OLED Subpixel Segmentation for Defect Isolation and Brightness Maintenance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing process of organic light emitting diode (OLED) display devices is hindered by yield issues due to defects caused by residual impurities, leading to short circuits between anodes and cathodes, which can result in dark spots and reduced reliability, especially in large-size displays.
Innovation Solution
The OLED display panel design includes subpixel units with multiple light emitting regions connected to split output terminals, allowing for parallel operation, so that if one region becomes defective, the others can maintain image brightness by increasing current density, preventing deterioration and maintaining overall brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light emitting regions are connected to split output terminals in parallel, then reliability is improved by isolating defective areas, but device complexity increases due to additional circuit connections
Solution Approach 1:
The output terminal is divided into multiple sub-output terminals (first sub-output terminal and second sub-output terminal), which are then connected to different light emitting regions (first and second light emitting regions) in parallel. This segmentation allows defective regions to be isolated while maintaining functionality of other regions, thereby improving display reliability without requiring complete pixel replacement
Solution Approach 2:
Different light emitting regions are connected to different sub-output terminals, allowing local defects in one region to be isolated while other regions continue to function. The driving circuit can independently control each sub-output terminal, enabling localized maintenance of display quality without affecting the entire pixel unit
2Productivity
If multiple light emitting regions are used per subpixel unit, then yield is improved by compensating for defective spots, but manufacturing precision requirements increase
Solution Approach 1:
Each subpixel unit is divided into multiple light emitting regions (first and second light emitting regions) with substantially equal areas, connected to separate sub-output terminals. This segmentation allows the display to compensate for defective regions by isolating them through laser cutting, thereby improving manufacturing yield without requiring extremely high precision in single-region performance
Solution Approach 2:
The driving circuit is configured to adjust current density dynamically - when one light emitting region becomes defective, the driving circuit increases current density in the remaining functional regions to maintain overall brightness. This parameter adjustment compensates for manufacturing variations and defects, improving yield while maintaining acceptable display quality
Data Source
AI summary
Embodiments of the present disclosure relate to an organic light emitting diode display panel, a manufacturing method thereof, a maintenance method and a display device. The organic light emitting diode display panel includes a base substrate and a plurality of subpixel units disposed on the base substrate, wherein each of the subpixel units includes a driving circuit and at least two light emitting regions; in each of the subpixel units, a same output terminal of the driving circuit is split into at least two sub output terminals; and the at least two light emitting regions are respectively connected with different sub output terminals.