Reflective Light-Emitting Element for End-Surface Emission
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Solution Overview
Problem
Existing light-emitting elements in display devices face challenges in maximizing light emission efficiency, particularly in directing light emitted from both end surfaces towards the display direction.
Innovation Solution
A light-emitting element design that includes a light-emitting element core with a reflective film surrounding the lateral surface of the device active layer, enhancing light emission towards both end surfaces and improving display efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective film is added to surround the lateral surface of the device active layer, then the amount of light emitted through both end surfaces is improved, but the device complexity increases
Solution Approach 1:
The reflective film converts light that would otherwise be lost through the lateral surface into useful light emitted through the end surfaces. By reflecting lateral-emitted light back into the light-emitting element core, the structure transforms a harmful light loss into a beneficial contribution to the overall light output, directly resolving the contradiction between improving illumination intensity and avoiding increased device complexity.
Solution Approach 2:
The light management function is segmented into different regions: the reflective film handles lateral surface light reflection, while the end surfaces handle light emission. This segmentation allows each component to be optimized independently, with the reflective film specifically targeting lateral light redirection without affecting the end surface emission structure, thus improving overall light output without proportionally increasing complexity.
2Use of energy by moving object
If the reflective film completely overlaps the lateral surface of the device active layer, then the light emission efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The reflective film is applied with specific local quality requirements: it must completely overlap the lateral surface of the device active layer to ensure full coverage and maximum light reflection efficiency. This localized precision requirement is concentrated only where needed (at the lateral surface interface) rather than requiring high precision throughout the entire device, thus achieving high light emission efficiency without uniformly increasing manufacturing precision demands across all components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design increases the amount of light emitted through both end surfaces of the light-emitting element, thereby enhancing the emission efficiency and display quality of the display device.
Implementation Method 1
a reflective film disposed on an outer lateral surface of the device insulating film and surrounding at least a lateral surface of the device active layer
Data Source
AI summary
A light-emitting element includes a light-emitting element core extending in a direction and including a first semiconductor layer, a second semiconductor layer disposed on the first semiconductor layer, and a device active layer disposed between the first semiconductor layer and the second semiconductor layer, a device insulating film surrounding a lateral surface of the light-emitting element core, and a reflective film disposed on an outer lateral surface of the device insulating film and surrounding at least a lateral surface of the device active layer.