pixel driver connected to the light emitting element. The pixel driver includes a first transistor including a first-first semiconductor pattern, a second-first semiconductor pattern disposed on the first-first semiconductor pattern, and a barrier disposed between the first-first semiconductor pattern and the second-first semiconductor pattern and a second transistor including a first-second semiconductor pattern and a second-second semiconductor pattern disposed on the first-second semiconductor pattern.