Pixel Circuit Phase Sequencing for Threshold Drift Compensation
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Solution Overview
Problem
Display panels suffer from display unevenness due to variations in threshold voltage drift of driver transistors, leading to poor display quality and brightness uniformity, which existing threshold compensation methods fail to fully address.
Innovation Solution
A pixel circuit design that separates threshold compensation and data writing phases, allowing for full compensation of driver module threshold voltage before data writing, using a compensation module and coupling module to manage voltage transitions, ensuring phases do not interfere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If threshold compensation and data writing are performed simultaneously, then the pixel circuit operation speed is improved, but the compensation precision deteriorates due to phase interference
Solution Approach 1:
The patent segments the pixel circuit operation into distinct phases: initialization phase, compensation phase, and data writing phase. By separating threshold compensation and data writing into different time slots, the patent eliminates phase interference while maintaining high operation speed. The compensation module operates independently during the compensation phase, ensuring precise threshold voltage compensation without interference from data writing operations.
2Measurement precision
If threshold compensation time is extended to improve compensation completeness, then the compensation precision is improved, but the refresh rate deteriorates
Solution Approach 1:
The patent performs threshold compensation in advance during the compensation phase, which occurs before the data writing phase. By completing the compensation operation preliminarily and independently, the patent ensures full compensation precision without extending the overall pixel circuit operation cycle. This preliminary action approach allows the refresh rate to maintain high speed while compensation completeness is achieved.
3Productivity
If data writing is performed before threshold compensation, then the pixel circuit efficiency is improved, but the display uniformity deteriorates due to incomplete compensation
Solution Approach 1:
The patent implements threshold compensation as a preliminary action before data writing occurs. The compensation phase is scheduled to complete the threshold voltage compensation operation before the data writing phase begins. This ensures that driver transistors are fully compensated with accurate threshold voltage values, guaranteeing display uniformity while maintaining pixel circuit efficiency through streamlined phase sequencing.
Data Source
AI summary
A pixel circuit and a driving method therefor, and a display panel are provided. The pixel circuit includes a driver module, a signal supply terminal, a compensation module, and a coupling module. The compensation module is configured to compensate for a threshold voltage of the driver module in a compensation phase. The signal supply terminal supplies a fixed voltage to the coupling module in an initialization phase and supplies a data voltage to the coupling module in a data writing phase, the coupling module is configured to couple a voltage containing information about the data voltage to a control terminal of the driver module via the compensation module in the data writing phase, where the data writing phase is later than the compensation phase.