Matrix Light Emitting Element for Flexible Display Stress Management
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Solution Overview
Problem
Thin film LEDs in flexible displays are prone to breakage under great stress, even when the thickness of the LED on the base member is reduced, which limits the reliability of the flexible display.
Innovation Solution
A light emitting element with a Si substrate and a semiconductor layered body formed of nitride semiconductors, featuring a matrix arrangement of light emitting layers with regions absent of light emitting layers to attenuate stress, connected by wiring electrodes in series, parallel, or a combination of both, facilitating flexibility and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of the LED on the base member is reduced to improve flexibility, then the flexibility is improved, but the LED becomes more prone to breakage under stress
Solution Approach 1:
The light emitting element is divided into multiple light emitting layers arranged in a matrix pattern, with intermediate regions between the layers. This segmentation allows the structure to flex while distributing stress across multiple discrete layers rather than a continuous thin film, thereby maintaining flexibility while improving resistance to breakage.
Solution Approach 2:
The patent introduces regions without light emitting layers between the light emitting layers, creating areas with different mechanical properties. These intermediate regions can accommodate stress and deformation differently than the light emitting layers, allowing the overall structure to flex without causing breakage in the critical light emitting regions.
2Reliability
If the light emitting layers are arranged in a matrix pattern with regions absent between them, then the stress is distributed and reliability is improved, but the device complexity increases
Solution Approach 1:
The light emitting layers are segmented into a matrix arrangement with intentional gaps or intermediate regions between them. This segmentation simplifies the stress distribution mechanism compared to a continuous layer, while the regular matrix pattern maintains manufacturing simplicity through standardized fabrication processes.
Data Source
AI summary
A light emitting element includes: a Si substrate including: a first semiconductor layer, a plurality of light emitting layers arranged in a matrix on part of an upper surface of the first semiconductor layer, and a plurality of second semiconductor layers respectively disposed on upper surfaces of the light emitting layers; a first external connection part disposed on the Si substrate at a first end of the Si substrate in a longitudinal direction; a second external connection part disposed on the Si substrate at a second end of the Si substrate opposite to the first end in the longitudinal direction; and a plurality of wiring electrodes disposed on the Si substrate, the plurality of wiring electrodes including a first wiring electrode electrically connected to the first external connection part, and a second wiring electrode electrically connected to the second external connection part.