Integrated LED Optical Surface for Narrow-Pitch Light Extraction
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Solution Overview
Problem
Existing light emitting devices, particularly those using microlens arrays, face challenges in narrowing the arrangement pitch of LEDs and achieving sufficient light extraction efficiency.
Innovation Solution
A light emitting apparatus with a first crystalline layer having an optical functional surface and an optical unit opposed to its light extraction surface, featuring structures like spherical or aspheric lenses, Fresnel lenses, or meta-lenses, to enhance light collection and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a microlens array is disposed with respect to an LED array, then light collection capability is improved, but the arrangement pitch of the LED cannot be narrowed
Solution Approach 1:
The patent merges the microlens structure directly with the LED chip by forming a lens layer integrated with the light emitting layer and electrode structure. This integration eliminates the need for separate microlens arrays, allowing the LED arrangement pitch to be narrowed while maintaining light collection capability through the combined structure.
Solution Approach 2:
The patent transitions from a planar microlens array configuration to a three-dimensional integrated structure where the lens layer is formed above and integrated with the LED chip layers. This dimensional change allows for narrower arrangement pitch by utilizing vertical space for optical functionality rather than requiring lateral separation.
2Illumination intensity
If a microlens array is disposed with respect to an LED array, then light orientation is controlled, but light extraction efficiency cannot be sufficiently improved
Solution Approach 1:
The patent combines the light emitting layer and lens layer into a single integrated structure, allowing simultaneous optimization of light generation and light extraction. The integrated design enables the lens to directly shape and extract light from the emission zone, improving extraction efficiency while maintaining orientation control.
Solution Approach 2:
The patent applies different refractive indices and optical properties to specific regions of the integrated structure, with the lens layer having optimized optical characteristics for light extraction. This local optimization of optical properties enables efficient light extraction from specific zones while maintaining overall orientation control.
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
Improves light extraction efficiency and allows for a narrower arrangement pitch of LEDs, enabling high-efficiency light delivery and collection, suitable for applications such as AR devices.
Implementation Method 1
at least a portion of a light extraction surface of the first crystalline layer being an optical functional surface, the optical functional surface having a light collecting effect
Implementation Method 2
an optical unit including at least one optical member having a light collecting effect, the optical unit being opposed to the light extraction surface side of the first light emitting unit
Data Source
AI summary
A light emitting apparatus of the present disclosure includes: a first light emitting unit including: a first crystalline layer provided on a light extraction surface side; a second crystalline layer; and a light emitting layer disposed between the first crystalline layer and the second crystalline layer, at least a portion of a light extraction surface of the first crystalline layer being an optical functional surface, the optical functional surface having a light collecting effect; and an optical unit including at least one optical member having a light collecting effect, the optical unit being opposed to the light extraction surface side of the first light emitting unit.