Pixel Circuit Leakage Reduction via Segmented Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pixel circuits suffer from significant leakage currents, which cause fluctuations in the gate voltage of the driving transistor, leading to flickers and poor display quality, especially at low-frequency driving.
Innovation Solution
The proposed pixel circuit includes a light emitting device, a driving transistor, a data signal write-in module, a compensation module, a first initialization module, and a light emitting control module. The compensation module is connected to the gate of the driving transistor and receives a second scan signal and a first power signal, reducing the number of leakage paths and stabilizing the voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit is used, then the circuit structure is simple, but leakage currents are serious causing gate voltage fluctuations and display quality degradation
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: a driving transistor for current control, a compensation module with first and second transistors for threshold voltage compensation, and an initialization module for voltage resetting. This segmentation allows each module to address specific issues (leakage, compensation, initialization) independently, improving overall reliability without creating a monolithic complex circuit.
Solution Approach 2:
The initialization module performs preliminary action by resetting the voltage level of the second electrode to a reference voltage before the light emitting phase. This preliminary voltage reset prevents accumulation of leakage effects and ensures stable gate voltage at the start of each frame, improving display quality without requiring complex real-time correction circuits.
2Reliability
If the number of transistors connected to the gate of the driving transistor is reduced, then leakage paths are reduced and gate voltage stability is improved, but the functionality of the circuit may be compromised
Solution Approach 1:
The compensation module extracts the threshold voltage compensation function from the main driving path. By using a separate second transistor specifically for compensation operations, the gate of the driving transistor is not continuously connected to multiple control signals. This extraction reduces leakage paths while maintaining all necessary functions through dedicated modular components.
Solution Approach 2:
The second transistor acts as an intermediary between the control signals and the driving transistor gate. It provides a controlled connection that enables compensation and initialization functions while isolating the driving transistor gate from direct continuous connections to multiple control lines, thereby reducing leakage paths while preserving circuit functionality.
Data Source
AI summary
Disclosed are a pixel circuit and a display panel. The pixel circuit includes a Light emitting device, a Data signal write-in module, a Driving transistor, a Compensation module, a First initialization module, and a Light emitting control module. The first initialization module is electrically connected to the compensation module and electrically connected to the gate of the driving transistor through the compensation module. When the voltage level of the gate of the driving transistor, the number of the transistors connected to the driving transistor could be reduced.