Pixel Circuit Node Control for High-Refresh Charging Time
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Solution Overview
Problem
High refresh rates in display products lead to insufficient charging time in pixel circuits, resulting in poor display effects.
Innovation Solution
A pixel circuit design incorporating a node control sub-circuit, storage sub-circuit, driving sub-circuit, and light emitting control sub-circuit, with specific signal timing and electrical connections to manage node charging and drive current provision, including transistors and capacitors, to ensure adequate charging time under high refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high refresh rates are implemented in display products, then the display performance and responsiveness are improved, but the charging time in pixel circuits becomes insufficient resulting in poor display effects
Solution Approach 1:
The pixel circuit is divided into multiple functional sub-circuits including a node control sub-circuit, a storage sub-circuit, a driving sub-circuit, and a light emitting control sub-circuit. This segmentation allows independent optimization of each sub-circuit's function, particularly enabling the storage sub-circuit to extend charging time while the node control sub-circuit manages signal timing to support high refresh rates.
Solution Approach 2:
The storage sub-circuit performs preliminary charging of the second node before the light emitting phase, and the node control sub-circuit prepares signal timing in advance through coordinated control of initialization and scanning signals. This preliminary action ensures that adequate charging is completed before the shortened display period begins, resolving the contradiction between high refresh rates and sufficient charging time.
2Speed
If high refresh rates are maintained, then display responsiveness is improved, but image quality deteriorates due to insufficient charging time
Solution Approach 1:
By segmenting the pixel circuit into specialized sub-circuits, the storage sub-circuit can be dedicated to maintaining precise voltage levels and charging capacity, while the driving sub-circuit ensures accurate current delivery to the light emitting device. This functional segmentation preserves image quality metrics such as voltage stability and current precision even at high refresh rates.
Solution Approach 2:
The node control sub-circuit dynamically adjusts signal timing parameters including initialization signal duration and scanning signal phasing to optimize the balance between charging time and refresh rate. By changing these temporal parameters adaptively, the circuit maintains adequate charging for image quality while supporting high refresh rates.
Data Source
AI summary
A pixel circuit, a driving method therefor, a display substrate and a display apparatus, the pixel circuit includes a node control sub-circuit, a storage sub-circuit, a driving sub-circuit and a light emitting control sub-circuit; the storage sub-circuit is electrically connected to a second node and a first power supply line respectively, and is configured to charge the second node when a first scanning signal line is an effective level signal.