Display Panel Pixel Driver Circuit Flicker Reduction
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Solution Overview
Problem
The short scan pulse width in organic light-emitting display devices leads to undercharging of the drive transistor in the pixel driver circuit, causing flicker and brightness inconsistencies, especially at low gray scales, which are more noticeable due to insufficient charging time.
Innovation Solution
The implementation of multiple data write modules in the pixel driver circuit that provide data signals in a time-sharing manner before the light emission stage, ensuring sufficient charging of the drive transistor and reducing flicker by increasing the data writing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the scan pulse width is limited in the gate driver circuit, then the device complexity is reduced and the scanning speed is improved, but the data write stage becomes too short causing undercharging of the drive transistor gate
Solution Approach 1:
The data write stage is divided into multiple sub-stages (first data write sub-stage and second data write sub-stage), allowing the data signal to be written in sequential steps. This segmentation extends the total data write duration without increasing the scan pulse width, ensuring sufficient charging time for the drive transistor gate while maintaining fast scanning speed.
2Stability of the object's composition
If the data write stage is extended to fully charge the drive transistor gate, then the luminous brightness uniformity is improved, but the scanning speed decreases and the device complexity increases
Solution Approach 1:
The data write operation is segmented into multiple sub-stages that occur sequentially during the scan pulse period. This allows the data signal to be fully written into the drive transistor gate without extending the overall scan pulse width, thereby maintaining fast scanning speed while achieving uniform luminous brightness through complete charging.
Solution Approach 2:
The data writing process continues uninterrupted through multiple sub-stages within the scan pulse period, ensuring continuous charging of the drive transistor gate. This continuous action guarantees complete data writing and uniform brightness without requiring longer scan pulses that would reduce scanning speed.
3Reliability
If the data write stage is extended to fully charge the drive transistor gate, then the flicker perception is reduced, but the device complexity increases
Solution Approach 1:
The pixel driver circuit includes multiple data write modules (first and second data write modules) that operate in sequence. This segmentation allows complete data writing and flicker reduction without requiring additional complex circuitry, as the existing modules are utilized in a time-multiplexed manner throughout the scan pulse period.
Data Source
AI summary
A display panel and a driving method are provided. The pixel driver circuit includes a drive transistor, at least two data write modules, and a light emission control module. The at least two data write modules are configured to provide data signals for the drive transistor in a time-sharing manner, and the light emission control module is connected in series respectively with the drive transistor and the light-emitting element and is configured to control whether a drive current flows through the light-emitting element.