Bidirectional Emission Driver Stage Circuit for OLED Signal Stability
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Solution Overview
Problem
Conventional organic light emitting display emission drivers face challenges in ensuring the stability of output signals and reliability due to complex configurations driven by multiple clock signals, leading to unstable low signal outputs.
Innovation Solution
A stage circuit and emission driver configuration using two clock signals to simplify the circuit design, with specific transistor and capacitor arrangements to control node voltages and output signals, ensuring stable low signal outputs by managing gate electrode voltages effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clock signals are used to drive the emission driver, then the emission control signal width can be adjusted, but the circuit complexity increases and output stability deteriorates
Solution Approach 1:
The emission driver is divided into multiple stage circuits (first stage, second stage, third stage, etc.), where each stage independently generates emission control signals for different scan line groups. This segmentation allows flexible control of emission timing for different pixel rows while maintaining simple individual stage designs, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The emission driver uses periodic clock signals (first clock signal and second clock signal with different phases) to sequentially activate different stage circuits. By controlling which stages are active during each horizontal period, the circuit achieves flexible emission signal width adjustment without requiring complex continuous control mechanisms.
2Adaptability or versatility
If multiple clock signals are used to drive the emission driver, then the emission control signal width can be adjusted, but the output stability of low signals deteriorates
Solution Approach 1:
By segmenting the emission driver into independent stage circuits, each stage maintains stable output characteristics. The segmentation isolates potential instability in one stage from affecting others, ensuring reliable low signal outputs while still providing overall system flexibility through selective stage activation.
Solution Approach 2:
The circuit prepares emission control signals in advance through the stage circuit configuration before they are needed for pixel emission control. This preliminary preparation ensures signal stability is established before the emission event occurs, maintaining reliability while allowing flexible timing control.
3Adaptability or versatility
If complex circuit configurations are used, then emission control functionality is enhanced, but manufacturing costs increase
Solution Approach 1:
The emission driver is segmented into multiple identical or similar stage circuits that can be independently manufactured and then assembled. This modular approach simplifies the manufacturing process compared to building a single complex circuit, as each stage can be produced using standardized processes and tested independently before final assembly.
Solution Approach 2:
Each stage circuit is designed with universal functionality to handle emission control for different scan line groups using the same basic circuit topology. This universality allows the same circuit design to be reused across multiple stages, reducing design and manufacturing complexity while maintaining enhanced emission control capabilities through the multi-stage configuration.
Data Source
AI summary
A stage circuit includes an output unit for outputting the voltage of a first or second power source to a first output terminal, corresponding to a voltage at a first or second node; a bidirectional driver for receiving sampling signals of previous and next stages; a first driver coupled to the bidirectional driver to control the voltages at the first and second nodes, corresponding to first and second clock signals; and a second driver coupled to the bidirectional driver to output a sampling signal corresponding to the first and second clock signals. The first driver includes a first transistor coupled between the first power source and the second node; a second transistor coupled between the second node and the second power source; a third transistor coupled between the bidirectional driver and the first node; and a first capacitor coupled between the second node and a second input terminal.