Hybrid TFT Display Pixel Circuit for Low-Power Light Emission Control
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Solution Overview
Problem
Existing display apparatuses face challenges with high power consumption and integration issues due to the large number of thin-film transistors (TFTs) required for precise light emission control.
Innovation Solution
The display apparatus incorporates both TFTs with silicon semiconductors and TFTs with oxide semiconductors, along with a capacitor design that minimizes power consumption and enhances integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a significant number of TFTs are used to precisely control light emission, then light emission control precision is improved, but power consumption increases and integration becomes difficult
Solution Approach 1:
The patent applies different semiconductor materials to different functional regions: oxide semiconductor TFTs are used for switching elements requiring low leakage current, while silicon semiconductor TFTs are used for driving elements requiring high mobility. This local differentiation optimizes power consumption and integration without compromising light emission control precision.
Solution Approach 2:
The patent employs a hybrid architecture combining oxide semiconductor TFTs and silicon semiconductor TFTs within the same display device. This composite approach leverages the complementary strengths of both material systems to achieve precise control with reduced power consumption and improved integrability.
2Measurement precision
If a significant number of TFTs are used to precisely control light emission, then light emission control precision is improved, but device integration becomes difficult
Solution Approach 1:
By assigning oxide semiconductor TFTs to switching functions and silicon semiconductor TFTs to driving functions, the patent reduces the overall number of TFTs needed while maintaining precise control. This functional differentiation simplifies the device architecture and improves integration.
Solution Approach 2:
The patent designs TFTs to perform multiple functions where possible, such as using the same TFT structure for both switching and driving operations in different contexts, thereby reducing the total TFT count and improving integration without sacrificing control precision.
3Loss of energy
If oxide semiconductor TFTs are used, then leakage current is reduced and power consumption decreases, but manufacturing complexity increases
Solution Approach 1:
The patent segments the TFT population into two groups based on material type: oxide semiconductor TFTs for switching applications where low leakage is critical, and silicon semiconductor TFTs for driving applications where high mobility is critical. This segmentation allows each material type to be optimized for its specific function while simplifying the overall manufacturing process compared to using a single material for all functions.
Data Source
AI summary
A display apparatus may include a first transistor, a second transistor, and a capacitor. The first transistor includes a first semiconductor layer and a first gate electrode insulated from the first semiconductor layer. The first semiconductor layer includes a first silicon semiconductor. The second transistor includes a second semiconductor layer and a second gate electrode insulated from the second semiconductor layer. The second semiconductor layer includes a first oxide semiconductor. The capacitor includes a first electrode and a second electrode. The second electrode overlaps the first electrode and extends from the second semiconductor layer.