Stage Circuit Layout for Progressive and Concurrent Scan Driving
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Solution Overview
Problem
Existing organic light emitting display technologies face challenges in concurrently or progressively supplying scan signals to scan lines efficiently, which is crucial for implementing concurrent emission methods in active matrix displays.
Innovation Solution
A stage circuit and scan driver design utilizing seven transistors and two capacitors, with specific transistor and capacitor configurations, allow for the concurrent or progressive supply of scan signals to scan lines, enabling efficient operation in both progressive and concurrent driving methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional scan driver design is used to supply scan signals to scan lines, then the circuit structure becomes complex, but the ability to concurrently or progressively supply scan signals is achieved
Solution Approach 1:
The stage circuit is designed with dual functionality to support both progressive emission mode (supplying scan signals sequentially to different scan lines) and concurrent emission mode (supplying scan signals simultaneously to multiple scan lines). The circuit achieves this versatility through configurable transistor switching that allows the same circuit to operate in different modes, eliminating the need for separate dedicated circuits for each mode and thereby reducing overall device complexity while maintaining adaptability.
Solution Approach 2:
The circuit employs dynamic control mechanisms where transistor switching states are adjusted based on the desired emission mode. Control signals dynamically reconfigure the circuit topology to enable progressive or concurrent signal supply. This dynamic reconfigurability allows the circuit to adapt its behavior without requiring multiple static circuit designs, thus reducing structural complexity while maintaining operational versatility.
2Device complexity
If a simple circuit structure is used, then the device complexity is reduced, but the reliability of scan signal supply may deteriorate
Solution Approach 1:
The circuit implements a nested structure where multiple transistor stages are arranged in a hierarchical configuration. The seven-transistor design features nested control mechanisms where inner transistors are controlled by outer control signals, creating a layered control architecture. This nested arrangement ensures that each signal path has redundant control points, enhancing reliability while maintaining a compact and relatively simple overall structure.
Solution Approach 2:
Different regions of the circuit are optimized for specific functions with localized quality enhancements. Critical signal paths incorporate additional control transistors and capacitors to ensure stable signal supply, while non-critical paths use simpler configurations. This localized optimization ensures high reliability in essential functions without unnecessarily increasing overall circuit complexity, achieving a balance between simplicity and stability.
Data Source
AI summary
A stage circuit includes a progressive driver and a concurrent driver, and a scan driver includes a plurality of stage circuits that are capable of supplying a scan signal to scan lines progressively and concurrently (e.g., simultaneously).