Oxide TFT Layer Layout for High-Density OLED Pixel Driving
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Solution Overview
Problem
Current display apparatuses face challenges in efficiently integrating a large number of thin film transistors in a limited area due to differences in properties between switching and driving transistors, which affect the high-density integration and performance of display devices.
Innovation Solution
A display apparatus is designed with thin film transistors having different s-factor values and operation properties, where the first thin film transistor with a small s-factor is used as a switching transistor and the second with a larger s-factor as a driving transistor, both integrated on different layers with oxide semiconductor materials, allowing for high-density integration and improved driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thin film transistors are integrated at high density in a limited area, then the productivity and performance of the display apparatus is improved, but the device complexity and manufacturing difficulty increase due to the need for different transistor types with different properties
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar arrangement to a three-dimensional stacked configuration. Multiple thin film transistors are arranged vertically across different layers (first layer, second layer, third layer) rather than only horizontally, enabling high-density integration while maintaining manageable complexity through systematic layering and standardized interconnections.
Solution Approach 2:
The patent implements nesting by placing transistor components within and across multiple layers. The first, second, and third thin film transistors are nested in a vertical stack, with each transistor occupying a specific layer and connecting to others through vertical interconnections, creating a compact nested structure that maximizes space utilization.
2Adaptability or versatility
If different types of thin film transistors (switching and driving) are integrated in the same display apparatus, then the operational performance is improved, but the manufacturing precision requirements increase due to different s-factor values and properties
Solution Approach 1:
The patent applies local quality by assigning different structural characteristics to different transistor types based on their functional requirements. The first thin film transistor (switching transistor) has specific layer configurations optimized for switching performance, while the second and third transistors (driving transistors) have different configurations optimized for driving performance, with each transistor's active layer, gate electrode, and insulating layer tailored to its local functional needs.
Solution Approach 2:
The patent segments the display apparatus into multiple functional units, each containing transistors with specific properties. By dividing the transistor network into distinct switching and driving transistor groups with different s-factor values and structural characteristics, the patent enables specialized optimization for each function while maintaining overall system integration.
Data Source
AI summary
Disclosed is a display apparatus including a first thin film transistor (TFT) and a second thin film transistor having a bottom gate structure and including an oxide semiconductor layer. The first TFT may be used as a switching device and the second TFT may be used as a driving device, and these TFTs have different operation properties from each other. One or more embodiments of the present disclosure provides a method of arranging a plurality of TFTs having different properties in a display apparatus. This not only provides a display apparatus with TFTs integrated at a high density but also an efficient way of driving the display apparatus.