Display Device Partitioned Light Emitting Layer Waveguide Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in improving light extraction efficiency due to waveguide mode loss, which reduces luminance and lifespan, particularly in light emitting diode-based displays.
Innovation Solution
The display device incorporates a substrate with sub-pixels featuring a first electrode, a bank with an opening, a partition that divides the opening into multiple emission areas, and a light emitting layer and second electrode, where the light emitting layer is disconnected by the partition, reducing the waveguide mode loss and enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission area of sub-pixels is increased to improve luminance, then the light output is enhanced, but the waveguide mode loss increases which reduces light extraction efficiency
Solution Approach 1:
The emission area of each sub-pixel is divided into multiple separate emission regions by partitions, rather than using a single continuous emission area. This segmentation reduces the waveguide mode loss while maintaining the total emission area, thereby improving light extraction efficiency without sacrificing luminance output
Solution Approach 2:
Different regions within the sub-pixel emission area are structured differently through the introduction of partitions. The partitioned regions create localized optical environments that reduce waveguide mode confinement, allowing light to be extracted more efficiently from each local region while the overall luminance is maintained through the cumulative effect of all regions
2Ease of manufacture
If the light emitting layer is made continuous to simplify manufacturing, then the production process is easier, but the waveguide mode loss increases reducing light extraction efficiency
Solution Approach 1:
The light emitting layer is divided into multiple disconnected regions by partitions, creating a segmented structure that reduces waveguide mode loss. While this adds structural complexity, the partitions can be integrated into existing manufacturing processes, balancing the trade-off between manufacturing ease and optical performance
Solution Approach 2:
Partitions serve as intermediary structures that physically separate the light emitting layer into discrete regions. These partitions act as optical mediators that disrupt waveguide modes while allowing the overall device structure to maintain manufacturing feasibility through standardized fabrication techniques
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a substrate including a plurality of sub pixels; a first electrode on the substrate and corresponding to each of the plurality of sub pixels; a bank on the first electrode and including an opening which exposes the first electrode; a partition on the first electrode in the opening; a light emitting layer on the first electrode and the partition; and a second electrode on the light emitting layer, in which the light emitting layer is disposed to have a structure disconnected by the partition in the opening.