Pixel Driving Circuit Sampling Time Extension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face image quality defects such as stains, afterimages, and crosstalk due to insufficient sampling time, especially when trying to reduce the voltage of the source node of the driving transistor while maintaining a sufficient sampling period, particularly when a black signal is applied.
Innovation Solution
A pixel driving circuit is designed with a specific configuration including transistors and a storage capacitor, where the second scan signal is applied multiple times during a frame period to extend the sampling time and prevent light emission during black signal application, ensuring sufficient sampling and reducing the source node voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the sampling time is extended to improve image quality and reduce defects, then the sampling period is sufficient, but the voltage of the source node cannot be reduced when a black signal is applied
Solution Approach 1:
The patent applies the second scan signal multiple times during one frame period to preliminarily reduce the source node voltage before the emission period begins. This preliminary action ensures that when a black signal is applied, the voltage is already reduced, preventing unwanted light emission while maintaining a sufficient sampling period for image quality.
2Measurement precision
If the resolution and driving frequency are increased to improve display performance, then the sharpness of information is enhanced, but the sampling time becomes insufficient
Solution Approach 1:
The patent employs periodic application of the second scan signal multiple times during one frame period. This periodic action extends the effective sampling time by repeatedly applying the scan signal, ensuring sufficient sampling duration even when high resolution and driving frequency require shorter individual sampling intervals.
Data Source
AI summary
A display device can include a light emitting element, and a pixel driving circuit connected to the light emitting element and configured to include first to fourth nodes. The pixel driving circuit can include a driving transistor connected to the first to third nodes, a plurality of switching transistors, and a storage capacitor. Among the plurality of switching transistors, the switching transistor connected to a source node of the driving transistor is controlled by a second scan signal, and is configured to apply a data voltage to the source node of the driving transistor. The second scan signal can be applied one or more times during one frame.