Scan Driver Stage Circuit for Concurrent and Progressive Scan Lines
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Solution Overview
Problem
Existing organic light emitting display technologies face challenges in concurrently or progressively supplying scan signals to multiple scan lines efficiently, which is essential for implementing the concurrent emission method, while maintaining a simple circuit design.
Innovation Solution
A stage circuit and scan driver design that incorporates progressive and concurrent drivers using transistors and capacitors to manage clock signals and control signals, allowing for simultaneous or progressive supply of scan signals to scan lines, with a focus on using two pulse signals to simplify the circuit implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional scan driver design is used, then the circuit structure is simple, but it cannot efficiently supply scan signals to multiple scan lines concurrently or progressively
Solution Approach 1:
The scan driver is divided into multiple stage circuits, where each stage circuit independently drives one scan line. Each stage circuit includes transistors and capacitors that are segmented to handle specific clock phases, allowing concurrent or progressive scan signal supply while maintaining manageable circuit complexity at each stage.
Solution Approach 2:
The circuit uses dynamic control through clock signals with different phases (first clock signal and second clock signal) to enable flexible switching between concurrent emission mode (all pixels emit simultaneously) and progressive emission mode (pixels emit sequentially). The transistors are dynamically controlled to connect or disconnect scan lines based on the emission mode required.
2Reliability
If concurrent emission method is implemented, then display performance is improved, but scan signal synchronization becomes more difficult
Solution Approach 1:
The circuit employs periodic clock signals with specific phase relationships to control the timing of scan signals. The first clock signal and second clock signal operate in periodic cycles with defined phase differences, enabling automatic synchronization of scan signals across multiple stages without complex control logic. This periodic action ensures reliable concurrent emission while simplifying synchronization through regular timing patterns.
Data Source
AI summary
A stage circuit and a scan driver using the same that is capable of concurrently (e.g., simultaneously) or progressively supplying a scan signal to a plurality of scan lines. The stage circuit includes a progressive driver and a concurrent driver.