Pixel Circuit Node Charging for High-Refresh Display Driving
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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 optimize charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high refresh rates are implemented in display products, then productivity is improved, but charging time becomes insufficient
Solution Approach 1:
The patent applies preliminary action by charging the first node in advance during the light emitting period before the compensation period begins. The node control sub-circuit is configured to charge the first node during periods when the light emitting device is emitting light, so that when the compensation period arrives and compensation voltage needs to be applied, the first node is already charged and ready, eliminating the need for extended charging time during the compensation period itself.
Solution Approach 2:
The patent implements periodic action by dividing the pixel circuit operation into distinct periodic phases: a light emitting period followed by a compensation period. During the light emitting period, the node control sub-circuit charges the first node. During the compensation period, compensation voltage is applied. This periodic switching allows the system to accumulate charge during one phase and utilize it during the next, enabling high refresh rates while maintaining adequate charging time through the cyclic reuse of the first node's stored charge.
2Reliability
If charging time is prolonged to ensure adequate pixel circuit operation, then reliability is improved, but refresh rate decreases
Solution Approach 1:
The patent ensures reliable pixel circuit operation by performing the charging action in advance during the light emitting period. The node control sub-circuit charges the first node before the compensation period begins, ensuring that adequate voltage is available when compensation is needed, thereby maintaining operational reliability without extending the total cycle time.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the first node is continuously charged during the light emitting period, which overlaps with or precedes the compensation period. This continuous charging ensures that the first node always has sufficient voltage to support compensation operations, maintaining reliable pixel circuit operation throughout the entire refresh cycle without idle periods or interruptions.
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 (N2) and a first power supply line (VDD) respectively, and is configured to charge the second node (N2) when a first scanning signal line (Gate1) is an effective level signal.