Pixel Driving Circuit Leakage Reduction via Segmented Transistor Topology
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Solution Overview
Problem
Display panels face issues due to gate electrode leakage in driving transistors, leading to display abnormalities.
Innovation Solution
The display panel incorporates a pixel driving circuit with additional transistors and conductive portions, where the gate electrode of the driving transistor is connected through a second transistor and a first transistor, reducing leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple pixel driving circuit with a single driving transistor is used, then the device complexity is low, but the gate electrode leakage causes display abnormalities
Solution Approach 1:
The pixel driving circuit is segmented into multiple functional modules: a first transistor for initialization, a second transistor for gate voltage control, and a driving transistor for light emission control. This segmentation allows each component to perform a specific function, reducing the leakage problem while maintaining manageable complexity
Solution Approach 2:
The second transistor acts as an intermediary between the gate electrode control and the driving transistor. It controls the gate voltage of the driving transistor, preventing direct leakage current from affecting the light-emitting unit, thus improving display stability
2Reliability
If additional transistors and conductive portions are added to reduce leakage current, then the leakage current is reduced, but the device complexity increases
Solution Approach 1:
The first transistor serves multiple functions: it initializes the gate electrode voltage and controls the initialization signal. The second transistor controls both the gate voltage of the driving transistor and the data signal input. This multi-functionality reduces the need for separate dedicated components, managing complexity while improving reliability
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a pixel driving circuit, a base substrate, a first reset signal line, a second gate line and a first conductive portion. The orthographic projection of the second gate line on the base substrate is located between the orthographic projection of the first reset signal line on the base substrate and an orthographic projection of the first conductive portion on the base substrate.