OLED Pixel Circuit Leakage Current Compensation Module
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Solution Overview
Problem
OLED display apparatuses experience unstable driving current due to leakage current in pixel circuits, leading to flickering issues during image display, affecting user experience.
Innovation Solution
A pixel circuit with a leakage current compensation module that outputs a compensation voltage to the gate of the driving transistor, counteracting potential changes caused by leakage current, ensuring stable potential and driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable frequency driving technology is applied to enhance display performance, then display adaptability is improved, but leakage current causes flickering and reduces display stability
Solution Approach 1:
The patent implements a feedback mechanism by introducing a leakage current compensation module that continuously monitors and compensates for gate voltage changes caused by leakage current. The module detects the potential change at the gate of the driving transistor and applies a compensating voltage to maintain stable driving current, thereby resolving the flickering issue while preserving variable frequency driving capabilities
Solution Approach 2:
The patent changes the electrical parameters of the pixel circuit by introducing a compensation voltage that dynamically adjusts the gate voltage of the driving transistor. This parameter adjustment counteracts the effect of leakage current, maintaining stable driving conditions across different driving frequencies and resolving the contradiction between adaptability and stability
2Ease of manufacture
If pixel circuit structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but leakage current compensation capability deteriorates
Solution Approach 1:
The leakage current compensation module is designed to work across different pixel circuit configurations and driving modes, providing universal compensation capability. The module can be integrated into existing pixel circuits without requiring complete restructuring, thus maintaining manufacturing simplicity while adding the necessary compensation function to ensure driving current stability
Data Source
AI summary
A pixel circuit, a driving method thereof, and a display apparatus are provided. The pixel circuit includes a leakage current compensation module, configured to output a leakage current compensation voltage to a gate of a driving transistor at a light-emitting control stage of the pixel circuit, to control a potential change of the gate of the driving transistor to be opposite to a potential change caused by a leakage current at the gate of the driving transistor. At the light-emitting stage, the voltage of the gate of the driving transistor is compensated for by the leakage current compensation module, to compensate for the potential change caused by the leakage current, ensuring high stability of potential at the gate of the driving transistor, making the driving current generated by the driving transistor highly stable, and alleviating the flickering problem when the display apparatus displays images.