OLED Driving Array Layout Using LTPS and Oxide Transistors
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Solution Overview
Problem
Existing display technologies face challenges in meeting the diverse requirements of transistor performance in circuit structures due to the use of identical transistors, limiting the freedom of component placement and functionality in the driving array layer of OLED display panels.
Innovation Solution
Incorporating transistors of different types, such as low-temperature poly-silicon and oxide semiconductors, along with capacitors with varying capacitances, into the driving array layer to satisfy specific performance needs and increase design flexibility, while optimizing the arrangement of their components within functional layers to enhance manufacturing efficiency and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all transistors in the driving array layer are of the same type, then the manufacturing process is simplified, but the ability to meet different performance requirements of individual transistors is reduced
Solution Approach 1:
The patent applies local quality by using different transistor types (silicon-based and oxide semiconductor-based) in different regions of the driving array layer. Specifically, silicon-based transistors are used where high switching speed is required, while oxide semiconductor-based transistors are used where low leakage current is critical. This allows each local region to have the transistor type best suited to its functional requirements, resolving the contradiction between manufacturing simplicity and performance adaptability.
2Adaptability or versatility
If transistors of different types are used in the driving array layer, then the freedom of setting components and meeting performance requirements is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent segments the driving array layer into distinct regions with different transistor types. The display device is divided into multiple pixel circuits, each containing transistors of different types arranged in specific configurations. This segmentation allows independent optimization of each region's performance characteristics while maintaining overall system functionality, thereby enabling design freedom without proportionally increasing overall manufacturing complexity.
3Manufacturing precision
If transistors of different types are incorporated into the driving array layer, then display resolution and optical performance can be improved, but the device structure becomes more complex
Solution Approach 1:
The patent utilizes parameter changes by exploiting the different electrical characteristics of silicon-based and oxide semiconductor-based transistors. Silicon-based transistors provide high switching speed with faster response times, while oxide semiconductor-based transistors provide ultra-low leakage currents. By strategically assigning transistor types based on their electrical parameters, the patent achieves high display resolution and optical performance through optimized current control and signal switching, without requiring excessive structural complexity.
Data Source
AI summary
Provided are a display panel and a display apparatus. The display panel includes a driving array layer having functional layers and insulation layers. The driving array layer includes a first transistor, a second transistor, a first capacitor including a first plate and a second plate, and a second capacitor including a third plate and a fourth plate. An active layer of the first transistor contains silicon, and an active layer of the second transistor contains oxide semiconductor. The first plate and the second plate are located in two of the functional layers, respectively, and the third plate and the fourth plate are located in two of the functional layers, respectively.